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[dragonfly.git] / usr.bin / patch / patch.c
blob756f07a14c1d3edf0b2a1bc9501c307075f5c213
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 */
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 bool spew_output(void);
102 static void dump_line(LINENUM, bool);
103 static bool patch_match(LINENUM, LINENUM, LINENUM);
104 static bool similar(const char *, const char *, int);
105 static void usage(void);
106
107 /* true if -E was specified on command line. */
108 static bool remove_empty_files = false;
109
110 /* true if -R was specified on command line. */
111 static bool reverse_flag_specified = false;
112
113 /* 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 if (ferror(ofp) || fclose(ofp)) {
301 say("Error writing %s\n",
302 TMPOUTNAME);
303 error = 1;
304 }
305 ofp = NULL;
306 }
307 }
308 newwhere = pch_newfirst() + last_offset;
309 if (skip_rest_of_patch) {
310 abort_hunk();
311 failed++;
312 if (verbose)
313 say("Hunk #%d ignored at %ld.\n",
314 hunk, newwhere);
315 } else if (where == 0) {
316 abort_hunk();
317 failed++;
318 if (verbose)
319 say("Hunk #%d failed at %ld.\n",
320 hunk, newwhere);
321 } else {
322 apply_hunk(where);
323 if (verbose) {
324 say("Hunk #%d succeeded at %ld",
325 hunk, newwhere);
326 if (fuzz != 0)
327 say(" with fuzz %ld", fuzz);
328 if (last_offset)
329 say(" (offset %ld line%s)",
330 last_offset,
331 last_offset == 1L ? "" : "s");
332 say(".\n");
333 }
334 }
335 }
336
337 if (out_of_mem && using_plan_a) {
338 Argc = Argc_last;
339 Argv = Argv_last;
340 say("\n\nRan out of memory using Plan A--trying again...\n\n");
341 if (ofp)
342 fclose(ofp);
343 ofp = NULL;
344 if (rejfp)
345 fclose(rejfp);
346 rejfp = NULL;
347 continue;
348 }
349 if (hunk == 0)
350 fatal("Internal error: hunk should not be 0\n");
351
352 /* finish spewing out the new file */
353 if (!skip_rest_of_patch && !spew_output()) {
354 say("Can't write %s\n", TMPOUTNAME);
355 error = 1;
356 }
357
358 /* and put the output where desired */
359 ignore_signals();
360 if (!skip_rest_of_patch) {
361 struct stat statbuf;
362 char *realout = outname;
363
364 if (!check_only) {
365 if (move_file(TMPOUTNAME, outname) < 0) {
366 toutkeep = true;
367 realout = TMPOUTNAME;
368 chmod(TMPOUTNAME, filemode);
369 } else
370 chmod(outname, filemode);
371
372 if (remove_empty_files &&
373 stat(realout, &statbuf) == 0 &&
374 statbuf.st_size == 0) {
375 if (verbose)
376 say("Removing %s (empty after patching).\n",
377 realout);
378 unlink(realout);
379 }
380 }
381 }
382 if (ferror(rejfp) || fclose(rejfp)) {
383 say("Error writing %s\n", rejname);
384 error = 1;
385 }
386 rejfp = NULL;
387 if (failed) {
388 error = 1;
389 if (*rejname == '\0') {
390 if (strlcpy(rejname, outname,
391 sizeof(rejname)) >= sizeof(rejname))
392 fatal("filename %s is too long\n", outname);
393 if (strlcat(rejname, REJEXT,
394 sizeof(rejname)) >= sizeof(rejname))
395 fatal("filename %s is too long\n", outname);
396 }
397 if (skip_rest_of_patch) {
398 say("%d out of %d hunks ignored--saving rejects to %s\n",
399 failed, hunk, rejname);
400 } else {
401 say("%d out of %d hunks failed--saving rejects to %s\n",
402 failed, hunk, rejname);
403 }
404 if (!check_only && move_file(TMPREJNAME, rejname) < 0)
