/
apply.c
2004 lines (1781 loc) · 46.7 KB
/
apply.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* apply.c
*
* Copyright (C) Linus Torvalds, 2005
*
* This applies patches on top of some (arbitrary) version of the SCM.
*
*/
#include <fnmatch.h>
#include "cache.h"
#include "quote.h"
// --check turns on checking that the working tree matches the
// files that are being modified, but doesn't apply the patch
// --stat does just a diffstat, and doesn't actually apply
// --numstat does numeric diffstat, and doesn't actually apply
// --index-info shows the old and new index info for paths if available.
//
static const char *prefix;
static int prefix_length = -1;
static int p_value = 1;
static int allow_binary_replacement = 0;
static int check_index = 0;
static int write_index = 0;
static int diffstat = 0;
static int numstat = 0;
static int summary = 0;
static int check = 0;
static int apply = 1;
static int no_add = 0;
static int show_index_info = 0;
static int line_termination = '\n';
static const char apply_usage[] =
"git-apply [--stat] [--numstat] [--summary] [--check] [--index] [--apply] [--no-add] [--index-info] [--allow-binary-replacement] [-z] [-pNUM] [--whitespace=<nowarn|warn|error|error-all|strip>] <patch>...";
static enum whitespace_eol {
nowarn_whitespace,
warn_on_whitespace,
error_on_whitespace,
strip_whitespace,
} new_whitespace = warn_on_whitespace;
static int whitespace_error = 0;
static int squelch_whitespace_errors = 5;
static int applied_after_stripping = 0;
static const char *patch_input_file = NULL;
static void parse_whitespace_option(const char *option)
{
if (!option) {
new_whitespace = warn_on_whitespace;
return;
}
if (!strcmp(option, "warn")) {
new_whitespace = warn_on_whitespace;
return;
}
if (!strcmp(option, "nowarn")) {
new_whitespace = nowarn_whitespace;
return;
}
if (!strcmp(option, "error")) {
new_whitespace = error_on_whitespace;
return;
}
if (!strcmp(option, "error-all")) {
new_whitespace = error_on_whitespace;
squelch_whitespace_errors = 0;
return;
}
if (!strcmp(option, "strip")) {
new_whitespace = strip_whitespace;
return;
}
die("unrecognized whitespace option '%s'", option);
}
static void set_default_whitespace_mode(const char *whitespace_option)
{
if (!whitespace_option && !apply_default_whitespace) {
new_whitespace = (apply
? warn_on_whitespace
: nowarn_whitespace);
}
}
/*
* For "diff-stat" like behaviour, we keep track of the biggest change
* we've seen, and the longest filename. That allows us to do simple
* scaling.
*/
static int max_change, max_len;
/*
* Various "current state", notably line numbers and what
* file (and how) we're patching right now.. The "is_xxxx"
* things are flags, where -1 means "don't know yet".
*/
static int linenr = 1;
struct fragment {
unsigned long oldpos, oldlines;
unsigned long newpos, newlines;
const char *patch;
int size;
struct fragment *next;
};
struct patch {
char *new_name, *old_name, *def_name;
unsigned int old_mode, new_mode;
int is_rename, is_copy, is_new, is_delete, is_binary;
int lines_added, lines_deleted;
int score;
struct fragment *fragments;
char *result;
unsigned long resultsize;
char old_sha1_prefix[41];
char new_sha1_prefix[41];
struct patch *next;
};
#define CHUNKSIZE (8192)
#define SLOP (16)
static void *read_patch_file(int fd, unsigned long *sizep)
{
unsigned long size = 0, alloc = CHUNKSIZE;
void *buffer = xmalloc(alloc);
for (;;) {
int nr = alloc - size;
if (nr < 1024) {
alloc += CHUNKSIZE;
buffer = xrealloc(buffer, alloc);
nr = alloc - size;
}
nr = xread(fd, buffer + size, nr);
if (!nr)
break;
if (nr < 0)
die("git-apply: read returned %s", strerror(errno));
size += nr;
}
*sizep = size;
/*
* Make sure that we have some slop in the buffer
* so that we can do speculative "memcmp" etc, and
* see to it that it is NUL-filled.
