Make 'index_path()' use 'strbuf_readlink()'
[git/git.git] / diff.c
CommitLineData
6973dcae
JH
1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
6973dcae
JH
4#include "cache.h"
5#include "quote.h"
6#include "diff.h"
7#include "diffcore.h"
051308f6 8#include "delta.h"
6973dcae 9#include "xdiff-interface.h"
7c92fe0e 10#include "color.h"
8c701249 11#include "attr.h"
d5535ec7 12#include "run-command.h"
23707811 13#include "utf8.h"
be58e70d 14#include "userdiff.h"
6973dcae 15
1510fea7
SP
16#ifdef NO_FAST_WORKING_DIRECTORY
17#define FAST_WORKING_DIRECTORY 0
18#else
19#define FAST_WORKING_DIRECTORY 1
20#endif
21
96f1e58f 22static int diff_detect_rename_default;
50705915 23static int diff_rename_limit_default = 200;
a624eaa7 24static int diff_suppress_blank_empty;
6b2f2d98 25int diff_use_color_default = -1;
cbe02100 26static const char *external_diff_cmd_cfg;
aecbf914 27int diff_auto_refresh_index = 1;
a5a818ee 28static int diff_mnemonic_prefix;
6973dcae 29
7c92fe0e 30static char diff_colors[][COLOR_MAXLEN] = {
f37399e6 31 "\033[m", /* reset */
448c3ef1
JH
32 "", /* PLAIN (normal) */
33 "\033[1m", /* METAINFO (bold) */
34 "\033[36m", /* FRAGINFO (cyan) */
35 "\033[31m", /* OLD (red) */
36 "\033[32m", /* NEW (green) */
37 "\033[33m", /* COMMIT (yellow) */
38 "\033[41m", /* WHITESPACE (red background) */
cd112cef
JS
39};
40
9cb92c39
JK
41static void diff_filespec_load_driver(struct diff_filespec *one);
42static char *run_textconv(const char *, struct diff_filespec *, size_t *);
43
801235c5
JH
44static int parse_diff_color_slot(const char *var, int ofs)
45{
46 if (!strcasecmp(var+ofs, "plain"))
47 return DIFF_PLAIN;
48 if (!strcasecmp(var+ofs, "meta"))
49 return DIFF_METAINFO;
50 if (!strcasecmp(var+ofs, "frag"))
51 return DIFF_FRAGINFO;
52 if (!strcasecmp(var+ofs, "old"))
53 return DIFF_FILE_OLD;
54 if (!strcasecmp(var+ofs, "new"))
55 return DIFF_FILE_NEW;
ce436973
JK
56 if (!strcasecmp(var+ofs, "commit"))
57 return DIFF_COMMIT;
448c3ef1
JH
58 if (!strcasecmp(var+ofs, "whitespace"))
59 return DIFF_WHITESPACE;
801235c5
JH
60 die("bad config variable '%s'", var);
61}
62
83ad63cf
JH
63/*
64 * These are to give UI layer defaults.
65 * The core-level commands such as git-diff-files should
66 * never be affected by the setting of diff.renames
67 * the user happens to have in the configuration file.
68 */
ef90d6d4 69int git_diff_ui_config(const char *var, const char *value, void *cb)
801235c5 70{
a159ca0c 71 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
0f6f5a40 72 diff_use_color_default = git_config_colorbool(var, value, -1);
801235c5
JH
73 return 0;
74 }
b68ea12e
EW
75 if (!strcmp(var, "diff.renames")) {
76 if (!value)
77 diff_detect_rename_default = DIFF_DETECT_RENAME;
78 else if (!strcasecmp(value, "copies") ||
79 !strcasecmp(value, "copy"))
80 diff_detect_rename_default = DIFF_DETECT_COPY;
81 else if (git_config_bool(var,value))
82 diff_detect_rename_default = DIFF_DETECT_RENAME;
83 return 0;
84 }
aecbf914
JH
85 if (!strcmp(var, "diff.autorefreshindex")) {
86 diff_auto_refresh_index = git_config_bool(var, value);
87 return 0;
88 }
a5a818ee
JH
89 if (!strcmp(var, "diff.mnemonicprefix")) {
90 diff_mnemonic_prefix = git_config_bool(var, value);
91 return 0;
92 }
daec808c
BH
93 if (!strcmp(var, "diff.external"))
94 return git_config_string(&external_diff_cmd_cfg, var, value);
f1af60bd 95
ef90d6d4 96 return git_diff_basic_config(var, value, cb);
9a1805a8
JK
97}
98
ef90d6d4 99int git_diff_basic_config(const char *var, const char *value, void *cb)
9a1805a8 100{
2b6ca6df
LT
101 if (!strcmp(var, "diff.renamelimit")) {
102 diff_rename_limit_default = git_config_int(var, value);
103 return 0;
104 }
105
c7534ef4
JK
106 switch (userdiff_config(var, value)) {
107 case 0: break;
108 case -1: return -1;
109 default: return 0;
110 }
111
1968d77d 112 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
801235c5 113 int slot = parse_diff_color_slot(var, 11);
64f30e94
JH
114 if (!value)
115 return config_error_nonbool(var);
7c92fe0e 116 color_parse(value, var, diff_colors[slot]);
801235c5
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117 return 0;
118 }
f1af60bd 119
a624eaa7
JM
120 /* like GNU diff's --suppress-blank-empty option */
121 if (!strcmp(var, "diff.suppress-blank-empty")) {
122 diff_suppress_blank_empty = git_config_bool(var, value);
123 return 0;
124 }
125
ef90d6d4 126 return git_color_default_config(var, value, cb);
801235c5
JH
127}
128
6973dcae
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129static char *quote_two(const char *one, const char *two)
130{
131 int need_one = quote_c_style(one, NULL, NULL, 1);
132 int need_two = quote_c_style(two, NULL, NULL, 1);
f285a2d7 133 struct strbuf res = STRBUF_INIT;
6973dcae
JH
134
135 if (need_one + need_two) {
663af342
PH
136 strbuf_addch(&res, '"');
137 quote_c_style(one, &res, NULL, 1);
138 quote_c_style(two, &res, NULL, 1);
139 strbuf_addch(&res, '"');
140 } else {
141 strbuf_addstr(&res, one);
142 strbuf_addstr(&res, two);
6973dcae 143 }
b315c5c0 144 return strbuf_detach(&res, NULL);
6973dcae
JH
145}
146
147static const char *external_diff(void)
148{
149 static const char *external_diff_cmd = NULL;
150 static int done_preparing = 0;
151
152 if (done_preparing)
153 return external_diff_cmd;
154 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
cbe02100
JS
155 if (!external_diff_cmd)
156 external_diff_cmd = external_diff_cmd_cfg;
6973dcae
JH
157 done_preparing = 1;
158 return external_diff_cmd;
159}
160
6973dcae
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161static struct diff_tempfile {
162 const char *name; /* filename external diff should read from */
163 char hex[41];
164 char mode[10];
1472966c 165 char tmp_path[PATH_MAX];
6973dcae
JH
166} diff_temp[2];
167
168static int count_lines(const char *data, int size)
169{
170 int count, ch, completely_empty = 1, nl_just_seen = 0;
171 count = 0;
172 while (0 < size--) {
173 ch = *data++;
174 if (ch == '\n') {
175 count++;
176 nl_just_seen = 1;
177 completely_empty = 0;
178 }
179 else {
180 nl_just_seen = 0;
181 completely_empty = 0;
182 }
183 }
184 if (completely_empty)
185 return 0;
186 if (!nl_just_seen)
187 count++; /* no trailing newline */
188 return count;
189}
190
c0c77734 191static void print_line_count(FILE *file, int count)
6973dcae
JH
192{
193 switch (count) {
194 case 0:
c0c77734 195 fprintf(file, "0,0");
6973dcae
JH
196 break;
197 case 1:
c0c77734 198 fprintf(file, "1");
6973dcae
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199 break;
200 default:
c0c77734 201 fprintf(file, "1,%d", count);
6973dcae
JH
202 break;
203 }
204}
205
c0c77734
DB
206static void copy_file_with_prefix(FILE *file,
207 int prefix, const char *data, int size,
1468bd47 208 const char *set, const char *reset)
6973dcae
JH
209{
210 int ch, nl_just_seen = 1;
211 while (0 < size--) {
212 ch = *data++;
13e36ec5 213 if (nl_just_seen) {
c0c77734
DB
214 fputs(set, file);
215 putc(prefix, file);
13e36ec5
JS
216 }
217 if (ch == '\n') {
6973dcae 218 nl_just_seen = 1;
c0c77734 219 fputs(reset, file);
13e36ec5 220 } else
6973dcae 221 nl_just_seen = 0;
c0c77734 222 putc(ch, file);
6973dcae
JH
223 }
224 if (!nl_just_seen)
c0c77734 225 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
6973dcae
JH
226}
227
228static void emit_rewrite_diff(const char *name_a,
229 const char *name_b,
230 struct diff_filespec *one,
13e36ec5 231 struct diff_filespec *two,
3aa1f7ca
JK
232 const char *textconv_one,
233 const char *textconv_two,
eab9a40b 234 struct diff_options *o)
6973dcae
JH
235{
236 int lc_a, lc_b;
eab9a40b 237 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1a9eb3b9 238 const char *name_a_tab, *name_b_tab;
13e36ec5
JS
239 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
240 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
241 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
242 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
243 const char *reset = diff_get_color(color_diff, DIFF_RESET);
d5625091 244 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
a5a818ee 245 const char *a_prefix, *b_prefix;
3aa1f7ca
JK
246 const char *data_one, *data_two;
247 size_t size_one, size_two;
a5a818ee
JH
248
249 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
250 a_prefix = o->b_prefix;
251 b_prefix = o->a_prefix;
252 } else {
253 a_prefix = o->a_prefix;
254 b_prefix = o->b_prefix;
255 }
1a9eb3b9 256
8a13becc
JH
257 name_a += (*name_a == '/');
258 name_b += (*name_b == '/');
1a9eb3b9
JH
259 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
260 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
261
d5625091
JH
262 strbuf_reset(&a_name);
263 strbuf_reset(&b_name);
a5a818ee
JH
264 quote_two_c_style(&a_name, a_prefix, name_a, 0);
265 quote_two_c_style(&b_name, b_prefix, name_b, 0);
d5625091 266
6973dcae
JH
267 diff_populate_filespec(one, 0);
268 diff_populate_filespec(two, 0);
3aa1f7ca
JK
269 if (textconv_one) {
270 data_one = run_textconv(textconv_one, one, &size_one);
271 if (!data_one)
272 die("unable to read files to diff");
273 }
274 else {
275 data_one = one->data;
276 size_one = one->size;
277 }
278 if (textconv_two) {
279 data_two = run_textconv(textconv_two, two, &size_two);
280 if (!data_two)
281 die("unable to read files to diff");
282 }
283 else {
284 data_two = two->data;
285 size_two = two->size;
286 }
287
288 lc_a = count_lines(data_one, size_one);
289 lc_b = count_lines(data_two, size_two);
c0c77734
DB
290 fprintf(o->file,
291 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
292 metainfo, a_name.buf, name_a_tab, reset,
293 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
294 print_line_count(o->file, lc_a);
295 fprintf(o->file, " +");
296 print_line_count(o->file, lc_b);
297 fprintf(o->file, " @@%s\n", reset);
6973dcae 298 if (lc_a)
3aa1f7ca 299 copy_file_with_prefix(o->file, '-', data_one, size_one, old, reset);
6973dcae 300 if (lc_b)
3aa1f7ca 301 copy_file_with_prefix(o->file, '+', data_two, size_two, new, reset);
6973dcae
JH
302}
303
304static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
305{
306 if (!DIFF_FILE_VALID(one)) {
d2543b8e 307 mf->ptr = (char *)""; /* does not matter */
6973dcae
JH
308 mf->size = 0;
309 return 0;
310 }
311 else if (diff_populate_filespec(one, 0))
312 return -1;
9cb92c39 313
04427ac8
JK
314 mf->ptr = one->data;
315 mf->size = one->size;
6973dcae
JH
316 return 0;
317}
318
f59a59e2
JS
319struct diff_words_buffer {
320 mmfile_t text;
321 long alloc;
322 long current; /* output pointer */
323 int suppressed_newline;
324};
325
326static void diff_words_append(char *line, unsigned long len,
327 struct diff_words_buffer *buffer)
328{
329 if (buffer->text.size + len > buffer->alloc) {
330 buffer->alloc = (buffer->text.size + len) * 3 / 2;
331 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
332 }
333 line++;
334 len--;
335 memcpy(buffer->text.ptr + buffer->text.size, line, len);
336 buffer->text.size += len;
337}
338
339struct diff_words_data {
f59a59e2 340 struct diff_words_buffer minus, plus;
c0c77734 341 FILE *file;
f59a59e2
JS
342};
343
c0c77734 344static void print_word(FILE *file, struct diff_words_buffer *buffer, int len, int color,
f59a59e2
JS
345 int suppress_newline)
346{
347 const char *ptr;
348 int eol = 0;
349
350 if (len == 0)
351 return;
352
353 ptr = buffer->text.ptr + buffer->current;
354 buffer->current += len;
355
356 if (ptr[len - 1] == '\n') {
357 eol = 1;
358 len--;
359 }
360
c0c77734
DB
361 fputs(diff_get_color(1, color), file);
