1 /*-
2 * Copyright 1986, Larry Wall
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following condition is met:
6 * 1. Redistributions of source code must retain the above copyright notice,
7 * this condition and the following disclaimer.
8 *
9 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
10 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
11 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
12 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
13 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
14 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
15 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
16 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
17 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
18 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
19 * SUCH DAMAGE.
20 *
21 * patch - a program to apply diffs to original files
22 *
23 * -C option added in 1998, original code by Marc Espie, based on FreeBSD
24 * behaviour
25 *
26 * $OpenBSD: pch.c,v 1.43 2014/11/18 17:03:35 tobias Exp $
27 * $FreeBSD$
28 */
29
30 #include <sys/types.h>
31 #include <sys/stat.h>
32
33 #include <ctype.h>
34 #include <libgen.h>
35 #include <limits.h>
36 #include <stdint.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41
42 #include "common.h"
43 #include "util.h"
44 #include "pch.h"
45 #include "pathnames.h"
46
47 /* Patch (diff listing) abstract type. */
48
49 static off_t p_filesize; /* size of the patch file */
50 static LINENUM p_first; /* 1st line number */
51 static LINENUM p_newfirst; /* 1st line number of replacement */
52 static LINENUM p_ptrn_lines; /* # lines in pattern */
53 static LINENUM p_repl_lines; /* # lines in replacement text */
54 static LINENUM p_end = -1; /* last line in hunk */
55 static LINENUM p_max; /* max allowed value of p_end */
56 static LINENUM p_context = 3; /* # of context lines */
57 static LINENUM p_input_line = 0; /* current line # from patch file */
58 static char **p_line = NULL;/* the text of the hunk */
59 static unsigned short *p_len = NULL; /* length of each line */
60 static char *p_char = NULL; /* +, -, and ! */
61 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */
62 static int p_indent; /* indent to patch */
63 static off_t p_base; /* where to intuit this time */
64 static LINENUM p_bline; /* line # of p_base */
65 static off_t p_start; /* where intuit found a patch */
66 static LINENUM p_sline; /* and the line number for it */
67 static LINENUM p_hunk_beg; /* line number of current hunk */
68 static LINENUM p_efake = -1; /* end of faked up lines--don't free */
69 static LINENUM p_bfake = -1; /* beg of faked up lines */
70 static FILE *pfp = NULL; /* patch file pointer */
71 static char *bestguess = NULL; /* guess at correct filename */
72
73 static void grow_hunkmax(void);
74 static int intuit_diff_type(void);
75 static void next_intuit_at(off_t, LINENUM);
76 static void skip_to(off_t, LINENUM);
77 static size_t pgets(bool _do_indent);
78 static char *best_name(const struct file_name *, bool);
79 static char *posix_name(const struct file_name *, bool);
80 static size_t num_components(const char *);
81 static LINENUM strtolinenum(char *, char **);
82
83 /*
84 * Prepare to look for the next patch in the patch file.
85 */
86 void
re_patch(void)87 re_patch(void)
88 {
89 p_first = 0;
90 p_newfirst = 0;
91 p_ptrn_lines = 0;
92 p_repl_lines = 0;
93 p_end = (LINENUM) - 1;
94 p_max = 0;
95 p_indent = 0;
96 }
97
98 /*
99 * Open the patch file at the beginning of time.
100 */
101 void
open_patch_file(const char * filename)102 open_patch_file(const char *filename)
103 {
104 struct stat filestat;
105 int nr, nw;
106
107 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) {
108 pfp = fopen(TMPPATNAME, "w");
109 if (pfp == NULL)
110 pfatal("can't create %s", TMPPATNAME);
111 while ((nr = fread(buf, 1, buf_size, stdin)) > 0) {
112 nw = fwrite(buf, 1, nr, pfp);
113 if (nr != nw)
114 pfatal("write error to %s", TMPPATNAME);
115 }
116 if (ferror(pfp) || fclose(pfp))
117 pfatal("can't write %s", TMPPATNAME);
118 filename = TMPPATNAME;
119 }
120 pfp = fopen(filename, "r");
121 if (pfp == NULL)
122 pfatal("patch file %s not found", filename);
123 if (fstat(fileno(pfp), &filestat))
124 pfatal("can't stat %s", filename);
125 p_filesize = filestat.st_size;
126 next_intuit_at(0, 1L); /* start at the beginning */
127 set_hunkmax();
128 }
129
130 /*
131 * Make sure our dynamically realloced tables are malloced to begin with.
132 */
133 void
set_hunkmax(void)134 set_hunkmax(void)
135 {
136 if (p_line == NULL)
137 p_line = malloc(hunkmax * sizeof(char *));
138 if (p_len == NULL)
139 p_len = malloc(hunkmax * sizeof(unsigned short));
140 if (p_char == NULL)
141 p_char = malloc(hunkmax * sizeof(char));
142 }
143
144 /*
145 * Enlarge the arrays containing the current hunk of patch.
