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[apple_cmds.git] / patch_cmds / patch / patch.c
1 /* $OpenBSD: patch.c,v 1.48 2009/10/27 23:59:41 deraadt Exp $ */
2
3 /*
4 * patch - a program to apply diffs to original files
5 *
6 * Copyright 1986, Larry Wall
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following condition is met:
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this condition and the following disclaimer.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
17 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 * -C option added in 1998, original code by Marc Espie, based on FreeBSD
26 * behaviour
27 */
28
29 #include <sys/types.h>
30 #include <sys/stat.h>
31 #include <unistd.h>
32
33 #include <ctype.h>
34 #include <getopt.h>
35 #include <limits.h>
36 #include <stdio.h>
37 #include <string.h>
38 #include <stdlib.h>
39
40 #include "common.h"
41 #include "util.h"
42 #include "pch.h"
43 #include "inp.h"
44 #include "backupfile.h"
45 #include "pathnames.h"
46
47 mode_t filemode = 0644;
48
49 char buf[MAXLINELEN]; /* general purpose buffer */
50
51 bool using_plan_a = true; /* try to keep everything in memory */
52 bool out_of_mem = false; /* ran out of memory in plan a */
53
54 #define MAXFILEC 2
55
56 char *filearg[MAXFILEC];
57 bool ok_to_create_file = false;
58 char *outname = NULL;
59 char *origprae = NULL;
60 char *TMPOUTNAME;
61 char *TMPINNAME;
62 char *TMPREJNAME;
63 char *TMPPATNAME;
64 bool toutkeep = false;
65 bool trejkeep = false;
66 bool warn_on_invalid_line;
67 bool last_line_missing_eol;
68
69 #ifdef DEBUGGING
70 int debug = 0;
71 #endif
72
73 bool force = false;
74 bool batch = false;
75 int verbose = false;
76 bool reverse = false;
77 bool noreverse = false;
78 bool skip_rest_of_patch = false;
79 int strippath = 957;
80 bool canonicalize = false;
81 bool check_only = false;
82 int diff_type = 0;
83 char *revision = NULL; /* prerequisite revision, if any */
84 LINENUM input_lines = 0; /* how long is input file in lines */
85 int posix = 0; /* strict POSIX mode? */
86
87 static void reinitialize_almost_everything(void);
88 static void get_some_switches(void);
89 static LINENUM locate_hunk(LINENUM);
90 static void abort_context_hunk(void);
91 static void rej_line(int, LINENUM);
92 static void abort_hunk(void);
93 static void apply_hunk(LINENUM);
94 static void init_output(const char *);
95 static void init_reject(const char *);
96 static void copy_till(LINENUM, bool);
97 static void spew_output(void);
98 static void dump_line(LINENUM, bool);
99 static bool patch_match(LINENUM, LINENUM, LINENUM);
100 static bool similar(const char *, const char *, int);
101 static __dead void usage(void);
102
103 /* true if -E was specified on command line. */
104 static bool remove_empty_files = false;
105
106 /* true if -R was specified on command line. */
107 static bool reverse_flag_specified = false;
108
109 /* buffer holding the name of the rejected patch file. */
110 static char rejname[NAME_MAX + 1];
111
112 /* buffer for stderr */
113 static char serrbuf[BUFSIZ];
114
115 /* how many input lines have been irretractibly output */
116 static LINENUM last_frozen_line = 0;
117
118 static int Argc; /* guess */
119 static char **Argv;
120 static int Argc_last; /* for restarting plan_b */
121 static char **Argv_last;
122
123 static FILE *ofp = NULL; /* output file pointer */
124 static FILE *rejfp = NULL; /* reject file pointer */
125
126 static int filec = 0; /* how many file arguments? */
127 static LINENUM last_offset = 0;
128 static LINENUM maxfuzz = 2;
129
130 /* patch using ifdef, ifndef, etc. */
131 static bool do_defines = false;
132 /* #ifdef xyzzy */
133 static char if_defined[128];
134 /* #ifndef xyzzy */
135 static char not_defined[128];
136 /* #else */
