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 char *source_file;
74
75 static void grow_hunkmax(void);
76 static int intuit_diff_type(void);
77 static void next_intuit_at(off_t, LINENUM);
78 static void skip_to(off_t, LINENUM);
79 static size_t pgets(bool _do_indent);
80 static char *best_name(const struct file_name *, bool);
81 static char *posix_name(const struct file_name *, bool);
82 static size_t num_components(const char *);
83 static LINENUM strtolinenum(char *, char **);
84
85 /*
86 * Prepare to look for the next patch in the patch file.
87 */
88 void
re_patch(void)89 re_patch(void)
90 {
91 p_first = 0;
92 p_newfirst = 0;
93 p_ptrn_lines = 0;
94 p_repl_lines = 0;
95 p_end = (LINENUM) - 1;
96 p_max = 0;
97 p_indent = 0;
98 }
99
100 /*
101 * Open the patch file at the beginning of time.
102 */
103 void
open_patch_file(const char * filename)104 open_patch_file(const char *filename)
105 {
106 struct stat filestat;
107 int nr, nw;
108
109 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) {
110 pfp = fopen(TMPPATNAME, "w");
111 if (pfp == NULL)
112 pfatal("can't create %s", TMPPATNAME);
113 while ((nr = fread(buf, 1, buf_size, stdin)) > 0) {
114 nw = fwrite(buf, 1, nr, pfp);
115 if (nr != nw)
116 pfatal("write error to %s", TMPPATNAME);
117 }
118 if (ferror(pfp) || fclose(pfp))
119 pfatal("can't write %s", TMPPATNAME);
120 filename = TMPPATNAME;
121 }
122 pfp = fopen(filename, "r");
123 if (pfp == NULL)
124 pfatal("patch file %s not found", filename);
125 if (fstat(fileno(pfp), &filestat))
126 pfatal("can't stat %s", filename);
127 p_filesize = filestat.st_size;
128 next_intuit_at(0, 1L); /* start at the beginning */
129 set_hunkmax();
130 }
131
132 /*
133 * Make sure our dynamically realloced tables are malloced to begin with.
134 */
135 void
set_hunkmax(void)136 set_hunkmax(void)
137 {
138 if (p_line == NULL)
139 p_line = malloc(hunkmax * sizeof(char *));
140 if (p_len == NULL)
141 p_len = malloc(hunkmax * sizeof(unsigned short));
142 if (p_char == NULL)
143 p_char = malloc(hunkmax * sizeof(char));
144 }
145
146 /*
147 * Enlarge the arrays containing the current hunk of patch.
148 */
149 static void
grow_hunkmax(void)150 grow_hunkmax(void)
151 {
152 int new_hunkmax = hunkmax * 2;
153
154 if (p_line == NULL || p_len == NULL || p_char == NULL)
155 fatal("Internal memory allocation error\n");
156
157 p_line = reallocf(p_line, new_hunkmax * sizeof(char *));
158 p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short));
159 p_char = reallocf(p_char, new_hunkmax * sizeof(char));
160
161 if (p_line != NULL && p_len != NULL && p_char != NULL) {
162 hunkmax = new_hunkmax;
163 return;
164 }
165
166 if (!using_plan_a)
167 fatal("out of memory\n");
168 out_of_mem = true; /* whatever is null will be allocated again */
169 /* from within plan_a(), of all places */
170 }
171
172 /* True if the remainder of the patch file contains a diff of some sort. */
173
174 bool
there_is_another_patch(void)175 there_is_another_patch(void)
176 {
177 bool exists = false;
178
179 if (p_base != 0 && p_base >= p_filesize) {
180 if (verbose)
181 say("done\n");
182 return false;
183 }
184 if (p_filesize == 0)
185 return false;
186 nonempty_patchf_seen = true;
187 if (verbose)
188 say("Hmm...");
189 diff_type = intuit_diff_type();
190 if (!diff_type) {
191 if (p_base != 0) {
192 if (verbose)
193 say(" Ignoring the trailing garbage.\ndone\n");
194 } else
195 say(" I can't seem to find a patch in there anywhere.\n");
196 return false;
197 }
198 if (verbose)
199 say(" %sooks like %s to me...\n",
200 (p_base == 0 ? "L" : "The next patch l"),
201 diff_type == UNI_DIFF ? "a unified diff" :
202 diff_type == CONTEXT_DIFF ? "a context diff" :
203 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" :
204 diff_type == NORMAL_DIFF ? "a normal diff" :
205 "an ed script");
206 if (p_indent && verbose)
207 say("(Patch is indented %d space%s.)\n", p_indent,
208 p_indent == 1 ? "" : "s");
209 skip_to(p_start, p_sline);
210 while (filearg[0] == NULL) {
211 if (force || batch) {
212 say("No file to patch. Skipping...\n");
213 filearg[0] = xstrdup(bestguess);
214 skip_rest_of_patch = true;
215 return true;
216 }
217 ask("File to patch: ");
218 if (*buf != '\n') {
219 free(bestguess);
220 bestguess = xstrdup(buf);
221 filearg[0] = fetchname(buf, &exists, 0);
222 }
223 /*
224 * fetchname can now return buf = NULL, exists = true, to
225 * indicate to the caller that /dev/null was specified. Retain
226 * previous behavior for now until this can be better evaluted.