405 trejkeep = true;
406 }
407 set_signals(1);
408 }
409 my_exit(error);
410 /* NOTREACHED */
411 }
412
413 /* Prepare to find the next patch to do in the patch file. */
414
415 static void
416 reinitialize_almost_everything(void)
417 {
418 re_patch();
419 re_input();
420
421 input_lines = 0;
422 last_frozen_line = 0;
423
424 filec = 0;
425 if (!out_of_mem) {
426 free(filearg[0]);
427 filearg[0] = NULL;
428 }
429
430 free(outname);
431 outname = NULL;
432
433 last_offset = 0;
434 diff_type = 0;
435
436 free(revision);
437 revision = NULL;
438
439 reverse = reverse_flag_specified;
440 skip_rest_of_patch = false;
441
442 get_some_switches();
443 }
444
445 /* Process switches and filenames. */
446
447 static void
448 get_some_switches(void)
449 {
450 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:";
451 static struct option longopts[] = {
452 {"backup", no_argument, 0, 'b'},
453 {"batch", no_argument, 0, 't'},
454 {"check", no_argument, 0, 'C'},
455 {"context", no_argument, 0, 'c'},
456 {"debug", required_argument, 0, 'x'},
457 {"directory", required_argument, 0, 'd'},
458 {"ed", no_argument, 0, 'e'},
459 {"force", no_argument, 0, 'f'},
460 {"forward", no_argument, 0, 'N'},
461 {"fuzz", required_argument, 0, 'F'},
462 {"ifdef", required_argument, 0, 'D'},
463 {"input", required_argument, 0, 'i'},
464 {"ignore-whitespace", no_argument, 0, 'l'},
465 {"normal", no_argument, 0, 'n'},
466 {"output", required_argument, 0, 'o'},
467 {"prefix", required_argument, 0, 'B'},
468 {"quiet", no_argument, 0, 's'},
469 {"reject-file", required_argument, 0, 'r'},
470 {"remove-empty-files", no_argument, 0, 'E'},
471 {"reverse", no_argument, 0, 'R'},
472 {"silent", no_argument, 0, 's'},
473 {"strip", required_argument, 0, 'p'},
474 {"suffix", required_argument, 0, 'z'},
475 {"unified", no_argument, 0, 'u'},
476 {"version", no_argument, 0, 'v'},
477 {"version-control", required_argument, 0, 'V'},
478 {"posix", no_argument, &posix, 1},
479 {NULL, 0, 0, 0}
480 };
481 int ch;
482
483 rejname[0] = '\0';
484 Argc_last = Argc;
485 Argv_last = Argv;
486 if (!Argc)
487 return;
488 optreset = optind = 1;
489 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) {
490 switch (ch) {
491 case 'b':
492 if (backup_type == none)
493 backup_type = numbered_existing;
494 if (optarg == NULL)
495 break;
496 if (verbose)
497 say("Warning, the ``-b suffix'' option has been"
498 " obsoleted by the -z option.\n");
499 /* FALLTHROUGH */
500 case 'z':
501 /* must directly follow 'b' case for backwards compat */
502 simple_backup_suffix = savestr(optarg);
503 break;
504 case 'B':
505 origprae = savestr(optarg);
506 break;
507 case 'c':
508 diff_type = CONTEXT_DIFF;
509 break;
510 case 'C':
511 check_only = true;
512 break;
513 case 'd':
514 if (chdir(optarg) < 0)
515 pfatal("can't cd to %s", optarg);
516 break;
517 case 'D':
518 do_defines = true;
519 if (!isalpha((unsigned char)*optarg) && *optarg != '_')
520 fatal("argument to -D is not an identifier\n");
521 snprintf(if_defined, sizeof if_defined,
522 "#ifdef %s\n", optarg);
523 snprintf(not_defined, sizeof not_defined,
524 "#ifndef %s\n", optarg);
525 snprintf(end_defined, sizeof end_defined,
526 "#endif /* %s */\n", optarg);
527 break;
528 case 'e':
529 diff_type = ED_DIFF;