137 static const char else_defined[] = "#else\n";
138 /* #endif xyzzy */
139 static char end_defined[128];
140
141
142 /* Apply a set of diffs as appropriate. */
143
144 int
145 main(int argc, char *argv[])
146 {
147 int error = 0, hunk, failed, i, fd;
148 bool patch_seen;
149 LINENUM where = 0, newwhere, fuzz, mymaxfuzz;
150 const char *tmpdir;
151 char *v;
152
153 setbuf(stderr, serrbuf);
154 for (i = 0; i < MAXFILEC; i++)
155 filearg[i] = NULL;
156
157 /* Cons up the names of the temporary files. */
158 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0')
159 tmpdir = _PATH_TMP;
160 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--)
161 ;
162 i++;
163 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1)
164 fatal("cannot allocate memory");
165 if ((fd = mkstemp(TMPOUTNAME)) < 0)
166 pfatal("can't create %s", TMPOUTNAME);
167 close(fd);
168
169 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1)
170 fatal("cannot allocate memory");
171 if ((fd = mkstemp(TMPINNAME)) < 0)
172 pfatal("can't create %s", TMPINNAME);
173 close(fd);
174
175 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1)
176 fatal("cannot allocate memory");
177 if ((fd = mkstemp(TMPREJNAME)) < 0)
178 pfatal("can't create %s", TMPREJNAME);
179 close(fd);
180
181 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1)
182 fatal("cannot allocate memory");
183 if ((fd = mkstemp(TMPPATNAME)) < 0)
184 pfatal("can't create %s", TMPPATNAME);
185 close(fd);
186
187 v = getenv("SIMPLE_BACKUP_SUFFIX");
188 if (v)
189 simple_backup_suffix = v;
190 else
191 simple_backup_suffix = ORIGEXT;
192
193 /* parse switches */
194 Argc = argc;
195 Argv = argv;
196 get_some_switches();
197
198 if (backup_type == none) {
199 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL)
200 v = getenv("VERSION_CONTROL");
201 if (v != NULL || !posix)
202 backup_type = get_version(v); /* OK to pass NULL. */
203 }
204
205 /* make sure we clean up /tmp in case of disaster */
206 set_signals(0);
207
208 patch_seen = false;
209 for (open_patch_file(filearg[1]); there_is_another_patch();
210 reinitialize_almost_everything()) {
211 /* for each patch in patch file */
212
213 patch_seen = true;
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
401 if (!patch_seen)
402 error = 2;
403
404 my_exit(error);
405 /* NOTREACHED */
406 }
407
408 /* Prepare to find the next patch to do in the patch file. */
409
410 static void
411 reinitialize_almost_everything(void)
412 {
413 re_patch();
414 re_input();
415
416 input_lines = 0;
417 last_frozen_line = 0;
418
419 filec = 0;
420 if (!out_of_mem) {
421 free(filearg[0]);
422 filearg[0] = NULL;
423 }
424
425 free(outname);
426 outname = NULL;
427
428 last_offset = 0;
429 diff_type = 0;
430
431 free(revision);
432 revision = NULL;
433
434 reverse = reverse_flag_specified;
435 skip_rest_of_patch = false;
436
437 get_some_switches();
438 }
439
440 /* Process switches and filenames. */
441
442 static void
443 get_some_switches(void)
444 {
445 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:";
446 static struct option longopts[] = {
447 {"backup", no_argument, 0, 'b'},
448 {"batch", no_argument, 0, 't'},
449 {"binary", no_argument, 0, 1},
450 {"check", no_argument, 0, 'C'},
451 {"context", no_argument, 0, 'c'},
452 {"debug", required_argument, 0, 'x'},
453 {"directory", required_argument, 0, 'd'},
454 {"dry-run", no_argument, 0, 'C'},
455 {"ed", no_argument, 0, 'e'},
456 {"force", no_argument, 0, 'f'},
457 {"forward", no_argument, 0, 'N'},
458 {"fuzz", required_argument, 0, 'F'},
459 {"ifdef", required_argument, 0, 'D'},
460 {"input", required_argument, 0, 'i'},
461 {"ignore-whitespace", no_argument, 0, 'l'},
462 {"normal", no_argument, 0, 'n'},
463 {"output", required_argument, 0, 'o'},
464 {"prefix", required_argument, 0, 'B'},
