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vknet.8: Fix typo.
[dragonfly.git] / usr.bin / patch / pch.c
blobd76b204486dafbedae18aadbf46dc07d90df9304
1 /*
2 * $OpenBSD: pch.c,v 1.37 2007/09/02 15:19:33 deraadt Exp $
3 * $DragonFly: src/usr.bin/patch/pch.c,v 1.6 2008/08/10 23:35:40 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 <libgen.h>
37 #include <limits.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42
43 #include "common.h"
44 #include "util.h"
45 #include "pch.h"
46 #include "pathnames.h"
47
48 /* Patch (diff listing) abstract type. */
49
50 static long p_filesize; /* size of the patch file */
51 static LINENUM p_first; /* 1st line number */
52 static LINENUM p_newfirst; /* 1st line number of replacement */
53 static LINENUM p_ptrn_lines; /* # lines in pattern */
54 static LINENUM p_repl_lines; /* # lines in replacement text */
55 static LINENUM p_end = -1; /* last line in hunk */
56 static LINENUM p_max; /* max allowed value of p_end */
57 static LINENUM p_context = 3; /* # of context lines */
58 static LINENUM p_input_line = 0; /* current line # from patch file */
59 static char **p_line = NULL;/* the text of the hunk */
60 static short *p_len = NULL; /* length of each line */
61 static char *p_char = NULL; /* +, -, and ! */
62 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */
63 static int p_indent; /* indent to patch */
64 static LINENUM p_base; /* where to intuit this time */
65 static LINENUM p_bline; /* line # of p_base */
66 static LINENUM p_start; /* where intuit found a patch */
67 static LINENUM p_sline; /* and the line number for it */
68 static LINENUM p_hunk_beg; /* line number of current hunk */
69 static LINENUM p_efake = -1; /* end of faked up lines--don't free */
70 static LINENUM p_bfake = -1; /* beg of faked up lines */
71 static FILE *pfp = NULL; /* patch file pointer */
72 static char *bestguess = NULL; /* guess at correct filename */
73
74 static void grow_hunkmax(void);
75 static int intuit_diff_type(void);
76 static void next_intuit_at(LINENUM, LINENUM);
77 static void skip_to(LINENUM, LINENUM);
78 static char *pgets(char *, int, FILE *);
79 static char *best_name(const struct file_name *, bool);
80 static char *posix_name(const struct file_name *, bool);
81 static size_t num_components(const char *);
82
83 /*
84 * Prepare to look for the next patch in the patch file.
85 */
86 void
87 re_patch(void)
88 {
89 p_first = 0;
90 p_newfirst = 0;
91 p_ptrn_lines = 0;
92 p_repl_lines = 0;
93 p_end = (LINENUM) - 1;
94 p_max = 0;
95 p_indent = 0;
96 }
97
98 /*
99 * Open the patch file at the beginning of time.
100 */
101 void
102 open_patch_file(const char *filename)
103 {
104 struct stat filestat;
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 (fgets(buf, buf_len, stdin) != NULL)
111 fputs(buf, pfp);
112 if (ferror(pfp) || fclose(pfp))
113 pfatal("can't write %s", TMPPATNAME);
114 filename = TMPPATNAME;
115 }
116 pfp = fopen(filename, "r");
117 if (pfp == NULL)
118 pfatal("patch file %s not found", filename);
119 fstat(fileno(pfp), &filestat);
120 p_filesize = filestat.st_size;
121 next_intuit_at(0L, 1L); /* start at the beginning */
122 set_hunkmax();
123 }
124
125 /*
126 * Make sure our dynamically realloced tables are malloced to begin with.
127 */
128 void
129 set_hunkmax(void)
130 {
131 if (p_line == NULL)
132 p_line = calloc((size_t) hunkmax, sizeof(char *));
133 if (p_len == NULL)
134 p_len = calloc((size_t) hunkmax, sizeof(short));
135 if (p_char == NULL)
136 p_char = calloc((size_t) hunkmax, sizeof(char));
137 }
138
139 /*
140 * Enlarge the arrays containing the current hunk of patch.
141 */
142 static void
143 grow_hunkmax(void)
144 {
145 int new_hunkmax;
146 char **new_p_line;
147 short *new_p_len;
148 char *new_p_char;
149
150 new_hunkmax = hunkmax * 2;
151
152 if (p_line == NULL || p_len == NULL || p_char == NULL)
153 fatal("Internal memory allocation error\n");
154
155 new_p_line = realloc(p_line, new_hunkmax * sizeof(char *));
156 if (new_p_line == NULL)
157 free(p_line);
158
159 new_p_len = realloc(p_len, new_hunkmax * sizeof(short));
160 if (new_p_len == NULL)
161 free(p_len);
162
163 new_p_char = realloc(p_char, new_hunkmax * sizeof(char));
164 if (new_p_char == NULL)
165 free(p_char);
166
167 p_char = new_p_char;
168 p_len = new_p_len;
169 p_line = new_p_line;
170
171 if (p_line != NULL && p_len != NULL && p_char != NULL) {
172 hunkmax = new_hunkmax;
173 return;
174 }
175
176 if (!using_plan_a)
177 fatal("out of memory\n");
178 out_of_mem = true; /* whatever is null will be allocated again */
179 /* from within plan_a(), of all places */
180 }
181
182 /* True if the remainder of the patch file contains a diff of some sort. */
183
184 bool
185 there_is_another_patch(void)
186 {
187 bool exists = false;
188
189 if (p_base != 0L && p_base >= p_filesize) {
190 if (verbose)
191 say("done\n");
192 return false;
193 }
194 if (verbose)
195 say("Hmm...");
196 diff_type = intuit_diff_type();
197 if (!diff_type) {
198 if (p_base != 0L) {
199 if (verbose)
200 say(" Ignoring the trailing garbage.\ndone\n");
201 } else
202 say(" I can't seem to find a patch in there anywhere.\n");
203 return false;
204 }
205 if (verbose)
206 say(" %sooks like %s to me...\n",
207 (p_base == 0L ? "L" : "The next patch l"),
208 diff_type == UNI_DIFF ? "a unified diff" :
209 diff_type == CONTEXT_DIFF ? "a context diff" :
210 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" :
