xref: /vim-8.2.3635/src/quickfix.c (revision b477af22)
1 /* vi:set ts=8 sts=4 sw=4 noet:
2  *
3  * VIM - Vi IMproved	by Bram Moolenaar
4  *
5  * Do ":help uganda"  in Vim to read copying and usage conditions.
6  * Do ":help credits" in Vim to see a list of people who contributed.
7  * See README.txt for an overview of the Vim source code.
8  */
9 
10 /*
11  * quickfix.c: functions for quickfix mode, using a file with error messages
12  */
13 
14 #include "vim.h"
15 
16 #if defined(FEAT_QUICKFIX) || defined(PROTO)
17 
18 struct dir_stack_T
19 {
20     struct dir_stack_T	*next;
21     char_u		*dirname;
22 };
23 
24 /*
25  * For each error the next struct is allocated and linked in a list.
26  */
27 typedef struct qfline_S qfline_T;
28 struct qfline_S
29 {
30     qfline_T	*qf_next;	/* pointer to next error in the list */
31     qfline_T	*qf_prev;	/* pointer to previous error in the list */
32     linenr_T	qf_lnum;	/* line number where the error occurred */
33     int		qf_fnum;	/* file number for the line */
34     int		qf_col;		/* column where the error occurred */
35     int		qf_nr;		/* error number */
36     char_u	*qf_module;	/* module name for this error */
37     char_u	*qf_pattern;	/* search pattern for the error */
38     char_u	*qf_text;	/* description of the error */
39     char_u	qf_viscol;	/* set to TRUE if qf_col is screen column */
40     char_u	qf_cleared;	/* set to TRUE if line has been deleted */
41     char_u	qf_type;	/* type of the error (mostly 'E'); 1 for
42 				   :helpgrep */
43     char_u	qf_valid;	/* valid error message detected */
44 };
45 
46 /*
47  * There is a stack of error lists.
48  */
49 #define LISTCOUNT   10
50 #define INVALID_QFIDX (-1)
51 
52 /*
53  * Quickfix/Location list definition
54  * Contains a list of entries (qfline_T). qf_start points to the first entry
55  * and qf_last points to the last entry. qf_count contains the list size.
56  *
57  * Usually the list contains one or more entries. But an empty list can be
58  * created using setqflist()/setloclist() with a title and/or user context
59  * information and entries can be added later using setqflist()/setloclist().
60  */
61 typedef struct qf_list_S
62 {
63     int_u	qf_id;		/* Unique identifier for this list */
64     qfline_T	*qf_start;	/* pointer to the first error */
65     qfline_T	*qf_last;	/* pointer to the last error */
66     qfline_T	*qf_ptr;	/* pointer to the current error */
67     int		qf_count;	/* number of errors (0 means empty list) */
68     int		qf_index;	/* current index in the error list */
69     int		qf_nonevalid;	/* TRUE if not a single valid entry found */
70     char_u	*qf_title;	/* title derived from the command that created
71 				 * the error list or set by setqflist */
72     typval_T	*qf_ctx;	/* context set by setqflist/setloclist */
73 
74     struct dir_stack_T	*qf_dir_stack;
75     char_u		*qf_directory;
76     struct dir_stack_T	*qf_file_stack;
77     char_u		*qf_currfile;
78     int			qf_multiline;
79     int			qf_multiignore;
80     int			qf_multiscan;
81     long		qf_changedtick;
82 } qf_list_T;
83 
84 /*
85  * Quickfix/Location list stack definition
86  * Contains a list of quickfix/location lists (qf_list_T)
87  */
88 struct qf_info_S
89 {
90     /*
91      * Count of references to this list. Used only for location lists.
92      * When a location list window reference this list, qf_refcount
93      * will be 2. Otherwise, qf_refcount will be 1. When qf_refcount
94      * reaches 0, the list is freed.
95      */
96     int		qf_refcount;
97     int		qf_listcount;	    /* current number of lists */
98     int		qf_curlist;	    /* current error list */
99     qf_list_T	qf_lists[LISTCOUNT];
100 };
101 
102 static qf_info_T ql_info;	/* global quickfix list */
103 static int_u last_qf_id = 0;	/* Last used quickfix list id */
104 
105 #define FMT_PATTERNS 11		/* maximum number of % recognized */
106 
107 /*
108  * Structure used to hold the info of one part of 'errorformat'
109  */
110 typedef struct efm_S efm_T;
111 struct efm_S
112 {
113     regprog_T	    *prog;	/* pre-formatted part of 'errorformat' */
114     efm_T	    *next;	/* pointer to next (NULL if last) */
115     char_u	    addr[FMT_PATTERNS]; /* indices of used % patterns */
116     char_u	    prefix;	/* prefix of this format line: */
117 				/*   'D' enter directory */
118 				/*   'X' leave directory */
119 				/*   'A' start of multi-line message */
120 				/*   'E' error message */
121 				/*   'W' warning message */
122 				/*   'I' informational message */
123 				/*   'C' continuation line */
124 				/*   'Z' end of multi-line message */
125 				/*   'G' general, unspecific message */
126 				/*   'P' push file (partial) message */
127 				/*   'Q' pop/quit file (partial) message */
128 				/*   'O' overread (partial) message */
129     char_u	    flags;	/* additional flags given in prefix */
130 				/*   '-' do not include this line */
131 				/*   '+' include whole line in message */
132     int		    conthere;	/* %> used */
133 };
134 
135 static efm_T	*fmt_start = NULL; /* cached across qf_parse_line() calls */
136 
137 static void	qf_new_list(qf_info_T *qi, char_u *qf_title);
138 static int	qf_add_entry(qf_info_T *qi, int qf_idx, char_u *dir, char_u *fname, char_u *module, int bufnum, char_u *mesg, long lnum, int col, int vis_col, char_u *pattern, int nr, int type, int valid);
139 static void	qf_free(qf_info_T *qi, int idx);
140 static char_u	*qf_types(int, int);
141 static int	qf_get_fnum(qf_info_T *qi, int qf_idx, char_u *, char_u *);
142 static char_u	*qf_push_dir(char_u *, struct dir_stack_T **, int is_file_stack);
143 static char_u	*qf_pop_dir(struct dir_stack_T **);
144 static char_u	*qf_guess_filepath(qf_info_T *qi, int qf_idx, char_u *);
145 static void	qf_fmt_text(char_u *text, char_u *buf, int bufsize);
146 static int	qf_win_pos_update(qf_info_T *qi, int old_qf_index);
147 static win_T	*qf_find_win(qf_info_T *qi);
148 static buf_T	*qf_find_buf(qf_info_T *qi);
149 static void	qf_update_buffer(qf_info_T *qi, qfline_T *old_last);
150 static void	qf_set_title_var(qf_info_T *qi);
151 static void	qf_fill_buffer(qf_info_T *qi, buf_T *buf, qfline_T *old_last);
152 static char_u	*get_mef_name(void);
153 static buf_T	*load_dummy_buffer(char_u *fname, char_u *dirname_start, char_u *resulting_dir);
154 static void	wipe_dummy_buffer(buf_T *buf, char_u *dirname_start);
155 static void	unload_dummy_buffer(buf_T *buf, char_u *dirname_start);
156 static qf_info_T *ll_get_or_alloc_list(win_T *);
157 
158 /* Quickfix window check helper macro */
159 #define IS_QF_WINDOW(wp) (bt_quickfix(wp->w_buffer) && wp->w_llist_ref == NULL)
160 /* Location list window check helper macro */
161 #define IS_LL_WINDOW(wp) (bt_quickfix(wp->w_buffer) && wp->w_llist_ref != NULL)
162 /*
163  * Return location list for window 'wp'
164  * For location list window, return the referenced location list
165  */
166 #define GET_LOC_LIST(wp) (IS_LL_WINDOW(wp) ? wp->w_llist_ref : wp->w_llist)
167 
168 /*
169  * Looking up a buffer can be slow if there are many.  Remember the last one
170  * to make this a lot faster if there are multiple matches in the same file.
171  */
172 static char_u   *qf_last_bufname = NULL;
173 static bufref_T  qf_last_bufref = {NULL, 0, 0};
174 
175 static char	*e_loc_list_changed =
176 				 N_("E926: Current location list was changed");
177 
178 /*
179  * Maximum number of bytes allowed per line while reading a errorfile.
180  */
181 #define LINE_MAXLEN 4096
182 
183 static struct fmtpattern
184 {
185     char_u	convchar;
186     char	*pattern;
187 } fmt_pat[FMT_PATTERNS] =
188     {
189 	{'f', ".\\+"},	    /* only used when at end */
190 	{'n', "\\d\\+"},
191 	{'l', "\\d\\+"},
192 	{'c', "\\d\\+"},
193 	{'t', "."},
194 	{'m', ".\\+"},
195 	{'r', ".*"},
196 	{'p', "[- 	.]*"},
197 	{'v', "\\d\\+"},
198 	{'s', ".\\+"},
199 	{'o', ".\\+"}
200     };
201 
202 /*
203  * Convert an errorformat pattern to a regular expression pattern.
204  * See fmt_pat definition above for the list of supported patterns.
205  */
206     static char_u *
207 fmtpat_to_regpat(
208 	char_u	*efmp,
209 	efm_T	*fmt_ptr,
210 	int	idx,
211 	int	round,
212 	char_u	*ptr,
213 	char_u	*errmsg)
214 {
215     char_u	*srcptr;
216 
217     if (fmt_ptr->addr[idx])
218     {
219 	/* Each errorformat pattern can occur only once */
220 	sprintf((char *)errmsg,
221 		_("E372: Too many %%%c in format string"), *efmp);
222 	EMSG(errmsg);
223 	return NULL;
224     }
225     if ((idx && idx < 6
226 		&& vim_strchr((char_u *)"DXOPQ", fmt_ptr->prefix) != NULL)
227 	    || (idx == 6
228 		&& vim_strchr((char_u *)"OPQ", fmt_ptr->prefix) == NULL))
229     {
230 	sprintf((char *)errmsg,
231 		_("E373: Unexpected %%%c in format string"), *efmp);
232 	EMSG(errmsg);
233 	return NULL;
234     }
235     fmt_ptr->addr[idx] = (char_u)++round;
236     *ptr++ = '\\';
237     *ptr++ = '(';
238 #ifdef BACKSLASH_IN_FILENAME
239     if (*efmp == 'f')
240     {
241 	/* Also match "c:" in the file name, even when
242 	 * checking for a colon next: "%f:".
243 	 * "\%(\a:\)\=" */
244 	STRCPY(ptr, "\\%(\\a:\\)\\=");
245 	ptr += 10;
246     }
247 #endif
248     if (*efmp == 'f' && efmp[1] != NUL)
249     {
250 	if (efmp[1] != '\\' && efmp[1] != '%')
251 	{
252 	    /* A file name may contain spaces, but this isn't
253 	     * in "\f".  For "%f:%l:%m" there may be a ":" in
254 	     * the file name.  Use ".\{-1,}x" instead (x is
255 	     * the next character), the requirement that :999:
256 	     * follows should work. */
257 	    STRCPY(ptr, ".\\{-1,}");
258 	    ptr += 7;
259 	}
260 	else
261 	{
262 	    /* File name followed by '\\' or '%': include as
263 	     * many file name chars as possible. */
264 	    STRCPY(ptr, "\\f\\+");
265 	    ptr += 4;
266 	}
267     }
268     else
269     {
270 	srcptr = (char_u *)fmt_pat[idx].pattern;
271 	while ((*ptr = *srcptr++) != NUL)
272 	    ++ptr;
273     }
274     *ptr++ = '\\';
275     *ptr++ = ')';
276 
277     return ptr;
278 }
279 
280 /*
281  * Convert a scanf like format in 'errorformat' to a regular expression.
282  */
283     static char_u *
284 scanf_fmt_to_regpat(
285 	char_u	*efm,
286 	int	len,
287 	char_u	**pefmp,
288 	char_u	*ptr,
289 	char_u	*errmsg)
290 {
291     char_u	*efmp = *pefmp;
292 
293     if (*++efmp == '[' || *efmp == '\\')
294     {
295 	if ((*ptr++ = *efmp) == '[')	/* %*[^a-z0-9] etc. */
296 	{
297 	    if (efmp[1] == '^')
298 		*ptr++ = *++efmp;
299 	    if (efmp < efm + len)
300 	    {
301 		*ptr++ = *++efmp;	    /* could be ']' */
302 		while (efmp < efm + len
303 			&& (*ptr++ = *++efmp) != ']')
304 		    /* skip */;
305 		if (efmp == efm + len)
306 		{
307 		    EMSG(_("E374: Missing ] in format string"));
308 		    return NULL;
309 		}
310 	    }
311 	}
312 	else if (efmp < efm + len)	/* %*\D, %*\s etc. */
313 	    *ptr++ = *++efmp;
314 	*ptr++ = '\\';
315 	*ptr++ = '+';
316     }
317     else
318     {
319 	/* TODO: scanf()-like: %*ud, %*3c, %*f, ... ? */
320 	sprintf((char *)errmsg,
321 		_("E375: Unsupported %%%c in format string"), *efmp);
322 	EMSG(errmsg);
323 	return NULL;
324     }
325 
326     *pefmp = efmp;
327 
328     return ptr;
329 }
330 
331 /*
332  * Analyze/parse an errorformat prefix.
333  */
334     static int
335 efm_analyze_prefix(char_u **pefmp, efm_T *fmt_ptr, char_u *errmsg)
336 {
337     char_u	*efmp = *pefmp;
338 
339     if (vim_strchr((char_u *)"+-", *efmp) != NULL)
340 	fmt_ptr->flags = *efmp++;
341     if (vim_strchr((char_u *)"DXAEWICZGOPQ", *efmp) != NULL)
342 	fmt_ptr->prefix = *efmp;
343     else
344     {
345 	sprintf((char *)errmsg,
346 		_("E376: Invalid %%%c in format string prefix"), *efmp);
347 	EMSG(errmsg);
348 	return FAIL;
349     }
350 
351     *pefmp = efmp;
352 
353     return OK;
354 }
355 
356 /*
357  * Converts a 'errorformat' string to regular expression pattern
358  */
359     static int
360 efm_to_regpat(
361 	char_u	*efm,
362 	int	len,
363 	efm_T	*fmt_ptr,
364 	char_u	*regpat,
365 	char_u	*errmsg)
366 {
367     char_u	*ptr;
368     char_u	*efmp;
369     int		round;
370     int		idx = 0;
371 
372     /*
373      * Build regexp pattern from current 'errorformat' option
374      */
375     ptr = regpat;
376     *ptr++ = '^';
377     round = 0;
378     for (efmp = efm; efmp < efm + len; ++efmp)
379     {
380 	if (*efmp == '%')
381 	{
382 	    ++efmp;
383 	    for (idx = 0; idx < FMT_PATTERNS; ++idx)
384 		if (fmt_pat[idx].convchar == *efmp)
385 		    break;
386 	    if (idx < FMT_PATTERNS)
387 	    {
388 		ptr = fmtpat_to_regpat(efmp, fmt_ptr, idx, round, ptr,
389 								errmsg);
390 		if (ptr == NULL)
391 		    return -1;
392 		round++;
393 	    }
394 	    else if (*efmp == '*')
395 	    {
396 		ptr = scanf_fmt_to_regpat(efm, len, &efmp, ptr, errmsg);
397 		if (ptr == NULL)
398 		    return -1;
399 	    }
400 	    else if (vim_strchr((char_u *)"%\\.^$~[", *efmp) != NULL)
401 		*ptr++ = *efmp;		/* regexp magic characters */
402 	    else if (*efmp == '#')
403 		*ptr++ = '*';
404 	    else if (*efmp == '>')
405 		fmt_ptr->conthere = TRUE;
406 	    else if (efmp == efm + 1)		/* analyse prefix */
407 	    {
408 		if (efm_analyze_prefix(&efmp, fmt_ptr, errmsg) == FAIL)
409 		    return -1;
410 	    }
411 	    else
412 	    {
413 		sprintf((char *)errmsg,
414 			_("E377: Invalid %%%c in format string"), *efmp);
415 		EMSG(errmsg);
416 		return -1;
417 	    }
418 	}
419 	else			/* copy normal character */
420 	{
421 	    if (*efmp == '\\' && efmp + 1 < efm + len)
422 		++efmp;
423 	    else if (vim_strchr((char_u *)".*^$~[", *efmp) != NULL)
424 		*ptr++ = '\\';	/* escape regexp atoms */
425 	    if (*efmp)
426 		*ptr++ = *efmp;
427 	}
428     }
429     *ptr++ = '$';
430     *ptr = NUL;
431 
432     return 0;
433 }
434 
435     static void
436 free_efm_list(efm_T **efm_first)
437 {
438     efm_T *efm_ptr;
439 
440     for (efm_ptr = *efm_first; efm_ptr != NULL; efm_ptr = *efm_first)
441     {
442 	*efm_first = efm_ptr->next;
443 	vim_regfree(efm_ptr->prog);
444 	vim_free(efm_ptr);
445     }
446     fmt_start = NULL;
447 }
448 
449 /* Parse 'errorformat' option */
450     static efm_T *
451 parse_efm_option(char_u *efm)
452 {
453     char_u	*errmsg = NULL;
454     int		errmsglen;
455     efm_T	*fmt_ptr = NULL;
456     efm_T	*fmt_first = NULL;
457     efm_T	*fmt_last = NULL;
458     char_u	*fmtstr = NULL;
459     int		len;
460     int		i;
461     int		round;
462 
463     errmsglen = CMDBUFFSIZE + 1;
464     errmsg = alloc_id(errmsglen, aid_qf_errmsg);
465     if (errmsg == NULL)
466 	goto parse_efm_end;
467 
468     /*
469      * Each part of the format string is copied and modified from errorformat
470      * to regex prog.  Only a few % characters are allowed.
471      */
472 
473     /*
474      * Get some space to modify the format string into.
475      */
476     i = (FMT_PATTERNS * 3) + ((int)STRLEN(efm) << 2);
477     for (round = FMT_PATTERNS; round > 0; )
478 	i += (int)STRLEN(fmt_pat[--round].pattern);
479 #ifdef BACKSLASH_IN_FILENAME
480     i += 12; /* "%f" can become twelve chars longer (see efm_to_regpat) */
481 #else
482     i += 2; /* "%f" can become two chars longer */
483 #endif
484     if ((fmtstr = alloc(i)) == NULL)
485 	goto parse_efm_error;
486 
487     while (efm[0] != NUL)
488     {
489 	/*
490 	 * Allocate a new eformat structure and put it at the end of the list
491 	 */
492 	fmt_ptr = (efm_T *)alloc_clear((unsigned)sizeof(efm_T));
493 	if (fmt_ptr == NULL)
494 	    goto parse_efm_error;
495 	if (fmt_first == NULL)	    /* first one */
496 	    fmt_first = fmt_ptr;
497 	else
498 	    fmt_last->next = fmt_ptr;
499 	fmt_last = fmt_ptr;
500 
501 	/*
502 	 * Isolate one part in the 'errorformat' option
503 	 */
504 	for (len = 0; efm[len] != NUL && efm[len] != ','; ++len)
505 	    if (efm[len] == '\\' && efm[len + 1] != NUL)
506 		++len;
507 
508 	if (efm_to_regpat(efm, len, fmt_ptr, fmtstr, errmsg) == -1)
509 	    goto parse_efm_error;
510 	if ((fmt_ptr->prog = vim_regcomp(fmtstr, RE_MAGIC + RE_STRING)) == NULL)
511 	    goto parse_efm_error;
512 	/*
513 	 * Advance to next part
514 	 */
515 	efm = skip_to_option_part(efm + len);	/* skip comma and spaces */
516     }
517 
518     if (fmt_first == NULL)	/* nothing found */
519 	EMSG(_("E378: 'errorformat' contains no pattern"));
520 
521     goto parse_efm_end;
522 
523 parse_efm_error:
524     free_efm_list(&fmt_first);
525 
526 parse_efm_end:
527     vim_free(fmtstr);
528     vim_free(errmsg);
529 
530     return fmt_first;
531 }
532 
533 enum {
534     QF_FAIL = 0,
535     QF_OK = 1,
536     QF_END_OF_INPUT = 2,
537     QF_NOMEM = 3,
538     QF_IGNORE_LINE = 4,
539     QF_MULTISCAN = 5,
540 };
541 
542 typedef struct {
543     char_u	*linebuf;
544     int		linelen;
545     char_u	*growbuf;
546     int		growbufsiz;
547     FILE	*fd;
548     typval_T	*tv;
549     char_u	*p_str;
550     listitem_T	*p_li;
551     buf_T	*buf;
552     linenr_T	buflnum;
553     linenr_T	lnumlast;
554     vimconv_T	vc;
555 } qfstate_T;
556 
557     static char_u *
558 qf_grow_linebuf(qfstate_T *state, int newsz)
559 {
560     char_u	*p;
561 
562     /*
563      * If the line exceeds LINE_MAXLEN exclude the last
564      * byte since it's not a NL character.
565      */
566     state->linelen = newsz > LINE_MAXLEN ? LINE_MAXLEN - 1 : newsz;
567     if (state->growbuf == NULL)
568     {
569 	state->growbuf = alloc(state->linelen + 1);
570 	if (state->growbuf == NULL)
571 	    return NULL;
572 	state->growbufsiz = state->linelen;
573     }
574     else if (state->linelen > state->growbufsiz)
575     {
576 	if ((p = vim_realloc(state->growbuf, state->linelen + 1)) == NULL)
577 	    return NULL;
578 	state->growbuf = p;
579 	state->growbufsiz = state->linelen;
580     }
581     return state->growbuf;
582 }
583 
584 /*
585  * Get the next string (separated by newline) from state->p_str.
586  */
587     static int
588 qf_get_next_str_line(qfstate_T *state)
589 {
590     /* Get the next line from the supplied string */
591     char_u	*p_str = state->p_str;
592     char_u	*p;
593     int		len;
594 
595     if (*p_str == NUL) /* Reached the end of the string */
596 	return QF_END_OF_INPUT;
597 
598     p = vim_strchr(p_str, '\n');
599     if (p != NULL)
600 	len = (int)(p - p_str) + 1;
601     else
602 	len = (int)STRLEN(p_str);
603 
604     if (len > IOSIZE - 2)
605     {
606 	state->linebuf = qf_grow_linebuf(state, len);
607 	if (state->linebuf == NULL)
608 	    return QF_NOMEM;
609     }
610     else
611     {
612 	state->linebuf = IObuff;
613 	state->linelen = len;
614     }
615     vim_strncpy(state->linebuf, p_str, state->linelen);
616 
617     /*
618      * Increment using len in order to discard the rest of the
619      * line if it exceeds LINE_MAXLEN.
620      */
621     p_str += len;
622     state->p_str = p_str;
623 
624     return QF_OK;
625 }
626 
627 /*
628  * Get the next string from state->p_Li.
629  */
630     static int
631 qf_get_next_list_line(qfstate_T *state)
632 {
633     listitem_T	*p_li = state->p_li;
634     int		len;
635 
636     while (p_li != NULL
637 	    && (p_li->li_tv.v_type != VAR_STRING
638 		|| p_li->li_tv.vval.v_string == NULL))
639 	p_li = p_li->li_next;	/* Skip non-string items */
640 
641     if (p_li == NULL)		/* End of the list */
642     {
643 	state->p_li = NULL;
644 	return QF_END_OF_INPUT;
645     }
646 
647     len = (int)STRLEN(p_li->li_tv.vval.v_string);
648     if (len > IOSIZE - 2)
649     {
650 	state->linebuf = qf_grow_linebuf(state, len);
651 	if (state->linebuf == NULL)
652 	    return QF_NOMEM;
653     }
654     else
655     {
656 	state->linebuf = IObuff;
657 	state->linelen = len;
658     }
659 
660     vim_strncpy(state->linebuf, p_li->li_tv.vval.v_string, state->linelen);
661 
662     state->p_li = p_li->li_next;	/* next item */
663     return QF_OK;
664 }
665 
666 /*
667  * Get the next string from state->buf.
668  */
669     static int
670 qf_get_next_buf_line(qfstate_T *state)
671 {
672     char_u	*p_buf = NULL;
673     int		len;
674 
675     /* Get the next line from the supplied buffer */
676     if (state->buflnum > state->lnumlast)
677 	return QF_END_OF_INPUT;
678 
679     p_buf = ml_get_buf(state->buf, state->buflnum, FALSE);
680     state->buflnum += 1;
681 
682     len = (int)STRLEN(p_buf);
683     if (len > IOSIZE - 2)
684     {
685 	state->linebuf = qf_grow_linebuf(state, len);
686 	if (state->linebuf == NULL)
687 	    return QF_NOMEM;
688     }
689     else
690     {
691 	state->linebuf = IObuff;
692 	state->linelen = len;
693     }
694     vim_strncpy(state->linebuf, p_buf, state->linelen);
695 
696     return QF_OK;
697 }
698 
699 /*
700  * Get the next string from file state->fd.
701  */
702     static int
703 qf_get_next_file_line(qfstate_T *state)
704 {
705     int	    discard;
706     int	    growbuflen;
707 
708     if (fgets((char *)IObuff, IOSIZE, state->fd) == NULL)
709 	return QF_END_OF_INPUT;
710 
711     discard = FALSE;
712     state->linelen = (int)STRLEN(IObuff);
713     if (state->linelen == IOSIZE - 1 && !(IObuff[state->linelen - 1] == '\n'))
714     {
715 	/*
716 	 * The current line exceeds IObuff, continue reading using
717 	 * growbuf until EOL or LINE_MAXLEN bytes is read.
718 	 */
719 	if (state->growbuf == NULL)
720 	{
721 	    state->growbufsiz = 2 * (IOSIZE - 1);
722 	    state->growbuf = alloc(state->growbufsiz);
723 	    if (state->growbuf == NULL)
724 		return QF_NOMEM;
725 	}
726 
727 	/* Copy the read part of the line, excluding null-terminator */
728 	memcpy(state->growbuf, IObuff, IOSIZE - 1);
729 	growbuflen = state->linelen;
730 
731 	for (;;)
732 	{
733 	    char_u	*p;
734 
735 	    if (fgets((char *)state->growbuf + growbuflen,
736 			state->growbufsiz - growbuflen, state->fd) == NULL)
737 		break;
738 	    state->linelen = (int)STRLEN(state->growbuf + growbuflen);
739 	    growbuflen += state->linelen;
740 	    if ((state->growbuf)[growbuflen - 1] == '\n')
741 		break;
742 	    if (state->growbufsiz == LINE_MAXLEN)
743 	    {
744 		discard = TRUE;
745 		break;
746 	    }
747 
748 	    state->growbufsiz = 2 * state->growbufsiz < LINE_MAXLEN
749 		? 2 * state->growbufsiz : LINE_MAXLEN;
750 	    if ((p = vim_realloc(state->growbuf, state->growbufsiz)) == NULL)
751 		return QF_NOMEM;
752 	    state->growbuf = p;
753 	}
754 
755 	while (discard)
756 	{
757 	    /*
758 	     * The current line is longer than LINE_MAXLEN, continue
759 	     * reading but discard everything until EOL or EOF is
760 	     * reached.
761 	     */
762 	    if (fgets((char *)IObuff, IOSIZE, state->fd) == NULL
763 		    || (int)STRLEN(IObuff) < IOSIZE - 1
764 		    || IObuff[IOSIZE - 1] == '\n')
765 		break;
766 	}
767 
768 	state->linebuf = state->growbuf;
769 	state->linelen = growbuflen;
770     }
771     else
772 	state->linebuf = IObuff;
773 
774 #ifdef FEAT_MBYTE
775     /* Convert a line if it contains a non-ASCII character. */
776     if (state->vc.vc_type != CONV_NONE && has_non_ascii(state->linebuf))
777     {
778 	char_u	*line;
779 
780 	line = string_convert(&state->vc, state->linebuf, &state->linelen);
781 	if (line != NULL)
782 	{
783 	    if (state->linelen < IOSIZE)
784 	    {
785 		STRCPY(state->linebuf, line);
786 		vim_free(line);
787 	    }
788 	    else
789 	    {
790 		vim_free(state->growbuf);
791 		state->linebuf = state->growbuf = line;
792 		state->growbufsiz = state->linelen < LINE_MAXLEN
793 						? state->linelen : LINE_MAXLEN;
794 	    }
795 	}
796     }
797 #endif
798 
799     return QF_OK;
800 }
801 
802 /*
803  * Get the next string from a file/buffer/list/string.
804  */
805     static int
806 qf_get_nextline(qfstate_T *state)
807 {
808     int status = QF_FAIL;
809 
810     if (state->fd == NULL)
811     {
812 	if (state->tv != NULL)
813 	{
814 	    if (state->tv->v_type == VAR_STRING)
815 		/* Get the next line from the supplied string */
816 		status = qf_get_next_str_line(state);
817 	    else if (state->tv->v_type == VAR_LIST)
818 		/* Get the next line from the supplied list */
819 		status = qf_get_next_list_line(state);
820 	}
821 	else
822 	    /* Get the next line from the supplied buffer */
823 	    status = qf_get_next_buf_line(state);
824     }
825     else
826 	/* Get the next line from the supplied file */
827 	status = qf_get_next_file_line(state);
828 
829     if (status != QF_OK)
830 	return status;
831 
832     /* remove newline/CR from the line */
833     if (state->linelen > 0 && state->linebuf[state->linelen - 1] == '\n')
834     {
835 	state->linebuf[state->linelen - 1] = NUL;
836 #ifdef USE_CRNL
837 	if (state->linelen > 1 && state->linebuf[state->linelen - 2] == '\r')
838 	    state->linebuf[state->linelen - 2] = NUL;
839 #endif
840     }
841 
842 #ifdef FEAT_MBYTE
843     remove_bom(state->linebuf);
844 #endif
845 
846     return QF_OK;
847 }
848 
849 typedef struct {
850     char_u	*namebuf;
851     char_u	*module;
852     char_u	*errmsg;
853     int		errmsglen;
854     long	lnum;
855     int		col;
856     char_u	use_viscol;
857     char_u	*pattern;
858     int		enr;
859     int		type;
860     int		valid;
861 } qffields_T;
862 
863 /*
864  * Parse the error format matches in 'regmatch' and set the values in 'fields'.
865  * fmt_ptr contains the 'efm' format specifiers/prefixes that have a match.
866  * Returns QF_OK if all the matches are successfully parsed. On failure,
867  * returns QF_FAIL or QF_NOMEM.
868  */
869     static int
870 qf_parse_match(
871 	char_u		*linebuf,
872 	int		linelen,
873 	efm_T		*fmt_ptr,
874 	regmatch_T	*regmatch,
875 	qffields_T	*fields,
876 	int		qf_multiline,
877 	int		qf_multiscan,
878 	char_u		**tail)
879 {
880     char_u	*p;
881     int		idx = fmt_ptr->prefix;
882     int		i;
883     int		len;
884 
885     if ((idx == 'C' || idx == 'Z') && !qf_multiline)
886 	return QF_FAIL;
887     if (vim_strchr((char_u *)"EWI", idx) != NULL)
888 	fields->type = idx;
889     else
890 	fields->type = 0;
891     /*
892      * Extract error message data from matched line.