465 {"quiet", no_argument, 0, 's'},
466 {"reject-file", required_argument, 0, 'r'},
467 {"remove-empty-files", no_argument, 0, 'E'},
468 {"reverse", no_argument, 0, 'R'},
469 {"silent", no_argument, 0, 's'},
470 {"strip", required_argument, 0, 'p'},
471 {"suffix", required_argument, 0, 'z'},
472 {"unified", no_argument, 0, 'u'},
473 {"version", no_argument, 0, 'v'},
474 {"version-control", required_argument, 0, 'V'},
475 {"posix", no_argument, &posix, 1},
476 {"verbose", no_argument, &verbose, true},
477 {NULL, 0, 0, 0}
478 };
479 int ch;
480
481 rejname[0] = '\0';
482 Argc_last = Argc;
483 Argv_last = Argv;
484 if (!Argc)
485 return;
486 optreset = optind = 1;
487 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) {
488 switch (ch) {
489 case 'b':
490 if (backup_type == none)
491 backup_type = numbered_existing;
492 if (optarg == NULL)
493 break;
494 if (verbose)
495 say("Warning, the ``-b suffix'' option has been"
496 " obsoleted by the -z option.\n");
497 /* FALLTHROUGH */
498 case 'z':
499 /* must directly follow 'b' case for backwards compat */
500 simple_backup_suffix = savestr(optarg);
501 break;
502 case 'B':
503 origprae = savestr(optarg);
504 break;
505 case 'c':
506 diff_type = CONTEXT_DIFF;
507 break;
508 case 'C':
509 check_only = true;
510 break;
511 case 'd':
512 if (chdir(optarg) < 0)
513 pfatal("can't cd to %s", optarg);
514 break;
515 case 'D':
516 do_defines = true;
517 if (!isalpha(*optarg) && *optarg != '_')
518 fatal("argument to -D is not an identifier\n");
519 snprintf(if_defined, sizeof if_defined,
520 "#ifdef %s\n", optarg);
521 snprintf(not_defined, sizeof not_defined,
522 "#ifndef %s\n", optarg);
523 snprintf(end_defined, sizeof end_defined,
524 "#endif /* %s */\n", optarg);
525 break;
526 case 'e':
527 diff_type = ED_DIFF;
528 break;
529 case 'E':
530 remove_empty_files = true;
531 break;
532 case 'f':
533 force = true;
534 break;
535 case 'F':
536 maxfuzz = atoi(optarg);
537 break;
538 case 'i':
539 if (++filec == MAXFILEC)
540 fatal("too many file arguments\n");
541 filearg[filec] = savestr(optarg);
542 break;
543 case 'l':
544 canonicalize = true;
545 break;
546 case 'n':
547 diff_type = NORMAL_DIFF;
548 break;
549 case 'N':
550 noreverse = true;
551 break;
552 case 'o':
553 outname = savestr(optarg);
554 break;
555 case 'p':
556 strippath = atoi(optarg);
557 break;
558 case 'r':
559 if (strlcpy(rejname, optarg,
560 sizeof(rejname)) >= sizeof(rejname))
561 fatal("argument for -r is too long\n");
562 break;
563 case 'R':
564 reverse = true;
565 reverse_flag_specified = true;
566 break;
567 case 's':
568 verbose = false;
569 break;
570 case 't':
571 batch = true;
572 break;
573 case 'u':
574 diff_type = UNI_DIFF;
575 break;
576 case 'v':
577 version();
578 break;
579 case 'V':
580 backup_type = get_version(optarg);
581 break;
582 #ifdef DEBUGGING
583 case 'x':
584 debug = atoi(optarg);
585 break;
586 #endif
587 case 1:
588 /* ignored */
589 break;
590 default:
591 if (ch != '\0')
592 usage();
593 break;
594 }
595 }
596 Argc -= optind;
597 Argv += optind;
598
599 if (Argc > 0) {
600 filearg[0] = savestr(*Argv++);
601 Argc--;
602 while (Argc > 0) {
603 if (++filec == MAXFILEC)
604 fatal("too many file arguments\n");
605 filearg[filec] = savestr(*Argv++);
606 Argc--;
607 }
608 }
609
610 if (getenv("POSIXLY_CORRECT") != NULL)
611 posix = 1;
612 }
613
614 static __dead void
615 usage(void)
616 {
617 fprintf(stderr,
618 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n"
619 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n"
620 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n"
621 " [--posix] [origfile [patchfile]]\n"
622 " patch <patchfile\n");
623 my_exit(EXIT_SUCCESS);
624 }
625
626 /*
627 * Attempt to find the right place to apply this hunk of patch.
