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 * $NetBSD: pch.c,v 1.28 2015/07/30 21:47:51 christos Exp $
5 */
6
7 /*
8 * patch - a program to apply diffs to original files
9 *
10 * Copyright 1986, Larry Wall
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following condition is met:
14 * 1. Redistributions of source code must retain the above copyright notice,
15 * this condition and the following disclaimer.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * -C option added in 1998, original code by Marc Espie, based on FreeBSD
30 * behaviour
31 */
32
33 #include <sys/cdefs.h>
34 __RCSID("$NetBSD: pch.c,v 1.28 2015/07/30 21:47:51 christos Exp $");
35
36 #include <sys/types.h>
37 #include <sys/stat.h>
38
39 #include <ctype.h>
40 #include <libgen.h>
41 #include <limits.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <unistd.h>
46
47 #include "common.h"
48 #include "util.h"
49 #include "pch.h"
50 #include "pathnames.h"
51
52 /* Patch (diff listing) abstract type. */
53
54 static long p_filesize; /* size of the patch file */
55 static LINENUM p_first; /* 1st line number */
56 static LINENUM p_newfirst; /* 1st line number of replacement */
57 static LINENUM p_ptrn_lines; /* # lines in pattern */
58 static LINENUM p_repl_lines; /* # lines in replacement text */
59 static LINENUM p_end = -1; /* last line in hunk */
60 static LINENUM p_max; /* max allowed value of p_end */
61 static LINENUM p_context = 3; /* # of context lines */
62 static LINENUM p_input_line = 0; /* current line # from patch file */
63 static char **p_line = NULL;/* the text of the hunk */
64 static short *p_len = NULL; /* length of each line */
65 static char *p_char = NULL; /* +, -, and ! */
66 static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */
67 static int p_indent; /* indent to patch */
68 static LINENUM p_base; /* where to intuit this time */
69 static LINENUM p_bline; /* line # of p_base */
70 static LINENUM p_start; /* where intuit found a patch */
71 static LINENUM p_sline; /* and the line number for it */
72 static LINENUM p_hunk_beg; /* line number of current hunk */
73 static LINENUM p_efake = -1; /* end of faked up lines--don't free */
74 static LINENUM p_bfake = -1; /* beg of faked up lines */
75 static FILE *pfp = NULL; /* patch file pointer */
76 static char *bestguess = NULL; /* guess at correct filename */
77
78 static void grow_hunkmax(void);
79 static int intuit_diff_type(void);
80 static void next_intuit_at(LINENUM, LINENUM);
81 static void skip_to(LINENUM, LINENUM);
82 static char *pgets(char *, int, FILE *);
83 static char *best_name(const struct file_name *, bool);
84 static char *posix_name(const struct file_name *, bool);
85 static size_t num_components(const char *);
86
87 /*
88 * Prepare to look for the next patch in the patch file.
89 */
90 void
re_patch(void)91 re_patch(void)
92 {
93 p_first = 0;
94 p_newfirst = 0;
95 p_ptrn_lines = 0;
96 p_repl_lines = 0;
97 p_end = (LINENUM) - 1;
98 p_max = 0;
99 p_indent = 0;
100 }
101
102 /*
103 * Open the patch file at the beginning of time.
104 */
105 void
open_patch_file(const char * filename)106 open_patch_file(const char *filename)
107 {
108 struct stat filestat;
109
110 if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) {
111 pfp = fopen(TMPPATNAME, "w");
112 if (pfp == NULL)
113 pfatal("can't create %s", TMPPATNAME);
114 while (fgets(buf, buf_len, stdin) != NULL)
115 fputs(buf, pfp);
116 if (ferror(pfp) || fclose(pfp))
117 pfatal("can't write %s", TMPPATNAME);
118 filename = TMPPATNAME;
119 }
120 pfp = fopen(filename, "r");
121 if (pfp == NULL)
122 pfatal("patch file %s not found", filename);
123 fstat(fileno(pfp), &filestat);
124 p_filesize = filestat.st_size;
125 next_intuit_at(0L, 1L); /* start at the beginning */
126 set_hunkmax();
127 }
128
129 /*
130 * Make sure our dynamically realloced tables are malloced to begin with.
131 */
132 void
set_hunkmax(void)133 set_hunkmax(void)
134 {
135 if (p_line == NULL)
136 p_line = calloc((size_t) hunkmax, sizeof(char *));
137 if (p_len == NULL)
138 p_len = calloc((size_t) hunkmax, sizeof(short));
139 if (p_char == NULL)
140 p_char = calloc((size_t) hunkmax, sizeof(char));
141 }
142
143 /*
144 * Enlarge the arrays containing the current hunk of patch.
145 */
146 static void
grow_hunkmax(void)147 grow_hunkmax(void)
148 {
149 int new_hunkmax;
150 char **new_p_line;
151 short *new_p_len;
152 char *new_p_char;
153
154 new_hunkmax = hunkmax * 2;
155
156 if (p_line == NULL || p_len == NULL || p_char == NULL)
157 fatal("Internal memory allocation error\n");
158
159 new_p_line = realloc(p_line, new_hunkmax * sizeof(char *));
160 if (new_p_line == NULL)
161 free(p_line);
162
163 new_p_len = realloc(p_len, new_hunkmax * sizeof(short));
164 if (new_p_len == NULL)
165 free(p_len);
166
167 new_p_char = realloc(p_char, new_hunkmax * sizeof(char));
168 if (new_p_char == NULL)
169 free(p_char);
170
171 p_char = new_p_char;
172 p_len = new_p_len;
173 p_line = new_p_line;
174
175 if (p_line != NULL && p_len != NULL && p_char != NULL) {
176 hunkmax = new_hunkmax;
177 return;
178 }
179
180 if (!using_plan_a)
181 fatal("out of memory\n");
182 out_of_mem = true; /* whatever is null will be allocated again */
183 /* from within plan_a(), of all places */
184 }
185
186 /* True if the remainder of the patch file contains a diff of some sort. */
187
188 bool
there_is_another_patch(void)189 there_is_another_patch(void)
190 {
191 bool exists = false;
192
193 if (p_base != 0L && p_base >= p_filesize) {
194 if (verbose)
195 say("done\n");
196 return false;
197 }
198 if (verbose)
199 say("Hmm...");
200 diff_type = intuit_diff_type();
201 if (!diff_type) {
202 if (p_base != 0L) {
203 if (verbose)
204 say(" Ignoring the trailing garbage.\ndone\n");
205 } else
206 say(" I can't seem to find a patch in there anywhere.\n");
