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More minor IPI work.
[dragonfly/vkernel-mp.git] / usr.bin / patch / pch.c
blob9d77f5c32627e302e00b81330c1a1abef2176b84
1 /*
2 * $OpenBSD: pch.c,v 1.35 2004/08/05 21:47:24 deraadt Exp $
3 * $DragonFly: src/usr.bin/patch/pch.c,v 1.4 2006/04/19 00:11:35 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 fclose(pfp);
113 filename = TMPPATNAME;
114 }
115 pfp = fopen(filename, "r");
116 if (pfp == NULL)
117 pfatal("patch file %s not found", filename);
118 fstat(fileno(pfp), &filestat);
119 p_filesize = filestat.st_size;
120 next_intuit_at(0L, 1L); /* start at the beginning */
121 set_hunkmax();
122 }
123
124 /*
125 * Make sure our dynamically realloced tables are malloced to begin with.
126 */
127 void
128 set_hunkmax(void)
129 {
130 if (p_line == NULL)
131 p_line = malloc((size_t) hunkmax * sizeof(char *));
132 if (p_len == NULL)
133 p_len = malloc((size_t) hunkmax * sizeof(short));
134 if (p_char == NULL)
135 p_char = malloc((size_t) hunkmax * sizeof(char));
136 }
137
138 /*
139 * Enlarge the arrays containing the current hunk of patch.
140 */
141 static void
142 grow_hunkmax(void)
143 {
144 int new_hunkmax;
145 char **new_p_line;
146 short *new_p_len;
147 char *new_p_char;
148
149 new_hunkmax = hunkmax * 2;
150
151 if (p_line == NULL || p_len == NULL || p_char == NULL)
152 fatal("Internal memory allocation error\n");
153
154 new_p_line = realloc(p_line, new_hunkmax * sizeof(char *));
155 if (new_p_line == NULL)
156 free(p_line);
157
158 new_p_len = realloc(p_len, new_hunkmax * sizeof(short));
159 if (new_p_len == NULL)
160 free(p_len);
161
162 new_p_char = realloc(p_char, new_hunkmax * sizeof(char));
163 if (new_p_char == NULL)
164 free(p_char);
165
166 p_char = new_p_char;
167 p_len = new_p_len;
168 p_line = new_p_line;
169
170 if (p_line != NULL && p_len != NULL && p_char != NULL) {
171 hunkmax = new_hunkmax;
172 return;
173 }
174
175 if (!using_plan_a)
176 fatal("out of memory\n");
177 out_of_mem = true; /* whatever is null will be allocated again */
178 /* from within plan_a(), of all places */
179 }
180
181 /* True if the remainder of the patch file contains a diff of some sort. */
182
183 bool
184 there_is_another_patch(void)
185 {
186 bool exists = false;
187
188 if (p_base != 0L && p_base >= p_filesize) {
189 if (verbose)
190 say("done\n");
191 return false;
192 }
193 if (verbose)
194 say("Hmm...");
195 diff_type = intuit_diff_type();
196 if (!diff_type) {
197 if (p_base != 0L) {
198 if (verbose)
199 say(" Ignoring the trailing garbage.\ndone\n");
200 } else
201 say(" I can't seem to find a patch in there anywhere.\n");
202 return false;
203 }
204 if (verbose)
205 say(" %sooks like %s to me...\n",
206 (p_base == 0L ? "L" : "The next patch l"),
207 diff_type == UNI_DIFF ? "a unified diff" :
208 diff_type == CONTEXT_DIFF ? "a context diff" :
209 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" :
210 diff_type == NORMAL_DIFF ? "a normal diff" :
211 "an ed script");
212 if (p_indent && verbose)
213 say("(Patch is indented %d space%s.)\n", p_indent,
214 p_indent == 1 ? "" : "s");
215 skip_to(p_start, p_sline);
216 while (filearg[0] == NULL) {
217 if (force || batch) {
218 say("No file to patch. Skipping...\n");
219 filearg[0] = savestr(bestguess);
220 skip_rest_of_patch = true;
221 return true;
222 }
223 ask("File to patch: ");
224 if (*buf != '\n') {
225 free(bestguess);
226 bestguess = savestr(buf);
227 filearg[0] = fetchname(buf, &exists, 0);
228 }
229 if (!exists) {
230 ask("No file found--skip this patch? [n] ");
231 if (*buf != 'y')
232 continue;
233 if (verbose)
234 say("Skipping patch...\n");
235 free(filearg[0]);
236 filearg[0] = fetchname(bestguess, &exists, 0);
237 skip_rest_of_patch = true;
238 return true;
239 }
240 }
241 return true;
242 }
243
244 /* Determine what kind of diff is in the remaining part of the patch file. */
245
246 static int
247 intuit_diff_type(void)
248 {
249 long this_line = 0, previous_line;
250 long first_command_line = -1;
251 LINENUM fcl_line = -1;
252 bool last_line_was_command = false, this_is_a_command = false;
253 bool stars_last_line = false, stars_this_line = false;
254 char *s, *t;
255 int indent, retval;
256 struct file_name names[MAX_FILE];
257
258 memset(names, 0, sizeof(names));
259 ok_to_create_file = false;
260 fseek(pfp, p_base, SEEK_SET);