628 */
629 static LINENUM
630 locate_hunk(LINENUM fuzz)
631 {
632 LINENUM first_guess = pch_first() + last_offset;
633 LINENUM offset;
634 LINENUM pat_lines = pch_ptrn_lines();
635 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1;
636 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context();
637
638 if (pat_lines == 0) { /* null range matches always */
639 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF
640 || diff_type == NEW_CONTEXT_DIFF
641 || diff_type == UNI_DIFF)) {
642 say("Empty context always matches.\n");
643 }
644 return (first_guess);
645 }
646 if (max_neg_offset >= first_guess) /* do not try lines < 0 */
647 max_neg_offset = first_guess - 1;
648 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz))
649 return first_guess;
650 for (offset = 1; ; offset++) {
651 bool check_after = (offset <= max_pos_offset);
652 bool check_before = (offset <= max_neg_offset);
653
654 if (check_after && patch_match(first_guess, offset, fuzz)) {
655 #ifdef DEBUGGING
656 if (debug & 1)
657 say("Offset changing from %ld to %ld\n",
658 last_offset, offset);
659 #endif
660 last_offset = offset;
661 return first_guess + offset;
662 } else if (check_before && patch_match(first_guess, -offset, fuzz)) {
663 #ifdef DEBUGGING
664 if (debug & 1)
665 say("Offset changing from %ld to %ld\n",
666 last_offset, -offset);
667 #endif
668 last_offset = -offset;
669 return first_guess - offset;
670 } else if (!check_before && !check_after)
671 return 0;
672 }
673 }
674
675 /* We did not find the pattern, dump out the hunk so they can handle it. */
676
677 static void
678 abort_context_hunk(void)
679 {
680 LINENUM i;
681 const LINENUM pat_end = pch_end();
682 /*
683 * add in last_offset to guess the same as the previous successful
684 * hunk
685 */
686 const LINENUM oldfirst = pch_first() + last_offset;
687 const LINENUM newfirst = pch_newfirst() + last_offset;
688 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1;
689 const LINENUM newlast = newfirst + pch_repl_lines() - 1;
690 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : "");
691 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----");
692
693 fprintf(rejfp, "***************\n");
694 for (i = 0; i <= pat_end; i++) {
695 switch (pch_char(i)) {
696 case '*':
697 if (oldlast < oldfirst)
698 fprintf(rejfp, "*** 0%s\n", stars);
699 else if (oldlast == oldfirst)
700 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars);
701 else
702 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst,
703 oldlast, stars);
704 break;
705 case '=':
706 if (newlast < newfirst)
707 fprintf(rejfp, "--- 0%s\n", minuses);
708 else if (newlast == newfirst)
709 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses);
710 else
711 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst,
712 newlast, minuses);
713 break;
714 case '\n':
715 fprintf(rejfp, "%s", pfetch(i));
716 break;
717 case ' ':
718 case '-':
719 case '+':
720 case '!':
721 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i));
722 break;
723 default:
724 fatal("fatal internal error in abort_context_hunk\n");
725 }
726 }
727 }
728
729 static void
730 rej_line(int ch, LINENUM i)
731 {
732 size_t len;
733 const char *line = pfetch(i);
734
735 len = strlen(line);
736
737 fprintf(rejfp, "%c%s", ch, line);
738 if (len == 0 || line[len-1] != '\n')
739 fprintf(rejfp, "\n\\ No newline at end of file\n");
740 }
741
742 static void
743 abort_hunk(void)
744 {
745 LINENUM i, j, split;
746 int ch1, ch2;
747 const LINENUM pat_end = pch_end();
748 const LINENUM oldfirst = pch_first() + last_offset;
749 const LINENUM newfirst = pch_newfirst() + last_offset;
750
751 if (diff_type != UNI_DIFF) {
752 abort_context_hunk();
753 return;
754 }
755 split = -1;
756 for (i = 0; i <= pat_end; i++) {
757 if (pch_char(i) == '=') {
758 split = i;
759 break;
760 }
761 }