893      * We check for an actual submatch, because "\[" and "\]" in
894      * the 'errorformat' may cause the wrong submatch to be used.
895      */
896     if ((i = (int)fmt_ptr->addr[0]) > 0)		/* %f */
897     {
898 	int c;
899 
900 	if (regmatch->startp[i] == NULL || regmatch->endp[i] == NULL)
901 	    return QF_FAIL;
902 
903 	/* Expand ~/file and $HOME/file to full path. */
904 	c = *regmatch->endp[i];
905 	*regmatch->endp[i] = NUL;
906 	expand_env(regmatch->startp[i], fields->namebuf, CMDBUFFSIZE);
907 	*regmatch->endp[i] = c;
908 
909 	if (vim_strchr((char_u *)"OPQ", idx) != NULL
910 		&& mch_getperm(fields->namebuf) == -1)
911 	    return QF_FAIL;
912     }
913     if ((i = (int)fmt_ptr->addr[1]) > 0)		/* %n */
914     {
915 	if (regmatch->startp[i] == NULL)
916 	    return QF_FAIL;
917 	fields->enr = (int)atol((char *)regmatch->startp[i]);
918     }
919     if ((i = (int)fmt_ptr->addr[2]) > 0)		/* %l */
920     {
921 	if (regmatch->startp[i] == NULL)
922 	    return QF_FAIL;
923 	fields->lnum = atol((char *)regmatch->startp[i]);
924     }
925     if ((i = (int)fmt_ptr->addr[3]) > 0)		/* %c */
926     {
927 	if (regmatch->startp[i] == NULL)
928 	    return QF_FAIL;
929 	fields->col = (int)atol((char *)regmatch->startp[i]);
930     }
931     if ((i = (int)fmt_ptr->addr[4]) > 0)		/* %t */
932     {
933 	if (regmatch->startp[i] == NULL)
934 	    return QF_FAIL;
935 	fields->type = *regmatch->startp[i];
936     }
937     if (fmt_ptr->flags == '+' && !qf_multiscan)	/* %+ */
938     {
939 	if (linelen >= fields->errmsglen)
940 	{
941 	    /* linelen + null terminator */
942 	    if ((p = vim_realloc(fields->errmsg, linelen + 1)) == NULL)
943 		return QF_NOMEM;
944 	    fields->errmsg = p;
945 	    fields->errmsglen = linelen + 1;
946 	}
947 	vim_strncpy(fields->errmsg, linebuf, linelen);
948     }
949     else if ((i = (int)fmt_ptr->addr[5]) > 0)	/* %m */
950     {
951 	if (regmatch->startp[i] == NULL || regmatch->endp[i] == NULL)
952 	    return QF_FAIL;
953 	len = (int)(regmatch->endp[i] - regmatch->startp[i]);
954 	if (len >= fields->errmsglen)
955 	{
956 	    /* len + null terminator */
957 	    if ((p = vim_realloc(fields->errmsg, len + 1)) == NULL)
958 		return QF_NOMEM;
959 	    fields->errmsg = p;
960 	    fields->errmsglen = len + 1;
961 	}
962 	vim_strncpy(fields->errmsg, regmatch->startp[i], len);
963     }
964     if ((i = (int)fmt_ptr->addr[6]) > 0)		/* %r */
965     {
966 	if (regmatch->startp[i] == NULL)
967 	    return QF_FAIL;
968 	*tail = regmatch->startp[i];
969     }
970     if ((i = (int)fmt_ptr->addr[7]) > 0)		/* %p */
971     {
972 	char_u	*match_ptr;
973 
974 	if (regmatch->startp[i] == NULL || regmatch->endp[i] == NULL)
975 	    return QF_FAIL;
976 	fields->col = 0;
977 	for (match_ptr = regmatch->startp[i];
978 		match_ptr != regmatch->endp[i]; ++match_ptr)
979 	{
980 	    ++fields->col;
981 	    if (*match_ptr == TAB)
982 	    {
983 		fields->col += 7;
984 		fields->col -= fields->col % 8;
985 	    }
986 	}
987 	++fields->col;
988 	fields->use_viscol = TRUE;
989     }
990     if ((i = (int)fmt_ptr->addr[8]) > 0)		/* %v */
991     {
992 	if (regmatch->startp[i] == NULL)
993 	    return QF_FAIL;
994 	fields->col = (int)atol((char *)regmatch->startp[i]);
995 	fields->use_viscol = TRUE;
996     }
997     if ((i = (int)fmt_ptr->addr[9]) > 0)		/* %s */
998     {
999 	if (regmatch->startp[i] == NULL || regmatch->endp[i] == NULL)
1000 	    return QF_FAIL;
1001 	len = (int)(regmatch->endp[i] - regmatch->startp[i]);
1002 	if (len > CMDBUFFSIZE - 5)
1003 	    len = CMDBUFFSIZE - 5;
1004 	STRCPY(fields->pattern, "^\\V");
1005 	STRNCAT(fields->pattern, regmatch->startp[i], len);
1006 	fields->pattern[len + 3] = '\\';
1007 	fields->pattern[len + 4] = '$';
1008 	fields->pattern[len + 5] = NUL;
1009     }
1010     if ((i = (int)fmt_ptr->addr[10]) > 0)		/* %o */
1011     {
1012 	if (regmatch->startp[i] == NULL || regmatch->endp[i] == NULL)
1013 	    return QF_FAIL;
1014 	len = (int)(regmatch->endp[i] - regmatch->startp[i]);
1015 	if (len > CMDBUFFSIZE)
1016 	    len = CMDBUFFSIZE;
1017 	STRNCAT(fields->module, regmatch->startp[i], len);
1018     }
1019 
1020     return QF_OK;
1021 }
1022 
1023 /*
1024  * Parse an error line in 'linebuf' using a single error format string in
1025  * 'fmt_ptr->prog' and return the matching values in 'fields'.
1026  * Returns QF_OK if the efm format matches completely and the fields are
1027  * successfully copied. Otherwise returns QF_FAIL or QF_NOMEM.
1028  */
1029     static int
1030 qf_parse_get_fields(
1031 	char_u		*linebuf,
1032 	int		linelen,
1033 	efm_T		*fmt_ptr,
1034 	qffields_T	*fields,
1035 	int		qf_multiline,
1036 	int		qf_multiscan,
1037 	char_u		**tail)
1038 {
1039     regmatch_T	regmatch;
1040     int		status = QF_FAIL;
1041     int		r;
1042 
1043     if (qf_multiscan &&
1044 		vim_strchr((char_u *)"OPQ", fmt_ptr->prefix) == NULL)
1045 	return QF_FAIL;
1046 
1047     fields->namebuf[0] = NUL;
1048     fields->module[0] = NUL;
1049     fields->pattern[0] = NUL;
1050     if (!qf_multiscan)
1051 	fields->errmsg[0] = NUL;
1052     fields->lnum = 0;
1053     fields->col = 0;
1054     fields->use_viscol = FALSE;
1055     fields->enr = -1;
1056     fields->type = 0;
1057     *tail = NULL;
1058 
1059     /* Always ignore case when looking for a matching error. */
1060     regmatch.rm_ic = TRUE;
1061     regmatch.regprog = fmt_ptr->prog;
1062     r = vim_regexec(&regmatch, linebuf, (colnr_T)0);
1063     fmt_ptr->prog = regmatch.regprog;
1064     if (r)
1065 	status = qf_parse_match(linebuf, linelen, fmt_ptr, &regmatch,
1066 		fields, qf_multiline, qf_multiscan, tail);
1067 
1068     return status;
1069 }
1070 
1071 /*
1072  * Parse directory error format prefixes (%D and %X).
1073  * Push and pop directories from the directory stack when scanning directory
1074  * names.
1075  */
1076     static int
1077 qf_parse_dir_pfx(int idx, qffields_T *fields, qf_list_T *qfl)
1078 {
1079     if (idx == 'D')				/* enter directory */
1080     {
1081 	if (*fields->namebuf == NUL)
1082 	{
1083 	    EMSG(_("E379: Missing or empty directory name"));
1084 	    return QF_FAIL;
1085 	}
1086 	qfl->qf_directory =
1087 	    qf_push_dir(fields->namebuf, &qfl->qf_dir_stack, FALSE);
1088 	if (qfl->qf_directory == NULL)
1089 	    return QF_FAIL;
1090     }
1091     else if (idx == 'X')			/* leave directory */
1092 	qfl->qf_directory = qf_pop_dir(&qfl->qf_dir_stack);
1093 
1094     return QF_OK;
1095 }
1096 
1097 /*
1098  * Parse global file name error format prefixes (%O, %P and %Q).
1099  */
1100     static int
1101 qf_parse_file_pfx(
1102 	int idx,
1103 	qffields_T *fields,
1104 	qf_list_T *qfl,
1105 	char_u *tail)
1106 {
1107     fields->valid = FALSE;
1108     if (*fields->namebuf == NUL || mch_getperm(fields->namebuf) >= 0)
1109     {
1110 	if (*fields->namebuf && idx == 'P')
1111 	    qfl->qf_currfile =
1112 		qf_push_dir(fields->namebuf, &qfl->qf_file_stack, TRUE);
1113 	else if (idx == 'Q')
1114 	    qfl->qf_currfile = qf_pop_dir(&qfl->qf_file_stack);
1115 	*fields->namebuf = NUL;
1116 	if (tail && *tail)
1117 	{
1118 	    STRMOVE(IObuff, skipwhite(tail));
1119 	    qfl->qf_multiscan = TRUE;
1120 	    return QF_MULTISCAN;
1121 	}
1122     }
1123 
1124     return QF_OK;
1125 }
1126 
1127 /*
1128  * Parse a non-error line (a line which doesn't match any of the error
1129  * format in 'efm').
1130  */
1131     static int
1132 qf_parse_line_nomatch(char_u *linebuf, int linelen, qffields_T *fields)
1133 {
1134     char_u	*p;
1135 
1136     fields->namebuf[0] = NUL;	/* no match found, remove file name */
1137     fields->lnum = 0;			/* don't jump to this line */
1138     fields->valid = FALSE;
1139     if (linelen >= fields->errmsglen)
1140     {
1141 	/* linelen + null terminator */
1142 	if ((p = vim_realloc(fields->errmsg, linelen + 1)) == NULL)
1143 	    return QF_NOMEM;
1144 	fields->errmsg = p;
1145 	fields->errmsglen = linelen + 1;
1146     }
1147     /* copy whole line to error message */
1148     vim_strncpy(fields->errmsg, linebuf, linelen);
1149 
1150     return QF_OK;
1151 }
1152 
1153 /*
1154  * Parse multi-line error format prefixes (%C and %Z)
1155  */
1156     static int
1157 qf_parse_multiline_pfx(
1158 	qf_info_T *qi,
1159 	int qf_idx,
1160 	int idx,
1161 	qf_list_T *qfl,
1162 	qffields_T *fields)
1163 {
1164     char_u		*ptr;
1165     int			len;
1166 
1167     if (!qfl->qf_multiignore)
1168     {
1169 	qfline_T *qfprev = qfl->qf_last;
1170 
1171 	if (qfprev == NULL)
1172 	    return QF_FAIL;
1173 	if (*fields->errmsg && !qfl->qf_multiignore)
1174 	{
1175 	    len = (int)STRLEN(qfprev->qf_text);
1176 	    if ((ptr = alloc((unsigned)(len + STRLEN(fields->errmsg) + 2)))
1177 		    == NULL)
1178 		return QF_FAIL;
1179 	    STRCPY(ptr, qfprev->qf_text);
1180 	    vim_free(qfprev->qf_text);
1181 	    qfprev->qf_text = ptr;
1182 	    *(ptr += len) = '\n';
1183 	    STRCPY(++ptr, fields->errmsg);
1184 	}
1185 	if (qfprev->qf_nr == -1)
1186 	    qfprev->qf_nr = fields->enr;
1187 	if (vim_isprintc(fields->type) && !qfprev->qf_type)
1188 	    /* only printable chars allowed */
1189 	    qfprev->qf_type = fields->type;
1190 
1191 	if (!qfprev->qf_lnum)
1192 	    qfprev->qf_lnum = fields->lnum;
1193 	if (!qfprev->qf_col)
1194 	    qfprev->qf_col = fields->col;
1195 	qfprev->qf_viscol = fields->use_viscol;
1196 	if (!qfprev->qf_fnum)
1197 	    qfprev->qf_fnum = qf_get_fnum(qi, qf_idx,
1198 		    qfl->qf_directory,
1199 		    *fields->namebuf || qfl->qf_directory != NULL
1200 		    ? fields->namebuf
1201 		    : qfl->qf_currfile != NULL && fields->valid
1202 		    ? qfl->qf_currfile : 0);
1203     }
1204     if (idx == 'Z')
1205 	qfl->qf_multiline = qfl->qf_multiignore = FALSE;
1206     line_breakcheck();
1207 
1208     return QF_IGNORE_LINE;
1209 }
1210 
1211 /*
1212  * Parse a line and get the quickfix fields.
1213  * Return the QF_ status.
1214  */
1215     static int
1216 qf_parse_line(
1217 	qf_info_T	*qi,
1218 	int		qf_idx,
1219 	char_u		*linebuf,
1220 	int		linelen,
1221 	efm_T		*fmt_first,
1222 	qffields_T	*fields)
1223 {
1224     efm_T		*fmt_ptr;
1225     int			idx = 0;
1226     char_u		*tail = NULL;
1227     qf_list_T		*qfl = &qi->qf_lists[qf_idx];
1228     int			status;
1229 
1230 restofline:
1231     /* If there was no %> item start at the first pattern */
1232     if (fmt_start == NULL)
1233 	fmt_ptr = fmt_first;
1234     else
1235     {
1236 	/* Otherwise start from the last used pattern */
1237 	fmt_ptr = fmt_start;
1238 	fmt_start = NULL;
1239     }
1240 
1241     /*
1242      * Try to match each part of 'errorformat' until we find a complete
1243      * match or no match.
1244      */
1245     fields->valid = TRUE;
1246     for ( ; fmt_ptr != NULL; fmt_ptr = fmt_ptr->next)
1247     {
1248 	idx = fmt_ptr->prefix;
1249 	status = qf_parse_get_fields(linebuf, linelen, fmt_ptr, fields,
1250 				qfl->qf_multiline, qfl->qf_multiscan, &tail);
1251 	if (status == QF_NOMEM)
1252 	    return status;
1253 	if (status == QF_OK)
1254 	    break;
1255     }
1256     qfl->qf_multiscan = FALSE;
1257 
1258     if (fmt_ptr == NULL || idx == 'D' || idx == 'X')
1259     {
1260 	if (fmt_ptr != NULL)
1261 	{
1262 	    /* 'D' and 'X' directory specifiers */
1263 	    status = qf_parse_dir_pfx(idx, fields, qfl);
1264 	    if (status != QF_OK)
1265 		return status;
1266 	}
1267 
1268 	status = qf_parse_line_nomatch(linebuf, linelen, fields);
1269 	if (status != QF_OK)
1270 	    return status;
1271 
1272 	if (fmt_ptr == NULL)
1273 	    qfl->qf_multiline = qfl->qf_multiignore = FALSE;
1274     }
1275     else if (fmt_ptr != NULL)
1276     {
1277 	/* honor %> item */
1278 	if (fmt_ptr->conthere)
1279 	    fmt_start = fmt_ptr;
1280 
1281 	if (vim_strchr((char_u *)"AEWI", idx) != NULL)
1282 	{
1283 	    qfl->qf_multiline = TRUE;	/* start of a multi-line message */
1284 	    qfl->qf_multiignore = FALSE;/* reset continuation */
1285 	}
1286 	else if (vim_strchr((char_u *)"CZ", idx) != NULL)
1287 	{				/* continuation of multi-line msg */
1288 	    status = qf_parse_multiline_pfx(qi, qf_idx, idx, qfl, fields);
1289 	    if (status != QF_OK)
1290 		return status;
1291 	}
1292 	else if (vim_strchr((char_u *)"OPQ", idx) != NULL)
1293 	{				/* global file names */
1294 	    status = qf_parse_file_pfx(idx, fields, qfl, tail);
1295 	    if (status == QF_MULTISCAN)
1296 		goto restofline;
1297 	}
1298 	if (fmt_ptr->flags == '-')	/* generally exclude this line */
1299 	{
1300 	    if (qfl->qf_multiline)
1301 		/* also exclude continuation lines */
1302 		qfl->qf_multiignore = TRUE;
1303 	    return QF_IGNORE_LINE;
1304 	}
1305     }
1306 
1307     return QF_OK;
1308 }
1309 
1310 /*
1311  * Allocate the fields used for parsing lines and populating a quickfix list.
1312  */
1313     static int
1314 qf_alloc_fields(qffields_T *pfields)
1315 {
1316     pfields->namebuf = alloc_id(CMDBUFFSIZE + 1, aid_qf_namebuf);
1317     pfields->module = alloc_id(CMDBUFFSIZE + 1, aid_qf_module);
1318     pfields->errmsglen = CMDBUFFSIZE + 1;
1319     pfields->errmsg = alloc_id(pfields->errmsglen, aid_qf_errmsg);
1320     pfields->pattern = alloc_id(CMDBUFFSIZE + 1, aid_qf_pattern);
1321     if (pfields->namebuf == NULL || pfields->errmsg == NULL
1322 		|| pfields->pattern == NULL || pfields->module == NULL)
1323 	return FAIL;
1324 
1325     return OK;
1326 }
1327 
1328 /*
1329  * Free the fields used for parsing lines and populating a quickfix list.
1330  */
1331     static void
1332 qf_free_fields(qffields_T *pfields)
1333 {
1334     vim_free(pfields->namebuf);
1335     vim_free(pfields->module);
1336     vim_free(pfields->errmsg);
1337     vim_free(pfields->pattern);
1338 }
1339 
1340 /*
1341  * Setup the state information used for parsing lines and populating a
1342  * quickfix list.
1343  */
1344     static int
1345 qf_setup_state(
1346 	qfstate_T	*pstate,
1347 	char_u		*enc,
1348 	char_u		*efile,
1349 	typval_T	*tv,
1350 	buf_T		*buf,
1351 	linenr_T	lnumfirst,
1352 	linenr_T	lnumlast)
1353 {
1354 #ifdef FEAT_MBYTE
1355     pstate->vc.vc_type = CONV_NONE;
1356     if (enc != NULL && *enc != NUL)
1357 	convert_setup(&pstate->vc, enc, p_enc);
1358 #endif
1359 
1360     if (efile != NULL && (pstate->fd = mch_fopen((char *)efile, "r")) == NULL)
1361     {
1362 	EMSG2(_(e_openerrf), efile);
1363 	return FAIL;
1364     }
1365 
1366     if (tv != NULL)
1367     {
1368 	if (tv->v_type == VAR_STRING)
1369 	    pstate->p_str = tv->vval.v_string;
1370 	else if (tv->v_type == VAR_LIST)
1371 	    pstate->p_li = tv->vval.v_list->lv_first;
1372 	pstate->tv = tv;
1373     }
1374     pstate->buf = buf;
1375     pstate->buflnum = lnumfirst;
1376     pstate->lnumlast = lnumlast;
1377 
1378     return OK;
1379 }
1380 
1381 /*
1382  * Cleanup the state information used for parsing lines and populating a
1383  * quickfix list.
1384  */
1385     static void
1386 qf_cleanup_state(qfstate_T *pstate)
1387 {
1388     if (pstate->fd != NULL)
1389 	fclose(pstate->fd);
1390 
1391     vim_free(pstate->growbuf);
1392 #ifdef FEAT_MBYTE
1393     if (pstate->vc.vc_type != CONV_NONE)
1394 	convert_setup(&pstate->vc, NULL, NULL);
1395 #endif
1396 }
1397 
1398 /*
1399  * Read the errorfile "efile" into memory, line by line, building the error
1400  * list.
1401  * Alternative: when "efile" is NULL read errors from buffer "buf".
1402  * Alternative: when "tv" is not NULL get errors from the string or list.
1403  * Always use 'errorformat' from "buf" if there is a local value.
1404  * Then "lnumfirst" and "lnumlast" specify the range of lines to use.
1405  * Set the title of the list to "qf_title".
1406  * Return -1 for error, number of errors for success.
1407  */
1408     static int
1409 qf_init_ext(
1410     qf_info_T	    *qi,
1411     int		    qf_idx,
1412     char_u	    *efile,
1413     buf_T	    *buf,
1414     typval_T	    *tv,
1415     char_u	    *errorformat,
1416     int		    newlist,		/* TRUE: start a new error list */
1417     linenr_T	    lnumfirst,		/* first line number to use */
1418     linenr_T	    lnumlast,		/* last line number to use */
1419     char_u	    *qf_title,
1420     char_u	    *enc)
1421 {
1422     qf_list_T	    *qfl;
1423     qfstate_T	    state;
1424     qffields_T	    fields;
1425     qfline_T	    *old_last = NULL;
1426     int		    adding = FALSE;
1427     static efm_T    *fmt_first = NULL;
1428     char_u	    *efm;
1429     static char_u   *last_efm = NULL;
1430     int		    retval = -1;	/* default: return error flag */
1431     int		    status;
1432 
1433     /* Do not used the cached buffer, it may have been wiped out. */
1434     VIM_CLEAR(qf_last_bufname);
1435 
1436     vim_memset(&state, 0, sizeof(state));
1437     vim_memset(&fields, 0, sizeof(fields));
1438     if ((qf_alloc_fields(&fields) == FAIL) ||
1439 		(qf_setup_state(&state, enc, efile, tv, buf,
1440 					lnumfirst, lnumlast) == FAIL))
1441 	goto qf_init_end;
1442 
1443     if (newlist || qf_idx == qi->qf_listcount)
1444     {
1445 	/* make place for a new list */
1446 	qf_new_list(qi, qf_title);
1447 	qf_idx = qi->qf_curlist;
1448     }
1449     else
1450     {
1451 	/* Adding to existing list, use last entry. */
1452 	adding = TRUE;
1453 	if (qi->qf_lists[qf_idx].qf_count > 0)
1454 	    old_last = qi->qf_lists[qf_idx].qf_last;
1455     }
1456 
1457     qfl = &qi->qf_lists[qf_idx];
1458 
1459     /* Use the local value of 'errorformat' if it's set. */
1460     if (errorformat == p_efm && tv == NULL && *buf->b_p_efm != NUL)
1461 	efm = buf->b_p_efm;
1462     else
1463 	efm = errorformat;
1464 
1465     /*
1466      * If the errorformat didn't change between calls, then reuse the
1467      * previously parsed values.
1468      */
1469     if (last_efm == NULL || (STRCMP(last_efm, efm) != 0))
1470     {
1471 	/* free the previously parsed data */
1472 	VIM_CLEAR(last_efm);
1473 	free_efm_list(&fmt_first);
1474 
1475 	/* parse the current 'efm' */
1476 	fmt_first = parse_efm_option(efm);
1477 	if (fmt_first != NULL)
1478 	    last_efm = vim_strsave(efm);
1479     }
1480 
1481     if (fmt_first == NULL)	/* nothing found */
1482 	goto error2;
1483 
1484     /*
1485      * got_int is reset here, because it was probably set when killing the
1486      * ":make" command, but we still want to read the errorfile then.
1487      */
1488     got_int = FALSE;
1489 
1490     /*
1491      * Read the lines in the error file one by one.
1492      * Try to recognize one of the error formats in each line.
1493      */
1494     while (!got_int)
1495     {
1496 	/* Get the next line from a file/buffer/list/string */
1497 	status = qf_get_nextline(&state);
1498 	if (status == QF_NOMEM)		/* memory alloc failure */
1499 	    goto qf_init_end;
1500 	if (status == QF_END_OF_INPUT)	/* end of input */
1501 	    break;
1502 
1503 	status = qf_parse_line(qi, qf_idx, state.linebuf, state.linelen,
1504 							fmt_first, &fields);
1505 	if (status == QF_FAIL)
1506 	    goto error2;
1507 	if (status == QF_NOMEM)
1508 	    goto qf_init_end;
1509 	if (status == QF_IGNORE_LINE)
1510 	    continue;
1511 
1512 	if (qf_add_entry(qi,
1513 			qf_idx,
1514 			qfl->qf_directory,
1515 			(*fields.namebuf || qfl->qf_directory != NULL)
1516 			    ? fields.namebuf
1517 			    : ((qfl->qf_currfile != NULL && fields.valid)
1518 				? qfl->qf_currfile : (char_u *)NULL),
1519 			fields.module,
1520 			0,
1521 			fields.errmsg,
1522 			fields.lnum,
1523 			fields.col,
1524 			fields.use_viscol,
1525 			fields.pattern,
1526 			fields.enr,
1527 			fields.type,
1528 			fields.valid) == FAIL)
1529 	    goto error2;
1530 	line_breakcheck();
1531     }
1532     if (state.fd == NULL || !ferror(state.fd))
1533     {
1534 	if (qfl->qf_index == 0)
1535 	{
1536 	    /* no valid entry found */
1537 	    qfl->qf_ptr = qfl->qf_start;
1538 	    qfl->qf_index = 1;
1539 	    qfl->qf_nonevalid = TRUE;
1540 	}
1541 	else
1542 	{
1543 	    qfl->qf_nonevalid = FALSE;
1544 	    if (qfl->qf_ptr == NULL)
1545 		qfl->qf_ptr = qfl->qf_start;
1546 	}
1547 	/* return number of matches */
1548 	retval = qfl->qf_count;
1549 	goto qf_init_end;
1550     }
1551     EMSG(_(e_readerrf));
1552 error2:
1553     if (!adding)
1554     {
1555 	/* Error when creating a new list. Free the new list */
1556 	qf_free(qi, qi->qf_curlist);
1557 	qi->qf_listcount--;
1558 	if (qi->qf_curlist > 0)
1559 	    --qi->qf_curlist;
1560     }
1561 qf_init_end:
1562     if (qf_idx == qi->qf_curlist)
1563 	qf_update_buffer(qi, old_last);
1564     qf_cleanup_state(&state);
1565     qf_free_fields(&fields);
1566 
1567     return retval;
1568 }
1569 
1570 /*
1571  * Read the errorfile "efile" into memory, line by line, building the error
1572  * list. Set the error list's title to qf_title.
1573  * Return -1 for error, number of errors for success.
1574  */
1575     int
1576 qf_init(win_T	    *wp,
1577 	char_u	    *efile,
1578 	char_u	    *errorformat,
1579 	int	    newlist,		/* TRUE: start a new error list */
1580 	char_u	    *qf_title,
1581 	char_u	    *enc)
1582 {
1583     qf_info_T	    *qi = &ql_info;
1584 
1585     if (wp != NULL)
1586     {
1587 	qi = ll_get_or_alloc_list(wp);
1588 	if (qi == NULL)
1589 	    return FAIL;
1590     }
1591 
1592     return qf_init_ext(qi, qi->qf_curlist, efile, curbuf, NULL, errorformat,
1593 	    newlist, (linenr_T)0, (linenr_T)0, qf_title, enc);
1594 }
1595 
1596 /*
1597  * Set the title of the specified quickfix list. Frees the previous title.
1598  * Prepends ':' to the title.
1599  */
1600     static void
1601 qf_store_title(qf_info_T *qi, int qf_idx, char_u *title)
1602 {
1603     VIM_CLEAR(qi->qf_lists[qf_idx].qf_title);
1604 
1605     if (title != NULL)
1606     {
1607 	char_u *p = alloc((int)STRLEN(title) + 2);
1608 
1609 	qi->qf_lists[qf_idx].qf_title = p;
1610 	if (p != NULL)
1611 	    STRCPY(p, title);
1612     }
1613 }
1614 
1615 /*
1616  * The title of a quickfix/location list is set, by default, to the command
1617  * that created the quickfix list with the ":" prefix.
1618  * Create a quickfix list title string by prepending ":" to a user command.
1619  * Returns a pointer to a static buffer with the title.
1620  */
1621     static char_u *
1622 qf_cmdtitle(char_u *cmd)
1623 {
1624     static char_u qftitle_str[IOSIZE];
1625 
1626     vim_snprintf((char *)qftitle_str, IOSIZE, ":%s", (char *)cmd);
1627     return qftitle_str;
1628 }
1629 
1630 /*
1631  * Prepare for adding a new quickfix list. If the current list is in the
1632  * middle of the stack, then all the following lists are freed and then
1633  * the new list is added.
1634  */
1635     static void
1636 qf_new_list(qf_info_T *qi, char_u *qf_title)
1637 {
1638     int		i;
1639 
1640     /*
1641      * If the current entry is not the last entry, delete entries beyond
1642      * the current entry.  This makes it possible to browse in a tree-like
1643      * way with ":grep'.
1644      */
1645     while (qi->qf_listcount > qi->qf_curlist + 1)
1646 	qf_free(qi, --qi->qf_listcount);
1647 
1648     /*
1649      * When the stack is full, remove to oldest entry
1650      * Otherwise, add a new entry.
1651      */
1652     if (qi->qf_listcount == LISTCOUNT)
1653     {
1654 	qf_free(qi, 0);
1655 	for (i = 1; i < LISTCOUNT; ++i)
1656 	    qi->qf_lists[i - 1] = qi->qf_lists[i];
1657 	qi->qf_curlist = LISTCOUNT - 1;
1658     }
1659     else
1660 	qi->qf_curlist = qi->qf_listcount++;
1661     vim_memset(&qi->qf_lists[qi->qf_curlist], 0, (size_t)(sizeof(qf_list_T)));
1662     qf_store_title(qi, qi->qf_curlist, qf_title);
1663     qi->qf_lists[qi->qf_curlist].qf_id = ++last_qf_id;
1664 }
1665 
1666 /*
1667  * Free a location list
1668  */
1669     static void
1670 ll_free_all(qf_info_T **pqi)
1671 {
1672     int		i;
1673     qf_info_T	*qi;
1674 
1675     qi = *pqi;
1676     if (qi == NULL)
1677 	return;
1678     *pqi = NULL;	/* Remove reference to this list */
1679 
1680     qi->qf_refcount--;
1681     if (qi->qf_refcount < 1)
1682     {
1683 	/* No references to this location list */
1684 	for (i = 0; i < qi->qf_listcount; ++i)
1685 	    qf_free(qi, i);
1686 	vim_free(qi);
1687     }
1688 }
1689 
1690 /*
1691  * Free all the quickfix/location lists in the stack.
1692  */
1693     void
1694 qf_free_all(win_T *wp)
1695 {
1696     int		i;
1697     qf_info_T	*qi = &ql_info;
1698 
1699     if (wp != NULL)
1700     {
1701 	/* location list */
1702 	ll_free_all(&wp->w_llist);
1703 	ll_free_all(&wp->w_llist_ref);
1704     }
1705     else
1706 	/* quickfix list */
1707 	for (i = 0; i < qi->qf_listcount; ++i)
1708 	    qf_free(qi, i);
1709 }
1710 
1711 /*
1712  * Add an entry to the end of the list of errors.
1713  * Returns OK or FAIL.