207 return false;
208 }
209 if (verbose)
210 say(" %sooks like %s to me...\n",
211 (p_base == 0L ? "L" : "The next patch l"),
212 diff_type == UNI_DIFF ? "a unified diff" :
213 diff_type == CONTEXT_DIFF ? "a context diff" :
214 diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" :
215 diff_type == NORMAL_DIFF ? "a normal diff" :
216 "an ed script");
217 if (p_indent && verbose)
218 say("(Patch is indented %d space%s.)\n", p_indent,
219 p_indent == 1 ? "" : "s");
220 skip_to(p_start, p_sline);
221 while (filearg[0] == NULL) {
222 if (force || batch) {
223 say("No file to patch. Skipping...\n");
224 filearg[0] = savestr(bestguess);
225 skip_rest_of_patch = true;
226 return true;
227 }
228 ask("File to patch: ");
229 if (*buf != '\n') {
230 free(bestguess);
231 bestguess = savestr(buf);
232 filearg[0] = fetchname(buf, &exists, 0);
233 }
234 if (!exists) {
235 ask("No file found--skip this patch? [n] ");
236 if (*buf != 'y')
237 continue;
238 if (verbose)
239 say("Skipping patch...\n");
240 free(filearg[0]);
241 filearg[0] = fetchname(bestguess, &exists, 0);
242 skip_rest_of_patch = true;
243 return true;
244 }
245 }
246 return true;
247 }
248
249 /* Determine what kind of diff is in the remaining part of the patch file. */
250
251 static int
intuit_diff_type(void)252 intuit_diff_type(void)
253 {
254 long this_line = 0, previous_line;
255 long first_command_line = -1;
256 LINENUM fcl_line = -1;
257 bool last_line_was_command = false, this_is_a_command = false;
258 bool stars_last_line = false, stars_this_line = false;
259 char *s, *t;
260 int indent, retval;
261 struct file_name names[MAX_FILE];
262
263 memset(names, 0, sizeof(names));
264 ok_to_create_file = false;
265 fseek(pfp, p_base, SEEK_SET);
266 p_input_line = p_bline - 1;
267 for (;;) {
268 previous_line = this_line;
269 last_line_was_command = this_is_a_command;
270 stars_last_line = stars_this_line;
271 this_line = ftell(pfp);
272 indent = 0;
273 p_input_line++;
274 if (fgets(buf, buf_len, pfp) == NULL) {
275 if (first_command_line >= 0L) {
276 /* nothing but deletes!? */
277 p_start = first_command_line;
278 p_sline = fcl_line;
279 retval = ED_DIFF;
280 goto scan_exit;
281 } else {
282 p_start = this_line;
283 p_sline = p_input_line;
284 retval = 0;
285 goto scan_exit;
286 }
287 }
288 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) {
289 if (*s == '\t')
290 indent += 8 - (indent % 8);
291 else
292 indent++;
293 }
294 for (t = s; isdigit((unsigned char)*t) || *t == ','; t++)
295 ;
296 this_is_a_command = (isdigit((unsigned char)*s) &&
297 (*t == 'd' || *t == 'c' || *t == 'a'));
298 if (first_command_line < 0L && this_is_a_command) {
299 first_command_line = this_line;
300 fcl_line = p_input_line;
301 p_indent = indent; /* assume this for now */
302 }
303 if (!stars_last_line && strnEQ(s, "*** ", 4))
304 names[OLD_FILE].path = fetchname(s + 4,
305 &names[OLD_FILE].exists, strippath);
306 else if (strnEQ(s, "--- ", 4))
307 names[NEW_FILE].path = fetchname(s + 4,
308 &names[NEW_FILE].exists, strippath);
309 else if (strnEQ(s, "+++ ", 4))
310 /* pretend it is the old name */
311 names[OLD_FILE].path = fetchname(s + 4,
312 &names[OLD_FILE].exists, strippath);
313 else if (strnEQ(s, "Index:", 6))
314 names[INDEX_FILE].path = fetchname(s + 6,
315 &names[INDEX_FILE].exists, strippath);
316 else if (strnEQ(s, "Prereq:", 7)) {
317 for (t = s + 7; isspace((unsigned char)*t); t++)
318 ;
319 revision = savestr(t);
320 for (t = revision; *t && !isspace((unsigned char)*t); t++)
321 ;
322 *t = '\0';
323 if (*revision == '\0') {
324 free(revision);
325 revision = NULL;
326 }
327 }
328 if ((!diff_type || diff_type == ED_DIFF) &&
329 first_command_line >= 0L &&
330 strEQ(s, ".\n")) {
331 p_indent = indent;
332 p_start = first_command_line;
333 p_sline = fcl_line;
334 retval = ED_DIFF;
335 goto scan_exit;
336 }
337 if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) {
338 if (strnEQ(s + 4, "0,0", 3))
339 ok_to_create_file = true;
340 p_indent = indent;
341 p_start = this_line;
342 p_sline = p_input_line;
343 retval = UNI_DIFF;
344 goto scan_exit;
345 }
346 stars_this_line = strnEQ(s, "********", 8);
347 if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line &&
348 strnEQ(s, "*** ", 4)) {
349 if (atol(s + 4) == 0)
350 ok_to_create_file = true;
351 /*
352 * If this is a new context diff the character just
353 * before the newline is a '*'.
354 */
355 while (*s != '\n')
356 s++;
357 p_indent = indent;
358 p_start = previous_line;
359 p_sline = p_input_line - 1;
360 retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF);
361 goto scan_exit;
362 }
363 if ((!diff_type || diff_type == NORMAL_DIFF) &&
364 last_line_was_command &&
365 (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) {
366 p_start = previous_line;
367 p_sline = p_input_line - 1;
368 p_indent = indent;
369 retval = NORMAL_DIFF;
370 goto scan_exit;
371 }
372 }
373 scan_exit:
374 if (retval == UNI_DIFF) {
375 /* unswap old and new */
376 struct file_name tmp = names[OLD_FILE];
377 names[OLD_FILE] = names[NEW_FILE];
378 names[NEW_FILE] = tmp;
379 }
380 if (filearg[0] == NULL) {
381 if (posix)
382 filearg[0] = posix_name(names, ok_to_create_file);
383 else {
384 /* Ignore the Index: name for context diffs, like GNU */
385 if (names[OLD_FILE].path != NULL ||
386 names[NEW_FILE].path != NULL) {
387 free(names[INDEX_FILE].path);
388 names[INDEX_FILE].path = NULL;
389 }
390 filearg[0] = best_name(names, ok_to_create_file);
391 }
392 }
393
394 free(bestguess);
395 bestguess = NULL;
396 if (filearg[0] != NULL)
397 bestguess = savestr(filearg[0]);
398 else if (!ok_to_create_file) {
399 /*
400 * We don't want to create a new file but we need a
401 * filename to set bestguess. Avoid setting filearg[0]
402 * so the file is not created automatically.
