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HAMMER 59B/Many: Stabilization pass - fixes for large file issues
[dragonfly.git] / usr.bin / patch / patch.c
blobf984e59ed6b3ea472407a3f4991901719ba7a85d
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 1.7 2007/09/29 23:11:10 swildner Exp $
4 */
5
6 /*
7 * patch - a program to apply diffs to original files
8 *
9 * Copyright 1986, Larry Wall
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following condition is met:
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this condition and the following disclaimer.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * -C option added in 1998, original code by Marc Espie, based on FreeBSD
29 * behaviour
30 */
31
32 #include <sys/types.h>
33 #include <sys/stat.h>
34
35 #include <ctype.h>
36 #include <getopt.h>
37 #include <limits.h>
38 #include <stdio.h>
39 #include <string.h>
40 #include <stdlib.h>
41 #include <unistd.h>
42
43 #include "common.h"
44 #include "util.h"
45 #include "pch.h"
46 #include "inp.h"
47 #include "backupfile.h"
48 #include "pathnames.h"
49
50 mode_t filemode = 0644;
51
52 char buf[MAXLINELEN]; /* general purpose buffer */
53 size_t buf_len = sizeof(buf);
54
55 bool using_plan_a = true; /* try to keep everything in memory */
56 bool out_of_mem = false; /* ran out of memory in plan a */
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 void 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 /* buffer holding the name of the rejected patch file. */
114 static char rejname[NAME_MAX + 1];
115
116 /* buffer for stderr */
117 static char serrbuf[BUFSIZ];
118
119 /* how many input lines have been irretractibly output */
120 static LINENUM last_frozen_line = 0;
121
122 static int Argc; /* guess */
123 static char **Argv;
124 static int Argc_last; /* for restarting plan_b */
125 static char **Argv_last;
126
127 static FILE *ofp = NULL; /* output file pointer */
128 static FILE *rejfp = NULL; /* reject file pointer */
129
130 static int filec = 0; /* how many file arguments? */
131 static LINENUM last_offset = 0;
132 static LINENUM maxfuzz = 2;
133
134 /* patch using ifdef, ifndef, etc. */
135 static bool do_defines = false;
136 /* #ifdef xyzzy */
137 static char if_defined[128];
138 /* #ifndef xyzzy */
139 static char not_defined[128];
140 /* #else */
141 static const char else_defined[] = "#else\n";
142 /* #endif xyzzy */
143 static char end_defined[128];
144
145
146 /* Apply a set of diffs as appropriate. */
147
148 int
149 main(int argc, char *argv[])
150 {
151 int error = 0, hunk, failed, i, fd;
152 LINENUM where = 0, newwhere, fuzz, mymaxfuzz;
153 const char *tmpdir;
154 char *v;
155
156 setbuf(stderr, serrbuf);
157 for (i = 0; i < MAXFILEC; i++)
158 filearg[i] = NULL;
159
160 /* Cons up the names of the temporary files. */
161 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0')
162 tmpdir = _PATH_TMP;
163 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--)
164 ;
165 i++;
166 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1)
167 fatal("cannot allocate memory");
168 if ((fd = mkstemp(TMPOUTNAME)) < 0)
169 pfatal("can't create %s", TMPOUTNAME);
170 close(fd);
171
172 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1)
173 fatal("cannot allocate memory");
174 if ((fd = mkstemp(TMPINNAME)) < 0)
175 pfatal("can't create %s", TMPINNAME);
176 close(fd);
177
178 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1)
179 fatal("cannot allocate memory");
180 if ((fd = mkstemp(TMPREJNAME)) < 0)
181 pfatal("can't create %s", TMPREJNAME);
182 close(fd);
183