261 p_input_line = p_bline - 1;
262 for (;;) {
263 previous_line = this_line;
264 last_line_was_command = this_is_a_command;
265 stars_last_line = stars_this_line;
266 this_line = ftell(pfp);
267 indent = 0;
268 p_input_line++;
269 if (fgets(buf, buf_len, pfp) == NULL) {
270 if (first_command_line >= 0L) {
271 /* nothing but deletes!? */
272 p_start = first_command_line;
273 p_sline = fcl_line;
274 retval = ED_DIFF;
275 goto scan_exit;
276 } else {
277 p_start = this_line;
278 p_sline = p_input_line;
279 retval = 0;
280 goto scan_exit;
281 }
282 }
283 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) {
284 if (*s == '\t')
285 indent += 8 - (indent % 8);
286 else
287 indent++;
288 }
289 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++)
290 ;
291 this_is_a_command = (isdigit((unsigned char)*s) &&
292 (*t == 'd' || *t == 'c' || *t == 'a'));
293 if (first_command_line < 0L && this_is_a_command) {
294 first_command_line = this_line;
295 fcl_line = p_input_line;
296 p_indent = indent; /* assume this for now */
297 }
298 if (!stars_last_line && strnEQ(s, "*** ", 4))
299 names[OLD_FILE].path = fetchname(s + 4,
300 &names[OLD_FILE].exists, strippath);
301 else if (strnEQ(s, "--- ", 4))
302 names[NEW_FILE].path = fetchname(s + 4,
303 &names[NEW_FILE].exists, strippath);
304 else if (strnEQ(s, "+++ ", 4))
305 /* pretend it is the old name */
306 names[OLD_FILE].path = fetchname(s + 4,
307 &names[OLD_FILE].exists, strippath);
308 else if (strnEQ(s, "Index:", 6))
309 names[INDEX_FILE].path = fetchname(s + 6,
310 &names[INDEX_FILE].exists, strippath);
311 else if (strnEQ(s, "Prereq:", 7)) {
312 for (t = s + 7; isspace((unsigned char)*t); t++)
313 ;
314 revision = savestr(t);
315 for (t = revision; *t && !isspace((unsigned char)*t); t++)
316 ;
317 *t = '\0';
318 if (*revision == '\0') {
319 free(revision);
320 revision = NULL;
321 }
322 }
323 if ((!diff_type || diff_type == ED_DIFF) &&
324 first_command_line >= 0L &&
325 strEQ(s, ".\n")) {
326 p_indent = indent;
327 p_start = first_command_line;
328 p_sline = fcl_line;
329 retval = ED_DIFF;
330 goto scan_exit;
331 }
332 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) {
333 if (strnEQ(s + 4, "0,0", 3))
334 ok_to_create_file = true;
335 p_indent = indent;
336 p_start = this_line;
337 p_sline = p_input_line;
338 retval = UNI_DIFF;
339 goto scan_exit;
340 }
341 stars_this_line = strnEQ(s, "********", 8);
342 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line &&
343 strnEQ(s, "*** ", 4)) {
344 if (atol(s + 4) == 0)
345 ok_to_create_file = true;
346 /*
347 * If this is a new context diff the character just
348 * before the newline is a '*'.
349 */
350 while (*s != '\n')
351 s++;
352 p_indent = indent;
353 p_start = previous_line;
354 p_sline = p_input_line - 1;
355 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF);
356 goto scan_exit;
357 }
358 if ((!diff_type || diff_type == NORMAL_DIFF) &&
359 last_line_was_command &&
360 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) {
361 p_start = previous_line;
362 p_sline = p_input_line - 1;
363 p_indent = indent;
364 retval = NORMAL_DIFF;
365 goto scan_exit;
366 }
367 }
368 scan_exit:
369 if (retval == UNI_DIFF) {
370 /* unswap old and new */
371 struct file_name tmp = names[OLD_FILE];
372 names[OLD_FILE] = names[NEW_FILE];
373 names[NEW_FILE] = tmp;
374 }
375 if (filearg[0] == NULL) {
376 if (posix)
377 filearg[0] = posix_name(names, ok_to_create_file);
378 else {
379 /* Ignore the Index: name for context diffs, like GNU */
380 if (names[OLD_FILE].path != NULL ||
381 names[NEW_FILE].path != NULL) {
382 free(names[INDEX_FILE].path);
383 names[INDEX_FILE].path = NULL;
384 }
385 filearg[0] = best_name(names, ok_to_create_file);
386 }
387 }
388
389 free(bestguess);
390 bestguess = NULL;
391 if (filearg[0] != NULL)
392 bestguess = savestr(filearg[0]);
393 else if (!ok_to_create_file) {
394 /*
395 * We don't want to create a new file but we need a
396 * filename to set bestguess. Avoid setting filearg[0]
397 * so the file is not created automatically.
398 */
399 if (posix)
400 bestguess = posix_name(names, true);
401 else
402 bestguess = best_name(names, true);
403 }
404 free(names[OLD_FILE].path);
405 free(names[NEW_FILE].path);
406 free(names[INDEX_FILE].path);
407 return retval;
408 }
409
410 /*
411 * Remember where this patch ends so we know where to start up again.
