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Sync with manuals from netbsd-8 branch.
[minix3.git] / usr.bin / patch / patch.c
blob9f49e7f96e1657d8a8a486bea9e5b5e7b63c6f7a
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 1.29 2011/09/06 18:25:14 joerg 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 1.29 2011/09/06 18:25:14 joerg 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[MAXLINELEN]; /* general purpose buffer */
57 size_t buf_len = sizeof(buf);
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
95 static void reinitialize_almost_everything(void);
96 static void get_some_switches(void);
97 static LINENUM locate_hunk(LINENUM);
98 static void abort_context_hunk(void);
99 static void rej_line(int, LINENUM);
100 static void abort_hunk(void);
101 static void apply_hunk(LINENUM);
102 static void init_output(const char *);
103 static void init_reject(const char *);
104 static void copy_till(LINENUM, bool);
105 static bool spew_output(void);
106 static void dump_line(LINENUM, bool);
107 static bool patch_match(LINENUM, LINENUM, LINENUM);
108 static bool similar(const char *, const char *, int);
109 __dead static void usage(void);
110
111 /* true if -E was specified on command line. */
112 static bool remove_empty_files = false;
113
114 /* true if -R was specified on command line. */
115 static bool reverse_flag_specified = false;
116
117 /* buffer holding the name of the rejected patch file. */
118 static char rejname[NAME_MAX + 1];
119
120 /* buffer for stderr */
121 static char serrbuf[BUFSIZ];
122
123 /* how many input lines have been irretractibly output */
124 static LINENUM last_frozen_line = 0;
125
126 static int Argc; /* guess */
127 static char **Argv;
128 static int Argc_last; /* for restarting plan_b */
129 static char **Argv_last;
130
131 static FILE *ofp = NULL; /* output file pointer */
132 static FILE *rejfp = NULL; /* reject file pointer */
133
134 static int filec = 0; /* how many file arguments? */
135 static LINENUM last_offset = 0;
136 static LINENUM maxfuzz = 2;
137
138 /* patch using ifdef, ifndef, etc. */
139 static bool do_defines = false;
140 /* #ifdef xyzzy */
141 static char if_defined[128];
142 /* #ifndef xyzzy */
143 static char not_defined[128];
144 /* #else */
145 static const char else_defined[] = "#else\n";
146 /* #endif xyzzy */
147 static char end_defined[128];
148
149
150 /* Apply a set of diffs as appropriate. */
151
152 int
153 main(int argc, char *argv[])
154 {
155 int error = 0, hunk, failed, i, fd;
156 LINENUM where = 0, newwhere, fuzz, mymaxfuzz;
157 const char *tmpdir;
158 char *v;
159
160 setbuf(stderr, serrbuf);
161 for (i = 0; i < MAXFILEC; i++)
162 filearg[i] = NULL;
163
164 /* Cons up the names of the temporary files. */
165 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0')
166 tmpdir = _PATH_TMP;
167 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--)
168 ;
169 i++;
170 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1)
171 fatal("cannot allocate memory");
172 if ((fd = mkstemp(TMPOUTNAME)) < 0)
173 pfatal("can't create %s", TMPOUTNAME);
174 close(fd);
175
176 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1)
177 fatal("cannot allocate memory");
178 if ((fd = mkstemp(TMPINNAME)) < 0)
179 pfatal("can't create %s", TMPINNAME);
180 close(fd);
181
182 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1)
183 fatal("cannot allocate memory");
184 if ((fd = mkstemp(TMPREJNAME)) < 0)
185 pfatal("can't create %s", TMPREJNAME);
186 close(fd);
187
188 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1)
189 fatal("cannot allocate memory");