211 diff_type == NORMAL_DIFF ? "a normal diff" :
212 "an ed script");
213 if (p_indent && verbose)
214 say("(Patch is indented %d space%s.)\n", p_indent,
215 p_indent == 1 ? "" : "s");
216 skip_to(p_start, p_sline);
217 while (filearg[0] == NULL) {
218 if (force || batch) {
219 say("No file to patch. Skipping...\n");
220 filearg[0] = savestr(bestguess);
221 skip_rest_of_patch = true;
222 return true;
223 }
224 ask("File to patch: ");
225 if (*buf != '\n') {
226 free(bestguess);
227 bestguess = savestr(buf);
228 filearg[0] = fetchname(buf, &exists, 0);
229 }
230 if (!exists) {
231 ask("No file found--skip this patch? [n] ");
232 if (*buf != 'y')
233 continue;
234 if (verbose)
235 say("Skipping patch...\n");
236 free(filearg[0]);
237 filearg[0] = fetchname(bestguess, &exists, 0);
238 skip_rest_of_patch = true;
239 return true;
240 }
241 }
242 return true;
243 }
244
245 /* Determine what kind of diff is in the remaining part of the patch file. */
246
247 static int
248 intuit_diff_type(void)
249 {
250 long this_line = 0, previous_line;
251 long first_command_line = -1;
252 LINENUM fcl_line = -1;
253 bool last_line_was_command = false, this_is_a_command = false;
254 bool stars_last_line = false, stars_this_line = false;
255 char *s, *t;
256 int indent, retval;
257 struct file_name names[MAX_FILE];
258
259 memset(names, 0, sizeof(names));
260 ok_to_create_file = false;
261 fseek(pfp, p_base, SEEK_SET);
262 p_input_line = p_bline - 1;
263 for (;;) {
264 previous_line = this_line;
265 last_line_was_command = this_is_a_command;
266 stars_last_line = stars_this_line;
267 this_line = ftell(pfp);
268 indent = 0;
269 p_input_line++;
270 if (fgets(buf, buf_len, pfp) == NULL) {
271 if (first_command_line >= 0L) {
272 /* nothing but deletes!? */
273 p_start = first_command_line;
274 p_sline = fcl_line;
275 retval = ED_DIFF;
276 goto scan_exit;
277 } else {
278 p_start = this_line;
279 p_sline = p_input_line;
280 retval = 0;
281 goto scan_exit;
282 }
283 }
284 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) {
285 if (*s == '\t')
286 indent += 8 - (indent % 8);
287 else
288 indent++;
289 }
290 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++)
291 ;
292 this_is_a_command = (isdigit((unsigned char)*s) &&
293 (*t == 'd' || *t == 'c' || *t == 'a'));
294 if (first_command_line < 0L && this_is_a_command) {
295 first_command_line = this_line;
296 fcl_line = p_input_line;
297 p_indent = indent; /* assume this for now */
298 }
299 if (!stars_last_line && strnEQ(s, "*** ", 4))
300 names[OLD_FILE].path = fetchname(s + 4,
301 &names[OLD_FILE].exists, strippath);
302 else if (strnEQ(s, "--- ", 4))
303 names[NEW_FILE].path = fetchname(s + 4,
304 &names[NEW_FILE].exists, strippath);
305 else if (strnEQ(s, "+++ ", 4))
306 /* pretend it is the old name */
307 names[OLD_FILE].path = fetchname(s + 4,
308 &names[OLD_FILE].exists, strippath);
309 else if (strnEQ(s, "Index:", 6))
310 names[INDEX_FILE].path = fetchname(s + 6,
311 &names[INDEX_FILE].exists, strippath);
312 else if (strnEQ(s, "Prereq:", 7)) {
313 for (t = s + 7; isspace((unsigned char)*t); t++)
314 ;
315 revision = savestr(t);
316 for (t = revision; *t && !isspace((unsigned char)*t); t++)
317 ;
318 *t = '\0';
319 if (*revision == '\0') {
320 free(revision);
321 revision = NULL;
322 }
323 }
324 if ((!diff_type || diff_type == ED_DIFF) &&
325 first_command_line >= 0L &&
326 strEQ(s, ".\n")) {
327 p_indent = indent;
328 p_start = first_command_line;
329 p_sline = fcl_line;
330 retval = ED_DIFF;
331 goto scan_exit;
332 }
333 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) {
334 if (strnEQ(s + 4, "0,0", 3))
335 ok_to_create_file = true;
336 p_indent = indent;
337 p_start = this_line;
338 p_sline = p_input_line;
339 retval = UNI_DIFF;
340 goto scan_exit;
341 }
342 stars_this_line = strnEQ(s, "********", 8);
343 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line &&
344 strnEQ(s, "*** ", 4)) {
345 if (atol(s + 4) == 0)
346 ok_to_create_file = true;
347 /*
348 * If this is a new context diff the character just
349 * before the newline is a '*'.
350 */
351 while (*s != '\n')
352 s++;
353 p_indent = indent;
354 p_start = previous_line;
355 p_sline = p_input_line - 1;
356 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF);
357 goto scan_exit;
358 }
359 if ((!diff_type || diff_type == NORMAL_DIFF) &&
360 last_line_was_command &&
361 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) {
362 p_start = previous_line;
363 p_sline = p_input_line - 1;
364 p_indent = indent;
365 retval = NORMAL_DIFF;
366 goto scan_exit;
367 }
368 }
369 scan_exit:
370 if (retval == UNI_DIFF) {
371 /* unswap old and new */
372 struct file_name tmp = names[OLD_FILE];
373 names[OLD_FILE] = names[NEW_FILE];
374 names[NEW_FILE] = tmp;
375 }
376 if (filearg[0] == NULL) {
377 if (posix)
378 filearg[0] = posix_name(names, ok_to_create_file);
379 else {
380 /* Ignore the Index: name for context diffs, like GNU */
381 if (names[OLD_FILE].path != NULL ||
382 names[NEW_FILE].path != NULL) {
383 free(names[INDEX_FILE].path);
384 names[INDEX_FILE].path = NULL;
385 }
386 filearg[0] = best_name(names, ok_to_create_file);
387 }
388 }
389
390 free(bestguess);
391 bestguess = NULL;
392 if (filearg[0] != NULL)
393 bestguess = savestr(filearg[0]);
394 else if (!ok_to_create_file) {
395 /*
396 * We don't want to create a new file but we need a
397 * filename to set bestguess. Avoid setting filearg[0]
398 * so the file is not created automatically.