530 break;
531 case 'E':
532 remove_empty_files = true;
533 break;
534 case 'f':
535 force = true;
536 break;
537 case 'F':
538 maxfuzz = atoi(optarg);
539 break;
540 case 'i':
541 if (++filec == MAXFILEC)
542 fatal("too many file arguments\n");
543 filearg[filec] = savestr(optarg);
544 break;
545 case 'l':
546 canonicalize = true;
547 break;
548 case 'n':
549 diff_type = NORMAL_DIFF;
550 break;
551 case 'N':
552 noreverse = true;
553 break;
554 case 'o':
555 outname = savestr(optarg);
556 break;
557 case 'p':
558 strippath = atoi(optarg);
559 break;
560 case 'r':
561 if (strlcpy(rejname, optarg,
562 sizeof(rejname)) >= sizeof(rejname))
563 fatal("argument for -r is too long\n");
564 break;
565 case 'R':
566 reverse = true;
567 reverse_flag_specified = true;
568 break;
569 case 's':
570 verbose = false;
571 break;
572 case 't':
573 batch = true;
574 break;
575 case 'u':
576 diff_type = UNI_DIFF;
577 break;
578 case 'v':
579 version();
580 break;
581 case 'V':
582 backup_type = get_version(optarg);
583 break;
584 #ifdef DEBUGGING
585 case 'x':
586 debug = atoi(optarg);
587 break;
588 #endif
589 default:
590 if (ch != '\0')
591 usage();
592 break;
593 }
594 }
595 Argc -= optind;
596 Argv += optind;
597
598 if (Argc > 0) {
599 filearg[0] = savestr(*Argv++);
600 Argc--;
601 while (Argc > 0) {
602 if (++filec == MAXFILEC)
603 fatal("too many file arguments\n");
604 filearg[filec] = savestr(*Argv++);
605 Argc--;
606 }
607 }
608
609 if (getenv("POSIXLY_CORRECT") != NULL)
610 posix = 1;
611 }
612
613 static void
614 usage(void)
615 {
616 fprintf(stderr,
617 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n"
618 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n"
619 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n"
620 " [--posix] [origfile [patchfile]]\n"
621 " patch <patchfile\n");
622 my_exit(EXIT_SUCCESS);
623 }
624
625 /*
626 * Attempt to find the right place to apply this hunk of patch.
627 */
628 static LINENUM
629 locate_hunk(LINENUM fuzz)
630 {
631 LINENUM first_guess = pch_first() + last_offset;
632 LINENUM offset;
633 LINENUM pat_lines = pch_ptrn_lines();
634 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1;
635 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context();
636
637 if (pat_lines == 0) { /* null range matches always */
638 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF
639 || diff_type == NEW_CONTEXT_DIFF
640 || diff_type == UNI_DIFF)) {
641 say("Empty context always matches.\n");
642 }
643 return (first_guess);
644 }
645 if (max_neg_offset >= first_guess) /* do not try lines < 0 */
646 max_neg_offset = first_guess - 1;
647 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz))
648 return first_guess;
649 for (offset = 1; ; offset++) {
650 bool check_after = (offset <= max_pos_offset);
651 bool check_before = (offset <= max_neg_offset);
652
653 if (check_after && patch_match(first_guess, offset, fuzz)) {
654 #ifdef DEBUGGING
655 if (debug & 1)
656 say("Offset changing from %ld to %ld\n",
657 last_offset, offset);
658 #endif
659 last_offset = offset;
660 return first_guess + offset;
661 } else if (check_before && patch_match(first_guess, -offset, fuzz)) {
662 #ifdef DEBUGGING
663 if (debug & 1)
664 say("Offset changing from %ld to %ld\n",
665 last_offset, -offset);
