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: patch.c,v 1.54 2014/12/13 10:31:07 tobias Exp $
27 * $FreeBSD$
28 *
29 */
30
31 #include <sys/types.h>
32 #include <sys/stat.h>
33
34 #include <ctype.h>
35 #include <getopt.h>
36 #include <limits.h>
37 #include <stdio.h>
38 #include <string.h>
39 #include <stdlib.h>
40 #include <unistd.h>
41
42 #include "common.h"
43 #include "util.h"
44 #include "pch.h"
45 #include "inp.h"
46 #include "backupfile.h"
47 #include "pathnames.h"
48
49 mode_t filemode = 0644;
50
51 char *buf; /* general purpose buffer */
52 size_t buf_size; /* size of the general purpose buffer */
53
54 bool using_plan_a = true; /* try to keep everything in memory */
55 bool out_of_mem = false; /* ran out of memory in plan a */
56 bool nonempty_patchf_seen = false; /* seen nonempty patch file? */
57
58 #define MAXFILEC 2
59
60 char *filearg[MAXFILEC];
61 bool ok_to_create_file = false;
62 char *outname = NULL;
63 char *origprae = NULL;
64 char *TMPOUTNAME;
65 char *TMPINNAME;
66 char *TMPREJNAME;
67 char *TMPPATNAME;
68 bool toutkeep = false;
69 bool trejkeep = false;
70 bool warn_on_invalid_line;
71 bool last_line_missing_eol;
72
73 #ifdef DEBUGGING
74 int debug = 0;
75 #endif
76
77 bool force = false;
78 bool batch = false;
79 bool verbose = true;
80 bool reverse = false;
81 bool noreverse = false;
82 bool skip_rest_of_patch = false;
83 int strippath = 957;
84 bool canonicalize = false;
85 bool check_only = false;
86 int diff_type = 0;
87 char *revision = NULL; /* prerequisite revision, if any */
88 LINENUM input_lines = 0; /* how long is input file in lines */
89 int posix = 0; /* strict POSIX mode? */
90
91 static void reinitialize_almost_everything(void);
92 static void get_some_switches(void);
93 static LINENUM locate_hunk(LINENUM);
94 static void abort_context_hunk(void);
95 static void rej_line(int, LINENUM);
96 static void abort_hunk(void);
97 static void apply_hunk(LINENUM);
98 static void init_output(const char *);
99 static void init_reject(const char *);
100 static void copy_till(LINENUM, bool);
101 static bool spew_output(void);
102 static void dump_line(LINENUM, bool);
103 static bool patch_match(LINENUM, LINENUM, LINENUM);
104 static bool similar(const char *, const char *, int);
105 static void usage(void);
106
107 /* true if -E was specified on command line. */
108 static bool remove_empty_files = false;
109
110 /* true if -R was specified on command line. */
111 static bool reverse_flag_specified = false;
112
113 static bool Vflag = false;
114
115 /* buffer holding the name of the rejected patch file. */
116 static char rejname[PATH_MAX];
117
118 /* how many input lines have been irretractibly output */
119 static LINENUM last_frozen_line = 0;
120
121 static int Argc; /* guess */
122 static char **Argv;
123 static int Argc_last; /* for restarting plan_b */
124 static char **Argv_last;
125
126 static FILE *ofp = NULL; /* output file pointer */
127 static FILE *rejfp = NULL; /* reject file pointer */
128
129 static int filec = 0; /* how many file arguments? */
130 static LINENUM last_offset = 0;
131 static LINENUM maxfuzz = 2;
132
133 /* patch using ifdef, ifndef, etc. */
134 static bool do_defines = false;
135 /* #ifdef xyzzy */
136 static char if_defined[128];
137 /* #ifndef xyzzy */
138 static char not_defined[128];
139 /* #else */
140 static const char else_defined[] = "#else\n";
141 /* #endif xyzzy */
142 static char end_defined[128];
143
144
