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[dragonfly.git] / usr.bin / patch / pch.c
blob97d43bd184a75c17cb286117137f91e7dc82e731
1
2 /*-
3 * Copyright 1986, Larry Wall
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following condition is met:
7 * 1. Redistributions of source code must retain the above copyright notice,
8 * this condition and the following disclaimer.
9 *
10 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
11 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
12 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
13 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
14 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
15 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
16 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
17 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
18 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
19 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
20 * SUCH DAMAGE.
21 *
22 * patch - a program to apply diffs to original files
23 *
24 * -C option added in 1998, original code by Marc Espie, based on FreeBSD
25 * behaviour
26 *
27 * $OpenBSD: pch.c,v 1.39 2012/04/11 08:07:13 ajacoutot Exp $
28 * $FreeBSD: head/usr.bin/patch/pch.c 255232 2013-09-05 05:51:15Z se $
29 */
30
31 #include <sys/types.h>
32 #include <sys/stat.h>
33
34 #include <ctype.h>
35 #include <libgen.h>
36 #include <limits.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41
42 #include "common.h"
43 #include "util.h"
44 #include "pch.h"
45 #include "pathnames.h"
46
47 /* Patch (diff listing) abstract type. */
48
49 static long p_filesize; /* size of the patch file */
50 static LINENUM p_first; /* 1st line number */
51 static LINENUM p_newfirst; /* 1st line number of replacement */
52 static LINENUM p_ptrn_lines; /* # lines in pattern */
53 static LINENUM p_repl_lines; /* # lines in replacement text */
54 static LINENUM p_end = -1; /* last line in hunk */
55 static LINENUM p_max; /* max allowed value of p_end */
56 static LINENUM p_context = 3; /* # of context lines */
57 static LINENUM p_input_line = 0; /* current line # from patch file */
58 static char **p_line = NULL;/* the text of the hunk */
59 static size_t *p_len = NULL; /* length of each line */
60 static char *p_char = NULL; /* +, -, and ! */
61 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */
62 static int p_indent; /* indent to patch */
63 static LINENUM p_base; /* where to intuit this time */
64 static LINENUM p_bline; /* line # of p_base */
65 static LINENUM p_start; /* where intuit found a patch */
66 static LINENUM p_sline; /* and the line number for it */
67 static LINENUM p_hunk_beg; /* line number of current hunk */
68 static LINENUM p_efake = -1; /* end of faked up lines--don't free */
69 static LINENUM p_bfake = -1; /* beg of faked up lines */
70 static FILE *pfp = NULL; /* patch file pointer */
71 static char *bestguess = NULL; /* guess at correct filename */
72
73 static void grow_hunkmax(void);
74 static int intuit_diff_type(void);
75 static void next_intuit_at(LINENUM, LINENUM);
76 static void skip_to(LINENUM, LINENUM);
77 static size_t pgets(bool _do_indent);
78 static char *best_name(const struct file_name *, bool);
79 static char *posix_name(const struct file_name *, bool);
80 static size_t num_components(const char *);
81
82 /*
83 * Prepare to look for the next patch in the patch file.
84 */
85 void
86 re_patch(void)
87 {
88 p_first = 0;
89 p_newfirst = 0;
90 p_ptrn_lines = 0;
91 p_repl_lines = 0;
92 p_end = (LINENUM) - 1;
93 p_max = 0;
94 p_indent = 0;
95 }
96
97 /*
98 * Open the patch file at the beginning of time.
99 */
100 void
101 open_patch_file(const char *filename)
102 {
103 struct stat filestat;
104 int nr, nw;
105
106 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) {
107 pfp = fopen(TMPPATNAME, "w");
108 if (pfp == NULL)
109 pfatal("can't create %s", TMPPATNAME);
110 while ((nr = fread(buf, 1, buf_size, stdin)) > 0) {
111 nw = fwrite(buf, 1, nr, pfp);
112 if (nr != nw)
113 pfatal("write error to %s", TMPPATNAME);
114 }
115 if (ferror(pfp) || fclose(pfp))
116 pfatal("can't write %s", TMPPATNAME);
117 filename = TMPPATNAME;
118 }
119 pfp = fopen(filename, "r");
120 if (pfp == NULL)
121 pfatal("patch file %s not found", filename);
122 fstat(fileno(pfp), &filestat);
123 p_filesize = filestat.st_size;
124 next_intuit_at(0L, 1L); /* start at the beginning */
125 set_hunkmax();
126 }
127
128 /*
129 * Make sure our dynamically realloced tables are malloced to begin with.
130 */
131 void
132 set_hunkmax(void)
133 {
134 if (p_line == NULL)
135 p_line = calloc((size_t) hunkmax, sizeof(char *));
136 if (p_len == NULL)
137 p_len = calloc((size_t) hunkmax, sizeof(size_t));
138 if (p_char == NULL)
139 p_char = calloc((size_t) hunkmax, sizeof(char));
140 }
141
142 /*
143 * Enlarge the arrays containing the current hunk of patch.
