1 /*
2 * $OpenBSD: patch.c,v 1.45 2007/04/18 21:52:24 sobrado Exp $
3 * $DragonFly: src/usr.bin/patch/patch.c,v 1.10 2008/08/10 23:39:56 joerg Exp $
4 * $NetBSD: patch.c,v 1.35 2024/07/12 15:48:39 manu Exp $
5 */
6
7 /*
8 * patch - a program to apply diffs to original files
9 *
10 * Copyright 1986, Larry Wall
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following condition is met:
14 * 1. Redistributions of source code must retain the above copyright notice,
15 * this condition and the following disclaimer.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * -C option added in 1998, original code by Marc Espie, based on FreeBSD
30 * behaviour
31 */
32
33 #include <sys/cdefs.h>
34 __RCSID("$NetBSD: patch.c,v 1.35 2024/07/12 15:48:39 manu Exp $");
35
36 #include <sys/types.h>
37 #include <sys/stat.h>
38
39 #include <ctype.h>
40 #include <getopt.h>
41 #include <limits.h>
42 #include <stdio.h>
43 #include <string.h>
44 #include <stdlib.h>
45 #include <unistd.h>
46
47 #include "common.h"
48 #include "util.h"
49 #include "pch.h"
50 #include "inp.h"
51 #include "backupfile.h"
52 #include "pathnames.h"
53
54 mode_t filemode = 0644;
55
56 char *buf; /* general purpose buffer */
57 size_t bufsz; /* general purpose buffer size */
58
59 bool using_plan_a = true; /* try to keep everything in memory */
60 bool out_of_mem = false; /* ran out of memory in plan a */
61
62 #define MAXFILEC 2
63
64 char *filearg[MAXFILEC];
65 bool ok_to_create_file = false;
66 char *outname = NULL;
67 char *origprae = NULL;
68 char *TMPOUTNAME;
69 char *TMPINNAME;
70 char *TMPREJNAME;
71 char *TMPPATNAME;
72 bool toutkeep = false;
73 bool trejkeep = false;
74 bool warn_on_invalid_line;
75 bool last_line_missing_eol;
76
77 #ifdef DEBUGGING
78 int debug = 0;
79 #endif
80
81 bool force = false;
82 bool batch = false;
83 bool verbose = true;
84 bool reverse = false;
85 bool noreverse = false;
86 bool skip_rest_of_patch = false;
87 int strippath = 957;
88 bool canonicalize = false;
89 bool check_only = false;
90 int diff_type = 0;
91 char *revision = NULL; /* prerequisite revision, if any */
92 LINENUM input_lines = 0; /* how long is input file in lines */
93 int posix = 0; /* strict POSIX mode? */
94 int backup_if_mismatch = -1;/* create backup file when patch doesn't apply cleanly */
95
96 static void reinitialize_almost_everything(void);
97 static void get_some_switches(void);
98 static LINENUM locate_hunk(LINENUM);
99 static void abort_context_hunk(void);
100 static void rej_line(int, LINENUM);
101 static void abort_hunk(void);
102 static void apply_hunk(LINENUM);
103 static void init_output(const char *);
104 static void init_reject(const char *);
105 static void copy_till(LINENUM, bool);
106 static bool spew_output(void);
107 static void dump_line(LINENUM, bool);
108 static bool patch_match(LINENUM, LINENUM, LINENUM);
109 static bool similar(const char *, const char *, ssize_t);
110 __dead static void usage(void);
111
112 /* true if -E was specified on command line. */
113 static bool remove_empty_files = false;
114
115 /* true if -R was specified on command line. */
116 static bool reverse_flag_specified = false;
117
118 /* buffer holding the name of the rejected patch file. */
119 static char rejname[PATH_MAX];
120
121 /* buffer for stderr */
122 static char serrbuf[BUFSIZ];
123
124 /* how many input lines have been irretractibly output */
125 static LINENUM last_frozen_line = 0;
126
127 static int Argc; /* guess */
128 static char **Argv;
129 static int Argc_last; /* for restarting plan_b */
130 static char **Argv_last;
131
132 static FILE *ofp = NULL; /* output file pointer */