666 #endif
667 last_offset = -offset;
668 return first_guess - offset;
669 } else if (!check_before && !check_after)
670 return 0;
671 }
672 }
673
674 /* We did not find the pattern, dump out the hunk so they can handle it. */
675
676 static void
677 abort_context_hunk(void)
678 {
679 LINENUM i;
680 const LINENUM pat_end = pch_end();
681 /*
682 * add in last_offset to guess the same as the previous successful
683 * hunk
684 */
685 const LINENUM oldfirst = pch_first() + last_offset;
686 const LINENUM newfirst = pch_newfirst() + last_offset;
687 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1;
688 const LINENUM newlast = newfirst + pch_repl_lines() - 1;
689 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : "");
690 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----");
691
692 fprintf(rejfp, "***************\n");
693 for (i = 0; i <= pat_end; i++) {
694 switch (pch_char(i)) {
695 case '*':
696 if (oldlast < oldfirst)
697 fprintf(rejfp, "*** 0%s\n", stars);
698 else if (oldlast == oldfirst)
699 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars);
700 else
701 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst,
702 oldlast, stars);
703 break;
704 case '=':
705 if (newlast < newfirst)
706 fprintf(rejfp, "--- 0%s\n", minuses);
707 else if (newlast == newfirst)
708 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses);
709 else
710 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst,
711 newlast, minuses);
712 break;
713 case '\n':
714 fprintf(rejfp, "%s", pfetch(i));
715 break;
716 case ' ':
717 case '-':
718 case '+':
719 case '!':
720 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i));
721 break;
722 default:
723 fatal("fatal internal error in abort_context_hunk\n");
724 }
725 }
726 }
727
728 static void
729 rej_line(int ch, LINENUM i)
730 {
731 size_t len;
732 const char *line = pfetch(i);
733
734 len = strlen(line);
735
736 fprintf(rejfp, "%c%s", ch, line);
737 if (len == 0 || line[len-1] != '\n')
738 fprintf(rejfp, "\n\\ No newline at end of file\n");
739 }
740
741 static void
742 abort_hunk(void)
743 {
744 LINENUM i, j, split;
745 int ch1, ch2;
746 const LINENUM pat_end = pch_end();
747 const LINENUM oldfirst = pch_first() + last_offset;
748 const LINENUM newfirst = pch_newfirst() + last_offset;
749
750 if (diff_type != UNI_DIFF) {
751 abort_context_hunk();
752 return;
753 }
754 split = -1;
755 for (i = 0; i <= pat_end; i++) {
756 if (pch_char(i) == '=') {
757 split = i;
758 break;
759 }
760 }
761 if (split == -1) {
762 fprintf(rejfp, "malformed hunk: no split found\n");
763 return;
764 }
765 i = 0;
766 j = split + 1;
767 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n",
768 pch_ptrn_lines() ? oldfirst : 0,
769 pch_ptrn_lines(), newfirst, pch_repl_lines());
770 while (i < split || j <= pat_end) {
771 ch1 = i < split ? pch_char(i) : -1;
772 ch2 = j <= pat_end ? pch_char(j) : -1;
773 if (ch1 == '-') {
774 rej_line('-', i);
775 i++;
776 } else if (ch1 == ' ' && ch2 == ' ') {
777 rej_line(' ', i);
778 i++;
779 j++;
780 } else if (ch1 == '!' && ch2 == '!') {
781 while (i < split && ch1 == '!') {
782 rej_line('-', i);
783 i++;
784 ch1 = i < split ? pch_char(i) : -1;
785 }
786 while (j <= pat_end && ch2 == '!') {
787 rej_line('+', j);
788 j++;