190 if ((fd = mkstemp(TMPPATNAME)) < 0)
191 pfatal("can't create %s", TMPPATNAME);
192 close(fd);
193
194 v = getenv("SIMPLE_BACKUP_SUFFIX");
195 if (v)
196 simple_backup_suffix = v;
197 else
198 simple_backup_suffix = ORIGEXT;
199
200 /* parse switches */
201 Argc = argc;
202 Argv = argv;
203 get_some_switches();
204
205 if (backup_type == none) {
206 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL)
207 v = getenv("VERSION_CONTROL");
208 if (v != NULL || !posix)
209 backup_type = get_version(v); /* OK to pass NULL. */
210 }
211
212 /* make sure we clean up /tmp in case of disaster */
213 set_signals(0);
214
215 for (open_patch_file(filearg[1]); there_is_another_patch();
216 reinitialize_almost_everything()) {
217 /* for each patch in patch file */
218
219 warn_on_invalid_line = true;
220
221 if (outname == NULL)
222 outname = savestr(filearg[0]);
223
224 /* for ed script just up and do it and exit */
225 if (diff_type == ED_DIFF) {
226 do_ed_script();
227 continue;
228 }
229 /* initialize the patched file */
230 if (!skip_rest_of_patch)
231 init_output(TMPOUTNAME);
232
233 /* initialize reject file */
234 init_reject(TMPREJNAME);
235
236 /* find out where all the lines are */
237 if (!skip_rest_of_patch)
238 scan_input(filearg[0]);
239
240 /* from here on, open no standard i/o files, because malloc */
241 /* might misfire and we can't catch it easily */
242
243 /* apply each hunk of patch */
244 hunk = 0;
245 failed = 0;
246 out_of_mem = false;
247 while (another_hunk()) {
248 hunk++;
249 fuzz = 0;
250 mymaxfuzz = pch_context();
251 if (maxfuzz < mymaxfuzz)
252 mymaxfuzz = maxfuzz;
253 if (!skip_rest_of_patch) {
254 do {
255 where = locate_hunk(fuzz);
256 if (hunk == 1 && where == 0 && !force) {
257 /* dwim for reversed patch? */
258 if (!pch_swap()) {
259 if (fuzz == 0)
260 say("Not enough memory to try swapped hunk! Assuming unswapped.\n");
261 continue;
262 }
263 reverse = !reverse;
264 /* try again */
265 where = locate_hunk(fuzz);
266 if (where == 0) {
267 /* didn't find it swapped */
268 if (!pch_swap())
269 /* put it back to normal */
270 fatal("lost hunk on alloc error!\n");
271 reverse = !reverse;
272 } else if (noreverse) {
273 if (!pch_swap())
274 /* put it back to normal */
275 fatal("lost hunk on alloc error!\n");
276 reverse = !reverse;
277 say("Ignoring previously applied (or reversed) patch.\n");
278 skip_rest_of_patch = true;
279 } else if (batch) {
280 if (verbose)
281 say("%seversed (or previously applied) patch detected! %s -R.",
282 reverse ? "R" : "Unr",
283 reverse ? "Assuming" : "Ignoring");
284 } else {
285 ask("%seversed (or previously applied) patch detected! %s -R? [y] ",
286 reverse ? "R" : "Unr",
287 reverse ? "Assume" : "Ignore");
288 if (*buf == 'n') {
289 ask("Apply anyway? [n] ");
290 if (*buf != 'y')
291 skip_rest_of_patch = true;
292 where = 0;
293 reverse = !reverse;
294 if (!pch_swap())
295 /* put it back to normal */
296 fatal("lost hunk on alloc error!\n");
297 }
298 }
299 }
300 } while (!skip_rest_of_patch && where == 0 &&
301 ++fuzz <= mymaxfuzz);
302
303 if (skip_rest_of_patch) { /* just got decided */
304 if (ferror(ofp) || fclose(ofp)) {
305 say("Error writing %s\n",
306 TMPOUTNAME);
307 error = 1;
308 }
309 ofp = NULL;
310 }
311 }
312 newwhere = pch_newfirst() + last_offset;
313 if (skip_rest_of_patch) {
314 abort_hunk();
315 failed++;
316 if (verbose)
317 say("Hunk #%d ignored at %ld.\n",
318 hunk, newwhere);
319 } else if (where == 0) {
320 abort_hunk();
321 failed++;
322 if (verbose)
323 say("Hunk #%d failed at %ld.\n",
324 hunk, newwhere);
325 } else {
326 apply_hunk(where);
327 if (verbose) {