184 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1)
185 fatal("cannot allocate memory");
186 if ((fd = mkstemp(TMPPATNAME)) < 0)
187 pfatal("can't create %s", TMPPATNAME);
188 close(fd);
189
190 v = getenv("SIMPLE_BACKUP_SUFFIX");
191 if (v)
192 simple_backup_suffix = v;
193 else
194 simple_backup_suffix = ORIGEXT;
195
196 /* parse switches */
197 Argc = argc;
198 Argv = argv;
199 get_some_switches();
200
201 if (backup_type == none) {
202 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL)
203 v = getenv("VERSION_CONTROL");
204 if (v != NULL || !posix)
205 backup_type = get_version(v); /* OK to pass NULL. */
206 }
207
208 /* make sure we clean up /tmp in case of disaster */
209 set_signals(0);
210
211 for (open_patch_file(filearg[1]); there_is_another_patch();
212 reinitialize_almost_everything()) {
213 /* for each patch in patch file */
214
215 warn_on_invalid_line = true;
216
217 if (outname == NULL)
218 outname = savestr(filearg[0]);
219
220 /* for ed script just up and do it and exit */
221 if (diff_type == ED_DIFF) {
222 do_ed_script();
223 continue;
224 }
225 /* initialize the patched file */
226 if (!skip_rest_of_patch)
227 init_output(TMPOUTNAME);
228
229 /* initialize reject file */
230 init_reject(TMPREJNAME);
231
232 /* find out where all the lines are */
233 if (!skip_rest_of_patch)
234 scan_input(filearg[0]);
235
236 /* from here on, open no standard i/o files, because malloc */
237 /* might misfire and we can't catch it easily */
238
239 /* apply each hunk of patch */
240 hunk = 0;
241 failed = 0;
242 out_of_mem = false;
243 while (another_hunk()) {
244 hunk++;
245 fuzz = 0;
246 mymaxfuzz = pch_context();
247 if (maxfuzz < mymaxfuzz)
248 mymaxfuzz = maxfuzz;
249 if (!skip_rest_of_patch) {
250 do {
251 where = locate_hunk(fuzz);
252 if (hunk == 1 && where == 0 && !force) {
253 /* dwim for reversed patch? */
254 if (!pch_swap()) {
255 if (fuzz == 0)
256 say("Not enough memory to try swapped hunk! Assuming unswapped.\n");
257 continue;
258 }
259 reverse = !reverse;
260 /* try again */
261 where = locate_hunk(fuzz);
262 if (where == 0) {
263 /* didn't find it swapped */
264 if (!pch_swap())
265 /* put it back to normal */
266 fatal("lost hunk on alloc error!\n");
267 reverse = !reverse;
268 } else if (noreverse) {
269 if (!pch_swap())
270 /* put it back to normal */
271 fatal("lost hunk on alloc error!\n");
272 reverse = !reverse;
273 say("Ignoring previously applied (or reversed) patch.\n");
274 skip_rest_of_patch = true;
275 } else if (batch) {
276 if (verbose)
277 say("%seversed (or previously applied) patch detected! %s -R.",
278 reverse ? "R" : "Unr",
279 reverse ? "Assuming" : "Ignoring");
280 } else {
281 ask("%seversed (or previously applied) patch detected! %s -R? [y] ",
282 reverse ? "R" : "Unr",
283 reverse ? "Assume" : "Ignore");
284 if (*buf == 'n') {
285 ask("Apply anyway? [n] ");
286 if (*buf != 'y')
287 skip_rest_of_patch = true;
288 where = 0;
289 reverse = !reverse;
290 if (!pch_swap())
291 /* put it back to normal */
292 fatal("lost hunk on alloc error!\n");
293 }
294 }
295 }
296 } while (!skip_rest_of_patch && where == 0 &&
297 ++fuzz <= mymaxfuzz);
298
299 if (skip_rest_of_patch) { /* just got decided */
300 fclose(ofp);
301 ofp = NULL;
302 }
303 }
304 newwhere = pch_newfirst() + last_offset;
305 if (skip_rest_of_patch) {
306 abort_hunk();
307 failed++;
308 if (verbose)
309 say("Hunk #%d ignored at %ld.\n",
310 hunk, newwhere);
311 } else if (where == 0) {
312 abort_hunk();
313 failed++;
314 if (verbose)
315 say("Hunk #%d failed at %ld.\n",
316 hunk, newwhere);