412 */
413 static void
414 next_intuit_at(LINENUM file_pos, LINENUM file_line)
415 {
416 p_base = file_pos;
417 p_bline = file_line;
418 }
419
420 /*
421 * Basically a verbose fseek() to the actual diff listing.
422 */
423 static void
424 skip_to(LINENUM file_pos, LINENUM file_line)
425 {
426 char *ret;
427
428 if (p_base > file_pos)
429 fatal("Internal error: seek %ld>%ld\n", p_base, file_pos);
430 if (verbose && p_base < file_pos) {
431 fseek(pfp, p_base, SEEK_SET);
432 say("The text leading up to this was:\n--------------------------\n");
433 while (ftell(pfp) < file_pos) {
434 ret = fgets(buf, buf_len, pfp);
435 if (ret == NULL)
436 fatal("Unexpected end of file\n");
437 say("|%s", buf);
438 }
439 say("--------------------------\n");
440 } else
441 fseek(pfp, file_pos, SEEK_SET);
442 p_input_line = file_line - 1;
443 }
444
445 /* Make this a function for better debugging. */
446 static void
447 malformed(void)
448 {
449 fatal("malformed patch at line %ld: %s", p_input_line, buf);
450 /* about as informative as "Syntax error" in C */
451 }
452
453 /*
454 * True if the line has been discarded (i.e. it is a line saying
455 * "\ No newline at end of file".)
456 */
457 static bool
458 remove_special_line(void)
459 {
460 int c;
461
462 c = fgetc(pfp);
463 if (c == '\\') {
464 do {
465 c = fgetc(pfp);
466 } while (c != EOF && c != '\n');
467
468 return true;
469 }
470 if (c != EOF)
471 fseek(pfp, -1L, SEEK_CUR);
472
473 return false;
474 }
475
476 /*
477 * True if there is more of the current diff listing to process.
478 */
479 bool
480 another_hunk(void)
481 {
482 long line_beginning; /* file pos of the current line */
483 LINENUM repl_beginning; /* index of --- line */
484 LINENUM fillcnt; /* #lines of missing ptrn or repl */
485 LINENUM fillsrc; /* index of first line to copy */
486 LINENUM filldst; /* index of first missing line */
487 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */
488 bool repl_could_be_missing; /* no + or ! lines in this hunk */
489 bool repl_missing; /* we are now backtracking */
490 long repl_backtrack_position; /* file pos of first repl line */
491 LINENUM repl_patch_line; /* input line number for same */
492 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */
493 char *s, *ret;
494 int context = 0;
495
496 while (p_end >= 0) {
497 if (p_end == p_efake)
498 p_end = p_bfake; /* don't free twice */
499 else
500 free(p_line[p_end]);
501 p_end--;
502 }
503 p_efake = -1;
504
505 p_max = hunkmax; /* gets reduced when --- found */
506 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) {
507 line_beginning = ftell(pfp);
508 repl_beginning = 0;
509 fillcnt = 0;
510 fillsrc = 0;
511 filldst = 0;
512 ptrn_spaces_eaten = false;
513 repl_could_be_missing = true;
514 repl_missing = false;
515 repl_backtrack_position = 0;
516 repl_patch_line = 0;
517 ptrn_copiable = 0;
518
519 ret = pgets(buf, buf_len, pfp);
520 p_input_line++;
521 if (ret == NULL || strnNE(buf, "********", 8)) {
522 next_intuit_at(line_beginning, p_input_line);
523 return false;
524 }
525 p_context = 100;
526 p_hunk_beg = p_input_line + 1;
527 while (p_end < p_max) {
528 line_beginning = ftell(pfp);
529 ret = pgets(buf, buf_len, pfp);
530 p_input_line++;
531 if (ret == NULL) {
532 if (p_max - p_end < 4) {
533 /* assume blank lines got chopped */
534 strlcpy(buf, " \n", buf_len);
535 } else {
536 if (repl_beginning && repl_could_be_missing) {
537 repl_missing = true;
538 goto hunk_done;
539 }
540 fatal("unexpected end of file in patch\n");
541 }
542 }
543 p_end++;
544 if (p_end >= hunkmax)
545 fatal("Internal error: hunk larger than hunk "
546 "buffer size");
547 p_char[p_end] = *buf;
548 p_line[p_end] = NULL;
549 switch (*buf) {
550 case '*':
551 if (strnEQ(buf, "********", 8)) {
552 if (repl_beginning && repl_could_be_missing) {
553 repl_missing = true;
554 goto hunk_done;
555 } else
556 fatal("unexpected end of hunk "
557 "at line %ld\n",
558 p_input_line);
559 }
560 if (p_end != 0) {
561 if (repl_beginning && repl_could_be_missing) {
562 repl_missing = true;
563 goto hunk_done;
564 }
565 fatal("unexpected *** at line %ld: %s",
566 p_input_line, buf);
567 }
568 context = 0;
569 p_line[p_end] = savestr(buf);
570 if (out_of_mem) {
571 p_end--;
572 return false;
573 }
574 for (s = buf; *s && !isdigit((unsigned char)*s); s++)
575 ;
576 if (!*s)
577 malformed();
578 if (strnEQ(s, "0,0", 3))
579 memmove(s, s + 2, strlen(s + 2) + 1);
580 p_first = (LINENUM) atol(s);
581 while (isdigit((unsigned char)*s))
582 s++;
583 if (*s == ',') {
584 for (; *s && !isdigit((unsigned char)*s); s++)
585 ;
586 if (!*s)
587 malformed();
588 p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1;
589 } else if (p_first)
590 p_ptrn_lines = 1;
591 else {
592 p_ptrn_lines = 0;
593 p_first = 1;
594 }
595
596 /* we need this much at least */
597 p_max = p_ptrn_lines + 6;
598 while (p_max >= hunkmax)
599 grow_hunkmax();
600 p_max = hunkmax;
601 break;
602 case '-':
603 if (buf[1] == '-') {
604 if (repl_beginning ||
605 (p_end != p_ptrn_lines + 1 +
606 (p_char[p_end - 1] == '\n'))) {
607 if (p_end == 1) {
608 /*
609 * `old' lines were omitted;
610 * set up to fill them in
611 * from 'new' context lines.