1714  */
1715     static int
1716 qf_add_entry(
1717     qf_info_T	*qi,		/* quickfix list */
1718     int		qf_idx,		/* list index */
1719     char_u	*dir,		/* optional directory name */
1720     char_u	*fname,		/* file name or NULL */
1721     char_u	*module,	/* module name or NULL */
1722     int		bufnum,		/* buffer number or zero */
1723     char_u	*mesg,		/* message */
1724     long	lnum,		/* line number */
1725     int		col,		/* column */
1726     int		vis_col,	/* using visual column */
1727     char_u	*pattern,	/* search pattern */
1728     int		nr,		/* error number */
1729     int		type,		/* type character */
1730     int		valid)		/* valid entry */
1731 {
1732     qfline_T	*qfp;
1733     qfline_T	**lastp;	/* pointer to qf_last or NULL */
1734 
1735     if ((qfp = (qfline_T *)alloc((unsigned)sizeof(qfline_T))) == NULL)
1736 	return FAIL;
1737     if (bufnum != 0)
1738     {
1739 	buf_T *buf = buflist_findnr(bufnum);
1740 
1741 	qfp->qf_fnum = bufnum;
1742 	if (buf != NULL)
1743 	    buf->b_has_qf_entry |=
1744 		(qi == &ql_info) ? BUF_HAS_QF_ENTRY : BUF_HAS_LL_ENTRY;
1745     }
1746     else
1747 	qfp->qf_fnum = qf_get_fnum(qi, qf_idx, dir, fname);
1748     if ((qfp->qf_text = vim_strsave(mesg)) == NULL)
1749     {
1750 	vim_free(qfp);
1751 	return FAIL;
1752     }
1753     qfp->qf_lnum = lnum;
1754     qfp->qf_col = col;
1755     qfp->qf_viscol = vis_col;
1756     if (pattern == NULL || *pattern == NUL)
1757 	qfp->qf_pattern = NULL;
1758     else if ((qfp->qf_pattern = vim_strsave(pattern)) == NULL)
1759     {
1760 	vim_free(qfp->qf_text);
1761 	vim_free(qfp);
1762 	return FAIL;
1763     }
1764     if (module == NULL || *module == NUL)
1765 	qfp->qf_module = NULL;
1766     else if ((qfp->qf_module = vim_strsave(module)) == NULL)
1767     {
1768 	vim_free(qfp->qf_text);
1769 	vim_free(qfp->qf_pattern);
1770 	vim_free(qfp);
1771 	return FAIL;
1772     }
1773     qfp->qf_nr = nr;
1774     if (type != 1 && !vim_isprintc(type)) /* only printable chars allowed */
1775 	type = 0;
1776     qfp->qf_type = type;
1777     qfp->qf_valid = valid;
1778 
1779     lastp = &qi->qf_lists[qf_idx].qf_last;
1780     if (qi->qf_lists[qf_idx].qf_count == 0)
1781 				/* first element in the list */
1782     {
1783 	qi->qf_lists[qf_idx].qf_start = qfp;
1784 	qi->qf_lists[qf_idx].qf_ptr = qfp;
1785 	qi->qf_lists[qf_idx].qf_index = 0;
1786 	qfp->qf_prev = NULL;
1787     }
1788     else
1789     {
1790 	qfp->qf_prev = *lastp;
1791 	(*lastp)->qf_next = qfp;
1792     }
1793     qfp->qf_next = NULL;
1794     qfp->qf_cleared = FALSE;
1795     *lastp = qfp;
1796     ++qi->qf_lists[qf_idx].qf_count;
1797     if (qi->qf_lists[qf_idx].qf_index == 0 && qfp->qf_valid)
1798 				/* first valid entry */
1799     {
1800 	qi->qf_lists[qf_idx].qf_index =
1801 	    qi->qf_lists[qf_idx].qf_count;
1802 	qi->qf_lists[qf_idx].qf_ptr = qfp;
1803     }
1804 
1805     return OK;
1806 }
1807 
1808 /*
1809  * Allocate a new location list
1810  */
1811     static qf_info_T *
1812 ll_new_list(void)
1813 {
1814     qf_info_T *qi;
1815 
1816     qi = (qf_info_T *)alloc((unsigned)sizeof(qf_info_T));
1817     if (qi != NULL)
1818     {
1819 	vim_memset(qi, 0, (size_t)(sizeof(qf_info_T)));
1820 	qi->qf_refcount++;
1821     }
1822 
1823     return qi;
1824 }
1825 
1826 /*
1827  * Return the location list for window 'wp'.
1828  * If not present, allocate a location list
1829  */
1830     static qf_info_T *
1831 ll_get_or_alloc_list(win_T *wp)
1832 {
1833     if (IS_LL_WINDOW(wp))
1834 	/* For a location list window, use the referenced location list */
1835 	return wp->w_llist_ref;
1836 
1837     /*
1838      * For a non-location list window, w_llist_ref should not point to a
1839      * location list.
1840      */
1841     ll_free_all(&wp->w_llist_ref);
1842 
1843     if (wp->w_llist == NULL)
1844 	wp->w_llist = ll_new_list();	    /* new location list */
1845     return wp->w_llist;
1846 }
1847 
1848 /*
1849  * Copy the location list from window "from" to window "to".
1850  */
1851     void
1852 copy_loclist(win_T *from, win_T *to)
1853 {
1854     qf_info_T	*qi;
1855     int		idx;
1856     int		i;
1857 
1858     /*
1859      * When copying from a location list window, copy the referenced
1860      * location list. For other windows, copy the location list for
1861      * that window.
1862      */
1863     if (IS_LL_WINDOW(from))
1864 	qi = from->w_llist_ref;
1865     else
1866 	qi = from->w_llist;
1867 
1868     if (qi == NULL)		    /* no location list to copy */
1869 	return;
1870 
1871     /* allocate a new location list */
1872     if ((to->w_llist = ll_new_list()) == NULL)
1873 	return;
1874 
1875     to->w_llist->qf_listcount = qi->qf_listcount;
1876 
1877     /* Copy the location lists one at a time */
1878     for (idx = 0; idx < qi->qf_listcount; idx++)
1879     {
1880 	qf_list_T   *from_qfl;
1881 	qf_list_T   *to_qfl;
1882 
1883 	to->w_llist->qf_curlist = idx;
1884 
1885 	from_qfl = &qi->qf_lists[idx];
1886 	to_qfl = &to->w_llist->qf_lists[idx];
1887 
1888 	/* Some of the fields are populated by qf_add_entry() */
1889 	to_qfl->qf_nonevalid = from_qfl->qf_nonevalid;
1890 	to_qfl->qf_count = 0;
1891 	to_qfl->qf_index = 0;
1892 	to_qfl->qf_start = NULL;
1893 	to_qfl->qf_last = NULL;
1894 	to_qfl->qf_ptr = NULL;
1895 	if (from_qfl->qf_title != NULL)
1896 	    to_qfl->qf_title = vim_strsave(from_qfl->qf_title);
1897 	else
1898 	    to_qfl->qf_title = NULL;
1899 	if (from_qfl->qf_ctx != NULL)
1900 	{
1901 	    to_qfl->qf_ctx = alloc_tv();
1902 	    if (to_qfl->qf_ctx != NULL)
1903 		copy_tv(from_qfl->qf_ctx, to_qfl->qf_ctx);
1904 	}
1905 	else
1906 	    to_qfl->qf_ctx = NULL;
1907 
1908 	if (from_qfl->qf_count)
1909 	{
1910 	    qfline_T    *from_qfp;
1911 	    qfline_T    *prevp;
1912 
1913 	    /* copy all the location entries in this list */
1914 	    for (i = 0, from_qfp = from_qfl->qf_start;
1915 		    i < from_qfl->qf_count && from_qfp != NULL;
1916 		    ++i, from_qfp = from_qfp->qf_next)
1917 	    {
1918 		if (qf_add_entry(to->w_llist,
1919 				 to->w_llist->qf_curlist,
1920 				 NULL,
1921 				 NULL,
1922 				 from_qfp->qf_module,
1923 				 0,
1924 				 from_qfp->qf_text,
1925 				 from_qfp->qf_lnum,
1926 				 from_qfp->qf_col,
1927 				 from_qfp->qf_viscol,
1928 				 from_qfp->qf_pattern,
1929 				 from_qfp->qf_nr,
1930 				 0,
1931 				 from_qfp->qf_valid) == FAIL)
1932 		{
1933 		    qf_free_all(to);
1934 		    return;
1935 		}
1936 		/*
1937 		 * qf_add_entry() will not set the qf_num field, as the
1938 		 * directory and file names are not supplied. So the qf_fnum
1939 		 * field is copied here.
1940 		 */
1941 		prevp = to->w_llist->qf_lists[to->w_llist->qf_curlist].qf_last;
1942 		prevp->qf_fnum = from_qfp->qf_fnum; /* file number */
1943 		prevp->qf_type = from_qfp->qf_type; /* error type */
1944 		if (from_qfl->qf_ptr == from_qfp)
1945 		    to_qfl->qf_ptr = prevp;	    /* current location */
1946 	    }
1947 	}
1948 
1949 	to_qfl->qf_index = from_qfl->qf_index;	/* current index in the list */
1950 
1951 	/* Assign a new ID for the location list */
1952 	to_qfl->qf_id = ++last_qf_id;
1953 	to_qfl->qf_changedtick = 0L;
1954 
1955 	/* When no valid entries are present in the list, qf_ptr points to
1956 	 * the first item in the list */
1957 	if (to_qfl->qf_nonevalid)
1958 	{
1959 	    to_qfl->qf_ptr = to_qfl->qf_start;
1960 	    to_qfl->qf_index = 1;
1961 	}
1962     }
1963 
1964     to->w_llist->qf_curlist = qi->qf_curlist;	/* current list */
1965 }
1966 
1967 /*
1968  * Get buffer number for file "directory/fname".
1969  * Also sets the b_has_qf_entry flag.
1970  */
1971     static int
1972 qf_get_fnum(qf_info_T *qi, int qf_idx, char_u *directory, char_u *fname)
1973 {
1974     char_u	*ptr = NULL;
1975     buf_T	*buf;
1976     char_u	*bufname;
1977 
1978     if (fname == NULL || *fname == NUL)		/* no file name */
1979 	return 0;
1980 
1981 #ifdef VMS
1982     vms_remove_version(fname);
1983 #endif
1984 #ifdef BACKSLASH_IN_FILENAME
1985     if (directory != NULL)
1986 	slash_adjust(directory);
1987     slash_adjust(fname);
1988 #endif
1989     if (directory != NULL && !vim_isAbsName(fname)
1990 	    && (ptr = concat_fnames(directory, fname, TRUE)) != NULL)
1991     {
1992 	/*
1993 	 * Here we check if the file really exists.
1994 	 * This should normally be true, but if make works without
1995 	 * "leaving directory"-messages we might have missed a
1996 	 * directory change.
1997 	 */
1998 	if (mch_getperm(ptr) < 0)
1999 	{
2000 	    vim_free(ptr);
2001 	    directory = qf_guess_filepath(qi, qf_idx, fname);
2002 	    if (directory)
2003 		ptr = concat_fnames(directory, fname, TRUE);
2004 	    else
2005 		ptr = vim_strsave(fname);
2006 	}
2007 	/* Use concatenated directory name and file name */
2008 	bufname = ptr;
2009     }
2010     else
2011 	bufname = fname;
2012 
2013     if (qf_last_bufname != NULL && STRCMP(bufname, qf_last_bufname) == 0
2014 	    && bufref_valid(&qf_last_bufref))
2015     {
2016 	buf = qf_last_bufref.br_buf;
2017 	vim_free(ptr);
2018     }
2019     else
2020     {
2021 	vim_free(qf_last_bufname);
2022 	buf = buflist_new(bufname, NULL, (linenr_T)0, BLN_NOOPT);
2023 	if (bufname == ptr)
2024 	    qf_last_bufname = bufname;
2025 	else
2026 	    qf_last_bufname = vim_strsave(bufname);
2027 	set_bufref(&qf_last_bufref, buf);
2028     }
2029     if (buf == NULL)
2030 	return 0;
2031 
2032     buf->b_has_qf_entry =
2033 			(qi == &ql_info) ? BUF_HAS_QF_ENTRY : BUF_HAS_LL_ENTRY;
2034     return buf->b_fnum;
2035 }
2036 
2037 /*
2038  * Push dirbuf onto the directory stack and return pointer to actual dir or
2039  * NULL on error.
2040  */
2041     static char_u *
2042 qf_push_dir(char_u *dirbuf, struct dir_stack_T **stackptr, int is_file_stack)
2043 {
2044     struct dir_stack_T  *ds_new;
2045     struct dir_stack_T  *ds_ptr;
2046 
2047     /* allocate new stack element and hook it in */
2048     ds_new = (struct dir_stack_T *)alloc((unsigned)sizeof(struct dir_stack_T));
2049     if (ds_new == NULL)
2050 	return NULL;
2051 
2052     ds_new->next = *stackptr;
2053     *stackptr = ds_new;
2054 
2055     /* store directory on the stack */
2056     if (vim_isAbsName(dirbuf)
2057 	    || (*stackptr)->next == NULL
2058 	    || (*stackptr && is_file_stack))
2059 	(*stackptr)->dirname = vim_strsave(dirbuf);
2060     else
2061     {
2062 	/* Okay we don't have an absolute path.
2063 	 * dirbuf must be a subdir of one of the directories on the stack.
2064 	 * Let's search...
2065 	 */
2066 	ds_new = (*stackptr)->next;
2067 	(*stackptr)->dirname = NULL;
2068 	while (ds_new)
2069 	{
2070 	    vim_free((*stackptr)->dirname);
2071 	    (*stackptr)->dirname = concat_fnames(ds_new->dirname, dirbuf,
2072 		    TRUE);
2073 	    if (mch_isdir((*stackptr)->dirname) == TRUE)
2074 		break;
2075 
2076 	    ds_new = ds_new->next;
2077 	}
2078 
2079 	/* clean up all dirs we already left */
2080 	while ((*stackptr)->next != ds_new)
2081 	{
2082 	    ds_ptr = (*stackptr)->next;
2083 	    (*stackptr)->next = (*stackptr)->next->next;
2084 	    vim_free(ds_ptr->dirname);
2085 	    vim_free(ds_ptr);
2086 	}
2087 
2088 	/* Nothing found -> it must be on top level */
2089 	if (ds_new == NULL)
2090 	{
2091 	    vim_free((*stackptr)->dirname);
2092 	    (*stackptr)->dirname = vim_strsave(dirbuf);
2093 	}
2094     }
2095 
2096     if ((*stackptr)->dirname != NULL)
2097 	return (*stackptr)->dirname;
2098     else
2099     {
2100 	ds_ptr = *stackptr;
2101 	*stackptr = (*stackptr)->next;
2102 	vim_free(ds_ptr);
2103 	return NULL;
2104     }
2105 }
2106 
2107 /*
2108  * pop dirbuf from the directory stack and return previous directory or NULL if
2109  * stack is empty
2110  */
2111     static char_u *
2112 qf_pop_dir(struct dir_stack_T **stackptr)
2113 {
2114     struct dir_stack_T  *ds_ptr;
2115 
2116     /* TODO: Should we check if dirbuf is the directory on top of the stack?
2117      * What to do if it isn't? */
2118 
2119     /* pop top element and free it */
2120     if (*stackptr != NULL)
2121     {
2122 	ds_ptr = *stackptr;
2123 	*stackptr = (*stackptr)->next;
2124 	vim_free(ds_ptr->dirname);
2125 	vim_free(ds_ptr);
2126     }
2127 
2128     /* return NEW top element as current dir or NULL if stack is empty*/
2129     return *stackptr ? (*stackptr)->dirname : NULL;
2130 }
2131 
2132 /*
2133  * clean up directory stack
2134  */
2135     static void
2136 qf_clean_dir_stack(struct dir_stack_T **stackptr)
2137 {
2138     struct dir_stack_T  *ds_ptr;
2139 
2140     while ((ds_ptr = *stackptr) != NULL)
2141     {
2142 	*stackptr = (*stackptr)->next;
2143 	vim_free(ds_ptr->dirname);
2144 	vim_free(ds_ptr);
2145     }
2146 }
2147 
2148 /*
2149  * Check in which directory of the directory stack the given file can be
2150  * found.
2151  * Returns a pointer to the directory name or NULL if not found.
2152  * Cleans up intermediate directory entries.
2153  *
2154  * TODO: How to solve the following problem?
2155  * If we have this directory tree:
2156  *     ./
2157  *     ./aa
2158  *     ./aa/bb
2159  *     ./bb
2160  *     ./bb/x.c
2161  * and make says:
2162  *     making all in aa
2163  *     making all in bb
2164  *     x.c:9: Error
2165  * Then qf_push_dir thinks we are in ./aa/bb, but we are in ./bb.
2166  * qf_guess_filepath will return NULL.
2167  */
2168     static char_u *
2169 qf_guess_filepath(qf_info_T *qi, int qf_idx, char_u *filename)
2170 {
2171     struct dir_stack_T     *ds_ptr;
2172     struct dir_stack_T     *ds_tmp;
2173     char_u		   *fullname;
2174     qf_list_T		   *qfl = &qi->qf_lists[qf_idx];
2175 
2176     /* no dirs on the stack - there's nothing we can do */
2177     if (qfl->qf_dir_stack == NULL)
2178 	return NULL;
2179 
2180     ds_ptr = qfl->qf_dir_stack->next;
2181     fullname = NULL;
2182     while (ds_ptr)
2183     {
2184 	vim_free(fullname);
2185 	fullname = concat_fnames(ds_ptr->dirname, filename, TRUE);
2186 
2187 	/* If concat_fnames failed, just go on. The worst thing that can happen
2188 	 * is that we delete the entire stack.
2189 	 */
2190 	if ((fullname != NULL) && (mch_getperm(fullname) >= 0))
2191 	    break;
2192 
2193 	ds_ptr = ds_ptr->next;
2194     }
2195 
2196     vim_free(fullname);
2197 
2198     /* clean up all dirs we already left */
2199     while (qfl->qf_dir_stack->next != ds_ptr)
2200     {
2201 	ds_tmp = qfl->qf_dir_stack->next;
2202 	qfl->qf_dir_stack->next = qfl->qf_dir_stack->next->next;
2203 	vim_free(ds_tmp->dirname);
2204 	vim_free(ds_tmp);
2205     }
2206 
2207     return ds_ptr == NULL ? NULL : ds_ptr->dirname;
2208 }
2209 
2210 /*
2211  * Returns TRUE if a quickfix/location list with the given identifier exists.
2212  */
2213     static int
2214 qflist_valid (win_T *wp, int_u qf_id)
2215 {
2216     qf_info_T	*qi = &ql_info;
2217     int		i;
2218 
2219     if (wp != NULL)
2220     {
2221 	qi = GET_LOC_LIST(wp);	    /* Location list */
2222 	if (qi == NULL)
2223 	    return FALSE;
2224     }
2225 
2226     for (i = 0; i < qi->qf_listcount; ++i)
2227 	if (qi->qf_lists[i].qf_id == qf_id)
2228 	    return TRUE;
2229 
2230     return FALSE;
2231 }
2232 
2233 /*
2234  * When loading a file from the quickfix, the autocommands may modify it.
2235  * This may invalidate the current quickfix entry.  This function checks
2236  * whether an entry is still present in the quickfix list.
2237  * Similar to location list.
2238  */
2239     static int
2240 is_qf_entry_present(qf_info_T *qi, qfline_T *qf_ptr)
2241 {
2242     qf_list_T	*qfl;
2243     qfline_T	*qfp;
2244     int		i;
2245 
2246     qfl = &qi->qf_lists[qi->qf_curlist];
2247 
2248     /* Search for the entry in the current list */
2249     for (i = 0, qfp = qfl->qf_start; i < qfl->qf_count;
2250 	    ++i, qfp = qfp->qf_next)
2251 	if (qfp == NULL || qfp == qf_ptr)
2252 	    break;
2253 
2254     if (i == qfl->qf_count) /* Entry is not found */
2255 	return FALSE;
2256 
2257     return TRUE;
2258 }
2259 
2260 /*
2261  * Get the next valid entry in the current quickfix/location list. The search
2262  * starts from the current entry.  Returns NULL on failure.
2263  */
2264     static qfline_T *
2265 get_next_valid_entry(
2266 	qf_info_T	*qi,
2267 	qfline_T	*qf_ptr,
2268 	int		*qf_index,
2269 	int		dir)
2270 {
2271     int			idx;
2272     int			old_qf_fnum;
2273 
2274     idx = *qf_index;
2275     old_qf_fnum = qf_ptr->qf_fnum;
2276 
2277     do
2278     {
2279 	if (idx == qi->qf_lists[qi->qf_curlist].qf_count
2280 		|| qf_ptr->qf_next == NULL)
2281 	    return NULL;
2282 	++idx;
2283 	qf_ptr = qf_ptr->qf_next;
2284     } while ((!qi->qf_lists[qi->qf_curlist].qf_nonevalid
2285 		&& !qf_ptr->qf_valid)
2286 	    || (dir == FORWARD_FILE && qf_ptr->qf_fnum == old_qf_fnum));
2287 
2288     *qf_index = idx;
2289     return qf_ptr;
2290 }
2291 
2292 /*
2293  * Get the previous valid entry in the current quickfix/location list. The
2294  * search starts from the current entry.  Returns NULL on failure.
2295  */
2296     static qfline_T *
2297 get_prev_valid_entry(
2298 	qf_info_T	*qi,
2299 	qfline_T	*qf_ptr,
2300 	int		*qf_index,
2301 	int		dir)
2302 {
2303     int			idx;
2304     int			old_qf_fnum;
2305 
2306     idx = *qf_index;
2307     old_qf_fnum = qf_ptr->qf_fnum;
2308 
2309     do
2310     {
2311 	if (idx == 1 || qf_ptr->qf_prev == NULL)
2312 	    return NULL;
2313 	--idx;
2314 	qf_ptr = qf_ptr->qf_prev;
2315     } while ((!qi->qf_lists[qi->qf_curlist].qf_nonevalid
2316 		&& !qf_ptr->qf_valid)
2317 	    || (dir == BACKWARD_FILE && qf_ptr->qf_fnum == old_qf_fnum));
2318 
2319     *qf_index = idx;
2320     return qf_ptr;
2321 }
2322 
2323 /*
2324  * Get the n'th (errornr) previous/next valid entry from the current entry in
2325  * the quickfix list.
2326  *   dir == FORWARD or FORWARD_FILE: next valid entry
2327  *   dir == BACKWARD or BACKWARD_FILE: previous valid entry
2328  */
2329     static qfline_T *
2330 get_nth_valid_entry(
2331 	qf_info_T	*qi,
2332 	int		errornr,
2333 	qfline_T	*qf_ptr,
2334 	int		*qf_index,
2335 	int		dir)
2336 {
2337     qfline_T		*prev_qf_ptr;
2338     int			prev_index;
2339     static char_u	*e_no_more_items = (char_u *)N_("E553: No more items");
2340     char_u		*err = e_no_more_items;
2341 
2342     while (errornr--)
2343     {
2344 	prev_qf_ptr = qf_ptr;
2345 	prev_index = *qf_index;
2346 
2347 	if (dir == FORWARD || dir == FORWARD_FILE)
2348 	    qf_ptr = get_next_valid_entry(qi, qf_ptr, qf_index, dir);
2349 	else
2350 	    qf_ptr = get_prev_valid_entry(qi, qf_ptr, qf_index, dir);
2351 	if (qf_ptr == NULL)
2352 	{
2353 	    qf_ptr = prev_qf_ptr;
2354 	    *qf_index = prev_index;
2355 	    if (err != NULL)
2356 	    {
2357 		EMSG(_(err));
2358 		return NULL;
2359 	    }
2360 	    break;
2361 	}
2362 
2363 	err = NULL;
2364     }
2365 
2366     return qf_ptr;
2367 }
2368 
2369 /*
2370  * Get n'th (errornr) quickfix entry
2371  */
2372     static qfline_T *
2373 get_nth_entry(
2374 	qf_info_T	*qi,
2375 	int		errornr,
2376 	qfline_T	*qf_ptr,
2377 	int		*cur_qfidx)
2378 {
2379     int		qf_idx = *cur_qfidx;
2380 
2381     /* New error number is less than the current error number */
2382     while (errornr < qf_idx && qf_idx > 1 && qf_ptr->qf_prev != NULL)
2383     {
2384 	--qf_idx;
2385 	qf_ptr = qf_ptr->qf_prev;
2386     }
2387     /* New error number is greater than the current error number */
2388     while (errornr > qf_idx &&
2389 	    qf_idx < qi->qf_lists[qi->qf_curlist].qf_count &&
2390 	    qf_ptr->qf_next != NULL)
2391     {
2392 	++qf_idx;
2393 	qf_ptr = qf_ptr->qf_next;
2394     }
2395 
2396     *cur_qfidx = qf_idx;
2397     return qf_ptr;
2398 }
2399 
2400 /*
2401  * Find a window displaying a Vim help file.
2402  */
2403     static win_T *
2404 qf_find_help_win(void)
2405 {
2406     win_T *wp;
2407 
2408     FOR_ALL_WINDOWS(wp)
2409 	if (bt_help(wp->w_buffer))
2410 	    return wp;
2411 
2412     return NULL;
2413 }
2414 
2415 /*
2416  * Find a help window or open one.
2417  */
2418     static int
2419 jump_to_help_window(qf_info_T *qi, int *opened_window)
2420 {
2421     win_T	*wp;
2422     int		flags;
2423 
2424     if (cmdmod.tab != 0)
2425 	wp = NULL;
2426     else
2427 	wp = qf_find_help_win();
2428     if (wp != NULL && wp->w_buffer->b_nwindows > 0)
2429 	win_enter(wp, TRUE);
2430     else
2431     {
2432 	/*
2433 	 * Split off help window; put it at far top if no position
2434 	 * specified, the current window is vertically split and narrow.
2435 	 */
2436 	flags = WSP_HELP;
2437 	if (cmdmod.split == 0 && curwin->w_width != Columns
2438 		&& curwin->w_width < 80)
2439 	    flags |= WSP_TOP;
2440 	if (qi != &ql_info)
2441 	    flags |= WSP_NEWLOC;  /* don't copy the location list */
2442 
2443 	if (win_split(0, flags) == FAIL)
2444 	    return FAIL;
2445 
2446 	*opened_window = TRUE;
2447 
2448 	if (curwin->w_height < p_hh)
2449 	    win_setheight((int)p_hh);
2450 
2451 	if (qi != &ql_info)	    /* not a quickfix list */
2452 	{
2453 	    /* The new window should use the supplied location list */
2454 	    curwin->w_llist = qi;
2455 	    qi->qf_refcount++;
2456 	}
2457     }
2458 
2459     if (!p_im)
2460 	restart_edit = 0;	    /* don't want insert mode in help file */
2461 
2462     return OK;
2463 }
2464 
2465 /*
2466  * Find a non-quickfix window using the given location list.
2467  * Returns NULL if a matching window is not found.
2468  */
2469     static win_T *
2470 qf_find_win_with_loclist(qf_info_T *ll)
2471 {
2472     win_T	*wp;
2473 
2474     FOR_ALL_WINDOWS(wp)
2475 	if (wp->w_llist == ll && !bt_quickfix(wp->w_buffer))
2476 	    return wp;
2477 
2478     return NULL;
2479 }
2480 
2481 /*
2482  * Find a window containing a normal buffer
2483  */
2484     static win_T *
2485 qf_find_win_with_normal_buf(void)
2486 {
2487     win_T	*wp;
2488 
2489     FOR_ALL_WINDOWS(wp)
2490 	if (wp->w_buffer->b_p_bt[0] == NUL)
2491 	    return wp;
2492 
2493     return NULL;
2494 }
2495 
2496 /*
2497  * Go to a window in any tabpage containing the specified file.  Returns TRUE
2498  * if successfully jumped to the window. Otherwise returns FALSE.
2499  */
2500     static int
2501 qf_goto_tabwin_with_file(int fnum)
2502 {
2503     tabpage_T	*tp;
2504     win_T	*wp;
2505 
2506     FOR_ALL_TAB_WINDOWS(tp, wp)
2507 	if (wp->w_buffer->b_fnum == fnum)
2508 	{
2509 	    goto_tabpage_win(tp, wp);
2510 	    return TRUE;
2511 	}
2512 
2513     return FALSE;
2514 }
2515 
2516 /*
2517  * Create a new window to show a file above the quickfix window. Called when
2518  * only the quickfix window is present.
2519  */
2520     static int
2521 qf_open_new_file_win(qf_info_T *ll_ref)
2522 {
2523     int		flags;
2524 
2525     flags = WSP_ABOVE;
2526     if (ll_ref != NULL)
2527 	flags |= WSP_NEWLOC;
2528     if (win_split(0, flags) == FAIL)
2529 	return FAIL;		/* not enough room for window */
2530     p_swb = empty_option;	/* don't split again */
2531     swb_flags = 0;
2532     RESET_BINDING(curwin);
2533     if (ll_ref != NULL)
2534     {
2535 	/* The new window should use the location list from the
2536 	 * location list window */
2537 	curwin->w_llist = ll_ref;
2538 	ll_ref->qf_refcount++;
2539     }
2540     return OK;
2541 }
2542 
2543 /*
2544  * Go to a window that shows the right buffer. If the window is not found, go
2545  * to the window just above the location list window. This is used for opening
2546  * a file from a location window and not from a quickfix window. If some usable
2547  * window is previously found, then it is supplied in 'use_win'.
2548  */
2549     static void
2550 qf_goto_win_with_ll_file(win_T *use_win, int qf_fnum, qf_info_T *ll_ref)
2551 {
2552     win_T	*win = use_win;
2553 
2554     if (win == NULL)
2555     {
2556 	/* Find the window showing the selected file */
2557 	FOR_ALL_WINDOWS(win)
2558 	    if (win->w_buffer->b_fnum == qf_fnum)
2559 		break;
2560 	if (win == NULL)
2561 	{
2562 	    /* Find a previous usable window */
2563 	    win = curwin;
2564 	    do
2565 	    {
2566 		if (win->w_buffer->b_p_bt[0] == NUL)
2567 		    break;
2568 		if (win->w_prev == NULL)
2569 		    win = lastwin;	/* wrap around the top */
2570 		else
2571 		    win = win->w_prev; /* go to previous window */
2572 	    } while (win != curwin);
2573 	}
2574     }
2575     win_goto(win);
2576 
2577     /* If the location list for the window is not set, then set it
2578      * to the location list from the location window */
2579     if (win->w_llist == NULL)
2580     {
2581 	win->w_llist = ll_ref;
2582 	if (ll_ref != NULL)
2583 	    ll_ref->qf_refcount++;
2584     }
2585 }
2586 
2587 /*
2588  * Go to a window that shows the specified file. If a window is not found, go
2589  * to the window just above the quickfix window. This is used for opening a
2590  * file from a quickfix window and not from a location window.