146 */
147 static void
grow_hunkmax(void)148 grow_hunkmax(void)
149 {
150 int new_hunkmax = hunkmax * 2;
151
152 if (p_line == NULL || p_len == NULL || p_char == NULL)
153 fatal("Internal memory allocation error\n");
154
155 p_line = reallocf(p_line, new_hunkmax * sizeof(char *));
156 p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short));
157 p_char = reallocf(p_char, new_hunkmax * sizeof(char));
158
159 if (p_line != NULL && p_len != NULL && p_char != NULL) {
160 hunkmax = new_hunkmax;
161 return;
162 }
163
164 if (!using_plan_a)
165 fatal("out of memory\n");
166 out_of_mem = true; /* whatever is null will be allocated again */
167 /* from within plan_a(), of all places */
168 }
169
170 /* True if the remainder of the patch file contains a diff of some sort. */
171
172 bool
there_is_another_patch(void)173 there_is_another_patch(void)
174 {
175 bool exists = false;
176
177 if (p_base != 0 && p_base >= p_filesize) {
178 if (verbose)
179 say("done\n");
180 return false;
181 }
182 if (p_filesize == 0)
183 return false;
184 nonempty_patchf_seen = true;
185 if (verbose)
186 say("Hmm...");
187 diff_type = intuit_diff_type();
188 if (!diff_type) {
189 if (p_base != 0) {
190 if (verbose)
191 say(" Ignoring the trailing garbage.\ndone\n");
192 } else
193 say(" I can't seem to find a patch in there anywhere.\n");
194 return false;
195 }
196 if (verbose)
197 say(" %sooks like %s to me...\n",
198 (p_base == 0 ? "L" : "The next patch l"),
199 diff_type == UNI_DIFF ? "a unified diff" :
200 diff_type == CONTEXT_DIFF ? "a context diff" :
201 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" :
202 diff_type == NORMAL_DIFF ? "a normal diff" :
203 "an ed script");
204 if (p_indent && verbose)
205 say("(Patch is indented %d space%s.)\n", p_indent,
206 p_indent == 1 ? "" : "s");
207 skip_to(p_start, p_sline);
208 while (filearg[0] == NULL) {
209 if (force || batch) {
210 say("No file to patch. Skipping...\n");
211 filearg[0] = xstrdup(bestguess);
212 skip_rest_of_patch = true;
213 return true;
214 }
215 ask("File to patch: ");
216 if (*buf != '\n') {
217 free(bestguess);
218 bestguess = xstrdup(buf);
219 filearg[0] = fetchname(buf, &exists, 0);
220 }
221 if (!exists) {
222 int def_skip = *bestguess == '\0';
223 ask("No file found--skip this patch? [%c] ",
224 def_skip ? 'y' : 'n');
225 if (*buf == 'n' || (!def_skip && *buf != 'y'))
226 continue;
227 if (verbose)
228 say("Skipping patch...\n");
229 free(filearg[0]);
230 filearg[0] = fetchname(bestguess, &exists, 0);
231 skip_rest_of_patch = true;
232 return true;
233 }
234 }
235 return true;
236 }
237
238 static void
p4_fetchname(struct file_name * name,char * str)239 p4_fetchname(struct file_name *name, char *str)
240 {
241 char *t, *h;
242
243 /* Skip leading whitespace. */
244 while (isspace((unsigned char)*str))
245 str++;
246
247 /* Remove the file revision number. */
248 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++)
249 if (*t == '#')
250 h = t;
251 if (h != NULL)
252 *h = '\0';
253
254 name->path = fetchname(str, &name->exists, strippath);
255 }
256
257 /* Determine what kind of diff is in the remaining part of the patch file. */
258
259 static int
intuit_diff_type(void)260 intuit_diff_type(void)
261 {
262 off_t this_line = 0, previous_line;
263 off_t first_command_line = -1;
264 LINENUM fcl_line = -1;
265 bool last_line_was_command = false, this_is_a_command = false;
266 bool stars_last_line = false, stars_this_line = false;
267 char *s, *t;
268 int indent, retval;
269 struct file_name names[MAX_FILE];
270 int piece_of_git = 0;
271
272 memset(names, 0, sizeof(names));
273 ok_to_create_file = false;
274 fseeko(pfp, p_base, SEEK_SET);
275 p_input_line = p_bline - 1;
276 for (;;) {
277 previous_line = this_line;
278 last_line_was_command = this_is_a_command;
279 stars_last_line = stars_this_line;
280 this_line = ftello(pfp);
281 indent = 0;
282 p_input_line++;
283 if (pgets(false) == 0) {
284 if (first_command_line >= 0) {
285 /* nothing but deletes!? */
286 p_start = first_command_line;
287 p_sline = fcl_line;
288 retval = ED_DIFF;
289 goto scan_exit;
290 } else {
291 p_start = this_line;
292 p_sline = p_input_line;
293 retval = 0;
294 goto scan_exit;
295 }
296 }
297 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) {
298 if (*s == '\t')
299 indent += 8 - (indent % 8);
300 else
301 indent++;
302 }
303 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++)
304 ;
305 this_is_a_command = (isdigit((unsigned char)*s) &&
306 (*t == 'd' || *t == 'c' || *t == 'a'));
307 if (first_command_line < 0 && this_is_a_command) {
308 first_command_line = this_line;
309 fcl_line = p_input_line;
310 p_indent = indent; /* assume this for now */
311 }
312 if (!stars_last_line && strnEQ(s, "*** ", 4))
313 names[OLD_FILE].path = fetchname(s + 4,
314 &names[OLD_FILE].exists, strippath);
315 else if (strnEQ(s, "--- ", 4)) {
316 size_t off = 4;
317 if (piece_of_git && strippath == 957 &&
318 strnEQ(s, "--- a/", 6))
319 off = 6;
320 names[NEW_FILE].path = fetchname(s + off,
321 &names[NEW_FILE].exists, strippath);
322 } else if (strnEQ(s, "+++ ", 4)) {
323 /* pretend it is the old name */
324 size_t off = 4;
325 if (piece_of_git && strippath == 957 &&
326 strnEQ(s, "+++ b/", 6))
327 off = 6;
328 names[OLD_FILE].path = fetchname(s + off,
329 &names[OLD_FILE].exists, strippath);
330 } else if (strnEQ(s, "Index:", 6))
331 names[INDEX_FILE].path = fetchname(s + 6,
332 &names[INDEX_FILE].exists, strippath);
333 else if (strnEQ(s, "Prereq:", 7)) {
334 for (t = s + 7; isspace((unsigned char)*t); t++)
335 ;
336 revision = xstrdup(t);
337 for (t = revision;
338 *t && !isspace((unsigned char)*t); t++)
339 ;
340 *t = '\0';
341 if (*revision == '\0') {
342 free(revision);
343 revision = NULL;
344 }
345 } else if (strnEQ(s, "diff --git a/", 13)) {
346 /* Git-style diffs. */
347 piece_of_git = 1;
348 } else if (strnEQ(s, "==== ", 5)) {
349 /* Perforce-style diffs. */
350 if ((t = strstr(s + 5, " - ")) != NULL)
351 p4_fetchname(&names[NEW_FILE], t + 3);
352 p4_fetchname(&names[OLD_FILE], s + 5);
353 }
354 if ((!diff_type || diff_type == ED_DIFF) &&
355 first_command_line >= 0 &&
356 strEQ(s, ".\n")) {
357 p_indent = indent;
358 p_start = first_command_line;
359 p_sline = fcl_line;
360 retval = ED_DIFF;
361 goto scan_exit;
362 }
363 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) {
364 if (strnEQ(s + 4, "0,0", 3))
365 ok_to_create_file = true;
366 p_indent = indent;
367 p_start = this_line;
368 p_sline = p_input_line;
369 retval = UNI_DIFF;
370 goto scan_exit;
371 }
372 stars_this_line = strnEQ(s, "********", 8);
373 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line &&
374 strnEQ(s, "*** ", 4)) {
375 if (strtolinenum(s + 4, &s) == 0)
376 ok_to_create_file = true;
377 /*
378 * If this is a new context diff the character just
379 * at the end of the line is a '*'.