133 static FILE *rejfp = NULL; /* reject file pointer */
134
135 static int filec = 0; /* how many file arguments? */
136 static LINENUM last_offset = 0;
137 static LINENUM maxfuzz = 2;
138
139 /* patch using ifdef, ifndef, etc. */
140 static bool do_defines = false;
141 /* #ifdef xyzzy */
142 static char if_defined[128];
143 /* #ifndef xyzzy */
144 static char not_defined[128];
145 /* #else */
146 static const char else_defined[] = "#else\n";
147 /* #endif xyzzy */
148 static char end_defined[128];
149
150
151 /* Apply a set of diffs as appropriate. */
152
153 int
main(int argc,char * argv[])154 main(int argc, char *argv[])
155 {
156 int error = 0, hunk, failed, i, fd;
157 LINENUM where = 0, newwhere, fuzz, mymaxfuzz;
158 const char *tmpdir;
159 char *v;
160
161 bufsz = INITLINELEN;
162 if ((buf = malloc(bufsz)) == NULL)
163 pfatal("allocating input buffer");
164 buf[0] = '\0';
165
166 setbuf(stderr, serrbuf);
167 for (i = 0; i < MAXFILEC; i++)
168 filearg[i] = NULL;
169
170 /* Cons up the names of the temporary files. */
171 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0')
172 tmpdir = _PATH_TMP;
173 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--)
174 ;
175 i++;
176 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1)
177 fatal("cannot allocate memory");
178 if ((fd = mkstemp(TMPOUTNAME)) < 0)
179 pfatal("can't create %s", TMPOUTNAME);
180 close(fd);
181
182 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1)
183 fatal("cannot allocate memory");
184 if ((fd = mkstemp(TMPINNAME)) < 0)
185 pfatal("can't create %s", TMPINNAME);
186 close(fd);
187
188 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1)
189 fatal("cannot allocate memory");
190 if ((fd = mkstemp(TMPREJNAME)) < 0)
191 pfatal("can't create %s", TMPREJNAME);
192 close(fd);
193
194 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1)
195 fatal("cannot allocate memory");
196 if ((fd = mkstemp(TMPPATNAME)) < 0)
197 pfatal("can't create %s", TMPPATNAME);
198 close(fd);
199
200 v = getenv("SIMPLE_BACKUP_SUFFIX");
201 if (v)
202 simple_backup_suffix = v;
203 else
204 simple_backup_suffix = ORIGEXT;
205
206 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL)
207 v = getenv("VERSION_CONTROL");
208 if (v != NULL)
209 backup_type = get_version(v);
210
211 /* parse switches */
212 Argc = argc;
213 Argv = argv;
214 get_some_switches();
215
216 if (backup_type == undefined)
217 backup_type = posix ? none : numbered_existing;
218
219 /* make sure we clean up /tmp in case of disaster */
220 set_signals(0);
221
222 for (open_patch_file(filearg[1]); there_is_another_patch();
223 reinitialize_almost_everything()) {
224 /* for each patch in patch file */
225
226 warn_on_invalid_line = true;
227
228 if (outname == NULL)
229 outname = savestr(filearg[0]);
230
231 /* for ed script just up and do it and exit */
232 if (diff_type == ED_DIFF) {
233 do_ed_script();
234 continue;
235 }
236 /* initialize the patched file */
237 if (!skip_rest_of_patch)
238 init_output(TMPOUTNAME);
239
240 /* initialize reject file */
241 init_reject(TMPREJNAME);
242
243 /* find out where all the lines are */
244 if (!skip_rest_of_patch)
245 scan_input(filearg[0]);
246
247 /* from here on, open no standard i/o files, because malloc */
248 /* might misfire and we can't catch it easily */
249
250 /* apply each hunk of patch */
251 hunk = 0;
252 failed = 0;
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) {
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 %spreviously applied) patch detected! %s -R.",
289 reverse ? "R" : "Unr",
290 reverse ? "" : "not ",