*/
if (alloc < size + SLOP)
buffer = xrealloc(buffer, size + SLOP);
memset(buffer + size, 0, SLOP);
return buffer;
}
static unsigned long linelen(const char *buffer, unsigned long size)
{
unsigned long len = 0;
while (size--) {
len++;
if (*buffer++ == '\n')
break;
}
return len;
}
static int is_dev_null(const char *str)
{
return !memcmp("/dev/null", str, 9) && isspace(str[9]);
}
#define TERM_SPACE 1
#define TERM_TAB 2
static int name_terminate(const char *name, int namelen, int c, int terminate)
{
if (c == ' ' && !(terminate & TERM_SPACE))
return 0;
if (c == '\t' && !(terminate & TERM_TAB))
return 0;
return 1;
}
static char * find_name(const char *line, char *def, int p_value, int terminate)
{
int len;
const char *start = line;
char *name;
if (*line == '"') {
/* Proposed "new-style" GNU patch/diff format; see
* http://marc.theaimsgroup.com/?l=git&m=112927316408690&w=2
*/
name = unquote_c_style(line, NULL);
if (name) {
char *cp = name;
while (p_value) {
cp = strchr(name, '/');
if (!cp)
break;
cp++;
p_value--;
}
if (cp) {
/* name can later be freed, so we need
* to memmove, not just return cp
*/
memmove(name, cp, strlen(cp) + 1);
free(def);
return name;
}
else {
free(name);
name = NULL;
}
}
}
for (;;) {
char c = *line;
if (isspace(c)) {
if (c == '\n')
break;
if (name_terminate(start, line-start, c, terminate))
break;
}
line++;
if (c == '/' && !--p_value)
start = line;
}
if (!start)
return def;
len = line - start;
if (!len)
return def;
/*
* Generally we prefer the shorter name, especially
* if the other one is just a variation of that with
* something else tacked on to the end (ie "file.orig"
* or "file~").
*/
if (def) {
int deflen = strlen(def);
if (deflen < len && !strncmp(start, def, deflen))
return def;
}
name = xmalloc(len + 1);
memcpy(name, start, len);
name[len] = 0;
free(def);
return name;
}
/*
* Get the name etc info from the --/+++ lines of a traditional patch header
*
* NOTE! This hardcodes "-p1" behaviour in filename detection.
*
* FIXME! The end-of-filename heuristics are kind of screwy. For existing
* files, we can happily check the index for a match, but for creating a
* new file we should try to match whatever "patch" does. I have no idea.
*/
static void parse_traditional_patch(const char *first, const char *second, struct patch *patch)
{
char *name;
first += 4; // skip "--- "
second += 4; // skip "+++ "
if (is_dev_null(first)) {
patch->is_new = 1;
patch->is_delete = 0;
name = find_name(second, NULL, p_value, TERM_SPACE | TERM_TAB);
patch->new_name = name;
} else if (is_dev_null(second)) {
patch->is_new = 0;
patch->is_delete = 1;
name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
patch->old_name = name;
} else {
name = find_name(first, NULL, p_value, TERM_SPACE | TERM_TAB);
name = find_name(second, name, p_value, TERM_SPACE | TERM_TAB);
patch->old_name = patch->new_name = name;
}
if (!name)
die("unable to find filename in patch at line %d", linenr);
}
static int gitdiff_hdrend(const char *line, struct patch *patch)
{
return -1;
}
/*
* We're anal about diff header consistency, to make
* sure that we don't end up having strange ambiguous
* patches floating around.
*
* As a result, gitdiff_{old|new}name() will check
* their names against any previous information, just
* to make sure..