362 fwrite(ptr, len, 1, file);
363 fputs(diff_get_color(1, DIFF_RESET), file);
f59a59e2
JS
364
365 if (eol) {
366 if (suppress_newline)
367 buffer->suppressed_newline = 1;
368 else
c0c77734 369 putc('\n', file);
f59a59e2
JS
370 }
371}
372
373static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
374{
375 struct diff_words_data *diff_words = priv;
376
377 if (diff_words->minus.suppressed_newline) {
378 if (line[0] != '+')
c0c77734 379 putc('\n', diff_words->file);
f59a59e2
JS
380 diff_words->minus.suppressed_newline = 0;
381 }
382
383 len--;
384 switch (line[0]) {
385 case '-':
c0c77734
DB
386 print_word(diff_words->file,
387 &diff_words->minus, len, DIFF_FILE_OLD, 1);
f59a59e2
JS
388 break;
389 case '+':
c0c77734
DB
390 print_word(diff_words->file,
391 &diff_words->plus, len, DIFF_FILE_NEW, 0);
f59a59e2
JS
392 break;
393 case ' ':
c0c77734
DB
394 print_word(diff_words->file,
395 &diff_words->plus, len, DIFF_PLAIN, 0);
f59a59e2
JS
396 diff_words->minus.current += len;
397 break;
398 }
399}
400
401/* this executes the word diff on the accumulated buffers */
402static void diff_words_show(struct diff_words_data *diff_words)
403{
404 xpparam_t xpp;
405 xdemitconf_t xecfg;
406 xdemitcb_t ecb;
407 mmfile_t minus, plus;
408 int i;
409
9ccd0a88 410 memset(&xpp, 0, sizeof(xpp));
30b25010 411 memset(&xecfg, 0, sizeof(xecfg));
f59a59e2
JS
412 minus.size = diff_words->minus.text.size;
413 minus.ptr = xmalloc(minus.size);
414 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
415 for (i = 0; i < minus.size; i++)
416 if (isspace(minus.ptr[i]))
417 minus.ptr[i] = '\n';
418 diff_words->minus.current = 0;
419
420 plus.size = diff_words->plus.text.size;
421 plus.ptr = xmalloc(plus.size);
422 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
423 for (i = 0; i < plus.size; i++)
424 if (isspace(plus.ptr[i]))
425 plus.ptr[i] = '\n';
426 diff_words->plus.current = 0;
427
428 xpp.flags = XDF_NEED_MINIMAL;
429 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
8a3f524b
JH
430 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
431 &xpp, &xecfg, &ecb);
f59a59e2
JS
432 free(minus.ptr);
433 free(plus.ptr);
434 diff_words->minus.text.size = diff_words->plus.text.size = 0;
435
436 if (diff_words->minus.suppressed_newline) {
c0c77734 437 putc('\n', diff_words->file);
f59a59e2
JS
438 diff_words->minus.suppressed_newline = 0;
439 }
440}
441
23707811
JH
442typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
443
6973dcae 444struct emit_callback {
cd112cef 445 int nparents, color_diff;
cf1b7869 446 unsigned ws_rule;
23707811 447 sane_truncate_fn truncate;
6973dcae 448 const char **label_path;
f59a59e2 449 struct diff_words_data *diff_words;
34a5e1a2 450 int *found_changesp;
c0c77734 451 FILE *file;
6973dcae
JH
452};
453
f59a59e2
JS
454static void free_diff_words_data(struct emit_callback *ecbdata)
455{
456 if (ecbdata->diff_words) {
457 /* flush buffers */
458 if (ecbdata->diff_words->minus.text.size ||
459 ecbdata->diff_words->plus.text.size)
460 diff_words_show(ecbdata->diff_words);
461
8e0f7003
JM
462 free (ecbdata->diff_words->minus.text.ptr);
463 free (ecbdata->diff_words->plus.text.ptr);
f59a59e2
JS
464 free(ecbdata->diff_words);
465 ecbdata->diff_words = NULL;
466 }
467}
468
ce436973 469const char *diff_get_color(int diff_use_color, enum color_diff ix)
cd112cef
JS
470{
471 if (diff_use_color)
50f575fc
LT
472 return diff_colors[ix];
473 return "";
cd112cef
JS
474}
475
c0c77734 476static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
448c3ef1 477{
39280970
JH
478 int has_trailing_newline, has_trailing_carriage_return;
479
480 has_trailing_newline = (len > 0 && line[len-1] == '\n');
4afbcab9 481 if (has_trailing_newline)
06ff64ae 482 len--;
39280970
JH
483 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
484 if (has_trailing_carriage_return)
485 len--;
06ff64ae 486
c0c77734
DB
487 fputs(set, file);
488 fwrite(line, len, 1, file);
489 fputs(reset, file);
39280970
JH
490 if (has_trailing_carriage_return)
491 fputc('\r', file);
4afbcab9
JH
492 if (has_trailing_newline)
493 fputc('\n', file);
448c3ef1
JH
494}
495
c5a8c3ec
JS
496static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
497{
498 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
499 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
500
501 if (!*ws)
c0c77734 502 emit_line(ecbdata->file, set, reset, line, len);
c1795bb0
WC
503 else {
504 /* Emit just the prefix, then the rest. */
c0c77734 505 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
8f8841e9
JH
506 ws_check_emit(line + ecbdata->nparents,
507 len - ecbdata->nparents, ecbdata->ws_rule,
508 ecbdata->file, set, reset, ws);
c1795bb0 509 }
c5a8c3ec
JS
510}
511
23707811
JH
512static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
513{
514 const char *cp;
515 unsigned long allot;
516 size_t l = len;
517
518 if (ecb->truncate)
519 return ecb->truncate(line, len);
520 cp = line;
521 allot = l;
522 while (0 < l) {
523 (void) utf8_width(&cp, &l);
524 if (!cp)
525 break; /* truncated in the middle? */
526 }
527 return allot - l;
528}
529
cd112cef 530static void fn_out_consume(void *priv, char *line, unsigned long len)
6973dcae
JH
531{
532 int i;
448c3ef1 533 int color;
6973dcae 534 struct emit_callback *ecbdata = priv;
472ca780
JK
535 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
536 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
ce436973 537 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
6973dcae 538
34a5e1a2
JS
539 *(ecbdata->found_changesp) = 1;
540
6973dcae 541 if (ecbdata->label_path[0]) {
1a9eb3b9
JH
542 const char *name_a_tab, *name_b_tab;
543
544 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
545 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
546
c0c77734
DB
547 fprintf(ecbdata->file, "%s--- %s%s%s\n",
548 meta, ecbdata->label_path[0], reset, name_a_tab);
549 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
550 meta, ecbdata->label_path[1], reset, name_b_tab);
6973dcae
JH
551 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
552 }
cd112cef 553
a624eaa7
JM
554 if (diff_suppress_blank_empty
555 && len == 2 && line[0] == ' ' && line[1] == '\n') {
556 line[0] = '\n';
557 len = 1;
558 }
559
cd112cef
JS
560 /* This is not really necessary for now because
561 * this codepath only deals with two-way diffs.
562 */
563 for (i = 0; i < len && line[i] == '@'; i++)
564 ;
565 if (2 <= i && i < len && line[i] == ' ') {
566 ecbdata->nparents = i - 1;
23707811 567 len = sane_truncate_line(ecbdata, line, len);
c0c77734
DB
568 emit_line(ecbdata->file,
569 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
448c3ef1 570 reset, line, len);
23707811 571 if (line[len-1] != '\n')
c0c77734 572 putc('\n', ecbdata->file);
448c3ef1 573 return;
cd112cef 574 }
448c3ef1
JH
575
576 if (len < ecbdata->nparents) {
c0c77734 577 emit_line(ecbdata->file, reset, reset, line, len);
448c3ef1 578 return;
cd112cef 579 }
448c3ef1
JH
580
581 color = DIFF_PLAIN;
582 if (ecbdata->diff_words && ecbdata->nparents != 1)
583 /* fall back to normal diff */
584 free_diff_words_data(ecbdata);
585 if (ecbdata->diff_words) {
586 if (line[0] == '-') {
587 diff_words_append(line, len,
588 &ecbdata->diff_words->minus);
589 return;
590 } else if (line[0] == '+') {
591 diff_words_append(line, len,
592 &ecbdata->diff_words->plus);
593 return;
594 }
595 if (ecbdata->diff_words->minus.text.size ||
596 ecbdata->diff_words->plus.text.size)
597 diff_words_show(ecbdata->diff_words);
598 line++;
50f575fc 599 len--;
c0c77734 600 emit_line(ecbdata->file, plain, reset, line, len);
448c3ef1
JH
601 return;
602 }
603 for (i = 0; i < ecbdata->nparents && len; i++) {
604 if (line[i] == '-')
605 color = DIFF_FILE_OLD;
606 else if (line[i] == '+')
607 color = DIFF_FILE_NEW;
608 }
609
610 if (color != DIFF_FILE_NEW) {
c0c77734
DB
611 emit_line(ecbdata->file,
612 diff_get_color(ecbdata->color_diff, color),
448c3ef1
JH
613 reset, line, len);
614 return;
615 }
616 emit_add_line(reset, ecbdata, line, len);
6973dcae
JH
617}
618
619static char *pprint_rename(const char *a, const char *b)
620{
621 const char *old = a;
622 const char *new = b;
f285a2d7 623 struct strbuf name = STRBUF_INIT;
6973dcae
JH
624 int pfx_length, sfx_length;
625 int len_a = strlen(a);
626 int len_b = strlen(b);
663af342 627 int a_midlen, b_midlen;
e5bfbf9b
AJ
628 int qlen_a = quote_c_style(a, NULL, NULL, 0);
629 int qlen_b = quote_c_style(b, NULL, NULL, 0);
630
631 if (qlen_a || qlen_b) {
663af342
PH
632 quote_c_style(a, &name, NULL, 0);
633 strbuf_addstr(&name, " => ");
634 quote_c_style(b, &name, NULL, 0);
b315c5c0 635 return strbuf_detach(&name, NULL);
e5bfbf9b 636 }
6973dcae
JH
637
638 /* Find common prefix */
639 pfx_length = 0;
640 while (*old && *new && *old == *new) {
641 if (*old == '/')
642 pfx_length = old - a + 1;
643 old++;
644 new++;
645 }
646
647 /* Find common suffix */
648 old = a + len_a;
649 new = b + len_b;
650 sfx_length = 0;
651 while (a <= old && b <= new && *old == *new) {
652 if (*old == '/')
653 sfx_length = len_a - (old - a);
654 old--;
655 new--;
656 }
657
658 /*
659 * pfx{mid-a => mid-b}sfx
660 * {pfx-a => pfx-b}sfx
661 * pfx{sfx-a => sfx-b}
662 * name-a => name-b
663 */
663af342
PH
664 a_midlen = len_a - pfx_length - sfx_length;
665 b_midlen = len_b - pfx_length - sfx_length;
666 if (a_midlen < 0)
667 a_midlen = 0;
668 if (b_midlen < 0)
669 b_midlen = 0;
670
671 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
6973dcae 672 if (pfx_length + sfx_length) {
663af342
PH
673 strbuf_add(&name, a, pfx_length);
674 strbuf_addch(&name, '{');
6973dcae 675 }
663af342
PH
676 strbuf_add(&name, a + pfx_length, a_midlen);
677 strbuf_addstr(&name, " => ");
678 strbuf_add(&name, b + pfx_length, b_midlen);
679 if (pfx_length + sfx_length) {
680 strbuf_addch(&name, '}');
681 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
6973dcae 682 }
b315c5c0 683 return strbuf_detach(&name, NULL);
6973dcae
JH
684}
685
686struct diffstat_t {
6973dcae
JH
687 int nr;
688 int alloc;
689 struct diffstat_file {
f604652e 690 char *from_name;
6973dcae 691 char *name;
f604652e 692 char *print_name;
6973dcae
JH
693 unsigned is_unmerged:1;
694 unsigned is_binary:1;
695 unsigned is_renamed:1;
696 unsigned int added, deleted;
697 } **files;
698};
699
700static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
701 const char *name_a,
702 const char *name_b)
703{
704 struct diffstat_file *x;
705 x = xcalloc(sizeof (*x), 1);
706 if (diffstat->nr == diffstat->alloc) {
707 diffstat->alloc = alloc_nr(diffstat->alloc);
708 diffstat->files = xrealloc(diffstat->files,
709 diffstat->alloc * sizeof(x));
710 }
711 diffstat->files[diffstat->nr++] = x;
712 if (name_b) {
f604652e
JH
713 x->from_name = xstrdup(name_a);
714 x->name = xstrdup(name_b);
6973dcae
JH
715 x->is_renamed = 1;
716 }
f604652e
JH
717 else {
718 x->from_name = NULL;
9befac47 719 x->name = xstrdup(name_a);
f604652e 720 }
6973dcae
JH
721 return x;
722}
723
724static void diffstat_consume(void *priv, char *line, unsigned long len)
725{
726 struct diffstat_t *diffstat = priv;
727 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
728
729 if (line[0] == '+')
730 x->added++;
731 else if (line[0] == '-')
732 x->deleted++;
733}
734
698ce6f8 735const char mime_boundary_leader[] = "------------";
6973dcae 736
a2540023
JH
737static int scale_linear(int it, int width, int max_change)
738{
739 /*
3ed74e60
JS
740 * make sure that at least one '-' is printed if there were deletions,
741 * and likewise for '+'.