380 */
381 while (*s && *s != '\n')
382 s++;
383 p_indent = indent;
384 p_start = previous_line;
385 p_sline = p_input_line - 1;
386 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF);
387 goto scan_exit;
388 }
389 if ((!diff_type || diff_type == NORMAL_DIFF) &&
390 last_line_was_command &&
391 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) {
392 p_start = previous_line;
393 p_sline = p_input_line - 1;
394 p_indent = indent;
395 retval = NORMAL_DIFF;
396 goto scan_exit;
397 }
398 }
399 scan_exit:
400 if (retval == UNI_DIFF) {
401 /* unswap old and new */
402 struct file_name tmp = names[OLD_FILE];
403 names[OLD_FILE] = names[NEW_FILE];
404 names[NEW_FILE] = tmp;
405 }
406 if (filearg[0] == NULL) {
407 if (posix)
408 filearg[0] = posix_name(names, ok_to_create_file);
409 else {
410 /* Ignore the Index: name for context diffs, like GNU */
411 if (names[OLD_FILE].path != NULL ||
412 names[NEW_FILE].path != NULL) {
413 free(names[INDEX_FILE].path);
414 names[INDEX_FILE].path = NULL;
415 }
416 filearg[0] = best_name(names, ok_to_create_file);
417 }
418 }
419
420 free(bestguess);
421 bestguess = NULL;
422 if (filearg[0] != NULL)
423 bestguess = xstrdup(filearg[0]);
424 else if (!ok_to_create_file) {
425 /*
426 * We don't want to create a new file but we need a
427 * filename to set bestguess. Avoid setting filearg[0]
428 * so the file is not created automatically.
429 */
430 if (posix)
431 bestguess = posix_name(names, true);
432 else
433 bestguess = best_name(names, true);
434 }
435 free(names[OLD_FILE].path);
436 free(names[NEW_FILE].path);
437 free(names[INDEX_FILE].path);
438 return retval;
439 }
440
441 /*
442 * Remember where this patch ends so we know where to start up again.
443 */
444 static void
next_intuit_at(off_t file_pos,LINENUM file_line)445 next_intuit_at(off_t file_pos, LINENUM file_line)
446 {
447 p_base = file_pos;
448 p_bline = file_line;
449 }
450
451 /*
452 * Basically a verbose fseeko() to the actual diff listing.
453 */
454 static void
skip_to(off_t file_pos,LINENUM file_line)455 skip_to(off_t file_pos, LINENUM file_line)
456 {
457 size_t len;
458
459 if (p_base > file_pos)
460 fatal("Internal error: seek %lld>%lld\n",
461 (long long)p_base, (long long)file_pos);
462 if (verbose && p_base < file_pos) {
463 fseeko(pfp, p_base, SEEK_SET);
464 say("The text leading up to this was:\n--------------------------\n");
465 while (ftello(pfp) < file_pos) {
466 len = pgets(false);
467 if (len == 0)
468 fatal("Unexpected end of file\n");
469 say("|%s", buf);
470 }
471 say("--------------------------\n");
472 } else
473 fseeko(pfp, file_pos, SEEK_SET);
474 p_input_line = file_line - 1;
475 }
476
477 /* Make this a function for better debugging. */
478 static void
malformed(void)479 malformed(void)
480 {
481 fatal("malformed patch at line %ld: %s", p_input_line, buf);
482 /* about as informative as "Syntax error" in C */
483 }
484
485 /*
486 * True if the line has been discarded (i.e. it is a line saying
487 * "\ No newline at end of file".)
488 */
489 static bool
remove_special_line(void)490 remove_special_line(void)
491 {
492 int c;
493
494 c = fgetc(pfp);
495 if (c == '\\') {
496 do {
497 c = fgetc(pfp);
498 } while (c != EOF && c != '\n');
499
500 return true;
501 }
502 if (c != EOF)
503 fseeko(pfp, -1, SEEK_CUR);
504
505 return false;
506 }
507
508 /*
509 * True if there is more of the current diff listing to process.
510 */
511 bool
another_hunk(void)512 another_hunk(void)
513 {
514 off_t line_beginning; /* file pos of the current line */
515 LINENUM repl_beginning; /* index of --- line */
516 LINENUM fillcnt; /* #lines of missing ptrn or repl */
517 LINENUM fillsrc; /* index of first line to copy */
518 LINENUM filldst; /* index of first missing line */
519 bool ptrn_spaces_eaten; /* ptrn was slightly malformed */
520 bool repl_could_be_missing; /* no + or ! lines in this hunk */
521 bool repl_missing; /* we are now backtracking */
522 off_t repl_backtrack_position; /* file pos of first repl line */
523 LINENUM repl_patch_line; /* input line number for same */
524 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */
525 char *s;
526 size_t len;
527 int context = 0;
528
529 while (p_end >= 0) {
530 if (p_end == p_efake)
531 p_end = p_bfake; /* don't free twice */
532 else
533 free(p_line[p_end]);
534 p_end--;
535 }
536 p_efake = -1;
537
538 p_max = hunkmax; /* gets reduced when --- found */
539 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) {
540 line_beginning = ftello(pfp);
541 repl_beginning = 0;
542 fillcnt = 0;
543 fillsrc = 0;
544 filldst = 0;
545 ptrn_spaces_eaten = false;
546 repl_could_be_missing = true;
547 repl_missing = false;
548 repl_backtrack_position = 0;
549 repl_patch_line = 0;
550 ptrn_copiable = 0;
551
552 len = pgets(true);
553 p_input_line++;
554 if (len == 0 || strnNE(buf, "********", 8)) {
555 next_intuit_at(line_beginning, p_input_line);
556 return false;
557 }
558 p_context = 100;
559 p_hunk_beg = p_input_line + 1;
560 while (p_end < p_max) {
561 line_beginning = ftello(pfp);
562 len = pgets(true);
563 p_input_line++;
564 if (len == 0) {
565 if (p_max - p_end < 4) {
566 /* assume blank lines got chopped */
567 strlcpy(buf, " \n", buf_size);
568 } else {
569 if (repl_beginning && repl_could_be_missing) {
570 repl_missing = true;
571 goto hunk_done;
572 }
573 fatal("unexpected end of file in patch\n");
574 }
575 }
576 p_end++;
577 if (p_end >= hunkmax)
578 fatal("Internal error: hunk larger than hunk "
579 "buffer size");
580 p_char[p_end] = *buf;
581 p_line[p_end] = NULL;
582 switch (*buf) {
583 case '*':
584 if (strnEQ(buf, "********", 8)) {
585 if (repl_beginning && repl_could_be_missing) {
586 repl_missing = true;
587 goto hunk_done;
588 } else
589 fatal("unexpected end of hunk "
590 "at line %ld\n",
591 p_input_line);
592 }
593 if (p_end != 0) {
594 if (repl_beginning && repl_could_be_missing) {
595 repl_missing = true;
596 goto hunk_done;
597 }
598 fatal("unexpected *** at line %ld: %s",
599 p_input_line, buf);
600 }
601 context = 0;
602 p_line[p_end] = savestr(buf);
603 if (out_of_mem) {
604 p_end--;
605 return false;
606 }
607 for (s = buf;
608 *s && !isdigit((unsigned char)*s); s++)
609 ;
610 if (!*s)
611 malformed();
612 if (strnEQ(s, "0,0", 3))
613 memmove(s, s + 2, strlen(s + 2) + 1);
614 p_first = strtolinenum(s, &s);
615 if (*s == ',') {
616 for (;
617 *s && !isdigit((unsigned char)*s); s++)
618 ;
619 if (!*s)
620 malformed();
621 p_ptrn_lines = strtolinenum(s, &s) - p_first + 1;
622 if (p_ptrn_lines < 0)
623 malformed();
624 } else if (p_first)
625 p_ptrn_lines = 1;
626 else {
627 p_ptrn_lines = 0;
628 p_first = 1;
629 }
630 if (p_first >= LINENUM_MAX - p_ptrn_lines ||
631 p_ptrn_lines >= LINENUM_MAX - 6)
632 malformed();
633
634 /* we need this much at least */
635 p_max = p_ptrn_lines + 6;
636 while (p_max >= hunkmax)
637 grow_hunkmax();
638 p_max = hunkmax;
639 break;
640 case '-':
641 if (buf[1] == '-') {
642 if (repl_beginning ||
643 (p_end != p_ptrn_lines + 1 +
644 (p_char[p_end - 1] == '\n'))) {
645 if (p_end == 1) {
646 /*
647 * `old' lines were omitted;
648 * set up to fill them in
649 * from 'new' context lines.