328 say("Hunk #%d succeeded at %ld",
329 hunk, newwhere);
330 if (fuzz != 0)
331 say(" with fuzz %ld", fuzz);
332 if (last_offset)
333 say(" (offset %ld line%s)",
334 last_offset,
335 last_offset == 1L ? "" : "s");
336 say(".\n");
337 }
338 }
339 }
340
341 if (out_of_mem && using_plan_a) {
342 Argc = Argc_last;
343 Argv = Argv_last;
344 say("\n\nRan out of memory using Plan A--trying again...\n\n");
345 if (ofp)
346 fclose(ofp);
347 ofp = NULL;
348 if (rejfp)
349 fclose(rejfp);
350 rejfp = NULL;
351 continue;
352 }
353 if (hunk == 0)
354 fatal("Internal error: hunk should not be 0\n");
355
356 /* finish spewing out the new file */
357 if (!skip_rest_of_patch && !spew_output()) {
358 say("Can't write %s\n", TMPOUTNAME);
359 error = 1;
360 }
361
362 /* and put the output where desired */
363 ignore_signals();
364 if (!skip_rest_of_patch) {
365 struct stat statbuf;
366 char *realout = outname;
367
368 if (!check_only) {
369 if (move_file(TMPOUTNAME, outname) < 0) {
370 toutkeep = true;
371 realout = TMPOUTNAME;
372 chmod(TMPOUTNAME, filemode);
373 } else
374 chmod(outname, filemode);
375
376 if (remove_empty_files &&
377 stat(realout, &statbuf) == 0 &&
378 statbuf.st_size == 0) {
379 if (verbose)
380 say("Removing %s (empty after patching).\n",
381 realout);
382 unlink(realout);
383 }
384 }
385 }
386 if (ferror(rejfp) || fclose(rejfp)) {
387 say("Error writing %s\n", rejname);
388 error = 1;
389 }
390 rejfp = NULL;
391 if (failed) {
392 error = 1;
393 if (*rejname == '\0') {
394 if (strlcpy(rejname, outname,
395 sizeof(rejname)) >= sizeof(rejname))
396 fatal("filename %s is too long\n", outname);
397 if (strlcat(rejname, REJEXT,
398 sizeof(rejname)) >= sizeof(rejname))
399 fatal("filename %s is too long\n", outname);
400 }
401 if (skip_rest_of_patch) {
402 say("%d out of %d hunks ignored--saving rejects to %s\n",
403 failed, hunk, rejname);
404 } else {
405 say("%d out of %d hunks failed--saving rejects to %s\n",
406 failed, hunk, rejname);
407 }
408 if (!check_only && move_file(TMPREJNAME, rejname) < 0)
409 trejkeep = true;
410 }
411 set_signals(1);
412 }
413 my_exit(error);
414 /* NOTREACHED */
415 }
416
417 /* Prepare to find the next patch to do in the patch file. */
418
419 static void
420 reinitialize_almost_everything(void)
421 {
422 re_patch();
423 re_input();
424
425 input_lines = 0;
426 last_frozen_line = 0;
427
428 filec = 0;
429 if (!out_of_mem) {
430 free(filearg[0]);
431 filearg[0] = NULL;
432 }
433
434 free(outname);
435 outname = NULL;
436
437 last_offset = 0;
438 diff_type = 0;
439
440 free(revision);
441 revision = NULL;
442
443 reverse = reverse_flag_specified;
444 skip_rest_of_patch = false;
445
446 get_some_switches();
447 }
448
449 /* Process switches and filenames. */
450
451 static void
452 get_some_switches(void)
453 {
454 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:";
455 static struct option longopts[] = {
456 {"backup", no_argument, 0, 'b'},
457 {"batch", no_argument, 0, 't'},
458 {"check", no_argument, 0, 'C'},
459 {"context", no_argument, 0, 'c'},
460 {"debug", required_argument, 0, 'x'},
461 {"directory", required_argument, 0, 'd'},
462 {"ed", no_argument, 0, 'e'},
463 {"force", no_argument, 0, 'f'},
464 {"forward", no_argument, 0, 'N'},
465 {"fuzz", required_argument, 0, 'F'},
466 {"ifdef", required_argument, 0, 'D'},
467 {"input", required_argument, 0, 'i'},
468 {"ignore-whitespace", no_argument, 0, 'l'},
469 {"normal", no_argument, 0, 'n'},
470 {"output", required_argument, 0, 'o'},
471 {"prefix", required_argument, 0, 'B'},
472 {"quiet", no_argument, 0, 's'},
473 {"reject-file", required_argument, 0, 'r'},