a2540023 742 */
3ed74e60
JS
743 if (max_change < 2)
744 return it;
745 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
a2540023
JH
746}
747
c0c77734
DB
748static void show_name(FILE *file,
749 const char *prefix, const char *name, int len,
785f7432 750 const char *reset, const char *set)
a2540023 751{
c0c77734 752 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
a2540023
JH
753}
754
c0c77734 755static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
a2540023
JH
756{
757 if (cnt <= 0)
758 return;
c0c77734 759 fprintf(file, "%s", set);
a2540023 760 while (cnt--)
c0c77734
DB
761 putc(ch, file);
762 fprintf(file, "%s", reset);
a2540023
JH
763}
764
f604652e
JH
765static void fill_print_name(struct diffstat_file *file)
766{
767 char *pname;
768
769 if (file->print_name)
770 return;
771
772 if (!file->is_renamed) {
f285a2d7 773 struct strbuf buf = STRBUF_INIT;
f604652e
JH
774 if (quote_c_style(file->name, &buf, NULL, 0)) {
775 pname = strbuf_detach(&buf, NULL);
776 } else {
777 pname = file->name;
778 strbuf_release(&buf);
779 }
780 } else {
781 pname = pprint_rename(file->from_name, file->name);
782 }
783 file->print_name = pname;
784}
785
a2540023 786static void show_stats(struct diffstat_t* data, struct diff_options *options)
6973dcae 787{
6973dcae 788 int i, len, add, del, total, adds = 0, dels = 0;
a2540023 789 int max_change = 0, max_len = 0;
6973dcae 790 int total_files = data->nr;
a2540023 791 int width, name_width;
785f7432 792 const char *reset, *set, *add_c, *del_c;
6973dcae
JH
793
794 if (data->nr == 0)
795 return;
796
a2540023
JH
797 width = options->stat_width ? options->stat_width : 80;
798 name_width = options->stat_name_width ? options->stat_name_width : 50;
799
800 /* Sanity: give at least 5 columns to the graph,
801 * but leave at least 10 columns for the name.
802 */
861d1af3
OM
803 if (width < 25)
804 width = 25;
805 if (name_width < 10)
806 name_width = 10;
807 else if (width < name_width + 15)
808 name_width = width - 15;
a2540023
JH
809
810 /* Find the longest filename and max number of changes */
8f67f8ae
PH
811 reset = diff_get_color_opt(options, DIFF_RESET);
812 set = diff_get_color_opt(options, DIFF_PLAIN);
813 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
814 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
785f7432 815
6973dcae
JH
816 for (i = 0; i < data->nr; i++) {
817 struct diffstat_file *file = data->files[i];
a2540023 818 int change = file->added + file->deleted;
f604652e
JH
819 fill_print_name(file);
820 len = strlen(file->print_name);
6973dcae
JH
821 if (max_len < len)
822 max_len = len;
823
824 if (file->is_binary || file->is_unmerged)
825 continue;
a2540023
JH
826 if (max_change < change)
827 max_change = change;
6973dcae
JH
828 }
829
a2540023
JH
830 /* Compute the width of the graph part;
831 * 10 is for one blank at the beginning of the line plus
832 * " | count " between the name and the graph.
833 *
834 * From here on, name_width is the width of the name area,
835 * and width is the width of the graph area.
836 */
837 name_width = (name_width < max_len) ? name_width : max_len;
838 if (width < (name_width + 10) + max_change)
839 width = width - (name_width + 10);
840 else
841 width = max_change;
842
6973dcae 843 for (i = 0; i < data->nr; i++) {
d2543b8e 844 const char *prefix = "";
f604652e 845 char *name = data->files[i]->print_name;
6973dcae
JH
846 int added = data->files[i]->added;
847 int deleted = data->files[i]->deleted;
a2540023 848 int name_len;
6973dcae
JH
849
850 /*
851 * "scale" the filename
852 */
a2540023
JH
853 len = name_width;
854 name_len = strlen(name);
855 if (name_width < name_len) {
6973dcae
JH
856 char *slash;
857 prefix = "...";
a2540023
JH
858 len -= 3;
859 name += name_len - len;
6973dcae
JH
860 slash = strchr(name, '/');
861 if (slash)
862 name = slash;
863 }
6973dcae
JH
864
865 if (data->files[i]->is_binary) {
c0c77734
DB
866 show_name(options->file, prefix, name, len, reset, set);
867 fprintf(options->file, " Bin ");
868 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
869 fprintf(options->file, " -> ");
870 fprintf(options->file, "%s%d%s", add_c, added, reset);
871 fprintf(options->file, " bytes");
872 fprintf(options->file, "\n");
f604652e 873 continue;
6973dcae
JH
874 }
875 else if (data->files[i]->is_unmerged) {
c0c77734
DB
876 show_name(options->file, prefix, name, len, reset, set);
877 fprintf(options->file, " Unmerged\n");
f604652e 878 continue;
6973dcae
JH
879 }
880 else if (!data->files[i]->is_renamed &&
881 (added + deleted == 0)) {
882 total_files--;
f604652e 883 continue;
6973dcae
JH
884 }
885
a2540023
JH
886 /*
887 * scale the add/delete
888 */
6973dcae
JH
889 add = added;
890 del = deleted;
891 total = add + del;
892 adds += add;
893 dels += del;
894
a2540023 895 if (width <= max_change) {
a2540023 896 add = scale_linear(add, width, max_change);
3ed74e60
JS
897 del = scale_linear(del, width, max_change);
898 total = add + del;
6973dcae 899 }
c0c77734 900 show_name(options->file, prefix, name, len, reset, set);
4d9b5359
JK
901 fprintf(options->file, "%5d%s", added + deleted,
902 added + deleted ? " " : "");
c0c77734
DB
903 show_graph(options->file, '+', add, add_c, reset);
904 show_graph(options->file, '-', del, del_c, reset);
905 fprintf(options->file, "\n");
906 }
907 fprintf(options->file,
908 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
785f7432 909 set, total_files, adds, dels, reset);
6973dcae
JH
910}
911
c0c77734 912static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
ebd124c6
NP
913{
914 int i, adds = 0, dels = 0, total_files = data->nr;
915
916 if (data->nr == 0)
917 return;
918
919 for (i = 0; i < data->nr; i++) {
920 if (!data->files[i]->is_binary &&
921 !data->files[i]->is_unmerged) {
922 int added = data->files[i]->added;
923 int deleted= data->files[i]->deleted;
924 if (!data->files[i]->is_renamed &&
925 (added + deleted == 0)) {
926 total_files--;
927 } else {
928 adds += added;
929 dels += deleted;
930 }
931 }
ebd124c6 932 }
c0c77734 933 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
ebd124c6
NP
934 total_files, adds, dels);
935}
936
74e2abe5
JH
937static void show_numstat(struct diffstat_t* data, struct diff_options *options)
938{
939 int i;
940
f604652e
JH
941 if (data->nr == 0)
942 return;
943
74e2abe5
JH
944 for (i = 0; i < data->nr; i++) {
945 struct diffstat_file *file = data->files[i];
946
bfddbc5e 947 if (file->is_binary)
c0c77734 948 fprintf(options->file, "-\t-\t");
bfddbc5e 949 else
c0c77734
DB
950 fprintf(options->file,
951 "%d\t%d\t", file->added, file->deleted);
f604652e
JH
952 if (options->line_termination) {
953 fill_print_name(file);
954 if (!file->is_renamed)
c0c77734 955 write_name_quoted(file->name, options->file,
f604652e
JH
956 options->line_termination);
957 else {
c0c77734
DB
958 fputs(file->print_name, options->file);
959 putc(options->line_termination, options->file);
f604652e 960 }
663af342 961 } else {
f604652e 962 if (file->is_renamed) {
c0c77734
DB
963 putc('\0', options->file);
964 write_name_quoted(file->from_name, options->file, '\0');
f604652e 965 }
c0c77734 966 write_name_quoted(file->name, options->file, '\0');
663af342 967 }
74e2abe5
JH
968 }
969}
970
c04a7155
JH
971struct dirstat_file {
972 const char *name;
973 unsigned long changed;
7df7c019
LT
974};
975
c04a7155
JH
976struct dirstat_dir {
977 struct dirstat_file *files;
978 int alloc, nr, percent, cumulative;
979};
980
981static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
7df7c019
LT
982{
983 unsigned long this_dir = 0;
984 unsigned int sources = 0;
985
986 while (dir->nr) {
c04a7155 987 struct dirstat_file *f = dir->files;
7df7c019
LT
988 int namelen = strlen(f->name);
989 unsigned long this;
990 char *slash;
991
992 if (namelen < baselen)
993 break;
994 if (memcmp(f->name, base, baselen))
995 break;
996 slash = strchr(f->name + baselen, '/');
997 if (slash) {
998 int newbaselen = slash + 1 - f->name;
c0c77734 999 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
7df7c019
LT
1000 sources++;
1001 } else {
c04a7155 1002 this = f->changed;
7df7c019
LT
1003 dir->files++;
1004 dir->nr--;
1005 sources += 2;
1006 }
1007 this_dir += this;
1008 }
1009
1010 /*
1011 * We don't report dirstat's for
1012 * - the top level
1013 * - or cases where everything came from a single directory
1014 * under this directory (sources == 1).