612 */
613 p_end = p_ptrn_lines + 1;
614 fillsrc = p_end + 1;
615 filldst = 1;
616 fillcnt = p_ptrn_lines;
617 } else {
618 if (repl_beginning) {
619 if (repl_could_be_missing) {
620 repl_missing = true;
621 goto hunk_done;
622 }
623 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n",
624 p_input_line, p_hunk_beg + repl_beginning);
625 } else {
626 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n",
627 (p_end <= p_ptrn_lines
628 ? "Premature"
629 : "Overdue"),
630 p_input_line, p_hunk_beg);
631 }
632 }
633 }
634 repl_beginning = p_end;
635 repl_backtrack_position = ftell(pfp);
636 repl_patch_line = p_input_line;
637 p_line[p_end] = savestr(buf);
638 if (out_of_mem) {
639 p_end--;
640 return false;
641 }
642 p_char[p_end] = '=';
643 for (s = buf; *s && !isdigit((unsigned char)*s); s++)
644 ;
645 if (!*s)
646 malformed();
647 p_newfirst = (LINENUM) atol(s);
648 while (isdigit((unsigned char)*s))
649 s++;
650 if (*s == ',') {
651 for (; *s && !isdigit((unsigned char)*s); s++)
652 ;
653 if (!*s)
654 malformed();
655 p_repl_lines = ((LINENUM) atol(s)) -
656 p_newfirst + 1;
657 } else if (p_newfirst)
658 p_repl_lines = 1;
659 else {
660 p_repl_lines = 0;
661 p_newfirst = 1;
662 }
663 p_max = p_repl_lines + p_end;
664 if (p_max > MAXHUNKSIZE)
665 fatal("hunk too large (%ld lines) at line %ld: %s",
666 p_max, p_input_line, buf);
667 while (p_max >= hunkmax)
668 grow_hunkmax();
669 if (p_repl_lines != ptrn_copiable &&
670 (p_context != 0 || p_repl_lines != 1))
671 repl_could_be_missing = false;
672 break;
673 }
674 goto change_line;
675 case '+':
676 case '!':
677 repl_could_be_missing = false;
678 change_line:
679 if (buf[1] == '\n' && canonicalize)
680 strlcpy(buf + 1, " \n", buf_len - 1);
681 if (!isspace((unsigned char)buf[1]) && buf[1] != '>' &&
682 buf[1] != '<' &&
683 repl_beginning && repl_could_be_missing) {
684 repl_missing = true;
685 goto hunk_done;
686 }
687 if (context >= 0) {
688 if (context < p_context)
689 p_context = context;
690 context = -1000;
691 }
692 p_line[p_end] = savestr(buf + 2);
693 if (out_of_mem) {
694 p_end--;
695 return false;
696 }
697 if (p_end == p_ptrn_lines) {
698 if (remove_special_line()) {
699 int len;
700
701 len = strlen(p_line[p_end]) - 1;
702 (p_line[p_end])[len] = 0;
703 }
704 }
705 break;
706 case '\t':
707 case '\n': /* assume the 2 spaces got eaten */
708 if (repl_beginning && repl_could_be_missing &&
709 (!ptrn_spaces_eaten ||
710 diff_type == NEW_CONTEXT_DIFF)) {
711 repl_missing = true;
712 goto hunk_done;
713 }
714 p_line[p_end] = savestr(buf);
715 if (out_of_mem) {
716 p_end--;
717 return false;
718 }
719 if (p_end != p_ptrn_lines + 1) {
720 ptrn_spaces_eaten |= (repl_beginning != 0);
721 context++;
722 if (!repl_beginning)
723 ptrn_copiable++;
724 p_char[p_end] = ' ';
725 }
726 break;
727 case ' ':
728 if (!isspace((unsigned char)buf[1]) &&
729 repl_beginning && repl_could_be_missing) {
730 repl_missing = true;
731 goto hunk_done;
732 }
733 context++;
734 if (!repl_beginning)
735 ptrn_copiable++;
736 p_line[p_end] = savestr(buf + 2);
737 if (out_of_mem) {
738 p_end--;
739 return false;
740 }
741 break;
742 default:
743 if (repl_beginning && repl_could_be_missing) {
744 repl_missing = true;
745 goto hunk_done;
746 }
747 malformed();
748 }
749 /* set up p_len for strncmp() so we don't have to */
750 /* assume null termination */
751 if (p_line[p_end])
752 p_len[p_end] = strlen(p_line[p_end]);
753 else
754 p_len[p_end] = 0;
755 }
756
757 hunk_done:
758 if (p_end >= 0 && !repl_beginning)
759 fatal("no --- found in patch at line %ld\n", pch_hunk_beg());