474 {"remove-empty-files", no_argument, 0, 'E'},
475 {"reverse", no_argument, 0, 'R'},
476 {"silent", no_argument, 0, 's'},
477 {"strip", required_argument, 0, 'p'},
478 {"suffix", required_argument, 0, 'z'},
479 {"unified", no_argument, 0, 'u'},
480 {"version", no_argument, 0, 'v'},
481 {"version-control", required_argument, 0, 'V'},
482 {"posix", no_argument, &posix, 1},
483 {NULL, 0, 0, 0}
484 };
485 int ch;
486
487 rejname[0] = '\0';
488 Argc_last = Argc;
489 Argv_last = Argv;
490 if (!Argc)
491 return;
492 optreset = optind = 1;
493 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) {
494 switch (ch) {
495 case 'b':
496 if (backup_type == none)
497 backup_type = numbered_existing;
498 if (optarg == NULL)
499 break;
500 if (verbose)
501 say("Warning, the ``-b suffix'' option has been"
502 " obsoleted by the -z option.\n");
503 /* FALLTHROUGH */
504 case 'z':
505 /* must directly follow 'b' case for backwards compat */
506 simple_backup_suffix = savestr(optarg);
507 break;
508 case 'B':
509 origprae = savestr(optarg);
510 break;
511 case 'c':
512 diff_type = CONTEXT_DIFF;
513 break;
514 case 'C':
515 check_only = true;
516 break;
517 case 'd':
518 if (chdir(optarg) < 0)
519 pfatal("can't cd to %s", optarg);
520 break;
521 case 'D':
522 do_defines = true;
523 if (!isalpha((unsigned char)*optarg) && *optarg != '_')
524 fatal("argument to -D is not an identifier\n");
525 snprintf(if_defined, sizeof if_defined,
526 "#ifdef %s\n", optarg);
527 snprintf(not_defined, sizeof not_defined,
528 "#ifndef %s\n", optarg);
529 snprintf(end_defined, sizeof end_defined,
530 "#endif /* %s */\n", optarg);
531 break;
532 case 'e':
533 diff_type = ED_DIFF;
534 break;
535 case 'E':
536 remove_empty_files = true;
537 break;
538 case 'f':
539 force = true;
540 break;
541 case 'F':
542 maxfuzz = atoi(optarg);
543 break;
544 case 'i':
545 if (++filec == MAXFILEC)
546 fatal("too many file arguments\n");
547 filearg[filec] = savestr(optarg);
548 break;
549 case 'l':
550 canonicalize = true;
551 break;
552 case 'n':
553 diff_type = NORMAL_DIFF;
554 break;
555 case 'N':
556 noreverse = true;
557 break;
558 case 'o':
559 outname = savestr(optarg);
560 break;
561 case 'p':
562 strippath = atoi(optarg);
563 break;
564 case 'r':
565 if (strlcpy(rejname, optarg,
566 sizeof(rejname)) >= sizeof(rejname))
567 fatal("argument for -r is too long\n");
568 break;
569 case 'R':
570 reverse = true;
571 reverse_flag_specified = true;
572 break;
573 case 's':
574 verbose = false;
575 break;
576 case 't':
577 batch = true;
578 break;
579 case 'u':
580 diff_type = UNI_DIFF;
581 break;
582 case 'v':
583 version();
584 break;
585 case 'V':
586 backup_type = get_version(optarg);
587 break;
588 #ifdef DEBUGGING
589 case 'x':
590 debug = atoi(optarg);
591 break;
592 #endif
593 default:
594 if (ch != '\0')
595 usage();
596 break;
597 }
598 }
599 Argc -= optind;
600 Argv += optind;
601
602 if (Argc > 0) {
603 filearg[0] = savestr(*Argv++);
604 Argc--;
605 while (Argc > 0) {
606 if (++filec == MAXFILEC)
607 fatal("too many file arguments\n");
608 filearg[filec] = savestr(*Argv++);
609 Argc--;
610 }
611 }
612
613 if (getenv("POSIXLY_CORRECT") != NULL)
614 posix = 1;
615 }
616
617 static void
618 usage(void)
619 {
620 fprintf(stderr,
621 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n"
622 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n"
623 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n"
624 " [--posix] [origfile [patchfile]]\n"
625 " patch <patchfile\n");
626 my_exit(EXIT_FAILURE);
627 }
628
629 /*
630 * Attempt to find the right place to apply this hunk of patch.