145 /* Apply a set of diffs as appropriate. */
146
147 int
main(int argc,char * argv[])148 main(int argc, char *argv[])
149 {
150 int error = 0, hunk, failed, i, fd;
151 bool patch_seen, reverse_seen;
152 LINENUM where = 0, newwhere, fuzz, mymaxfuzz;
153 const char *tmpdir;
154 char *v;
155
156 setvbuf(stdout, NULL, _IOLBF, 0);
157 setvbuf(stderr, NULL, _IOLBF, 0);
158 for (i = 0; i < MAXFILEC; i++)
159 filearg[i] = NULL;
160
161 buf_size = INITLINELEN;
162 buf = malloc((unsigned)(buf_size));
163 if (buf == NULL)
164 fatal("out of memory\n");
165
166 /* Cons up the names of the temporary files. */
167 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0')
168 tmpdir = _PATH_TMP;
169 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--)
170 ;
171 i++;
172 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1)
173 fatal("cannot allocate memory");
174 if ((fd = mkstemp(TMPOUTNAME)) < 0)
175 pfatal("can't create %s", TMPOUTNAME);
176 close(fd);
177
178 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1)
179 fatal("cannot allocate memory");
180 if ((fd = mkstemp(TMPINNAME)) < 0)
181 pfatal("can't create %s", TMPINNAME);
182 close(fd);
183
184 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1)
185 fatal("cannot allocate memory");
186 if ((fd = mkstemp(TMPREJNAME)) < 0)
187 pfatal("can't create %s", TMPREJNAME);
188 close(fd);
189
190 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1)
191 fatal("cannot allocate memory");
192 if ((fd = mkstemp(TMPPATNAME)) < 0)
193 pfatal("can't create %s", TMPPATNAME);
194 close(fd);
195
196 v = getenv("SIMPLE_BACKUP_SUFFIX");
197 if (v)
198 simple_backup_suffix = v;
199 else
200 simple_backup_suffix = ORIGEXT;
201
202 /* parse switches */
203 Argc = argc;
204 Argv = argv;
205 get_some_switches();
206
207 if (!Vflag) {
208 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL)
209 v = getenv("VERSION_CONTROL");
210 if (v != NULL || !posix)
211 backup_type = get_version(v); /* OK to pass NULL. */
212 }
213
214 /* make sure we clean up /tmp in case of disaster */
215 set_signals(0);
216
217 patch_seen = false;
218 for (open_patch_file(filearg[1]); there_is_another_patch();
219 reinitialize_almost_everything()) {
220 /* for each patch in patch file */
221
222 patch_seen = true;
223
224 warn_on_invalid_line = true;
225
226 if (outname == NULL)
227 outname = xstrdup(filearg[0]);
228
229 /* for ed script just up and do it and exit */
230 if (diff_type == ED_DIFF) {
231 do_ed_script();
232 continue;
233 }
234 /* initialize the patched file */
235 if (!skip_rest_of_patch)
236 init_output(TMPOUTNAME);
237
238 /* initialize reject file */
239 init_reject(TMPREJNAME);
240
241 /* find out where all the lines are */
242 if (!skip_rest_of_patch)
243 scan_input(filearg[0]);
244
245 /*
246 * from here on, open no standard i/o files, because
247 * malloc might misfire and we can't catch it easily
248 */
249
250 /* apply each hunk of patch */
251 hunk = 0;
252 failed = 0;
253 reverse_seen = false;
254 out_of_mem = false;
255 while (another_hunk()) {
256 hunk++;
257 fuzz = 0;
258 mymaxfuzz = pch_context();
259 if (maxfuzz < mymaxfuzz)
260 mymaxfuzz = maxfuzz;
261 if (!skip_rest_of_patch) {
262 do {
263 where = locate_hunk(fuzz);
264 if (hunk == 1 && where == 0 && !force && !reverse_seen) {
265 /* dwim for reversed patch? */
266 if (!pch_swap()) {
267 if (fuzz == 0)
268 say("Not enough memory to try swapped hunk! Assuming unswapped.\n");
269 continue;
270 }
271 reverse = !reverse;