144 */
145 static void
146 grow_hunkmax(void)
147 {
148 int new_hunkmax;
149 char **new_p_line;
150 size_t *new_p_len;
151 char *new_p_char;
152
153 new_hunkmax = hunkmax * 2;
154
155 if (p_line == NULL || p_len == NULL || p_char == NULL)
156 fatal("Internal memory allocation error\n");
157
158 new_p_line = realloc(p_line, new_hunkmax * sizeof(char *));
159 if (new_p_line == NULL)
160 free(p_line);
161
162 new_p_len = realloc(p_len, new_hunkmax * sizeof(size_t));
163 if (new_p_len == NULL)
164 free(p_len);
165
166 new_p_char = realloc(p_char, new_hunkmax * sizeof(char));
167 if (new_p_char == NULL)
168 free(p_char);
169
170 p_char = new_p_char;
171 p_len = new_p_len;
172 p_line = new_p_line;
173
174 if (p_line != NULL && p_len != NULL && p_char != NULL) {
175 hunkmax = new_hunkmax;
176 return;
177 }
178
179 if (!using_plan_a)
180 fatal("out of memory\n");
181 out_of_mem = true; /* whatever is null will be allocated again */
182 /* from within plan_a(), of all places */
183 }
184
185 /* True if the remainder of the patch file contains a diff of some sort. */
186
187 bool
188 there_is_another_patch(void)
189 {
190 bool exists = false;
191
192 if (p_base != 0L && p_base >= p_filesize) {
193 if (verbose)
194 say("done\n");
195 return false;
196 }
197 if (verbose)
198 say("Hmm...");
199 diff_type = intuit_diff_type();
200 if (!diff_type) {
201 if (p_base != 0L) {
202 if (verbose)
203 say(" Ignoring the trailing garbage.\ndone\n");
204 } else
205 say(" I can't seem to find a patch in there anywhere.\n");
206 return false;
207 }
208 if (verbose)
209 say(" %sooks like %s to me...\n",
210 (p_base == 0L ? "L" : "The next patch l"),
211 diff_type == UNI_DIFF ? "a unified diff" :
212 diff_type == CONTEXT_DIFF ? "a context diff" :
213 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" :
214 diff_type == NORMAL_DIFF ? "a normal diff" :
215 "an ed script");
216 if (p_indent && verbose)
217 say("(Patch is indented %d space%s.)\n", p_indent,
218 p_indent == 1 ? "" : "s");
219 skip_to(p_start, p_sline);
220 while (filearg[0] == NULL) {
221 if (force || batch) {
222 say("No file to patch. Skipping...\n");
223 filearg[0] = savestr(bestguess);
224 skip_rest_of_patch = true;
225 return true;
226 }
227 ask("File to patch: ");
228 if (*buf != '\n') {
229 free(bestguess);
230 bestguess = savestr(buf);
231 filearg[0] = fetchname(buf, &exists, 0);
232 }
233 if (!exists) {
234 ask("No file found--skip this patch? [n] ");
235 if (*buf != 'y')
236 continue;
237 if (verbose)
238 say("Skipping patch...\n");
239 free(filearg[0]);
240 filearg[0] = fetchname(bestguess, &exists, 0);
241 skip_rest_of_patch = true;
242 return true;
243 }
244 }
245 return true;
246 }
247
248 static void
249 p4_fetchname(struct file_name *name, char *str)
250 {
251 char *t, *h;
252
253 /* Skip leading whitespace. */
254 while (isspace((unsigned char)*str))
255 str++;
256
257 /* Remove the file revision number. */
258 for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++)
259 if (*t == '#')
260 h = t;
261 if (h != NULL)
262 *h = '\0';
263
264 name->path = fetchname(str, &name->exists, strippath);
265 }
266
267 /* Determine what kind of diff is in the remaining part of the patch file. */
268
269 static int
270 intuit_diff_type(void)
271 {
272 long this_line = 0, previous_line;
273 long first_command_line = -1;
274 LINENUM fcl_line = -1;
275 bool last_line_was_command = false, this_is_a_command = false;
276 bool stars_last_line = false, stars_this_line = false;
277 char *s, *t;
278 int indent, retval;
279 struct file_name names[MAX_FILE];
280
281 memset(names, 0, sizeof(names));
282 ok_to_create_file = false;
283 fseek(pfp, p_base, SEEK_SET);
284 p_input_line = p_bline - 1;
285 for (;;) {
286 previous_line = this_line;
287 last_line_was_command = this_is_a_command;
288 stars_last_line = stars_this_line;
289 this_line = ftell(pfp);
290 indent = 0;
291 p_input_line++;
292 if (pgets(false) == 0) {
293 if (first_command_line >= 0L) {
294 /* nothing but deletes!? */
295 p_start = first_command_line;
296 p_sline = fcl_line;
297 retval = ED_DIFF;
298 goto scan_exit;
299 } else {
300 p_start = this_line;
301 p_sline = p_input_line;
302 retval = 0;
303 goto scan_exit;
304 }
305 }
306 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) {
307 if (*s == '\t')
308 indent += 8 - (indent % 8);
309 else
310 indent++;
311 }
312 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++)
313 ;
314 this_is_a_command = (isdigit((unsigned char)*s) &&
315 (*t == 'd' || *t == 'c' || *t == 'a'));
316 if (first_command_line < 0L && this_is_a_command) {
317 first_command_line = this_line;
318 fcl_line = p_input_line;
319 p_indent = indent; /* assume this for now */
320 }
321 if (!stars_last_line && strnEQ(s, "*** ", 4))
322 names[OLD_FILE].path = fetchname(s + 4,
323 &names[OLD_FILE].exists, strippath);
324 else if (strnEQ(s, "--- ", 4))
325 names[NEW_FILE].path = fetchname(s + 4,
326 &names[NEW_FILE].exists, strippath);
327 else if (strnEQ(s, "+++ ", 4))
328 /* pretend it is the old name */
329 names[OLD_FILE].path = fetchname(s + 4,
330 &names[OLD_FILE].exists, strippath);
331 else if (strnEQ(s, "Index:", 6))
332 names[INDEX_FILE].path = fetchname(s + 6,
333 &names[INDEX_FILE].exists, strippath);
334 else if (strnEQ(s, "Prereq:", 7)) {
335 for (t = s + 7; isspace((unsigned char)*t); t++)
336 ;
337 revision = savestr(t);
338 for (t = revision; *t && !isspace((unsigned char)*t); t++)
339 ;
340 *t = '\0';
341 if (*revision == '\0') {
342 free(revision);
343 revision = NULL;
344 }
345 } else if (strnEQ(s, "==== ", 5)) {
346 /* Perforce-style diffs. */
347 if ((t = strstr(s + 5, " - ")) != NULL)
348 p4_fetchname(&names[NEW_FILE], t + 3);
349 p4_fetchname(&names[OLD_FILE], s + 5);
350 }
351 if ((!diff_type || diff_type == ED_DIFF) &&
352 first_command_line >= 0L &&
353 strEQ(s, ".\n")) {
354 p_indent = indent;
355 p_start = first_command_line;
356 p_sline = fcl_line;
357 retval = ED_DIFF;
358 goto scan_exit;
359 }
360 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) {
361 if (strnEQ(s + 4, "0,0", 3))
362 ok_to_create_file = true;
363 p_indent = indent;
364 p_start = this_line;
365 p_sline = p_input_line;
366 retval = UNI_DIFF;
367 goto scan_exit;
368 }
369 stars_this_line = strnEQ(s, "********", 8);
370 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line &&
371 strnEQ(s, "*** ", 4)) {
372 if (atol(s + 4) == 0)
373 ok_to_create_file = true;
374 /*
375 * If this is a new context diff the character just
376 * before the newline is a '*'.