227 */
228 if (filearg[0] == NULL || !exists) {
229 int def_skip = *bestguess == '\0';
230 ask("No file found--skip this patch? [%c] ",
231 def_skip ? 'y' : 'n');
232 if (*buf == 'n' || (!def_skip && *buf != 'y'))
233 continue;
234 if (verbose)
235 say("Skipping patch...\n");
236 free(filearg[0]);
237 filearg[0] = fetchname(bestguess, &exists, 0);
238 skip_rest_of_patch = true;
239 return true;
240 }
241 }
242 return true;
243 }
244
245 static void
p4_fetchname(struct file_name * name,char * str)246 p4_fetchname(struct file_name *name, char *str)
247 {
248 char *t, *h;
249
250 /* Skip leading whitespace. */
251 while (isspace((unsigned char)*str))
252 str++;
253
254 /* Remove the file revision number. */
255 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++)
256 if (*t == '#')
257 h = t;
258 if (h != NULL)
259 *h = '\0';
260
261 name->path = fetchname(str, &name->exists, strippath);
262 }
263
264 /* Determine what kind of diff is in the remaining part of the patch file. */
265
266 static int
intuit_diff_type(void)267 intuit_diff_type(void)
268 {
269 off_t this_line = 0, previous_line;
270 off_t first_command_line = -1;
271 LINENUM fcl_line = -1;
272 bool last_line_was_command = false, this_is_a_command = false;
273 bool stars_last_line = false, stars_this_line = false;
274 char *s, *t;
275 int indent, retval;
276 struct file_name names[MAX_FILE];
277 int piece_of_git = 0;
278
279 memset(names, 0, sizeof(names));
280 ok_to_create_file = false;
281 fseeko(pfp, p_base, SEEK_SET);
282 p_input_line = p_bline - 1;
283 for (;;) {
284 previous_line = this_line;
285 last_line_was_command = this_is_a_command;
286 stars_last_line = stars_this_line;
287 this_line = ftello(pfp);
288 indent = 0;
289 p_input_line++;
290 if (pgets(false) == 0) {
291 if (first_command_line >= 0) {
292 /* nothing but deletes!? */
293 p_start = first_command_line;
294 p_sline = fcl_line;
295 retval = ED_DIFF;
296 goto scan_exit;
297 } else {
298 p_start = this_line;
299 p_sline = p_input_line;
300 retval = 0;
301 goto scan_exit;
302 }
303 }
304 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) {
305 if (*s == '\t')
306 indent += 8 - (indent % 8);
307 else
308 indent++;
309 }
310 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++)
311 ;
312 this_is_a_command = (isdigit((unsigned char)*s) &&
313 (*t == 'd' || *t == 'c' || *t == 'a'));
314 if (first_command_line < 0 && this_is_a_command) {
315 first_command_line = this_line;
316 fcl_line = p_input_line;
317 p_indent = indent; /* assume this for now */
318 }
319 if (!stars_last_line && strnEQ(s, "*** ", 4))
320 names[OLD_FILE].path = fetchname(s + 4,
321 &names[OLD_FILE].exists, strippath);
322 else if (strnEQ(s, "--- ", 4)) {
323 size_t off = 4;
324 if (piece_of_git && strippath == 957 &&
325 strnEQ(s, "--- a/", 6))
326 off = 6;
327 names[NEW_FILE].path = fetchname(s + off,
328 &names[NEW_FILE].exists, strippath);
329 } else if (strnEQ(s, "+++ ", 4)) {
330 /* pretend it is the old name */
331 size_t off = 4;
332 if (piece_of_git && strippath == 957 &&
333 strnEQ(s, "+++ b/", 6))
334 off = 6;
335 names[OLD_FILE].path = fetchname(s + off,
336 &names[OLD_FILE].exists, strippath);
337 } else if (strnEQ(s, "Index:", 6))
338 names[INDEX_FILE].path = fetchname(s + 6,
339 &names[INDEX_FILE].exists, strippath);
340 else if (strnEQ(s, "Prereq:", 7)) {
341 for (t = s + 7; isspace((unsigned char)*t); t++)
342 ;
343 revision = xstrdup(t);
344 for (t = revision;
345 *t && !isspace((unsigned char)*t); t++)
346 ;
347 *t = '\0';
348 if (*revision == '\0') {
349 free(revision);
350 revision = NULL;
351 }
352 } else if (strnEQ(s, "diff --git a/", 13)) {
353 /* Git-style diffs. */
354 piece_of_git = 1;
355 } else if (strnEQ(s, "==== ", 5)) {
356 /* Perforce-style diffs. */
357 if ((t = strstr(s + 5, " - ")) != NULL)
358 p4_fetchname(&names[NEW_FILE], t + 3);
359 p4_fetchname(&names[OLD_FILE], s + 5);
360 }
361 if ((!diff_type || diff_type == ED_DIFF) &&
362 first_command_line >= 0 &&
363 strEQ(s, ".\n")) {
364 p_indent = indent;
365 p_start = first_command_line;
366 p_sline = fcl_line;
367 retval = ED_DIFF;
368 goto scan_exit;
369 }
370 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) {
371 if (strnEQ(s + 4, "0,0", 3))
372 ok_to_create_file = true;
373 p_indent = indent;
374 p_start = this_line;
375 p_sline = p_input_line;
376 retval = UNI_DIFF;
377 goto scan_exit;
378 }
379 stars_this_line = strnEQ(s, "********", 8);
380 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line &&
381 strnEQ(s, "*** ", 4)) {
382 if (strtolinenum(s + 4, &s) == 0)
383 ok_to_create_file = true;
384 /*
385 * If this is a new context diff the character just
386 * at the end of the line is a '*'.
387 */
388 while (*s && *s != '\n')
389 s++;
390 p_indent = indent;
391 p_start = previous_line;
392 p_sline = p_input_line - 1;
393 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF);
394 goto scan_exit;
395 }
396 if ((!diff_type || diff_type == NORMAL_DIFF) &&
397 last_line_was_command &&
398 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) {
399 p_start = previous_line;
400 p_sline = p_input_line - 1;
401 p_indent = indent;
402 retval = NORMAL_DIFF;
403 goto scan_exit;
404 }
405 }
406 scan_exit:
407 if (retval == UNI_DIFF) {
408 /* unswap old and new */
409 struct file_name tmp = names[OLD_FILE];
410 names[OLD_FILE] = names[NEW_FILE];
411 names[NEW_FILE] = tmp;
412 }
413
414 /* Invalidated */
415 free(source_file);
416 source_file = NULL;
417
418 if (retval != 0) {
419 /*
420 * If we've successfully determined a diff type, stored in
421 * retval, path == NULL means _PATH_DEVNULL if exists is set.
422 * Explicitly specify it here to make it easier to detect later
423 * on that we're actually creating a file and not that we've
424 * just goofed something up.
425 */
426 if (names[OLD_FILE].path != NULL)
427 source_file = xstrdup(names[OLD_FILE].path);
428 else if (names[OLD_FILE].exists)
429 source_file = xstrdup(_PATH_DEVNULL);
430 }
431 if (filearg[0] == NULL) {
432 if (posix)
433 filearg[0] = posix_name(names, ok_to_create_file);
434 else {
435 /* Ignore the Index: name for context diffs, like GNU */
436 if (names[OLD_FILE].path != NULL ||
437 names[NEW_FILE].path != NULL) {
438 free(names[INDEX_FILE].path);
439 names[INDEX_FILE].path = NULL;
440 }
441 filearg[0] = best_name(names, ok_to_create_file);
442 }
443 }
444
445 free(bestguess);
446 bestguess = NULL;
447 if (filearg[0] != NULL)
448 bestguess = xstrdup(filearg[0]);
449 else if (!ok_to_create_file) {
450 /*
451 * We don't want to create a new file but we need a
452 * filename to set bestguess. Avoid setting filearg[0]
453 * so the file is not created automatically.