291 reverse ? "Assuming" : "Ignoring");
292 } else {
293 ask("%seversed (or %spreviously applied) patch detected! %s -R? [y] ",
294 reverse ? "R" : "Unr",
295 reverse ? "" : "not ",
296 reverse ? "Assume" : "Ignore");
297 if (*buf == 'n') {
298 ask("Apply anyway? [n] ");
299 if (*buf != 'y')
300 skip_rest_of_patch = 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 /* handle --backup-if-mismatch */
379 enum backup_type saved = backup_type;
380 if (failed > 0 && backup_if_mismatch > 0 && backup_type == none)
381 backup_type = simple;
382 if (move_file(TMPOUTNAME, outname) < 0) {
383 toutkeep = true;
384 realout = TMPOUTNAME;
385 chmod(TMPOUTNAME, filemode);
386 } else
387 chmod(outname, filemode);
388 backup_type = saved;
389
390 if (remove_empty_files &&
391 stat(realout, &statbuf) == 0 &&
392 statbuf.st_size == 0) {
393 if (verbose)
394 say("Removing %s (empty after patching).\n",
395 realout);
396 unlink(realout);
397 }
398 }
399 }
400 if (ferror(rejfp) || fclose(rejfp)) {
401 say("Error writing %s\n", rejname);
402 error = 1;
403 }
404 rejfp = NULL;
405 if (failed) {
406 error = 1;
407 if (*rejname == '\0') {
408 if (strlcpy(rejname, outname,
409 sizeof(rejname)) >= sizeof(rejname))
410 fatal("filename %s is too long\n", outname);
411 if (strlcat(rejname, REJEXT,
412 sizeof(rejname)) >= sizeof(rejname))
413 fatal("filename %s is too long\n", outname);
414 }
415 if (skip_rest_of_patch) {
416 say("%d out of %d hunks ignored--saving rejects to %s\n",
417 failed, hunk, rejname);
418 } else {
419 say("%d out of %d hunks FAILED -- saving rejects to %s\n",
420 failed, hunk, rejname);
421 }
422 if (!check_only && move_file(TMPREJNAME, rejname) < 0)
423 trejkeep = true;
424 }
425 set_signals(1);
426 }
427 my_exit(error);
428 /* NOTREACHED */
429 }
430
431 /* Prepare to find the next patch to do in the patch file. */
432
433 static void
reinitialize_almost_everything(void)434 reinitialize_almost_everything(void)
435 {
436 re_patch();
437 re_input();
438
439 input_lines = 0;
440 last_frozen_line = 0;
441
442 filec = 0;
443 if (!out_of_mem) {
444 free(filearg[0]);
445 filearg[0] = NULL;
446 }
447
448 free(outname);
449 outname = NULL;
450
451 last_offset = 0;
452 diff_type = 0;
453
454 free(revision);
455 revision = NULL;
456
457 reverse = reverse_flag_specified;
458 skip_rest_of_patch = false;
459
460 get_some_switches();
461 }
462
463 /* Process switches and filenames. */
464
465 static void
get_some_switches(void)466 get_some_switches(void)
467 {
468 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:";
469 static struct option longopts[] = {
470 {"backup", no_argument, 0, 'b'},
471 {"backup-if-mismatch", no_argument, &backup_if_mismatch, 1},
472 {"batch", no_argument, 0, 't'},
473 {"check", no_argument, 0, 'C'},
474 {"context", no_argument, 0, 'c'},
475 {"debug", required_argument, 0, 'x'},
476 {"directory", required_argument, 0, 'd'},
477 {"ed", no_argument, 0, 'e'},
478 {"force", no_argument, 0, 'f'},
479 {"forward", no_argument, 0, 'N'},
480 {"fuzz", required_argument, 0, 'F'},
481 {"ifdef", required_argument, 0, 'D'},
482 {"input", required_argument, 0, 'i'},
483 {"ignore-whitespace", no_argument, 0, 'l'},
484 {"no-backup-if-mismatch", no_argument, &backup_if_mismatch, 0},
485 {"normal", no_argument, 0, 'n'},
486 {"output", required_argument, 0, 'o'},
487 {"prefix", required_argument, 0, 'B'},
488 {"quiet", no_argument, 0, 's'},
489 {"reject-file", required_argument, 0, 'r'},
490 {"remove-empty-files", no_argument, 0, 'E'},
491 {"reverse", no_argument, 0, 'R'},
492 {"silent", no_argument, 0, 's'},
493 {"strip", required_argument, 0, 'p'},