399 */
400 if (posix)
401 bestguess = posix_name(names, true);
402 else
403 bestguess = best_name(names, true);
404 }
405 free(names[OLD_FILE].path);
406 free(names[NEW_FILE].path);
407 free(names[INDEX_FILE].path);
408 return retval;
409 }
410
411 /*
412 * Remember where this patch ends so we know where to start up again.
413 */
414 static void
415 next_intuit_at(LINENUM file_pos, LINENUM file_line)
416 {
417 p_base = file_pos;
418 p_bline = file_line;
419 }
420
421 /*
422 * Basically a verbose fseek() to the actual diff listing.
423 */
424 static void
425 skip_to(LINENUM file_pos, LINENUM file_line)
426 {
427 char *ret;
428
429 if (p_base > file_pos)
430 fatal("Internal error: seek %ld>%ld\n", p_base, file_pos);
431 if (verbose && p_base < file_pos) {
432 fseek(pfp, p_base, SEEK_SET);
433 say("The text leading up to this was:\n--------------------------\n");
434 while (ftell(pfp) < file_pos) {
435 ret = fgets(buf, buf_len, pfp);
436 if (ret == NULL)
437 fatal("Unexpected end of file\n");
438 say("|%s", buf);
439 }
440 say("--------------------------\n");
441 } else
442 fseek(pfp, file_pos, SEEK_SET);
443 p_input_line = file_line - 1;
444 }
445
446 /* Make this a function for better debugging. */
447 static void
448 malformed(void)
449 {
450 fatal("malformed patch at line %ld: %s", p_input_line, buf);
451 /* about as informative as "Syntax error" in C */
452 }
453
454 /*
455 * True if the line has been discarded (i.e. it is a line saying
456 * "\ No newline at end of file".)
457 */
458 static bool
459 remove_special_line(void)
460 {
461 int c;
462
463 c = fgetc(pfp);
464 if (c == '\\') {
465 do {
466 c = fgetc(pfp);
467 } while (c != EOF && c != '\n');
468
469 return true;
470 }
471 if (c != EOF)
472 fseek(pfp, -1L, SEEK_CUR);
473
474 return false;
475 }
476
477 /*
478 * True if there is more of the current diff listing to process.
479 */
480 bool
481 another_hunk(void)
482 {
483 long line_beginning; /* file pos of the current line */
484 LINENUM repl_beginning; /* index of --- line */
485 LINENUM fillcnt; /* #lines of missing ptrn or repl */
486 LINENUM fillsrc; /* index of first line to copy */
487 LINENUM filldst; /* index of first missing line */
488 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */
489 bool repl_could_be_missing; /* no + or ! lines in this hunk */
490 bool repl_missing; /* we are now backtracking */
491 long repl_backtrack_position; /* file pos of first repl line */
492 LINENUM repl_patch_line; /* input line number for same */
493 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */
494 char *s, *ret;
495 int context = 0;
496
497 while (p_end >= 0) {
498 if (p_end == p_efake)
499 p_end = p_bfake; /* don't free twice */
500 else
501 free(p_line[p_end]);
502 p_end--;
503 }
504 p_efake = -1;
505
506 p_max = hunkmax; /* gets reduced when --- found */
507 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) {
508 line_beginning = ftell(pfp);
509 repl_beginning = 0;
510 fillcnt = 0;
511 fillsrc = 0;
512 filldst = 0;
513 ptrn_spaces_eaten = false;
514 repl_could_be_missing = true;
515 repl_missing = false;
516 repl_backtrack_position = 0;
517 repl_patch_line = 0;
518 ptrn_copiable = 0;
519
520 ret = pgets(buf, buf_len, pfp);
521 p_input_line++;
522 if (ret == NULL || strnNE(buf, "********", 8)) {
523 next_intuit_at(line_beginning, p_input_line);
524 return false;
525 }
526 p_context = 100;
527 p_hunk_beg = p_input_line + 1;
528 while (p_end < p_max) {
529 line_beginning = ftell(pfp);
530 ret = pgets(buf, buf_len, pfp);
531 p_input_line++;
532 if (ret == NULL) {
533 if (p_max - p_end < 4) {
534 /* assume blank lines got chopped */
535 strlcpy(buf, " \n", buf_len);
536 } else {
537 if (repl_beginning && repl_could_be_missing) {
538 repl_missing = true;
539 goto hunk_done;
540 }
541 fatal("unexpected end of file in patch\n");
542 }
543 }
544 p_end++;
545 if (p_end >= hunkmax)
546 fatal("Internal error: hunk larger than hunk "
547 "buffer size");
548 p_char[p_end] = *buf;
549 p_line[p_end] = NULL;
550 switch (*buf) {
551 case '*':
552 if (strnEQ(buf, "********", 8)) {
553 if (repl_beginning && repl_could_be_missing) {
554 repl_missing = true;
555 goto hunk_done;
556 } else
557 fatal("unexpected end of hunk "
558 "at line %ld\n",
559 p_input_line);
560 }
561 if (p_end != 0) {
562 if (repl_beginning && repl_could_be_missing) {
563 repl_missing = true;
564 goto hunk_done;
565 }
566 fatal("unexpected *** at line %ld: %s",
567 p_input_line, buf);
568 }
569 context = 0;
570 p_line[p_end] = savestr(buf);
571 if (out_of_mem) {
572 p_end--;
573 return false;
574 }
575 for (s = buf; *s && !isdigit((unsigned char)*s); s++)
576 ;
577 if (!*s)
578 malformed();
579 if (strnEQ(s, "0,0", 3))
580 memmove(s, s + 2, strlen(s + 2) + 1);
581 p_first = (LINENUM) atol(s);
582 while (isdigit((unsigned char)*s))
583 s++;
584 if (*s == ',') {
585 for (; *s && !isdigit((unsigned char)*s); s++)
586 ;
587 if (!*s)
588 malformed();
589 p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1;
590 } else if (p_first)
591 p_ptrn_lines = 1;
592 else {
593 p_ptrn_lines = 0;
594 p_first = 1;
595 }
596
597 /* we need this much at least */
598 p_max = p_ptrn_lines + 6;
599 while (p_max >= hunkmax)
600 grow_hunkmax();
601 p_max = hunkmax;
602 break;
603 case '-':
604 if (buf[1] == '-') {
605 if (repl_beginning ||
606 (p_end != p_ptrn_lines + 1 +
607 (p_char[p_end - 1] == '\n'))) {
608 if (p_end == 1) {
609 /*
610 * `old' lines were omitted;
611 * set up to fill them in
612 * from 'new' context lines.