789 ch2 = j <= pat_end ? pch_char(j) : -1;
790 }
791 } else if (ch1 == '*') {
792 i++;
793 } else if (ch2 == '+' || ch2 == ' ') {
794 rej_line(ch2, j);
795 j++;
796 } else {
797 fprintf(rejfp, "internal error on (%ld %ld %ld)\n",
798 i, split, j);
799 rej_line(ch1, i);
800 rej_line(ch2, j);
801 return;
802 }
803 }
804 }
805
806 /* We found where to apply it (we hope), so do it. */
807
808 static void
809 apply_hunk(LINENUM where)
810 {
811 LINENUM old = 1;
812 const LINENUM lastline = pch_ptrn_lines();
813 LINENUM new = lastline + 1;
814 #define OUTSIDE 0
815 #define IN_IFNDEF 1
816 #define IN_IFDEF 2
817 #define IN_ELSE 3
818 int def_state = OUTSIDE;
819 const LINENUM pat_end = pch_end();
820
821 where--;
822 while (pch_char(new) == '=' || pch_char(new) == '\n')
823 new++;
824
825 while (old <= lastline) {
826 if (pch_char(old) == '-') {
827 copy_till(where + old - 1, false);
828 if (do_defines) {
829 if (def_state == OUTSIDE) {
830 fputs(not_defined, ofp);
831 def_state = IN_IFNDEF;
832 } else if (def_state == IN_IFDEF) {
833 fputs(else_defined, ofp);
834 def_state = IN_ELSE;
835 }
836 fputs(pfetch(old), ofp);
837 }
838 last_frozen_line++;
839 old++;
840 } else if (new > pat_end) {
841 break;
842 } else if (pch_char(new) == '+') {
843 copy_till(where + old - 1, false);
844 if (do_defines) {
845 if (def_state == IN_IFNDEF) {
846 fputs(else_defined, ofp);
847 def_state = IN_ELSE;
848 } else if (def_state == OUTSIDE) {
849 fputs(if_defined, ofp);
850 def_state = IN_IFDEF;
851 }
852 }
853 fputs(pfetch(new), ofp);
854 new++;
855 } else if (pch_char(new) != pch_char(old)) {
856 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n",
857 pch_hunk_beg() + old,
858 pch_hunk_beg() + new);
859 #ifdef DEBUGGING
860 say("oldchar = '%c', newchar = '%c'\n",
861 pch_char(old), pch_char(new));
862 #endif
863 my_exit(2);
864 } else if (pch_char(new) == '!') {
865 copy_till(where + old - 1, false);
866 if (do_defines) {
867 fputs(not_defined, ofp);
868 def_state = IN_IFNDEF;
869 }
870 while (pch_char(old) == '!') {
871 if (do_defines) {
872 fputs(pfetch(old), ofp);
873 }
874 last_frozen_line++;
875 old++;
876 }
877 if (do_defines) {
878 fputs(else_defined, ofp);
879 def_state = IN_ELSE;
880 }
881 while (pch_char(new) == '!') {
882 fputs(pfetch(new), ofp);
883 new++;
884 }
885 } else {
886 if (pch_char(new) != ' ')
887 fatal("Internal error: expected ' '\n");
888 old++;
889 new++;
890 if (do_defines && def_state != OUTSIDE) {
891 fputs(end_defined, ofp);
892 def_state = OUTSIDE;
893 }
894 }
895 }
896 if (new <= pat_end && pch_char(new) == '+') {
897 copy_till(where + old - 1, false);
898 if (do_defines) {
899 if (def_state == OUTSIDE) {
900 fputs(if_defined, ofp);
901 def_state = IN_IFDEF;
902 } else if (def_state == IN_IFNDEF) {
903 fputs(else_defined, ofp);
904 def_state = IN_ELSE;
905 }
906 }
907 while (new <= pat_end && pch_char(new) == '+') {
908 fputs(pfetch(new), ofp);
909 new++;
910 }
911 }
912 if (do_defines && def_state != OUTSIDE) {
913 fputs(end_defined, ofp);
914 }
915 }
916
917 /*
918 * Open the new file.
919 */
920 static void
921 init_output(const char *name)
922 {
923 ofp = fopen(name, "w");
924 if (ofp == NULL)
925 pfatal("can't create %s", name);
926 }
927
928 /*
929 * Open a file to put hunks we can't locate.