454 */
455 if (posix)
456 bestguess = posix_name(names, true);
457 else
458 bestguess = best_name(names, true);
459 }
460 free(names[OLD_FILE].path);
461 free(names[NEW_FILE].path);
462 free(names[INDEX_FILE].path);
463 return retval;
464 }
465
466 /*
467 * Remember where this patch ends so we know where to start up again.
468 */
469 static void
next_intuit_at(off_t file_pos,LINENUM file_line)470 next_intuit_at(off_t file_pos, LINENUM file_line)
471 {
472 p_base = file_pos;
473 p_bline = file_line;
474 }
475
476 /*
477 * Basically a verbose fseeko() to the actual diff listing.
478 */
479 static void
skip_to(off_t file_pos,LINENUM file_line)480 skip_to(off_t file_pos, LINENUM file_line)
481 {
482 size_t len;
483
484 if (p_base > file_pos)
485 fatal("Internal error: seek %lld>%lld\n",
486 (long long)p_base, (long long)file_pos);
487 if (verbose && p_base < file_pos) {
488 fseeko(pfp, p_base, SEEK_SET);
489 say("The text leading up to this was:\n--------------------------\n");
490 while (ftello(pfp) < file_pos) {
491 len = pgets(false);
492 if (len == 0)
493 fatal("Unexpected end of file\n");
494 say("|%s", buf);
495 }
496 say("--------------------------\n");
497 } else
498 fseeko(pfp, file_pos, SEEK_SET);
499 p_input_line = file_line - 1;
500 }
501
502 /* Make this a function for better debugging. */
503 static void
malformed(void)504 malformed(void)
505 {
506 fatal("malformed patch at line %ld: %s", p_input_line, buf);
507 /* about as informative as "Syntax error" in C */
508 }
509
510 /*
511 * True if the line has been discarded (i.e. it is a line saying
512 * "\ No newline at end of file".)
513 */
514 static bool
remove_special_line(void)515 remove_special_line(void)
516 {
517 int c;
518
519 c = fgetc(pfp);
520 if (c == '\\') {
521 do {
522 c = fgetc(pfp);
523 } while (c != EOF && c != '\n');
524
525 return true;
526 }
527 if (c != EOF)
528 fseeko(pfp, -1, SEEK_CUR);
529
530 return false;
531 }
532
533 /*
534 * True if there is more of the current diff listing to process.
535 */
536 bool
another_hunk(void)537 another_hunk(void)
538 {
539 off_t line_beginning; /* file pos of the current line */
540 LINENUM repl_beginning; /* index of --- line */
541 LINENUM fillcnt; /* #lines of missing ptrn or repl */
542 LINENUM fillsrc; /* index of first line to copy */
543 LINENUM filldst; /* index of first missing line */
544 bool ptrn_spaces_eaten; /* ptrn was slightly malformed */
545 bool repl_could_be_missing; /* no + or ! lines in this hunk */
546 bool repl_missing; /* we are now backtracking */
547 off_t repl_backtrack_position; /* file pos of first repl line */
548 LINENUM repl_patch_line; /* input line number for same */
549 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */
550 char *s;
551 size_t len;
552 int context = 0;
553
554 while (p_end >= 0) {
555 if (p_end == p_efake)
556 p_end = p_bfake; /* don't free twice */
557 else
558 free(p_line[p_end]);
559 p_end--;
560 }
561 p_efake = -1;
562
563 p_max = hunkmax; /* gets reduced when --- found */
564 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) {
565 line_beginning = ftello(pfp);
566 repl_beginning = 0;
567 fillcnt = 0;
568 fillsrc = 0;
569 filldst = 0;
570 ptrn_spaces_eaten = false;
571 repl_could_be_missing = true;
572 repl_missing = false;
573 repl_backtrack_position = 0;
574 repl_patch_line = 0;
575 ptrn_copiable = 0;
576
577 len = pgets(true);
578 p_input_line++;
579 if (len == 0 || strnNE(buf, "********", 8)) {
580 next_intuit_at(line_beginning, p_input_line);
581 return false;
582 }
583 p_context = 100;
584 p_hunk_beg = p_input_line + 1;
585 while (p_end < p_max) {
586 line_beginning = ftello(pfp);
587 len = pgets(true);
588 p_input_line++;
589 if (len == 0) {
590 if (repl_beginning && repl_could_be_missing) {
591 repl_missing = true;
592 goto hunk_done;
593 }
594 fatal("unexpected end of file in patch\n");
595 }
596 p_end++;
597 if (p_end >= hunkmax)
598 fatal("Internal error: hunk larger than hunk "
599 "buffer size");
600 p_char[p_end] = *buf;
601 p_line[p_end] = NULL;
602 switch (*buf) {
603 case '*':
604 if (strnEQ(buf, "********", 8)) {
605 if (repl_beginning && repl_could_be_missing) {
606 repl_missing = true;
607 goto hunk_done;
608 } else
609 fatal("unexpected end of hunk "
610 "at line %ld\n",
611 p_input_line);
612 }
613 if (p_end != 0) {
614 if (repl_beginning && repl_could_be_missing) {
615 repl_missing = true;
616 goto hunk_done;
617 }
618 fatal("unexpected *** at line %ld: %s",
619 p_input_line, buf);
620 }
621 context = 0;
622 p_line[p_end] = savestr(buf);
623 if (out_of_mem) {
624 p_end--;
625 return false;
626 }
627 for (s = buf;
628 *s && !isdigit((unsigned char)*s); s++)
629 ;
630 if (!*s)
631 malformed();
632 if (strnEQ(s, "0,0", 3))
633 memmove(s, s + 2, strlen(s + 2) + 1);
634 p_first = strtolinenum(s, &s);
635 if (*s == ',') {
636 for (;
637 *s && !isdigit((unsigned char)*s); s++)
638 ;
639 if (!*s)
640 malformed();
641 p_ptrn_lines = strtolinenum(s, &s) - p_first + 1;
642 if (p_ptrn_lines < 0)
643 malformed();
644 } else if (p_first)
645 p_ptrn_lines = 1;
646 else {
647 p_ptrn_lines = 0;
648 p_first = 1;
649 }
650 if (p_first >= LINENUM_MAX - p_ptrn_lines ||
651 p_ptrn_lines >= LINENUM_MAX - 6)
652 malformed();
653
654 /* we need this much at least */
655 p_max = p_ptrn_lines + 6;
656 while (p_max >= hunkmax)
657 grow_hunkmax();
658 p_max = hunkmax;
659 break;
660 case '-':
661 if (buf[1] == '-') {
662 if (repl_beginning ||
663 (p_end != p_ptrn_lines + 1 +
664 (p_char[p_end - 1] == '\n'))) {
665 if (p_end == 1) {
666 /*
667 * `old' lines were omitted;
668 * set up to fill them in
669 * from 'new' context lines.