613 */
614 p_end = p_ptrn_lines + 1;
615 fillsrc = p_end + 1;
616 filldst = 1;
617 fillcnt = p_ptrn_lines;
618 } else {
619 if (repl_beginning) {
620 if (repl_could_be_missing) {
621 repl_missing = true;
622 goto hunk_done;
623 }
624 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n",
625 p_input_line, p_hunk_beg + repl_beginning);
626 } else {
627 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n",
628 (p_end <= p_ptrn_lines
629 ? "Premature"
630 : "Overdue"),
631 p_input_line, p_hunk_beg);
632 }
633 }
634 }
635 repl_beginning = p_end;
636 repl_backtrack_position = ftell(pfp);
637 repl_patch_line = p_input_line;
638 p_line[p_end] = savestr(buf);
639 if (out_of_mem) {
640 p_end--;
641 return false;
642 }
643 p_char[p_end] = '=';
644 for (s = buf; *s && !isdigit((unsigned char)*s); s++)
645 ;
646 if (!*s)
647 malformed();
648 p_newfirst = (LINENUM) atol(s);
649 while (isdigit((unsigned char)*s))
650 s++;
651 if (*s == ',') {
652 for (; *s && !isdigit((unsigned char)*s); s++)
653 ;
654 if (!*s)
655 malformed();
656 p_repl_lines = ((LINENUM) atol(s)) -
657 p_newfirst + 1;
658 } else if (p_newfirst)
659 p_repl_lines = 1;
660 else {
661 p_repl_lines = 0;
662 p_newfirst = 1;
663 }
664 p_max = p_repl_lines + p_end;
665 if (p_max > MAXHUNKSIZE)
666 fatal("hunk too large (%ld lines) at line %ld: %s",
667 p_max, p_input_line, buf);
668 while (p_max >= hunkmax)
669 grow_hunkmax();
670 if (p_repl_lines != ptrn_copiable &&
671 (p_context != 0 || p_repl_lines != 1))
672 repl_could_be_missing = false;
673 break;
674 }
675 goto change_line;
676 case '+':
677 case '!':
678 repl_could_be_missing = false;
679 change_line:
680 if (buf[1] == '\n' && canonicalize)
681 strlcpy(buf + 1, " \n", buf_len - 1);
682 if (!isspace((unsigned char)buf[1]) && buf[1] != '>' &&
683 buf[1] != '<' &&
684 repl_beginning && repl_could_be_missing) {
685 repl_missing = true;
686 goto hunk_done;
687 }
688 if (context >= 0) {
689 if (context < p_context)
690 p_context = context;
691 context = -1000;
692 }
693 p_line[p_end] = savestr(buf + 2);
694 if (out_of_mem) {
695 p_end--;
696 return false;
697 }
698 if (p_end == p_ptrn_lines) {
699 if (remove_special_line()) {
700 int len;
701
702 len = strlen(p_line[p_end]) - 1;
703 (p_line[p_end])[len] = 0;
704 }
705 }
706 break;
707 case '\t':
708 case '\n': /* assume the 2 spaces got eaten */
709 if (repl_beginning && repl_could_be_missing &&
710 (!ptrn_spaces_eaten ||
711 diff_type == NEW_CONTEXT_DIFF)) {
712 repl_missing = true;
713 goto hunk_done;
714 }
715 p_line[p_end] = savestr(buf);
716 if (out_of_mem) {
717 p_end--;
718 return false;
719 }
720 if (p_end != p_ptrn_lines + 1) {
721 ptrn_spaces_eaten |= (repl_beginning != 0);
722 context++;
723 if (!repl_beginning)
724 ptrn_copiable++;
725 p_char[p_end] = ' ';
726 }
727 break;
728 case ' ':
729 if (!isspace((unsigned char)buf[1]) &&
730 repl_beginning && repl_could_be_missing) {
731 repl_missing = true;
732 goto hunk_done;
733 }
734 context++;
735 if (!repl_beginning)
736 ptrn_copiable++;
737 p_line[p_end] = savestr(buf + 2);
738 if (out_of_mem) {
739 p_end--;
740 return false;
741 }
742 break;
743 default:
744 if (repl_beginning && repl_could_be_missing) {
745 repl_missing = true;
746 goto hunk_done;
747 }
748 malformed();
749 }
750 /* set up p_len for strncmp() so we don't have to */
751 /* assume null termination */
752 if (p_line[p_end])
753 p_len[p_end] = strlen(p_line[p_end]);
754 else
755 p_len[p_end] = 0;
756 }
757
758 hunk_done:
759 if (p_end >= 0 && !repl_beginning)
760 fatal("no --- found in patch at line %ld\n", pch_hunk_beg());
761
762 if (repl_missing) {
763
764 /* reset state back to just after --- */
765 p_input_line = repl_patch_line;
766 for (p_end--; p_end > repl_beginning; p_end--)
767 free(p_line[p_end]);
768 fseek(pfp, repl_backtrack_position, SEEK_SET);
769
770 /* redundant 'new' context lines were omitted - set */
771 /* up to fill them in from the old file context */
772 if (!p_context && p_repl_lines == 1) {
773 p_repl_lines = 0;
774 p_max--;
775 }
776 fillsrc = 1;
777 filldst = repl_beginning + 1;
778 fillcnt = p_repl_lines;
779 p_end = p_max;
780 } else if (!p_context && fillcnt == 1) {
781 /* the first hunk was a null hunk with no context */
782 /* and we were expecting one line -- fix it up. */
783 while (filldst < p_end) {
784 p_line[filldst] = p_line[filldst + 1];
785 p_char[filldst] = p_char[filldst + 1];
786 p_len[filldst] = p_len[filldst + 1];
787 filldst++;
788 }
789 #if 0
790 repl_beginning--; /* this doesn't need to be fixed */
791 #endif
792 p_end--;
793 p_first++; /* do append rather than insert */
794 fillcnt = 0;