317 } else {
318 apply_hunk(where);
319 if (verbose) {
320 say("Hunk #%d succeeded at %ld",
321 hunk, newwhere);
322 if (fuzz != 0)
323 say(" with fuzz %ld", fuzz);
324 if (last_offset)
325 say(" (offset %ld line%s)",
326 last_offset,
327 last_offset == 1L ? "" : "s");
328 say(".\n");
329 }
330 }
331 }
332
333 if (out_of_mem && using_plan_a) {
334 Argc = Argc_last;
335 Argv = Argv_last;
336 say("\n\nRan out of memory using Plan A--trying again...\n\n");
337 if (ofp)
338 fclose(ofp);
339 ofp = NULL;
340 if (rejfp)
341 fclose(rejfp);
342 rejfp = NULL;
343 continue;
344 }
345 if (hunk == 0)
346 fatal("Internal error: hunk should not be 0\n");
347
348 /* finish spewing out the new file */
349 if (!skip_rest_of_patch)
350 spew_output();
351
352 /* and put the output where desired */
353 ignore_signals();
354 if (!skip_rest_of_patch) {
355 struct stat statbuf;
356 char *realout = outname;
357
358 if (!check_only) {
359 if (move_file(TMPOUTNAME, outname) < 0) {
360 toutkeep = true;
361 realout = TMPOUTNAME;
362 chmod(TMPOUTNAME, filemode);
363 } else
364 chmod(outname, filemode);
365
366 if (remove_empty_files &&
367 stat(realout, &statbuf) == 0 &&
368 statbuf.st_size == 0) {
369 if (verbose)
370 say("Removing %s (empty after patching).\n",
371 realout);
372 unlink(realout);
373 }
374 }
375 }
376 fclose(rejfp);
377 rejfp = NULL;
378 if (failed) {
379 error = 1;
380 if (*rejname == '\0') {
381 if (strlcpy(rejname, outname,
382 sizeof(rejname)) >= sizeof(rejname))
383 fatal("filename %s is too long\n", outname);
384 if (strlcat(rejname, REJEXT,
385 sizeof(rejname)) >= sizeof(rejname))
386 fatal("filename %s is too long\n", outname);
387 }
388 if (skip_rest_of_patch) {
389 say("%d out of %d hunks ignored--saving rejects to %s\n",
390 failed, hunk, rejname);
391 } else {
392 say("%d out of %d hunks failed--saving rejects to %s\n",
393 failed, hunk, rejname);
394 }
395 if (!check_only && move_file(TMPREJNAME, rejname) < 0)
396 trejkeep = true;
397 }
398 set_signals(1);
399 }
400 my_exit(error);
401 /* NOTREACHED */
402 }
403
404 /* Prepare to find the next patch to do in the patch file. */
405
406 static void
407 reinitialize_almost_everything(void)
408 {
409 re_patch();
410 re_input();
411
412 input_lines = 0;
413 last_frozen_line = 0;
414
415 filec = 0;
416 if (!out_of_mem) {
417 free(filearg[0]);
418 filearg[0] = NULL;
419 }
420
421 free(outname);
422 outname = NULL;
423
424 last_offset = 0;
425 diff_type = 0;
426
427 free(revision);
428 revision = NULL;
429
430 reverse = reverse_flag_specified;
431 skip_rest_of_patch = false;
432
433 get_some_switches();
434 }
435
436 /* Process switches and filenames. */
437
438 static void
439 get_some_switches(void)
440 {
441 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:";
442 static struct option longopts[] = {
443 {"backup", no_argument, 0, 'b'},
444 {"batch", no_argument, 0, 't'},
445 {"check", no_argument, 0, 'C'},
446 {"context", no_argument, 0, 'c'},
447 {"debug", required_argument, 0, 'x'},
448 {"directory", required_argument, 0, 'd'},
449 {"ed", no_argument, 0, 'e'},
450 {"force", no_argument, 0, 'f'},
451 {"forward", no_argument, 0, 'N'},
452 {"fuzz", required_argument, 0, 'F'},
453 {"ifdef", required_argument, 0, 'D'},
454 {"input", required_argument, 0, 'i'},
455 {"ignore-whitespace", no_argument, 0, 'l'},
456 {"normal", no_argument, 0, 'n'},
457 {"output", required_argument, 0, 'o'},
458 {"prefix", required_argument, 0, 'B'},
459 {"quiet", no_argument, 0, 's'},
460 {"reject-file", required_argument, 0, 'r'},
461 {"remove-empty-files", no_argument, 0, 'E'},