272 /* try again */
273 where = locate_hunk(fuzz);
274 if (where == 0) {
275 /* didn't find it swapped */
276 if (!pch_swap())
277 /* put it back to normal */
278 fatal("lost hunk on alloc error!\n");
279 reverse = !reverse;
280 } else if (noreverse) {
281 if (!pch_swap())
282 /* put it back to normal */
283 fatal("lost hunk on alloc error!\n");
284 reverse = !reverse;
285 say("Ignoring previously applied (or reversed) patch.\n");
286 skip_rest_of_patch = true;
287 } else if (batch) {
288 if (verbose)
289 say("%seversed (or previously applied) patch detected! %s -R.",
290 reverse ? "R" : "Unr",
291 reverse ? "Assuming" : "Ignoring");
292 } else {
293 ask("%seversed (or previously applied) patch detected! %s -R? [y] ",
294 reverse ? "R" : "Unr",
295 reverse ? "Assume" : "Ignore");
296 if (*buf == 'n') {
297 ask("Apply anyway? [n] ");
298 if (*buf != 'y')
299 skip_rest_of_patch = true;
300 else
301 reverse_seen = true;
302 where = 0;
303 reverse = !reverse;
304 if (!pch_swap())
305 /* put it back to normal */
306 fatal("lost hunk on alloc error!\n");
307 }
308 }
309 }
310 } while (!skip_rest_of_patch && where == 0 &&
311 ++fuzz <= mymaxfuzz);
312
313 if (skip_rest_of_patch) { /* just got decided */
314 if (ferror(ofp) || fclose(ofp)) {
315 say("Error writing %s\n",
316 TMPOUTNAME);
317 error = 1;
318 }
319 ofp = NULL;
320 }
321 }
322 newwhere = pch_newfirst() + last_offset;
323 if (skip_rest_of_patch) {
324 abort_hunk();
325 failed++;
326 if (verbose)
327 say("Hunk #%d ignored at %ld.\n",
328 hunk, newwhere);
329 } else if (where == 0) {
330 abort_hunk();
331 failed++;
332 if (verbose)
333 say("Hunk #%d failed at %ld.\n",
334 hunk, newwhere);
335 } else {
336 apply_hunk(where);
337 if (verbose) {
338 say("Hunk #%d succeeded at %ld",
339 hunk, newwhere);
340 if (fuzz != 0)
341 say(" with fuzz %ld", fuzz);
342 if (last_offset)
343 say(" (offset %ld line%s)",
344 last_offset,
345 last_offset == 1L ? "" : "s");
346 say(".\n");
347 }
348 }
349 }
350
351 if (out_of_mem && using_plan_a) {
352 Argc = Argc_last;
353 Argv = Argv_last;
354 say("\n\nRan out of memory using Plan A--trying again...\n\n");
355 if (ofp)
356 fclose(ofp);
357 ofp = NULL;
358 if (rejfp)
359 fclose(rejfp);
360 rejfp = NULL;
361 continue;
362 }
363 if (hunk == 0)
364 fatal("Internal error: hunk should not be 0\n");
365
366 /* finish spewing out the new file */
367 if (!skip_rest_of_patch && !spew_output()) {
368 say("Can't write %s\n", TMPOUTNAME);
369 error = 1;
370 }
371
372 /* and put the output where desired */
373 ignore_signals();
374 if (!skip_rest_of_patch) {
375 struct stat statbuf;
376 char *realout = outname;
377
378 if (!check_only) {
379 if (move_file(TMPOUTNAME, outname) < 0) {
380 toutkeep = true;
381 realout = TMPOUTNAME;
382 chmod(TMPOUTNAME, filemode);
383 } else
384 chmod(outname, filemode);
385
386 if (remove_empty_files &&
387 stat(realout, &statbuf) == 0 &&
388 statbuf.st_size == 0) {
389 if (verbose)
390 say("Removing %s (empty after patching).\n",
391 realout);
392 unlink(realout);
393 }
394 }
395 }
396 if (ferror(rejfp) || fclose(rejfp)) {
397 say("Error writing %s\n", rejname);
398 error = 1;
399 }
400 rejfp = NULL;
401 if (failed) {
402 error = 1;
403 if (*rejname == '\0') {
404 if (strlcpy(rejname, outname,
405 sizeof(rejname)) >= sizeof(rejname))
406 fatal("filename %s is too long\n", outname);
407 if (strlcat(rejname, REJEXT,
408 sizeof(rejname)) >= sizeof(rejname))
409 fatal("filename %s is too long\n", outname);