795 p_ptrn_lines = 0;
796 }
797 if (diff_type == CONTEXT_DIFF &&
798 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) {
799 if (verbose)
800 say("%s\n%s\n%s\n",
801 "(Fascinating--this is really a new-style context diff but without",
802 "the telltale extra asterisks on the *** line that usually indicate",
803 "the new style...)");
804 diff_type = NEW_CONTEXT_DIFF;
805 }
806 /* if there were omitted context lines, fill them in now */
807 if (fillcnt) {
808 p_bfake = filldst; /* remember where not to free() */
809 p_efake = filldst + fillcnt - 1;
810 while (fillcnt-- > 0) {
811 while (fillsrc <= p_end && p_char[fillsrc] != ' ')
812 fillsrc++;
813 if (fillsrc > p_end)
814 fatal("replacement text or line numbers mangled in hunk at line %ld\n",
815 p_hunk_beg);
816 p_line[filldst] = p_line[fillsrc];
817 p_char[filldst] = p_char[fillsrc];
818 p_len[filldst] = p_len[fillsrc];
819 fillsrc++;
820 filldst++;
821 }
822 while (fillsrc <= p_end && fillsrc != repl_beginning &&
823 p_char[fillsrc] != ' ')
824 fillsrc++;
825 #ifdef DEBUGGING
826 if (debug & 64)
827 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n",
828 fillsrc, filldst, repl_beginning, p_end + 1);
829 #endif
830 if (fillsrc != p_end + 1 && fillsrc != repl_beginning)
831 malformed();
832 if (filldst != p_end + 1 && filldst != repl_beginning)
833 malformed();
834 }
835 if (p_line[p_end] != NULL) {
836 if (remove_special_line()) {
837 p_len[p_end] -= 1;
838 (p_line[p_end])[p_len[p_end]] = 0;
839 }
840 }
841 } else if (diff_type == UNI_DIFF) {
842 LINENUM fillold; /* index of old lines */
843 LINENUM fillnew; /* index of new lines */
844 char ch;
845
846 line_beginning = ftell(pfp); /* file pos of the current line */
847 ret = pgets(buf, buf_len, pfp);
848 p_input_line++;
849 if (ret == NULL || strnNE(buf, "@@ -", 4)) {
850 next_intuit_at(line_beginning, p_input_line);
851 return false;
852 }
853 s = buf + 4;
854 if (!*s)
855 malformed();
856 p_first = (LINENUM) atol(s);
857 while (isdigit((unsigned char)*s))
858 s++;
859 if (*s == ',') {
860 p_ptrn_lines = (LINENUM) atol(++s);
861 while (isdigit((unsigned char)*s))
862 s++;
863 } else
864 p_ptrn_lines = 1;
865 if (*s == ' ')
866 s++;
867 if (*s != '+' || !*++s)
868 malformed();
869 p_newfirst = (LINENUM) atol(s);
870 while (isdigit((unsigned char)*s))
871 s++;
872 if (*s == ',') {
873 p_repl_lines = (LINENUM) atol(++s);
874 while (isdigit((unsigned char)*s))
875 s++;
876 } else
877 p_repl_lines = 1;
878 if (*s == ' ')
879 s++;
880 if (*s != '@')
881 malformed();
882 if (!p_ptrn_lines)
883 p_first++; /* do append rather than insert */
884 p_max = p_ptrn_lines + p_repl_lines + 1;
885 while (p_max >= hunkmax)
886 grow_hunkmax();
887 fillold = 1;
888 fillnew = fillold + p_ptrn_lines;
889 p_end = fillnew + p_repl_lines;
890 snprintf(buf, buf_len, "*** %ld,%ld ****\n", p_first,
891 p_first + p_ptrn_lines - 1);
892 p_line[0] = savestr(buf);
893 if (out_of_mem) {
894 p_end = -1;
895 return false;
896 }
897 p_char[0] = '*';
898 snprintf(buf, buf_len, "--- %ld,%ld ----\n", p_newfirst,
899 p_newfirst + p_repl_lines - 1);
900 p_line[fillnew] = savestr(buf);
901 if (out_of_mem) {
902 p_end = 0;
903 return false;
904 }
905 p_char[fillnew++] = '=';
906 p_context = 100;
907 context = 0;
908 p_hunk_beg = p_input_line + 1;
909 while (fillold <= p_ptrn_lines || fillnew <= p_end) {
910 line_beginning = ftell(pfp);
911 ret = pgets(buf, buf_len, pfp);
912 p_input_line++;
913 if (ret == NULL) {
914 if (p_max - fillnew < 3) {
915 /* assume blank lines got chopped */
916 strlcpy(buf, " \n", buf_len);
917 } else {
918 fatal("unexpected end of file in patch\n");
919 }
920 }
921 if (*buf == '\t' || *buf == '\n') {
922 ch = ' '; /* assume the space got eaten */
923 s = savestr(buf);
924 } else {
925 ch = *buf;
926 s = savestr(buf + 1);
927 }
928 if (out_of_mem) {
929 while (--fillnew > p_ptrn_lines)
930 free(p_line[fillnew]);
931 p_end = fillold - 1;
932 return false;
933 }
934 switch (ch) {
935 case '-':
936 if (fillold > p_ptrn_lines) {
937 free(s);
938 p_end = fillnew - 1;
939 malformed();
940 }
941 p_char[fillold] = ch;
942 p_line[fillold] = s;
943 p_len[fillold++] = strlen(s);
944 if (fillold > p_ptrn_lines) {
945 if (remove_special_line()) {
946 p_len[fillold - 1] -= 1;
947 s[p_len[fillold - 1]] = 0;
948 }
949 }
950 break;
951 case '=':
952 ch = ' ';
953 /* FALL THROUGH */
954 case ' ':
955 if (fillold > p_ptrn_lines) {
956 free(s);
957 while (--fillnew > p_ptrn_lines)
958 free(p_line[fillnew]);
959 p_end = fillold - 1;
960 malformed();
961 }
962 context++;
963 p_char[fillold] = ch;
964 p_line[fillold] = s;
965 p_len[fillold++] = strlen(s);