377 */
378 while (*s != '\n')
379 s++;
380 p_indent = indent;
381 p_start = previous_line;
382 p_sline = p_input_line - 1;
383 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF);
384 goto scan_exit;
385 }
386 if ((!diff_type || diff_type == NORMAL_DIFF) &&
387 last_line_was_command &&
388 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) {
389 p_start = previous_line;
390 p_sline = p_input_line - 1;
391 p_indent = indent;
392 retval = NORMAL_DIFF;
393 goto scan_exit;
394 }
395 }
396 scan_exit:
397 if (retval == UNI_DIFF) {
398 /* unswap old and new */
399 struct file_name tmp = names[OLD_FILE];
400 names[OLD_FILE] = names[NEW_FILE];
401 names[NEW_FILE] = tmp;
402 }
403 if (filearg[0] == NULL) {
404 if (posix)
405 filearg[0] = posix_name(names, ok_to_create_file);
406 else {
407 /* Ignore the Index: name for context diffs, like GNU */
408 if (names[OLD_FILE].path != NULL ||
409 names[NEW_FILE].path != NULL) {
410 free(names[INDEX_FILE].path);
411 names[INDEX_FILE].path = NULL;
412 }
413 filearg[0] = best_name(names, ok_to_create_file);
414 }
415 }
416
417 free(bestguess);
418 bestguess = NULL;
419 if (filearg[0] != NULL)
420 bestguess = savestr(filearg[0]);
421 else if (!ok_to_create_file) {
422 /*
423 * We don't want to create a new file but we need a
424 * filename to set bestguess. Avoid setting filearg[0]
425 * so the file is not created automatically.
426 */
427 if (posix)
428 bestguess = posix_name(names, true);
429 else
430 bestguess = best_name(names, true);
431 }
432 free(names[OLD_FILE].path);
433 free(names[NEW_FILE].path);
434 free(names[INDEX_FILE].path);
435 return retval;
436 }
437
438 /*
439 * Remember where this patch ends so we know where to start up again.
440 */
441 static void
442 next_intuit_at(LINENUM file_pos, LINENUM file_line)
443 {
444 p_base = file_pos;
445 p_bline = file_line;
446 }
447
448 /*
449 * Basically a verbose fseek() to the actual diff listing.
450 */
451 static void
452 skip_to(LINENUM file_pos, LINENUM file_line)
453 {
454 size_t len;
455
456 if (p_base > file_pos)
457 fatal("Internal error: seek %ld>%ld\n", p_base, file_pos);
458 if (verbose && p_base < file_pos) {
459 fseek(pfp, p_base, SEEK_SET);
460 say("The text leading up to this was:\n--------------------------\n");
461 while (ftell(pfp) < file_pos) {
462 len = pgets(false);
463 if (len == 0)
464 fatal("Unexpected end of file\n");
465 say("|%s", buf);
466 }
467 say("--------------------------\n");
468 } else
469 fseek(pfp, file_pos, SEEK_SET);
470 p_input_line = file_line - 1;
471 }
472
473 /* Make this a function for better debugging. */
474 static void
475 malformed(void)
476 {
477 fatal("malformed patch at line %ld: %s", p_input_line, buf);
478 /* about as informative as "Syntax error" in C */
479 }
480
481 /*
482 * True if the line has been discarded (i.e. it is a line saying
483 * "\ No newline at end of file".)
484 */
485 static bool
486 remove_special_line(void)
487 {
488 int c;
489
490 c = fgetc(pfp);
491 if (c == '\\') {
492 do {
493 c = fgetc(pfp);
494 } while (c != EOF && c != '\n');
495
496 return true;
497 }
498 if (c != EOF)
499 fseek(pfp, -1L, SEEK_CUR);
500
501 return false;
502 }
503
504 /*
505 * True if there is more of the current diff listing to process.
506 */
507 bool
508 another_hunk(void)
509 {
510 long line_beginning; /* file pos of the current line */
511 LINENUM repl_beginning; /* index of --- line */
512 LINENUM fillcnt; /* #lines of missing ptrn or repl */
513 LINENUM fillsrc; /* index of first line to copy */
514 LINENUM filldst; /* index of first missing line */
515 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */
516 bool repl_could_be_missing; /* no + or ! lines in this hunk */
517 bool repl_missing; /* we are now backtracking */
518 long repl_backtrack_position; /* file pos of first repl line */
519 LINENUM repl_patch_line; /* input line number for same */
520 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */
521 char *s;
522 size_t len;
523 int context = 0;
524
525 while (p_end >= 0) {
526 if (p_end == p_efake)
527 p_end = p_bfake; /* don't free twice */
528 else
529 free(p_line[p_end]);
530 p_end--;
531 }
532 p_efake = -1;
533
534 p_max = hunkmax; /* gets reduced when --- found */
535 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) {
536 line_beginning = ftell(pfp);
537 repl_beginning = 0;
538 fillcnt = 0;
539 fillsrc = 0;
540 filldst = 0;
541 ptrn_spaces_eaten = false;
542 repl_could_be_missing = true;
543 repl_missing = false;
544 repl_backtrack_position = 0;
545 repl_patch_line = 0;
546 ptrn_copiable = 0;
547
548 len = pgets(true);
549 p_input_line++;
550 if (len == 0 || strnNE(buf, "********", 8)) {
551 next_intuit_at(line_beginning, p_input_line);
552 return false;
553 }
554 p_context = 100;
555 p_hunk_beg = p_input_line + 1;
556 while (p_end < p_max) {
557 line_beginning = ftell(pfp);
558 len = pgets(true);
559 p_input_line++;
560 if (len == 0) {
561 if (p_max - p_end < 4) {
562 /* assume blank lines got chopped */
563 strlcpy(buf, " \n", buf_size);
564 } else {
565 if (repl_beginning && repl_could_be_missing) {
566 repl_missing = true;
567 goto hunk_done;
568 }
569 fatal("unexpected end of file in patch\n");
570 }
571 }
572 p_end++;
573 if (p_end >= hunkmax)
574 fatal("Internal error: hunk larger than hunk "
575 "buffer size");
576 p_char[p_end] = *buf;
577 p_line[p_end] = NULL;
578 switch (*buf) {
579 case '*':
580 if (strnEQ(buf, "********", 8)) {
581 if (repl_beginning && repl_could_be_missing) {
582 repl_missing = true;
583 goto hunk_done;
584 } else
585 fatal("unexpected end of hunk "
586 "at line %ld\n",
587 p_input_line);
588 }
589 if (p_end != 0) {
590 if (repl_beginning && repl_could_be_missing) {
591 repl_missing = true;
592 goto hunk_done;
593 }
594 fatal("unexpected *** at line %ld: %s",
595 p_input_line, buf);
596 }
597 context = 0;
598 p_line[p_end] = savestr(buf);
599 if (out_of_mem) {
600 p_end--;
601 return false;
602 }
603 for (s = buf; *s && !isdigit((unsigned char)*s); s++)
604 ;
605 if (!*s)
606 malformed();
607 if (strnEQ(s, "0,0", 3))
608 memmove(s, s + 2, strlen(s + 2) + 1);
609 p_first = (LINENUM) atol(s);
610 while (isdigit((unsigned char)*s))
611 s++;
612 if (*s == ',') {
613 for (; *s && !isdigit((unsigned char)*s); s++)
614 ;
615 if (!*s)
616 malformed();
617 p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1;
618 } else if (p_first)
619 p_ptrn_lines = 1;
620 else {
621 p_ptrn_lines = 0;
622 p_first = 1;
623 }
624
625 /* we need this much at least */
626 p_max = p_ptrn_lines + 6;
627 while (p_max >= hunkmax)
628 grow_hunkmax();
629 p_max = hunkmax;
630 break;
631 case '-':
632 if (buf[1] == '-') {
633 if (repl_beginning ||
634 (p_end != p_ptrn_lines + 1 +
635 (p_char[p_end - 1] == '\n'))) {
636 if (p_end == 1) {
637 /*
638 * `old' lines were omitted;
639 * set up to fill them in
640 * from 'new' context lines.