462 {"reverse", no_argument, 0, 'R'},
463 {"silent", no_argument, 0, 's'},
464 {"strip", required_argument, 0, 'p'},
465 {"suffix", required_argument, 0, 'z'},
466 {"unified", no_argument, 0, 'u'},
467 {"version", no_argument, 0, 'v'},
468 {"version-control", required_argument, 0, 'V'},
469 {"posix", no_argument, &posix, 1},
470 {NULL, 0, 0, 0}
471 };
472 int ch;
473
474 rejname[0] = '\0';
475 Argc_last = Argc;
476 Argv_last = Argv;
477 if (!Argc)
478 return;
479 optreset = optind = 1;
480 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) {
481 switch (ch) {
482 case 'b':
483 if (backup_type == none)
484 backup_type = numbered_existing;
485 if (optarg == NULL)
486 break;
487 if (verbose)
488 say("Warning, the ``-b suffix'' option has been"
489 " obsoleted by the -z option.\n");
490 /* FALLTHROUGH */
491 case 'z':
492 /* must directly follow 'b' case for backwards compat */
493 simple_backup_suffix = savestr(optarg);
494 break;
495 case 'B':
496 origprae = savestr(optarg);
497 break;
498 case 'c':
499 diff_type = CONTEXT_DIFF;
500 break;
501 case 'C':
502 check_only = true;
503 break;
504 case 'd':
505 if (chdir(optarg) < 0)
506 pfatal("can't cd to %s", optarg);
507 break;
508 case 'D':
509 do_defines = true;
510 if (!isalpha((unsigned char)*optarg) && *optarg != '_')
511 fatal("argument to -D is not an identifier\n");
512 snprintf(if_defined, sizeof if_defined,
513 "#ifdef %s\n", optarg);
514 snprintf(not_defined, sizeof not_defined,
515 "#ifndef %s\n", optarg);
516 snprintf(end_defined, sizeof end_defined,
517 "#endif /* %s */\n", optarg);
518 break;
519 case 'e':
520 diff_type = ED_DIFF;
521 break;
522 case 'E':
523 remove_empty_files = true;
524 break;
525 case 'f':
526 force = true;
527 break;
528 case 'F':
529 maxfuzz = atoi(optarg);
530 break;
531 case 'i':
532 if (++filec == MAXFILEC)
533 fatal("too many file arguments\n");
534 filearg[filec] = savestr(optarg);
535 break;
536 case 'l':
537 canonicalize = true;
538 break;
539 case 'n':
540 diff_type = NORMAL_DIFF;
541 break;
542 case 'N':
543 noreverse = true;
544 break;
545 case 'o':
546 outname = savestr(optarg);
547 break;
548 case 'p':
549 strippath = atoi(optarg);
550 break;
551 case 'r':
552 if (strlcpy(rejname, optarg,
553 sizeof(rejname)) >= sizeof(rejname))
554 fatal("argument for -r is too long\n");
555 break;
556 case 'R':
557 reverse = true;
558 reverse_flag_specified = true;
559 break;
560 case 's':
561 verbose = false;
562 break;
563 case 't':
564 batch = true;
565 break;
566 case 'u':
567 diff_type = UNI_DIFF;
568 break;
569 case 'v':
570 version();
571 break;
572 case 'V':
573 backup_type = get_version(optarg);
574 break;
575 #ifdef DEBUGGING
576 case 'x':
577 debug = atoi(optarg);
578 break;
579 #endif
580 default:
581 if (ch != '\0')
582 usage();
583 break;
584 }
585 }
586 Argc -= optind;
587 Argv += optind;
588
589 if (Argc > 0) {
590 filearg[0] = savestr(*Argv++);
591 Argc--;
592 while (Argc > 0) {
593 if (++filec == MAXFILEC)
594 fatal("too many file arguments\n");
595 filearg[filec] = savestr(*Argv++);
596 Argc--;
597 }
598 }
599
600 if (getenv("POSIXLY_CORRECT") != NULL)
601 posix = 1;
602 }
603
604 static void
605 usage(void)
606 {
607 fprintf(stderr,
608 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n"
609 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n"
610 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n"
611 " [--posix] [origfile [patchfile]]\n"
612 " patch <patchfile\n");
613 my_exit(EXIT_SUCCESS);
614 }
615
616 /*
617 * Attempt to find the right place to apply this hunk of patch.