670 */
671 p_end = p_ptrn_lines + 1;
672 fillsrc = p_end + 1;
673 filldst = 1;
674 fillcnt = p_ptrn_lines;
675 } else {
676 if (repl_beginning) {
677 if (repl_could_be_missing) {
678 repl_missing = true;
679 goto hunk_done;
680 }
681 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n",
682 p_input_line, p_hunk_beg + repl_beginning);
683 } else {
684 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n",
685 (p_end <= p_ptrn_lines
686 ? "Premature"
687 : "Overdue"),
688 p_input_line, p_hunk_beg);
689 }
690 }
691 }
692 repl_beginning = p_end;
693 repl_backtrack_position = ftello(pfp);
694 repl_patch_line = p_input_line;
695 p_line[p_end] = savestr(buf);
696 if (out_of_mem) {
697 p_end--;
698 return false;
699 }
700 p_char[p_end] = '=';
701 for (s = buf; *s && !isdigit((unsigned char)*s); s++)
702 ;
703 if (!*s)
704 malformed();
705 p_newfirst = strtolinenum(s, &s);
706 if (*s == ',') {
707 for (; *s && !isdigit((unsigned char)*s); s++)
708 ;
709 if (!*s)
710 malformed();
711 p_repl_lines = strtolinenum(s, &s) -
712 p_newfirst + 1;
713 if (p_repl_lines < 0)
714 malformed();
715 } else if (p_newfirst)
716 p_repl_lines = 1;
717 else {
718 p_repl_lines = 0;
719 p_newfirst = 1;
720 }
721 if (p_newfirst >= LINENUM_MAX - p_repl_lines ||
722 p_repl_lines >= LINENUM_MAX - p_end)
723 malformed();
724 p_max = p_repl_lines + p_end;
725 if (p_max > MAXHUNKSIZE)
726 fatal("hunk too large (%ld lines) at line %ld: %s",
727 p_max, p_input_line, buf);
728 while (p_max >= hunkmax)
729 grow_hunkmax();
730 if (p_repl_lines != ptrn_copiable &&
731 (p_context != 0 || p_repl_lines != 1))
732 repl_could_be_missing = false;
733 break;
734 }
735 goto change_line;
736 case '+':
737 case '!':
738 repl_could_be_missing = false;
739 change_line:
740 if (buf[1] == '\n' && canonicalize)
741 strlcpy(buf + 1, " \n", buf_size - 1);
742 if (!isspace((unsigned char)buf[1]) &&
743 buf[1] != '>' && buf[1] != '<' &&
744 repl_beginning && repl_could_be_missing) {
745 repl_missing = true;
746 goto hunk_done;
747 }
748 if (context >= 0) {
749 if (context < p_context)
750 p_context = context;
751 context = -1000;
752 }
753 p_line[p_end] = savestr(buf + 2);
754 if (out_of_mem) {
755 p_end--;
756 return false;
757 }
758 if (p_end == p_ptrn_lines) {
759 if (remove_special_line()) {
760 int l;
761
762 l = strlen(p_line[p_end]) - 1;
763 (p_line[p_end])[l] = 0;
764 }
765 }
766 break;
767 case '\t':
768 case '\n': /* assume the 2 spaces got eaten */
769 if (repl_beginning && repl_could_be_missing &&
770 (!ptrn_spaces_eaten ||
771 diff_type == NEW_CONTEXT_DIFF)) {
772 repl_missing = true;
773 goto hunk_done;
774 }
775 p_line[p_end] = savestr(buf);
776 if (out_of_mem) {
777 p_end--;
778 return false;
779 }
780 if (p_end != p_ptrn_lines + 1) {
781 ptrn_spaces_eaten |= (repl_beginning != 0);
782 context++;
783 if (!repl_beginning)
784 ptrn_copiable++;
785 p_char[p_end] = ' ';
786 }
787 break;
788 case ' ':
789 if (!isspace((unsigned char)buf[1]) &&
790 repl_beginning && repl_could_be_missing) {
791 repl_missing = true;
792 goto hunk_done;
793 }
794 context++;
795 if (!repl_beginning)
796 ptrn_copiable++;
797 p_line[p_end] = savestr(buf + 2);
798 if (out_of_mem) {
799 p_end--;
800 return false;
801 }
802 break;
803 default:
804 if (repl_beginning && repl_could_be_missing) {
805 repl_missing = true;
806 goto hunk_done;
807 }
808 malformed();
809 }
810 /* set up p_len for strncmp() so we don't have to */
811 /* assume null termination */
812 if (p_line[p_end])
813 p_len[p_end] = strlen(p_line[p_end]);
814 else
815 p_len[p_end] = 0;
816 }
817
818 hunk_done:
819 if (p_end >= 0 && !repl_beginning)
820 fatal("no --- found in patch at line %ld\n", pch_hunk_beg());
821
822 if (repl_missing) {
823
824 /* reset state back to just after --- */
825 p_input_line = repl_patch_line;
826 for (p_end--; p_end > repl_beginning; p_end--)
827 free(p_line[p_end]);
828 fseeko(pfp, repl_backtrack_position, SEEK_SET);
829
830 /* redundant 'new' context lines were omitted - set */
831 /* up to fill them in from the old file context */
832 if (!p_context && p_repl_lines == 1) {
833 p_repl_lines = 0;
834 p_max--;
835 }
836 fillsrc = 1;
837 filldst = repl_beginning + 1;
838 fillcnt = p_repl_lines;
839 p_end = p_max;
840 } else if (!p_context && fillcnt == 1) {
841 /* the first hunk was a null hunk with no context */
842 /* and we were expecting one line -- fix it up. */
843 while (filldst < p_end) {
844 p_line[filldst] = p_line[filldst + 1];
845 p_char[filldst] = p_char[filldst + 1];
846 p_len[filldst] = p_len[filldst + 1];
847 filldst++;
848 }
849 #if 0
850 repl_beginning--; /* this doesn't need to be fixed */
851 #endif
852 p_end--;
853 p_first++; /* do append rather than insert */
854 fillcnt = 0;
855 p_ptrn_lines = 0;
856 }
857 if (diff_type == CONTEXT_DIFF &&
858 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) {
859 if (verbose)
860 say("%s\n%s\n%s\n",
861 "(Fascinating--this is really a new-style context diff but without",
862 "the telltale extra asterisks on the *** line that usually indicate",
863 "the new style...)");