641 */
642 p_end = p_ptrn_lines + 1;
643 fillsrc = p_end + 1;
644 filldst = 1;
645 fillcnt = p_ptrn_lines;
646 } else {
647 if (repl_beginning) {
648 if (repl_could_be_missing) {
649 repl_missing = true;
650 goto hunk_done;
651 }
652 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n",
653 p_input_line, p_hunk_beg + repl_beginning);
654 } else {
655 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n",
656 (p_end <= p_ptrn_lines
657 ? "Premature"
658 : "Overdue"),
659 p_input_line, p_hunk_beg);
660 }
661 }
662 }
663 repl_beginning = p_end;
664 repl_backtrack_position = ftell(pfp);
665 repl_patch_line = p_input_line;
666 p_line[p_end] = savestr(buf);
667 if (out_of_mem) {
668 p_end--;
669 return false;
670 }
671 p_char[p_end] = '=';
672 for (s = buf; *s && !isdigit((unsigned char)*s); s++)
673 ;
674 if (!*s)
675 malformed();
676 p_newfirst = (LINENUM) atol(s);
677 while (isdigit((unsigned char)*s))
678 s++;
679 if (*s == ',') {
680 for (; *s && !isdigit((unsigned char)*s); s++)
681 ;
682 if (!*s)
683 malformed();
684 p_repl_lines = ((LINENUM) atol(s)) -
685 p_newfirst + 1;
686 } else if (p_newfirst)
687 p_repl_lines = 1;
688 else {
689 p_repl_lines = 0;
690 p_newfirst = 1;
691 }
692 p_max = p_repl_lines + p_end;
693 if (p_max > MAXHUNKSIZE)
694 fatal("hunk too large (%ld lines) at line %ld: %s",
695 p_max, p_input_line, buf);
696 while (p_max >= hunkmax)
697 grow_hunkmax();
698 if (p_repl_lines != ptrn_copiable &&
699 (p_context != 0 || p_repl_lines != 1))
700 repl_could_be_missing = false;
701 break;
702 }
703 goto change_line;
704 case '+':
705 case '!':
706 repl_could_be_missing = false;
707 change_line:
708 if (buf[1] == '\n' && canonicalize)
709 strlcpy(buf + 1, " \n", buf_size - 1);
710 if (!isspace((unsigned char)buf[1]) && buf[1] != '>' &&
711 buf[1] != '<' &&
712 repl_beginning && repl_could_be_missing) {
713 repl_missing = true;
714 goto hunk_done;
715 }
716 if (context >= 0) {
717 if (context < p_context)
718 p_context = context;
719 context = -1000;
720 }
721 p_line[p_end] = savestr(buf + 2);
722 if (out_of_mem) {
723 p_end--;
724 return false;
725 }
726 if (p_end == p_ptrn_lines) {
727 if (remove_special_line()) {
728 int l;
729
730 l = strlen(p_line[p_end]) - 1;
731 (p_line[p_end])[l] = 0;
732 }
733 }
734 break;
735 case '\t':
736 case '\n': /* assume the 2 spaces got eaten */
737 if (repl_beginning && repl_could_be_missing &&
738 (!ptrn_spaces_eaten ||
739 diff_type == NEW_CONTEXT_DIFF)) {
740 repl_missing = true;
741 goto hunk_done;
742 }
743 p_line[p_end] = savestr(buf);
744 if (out_of_mem) {
745 p_end--;
746 return false;
747 }
748 if (p_end != p_ptrn_lines + 1) {
749 ptrn_spaces_eaten |= (repl_beginning != 0);
750 context++;
751 if (!repl_beginning)
752 ptrn_copiable++;
753 p_char[p_end] = ' ';
754 }
755 break;
756 case ' ':
757 if (!isspace((unsigned char)buf[1]) &&
758 repl_beginning && repl_could_be_missing) {
759 repl_missing = true;
760 goto hunk_done;
761 }
762 context++;
763 if (!repl_beginning)
764 ptrn_copiable++;
765 p_line[p_end] = savestr(buf + 2);
766 if (out_of_mem) {
767 p_end--;
768 return false;
769 }
770 break;
771 default:
772 if (repl_beginning && repl_could_be_missing) {
773 repl_missing = true;
774 goto hunk_done;
775 }
776 malformed();
777 }
778 /* set up p_len for strncmp() so we don't have to */
779 /* assume null termination */
780 if (p_line[p_end])
781 p_len[p_end] = strlen(p_line[p_end]);
782 else
783 p_len[p_end] = 0;
784 }
785
786 hunk_done:
787 if (p_end >= 0 && !repl_beginning)
788 fatal("no --- found in patch at line %ld\n", pch_hunk_beg());
789
790 if (repl_missing) {
791
792 /* reset state back to just after --- */
793 p_input_line = repl_patch_line;
794 for (p_end--; p_end > repl_beginning; p_end--)
795 free(p_line[p_end]);
796 fseek(pfp, repl_backtrack_position, SEEK_SET);
797
798 /* redundant 'new' context lines were omitted - set */
799 /* up to fill them in from the old file context */
800 if (!p_context && p_repl_lines == 1) {
801 p_repl_lines = 0;
802 p_max--;
803 }
804 fillsrc = 1;
805 filldst = repl_beginning + 1;
806 fillcnt = p_repl_lines;
807 p_end = p_max;
808 } else if (!p_context && fillcnt == 1) {
809 /* the first hunk was a null hunk with no context */
810 /* and we were expecting one line -- fix it up. */
811 while (filldst < p_end) {
812 p_line[filldst] = p_line[filldst + 1];
813 p_char[filldst] = p_char[filldst + 1];
814 p_len[filldst] = p_len[filldst + 1];
815 filldst++;
816 }
817 #if 0
818 repl_beginning--; /* this doesn't need to be fixed */
819 #endif
820 p_end--;
821 p_first++; /* do append rather than insert */
822 fillcnt = 0;
823 p_ptrn_lines = 0;
824 }
825 if (diff_type == CONTEXT_DIFF &&