410 }
411 if (!check_only)
412 say("%d out of %d hunks %s--saving rejects to %s\n",
413 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname);
414 else
415 say("%d out of %d hunks %s while patching %s\n",
416 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", filearg[0]);
417 if (!check_only && move_file(TMPREJNAME, rejname) < 0)
418 trejkeep = true;
419 }
420 set_signals(1);
421 }
422
423 if (!patch_seen && nonempty_patchf_seen)
424 error = 2;
425
426 my_exit(error);
427 /* NOTREACHED */
428 }
429
430 /* Prepare to find the next patch to do in the patch file. */
431
432 static void
reinitialize_almost_everything(void)433 reinitialize_almost_everything(void)
434 {
435 re_patch();
436 re_input();
437
438 input_lines = 0;
439 last_frozen_line = 0;
440
441 filec = 0;
442 if (!out_of_mem) {
443 free(filearg[0]);
444 filearg[0] = NULL;
445 }
446
447 free(outname);
448 outname = NULL;
449
450 last_offset = 0;
451 diff_type = 0;
452
453 free(revision);
454 revision = NULL;
455
456 reverse = reverse_flag_specified;
457 skip_rest_of_patch = false;
458
459 get_some_switches();
460 }
461
462 /* Process switches and filenames. */
463
464 static void
get_some_switches(void)465 get_some_switches(void)
466 {
467 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:";
468 static struct option longopts[] = {
469 {"backup", no_argument, 0, 'b'},
470 {"batch", no_argument, 0, 't'},
471 {"check", no_argument, 0, 'C'},
472 {"context", no_argument, 0, 'c'},
473 {"debug", required_argument, 0, 'x'},
474 {"directory", required_argument, 0, 'd'},
475 {"dry-run", no_argument, 0, 'C'},
476 {"ed", no_argument, 0, 'e'},
477 {"force", no_argument, 0, 'f'},
478 {"forward", no_argument, 0, 'N'},
479 {"fuzz", required_argument, 0, 'F'},
480 {"ifdef", required_argument, 0, 'D'},
481 {"input", required_argument, 0, 'i'},
482 {"ignore-whitespace", no_argument, 0, 'l'},
483 {"normal", no_argument, 0, 'n'},
484 {"output", required_argument, 0, 'o'},
485 {"prefix", required_argument, 0, 'B'},
486 {"quiet", no_argument, 0, 's'},
487 {"reject-file", required_argument, 0, 'r'},
488 {"remove-empty-files", no_argument, 0, 'E'},
489 {"reverse", no_argument, 0, 'R'},
490 {"silent", no_argument, 0, 's'},
491 {"strip", required_argument, 0, 'p'},
492 {"suffix", required_argument, 0, 'z'},
493 {"unified", no_argument, 0, 'u'},
494 {"version", no_argument, 0, 'v'},
495 {"version-control", required_argument, 0, 'V'},
496 {"posix", no_argument, &posix, 1},
497 {NULL, 0, 0, 0}
498 };
499 int ch;
500
501 rejname[0] = '\0';
502 Argc_last = Argc;
503 Argv_last = Argv;
504 if (!Argc)
505 return;
506 optreset = optind = 1;
507 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) {
508 switch (ch) {
509 case 'b':
510 if (backup_type == none)
511 backup_type = numbered_existing;
512 if (optarg == NULL)
513 break;
514 if (verbose)
515 say("Warning, the ``-b suffix'' option has been"
516 " obsoleted by the -z option.\n");
517 /* FALLTHROUGH */
518 case 'z':
519 /* must directly follow 'b' case for backwards compat */
520 simple_backup_suffix = xstrdup(optarg);
521 break;
522 case 'B':
523 origprae = xstrdup(optarg);
524 break;
525 case 'c':
526 diff_type = CONTEXT_DIFF;
527 break;
528 case 'C':
529 check_only = true;
530 break;
531 case 'd':
532 if (chdir(optarg) < 0)
533 pfatal("can't cd to %s", optarg);
534 break;
535 case 'D':
536 do_defines = true;
537 if (!isalpha((unsigned char)*optarg) && *optarg != '_')