*/
static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, const char *oldnew)
{
if (!orig_name && !isnull)
return find_name(line, NULL, 1, 0);
if (orig_name) {
int len;
const char *name;
char *another;
name = orig_name;
len = strlen(name);
if (isnull)
die("git-apply: bad git-diff - expected /dev/null, got %s on line %d", name, linenr);
another = find_name(line, NULL, 1, 0);
if (!another || memcmp(another, name, len))
die("git-apply: bad git-diff - inconsistent %s filename on line %d", oldnew, linenr);
free(another);
return orig_name;
}
else {
/* expect "/dev/null" */
if (memcmp("/dev/null", line, 9) || line[9] != '\n')
die("git-apply: bad git-diff - expected /dev/null on line %d", linenr);
return NULL;
}
}
static int gitdiff_oldname(const char *line, struct patch *patch)
{
patch->old_name = gitdiff_verify_name(line, patch->is_new, patch->old_name, "old");
return 0;
}
static int gitdiff_newname(const char *line, struct patch *patch)
{
patch->new_name = gitdiff_verify_name(line, patch->is_delete, patch->new_name, "new");
return 0;
}
static int gitdiff_oldmode(const char *line, struct patch *patch)
{
patch->old_mode = strtoul(line, NULL, 8);
return 0;
}
static int gitdiff_newmode(const char *line, struct patch *patch)
{
patch->new_mode = strtoul(line, NULL, 8);
return 0;
}
static int gitdiff_delete(const char *line, struct patch *patch)
{
patch->is_delete = 1;
patch->old_name = patch->def_name;
return gitdiff_oldmode(line, patch);
}
static int gitdiff_newfile(const char *line, struct patch *patch)
{
patch->is_new = 1;
patch->new_name = patch->def_name;
return gitdiff_newmode(line, patch);
}
static int gitdiff_copysrc(const char *line, struct patch *patch)
{
patch->is_copy = 1;
patch->old_name = find_name(line, NULL, 0, 0);
return 0;
}
static int gitdiff_copydst(const char *line, struct patch *patch)
{
patch->is_copy = 1;
patch->new_name = find_name(line, NULL, 0, 0);
return 0;
}
static int gitdiff_renamesrc(const char *line, struct patch *patch)
{
patch->is_rename = 1;
patch->old_name = find_name(line, NULL, 0, 0);
return 0;
}
static int gitdiff_renamedst(const char *line, struct patch *patch)
{
patch->is_rename = 1;
patch->new_name = find_name(line, NULL, 0, 0);
return 0;
}
static int gitdiff_similarity(const char *line, struct patch *patch)
{
if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
patch->score = 0;
return 0;
}
static int gitdiff_dissimilarity(const char *line, struct patch *patch)
{
if ((patch->score = strtoul(line, NULL, 10)) == ULONG_MAX)
patch->score = 0;
return 0;
}
static int gitdiff_index(const char *line, struct patch *patch)
{
/* index line is N hexadecimal, "..", N hexadecimal,
* and optional space with octal mode.
*/
const char *ptr, *eol;
int len;
ptr = strchr(line, '.');
if (!ptr || ptr[1] != '.' || 40 < ptr - line)
return 0;
len = ptr - line;
memcpy(patch->old_sha1_prefix, line, len);
patch->old_sha1_prefix[len] = 0;
line = ptr + 2;
ptr = strchr(line, ' ');
eol = strchr(line, '\n');
if (!ptr || eol < ptr)
ptr = eol;
len = ptr - line;
if (40 < len)
return 0;
memcpy(patch->new_sha1_prefix, line, len);
patch->new_sha1_prefix[len] = 0;
if (*ptr == ' ')
patch->new_mode = patch->old_mode = strtoul(ptr+1, NULL, 8);
return 0;
}
/*
* This is normal for a diff that doesn't change anything: we'll fall through
* into the next diff. Tell the parser to break out.
*/
static int gitdiff_unrecognized(const char *line, struct patch *patch)
{
return -1;
}
static const char *stop_at_slash(const char *line, int llen)
{
int i;
for (i = 0; i < llen; i++) {
int ch = line[i];
if (ch == '/')
return line + i;
}
return NULL;
}
/* This is to extract the same name that appears on "diff --git"
* line. We do not find and return anything if it is a rename
* patch, and it is OK because we will find the name elsewhere.
* We need to reliably find name only when it is mode-change only,
* creation or deletion of an empty file. In any of these cases,
* both sides are the same name under a/ and b/ respectively.
*/
static char *git_header_name(char *line, int llen)
{
int len;
const char *name;
const char *second = NULL;
line += strlen("diff --git ");
llen -= strlen("diff --git ");
if (*line == '"') {
const char *cp;
char *first = unquote_c_style(line, &second);
if (!first)
return NULL;
/* advance to the first slash */
cp = stop_at_slash(first, strlen(first));
if (!cp || cp == first) {
/* we do not accept absolute paths */
free_first_and_fail:
free(first);
return NULL;
}
len = strlen(cp+1);
memmove(first, cp+1, len+1); /* including NUL */
/* second points at one past closing dq of name.