403 */
404 if (posix)
405 bestguess = posix_name(names, true);
406 else
407 bestguess = best_name(names, true);
408 }
409 free(names[OLD_FILE].path);
410 free(names[NEW_FILE].path);
411 free(names[INDEX_FILE].path);
412 return retval;
413 }
414
415 /*
416 * Remember where this patch ends so we know where to start up again.
417 */
418 static void
next_intuit_at(LINENUM file_pos,LINENUM file_line)419 next_intuit_at(LINENUM file_pos, LINENUM file_line)
420 {
421 p_base = file_pos;
422 p_bline = file_line;
423 }
424
425 /*
426 * Basically a verbose fseek() to the actual diff listing.
427 */
428 static void
skip_to(LINENUM file_pos,LINENUM file_line)429 skip_to(LINENUM file_pos, LINENUM file_line)
430 {
431 char *ret;
432
433 if (p_base > file_pos)
434 fatal("Internal error: seek %ld>%ld\n", p_base, file_pos);
435 if (verbose && p_base < file_pos) {
436 fseek(pfp, p_base, SEEK_SET);
437 say("The text leading up to this was:\n--------------------------\n");
438 while (ftell(pfp) < file_pos) {
439 ret = fgets(buf, buf_len, pfp);
440 if (ret == NULL)
441 fatal("Unexpected end of file\n");
442 say("|%s", buf);
443 }
444 say("--------------------------\n");
445 } else
446 fseek(pfp, file_pos, SEEK_SET);
447 p_input_line = file_line - 1;
448 }
449
450 /* Make this a function for better debugging. */
451 __dead static void
malformed(void)452 malformed(void)
453 {
454 fatal("malformed patch at line %ld: %s", p_input_line, buf);
455 /* about as informative as "Syntax error" in C */
456 }
457
458 static LINENUM
getlinenum(const char * s)459 getlinenum(const char *s)
460 {
461 LINENUM l = (LINENUM)atol(s);
462 if (l < 0) {
463 l = 0;
464 malformed();
465 }
466 return l;
467 }
468
469 static LINENUM
getskiplinenum(char ** p)470 getskiplinenum(char **p)
471 {
472 char *s = *p;
473 LINENUM l = getlinenum(s);
474 while (isdigit((unsigned char)*s))
475 s++;
476 *p = s;
477 return l;
478 }
479
480 /*
481 * True if the line has been discarded (i.e., it is a line saying
482 * "\ No newline at end of file".)
483 */
484 static bool
remove_special_line(void)485 remove_special_line(void)
486 {
487 int c;
488
489 c = fgetc(pfp);
490 if (c == '\\') {
491 do {
492 c = fgetc(pfp);
493 } while (c != EOF && c != '\n');
494
495 return true;
496 }
497 if (c != EOF)
498 fseek(pfp, -1L, SEEK_CUR);
499
500 return false;
501 }
502
503 /*
504 * True if there is more of the current diff listing to process.
505 */
506 bool
another_hunk(void)507 another_hunk(void)
508 {
509 long line_beginning; /* file pos of the current line */
510 LINENUM repl_beginning; /* index of --- line */
511 LINENUM fillcnt; /* #lines of missing ptrn or repl */
512 LINENUM fillsrc; /* index of first line to copy */
513 LINENUM filldst; /* index of first missing line */
514 bool ptrn_spaces_eaten; /* ptrn was slightly misformed */
515 bool repl_could_be_missing; /* no + or ! lines in this hunk */
516 bool repl_missing; /* we are now backtracking */
517 long repl_backtrack_position; /* file pos of first repl line */
518 LINENUM repl_patch_line; /* input line number for same */
519 LINENUM ptrn_copiable; /* # of copiable lines in ptrn */
520 char *s, *ret;
521 int context = 0;
522
523 while (p_end >= 0) {
524 if (p_end == p_efake)
525 p_end = p_bfake; /* don't free twice */
526 else
527 free(p_line[p_end]);
528 p_end--;
529 }
530 p_efake = -1;
531
532 p_max = hunkmax; /* gets reduced when --- found */
533 if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) {
534 line_beginning = ftell(pfp);
535 repl_beginning = 0;
536 fillcnt = 0;
537 fillsrc = 0;
538 filldst = 0;
539 ptrn_spaces_eaten = false;
540 repl_could_be_missing = true;
541 repl_missing = false;
542 repl_backtrack_position = 0;
543 repl_patch_line = 0;
544 ptrn_copiable = 0;
545
546 ret = pgets(buf, buf_len, pfp);
547 p_input_line++;
548 if (ret == NULL || strnNE(buf, "********", 8)) {
549 next_intuit_at(line_beginning, p_input_line);
550 return false;
551 }
552 p_context = 100;
553 p_hunk_beg = p_input_line + 1;
554 while (p_end < p_max) {
555 line_beginning = ftell(pfp);
556 ret = pgets(buf, buf_len, pfp);
557 p_input_line++;
558 if (ret == NULL) {
559 if (p_max - p_end < 4) {
560 /* assume blank lines got chopped */
561 strlcpy(buf, " \n", buf_len);
562 } else {
563 if (repl_beginning && repl_could_be_missing) {
564 repl_missing = true;
565 goto hunk_done;
566 }
567 fatal("unexpected end of file in patch\n");
568 }
569 }
570 p_end++;
571 if (p_end >= hunkmax)
572 fatal("Internal error: hunk larger than hunk "
573 "buffer size");
574 p_char[p_end] = *buf;
575 p_line[p_end] = NULL;
576 switch (*buf) {
577 case '*':
578 if (strnEQ(buf, "********", 8)) {
579 if (repl_beginning && repl_could_be_missing) {
580 repl_missing = true;
581 goto hunk_done;
582 } else
583 fatal("unexpected end of hunk "
584 "at line %ld\n",
585 p_input_line);
586 }
587 if (p_end != 0) {
588 if (repl_beginning && repl_could_be_missing) {
589 repl_missing = true;
590 goto hunk_done;
591 }
592 fatal("unexpected *** at line %ld: %s",
593 p_input_line, buf);
594 }
595 context = 0;
596 p_line[p_end] = savestr(buf);
597 if (out_of_mem) {
598 p_end--;
599 return false;
600 }
601 for (s = buf; *s && !isdigit((unsigned char)*s); s++)
602 ;
603 if (!*s)
604 malformed();
605 if (strnEQ(s, "0,0", 3))
606 memmove(s, s + 2, strlen(s + 2) + 1);
607 p_first = getskiplinenum(&s);
608 if (*s == ',') {
609 for (; *s && !isdigit((unsigned char)*s); s++)
610 ;
611 if (!*s)
612 malformed();
613 p_ptrn_lines = (getlinenum(s)) - p_first + 1;
614 if (p_ptrn_lines < 0)
615 malformed();
616 } else if (p_first)
617 p_ptrn_lines = 1;
618 else {
619 p_ptrn_lines = 0;
620 p_first = 1;
621 }
622 if (p_first >= LINENUM_MAX - p_ptrn_lines ||
623 p_ptrn_lines >= LINENUM_MAX - 6)
624 malformed();
625
626 /* we need this much at least */
627 p_max = p_ptrn_lines + 6;
628 while (p_max >= hunkmax)
629 grow_hunkmax();
630 p_max = hunkmax;
631 break;
632 case '-':
633 if (buf[1] == '-') {
634 if (repl_beginning ||
635 (p_end != p_ptrn_lines + 1 +
636 (p_char[p_end - 1] == '\n'))) {
637 if (p_end == 1) {
638 /*
639 * `old' lines were omitted;
640 * set up to fill them in
641 * from 'new' context lines.
