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