618 */
619 static LINENUM
620 locate_hunk(LINENUM fuzz)
621 {
622 LINENUM first_guess = pch_first() + last_offset;
623 LINENUM offset;
624 LINENUM pat_lines = pch_ptrn_lines();
625 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1;
626 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context();
627
628 if (pat_lines == 0) { /* null range matches always */
629 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF
630 || diff_type == NEW_CONTEXT_DIFF
631 || diff_type == UNI_DIFF)) {
632 say("Empty context always matches.\n");
633 }
634 if (diff_type == CONTEXT_DIFF
635 || diff_type == NEW_CONTEXT_DIFF
636 || diff_type == UNI_DIFF) {
637 if (fuzz == 0)
638 return (input_lines == 0 ? first_guess : 0);
639 } else
640 return (first_guess);
641 }
642 if (max_neg_offset >= first_guess) /* do not try lines < 0 */
643 max_neg_offset = first_guess - 1;
644 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz))
645 return first_guess;
646 for (offset = 1; ; offset++) {
647 bool check_after = (offset <= max_pos_offset);
648 bool check_before = (offset <= max_neg_offset);
649
650 if (check_after && patch_match(first_guess, offset, fuzz)) {
651 #ifdef DEBUGGING
652 if (debug & 1)
653 say("Offset changing from %ld to %ld\n",
654 last_offset, offset);
655 #endif
656 last_offset = offset;
657 return first_guess + offset;
658 } else if (check_before && patch_match(first_guess, -offset, fuzz)) {
659 #ifdef DEBUGGING
660 if (debug & 1)
661 say("Offset changing from %ld to %ld\n",
662 last_offset, -offset);
663 #endif
664 last_offset = -offset;
665 return first_guess - offset;
666 } else if (!check_before && !check_after)
667 return 0;
668 }
669 }
670
671 /* We did not find the pattern, dump out the hunk so they can handle it. */
672
673 static void
674 abort_context_hunk(void)
675 {
676 LINENUM i;
677 const LINENUM pat_end = pch_end();
678 /*
679 * add in last_offset to guess the same as the previous successful
680 * hunk
681 */
682 const LINENUM oldfirst = pch_first() + last_offset;
683 const LINENUM newfirst = pch_newfirst() + last_offset;
684 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1;
685 const LINENUM newlast = newfirst + pch_repl_lines() - 1;
686 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : "");
687 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----");
688
689 fprintf(rejfp, "***************\n");
690 for (i = 0; i <= pat_end; i++) {
691 switch (pch_char(i)) {
692 case '*':
693 if (oldlast < oldfirst)
694 fprintf(rejfp, "*** 0%s\n", stars);
695 else if (oldlast == oldfirst)
696 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars);
697 else
698 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst,
699 oldlast, stars);
700 break;
701 case '=':
702 if (newlast < newfirst)
703 fprintf(rejfp, "--- 0%s\n", minuses);
704 else if (newlast == newfirst)
705 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses);
706 else
707 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst,
708 newlast, minuses);
709 break;
710 case '\n':
711 fprintf(rejfp, "%s", pfetch(i));
712 break;
713 case ' ':
714 case '-':
715 case '+':
716 case '!':
717 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i));
718 break;
719 default:
720 fatal("fatal internal error in abort_context_hunk\n");
721 }
722 }
723 }
724
725 static void
726 rej_line(int ch, LINENUM i)
727 {
728 size_t len;
729 const char *line = pfetch(i);
730
731 len = strlen(line);
732
733 fprintf(rejfp, "%c%s", ch, line);
734 if (len == 0 || line[len-1] != '\n')
735 fprintf(rejfp, "\n\\ No newline at end of file\n");
736 }
737
738 static void
739 abort_hunk(void)
740 {
741 LINENUM i, j, split;
742 int ch1, ch2;
743 const LINENUM pat_end = pch_end();
744 const LINENUM oldfirst = pch_first() + last_offset;
745 const LINENUM newfirst = pch_newfirst() + last_offset;
746
747 if (diff_type != UNI_DIFF) {
748 abort_context_hunk();
749 return;
750 }
751 split = -1;