538 fatal("argument to -D is not an identifier\n");
539 snprintf(if_defined, sizeof if_defined,
540 "#ifdef %s\n", optarg);
541 snprintf(not_defined, sizeof not_defined,
542 "#ifndef %s\n", optarg);
543 snprintf(end_defined, sizeof end_defined,
544 "#endif /* %s */\n", optarg);
545 break;
546 case 'e':
547 diff_type = ED_DIFF;
548 break;
549 case 'E':
550 remove_empty_files = true;
551 break;
552 case 'f':
553 force = true;
554 break;
555 case 'F':
556 maxfuzz = atoi(optarg);
557 break;
558 case 'i':
559 if (++filec == MAXFILEC)
560 fatal("too many file arguments\n");
561 filearg[filec] = xstrdup(optarg);
562 break;
563 case 'l':
564 canonicalize = true;
565 break;
566 case 'n':
567 diff_type = NORMAL_DIFF;
568 break;
569 case 'N':
570 noreverse = true;
571 break;
572 case 'o':
573 outname = xstrdup(optarg);
574 break;
575 case 'p':
576 strippath = atoi(optarg);
577 break;
578 case 'r':
579 if (strlcpy(rejname, optarg,
580 sizeof(rejname)) >= sizeof(rejname))
581 fatal("argument for -r is too long\n");
582 break;
583 case 'R':
584 reverse = true;
585 reverse_flag_specified = true;
586 break;
587 case 's':
588 verbose = false;
589 break;
590 case 't':
591 batch = true;
592 break;
593 case 'u':
594 diff_type = UNI_DIFF;
595 break;
596 case 'v':
597 version();
598 break;
599 case 'V':
600 backup_type = get_version(optarg);
601 Vflag = true;
602 break;
603 #ifdef DEBUGGING
604 case 'x':
605 debug = atoi(optarg);
606 break;
607 #endif
608 default:
609 if (ch != '\0')
610 usage();
611 break;
612 }
613 }
614 Argc -= optind;
615 Argv += optind;
616
617 if (Argc > 0) {
618 filearg[0] = xstrdup(*Argv++);
619 Argc--;
620 while (Argc > 0) {
621 if (++filec == MAXFILEC)
622 fatal("too many file arguments\n");
623 filearg[filec] = xstrdup(*Argv++);
624 Argc--;
625 }
626 }
627
628 if (getenv("POSIXLY_CORRECT") != NULL)
629 posix = 1;
630 }
631
632 static void
usage(void)633 usage(void)
634 {
635 fprintf(stderr,
636 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n"
637 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n"
638 " [-r rej-name] [-V t | nil | never | none] [-x number]\n"
639 " [-z backup-ext] [--posix] [origfile [patchfile]]\n"
640 " patch <patchfile\n");
641 my_exit(EXIT_FAILURE);
642 }
643
644 /*
645 * Attempt to find the right place to apply this hunk of patch.
646 */
647 static LINENUM
locate_hunk(LINENUM fuzz)648 locate_hunk(LINENUM fuzz)
649 {
650 LINENUM first_guess = pch_first() + last_offset;
651 LINENUM offset;
652 LINENUM pat_lines = pch_ptrn_lines();
653 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1;
654 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context();
655
656 if (pat_lines == 0) { /* null range matches always */
657 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF
658 || diff_type == NEW_CONTEXT_DIFF
659 || diff_type == UNI_DIFF)) {
660 say("Empty context always matches.\n");
661 }
662 return (first_guess);
663 }
664 if (max_neg_offset >= first_guess) /* do not try lines < 0 */
665 max_neg_offset = first_guess - 1;
666 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz))
667 return first_guess;
668 for (offset = 1; ; offset++) {
669 bool check_after = (offset <= max_pos_offset);
670 bool check_before = (offset <= max_neg_offset);
671
672 if (check_after && patch_match(first_guess, offset, fuzz)) {
673 #ifdef DEBUGGING
674 if (debug & 1)
675 say("Offset changing from %ld to %ld\n",
676 last_offset, offset);
677 #endif
678 last_offset = offset;
679 return first_guess + offset;