1015 */
1016 if (baselen && sources != 1) {
1017 int permille = this_dir * 1000 / changed;
1018 if (permille) {
1019 int percent = permille / 10;
1020 if (percent >= dir->percent) {
c0c77734 1021 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
7df7c019
LT
1022 if (!dir->cumulative)
1023 return 0;
1024 }
1025 }
1026 }
1027 return this_dir;
1028}
1029
441bca0b
LT
1030static int dirstat_compare(const void *_a, const void *_b)
1031{
1032 const struct dirstat_file *a = _a;
1033 const struct dirstat_file *b = _b;
1034 return strcmp(a->name, b->name);
1035}
1036
c04a7155 1037static void show_dirstat(struct diff_options *options)
7df7c019
LT
1038{
1039 int i;
1040 unsigned long changed;
c04a7155
JH
1041 struct dirstat_dir dir;
1042 struct diff_queue_struct *q = &diff_queued_diff;
1043
1044 dir.files = NULL;
1045 dir.alloc = 0;
1046 dir.nr = 0;
1047 dir.percent = options->dirstat_percent;
f88d225f 1048 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
7df7c019 1049
7df7c019 1050 changed = 0;
c04a7155
JH
1051 for (i = 0; i < q->nr; i++) {
1052 struct diff_filepair *p = q->queue[i];
1053 const char *name;
1054 unsigned long copied, added, damage;
1055
1056 name = p->one->path ? p->one->path : p->two->path;
1057
1058 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1059 diff_populate_filespec(p->one, 0);
1060 diff_populate_filespec(p->two, 0);
1061 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1062 &copied, &added);
1063 diff_free_filespec_data(p->one);
1064 diff_free_filespec_data(p->two);
1065 } else if (DIFF_FILE_VALID(p->one)) {
1066 diff_populate_filespec(p->one, 1);
1067 copied = added = 0;
1068 diff_free_filespec_data(p->one);
1069 } else if (DIFF_FILE_VALID(p->two)) {
1070 diff_populate_filespec(p->two, 1);
1071 copied = 0;
1072 added = p->two->size;
1073 diff_free_filespec_data(p->two);
1074 } else
2b0b551d 1075 continue;
c04a7155
JH
1076
1077 /*
1078 * Original minus copied is the removed material,
1079 * added is the new material. They are both damages
fd33777b
HO
1080 * made to the preimage. In --dirstat-by-file mode, count
1081 * damaged files, not damaged lines. This is done by
1082 * counting only a single damaged line per file.
c04a7155
JH
1083 */
1084 damage = (p->one->size - copied) + added;
fd33777b
HO
1085 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1086 damage = 1;
c04a7155
JH
1087
1088 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1089 dir.files[dir.nr].name = name;
1090 dir.files[dir.nr].changed = damage;
1091 changed += damage;
1092 dir.nr++;
7df7c019
LT
1093 }
1094
1095 /* This can happen even with many files, if everything was renames */
1096 if (!changed)
1097 return;
1098
1099 /* Show all directories with more than x% of the changes */
441bca0b 1100 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
c0c77734 1101 gather_dirstat(options->file, &dir, changed, "", 0);
7df7c019
LT
1102}
1103
f604652e
JH
1104static void free_diffstat_info(struct diffstat_t *diffstat)
1105{
1106 int i;
1107 for (i = 0; i < diffstat->nr; i++) {
1108 struct diffstat_file *f = diffstat->files[i];
1109 if (f->name != f->print_name)
1110 free(f->print_name);
1111 free(f->name);
1112 free(f->from_name);
1113 free(f);
1114 }
1115 free(diffstat->files);
1116}
1117
88246898 1118struct checkdiff_t {
88246898 1119 const char *filename;
1ba111d1
JH
1120 int lineno;
1121 struct diff_options *o;
cf1b7869 1122 unsigned ws_rule;
62c64895 1123 unsigned status;
877f23cc 1124 int trailing_blanks_start;
88246898
JS
1125};
1126
04954043
JH
1127static int is_conflict_marker(const char *line, unsigned long len)
1128{
1129 char firstchar;
1130 int cnt;
1131
1132 if (len < 8)
1133 return 0;
1134 firstchar = line[0];
1135 switch (firstchar) {
1136 case '=': case '>': case '<':
1137 break;
1138 default:
1139 return 0;
1140 }
1141 for (cnt = 1; cnt < 7; cnt++)
1142 if (line[cnt] != firstchar)
1143 return 0;
1144 /* line[0] thru line[6] are same as firstchar */
1145 if (firstchar == '=') {
1146 /* divider between ours and theirs? */
1147 if (len != 8 || line[7] != '\n')
1148 return 0;
1149 } else if (len < 8 || !isspace(line[7])) {
1150 /* not divider before ours nor after theirs */
1151 return 0;
1152 }
1153 return 1;
1154}
1155
88246898
JS
1156static void checkdiff_consume(void *priv, char *line, unsigned long len)
1157{
1158 struct checkdiff_t *data = priv;
1ba111d1
JH
1159 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1160 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1161 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1162 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
c1795bb0 1163 char *err;
88246898
JS
1164
1165 if (line[0] == '+') {
18374e58 1166 unsigned bad;
0ef617f4 1167 data->lineno++;
877f23cc
JH
1168 if (!ws_blank_line(line + 1, len - 1, data->ws_rule))
1169 data->trailing_blanks_start = 0;
1170 else if (!data->trailing_blanks_start)
1171 data->trailing_blanks_start = data->lineno;
04954043
JH
1172 if (is_conflict_marker(line + 1, len - 1)) {
1173 data->status |= 1;
1174 fprintf(data->o->file,
1175 "%s:%d: leftover conflict marker\n",
1176 data->filename, data->lineno);
1177 }
8f8841e9 1178 bad = ws_check(line + 1, len - 1, data->ws_rule);
18374e58 1179 if (!bad)
c1795bb0 1180 return;
18374e58
JH
1181 data->status |= bad;
1182 err = whitespace_error_string(bad);
1ba111d1
JH
1183 fprintf(data->o->file, "%s:%d: %s.\n",
1184 data->filename, data->lineno, err);
c1795bb0 1185 free(err);
1ba111d1 1186 emit_line(data->o->file, set, reset, line, 1);
8f8841e9 1187 ws_check_emit(line + 1, len - 1, data->ws_rule,
1ba111d1 1188 data->o->file, set, reset, ws);
877f23cc 1189 } else if (line[0] == ' ') {
88246898 1190 data->lineno++;
877f23cc
JH
1191 data->trailing_blanks_start = 0;
1192 } else if (line[0] == '@') {
88246898
JS
1193 char *plus = strchr(line, '+');
1194 if (plus)
0ef617f4 1195 data->lineno = strtol(plus, NULL, 10) - 1;
88246898
JS
1196 else
1197 die("invalid diff");
877f23cc 1198 data->trailing_blanks_start = 0;
88246898
JS
1199 }
1200}
1201
0660626c
JH
1202static unsigned char *deflate_it(char *data,
1203 unsigned long size,
1204 unsigned long *result_size)
051308f6 1205{
0660626c
JH
1206 int bound;
1207 unsigned char *deflated;
1208 z_stream stream;
1209
1210 memset(&stream, 0, sizeof(stream));
12f6c308 1211 deflateInit(&stream, zlib_compression_level);
0660626c
JH
1212 bound = deflateBound(&stream, size);
1213 deflated = xmalloc(bound);
1214 stream.next_out = deflated;
1215 stream.avail_out = bound;
1216
1217 stream.next_in = (unsigned char *)data;
1218 stream.avail_in = size;
1219 while (deflate(&stream, Z_FINISH) == Z_OK)
1220 ; /* nothing */
1221 deflateEnd(&stream);
1222 *result_size = stream.total_out;
1223 return deflated;
051308f6
JH
1224}
1225
c0c77734 1226static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
051308f6 1227{
0660626c
JH
1228 void *cp;
1229 void *delta;
1230 void *deflated;
1231 void *data;
1232 unsigned long orig_size;
1233 unsigned long delta_size;
1234 unsigned long deflate_size;
1235 unsigned long data_size;
051308f6 1236
0660626c
JH
1237 /* We could do deflated delta, or we could do just deflated two,
1238 * whichever is smaller.
051308f6 1239 */
0660626c
JH
1240 delta = NULL;
1241 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1242 if (one->size && two->size) {
1243 delta = diff_delta(one->ptr, one->size,
1244 two->ptr, two->size,
1245 &delta_size, deflate_size);
1246 if (delta) {
1247 void *to_free = delta;
1248 orig_size = delta_size;
1249 delta = deflate_it(delta, delta_size, &delta_size);
1250 free(to_free);
051308f6
JH
1251 }
1252 }
051308f6 1253
0660626c 1254 if (delta && delta_size < deflate_size) {
c0c77734 1255 fprintf(file, "delta %lu\n", orig_size);
0660626c
JH
1256 free(deflated);
1257 data = delta;
1258 data_size = delta_size;
1259 }
1260 else {
c0c77734 1261 fprintf(file, "literal %lu\n", two->size);
0660626c
JH
1262 free(delta);
1263 data = deflated;
1264 data_size = deflate_size;
1265 }
051308f6 1266
0660626c
JH
1267 /* emit data encoded in base85 */
1268 cp = data;
1269 while (data_size) {
1270 int bytes = (52 < data_size) ? 52 : data_size;
051308f6 1271 char line[70];
0660626c 1272 data_size -= bytes;
051308f6
JH
1273 if (bytes <= 26)
1274 line[0] = bytes + 'A' - 1;
1275 else
1276 line[0] = bytes - 26 + 'a' - 1;
1277 encode_85(line + 1, cp, bytes);
1d7f171c 1278 cp = (char *) cp + bytes;
c0c77734
DB
1279 fputs(line, file);
1280 fputc('\n', file);
051308f6 1281 }
c0c77734 1282 fprintf(file, "\n");
0660626c 1283 free(data);
051308f6
JH
1284}
1285
c0c77734 1286static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
d4c452f0 1287{
c0c77734
DB
1288 fprintf(file, "GIT binary patch\n");
1289 emit_binary_diff_body(file, one, two);
1290 emit_binary_diff_body(file, two, one);
d4c452f0
JH
1291}
1292
72cf4841 1293static void diff_filespec_load_driver(struct diff_filespec *one)
6973dcae 1294{
122aa6f9
JK
1295 if (!one->driver)
1296 one->driver = userdiff_find_by_path(one->path);
1297 if (!one->driver)
1298 one->driver = userdiff_find_by_name("default");
29a3eefd
JH
1299}
1300
1301int diff_filespec_is_binary(struct diff_filespec *one)
1302{
122aa6f9
JK
1303 if (one->is_binary == -1) {
1304 diff_filespec_load_driver(one);
1305 if (one->driver->binary != -1)
1306 one->is_binary = one->driver->binary;
1307 else {
1308 if (!one->data && DIFF_FILE_VALID(one))
1309 diff_populate_filespec(one, 0);
1310 if (one->data)
1311 one->is_binary = buffer_is_binary(one->data,
1312 one->size);
1313 if (one->is_binary == -1)
1314 one->is_binary = 0;
1315 }
1316 }
29a3eefd 1317 return one->is_binary;
6973dcae
JH
1318}
1319
be58e70d 1320static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
f258475a 1321{
122aa6f9
JK
1322 diff_filespec_load_driver(one);
1323 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
f258475a
JH
1324}
1325
a5a818ee
JH
1326void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1327{
1328 if (!options->a_prefix)
1329 options->a_prefix = a;
1330 if (!options->b_prefix)
1331 options->b_prefix = b;
1332}
1333
04427ac8
JK
1334static const char *get_textconv(struct diff_filespec *one)
1335{
1336 if (!DIFF_FILE_VALID(one))
1337 return NULL;
2675773a
JK
1338 if (!S_ISREG(one->mode))
1339 return NULL;
04427ac8
JK
1340 diff_filespec_load_driver(one);
1341 return one->driver->textconv;
1342}
1343
6973dcae
JH
1344static void builtin_diff(const char *name_a,
1345 const char *name_b,
1346 struct diff_filespec *one,
1347 struct diff_filespec *two,
1348 const char *xfrm_msg,
051308f6 1349 struct diff_options *o,
6973dcae
JH
1350 int complete_rewrite)
1351{
1352 mmfile_t mf1, mf2;
1353 const char *lbl[2];
1354 char *a_one, *b_two;
8f67f8ae
PH
1355 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1356 const char *reset = diff_get_color_opt(o, DIFF_RESET);
a5a818ee 1357 const char *a_prefix, *b_prefix;
c7534ef4 1358 const char *textconv_one = NULL, *textconv_two = NULL;
a5a818ee 1359
3aa1f7ca
JK
1360 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1361 textconv_one = get_textconv(one);
1362 textconv_two = get_textconv(two);
1363 }
1364
a5a818ee
JH
1365 diff_set_mnemonic_prefix(o, "a/", "b/");
1366 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1367 a_prefix = o->b_prefix;
1368 b_prefix = o->a_prefix;
1369 } else {
1370 a_prefix = o->a_prefix;
1371 b_prefix = o->b_prefix;
1372 }
6973dcae 1373
71b989e7
LT
1374 /* Never use a non-valid filename anywhere if at all possible */
1375 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1376 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1377
a5a818ee
JH
1378 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1379 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
6973dcae
JH
1380 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1381 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
c0c77734 1382 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
6973dcae
JH
1383 if (lbl[0][0] == '/') {
1384 /* /dev/null */
c0c77734 1385 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
50f575fc 1386 if (xfrm_msg && xfrm_msg[0])
c0c77734 1387 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1388 }
1389 else if (lbl[1][0] == '/') {
c0c77734 1390 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
50f575fc 1391 if (xfrm_msg && xfrm_msg[0])
c0c77734 1392 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1393 }
1394 else {
1395 if (one->mode != two->mode) {
c0c77734
DB
1396 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1397 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
cd112cef 1398 }
50f575fc 1399 if (xfrm_msg && xfrm_msg[0])
c0c77734 1400 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1401 /*
1402 * we do not run diff between different kind
1403 * of objects.