826 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) {
827 if (verbose)
828 say("%s\n%s\n%s\n",
829 "(Fascinating--this is really a new-style context diff but without",
830 "the telltale extra asterisks on the *** line that usually indicate",
831 "the new style...)");
832 diff_type = NEW_CONTEXT_DIFF;
833 }
834 /* if there were omitted context lines, fill them in now */
835 if (fillcnt) {
836 p_bfake = filldst; /* remember where not to free() */
837 p_efake = filldst + fillcnt - 1;
838 while (fillcnt-- > 0) {
839 while (fillsrc <= p_end && p_char[fillsrc] != ' ')
840 fillsrc++;
841 if (fillsrc > p_end)
842 fatal("replacement text or line numbers mangled in hunk at line %ld\n",
843 p_hunk_beg);
844 p_line[filldst] = p_line[fillsrc];
845 p_char[filldst] = p_char[fillsrc];
846 p_len[filldst] = p_len[fillsrc];
847 fillsrc++;
848 filldst++;
849 }
850 while (fillsrc <= p_end && fillsrc != repl_beginning &&
851 p_char[fillsrc] != ' ')
852 fillsrc++;
853 #ifdef DEBUGGING
854 if (debug & 64)
855 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n",
856 fillsrc, filldst, repl_beginning, p_end + 1);
857 #endif
858 if (fillsrc != p_end + 1 && fillsrc != repl_beginning)
859 malformed();
860 if (filldst != p_end + 1 && filldst != repl_beginning)
861 malformed();
862 }
863 if (p_line[p_end] != NULL) {
864 if (remove_special_line()) {
865 p_len[p_end] -= 1;
866 (p_line[p_end])[p_len[p_end]] = 0;
867 }
868 }
869 } else if (diff_type == UNI_DIFF) {
870 LINENUM fillold; /* index of old lines */
871 LINENUM fillnew; /* index of new lines */
872 char ch;
873
874 line_beginning = ftell(pfp); /* file pos of the current line */
875 len = pgets(true);
876 p_input_line++;
877 if (len == 0 || strnNE(buf, "@@ -", 4)) {
878 next_intuit_at(line_beginning, p_input_line);
879 return false;
880 }
881 s = buf + 4;
882 if (!*s)
883 malformed();
884 p_first = (LINENUM) atol(s);
885 while (isdigit((unsigned char)*s))
886 s++;
887 if (*s == ',') {
888 p_ptrn_lines = (LINENUM) atol(++s);
889 while (isdigit((unsigned char)*s))
890 s++;
891 } else
892 p_ptrn_lines = 1;
893 if (*s == ' ')
894 s++;
895 if (*s != '+' || !*++s)
896 malformed();
897 p_newfirst = (LINENUM) atol(s);
898 while (isdigit((unsigned char)*s))
899 s++;
900 if (*s == ',') {
901 p_repl_lines = (LINENUM) atol(++s);
902 while (isdigit((unsigned char)*s))
903 s++;
904 } else
905 p_repl_lines = 1;
906 if (*s == ' ')
907 s++;
908 if (*s != '@')
909 malformed();
910 if (!p_ptrn_lines)
911 p_first++; /* do append rather than insert */
912 p_max = p_ptrn_lines + p_repl_lines + 1;
913 while (p_max >= hunkmax)
914 grow_hunkmax();
915 fillold = 1;
916 fillnew = fillold + p_ptrn_lines;
917 p_end = fillnew + p_repl_lines;
918 snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first,
919 p_first + p_ptrn_lines - 1);
920 p_line[0] = savestr(buf);
921 if (out_of_mem) {
922 p_end = -1;
923 return false;
924 }
925 p_char[0] = '*';
926 snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst,
927 p_newfirst + p_repl_lines - 1);
928 p_line[fillnew] = savestr(buf);
929 if (out_of_mem) {
930 p_end = 0;
931 return false;
932 }
933 p_char[fillnew++] = '=';
934 p_context = 100;
935 context = 0;
936 p_hunk_beg = p_input_line + 1;
937 while (fillold <= p_ptrn_lines || fillnew <= p_end) {
938 line_beginning = ftell(pfp);
939 len = pgets(true);
940 p_input_line++;
941 if (len == 0) {
942 if (p_max - fillnew < 3) {
943 /* assume blank lines got chopped */
944 strlcpy(buf, " \n", buf_size);
945 } else {
946 fatal("unexpected end of file in patch\n");
947 }
948 }
949 if (*buf == '\t' || *buf == '\n') {
950 ch = ' '; /* assume the space got eaten */
951 s = savestr(buf);
952 } else {
953 ch = *buf;
954 s = savestr(buf + 1);
955 }
956 if (out_of_mem) {
957 while (--fillnew > p_ptrn_lines)
958 free(p_line[fillnew]);
959 p_end = fillold - 1;
960 return false;
961 }
962 switch (ch) {
963 case '-':
964 if (fillold > p_ptrn_lines) {
965 free(s);
966 p_end = fillnew - 1;
967 malformed();
968 }
969 p_char[fillold] = ch;
970 p_line[fillold] = s;
971 p_len[fillold++] = strlen(s);
972 if (fillold > p_ptrn_lines) {
973 if (remove_special_line()) {
974 p_len[fillold - 1] -= 1;
975 s[p_len[fillold - 1]] = 0;
976 }
977 }
978 break;
979 case '=':
980 ch = ' ';
981 /* FALL THROUGH */
982 case ' ':
983 if (fillold > p_ptrn_lines) {
984 free(s);
985 while (--fillnew > p_ptrn_lines)
986 free(p_line[fillnew]);
987 p_end = fillold - 1;
988 malformed();
989 }
990 context++;
991 p_char[fillold] = ch;
992 p_line[fillold] = s;
993 p_len[fillold++] = strlen(s);
994 s = savestr(s);
995 if (out_of_mem) {
996 while (--fillnew > p_ptrn_lines)
997 free(p_line[fillnew]);
998 p_end = fillold - 1;
999 return false;