864 diff_type = NEW_CONTEXT_DIFF;
865 }
866 /* if there were omitted context lines, fill them in now */
867 if (fillcnt) {
868 p_bfake = filldst; /* remember where not to free() */
869 p_efake = filldst + fillcnt - 1;
870 while (fillcnt-- > 0) {
871 while (fillsrc <= p_end && p_char[fillsrc] != ' ')
872 fillsrc++;
873 if (fillsrc > p_end)
874 fatal("replacement text or line numbers mangled in hunk at line %ld\n",
875 p_hunk_beg);
876 p_line[filldst] = p_line[fillsrc];
877 p_char[filldst] = p_char[fillsrc];
878 p_len[filldst] = p_len[fillsrc];
879 fillsrc++;
880 filldst++;
881 }
882 while (fillsrc <= p_end && fillsrc != repl_beginning &&
883 p_char[fillsrc] != ' ')
884 fillsrc++;
885 #ifdef DEBUGGING
886 if (debug & 64)
887 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n",
888 fillsrc, filldst, repl_beginning, p_end + 1);
889 #endif
890 if (fillsrc != p_end + 1 && fillsrc != repl_beginning)
891 malformed();
892 if (filldst != p_end + 1 && filldst != repl_beginning)
893 malformed();
894 }
895 if (p_line[p_end] != NULL) {
896 if (remove_special_line()) {
897 p_len[p_end] -= 1;
898 (p_line[p_end])[p_len[p_end]] = 0;
899 }
900 }
901 } else if (diff_type == UNI_DIFF) {
902 LINENUM fillold; /* index of old lines */
903 LINENUM fillnew; /* index of new lines */
904 char ch;
905
906 line_beginning = ftello(pfp); /* file pos of the current line */
907 len = pgets(true);
908 p_input_line++;
909 if (len == 0 || strnNE(buf, "@@ -", 4)) {
910 next_intuit_at(line_beginning, p_input_line);
911 return false;
912 }
913 s = buf + 4;
914 if (!*s)
915 malformed();
916 p_first = strtolinenum(s, &s);
917 if (*s == ',') {
918 p_ptrn_lines = strtolinenum(s + 1, &s);
919 } else
920 p_ptrn_lines = 1;
921 if (*s == ' ')
922 s++;
923 if (*s != '+' || !*++s)
924 malformed();
925 p_newfirst = strtolinenum(s, &s);
926 if (*s == ',') {
927 p_repl_lines = strtolinenum(s + 1, &s);
928 } else
929 p_repl_lines = 1;
930 if (*s == ' ')
931 s++;
932 if (*s != '@')
933 malformed();
934 if (p_first >= LINENUM_MAX - p_ptrn_lines ||
935 p_newfirst > LINENUM_MAX - p_repl_lines ||
936 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1)
937 malformed();
938 if (!p_ptrn_lines)
939 p_first++; /* do append rather than insert */
940 p_max = p_ptrn_lines + p_repl_lines + 1;
941 while (p_max >= hunkmax)
942 grow_hunkmax();
943 fillold = 1;
944 fillnew = fillold + p_ptrn_lines;
945 p_end = fillnew + p_repl_lines;
946 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first,
947 p_first + p_ptrn_lines - 1);
948 p_line[0] = savestr(buf);
949 if (out_of_mem) {
950 p_end = -1;
951 return false;
952 }
953 p_char[0] = '*';
954 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst,
955 p_newfirst + p_repl_lines - 1);
956 p_line[fillnew] = savestr(buf);
957 if (out_of_mem) {
958 p_end = 0;
959 return false;
960 }
961 p_char[fillnew++] = '=';
962 p_context = 100;
963 context = 0;
964 p_hunk_beg = p_input_line + 1;
965 while (fillold <= p_ptrn_lines || fillnew <= p_end) {
966 line_beginning = ftello(pfp);
967 len = pgets(true);
968 p_input_line++;
969 if (len == 0) {
970 if (p_max - fillnew < 3) {
971 /* assume blank lines got chopped */
972 strlcpy(buf, " \n", buf_size);
973 } else {
974 fatal("unexpected end of file in patch\n");
975 }
976 }
977 if (*buf == '\t' || *buf == '\n') {
978 ch = ' '; /* assume the space got eaten */
979 s = savestr(buf);
980 } else {
981 ch = *buf;
982 s = savestr(buf + 1);
983 }
984 if (out_of_mem) {
985 while (--fillnew > p_ptrn_lines)
986 free(p_line[fillnew]);
987 p_end = fillold - 1;
988 return false;
989 }
990 switch (ch) {
991 case '-':
992 if (fillold > p_ptrn_lines) {
993 free(s);
994 p_end = fillnew - 1;
995 malformed();
996 }
997 p_char[fillold] = ch;
998 p_line[fillold] = s;
999 p_len[fillold++] = strlen(s);
1000 if (fillold > p_ptrn_lines) {
1001 if (remove_special_line()) {
1002 p_len[fillold - 1] -= 1;
1003 s[p_len[fillold - 1]] = 0;
1004 }
1005 }
1006 break;
1007 case '=':
1008 ch = ' ';
1009 /* FALL THROUGH */
1010 case ' ':
1011 if (fillold > p_ptrn_lines) {
1012 free(s);
1013 while (--fillnew > p_ptrn_lines)
1014 free(p_line[fillnew]);
1015 p_end = fillold - 1;
1016 malformed();
1017 }
1018 context++;
1019 p_char[fillold] = ch;
1020 p_line[fillold] = s;
1021 p_len[fillold++] = strlen(s);
1022 s = savestr(s);
1023 if (out_of_mem) {
1024 while (--fillnew > p_ptrn_lines)
1025 free(p_line[fillnew]);
1026 p_end = fillold - 1;
1027 return false;
1028 }
1029 if (fillold > p_ptrn_lines) {
1030 if (remove_special_line()) {
1031 p_len[fillold - 1] -= 1;
1032 s[p_len[fillold - 1]] = 0;
1033 }
1034 }
1035 /* FALL THROUGH */
1036 case '+':
1037 if (fillnew > p_end) {
1038 free(s);
1039 while (--fillnew > p_ptrn_lines)
1040 free(p_line[fillnew]);
1041 p_end = fillold - 1;
1042 malformed();
1043 }
1044 p_char[fillnew] = ch;
1045 p_line[fillnew] = s;
1046 p_len[fillnew++] = strlen(s);
1047 if (fillold > p_ptrn_lines) {
1048 if (remove_special_line()) {
1049 p_len[fillnew - 1] -= 1;
1050 s[p_len[fillnew - 1]] = 0;
1051 }
1052 }
1053 break;
1054 default:
1055 p_end = fillnew;
1056 malformed();