642 */
643 p_end = p_ptrn_lines + 1;
644 fillsrc = p_end + 1;
645 filldst = 1;
646 fillcnt = p_ptrn_lines;
647 } else {
648 if (repl_beginning) {
649 if (repl_could_be_missing) {
650 repl_missing = true;
651 goto hunk_done;
652 }
653 fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n",
654 p_input_line, p_hunk_beg + repl_beginning);
655 } else {
656 fatal("%s \"---\" at line %ld--check line numbers at line %ld\n",
657 (p_end <= p_ptrn_lines
658 ? "Premature"
659 : "Overdue"),
660 p_input_line, p_hunk_beg);
661 }
662 }
663 }
664 repl_beginning = p_end;
665 repl_backtrack_position = ftell(pfp);
666 repl_patch_line = p_input_line;
667 p_line[p_end] = savestr(buf);
668 if (out_of_mem) {
669 p_end--;
670 return false;
671 }
672 p_char[p_end] = '=';
673 for (s = buf; *s && !isdigit((unsigned char)*s); s++)
674 ;
675 if (!*s)
676 malformed();
677 p_newfirst = getskiplinenum(&s);
678 if (*s == ',') {
679 for (; *s && !isdigit((unsigned char)*s); s++)
680 ;
681 if (!*s)
682 malformed();
683 p_repl_lines = (getlinenum(s)) -
684 p_newfirst + 1;
685 if (p_repl_lines < 0)
686 malformed();
687 } else if (p_newfirst)
688 p_repl_lines = 1;
689 else {
690 p_repl_lines = 0;
691 p_newfirst = 1;
692 }
693 if (p_newfirst >= LINENUM_MAX - p_repl_lines ||
694 p_repl_lines >= LINENUM_MAX - p_end)
695 malformed();
696 p_max = p_repl_lines + p_end;
697 if (p_max > MAXHUNKSIZE)
698 fatal("hunk too large (%ld lines) at line %ld: %s",
699 p_max, p_input_line, buf);
700 while (p_max >= hunkmax)
701 grow_hunkmax();
702 if (p_repl_lines != ptrn_copiable &&
703 (p_context != 0 || p_repl_lines != 1))
704 repl_could_be_missing = false;
705 break;
706 }
707 goto change_line;
708 case '+':
709 case '!':
710 repl_could_be_missing = false;
711 change_line:
712 if (buf[1] == '\n' && canonicalize)
713 strlcpy(buf + 1, " \n", buf_len - 1);
714 if (!isspace((unsigned char)buf[1]) && buf[1] != '>' &&
715 buf[1] != '<' &&
716 repl_beginning && repl_could_be_missing) {
717 repl_missing = true;
718 goto hunk_done;
719 }
720 if (context >= 0) {
721 if (context < p_context)
722 p_context = context;
723 context = -1000;
724 }
725 p_line[p_end] = savestr(buf + 2);
726 if (out_of_mem) {
727 p_end--;
728 return false;
729 }
730 if (p_end == p_ptrn_lines) {
731 if (remove_special_line()) {
732 int len;
733
734 len = strlen(p_line[p_end]) - 1;
735 (p_line[p_end])[len] = 0;
736 }
737 }
738 break;
739 case '\t':
740 case '\n': /* assume the 2 spaces got eaten */
741 if (repl_beginning && repl_could_be_missing &&
742 (!ptrn_spaces_eaten ||
743 diff_type == NEW_CONTEXT_DIFF)) {
744 repl_missing = true;
745 goto hunk_done;
746 }
747 p_line[p_end] = savestr(buf);
748 if (out_of_mem) {
749 p_end--;
750 return false;
751 }
752 if (p_end != p_ptrn_lines + 1) {
753 ptrn_spaces_eaten |= (repl_beginning != 0);
754 context++;
755 if (!repl_beginning)
756 ptrn_copiable++;
757 p_char[p_end] = ' ';
758 }
759 break;
760 case ' ':
761 if (!isspace((unsigned char)buf[1]) &&
762 repl_beginning && repl_could_be_missing) {
763 repl_missing = true;
764 goto hunk_done;
765 }
766 context++;
767 if (!repl_beginning)
768 ptrn_copiable++;
769 p_line[p_end] = savestr(buf + 2);
770 if (out_of_mem) {
771 p_end--;
772 return false;
773 }
774 break;
775 default:
776 if (repl_beginning && repl_could_be_missing) {
777 repl_missing = true;
778 goto hunk_done;
779 }
780 malformed();
781 }
782 /* set up p_len for strncmp() so we don't have to */
783 /* assume null termination */
784 if (p_line[p_end])
785 p_len[p_end] = strlen(p_line[p_end]);
786 else
787 p_len[p_end] = 0;
788 }
789
790 hunk_done:
791 if (p_end >= 0 && !repl_beginning)
792 fatal("no --- found in patch at line %ld\n", pch_hunk_beg());
793
794 if (repl_missing) {
795
796 /* reset state back to just after --- */
797 p_input_line = repl_patch_line;
798 for (p_end--; p_end > repl_beginning; p_end--)
799 free(p_line[p_end]);
800 fseek(pfp, repl_backtrack_position, SEEK_SET);
801
802 /* redundant 'new' context lines were omitted - set */
803 /* up to fill them in from the old file context */
804 if (!p_context && p_repl_lines == 1) {
805 p_repl_lines = 0;
806 p_max--;
807 }
808 fillsrc = 1;
809 filldst = repl_beginning + 1;
810 fillcnt = p_repl_lines;
811 p_end = p_max;
812 } else if (!p_context && fillcnt == 1) {
813 /* the first hunk was a null hunk with no context */
814 /* and we were expecting one line -- fix it up. */
815 while (filldst < p_end) {
816 p_line[filldst] = p_line[filldst + 1];
817 p_char[filldst] = p_char[filldst + 1];
818 p_len[filldst] = p_len[filldst + 1];
819 filldst++;
820 }
821 #if 0
822 repl_beginning--; /* this doesn't need to be fixed */
823 #endif
824 p_end--;
825 p_first++; /* do append rather than insert */
826 fillcnt = 0;
827 p_ptrn_lines = 0;