762 if (split == -1) {
763 fprintf(rejfp, "malformed hunk: no split found\n");
764 return;
765 }
766 i = 0;
767 j = split + 1;
768 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n",
769 pch_ptrn_lines() ? oldfirst : 0,
770 pch_ptrn_lines(), newfirst, pch_repl_lines());
771 while (i < split || j <= pat_end) {
772 ch1 = i < split ? pch_char(i) : -1;
773 ch2 = j <= pat_end ? pch_char(j) : -1;
774 if (ch1 == '-') {
775 rej_line('-', i);
776 i++;
777 } else if (ch1 == ' ' && ch2 == ' ') {
778 rej_line(' ', i);
779 i++;
780 j++;
781 } else if (ch1 == '!' && ch2 == '!') {
782 while (i < split && ch1 == '!') {
783 rej_line('-', i);
784 i++;
785 ch1 = i < split ? pch_char(i) : -1;
786 }
787 while (j <= pat_end && ch2 == '!') {
788 rej_line('+', j);
789 j++;
790 ch2 = j <= pat_end ? pch_char(j) : -1;
791 }
792 } else if (ch1 == '*') {
793 i++;
794 } else if (ch2 == '+' || ch2 == ' ') {
795 rej_line(ch2, j);
796 j++;
797 } else {
798 fprintf(rejfp, "internal error on (%ld %ld %ld)\n",
799 i, split, j);
800 rej_line(ch1, i);
801 rej_line(ch2, j);
802 return;
803 }
804 }
805 }
806
807 /* We found where to apply it (we hope), so do it. */
808
809 static void
810 apply_hunk(LINENUM where)
811 {
812 LINENUM old = 1;
813 const LINENUM lastline = pch_ptrn_lines();
814 LINENUM new = lastline + 1;
815 #define OUTSIDE 0
816 #define IN_IFNDEF 1
817 #define IN_IFDEF 2
818 #define IN_ELSE 3
819 int def_state = OUTSIDE;
820 const LINENUM pat_end = pch_end();
821
822 where--;
823 while (pch_char(new) == '=' || pch_char(new) == '\n')
824 new++;
825
826 while (old <= lastline) {
827 if (pch_char(old) == '-') {
828 copy_till(where + old - 1, false);
829 if (do_defines) {
830 if (def_state == OUTSIDE) {
831 fputs(not_defined, ofp);
832 def_state = IN_IFNDEF;
833 } else if (def_state == IN_IFDEF) {
834 fputs(else_defined, ofp);
835 def_state = IN_ELSE;
836 }
837 fputs(pfetch(old), ofp);
838 }
839 last_frozen_line++;
840 old++;
841 } else if (new > pat_end) {
842 break;
843 } else if (pch_char(new) == '+') {
844 copy_till(where + old - 1, false);
845 if (do_defines) {
846 if (def_state == IN_IFNDEF) {
847 fputs(else_defined, ofp);
848 def_state = IN_ELSE;
849 } else if (def_state == OUTSIDE) {
850 fputs(if_defined, ofp);
851 def_state = IN_IFDEF;
852 }
853 }
854 fputs(pfetch(new), ofp);
855 new++;
856 } else if (pch_char(new) != pch_char(old)) {
857 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n",
858 pch_hunk_beg() + old,
859 pch_hunk_beg() + new);
860 #ifdef DEBUGGING
861 say("oldchar = '%c', newchar = '%c'\n",
862 pch_char(old), pch_char(new));
863 #endif
864 my_exit(2);
865 } else if (pch_char(new) == '!') {
866 copy_till(where + old - 1, false);
867 if (do_defines) {
868 fputs(not_defined, ofp);
869 def_state = IN_IFNDEF;
870 }
871 while (pch_char(old) == '!') {
872 if (do_defines) {
873 fputs(pfetch(old), ofp);
874 }
875 last_frozen_line++;
876 old++;
877 }
878 if (do_defines) {
879 fputs(else_defined, ofp);
880 def_state = IN_ELSE;
881 }
882 while (pch_char(new) == '!') {
883 fputs(pfetch(new), ofp);
884 new++;
885 }
886 } else {
887 if (pch_char(new) != ' ')
888 fatal("Internal error: expected ' '\n");
889 old++;
890 new++;
891 if (do_defines && def_state != OUTSIDE) {
892 fputs(end_defined, ofp);
893 def_state = OUTSIDE;
894 }
895 }
896 }
897 if (new <= pat_end && pch_char(new) == '+') {
898 copy_till(where + old - 1, false);
899 if (do_defines) {
900 if (def_state == OUTSIDE) {
901 fputs(if_defined, ofp);
902 def_state = IN_IFDEF;
903 } else if (def_state == IN_IFNDEF) {
904 fputs(else_defined, ofp);
905 def_state = IN_ELSE;
906 }
907 }
908 while (new <= pat_end && pch_char(new) == '+') {
909 fputs(pfetch(new), ofp);
910 new++;
911 }
912 }
913 if (do_defines && def_state != OUTSIDE) {
914 fputs(end_defined, ofp);
915 }
916 }
917
918 /*
919 * Open the new file.