494 {"suffix", required_argument, 0, 'z'},
495 {"unified", no_argument, 0, 'u'},
496 {"version", no_argument, 0, 'v'},
497 {"version-control", required_argument, 0, 'V'},
498 {"posix", no_argument, &posix, 1},
499 {NULL, 0, 0, 0}
500 };
501 int ch;
502
503 rejname[0] = '\0';
504 Argc_last = Argc;
505 Argv_last = Argv;
506 if (!Argc)
507 return;
508 optreset = optind = 1;
509 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) {
510 switch (ch) {
511 case 'b':
512 if (backup_type == undefined)
513 backup_type = numbered_existing;
514 if (optarg == NULL)
515 break;
516 if (verbose)
517 say("Warning, the ``-b suffix'' option has been"
518 " obsoleted by the -z option.\n");
519 /* FALLTHROUGH */
520 case 'z':
521 /* must directly follow 'b' case for backwards compat */
522 simple_backup_suffix = savestr(optarg);
523 break;
524 case 'B':
525 origprae = savestr(optarg);
526 break;
527 case 'c':
528 diff_type = CONTEXT_DIFF;
529 break;
530 case 'C':
531 check_only = true;
532 break;
533 case 'd':
534 if (chdir(optarg) < 0)
535 pfatal("can't cd to %s", optarg);
536 break;
537 case 'D':
538 do_defines = true;
539 if (!isalpha((unsigned char)*optarg) && *optarg != '_')
540 fatal("argument to -D is not an identifier\n");
541 snprintf(if_defined, sizeof if_defined,
542 "#ifdef %s\n", optarg);
543 snprintf(not_defined, sizeof not_defined,
544 "#ifndef %s\n", optarg);
545 snprintf(end_defined, sizeof end_defined,
546 "#endif /* %s */\n", optarg);
547 break;
548 case 'e':
549 diff_type = ED_DIFF;
550 break;
551 case 'E':
552 remove_empty_files = true;
553 break;
554 case 'f':
555 force = true;
556 break;
557 case 'F':
558 maxfuzz = atoi(optarg);
559 break;
560 case 'i':
561 if (++filec == MAXFILEC)
562 fatal("too many file arguments\n");
563 filearg[filec] = savestr(optarg);
564 break;
565 case 'l':
566 canonicalize = true;
567 break;
568 case 'n':
569 diff_type = NORMAL_DIFF;
570 break;
571 case 'N':
572 noreverse = true;
573 break;
574 case 'o':
575 outname = savestr(optarg);
576 break;
577 case 'p':
578 strippath = atoi(optarg);
579 break;
580 case 'r':
581 if (strlcpy(rejname, optarg,
582 sizeof(rejname)) >= sizeof(rejname))
583 fatal("argument for -r is too long\n");
584 break;
585 case 'R':
586 reverse = true;
587 reverse_flag_specified = true;
588 break;
589 case 's':
590 verbose = false;
591 break;
592 case 't':
593 batch = true;
594 break;
595 case 'u':
596 diff_type = UNI_DIFF;
597 break;
598 case 'v':
599 version();
600 break;
601 case 'V':
602 backup_type = get_version(optarg);
603 break;
604 #ifdef DEBUGGING
605 case 'x':
606 debug = atoi(optarg);
607 break;
608 #endif
609 default:
610 if (ch != '\0')
611 usage();
612 break;
613 }
614 }
615 Argc -= optind;
616 Argv += optind;
617
618 if (Argc > 0) {
619 filearg[0] = savestr(*Argv++);
620 Argc--;
621 while (Argc > 0) {
622 if (++filec == MAXFILEC)
623 fatal("too many file arguments\n");
624 filearg[filec] = savestr(*Argv++);
625 Argc--;
626 }
627 }
628
629 if (getenv("POSIXLY_CORRECT") != NULL)
630 posix = 1;
631
632 if (backup_if_mismatch == -1) {
633 backup_if_mismatch = posix ? 0 : 1;
634 }
635 }
636
637 static void
usage(void)638 usage(void)
639 {
640 fprintf(stderr,
641 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n"
642 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n"
643 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n"
644 " [--backup-if-mismatch] [--no-backup-if-mismatch] [--posix]\n"
645 " [origfile [patchfile]]\n"
646 " patch <patchfile\n");
647 my_exit(EXIT_FAILURE);
648 }
649
650 /*
651 * Attempt to find the right place to apply this hunk of patch.