1000 }
1001 if (fillold > p_ptrn_lines) {
1002 if (remove_special_line()) {
1003 p_len[fillold - 1] -= 1;
1004 s[p_len[fillold - 1]] = 0;
1005 }
1006 }
1007 /* FALL THROUGH */
1008 case '+':
1009 if (fillnew > p_end) {
1010 free(s);
1011 while (--fillnew > p_ptrn_lines)
1012 free(p_line[fillnew]);
1013 p_end = fillold - 1;
1014 malformed();
1015 }
1016 p_char[fillnew] = ch;
1017 p_line[fillnew] = s;
1018 p_len[fillnew++] = strlen(s);
1019 if (fillold > p_ptrn_lines) {
1020 if (remove_special_line()) {
1021 p_len[fillnew - 1] -= 1;
1022 s[p_len[fillnew - 1]] = 0;
1023 }
1024 }
1025 break;
1026 default:
1027 p_end = fillnew;
1028 malformed();
1029 }
1030 if (ch != ' ' && context > 0) {
1031 if (context < p_context)
1032 p_context = context;
1033 context = -1000;
1034 }
1035 } /* while */
1036 } else { /* normal diff--fake it up */
1037 char hunk_type;
1038 int i;
1039 LINENUM min, max;
1040
1041 line_beginning = ftell(pfp);
1042 p_context = 0;
1043 len = pgets(true);
1044 p_input_line++;
1045 if (len == 0 || !isdigit((unsigned char)*buf)) {
1046 next_intuit_at(line_beginning, p_input_line);
1047 return false;
1048 }
1049 p_first = (LINENUM) atol(buf);
1050 for (s = buf; isdigit((unsigned char)*s); s++)
1051 ;
1052 if (*s == ',') {
1053 p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1;
1054 while (isdigit((unsigned char)*s))
1055 s++;
1056 } else
1057 p_ptrn_lines = (*s != 'a');
1058 hunk_type = *s;
1059 if (hunk_type == 'a')
1060 p_first++; /* do append rather than insert */
1061 min = (LINENUM) atol(++s);
1062 for (; isdigit((unsigned char)*s); s++)
1063 ;
1064 if (*s == ',')
1065 max = (LINENUM) atol(++s);
1066 else
1067 max = min;
1068 if (hunk_type == 'd')
1069 min++;
1070 p_end = p_ptrn_lines + 1 + max - min + 1;
1071 if (p_end > MAXHUNKSIZE)
1072 fatal("hunk too large (%ld lines) at line %ld: %s",
1073 p_end, p_input_line, buf);
1074 while (p_end >= hunkmax)
1075 grow_hunkmax();
1076 p_newfirst = min;
1077 p_repl_lines = max - min + 1;
1078 snprintf(buf, buf_size, "*** %ld,%ld\n", p_first,
1079 p_first + p_ptrn_lines - 1);
1080 p_line[0] = savestr(buf);
1081 if (out_of_mem) {
1082 p_end = -1;
1083 return false;
1084 }
1085 p_char[0] = '*';
1086 for (i = 1; i <= p_ptrn_lines; i++) {
1087 len = pgets(true);
1088 p_input_line++;
1089 if (len == 0)
1090 fatal("unexpected end of file in patch at line %ld\n",
1091 p_input_line);
1092 if (*buf != '<')
1093 fatal("< expected at line %ld of patch\n",
1094 p_input_line);
1095 p_line[i] = savestr(buf + 2);
1096 if (out_of_mem) {
1097 p_end = i - 1;
1098 return false;
1099 }
1100 p_len[i] = strlen(p_line[i]);
1101 p_char[i] = '-';
1102 }
1103
1104 if (remove_special_line()) {
1105 p_len[i - 1] -= 1;
1106 (p_line[i - 1])[p_len[i - 1]] = 0;
1107 }
1108 if (hunk_type == 'c') {
1109 len = pgets(true);
1110 p_input_line++;
1111 if (len == 0)
1112 fatal("unexpected end of file in patch at line %ld\n",
1113 p_input_line);
1114 if (*buf != '-')
1115 fatal("--- expected at line %ld of patch\n",
1116 p_input_line);
1117 }
1118 snprintf(buf, buf_size, "--- %ld,%ld\n", min, max);
1119 p_line[i] = savestr(buf);
1120 if (out_of_mem) {
1121 p_end = i - 1;
1122 return false;
1123 }
1124 p_char[i] = '=';
1125 for (i++; i <= p_end; i++) {
1126 len = pgets(true);
1127 p_input_line++;
1128 if (len == 0)
1129 fatal("unexpected end of file in patch at line %ld\n",
1130 p_input_line);
1131 if (*buf != '>')
1132 fatal("> expected at line %ld of patch\n",
1133 p_input_line);
1134 p_line[i] = savestr(buf + 2);
1135 if (out_of_mem) {
1136 p_end = i - 1;
1137 return false;
1138 }
1139 p_len[i] = strlen(p_line[i]);
1140 p_char[i] = '+';
1141 }
1142
1143 if (remove_special_line()) {
1144 p_len[i - 1] -= 1;
1145 (p_line[i - 1])[p_len[i - 1]] = 0;
1146 }
1147 }
1148 if (reverse) /* backwards patch? */
1149 if (!pch_swap())
1150 say("Not enough memory to swap next hunk!\n");
1151 #ifdef DEBUGGING
1152 if (debug & 2) {
1153 int i;
1154 char special;
1155
1156 for (i = 0; i <= p_end; i++) {
1157 if (i == p_ptrn_lines)
1158 special = '^';
1159 else
1160 special = ' ';
1161 fprintf(stderr, "%3d %c %c %s", i, p_char[i],
1162 special, p_line[i]);
1163 fflush(stderr);
1164 }
1165 }
1166 #endif
1167 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */
1168 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */
1169 return true;
1170 }
1171
1172 /*
1173 * Input a line from the patch file.
1174 * Worry about indentation if do_indent is true.
1175 * The line is read directly into the buf global variable which
1176 * is resized if necessary in order to hold the complete line.
1177 * Returns the number of characters read including the terminating
1178 * '\n', if any.