2591  */
2592     static void
2593 qf_goto_win_with_qfl_file(int qf_fnum)
2594 {
2595     win_T	*win;
2596     win_T	*altwin;
2597 
2598     win = curwin;
2599     altwin = NULL;
2600     for (;;)
2601     {
2602 	if (win->w_buffer->b_fnum == qf_fnum)
2603 	    break;
2604 	if (win->w_prev == NULL)
2605 	    win = lastwin;	/* wrap around the top */
2606 	else
2607 	    win = win->w_prev;	/* go to previous window */
2608 
2609 	if (IS_QF_WINDOW(win))
2610 	{
2611 	    /* Didn't find it, go to the window before the quickfix
2612 	     * window. */
2613 	    if (altwin != NULL)
2614 		win = altwin;
2615 	    else if (curwin->w_prev != NULL)
2616 		win = curwin->w_prev;
2617 	    else
2618 		win = curwin->w_next;
2619 	    break;
2620 	}
2621 
2622 	/* Remember a usable window. */
2623 	if (altwin == NULL && !win->w_p_pvw
2624 		&& win->w_buffer->b_p_bt[0] == NUL)
2625 	    altwin = win;
2626     }
2627 
2628     win_goto(win);
2629 }
2630 
2631 /*
2632  * Find a suitable window for opening a file (qf_fnum) from the
2633  * quickfix/location list and jump to it.  If the file is already opened in a
2634  * window, jump to it. Otherwise open a new window to display the file. This is
2635  * called from either a quickfix or a location list window.
2636  */
2637     static int
2638 qf_jump_to_usable_window(int qf_fnum, int *opened_window)
2639 {
2640     win_T	*usable_win_ptr = NULL;
2641     int		usable_win;
2642     qf_info_T	*ll_ref;
2643     win_T	*win;
2644 
2645     usable_win = 0;
2646 
2647     ll_ref = curwin->w_llist_ref;
2648     if (ll_ref != NULL)
2649     {
2650 	/* Find a non-quickfix window with this location list */
2651 	usable_win_ptr = qf_find_win_with_loclist(ll_ref);
2652 	if (usable_win_ptr != NULL)
2653 	    usable_win = 1;
2654     }
2655 
2656     if (!usable_win)
2657     {
2658 	/* Locate a window showing a normal buffer */
2659 	win = qf_find_win_with_normal_buf();
2660 	if (win != NULL)
2661 	    usable_win = 1;
2662     }
2663 
2664     /*
2665      * If no usable window is found and 'switchbuf' contains "usetab"
2666      * then search in other tabs.
2667      */
2668     if (!usable_win && (swb_flags & SWB_USETAB))
2669 	usable_win = qf_goto_tabwin_with_file(qf_fnum);
2670 
2671     /*
2672      * If there is only one window and it is the quickfix window, create a
2673      * new one above the quickfix window.
2674      */
2675     if ((ONE_WINDOW && bt_quickfix(curbuf)) || !usable_win)
2676     {
2677 	if (qf_open_new_file_win(ll_ref) != OK)
2678 	    return FAIL;
2679 	*opened_window = TRUE;	/* close it when fail */
2680     }
2681     else
2682     {
2683 	if (curwin->w_llist_ref != NULL)	/* In a location window */
2684 	    qf_goto_win_with_ll_file(usable_win_ptr, qf_fnum, ll_ref);
2685 	else					/* In a quickfix window */
2686 	    qf_goto_win_with_qfl_file(qf_fnum);
2687     }
2688 
2689     return OK;
2690 }
2691 
2692 /*
2693  * Edit the selected file or help file.
2694  */
2695     static int
2696 qf_jump_edit_buffer(
2697 	qf_info_T	*qi,
2698 	qfline_T	*qf_ptr,
2699 	int		forceit,
2700 	win_T		*oldwin,
2701 	int		*opened_window,
2702 	int		*abort)
2703 {
2704     int		retval = OK;
2705 
2706     if (qf_ptr->qf_type == 1)
2707     {
2708 	/* Open help file (do_ecmd() will set b_help flag, readfile() will
2709 	 * set b_p_ro flag). */
2710 	if (!can_abandon(curbuf, forceit))
2711 	{
2712 	    no_write_message();
2713 	    retval = FAIL;
2714 	}
2715 	else
2716 	    retval = do_ecmd(qf_ptr->qf_fnum, NULL, NULL, NULL, (linenr_T)1,
2717 		    ECMD_HIDE + ECMD_SET_HELP,
2718 		    oldwin == curwin ? curwin : NULL);
2719     }
2720     else
2721     {
2722 	int old_qf_curlist = qi->qf_curlist;
2723 	int save_qfid = qi->qf_lists[qi->qf_curlist].qf_id;
2724 
2725 	retval = buflist_getfile(qf_ptr->qf_fnum,
2726 		(linenr_T)1, GETF_SETMARK | GETF_SWITCH, forceit);
2727 
2728 	if (qi != &ql_info)
2729 	{
2730 	    /*
2731 	     * Location list. Check whether the associated window is still
2732 	     * present and the list is still valid.
2733 	     */
2734 	    if (!win_valid_any_tab(oldwin))
2735 	    {
2736 		EMSG(_("E924: Current window was closed"));
2737 		*abort = TRUE;
2738 		*opened_window = FALSE;
2739 	    }
2740 	    else if (!qflist_valid(oldwin, save_qfid))
2741 	    {
2742 		EMSG(_(e_loc_list_changed));
2743 		*abort = TRUE;
2744 	    }
2745 	}
2746 	else if (old_qf_curlist != qi->qf_curlist
2747 		|| !is_qf_entry_present(qi, qf_ptr))
2748 	{
2749 	    if (qi == &ql_info)
2750 		EMSG(_("E925: Current quickfix was changed"));
2751 	    else
2752 		EMSG(_(e_loc_list_changed));
2753 	    *abort = TRUE;
2754 	}
2755 
2756 	if (*abort)
2757 	    retval = FAIL;
2758     }
2759 
2760     return retval;
2761 }
2762 
2763 /*
2764  * Go to the error line in the current file using either line/column number or
2765  * a search pattern.
2766  */
2767     static void
2768 qf_jump_goto_line(
2769 	linenr_T	qf_lnum,
2770 	int		qf_col,
2771 	char_u		qf_viscol,
2772 	char_u		*qf_pattern)
2773 {
2774     linenr_T		i;
2775     char_u		*line;
2776     colnr_T		screen_col;
2777     colnr_T		char_col;
2778 
2779     if (qf_pattern == NULL)
2780     {
2781 	/*
2782 	 * Go to line with error, unless qf_lnum is 0.
2783 	 */
2784 	i = qf_lnum;
2785 	if (i > 0)
2786 	{
2787 	    if (i > curbuf->b_ml.ml_line_count)
2788 		i = curbuf->b_ml.ml_line_count;
2789 	    curwin->w_cursor.lnum = i;
2790 	}
2791 	if (qf_col > 0)
2792 	{
2793 	    curwin->w_cursor.col = qf_col - 1;
2794 #ifdef FEAT_VIRTUALEDIT
2795 	    curwin->w_cursor.coladd = 0;
2796 #endif
2797 	    if (qf_viscol == TRUE)
2798 	    {
2799 		/*
2800 		 * Check each character from the beginning of the error
2801 		 * line up to the error column.  For each tab character
2802 		 * found, reduce the error column value by the length of
2803 		 * a tab character.
2804 		 */
2805 		line = ml_get_curline();
2806 		screen_col = 0;
2807 		for (char_col = 0; char_col < curwin->w_cursor.col; ++char_col)
2808 		{
2809 		    if (*line == NUL)
2810 			break;
2811 		    if (*line++ == '\t')
2812 		    {
2813 			curwin->w_cursor.col -= 7 - (screen_col % 8);
2814 			screen_col += 8 - (screen_col % 8);
2815 		    }
2816 		    else
2817 			++screen_col;
2818 		}
2819 	    }
2820 	    check_cursor();
2821 	}
2822 	else
2823 	    beginline(BL_WHITE | BL_FIX);
2824     }
2825     else
2826     {
2827 	pos_T save_cursor;
2828 
2829 	/* Move the cursor to the first line in the buffer */
2830 	save_cursor = curwin->w_cursor;
2831 	curwin->w_cursor.lnum = 0;
2832 	if (!do_search(NULL, '/', qf_pattern, (long)1,
2833 		    SEARCH_KEEP, NULL, NULL))
2834 	    curwin->w_cursor = save_cursor;
2835     }
2836 }
2837 
2838 /*
2839  * Display quickfix list index and size message
2840  */
2841     static void
2842 qf_jump_print_msg(
2843 	qf_info_T	*qi,
2844 	int		qf_index,
2845 	qfline_T	*qf_ptr,
2846 	buf_T		*old_curbuf,
2847 	linenr_T	old_lnum)
2848 {
2849     linenr_T		i;
2850     int			len;
2851 
2852     /* Update the screen before showing the message, unless the screen
2853      * scrolled up. */
2854     if (!msg_scrolled)
2855 	update_topline_redraw();
2856     sprintf((char *)IObuff, _("(%d of %d)%s%s: "), qf_index,
2857 	    qi->qf_lists[qi->qf_curlist].qf_count,
2858 	    qf_ptr->qf_cleared ? _(" (line deleted)") : "",
2859 	    (char *)qf_types(qf_ptr->qf_type, qf_ptr->qf_nr));
2860     /* Add the message, skipping leading whitespace and newlines. */
2861     len = (int)STRLEN(IObuff);
2862     qf_fmt_text(skipwhite(qf_ptr->qf_text), IObuff + len, IOSIZE - len);
2863 
2864     /* Output the message.  Overwrite to avoid scrolling when the 'O'
2865      * flag is present in 'shortmess'; But when not jumping, print the
2866      * whole message. */
2867     i = msg_scroll;
2868     if (curbuf == old_curbuf && curwin->w_cursor.lnum == old_lnum)
2869 	msg_scroll = TRUE;
2870     else if (!msg_scrolled && shortmess(SHM_OVERALL))
2871 	msg_scroll = FALSE;
2872     msg_attr_keep(IObuff, 0, TRUE);
2873     msg_scroll = i;
2874 }
2875 
2876 /*
2877  * jump to a quickfix line
2878  * if dir == FORWARD go "errornr" valid entries forward
2879  * if dir == BACKWARD go "errornr" valid entries backward
2880  * if dir == FORWARD_FILE go "errornr" valid entries files backward
2881  * if dir == BACKWARD_FILE go "errornr" valid entries files backward
2882  * else if "errornr" is zero, redisplay the same line
2883  * else go to entry "errornr"
2884  */
2885     void
2886 qf_jump(qf_info_T	*qi,
2887 	int		dir,
2888 	int		errornr,
2889 	int		forceit)
2890 {
2891     qfline_T		*qf_ptr;
2892     qfline_T		*old_qf_ptr;
2893     int			qf_index;
2894     int			old_qf_index;
2895     buf_T		*old_curbuf;
2896     linenr_T		old_lnum;
2897     char_u		*old_swb = p_swb;
2898     unsigned		old_swb_flags = swb_flags;
2899     int			opened_window = FALSE;
2900     win_T		*oldwin = curwin;
2901     int			print_message = TRUE;
2902 #ifdef FEAT_FOLDING
2903     int			old_KeyTyped = KeyTyped; /* getting file may reset it */
2904 #endif
2905     int			retval = OK;
2906 
2907     if (qi == NULL)
2908 	qi = &ql_info;
2909 
2910     if (qi->qf_curlist >= qi->qf_listcount
2911 	|| qi->qf_lists[qi->qf_curlist].qf_count == 0)
2912     {
2913 	EMSG(_(e_quickfix));
2914 	return;
2915     }
2916 
2917     qf_ptr = qi->qf_lists[qi->qf_curlist].qf_ptr;
2918     old_qf_ptr = qf_ptr;
2919     qf_index = qi->qf_lists[qi->qf_curlist].qf_index;
2920     old_qf_index = qf_index;
2921     if (dir != 0)    /* next/prev valid entry */
2922     {
2923 	qf_ptr = get_nth_valid_entry(qi, errornr, qf_ptr, &qf_index, dir);
2924 	if (qf_ptr == NULL)
2925 	{
2926 	    qf_ptr = old_qf_ptr;
2927 	    qf_index = old_qf_index;
2928 	    goto theend;
2929 	}
2930     }
2931     else if (errornr != 0)	/* go to specified number */
2932 	qf_ptr = get_nth_entry(qi, errornr, qf_ptr, &qf_index);
2933 
2934     qi->qf_lists[qi->qf_curlist].qf_index = qf_index;
2935     if (qf_win_pos_update(qi, old_qf_index))
2936 	/* No need to print the error message if it's visible in the error
2937 	 * window */
2938 	print_message = FALSE;
2939 
2940     /*
2941      * For ":helpgrep" find a help window or open one.
2942      */
2943     if (qf_ptr->qf_type == 1 && (!bt_help(curwin->w_buffer) || cmdmod.tab != 0))
2944 	if (jump_to_help_window(qi, &opened_window) == FAIL)
2945 	    goto theend;
2946 
2947     /*
2948      * If currently in the quickfix window, find another window to show the
2949      * file in.
2950      */
2951     if (bt_quickfix(curbuf) && !opened_window)
2952     {
2953 	/*
2954 	 * If there is no file specified, we don't know where to go.
2955 	 * But do advance, otherwise ":cn" gets stuck.
2956 	 */
2957 	if (qf_ptr->qf_fnum == 0)
2958 	    goto theend;
2959 
2960 	if (qf_jump_to_usable_window(qf_ptr->qf_fnum, &opened_window) == FAIL)
2961 	    goto failed;
2962     }
2963 
2964     /*
2965      * If there is a file name,
2966      * read the wanted file if needed, and check autowrite etc.
2967      */
2968     old_curbuf = curbuf;
2969     old_lnum = curwin->w_cursor.lnum;
2970 
2971     if (qf_ptr->qf_fnum != 0)
2972     {
2973 	int abort = FALSE;
2974 
2975 	retval = qf_jump_edit_buffer(qi, qf_ptr, forceit, oldwin,
2976 						&opened_window, &abort);
2977 	if (abort)
2978 	{
2979 	    qi = NULL;
2980 	    qf_ptr = NULL;
2981 	}
2982     }
2983 
2984     if (retval == OK)
2985     {
2986 	/* When not switched to another buffer, still need to set pc mark */
2987 	if (curbuf == old_curbuf)
2988 	    setpcmark();
2989 
2990 	if (qf_ptr != NULL)
2991 	    qf_jump_goto_line(qf_ptr->qf_lnum, qf_ptr->qf_col,
2992 				qf_ptr->qf_viscol, qf_ptr->qf_pattern);
2993 
2994 #ifdef FEAT_FOLDING
2995 	if ((fdo_flags & FDO_QUICKFIX) && old_KeyTyped)
2996 	    foldOpenCursor();
2997 #endif
2998 	if (print_message)
2999 	    qf_jump_print_msg(qi, qf_index, qf_ptr, old_curbuf, old_lnum);
3000     }
3001     else
3002     {
3003 	if (opened_window)
3004 	    win_close(curwin, TRUE);    /* Close opened window */
3005 	if (qf_ptr != NULL && qf_ptr->qf_fnum != 0)
3006 	{
3007 	    /*
3008 	     * Couldn't open file, so put index back where it was.  This could
3009 	     * happen if the file was readonly and we changed something.
3010 	     */
3011 failed:
3012 	    qf_ptr = old_qf_ptr;
3013 	    qf_index = old_qf_index;
3014 	}
3015     }
3016 theend:
3017     if (qi != NULL)
3018     {
3019 	qi->qf_lists[qi->qf_curlist].qf_ptr = qf_ptr;
3020 	qi->qf_lists[qi->qf_curlist].qf_index = qf_index;
3021     }
3022     if (p_swb != old_swb && opened_window)
3023     {
3024 	/* Restore old 'switchbuf' value, but not when an autocommand or
3025 	 * modeline has changed the value. */
3026 	if (p_swb == empty_option)
3027 	{
3028 	    p_swb = old_swb;
3029 	    swb_flags = old_swb_flags;
3030 	}
3031 	else
3032 	    free_string_option(old_swb);
3033     }
3034 }
3035 
3036 /*
3037  * ":clist": list all errors
3038  * ":llist": list all locations
3039  */
3040     void
3041 qf_list(exarg_T *eap)
3042 {
3043     buf_T	*buf;
3044     char_u	*fname;
3045     qfline_T	*qfp;
3046     int		i;
3047     int		idx1 = 1;
3048     int		idx2 = -1;
3049     char_u	*arg = eap->arg;
3050     int		plus = FALSE;
3051     int		qfFileAttr;
3052     int		qfSepAttr;
3053     int		qfLineAttr;
3054     int		filter_entry;
3055     int		all = eap->forceit;	/* if not :cl!, only show
3056 						   recognised errors */
3057     qf_info_T	*qi = &ql_info;
3058 
3059     if (eap->cmdidx == CMD_llist)
3060     {
3061 	qi = GET_LOC_LIST(curwin);
3062 	if (qi == NULL)
3063 	{
3064 	    EMSG(_(e_loclist));
3065 	    return;
3066 	}
3067     }
3068 
3069     if (qi->qf_curlist >= qi->qf_listcount
3070 	|| qi->qf_lists[qi->qf_curlist].qf_count == 0)
3071     {
3072 	EMSG(_(e_quickfix));
3073 	return;
3074     }
3075     if (*arg == '+')
3076     {
3077 	++arg;
3078 	plus = TRUE;
3079     }
3080     if (!get_list_range(&arg, &idx1, &idx2) || *arg != NUL)
3081     {
3082 	EMSG(_(e_trailing));
3083 	return;
3084     }
3085     if (plus)
3086     {
3087 	i = qi->qf_lists[qi->qf_curlist].qf_index;
3088 	idx2 = i + idx1;
3089 	idx1 = i;
3090     }
3091     else
3092     {
3093 	i = qi->qf_lists[qi->qf_curlist].qf_count;
3094 	if (idx1 < 0)
3095 	    idx1 = (-idx1 > i) ? 0 : idx1 + i + 1;
3096 	if (idx2 < 0)
3097 	    idx2 = (-idx2 > i) ? 0 : idx2 + i + 1;
3098     }
3099 
3100     /* Shorten all the file names, so that it is easy to read */
3101     shorten_fnames(FALSE);
3102 
3103     /*
3104      * Get the attributes for the different quickfix highlight items.  Note
3105      * that this depends on syntax items defined in the qf.vim syntax file
3106      */
3107     qfFileAttr = syn_name2attr((char_u *)"qfFileName");
3108     if (qfFileAttr == 0)
3109 	qfFileAttr = HL_ATTR(HLF_D);
3110     qfSepAttr = syn_name2attr((char_u *)"qfSeparator");
3111     if (qfSepAttr == 0)
3112 	qfSepAttr = HL_ATTR(HLF_D);
3113     qfLineAttr = syn_name2attr((char_u *)"qfLineNr");
3114     if (qfLineAttr == 0)
3115 	qfLineAttr = HL_ATTR(HLF_N);
3116 
3117     if (qi->qf_lists[qi->qf_curlist].qf_nonevalid)
3118 	all = TRUE;
3119     qfp = qi->qf_lists[qi->qf_curlist].qf_start;
3120     for (i = 1; !got_int && i <= qi->qf_lists[qi->qf_curlist].qf_count; )
3121     {
3122 	if ((qfp->qf_valid || all) && idx1 <= i && i <= idx2)
3123 	{
3124 	    if (got_int)
3125 		break;
3126 
3127 	    fname = NULL;
3128 	    if (qfp->qf_module != NULL && *qfp->qf_module != NUL)
3129 		vim_snprintf((char *)IObuff, IOSIZE, "%2d %s", i, (char *)qfp->qf_module);
3130 	    else {
3131 		if (qfp->qf_fnum != 0
3132 				&& (buf = buflist_findnr(qfp->qf_fnum)) != NULL)
3133 		{
3134 		    fname = buf->b_fname;
3135 		    if (qfp->qf_type == 1)	/* :helpgrep */
3136 			fname = gettail(fname);
3137 		}
3138 		if (fname == NULL)
3139 		    sprintf((char *)IObuff, "%2d", i);
3140 		else
3141 		    vim_snprintf((char *)IObuff, IOSIZE, "%2d %s",
3142 							     i, (char *)fname);
3143 	    }
3144 
3145 	    // Support for filtering entries using :filter /pat/ clist
3146 	    // Match against the module name, file name, search pattern and
3147 	    // text of the entry.
3148 	    filter_entry = TRUE;
3149 	    if (qfp->qf_module != NULL && *qfp->qf_module != NUL)
3150 		filter_entry &= message_filtered(qfp->qf_module);
3151 	    if (filter_entry && fname != NULL)
3152 		filter_entry &= message_filtered(fname);
3153 	    if (filter_entry && qfp->qf_pattern != NULL)
3154 		filter_entry &= message_filtered(qfp->qf_pattern);
3155 	    if (filter_entry)
3156 		filter_entry &= message_filtered(qfp->qf_text);
3157 	    if (filter_entry)
3158 		goto next_entry;
3159 
3160 	    msg_putchar('\n');
3161 	    msg_outtrans_attr(IObuff, i == qi->qf_lists[qi->qf_curlist].qf_index
3162 					   ? HL_ATTR(HLF_QFL) : qfFileAttr);
3163 
3164 	    if (qfp->qf_lnum != 0)
3165 		msg_puts_attr((char_u *)":", qfSepAttr);
3166 	    if (qfp->qf_lnum == 0)
3167 		IObuff[0] = NUL;
3168 	    else if (qfp->qf_col == 0)
3169 		sprintf((char *)IObuff, "%ld", qfp->qf_lnum);
3170 	    else
3171 		sprintf((char *)IObuff, "%ld col %d",
3172 						   qfp->qf_lnum, qfp->qf_col);
3173 	    sprintf((char *)IObuff + STRLEN(IObuff), "%s",
3174 				  (char *)qf_types(qfp->qf_type, qfp->qf_nr));
3175 	    msg_puts_attr(IObuff, qfLineAttr);
3176 	    msg_puts_attr((char_u *)":", qfSepAttr);
3177 	    if (qfp->qf_pattern != NULL)
3178 	    {
3179 		qf_fmt_text(qfp->qf_pattern, IObuff, IOSIZE);
3180 		msg_puts(IObuff);
3181 		msg_puts_attr((char_u *)":", qfSepAttr);
3182 	    }
3183 	    msg_puts((char_u *)" ");
3184 
3185 	    /* Remove newlines and leading whitespace from the text.  For an
3186 	     * unrecognized line keep the indent, the compiler may mark a word
3187 	     * with ^^^^. */
3188 	    qf_fmt_text((fname != NULL || qfp->qf_lnum != 0)
3189 				     ? skipwhite(qfp->qf_text) : qfp->qf_text,
3190 							      IObuff, IOSIZE);
3191 	    msg_prt_line(IObuff, FALSE);
3192 	    out_flush();		/* show one line at a time */
3193 	}
3194 
3195 next_entry:
3196 	qfp = qfp->qf_next;
3197 	if (qfp == NULL)
3198 	    break;
3199 	++i;
3200 	ui_breakcheck();
3201     }
3202 }
3203 
3204 /*
3205  * Remove newlines and leading whitespace from an error message.
3206  * Put the result in "buf[bufsize]".
3207  */
3208     static void
3209 qf_fmt_text(char_u *text, char_u *buf, int bufsize)
3210 {
3211     int		i;
3212     char_u	*p = text;
3213 
3214     for (i = 0; *p != NUL && i < bufsize - 1; ++i)
3215     {
3216 	if (*p == '\n')
3217 	{
3218 	    buf[i] = ' ';
3219 	    while (*++p != NUL)
3220 		if (!VIM_ISWHITE(*p) && *p != '\n')
3221 		    break;
3222 	}
3223 	else
3224 	    buf[i] = *p++;
3225     }
3226     buf[i] = NUL;
3227 }
3228 
3229 /*
3230  * Display information (list number, list size and the title) about a
3231  * quickfix/location list.
3232  */
3233     static void
3234 qf_msg(qf_info_T *qi, int which, char *lead)
3235 {
3236     char   *title = (char *)qi->qf_lists[which].qf_title;
3237     int    count = qi->qf_lists[which].qf_count;
3238     char_u buf[IOSIZE];
3239 
3240     vim_snprintf((char *)buf, IOSIZE, _("%serror list %d of %d; %d errors "),
3241 	    lead,
3242 	    which + 1,
3243 	    qi->qf_listcount,
3244 	    count);
3245 
3246     if (title != NULL)
3247     {
3248 	size_t	len = STRLEN(buf);
3249 
3250 	if (len < 34)
3251 	{
3252 	    vim_memset(buf + len, ' ', 34 - len);
3253 	    buf[34] = NUL;
3254 	}
3255 	vim_strcat(buf, (char_u *)title, IOSIZE);
3256     }
3257     trunc_string(buf, buf, Columns - 1, IOSIZE);
3258     msg(buf);
3259 }
3260 
3261 /*
3262  * ":colder [count]": Up in the quickfix stack.
3263  * ":cnewer [count]": Down in the quickfix stack.
3264  * ":lolder [count]": Up in the location list stack.
3265  * ":lnewer [count]": Down in the location list stack.
3266  */
3267     void
3268 qf_age(exarg_T *eap)
3269 {
3270     qf_info_T	*qi = &ql_info;
3271     int		count;
3272 
3273     if (eap->cmdidx == CMD_lolder || eap->cmdidx == CMD_lnewer)
3274     {
3275 	qi = GET_LOC_LIST(curwin);
3276 	if (qi == NULL)
3277 	{
3278 	    EMSG(_(e_loclist));
3279 	    return;
3280 	}
3281     }
3282 
3283     if (eap->addr_count != 0)
3284 	count = eap->line2;
3285     else
3286 	count = 1;
3287     while (count--)
3288     {
3289 	if (eap->cmdidx == CMD_colder || eap->cmdidx == CMD_lolder)
3290 	{
3291 	    if (qi->qf_curlist == 0)
3292 	    {
3293 		EMSG(_("E380: At bottom of quickfix stack"));
3294 		break;
3295 	    }
3296 	    --qi->qf_curlist;
3297 	}
3298 	else
3299 	{
3300 	    if (qi->qf_curlist >= qi->qf_listcount - 1)
3301 	    {
3302 		EMSG(_("E381: At top of quickfix stack"));
3303 		break;
3304 	    }
3305 	    ++qi->qf_curlist;
3306 	}
3307     }
3308     qf_msg(qi, qi->qf_curlist, "");
3309     qf_update_buffer(qi, NULL);
3310 }
3311 
3312 /*
3313  * Display the information about all the quickfix/location lists in the stack
3314  */
3315     void
3316 qf_history(exarg_T *eap)
3317 {
3318     qf_info_T	*qi = &ql_info;
3319     int		i;
3320 
3321     if (eap->cmdidx == CMD_lhistory)
3322 	qi = GET_LOC_LIST(curwin);
3323     if (qi == NULL || (qi->qf_listcount == 0
3324 				&& qi->qf_lists[qi->qf_curlist].qf_count == 0))
3325 	MSG(_("No entries"));
3326     else
3327 	for (i = 0; i < qi->qf_listcount; ++i)
3328 	    qf_msg(qi, i, i == qi->qf_curlist ? "> " : "  ");
3329 }
3330 
3331 /*
3332  * Free all the entries in the error list "idx". Note that other information
3333  * associated with the list like context and title are not freed.
3334  */
3335     static void
3336 qf_free_items(qf_info_T *qi, int idx)
3337 {
3338     qfline_T	*qfp;
3339     qfline_T	*qfpnext;
3340     int		stop = FALSE;
3341     qf_list_T	*qfl = &qi->qf_lists[idx];
3342 
3343     while (qfl->qf_count && qfl->qf_start != NULL)
3344     {
3345 	qfp = qfl->qf_start;
3346 	qfpnext = qfp->qf_next;
3347 	if (!stop)
3348 	{
3349 	    vim_free(qfp->qf_module);
3350 	    vim_free(qfp->qf_text);
3351 	    vim_free(qfp->qf_pattern);
3352 	    stop = (qfp == qfpnext);
3353 	    vim_free(qfp);
3354 	    if (stop)
3355 		/* Somehow qf_count may have an incorrect value, set it to 1
3356 		 * to avoid crashing when it's wrong.
3357 		 * TODO: Avoid qf_count being incorrect. */
3358 		qfl->qf_count = 1;
3359 	}
3360 	qfl->qf_start = qfpnext;
3361 	--qfl->qf_count;
3362     }
3363 
3364     qfl->qf_index = 0;
3365     qfl->qf_start = NULL;
3366     qfl->qf_last = NULL;
3367     qfl->qf_ptr = NULL;
3368     qfl->qf_nonevalid = TRUE;
3369 
3370     qf_clean_dir_stack(&qfl->qf_dir_stack);
3371     qfl->qf_directory = NULL;
3372     qf_clean_dir_stack(&qfl->qf_file_stack);
3373     qfl->qf_currfile = NULL;
3374     qfl->qf_multiline = FALSE;
3375     qfl->qf_multiignore = FALSE;
3376     qfl->qf_multiscan = FALSE;
3377 }
3378 
3379 /*
3380  * Free error list "idx". Frees all the entries in the quickfix list,
3381  * associated context information and the title.
3382  */
3383     static void
3384 qf_free(qf_info_T *qi, int idx)
3385 {
3386     qf_list_T	*qfl = &qi->qf_lists[idx];
3387 
3388     qf_free_items(qi, idx);
3389 
3390     VIM_CLEAR(qfl->qf_title);
3391     free_tv(qfl->qf_ctx);
3392     qfl->qf_ctx = NULL;
3393     qfl->qf_id = 0;
3394     qfl->qf_changedtick = 0L;
3395 }
3396 
3397 /*
3398  * qf_mark_adjust: adjust marks
3399  */
3400    void
3401 qf_mark_adjust(
3402 	win_T	*wp,
3403 	linenr_T	line1,
3404 	linenr_T	line2,
3405 	long	amount,
3406 	long	amount_after)
3407 {
3408     int		i;
3409     qfline_T	*qfp;
3410     int		idx;
3411     qf_info_T	*qi = &ql_info;
3412     int		found_one = FALSE;
3413     int		buf_has_flag = wp == NULL ? BUF_HAS_QF_ENTRY : BUF_HAS_LL_ENTRY;
3414 
3415     if (!(curbuf->b_has_qf_entry & buf_has_flag))
3416 	return;
3417     if (wp != NULL)
3418     {
3419 	if (wp->w_llist == NULL)
3420 	    return;
3421 	qi = wp->w_llist;
3422     }
3423 
3424     for (idx = 0; idx < qi->qf_listcount; ++idx)
3425 	if (qi->qf_lists[idx].qf_count)
3426 	    for (i = 0, qfp = qi->qf_lists[idx].qf_start;
3427 			i < qi->qf_lists[idx].qf_count && qfp != NULL;
3428 			++i, qfp = qfp->qf_next)
3429 		if (qfp->qf_fnum == curbuf->b_fnum)
3430 		{
3431 		    found_one = TRUE;
3432 		    if (qfp->qf_lnum >= line1 && qfp->qf_lnum <= line2)
3433 		    {
3434 			if (amount == MAXLNUM)
3435 			    qfp->qf_cleared = TRUE;
3436 			else
3437 			    qfp->qf_lnum += amount;
3438 		    }
3439 		    else if (amount_after && qfp->qf_lnum > line2)
3440 			qfp->qf_lnum += amount_after;
3441 		}
3442 
3443     if (!found_one)
3444 	curbuf->b_has_qf_entry &= ~buf_has_flag;
3445 }
3446 
3447 /*
3448  * Make a nice message out of the error character and the error number:
3449  *  char    number	message
3450  *  e or E    0		" error"
3451  *  w or W    0		" warning"
3452  *  i or I    0		" info"
3453  *  0	      0		""
3454  *  other     0		" c"
3455  *  e or E    n		" error n"
3456  *  w or W    n		" warning n"
3457  *  i or I    n		" info n"
3458  *  0	      n		" error n"
3459  *  other     n		" c n"
3460  *  1	      x		""	:helpgrep
3461  */
3462     static char_u *
3463 qf_types(int c, int nr)
3464 {
3465     static char_u	buf[20];
3466     static char_u	cc[3];
3467     char_u		*p;
3468 
3469     if (c == 'W' || c == 'w')
3470 	p = (char_u *)" warning";
3471     else if (c == 'I' || c == 'i')
3472 	p = (char_u *)" info";
3473     else if (c == 'E' || c == 'e' || (c == 0 && nr > 0))
3474 	p = (char_u *)" error";
3475     else if (c == 0 || c == 1)
3476 	p = (char_u *)"";
3477     else
3478     {
3479 	cc[0] = ' ';
3480 	cc[1] = c;
3481 	cc[2] = NUL;
3482 	p = cc;
3483     }
3484 
3485     if (nr <= 0)
3486 	return p;
3487 
3488     sprintf((char *)buf, "%s %3d", (char *)p, nr);
3489     return buf;
3490 }
3491 
3492 /*
3493  * ":cwindow": open the quickfix window if we have errors to display,
3494  *	       close it if not.