966 s = savestr(s);
967 if (out_of_mem) {
968 while (--fillnew > p_ptrn_lines)
969 free(p_line[fillnew]);
970 p_end = fillold - 1;
971 return false;
972 }
973 if (fillold > p_ptrn_lines) {
974 if (remove_special_line()) {
975 p_len[fillold - 1] -= 1;
976 s[p_len[fillold - 1]] = 0;
977 }
978 }
979 /* FALL THROUGH */
980 case '+':
981 if (fillnew > p_end) {
982 free(s);
983 while (--fillnew > p_ptrn_lines)
984 free(p_line[fillnew]);
985 p_end = fillold - 1;
986 malformed();
987 }
988 p_char[fillnew] = ch;
989 p_line[fillnew] = s;
990 p_len[fillnew++] = strlen(s);
991 if (fillold > p_ptrn_lines) {
992 if (remove_special_line()) {
993 p_len[fillnew - 1] -= 1;
994 s[p_len[fillnew - 1]] = 0;
995 }
996 }
997 break;
998 default:
999 p_end = fillnew;
1000 malformed();
1001 }
1002 if (ch != ' ' && context > 0) {
1003 if (context < p_context)
1004 p_context = context;
1005 context = -1000;
1006 }
1007 } /* while */
1008 } else { /* normal diff--fake it up */
1009 char hunk_type;
1010 int i;
1011 LINENUM min, max;
1012
1013 line_beginning = ftell(pfp);
1014 p_context = 0;
1015 ret = pgets(buf, buf_len, pfp);
1016 p_input_line++;
1017 if (ret == NULL || !isdigit((unsigned char)*buf)) {
1018 next_intuit_at(line_beginning, p_input_line);
1019 return false;
1020 }
1021 p_first = (LINENUM) atol(buf);
1022 for (s = buf; isdigit((unsigned char)*s); s++)
1023 ;
1024 if (*s == ',') {
1025 p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1;
1026 while (isdigit((unsigned char)*s))
1027 s++;
1028 } else
1029 p_ptrn_lines = (*s != 'a');
1030 hunk_type = *s;
1031 if (hunk_type == 'a')
1032 p_first++; /* do append rather than insert */
1033 min = (LINENUM) atol(++s);
1034 for (; isdigit((unsigned char)*s); s++)
1035 ;
1036 if (*s == ',')
1037 max = (LINENUM) atol(++s);
1038 else
1039 max = min;
1040 if (hunk_type == 'd')
1041 min++;
1042 p_end = p_ptrn_lines + 1 + max - min + 1;
1043 if (p_end > MAXHUNKSIZE)
1044 fatal("hunk too large (%ld lines) at line %ld: %s",
1045 p_end, p_input_line, buf);
1046 while (p_end >= hunkmax)
1047 grow_hunkmax();
1048 p_newfirst = min;
1049 p_repl_lines = max - min + 1;
1050 snprintf(buf, buf_len, "*** %ld,%ld\n", p_first,
1051 p_first + p_ptrn_lines - 1);
1052 p_line[0] = savestr(buf);
1053 if (out_of_mem) {
1054 p_end = -1;
1055 return false;
1056 }
1057 p_char[0] = '*';
1058 for (i = 1; i <= p_ptrn_lines; i++) {
1059 ret = pgets(buf, buf_len, pfp);
1060 p_input_line++;
1061 if (ret == NULL)
1062 fatal("unexpected end of file in patch at line %ld\n",
1063 p_input_line);
1064 if (*buf != '<')
1065 fatal("< expected at line %ld of patch\n",
1066 p_input_line);
1067 p_line[i] = savestr(buf + 2);
1068 if (out_of_mem) {
1069 p_end = i - 1;
1070 return false;
1071 }
1072 p_len[i] = strlen(p_line[i]);
1073 p_char[i] = '-';
1074 }
1075
1076 if (remove_special_line()) {
1077 p_len[i - 1] -= 1;
1078 (p_line[i - 1])[p_len[i - 1]] = 0;
1079 }
1080 if (hunk_type == 'c') {
1081 ret = pgets(buf, buf_len, pfp);
1082 p_input_line++;
1083 if (ret == NULL)
1084 fatal("unexpected end of file in patch at line %ld\n",
1085 p_input_line);
1086 if (*buf != '-')
1087 fatal("--- expected at line %ld of patch\n",
1088 p_input_line);
1089 }
1090 snprintf(buf, buf_len, "--- %ld,%ld\n", min, max);
1091 p_line[i] = savestr(buf);
1092 if (out_of_mem) {
1093 p_end = i - 1;
1094 return false;
1095 }
1096 p_char[i] = '=';
1097 for (i++; i <= p_end; i++) {
1098 ret = pgets(buf, buf_len, pfp);
1099 p_input_line++;
1100 if (ret == NULL)
1101 fatal("unexpected end of file in patch at line %ld\n",
1102 p_input_line);
1103 if (*buf != '>')
1104 fatal("> expected at line %ld of patch\n",
1105 p_input_line);
1106 p_line[i] = savestr(buf + 2);
1107 if (out_of_mem) {
1108 p_end = i - 1;
1109 return false;
1110 }
1111 p_len[i] = strlen(p_line[i]);
1112 p_char[i] = '+';
1113 }
1114
1115 if (remove_special_line()) {
1116 p_len[i - 1] -= 1;
1117 (p_line[i - 1])[p_len[i - 1]] = 0;
1118 }
1119 }
1120 if (reverse) /* backwards patch? */
1121 if (!pch_swap())
1122 say("Not enough memory to swap next hunk!\n");
1123 #ifdef DEBUGGING
1124 if (debug & 2) {
1125 int i;
1126 char special;
1127
1128 for (i = 0; i <= p_end; i++) {
1129 if (i == p_ptrn_lines)
1130 special = '^';
1131 else
1132 special = ' ';
1133 fprintf(stderr, "%3d %c %c %s", i, p_char[i],
1134 special, p_line[i]);
1135 fflush(stderr);
1136 }
1137 }
1138 #endif
1139 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */
1140 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */
1141 return true;
1142 }
1143
1144 /*
1145 * Input a line from the patch file, worrying about indentation.