760
761 if (repl_missing) {
762
763 /* reset state back to just after --- */
764 p_input_line = repl_patch_line;
765 for (p_end--; p_end > repl_beginning; p_end--)
766 free(p_line[p_end]);
767 fseek(pfp, repl_backtrack_position, SEEK_SET);
768
769 /* redundant 'new' context lines were omitted - set */
770 /* up to fill them in from the old file context */
771 if (!p_context && p_repl_lines == 1) {
772 p_repl_lines = 0;
773 p_max--;
774 }
775 fillsrc = 1;
776 filldst = repl_beginning + 1;
777 fillcnt = p_repl_lines;
778 p_end = p_max;
779 } else if (!p_context && fillcnt == 1) {
780 /* the first hunk was a null hunk with no context */
781 /* and we were expecting one line -- fix it up. */
782 while (filldst < p_end) {
783 p_line[filldst] = p_line[filldst + 1];
784 p_char[filldst] = p_char[filldst + 1];
785 p_len[filldst] = p_len[filldst + 1];
786 filldst++;
787 }
788 #if 0
789 repl_beginning--; /* this doesn't need to be fixed */
790 #endif
791 p_end--;
792 p_first++; /* do append rather than insert */
793 fillcnt = 0;
794 p_ptrn_lines = 0;
795 }
796 if (diff_type == CONTEXT_DIFF &&
797 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) {
798 if (verbose)
799 say("%s\n%s\n%s\n",
800 "(Fascinating--this is really a new-style context diff but without",
801 "the telltale extra asterisks on the *** line that usually indicate",
802 "the new style...)");
803 diff_type = NEW_CONTEXT_DIFF;
804 }
805 /* if there were omitted context lines, fill them in now */
806 if (fillcnt) {
807 p_bfake = filldst; /* remember where not to free() */
808 p_efake = filldst + fillcnt - 1;
809 while (fillcnt-- > 0) {
810 while (fillsrc <= p_end && p_char[fillsrc] != ' ')
811 fillsrc++;
812 if (fillsrc > p_end)
813 fatal("replacement text or line numbers mangled in hunk at line %ld\n",
814 p_hunk_beg);
815 p_line[filldst] = p_line[fillsrc];
816 p_char[filldst] = p_char[fillsrc];
817 p_len[filldst] = p_len[fillsrc];
818 fillsrc++;
819 filldst++;
820 }
821 while (fillsrc <= p_end && fillsrc != repl_beginning &&
822 p_char[fillsrc] != ' ')
823 fillsrc++;
824 #ifdef DEBUGGING
825 if (debug & 64)
826 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n",
827 fillsrc, filldst, repl_beginning, p_end + 1);
828 #endif
829 if (fillsrc != p_end + 1 && fillsrc != repl_beginning)
830 malformed();
831 if (filldst != p_end + 1 && filldst != repl_beginning)
832 malformed();
833 }
834 if (p_line[p_end] != NULL) {
835 if (remove_special_line()) {
836 p_len[p_end] -= 1;
837 (p_line[p_end])[p_len[p_end]] = 0;
838 }
839 }
840 } else if (diff_type == UNI_DIFF) {
841 LINENUM fillold; /* index of old lines */
842 LINENUM fillnew; /* index of new lines */
843 char ch;
844
845 line_beginning = ftell(pfp); /* file pos of the current line */
846 ret = pgets(buf, buf_len, pfp);
847 p_input_line++;
848 if (ret == NULL || strnNE(buf, "@@ -", 4)) {
849 next_intuit_at(line_beginning, p_input_line);
850 return false;
851 }
852 s = buf + 4;
853 if (!*s)
854 malformed();
855 p_first = (LINENUM) atol(s);
856 while (isdigit((unsigned char)*s))
857 s++;
858 if (*s == ',') {
859 p_ptrn_lines = (LINENUM) atol(++s);
860 while (isdigit((unsigned char)*s))
861 s++;
862 } else
863 p_ptrn_lines = 1;
864 if (*s == ' ')
865 s++;
866 if (*s != '+' || !*++s)
867 malformed();
868 p_newfirst = (LINENUM) atol(s);
869 while (isdigit((unsigned char)*s))
870 s++;
871 if (*s == ',') {
872 p_repl_lines = (LINENUM) atol(++s);
873 while (isdigit((unsigned char)*s))
874 s++;
875 } else
876 p_repl_lines = 1;
877 if (*s == ' ')
878 s++;
879 if (*s != '@')
880 malformed();
881 if (!p_ptrn_lines)