920 */
921 static void
922 init_output(const char *name)
923 {
924 ofp = fopen(name, "w");
925 if (ofp == NULL)
926 pfatal("can't create %s", name);
927 }
928
929 /*
930 * Open a file to put hunks we can't locate.
931 */
932 static void
933 init_reject(const char *name)
934 {
935 rejfp = fopen(name, "w");
936 if (rejfp == NULL)
937 pfatal("can't create %s", name);
938 }
939
940 /*
941 * Copy input file to output, up to wherever hunk is to be applied.
942 * If endoffile is true, treat the last line specially since it may
943 * lack a newline.
944 */
945 static void
946 copy_till(LINENUM lastline, bool endoffile)
947 {
948 if (last_frozen_line > lastline)
949 fatal("misordered hunks! output would be garbled\n");
950 while (last_frozen_line < lastline) {
951 if (++last_frozen_line == lastline && endoffile)
952 dump_line(last_frozen_line, !last_line_missing_eol);
953 else
954 dump_line(last_frozen_line, true);
955 }
956 }
957
958 /*
959 * Finish copying the input file to the output file.
960 */
961 static void
962 spew_output(void)
963 {
964 #ifdef DEBUGGING
965 if (debug & 256)
966 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line);
967 #endif
968 if (input_lines)
969 copy_till(input_lines, true); /* dump remainder of file */
970 fclose(ofp);
971 ofp = NULL;
972 }
973
974 /*
975 * Copy one line from input to output.
976 */
977 static void
978 dump_line(LINENUM line, bool write_newline)
979 {
980 char *s;
981
982 s = ifetch(line, 0);
983 if (s == NULL)
984 return;
985 /* Note: string is not NUL terminated. */
986 for (; *s != '\n'; s++)
987 putc(*s, ofp);
988 if (write_newline)
989 putc('\n', ofp);
990 }
991
992 /*
993 * Does the patch pattern match at line base+offset?
994 */
995 static bool
996 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz)
997 {
998 LINENUM pline = 1 + fuzz;
999 LINENUM iline;
1000 LINENUM pat_lines = pch_ptrn_lines() - fuzz;
1001 const char *ilineptr;
1002 const char *plineptr;
1003 short plinelen;
1004
1005 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) {
1006 ilineptr = ifetch(iline, offset >= 0);
1007 if (ilineptr == NULL)
1008 return false;
1009 plineptr = pfetch(pline);
1010 plinelen = pch_line_len(pline);
1011 if (canonicalize) {
1012 if (!similar(ilineptr, plineptr, plinelen))
1013 return false;
1014 } else if (strnNE(ilineptr, plineptr, plinelen))
1015 return false;
1016 if (iline == input_lines) {
1017 /*
1018 * We are looking at the last line of the file.
1019 * If the file has no eol, the patch line should
1020 * not have one either and vice-versa. Note that
1021 * plinelen > 0.
1022 */
1023 if (last_line_missing_eol) {
1024 if (plineptr[plinelen - 1] == '\n')
1025 return false;
1026 } else {
1027 if (plineptr[plinelen - 1] != '\n')
1028 return false;
1029 }
1030 }
1031 }
1032 return true;
1033 }
1034
1035 /*
1036 * Do two lines match with canonicalized white space?
1037 */
1038 static bool
1039 similar(const char *a, const char *b, int len)
1040 {
1041 while (len) {
1042 if (isspace(*b)) { /* whitespace (or \n) to match? */
1043 if (!isspace(*a)) /* no corresponding whitespace? */
1044 return false;
1045 while (len && isspace(*b) && *b != '\n')
1046 b++, len--; /* skip pattern whitespace */
1047 while (isspace(*a) && *a != '\n')
1048 a++; /* skip target whitespace */
1049 if (*a == '\n' || *b == '\n')
1050 return (*a == *b); /* should end in sync */
1051 } else if (*a++ != *b++) /* match non-whitespace chars */
1052 return false;
1053 else
1054 len--; /* probably not necessary */
1055 }
1056 return true; /* actually, this is not reached */
1057 /* since there is always a \n */
1058 }
WIP BSD Userland for iOS