1404 */
1405 if ((one->mode ^ two->mode) & S_IFMT)
1406 goto free_ab_and_return;
0c01857d 1407 if (complete_rewrite &&
3aa1f7ca
JK
1408 (textconv_one || !diff_filespec_is_binary(one)) &&
1409 (textconv_two || !diff_filespec_is_binary(two))) {
1410 emit_rewrite_diff(name_a, name_b, one, two,
1411 textconv_one, textconv_two, o);
34a5e1a2 1412 o->found_changes = 1;
6973dcae
JH
1413 goto free_ab_and_return;
1414 }
1415 }
1416
1417 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1418 die("unable to read files to diff");
1419
8f67f8ae 1420 if (!DIFF_OPT_TST(o, TEXT) &&
04427ac8
JK
1421 ( (diff_filespec_is_binary(one) && !textconv_one) ||
1422 (diff_filespec_is_binary(two) && !textconv_two) )) {
0660626c
JH
1423 /* Quite common confusing case */
1424 if (mf1.size == mf2.size &&
1425 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1426 goto free_ab_and_return;
8f67f8ae 1427 if (DIFF_OPT_TST(o, BINARY))
c0c77734 1428 emit_binary_diff(o->file, &mf1, &mf2);
051308f6 1429 else
c0c77734
DB
1430 fprintf(o->file, "Binary files %s and %s differ\n",
1431 lbl[0], lbl[1]);
34a5e1a2 1432 o->found_changes = 1;
051308f6 1433 }
6973dcae
JH
1434 else {
1435 /* Crazy xdl interfaces.. */
1436 const char *diffopts = getenv("GIT_DIFF_OPTS");
1437 xpparam_t xpp;
1438 xdemitconf_t xecfg;
1439 xdemitcb_t ecb;
1440 struct emit_callback ecbdata;
be58e70d 1441 const struct userdiff_funcname *pe;
f258475a 1442
04427ac8
JK
1443 if (textconv_one) {
1444 size_t size;
1445 mf1.ptr = run_textconv(textconv_one, one, &size);
1446 if (!mf1.ptr)
1447 die("unable to read files to diff");
1448 mf1.size = size;
1449 }
1450 if (textconv_two) {
1451 size_t size;
1452 mf2.ptr = run_textconv(textconv_two, two, &size);
1453 if (!mf2.ptr)
1454 die("unable to read files to diff");
1455 mf2.size = size;
1456 }
1457
45e7ca0f
BC
1458 pe = diff_funcname_pattern(one);
1459 if (!pe)
1460 pe = diff_funcname_pattern(two);
6973dcae 1461
9ccd0a88 1462 memset(&xpp, 0, sizeof(xpp));
30b25010 1463 memset(&xecfg, 0, sizeof(xecfg));
cd112cef 1464 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 1465 ecbdata.label_path = lbl;
8f67f8ae 1466 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
34a5e1a2 1467 ecbdata.found_changesp = &o->found_changes;
cf1b7869 1468 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
c0c77734 1469 ecbdata.file = o->file;
0d21efa5 1470 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
ee1e5412 1471 xecfg.ctxlen = o->context;
6973dcae 1472 xecfg.flags = XDL_EMIT_FUNCNAMES;
45e7ca0f 1473 if (pe)
a013585b 1474 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
6973dcae
JH
1475 if (!diffopts)
1476 ;
cc44c765 1477 else if (!prefixcmp(diffopts, "--unified="))
6973dcae 1478 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
cc44c765 1479 else if (!prefixcmp(diffopts, "-u"))
6973dcae 1480 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
c0c77734 1481 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
f59a59e2
JS
1482 ecbdata.diff_words =
1483 xcalloc(1, sizeof(struct diff_words_data));
c0c77734
DB
1484 ecbdata.diff_words->file = o->file;
1485 }
8a3f524b
JH
1486 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1487 &xpp, &xecfg, &ecb);
8f67f8ae 1488 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
f59a59e2 1489 free_diff_words_data(&ecbdata);
04427ac8
JK
1490 if (textconv_one)
1491 free(mf1.ptr);
1492 if (textconv_two)
1493 free(mf2.ptr);
6973dcae
JH
1494 }
1495
1496 free_ab_and_return:
fc3abdf5
JH
1497 diff_free_filespec_data(one);
1498 diff_free_filespec_data(two);
6973dcae
JH
1499 free(a_one);
1500 free(b_two);
1501 return;
1502}
1503
1504static void builtin_diffstat(const char *name_a, const char *name_b,
1505 struct diff_filespec *one,
1506 struct diff_filespec *two,
710158e3 1507 struct diffstat_t *diffstat,
0d21efa5 1508 struct diff_options *o,
710158e3 1509 int complete_rewrite)
6973dcae
JH
1510{
1511 mmfile_t mf1, mf2;
1512 struct diffstat_file *data;
1513
1514 data = diffstat_add(diffstat, name_a, name_b);
1515
1516 if (!one || !two) {
1517 data->is_unmerged = 1;
1518 return;
1519 }
710158e3
JH
1520 if (complete_rewrite) {
1521 diff_populate_filespec(one, 0);
1522 diff_populate_filespec(two, 0);
1523 data->deleted = count_lines(one->data, one->size);
1524 data->added = count_lines(two->data, two->size);
fc3abdf5 1525 goto free_and_return;
710158e3 1526 }
6973dcae
JH
1527 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1528 die("unable to read files to diff");
1529
29a3eefd 1530 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
6973dcae 1531 data->is_binary = 1;
b1882587
AP
1532 data->added = mf2.size;
1533 data->deleted = mf1.size;
1534 } else {
6973dcae
JH
1535 /* Crazy xdl interfaces.. */
1536 xpparam_t xpp;
1537 xdemitconf_t xecfg;
1538 xdemitcb_t ecb;
1539
9ccd0a88 1540 memset(&xpp, 0, sizeof(xpp));
30b25010 1541 memset(&xecfg, 0, sizeof(xecfg));
0d21efa5 1542 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
8a3f524b
JH
1543 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1544 &xpp, &xecfg, &ecb);
6973dcae 1545 }
fc3abdf5
JH
1546
1547 free_and_return:
1548 diff_free_filespec_data(one);
1549 diff_free_filespec_data(two);
6973dcae
JH
1550}
1551
88246898 1552static void builtin_checkdiff(const char *name_a, const char *name_b,
cd676a51 1553 const char *attr_path,
5ff10dd6
JH
1554 struct diff_filespec *one,
1555 struct diff_filespec *two,
1556 struct diff_options *o)
88246898
JS
1557{
1558 mmfile_t mf1, mf2;
1559 struct checkdiff_t data;
1560
1561 if (!two)
1562 return;
1563
1564 memset(&data, 0, sizeof(data));
88246898
JS
1565 data.filename = name_b ? name_b : name_a;
1566 data.lineno = 0;
1ba111d1 1567 data.o = o;
cd676a51 1568 data.ws_rule = whitespace_rule(attr_path);
88246898
JS
1569
1570 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1571 die("unable to read files to diff");
1572
5ff10dd6
JH
1573 /*
1574 * All the other codepaths check both sides, but not checking
1575 * the "old" side here is deliberate. We are checking the newly
1576 * introduced changes, and as long as the "new" side is text, we
1577 * can and should check what it introduces.
1578 */
29a3eefd 1579 if (diff_filespec_is_binary(two))
fc3abdf5 1580 goto free_and_return;
88246898
JS
1581 else {
1582 /* Crazy xdl interfaces.. */
1583 xpparam_t xpp;
1584 xdemitconf_t xecfg;
1585 xdemitcb_t ecb;
1586
9ccd0a88 1587 memset(&xpp, 0, sizeof(xpp));
30b25010 1588 memset(&xecfg, 0, sizeof(xecfg));
c35539eb 1589 xecfg.ctxlen = 1; /* at least one context line */
88246898 1590 xpp.flags = XDF_NEED_MINIMAL;
8a3f524b
JH
1591 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1592 &xpp, &xecfg, &ecb);
877f23cc 1593
04c6e9e9
JH
1594 if ((data.ws_rule & WS_TRAILING_SPACE) &&
1595 data.trailing_blanks_start) {
877f23cc
JH
1596 fprintf(o->file, "%s:%d: ends with blank lines.\n",
1597 data.filename, data.trailing_blanks_start);
1598 data.status = 1; /* report errors */
1599 }
88246898 1600 }
fc3abdf5
JH
1601 free_and_return:
1602 diff_free_filespec_data(one);
1603 diff_free_filespec_data(two);
62c64895
WC
1604 if (data.status)
1605 DIFF_OPT_SET(o, CHECK_FAILED);
88246898
JS
1606}
1607
6973dcae
JH
1608struct diff_filespec *alloc_filespec(const char *path)
1609{
1610 int namelen = strlen(path);
1611 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1612
1613 memset(spec, 0, sizeof(*spec));
1614 spec->path = (char *)(spec + 1);
1615 memcpy(spec->path, path, namelen+1);
9fb88419 1616 spec->count = 1;
122aa6f9 1617 spec->is_binary = -1;
6973dcae
JH
1618 return spec;
1619}
1620
9fb88419
LT
1621void free_filespec(struct diff_filespec *spec)
1622{
1623 if (!--spec->count) {
1624 diff_free_filespec_data(spec);
1625 free(spec);
1626 }
1627}
1628
6973dcae
JH
1629void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1630 unsigned short mode)
1631{
1632 if (mode) {
1633 spec->mode = canon_mode(mode);
e702496e 1634 hashcpy(spec->sha1, sha1);
0bef57ee 1635 spec->sha1_valid = !is_null_sha1(sha1);
6973dcae
JH
1636 }
1637}
1638
1639/*
5adf317b 1640 * Given a name and sha1 pair, if the index tells us the file in
6973dcae
JH
1641 * the work tree has that object contents, return true, so that
1642 * prepare_temp_file() does not have to inflate and extract.
1643 */
1510fea7 1644static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
6973dcae
JH
1645{
1646 struct cache_entry *ce;
1647 struct stat st;
1648 int pos, len;
1649
1650 /* We do not read the cache ourselves here, because the
1651 * benchmark with my previous version that always reads cache
1652 * shows that it makes things worse for diff-tree comparing
1653 * two linux-2.6 kernel trees in an already checked out work
1654 * tree. This is because most diff-tree comparisons deal with
1655 * only a small number of files, while reading the cache is
1656 * expensive for a large project, and its cost outweighs the
1657 * savings we get by not inflating the object to a temporary
1658 * file. Practically, this code only helps when we are used
1659 * by diff-cache --cached, which does read the cache before
1660 * calling us.
1661 */
1662 if (!active_cache)
1663 return 0;
1664
1510fea7
SP
1665 /* We want to avoid the working directory if our caller
1666 * doesn't need the data in a normal file, this system
1667 * is rather slow with its stat/open/mmap/close syscalls,
1668 * and the object is contained in a pack file. The pack
1669 * is probably already open and will be faster to obtain
1670 * the data through than the working directory. Loose
1671 * objects however would tend to be slower as they need
1672 * to be individually opened and inflated.
1673 */
5caf9232 1674 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1510fea7
SP
1675 return 0;
1676
6973dcae
JH
1677 len = strlen(name);
1678 pos = cache_name_pos(name, len);
1679 if (pos < 0)
1680 return 0;
1681 ce = active_cache[pos];
eadb5831
JH
1682
1683 /*
1684 * This is not the sha1 we are looking for, or
1685 * unreusable because it is not a regular file.
1686 */
1687 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
6973dcae 1688 return 0;
eadb5831
JH
1689
1690 /*
1691 * If ce matches the file in the work tree, we can reuse it.
6973dcae 1692 */
eadb5831
JH
1693 if (ce_uptodate(ce) ||
1694 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1695 return 1;
1696
1697 return 0;
6973dcae
JH
1698}
1699
3afaa72d
JH
1700static int populate_from_stdin(struct diff_filespec *s)
1701{
f285a2d7 1702 struct strbuf buf = STRBUF_INIT;
c32f749f 1703 size_t size = 0;
af6eb822 1704
f1696ee3 1705 if (strbuf_read(&buf, 0, 0) < 0)
af6eb822 1706 return error("error while reading from stdin %s",
3afaa72d 1707 strerror(errno));
af6eb822 1708
3afaa72d 1709 s->should_munmap = 0;
c32f749f
RS
1710 s->data = strbuf_detach(&buf, &size);
1711 s->size = size;
3afaa72d
JH
1712 s->should_free = 1;
1713 return 0;
1714}
1715
04786756
LT
1716static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1717{
1718 int len;
1719 char *data = xmalloc(100);
1720 len = snprintf(data, 100,
1721 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1722 s->data = data;
1723 s->size = len;
1724 s->should_free = 1;
1725 if (size_only) {
1726 s->data = NULL;
1727 free(data);
1728 }
1729 return 0;
1730}
1731
6973dcae
JH
1732/*
1733 * While doing rename detection and pickaxe operation, we may need to
1734 * grab the data for the blob (or file) for our own in-core comparison.