1146 */
1147 static char *
1148 pgets(char *bf, int sz, FILE *fp)
1149 {
1150 char *s, *ret = fgets(bf, sz, fp);
1151 int indent = 0;
1152
1153 if (p_indent && ret != NULL) {
1154 for (s = buf;
1155 indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X');
1156 s++) {
1157 if (*s == '\t')
1158 indent += 8 - (indent % 7);
1159 else
1160 indent++;
1161 }
1162 if (buf != s && strlcpy(buf, s, buf_len) >= buf_len)
1163 fatal("buffer too small in pgets()\n");
1164 }
1165 return ret;
1166 }
1167
1168 /*
1169 * Reverse the old and new portions of the current hunk.
1170 */
1171 bool
1172 pch_swap(void)
1173 {
1174 char **tp_line; /* the text of the hunk */
1175 short *tp_len; /* length of each line */
1176 char *tp_char; /* +, -, and ! */
1177 LINENUM i;
1178 LINENUM n;
1179 bool blankline = false;
1180 char *s;
1181
1182 i = p_first;
1183 p_first = p_newfirst;
1184 p_newfirst = i;
1185
1186 /* make a scratch copy */
1187
1188 tp_line = p_line;
1189 tp_len = p_len;
1190 tp_char = p_char;
1191 p_line = NULL; /* force set_hunkmax to allocate again */
1192 p_len = NULL;
1193 p_char = NULL;
1194 set_hunkmax();
1195 if (p_line == NULL || p_len == NULL || p_char == NULL) {
1196
1197 free(p_line);
1198 p_line = tp_line;
1199 free(p_len);
1200 p_len = tp_len;
1201 free(p_char);
1202 p_char = tp_char;
1203 return false; /* not enough memory to swap hunk! */
1204 }
1205 /* now turn the new into the old */
1206
1207 i = p_ptrn_lines + 1;
1208 if (tp_char[i] == '\n') { /* account for possible blank line */
1209 blankline = true;
1210 i++;
1211 }
1212 if (p_efake >= 0) { /* fix non-freeable ptr range */
1213 if (p_efake <= i)
1214 n = p_end - i + 1;
1215 else
1216 n = -i;
1217 p_efake += n;
1218 p_bfake += n;
1219 }
1220 for (n = 0; i <= p_end; i++, n++) {
1221 p_line[n] = tp_line[i];
1222 p_char[n] = tp_char[i];
1223 if (p_char[n] == '+')
1224 p_char[n] = '-';
1225 p_len[n] = tp_len[i];
1226 }
1227 if (blankline) {
1228 i = p_ptrn_lines + 1;
1229 p_line[n] = tp_line[i];
1230 p_char[n] = tp_char[i];
1231 p_len[n] = tp_len[i];
1232 n++;
1233 }
1234 if (p_char[0] != '=')
1235 fatal("Malformed patch at line %ld: expected '=' found '%c'\n",
1236 p_input_line, p_char[0]);
1237 p_char[0] = '*';
1238 for (s = p_line[0]; *s; s++)
1239 if (*s == '-')
1240 *s = '*';
1241
1242 /* now turn the old into the new */
1243
1244 if (p_char[0] != '*')
1245 fatal("Malformed patch at line %ld: expected '*' found '%c'\n",
1246 p_input_line, p_char[0]);
1247 tp_char[0] = '=';
1248 for (s = tp_line[0]; *s; s++)
1249 if (*s == '*')
1250 *s = '-';
1251 for (i = 0; n <= p_end; i++, n++) {
1252 p_line[n] = tp_line[i];
1253 p_char[n] = tp_char[i];
1254 if (p_char[n] == '-')
1255 p_char[n] = '+';
1256 p_len[n] = tp_len[i];
1257 }
1258
1259 if (i != p_ptrn_lines + 1)
1260 fatal("Malformed patch at line %ld: expected %ld lines, "
1261 "got %ld\n",
1262 p_input_line, p_ptrn_lines + 1, i);
1263
1264 i = p_ptrn_lines;
1265 p_ptrn_lines = p_repl_lines;
1266 p_repl_lines = i;
1267
1268 free(tp_line);
1269 free(tp_len);
1270 free(tp_char);
1271
1272 return true;
1273 }
1274
1275 /*
1276 * Return the specified line position in the old file of the old context.
1277 */
1278 LINENUM
1279 pch_first(void)
1280 {
1281 return p_first;
1282 }
1283
1284 /*
1285 * Return the number of lines of old context.
1286 */
1287 LINENUM
1288 pch_ptrn_lines(void)
1289 {
1290 return p_ptrn_lines;
1291 }
1292
1293 /*
1294 * Return the probable line position in the new file of the first line.
1295 */
1296 LINENUM
1297 pch_newfirst(void)
1298 {
1299 return p_newfirst;
1300 }
1301
1302 /*
1303 * Return the number of lines in the replacement text including context.
1304 */
1305 LINENUM
1306 pch_repl_lines(void)
1307 {
1308 return p_repl_lines;
1309 }
1310
1311 /*
1312 * Return the number of lines in the whole hunk.
1313 */
1314 LINENUM
1315 pch_end(void)
1316 {
1317 return p_end;
1318 }
1319
1320 /*
1321 * Return the number of context lines before the first changed line.
1322 */
1323 LINENUM
1324 pch_context(void)
1325 {
1326 return p_context;
1327 }
1328
1329 /*
1330 * Return the length of a particular patch line.
1331 */
1332 short
1333 pch_line_len(LINENUM line)
1334 {
1335 return p_len[line];
1336 }
1337
1338 /*
1339 * Return the control character (+, -, *, !, etc) for a patch line.
1340 */
1341 char
1342 pch_char(LINENUM line)
1343 {
1344 return p_char[line];
1345 }
1346
1347 /*
1348 * Return a pointer to a particular patch line.
1349 */
1350 char *
1351 pfetch(LINENUM line)
1352 {
1353 return p_line[line];
1354 }
1355
1356 /*
1357 * Return where in the patch file this hunk began, for error messages.
1358 */
1359 LINENUM
1360 pch_hunk_beg(void)
1361 {
1362 return p_hunk_beg;
1363 }
1364
1365 /*
1366 * Apply an ed script by feeding ed itself.