680 } else if (check_before && patch_match(first_guess, -offset, fuzz)) {
681 #ifdef DEBUGGING
682 if (debug & 1)
683 say("Offset changing from %ld to %ld\n",
684 last_offset, -offset);
685 #endif
686 last_offset = -offset;
687 return first_guess - offset;
688 } else if (!check_before && !check_after)
689 return 0;
690 }
691 }
692
693 /* We did not find the pattern, dump out the hunk so they can handle it. */
694
695 static void
abort_context_hunk(void)696 abort_context_hunk(void)
697 {
698 LINENUM i;
699 const LINENUM pat_end = pch_end();
700 /*
701 * add in last_offset to guess the same as the previous successful
702 * hunk
703 */
704 const LINENUM oldfirst = pch_first() + last_offset;
705 const LINENUM newfirst = pch_newfirst() + last_offset;
706 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1;
707 const LINENUM newlast = newfirst + pch_repl_lines() - 1;
708 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : "");
709 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----");
710
711 fprintf(rejfp, "***************\n");
712 for (i = 0; i <= pat_end; i++) {
713 switch (pch_char(i)) {
714 case '*':
715 if (oldlast < oldfirst)
716 fprintf(rejfp, "*** 0%s\n", stars);
717 else if (oldlast == oldfirst)
718 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars);
719 else
720 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst,
721 oldlast, stars);
722 break;
723 case '=':
724 if (newlast < newfirst)
725 fprintf(rejfp, "--- 0%s\n", minuses);
726 else if (newlast == newfirst)
727 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses);
728 else
729 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst,
730 newlast, minuses);
731 break;
732 case '\n':
733 fprintf(rejfp, "%s", pfetch(i));
734 break;
735 case ' ':
736 case '-':
737 case '+':
738 case '!':
739 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i));
740 break;
741 default:
742 fatal("fatal internal error in abort_context_hunk\n");
743 }
744 }
745 }
746
747 static void
rej_line(int ch,LINENUM i)748 rej_line(int ch, LINENUM i)
749 {
750 size_t len;
751 const char *line = pfetch(i);
752
753 len = strlen(line);
754
755 fprintf(rejfp, "%c%s", ch, line);
756 if (len == 0 || line[len - 1] != '\n') {
757 if (len >= USHRT_MAX)
758 fprintf(rejfp, "\n\\ Line too long\n");
759 else
760 fprintf(rejfp, "\n\\ No newline at end of line\n");
761 }
762 }
763
764 static void
abort_hunk(void)765 abort_hunk(void)
766 {
767 LINENUM i, j, split;
768 int ch1, ch2;
769 const LINENUM pat_end = pch_end();
770 const LINENUM oldfirst = pch_first() + last_offset;
771 const LINENUM newfirst = pch_newfirst() + last_offset;
772
773 if (diff_type != UNI_DIFF) {
774 abort_context_hunk();
775 return;
776 }
777 split = -1;
778 for (i = 0; i <= pat_end; i++) {
779 if (pch_char(i) == '=') {
780 split = i;
781 break;
782 }
783 }
784 if (split == -1) {
785 fprintf(rejfp, "malformed hunk: no split found\n");
786 return;
787 }
788 i = 0;
789 j = split + 1;
790 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n",
791 pch_ptrn_lines() ? oldfirst : 0,
792 pch_ptrn_lines(), newfirst, pch_repl_lines());
793 while (i < split || j <= pat_end) {
794 ch1 = i < split ? pch_char(i) : -1;
795 ch2 = j <= pat_end ? pch_char(j) : -1;
796 if (ch1 == '-') {
797 rej_line('-', i);
798 i++;
799 } else if (ch1 == ' ' && ch2 == ' ') {
800 rej_line(' ', i);
801 i++;
802 j++;
803 } else if (ch1 == '!' && ch2 == '!') {
804 while (i < split && ch1 == '!') {
805 rej_line('-', i);