1179 */
1180 size_t
1181 pgets(bool do_indent)
1182 {
1183 char *line;
1184 size_t len;
1185 int indent = 0, skipped = 0;
1186
1187 line = fgetln(pfp, &len);
1188 if (line != NULL) {
1189 if (len + 1 > buf_size) {
1190 while (len + 1 > buf_size)
1191 buf_size *= 2;
1192 free(buf);
1193 buf = malloc(buf_size);
1194 if (buf == NULL)
1195 fatal("out of memory\n");
1196 }
1197 if (do_indent == 1 && p_indent) {
1198 for (;
1199 indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X');
1200 line++, skipped++) {
1201 if (*line == '\t')
1202 indent += 8 - (indent %7);
1203 else
1204 indent++;
1205 }
1206 }
1207 memcpy(buf, line, len - skipped);
1208 buf[len - skipped] = '\0';
1209 }
1210 return len;
1211 }
1212
1213
1214 /*
1215 * Reverse the old and new portions of the current hunk.
1216 */
1217 bool
1218 pch_swap(void)
1219 {
1220 char **tp_line; /* the text of the hunk */
1221 size_t *tp_len; /* length of each line */
1222 char *tp_char; /* +, -, and ! */
1223 LINENUM i;
1224 LINENUM n;
1225 bool blankline = false;
1226 char *s;
1227
1228 i = p_first;
1229 p_first = p_newfirst;
1230 p_newfirst = i;
1231
1232 /* make a scratch copy */
1233
1234 tp_line = p_line;
1235 tp_len = p_len;
1236 tp_char = p_char;
1237 p_line = NULL; /* force set_hunkmax to allocate again */
1238 p_len = NULL;
1239 p_char = NULL;
1240 set_hunkmax();
1241 if (p_line == NULL || p_len == NULL || p_char == NULL) {
1242
1243 free(p_line);
1244 p_line = tp_line;
1245 free(p_len);
1246 p_len = tp_len;
1247 free(p_char);
1248 p_char = tp_char;
1249 return false; /* not enough memory to swap hunk! */
1250 }
1251 /* now turn the new into the old */
1252
1253 i = p_ptrn_lines + 1;
1254 if (tp_char[i] == '\n') { /* account for possible blank line */
1255 blankline = true;
1256 i++;
1257 }
1258 if (p_efake >= 0) { /* fix non-freeable ptr range */
1259 if (p_efake <= i)
1260 n = p_end - i + 1;
1261 else
1262 n = -i;
1263 p_efake += n;
1264 p_bfake += n;
1265 }
1266 for (n = 0; i <= p_end; i++, n++) {
1267 p_line[n] = tp_line[i];
1268 p_char[n] = tp_char[i];
1269 if (p_char[n] == '+')
1270 p_char[n] = '-';
1271 p_len[n] = tp_len[i];
1272 }
1273 if (blankline) {
1274 i = p_ptrn_lines + 1;
1275 p_line[n] = tp_line[i];
1276 p_char[n] = tp_char[i];
1277 p_len[n] = tp_len[i];
1278 n++;
1279 }
1280 if (p_char[0] != '=')
1281 fatal("Malformed patch at line %ld: expected '=' found '%c'\n",
1282 p_input_line, p_char[0]);
1283 p_char[0] = '*';
1284 for (s = p_line[0]; *s; s++)
1285 if (*s == '-')
1286 *s = '*';
1287
1288 /* now turn the old into the new */
1289
1290 if (p_char[0] != '*')
1291 fatal("Malformed patch at line %ld: expected '*' found '%c'\n",
1292 p_input_line, p_char[0]);
1293 tp_char[0] = '=';
1294 for (s = tp_line[0]; *s; s++)
1295 if (*s == '*')
1296 *s = '-';
1297 for (i = 0; n <= p_end; i++, n++) {
1298 p_line[n] = tp_line[i];
1299 p_char[n] = tp_char[i];
1300 if (p_char[n] == '-')
1301 p_char[n] = '+';
1302 p_len[n] = tp_len[i];
1303 }
1304
1305 if (i != p_ptrn_lines + 1)
1306 fatal("Malformed patch at line %ld: expected %ld lines, "
1307 "got %ld\n",
1308 p_input_line, p_ptrn_lines + 1, i);
1309
1310 i = p_ptrn_lines;
1311 p_ptrn_lines = p_repl_lines;
1312 p_repl_lines = i;
1313
1314 free(tp_line);
1315 free(tp_len);
1316 free(tp_char);
1317
1318 return true;
1319 }
1320
1321 /*
1322 * Return the specified line position in the old file of the old context.
1323 */
1324 LINENUM
1325 pch_first(void)
1326 {
1327 return p_first;
1328 }
1329
1330 /*
1331 * Return the number of lines of old context.
1332 */
1333 LINENUM
1334 pch_ptrn_lines(void)
1335 {
1336 return p_ptrn_lines;
1337 }
1338
1339 /*
1340 * Return the probable line position in the new file of the first line.
1341 */
1342 LINENUM
1343 pch_newfirst(void)
1344 {
1345 return p_newfirst;
1346 }
1347
1348 /*
1349 * Return the number of lines in the replacement text including context.
1350 */
1351 LINENUM
1352 pch_repl_lines(void)
1353 {
1354 return p_repl_lines;
1355 }
1356
1357 /*
1358 * Return the number of lines in the whole hunk.
1359 */
1360 LINENUM
1361 pch_end(void)
1362 {
1363 return p_end;
1364 }
1365
1366 /*
1367 * Return the number of context lines before the first changed line.
1368 */
1369 LINENUM
1370 pch_context(void)
1371 {
1372 return p_context;
1373 }
1374
1375 /*
1376 * Return the length of a particular patch line.
1377 */
1378 size_t
1379 pch_line_len(LINENUM line)
1380 {
1381 return p_len[line];
1382 }
1383
1384 /*
1385 * Return the control character (+, -, *, !, etc) for a patch line.
1386 */
1387 char
1388 pch_char(LINENUM line)
1389 {
1390 return p_char[line];
1391 }
1392
1393 /*
1394 * Return a pointer to a particular patch line.
1395 */
1396 char *
1397 pfetch(LINENUM line)
1398 {
1399 return p_line[line];
1400 }
1401
1402 /*
1403 * Return where in the patch file this hunk began, for error messages.
1404 */
1405 LINENUM
1406 pch_hunk_beg(void)
1407 {
1408 return p_hunk_beg;
1409 }
1410
1411 /*
1412 * Apply an ed script by feeding ed itself.