650 */
651 p_end = p_ptrn_lines + 1;
652 fillsrc = p_end + 1;
653 filldst = 1;
654 fillcnt = p_ptrn_lines;
655 } else {
656 if (repl_beginning) {
657 if (repl_could_be_missing) {
658 repl_missing = true;
659 goto hunk_done;
660 }
661 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n",
662 p_input_line, p_hunk_beg + repl_beginning);
663 } else {
664 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n",
665 (p_end <= p_ptrn_lines
666 ? "Premature"
667 : "Overdue"),
668 p_input_line, p_hunk_beg);
669 }
670 }
671 }
672 repl_beginning = p_end;
673 repl_backtrack_position = ftello(pfp);
674 repl_patch_line = p_input_line;
675 p_line[p_end] = savestr(buf);
676 if (out_of_mem) {
677 p_end--;
678 return false;
679 }
680 p_char[p_end] = '=';
681 for (s = buf; *s && !isdigit((unsigned char)*s); s++)
682 ;
683 if (!*s)
684 malformed();
685 p_newfirst = strtolinenum(s, &s);
686 if (*s == ',') {
687 for (; *s && !isdigit((unsigned char)*s); s++)
688 ;
689 if (!*s)
690 malformed();
691 p_repl_lines = strtolinenum(s, &s) -
692 p_newfirst + 1;
693 if (p_repl_lines < 0)
694 malformed();
695 } else if (p_newfirst)
696 p_repl_lines = 1;
697 else {
698 p_repl_lines = 0;
699 p_newfirst = 1;
700 }
701 if (p_newfirst >= LINENUM_MAX - p_repl_lines ||
702 p_repl_lines >= LINENUM_MAX - p_end)
703 malformed();
704 p_max = p_repl_lines + p_end;
705 if (p_max > MAXHUNKSIZE)
706 fatal("hunk too large (%ld lines) at line %ld: %s",
707 p_max, p_input_line, buf);
708 while (p_max >= hunkmax)
709 grow_hunkmax();
710 if (p_repl_lines != ptrn_copiable &&
711 (p_context != 0 || p_repl_lines != 1))
712 repl_could_be_missing = false;
713 break;
714 }
715 goto change_line;
716 case '+':
717 case '!':
718 repl_could_be_missing = false;
719 change_line:
720 if (buf[1] == '\n' && canonicalize)
721 strlcpy(buf + 1, " \n", buf_size - 1);
722 if (!isspace((unsigned char)buf[1]) &&
723 buf[1] != '>' && buf[1] != '<' &&
724 repl_beginning && repl_could_be_missing) {
725 repl_missing = true;
726 goto hunk_done;
727 }
728 if (context >= 0) {
729 if (context < p_context)
730 p_context = context;
731 context = -1000;
732 }
733 p_line[p_end] = savestr(buf + 2);
734 if (out_of_mem) {
735 p_end--;
736 return false;
737 }
738 if (p_end == p_ptrn_lines) {
739 if (remove_special_line()) {
740 int l;
741
742 l = strlen(p_line[p_end]) - 1;
743 (p_line[p_end])[l] = 0;
744 }
745 }
746 break;
747 case '\t':
748 case '\n': /* assume the 2 spaces got eaten */
749 if (repl_beginning && repl_could_be_missing &&
750 (!ptrn_spaces_eaten ||
751 diff_type == NEW_CONTEXT_DIFF)) {
752 repl_missing = true;
753 goto hunk_done;
754 }
755 p_line[p_end] = savestr(buf);
756 if (out_of_mem) {
757 p_end--;
758 return false;
759 }
760 if (p_end != p_ptrn_lines + 1) {
761 ptrn_spaces_eaten |= (repl_beginning != 0);
762 context++;
763 if (!repl_beginning)
764 ptrn_copiable++;
765 p_char[p_end] = ' ';
766 }
767 break;
768 case ' ':
769 if (!isspace((unsigned char)buf[1]) &&
770 repl_beginning && repl_could_be_missing) {
771 repl_missing = true;
772 goto hunk_done;
773 }
774 context++;
775 if (!repl_beginning)
776 ptrn_copiable++;
777 p_line[p_end] = savestr(buf + 2);
778 if (out_of_mem) {
779 p_end--;
780 return false;
781 }
782 break;
783 default:
784 if (repl_beginning && repl_could_be_missing) {
785 repl_missing = true;
786 goto hunk_done;
787 }
788 malformed();
789 }
790 /* set up p_len for strncmp() so we don't have to */
791 /* assume null termination */
792 if (p_line[p_end])
793 p_len[p_end] = strlen(p_line[p_end]);
794 else
795 p_len[p_end] = 0;
796 }
797
798 hunk_done:
799 if (p_end >= 0 && !repl_beginning)
800 fatal("no --- found in patch at line %ld\n", pch_hunk_beg());
801
802 if (repl_missing) {
803
804 /* reset state back to just after --- */
805 p_input_line = repl_patch_line;
806 for (p_end--; p_end > repl_beginning; p_end--)
807 free(p_line[p_end]);
808 fseeko(pfp, repl_backtrack_position, SEEK_SET);
809
810 /* redundant 'new' context lines were omitted - set */
811 /* up to fill them in from the old file context */
812 if (!p_context && p_repl_lines == 1) {
813 p_repl_lines = 0;
814 p_max--;
815 }
816 fillsrc = 1;
817 filldst = repl_beginning + 1;
818 fillcnt = p_repl_lines;
819 p_end = p_max;
820 } else if (!p_context && fillcnt == 1) {
821 /* the first hunk was a null hunk with no context */
822 /* and we were expecting one line -- fix it up. */
823 while (filldst < p_end) {
824 p_line[filldst] = p_line[filldst + 1];
825 p_char[filldst] = p_char[filldst + 1];
826 p_len[filldst] = p_len[filldst + 1];
827 filldst++;
828 }
829 #if 0
830 repl_beginning--; /* this doesn't need to be fixed */
831 #endif
832 p_end--;
833 p_first++; /* do append rather than insert */
834 fillcnt = 0;
835 p_ptrn_lines = 0;
836 }
837 if (diff_type == CONTEXT_DIFF &&