3495  * ":lwindow": open the location list window if we have locations to display,
3496  *	       close it if not.
3497  */
3498     void
3499 ex_cwindow(exarg_T *eap)
3500 {
3501     qf_info_T	*qi = &ql_info;
3502     win_T	*win;
3503 
3504     if (eap->cmdidx == CMD_lwindow)
3505     {
3506 	qi = GET_LOC_LIST(curwin);
3507 	if (qi == NULL)
3508 	    return;
3509     }
3510 
3511     /* Look for an existing quickfix window.  */
3512     win = qf_find_win(qi);
3513 
3514     /*
3515      * If a quickfix window is open but we have no errors to display,
3516      * close the window.  If a quickfix window is not open, then open
3517      * it if we have errors; otherwise, leave it closed.
3518      */
3519     if (qi->qf_lists[qi->qf_curlist].qf_nonevalid
3520 	    || qi->qf_lists[qi->qf_curlist].qf_count == 0
3521 	    || qi->qf_curlist >= qi->qf_listcount)
3522     {
3523 	if (win != NULL)
3524 	    ex_cclose(eap);
3525     }
3526     else if (win == NULL)
3527 	ex_copen(eap);
3528 }
3529 
3530 /*
3531  * ":cclose": close the window showing the list of errors.
3532  * ":lclose": close the window showing the location list
3533  */
3534     void
3535 ex_cclose(exarg_T *eap)
3536 {
3537     win_T	*win = NULL;
3538     qf_info_T	*qi = &ql_info;
3539 
3540     if (eap->cmdidx == CMD_lclose || eap->cmdidx == CMD_lwindow)
3541     {
3542 	qi = GET_LOC_LIST(curwin);
3543 	if (qi == NULL)
3544 	    return;
3545     }
3546 
3547     /* Find existing quickfix window and close it. */
3548     win = qf_find_win(qi);
3549     if (win != NULL)
3550 	win_close(win, FALSE);
3551 }
3552 
3553 /*
3554  * ":copen": open a window that shows the list of errors.
3555  * ":lopen": open a window that shows the location list.
3556  */
3557     void
3558 ex_copen(exarg_T *eap)
3559 {
3560     qf_info_T	*qi = &ql_info;
3561     int		height;
3562     win_T	*win;
3563     tabpage_T	*prevtab = curtab;
3564     buf_T	*qf_buf;
3565     win_T	*oldwin = curwin;
3566 
3567     if (eap->cmdidx == CMD_lopen || eap->cmdidx == CMD_lwindow)
3568     {
3569 	qi = GET_LOC_LIST(curwin);
3570 	if (qi == NULL)
3571 	{
3572 	    EMSG(_(e_loclist));
3573 	    return;
3574 	}
3575     }
3576 
3577     if (eap->addr_count != 0)
3578 	height = eap->line2;
3579     else
3580 	height = QF_WINHEIGHT;
3581 
3582     reset_VIsual_and_resel();			/* stop Visual mode */
3583 #ifdef FEAT_GUI
3584     need_mouse_correct = TRUE;
3585 #endif
3586 
3587     /*
3588      * Find existing quickfix window, or open a new one.
3589      */
3590     win = qf_find_win(qi);
3591 
3592     if (win != NULL && cmdmod.tab == 0)
3593     {
3594 	win_goto(win);
3595 	if (eap->addr_count != 0)
3596 	{
3597 	    if (cmdmod.split & WSP_VERT)
3598 	    {
3599 		if (height != win->w_width)
3600 		    win_setwidth(height);
3601 	    }
3602 	    else if (height != win->w_height)
3603 		win_setheight(height);
3604 	}
3605     }
3606     else
3607     {
3608 	int flags = 0;
3609 
3610 	qf_buf = qf_find_buf(qi);
3611 
3612 	/* The current window becomes the previous window afterwards. */
3613 	win = curwin;
3614 
3615 	if ((eap->cmdidx == CMD_copen || eap->cmdidx == CMD_cwindow)
3616 		&& cmdmod.split == 0)
3617 	    /* Create the new quickfix window at the very bottom, except when
3618 	     * :belowright or :aboveleft is used. */
3619 	    win_goto(lastwin);
3620 	/* Default is to open the window below the current window */
3621 	if (cmdmod.split == 0)
3622 	    flags = WSP_BELOW;
3623 	flags |= WSP_NEWLOC;
3624 	if (win_split(height, flags) == FAIL)
3625 	    return;		/* not enough room for window */
3626 	RESET_BINDING(curwin);
3627 
3628 	if (eap->cmdidx == CMD_lopen || eap->cmdidx == CMD_lwindow)
3629 	{
3630 	    /*
3631 	     * For the location list window, create a reference to the
3632 	     * location list from the window 'win'.
3633 	     */
3634 	    curwin->w_llist_ref = win->w_llist;
3635 	    win->w_llist->qf_refcount++;
3636 	}
3637 
3638 	if (oldwin != curwin)
3639 	    oldwin = NULL;  /* don't store info when in another window */
3640 	if (qf_buf != NULL)
3641 	    /* Use the existing quickfix buffer */
3642 	    (void)do_ecmd(qf_buf->b_fnum, NULL, NULL, NULL, ECMD_ONE,
3643 					     ECMD_HIDE + ECMD_OLDBUF, oldwin);
3644 	else
3645 	{
3646 	    /* Create a new quickfix buffer */
3647 	    (void)do_ecmd(0, NULL, NULL, NULL, ECMD_ONE, ECMD_HIDE, oldwin);
3648 	    /* switch off 'swapfile' */
3649 	    set_option_value((char_u *)"swf", 0L, NULL, OPT_LOCAL);
3650 	    set_option_value((char_u *)"bt", 0L, (char_u *)"quickfix",
3651 								   OPT_LOCAL);
3652 	    set_option_value((char_u *)"bh", 0L, (char_u *)"wipe", OPT_LOCAL);
3653 	    RESET_BINDING(curwin);
3654 #ifdef FEAT_DIFF
3655 	    curwin->w_p_diff = FALSE;
3656 #endif
3657 #ifdef FEAT_FOLDING
3658 	    set_option_value((char_u *)"fdm", 0L, (char_u *)"manual",
3659 								   OPT_LOCAL);
3660 #endif
3661 	}
3662 
3663 	/* Only set the height when still in the same tab page and there is no
3664 	 * window to the side. */
3665 	if (curtab == prevtab && curwin->w_width == Columns)
3666 	    win_setheight(height);
3667 	curwin->w_p_wfh = TRUE;	    /* set 'winfixheight' */
3668 	if (win_valid(win))
3669 	    prevwin = win;
3670     }
3671 
3672     qf_set_title_var(qi);
3673 
3674     /*
3675      * Fill the buffer with the quickfix list.
3676      */
3677     qf_fill_buffer(qi, curbuf, NULL);
3678 
3679     curwin->w_cursor.lnum = qi->qf_lists[qi->qf_curlist].qf_index;
3680     curwin->w_cursor.col = 0;
3681     check_cursor();
3682     update_topline();		/* scroll to show the line */
3683 }
3684 
3685 /*
3686  * Move the cursor in the quickfix window to "lnum".
3687  */
3688     static void
3689 qf_win_goto(win_T *win, linenr_T lnum)
3690 {
3691     win_T	*old_curwin = curwin;
3692 
3693     curwin = win;
3694     curbuf = win->w_buffer;
3695     curwin->w_cursor.lnum = lnum;
3696     curwin->w_cursor.col = 0;
3697 #ifdef FEAT_VIRTUALEDIT
3698     curwin->w_cursor.coladd = 0;
3699 #endif
3700     curwin->w_curswant = 0;
3701     update_topline();		/* scroll to show the line */
3702     redraw_later(VALID);
3703     curwin->w_redr_status = TRUE;	/* update ruler */
3704     curwin = old_curwin;
3705     curbuf = curwin->w_buffer;
3706 }
3707 
3708 /*
3709  * :cbottom/:lbottom commands.
3710  */
3711     void
3712 ex_cbottom(exarg_T *eap UNUSED)
3713 {
3714     qf_info_T	*qi = &ql_info;
3715     win_T	*win;
3716 
3717     if (eap->cmdidx == CMD_lbottom)
3718     {
3719 	qi = GET_LOC_LIST(curwin);
3720 	if (qi == NULL)
3721 	{
3722 	    EMSG(_(e_loclist));
3723 	    return;
3724 	}
3725     }
3726 
3727     win = qf_find_win(qi);
3728     if (win != NULL && win->w_cursor.lnum != win->w_buffer->b_ml.ml_line_count)
3729 	qf_win_goto(win, win->w_buffer->b_ml.ml_line_count);
3730 }
3731 
3732 /*
3733  * Return the number of the current entry (line number in the quickfix
3734  * window).
3735  */
3736      linenr_T
3737 qf_current_entry(win_T *wp)
3738 {
3739     qf_info_T	*qi = &ql_info;
3740 
3741     if (IS_LL_WINDOW(wp))
3742 	/* In the location list window, use the referenced location list */
3743 	qi = wp->w_llist_ref;
3744 
3745     return qi->qf_lists[qi->qf_curlist].qf_index;
3746 }
3747 
3748 /*
3749  * Update the cursor position in the quickfix window to the current error.
3750  * Return TRUE if there is a quickfix window.
3751  */
3752     static int
3753 qf_win_pos_update(
3754     qf_info_T	*qi,
3755     int		old_qf_index)	/* previous qf_index or zero */
3756 {
3757     win_T	*win;
3758     int		qf_index = qi->qf_lists[qi->qf_curlist].qf_index;
3759 
3760     /*
3761      * Put the cursor on the current error in the quickfix window, so that
3762      * it's viewable.
3763      */
3764     win = qf_find_win(qi);
3765     if (win != NULL
3766 	    && qf_index <= win->w_buffer->b_ml.ml_line_count
3767 	    && old_qf_index != qf_index)
3768     {
3769 	if (qf_index > old_qf_index)
3770 	{
3771 	    win->w_redraw_top = old_qf_index;
3772 	    win->w_redraw_bot = qf_index;
3773 	}
3774 	else
3775 	{
3776 	    win->w_redraw_top = qf_index;
3777 	    win->w_redraw_bot = old_qf_index;
3778 	}
3779 	qf_win_goto(win, qf_index);
3780     }
3781     return win != NULL;
3782 }
3783 
3784 /*
3785  * Check whether the given window is displaying the specified quickfix/location
3786  * list buffer
3787  */
3788     static int
3789 is_qf_win(win_T *win, qf_info_T *qi)
3790 {
3791     /*
3792      * A window displaying the quickfix buffer will have the w_llist_ref field
3793      * set to NULL.
3794      * A window displaying a location list buffer will have the w_llist_ref
3795      * pointing to the location list.
3796      */
3797     if (bt_quickfix(win->w_buffer))
3798 	if ((qi == &ql_info && win->w_llist_ref == NULL)
3799 		|| (qi != &ql_info && win->w_llist_ref == qi))
3800 	    return TRUE;
3801 
3802     return FALSE;
3803 }
3804 
3805 /*
3806  * Find a window displaying the quickfix/location list 'qi'
3807  * Only searches in the current tabpage.
3808  */
3809     static win_T *
3810 qf_find_win(qf_info_T *qi)
3811 {
3812     win_T	*win;
3813 
3814     FOR_ALL_WINDOWS(win)
3815 	if (is_qf_win(win, qi))
3816 	    return win;
3817     return NULL;
3818 }
3819 
3820 /*
3821  * Find a quickfix buffer.
3822  * Searches in windows opened in all the tabs.
3823  */
3824     static buf_T *
3825 qf_find_buf(qf_info_T *qi)
3826 {
3827     tabpage_T	*tp;
3828     win_T	*win;
3829 
3830     FOR_ALL_TAB_WINDOWS(tp, win)
3831 	if (is_qf_win(win, qi))
3832 	    return win->w_buffer;
3833 
3834     return NULL;
3835 }
3836 
3837 /*
3838  * Update the w:quickfix_title variable in the quickfix/location list window
3839  */
3840     static void
3841 qf_update_win_titlevar(qf_info_T *qi)
3842 {
3843     win_T	*win;
3844     win_T	*curwin_save;
3845 
3846     if ((win = qf_find_win(qi)) != NULL)
3847     {
3848 	curwin_save = curwin;
3849 	curwin = win;
3850 	qf_set_title_var(qi);
3851 	curwin = curwin_save;
3852     }
3853 }
3854 
3855 /*
3856  * Find the quickfix buffer.  If it exists, update the contents.
3857  */
3858     static void
3859 qf_update_buffer(qf_info_T *qi, qfline_T *old_last)
3860 {
3861     buf_T	*buf;
3862     win_T	*win;
3863     aco_save_T	aco;
3864 
3865     /* Check if a buffer for the quickfix list exists.  Update it. */
3866     buf = qf_find_buf(qi);
3867     if (buf != NULL)
3868     {
3869 	linenr_T	old_line_count = buf->b_ml.ml_line_count;
3870 
3871 	if (old_last == NULL)
3872 	    /* set curwin/curbuf to buf and save a few things */
3873 	    aucmd_prepbuf(&aco, buf);
3874 
3875 	qf_update_win_titlevar(qi);
3876 
3877 	qf_fill_buffer(qi, buf, old_last);
3878 	++CHANGEDTICK(buf);
3879 
3880 	if (old_last == NULL)
3881 	{
3882 	    (void)qf_win_pos_update(qi, 0);
3883 
3884 	    /* restore curwin/curbuf and a few other things */
3885 	    aucmd_restbuf(&aco);
3886 	}
3887 
3888 	/* Only redraw when added lines are visible.  This avoids flickering
3889 	 * when the added lines are not visible. */
3890 	if ((win = qf_find_win(qi)) != NULL && old_line_count < win->w_botline)
3891 	    redraw_buf_later(buf, NOT_VALID);
3892     }
3893 }
3894 
3895 /*
3896  * Set "w:quickfix_title" if "qi" has a title.
3897  */
3898     static void
3899 qf_set_title_var(qf_info_T *qi)
3900 {
3901     if (qi->qf_lists[qi->qf_curlist].qf_title != NULL)
3902 	set_internal_string_var((char_u *)"w:quickfix_title",
3903 				    qi->qf_lists[qi->qf_curlist].qf_title);
3904 }
3905 
3906 /*
3907  * Add an error line to the quickfix buffer.
3908  */
3909     static int
3910 qf_buf_add_line(buf_T *buf, linenr_T lnum, qfline_T *qfp, char_u *dirname)
3911 {
3912     int		len;
3913     buf_T	*errbuf;
3914 
3915     if (qfp->qf_module != NULL)
3916     {
3917 	STRCPY(IObuff, qfp->qf_module);
3918 	len = (int)STRLEN(IObuff);
3919     }
3920     else if (qfp->qf_fnum != 0
3921 	    && (errbuf = buflist_findnr(qfp->qf_fnum)) != NULL
3922 	    && errbuf->b_fname != NULL)
3923     {
3924 	if (qfp->qf_type == 1)	/* :helpgrep */
3925 	    STRCPY(IObuff, gettail(errbuf->b_fname));
3926 	else
3927 	{
3928 	    /* shorten the file name if not done already */
3929 	    if (errbuf->b_sfname == NULL
3930 		    || mch_isFullName(errbuf->b_sfname))
3931 	    {
3932 		if (*dirname == NUL)
3933 		    mch_dirname(dirname, MAXPATHL);
3934 		shorten_buf_fname(errbuf, dirname, FALSE);
3935 	    }
3936 	    STRCPY(IObuff, errbuf->b_fname);
3937 	}
3938 	len = (int)STRLEN(IObuff);
3939     }
3940     else
3941 	len = 0;
3942     IObuff[len++] = '|';
3943 
3944     if (qfp->qf_lnum > 0)
3945     {
3946 	sprintf((char *)IObuff + len, "%ld", qfp->qf_lnum);
3947 	len += (int)STRLEN(IObuff + len);
3948 
3949 	if (qfp->qf_col > 0)
3950 	{
3951 	    sprintf((char *)IObuff + len, " col %d", qfp->qf_col);
3952 	    len += (int)STRLEN(IObuff + len);
3953 	}
3954 
3955 	sprintf((char *)IObuff + len, "%s",
3956 		(char *)qf_types(qfp->qf_type, qfp->qf_nr));
3957 	len += (int)STRLEN(IObuff + len);
3958     }
3959     else if (qfp->qf_pattern != NULL)
3960     {
3961 	qf_fmt_text(qfp->qf_pattern, IObuff + len, IOSIZE - len);
3962 	len += (int)STRLEN(IObuff + len);
3963     }
3964     IObuff[len++] = '|';
3965     IObuff[len++] = ' ';
3966 
3967     /* Remove newlines and leading whitespace from the text.
3968      * For an unrecognized line keep the indent, the compiler may
3969      * mark a word with ^^^^. */
3970     qf_fmt_text(len > 3 ? skipwhite(qfp->qf_text) : qfp->qf_text,
3971 	    IObuff + len, IOSIZE - len);
3972 
3973     if (ml_append_buf(buf, lnum, IObuff,
3974 		(colnr_T)STRLEN(IObuff) + 1, FALSE) == FAIL)
3975 	return FAIL;
3976 
3977     return OK;
3978 }
3979 
3980 /*
3981  * Fill current buffer with quickfix errors, replacing any previous contents.
3982  * curbuf must be the quickfix buffer!
3983  * If "old_last" is not NULL append the items after this one.
3984  * When "old_last" is NULL then "buf" must equal "curbuf"!  Because
3985  * ml_delete() is used and autocommands will be triggered.
3986  */
3987     static void
3988 qf_fill_buffer(qf_info_T *qi, buf_T *buf, qfline_T *old_last)
3989 {
3990     linenr_T	lnum;
3991     qfline_T	*qfp;
3992     int		old_KeyTyped = KeyTyped;
3993 
3994     if (old_last == NULL)
3995     {
3996 	if (buf != curbuf)
3997 	{
3998 	    internal_error("qf_fill_buffer()");
3999 	    return;
4000 	}
4001 
4002 	/* delete all existing lines */
4003 	while ((curbuf->b_ml.ml_flags & ML_EMPTY) == 0)
4004 	    (void)ml_delete((linenr_T)1, FALSE);
4005     }
4006 
4007     /* Check if there is anything to display */
4008     if (qi->qf_curlist < qi->qf_listcount)
4009     {
4010 	char_u	dirname[MAXPATHL];
4011 
4012 	*dirname = NUL;
4013 
4014 	/* Add one line for each error */
4015 	if (old_last == NULL)
4016 	{
4017 	    qfp = qi->qf_lists[qi->qf_curlist].qf_start;
4018 	    lnum = 0;
4019 	}
4020 	else
4021 	{
4022 	    qfp = old_last->qf_next;
4023 	    lnum = buf->b_ml.ml_line_count;
4024 	}
4025 	while (lnum < qi->qf_lists[qi->qf_curlist].qf_count)
4026 	{
4027 	    if (qf_buf_add_line(buf, lnum, qfp, dirname) == FAIL)
4028 		break;
4029 
4030 	    ++lnum;
4031 	    qfp = qfp->qf_next;
4032 	    if (qfp == NULL)
4033 		break;
4034 	}
4035 
4036 	if (old_last == NULL)
4037 	    /* Delete the empty line which is now at the end */
4038 	    (void)ml_delete(lnum + 1, FALSE);
4039     }
4040 
4041     /* correct cursor position */
4042     check_lnums(TRUE);
4043 
4044     if (old_last == NULL)
4045     {
4046 	/* Set the 'filetype' to "qf" each time after filling the buffer.
4047 	 * This resembles reading a file into a buffer, it's more logical when
4048 	 * using autocommands. */
4049 	++curbuf_lock;
4050 	set_option_value((char_u *)"ft", 0L, (char_u *)"qf", OPT_LOCAL);
4051 	curbuf->b_p_ma = FALSE;
4052 
4053 	keep_filetype = TRUE;		/* don't detect 'filetype' */
4054 	apply_autocmds(EVENT_BUFREADPOST, (char_u *)"quickfix", NULL,
4055 							       FALSE, curbuf);
4056 	apply_autocmds(EVENT_BUFWINENTER, (char_u *)"quickfix", NULL,
4057 							       FALSE, curbuf);
4058 	keep_filetype = FALSE;
4059 	--curbuf_lock;
4060 
4061 	/* make sure it will be redrawn */
4062 	redraw_curbuf_later(NOT_VALID);
4063     }
4064 
4065     /* Restore KeyTyped, setting 'filetype' may reset it. */
4066     KeyTyped = old_KeyTyped;
4067 }
4068 
4069 /*
4070  * For every change made to the quickfix list, update the changed tick.
4071  */
4072     static void
4073 qf_list_changed(qf_info_T *qi, int qf_idx)
4074 {
4075     qi->qf_lists[qf_idx].qf_changedtick++;
4076 }
4077 
4078 /*
4079  * Return the quickfix/location list number with the given identifier.
4080  * Returns -1 if list is not found.
4081  */
4082     static int
4083 qf_id2nr(qf_info_T *qi, int_u qfid)
4084 {
4085     int		qf_idx;
4086 
4087     for (qf_idx = 0; qf_idx < qi->qf_listcount; qf_idx++)
4088 	if (qi->qf_lists[qf_idx].qf_id == qfid)
4089 	    return qf_idx;
4090     return INVALID_QFIDX;
4091 }
4092 
4093 /*
4094  * Return TRUE when using ":vimgrep" for ":grep".
4095  */
4096     int
4097 grep_internal(cmdidx_T cmdidx)
4098 {
4099     return ((cmdidx == CMD_grep
4100 		|| cmdidx == CMD_lgrep
4101 		|| cmdidx == CMD_grepadd
4102 		|| cmdidx == CMD_lgrepadd)
4103 	    && STRCMP("internal",
4104 			*curbuf->b_p_gp == NUL ? p_gp : curbuf->b_p_gp) == 0);
4105 }
4106 
4107 /*
4108  * Used for ":make", ":lmake", ":grep", ":lgrep", ":grepadd", and ":lgrepadd"
4109  */
4110     void
4111 ex_make(exarg_T *eap)
4112 {
4113     char_u	*fname;
4114     char_u	*cmd;
4115     char_u	*enc = NULL;
4116     unsigned	len;
4117     win_T	*wp = NULL;
4118     qf_info_T	*qi = &ql_info;
4119     int		res;
4120     char_u	*au_name = NULL;
4121     int_u	save_qfid;
4122 
4123     /* Redirect ":grep" to ":vimgrep" if 'grepprg' is "internal". */
4124     if (grep_internal(eap->cmdidx))
4125     {
4126 	ex_vimgrep(eap);
4127 	return;
4128     }
4129 
4130     switch (eap->cmdidx)
4131     {
4132 	case CMD_make:	    au_name = (char_u *)"make"; break;
4133 	case CMD_lmake:	    au_name = (char_u *)"lmake"; break;
4134 	case CMD_grep:	    au_name = (char_u *)"grep"; break;
4135 	case CMD_lgrep:	    au_name = (char_u *)"lgrep"; break;
4136 	case CMD_grepadd:   au_name = (char_u *)"grepadd"; break;
4137 	case CMD_lgrepadd:  au_name = (char_u *)"lgrepadd"; break;
4138 	default: break;
4139     }
4140     if (au_name != NULL && apply_autocmds(EVENT_QUICKFIXCMDPRE, au_name,
4141 					       curbuf->b_fname, TRUE, curbuf))
4142     {
4143 #ifdef FEAT_EVAL
4144 	if (aborting())
4145 	    return;
4146 #endif
4147     }
4148 #ifdef FEAT_MBYTE
4149     enc = (*curbuf->b_p_menc != NUL) ? curbuf->b_p_menc : p_menc;
4150 #endif
4151 
4152     if (eap->cmdidx == CMD_lmake || eap->cmdidx == CMD_lgrep
4153 	|| eap->cmdidx == CMD_lgrepadd)
4154 	wp = curwin;
4155 
4156     autowrite_all();
4157     fname = get_mef_name();
4158     if (fname == NULL)
4159 	return;
4160     mch_remove(fname);	    /* in case it's not unique */
4161 
4162     /*
4163      * If 'shellpipe' empty: don't redirect to 'errorfile'.
4164      */
4165     len = (unsigned)STRLEN(p_shq) * 2 + (unsigned)STRLEN(eap->arg) + 1;
4166     if (*p_sp != NUL)
4167 	len += (unsigned)STRLEN(p_sp) + (unsigned)STRLEN(fname) + 3;
4168     cmd = alloc(len);
4169     if (cmd == NULL)
4170 	return;
4171     sprintf((char *)cmd, "%s%s%s", (char *)p_shq, (char *)eap->arg,
4172 							       (char *)p_shq);
4173     if (*p_sp != NUL)
4174 	append_redir(cmd, len, p_sp, fname);
4175     /*
4176      * Output a newline if there's something else than the :make command that
4177      * was typed (in which case the cursor is in column 0).
4178      */
4179     if (msg_col == 0)
4180 	msg_didout = FALSE;
4181     msg_start();
4182     MSG_PUTS(":!");
4183     msg_outtrans(cmd);		/* show what we are doing */
4184 
4185     /* let the shell know if we are redirecting output or not */
4186     do_shell(cmd, *p_sp != NUL ? SHELL_DOOUT : 0);
4187 
4188 #ifdef AMIGA
4189     out_flush();
4190 		/* read window status report and redraw before message */
4191     (void)char_avail();
4192 #endif
4193 
4194     res = qf_init(wp, fname, (eap->cmdidx != CMD_make
4195 			    && eap->cmdidx != CMD_lmake) ? p_gefm : p_efm,
4196 					   (eap->cmdidx != CMD_grepadd
4197 					    && eap->cmdidx != CMD_lgrepadd),
4198 					   qf_cmdtitle(*eap->cmdlinep), enc);
4199     if (wp != NULL)
4200     {
4201 	qi = GET_LOC_LIST(wp);
4202 	if (qi == NULL)
4203 	    goto cleanup;
4204     }
4205     if (res >= 0)
4206 	qf_list_changed(qi, qi->qf_curlist);
4207 
4208     // Remember the current quickfix list identifier, so that we can
4209     // check for autocommands changing the current quickfix list.
4210     save_qfid = qi->qf_lists[qi->qf_curlist].qf_id;
4211     if (au_name != NULL)
4212 	apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
4213 					       curbuf->b_fname, TRUE, curbuf);
4214     if (res > 0 && !eap->forceit && qflist_valid(wp, save_qfid))
4215     {
4216 	// If autocommands changed the current list, then restore it
4217 	if (qi->qf_lists[qi->qf_curlist].qf_id != save_qfid)
4218 	    qi->qf_curlist = qf_id2nr(qi, save_qfid);
4219 	qf_jump(qi, 0, 0, FALSE);		/* display first error */
4220     }
4221 
4222 cleanup:
4223     mch_remove(fname);
4224     vim_free(fname);
4225     vim_free(cmd);
4226 }
4227 
4228 /*
4229  * Return the name for the errorfile, in allocated memory.
4230  * Find a new unique name when 'makeef' contains "##".
4231  * Returns NULL for error.
4232  */
4233     static char_u *
4234 get_mef_name(void)
4235 {
4236     char_u	*p;
4237     char_u	*name;
4238     static int	start = -1;
4239     static int	off = 0;
4240 #ifdef HAVE_LSTAT
4241     stat_T	sb;
4242 #endif
4243 
4244     if (*p_mef == NUL)
4245     {
4246 	name = vim_tempname('e', FALSE);
4247 	if (name == NULL)
4248 	    EMSG(_(e_notmp));
4249 	return name;
4250     }
4251 
4252     for (p = p_mef; *p; ++p)
4253 	if (p[0] == '#' && p[1] == '#')
4254 	    break;
4255 
4256     if (*p == NUL)
4257 	return vim_strsave(p_mef);
4258 
4259     /* Keep trying until the name doesn't exist yet. */
4260     for (;;)
4261     {
4262 	if (start == -1)
4263 	    start = mch_get_pid();
4264 	else
4265 	    off += 19;
4266 
4267 	name = alloc((unsigned)STRLEN(p_mef) + 30);
4268 	if (name == NULL)
4269 	    break;
4270 	STRCPY(name, p_mef);
4271 	sprintf((char *)name + (p - p_mef), "%d%d", start, off);
4272 	STRCAT(name, p + 2);
4273 	if (mch_getperm(name) < 0
4274 #ifdef HAVE_LSTAT
4275 		    /* Don't accept a symbolic link, it's a security risk. */
4276 		    && mch_lstat((char *)name, &sb) < 0
4277 #endif
4278 		)
4279 	    break;
4280 	vim_free(name);
4281     }
4282     return name;
4283 }
4284 
4285 /*
4286  * Returns the number of valid entries in the current quickfix/location list.
4287  */
4288     int
4289 qf_get_size(exarg_T *eap)
4290 {
4291     qf_info_T	*qi = &ql_info;
4292     qfline_T	*qfp;
4293     int		i, sz = 0;
4294     int		prev_fnum = 0;
4295 
4296     if (eap->cmdidx == CMD_ldo || eap->cmdidx == CMD_lfdo)
4297     {
4298 	/* Location list */
4299 	qi = GET_LOC_LIST(curwin);
4300 	if (qi == NULL)
4301 	    return 0;
4302     }
4303 
4304     for (i = 0, qfp = qi->qf_lists[qi->qf_curlist].qf_start;
4305 	    i < qi->qf_lists[qi->qf_curlist].qf_count && qfp != NULL;
4306 	    ++i, qfp = qfp->qf_next)
4307     {
4308 	if (qfp->qf_valid)
4309 	{
4310 	    if (eap->cmdidx == CMD_cdo || eap->cmdidx == CMD_ldo)
4311 		sz++;	/* Count all valid entries */
4312 	    else if (qfp->qf_fnum > 0 && qfp->qf_fnum != prev_fnum)
4313 	    {
4314 		/* Count the number of files */
4315 		sz++;
4316 		prev_fnum = qfp->qf_fnum;
4317 	    }
4318 	}
4319     }
4320 
4321     return sz;
4322 }
4323 
4324 /*
4325  * Returns the current index of the quickfix/location list.