1735 * diff_filespec has data and size fields for this purpose.
1736 */
1737int diff_populate_filespec(struct diff_filespec *s, int size_only)
1738{
1739 int err = 0;
1740 if (!DIFF_FILE_VALID(s))
1741 die("internal error: asking to populate invalid file.");
1742 if (S_ISDIR(s->mode))
1743 return -1;
1744
6973dcae 1745 if (s->data)
fc3abdf5 1746 return 0;
04786756 1747
6e0b8ed6
JH
1748 if (size_only && 0 < s->size)
1749 return 0;
1750
302b9282 1751 if (S_ISGITLINK(s->mode))
04786756
LT
1752 return diff_populate_gitlink(s, size_only);
1753
6973dcae 1754 if (!s->sha1_valid ||
1510fea7 1755 reuse_worktree_file(s->path, s->sha1, 0)) {
f285a2d7 1756 struct strbuf buf = STRBUF_INIT;
6973dcae
JH
1757 struct stat st;
1758 int fd;
6c510bee 1759
3afaa72d
JH
1760 if (!strcmp(s->path, "-"))
1761 return populate_from_stdin(s);
1762
6973dcae
JH
1763 if (lstat(s->path, &st) < 0) {
1764 if (errno == ENOENT) {
1765 err_empty:
1766 err = -1;
1767 empty:
d2543b8e 1768 s->data = (char *)"";
6973dcae
JH
1769 s->size = 0;
1770 return err;
1771 }
1772 }
dc49cd76 1773 s->size = xsize_t(st.st_size);
6973dcae
JH
1774 if (!s->size)
1775 goto empty;
1776 if (size_only)
1777 return 0;
1778 if (S_ISLNK(st.st_mode)) {
1779 int ret;
1780 s->data = xmalloc(s->size);
1781 s->should_free = 1;
1782 ret = readlink(s->path, s->data, s->size);
1783 if (ret < 0) {
1784 free(s->data);
1785 goto err_empty;
1786 }
1787 return 0;
1788 }
1789 fd = open(s->path, O_RDONLY);
1790 if (fd < 0)
1791 goto err_empty;
c4712e45 1792 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 1793 close(fd);
6973dcae 1794 s->should_munmap = 1;
6c510bee
LT
1795
1796 /*
1797 * Convert from working tree format to canonical git format
1798 */
21e5ad50 1799 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
c32f749f 1800 size_t size = 0;
6c510bee
LT
1801 munmap(s->data, s->size);
1802 s->should_munmap = 0;
c32f749f
RS
1803 s->data = strbuf_detach(&buf, &size);
1804 s->size = size;
6c510bee
LT
1805 s->should_free = 1;
1806 }
6973dcae
JH
1807 }
1808 else {
21666f1a 1809 enum object_type type;
6e0b8ed6 1810 if (size_only)
21666f1a 1811 type = sha1_object_info(s->sha1, &s->size);
6973dcae 1812 else {
21666f1a 1813 s->data = read_sha1_file(s->sha1, &type, &s->size);
6973dcae
JH
1814 s->should_free = 1;
1815 }
1816 }
1817 return 0;
1818}
1819
8ae92e63 1820void diff_free_filespec_blob(struct diff_filespec *s)
6973dcae
JH
1821{
1822 if (s->should_free)
1823 free(s->data);
1824 else if (s->should_munmap)
1825 munmap(s->data, s->size);
fc3abdf5
JH
1826
1827 if (s->should_free || s->should_munmap) {
1828 s->should_free = s->should_munmap = 0;
1829 s->data = NULL;
1830 }
eede7b7d
JK
1831}
1832
1833void diff_free_filespec_data(struct diff_filespec *s)
1834{
8ae92e63 1835 diff_free_filespec_blob(s);
6973dcae
JH
1836 free(s->cnt_data);
1837 s->cnt_data = NULL;
1838}
1839
1840static void prep_temp_blob(struct diff_tempfile *temp,
1841 void *blob,
1842 unsigned long size,
1843 const unsigned char *sha1,
1844 int mode)
1845{
1846 int fd;
1847
1472966c 1848 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
6973dcae 1849 if (fd < 0)
e7a7be88 1850 die("unable to create temp-file: %s", strerror(errno));
93822c22 1851 if (write_in_full(fd, blob, size) != size)
6973dcae
JH
1852 die("unable to write temp-file");
1853 close(fd);
1854 temp->name = temp->tmp_path;
1855 strcpy(temp->hex, sha1_to_hex(sha1));
1856 temp->hex[40] = 0;
1857 sprintf(temp->mode, "%06o", mode);
1858}
1859
1860static void prepare_temp_file(const char *name,
1861 struct diff_tempfile *temp,
1862 struct diff_filespec *one)
1863{
1864 if (!DIFF_FILE_VALID(one)) {
1865 not_a_valid_file:
1866 /* A '-' entry produces this for file-2, and
1867 * a '+' entry produces this for file-1.
1868 */
1869 temp->name = "/dev/null";
1870 strcpy(temp->hex, ".");
1871 strcpy(temp->mode, ".");
1872 return;
1873 }
1874
1875 if (!one->sha1_valid ||
1510fea7 1876 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
1877 struct stat st;
1878 if (lstat(name, &st) < 0) {
1879 if (errno == ENOENT)
1880 goto not_a_valid_file;
1881 die("stat(%s): %s", name, strerror(errno));
1882 }
1883 if (S_ISLNK(st.st_mode)) {
1884 int ret;
1885 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
dc49cd76 1886 size_t sz = xsize_t(st.st_size);
6973dcae
JH
1887 if (sizeof(buf) <= st.st_size)
1888 die("symlink too long: %s", name);
dc49cd76 1889 ret = readlink(name, buf, sz);
6973dcae
JH
1890 if (ret < 0)
1891 die("readlink(%s)", name);
dc49cd76 1892 prep_temp_blob(temp, buf, sz,
6973dcae
JH
1893 (one->sha1_valid ?
1894 one->sha1 : null_sha1),
1895 (one->sha1_valid ?
1896 one->mode : S_IFLNK));
1897 }
1898 else {
1899 /* we can borrow from the file in the work tree */
1900 temp->name = name;
1901 if (!one->sha1_valid)
1902 strcpy(temp->hex, sha1_to_hex(null_sha1));
1903 else
1904 strcpy(temp->hex, sha1_to_hex(one->sha1));
1905 /* Even though we may sometimes borrow the
1906 * contents from the work tree, we always want
1907 * one->mode. mode is trustworthy even when
1908 * !(one->sha1_valid), as long as
1909 * DIFF_FILE_VALID(one).
1910 */
1911 sprintf(temp->mode, "%06o", one->mode);
1912 }
1913 return;
1914 }
1915 else {
1916 if (diff_populate_filespec(one, 0))
1917 die("cannot read data blob for %s", one->path);
1918 prep_temp_blob(temp, one->data, one->size,
1919 one->sha1, one->mode);
1920 }
1921}
1922
1923static void remove_tempfile(void)
1924{
1925 int i;
1926
1927 for (i = 0; i < 2; i++)
1928 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1929 unlink(diff_temp[i].name);
1930 diff_temp[i].name = NULL;
1931 }
1932}
1933
1934static void remove_tempfile_on_signal(int signo)
1935{
1936 remove_tempfile();
1937 signal(SIGINT, SIG_DFL);
1938 raise(signo);
1939}
1940
6973dcae
JH
1941/* An external diff command takes:
1942 *
1943 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1944 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1945 *
1946 */
1947static void run_external_diff(const char *pgm,
1948 const char *name,
1949 const char *other,
1950 struct diff_filespec *one,
1951 struct diff_filespec *two,
1952 const char *xfrm_msg,
1953 int complete_rewrite)
1954{
1955 const char *spawn_arg[10];
1956 struct diff_tempfile *temp = diff_temp;
1957 int retval;
1958 static int atexit_asked = 0;
1959 const char *othername;
1960 const char **arg = &spawn_arg[0];
1961
1962 othername = (other? other : name);
1963 if (one && two) {
1964 prepare_temp_file(name, &temp[0], one);
1965 prepare_temp_file(othername, &temp[1], two);
1966 if (! atexit_asked &&
1967 (temp[0].name == temp[0].tmp_path ||
1968 temp[1].name == temp[1].tmp_path)) {
1969 atexit_asked = 1;
1970 atexit(remove_tempfile);
1971 }
1972 signal(SIGINT, remove_tempfile_on_signal);
1973 }
1974
1975 if (one && two) {
1976 *arg++ = pgm;
1977 *arg++ = name;
1978 *arg++ = temp[0].name;
1979 *arg++ = temp[0].hex;
1980 *arg++ = temp[0].mode;
1981 *arg++ = temp[1].name;
1982 *arg++ = temp[1].hex;
1983 *arg++ = temp[1].mode;
1984 if (other) {
1985 *arg++ = other;
1986 *arg++ = xfrm_msg;
1987 }
1988 } else {
1989 *arg++ = pgm;
1990 *arg++ = name;
1991 }
1992 *arg = NULL;
d5535ec7
JS
1993 fflush(NULL);
1994 retval = run_command_v_opt(spawn_arg, 0);
6973dcae
JH
1995 remove_tempfile();
1996 if (retval) {
1997 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1998 exit(1);
1999 }
2000}
2001
2002static void run_diff_cmd(const char *pgm,
2003 const char *name,
2004 const char *other,
cd676a51 2005 const char *attr_path,
6973dcae
JH
2006 struct diff_filespec *one,
2007 struct diff_filespec *two,
2008 const char *xfrm_msg,
051308f6 2009 struct diff_options *o,
6973dcae
JH
2010 int complete_rewrite)
2011{
8f67f8ae 2012 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
f1af60bd
JH
2013 pgm = NULL;
2014 else {
be58e70d
JK
2015 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2016 if (drv && drv->external)
2017 pgm = drv->external;
f1af60bd
JH
2018 }
2019
6973dcae
JH
2020 if (pgm) {
2021 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2022 complete_rewrite);
2023 return;
2024 }
2025 if (one && two)
2026 builtin_diff(name, other ? other : name,
051308f6 2027 one, two, xfrm_msg, o, complete_rewrite);
6973dcae 2028 else
c0c77734 2029 fprintf(o->file, "* Unmerged path %s\n", name);
6973dcae
JH
2030}
2031
2032static void diff_fill_sha1_info(struct diff_filespec *one)
2033{
2034 if (DIFF_FILE_VALID(one)) {
2035 if (!one->sha1_valid) {
2036 struct stat st;
5332b2af
JS
2037 if (!strcmp(one->path, "-")) {
2038 hashcpy(one->sha1, null_sha1);
2039 return;
2040 }
6973dcae
JH
2041 if (lstat(one->path, &st) < 0)
2042 die("stat %s", one->path);
2043 if (index_path(one->sha1, one->path, &st, 0))
2044 die("cannot hash %s\n", one->path);
2045 }
2046 }
2047 else
e702496e 2048 hashclr(one->sha1);
6973dcae
JH
2049}
2050
125b7630
RS
2051static int similarity_index(struct diff_filepair *p)
2052{
2053 return p->score * 100 / MAX_SCORE;
2054}
2055
cd676a51
JH
2056static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2057{
2058 /* Strip the prefix but do not molest /dev/null and absolute paths */
2059 if (*namep && **namep != '/')
2060 *namep += prefix_length;
2061 if (*otherp && **otherp != '/')
2062 *otherp += prefix_length;
2063}
2064
6973dcae
JH
2065static void run_diff(struct diff_filepair *p, struct diff_options *o)
2066{
2067 const char *pgm = external_diff();
663af342
PH
2068 struct strbuf msg;
2069 char *xfrm_msg;
2070 struct diff_filespec *one = p->one;
2071 struct diff_filespec *two = p->two;
6973dcae
JH
2072 const char *name;
2073 const char *other;
cd676a51 2074 const char *attr_path;
6973dcae 2075 int complete_rewrite = 0;
663af342 2076
cd676a51
JH
2077 name = p->one->path;
2078 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2079 attr_path = name;
2080 if (o->prefix_length)
2081 strip_prefix(o->prefix_length, &name, &other);
6973dcae
JH
2082
2083 if (DIFF_PAIR_UNMERGED(p)) {
cd676a51
JH
2084 run_diff_cmd(pgm, name, NULL, attr_path,
2085 NULL, NULL, NULL, o, 0);
6973dcae
JH
2086 return;
2087 }
2088
6973dcae
JH
2089 diff_fill_sha1_info(one);
2090 diff_fill_sha1_info(two);
2091
663af342 2092 strbuf_init(&msg, PATH_MAX * 2 + 300);
6973dcae
JH
2093 switch (p->status) {
2094 case DIFF_STATUS_COPIED:
663af342
PH
2095 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2096 strbuf_addstr(&msg, "\ncopy from ");
2097 quote_c_style(name, &msg, NULL, 0);
2098 strbuf_addstr(&msg, "\ncopy to ");
2099 quote_c_style(other, &msg, NULL, 0);
2100 strbuf_addch(&msg, '\n');
6973dcae
JH
2101 break;
2102 case DIFF_STATUS_RENAMED:
663af342
PH
2103 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2104 strbuf_addstr(&msg, "\nrename from ");
2105 quote_c_style(name, &msg, NULL, 0);
2106 strbuf_addstr(&msg, "\nrename to ");
2107 quote_c_style(other, &msg, NULL, 0);
2108 strbuf_addch(&msg, '\n');
6973dcae
JH
2109 break;
2110 case DIFF_STATUS_MODIFIED:
2111 if (p->score) {
663af342 2112 strbuf_addf(&msg, "dissimilarity index %d%%\n",
125b7630 2113 similarity_index(p));
6973dcae
JH
2114 complete_rewrite = 1;
2115 break;
2116 }
2117 /* fallthru */
2118 default:
2119 /* nothing */
2120 ;
2121 }
2122
a89fccd2 2123 if (hashcmp(one->sha1, two->sha1)) {
8f67f8ae 2124 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
6973dcae 2125
8f67f8ae 2126 if (DIFF_OPT_TST(o, BINARY)) {
82793c55 2127 mmfile_t mf;
29a3eefd
JH
2128 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2129 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
82793c55
JH
2130 abbrev = 40;
2131 }
663af342 2132 strbuf_addf(&msg, "index %.*s..%.*s",
dcb3450f
LT
2133 abbrev, sha1_to_hex(one->sha1),
2134 abbrev, sha1_to_hex(two->sha1));
6973dcae 2135 if (one->mode == two->mode)
663af342
PH
2136 strbuf_addf(&msg, " %06o", one->mode);
2137 strbuf_addch(&msg, '\n');
6973dcae
JH
2138 }
2139
663af342
PH
2140 if (msg.len)
2141 strbuf_setlen(&msg, msg.len - 1);
2142 xfrm_msg = msg.len ? msg.buf : NULL;
6973dcae
JH
2143
2144 if (!pgm &&
2145 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2146 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2147 /* a filepair that changes between file and symlink
2148 * needs to be split into deletion and creation.