828 }
829 if (diff_type == CONTEXT_DIFF &&
830 (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) {
831 if (verbose)
832 say("%s\n%s\n%s\n",
833 "(Fascinating--this is really a new-style context diff but without",
834 "the telltale extra asterisks on the *** line that usually indicate",
835 "the new style...)");
836 diff_type = NEW_CONTEXT_DIFF;
837 }
838 /* if there were omitted context lines, fill them in now */
839 if (fillcnt) {
840 p_bfake = filldst; /* remember where not to free() */
841 p_efake = filldst + fillcnt - 1;
842 while (fillcnt-- > 0) {
843 while (fillsrc <= p_end && p_char[fillsrc] != ' ')
844 fillsrc++;
845 if (fillsrc > p_end)
846 fatal("replacement text or line numbers mangled in hunk at line %ld\n",
847 p_hunk_beg);
848 p_line[filldst] = p_line[fillsrc];
849 p_char[filldst] = p_char[fillsrc];
850 p_len[filldst] = p_len[fillsrc];
851 fillsrc++;
852 filldst++;
853 }
854 while (fillsrc <= p_end && fillsrc != repl_beginning &&
855 p_char[fillsrc] != ' ')
856 fillsrc++;
857 #ifdef DEBUGGING
858 if (debug & 64)
859 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n",
860 fillsrc, filldst, repl_beginning, p_end + 1);
861 #endif
862 if (fillsrc != p_end + 1 && fillsrc != repl_beginning)
863 malformed();
864 if (filldst != p_end + 1 && filldst != repl_beginning)
865 malformed();
866 }
867 if (p_line[p_end] != NULL) {
868 if (remove_special_line()) {
869 p_len[p_end] -= 1;
870 (p_line[p_end])[p_len[p_end]] = 0;
871 }
872 }
873 } else if (diff_type == UNI_DIFF) {
874 LINENUM fillold; /* index of old lines */
875 LINENUM fillnew; /* index of new lines */
876 char ch;
877
878 line_beginning = ftell(pfp); /* file pos of the current line */
879 ret = pgets(buf, buf_len, pfp);
880 p_input_line++;
881 if (ret == NULL || strnNE(buf, "@@ -", 4)) {
882 next_intuit_at(line_beginning, p_input_line);
883 return false;
884 }
885 s = buf + 4;
886 if (!*s)
887 malformed();
888 p_first = getskiplinenum(&s);
889 if (*s == ',') {
890 s++;
891 p_ptrn_lines = getskiplinenum(&s);
892 } else
893 p_ptrn_lines = 1;
894 if (p_first >= LINENUM_MAX - p_ptrn_lines)
895 malformed();
896 if (*s == ' ')
897 s++;
898 if (*s != '+' || !*++s)
899 malformed();
900 p_newfirst = getskiplinenum(&s);
901 if (*s == ',') {
902 s++;
903 p_repl_lines = getskiplinenum(&s);
904 } else
905 p_repl_lines = 1;
906 if (*s == ' ')
907 s++;
908 if (*s != '@')
909 malformed();
910 if (p_first >= LINENUM_MAX - p_ptrn_lines ||
911 p_newfirst > LINENUM_MAX - p_repl_lines ||
912 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1)
913 malformed();
914 if (!p_ptrn_lines)
915 p_first++; /* do append rather than insert */
916 p_max = p_ptrn_lines + p_repl_lines + 1;
917 while (p_max >= hunkmax)
918 grow_hunkmax();
919 fillold = 1;
920 fillnew = fillold + p_ptrn_lines;
921 p_end = fillnew + p_repl_lines;
922 snprintf(buf, buf_len, "*** %ld,%ld ****\n", p_first,
923 p_first + p_ptrn_lines - 1);
924 p_line[0] = savestr(buf);
925 if (out_of_mem) {
926 p_end = -1;
927 return false;
928 }
929 p_char[0] = '*';
930 snprintf(buf, buf_len, "--- %ld,%ld ----\n", p_newfirst,
931 p_newfirst + p_repl_lines - 1);
932 p_line[fillnew] = savestr(buf);
933 if (out_of_mem) {
934 p_end = 0;
935 return false;
936 }
937 p_char[fillnew++] = '=';
938 p_context = 100;
939 context = 0;
940 p_hunk_beg = p_input_line + 1;
941 while (fillold <= p_ptrn_lines || fillnew <= p_end) {
942 line_beginning = ftell(pfp);
943 ret = pgets(buf, buf_len, pfp);
944 p_input_line++;
945 if (ret == NULL) {
946 if (p_max - fillnew < 3) {
947 /* assume blank lines got chopped */
948 strlcpy(buf, " \n", buf_len);
949 } else {
950 fatal("unexpected end of file in patch\n");
951 }
952 }
953 if (*buf == '\t' || *buf == '\n') {
954 ch = ' '; /* assume the space got eaten */
955 s = savestr(buf);
956 } else {
957 ch = *buf;
958 s = savestr(buf + 1);
959 }
960 if (out_of_mem) {
961 while (--fillnew > p_ptrn_lines)
962 free(p_line[fillnew]);
963 p_end = fillold - 1;
964 return false;
965 }
966 switch (ch) {
967 case '-':
968 if (fillold > p_ptrn_lines) {
969 free(s);
970 p_end = fillnew - 1;
971 malformed();
972 }
973 p_char[fillold] = ch;
974 p_line[fillold] = s;
975 p_len[fillold++] = strlen(s);
976 if (fillold > p_ptrn_lines) {
977 if (remove_special_line()) {
978 p_len[fillold - 1] -= 1;
979 s[p_len[fillold - 1]] = 0;
980 }
981 }
982 break;
983 case '=':
984 ch = ' ';
985 /* FALL THROUGH */
986 case ' ':
987 if (fillold > p_ptrn_lines) {
988 free(s);
989 while (--fillnew > p_ptrn_lines)
990 free(p_line[fillnew]);
991 p_end = fillold - 1;
992 malformed();
993 }
994 context++;
995 p_char[fillold] = ch;
996 p_line[fillold] = s;
997 p_len[fillold++] = strlen(s);
998 s = savestr(s);
999 if (out_of_mem) {
1000 while (--fillnew > p_ptrn_lines)