631 */
632 static LINENUM
633 locate_hunk(LINENUM fuzz)
634 {
635 LINENUM first_guess = pch_first() + last_offset;
636 LINENUM offset;
637 LINENUM pat_lines = pch_ptrn_lines();
638 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1;
639 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context();
640
641 if (pat_lines == 0) { /* null range matches always */
642 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF
643 || diff_type == NEW_CONTEXT_DIFF
644 || diff_type == UNI_DIFF)) {
645 say("Empty context always matches.\n");
646 }
647 return (first_guess);
648 }
649 if (max_neg_offset >= first_guess) /* do not try lines < 0 */
650 max_neg_offset = first_guess - 1;
651 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz))
652 return first_guess;
653 for (offset = 1; ; offset++) {
654 bool check_after = (offset <= max_pos_offset);
655 bool check_before = (offset <= max_neg_offset);
656
657 if (check_after && patch_match(first_guess, offset, fuzz)) {
658 #ifdef DEBUGGING
659 if (debug & 1)
660 say("Offset changing from %ld to %ld\n",
661 last_offset, offset);
662 #endif
663 last_offset = offset;
664 return first_guess + offset;
665 } else if (check_before && patch_match(first_guess, -offset, fuzz)) {
666 #ifdef DEBUGGING
667 if (debug & 1)
668 say("Offset changing from %ld to %ld\n",
669 last_offset, -offset);
670 #endif
671 last_offset = -offset;
672 return first_guess - offset;
673 } else if (!check_before && !check_after)
674 return 0;
675 }
676 }
677
678 /* We did not find the pattern, dump out the hunk so they can handle it. */
679
680 static void
681 abort_context_hunk(void)
682 {
683 LINENUM i;
684 const LINENUM pat_end = pch_end();
685 /*
686 * add in last_offset to guess the same as the previous successful
687 * hunk
688 */
689 const LINENUM oldfirst = pch_first() + last_offset;
690 const LINENUM newfirst = pch_newfirst() + last_offset;
691 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1;
692 const LINENUM newlast = newfirst + pch_repl_lines() - 1;
693 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : "");
694 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----");
695
696 fprintf(rejfp, "***************\n");
697 for (i = 0; i <= pat_end; i++) {
698 switch (pch_char(i)) {
699 case '*':
700 if (oldlast < oldfirst)
701 fprintf(rejfp, "*** 0%s\n", stars);
702 else if (oldlast == oldfirst)
703 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars);
704 else
705 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst,
706 oldlast, stars);
707 break;
708 case '=':
709 if (newlast < newfirst)
710 fprintf(rejfp, "--- 0%s\n", minuses);
711 else if (newlast == newfirst)
712 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses);
713 else
714 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst,
715 newlast, minuses);
716 break;
717 case '\n':
718 fprintf(rejfp, "%s", pfetch(i));
719 break;
720 case ' ':
721 case '-':
722 case '+':
723 case '!':
724 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i));
725 break;
726 default:
727 fatal("fatal internal error in abort_context_hunk\n");
728 }
729 }
730 }
731
732 static void
733 rej_line(int ch, LINENUM i)
734 {
735 size_t len;
736 const char *line = pfetch(i);
737
738 len = strlen(line);
739
740 fprintf(rejfp, "%c%s", ch, line);
741 if (len == 0 || line[len-1] != '\n')
742 fprintf(rejfp, "\n\\ No newline at end of file\n");
743 }
744
745 static void
746 abort_hunk(void)
747 {
748 LINENUM i, j, split;
749 int ch1, ch2;
750 const LINENUM pat_end = pch_end();
751 const LINENUM oldfirst = pch_first() + last_offset;
752 const LINENUM newfirst = pch_newfirst() + last_offset;
753
754 if (diff_type != UNI_DIFF) {
755 abort_context_hunk();
756 return;
757 }
758 split = -1;
759 for (i = 0; i <= pat_end; i++) {
760 if (pch_char(i) == '=') {
761 split = i;
762 break;
763 }
764 }