882 p_first++; /* do append rather than insert */
883 p_max = p_ptrn_lines + p_repl_lines + 1;
884 while (p_max >= hunkmax)
885 grow_hunkmax();
886 fillold = 1;
887 fillnew = fillold + p_ptrn_lines;
888 p_end = fillnew + p_repl_lines;
889 snprintf(buf, buf_len, "*** %ld,%ld ****\n", p_first,
890 p_first + p_ptrn_lines - 1);
891 p_line[0] = savestr(buf);
892 if (out_of_mem) {
893 p_end = -1;
894 return false;
895 }
896 p_char[0] = '*';
897 snprintf(buf, buf_len, "--- %ld,%ld ----\n", p_newfirst,
898 p_newfirst + p_repl_lines - 1);
899 p_line[fillnew] = savestr(buf);
900 if (out_of_mem) {
901 p_end = 0;
902 return false;
903 }
904 p_char[fillnew++] = '=';
905 p_context = 100;
906 context = 0;
907 p_hunk_beg = p_input_line + 1;
908 while (fillold <= p_ptrn_lines || fillnew <= p_end) {
909 line_beginning = ftell(pfp);
910 ret = pgets(buf, buf_len, pfp);
911 p_input_line++;
912 if (ret == NULL) {
913 if (p_max - fillnew < 3) {
914 /* assume blank lines got chopped */
915 strlcpy(buf, " \n", buf_len);
916 } else {
917 fatal("unexpected end of file in patch\n");
918 }
919 }
920 if (*buf == '\t' || *buf == '\n') {
921 ch = ' '; /* assume the space got eaten */
922 s = savestr(buf);
923 } else {
924 ch = *buf;
925 s = savestr(buf + 1);
926 }
927 if (out_of_mem) {
928 while (--fillnew > p_ptrn_lines)
929 free(p_line[fillnew]);
930 p_end = fillold - 1;
931 return false;
932 }
933 switch (ch) {
934 case '-':
935 if (fillold > p_ptrn_lines) {
936 free(s);
937 p_end = fillnew - 1;
938 malformed();
939 }
940 p_char[fillold] = ch;
941 p_line[fillold] = s;
942 p_len[fillold++] = strlen(s);
943 if (fillold > p_ptrn_lines) {
944 if (remove_special_line()) {
945 p_len[fillold - 1] -= 1;
946 s[p_len[fillold - 1]] = 0;
947 }
948 }
949 break;
950 case '=':
951 ch = ' ';
952 /* FALL THROUGH */
953 case ' ':
954 if (fillold > p_ptrn_lines) {
955 free(s);
956 while (--fillnew > p_ptrn_lines)
957 free(p_line[fillnew]);
958 p_end = fillold - 1;
959 malformed();
960 }
961 context++;
962 p_char[fillold] = ch;
963 p_line[fillold] = s;
964 p_len[fillold++] = strlen(s);
965 s = savestr(s);
966 if (out_of_mem) {
967 while (--fillnew > p_ptrn_lines)
968 free(p_line[fillnew]);
969 p_end = fillold - 1;
970 return false;
971 }
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 /* FALL THROUGH */
979 case '+':
980 if (fillnew > p_end) {
981 free(s);
982 while (--fillnew > p_ptrn_lines)
983 free(p_line[fillnew]);
984 p_end = fillold - 1;
985 malformed();
986 }
987 p_char[fillnew] = ch;
988 p_line[fillnew] = s;
989 p_len[fillnew++] = strlen(s);
990 if (fillold > p_ptrn_lines) {
991 if (remove_special_line()) {
992 p_len[fillnew - 1] -= 1;
993 s[p_len[fillnew - 1]] = 0;
994 }
995 }
996 break;
997 default:
998 p_end = fillnew;
999 malformed();
1000 }
1001 if (ch != ' ' && context > 0) {
1002 if (context < p_context)
1003 p_context = context;
1004 context = -1000;
1005 }
1006 } /* while */
1007 } else { /* normal diff--fake it up */
1008 char hunk_type;
1009 int i;
1010 LINENUM min, max;
1011
1012 line_beginning = ftell(pfp);
1013 p_context = 0;
1014 ret = pgets(buf, buf_len, pfp);
1015 p_input_line++;
1016 if (ret == NULL || !isdigit((unsigned char)*buf)) {
1017 next_intuit_at(line_beginning, p_input_line);
1018 return false;
1019 }
1020 p_first = (LINENUM) atol(buf);
1021 for (s = buf; isdigit((unsigned char)*s); s++)
1022 ;
1023 if (*s == ',') {
1024 p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1;
1025 while (isdigit((unsigned char)*s))
1026 s++;
1027 } else
1028 p_ptrn_lines = (*s != 'a');
1029 hunk_type = *s;
1030 if (hunk_type == 'a')