838 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) {
839 if (verbose)
840 say("%s\n%s\n%s\n",
841 "(Fascinating--this is really a new-style context diff but without",
842 "the telltale extra asterisks on the *** line that usually indicate",
843 "the new style...)");
844 diff_type = NEW_CONTEXT_DIFF;
845 }
846 /* if there were omitted context lines, fill them in now */
847 if (fillcnt) {
848 p_bfake = filldst; /* remember where not to free() */
849 p_efake = filldst + fillcnt - 1;
850 while (fillcnt-- > 0) {
851 while (fillsrc <= p_end && p_char[fillsrc] != ' ')
852 fillsrc++;
853 if (fillsrc > p_end)
854 fatal("replacement text or line numbers mangled in hunk at line %ld\n",
855 p_hunk_beg);
856 p_line[filldst] = p_line[fillsrc];
857 p_char[filldst] = p_char[fillsrc];
858 p_len[filldst] = p_len[fillsrc];
859 fillsrc++;
860 filldst++;
861 }
862 while (fillsrc <= p_end && fillsrc != repl_beginning &&
863 p_char[fillsrc] != ' ')
864 fillsrc++;
865 #ifdef DEBUGGING
866 if (debug & 64)
867 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n",
868 fillsrc, filldst, repl_beginning, p_end + 1);
869 #endif
870 if (fillsrc != p_end + 1 && fillsrc != repl_beginning)
871 malformed();
872 if (filldst != p_end + 1 && filldst != repl_beginning)
873 malformed();
874 }
875 if (p_line[p_end] != NULL) {
876 if (remove_special_line()) {
877 p_len[p_end] -= 1;
878 (p_line[p_end])[p_len[p_end]] = 0;
879 }
880 }
881 } else if (diff_type == UNI_DIFF) {
882 LINENUM fillold; /* index of old lines */
883 LINENUM fillnew; /* index of new lines */
884 char ch;
885
886 line_beginning = ftello(pfp); /* file pos of the current line */
887 len = pgets(true);
888 p_input_line++;
889 if (len == 0 || strnNE(buf, "@@ -", 4)) {
890 next_intuit_at(line_beginning, p_input_line);
891 return false;
892 }
893 s = buf + 4;
894 if (!*s)
895 malformed();
896 p_first = strtolinenum(s, &s);
897 if (*s == ',') {
898 p_ptrn_lines = strtolinenum(s + 1, &s);
899 } else
900 p_ptrn_lines = 1;
901 if (*s == ' ')
902 s++;
903 if (*s != '+' || !*++s)
904 malformed();
905 p_newfirst = strtolinenum(s, &s);
906 if (*s == ',') {
907 p_repl_lines = strtolinenum(s + 1, &s);
908 } else
909 p_repl_lines = 1;
910 if (*s == ' ')
911 s++;
912 if (*s != '@')
913 malformed();
914 if (p_first >= LINENUM_MAX - p_ptrn_lines ||
915 p_newfirst > LINENUM_MAX - p_repl_lines ||
916 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1)
917 malformed();
918 if (!p_ptrn_lines)
919 p_first++; /* do append rather than insert */
920 p_max = p_ptrn_lines + p_repl_lines + 1;
921 while (p_max >= hunkmax)
922 grow_hunkmax();
923 fillold = 1;
924 fillnew = fillold + p_ptrn_lines;
925 p_end = fillnew + p_repl_lines;
926 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first,
927 p_first + p_ptrn_lines - 1);
928 p_line[0] = savestr(buf);
929 if (out_of_mem) {
930 p_end = -1;
931 return false;
932 }
933 p_char[0] = '*';
934 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst,
935 p_newfirst + p_repl_lines - 1);
936 p_line[fillnew] = savestr(buf);
937 if (out_of_mem) {
938 p_end = 0;
939 return false;
940 }
941 p_char[fillnew++] = '=';
942 p_context = 100;
943 context = 0;
944 p_hunk_beg = p_input_line + 1;
945 while (fillold <= p_ptrn_lines || fillnew <= p_end) {
946 line_beginning = ftello(pfp);
947 len = pgets(true);
948 p_input_line++;
949 if (len == 0) {
950 if (p_max - fillnew < 3) {
951 /* assume blank lines got chopped */
952 strlcpy(buf, " \n", buf_size);
953 } else {
954 fatal("unexpected end of file in patch\n");
955 }
956 }
957 if (*buf == '\t' || *buf == '\n') {
958 ch = ' '; /* assume the space got eaten */
959 s = savestr(buf);
960 } else {
961 ch = *buf;
962 s = savestr(buf + 1);
963 }
964 if (out_of_mem) {
965 while (--fillnew > p_ptrn_lines)
966 free(p_line[fillnew]);
967 p_end = fillold - 1;
968 return false;
969 }
970 switch (ch) {
971 case '-':
972 if (fillold > p_ptrn_lines) {
973 free(s);
974 p_end = fillnew - 1;
975 malformed();
976 }
977 p_char[fillold] = ch;
978 p_line[fillold] = s;
979 p_len[fillold++] = strlen(s);
980 if (fillold > p_ptrn_lines) {
981 if (remove_special_line()) {
982 p_len[fillold - 1] -= 1;
983 s[p_len[fillold - 1]] = 0;
984 }
985 }
986 break;
987 case '=':
988 ch = ' ';
989 /* FALL THROUGH */
990 case ' ':
991 if (fillold > p_ptrn_lines) {
992 free(s);
993 while (--fillnew > p_ptrn_lines)
994 free(p_line[fillnew]);
995 p_end = fillold - 1;
996 malformed();
997 }
998 context++;
999 p_char[fillold] = ch;
1000 p_line[fillold] = s;
1001 p_len[fillold++] = strlen(s);
1002 s = savestr(s);
1003 if (out_of_mem) {
1004 while (--fillnew > p_ptrn_lines)
1005 free(p_line[fillnew]);
1006 p_end = fillold - 1;
1007 return false;
1008 }
1009 if (fillold > p_ptrn_lines) {
1010 if (remove_special_line()) {
1011 p_len[fillold - 1] -= 1;