806 i++;
807 ch1 = i < split ? pch_char(i) : -1;
808 }
809 while (j <= pat_end && ch2 == '!') {
810 rej_line('+', j);
811 j++;
812 ch2 = j <= pat_end ? pch_char(j) : -1;
813 }
814 } else if (ch1 == '*') {
815 i++;
816 } else if (ch2 == '+' || ch2 == ' ') {
817 rej_line(ch2, j);
818 j++;
819 } else {
820 fprintf(rejfp, "internal error on (%ld %ld %ld)\n",
821 i, split, j);
822 rej_line(ch1, i);
823 rej_line(ch2, j);
824 return;
825 }
826 }
827 }
828
829 /* We found where to apply it (we hope), so do it. */
830
831 static void
apply_hunk(LINENUM where)832 apply_hunk(LINENUM where)
833 {
834 LINENUM old = 1;
835 const LINENUM lastline = pch_ptrn_lines();
836 LINENUM new = lastline + 1;
837 #define OUTSIDE 0
838 #define IN_IFNDEF 1
839 #define IN_IFDEF 2
840 #define IN_ELSE 3
841 int def_state = OUTSIDE;
842 const LINENUM pat_end = pch_end();
843
844 where--;
845 while (pch_char(new) == '=' || pch_char(new) == '\n')
846 new++;
847
848 while (old <= lastline) {
849 if (pch_char(old) == '-') {
850 copy_till(where + old - 1, false);
851 if (do_defines) {
852 if (def_state == OUTSIDE) {
853 fputs(not_defined, ofp);
854 def_state = IN_IFNDEF;
855 } else if (def_state == IN_IFDEF) {
856 fputs(else_defined, ofp);
857 def_state = IN_ELSE;
858 }
859 fputs(pfetch(old), ofp);
860 }
861 last_frozen_line++;
862 old++;
863 } else if (new > pat_end) {
864 break;
865 } else if (pch_char(new) == '+') {
866 copy_till(where + old - 1, false);
867 if (do_defines) {
868 if (def_state == IN_IFNDEF) {
869 fputs(else_defined, ofp);
870 def_state = IN_ELSE;
871 } else if (def_state == OUTSIDE) {
872 fputs(if_defined, ofp);
873 def_state = IN_IFDEF;
874 }
875 }
876 fputs(pfetch(new), ofp);
877 new++;
878 } else if (pch_char(new) != pch_char(old)) {
879 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n",
880 pch_hunk_beg() + old,
881 pch_hunk_beg() + new);
882 #ifdef DEBUGGING
883 say("oldchar = '%c', newchar = '%c'\n",
884 pch_char(old), pch_char(new));
885 #endif
886 my_exit(2);
887 } else if (pch_char(new) == '!') {
888 copy_till(where + old - 1, false);
889 if (do_defines) {
890 fputs(not_defined, ofp);
891 def_state = IN_IFNDEF;
892 }
893 while (pch_char(old) == '!') {
894 if (do_defines) {
895 fputs(pfetch(old), ofp);
896 }
897 last_frozen_line++;
898 old++;
899 }
900 if (do_defines) {
901 fputs(else_defined, ofp);
902 def_state = IN_ELSE;
903 }
904 while (pch_char(new) == '!') {
905 fputs(pfetch(new), ofp);
906 new++;
907 }
908 } else {
909 if (pch_char(new) != ' ')
910 fatal("Internal error: expected ' '\n");
911 old++;
912 new++;
913 if (do_defines && def_state != OUTSIDE) {
914 fputs(end_defined, ofp);
915 def_state = OUTSIDE;
916 }
917 }
918 }
919 if (new <= pat_end && pch_char(new) == '+') {
920 copy_till(where + old - 1, false);
921 if (do_defines) {
922 if (def_state == OUTSIDE) {
923 fputs(if_defined, ofp);
924 def_state = IN_IFDEF;
925 } else if (def_state == IN_IFNDEF) {
926 fputs(else_defined, ofp);
927 def_state = IN_ELSE;
928 }
929 }
930 while (new <= pat_end && pch_char(new) == '+') {
931 fputs(pfetch(new), ofp);
932 new++;
933 }
934 }
935 if (do_defines && def_state != OUTSIDE) {
936 fputs(end_defined, ofp);
937 }
938 }
939
940 /*
941 * Open the new file.
942 */
943 static void
init_output(const char * name)944 init_output(const char *name)
945 {
946 ofp = fopen(name, "w");
947 if (ofp == NULL)
948 pfatal("can't create %s", name);
949 }
950
951 /*
952 * Open a file to put hunks we can't locate.