1367 */
1368 void
1369 do_ed_script(void)
1370 {
1371 char *t;
1372 long beginning_of_this_line;
1373 FILE *pipefp = NULL;
1374
1375 if (!skip_rest_of_patch) {
1376 if (copy_file(filearg[0], TMPOUTNAME) < 0) {
1377 unlink(TMPOUTNAME);
1378 fatal("can't create temp file %s", TMPOUTNAME);
1379 }
1380 snprintf(buf, buf_len, "%s%s%s", _PATH_ED,
1381 verbose ? " " : " -s ", TMPOUTNAME);
1382 pipefp = popen(buf, "w");
1383 }
1384 for (;;) {
1385 beginning_of_this_line = ftell(pfp);
1386 if (pgets(buf, buf_len, pfp) == NULL) {
1387 next_intuit_at(beginning_of_this_line, p_input_line);
1388 break;
1389 }
1390 p_input_line++;
1391 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++)
1392 ;
1393 /* POSIX defines allowed commands as {a,c,d,i,s} */
1394 if (isdigit((unsigned char)*buf) && (*t == 'a' || *t == 'c' ||
1395 *t == 'd' || *t == 'i' || *t == 's')) {
1396 if (pipefp != NULL)
1397 fputs(buf, pipefp);
1398 if (*t != 'd') {
1399 while (pgets(buf, buf_len, pfp) != NULL) {
1400 p_input_line++;
1401 if (pipefp != NULL)
1402 fputs(buf, pipefp);
1403 if (strEQ(buf, ".\n"))
1404 break;
1405 }
1406 }
1407 } else {
1408 next_intuit_at(beginning_of_this_line, p_input_line);
1409 break;
1410 }
1411 }
1412 if (pipefp == NULL)
1413 return;
1414 fprintf(pipefp, "w\n");
1415 fprintf(pipefp, "q\n");
1416 fflush(pipefp);
1417 pclose(pipefp);
1418 ignore_signals();
1419 if (!check_only) {
1420 if (move_file(TMPOUTNAME, outname) < 0) {
1421 toutkeep = true;
1422 chmod(TMPOUTNAME, filemode);
1423 } else
1424 chmod(outname, filemode);
1425 }
1426 set_signals(1);
1427 }
1428
1429 /*
1430 * Choose the name of the file to be patched based on POSIX rules.
1431 * NOTE: the POSIX rules are amazingly stupid and we only follow them
1432 * if the user specified --posix or set POSIXLY_CORRECT.
1433 */
1434 static char *
1435 posix_name(const struct file_name *names, bool assume_exists)
1436 {
1437 char *path = NULL;
1438 int i;
1439
1440 /*
1441 * POSIX states that the filename will be chosen from one
1442 * of the old, new and index names (in that order) if
1443 * the file exists relative to CWD after -p stripping.
1444 */
1445 for (i = 0; i < MAX_FILE; i++) {
1446 if (names[i].path != NULL && names[i].exists) {
1447 path = names[i].path;
1448 break;
1449 }
1450 }
1451 if (path == NULL && !assume_exists) {
1452 /*
1453 * No files found, look for something we can checkout from
1454 * RCS/SCCS dirs. Same order as above.
1455 */
1456 for (i = 0; i < MAX_FILE; i++) {
1457 if (names[i].path != NULL &&
1458 (path = checked_in(names[i].path)) != NULL)
1459 break;
1460 }
1461 /*
1462 * Still no match? Check to see if the diff could be creating
1463 * a new file.
1464 */
1465 if (path == NULL && ok_to_create_file &&
1466 names[NEW_FILE].path != NULL)
1467 path = names[NEW_FILE].path;
1468 }
1469
1470 return path ? savestr(path) : NULL;
1471 }
1472
1473 /*
1474 * Choose the name of the file to be patched based the "best" one
1475 * available.
1476 */
1477 static char *
1478 best_name(const struct file_name *names, bool assume_exists)
1479 {
1480 size_t min_components, min_baselen, min_len, tmp;
1481 char *best = NULL;
1482 int i;
1483
1484 /*
1485 * The "best" name is the one with the fewest number of path
1486 * components, the shortest basename length, and the shortest
1487 * overall length (in that order). We only use the Index: file
1488 * if neither of the old or new files could be intuited from
1489 * the diff header.
1490 */
1491 min_components = min_baselen = min_len = SIZE_MAX;
1492 for (i = INDEX_FILE; i >= OLD_FILE; i--) {
1493 if (names[i].path == NULL ||
1494 (!names[i].exists && !assume_exists))
1495 continue;
1496 if ((tmp = num_components(names[i].path)) > min_components)
1497 continue;
1498 min_components = tmp;
1499 if ((tmp = strlen(basename(names[i].path))) > min_baselen)
1500 continue;
1501 min_baselen = tmp;
1502 if ((tmp = strlen(names[i].path)) > min_len)
1503 continue;
1504 min_len = tmp;
1505 best = names[i].path;
1506 }
1507 if (best == NULL) {
1508 /*
1509 * No files found, look for something we can checkout from
1510 * RCS/SCCS dirs. Logic is identical to that above...
1511 */
1512 min_components = min_baselen = min_len = SIZE_MAX;
1513 for (i = INDEX_FILE; i >= OLD_FILE; i--) {
1514 if (names[i].path == NULL ||
1515 checked_in(names[i].path) == NULL)
1516 continue;
1517 if ((tmp = num_components(names[i].path)) > min_components)
1518 continue;
1519 min_components = tmp;
1520 if ((tmp = strlen(basename(names[i].path))) > min_baselen)
1521 continue;
1522 min_baselen = tmp;
1523 if ((tmp = strlen(names[i].path)) > min_len)
1524 continue;
1525 min_len = tmp;
1526 best = names[i].path;
1527 }
1528 /*
1529 * Still no match? Check to see if the diff could be creating
1530 * a new file.
1531 */
1532 if (best == NULL && ok_to_create_file &&
1533 names[NEW_FILE].path != NULL)
1534 best = names[NEW_FILE].path;
1535 }
1536
1537 return best ? savestr(best) : NULL;
1538 }
1539
1540 static size_t
1541 num_components(const char *path)
1542 {
1543 size_t n;
1544 const char *cp;
1545
1546 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) {
1547 while (*cp == '/')
1548 cp++; /* skip consecutive slashes */
1549 }
1550 return n;
1551 }
DragonFly BSD