752 for (i = 0; i <= pat_end; i++) {
753 if (pch_char(i) == '=') {
754 split = i;
755 break;
756 }
757 }
758 if (split == -1) {
759 fprintf(rejfp, "malformed hunk: no split found\n");
760 return;
761 }
762 i = 0;
763 j = split + 1;
764 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n",
765 pch_ptrn_lines() ? oldfirst : 0,
766 pch_ptrn_lines(), newfirst, pch_repl_lines());
767 while (i < split || j <= pat_end) {
768 ch1 = i < split ? pch_char(i) : -1;
769 ch2 = j <= pat_end ? pch_char(j) : -1;
770 if (ch1 == '-') {
771 rej_line('-', i);
772 i++;
773 } else if (ch1 == ' ' && ch2 == ' ') {
774 rej_line(' ', i);
775 i++;
776 j++;
777 } else if (ch1 == '!' && ch2 == '!') {
778 while (i < split && ch1 == '!') {
779 rej_line('-', i);
780 i++;
781 ch1 = i < split ? pch_char(i) : -1;
782 }
783 while (j <= pat_end && ch2 == '!') {
784 rej_line('+', j);
785 j++;
786 ch2 = j <= pat_end ? pch_char(j) : -1;
787 }
788 } else if (ch1 == '*') {
789 i++;
790 } else if (ch2 == '+' || ch2 == ' ') {
791 rej_line(ch2, j);
792 j++;
793 } else {
794 fprintf(rejfp, "internal error on (%ld %ld %ld)\n",
795 i, split, j);
796 rej_line(ch1, i);
797 rej_line(ch2, j);
798 return;
799 }
800 }
801 }
802
803 /* We found where to apply it (we hope), so do it. */
804
805 static void
806 apply_hunk(LINENUM where)
807 {
808 LINENUM old = 1;
809 const LINENUM lastline = pch_ptrn_lines();
810 LINENUM new = lastline + 1;
811 #define OUTSIDE 0
812 #define IN_IFNDEF 1
813 #define IN_IFDEF 2
814 #define IN_ELSE 3
815 int def_state = OUTSIDE;
816 const LINENUM pat_end = pch_end();
817
818 where--;
819 while (pch_char(new) == '=' || pch_char(new) == '\n')
820 new++;
821
822 while (old <= lastline) {
823 if (pch_char(old) == '-') {
824 copy_till(where + old - 1, false);
825 if (do_defines) {
826 if (def_state == OUTSIDE) {
827 fputs(not_defined, ofp);
828 def_state = IN_IFNDEF;
829 } else if (def_state == IN_IFDEF) {
830 fputs(else_defined, ofp);
831 def_state = IN_ELSE;
832 }
833 fputs(pfetch(old), ofp);
834 }
835 last_frozen_line++;
836 old++;
837 } else if (new > pat_end) {
838 break;
839 } else if (pch_char(new) == '+') {
840 copy_till(where + old - 1, false);
841 if (do_defines) {
842 if (def_state == IN_IFNDEF) {
843 fputs(else_defined, ofp);
844 def_state = IN_ELSE;
845 } else if (def_state == OUTSIDE) {
846 fputs(if_defined, ofp);
847 def_state = IN_IFDEF;
848 }
849 }
850 fputs(pfetch(new), ofp);
851 new++;
852 } else if (pch_char(new) != pch_char(old)) {
853 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n",
854 pch_hunk_beg() + old,
855 pch_hunk_beg() + new);
856 #ifdef DEBUGGING
857 say("oldchar = '%c', newchar = '%c'\n",
858 pch_char(old), pch_char(new));
859 #endif
860 my_exit(2);
861 } else if (pch_char(new) == '!') {
862 copy_till(where + old - 1, false);
863 if (do_defines) {
864 fputs(not_defined, ofp);
865 def_state = IN_IFNDEF;
866 }
867 while (pch_char(old) == '!') {
868 if (do_defines) {
869 fputs(pfetch(old), ofp);
870 }
871 last_frozen_line++;
872 old++;
873 }
874 if (do_defines) {
875 fputs(else_defined, ofp);
876 def_state = IN_ELSE;
877 }
878 while (pch_char(new) == '!') {
879 fputs(pfetch(new), ofp);
880 new++;
881 }
882 } else {
883 if (pch_char(new) != ' ')
884 fatal("Internal error: expected ' '\n");
885 old++;
886 new++;
887 if (do_defines && def_state != OUTSIDE) {
888 fputs(end_defined, ofp);
889 def_state = OUTSIDE;
890 }
891 }
892 }
893 if (new <= pat_end && pch_char(new) == '+') {
894 copy_till(where + old - 1, false);
895 if (do_defines) {
896 if (def_state == OUTSIDE) {
897 fputs(if_defined, ofp);
898 def_state = IN_IFDEF;
899 } else if (def_state == IN_IFNDEF) {
900 fputs(else_defined, ofp);
901 def_state = IN_ELSE;
902 }
903 }
904 while (new <= pat_end && pch_char(new) == '+') {
905 fputs(pfetch(new), ofp);
906 new++;
907 }
908 }
909 if (do_defines && def_state != OUTSIDE) {
910 fputs(end_defined, ofp);
911 }
912 }
913
914 /*
915 * Open the new file.