* find the second name.
*/
while ((second < line + llen) && isspace(*second))
second++;
if (line + llen <= second)
goto free_first_and_fail;
if (*second == '"') {
char *sp = unquote_c_style(second, NULL);
if (!sp)
goto free_first_and_fail;
cp = stop_at_slash(sp, strlen(sp));
if (!cp || cp == sp) {
free_both_and_fail:
free(sp);
goto free_first_and_fail;
}
/* They must match, otherwise ignore */
if (strcmp(cp+1, first))
goto free_both_and_fail;
free(sp);
return first;
}
/* unquoted second */
cp = stop_at_slash(second, line + llen - second);
if (!cp || cp == second)
goto free_first_and_fail;
cp++;
if (line + llen - cp != len + 1 ||
memcmp(first, cp, len))
goto free_first_and_fail;
return first;
}
/* unquoted first name */
name = stop_at_slash(line, llen);
if (!name || name == line)
return NULL;
name++;
/* since the first name is unquoted, a dq if exists must be
* the beginning of the second name.
*/
for (second = name; second < line + llen; second++) {
if (*second == '"') {
const char *cp = second;
const char *np;
char *sp = unquote_c_style(second, NULL);
if (!sp)
return NULL;
np = stop_at_slash(sp, strlen(sp));
if (!np || np == sp) {
free_second_and_fail:
free(sp);
return NULL;
}
np++;
len = strlen(np);
if (len < cp - name &&
!strncmp(np, name, len) &&
isspace(name[len])) {
/* Good */
memmove(sp, np, len + 1);
return sp;
}
goto free_second_and_fail;
}
}
/*
* Accept a name only if it shows up twice, exactly the same
* form.
*/
for (len = 0 ; ; len++) {
char c = name[len];
switch (c) {
default:
continue;
case '\n':
return NULL;
case '\t': case ' ':
second = name+len;
for (;;) {
char c = *second++;
if (c == '\n')
return NULL;
if (c == '/')
break;
}
if (second[len] == '\n' && !memcmp(name, second, len)) {
char *ret = xmalloc(len + 1);
memcpy(ret, name, len);
ret[len] = 0;
return ret;
}
}
}
return NULL;
}
/* Verify that we recognize the lines following a git header */
static int parse_git_header(char *line, int len, unsigned int size, struct patch *patch)
{
unsigned long offset;
/* A git diff has explicit new/delete information, so we don't guess */
patch->is_new = 0;
patch->is_delete = 0;
/*
* Some things may not have the old name in the
* rest of the headers anywhere (pure mode changes,
* or removing or adding empty files), so we get
* the default name from the header.
*/
patch->def_name = git_header_name(line, len);
line += len;
size -= len;
linenr++;
for (offset = len ; size > 0 ; offset += len, size -= len, line += len, linenr++) {
static const struct opentry {
const char *str;
int (*fn)(const char *, struct patch *);
} optable[] = {
{ "@@ -", gitdiff_hdrend },
{ "--- ", gitdiff_oldname },
{ "+++ ", gitdiff_newname },
{ "old mode ", gitdiff_oldmode },
{ "new mode ", gitdiff_newmode },
{ "deleted file mode ", gitdiff_delete },
{ "new file mode ", gitdiff_newfile },
{ "copy from ", gitdiff_copysrc },
{ "copy to ", gitdiff_copydst },
{ "rename old ", gitdiff_renamesrc },
{ "rename new ", gitdiff_renamedst },
{ "rename from ", gitdiff_renamesrc },
{ "rename to ", gitdiff_renamedst },
{ "similarity index ", gitdiff_similarity },
{ "dissimilarity index ", gitdiff_dissimilarity },
{ "index ", gitdiff_index },
{ "", gitdiff_unrecognized },
};
int i;
len = linelen(line, size);
if (!len || line[len-1] != '\n')
break;
for (i = 0; i < ARRAY_SIZE(optable); i++) {
const struct opentry *p = optable + i;
int oplen = strlen(p->str);