4326  * Returns 0 if there is an error.
4327  */
4328     int
4329 qf_get_cur_idx(exarg_T *eap)
4330 {
4331     qf_info_T	*qi = &ql_info;
4332 
4333     if (eap->cmdidx == CMD_ldo || eap->cmdidx == CMD_lfdo)
4334     {
4335 	/* Location list */
4336 	qi = GET_LOC_LIST(curwin);
4337 	if (qi == NULL)
4338 	    return 0;
4339     }
4340 
4341     return qi->qf_lists[qi->qf_curlist].qf_index;
4342 }
4343 
4344 /*
4345  * Returns the current index in the quickfix/location list (counting only valid
4346  * entries). If no valid entries are in the list, then returns 1.
4347  */
4348     int
4349 qf_get_cur_valid_idx(exarg_T *eap)
4350 {
4351     qf_info_T	*qi = &ql_info;
4352     qf_list_T	*qfl;
4353     qfline_T	*qfp;
4354     int		i, eidx = 0;
4355     int		prev_fnum = 0;
4356 
4357     if (eap->cmdidx == CMD_ldo || eap->cmdidx == CMD_lfdo)
4358     {
4359 	/* Location list */
4360 	qi = GET_LOC_LIST(curwin);
4361 	if (qi == NULL)
4362 	    return 1;
4363     }
4364 
4365     qfl = &qi->qf_lists[qi->qf_curlist];
4366     qfp = qfl->qf_start;
4367 
4368     /* check if the list has valid errors */
4369     if (qfl->qf_count <= 0 || qfl->qf_nonevalid)
4370 	return 1;
4371 
4372     for (i = 1; i <= qfl->qf_index && qfp!= NULL; i++, qfp = qfp->qf_next)
4373     {
4374 	if (qfp->qf_valid)
4375 	{
4376 	    if (eap->cmdidx == CMD_cfdo || eap->cmdidx == CMD_lfdo)
4377 	    {
4378 		if (qfp->qf_fnum > 0 && qfp->qf_fnum != prev_fnum)
4379 		{
4380 		    /* Count the number of files */
4381 		    eidx++;
4382 		    prev_fnum = qfp->qf_fnum;
4383 		}
4384 	    }
4385 	    else
4386 		eidx++;
4387 	}
4388     }
4389 
4390     return eidx ? eidx : 1;
4391 }
4392 
4393 /*
4394  * Get the 'n'th valid error entry in the quickfix or location list.
4395  * Used by :cdo, :ldo, :cfdo and :lfdo commands.
4396  * For :cdo and :ldo returns the 'n'th valid error entry.
4397  * For :cfdo and :lfdo returns the 'n'th valid file entry.
4398  */
4399     static int
4400 qf_get_nth_valid_entry(qf_info_T *qi, int n, int fdo)
4401 {
4402     qf_list_T	*qfl = &qi->qf_lists[qi->qf_curlist];
4403     qfline_T	*qfp = qfl->qf_start;
4404     int		i, eidx;
4405     int		prev_fnum = 0;
4406 
4407     /* check if the list has valid errors */
4408     if (qfl->qf_count <= 0 || qfl->qf_nonevalid)
4409 	return 1;
4410 
4411     for (i = 1, eidx = 0; i <= qfl->qf_count && qfp != NULL;
4412 	    i++, qfp = qfp->qf_next)
4413     {
4414 	if (qfp->qf_valid)
4415 	{
4416 	    if (fdo)
4417 	    {
4418 		if (qfp->qf_fnum > 0 && qfp->qf_fnum != prev_fnum)
4419 		{
4420 		    /* Count the number of files */
4421 		    eidx++;
4422 		    prev_fnum = qfp->qf_fnum;
4423 		}
4424 	    }
4425 	    else
4426 		eidx++;
4427 	}
4428 
4429 	if (eidx == n)
4430 	    break;
4431     }
4432 
4433     if (i <= qfl->qf_count)
4434 	return i;
4435     else
4436 	return 1;
4437 }
4438 
4439 /*
4440  * ":cc", ":crewind", ":cfirst" and ":clast".
4441  * ":ll", ":lrewind", ":lfirst" and ":llast".
4442  * ":cdo", ":ldo", ":cfdo" and ":lfdo"
4443  */
4444     void
4445 ex_cc(exarg_T *eap)
4446 {
4447     qf_info_T	*qi = &ql_info;
4448     int		errornr;
4449 
4450     if (eap->cmdidx == CMD_ll
4451 	    || eap->cmdidx == CMD_lrewind
4452 	    || eap->cmdidx == CMD_lfirst
4453 	    || eap->cmdidx == CMD_llast
4454 	    || eap->cmdidx == CMD_ldo
4455 	    || eap->cmdidx == CMD_lfdo)
4456     {
4457 	qi = GET_LOC_LIST(curwin);
4458 	if (qi == NULL)
4459 	{
4460 	    EMSG(_(e_loclist));
4461 	    return;
4462 	}
4463     }
4464 
4465     if (eap->addr_count > 0)
4466 	errornr = (int)eap->line2;
4467     else
4468     {
4469 	if (eap->cmdidx == CMD_cc || eap->cmdidx == CMD_ll)
4470 	    errornr = 0;
4471 	else if (eap->cmdidx == CMD_crewind || eap->cmdidx == CMD_lrewind
4472 		|| eap->cmdidx == CMD_cfirst || eap->cmdidx == CMD_lfirst)
4473 	    errornr = 1;
4474 	else
4475 	    errornr = 32767;
4476     }
4477 
4478     /* For cdo and ldo commands, jump to the nth valid error.
4479      * For cfdo and lfdo commands, jump to the nth valid file entry.
4480      */
4481     if (eap->cmdidx == CMD_cdo || eap->cmdidx == CMD_ldo
4482 	    || eap->cmdidx == CMD_cfdo || eap->cmdidx == CMD_lfdo)
4483 	errornr = qf_get_nth_valid_entry(qi,
4484 		eap->addr_count > 0 ? (int)eap->line1 : 1,
4485 		eap->cmdidx == CMD_cfdo || eap->cmdidx == CMD_lfdo);
4486 
4487     qf_jump(qi, 0, errornr, eap->forceit);
4488 }
4489 
4490 /*
4491  * ":cnext", ":cnfile", ":cNext" and ":cprevious".
4492  * ":lnext", ":lNext", ":lprevious", ":lnfile", ":lNfile" and ":lpfile".
4493  * Also, used by ":cdo", ":ldo", ":cfdo" and ":lfdo" commands.
4494  */
4495     void
4496 ex_cnext(exarg_T *eap)
4497 {
4498     qf_info_T	*qi = &ql_info;
4499     int		errornr;
4500 
4501     if (eap->cmdidx == CMD_lnext
4502 	    || eap->cmdidx == CMD_lNext
4503 	    || eap->cmdidx == CMD_lprevious
4504 	    || eap->cmdidx == CMD_lnfile
4505 	    || eap->cmdidx == CMD_lNfile
4506 	    || eap->cmdidx == CMD_lpfile
4507 	    || eap->cmdidx == CMD_ldo
4508 	    || eap->cmdidx == CMD_lfdo)
4509     {
4510 	qi = GET_LOC_LIST(curwin);
4511 	if (qi == NULL)
4512 	{
4513 	    EMSG(_(e_loclist));
4514 	    return;
4515 	}
4516     }
4517 
4518     if (eap->addr_count > 0
4519 	    && (eap->cmdidx != CMD_cdo && eap->cmdidx != CMD_ldo
4520 		&& eap->cmdidx != CMD_cfdo && eap->cmdidx != CMD_lfdo))
4521 	errornr = (int)eap->line2;
4522     else
4523 	errornr = 1;
4524 
4525     qf_jump(qi, (eap->cmdidx == CMD_cnext || eap->cmdidx == CMD_lnext
4526 		|| eap->cmdidx == CMD_cdo || eap->cmdidx == CMD_ldo)
4527 	    ? FORWARD
4528 	    : (eap->cmdidx == CMD_cnfile || eap->cmdidx == CMD_lnfile
4529 		|| eap->cmdidx == CMD_cfdo || eap->cmdidx == CMD_lfdo)
4530 		? FORWARD_FILE
4531 		: (eap->cmdidx == CMD_cpfile || eap->cmdidx == CMD_lpfile
4532 		   || eap->cmdidx == CMD_cNfile || eap->cmdidx == CMD_lNfile)
4533 		    ? BACKWARD_FILE
4534 		    : BACKWARD,
4535 	    errornr, eap->forceit);
4536 }
4537 
4538 /*
4539  * ":cfile"/":cgetfile"/":caddfile" commands.
4540  * ":lfile"/":lgetfile"/":laddfile" commands.
4541  */
4542     void
4543 ex_cfile(exarg_T *eap)
4544 {
4545     char_u	*enc = NULL;
4546     win_T	*wp = NULL;
4547     qf_info_T	*qi = &ql_info;
4548     char_u	*au_name = NULL;
4549     int_u	save_qfid = 0;		/* init for gcc */
4550     int		res;
4551 
4552     switch (eap->cmdidx)
4553     {
4554 	case CMD_cfile:	    au_name = (char_u *)"cfile"; break;
4555 	case CMD_cgetfile:  au_name = (char_u *)"cgetfile"; break;
4556 	case CMD_caddfile:  au_name = (char_u *)"caddfile"; break;
4557 	case CMD_lfile:	    au_name = (char_u *)"lfile"; break;
4558 	case CMD_lgetfile:  au_name = (char_u *)"lgetfile"; break;
4559 	case CMD_laddfile:  au_name = (char_u *)"laddfile"; break;
4560 	default: break;
4561     }
4562     if (au_name != NULL)
4563 	apply_autocmds(EVENT_QUICKFIXCMDPRE, au_name, NULL, FALSE, curbuf);
4564 #ifdef FEAT_MBYTE
4565     enc = (*curbuf->b_p_menc != NUL) ? curbuf->b_p_menc : p_menc;
4566 #endif
4567 #ifdef FEAT_BROWSE
4568     if (cmdmod.browse)
4569     {
4570 	char_u *browse_file = do_browse(0, (char_u *)_("Error file"), eap->arg,
4571 				   NULL, NULL,
4572 				   (char_u *)_(BROWSE_FILTER_ALL_FILES), NULL);
4573 	if (browse_file == NULL)
4574 	    return;
4575 	set_string_option_direct((char_u *)"ef", -1, browse_file, OPT_FREE, 0);
4576 	vim_free(browse_file);
4577     }
4578     else
4579 #endif
4580     if (*eap->arg != NUL)
4581 	set_string_option_direct((char_u *)"ef", -1, eap->arg, OPT_FREE, 0);
4582 
4583     if (eap->cmdidx == CMD_lfile
4584 	    || eap->cmdidx == CMD_lgetfile
4585 	    || eap->cmdidx == CMD_laddfile)
4586 	wp = curwin;
4587 
4588     /*
4589      * This function is used by the :cfile, :cgetfile and :caddfile
4590      * commands.
4591      * :cfile always creates a new quickfix list and jumps to the
4592      * first error.
4593      * :cgetfile creates a new quickfix list but doesn't jump to the
4594      * first error.
4595      * :caddfile adds to an existing quickfix list. If there is no
4596      * quickfix list then a new list is created.
4597      */
4598     res = qf_init(wp, p_ef, p_efm, (eap->cmdidx != CMD_caddfile
4599 			&& eap->cmdidx != CMD_laddfile),
4600 			qf_cmdtitle(*eap->cmdlinep), enc);
4601     if (wp != NULL)
4602     {
4603 	qi = GET_LOC_LIST(wp);
4604 	if (qi == NULL)
4605 	    return;
4606     }
4607     if (res >= 0)
4608 	qf_list_changed(qi, qi->qf_curlist);
4609     save_qfid = qi->qf_lists[qi->qf_curlist].qf_id;
4610     if (au_name != NULL)
4611 	apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name, NULL, FALSE, curbuf);
4612 
4613     // Jump to the first error for a new list and if autocmds didn't
4614     // free the list.
4615     if (res > 0 && (eap->cmdidx == CMD_cfile || eap->cmdidx == CMD_lfile)
4616 	    && qflist_valid(wp, save_qfid))
4617     {
4618 	// If autocommands changed the current list, then restore it
4619 	if (qi->qf_lists[qi->qf_curlist].qf_id != save_qfid)
4620 	    qi->qf_curlist = qf_id2nr(qi, save_qfid);
4621 	qf_jump(qi, 0, 0, eap->forceit);	/* display first error */
4622     }
4623 }
4624 
4625 /*
4626  * Return the vimgrep autocmd name.
4627  */
4628     static char_u *
4629 vgr_get_auname(cmdidx_T cmdidx)
4630 {
4631     switch (cmdidx)
4632     {
4633 	case CMD_vimgrep:     return (char_u *)"vimgrep";
4634 	case CMD_lvimgrep:    return (char_u *)"lvimgrep";
4635 	case CMD_vimgrepadd:  return (char_u *)"vimgrepadd";
4636 	case CMD_lvimgrepadd: return (char_u *)"lvimgrepadd";
4637 	case CMD_grep:	      return (char_u *)"grep";
4638 	case CMD_lgrep:	      return (char_u *)"lgrep";
4639 	case CMD_grepadd:     return (char_u *)"grepadd";
4640 	case CMD_lgrepadd:    return (char_u *)"lgrepadd";
4641 	default: return NULL;
4642     }
4643 }
4644 
4645 /*
4646  * Initialize the regmatch used by vimgrep for pattern "s".
4647  */
4648     static void
4649 vgr_init_regmatch(regmmatch_T *regmatch, char_u *s)
4650 {
4651     /* Get the search pattern: either white-separated or enclosed in // */
4652     regmatch->regprog = NULL;
4653 
4654     if (s == NULL || *s == NUL)
4655     {
4656 	/* Pattern is empty, use last search pattern. */
4657 	if (last_search_pat() == NULL)
4658 	{
4659 	    EMSG(_(e_noprevre));
4660 	    return;
4661 	}
4662 	regmatch->regprog = vim_regcomp(last_search_pat(), RE_MAGIC);
4663     }
4664     else
4665 	regmatch->regprog = vim_regcomp(s, RE_MAGIC);
4666 
4667     regmatch->rmm_ic = p_ic;
4668     regmatch->rmm_maxcol = 0;
4669 }
4670 
4671 /*
4672  * Display a file name when vimgrep is running.
4673  */
4674     static void
4675 vgr_display_fname(char_u *fname)
4676 {
4677     char_u	*p;
4678 
4679     msg_start();
4680     p = msg_strtrunc(fname, TRUE);
4681     if (p == NULL)
4682 	msg_outtrans(fname);
4683     else
4684     {
4685 	msg_outtrans(p);
4686 	vim_free(p);
4687     }
4688     msg_clr_eos();
4689     msg_didout = FALSE;	    /* overwrite this message */
4690     msg_nowait = TRUE;	    /* don't wait for this message */
4691     msg_col = 0;
4692     out_flush();
4693 }
4694 
4695 /*
4696  * Load a dummy buffer to search for a pattern using vimgrep.
4697  */
4698     static buf_T *
4699 vgr_load_dummy_buf(
4700 	char_u *fname,
4701 	char_u *dirname_start,
4702 	char_u *dirname_now)
4703 {
4704     int		save_mls;
4705 #if defined(FEAT_SYN_HL)
4706     char_u	*save_ei = NULL;
4707 #endif
4708     buf_T	*buf;
4709 
4710 #if defined(FEAT_SYN_HL)
4711     /* Don't do Filetype autocommands to avoid loading syntax and
4712      * indent scripts, a great speed improvement. */
4713     save_ei = au_event_disable(",Filetype");
4714 #endif
4715     /* Don't use modelines here, it's useless. */
4716     save_mls = p_mls;
4717     p_mls = 0;
4718 
4719     /* Load file into a buffer, so that 'fileencoding' is detected,
4720      * autocommands applied, etc. */
4721     buf = load_dummy_buffer(fname, dirname_start, dirname_now);
4722 
4723     p_mls = save_mls;
4724 #if defined(FEAT_SYN_HL)
4725     au_event_restore(save_ei);
4726 #endif
4727 
4728     return buf;
4729 }
4730 
4731 /*
4732  * Check whether a quickfix/location list valid. Autocmds may remove or change
4733  * a quickfix list when vimgrep is running. If the list is not found, create a
4734  * new list.
4735  */
4736     static int
4737 vgr_qflist_valid(
4738 	win_T	    *wp,
4739 	qf_info_T   *qi,
4740 	int_u	    qfid,
4741 	char_u	    *title)
4742 {
4743     /* Verify that the quickfix/location list was not freed by an autocmd */
4744     if (!qflist_valid(wp, qfid))
4745     {
4746 	if (wp != NULL)
4747 	{
4748 	    /* An autocmd has freed the location list. */
4749 	    EMSG(_(e_loc_list_changed));
4750 	    return FALSE;
4751 	}
4752 	else
4753 	{
4754 	    /* Quickfix list is not found, create a new one. */
4755 	    qf_new_list(qi, title);
4756 	    return TRUE;
4757 	}
4758     }
4759 
4760     if (qi->qf_lists[qi->qf_curlist].qf_id != qfid)
4761 	/* Autocommands changed the quickfix list.  Find the one we were
4762 	 * using and restore it. */
4763 	qi->qf_curlist = qf_id2nr(qi, qfid);
4764 
4765     return TRUE;
4766 }
4767 
4768 /*
4769  * Search for a pattern in all the lines in a buffer and add the matching lines
4770  * to a quickfix list.
4771  */
4772     static int
4773 vgr_match_buflines(
4774 	qf_info_T   *qi,
4775 	char_u	    *fname,
4776 	buf_T	    *buf,
4777 	regmmatch_T *regmatch,
4778 	long	    tomatch,
4779 	int	    duplicate_name,
4780 	int	    flags)
4781 {
4782     int		found_match = FALSE;
4783     long	lnum;
4784     colnr_T	col;
4785 
4786     for (lnum = 1; lnum <= buf->b_ml.ml_line_count && tomatch > 0; ++lnum)
4787     {
4788 	col = 0;
4789 	while (vim_regexec_multi(regmatch, curwin, buf, lnum,
4790 		    col, NULL, NULL) > 0)
4791 	{
4792 	    /* Pass the buffer number so that it gets used even for a
4793 	     * dummy buffer, unless duplicate_name is set, then the
4794 	     * buffer will be wiped out below. */
4795 	    if (qf_add_entry(qi,
4796 			qi->qf_curlist,
4797 			NULL,       /* dir */
4798 			fname,
4799 			NULL,
4800 			duplicate_name ? 0 : buf->b_fnum,
4801 			ml_get_buf(buf,
4802 			    regmatch->startpos[0].lnum + lnum, FALSE),
4803 			regmatch->startpos[0].lnum + lnum,
4804 			regmatch->startpos[0].col + 1,
4805 			FALSE,      /* vis_col */
4806 			NULL,	    /* search pattern */
4807 			0,	    /* nr */
4808 			0,	    /* type */
4809 			TRUE	    /* valid */
4810 			) == FAIL)
4811 	    {
4812 		got_int = TRUE;
4813 		break;
4814 	    }
4815 	    found_match = TRUE;
4816 	    if (--tomatch == 0)
4817 		break;
4818 	    if ((flags & VGR_GLOBAL) == 0
4819 		    || regmatch->endpos[0].lnum > 0)
4820 		break;
4821 	    col = regmatch->endpos[0].col
4822 		+ (col == regmatch->endpos[0].col);
4823 	    if (col > (colnr_T)STRLEN(ml_get_buf(buf, lnum, FALSE)))
4824 		break;
4825 	}
4826 	line_breakcheck();
4827 	if (got_int)
4828 	    break;
4829     }
4830 
4831     return found_match;
4832 }
4833 
4834 /*
4835  * Jump to the first match and update the directory.
4836  */
4837     static void
4838 vgr_jump_to_match(
4839 	qf_info_T   *qi,
4840 	int	    forceit,
4841 	int	    *redraw_for_dummy,
4842 	buf_T	    *first_match_buf,
4843 	char_u	    *target_dir)
4844 {
4845     buf_T	*buf;
4846 
4847     buf = curbuf;
4848     qf_jump(qi, 0, 0, forceit);
4849     if (buf != curbuf)
4850 	/* If we jumped to another buffer redrawing will already be
4851 	 * taken care of. */
4852 	*redraw_for_dummy = FALSE;
4853 
4854     /* Jump to the directory used after loading the buffer. */
4855     if (curbuf == first_match_buf && target_dir != NULL)
4856     {
4857 	exarg_T ea;
4858 
4859 	ea.arg = target_dir;
4860 	ea.cmdidx = CMD_lcd;
4861 	ex_cd(&ea);
4862     }
4863 }
4864 
4865 /*
4866  * ":vimgrep {pattern} file(s)"
4867  * ":vimgrepadd {pattern} file(s)"
4868  * ":lvimgrep {pattern} file(s)"
4869  * ":lvimgrepadd {pattern} file(s)"
4870  */
4871     void
4872 ex_vimgrep(exarg_T *eap)
4873 {
4874     regmmatch_T	regmatch;
4875     int		fcount;
4876     char_u	**fnames;
4877     char_u	*fname;
4878     char_u	*title;
4879     char_u	*s;
4880     char_u	*p;
4881     int		fi;
4882     qf_info_T	*qi = &ql_info;
4883     int_u	save_qfid;
4884     win_T	*wp = NULL;
4885     buf_T	*buf;
4886     int		duplicate_name = FALSE;
4887     int		using_dummy;
4888     int		redraw_for_dummy = FALSE;
4889     int		found_match;
4890     buf_T	*first_match_buf = NULL;
4891     time_t	seconds = 0;
4892     aco_save_T	aco;
4893     int		flags = 0;
4894     long	tomatch;
4895     char_u	*dirname_start = NULL;
4896     char_u	*dirname_now = NULL;
4897     char_u	*target_dir = NULL;
4898     char_u	*au_name =  NULL;
4899 
4900     au_name = vgr_get_auname(eap->cmdidx);
4901     if (au_name != NULL && apply_autocmds(EVENT_QUICKFIXCMDPRE, au_name,
4902 					       curbuf->b_fname, TRUE, curbuf))
4903     {
4904 #ifdef FEAT_EVAL
4905 	if (aborting())
4906 	    return;
4907 #endif
4908     }
4909 
4910     if (eap->cmdidx == CMD_lgrep
4911 	    || eap->cmdidx == CMD_lvimgrep
4912 	    || eap->cmdidx == CMD_lgrepadd
4913 	    || eap->cmdidx == CMD_lvimgrepadd)
4914     {
4915 	qi = ll_get_or_alloc_list(curwin);
4916 	if (qi == NULL)
4917 	    return;
4918 	wp = curwin;
4919     }
4920 
4921     if (eap->addr_count > 0)
4922 	tomatch = eap->line2;
4923     else
4924 	tomatch = MAXLNUM;
4925 
4926     /* Get the search pattern: either white-separated or enclosed in // */
4927     regmatch.regprog = NULL;
4928     title = vim_strsave(qf_cmdtitle(*eap->cmdlinep));
4929     p = skip_vimgrep_pat(eap->arg, &s, &flags);
4930     if (p == NULL)
4931     {
4932 	EMSG(_(e_invalpat));
4933 	goto theend;
4934     }
4935 
4936     vgr_init_regmatch(&regmatch, s);
4937     if (regmatch.regprog == NULL)
4938 	goto theend;
4939 
4940     p = skipwhite(p);
4941     if (*p == NUL)
4942     {
4943 	EMSG(_("E683: File name missing or invalid pattern"));
4944 	goto theend;
4945     }
4946 
4947     if ((eap->cmdidx != CMD_grepadd && eap->cmdidx != CMD_lgrepadd
4948 		&& eap->cmdidx != CMD_vimgrepadd
4949 		&& eap->cmdidx != CMD_lvimgrepadd)
4950 					|| qi->qf_curlist == qi->qf_listcount)
4951 	/* make place for a new list */
4952 	qf_new_list(qi, title != NULL ? title : qf_cmdtitle(*eap->cmdlinep));
4953 
4954     /* parse the list of arguments */
4955     if (get_arglist_exp(p, &fcount, &fnames, TRUE) == FAIL)
4956 	goto theend;
4957     if (fcount == 0)
4958     {
4959 	EMSG(_(e_nomatch));
4960 	goto theend;
4961     }
4962 
4963     dirname_start = alloc_id(MAXPATHL, aid_qf_dirname_start);
4964     dirname_now = alloc_id(MAXPATHL, aid_qf_dirname_now);
4965     if (dirname_start == NULL || dirname_now == NULL)
4966     {
4967 	FreeWild(fcount, fnames);
4968 	goto theend;
4969     }
4970 
4971     /* Remember the current directory, because a BufRead autocommand that does
4972      * ":lcd %:p:h" changes the meaning of short path names. */
4973     mch_dirname(dirname_start, MAXPATHL);
4974 
4975      /* Remember the current quickfix list identifier, so that we can check for
4976       * autocommands changing the current quickfix list. */
4977     save_qfid = qi->qf_lists[qi->qf_curlist].qf_id;
4978 
4979     seconds = (time_t)0;
4980     for (fi = 0; fi < fcount && !got_int && tomatch > 0; ++fi)
4981     {
4982 	fname = shorten_fname1(fnames[fi]);
4983 	if (time(NULL) > seconds)
4984 	{
4985 	    /* Display the file name every second or so, show the user we are
4986 	     * working on it. */
4987 	    seconds = time(NULL);
4988 	    vgr_display_fname(fname);
4989 	}
4990 
4991 	buf = buflist_findname_exp(fnames[fi]);
4992 	if (buf == NULL || buf->b_ml.ml_mfp == NULL)
4993 	{
4994 	    /* Remember that a buffer with this name already exists. */
4995 	    duplicate_name = (buf != NULL);
4996 	    using_dummy = TRUE;
4997 	    redraw_for_dummy = TRUE;
4998 
4999 	    buf = vgr_load_dummy_buf(fname, dirname_start, dirname_now);
5000 	}
5001 	else
5002 	    /* Use existing, loaded buffer. */
5003 	    using_dummy = FALSE;
5004 
5005 	/* Check whether the quickfix list is still valid. When loading a
5006 	 * buffer above, autocommands might have changed the quickfix list. */
5007 	if (!vgr_qflist_valid(wp, qi, save_qfid, qf_cmdtitle(*eap->cmdlinep)))
5008 	{
5009 	    FreeWild(fcount, fnames);
5010 	    goto theend;
5011 	}
5012 	save_qfid = qi->qf_lists[qi->qf_curlist].qf_id;
5013 
5014 	if (buf == NULL)
5015 	{
5016 	    if (!got_int)
5017 		smsg((char_u *)_("Cannot open file \"%s\""), fname);
5018 	}
5019 	else
5020 	{
5021 	    /* Try for a match in all lines of the buffer.
5022 	     * For ":1vimgrep" look for first match only. */
5023 	    found_match = vgr_match_buflines(qi, fname, buf, &regmatch,
5024 		    tomatch, duplicate_name, flags);
5025 
5026 	    if (using_dummy)
5027 	    {
5028 		if (found_match && first_match_buf == NULL)
5029 		    first_match_buf = buf;
5030 		if (duplicate_name)
5031 		{
5032 		    /* Never keep a dummy buffer if there is another buffer
5033 		     * with the same name. */
5034 		    wipe_dummy_buffer(buf, dirname_start);
5035 		    buf = NULL;
5036 		}
5037 		else if (!cmdmod.hide
5038 			    || buf->b_p_bh[0] == 'u'	/* "unload" */
5039 			    || buf->b_p_bh[0] == 'w'	/* "wipe" */
5040 			    || buf->b_p_bh[0] == 'd')	/* "delete" */
5041 		{
5042 		    /* When no match was found we don't need to remember the
5043 		     * buffer, wipe it out.  If there was a match and it
5044 		     * wasn't the first one or we won't jump there: only
5045 		     * unload the buffer.
5046 		     * Ignore 'hidden' here, because it may lead to having too
5047 		     * many swap files. */
5048 		    if (!found_match)
5049 		    {
5050 			wipe_dummy_buffer(buf, dirname_start);
5051 			buf = NULL;
5052 		    }
5053 		    else if (buf != first_match_buf || (flags & VGR_NOJUMP))
5054 		    {
5055 			unload_dummy_buffer(buf, dirname_start);
5056 			/* Keeping the buffer, remove the dummy flag. */
5057 			buf->b_flags &= ~BF_DUMMY;
5058 			buf = NULL;
5059 		    }
5060 		}
5061 
5062 		if (buf != NULL)
5063 		{
5064 		    /* Keeping the buffer, remove the dummy flag. */
5065 		    buf->b_flags &= ~BF_DUMMY;
5066 
5067 		    /* If the buffer is still loaded we need to use the
5068 		     * directory we jumped to below. */
5069 		    if (buf == first_match_buf
5070 			    && target_dir == NULL
5071 			    && STRCMP(dirname_start, dirname_now) != 0)
5072 			target_dir = vim_strsave(dirname_now);
5073 
5074 		    /* The buffer is still loaded, the Filetype autocommands
5075 		     * need to be done now, in that buffer.  And the modelines
5076 		     * need to be done (again).  But not the window-local
5077 		     * options! */
5078 		    aucmd_prepbuf(&aco, buf);
5079 #if defined(FEAT_SYN_HL)
5080 		    apply_autocmds(EVENT_FILETYPE, buf->b_p_ft,
5081 						     buf->b_fname, TRUE, buf);
5082 #endif
5083 		    do_modelines(OPT_NOWIN);
5084 		    aucmd_restbuf(&aco);
5085 		}
5086 	    }
5087 	}
5088     }
5089 
5090     FreeWild(fcount, fnames);
5091 
5092     qi->qf_lists[qi->qf_curlist].qf_nonevalid = FALSE;
5093     qi->qf_lists[qi->qf_curlist].qf_ptr = qi->qf_lists[qi->qf_curlist].qf_start;
5094     qi->qf_lists[qi->qf_curlist].qf_index = 1;
5095     qf_list_changed(qi, qi->qf_curlist);
5096 
5097     qf_update_buffer(qi, NULL);
5098 
5099     if (au_name != NULL)
5100 	apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
5101 					       curbuf->b_fname, TRUE, curbuf);
5102     /*
5103      * The QuickFixCmdPost autocmd may free the quickfix list. Check the list
5104      * is still valid.