1413 */
1414 void
1415 do_ed_script(void)
1416 {
1417 char *t;
1418 long beginning_of_this_line;
1419 FILE *pipefp = NULL;
1420 int continuation;
1421
1422 if (!skip_rest_of_patch) {
1423 if (copy_file(filearg[0], TMPOUTNAME) < 0) {
1424 unlink(TMPOUTNAME);
1425 fatal("can't create temp file %s", TMPOUTNAME);
1426 }
1427 snprintf(buf, buf_size, "%s%s%s", _PATH_RED,
1428 verbose ? " " : " -s ", TMPOUTNAME);
1429 pipefp = popen(buf, "w");
1430 }
1431 for (;;) {
1432 beginning_of_this_line = ftell(pfp);
1433 if (pgets(true) == 0) {
1434 next_intuit_at(beginning_of_this_line, p_input_line);
1435 break;
1436 }
1437 p_input_line++;
1438 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++)
1439 ;
1440 /* POSIX defines allowed commands as {a,c,d,i,s} */
1441 if (isdigit((unsigned char)*buf) && (*t == 'a' || *t == 'c' ||
1442 *t == 'd' || *t == 'i' || *t == 's')) {
1443 if (pipefp != NULL)
1444 fputs(buf, pipefp);
1445 if (*t == 's') {
1446 for (;;) {
1447 continuation = 0;
1448 t = strchr(buf, '\0') - 1;
1449 while (--t >= buf && *t == '\\')
1450 continuation = !continuation;
1451 if (!continuation || !pgets(true))
1452 break;
1453 if (pipefp != NULL)
1454 fputs(buf, pipefp);
1455 }
1456 } else if (*t != 'd') {
1457 while (pgets(true)) {
1458 p_input_line++;
1459 if (pipefp != NULL)
1460 fputs(buf, pipefp);
1461 if (strEQ(buf, ".\n"))
1462 break;
1463 }
1464 }
1465 } else {
1466 next_intuit_at(beginning_of_this_line, p_input_line);
1467 break;
1468 }
1469 }
1470 if (pipefp == NULL)
1471 return;
1472 fprintf(pipefp, "w\n");
1473 fprintf(pipefp, "q\n");
1474 fflush(pipefp);
1475 pclose(pipefp);
1476 ignore_signals();
1477 if (!check_only) {
1478 if (move_file(TMPOUTNAME, outname) < 0) {
1479 toutkeep = true;
1480 chmod(TMPOUTNAME, filemode);
1481 } else
1482 chmod(outname, filemode);
1483 }
1484 set_signals(1);
1485 }
1486
1487 /*
1488 * Choose the name of the file to be patched based on POSIX rules.
1489 * NOTE: the POSIX rules are amazingly stupid and we only follow them
1490 * if the user specified --posix or set POSIXLY_CORRECT.
1491 */
1492 static char *
1493 posix_name(const struct file_name *names, bool assume_exists)
1494 {
1495 char *path = NULL;
1496 int i;
1497
1498 /*
1499 * POSIX states that the filename will be chosen from one
1500 * of the old, new and index names (in that order) if
1501 * the file exists relative to CWD after -p stripping.
1502 */
1503 for (i = 0; i < MAX_FILE; i++) {
1504 if (names[i].path != NULL && names[i].exists) {
1505 path = names[i].path;
1506 break;
1507 }
1508 }
1509 if (path == NULL && !assume_exists) {
1510 /*
1511 * No files found, look for something we can checkout from
1512 * RCS/SCCS dirs. Same order as above.
1513 */
1514 for (i = 0; i < MAX_FILE; i++) {
1515 if (names[i].path != NULL &&
1516 (path = checked_in(names[i].path)) != NULL)
1517 break;
1518 }
1519 /*
1520 * Still no match? Check to see if the diff could be creating
1521 * a new file.
1522 */
1523 if (path == NULL && ok_to_create_file &&
1524 names[NEW_FILE].path != NULL)
1525 path = names[NEW_FILE].path;
1526 }
1527
1528 return path ? savestr(path) : NULL;
1529 }
1530
1531 static char *
1532 compare_names(const struct file_name *names, bool assume_exists, int phase)
1533 {
1534 size_t min_components, min_baselen, min_len, tmp;
1535 char *best = NULL;
1536 char *path;
1537 int i;
1538
1539 /*
1540 * The "best" name is the one with the fewest number of path
1541 * components, the shortest basename length, and the shortest
1542 * overall length (in that order). We only use the Index: file
1543 * if neither of the old or new files could be intuited from
1544 * the diff header.
1545 */
1546 min_components = min_baselen = min_len = SIZE_MAX;
1547 for (i = INDEX_FILE; i >= OLD_FILE; i--) {
1548 path = names[i].path;
1549 if (path == NULL ||
1550 (phase == 1 && !names[i].exists && !assume_exists) ||
1551 (phase == 2 && checked_in(path) == NULL))
1552 continue;
1553 if ((tmp = num_components(path)) > min_components)
1554 continue;
1555 if (tmp < min_components) {
1556 min_components = tmp;
1557 best = path;
1558 }
1559 if ((tmp = strlen(basename(path))) > min_baselen)
1560 continue;
1561 if (tmp < min_baselen) {
1562 min_baselen = tmp;
1563 best = path;
1564 }
1565 if ((tmp = strlen(path)) > min_len)
1566 continue;
1567 min_len = tmp;
1568 best = path;
1569 }
1570 return best;
1571 }
1572
1573 /*
1574 * Choose the name of the file to be patched based the "best" one
1575 * available.
1576 */
1577 static char *
1578 best_name(const struct file_name *names, bool assume_exists)
1579 {
1580 char *best;
1581
1582 best = compare_names(names, assume_exists, 1);
1583 if (best == NULL) {
1584 best = compare_names(names, assume_exists, 2);
1585 /*
1586 * Still no match? Check to see if the diff could be creating
1587 * a new file.
1588 */
1589 if (best == NULL && ok_to_create_file &&
1590 names[NEW_FILE].path != NULL)
1591 best = names[NEW_FILE].path;
1592 }
1593
1594 return best ? savestr(best) : NULL;
1595 }
1596
1597 static size_t
1598 num_components(const char *path)
1599 {
1600 size_t n;
1601 const char *cp;
1602
1603 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) {
1604 while (*cp == '/')
1605 cp++; /* skip consecutive slashes */
1606 }
1607 return n;
1608 }
DragonFly BSD