if (len < oplen || memcmp(p->str, line, oplen))
continue;
if (p->fn(line + oplen, patch) < 0)
return offset;
break;
}
}
return offset;
}
static int parse_num(const char *line, unsigned long *p)
{
char *ptr;
if (!isdigit(*line))
return 0;
*p = strtoul(line, &ptr, 10);
return ptr - line;
}
static int parse_range(const char *line, int len, int offset, const char *expect,
unsigned long *p1, unsigned long *p2)
{
int digits, ex;
if (offset < 0 || offset >= len)
return -1;
line += offset;
len -= offset;
digits = parse_num(line, p1);
if (!digits)
return -1;
offset += digits;
line += digits;
len -= digits;
*p2 = 1;
if (*line == ',') {
digits = parse_num(line+1, p2);
if (!digits)
return -1;
offset += digits+1;
line += digits+1;
len -= digits+1;
}
ex = strlen(expect);
if (ex > len)
return -1;
if (memcmp(line, expect, ex))
return -1;
return offset + ex;
}
/*
* Parse a unified diff fragment header of the
* form "@@ -a,b +c,d @@"
*/
static int parse_fragment_header(char *line, int len, struct fragment *fragment)
{
int offset;
if (!len || line[len-1] != '\n')
return -1;
/* Figure out the number of lines in a fragment */
offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines);
offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines);
return offset;
}
static int find_header(char *line, unsigned long size, int *hdrsize, struct patch *patch)
{
unsigned long offset, len;
patch->is_rename = patch->is_copy = 0;
patch->is_new = patch->is_delete = -1;
patch->old_mode = patch->new_mode = 0;
patch->old_name = patch->new_name = NULL;
for (offset = 0; size > 0; offset += len, size -= len, line += len, linenr++) {
unsigned long nextlen;
len = linelen(line, size);
if (!len)
break;
/* Testing this early allows us to take a few shortcuts.. */
if (len < 6)
continue;
/*
* Make sure we don't find any unconnected patch fragmants.
* That's a sign that we didn't find a header, and that a
* patch has become corrupted/broken up.
*/
if (!memcmp("@@ -", line, 4)) {
struct fragment dummy;
if (parse_fragment_header(line, len, &dummy) < 0)
continue;
error("patch fragment without header at line %d: %.*s", linenr, (int)len-1, line);
}
if (size < len + 6)
break;
/*
* Git patch? It might not have a real patch, just a rename
* or mode change, so we handle that specially
*/
if (!memcmp("diff --git ", line, 11)) {
int git_hdr_len = parse_git_header(line, len, size, patch);
if (git_hdr_len <= len)
continue;
if (!patch->old_name && !patch->new_name) {
if (!patch->def_name)
die("git diff header lacks filename information (line %d)", linenr);
patch->old_name = patch->new_name = patch->def_name;
}
*hdrsize = git_hdr_len;
return offset;
}
/** --- followed by +++ ? */
if (memcmp("--- ", line, 4) || memcmp("+++ ", line + len, 4))
continue;
/*
* We only accept unified patches, so we want it to
* at least have "@@ -a,b +c,d @@\n", which is 14 chars
* minimum
*/
nextlen = linelen(line + len, size - len);
if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4))
continue;
/* Ok, we'll consider it a patch */
parse_traditional_patch(line, line+len, patch);
*hdrsize = len + nextlen;
linenr += 2;
return offset;
}
return -1;
}
/*
* Parse a unified diff. Note that this really needs
* to parse each fragment separately, since the only
* way to know the difference between a "---" that is
* part of a patch, and a "---" that starts the next
* patch is to look at the line counts..