1001 free(p_line[fillnew]);
1002 p_end = fillold - 1;
1003 return false;
1004 }
1005 if (fillold > p_ptrn_lines) {
1006 if (remove_special_line()) {
1007 p_len[fillold - 1] -= 1;
1008 s[p_len[fillold - 1]] = 0;
1009 }
1010 }
1011 /* FALL THROUGH */
1012 case '+':
1013 if (fillnew > p_end) {
1014 free(s);
1015 while (--fillnew > p_ptrn_lines)
1016 free(p_line[fillnew]);
1017 p_end = fillold - 1;
1018 malformed();
1019 }
1020 p_char[fillnew] = ch;
1021 p_line[fillnew] = s;
1022 p_len[fillnew++] = strlen(s);
1023 if (fillold > p_ptrn_lines) {
1024 if (remove_special_line()) {
1025 p_len[fillnew - 1] -= 1;
1026 s[p_len[fillnew - 1]] = 0;
1027 }
1028 }
1029 break;
1030 default:
1031 p_end = fillnew;
1032 malformed();
1033 }
1034 if (ch != ' ' && context > 0) {
1035 if (context < p_context)
1036 p_context = context;
1037 context = -1000;
1038 }
1039 } /* while */
1040 } else { /* normal diff--fake it up */
1041 char hunk_type;
1042 int i;
1043 LINENUM min, max;
1044
1045 line_beginning = ftell(pfp);
1046 p_context = 0;
1047 ret = pgets(buf, buf_len, pfp);
1048 p_input_line++;
1049 if (ret == NULL || !isdigit((unsigned char)*buf)) {
1050 next_intuit_at(line_beginning, p_input_line);
1051 return false;
1052 }
1053 s = buf;
1054 p_first = getskiplinenum(&s);
1055 if (*s == ',') {
1056 s++;
1057 p_ptrn_lines = getskiplinenum(&s) - p_first + 1;
1058 } else
1059 p_ptrn_lines = (*s != 'a');
1060 if (p_first >= LINENUM_MAX - p_ptrn_lines)
1061 malformed();
1062 hunk_type = *s++;
1063 if (hunk_type == 'a')
1064 p_first++; /* do append rather than insert */
1065 min = getskiplinenum(&s);
1066 if (*s == ',')
1067 max = getlinenum(++s);
1068 else
1069 max = min;
1070 if (min < 0 || min > max || max - min == LINENUM_MAX)
1071 malformed();
1072 if (hunk_type == 'd')
1073 min++;
1074 p_end = p_ptrn_lines + 1 + max - min + 1;
1075 p_newfirst = min;
1076 p_repl_lines = max - min + 1;
1077 if (p_newfirst > LINENUM_MAX - p_repl_lines ||
1078 p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1)
1079 malformed();
1080 p_end = p_ptrn_lines + p_repl_lines + 1;
1081 if (p_end > MAXHUNKSIZE)
1082 fatal("hunk too large (%ld lines) at line %ld: %s",
1083 p_end, p_input_line, buf);
1084 while (p_end >= hunkmax)
1085 grow_hunkmax();
1086 snprintf(buf, buf_len, "*** %ld,%ld\n", p_first,
1087 p_first + p_ptrn_lines - 1);
1088 p_line[0] = savestr(buf);
1089 if (out_of_mem) {
1090 p_end = -1;
1091 return false;
1092 }
1093 p_char[0] = '*';
1094 for (i = 1; i <= p_ptrn_lines; i++) {
1095 ret = pgets(buf, buf_len, pfp);
1096 p_input_line++;
1097 if (ret == NULL)
1098 fatal("unexpected end of file in patch at line %ld\n",
1099 p_input_line);
1100 if (*buf != '<')
1101 fatal("< expected at line %ld of patch\n",
1102 p_input_line);
1103 p_line[i] = savestr(buf + 2);
1104 if (out_of_mem) {
1105 p_end = i - 1;
1106 return false;
1107 }
1108 p_len[i] = strlen(p_line[i]);
1109 p_char[i] = '-';
1110 }
1111
1112 if (remove_special_line()) {
1113 p_len[i - 1] -= 1;
1114 (p_line[i - 1])[p_len[i - 1]] = 0;
1115 }
1116 if (hunk_type == 'c') {
1117 ret = pgets(buf, buf_len, pfp);
1118 p_input_line++;
1119 if (ret == NULL)
1120 fatal("unexpected end of file in patch at line %ld\n",
1121 p_input_line);
1122 if (*buf != '-')
1123 fatal("--- expected at line %ld of patch\n",
1124 p_input_line);
1125 }
1126 snprintf(buf, buf_len, "--- %ld,%ld\n", min, max);
1127 p_line[i] = savestr(buf);
1128 if (out_of_mem) {
1129 p_end = i - 1;
1130 return false;
1131 }
1132 p_char[i] = '=';
1133 for (i++; i <= p_end; i++) {
1134 ret = pgets(buf, buf_len, pfp);
1135 p_input_line++;
1136 if (ret == NULL)
1137 fatal("unexpected end of file in patch at line %ld\n",
1138 p_input_line);
1139 if (*buf != '>')
1140 fatal("> expected at line %ld of patch\n",
1141 p_input_line);
1142 p_line[i] = savestr(buf + 2);
1143 if (out_of_mem) {
1144 p_end = i - 1;
1145 return false;
1146 }
1147 p_len[i] = strlen(p_line[i]);
1148 p_char[i] = '+';
1149 }
1150
1151 if (remove_special_line()) {
1152 p_len[i - 1] -= 1;
1153 (p_line[i - 1])[p_len[i - 1]] = 0;
1154 }
1155 }
1156 if (reverse) /* backwards patch? */
1157 if (!pch_swap())
1158 say("Not enough memory to swap next hunk!\n");
1159 #ifdef DEBUGGING
1160 if (debug & 2) {
1161 int i;
1162 char special;
1163
1164 for (i = 0; i <= p_end; i++) {
1165 if (i == p_ptrn_lines)
1166 special = '^';
1167 else
1168 special = ' ';
1169 fprintf(stderr, "%3d %c %c %s", i, p_char[i],
1170 special, p_line[i]);
1171 fflush(stderr);
1172 }
1173 }
1174 #endif
1175 if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */
1176 p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */
1177 return true;
1178 }
1179
1180 /*
1181 * Input a line from the patch file, worrying about indentation.