1012 s[p_len[fillold - 1]] = 0;
1013 }
1014 }
1015 /* FALL THROUGH */
1016 case '+':
1017 if (fillnew > p_end) {
1018 free(s);
1019 while (--fillnew > p_ptrn_lines)
1020 free(p_line[fillnew]);
1021 p_end = fillold - 1;
1022 malformed();
1023 }
1024 p_char[fillnew] = ch;
1025 p_line[fillnew] = s;
1026 p_len[fillnew++] = strlen(s);
1027 if (fillold > p_ptrn_lines) {
1028 if (remove_special_line()) {
1029 p_len[fillnew - 1] -= 1;
1030 s[p_len[fillnew - 1]] = 0;
1031 }
1032 }
1033 break;
1034 default:
1035 p_end = fillnew;
1036 malformed();
1037 }
1038 if (ch != ' ' && context > 0) {
1039 if (context < p_context)
1040 p_context = context;
1041 context = -1000;
1042 }
1043 } /* while */
1044 } else { /* normal diff--fake it up */
1045 char hunk_type;
1046 int i;
1047 LINENUM min, max;
1048
1049 line_beginning = ftello(pfp);
1050 p_context = 0;
1051 len = pgets(true);
1052 p_input_line++;
1053 if (len == 0 || !isdigit((unsigned char)*buf)) {
1054 next_intuit_at(line_beginning, p_input_line);
1055 return false;
1056 }
1057 p_first = strtolinenum(buf, &s);
1058 if (*s == ',') {
1059 p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1;
1060 if (p_ptrn_lines < 0)
1061 malformed();
1062 } else
1063 p_ptrn_lines = (*s != 'a');
1064 hunk_type = *s;
1065 if (hunk_type == 'a')
1066 p_first++; /* do append rather than insert */
1067 min = strtolinenum(s + 1, &s);
1068 if (*s == ',')
1069 max = strtolinenum(s + 1, &s);
1070 else
1071 max = min;
1072 if (min < 0 || min > max || max - min == LINENUM_MAX)
1073 malformed();
1074 if (hunk_type == 'd')
1075 min++;
1076 p_newfirst = min;
1077 p_repl_lines = max - min + 1;
1078 if (p_newfirst > LINENUM_MAX - p_repl_lines ||
1079 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1)
1080 malformed();
1081 p_end = p_ptrn_lines + p_repl_lines + 1;
1082 if (p_end > MAXHUNKSIZE)
1083 fatal("hunk too large (%ld lines) at line %ld: %s",
1084 p_end, p_input_line, buf);
1085 while (p_end >= hunkmax)
1086 grow_hunkmax();
1087 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first,
1088 p_first + p_ptrn_lines - 1);
1089 p_line[0] = savestr(buf);
1090 if (out_of_mem) {
1091 p_end = -1;
1092 return false;
1093 }
1094 p_char[0] = '*';
1095 for (i = 1; i <= p_ptrn_lines; i++) {
1096 len = pgets(true);
1097 p_input_line++;
1098 if (len == 0)
1099 fatal("unexpected end of file in patch at line %ld\n",
1100 p_input_line);
1101 if (*buf != '<')
1102 fatal("< expected at line %ld of patch\n",
1103 p_input_line);
1104 p_line[i] = savestr(buf + 2);
1105 if (out_of_mem) {
1106 p_end = i - 1;
1107 return false;
1108 }
1109 p_len[i] = strlen(p_line[i]);
1110 p_char[i] = '-';
1111 }
1112
1113 if (remove_special_line()) {
1114 p_len[i - 1] -= 1;
1115 (p_line[i - 1])[p_len[i - 1]] = 0;
1116 }
1117 if (hunk_type == 'c') {
1118 len = pgets(true);
1119 p_input_line++;
1120 if (len == 0)
1121 fatal("unexpected end of file in patch at line %ld\n",
1122 p_input_line);
1123 if (*buf != '-')
1124 fatal("--- expected at line %ld of patch\n",
1125 p_input_line);
1126 }
1127 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max);
1128 p_line[i] = savestr(buf);
1129 if (out_of_mem) {
1130 p_end = i - 1;
1131 return false;
1132 }
1133 p_char[i] = '=';
1134 for (i++; i <= p_end; i++) {
1135 len = pgets(true);
1136 p_input_line++;
1137 if (len == 0)
1138 fatal("unexpected end of file in patch at line %ld\n",
1139 p_input_line);
1140 if (*buf != '>')
1141 fatal("> expected at line %ld of patch\n",
1142 p_input_line);
1143 /* Don't overrun if we don't have enough line */
1144 if (len > 2)
1145 p_line[i] = savestr(buf + 2);
1146 else
1147 p_line[i] = savestr("");
1148
1149 if (out_of_mem) {
1150 p_end = i - 1;
1151 return false;
1152 }
1153 p_len[i] = strlen(p_line[i]);
1154 p_char[i] = '+';
1155 }
1156
1157 if (remove_special_line()) {
1158 p_len[i - 1] -= 1;
1159 (p_line[i - 1])[p_len[i - 1]] = 0;
1160 }
1161 }
1162 if (reverse) /* backwards patch? */
1163 if (!pch_swap())
1164 say("Not enough memory to swap next hunk!\n");
1165 #ifdef DEBUGGING
1166 if (debug & 2) {
1167 LINENUM i;
1168 char special;
1169
1170 for (i = 0; i <= p_end; i++) {
1171 if (i == p_ptrn_lines)
1172 special = '^';
1173 else
1174 special = ' ';
1175 fprintf(stderr, "%3ld %c %c %s", i, p_char[i],
1176 special, p_line[i]);
1177 fflush(stderr);
1178 }
1179 }
1180 #endif
1181 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */
1182 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */
1183 return true;
1184 }
1185
1186 /*
1187 * Input a line from the patch file.
1188 * Worry about indentation if do_indent is true.
1189 * The line is read directly into the buf global variable which
1190 * is resized if necessary in order to hold the complete line.
1191 * Returns the number of characters read including the terminating
1192 * '\n', if any.