*/
static int parse_fragment(char *line, unsigned long size, struct patch *patch, struct fragment *fragment)
{
int added, deleted;
int len = linelen(line, size), offset;
unsigned long oldlines, newlines;
offset = parse_fragment_header(line, len, fragment);
if (offset < 0)
return -1;
oldlines = fragment->oldlines;
newlines = fragment->newlines;
if (patch->is_new < 0) {
patch->is_new = !oldlines;
if (!oldlines)
patch->old_name = NULL;
}
if (patch->is_delete < 0) {
patch->is_delete = !newlines;
if (!newlines)
patch->new_name = NULL;
}
if (patch->is_new && oldlines)
return error("new file depends on old contents");
if (patch->is_delete != !newlines) {
if (newlines)
return error("deleted file still has contents");
fprintf(stderr, "** warning: file %s becomes empty but is not deleted\n", patch->new_name);
}
/* Parse the thing.. */
line += len;
size -= len;
linenr++;
added = deleted = 0;
for (offset = len; size > 0; offset += len, size -= len, line += len, linenr++) {
if (!oldlines && !newlines)
break;
len = linelen(line, size);
if (!len || line[len-1] != '\n')
return -1;
switch (*line) {
default:
return -1;
case ' ':
oldlines--;
newlines--;
break;
case '-':
deleted++;
oldlines--;
break;
case '+':
/*
* We know len is at least two, since we have a '+' and
* we checked that the last character was a '\n' above.
* That is, an addition of an empty line would check
* the '+' here. Sneaky...
*/
if ((new_whitespace != nowarn_whitespace) &&
isspace(line[len-2])) {
whitespace_error++;
if (squelch_whitespace_errors &&
squelch_whitespace_errors <
whitespace_error)
;
else {
fprintf(stderr, "Adds trailing whitespace.\n%s:%d:%.*s\n",
patch_input_file,
linenr, len-2, line+1);
}
}
added++;
newlines--;
break;
/* We allow "\ No newline at end of file". Depending
* on locale settings when the patch was produced we
* don't know what this line looks like. The only
* thing we do know is that it begins with "\ ".
* Checking for 12 is just for sanity check -- any
* l10n of "\ No newline..." is at least that long.
*/
case '\\':
if (len < 12 || memcmp(line, "\\ ", 2))
return -1;
break;
}
}
if (oldlines || newlines)
return -1;
/* If a fragment ends with an incomplete line, we failed to include
* it in the above loop because we hit oldlines == newlines == 0
* before seeing it.
*/
if (12 < size && !memcmp(line, "\\ ", 2))
offset += linelen(line, size);
patch->lines_added += added;
patch->lines_deleted += deleted;
return offset;
}
static int parse_single_patch(char *line, unsigned long size, struct patch *patch)
{
unsigned long offset = 0;
struct fragment **fragp = &patch->fragments;
while (size > 4 && !memcmp(line, "@@ -", 4)) {
struct fragment *fragment;
int len;
fragment = xmalloc(sizeof(*fragment));
memset(fragment, 0, sizeof(*fragment));
len = parse_fragment(line, size, patch, fragment);
if (len <= 0)
die("corrupt patch at line %d", linenr);
fragment->patch = line;
fragment->size = len;
*fragp = fragment;
fragp = &fragment->next;
offset += len;
line += len;
size -= len;
}
return offset;
}
static inline int metadata_changes(struct patch *patch)
{
return patch->is_rename > 0 ||
patch->is_copy > 0 ||
patch->is_new > 0 ||
patch->is_delete ||
(patch->old_mode && patch->new_mode &&
patch->old_mode != patch->new_mode);
}
static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
{
int hdrsize, patchsize;
int offset = find_header(buffer, size, &hdrsize, patch);
if (offset < 0)
return offset;
patchsize = parse_single_patch(buffer + offset + hdrsize, size - offset - hdrsize, patch);
if (!patchsize) {
static const char *binhdr[] = {
"Binary files ",
"Files ",
NULL,
};
int i;
int hd = hdrsize + offset;
unsigned long llen = linelen(buffer + hd, size - hd);
if (!memcmp(" differ\n", buffer + hd + llen - 8, 8))
for (i = 0; binhdr[i]; i++) {
int len = strlen(binhdr[i]);
if (len < size - hd &&
!memcmp(binhdr[i], buffer + hd, len)) {
patch->is_binary = 1;
break;
}
}
/* Empty patch cannot be applied if:
* - it is a binary patch and we do not do binary_replace, or
* - text patch without metadata change
*/
if ((apply || check) &&
(patch->is_binary
? !allow_binary_replacement
: !metadata_changes(patch)))
die("patch with only garbage at line %d", linenr);
}
return offset + hdrsize + patchsize;
}
static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";