916 */
917 static void
918 init_output(const char *name)
919 {
920 ofp = fopen(name, "w");
921 if (ofp == NULL)
922 pfatal("can't create %s", name);
923 }
924
925 /*
926 * Open a file to put hunks we can't locate.
927 */
928 static void
929 init_reject(const char *name)
930 {
931 rejfp = fopen(name, "w");
932 if (rejfp == NULL)
933 pfatal("can't create %s", name);
934 }
935
936 /*
937 * Copy input file to output, up to wherever hunk is to be applied.
938 * If endoffile is true, treat the last line specially since it may
939 * lack a newline.
940 */
941 static void
942 copy_till(LINENUM lastline, bool endoffile)
943 {
944 if (last_frozen_line > lastline)
945 fatal("misordered hunks! output would be garbled\n");
946 while (last_frozen_line < lastline) {
947 if (++last_frozen_line == lastline && endoffile)
948 dump_line(last_frozen_line, !last_line_missing_eol);
949 else
950 dump_line(last_frozen_line, true);
951 }
952 }
953
954 /*
955 * Finish copying the input file to the output file.
956 */
957 static void
958 spew_output(void)
959 {
960 #ifdef DEBUGGING
961 if (debug & 256)
962 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line);
963 #endif
964 if (input_lines)
965 copy_till(input_lines, true); /* dump remainder of file */
966 fclose(ofp);
967 ofp = NULL;
968 }
969
970 /*
971 * Copy one line from input to output.
972 */
973 static void
974 dump_line(LINENUM line, bool write_newline)
975 {
976 char *s;
977
978 s = ifetch(line, 0);
979 if (s == NULL)
980 return;
981 /* Note: string is not NUL terminated. */
982 for (; *s != '\n'; s++)
983 putc(*s, ofp);
984 if (write_newline)
985 putc('\n', ofp);
986 }
987
988 /*
989 * Does the patch pattern match at line base+offset?
990 */
991 static bool
992 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz)
993 {
994 LINENUM pline = 1 + fuzz;
995 LINENUM iline;
996 LINENUM pat_lines = pch_ptrn_lines() - fuzz;
997 const char *ilineptr;
998 const char *plineptr;
999 short plinelen;
1000
1001 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) {
1002 ilineptr = ifetch(iline, offset >= 0);
1003 if (ilineptr == NULL)
1004 return false;
1005 plineptr = pfetch(pline);
1006 plinelen = pch_line_len(pline);
1007 if (canonicalize) {
1008 if (!similar(ilineptr, plineptr, plinelen))
1009 return false;
1010 } else if (strnNE(ilineptr, plineptr, plinelen))
1011 return false;
1012 if (iline == input_lines) {
1013 /*
1014 * We are looking at the last line of the file.
1015 * If the file has no eol, the patch line should
1016 * not have one either and vice-versa. Note that
1017 * plinelen > 0.
1018 */
1019 if (last_line_missing_eol) {
1020 if (plineptr[plinelen - 1] == '\n')
1021 return false;
1022 } else {
1023 if (plineptr[plinelen - 1] != '\n')
1024 return false;
1025 }
1026 }
1027 }
1028 return true;
1029 }
1030
1031 /*
1032 * Do two lines match with canonicalized white space?
1033 */
1034 static bool
1035 similar(const char *a, const char *b, int len)
1036 {
1037 while (len) {
1038 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */
1039 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */
1040 return false;
1041 while (len && isspace((unsigned char)*b) && *b != '\n')
1042 b++, len--; /* skip pattern whitespace */
1043 while (isspace((unsigned char)*a) && *a != '\n')
1044 a++; /* skip target whitespace */
1045 if (*a == '\n' || *b == '\n')
1046 return (*a == *b); /* should end in sync */
1047 } else if (*a++ != *b++) /* match non-whitespace chars */
1048 return false;
1049 else
1050 len--; /* probably not necessary */
1051 }
1052 return true; /* actually, this is not reached */
1053 /* since there is always a \n */
1054 }
DragonFly BSD