953 */
954 static void
init_reject(const char * name)955 init_reject(const char *name)
956 {
957 rejfp = fopen(name, "w");
958 if (rejfp == NULL)
959 pfatal("can't create %s", name);
960 }
961
962 /*
963 * Copy input file to output, up to wherever hunk is to be applied.
964 * If endoffile is true, treat the last line specially since it may
965 * lack a newline.
966 */
967 static void
copy_till(LINENUM lastline,bool endoffile)968 copy_till(LINENUM lastline, bool endoffile)
969 {
970 if (last_frozen_line > lastline)
971 fatal("misordered hunks! output would be garbled\n");
972 while (last_frozen_line < lastline) {
973 if (++last_frozen_line == lastline && endoffile)
974 dump_line(last_frozen_line, !last_line_missing_eol);
975 else
976 dump_line(last_frozen_line, true);
977 }
978 }
979
980 /*
981 * Finish copying the input file to the output file.
982 */
983 static bool
spew_output(void)984 spew_output(void)
985 {
986 int rv;
987
988 #ifdef DEBUGGING
989 if (debug & 256)
990 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line);
991 #endif
992 if (input_lines)
993 copy_till(input_lines, true); /* dump remainder of file */
994 rv = ferror(ofp) == 0 && fclose(ofp) == 0;
995 ofp = NULL;
996 return rv;
997 }
998
999 /*
1000 * Copy one line from input to output.
1001 */
1002 static void
dump_line(LINENUM line,bool write_newline)1003 dump_line(LINENUM line, bool write_newline)
1004 {
1005 char *s;
1006
1007 s = ifetch(line, 0);
1008 if (s == NULL)
1009 return;
1010 /* Note: string is not NUL terminated. */
1011 for (; *s != '\n'; s++)
1012 putc(*s, ofp);
1013 if (write_newline)
1014 putc('\n', ofp);
1015 }
1016
1017 /*
1018 * Does the patch pattern match at line base+offset?
1019 */
1020 static bool
patch_match(LINENUM base,LINENUM offset,LINENUM fuzz)1021 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz)
1022 {
1023 LINENUM pline = 1 + fuzz;
1024 LINENUM iline;
1025 LINENUM pat_lines = pch_ptrn_lines() - fuzz;
1026 const char *ilineptr;
1027 const char *plineptr;
1028 unsigned short plinelen;
1029
1030 /* Patch does not match if we don't have any more context to use */
1031 if (pline > pat_lines)
1032 return false;
1033 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) {
1034 ilineptr = ifetch(iline, offset >= 0);
1035 if (ilineptr == NULL)
1036 return false;
1037 plineptr = pfetch(pline);
1038 plinelen = pch_line_len(pline);
1039 if (canonicalize) {
1040 if (!similar(ilineptr, plineptr, plinelen))
1041 return false;
1042 } else if (strnNE(ilineptr, plineptr, plinelen))
1043 return false;
1044 if (iline == input_lines) {
1045 /*
1046 * We are looking at the last line of the file.
1047 * If the file has no eol, the patch line should
1048 * not have one either and vice-versa. Note that
1049 * plinelen > 0.
1050 */
1051 if (last_line_missing_eol) {
1052 if (plineptr[plinelen - 1] == '\n')
1053 return false;
1054 } else {
1055 if (plineptr[plinelen - 1] != '\n')
1056 return false;
1057 }
1058 }
1059 }
1060 return true;
1061 }
1062
1063 /*
1064 * Do two lines match with canonicalized white space?
1065 */
1066 static bool
similar(const char * a,const char * b,int len)1067 similar(const char *a, const char *b, int len)
1068 {
1069 while (len) {
1070 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */
1071 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */
1072 return false;
1073 while (len && isspace((unsigned char)*b) && *b != '\n')
1074 b++, len--; /* skip pattern whitespace */
1075 while (isspace((unsigned char)*a) && *a != '\n')
1076 a++; /* skip target whitespace */
1077 if (*a == '\n' || *b == '\n')
1078 return (*a == *b); /* should end in sync */
1079 } else if (*a++ != *b++) /* match non-whitespace chars */
1080 return false;
1081 else
1082 len--; /* probably not necessary */
1083 }
1084 return true; /* actually, this is not reached */
1085 /* since there is always a \n */
1086 }
1087