1031 p_first++; /* do append rather than insert */
1032 min = (LINENUM) atol(++s);
1033 for (; isdigit((unsigned char)*s); s++)
1034 ;
1035 if (*s == ',')
1036 max = (LINENUM) atol(++s);
1037 else
1038 max = min;
1039 if (hunk_type == 'd')
1040 min++;
1041 p_end = p_ptrn_lines + 1 + max - min + 1;
1042 if (p_end > MAXHUNKSIZE)
1043 fatal("hunk too large (%ld lines) at line %ld: %s",
1044 p_end, p_input_line, buf);
1045 while (p_end >= hunkmax)
1046 grow_hunkmax();
1047 p_newfirst = min;
1048 p_repl_lines = max - min + 1;
1049 snprintf(buf, buf_len, "*** %ld,%ld\n", p_first,
1050 p_first + p_ptrn_lines - 1);
1051 p_line[0] = savestr(buf);
1052 if (out_of_mem) {
1053 p_end = -1;
1054 return false;
1055 }
1056 p_char[0] = '*';
1057 for (i = 1; i <= p_ptrn_lines; i++) {
1058 ret = pgets(buf, buf_len, pfp);
1059 p_input_line++;
1060 if (ret == NULL)
1061 fatal("unexpected end of file in patch at line %ld\n",
1062 p_input_line);
1063 if (*buf != '<')
1064 fatal("< expected at line %ld of patch\n",
1065 p_input_line);
1066 p_line[i] = savestr(buf + 2);
1067 if (out_of_mem) {
1068 p_end = i - 1;
1069 return false;
1070 }
1071 p_len[i] = strlen(p_line[i]);
1072 p_char[i] = '-';
1073 }
1074
1075 if (remove_special_line()) {
1076 p_len[i - 1] -= 1;
1077 (p_line[i - 1])[p_len[i - 1]] = 0;
1078 }
1079 if (hunk_type == 'c') {
1080 ret = pgets(buf, buf_len, pfp);
1081 p_input_line++;
1082 if (ret == NULL)
1083 fatal("unexpected end of file in patch at line %ld\n",
1084 p_input_line);
1085 if (*buf != '-')
1086 fatal("--- expected at line %ld of patch\n",
1087 p_input_line);
1088 }
1089 snprintf(buf, buf_len, "--- %ld,%ld\n", min, max);
1090 p_line[i] = savestr(buf);
1091 if (out_of_mem) {
1092 p_end = i - 1;
1093 return false;
1094 }
1095 p_char[i] = '=';
1096 for (i++; i <= p_end; i++) {
1097 ret = pgets(buf, buf_len, pfp);
1098 p_input_line++;
1099 if (ret == NULL)
1100 fatal("unexpected end of file in patch at line %ld\n",
1101 p_input_line);
1102 if (*buf != '>')
1103 fatal("> expected at line %ld of patch\n",
1104 p_input_line);
1105 p_line[i] = savestr(buf + 2);
1106 if (out_of_mem) {
1107 p_end = i - 1;
1108 return false;
1109 }
1110 p_len[i] = strlen(p_line[i]);
1111 p_char[i] = '+';
1112 }
1113
1114 if (remove_special_line()) {
1115 p_len[i - 1] -= 1;
1116 (p_line[i - 1])[p_len[i - 1]] = 0;
1117 }
1118 }
1119 if (reverse) /* backwards patch? */
1120 if (!pch_swap())
1121 say("Not enough memory to swap next hunk!\n");
1122 #ifdef DEBUGGING
1123 if (debug & 2) {
1124 int i;
1125 char special;
1126
1127 for (i = 0; i <= p_end; i++) {
1128 if (i == p_ptrn_lines)
1129 special = '^';
1130 else
1131 special = ' ';
1132 fprintf(stderr, "%3d %c %c %s", i, p_char[i],
1133 special, p_line[i]);
1134 fflush(stderr);
1135 }
1136 }
1137 #endif
1138 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */
1139 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */
1140 return true;
1141 }
1142
1143 /*
1144 * Input a line from the patch file, worrying about indentation.
1145 */
1146 static char *
1147 pgets(char *bf, int sz, FILE *fp)
1148 {
1149 char *s, *ret = fgets(bf, sz, fp);
1150 int indent = 0;
1151
1152 if (p_indent && ret != NULL) {
1153 for (s = buf;
1154 indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X');
1155 s++) {
1156 if (*s == '\t')
1157 indent += 8 - (indent % 7);
1158 else
1159 indent++;
1160 }
1161 if (buf != s && strlcpy(buf, s, buf_len) >= buf_len)
1162 fatal("buffer too small in pgets()\n");
1163 }
1164 return ret;
1165 }
1166
1167 /*
1168 * Reverse the old and new portions of the current hunk.