1182 */
1183 static char *
pgets(char * bf,int sz,FILE * fp)1184 pgets(char *bf, int sz, FILE *fp)
1185 {
1186 char *s, *ret = fgets(bf, sz, fp);
1187 int indent = 0;
1188
1189 if (p_indent && ret != NULL) {
1190 for (s = buf;
1191 indent < p_indent && (*s == ' ' || *s == '\t' || *s == 'X');
1192 s++) {
1193 if (*s == '\t')
1194 indent += 8 - (indent % 7);
1195 else
1196 indent++;
1197 }
1198 if (buf != s && strlcpy(buf, s, buf_len) >= buf_len)
1199 fatal("buffer too small in pgets()\n");
1200 }
1201 return ret;
1202 }
1203
1204 /*
1205 * Reverse the old and new portions of the current hunk.
1206 */
1207 bool
pch_swap(void)1208 pch_swap(void)
1209 {
1210 char **tp_line; /* the text of the hunk */
1211 short *tp_len; /* length of each line */
1212 char *tp_char; /* +, -, and ! */
1213 LINENUM i;
1214 LINENUM n;
1215 bool blankline = false;
1216 char *s;
1217
1218 i = p_first;
1219 p_first = p_newfirst;
1220 p_newfirst = i;
1221
1222 /* make a scratch copy */
1223
1224 tp_line = p_line;
1225 tp_len = p_len;
1226 tp_char = p_char;
1227 p_line = NULL; /* force set_hunkmax to allocate again */
1228 p_len = NULL;
1229 p_char = NULL;
1230 set_hunkmax();
1231 if (p_line == NULL || p_len == NULL || p_char == NULL) {
1232
1233 free(p_line);
1234 p_line = tp_line;
1235 free(p_len);
1236 p_len = tp_len;
1237 free(p_char);
1238 p_char = tp_char;
1239 return false; /* not enough memory to swap hunk! */
1240 }
1241 /* now turn the new into the old */
1242
1243 i = p_ptrn_lines + 1;
1244 if (tp_char[i] == '\n') { /* account for possible blank line */
1245 blankline = true;
1246 i++;
1247 }
1248 if (p_efake >= 0) { /* fix non-freeable ptr range */
1249 if (p_efake <= i)
1250 n = p_end - i + 1;
1251 else
1252 n = -i;
1253 p_efake += n;
1254 p_bfake += n;
1255 }
1256 for (n = 0; i <= p_end; i++, n++) {
1257 p_line[n] = tp_line[i];
1258 p_char[n] = tp_char[i];
1259 if (p_char[n] == '+')
1260 p_char[n] = '-';
1261 p_len[n] = tp_len[i];
1262 }
1263 if (blankline) {
1264 i = p_ptrn_lines + 1;
1265 p_line[n] = tp_line[i];
1266 p_char[n] = tp_char[i];
1267 p_len[n] = tp_len[i];
1268 n++;
1269 }
1270 if (p_char[0] != '=')
1271 fatal("Malformed patch at line %ld: expected '=' found '%c'\n",
1272 p_input_line, p_char[0]);
1273 p_char[0] = '*';
1274 for (s = p_line[0]; *s; s++)
1275 if (*s == '-')
1276 *s = '*';
1277
1278 /* now turn the old into the new */
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 tp_char[0] = '=';
1284 for (s = tp_line[0]; *s; s++)
1285 if (*s == '*')
1286 *s = '-';
1287 for (i = 0; n <= p_end; i++, n++) {
1288 p_line[n] = tp_line[i];
1289 p_char[n] = tp_char[i];
1290 if (p_char[n] == '-')
1291 p_char[n] = '+';
1292 p_len[n] = tp_len[i];
1293 }
1294
1295 if (i != p_ptrn_lines + 1)
1296 fatal("Malformed patch at line %ld: expected %ld lines, "
1297 "got %ld\n",
1298 p_input_line, p_ptrn_lines + 1, i);
1299
1300 i = p_ptrn_lines;
1301 p_ptrn_lines = p_repl_lines;
1302 p_repl_lines = i;
1303
1304 free(tp_line);
1305 free(tp_len);
1306 free(tp_char);
1307
1308 return true;
1309 }
1310
1311 /*
1312 * Return the specified line position in the old file of the old context.
1313 */
1314 LINENUM
pch_first(void)1315 pch_first(void)
1316 {
1317 return p_first;
1318 }
1319
1320 /*
1321 * Return the number of lines of old context.
1322 */
1323 LINENUM
pch_ptrn_lines(void)1324 pch_ptrn_lines(void)
1325 {
1326 return p_ptrn_lines;
1327 }
1328
1329 /*
1330 * Return the probable line position in the new file of the first line.
1331 */
1332 LINENUM
pch_newfirst(void)1333 pch_newfirst(void)
1334 {
1335 return p_newfirst;
1336 }
1337
1338 /*
1339 * Return the number of lines in the replacement text including context.
1340 */
1341 LINENUM
pch_repl_lines(void)1342 pch_repl_lines(void)
1343 {
1344 return p_repl_lines;
1345 }
1346
1347 /*
1348 * Return the number of lines in the whole hunk.
1349 */
1350 LINENUM
pch_end(void)1351 pch_end(void)
1352 {
1353 return p_end;
1354 }
1355
1356 /*
1357 * Return the number of context lines before the first changed line.
1358 */
1359 LINENUM
pch_context(void)1360 pch_context(void)
1361 {
1362 return p_context;
1363 }
1364
1365 /*
1366 * Return the length of a particular patch line.
1367 */
1368 short
pch_line_len(LINENUM line)1369 pch_line_len(LINENUM line)
1370 {
1371 return p_len[line];
1372 }
1373
1374 /*
1375 * Return the control character (+, -, *, !, etc) for a patch line.
1376 */
1377 char
pch_char(LINENUM line)1378 pch_char(LINENUM line)
1379 {
1380 return p_char[line];
1381 }
1382
1383 /*
1384 * Return a pointer to a particular patch line.
1385 */
1386 char *
pfetch(LINENUM line)1387 pfetch(LINENUM line)
1388 {
1389 return p_line[line];
1390 }
1391
1392 /*
1393 * Return where in the patch file this hunk began, for error messages.
1394 */
1395 LINENUM
pch_hunk_beg(void)1396 pch_hunk_beg(void)
1397 {
1398 return p_hunk_beg;
1399 }
1400
1401 /*
1402 * Apply an ed script by feeding ed itself.