1057 }
1058 if (ch != ' ' && context > 0) {
1059 if (context < p_context)
1060 p_context = context;
1061 context = -1000;
1062 }
1063 } /* while */
1064 } else { /* normal diff--fake it up */
1065 char hunk_type;
1066 int i;
1067 LINENUM min, max;
1068
1069 line_beginning = ftello(pfp);
1070 p_context = 0;
1071 len = pgets(true);
1072 p_input_line++;
1073 if (len == 0 || !isdigit((unsigned char)*buf)) {
1074 next_intuit_at(line_beginning, p_input_line);
1075 return false;
1076 }
1077 p_first = strtolinenum(buf, &s);
1078 if (*s == ',') {
1079 p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1;
1080 if (p_ptrn_lines < 0)
1081 malformed();
1082 } else
1083 p_ptrn_lines = (*s != 'a');
1084 hunk_type = *s;
1085 if (hunk_type == 'a')
1086 p_first++; /* do append rather than insert */
1087 min = strtolinenum(s + 1, &s);
1088 if (*s == ',')
1089 max = strtolinenum(s + 1, &s);
1090 else
1091 max = min;
1092 if (min < 0 || min > max || max - min == LINENUM_MAX)
1093 malformed();
1094 if (hunk_type == 'd')
1095 min++;
1096 p_newfirst = min;
1097 p_repl_lines = max - min + 1;
1098 if (p_newfirst > LINENUM_MAX - p_repl_lines ||
1099 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1)
1100 malformed();
1101 p_end = p_ptrn_lines + p_repl_lines + 1;
1102 if (p_end > MAXHUNKSIZE)
1103 fatal("hunk too large (%ld lines) at line %ld: %s",
1104 p_end, p_input_line, buf);
1105 while (p_end >= hunkmax)
1106 grow_hunkmax();
1107 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first,
1108 p_first + p_ptrn_lines - 1);
1109 p_line[0] = savestr(buf);
1110 if (out_of_mem) {
1111 p_end = -1;
1112 return false;
1113 }
1114 p_char[0] = '*';
1115 for (i = 1; i <= p_ptrn_lines; i++) {
1116 len = pgets(true);
1117 p_input_line++;
1118 if (len == 0)
1119 fatal("unexpected end of file in patch at line %ld\n",
1120 p_input_line);
1121 if (*buf != '<')
1122 fatal("< expected at line %ld of patch\n",
1123 p_input_line);
1124 p_line[i] = savestr(buf + 2);
1125 if (out_of_mem) {
1126 p_end = i - 1;
1127 return false;
1128 }
1129 p_len[i] = strlen(p_line[i]);
1130 p_char[i] = '-';
1131 }
1132
1133 if (remove_special_line()) {
1134 p_len[i - 1] -= 1;
1135 (p_line[i - 1])[p_len[i - 1]] = 0;
1136 }
1137 if (hunk_type == 'c') {
1138 len = pgets(true);
1139 p_input_line++;
1140 if (len == 0)
1141 fatal("unexpected end of file in patch at line %ld\n",
1142 p_input_line);
1143 if (*buf != '-')
1144 fatal("--- expected at line %ld of patch\n",
1145 p_input_line);
1146 }
1147 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max);
1148 p_line[i] = savestr(buf);
1149 if (out_of_mem) {
1150 p_end = i - 1;
1151 return false;
1152 }
1153 p_char[i] = '=';
1154 for (i++; i <= p_end; i++) {
1155 len = pgets(true);
1156 p_input_line++;
1157 if (len == 0)
1158 fatal("unexpected end of file in patch at line %ld\n",
1159 p_input_line);
1160 if (*buf != '>')
1161 fatal("> expected at line %ld of patch\n",
1162 p_input_line);
1163 /* Don't overrun if we don't have enough line */
1164 if (len > 2)
1165 p_line[i] = savestr(buf + 2);
1166 else
1167 p_line[i] = savestr("");
1168
1169 if (out_of_mem) {
1170 p_end = i - 1;
1171 return false;
1172 }
1173 p_len[i] = strlen(p_line[i]);
1174 p_char[i] = '+';
1175 }
1176
1177 if (remove_special_line()) {
1178 p_len[i - 1] -= 1;
1179 (p_line[i - 1])[p_len[i - 1]] = 0;
1180 }
1181 }
1182 if (reverse) /* backwards patch? */
1183 if (!pch_swap())
1184 say("Not enough memory to swap next hunk!\n");
1185 #ifdef DEBUGGING
1186 if (debug & 2) {
1187 LINENUM i;
1188 char special;
1189
1190 for (i = 0; i <= p_end; i++) {
1191 if (i == p_ptrn_lines)
1192 special = '^';
1193 else
1194 special = ' ';
1195 fprintf(stderr, "%3ld %c %c %s", i, p_char[i],
1196 special, p_line[i]);
1197 fflush(stderr);
1198 }
1199 }
1200 #endif
1201 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */
1202 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */
1203 return true;
1204 }
1205
1206 /*
1207 * Input a line from the patch file.
1208 * Worry about indentation if do_indent is true.
1209 * The line is read directly into the buf global variable which
1210 * is resized if necessary in order to hold the complete line.
1211 * Returns the number of characters read including the terminating
1212 * '\n', if any.
1213 */
1214 size_t
pgets(bool do_indent)1215 pgets(bool do_indent)
1216 {
1217 char *line;
1218 size_t len;
1219 int indent = 0, skipped = 0;
1220
1221 line = fgetln(pfp, &len);
1222 if (line != NULL) {
1223 if (len + 1 > buf_size) {
1224 while (len + 1 > buf_size)
1225 buf_size *= 2;
1226 free(buf);
1227 buf = malloc(buf_size);
1228 if (buf == NULL)
1229 fatal("out of memory\n");
1230 }
1231 if (do_indent == 1 && p_indent) {
1232 for (;
1233 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X');
1234 line++, skipped++) {
1235 if (*line == '\t')
1236 indent += 8 - (indent %7);
1237 else
1238 indent++;
1239 }
1240 }
1241 memcpy(buf, line, len - skipped);
1242 buf[len - skipped] = '\0';
1243 }
1244 return len;
1245 }
1246
1247
1248 /*
1249 * Reverse the old and new portions of the current hunk.