765 if (split == -1) {
766 fprintf(rejfp, "malformed hunk: no split found\n");
767 return;
768 }
769 i = 0;
770 j = split + 1;
771 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n",
772 pch_ptrn_lines() ? oldfirst : 0,
773 pch_ptrn_lines(), newfirst, pch_repl_lines());
774 while (i < split || j <= pat_end) {
775 ch1 = i < split ? pch_char(i) : -1;
776 ch2 = j <= pat_end ? pch_char(j) : -1;
777 if (ch1 == '-') {
778 rej_line('-', i);
779 i++;
780 } else if (ch1 == ' ' && ch2 == ' ') {
781 rej_line(' ', i);
782 i++;
783 j++;
784 } else if (ch1 == '!' && ch2 == '!') {
785 while (i < split && ch1 == '!') {
786 rej_line('-', i);
787 i++;
788 ch1 = i < split ? pch_char(i) : -1;
789 }
790 while (j <= pat_end && ch2 == '!') {
791 rej_line('+', j);
792 j++;
793 ch2 = j <= pat_end ? pch_char(j) : -1;
794 }
795 } else if (ch1 == '*') {
796 i++;
797 } else if (ch2 == '+' || ch2 == ' ') {
798 rej_line(ch2, j);
799 j++;
800 } else {
801 fprintf(rejfp, "internal error on (%ld %ld %ld)\n",
802 i, split, j);
803 rej_line(ch1, i);
804 rej_line(ch2, j);
805 return;
806 }
807 }
808 }
809
810 /* We found where to apply it (we hope), so do it. */
811
812 static void
813 apply_hunk(LINENUM where)
814 {
815 LINENUM old = 1;
816 const LINENUM lastline = pch_ptrn_lines();
817 LINENUM new = lastline + 1;
818 #define OUTSIDE 0
819 #define IN_IFNDEF 1
820 #define IN_IFDEF 2
821 #define IN_ELSE 3
822 int def_state = OUTSIDE;
823 const LINENUM pat_end = pch_end();
824
825 where--;
826 while (pch_char(new) == '=' || pch_char(new) == '\n')
827 new++;
828
829 while (old <= lastline) {
830 if (pch_char(old) == '-') {
831 copy_till(where + old - 1, false);
832 if (do_defines) {
833 if (def_state == OUTSIDE) {
834 fputs(not_defined, ofp);
835 def_state = IN_IFNDEF;
836 } else if (def_state == IN_IFDEF) {
837 fputs(else_defined, ofp);
838 def_state = IN_ELSE;
839 }
840 fputs(pfetch(old), ofp);
841 }
842 last_frozen_line++;
843 old++;
844 } else if (new > pat_end) {
845 break;
846 } else if (pch_char(new) == '+') {
847 copy_till(where + old - 1, false);
848 if (do_defines) {
849 if (def_state == IN_IFNDEF) {
850 fputs(else_defined, ofp);
851 def_state = IN_ELSE;
852 } else if (def_state == OUTSIDE) {
853 fputs(if_defined, ofp);
854 def_state = IN_IFDEF;
855 }
856 }
857 fputs(pfetch(new), ofp);
858 new++;
859 } else if (pch_char(new) != pch_char(old)) {
860 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n",
861 pch_hunk_beg() + old,
862 pch_hunk_beg() + new);
863 #ifdef DEBUGGING
864 say("oldchar = '%c', newchar = '%c'\n",
865 pch_char(old), pch_char(new));
866 #endif
867 my_exit(2);
868 } else if (pch_char(new) == '!') {
869 copy_till(where + old - 1, false);
870 if (do_defines) {
871 fputs(not_defined, ofp);
872 def_state = IN_IFNDEF;
873 }
874 while (pch_char(old) == '!') {
875 if (do_defines) {
876 fputs(pfetch(old), ofp);
877 }
878 last_frozen_line++;
879 old++;
880 }
881 if (do_defines) {
882 fputs(else_defined, ofp);
883 def_state = IN_ELSE;
884 }
885 while (pch_char(new) == '!') {
886 fputs(pfetch(new), ofp);
887 new++;
888 }
889 } else {
890 if (pch_char(new) != ' ')
891 fatal("Internal error: expected ' '\n");
892 old++;
893 new++;
894 if (do_defines && def_state != OUTSIDE) {
895 fputs(end_defined, ofp);
896 def_state = OUTSIDE;
897 }
898 }
899 }
900 if (new <= pat_end && pch_char(new) == '+') {
901 copy_till(where + old - 1, false);
902 if (do_defines) {
903 if (def_state == OUTSIDE) {
904 fputs(if_defined, ofp);
905 def_state = IN_IFDEF;
906 } else if (def_state == IN_IFNDEF) {
907 fputs(else_defined, ofp);
908 def_state = IN_ELSE;
909 }
910 }
911 while (new <= pat_end && pch_char(new) == '+') {
912 fputs(pfetch(new), ofp);
913 new++;
914 }
915 }
916 if (do_defines && def_state != OUTSIDE) {
917 fputs(end_defined, ofp);
918 }
919 }
920
921 /*
922 * Open the new file.