652 */
653 static LINENUM
locate_hunk(LINENUM fuzz)654 locate_hunk(LINENUM fuzz)
655 {
656 LINENUM first_guess = pch_first() + last_offset;
657 LINENUM offset;
658 LINENUM pat_lines = pch_ptrn_lines();
659 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1;
660 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context();
661
662 if (pat_lines == 0) { /* null range matches always */
663 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF
664 || diff_type == NEW_CONTEXT_DIFF
665 || diff_type == UNI_DIFF)) {
666 say("Empty context always matches.\n");
667 }
668 return (first_guess);
669 }
670 if (max_neg_offset >= first_guess) /* do not try lines < 0 */
671 max_neg_offset = first_guess - 1;
672 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz))
673 return first_guess;
674 for (offset = 1; ; offset++) {
675 bool check_after = (offset <= max_pos_offset);
676 bool check_before = (offset <= max_neg_offset);
677
678 if (check_after && patch_match(first_guess, offset, fuzz)) {
679 #ifdef DEBUGGING
680 if (debug & 1)
681 say("Offset changing from %ld to %ld\n",
682 last_offset, offset);
683 #endif
684 last_offset = offset;
685 return first_guess + offset;
686 } else if (check_before && patch_match(first_guess, -offset, fuzz)) {
687 #ifdef DEBUGGING
688 if (debug & 1)
689 say("Offset changing from %ld to %ld\n",
690 last_offset, -offset);
691 #endif
692 last_offset = -offset;
693 return first_guess - offset;
694 } else if (!check_before && !check_after)
695 return 0;
696 }
697 }
698
699 /* We did not find the pattern, dump out the hunk so they can handle it. */
700
701 static void
abort_context_hunk(void)702 abort_context_hunk(void)
703 {
704 LINENUM i;
705 const LINENUM pat_end = pch_end();
706 /*
707 * add in last_offset to guess the same as the previous successful
708 * hunk
709 */
710 const LINENUM oldfirst = pch_first() + last_offset;
711 const LINENUM newfirst = pch_newfirst() + last_offset;
712 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1;
713 const LINENUM newlast = newfirst + pch_repl_lines() - 1;
714 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : "");
715 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----");
716
717 fprintf(rejfp, "***************\n");
718 for (i = 0; i <= pat_end; i++) {
719 switch (pch_char(i)) {
720 case '*':
721 if (oldlast < oldfirst)
722 fprintf(rejfp, "*** 0%s\n", stars);
723 else if (oldlast == oldfirst)
724 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars);
725 else
726 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst,
727 oldlast, stars);
728 break;
729 case '=':
730 if (newlast < newfirst)
731 fprintf(rejfp, "--- 0%s\n", minuses);
732 else if (newlast == newfirst)
733 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses);
734 else
735 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst,
736 newlast, minuses);
737 break;
738 case '\n':
739 fprintf(rejfp, "%s", pfetch(i));
740 break;
741 case ' ':
742 case '-':
743 case '+':
744 case '!':
745 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i));
746 break;
747 default:
748 fatal("fatal internal error in abort_context_hunk\n");
749 }
750 }
751 }
752
753 static void
rej_line(int ch,LINENUM i)754 rej_line(int ch, LINENUM i)
755 {
756 size_t len;
757 const char *line = pfetch(i);
758
759 len = strlen(line);
760
761 fprintf(rejfp, "%c%s", ch, line);
762 if (len == 0 || line[len-1] != '\n')
763 fprintf(rejfp, "\n\\ No newline at end of file\n");
764 }
765
766 static void
abort_hunk(void)767 abort_hunk(void)
768 {
769 LINENUM i, j, split;
770 int ch1, ch2;
771 const LINENUM pat_end = pch_end();
772 const LINENUM oldfirst = pch_first() + last_offset;
773 const LINENUM newfirst = pch_newfirst() + last_offset;
774
775 if (diff_type != UNI_DIFF) {
776 abort_context_hunk();
777 return;
778 }
779 split = -1;
780 for (i = 0; i <= pat_end; i++) {
781 if (pch_char(i) == '=') {