2149 */
2150 struct diff_filespec *null = alloc_filespec(two->path);
cd676a51
JH
2151 run_diff_cmd(NULL, name, other, attr_path,
2152 one, null, xfrm_msg, o, 0);
6973dcae
JH
2153 free(null);
2154 null = alloc_filespec(one->path);
cd676a51
JH
2155 run_diff_cmd(NULL, name, other, attr_path,
2156 null, two, xfrm_msg, o, 0);
6973dcae
JH
2157 free(null);
2158 }
2159 else
cd676a51
JH
2160 run_diff_cmd(pgm, name, other, attr_path,
2161 one, two, xfrm_msg, o, complete_rewrite);
6973dcae 2162
663af342 2163 strbuf_release(&msg);
6973dcae
JH
2164}
2165
2166static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2167 struct diffstat_t *diffstat)
2168{
2169 const char *name;
2170 const char *other;
710158e3 2171 int complete_rewrite = 0;
6973dcae
JH
2172
2173 if (DIFF_PAIR_UNMERGED(p)) {
2174 /* unmerged */
0d21efa5 2175 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
2176 return;
2177 }
2178
2179 name = p->one->path;
2180 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2181
cd676a51
JH
2182 if (o->prefix_length)
2183 strip_prefix(o->prefix_length, &name, &other);
2184
6973dcae
JH
2185 diff_fill_sha1_info(p->one);
2186 diff_fill_sha1_info(p->two);
2187
710158e3
JH
2188 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2189 complete_rewrite = 1;
0d21efa5 2190 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
2191}
2192
88246898
JS
2193static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2194{
2195 const char *name;
2196 const char *other;
cd676a51 2197 const char *attr_path;
88246898
JS
2198
2199 if (DIFF_PAIR_UNMERGED(p)) {
2200 /* unmerged */
2201 return;
2202 }
2203
2204 name = p->one->path;
2205 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
cd676a51
JH
2206 attr_path = other ? other : name;
2207
2208 if (o->prefix_length)
2209 strip_prefix(o->prefix_length, &name, &other);
88246898
JS
2210
2211 diff_fill_sha1_info(p->one);
2212 diff_fill_sha1_info(p->two);
2213
cd676a51 2214 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
88246898
JS
2215}
2216
6973dcae
JH
2217void diff_setup(struct diff_options *options)
2218{
2219 memset(options, 0, sizeof(*options));
c0c77734
DB
2220
2221 options->file = stdout;
2222
6973dcae
JH
2223 options->line_termination = '\n';
2224 options->break_opt = -1;
2225 options->rename_limit = -1;
7df7c019 2226 options->dirstat_percent = 3;
f88d225f 2227 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
ee1e5412 2228 options->context = 3;
6973dcae
JH
2229
2230 options->change = diff_change;
2231 options->add_remove = diff_addremove;
6b2f2d98 2232 if (diff_use_color_default > 0)
8f67f8ae
PH
2233 DIFF_OPT_SET(options, COLOR_DIFF);
2234 else
2235 DIFF_OPT_CLR(options, COLOR_DIFF);
b68ea12e 2236 options->detect_rename = diff_detect_rename_default;
eab9a40b 2237
a5a818ee
JH
2238 if (!diff_mnemonic_prefix) {
2239 options->a_prefix = "a/";
2240 options->b_prefix = "b/";
2241 }
6973dcae
JH
2242}
2243
2244int diff_setup_done(struct diff_options *options)
2245{
d7de00f7
TH
2246 int count = 0;
2247
2248 if (options->output_format & DIFF_FORMAT_NAME)
2249 count++;
2250 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2251 count++;
2252 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2253 count++;
2254 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2255 count++;
2256 if (count > 1)
2257 die("--name-only, --name-status, --check and -s are mutually exclusive");
2258
8f67f8ae 2259 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
03b9d560
JH
2260 options->detect_rename = DIFF_DETECT_COPY;
2261
cd676a51
JH
2262 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2263 options->prefix = NULL;
2264 if (options->prefix)
2265 options->prefix_length = strlen(options->prefix);
2266 else
2267 options->prefix_length = 0;
2268
c6744349
TH
2269 if (options->output_format & (DIFF_FORMAT_NAME |
2270 DIFF_FORMAT_NAME_STATUS |
2271 DIFF_FORMAT_CHECKDIFF |
2272 DIFF_FORMAT_NO_OUTPUT))
2273 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 2274 DIFF_FORMAT_NUMSTAT |
c6744349 2275 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2276 DIFF_FORMAT_SHORTSTAT |
7df7c019 2277 DIFF_FORMAT_DIRSTAT |
c6744349
TH
2278 DIFF_FORMAT_SUMMARY |
2279 DIFF_FORMAT_PATCH);
2280
6973dcae
JH
2281 /*
2282 * These cases always need recursive; we do not drop caller-supplied
2283 * recursive bits for other formats here.
2284 */
c6744349 2285 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 2286 DIFF_FORMAT_NUMSTAT |
c6744349 2287 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2288 DIFF_FORMAT_SHORTSTAT |
7df7c019 2289 DIFF_FORMAT_DIRSTAT |
d7014dc0 2290 DIFF_FORMAT_SUMMARY |
c6744349 2291 DIFF_FORMAT_CHECKDIFF))
8f67f8ae 2292 DIFF_OPT_SET(options, RECURSIVE);
5e363541 2293 /*
3969cf7d 2294 * Also pickaxe would not work very well if you do not say recursive
5e363541 2295 */
3969cf7d 2296 if (options->pickaxe)
8f67f8ae 2297 DIFF_OPT_SET(options, RECURSIVE);
5e363541 2298
6973dcae
JH
2299 if (options->detect_rename && options->rename_limit < 0)
2300 options->rename_limit = diff_rename_limit_default;
2301 if (options->setup & DIFF_SETUP_USE_CACHE) {
2302 if (!active_cache)
2303 /* read-cache does not die even when it fails
2304 * so it is safe for us to do this here. Also
2305 * it does not smudge active_cache or active_nr
2306 * when it fails, so we do not have to worry about
2307 * cleaning it up ourselves either.
2308 */
2309 read_cache();
2310 }
6973dcae
JH
2311 if (options->abbrev <= 0 || 40 < options->abbrev)
2312 options->abbrev = 40; /* full */
2313
68aacb2f
JH
2314 /*
2315 * It does not make sense to show the first hit we happened
2316 * to have found. It does not make sense not to return with
2317 * exit code in such a case either.