1250 */
1251 bool
pch_swap(void)1252 pch_swap(void)
1253 {
1254 char **tp_line; /* the text of the hunk */
1255 unsigned short *tp_len;/* length of each line */
1256 char *tp_char; /* +, -, and ! */
1257 LINENUM i;
1258 LINENUM n;
1259 bool blankline = false;
1260 char *s;
1261
1262 i = p_first;
1263 p_first = p_newfirst;
1264 p_newfirst = i;
1265
1266 /* make a scratch copy */
1267
1268 tp_line = p_line;
1269 tp_len = p_len;
1270 tp_char = p_char;
1271 p_line = NULL; /* force set_hunkmax to allocate again */
1272 p_len = NULL;
1273 p_char = NULL;
1274 set_hunkmax();
1275 if (p_line == NULL || p_len == NULL || p_char == NULL) {
1276
1277 free(p_line);
1278 p_line = tp_line;
1279 free(p_len);
1280 p_len = tp_len;
1281 free(p_char);
1282 p_char = tp_char;
1283 return false; /* not enough memory to swap hunk! */
1284 }
1285 /* now turn the new into the old */
1286
1287 i = p_ptrn_lines + 1;
1288 if (tp_char[i] == '\n') { /* account for possible blank line */
1289 blankline = true;
1290 i++;
1291 }
1292 if (p_efake >= 0) { /* fix non-freeable ptr range */
1293 if (p_efake <= i)
1294 n = p_end - i + 1;
1295 else
1296 n = -i;
1297 p_efake += n;
1298 p_bfake += n;
1299 }
1300 for (n = 0; i <= p_end; i++, n++) {
1301 p_line[n] = tp_line[i];
1302 p_char[n] = tp_char[i];
1303 if (p_char[n] == '+')
1304 p_char[n] = '-';
1305 p_len[n] = tp_len[i];
1306 }
1307 if (blankline) {
1308 i = p_ptrn_lines + 1;
1309 p_line[n] = tp_line[i];
1310 p_char[n] = tp_char[i];
1311 p_len[n] = tp_len[i];
1312 n++;
1313 }
1314 if (p_char[0] != '=')
1315 fatal("Malformed patch at line %ld: expected '=' found '%c'\n",
1316 p_input_line, p_char[0]);
1317 p_char[0] = '*';
1318 for (s = p_line[0]; *s; s++)
1319 if (*s == '-')
1320 *s = '*';
1321
1322 /* now turn the old into the new */
1323
1324 if (p_char[0] != '*')
1325 fatal("Malformed patch at line %ld: expected '*' found '%c'\n",
1326 p_input_line, p_char[0]);
1327 tp_char[0] = '=';
1328 for (s = tp_line[0]; *s; s++)
1329 if (*s == '*')
1330 *s = '-';
1331 for (i = 0; n <= p_end; i++, n++) {
1332 p_line[n] = tp_line[i];
1333 p_char[n] = tp_char[i];
1334 if (p_char[n] == '-')
1335 p_char[n] = '+';
1336 p_len[n] = tp_len[i];
1337 }
1338
1339 if (i != p_ptrn_lines + 1)
1340 fatal("Malformed patch at line %ld: expected %ld lines, "
1341 "got %ld\n",
1342 p_input_line, p_ptrn_lines + 1, i);
1343
1344 i = p_ptrn_lines;
1345 p_ptrn_lines = p_repl_lines;
1346 p_repl_lines = i;
1347
1348 free(tp_line);
1349 free(tp_len);
1350 free(tp_char);
1351
1352 return true;
1353 }
1354
1355 /*
1356 * Return the specified line position in the old file of the old context.
1357 */
1358 LINENUM
pch_first(void)1359 pch_first(void)
1360 {
1361 return p_first;
1362 }
1363
1364 /*
1365 * Return the number of lines of old context.
1366 */
1367 LINENUM
pch_ptrn_lines(void)1368 pch_ptrn_lines(void)
1369 {
1370 return p_ptrn_lines;
1371 }
1372
1373 /*
1374 * Return the probable line position in the new file of the first line.
1375 */
1376 LINENUM
pch_newfirst(void)1377 pch_newfirst(void)
1378 {
1379 return p_newfirst;
1380 }
1381
1382 /*
1383 * Return the number of lines in the replacement text including context.
1384 */
1385 LINENUM
pch_repl_lines(void)1386 pch_repl_lines(void)
1387 {
1388 return p_repl_lines;
1389 }
1390
1391 /*
1392 * Return the number of lines in the whole hunk.
1393 */
1394 LINENUM
pch_end(void)1395 pch_end(void)
1396 {
1397 return p_end;
1398 }
1399
1400 /*
1401 * Return the number of context lines before the first changed line.
1402 */
1403 LINENUM
pch_context(void)1404 pch_context(void)
1405 {
1406 return p_context;
1407 }
1408
1409 /*
1410 * Return the length of a particular patch line.
1411 */
1412 unsigned short
pch_line_len(LINENUM line)1413 pch_line_len(LINENUM line)
1414 {
1415 return p_len[line];
1416 }
1417
1418 /*
1419 * Return the control character (+, -, *, !, etc) for a patch line.
1420 */
1421 char
pch_char(LINENUM line)1422 pch_char(LINENUM line)
1423 {
1424 return p_char[line];
1425 }
1426
1427 /*
1428 * Return a pointer to a particular patch line.
1429 */
1430 char *
pfetch(LINENUM line)1431 pfetch(LINENUM line)
1432 {
1433 return p_line[line];
1434 }
1435
1436 /*
1437 * Return where in the patch file this hunk began, for error messages.
1438 */
1439 LINENUM
pch_hunk_beg(void)1440 pch_hunk_beg(void)
1441 {
1442 return p_hunk_beg;
1443 }
1444
1445 /*
1446 * Apply an ed script by feeding ed itself.