782 split = i;
783 break;
784 }
785 }
786 if (split == -1) {
787 fprintf(rejfp, "malformed hunk: no split found\n");
788 return;
789 }
790 i = 0;
791 j = split + 1;
792 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n",
793 pch_ptrn_lines() ? oldfirst : 0,
794 pch_ptrn_lines(), newfirst, pch_repl_lines());
795 while (i < split || j <= pat_end) {
796 ch1 = i < split ? pch_char(i) : -1;
797 ch2 = j <= pat_end ? pch_char(j) : -1;
798 if (ch1 == '-') {
799 rej_line('-', i);
800 i++;
801 } else if (ch1 == ' ' && ch2 == ' ') {
802 rej_line(' ', i);
803 i++;
804 j++;
805 } else if (ch1 == '!' && ch2 == '!') {
806 while (i < split && ch1 == '!') {
807 rej_line('-', i);
808 i++;
809 ch1 = i < split ? pch_char(i) : -1;
810 }
811 while (j <= pat_end && ch2 == '!') {
812 rej_line('+', j);
813 j++;
814 ch2 = j <= pat_end ? pch_char(j) : -1;
815 }
816 } else if (ch1 == '*') {
817 i++;
818 } else if (ch2 == '+' || ch2 == ' ') {
819 rej_line(ch2, j);
820 j++;
821 } else {
822 fprintf(rejfp, "internal error on (%ld %ld %ld)\n",
823 i, split, j);
824 rej_line(ch1, i);
825 rej_line(ch2, j);
826 return;
827 }
828 }
829 }
830
831 /* We found where to apply it (we hope), so do it. */
832
833 static void
apply_hunk(LINENUM where)834 apply_hunk(LINENUM where)
835 {
836 LINENUM old = 1;
837 const LINENUM lastline = pch_ptrn_lines();
838 LINENUM new = lastline + 1;
839 #define OUTSIDE 0
840 #define IN_IFNDEF 1
841 #define IN_IFDEF 2
842 #define IN_ELSE 3
843 int def_state = OUTSIDE;
844 const LINENUM pat_end = pch_end();
845
846 where--;
847 while (pch_char(new) == '=' || pch_char(new) == '\n')
848 new++;
849
850 while (old <= lastline) {
851 if (pch_char(old) == '-') {
852 copy_till(where + old - 1, false);
853 if (do_defines) {
854 if (def_state == OUTSIDE) {
855 fputs(not_defined, ofp);
856 def_state = IN_IFNDEF;
857 } else if (def_state == IN_IFDEF) {
858 fputs(else_defined, ofp);
859 def_state = IN_ELSE;
860 }
861 fputs(pfetch(old), ofp);
862 }
863 last_frozen_line++;
864 old++;
865 } else if (new > pat_end) {
866 break;
867 } else if (pch_char(new) == '+') {
868 copy_till(where + old - 1, false);
869 if (do_defines) {
870 if (def_state == IN_IFNDEF) {
871 fputs(else_defined, ofp);
872 def_state = IN_ELSE;
873 } else if (def_state == OUTSIDE) {
874 fputs(if_defined, ofp);
875 def_state = IN_IFDEF;
876 }
877 }
878 fputs(pfetch(new), ofp);
879 new++;
880 } else if (pch_char(new) != pch_char(old)) {
881 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n",
882 pch_hunk_beg() + old,
883 pch_hunk_beg() + new);
884 #ifdef DEBUGGING
885 say("oldchar = '%c', newchar = '%c'\n",
886 pch_char(old), pch_char(new));
887 #endif
888 my_exit(2);
889 } else if (pch_char(new) == '!') {
890 copy_till(where + old - 1, false);
891 if (do_defines) {
892 fputs(not_defined, ofp);
893 def_state = IN_IFNDEF;
894 }
895 while (pch_char(old) == '!') {
896 if (do_defines) {
897 fputs(pfetch(old), ofp);
898 }
899 last_frozen_line++;
900 old++;
901 }
902 if (do_defines) {
903 fputs(else_defined, ofp);
904 def_state = IN_ELSE;
905 }
906 while (pch_char(new) == '!') {
907 fputs(pfetch(new), ofp);
908 new++;
909 }
910 } else {
911 if (pch_char(new) != ' ')
912 fatal("Internal error: expected ' '\n");
913 old++;
914 new++;
915 if (do_defines && def_state != OUTSIDE) {
916 fputs(end_defined, ofp);
917 def_state = OUTSIDE;
918 }
919 }
920 }
921 if (new <= pat_end && pch_char(new) == '+') {
922 copy_till(where + old - 1, false);
923 if (do_defines) {
924 if (def_state == OUTSIDE) {
925 fputs(if_defined, ofp);
926 def_state = IN_IFDEF;
927 } else if (def_state == IN_IFNDEF) {
928 fputs(else_defined, ofp);
929 def_state = IN_ELSE;
930 }
931 }
932 while (new <= pat_end && pch_char(new) == '+') {
933 fputs(pfetch(new), ofp);
934 new++;
935 }
936 }
937 if (do_defines && def_state != OUTSIDE) {
938 fputs(end_defined, ofp);
939 }
940 }
941
942 /*
943 * Open the new file.