930 */
931 static void
932 init_reject(const char *name)
933 {
934 rejfp = fopen(name, "w");
935 if (rejfp == NULL)
936 pfatal("can't create %s", name);
937 }
938
939 /*
940 * Copy input file to output, up to wherever hunk is to be applied.
941 * If endoffile is true, treat the last line specially since it may
942 * lack a newline.
943 */
944 static void
945 copy_till(LINENUM lastline, bool endoffile)
946 {
947 if (last_frozen_line > lastline)
948 fatal("misordered hunks! output would be garbled\n");
949 while (last_frozen_line < lastline) {
950 if (++last_frozen_line == lastline && endoffile)
951 dump_line(last_frozen_line, !last_line_missing_eol);
952 else
953 dump_line(last_frozen_line, true);
954 }
955 }
956
957 /*
958 * Finish copying the input file to the output file.
959 */
960 static bool
961 spew_output(void)
962 {
963 int rv;
964
965 #ifdef DEBUGGING
966 if (debug & 256)
967 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line);
968 #endif
969 if (input_lines)
970 copy_till(input_lines, true); /* dump remainder of file */
971 rv = ferror(ofp) == 0 && fclose(ofp) == 0;
972 ofp = NULL;
973 return rv;
974 }
975
976 /*
977 * Copy one line from input to output.
978 */
979 static void
980 dump_line(LINENUM line, bool write_newline)
981 {
982 char *s;
983
984 s = ifetch(line, 0);
985 if (s == NULL)
986 return;
987 /* Note: string is not NUL terminated. */
988 for (; *s != '\n'; s++)
989 putc(*s, ofp);
990 if (write_newline)
991 putc('\n', ofp);
992 }
993
994 /*
995 * Does the patch pattern match at line base+offset?
996 */
997 static bool
998 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz)
999 {
1000 LINENUM pline = 1 + fuzz;
1001 LINENUM iline;
1002 LINENUM pat_lines = pch_ptrn_lines() - fuzz;
1003 const char *ilineptr;
1004 const char *plineptr;
1005 short plinelen;
1006
1007 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) {
1008 ilineptr = ifetch(iline, offset >= 0);
1009 if (ilineptr == NULL)
1010 return false;
1011 plineptr = pfetch(pline);
1012 plinelen = pch_line_len(pline);
1013 if (canonicalize) {
1014 if (!similar(ilineptr, plineptr, plinelen))
1015 return false;
1016 } else if (strnNE(ilineptr, plineptr, plinelen))
1017 return false;
1018 if (iline == input_lines) {
1019 /*
1020 * We are looking at the last line of the file.
1021 * If the file has no eol, the patch line should
1022 * not have one either and vice-versa. Note that
1023 * plinelen > 0.
1024 */
1025 if (last_line_missing_eol) {
1026 if (plineptr[plinelen - 1] == '\n')
1027 return false;
1028 } else {
1029 if (plineptr[plinelen - 1] != '\n')
1030 return false;
1031 }
1032 }
1033 }
1034 return true;
1035 }
1036
1037 /*
1038 * Do two lines match with canonicalized white space?
1039 */
1040 static bool
1041 similar(const char *a, const char *b, int len)
1042 {
1043 while (len) {
1044 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */
1045 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */
1046 return false;
1047 while (len && isspace((unsigned char)*b) && *b != '\n')
1048 b++, len--; /* skip pattern whitespace */
1049 while (isspace((unsigned char)*a) && *a != '\n')
1050 a++; /* skip target whitespace */
1051 if (*a == '\n' || *b == '\n')
1052 return (*a == *b); /* should end in sync */
1053 } else if (*a++ != *b++) /* match non-whitespace chars */
1054 return false;
1055 else
1056 len--; /* probably not necessary */
1057 }
1058 return true; /* actually, this is not reached */
1059 /* since there is always a \n */
1060 }
DragonFly BSD