1447 */
1448 void
do_ed_script(void)1449 do_ed_script(void)
1450 {
1451 char *t;
1452 off_t beginning_of_this_line;
1453 FILE *pipefp = NULL;
1454 int continuation;
1455
1456 if (!skip_rest_of_patch) {
1457 if (copy_file(filearg[0], TMPOUTNAME) < 0) {
1458 unlink(TMPOUTNAME);
1459 fatal("can't create temp file %s", TMPOUTNAME);
1460 }
1461 snprintf(buf, buf_size, "%s%s%s", _PATH_RED,
1462 verbose ? " " : " -s ", TMPOUTNAME);
1463 pipefp = popen(buf, "w");
1464 }
1465 for (;;) {
1466 beginning_of_this_line = ftello(pfp);
1467 if (pgets(true) == 0) {
1468 next_intuit_at(beginning_of_this_line, p_input_line);
1469 break;
1470 }
1471 p_input_line++;
1472 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++)
1473 ;
1474 /* POSIX defines allowed commands as {a,c,d,i,s} */
1475 if (isdigit((unsigned char)*buf) &&
1476 (*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) {
1477 if (pipefp != NULL)
1478 fputs(buf, pipefp);
1479 if (*t == 's') {
1480 for (;;) {
1481 continuation = 0;
1482 t = strchr(buf, '\0') - 1;
1483 while (--t >= buf && *t == '\\')
1484 continuation = !continuation;
1485 if (!continuation ||
1486 pgets(true) == 0)
1487 break;
1488 if (pipefp != NULL)
1489 fputs(buf, pipefp);
1490 }
1491 } else if (*t != 'd') {
1492 while (pgets(true)) {
1493 p_input_line++;
1494 if (pipefp != NULL)
1495 fputs(buf, pipefp);
1496 if (strEQ(buf, ".\n"))
1497 break;
1498 }
1499 }
1500 } else {
1501 next_intuit_at(beginning_of_this_line, p_input_line);
1502 break;
1503 }
1504 }
1505 if (pipefp == NULL)
1506 return;
1507 fprintf(pipefp, "w\n");
1508 fprintf(pipefp, "q\n");
1509 fflush(pipefp);
1510 pclose(pipefp);
1511 ignore_signals();
1512 if (!check_only) {
1513 if (move_file(TMPOUTNAME, outname) < 0) {
1514 toutkeep = true;
1515 chmod(TMPOUTNAME, filemode);
1516 } else
1517 chmod(outname, filemode);
1518 }
1519 set_signals(1);
1520 }
1521
1522 /*
1523 * Choose the name of the file to be patched based on POSIX rules.
1524 * NOTE: the POSIX rules are amazingly stupid and we only follow them
1525 * if the user specified --posix or set POSIXLY_CORRECT.
1526 */
1527 static char *
posix_name(const struct file_name * names,bool assume_exists)1528 posix_name(const struct file_name *names, bool assume_exists)
1529 {
1530 char *path = NULL;
1531 int i;
1532
1533 /*
1534 * POSIX states that the filename will be chosen from one
1535 * of the old, new and index names (in that order) if
1536 * the file exists relative to CWD after -p stripping.
1537 */
1538 for (i = 0; i < MAX_FILE; i++) {
1539 if (names[i].path != NULL && names[i].exists) {
1540 path = names[i].path;
1541 break;
1542 }
1543 }
1544 if (path == NULL && !assume_exists) {
1545 /*
1546 * No files found, check to see if the diff could be
1547 * creating a new file.
1548 */
1549 if (path == NULL && ok_to_create_file &&
1550 names[NEW_FILE].path != NULL)
1551 path = names[NEW_FILE].path;
1552 }
1553
1554 return path ? xstrdup(path) : NULL;
1555 }
1556
1557 static char *
compare_names(const struct file_name * names,bool assume_exists)1558 compare_names(const struct file_name *names, bool assume_exists)
1559 {
1560 size_t min_components, min_baselen, min_len, tmp;
1561 char *best = NULL;
1562 char *path;
1563 int i;
1564
1565 /*
1566 * The "best" name is the one with the fewest number of path
1567 * components, the shortest basename length, and the shortest
1568 * overall length (in that order). We only use the Index: file
1569 * if neither of the old or new files could be intuited from
1570 * the diff header.
1571 */
1572 min_components = min_baselen = min_len = SIZE_MAX;
1573 for (i = INDEX_FILE; i >= OLD_FILE; i--) {
1574 path = names[i].path;
1575 if (path == NULL || (!names[i].exists && !assume_exists))
1576 continue;
1577 if ((tmp = num_components(path)) > min_components)
1578 continue;
1579 if (tmp < min_components) {
1580 min_components = tmp;
1581 best = path;
1582 }
1583 if ((tmp = strlen(basename(path))) > min_baselen)
1584 continue;
1585 if (tmp < min_baselen) {
1586 min_baselen = tmp;
1587 best = path;
1588 }
1589 if ((tmp = strlen(path)) > min_len)
1590 continue;
1591 min_len = tmp;
1592 best = path;
1593 }
1594 return best;
1595 }
1596
1597 /*
1598 * Choose the name of the file to be patched based the "best" one
1599 * available.
1600 */
1601 static char *
best_name(const struct file_name * names,bool assume_exists)1602 best_name(const struct file_name *names, bool assume_exists)
1603 {
1604 char *best;
1605
1606 best = compare_names(names, assume_exists);
1607
1608 /* No match? Check to see if the diff could be creating a new file. */
1609 if (best == NULL && ok_to_create_file)
1610 best = names[NEW_FILE].path;
1611
1612 return best ? xstrdup(best) : NULL;
1613 }
1614
1615 static size_t
num_components(const char * path)1616 num_components(const char *path)
1617 {
1618 size_t n;
1619 const char *cp;
1620
1621 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) {
1622 while (*cp == '/')
1623 cp++; /* skip consecutive slashes */
1624 }
1625 return n;
1626 }
1627
1628 /*
1629 * Convert number at NPTR into LINENUM and save address of first
1630 * character that is not a digit in ENDPTR. If conversion is not
1631 * possible, call fatal.
1632 */
1633 static LINENUM
strtolinenum(char * nptr,char ** endptr)1634 strtolinenum(char *nptr, char **endptr)
1635 {
1636 LINENUM rv;
1637 char c;
1638 char *p;
1639 const char *errstr;
1640
1641 for (p = nptr; isdigit((unsigned char)*p); p++)
1642 ;
1643
1644 if (p == nptr)
1645 malformed();
1646
1647 c = *p;
1648 *p = '\0';
1649
1650 rv = strtonum(nptr, 0, LINENUM_MAX, &errstr);
1651 if (errstr != NULL)
1652 fatal("invalid line number at line %ld: `%s' is %s\n",
1653 p_input_line, nptr, errstr);
1654
1655 *p = c;
1656 *endptr = p;
1657
1658 return rv;
1659 }
1660