944 */
945 static void
init_output(const char * name)946 init_output(const char *name)
947 {
948 ofp = fopen(name, "w");
949 if (ofp == NULL)
950 pfatal("can't create %s", name);
951 }
952
953 /*
954 * Open a file to put hunks we can't locate.
955 */
956 static void
init_reject(const char * name)957 init_reject(const char *name)
958 {
959 rejfp = fopen(name, "w");
960 if (rejfp == NULL)
961 pfatal("can't create %s", name);
962 }
963
964 /*
965 * Copy input file to output, up to wherever hunk is to be applied.
966 * If endoffile is true, treat the last line specially since it may
967 * lack a newline.
968 */
969 static void
copy_till(LINENUM lastline,bool endoffile)970 copy_till(LINENUM lastline, bool endoffile)
971 {
972 if (last_frozen_line > lastline)
973 fatal("misordered hunks! output would be garbled\n");
974 while (last_frozen_line < lastline) {
975 if (++last_frozen_line == lastline && endoffile)
976 dump_line(last_frozen_line, !last_line_missing_eol);
977 else
978 dump_line(last_frozen_line, true);
979 }
980 }
981
982 /*
983 * Finish copying the input file to the output file.
984 */
985 static bool
spew_output(void)986 spew_output(void)
987 {
988 int rv;
989
990 #ifdef DEBUGGING
991 if (debug & 256)
992 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line);
993 #endif
994 if (input_lines)
995 copy_till(input_lines, true); /* dump remainder of file */
996 rv = ferror(ofp) == 0 && fclose(ofp) == 0;
997 ofp = NULL;
998 return rv;
999 }
1000
1001 /*
1002 * Copy one line from input to output.
1003 */
1004 static void
dump_line(LINENUM line,bool write_newline)1005 dump_line(LINENUM line, bool write_newline)
1006 {
1007 char *s;
1008
1009 s = ifetch(line, 0);
1010 if (s == NULL)
1011 return;
1012 /* Note: string is not NUL terminated. */
1013 for (; *s != '\n'; s++)
1014 putc(*s, ofp);
1015 if (write_newline)
1016 putc('\n', ofp);
1017 }
1018
1019 /*
1020 * Does the patch pattern match at line base+offset?
1021 */
1022 static bool
patch_match(LINENUM base,LINENUM offset,LINENUM fuzz)1023 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz)
1024 {
1025 LINENUM pline = 1 + fuzz;
1026 LINENUM iline;
1027 LINENUM pat_lines = pch_ptrn_lines() - fuzz;
1028 const char *ilineptr;
1029 const char *plineptr;
1030 ssize_t plinelen;
1031
1032 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) {
1033 ilineptr = ifetch(iline, offset >= 0);
1034 if (ilineptr == NULL)
1035 return false;
1036 plineptr = pfetch(pline);
1037 plinelen = pch_line_len(pline);
1038 if (canonicalize) {
1039 if (!similar(ilineptr, plineptr, plinelen))
1040 return false;
1041 } else if (strnNE(ilineptr, plineptr, plinelen))
1042 return false;
1043 if (iline == input_lines) {
1044 /*
1045 * We are looking at the last line of the file.
1046 * If the file has no eol, the patch line should
1047 * not have one either and vice-versa. Note that
1048 * plinelen > 0.
1049 */
1050 if (last_line_missing_eol) {
1051 if (plineptr[plinelen - 1] == '\n')
1052 return false;
1053 } else {
1054 if (plineptr[plinelen - 1] != '\n')
1055 return false;
1056 }
1057 }
1058 }
1059 return true;
1060 }
1061
1062 /*
1063 * Do two lines match with canonicalized white space?
1064 */
1065 static bool
similar(const char * a,const char * b,ssize_t len)1066 similar(const char *a, const char *b, ssize_t len)
1067 {
1068 while (len) {
1069 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */
1070 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */
1071 return false;
1072 while (len && isspace((unsigned char)*b) && *b != '\n')
1073 b++, len--; /* skip pattern whitespace */
1074 while (isspace((unsigned char)*a) && *a != '\n')
1075 a++; /* skip target whitespace */
1076 if (*a == '\n' || *b == '\n')
1077 return (*a == *b); /* should end in sync */
1078 } else if (*a++ != *b++) /* match non-whitespace chars */
1079 return false;
1080 else
1081 len--; /* probably not necessary */
1082 }
1083 return true; /* actually, this is not reached */
1084 /* since there is always a \n */
1085 }
1086