5105      */
5106     if (!qflist_valid(wp, save_qfid))
5107 	goto theend;
5108 
5109     // If autocommands changed the current list, then restore it
5110     if (qi->qf_lists[qi->qf_curlist].qf_id != save_qfid)
5111 	qi->qf_curlist = qf_id2nr(qi, save_qfid);
5112 
5113     /* Jump to first match. */
5114     if (qi->qf_lists[qi->qf_curlist].qf_count > 0)
5115     {
5116 	if ((flags & VGR_NOJUMP) == 0)
5117 	    vgr_jump_to_match(qi, eap->forceit, &redraw_for_dummy,
5118 		    first_match_buf, target_dir);
5119     }
5120     else
5121 	EMSG2(_(e_nomatch2), s);
5122 
5123     /* If we loaded a dummy buffer into the current window, the autocommands
5124      * may have messed up things, need to redraw and recompute folds. */
5125     if (redraw_for_dummy)
5126     {
5127 #ifdef FEAT_FOLDING
5128 	foldUpdateAll(curwin);
5129 #else
5130 	redraw_later(NOT_VALID);
5131 #endif
5132     }
5133 
5134 theend:
5135     vim_free(title);
5136     vim_free(dirname_now);
5137     vim_free(dirname_start);
5138     vim_free(target_dir);
5139     vim_regfree(regmatch.regprog);
5140 }
5141 
5142 /*
5143  * Restore current working directory to "dirname_start" if they differ, taking
5144  * into account whether it is set locally or globally.
5145  */
5146     static void
5147 restore_start_dir(char_u *dirname_start)
5148 {
5149     char_u *dirname_now = alloc(MAXPATHL);
5150 
5151     if (NULL != dirname_now)
5152     {
5153 	mch_dirname(dirname_now, MAXPATHL);
5154 	if (STRCMP(dirname_start, dirname_now) != 0)
5155 	{
5156 	    /* If the directory has changed, change it back by building up an
5157 	     * appropriate ex command and executing it. */
5158 	    exarg_T ea;
5159 
5160 	    ea.arg = dirname_start;
5161 	    ea.cmdidx = (curwin->w_localdir == NULL) ? CMD_cd : CMD_lcd;
5162 	    ex_cd(&ea);
5163 	}
5164 	vim_free(dirname_now);
5165     }
5166 }
5167 
5168 /*
5169  * Load file "fname" into a dummy buffer and return the buffer pointer,
5170  * placing the directory resulting from the buffer load into the
5171  * "resulting_dir" pointer. "resulting_dir" must be allocated by the caller
5172  * prior to calling this function. Restores directory to "dirname_start" prior
5173  * to returning, if autocmds or the 'autochdir' option have changed it.
5174  *
5175  * If creating the dummy buffer does not fail, must call unload_dummy_buffer()
5176  * or wipe_dummy_buffer() later!
5177  *
5178  * Returns NULL if it fails.
5179  */
5180     static buf_T *
5181 load_dummy_buffer(
5182     char_u	*fname,
5183     char_u	*dirname_start,  /* in: old directory */
5184     char_u	*resulting_dir)  /* out: new directory */
5185 {
5186     buf_T	*newbuf;
5187     bufref_T	newbufref;
5188     bufref_T	newbuf_to_wipe;
5189     int		failed = TRUE;
5190     aco_save_T	aco;
5191     int		readfile_result;
5192 
5193     /* Allocate a buffer without putting it in the buffer list. */
5194     newbuf = buflist_new(NULL, NULL, (linenr_T)1, BLN_DUMMY);
5195     if (newbuf == NULL)
5196 	return NULL;
5197     set_bufref(&newbufref, newbuf);
5198 
5199     /* Init the options. */
5200     buf_copy_options(newbuf, BCO_ENTER | BCO_NOHELP);
5201 
5202     /* need to open the memfile before putting the buffer in a window */
5203     if (ml_open(newbuf) == OK)
5204     {
5205 	/* Make sure this buffer isn't wiped out by autocommands. */
5206 	++newbuf->b_locked;
5207 
5208 	/* set curwin/curbuf to buf and save a few things */
5209 	aucmd_prepbuf(&aco, newbuf);
5210 
5211 	/* Need to set the filename for autocommands. */
5212 	(void)setfname(curbuf, fname, NULL, FALSE);
5213 
5214 	/* Create swap file now to avoid the ATTENTION message. */
5215 	check_need_swap(TRUE);
5216 
5217 	/* Remove the "dummy" flag, otherwise autocommands may not
5218 	 * work. */
5219 	curbuf->b_flags &= ~BF_DUMMY;
5220 
5221 	newbuf_to_wipe.br_buf = NULL;
5222 	readfile_result = readfile(fname, NULL,
5223 		    (linenr_T)0, (linenr_T)0, (linenr_T)MAXLNUM,
5224 		    NULL, READ_NEW | READ_DUMMY);
5225 	--newbuf->b_locked;
5226 	if (readfile_result == OK
5227 		&& !got_int
5228 		&& !(curbuf->b_flags & BF_NEW))
5229 	{
5230 	    failed = FALSE;
5231 	    if (curbuf != newbuf)
5232 	    {
5233 		/* Bloody autocommands changed the buffer!  Can happen when
5234 		 * using netrw and editing a remote file.  Use the current
5235 		 * buffer instead, delete the dummy one after restoring the
5236 		 * window stuff. */
5237 		set_bufref(&newbuf_to_wipe, newbuf);
5238 		newbuf = curbuf;
5239 	    }
5240 	}
5241 
5242 	/* restore curwin/curbuf and a few other things */
5243 	aucmd_restbuf(&aco);
5244 	if (newbuf_to_wipe.br_buf != NULL && bufref_valid(&newbuf_to_wipe))
5245 	    wipe_buffer(newbuf_to_wipe.br_buf, FALSE);
5246 
5247 	/* Add back the "dummy" flag, otherwise buflist_findname_stat() won't
5248 	 * skip it. */
5249 	newbuf->b_flags |= BF_DUMMY;
5250     }
5251 
5252     /*
5253      * When autocommands/'autochdir' option changed directory: go back.
5254      * Let the caller know what the resulting dir was first, in case it is
5255      * important.
5256      */
5257     mch_dirname(resulting_dir, MAXPATHL);
5258     restore_start_dir(dirname_start);
5259 
5260     if (!bufref_valid(&newbufref))
5261 	return NULL;
5262     if (failed)
5263     {
5264 	wipe_dummy_buffer(newbuf, dirname_start);
5265 	return NULL;
5266     }
5267     return newbuf;
5268 }
5269 
5270 /*
5271  * Wipe out the dummy buffer that load_dummy_buffer() created. Restores
5272  * directory to "dirname_start" prior to returning, if autocmds or the
5273  * 'autochdir' option have changed it.
5274  */
5275     static void
5276 wipe_dummy_buffer(buf_T *buf, char_u *dirname_start)
5277 {
5278     if (curbuf != buf)		/* safety check */
5279     {
5280 #if defined(FEAT_EVAL)
5281 	cleanup_T   cs;
5282 
5283 	/* Reset the error/interrupt/exception state here so that aborting()
5284 	 * returns FALSE when wiping out the buffer.  Otherwise it doesn't
5285 	 * work when got_int is set. */
5286 	enter_cleanup(&cs);
5287 #endif
5288 
5289 	wipe_buffer(buf, FALSE);
5290 
5291 #if defined(FEAT_EVAL)
5292 	/* Restore the error/interrupt/exception state if not discarded by a
5293 	 * new aborting error, interrupt, or uncaught exception. */
5294 	leave_cleanup(&cs);
5295 #endif
5296 	/* When autocommands/'autochdir' option changed directory: go back. */
5297 	restore_start_dir(dirname_start);
5298     }
5299 }
5300 
5301 /*
5302  * Unload the dummy buffer that load_dummy_buffer() created. Restores
5303  * directory to "dirname_start" prior to returning, if autocmds or the
5304  * 'autochdir' option have changed it.
5305  */
5306     static void
5307 unload_dummy_buffer(buf_T *buf, char_u *dirname_start)
5308 {
5309     if (curbuf != buf)		/* safety check */
5310     {
5311 	close_buffer(NULL, buf, DOBUF_UNLOAD, FALSE);
5312 
5313 	/* When autocommands/'autochdir' option changed directory: go back. */
5314 	restore_start_dir(dirname_start);
5315     }
5316 }
5317 
5318 #if defined(FEAT_EVAL) || defined(PROTO)
5319 /*
5320  * Add each quickfix error to list "list" as a dictionary.
5321  * If qf_idx is -1, use the current list. Otherwise, use the specified list.
5322  */
5323     int
5324 get_errorlist(qf_info_T *qi_arg, win_T *wp, int qf_idx, list_T *list)
5325 {
5326     qf_info_T	*qi = qi_arg;
5327     dict_T	*dict;
5328     char_u	buf[2];
5329     qfline_T	*qfp;
5330     int		i;
5331     int		bufnum;
5332 
5333     if (qi == NULL)
5334     {
5335 	qi = &ql_info;
5336 	if (wp != NULL)
5337 	{
5338 	    qi = GET_LOC_LIST(wp);
5339 	    if (qi == NULL)
5340 		return FAIL;
5341 	}
5342     }
5343 
5344     if (qf_idx == INVALID_QFIDX)
5345 	qf_idx = qi->qf_curlist;
5346 
5347     if (qf_idx >= qi->qf_listcount
5348 	    || qi->qf_lists[qf_idx].qf_count == 0)
5349 	return FAIL;
5350 
5351     qfp = qi->qf_lists[qf_idx].qf_start;
5352     for (i = 1; !got_int && i <= qi->qf_lists[qf_idx].qf_count; ++i)
5353     {
5354 	/* Handle entries with a non-existing buffer number. */
5355 	bufnum = qfp->qf_fnum;
5356 	if (bufnum != 0 && (buflist_findnr(bufnum) == NULL))
5357 	    bufnum = 0;
5358 
5359 	if ((dict = dict_alloc()) == NULL)
5360 	    return FAIL;
5361 	if (list_append_dict(list, dict) == FAIL)
5362 	    return FAIL;
5363 
5364 	buf[0] = qfp->qf_type;
5365 	buf[1] = NUL;
5366 	if ( dict_add_number(dict, "bufnr", (long)bufnum) == FAIL
5367 	  || dict_add_number(dict, "lnum",  (long)qfp->qf_lnum) == FAIL
5368 	  || dict_add_number(dict, "col",   (long)qfp->qf_col) == FAIL
5369 	  || dict_add_number(dict, "vcol",  (long)qfp->qf_viscol) == FAIL
5370 	  || dict_add_number(dict, "nr",    (long)qfp->qf_nr) == FAIL
5371 	  || dict_add_string(dict, "module", qfp->qf_module) == FAIL
5372 	  || dict_add_string(dict, "pattern", qfp->qf_pattern) == FAIL
5373 	  || dict_add_string(dict, "text", qfp->qf_text) == FAIL
5374 	  || dict_add_string(dict, "type", buf) == FAIL
5375 	  || dict_add_number(dict, "valid", (long)qfp->qf_valid) == FAIL)
5376 	    return FAIL;
5377 
5378 	qfp = qfp->qf_next;
5379 	if (qfp == NULL)
5380 	    break;
5381     }
5382     return OK;
5383 }
5384 
5385 /*
5386  * Flags used by getqflist()/getloclist() to determine which fields to return.
5387  */
5388 enum {
5389     QF_GETLIST_NONE	= 0x0,
5390     QF_GETLIST_TITLE	= 0x1,
5391     QF_GETLIST_ITEMS	= 0x2,
5392     QF_GETLIST_NR	= 0x4,
5393     QF_GETLIST_WINID	= 0x8,
5394     QF_GETLIST_CONTEXT	= 0x10,
5395     QF_GETLIST_ID	= 0x20,
5396     QF_GETLIST_IDX	= 0x40,
5397     QF_GETLIST_SIZE	= 0x80,
5398     QF_GETLIST_TICK	= 0x100,
5399     QF_GETLIST_ALL	= 0x1FF,
5400 };
5401 
5402 /*
5403  * Parse text from 'di' and return the quickfix list items.
5404  * Existing quickfix lists are not modified.
5405  */
5406     static int
5407 qf_get_list_from_lines(dict_T *what, dictitem_T *di, dict_T *retdict)
5408 {
5409     int		status = FAIL;
5410     qf_info_T	*qi;
5411     char_u	*errorformat = p_efm;
5412     dictitem_T	*efm_di;
5413     list_T	*l;
5414 
5415     /* Only a List value is supported */
5416     if (di->di_tv.v_type == VAR_LIST && di->di_tv.vval.v_list != NULL)
5417     {
5418 	/* If errorformat is supplied then use it, otherwise use the 'efm'
5419 	 * option setting
5420 	 */
5421 	if ((efm_di = dict_find(what, (char_u *)"efm", -1)) != NULL)
5422 	{
5423 	    if (efm_di->di_tv.v_type != VAR_STRING ||
5424 		    efm_di->di_tv.vval.v_string == NULL)
5425 		return FAIL;
5426 	    errorformat = efm_di->di_tv.vval.v_string;
5427 	}
5428 
5429 	l = list_alloc();
5430 	if (l == NULL)
5431 	    return FAIL;
5432 
5433 	qi = (qf_info_T *)alloc((unsigned)sizeof(qf_info_T));
5434 	if (qi != NULL)
5435 	{
5436 	    vim_memset(qi, 0, (size_t)(sizeof(qf_info_T)));
5437 	    qi->qf_refcount++;
5438 
5439 	    if (qf_init_ext(qi, 0, NULL, NULL, &di->di_tv, errorformat,
5440 			TRUE, (linenr_T)0, (linenr_T)0, NULL, NULL) > 0)
5441 	    {
5442 		(void)get_errorlist(qi, NULL, 0, l);
5443 		qf_free(qi, 0);
5444 	    }
5445 	    free(qi);
5446 	}
5447 	dict_add_list(retdict, "items", l);
5448 	status = OK;
5449     }
5450 
5451     return status;
5452 }
5453 
5454 /*
5455  * Return the quickfix/location list window identifier in the current tabpage.
5456  */
5457     static int
5458 qf_winid(qf_info_T *qi)
5459 {
5460     win_T	*win;
5461 
5462     /* The quickfix window can be opened even if the quickfix list is not set
5463      * using ":copen". This is not true for location lists.  */
5464     if (qi == NULL)
5465 	return 0;
5466     win = qf_find_win(qi);
5467     if (win != NULL)
5468 	return win->w_id;
5469     return 0;
5470 }
5471 
5472 /*
5473  * Convert the keys in 'what' to quickfix list property flags.
5474  */
5475     static int
5476 qf_getprop_keys2flags(dict_T *what)
5477 {
5478     int		flags = QF_GETLIST_NONE;
5479 
5480     if (dict_find(what, (char_u *)"all", -1) != NULL)
5481 	flags |= QF_GETLIST_ALL;
5482 
5483     if (dict_find(what, (char_u *)"title", -1) != NULL)
5484 	flags |= QF_GETLIST_TITLE;
5485 
5486     if (dict_find(what, (char_u *)"nr", -1) != NULL)
5487 	flags |= QF_GETLIST_NR;
5488 
5489     if (dict_find(what, (char_u *)"winid", -1) != NULL)
5490 	flags |= QF_GETLIST_WINID;
5491 
5492     if (dict_find(what, (char_u *)"context", -1) != NULL)
5493 	flags |= QF_GETLIST_CONTEXT;
5494 
5495     if (dict_find(what, (char_u *)"id", -1) != NULL)
5496 	flags |= QF_GETLIST_ID;
5497 
5498     if (dict_find(what, (char_u *)"items", -1) != NULL)
5499 	flags |= QF_GETLIST_ITEMS;
5500 
5501     if (dict_find(what, (char_u *)"idx", -1) != NULL)
5502 	flags |= QF_GETLIST_IDX;
5503 
5504     if (dict_find(what, (char_u *)"size", -1) != NULL)
5505 	flags |= QF_GETLIST_SIZE;
5506 
5507     if (dict_find(what, (char_u *)"changedtick", -1) != NULL)
5508 	flags |= QF_GETLIST_TICK;
5509 
5510     return flags;
5511 }
5512 
5513 /*
5514  * Return the quickfix list index based on 'nr' or 'id' in 'what'.
5515  * If 'nr' and 'id' are not present in 'what' then return the current
5516  * quickfix list index.
5517  * If 'nr' is zero then return the current quickfix list index.
5518  * If 'nr' is '$' then return the last quickfix list index.
5519  * If 'id' is present then return the index of the quickfix list with that id.
5520  * If 'id' is zero then return the quickfix list index specified by 'nr'.
5521  * Return -1, if quickfix list is not present or if the stack is empty.
5522  */
5523     static int
5524 qf_getprop_qfidx(qf_info_T *qi, dict_T *what)
5525 {
5526     int		qf_idx;
5527     dictitem_T	*di;
5528 
5529     qf_idx = qi->qf_curlist;	/* default is the current list */
5530     if ((di = dict_find(what, (char_u *)"nr", -1)) != NULL)
5531     {
5532 	/* Use the specified quickfix/location list */
5533 	if (di->di_tv.v_type == VAR_NUMBER)
5534 	{
5535 	    /* for zero use the current list */
5536 	    if (di->di_tv.vval.v_number != 0)
5537 	    {
5538 		qf_idx = di->di_tv.vval.v_number - 1;
5539 		if (qf_idx < 0 || qf_idx >= qi->qf_listcount)
5540 		    qf_idx = INVALID_QFIDX;
5541 	    }
5542 	}
5543 	else if (di->di_tv.v_type == VAR_STRING
5544 		&& di->di_tv.vval.v_string != NULL
5545 		&& STRCMP(di->di_tv.vval.v_string, "$") == 0)
5546 	    /* Get the last quickfix list number */
5547 	    qf_idx = qi->qf_listcount - 1;
5548 	else
5549 	    qf_idx = INVALID_QFIDX;
5550     }
5551 
5552     if ((di = dict_find(what, (char_u *)"id", -1)) != NULL)
5553     {
5554 	/* Look for a list with the specified id */
5555 	if (di->di_tv.v_type == VAR_NUMBER)
5556 	{
5557 	    /*
5558 	     * For zero, use the current list or the list specified by 'nr'
5559 	     */
5560 	    if (di->di_tv.vval.v_number != 0)
5561 		qf_idx = qf_id2nr(qi, di->di_tv.vval.v_number);
5562 	}
5563 	else
5564 	    qf_idx = INVALID_QFIDX;
5565     }
5566 
5567     return qf_idx;
5568 }
5569 
5570 /*
5571  * Return default values for quickfix list properties in retdict.
5572  */
5573     static int
5574 qf_getprop_defaults(qf_info_T *qi, int flags, dict_T *retdict)
5575 {
5576     int		status = OK;
5577 
5578     if (flags & QF_GETLIST_TITLE)
5579 	status = dict_add_string(retdict, "title", (char_u *)"");
5580     if ((status == OK) && (flags & QF_GETLIST_ITEMS))
5581     {
5582 	list_T	*l = list_alloc();
5583 	if (l != NULL)
5584 	    status = dict_add_list(retdict, "items", l);
5585 	else
5586 	    status = FAIL;
5587     }
5588     if ((status == OK) && (flags & QF_GETLIST_NR))
5589 	status = dict_add_number(retdict, "nr", 0);
5590     if ((status == OK) && (flags & QF_GETLIST_WINID))
5591 	status = dict_add_number(retdict, "winid", qf_winid(qi));
5592     if ((status == OK) && (flags & QF_GETLIST_CONTEXT))
5593 	status = dict_add_string(retdict, "context", (char_u *)"");
5594     if ((status == OK) && (flags & QF_GETLIST_ID))
5595 	status = dict_add_number(retdict, "id", 0);
5596     if ((status == OK) && (flags & QF_GETLIST_IDX))
5597 	status = dict_add_number(retdict, "idx", 0);
5598     if ((status == OK) && (flags & QF_GETLIST_SIZE))
5599 	status = dict_add_number(retdict, "size", 0);
5600     if ((status == OK) && (flags & QF_GETLIST_TICK))
5601 	status = dict_add_number(retdict, "changedtick", 0);
5602 
5603     return status;
5604 }
5605 
5606 /*
5607  * Return the quickfix list title as 'title' in retdict
5608  */
5609     static int
5610 qf_getprop_title(qf_info_T *qi, int qf_idx, dict_T *retdict)
5611 {
5612     return dict_add_string(retdict, "title", qi->qf_lists[qf_idx].qf_title);
5613 }
5614 
5615 /*
5616  * Return the quickfix list items/entries as 'items' in retdict
5617  */
5618     static int
5619 qf_getprop_items(qf_info_T *qi, int qf_idx, dict_T *retdict)
5620 {
5621     int		status = OK;
5622     list_T	*l = list_alloc();
5623     if (l != NULL)
5624     {
5625 	(void)get_errorlist(qi, NULL, qf_idx, l);
5626 	dict_add_list(retdict, "items", l);
5627     }
5628     else
5629 	status = FAIL;
5630 
5631     return status;
5632 }
5633 
5634 /*
5635  * Return the quickfix list context (if any) as 'context' in retdict.
5636  */
5637     static int
5638 qf_getprop_ctx(qf_info_T *qi, int qf_idx, dict_T *retdict)
5639 {
5640     int		status;
5641     dictitem_T	*di;
5642 
5643     if (qi->qf_lists[qf_idx].qf_ctx != NULL)
5644     {
5645 	di = dictitem_alloc((char_u *)"context");
5646 	if (di != NULL)
5647 	{
5648 	    copy_tv(qi->qf_lists[qf_idx].qf_ctx, &di->di_tv);
5649 	    status = dict_add(retdict, di);
5650 	    if (status == FAIL)
5651 		dictitem_free(di);
5652 	}
5653 	else
5654 	    status = FAIL;
5655     }
5656     else
5657 	status = dict_add_string(retdict, "context", (char_u *)"");
5658 
5659     return status;
5660 }
5661 
5662 /*
5663  * Return the quickfix list index as 'idx' in retdict
5664  */
5665     static int
5666 qf_getprop_idx(qf_info_T *qi, int qf_idx, dict_T *retdict)
5667 {
5668     int idx = qi->qf_lists[qf_idx].qf_index;
5669     if (qi->qf_lists[qf_idx].qf_count == 0)
5670 	/* For empty lists, qf_index is set to 1 */
5671 	idx = 0;
5672     return dict_add_number(retdict, "idx", idx);
5673 }
5674 
5675 /*
5676  * Return quickfix/location list details (title) as a
5677  * dictionary. 'what' contains the details to return. If 'list_idx' is -1,
5678  * then current list is used. Otherwise the specified list is used.
5679  */
5680     int
5681 qf_get_properties(win_T *wp, dict_T *what, dict_T *retdict)
5682 {
5683     qf_info_T	*qi = &ql_info;
5684     int		status = OK;
5685     int		qf_idx;
5686     dictitem_T	*di;
5687     int		flags = QF_GETLIST_NONE;
5688 
5689     if ((di = dict_find(what, (char_u *)"lines", -1)) != NULL)
5690 	return qf_get_list_from_lines(what, di, retdict);
5691 
5692     if (wp != NULL)
5693 	qi = GET_LOC_LIST(wp);
5694 
5695     flags = qf_getprop_keys2flags(what);
5696 
5697     if (qi != NULL && qi->qf_listcount != 0)
5698 	qf_idx = qf_getprop_qfidx(qi, what);
5699 
5700     /* List is not present or is empty */
5701     if (qi == NULL || qi->qf_listcount == 0 || qf_idx == INVALID_QFIDX)
5702 	return qf_getprop_defaults(qi, flags, retdict);
5703 
5704     if (flags & QF_GETLIST_TITLE)
5705 	status = qf_getprop_title(qi, qf_idx, retdict);
5706     if ((status == OK) && (flags & QF_GETLIST_NR))
5707 	status = dict_add_number(retdict, "nr", qf_idx + 1);
5708     if ((status == OK) && (flags & QF_GETLIST_WINID))
5709 	status = dict_add_number(retdict, "winid", qf_winid(qi));
5710     if ((status == OK) && (flags & QF_GETLIST_ITEMS))
5711 	status = qf_getprop_items(qi, qf_idx, retdict);
5712     if ((status == OK) && (flags & QF_GETLIST_CONTEXT))
5713 	status = qf_getprop_ctx(qi, qf_idx, retdict);
5714     if ((status == OK) && (flags & QF_GETLIST_ID))
5715 	status = dict_add_number(retdict, "id", qi->qf_lists[qf_idx].qf_id);
5716     if ((status == OK) && (flags & QF_GETLIST_IDX))
5717 	status = qf_getprop_idx(qi, qf_idx, retdict);
5718     if ((status == OK) && (flags & QF_GETLIST_SIZE))
5719 	status = dict_add_number(retdict, "size",
5720 					      qi->qf_lists[qf_idx].qf_count);
5721     if ((status == OK) && (flags & QF_GETLIST_TICK))
5722 	status = dict_add_number(retdict, "changedtick",
5723 					qi->qf_lists[qf_idx].qf_changedtick);
5724 
5725     return status;
5726 }
5727 
5728 /*
5729  * Add list of entries to quickfix/location list. Each list entry is
5730  * a dictionary with item information.
5731  */
5732     static int
5733 qf_add_entries(
5734 	qf_info_T	*qi,
5735 	int		qf_idx,
5736 	list_T		*list,
5737 	char_u		*title,
5738 	int		action)
5739 {
5740     listitem_T	*li;
5741     dict_T	*d;
5742     char_u	*filename, *module, *pattern, *text, *type;
5743     int		bufnum;
5744     long	lnum;
5745     int		col, nr;
5746     int		vcol;
5747     qfline_T	*old_last = NULL;
5748     int		valid, status;
5749     int		retval = OK;
5750     int		did_bufnr_emsg = FALSE;
5751 
5752     if (action == ' ' || qf_idx == qi->qf_listcount)
5753     {
5754 	/* make place for a new list */
5755 	qf_new_list(qi, title);
5756 	qf_idx = qi->qf_curlist;
5757     }
5758     else if (action == 'a' && qi->qf_lists[qf_idx].qf_count > 0)
5759 	/* Adding to existing list, use last entry. */
5760 	old_last = qi->qf_lists[qf_idx].qf_last;
5761     else if (action == 'r')
5762     {
5763 	qf_free_items(qi, qf_idx);
5764 	qf_store_title(qi, qf_idx, title);
5765     }
5766 
5767     for (li = list->lv_first; li != NULL; li = li->li_next)
5768     {
5769 	if (li->li_tv.v_type != VAR_DICT)
5770 	    continue; /* Skip non-dict items */
5771 
5772 	d = li->li_tv.vval.v_dict;
5773 	if (d == NULL)
5774 	    continue;
5775 
5776 	filename = get_dict_string(d, (char_u *)"filename", TRUE);
5777 	module = get_dict_string(d, (char_u *)"module", TRUE);
5778 	bufnum = (int)get_dict_number(d, (char_u *)"bufnr");
5779 	lnum = (int)get_dict_number(d, (char_u *)"lnum");
5780 	col = (int)get_dict_number(d, (char_u *)"col");
5781 	vcol = (int)get_dict_number(d, (char_u *)"vcol");
5782 	nr = (int)get_dict_number(d, (char_u *)"nr");
5783 	type = get_dict_string(d, (char_u *)"type", TRUE);
5784 	pattern = get_dict_string(d, (char_u *)"pattern", TRUE);
5785 	text = get_dict_string(d, (char_u *)"text", TRUE);
5786 	if (text == NULL)
5787 	    text = vim_strsave((char_u *)"");
5788 
5789 	valid = TRUE;
5790 	if ((filename == NULL && bufnum == 0) || (lnum == 0 && pattern == NULL))
5791 	    valid = FALSE;
5792 
5793 	/* Mark entries with non-existing buffer number as not valid. Give the
5794 	 * error message only once. */
5795 	if (bufnum != 0 && (buflist_findnr(bufnum) == NULL))
5796 	{
5797 	    if (!did_bufnr_emsg)
5798 	    {
5799 		did_bufnr_emsg = TRUE;
5800 		EMSGN(_("E92: Buffer %ld not found"), bufnum);
5801 	    }
5802 	    valid = FALSE;
5803 	    bufnum = 0;
5804 	}
5805 
5806 	/* If the 'valid' field is present it overrules the detected value. */
5807 	if ((dict_find(d, (char_u *)"valid", -1)) != NULL)
5808 	    valid = (int)get_dict_number(d, (char_u *)"valid");
5809 
5810 	status =  qf_add_entry(qi,
5811 			       qf_idx,
5812 			       NULL,	    /* dir */
5813 			       filename,
5814 			       module,
5815 			       bufnum,
5816 			       text,
5817 			       lnum,
5818 			       col,
5819 			       vcol,	    /* vis_col */
5820 			       pattern,	    /* search pattern */
5821 			       nr,
5822 			       type == NULL ? NUL : *type,
5823 			       valid);
5824 
5825 	vim_free(filename);
5826 	vim_free(module);
5827 	vim_free(pattern);
5828 	vim_free(text);
5829 	vim_free(type);
5830 
5831 	if (status == FAIL)
5832 	{
5833 	    retval = FAIL;
5834 	    break;
5835 	}
5836     }
5837 
5838     if (qi->qf_lists[qf_idx].qf_index == 0)
5839 	/* no valid entry */
5840 	qi->qf_lists[qf_idx].qf_nonevalid = TRUE;
5841     else
5842 	qi->qf_lists[qf_idx].qf_nonevalid = FALSE;
5843     if (action != 'a')
5844     {
5845 	qi->qf_lists[qf_idx].qf_ptr =
5846 	    qi->qf_lists[qf_idx].qf_start;
5847 	if (qi->qf_lists[qf_idx].qf_count > 0)
5848 	    qi->qf_lists[qf_idx].qf_index = 1;
5849     }
5850 
5851     /* Don't update the cursor in quickfix window when appending entries */
5852     qf_update_buffer(qi, old_last);
5853 
5854     return retval;
5855 }
5856 
5857 /*
5858  * Get the quickfix list index from 'nr' or 'id'
5859  */
5860     static int
5861 qf_setprop_get_qfidx(
5862 	qf_info_T	*qi,
5863 	dict_T		*what,
5864 	int		action,
5865 	int		*newlist)
5866 {
5867     dictitem_T	*di;
5868     int		qf_idx = qi->qf_curlist;    /* default is the current list */
5869 
5870     if ((di = dict_find(what, (char_u *)"nr", -1)) != NULL)
5871     {
5872 	/* Use the specified quickfix/location list */
5873 	if (di->di_tv.v_type == VAR_NUMBER)
5874 	{
5875 	    /* for zero use the current list */
5876 	    if (di->di_tv.vval.v_number != 0)
5877 		qf_idx = di->di_tv.vval.v_number - 1;
5878 
5879 	    if ((action == ' ' || action == 'a') && qf_idx == qi->qf_listcount)
5880 	    {
5881 		/*
5882 		 * When creating a new list, accept qf_idx pointing to the next
5883 		 * non-available list and add the new list at the end of the
5884 		 * stack.