1169 */
1170 bool
1171 pch_swap(void)
1172 {
1173 char **tp_line; /* the text of the hunk */
1174 short *tp_len; /* length of each line */
1175 char *tp_char; /* +, -, and ! */
1176 LINENUM i;
1177 LINENUM n;
1178 bool blankline = false;
1179 char *s;
1180
1181 i = p_first;
1182 p_first = p_newfirst;
1183 p_newfirst = i;
1184
1185 /* make a scratch copy */
1186
1187 tp_line = p_line;
1188 tp_len = p_len;
1189 tp_char = p_char;
1190 p_line = NULL; /* force set_hunkmax to allocate again */
1191 p_len = NULL;
1192 p_char = NULL;
1193 set_hunkmax();
1194 if (p_line == NULL || p_len == NULL || p_char == NULL) {
1195
1196 free(p_line);
1197 p_line = tp_line;
1198 free(p_len);
1199 p_len = tp_len;
1200 free(p_char);
1201 p_char = tp_char;
1202 return false; /* not enough memory to swap hunk! */
1203 }
1204 /* now turn the new into the old */
1205
1206 i = p_ptrn_lines + 1;
1207 if (tp_char[i] == '\n') { /* account for possible blank line */
1208 blankline = true;
1209 i++;
1210 }
1211 if (p_efake >= 0) { /* fix non-freeable ptr range */
1212 if (p_efake <= i)
1213 n = p_end - i + 1;
1214 else
1215 n = -i;
1216 p_efake += n;
1217 p_bfake += n;
1218 }
1219 for (n = 0; i <= p_end; i++, n++) {
1220 p_line[n] = tp_line[i];
1221 p_char[n] = tp_char[i];
1222 if (p_char[n] == '+')
1223 p_char[n] = '-';
1224 p_len[n] = tp_len[i];
1225 }
1226 if (blankline) {
1227 i = p_ptrn_lines + 1;
1228 p_line[n] = tp_line[i];
1229 p_char[n] = tp_char[i];
1230 p_len[n] = tp_len[i];
1231 n++;
1232 }
1233 if (p_char[0] != '=')
1234 fatal("Malformed patch at line %ld: expected '=' found '%c'\n",
1235 p_input_line, p_char[0]);
1236 p_char[0] = '*';
1237 for (s = p_line[0]; *s; s++)
1238 if (*s == '-')
1239 *s = '*';
1240
1241 /* now turn the old into the new */
1242
1243 if (p_char[0] != '*')
1244 fatal("Malformed patch at line %ld: expected '*' found '%c'\n",
1245 p_input_line, p_char[0]);
1246 tp_char[0] = '=';
1247 for (s = tp_line[0]; *s; s++)
1248 if (*s == '*')
1249 *s = '-';
1250 for (i = 0; n <= p_end; i++, n++) {
1251 p_line[n] = tp_line[i];
1252 p_char[n] = tp_char[i];
1253 if (p_char[n] == '-')
1254 p_char[n] = '+';
1255 p_len[n] = tp_len[i];
1256 }
1257
1258 if (i != p_ptrn_lines + 1)
1259 fatal("Malformed patch at line %ld: expected %ld lines, "
1260 "got %ld\n",
1261 p_input_line, p_ptrn_lines + 1, i);
1262
1263 i = p_ptrn_lines;
1264 p_ptrn_lines = p_repl_lines;
1265 p_repl_lines = i;
1266
1267 free(tp_line);
1268 free(tp_len);
1269 free(tp_char);
1270
1271 return true;
1272 }
1273
1274 /*
1275 * Return the specified line position in the old file of the old context.
1276 */
1277 LINENUM
1278 pch_first(void)
1279 {
1280 return p_first;
1281 }
1282
1283 /*
1284 * Return the number of lines of old context.
1285 */
1286 LINENUM
1287 pch_ptrn_lines(void)
1288 {
1289 return p_ptrn_lines;
1290 }
1291
1292 /*
1293 * Return the probable line position in the new file of the first line.
1294 */
1295 LINENUM
1296 pch_newfirst(void)
1297 {
1298 return p_newfirst;
1299 }
1300
1301 /*
1302 * Return the number of lines in the replacement text including context.
1303 */
1304 LINENUM
1305 pch_repl_lines(void)
1306 {
1307 return p_repl_lines;
1308 }
1309
1310 /*
1311 * Return the number of lines in the whole hunk.
1312 */
1313 LINENUM
1314 pch_end(void)
1315 {
1316 return p_end;
1317 }
1318
1319 /*
1320 * Return the number of context lines before the first changed line.
1321 */
1322 LINENUM
1323 pch_context(void)
1324 {
1325 return p_context;
1326 }
1327
1328 /*
1329 * Return the length of a particular patch line.
1330 */
1331 short
1332 pch_line_len(LINENUM line)
1333 {
1334 return p_len[line];
1335 }
1336
1337 /*
1338 * Return the control character (+, -, *, !, etc) for a patch line.
1339 */
1340 char
1341 pch_char(LINENUM line)
1342 {
1343 return p_char[line];
1344 }
1345
1346 /*
1347 * Return a pointer to a particular patch line.
1348 */
1349 char *
1350 pfetch(LINENUM line)
1351 {
1352 return p_line[line];
1353 }
1354
1355 /*
1356 * Return where in the patch file this hunk began, for error messages.
1357 */
1358 LINENUM
1359 pch_hunk_beg(void)
1360 {
1361 return p_hunk_beg;
1362 }
1363
1364 /*
1365 * Apply an ed script by feeding ed itself.
1366 */
1367 void
1368 do_ed_script(void)
1369 {
1370 char *t;
1371 long beginning_of_this_line;
1372 FILE *pipefp;
1373
1374 pipefp = NULL;
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 vkernel multiprocessor port