1403 */
1404 void
do_ed_script(void)1405 do_ed_script(void)
1406 {
1407 char *t;
1408 long beginning_of_this_line;
1409 FILE *pipefp = NULL;
1410 int continuation;
1411
1412 if (!skip_rest_of_patch) {
1413 if (copy_file(filearg[0], TMPOUTNAME) < 0) {
1414 unlink(TMPOUTNAME);
1415 fatal("can't create temp file %s", TMPOUTNAME);
1416 }
1417 snprintf(buf, buf_len, "%s%s%s", _PATH_ED,
1418 verbose ? " " : " -s ", TMPOUTNAME);
1419 pipefp = popen(buf, "w");
1420 }
1421 for (;;) {
1422 beginning_of_this_line = ftell(pfp);
1423 if (pgets(buf, buf_len, pfp) == NULL) {
1424 next_intuit_at(beginning_of_this_line, p_input_line);
1425 break;
1426 }
1427 p_input_line++;
1428 for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++)
1429 ;
1430 /* POSIX defines allowed commands as {a,c,d,i,s} */
1431 if (isdigit((unsigned char)*buf) && (*t == 'a' || *t == 'c' ||
1432 *t == 'd' || *t == 'i' || *t == 's')) {
1433 if (pipefp != NULL)
1434 fputs(buf, pipefp);
1435 if (*t == 's') {
1436 for (;;) {
1437 continuation = 0;
1438 t = strchr(buf, '\0') - 1;
1439 while (--t >= buf && *t == '\\')
1440 continuation = !continuation;
1441 if (!continuation ||
1442 pgets(buf, sizeof buf, pfp) == NULL)
1443 break;
1444 if (pipefp != NULL)
1445 fputs(buf, pipefp);
1446 }
1447 } else if (*t != 'd') {
1448 while (pgets(buf, buf_len, pfp) != NULL) {
1449 p_input_line++;
1450 if (pipefp != NULL)
1451 fputs(buf, pipefp);
1452 if (strEQ(buf, ".\n"))
1453 break;
1454 }
1455 }
1456 } else {
1457 next_intuit_at(beginning_of_this_line, p_input_line);
1458 break;
1459 }
1460 }
1461 if (pipefp == NULL)
1462 return;
1463 fprintf(pipefp, "w\n");
1464 fprintf(pipefp, "q\n");
1465 fflush(pipefp);
1466 pclose(pipefp);
1467 ignore_signals();
1468 if (!check_only) {
1469 if (move_file(TMPOUTNAME, outname) < 0) {
1470 toutkeep = true;
1471 chmod(TMPOUTNAME, filemode);
1472 } else
1473 chmod(outname, filemode);
1474 }
1475 set_signals(1);
1476 }
1477
1478 /*
1479 * Choose the name of the file to be patched based on POSIX rules.
1480 * NOTE: the POSIX rules are amazingly stupid and we only follow them
1481 * if the user specified --posix or set POSIXLY_CORRECT.
1482 */
1483 static char *
posix_name(const struct file_name * names,bool assume_exists)1484 posix_name(const struct file_name *names, bool assume_exists)
1485 {
1486 char *path = NULL;
1487 int i;
1488
1489 /*
1490 * POSIX states that the filename will be chosen from one
1491 * of the old, new and index names (in that order) if
1492 * the file exists relative to CWD after -p stripping.
1493 */
1494 for (i = 0; i < MAX_FILE; i++) {
1495 if (names[i].path != NULL && names[i].exists) {
1496 path = names[i].path;
1497 break;
1498 }
1499 }
1500 if (path == NULL && !assume_exists) {
1501 /*
1502 * No files found, look for something we can checkout from
1503 * RCS/SCCS dirs. Same order as above.
1504 */
1505 for (i = 0; i < MAX_FILE; i++) {
1506 if (names[i].path != NULL &&
1507 (path = checked_in(names[i].path)) != NULL)
1508 break;
1509 }
1510 /*
1511 * Still no match? Check to see if the diff could be creating
1512 * a new file.
1513 */
1514 if (path == NULL && ok_to_create_file &&
1515 names[NEW_FILE].path != NULL)
1516 path = names[NEW_FILE].path;
1517 }
1518
1519 return path ? savestr(path) : NULL;
1520 }
1521
1522 /*
1523 * Choose the name of the file to be patched based the "best" one
1524 * available.
1525 */
1526 static char *
best_name(const struct file_name * names,bool assume_exists)1527 best_name(const struct file_name *names, bool assume_exists)
1528 {
1529 size_t min_components, min_baselen, min_len, tmp;
1530 char *best = NULL;
1531 int i;
1532
1533 /*
1534 * The "best" name is the one with the fewest number of path
1535 * components, the shortest basename length, and the shortest
1536 * overall length (in that order). We only use the Index: file
1537 * if neither of the old or new files could be intuited from
1538 * the diff header.
1539 */
1540 min_components = min_baselen = min_len = SIZE_MAX;
1541 for (i = INDEX_FILE; i >= OLD_FILE; i--) {
1542 if (names[i].path == NULL ||
1543 (!names[i].exists && !assume_exists))
1544 continue;
1545 if ((tmp = num_components(names[i].path)) > min_components)
1546 continue;
1547 min_components = tmp;
1548 if ((tmp = strlen(basename(names[i].path))) > min_baselen)
1549 continue;
1550 min_baselen = tmp;
1551 if ((tmp = strlen(names[i].path)) > min_len)
1552 continue;
1553 min_len = tmp;
1554 best = names[i].path;
1555 }
1556 if (best == NULL) {
1557 /*
1558 * No files found, look for something we can checkout from
1559 * RCS/SCCS dirs. Logic is identical to that above...
1560 */
1561 min_components = min_baselen = min_len = SIZE_MAX;
1562 for (i = INDEX_FILE; i >= OLD_FILE; i--) {
1563 if (names[i].path == NULL ||
1564 checked_in(names[i].path) == NULL)
1565 continue;
1566 if ((tmp = num_components(names[i].path)) > min_components)
1567 continue;
1568 min_components = tmp;
1569 if ((tmp = strlen(basename(names[i].path))) > min_baselen)
1570 continue;
1571 min_baselen = tmp;
1572 if ((tmp = strlen(names[i].path)) > min_len)
1573 continue;
1574 min_len = tmp;
1575 best = names[i].path;
1576 }
1577 /*
1578 * Still no match? Check to see if the diff could be creating
1579 * a new file.
1580 */
1581 if (best == NULL && ok_to_create_file &&
1582 names[NEW_FILE].path != NULL)
1583 best = names[NEW_FILE].path;
1584 }
1585
1586 return best ? savestr(best) : NULL;
1587 }
1588
1589 static size_t
num_components(const char * path)1590 num_components(const char *path)
1591 {
1592 size_t n;
1593 const char *cp;
1594
1595 for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) {
1596 while (*cp == '/')
1597 cp++; /* skip consecutive slashes */
1598 }
1599 return n;
1600 }
1601