1193 */
1194 size_t
pgets(bool do_indent)1195 pgets(bool do_indent)
1196 {
1197 char *line;
1198 size_t len;
1199 int indent = 0, skipped = 0;
1200
1201 line = fgetln(pfp, &len);
1202 if (line != NULL) {
1203 if (len + 1 > buf_size) {
1204 while (len + 1 > buf_size)
1205 buf_size *= 2;
1206 free(buf);
1207 buf = malloc(buf_size);
1208 if (buf == NULL)
1209 fatal("out of memory\n");
1210 }
1211 if (do_indent == 1 && p_indent) {
1212 for (;
1213 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X');
1214 line++, skipped++) {
1215 if (*line == '\t')
1216 indent += 8 - (indent %7);
1217 else
1218 indent++;
1219 }
1220 }
1221 memcpy(buf, line, len - skipped);
1222 buf[len - skipped] = '\0';
1223 }
1224 return len;
1225 }
1226
1227
1228 /*
1229 * Reverse the old and new portions of the current hunk.
1230 */
1231 bool
pch_swap(void)1232 pch_swap(void)
1233 {
1234 char **tp_line; /* the text of the hunk */
1235 unsigned short *tp_len;/* length of each line */
1236 char *tp_char; /* +, -, and ! */
1237 LINENUM i;
1238 LINENUM n;
1239 bool blankline = false;
1240 char *s;
1241
1242 i = p_first;
1243 p_first = p_newfirst;
1244 p_newfirst = i;
1245
1246 /* make a scratch copy */
1247
1248 tp_line = p_line;
1249 tp_len = p_len;
1250 tp_char = p_char;
1251 p_line = NULL; /* force set_hunkmax to allocate again */
1252 p_len = NULL;
1253 p_char = NULL;
1254 set_hunkmax();
1255 if (p_line == NULL || p_len == NULL || p_char == NULL) {
1256
1257 free(p_line);
1258 p_line = tp_line;
1259 free(p_len);
1260 p_len = tp_len;
1261 free(p_char);
1262 p_char = tp_char;
1263 return false; /* not enough memory to swap hunk! */
1264 }
1265 /* now turn the new into the old */
1266
1267 i = p_ptrn_lines + 1;
1268 if (tp_char[i] == '\n') { /* account for possible blank line */
1269 blankline = true;
1270 i++;
1271 }
1272 if (p_efake >= 0) { /* fix non-freeable ptr range */
1273 if (p_efake <= i)
1274 n = p_end - i + 1;
1275 else
1276 n = -i;
1277 p_efake += n;
1278 p_bfake += n;
1279 }
1280 for (n = 0; i <= p_end; i++, n++) {
1281 p_line[n] = tp_line[i];
1282 p_char[n] = tp_char[i];
1283 if (p_char[n] == '+')
1284 p_char[n] = '-';
1285 p_len[n] = tp_len[i];
1286 }
1287 if (blankline) {
1288 i = p_ptrn_lines + 1;
1289 p_line[n] = tp_line[i];
1290 p_char[n] = tp_char[i];
1291 p_len[n] = tp_len[i];
1292 n++;
1293 }
1294 if (p_char[0] != '=')
1295 fatal("Malformed patch at line %ld: expected '=' found '%c'\n",
1296 p_input_line, p_char[0]);
1297 p_char[0] = '*';
1298 for (s = p_line[0]; *s; s++)
1299 if (*s == '-')
1300 *s = '*';
1301
1302 /* now turn the old into the new */
1303
1304 if (p_char[0] != '*')
1305 fatal("Malformed patch at line %ld: expected '*' found '%c'\n",
1306 p_input_line, p_char[0]);
1307 tp_char[0] = '=';
1308 for (s = tp_line[0]; *s; s++)
1309 if (*s == '*')
1310 *s = '-';
1311 for (i = 0; n <= p_end; i++, n++) {
1312 p_line[n] = tp_line[i];
1313 p_char[n] = tp_char[i];
1314 if (p_char[n] == '-')
1315 p_char[n] = '+';
1316 p_len[n] = tp_len[i];
1317 }
1318
1319 if (i != p_ptrn_lines + 1)
1320 fatal("Malformed patch at line %ld: expected %ld lines, "
1321 "got %ld\n",
1322 p_input_line, p_ptrn_lines + 1, i);
1323
1324 i = p_ptrn_lines;
1325 p_ptrn_lines = p_repl_lines;
1326 p_repl_lines = i;
1327
1328 free(tp_line);
1329 free(tp_len);
1330 free(tp_char);
1331
1332 return true;
1333 }
1334
1335 /*
1336 * Return the specified line position in the old file of the old context.
1337 */
1338 LINENUM
pch_first(void)1339 pch_first(void)
1340 {
1341 return p_first;
1342 }
1343
1344 /*
1345 * Return the number of lines of old context.
1346 */
1347 LINENUM
pch_ptrn_lines(void)1348 pch_ptrn_lines(void)
1349 {
1350 return p_ptrn_lines;
1351 }
1352
1353 /*
1354 * Return the probable line position in the new file of the first line.
1355 */
1356 LINENUM
pch_newfirst(void)1357 pch_newfirst(void)
1358 {
1359 return p_newfirst;
1360 }
1361
1362 /*
1363 * Return the number of lines in the replacement text including context.
1364 */
1365 LINENUM
pch_repl_lines(void)1366 pch_repl_lines(void)
1367 {
1368 return p_repl_lines;
1369 }
1370
1371 /*
1372 * Return the number of lines in the whole hunk.
1373 */
1374 LINENUM
pch_end(void)1375 pch_end(void)
1376 {
1377 return p_end;
1378 }
1379
1380 /*
1381 * Return the number of context lines before the first changed line.
1382 */
1383 LINENUM
pch_context(void)1384 pch_context(void)
1385 {
1386 return p_context;
1387 }
1388
1389 /*
1390 * Return the length of a particular patch line.
1391 */
1392 unsigned short
pch_line_len(LINENUM line)1393 pch_line_len(LINENUM line)
1394 {
1395 return p_len[line];
1396 }
1397
1398 /*
1399 * Return the control character (+, -, *, !, etc) for a patch line.
1400 */
1401 char
pch_char(LINENUM line)1402 pch_char(LINENUM line)
1403 {
1404 return p_char[line];
1405 }
1406
1407 /*
1408 * Return a pointer to a particular patch line.
1409 */
1410 char *
pfetch(LINENUM line)1411 pfetch(LINENUM line)
1412 {
1413 return p_line[line];
1414 }
1415
1416 /*
1417 * Return where in the patch file this hunk began, for error messages.
1418 */
1419 LINENUM
pch_hunk_beg(void)1420 pch_hunk_beg(void)
1421 {
1422 return p_hunk_beg;
1423 }
1424
1425 /*
1426 * Apply an ed script by feeding ed itself.