923 */
924 static void
925 init_output(const char *name)
926 {
927 ofp = fopen(name, "w");
928 if (ofp == NULL)
929 pfatal("can't create %s", name);
930 }
931
932 /*
933 * Open a file to put hunks we can't locate.
934 */
935 static void
936 init_reject(const char *name)
937 {
938 rejfp = fopen(name, "w");
939 if (rejfp == NULL)
940 pfatal("can't create %s", name);
941 }
942
943 /*
944 * Copy input file to output, up to wherever hunk is to be applied.
945 * If endoffile is true, treat the last line specially since it may
946 * lack a newline.
947 */
948 static void
949 copy_till(LINENUM lastline, bool endoffile)
950 {
951 if (last_frozen_line > lastline)
952 fatal("misordered hunks! output would be garbled\n");
953 while (last_frozen_line < lastline) {
954 if (++last_frozen_line == lastline && endoffile)
955 dump_line(last_frozen_line, !last_line_missing_eol);
956 else
957 dump_line(last_frozen_line, true);
958 }
959 }
960
961 /*
962 * Finish copying the input file to the output file.
963 */
964 static bool
965 spew_output(void)
966 {
967 int rv;
968
969 #ifdef DEBUGGING
970 if (debug & 256)
971 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line);
972 #endif
973 if (input_lines)
974 copy_till(input_lines, true); /* dump remainder of file */
975 rv = ferror(ofp) == 0 && fclose(ofp) == 0;
976 ofp = NULL;
977 return rv;
978 }
979
980 /*
981 * Copy one line from input to output.
982 */
983 static void
984 dump_line(LINENUM line, bool write_newline)
985 {
986 char *s;
987
988 s = ifetch(line, 0);
989 if (s == NULL)
990 return;
991 /* Note: string is not NUL terminated. */
992 for (; *s != '\n'; s++)
993 putc(*s, ofp);
994 if (write_newline)
995 putc('\n', ofp);
996 }
997
998 /*
999 * Does the patch pattern match at line base+offset?
1000 */
1001 static bool
1002 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz)
1003 {
1004 LINENUM pline = 1 + fuzz;
1005 LINENUM iline;
1006 LINENUM pat_lines = pch_ptrn_lines() - fuzz;
1007 const char *ilineptr;
1008 const char *plineptr;
1009 short plinelen;
1010
1011 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) {
1012 ilineptr = ifetch(iline, offset >= 0);
1013 if (ilineptr == NULL)
1014 return false;
1015 plineptr = pfetch(pline);
1016 plinelen = pch_line_len(pline);
1017 if (canonicalize) {
1018 if (!similar(ilineptr, plineptr, plinelen))
1019 return false;
1020 } else if (strnNE(ilineptr, plineptr, plinelen))
1021 return false;
1022 if (iline == input_lines) {
1023 /*
1024 * We are looking at the last line of the file.
1025 * If the file has no eol, the patch line should
1026 * not have one either and vice-versa. Note that
1027 * plinelen > 0.
1028 */
1029 if (last_line_missing_eol) {
1030 if (plineptr[plinelen - 1] == '\n')
1031 return false;
1032 } else {
1033 if (plineptr[plinelen - 1] != '\n')
1034 return false;
1035 }
1036 }
1037 }
1038 return true;
1039 }
1040
1041 /*
1042 * Do two lines match with canonicalized white space?
1043 */
1044 static bool
1045 similar(const char *a, const char *b, int len)
1046 {
1047 while (len) {
1048 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */
1049 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */
1050 return false;
1051 while (len && isspace((unsigned char)*b) && *b != '\n')
1052 b++, len--; /* skip pattern whitespace */
1053 while (isspace((unsigned char)*a) && *a != '\n')
1054 a++; /* skip target whitespace */
1055 if (*a == '\n' || *b == '\n')
1056 return (*a == *b); /* should end in sync */
1057 } else if (*a++ != *b++) /* match non-whitespace chars */
1058 return false;
1059 else
1060 len--; /* probably not necessary */
1061 }
1062 return true; /* actually, this is not reached */
1063 /* since there is always a \n */
1064 }
MINIX 3 (repo.or.cz mirror)