5885 		 */
5886 		*newlist = TRUE;
5887 		qf_idx = qi->qf_listcount > 0 ? qi->qf_listcount - 1 : 0;
5888 	    }
5889 	    else if (qf_idx < 0 || qf_idx >= qi->qf_listcount)
5890 		return INVALID_QFIDX;
5891 	    else if (action != ' ')
5892 		*newlist = FALSE;	/* use the specified list */
5893 	}
5894 	else if (di->di_tv.v_type == VAR_STRING
5895 		&& di->di_tv.vval.v_string != NULL
5896 		&& STRCMP(di->di_tv.vval.v_string, "$") == 0)
5897 	{
5898 	    if (qi->qf_listcount > 0)
5899 		qf_idx = qi->qf_listcount - 1;
5900 	    else if (*newlist)
5901 		qf_idx = 0;
5902 	    else
5903 		return INVALID_QFIDX;
5904 	}
5905 	else
5906 	    return INVALID_QFIDX;
5907     }
5908 
5909     if (!*newlist && (di = dict_find(what, (char_u *)"id", -1)) != NULL)
5910     {
5911 	/* Use the quickfix/location list with the specified id */
5912 	if (di->di_tv.v_type != VAR_NUMBER)
5913 	    return INVALID_QFIDX;
5914 
5915 	return qf_id2nr(qi, di->di_tv.vval.v_number);
5916     }
5917 
5918     return qf_idx;
5919 }
5920 
5921 /*
5922  * Set the quickfix list title.
5923  */
5924     static int
5925 qf_setprop_title(qf_info_T *qi, int qf_idx, dict_T *what, dictitem_T *di)
5926 {
5927     if (di->di_tv.v_type != VAR_STRING)
5928 	return FAIL;
5929 
5930     vim_free(qi->qf_lists[qf_idx].qf_title);
5931     qi->qf_lists[qf_idx].qf_title =
5932 	get_dict_string(what, (char_u *)"title", TRUE);
5933     if (qf_idx == qi->qf_curlist)
5934 	qf_update_win_titlevar(qi);
5935 
5936     return OK;
5937 }
5938 
5939 /*
5940  * Set quickfix list items/entries.
5941  */
5942     static int
5943 qf_setprop_items(qf_info_T *qi, int qf_idx, dictitem_T *di, int action)
5944 {
5945     int		retval = FAIL;
5946     char_u	*title_save;
5947 
5948     if (di->di_tv.v_type != VAR_LIST)
5949 	return FAIL;
5950 
5951     title_save = vim_strsave(qi->qf_lists[qf_idx].qf_title);
5952     retval = qf_add_entries(qi, qf_idx, di->di_tv.vval.v_list,
5953 	    title_save, action == ' ' ? 'a' : action);
5954     vim_free(title_save);
5955 
5956     return retval;
5957 }
5958 
5959 /*
5960  * Set quickfix list items/entries from a list of lines.
5961  */
5962     static int
5963 qf_setprop_items_from_lines(
5964 	qf_info_T	*qi,
5965 	int		qf_idx,
5966 	dict_T		*what,
5967 	dictitem_T	*di,
5968 	int		action)
5969 {
5970     char_u	*errorformat = p_efm;
5971     dictitem_T	*efm_di;
5972     int		retval = FAIL;
5973 
5974     /* Use the user supplied errorformat settings (if present) */
5975     if ((efm_di = dict_find(what, (char_u *)"efm", -1)) != NULL)
5976     {
5977 	if (efm_di->di_tv.v_type != VAR_STRING ||
5978 		efm_di->di_tv.vval.v_string == NULL)
5979 	    return FAIL;
5980 	errorformat = efm_di->di_tv.vval.v_string;
5981     }
5982 
5983     /* Only a List value is supported */
5984     if (di->di_tv.v_type != VAR_LIST || di->di_tv.vval.v_list == NULL)
5985 	return FAIL;
5986 
5987     if (action == 'r')
5988 	qf_free_items(qi, qf_idx);
5989     if (qf_init_ext(qi, qf_idx, NULL, NULL, &di->di_tv, errorformat,
5990 		FALSE, (linenr_T)0, (linenr_T)0, NULL, NULL) > 0)
5991 	retval = OK;
5992 
5993     return retval;
5994 }
5995 
5996 /*
5997  * Set quickfix list context.
5998  */
5999     static int
6000 qf_setprop_context(qf_info_T *qi, int qf_idx, dictitem_T *di)
6001 {
6002     typval_T	*ctx;
6003 
6004     free_tv(qi->qf_lists[qf_idx].qf_ctx);
6005     ctx =  alloc_tv();
6006     if (ctx != NULL)
6007 	copy_tv(&di->di_tv, ctx);
6008     qi->qf_lists[qf_idx].qf_ctx = ctx;
6009 
6010     return OK;
6011 }
6012 
6013 /*
6014  * Set quickfix/location list properties (title, items, context).
6015  * Also used to add items from parsing a list of lines.
6016  * Used by the setqflist() and setloclist() Vim script functions.
6017  */
6018     static int
6019 qf_set_properties(qf_info_T *qi, dict_T *what, int action, char_u *title)
6020 {
6021     dictitem_T	*di;
6022     int		retval = FAIL;
6023     int		qf_idx;
6024     int		newlist = FALSE;
6025 
6026     if (action == ' ' || qi->qf_curlist == qi->qf_listcount)
6027 	newlist = TRUE;
6028 
6029     qf_idx = qf_setprop_get_qfidx(qi, what, action, &newlist);
6030     if (qf_idx == INVALID_QFIDX)	/* List not found */
6031 	return FAIL;
6032 
6033     if (newlist)
6034     {
6035 	qi->qf_curlist = qf_idx;
6036 	qf_new_list(qi, title);
6037 	qf_idx = qi->qf_curlist;
6038     }
6039 
6040     if ((di = dict_find(what, (char_u *)"title", -1)) != NULL)
6041 	retval = qf_setprop_title(qi, qf_idx, what, di);
6042     if ((di = dict_find(what, (char_u *)"items", -1)) != NULL)
6043 	retval = qf_setprop_items(qi, qf_idx, di, action);
6044     if ((di = dict_find(what, (char_u *)"lines", -1)) != NULL)
6045 	retval = qf_setprop_items_from_lines(qi, qf_idx, what, di, action);
6046     if ((di = dict_find(what, (char_u *)"context", -1)) != NULL)
6047 	retval = qf_setprop_context(qi, qf_idx, di);
6048 
6049     if (retval == OK)
6050 	qf_list_changed(qi, qf_idx);
6051 
6052     return retval;
6053 }
6054 
6055 /*
6056  * Find the non-location list window with the specified location list.
6057  */
6058     static win_T *
6059 find_win_with_ll(qf_info_T *qi)
6060 {
6061     win_T	*wp = NULL;
6062 
6063     FOR_ALL_WINDOWS(wp)
6064 	if ((wp->w_llist == qi) && !bt_quickfix(wp->w_buffer))
6065 	    return wp;
6066 
6067     return NULL;
6068 }
6069 
6070 /*
6071  * Free the entire quickfix/location list stack.
6072  * If the quickfix/location list window is open, then clear it.
6073  */
6074     static void
6075 qf_free_stack(win_T *wp, qf_info_T *qi)
6076 {
6077     win_T	*qfwin = qf_find_win(qi);
6078     win_T	*llwin = NULL;
6079     win_T	*orig_wp = wp;
6080 
6081     if (qfwin != NULL)
6082     {
6083 	/* If the quickfix/location list window is open, then clear it */
6084 	if (qi->qf_curlist < qi->qf_listcount)
6085 	    qf_free(qi, qi->qf_curlist);
6086 	qf_update_buffer(qi, NULL);
6087     }
6088 
6089     if (wp != NULL && IS_LL_WINDOW(wp))
6090     {
6091 	/* If in the location list window, then use the non-location list
6092 	 * window with this location list (if present)
6093 	 */
6094 	llwin = find_win_with_ll(qi);
6095 	if (llwin != NULL)
6096 	    wp = llwin;
6097     }
6098 
6099     qf_free_all(wp);
6100     if (wp == NULL)
6101     {
6102 	/* quickfix list */
6103 	qi->qf_curlist = 0;
6104 	qi->qf_listcount = 0;
6105     }
6106     else if (IS_LL_WINDOW(orig_wp))
6107     {
6108 	/* If the location list window is open, then create a new empty
6109 	 * location list */
6110 	qf_info_T *new_ll = ll_new_list();
6111 
6112 	/* first free the list reference in the location list window */
6113 	ll_free_all(&orig_wp->w_llist_ref);
6114 
6115 	orig_wp->w_llist_ref = new_ll;
6116 	if (llwin != NULL)
6117 	{
6118 	    llwin->w_llist = new_ll;
6119 	    new_ll->qf_refcount++;
6120 	}
6121     }
6122 }
6123 
6124 /*
6125  * Populate the quickfix list with the items supplied in the list
6126  * of dictionaries. "title" will be copied to w:quickfix_title.
6127  * "action" is 'a' for add, 'r' for replace.  Otherwise create a new list.
6128  */
6129     int
6130 set_errorlist(
6131 	win_T	*wp,
6132 	list_T	*list,
6133 	int	action,
6134 	char_u	*title,
6135 	dict_T	*what)
6136 {
6137     qf_info_T	*qi = &ql_info;
6138     int		retval = OK;
6139 
6140     if (wp != NULL)
6141     {
6142 	qi = ll_get_or_alloc_list(wp);
6143 	if (qi == NULL)
6144 	    return FAIL;
6145     }
6146 
6147     if (action == 'f')
6148     {
6149 	/* Free the entire quickfix or location list stack */
6150 	qf_free_stack(wp, qi);
6151     }
6152     else if (what != NULL)
6153 	retval = qf_set_properties(qi, what, action, title);
6154     else
6155     {
6156 	retval = qf_add_entries(qi, qi->qf_curlist, list, title, action);
6157 	if (retval == OK)
6158 	    qf_list_changed(qi, qi->qf_curlist);
6159     }
6160 
6161     return retval;
6162 }
6163 
6164 /*
6165  * Mark the context as in use for all the lists in a quickfix stack.
6166  */
6167     static int
6168 mark_quickfix_ctx(qf_info_T *qi, int copyID)
6169 {
6170     int		i;
6171     int		abort = FALSE;
6172     typval_T	*ctx;
6173 
6174     for (i = 0; i < LISTCOUNT && !abort; ++i)
6175     {
6176 	ctx = qi->qf_lists[i].qf_ctx;
6177 	if (ctx != NULL && ctx->v_type != VAR_NUMBER
6178 		&& ctx->v_type != VAR_STRING && ctx->v_type != VAR_FLOAT)
6179 	    abort = set_ref_in_item(ctx, copyID, NULL, NULL);
6180     }
6181 
6182     return abort;
6183 }
6184 
6185 /*
6186  * Mark the context of the quickfix list and the location lists (if present) as
6187  * "in use". So that garbage collection doesn't free the context.
6188  */
6189     int
6190 set_ref_in_quickfix(int copyID)
6191 {
6192     int		abort = FALSE;
6193     tabpage_T	*tp;
6194     win_T	*win;
6195 
6196     abort = mark_quickfix_ctx(&ql_info, copyID);
6197     if (abort)
6198 	return abort;
6199 
6200     FOR_ALL_TAB_WINDOWS(tp, win)
6201     {
6202 	if (win->w_llist != NULL)
6203 	{
6204 	    abort = mark_quickfix_ctx(win->w_llist, copyID);
6205 	    if (abort)
6206 		return abort;
6207 	}
6208 	if (IS_LL_WINDOW(win) && (win->w_llist_ref->qf_refcount == 1))
6209 	{
6210 	    /* In a location list window and none of the other windows is
6211 	     * referring to this location list. Mark the location list
6212 	     * context as still in use.
6213 	     */
6214 	    abort = mark_quickfix_ctx(win->w_llist_ref, copyID);
6215 	    if (abort)
6216 		return abort;
6217 	}
6218     }
6219 
6220     return abort;
6221 }
6222 #endif
6223 
6224 /*
6225  * ":[range]cbuffer [bufnr]" command.
6226  * ":[range]caddbuffer [bufnr]" command.
6227  * ":[range]cgetbuffer [bufnr]" command.
6228  * ":[range]lbuffer [bufnr]" command.
6229  * ":[range]laddbuffer [bufnr]" command.
6230  * ":[range]lgetbuffer [bufnr]" command.
6231  */
6232     void
6233 ex_cbuffer(exarg_T *eap)
6234 {
6235     buf_T	*buf = NULL;
6236     qf_info_T	*qi = &ql_info;
6237     char_u	*au_name = NULL;
6238     int		res;
6239     int_u	save_qfid;
6240     win_T	*wp = NULL;
6241 
6242     switch (eap->cmdidx)
6243     {
6244 	case CMD_cbuffer:	au_name = (char_u *)"cbuffer"; break;
6245 	case CMD_cgetbuffer:	au_name = (char_u *)"cgetbuffer"; break;
6246 	case CMD_caddbuffer:	au_name = (char_u *)"caddbuffer"; break;
6247 	case CMD_lbuffer:	au_name = (char_u *)"lbuffer"; break;
6248 	case CMD_lgetbuffer:	au_name = (char_u *)"lgetbuffer"; break;
6249 	case CMD_laddbuffer:	au_name = (char_u *)"laddbuffer"; break;
6250 	default: break;
6251     }
6252     if (au_name != NULL && apply_autocmds(EVENT_QUICKFIXCMDPRE, au_name,
6253 					       curbuf->b_fname, TRUE, curbuf))
6254     {
6255 #ifdef FEAT_EVAL
6256 	if (aborting())
6257 	    return;
6258 #endif
6259     }
6260 
6261     /* Must come after autocommands. */
6262     if (eap->cmdidx == CMD_lbuffer
6263 	    || eap->cmdidx == CMD_lgetbuffer
6264 	    || eap->cmdidx == CMD_laddbuffer)
6265     {
6266 	qi = ll_get_or_alloc_list(curwin);
6267 	if (qi == NULL)
6268 	    return;
6269 	wp = curwin;
6270     }
6271 
6272     if (*eap->arg == NUL)
6273 	buf = curbuf;
6274     else if (*skipwhite(skipdigits(eap->arg)) == NUL)
6275 	buf = buflist_findnr(atoi((char *)eap->arg));
6276     if (buf == NULL)
6277 	EMSG(_(e_invarg));
6278     else if (buf->b_ml.ml_mfp == NULL)
6279 	EMSG(_("E681: Buffer is not loaded"));
6280     else
6281     {
6282 	if (eap->addr_count == 0)
6283 	{
6284 	    eap->line1 = 1;
6285 	    eap->line2 = buf->b_ml.ml_line_count;
6286 	}
6287 	if (eap->line1 < 1 || eap->line1 > buf->b_ml.ml_line_count
6288 		|| eap->line2 < 1 || eap->line2 > buf->b_ml.ml_line_count)
6289 	    EMSG(_(e_invrange));
6290 	else
6291 	{
6292 	    char_u *qf_title = qf_cmdtitle(*eap->cmdlinep);
6293 
6294 	    if (buf->b_sfname)
6295 	    {
6296 		vim_snprintf((char *)IObuff, IOSIZE, "%s (%s)",
6297 				     (char *)qf_title, (char *)buf->b_sfname);
6298 		qf_title = IObuff;
6299 	    }
6300 
6301 	    res = qf_init_ext(qi, qi->qf_curlist, NULL, buf, NULL, p_efm,
6302 			    (eap->cmdidx != CMD_caddbuffer
6303 			     && eap->cmdidx != CMD_laddbuffer),
6304 						   eap->line1, eap->line2,
6305 						   qf_title, NULL);
6306 	    if (res >= 0)
6307 		qf_list_changed(qi, qi->qf_curlist);
6308 
6309 	    // Remember the current quickfix list identifier, so that we can
6310 	    // check for autocommands changing the current quickfix list.
6311 	    save_qfid = qi->qf_lists[qi->qf_curlist].qf_id;
6312 	    if (au_name != NULL)
6313 	    {
6314 		buf_T *curbuf_old = curbuf;
6315 
6316 		apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
6317 						curbuf->b_fname, TRUE, curbuf);
6318 		if (curbuf != curbuf_old)
6319 		    // Autocommands changed buffer, don't jump now, "qi" may
6320 		    // be invalid.
6321 		    res = 0;
6322 	    }
6323 	    // Jump to the first error for a new list and if autocmds didn't
6324 	    // free the list.
6325 	    if (res > 0 && (eap->cmdidx == CMD_cbuffer ||
6326 						eap->cmdidx == CMD_lbuffer)
6327 		    && qflist_valid(wp, save_qfid))
6328 	    {
6329 		// If autocommands changed the current list, then restore it
6330 		if (qi->qf_lists[qi->qf_curlist].qf_id != save_qfid)
6331 		    qi->qf_curlist = qf_id2nr(qi, save_qfid);
6332 		qf_jump(qi, 0, 0, eap->forceit);  /* display first error */
6333 	    }
6334 	}
6335     }
6336 }
6337 
6338 #if defined(FEAT_EVAL) || defined(PROTO)
6339 /*
6340  * ":cexpr {expr}", ":cgetexpr {expr}", ":caddexpr {expr}" command.
6341  * ":lexpr {expr}", ":lgetexpr {expr}", ":laddexpr {expr}" command.
6342  */
6343     void
6344 ex_cexpr(exarg_T *eap)
6345 {
6346     typval_T	*tv;
6347     qf_info_T	*qi = &ql_info;
6348     char_u	*au_name = NULL;
6349     int		res;
6350     int_u	save_qfid;
6351     win_T	*wp = NULL;
6352 
6353     switch (eap->cmdidx)
6354     {
6355 	case CMD_cexpr:	    au_name = (char_u *)"cexpr"; break;
6356 	case CMD_cgetexpr:  au_name = (char_u *)"cgetexpr"; break;
6357 	case CMD_caddexpr:  au_name = (char_u *)"caddexpr"; break;
6358 	case CMD_lexpr:	    au_name = (char_u *)"lexpr"; break;
6359 	case CMD_lgetexpr:  au_name = (char_u *)"lgetexpr"; break;
6360 	case CMD_laddexpr:  au_name = (char_u *)"laddexpr"; break;
6361 	default: break;
6362     }
6363     if (au_name != NULL && apply_autocmds(EVENT_QUICKFIXCMDPRE, au_name,
6364 					       curbuf->b_fname, TRUE, curbuf))
6365     {
6366 #ifdef FEAT_EVAL
6367 	if (aborting())
6368 	    return;
6369 #endif
6370     }
6371 
6372     if (eap->cmdidx == CMD_lexpr
6373 	    || eap->cmdidx == CMD_lgetexpr
6374 	    || eap->cmdidx == CMD_laddexpr)
6375     {
6376 	qi = ll_get_or_alloc_list(curwin);
6377 	if (qi == NULL)
6378 	    return;
6379 	wp = curwin;
6380     }
6381 
6382     /* Evaluate the expression.  When the result is a string or a list we can
6383      * use it to fill the errorlist. */
6384     tv = eval_expr(eap->arg, NULL);
6385     if (tv != NULL)
6386     {
6387 	if ((tv->v_type == VAR_STRING && tv->vval.v_string != NULL)
6388 		|| (tv->v_type == VAR_LIST && tv->vval.v_list != NULL))
6389 	{
6390 	    res = qf_init_ext(qi, qi->qf_curlist, NULL, NULL, tv, p_efm,
6391 			    (eap->cmdidx != CMD_caddexpr
6392 			     && eap->cmdidx != CMD_laddexpr),
6393 				 (linenr_T)0, (linenr_T)0,
6394 				 qf_cmdtitle(*eap->cmdlinep), NULL);
6395 	    if (res >= 0)
6396 		qf_list_changed(qi, qi->qf_curlist);
6397 
6398 	    // Remember the current quickfix list identifier, so that we can
6399 	    // check for autocommands changing the current quickfix list.
6400 	    save_qfid = qi->qf_lists[qi->qf_curlist].qf_id;
6401 	    if (au_name != NULL)
6402 		apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
6403 						curbuf->b_fname, TRUE, curbuf);
6404 
6405 	    // Jump to the first error for a new list and if autocmds didn't
6406 	    // free the list.
6407 	    if (res > 0 && (eap->cmdidx == CMD_cexpr
6408 						   || eap->cmdidx == CMD_lexpr)
6409 		    && qflist_valid(wp, save_qfid))
6410 	    {
6411 		// If autocommands changed the current list, then restore it
6412 		if (qi->qf_lists[qi->qf_curlist].qf_id != save_qfid)
6413 		    qi->qf_curlist = qf_id2nr(qi, save_qfid);
6414 		qf_jump(qi, 0, 0, eap->forceit);
6415 	    }
6416 	}
6417 	else
6418 	    EMSG(_("E777: String or List expected"));
6419 	free_tv(tv);
6420     }
6421 }
6422 #endif
6423 
6424 /*
6425  * Get the location list for ":lhelpgrep"
6426  */
6427     static qf_info_T *
6428 hgr_get_ll(int *new_ll)
6429 {
6430     win_T	*wp;
6431     qf_info_T	*qi;
6432 
6433     /* If the current window is a help window, then use it */
6434     if (bt_help(curwin->w_buffer))
6435 	wp = curwin;
6436     else
6437 	/* Find an existing help window */
6438 	wp = qf_find_help_win();
6439 
6440     if (wp == NULL)	    /* Help window not found */
6441 	qi = NULL;
6442     else
6443 	qi = wp->w_llist;
6444 
6445     if (qi == NULL)
6446     {
6447 	/* Allocate a new location list for help text matches */
6448 	if ((qi = ll_new_list()) == NULL)
6449 	    return NULL;
6450 	*new_ll = TRUE;
6451     }
6452 
6453     return qi;
6454 }
6455 
6456 /*
6457  * Search for a pattern in a help file.
6458  */
6459     static void
6460 hgr_search_file(
6461 	qf_info_T *qi,
6462 	char_u *fname,
6463 #ifdef FEAT_MBYTE
6464 	vimconv_T *p_vc,
6465 #endif
6466 	regmatch_T *p_regmatch)
6467 {
6468     FILE	*fd;
6469     long	lnum;
6470 
6471     fd = mch_fopen((char *)fname, "r");
6472     if (fd == NULL)
6473 	return;
6474 
6475     lnum = 1;
6476     while (!vim_fgets(IObuff, IOSIZE, fd) && !got_int)
6477     {
6478 	char_u    *line = IObuff;
6479 #ifdef FEAT_MBYTE
6480 	/* Convert a line if 'encoding' is not utf-8 and
6481 	 * the line contains a non-ASCII character. */
6482 	if (p_vc->vc_type != CONV_NONE
6483 		&& has_non_ascii(IObuff))
6484 	{
6485 	    line = string_convert(p_vc, IObuff, NULL);
6486 	    if (line == NULL)
6487 		line = IObuff;
6488 	}
6489 #endif
6490 
6491 	if (vim_regexec(p_regmatch, line, (colnr_T)0))
6492 	{
6493 	    int	l = (int)STRLEN(line);
6494 
6495 	    /* remove trailing CR, LF, spaces, etc. */
6496 	    while (l > 0 && line[l - 1] <= ' ')
6497 		line[--l] = NUL;
6498 
6499 	    if (qf_add_entry(qi,
6500 			qi->qf_curlist,
6501 			NULL,	/* dir */
6502 			fname,
6503 			NULL,
6504 			0,
6505 			line,
6506 			lnum,
6507 			(int)(p_regmatch->startp[0] - line)
6508 			+ 1, /* col */
6509 			FALSE,	/* vis_col */
6510 			NULL,	/* search pattern */
6511 			0,		/* nr */
6512 			1,		/* type */
6513 			TRUE	/* valid */
6514 			) == FAIL)
6515 	    {
6516 		got_int = TRUE;
6517 #ifdef FEAT_MBYTE
6518 		if (line != IObuff)
6519 		    vim_free(line);
6520 #endif
6521 		break;
6522 	    }
6523 	}
6524 #ifdef FEAT_MBYTE
6525 	if (line != IObuff)
6526 	    vim_free(line);
6527 #endif
6528 	++lnum;
6529 	line_breakcheck();
6530     }
6531     fclose(fd);
6532 }
6533 
6534 /*
6535  * Search for a pattern in all the help files in the doc directory under
6536  * the given directory.
6537  */
6538     static void
6539 hgr_search_files_in_dir(
6540 	qf_info_T *qi,
6541 	char_u *dirname,
6542 	regmatch_T *p_regmatch
6543 #ifdef FEAT_MBYTE
6544 	, vimconv_T *p_vc
6545 #endif
6546 #ifdef FEAT_MULTI_LANG
6547 	, char_u *lang
6548 #endif
6549 	)
6550 {
6551     int		fcount;
6552     char_u	**fnames;
6553     int		fi;
6554 
6555     /* Find all "*.txt" and "*.??x" files in the "doc" directory. */
6556     add_pathsep(dirname);
6557     STRCAT(dirname, "doc/*.\\(txt\\|??x\\)");
6558     if (gen_expand_wildcards(1, &dirname, &fcount,
6559 		&fnames, EW_FILE|EW_SILENT) == OK
6560 	    && fcount > 0)
6561     {
6562 	for (fi = 0; fi < fcount && !got_int; ++fi)
6563 	{
6564 #ifdef FEAT_MULTI_LANG
6565 	    /* Skip files for a different language. */
6566 	    if (lang != NULL
6567 		    && STRNICMP(lang, fnames[fi]
6568 				    + STRLEN(fnames[fi]) - 3, 2) != 0
6569 		    && !(STRNICMP(lang, "en", 2) == 0
6570 			&& STRNICMP("txt", fnames[fi]
6571 			    + STRLEN(fnames[fi]) - 3, 3) == 0))
6572 		continue;
6573 #endif
6574 
6575 	    hgr_search_file(qi, fnames[fi],
6576 #ifdef FEAT_MBYTE
6577 		    p_vc,
6578 #endif
6579 		    p_regmatch);
6580 	}
6581 	FreeWild(fcount, fnames);
6582     }
6583 }
6584 
6585 /*
6586  * Search for a pattern in all the help files in the 'runtimepath'
6587  * and add the matches to a quickfix list.
6588  * 'arg' is the language specifier.  If supplied, then only matches in the
6589  * specified language are found.
6590  */
6591     static void
6592 hgr_search_in_rtp(qf_info_T *qi, regmatch_T *p_regmatch, char_u *arg)
6593 {
6594     char_u	*p;
6595 #ifdef FEAT_MULTI_LANG
6596     char_u	*lang;
6597 #endif
6598 
6599 #ifdef FEAT_MBYTE
6600     vimconv_T	vc;
6601 
6602     /* Help files are in utf-8 or latin1, convert lines when 'encoding'
6603      * differs. */
6604     vc.vc_type = CONV_NONE;
6605     if (!enc_utf8)
6606 	convert_setup(&vc, (char_u *)"utf-8", p_enc);
6607 #endif
6608 
6609 #ifdef FEAT_MULTI_LANG
6610     /* Check for a specified language */
6611     lang = check_help_lang(arg);
6612 #endif
6613 
6614     /* Go through all the directories in 'runtimepath' */
6615     p = p_rtp;
6616     while (*p != NUL && !got_int)
6617     {
6618 	copy_option_part(&p, NameBuff, MAXPATHL, ",");
6619 
6620 	hgr_search_files_in_dir(qi, NameBuff, p_regmatch
6621 #ifdef FEAT_MBYTE
6622 		, &vc
6623 #endif
6624 #ifdef FEAT_MULTI_LANG
6625 		, lang
6626 #endif
6627 		);
6628     }
6629 
6630 #ifdef FEAT_MBYTE
6631     if (vc.vc_type != CONV_NONE)
6632 	convert_setup(&vc, NULL, NULL);
6633 #endif
6634 }
6635 
6636 /*
6637  * ":helpgrep {pattern}"
6638  */
6639     void
6640 ex_helpgrep(exarg_T *eap)
6641 {
6642     regmatch_T	regmatch;
6643     char_u	*save_cpo;
6644     qf_info_T	*qi = &ql_info;
6645     int		new_qi = FALSE;
6646     char_u	*au_name =  NULL;
6647 
6648     switch (eap->cmdidx)
6649     {
6650 	case CMD_helpgrep:  au_name = (char_u *)"helpgrep"; break;
6651 	case CMD_lhelpgrep: au_name = (char_u *)"lhelpgrep"; break;
6652 	default: break;
6653     }
6654     if (au_name != NULL && apply_autocmds(EVENT_QUICKFIXCMDPRE, au_name,
6655 					       curbuf->b_fname, TRUE, curbuf))
6656     {
6657 #ifdef FEAT_EVAL
6658 	if (aborting())
6659 	    return;
6660 #endif
6661     }
6662 
6663     /* Make 'cpoptions' empty, the 'l' flag should not be used here. */
6664     save_cpo = p_cpo;
6665     p_cpo = empty_option;
6666 
6667     if (eap->cmdidx == CMD_lhelpgrep)
6668     {
6669 	qi = hgr_get_ll(&new_qi);
6670 	if (qi == NULL)
6671 	    return;
6672     }
6673 
6674     regmatch.regprog = vim_regcomp(eap->arg, RE_MAGIC + RE_STRING);
6675     regmatch.rm_ic = FALSE;
6676     if (regmatch.regprog != NULL)
6677     {
6678 	/* create a new quickfix list */
6679 	qf_new_list(qi, qf_cmdtitle(*eap->cmdlinep));
6680 
6681 	hgr_search_in_rtp(qi, &regmatch, eap->arg);
6682 
6683 	vim_regfree(regmatch.regprog);
6684 
6685 	qi->qf_lists[qi->qf_curlist].qf_nonevalid = FALSE;
6686 	qi->qf_lists[qi->qf_curlist].qf_ptr =
6687 	    qi->qf_lists[qi->qf_curlist].qf_start;
6688 	qi->qf_lists[qi->qf_curlist].qf_index = 1;
6689     }
6690 
6691     if (p_cpo == empty_option)
6692 	p_cpo = save_cpo;
6693     else
6694 	/* Darn, some plugin changed the value. */
6695 	free_string_option(save_cpo);
6696 
6697     qf_list_changed(qi, qi->qf_curlist);
6698     qf_update_buffer(qi, NULL);
6699 
6700     if (au_name != NULL)
6701     {
6702 	apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
6703 					       curbuf->b_fname, TRUE, curbuf);
6704 	if (!new_qi && qi != &ql_info && qf_find_buf(qi) == NULL)
6705 	    /* autocommands made "qi" invalid */
6706 	    return;
6707     }
6708 
6709     /* Jump to first match. */
6710     if (qi->qf_lists[qi->qf_curlist].qf_count > 0)
6711 	qf_jump(qi, 0, 0, FALSE);
6712     else
6713 	EMSG2(_(e_nomatch2), eap->arg);
6714 
6715     if (eap->cmdidx == CMD_lhelpgrep)
6716     {
6717 	/* If the help window is not opened or if it already points to the
6718 	 * correct location list, then free the new location list. */
6719 	if (!bt_help(curwin->w_buffer) || curwin->w_llist == qi)
6720 	{
6721 	    if (new_qi)
6722 		ll_free_all(&qi);
6723 	}
6724 	else if (curwin->w_llist == NULL)
6725 	    curwin->w_llist = qi;
6726     }
6727 }
6728 
6729 #endif /* FEAT_QUICKFIX */
6730