1427 */
1428 void
do_ed_script(void)1429 do_ed_script(void)
1430 {
1431 char *t;
1432 off_t beginning_of_this_line;
1433 FILE *pipefp = NULL;
1434 int continuation;
1435
1436 if (!skip_rest_of_patch) {
1437 if (copy_file(filearg[0], TMPOUTNAME) < 0) {
1438 unlink(TMPOUTNAME);
1439 fatal("can't create temp file %s", TMPOUTNAME);
1440 }
1441 snprintf(buf, buf_size, "%s%s%s", _PATH_RED,
1442 verbose ? " " : " -s ", TMPOUTNAME);
1443 pipefp = popen(buf, "w");
1444 }
1445 for (;;) {
1446 beginning_of_this_line = ftello(pfp);
1447 if (pgets(true) == 0) {
1448 next_intuit_at(beginning_of_this_line, p_input_line);
1449 break;
1450 }
1451 p_input_line++;
1452 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++)
1453 ;
1454 /* POSIX defines allowed commands as {a,c,d,i,s} */
1455 if (isdigit((unsigned char)*buf) &&
1456 (*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) {
1457 if (pipefp != NULL)
1458 fputs(buf, pipefp);
1459 if (*t == 's') {
1460 for (;;) {
1461 continuation = 0;
1462 t = strchr(buf, '\0') - 1;
1463 while (--t >= buf && *t == '\\')
1464 continuation = !continuation;
1465 if (!continuation ||
1466 pgets(true) == 0)
1467 break;
1468 if (pipefp != NULL)
1469 fputs(buf, pipefp);
1470 }
1471 } else if (*t != 'd') {
1472 while (pgets(true)) {
1473 p_input_line++;
1474 if (pipefp != NULL)
1475 fputs(buf, pipefp);
1476 if (strEQ(buf, ".\n"))
1477 break;
1478 }
1479 }
1480 } else {
1481 next_intuit_at(beginning_of_this_line, p_input_line);
1482 break;
1483 }
1484 }
1485 if (pipefp == NULL)
1486 return;
1487 fprintf(pipefp, "w\n");
1488 fprintf(pipefp, "q\n");
1489 fflush(pipefp);
1490 pclose(pipefp);
1491 ignore_signals();
1492 if (!check_only) {
1493 if (move_file(TMPOUTNAME, outname) < 0) {
1494 toutkeep = true;
1495 chmod(TMPOUTNAME, filemode);
1496 } else
1497 chmod(outname, filemode);
1498 }
1499 set_signals(1);
1500 }
1501
1502 /*
1503 * Choose the name of the file to be patched based on POSIX rules.
1504 * NOTE: the POSIX rules are amazingly stupid and we only follow them
1505 * if the user specified --posix or set POSIXLY_CORRECT.
1506 */
1507 static char *
posix_name(const struct file_name * names,bool assume_exists)1508 posix_name(const struct file_name *names, bool assume_exists)
1509 {
1510 char *path = NULL;
1511 int i;
1512
1513 /*
1514 * POSIX states that the filename will be chosen from one
1515 * of the old, new and index names (in that order) if
1516 * the file exists relative to CWD after -p stripping.
1517 */
1518 for (i = 0; i < MAX_FILE; i++) {
1519 if (names[i].path != NULL && names[i].exists) {
1520 path = names[i].path;
1521 break;
1522 }
1523 }
1524 if (path == NULL && !assume_exists) {
1525 /*
1526 * No files found, check to see if the diff could be
1527 * creating a new file.
1528 */
1529 if (path == NULL && ok_to_create_file &&
1530 names[NEW_FILE].path != NULL)
1531 path = names[NEW_FILE].path;
1532 }
1533
1534 return path ? xstrdup(path) : NULL;
1535 }
1536
1537 static char *
compare_names(const struct file_name * names,bool assume_exists)1538 compare_names(const struct file_name *names, bool assume_exists)
1539 {
1540 size_t min_components, min_baselen, min_len, tmp;
1541 char *best = NULL;
1542 char *path;
1543 int i;
1544
1545 /*
1546 * The "best" name is the one with the fewest number of path
1547 * components, the shortest basename length, and the shortest
1548 * overall length (in that order). We only use the Index: file
1549 * if neither of the old or new files could be intuited from
1550 * the diff header.
1551 */
1552 min_components = min_baselen = min_len = SIZE_MAX;
1553 for (i = INDEX_FILE; i >= OLD_FILE; i--) {
1554 path = names[i].path;
1555 if (path == NULL || (!names[i].exists && !assume_exists))
1556 continue;
1557 if ((tmp = num_components(path)) > min_components)
1558 continue;
1559 if (tmp < min_components) {
1560 min_components = tmp;
1561 best = path;
1562 }
1563 if ((tmp = strlen(basename(path))) > min_baselen)
1564 continue;
1565 if (tmp < min_baselen) {
1566 min_baselen = tmp;
1567 best = path;
1568 }
1569 if ((tmp = strlen(path)) > min_len)
1570 continue;
1571 min_len = tmp;
1572 best = path;
1573 }
1574 return best;
1575 }
1576
1577 /*
1578 * Choose the name of the file to be patched based the "best" one
1579 * available.
1580 */
1581 static char *
best_name(const struct file_name * names,bool assume_exists)1582 best_name(const struct file_name *names, bool assume_exists)
1583 {
1584 char *best;
1585
1586 best = compare_names(names, assume_exists);
1587
1588 /* No match? Check to see if the diff could be creating a new file. */
1589 if (best == NULL && ok_to_create_file)
1590 best = names[NEW_FILE].path;
1591
1592 return best ? xstrdup(best) : NULL;
1593 }
1594
1595 static size_t
num_components(const char * path)1596 num_components(const char *path)
1597 {
1598 size_t n;
1599 const char *cp;
1600
1601 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) {
1602 while (*cp == '/')
1603 cp++; /* skip consecutive slashes */
1604 }
1605 return n;
1606 }
1607
1608 /*
1609 * Convert number at NPTR into LINENUM and save address of first
1610 * character that is not a digit in ENDPTR. If conversion is not
1611 * possible, call fatal.
1612 */
1613 static LINENUM
strtolinenum(char * nptr,char ** endptr)1614 strtolinenum(char *nptr, char **endptr)
1615 {
1616 LINENUM rv;
1617 char c;
1618 char *p;
1619 const char *errstr;
1620
1621 for (p = nptr; isdigit((unsigned char)*p); p++)
1622 ;
1623
1624 if (p == nptr)
1625 malformed();
1626
1627 c = *p;
1628 *p = '\0';
1629
1630 rv = strtonum(nptr, 0, LINENUM_MAX, &errstr);
1631 if (errstr != NULL)
1632 fatal("invalid line number at line %ld: `%s' is %s\n",
1633 p_input_line, nptr, errstr);
1634
1635 *p = c;
1636 *endptr = p;
1637
1638 return rv;
1639 }
1640