2318 */
8f67f8ae 2319 if (DIFF_OPT_TST(options, QUIET)) {
68aacb2f 2320 options->output_format = DIFF_FORMAT_NO_OUTPUT;
8f67f8ae 2321 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f
JH
2322 }
2323
6973dcae
JH
2324 return 0;
2325}
2326
d2543b8e 2327static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
2328{
2329 char c, *eq;
2330 int len;
2331
2332 if (*arg != '-')
2333 return 0;
2334 c = *++arg;
2335 if (!c)
2336 return 0;
2337 if (c == arg_short) {
2338 c = *++arg;
2339 if (!c)
2340 return 1;
2341 if (val && isdigit(c)) {
2342 char *end;
2343 int n = strtoul(arg, &end, 10);
2344 if (*end)
2345 return 0;
2346 *val = n;
2347 return 1;
2348 }
2349 return 0;
2350 }
2351 if (c != '-')
2352 return 0;
2353 arg++;
2354 eq = strchr(arg, '=');
2355 if (eq)
2356 len = eq - arg;
2357 else
2358 len = strlen(arg);
2359 if (!len || strncmp(arg, arg_long, len))
2360 return 0;
2361 if (eq) {
2362 int n;
2363 char *end;
2364 if (!isdigit(*++eq))
2365 return 0;
2366 n = strtoul(eq, &end, 10);
2367 if (*end)
2368 return 0;
2369 *val = n;
2370 }
2371 return 1;
2372}
2373
16befb8b
JH
2374static int diff_scoreopt_parse(const char *opt);
2375
6973dcae
JH
2376int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2377{
2378 const char *arg = av[0];
d054680c
PH
2379
2380 /* Output format options */
6973dcae 2381 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
c6744349 2382 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 2383 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 2384 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
2385 else if (!strcmp(arg, "--raw"))
2386 options->output_format |= DIFF_FORMAT_RAW;
8f67f8ae 2387 else if (!strcmp(arg, "--patch-with-raw"))
c6744349 2388 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
8f67f8ae 2389 else if (!strcmp(arg, "--numstat"))
74e2abe5 2390 options->output_format |= DIFF_FORMAT_NUMSTAT;
8f67f8ae 2391 else if (!strcmp(arg, "--shortstat"))
ebd124c6 2392 options->output_format |= DIFF_FORMAT_SHORTSTAT;
7df7c019
LT
2393 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2394 options->output_format |= DIFF_FORMAT_DIRSTAT;
f88d225f
JH
2395 else if (!strcmp(arg, "--cumulative")) {
2396 options->output_format |= DIFF_FORMAT_DIRSTAT;
2397 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
fd33777b
HO
2398 } else if (opt_arg(arg, 0, "dirstat-by-file",
2399 &options->dirstat_percent)) {
2400 options->output_format |= DIFF_FORMAT_DIRSTAT;
2401 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
f88d225f 2402 }
d054680c
PH
2403 else if (!strcmp(arg, "--check"))
2404 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2405 else if (!strcmp(arg, "--summary"))
2406 options->output_format |= DIFF_FORMAT_SUMMARY;
2407 else if (!strcmp(arg, "--patch-with-stat"))
2408 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2409 else if (!strcmp(arg, "--name-only"))
2410 options->output_format |= DIFF_FORMAT_NAME;
2411 else if (!strcmp(arg, "--name-status"))
2412 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2413 else if (!strcmp(arg, "-s"))
2414 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
cc44c765 2415 else if (!prefixcmp(arg, "--stat")) {
5c5b2ea9
LT
2416 char *end;
2417 int width = options->stat_width;
2418 int name_width = options->stat_name_width;
2419 arg += 6;
2420 end = (char *)arg;
2421
2422 switch (*arg) {
2423 case '-':
cc44c765 2424 if (!prefixcmp(arg, "-width="))
5c5b2ea9 2425 width = strtoul(arg + 7, &end, 10);
cc44c765 2426 else if (!prefixcmp(arg, "-name-width="))
5c5b2ea9
LT
2427 name_width = strtoul(arg + 12, &end, 10);
2428 break;
2429 case '=':
2430 width = strtoul(arg+1, &end, 10);
2431 if (*end == ',')
2432 name_width = strtoul(end+1, &end, 10);
2433 }
2434
2435 /* Important! This checks all the error cases! */
2436 if (*end)
2437 return 0;
c6744349 2438 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5c5b2ea9
LT
2439 options->stat_name_width = name_width;
2440 options->stat_width = width;
a2540023 2441 }
d054680c
PH
2442
2443 /* renames options */
cc44c765 2444 else if (!prefixcmp(arg, "-B")) {
8f67f8ae 2445 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2446 return -1;
2447 }
cc44c765 2448 else if (!prefixcmp(arg, "-M")) {
8f67f8ae 2449 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2450 return -1;
2451 options->detect_rename = DIFF_DETECT_RENAME;
2452 }
cc44c765 2453 else if (!prefixcmp(arg, "-C")) {
ca6c0970 2454 if (options->detect_rename == DIFF_DETECT_COPY)
8f67f8ae
PH
2455 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2456 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2457 return -1;
2458 options->detect_rename = DIFF_DETECT_COPY;
2459 }
d054680c
PH
2460 else if (!strcmp(arg, "--no-renames"))
2461 options->detect_rename = 0;
cd676a51
JH
2462 else if (!strcmp(arg, "--relative"))
2463 DIFF_OPT_SET(options, RELATIVE_NAME);
c0cb4a06
JH
2464 else if (!prefixcmp(arg, "--relative=")) {
2465 DIFF_OPT_SET(options, RELATIVE_NAME);
2466 options->prefix = arg + 11;
2467 }
d054680c
PH
2468
2469 /* xdiff options */
2470 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2471 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2472 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2473 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2474 else if (!strcmp(arg, "--ignore-space-at-eol"))
2475 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2476
2477 /* flags options */
2478 else if (!strcmp(arg, "--binary")) {
2479 options->output_format |= DIFF_FORMAT_PATCH;
2480 DIFF_OPT_SET(options, BINARY);
2481 }
2482 else if (!strcmp(arg, "--full-index"))
2483 DIFF_OPT_SET(options, FULL_INDEX);
2484 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2485 DIFF_OPT_SET(options, TEXT);
2486 else if (!strcmp(arg, "-R"))
2487 DIFF_OPT_SET(options, REVERSE_DIFF);
6973dcae 2488 else if (!strcmp(arg, "--find-copies-harder"))
8f67f8ae 2489 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
750f7b66 2490 else if (!strcmp(arg, "--follow"))
8f67f8ae 2491 DIFF_OPT_SET(options, FOLLOW_RENAMES);
cd112cef 2492 else if (!strcmp(arg, "--color"))
8f67f8ae 2493 DIFF_OPT_SET(options, COLOR_DIFF);
fef88bb0 2494 else if (!strcmp(arg, "--no-color"))
8f67f8ae 2495 DIFF_OPT_CLR(options, COLOR_DIFF);
f59a59e2 2496 else if (!strcmp(arg, "--color-words"))
8f67f8ae 2497 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
41bbf9d5 2498 else if (!strcmp(arg, "--exit-code"))
8f67f8ae 2499 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f 2500 else if (!strcmp(arg, "--quiet"))
8f67f8ae 2501 DIFF_OPT_SET(options, QUIET);
72909bef 2502 else if (!strcmp(arg, "--ext-diff"))
8f67f8ae 2503 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
72909bef 2504 else if (!strcmp(arg, "--no-ext-diff"))
8f67f8ae 2505 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
e10ea812
JK
2506 else if (!strcmp(arg, "--textconv"))
2507 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
2508 else if (!strcmp(arg, "--no-textconv"))
2509 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
50fd9bd8
JS
2510 else if (!strcmp(arg, "--ignore-submodules"))
2511 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
d054680c
PH
2512
2513 /* misc options */
2514 else if (!strcmp(arg, "-z"))
2515 options->line_termination = 0;
2516 else if (!prefixcmp(arg, "-l"))
2517 options->rename_limit = strtoul(arg+2, NULL, 10);
2518 else if (!prefixcmp(arg, "-S"))
2519 options->pickaxe = arg + 2;
2520 else if (!strcmp(arg, "--pickaxe-all"))
2521 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2522 else if (!strcmp(arg, "--pickaxe-regex"))
2523 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2524 else if (!prefixcmp(arg, "-O"))
2525 options->orderfile = arg + 2;
2526 else if (!prefixcmp(arg, "--diff-filter="))
2527 options->filter = arg + 14;
2528 else if (!strcmp(arg, "--abbrev"))
2529 options->abbrev = DEFAULT_ABBREV;
2530 else if (!prefixcmp(arg, "--abbrev=")) {
2531 options->abbrev = strtoul(arg + 9, NULL, 10);
2532 if (options->abbrev < MINIMUM_ABBREV)
2533 options->abbrev = MINIMUM_ABBREV;
2534 else if (40 < options->abbrev)
2535 options->abbrev = 40;
2536 }
eab9a40b
JS
2537 else if (!prefixcmp(arg, "--src-prefix="))
2538 options->a_prefix = arg + 13;
2539 else if (!prefixcmp(arg, "--dst-prefix="))
2540 options->b_prefix = arg + 13;
2541 else if (!strcmp(arg, "--no-prefix"))
2542 options->a_prefix = options->b_prefix = "";
c0c77734
DB
2543 else if (!prefixcmp(arg, "--output=")) {
2544 options->file = fopen(arg + strlen("--output="), "w");
2545 options->close_file = 1;
2546 } else
6973dcae
JH
2547 return 0;
2548 return 1;
2549}
2550
2551static int parse_num(const char **cp_p)
2552{
2553 unsigned long num, scale;
2554 int ch, dot;
2555 const char *cp = *cp_p;
2556
2557 num = 0;
2558 scale = 1;
2559 dot = 0;
2560 for(;;) {
2561 ch = *cp;
2562 if ( !dot && ch == '.' ) {
2563 scale = 1;
2564 dot = 1;
2565 } else if ( ch == '%' ) {
2566 scale = dot ? scale*100 : 100;
2567 cp++; /* % is always at the end */
2568 break;
2569 } else if ( ch >= '0' && ch <= '9' ) {
2570 if ( scale < 100000 ) {
2571 scale *= 10;
2572 num = (num*10) + (ch-'0');
2573 }
2574 } else {
2575 break;
2576 }
2577 cp++;
2578 }
2579 *cp_p = cp;
2580
2581 /* user says num divided by scale and we say internally that
2582 * is MAX_SCORE * num / scale.
2583 */
dc49cd76 2584 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
6973dcae
JH
2585}
2586
16befb8b 2587static int diff_scoreopt_parse(const char *opt)
6973dcae
JH
2588{
2589 int opt1, opt2, cmd;
2590
2591 if (*opt++ != '-')
2592 return -1;
2593 cmd = *opt++;
2594 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2595 return -1; /* that is not a -M, -C nor -B option */
2596
2597 opt1 = parse_num(&opt);
2598 if (cmd != 'B')
2599 opt2 = 0;
2600 else {
2601 if (*opt == 0)
2602 opt2 = 0;
2603 else if (*opt != '/')
2604 return -1; /* we expect -B80/99 or -B80 */
2605 else {
2606 opt++;
2607 opt2 = parse_num(&opt);
2608 }
2609 }
2610 if (*opt != 0)
2611 return -1;
2612 return opt1 | (opt2 << 16);
2613}
2614
2615struct diff_queue_struct diff_queued_diff;
2616
2617void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2618{
2619 if (queue->alloc <= queue->nr) {
2620 queue->alloc = alloc_nr(queue->alloc);
2621 queue->queue = xrealloc(queue->queue,
2622 sizeof(dp) * queue->alloc);
2623 }
2624 queue->queue[queue->nr++] = dp;
2625}
2626
2627struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2628 struct diff_filespec *one,
2629 struct diff_filespec *two)
2630{
ef677686 2631 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
6973dcae
JH
2632 dp->one = one;
2633 dp->two = two;
6973dcae
JH
2634 if (queue)
2635 diff_q(queue, dp);
2636 return dp;
2637}
2638
2639void diff_free_filepair(struct diff_filepair *p)
2640{
9fb88419
LT
2641 free_filespec(p->one);
2642 free_filespec(p->two);
6973dcae
JH
2643 free(p);
2644}
2645
2646/* This is different from find_unique_abbrev() in that
2647 * it stuffs the result with dots for alignment.
2648 */
2649const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2650{
2651 int abblen;
2652 const char *abbrev;
2653 if (len == 40)
2654 return sha1_to_hex(sha1);
2655
2656 abbrev = find_unique_abbrev(sha1, len);
6973dcae
JH
2657 abblen = strlen(abbrev);
2658 if (abblen < 37) {
2659 static char hex[41];
2660 if (len < abblen && abblen <= len + 2)
2661 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2662 else
2663 sprintf(hex, "%s...", abbrev);
2664 return hex;
2665 }
2666 return sha1_to_hex(sha1);
2667}
2668
663af342 2669static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
6973dcae 2670{
663af342
PH
2671 int line_termination = opt->line_termination;
2672 int inter_name_termination = line_termination ? '\t' : '\0';
6973dcae 2673
663af342 2674 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
c0c77734
DB
2675 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2676 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2677 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
6973dcae 2678 }
663af342 2679 if (p->score) {
c0c77734
DB
2680 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2681 inter_name_termination);
663af342 2682 } else {
c0c77734 2683 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
6973dcae 2684 }
6973dcae 2685
cd676a51
JH
2686 if (p->status == DIFF_STATUS_COPIED ||
2687 p->status == DIFF_STATUS_RENAMED) {
2688 const char *name_a, *name_b;
2689 name_a = p->one->path;
2690 name_b = p->two->path;
2691 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734
DB
2692 write_name_quoted(name_a, opt->file, inter_name_termination);
2693 write_name_quoted(name_b, opt->file, line_termination);
663af342 2694 } else {
cd676a51
JH
2695 const char *name_a, *name_b;
2696 name_a = p->one->mode ? p->one->path : p->two->path;
2697 name_b = NULL;
2698 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734 2699 write_name_quoted(name_a, opt->file, line_termination);
663af342 2700 }
6973dcae
JH
2701}
2702
2703int diff_unmodified_pair(struct diff_filepair *p)
2704{
2705 /* This function is written stricter than necessary to support
2706 * the currently implemented transformers, but the idea is to
2707 * let transformers to produce diff_filepairs any way they want,
2708 * and filter and clean them up here before producing the output.
2709 */
663af342 2710 struct diff_filespec *one = p->one, *two = p->two;
6973dcae
JH
2711
2712 if (DIFF_PAIR_UNMERGED(p))
2713 return 0; /* unmerged is interesting */
2714
6973dcae
JH
2715 /* deletion, addition, mode or type change
2716 * and rename are all interesting.
2717 */
2718 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2719 DIFF_PAIR_MODE_CHANGED(p) ||
2720 strcmp(one->path, two->path))
2721 return 0;
2722
2723 /* both are valid and point at the same path. that is, we are
2724 * dealing with a change.
2725 */
2726 if (one->sha1_valid && two->sha1_valid &&
a89fccd2 2727 !hashcmp(one->sha1, two->sha1))
6973dcae
JH
2728 return 1; /* no change */
2729 if (!one->sha1_valid && !two->sha1_valid)
2730 return 1; /* both look at the same file on the filesystem. */
2731 return 0;
2732}
2733
2734static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2735{
2736 if (diff_unmodified_pair(p))
2737 return;
2738
2739 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2740 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2741 return; /* no tree diffs in patch format */
2742
2743 run_diff(p, o);
2744}
2745
2746static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2747 struct diffstat_t *diffstat)
2748{
2749 if (diff_unmodified_pair(p))
2750 return;
2751
2752 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2753 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2754 return; /* no tree diffs in patch format */
2755
2756 run_diffstat(p, o, diffstat);
2757}
2758
88246898
JS
2759static void diff_flush_checkdiff(struct diff_filepair *p,
2760 struct diff_options *o)
2761{
2762 if (diff_unmodified_pair(p))
2763 return;
2764
2765 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2766 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2767 return; /* no tree diffs in patch format */
2768
2769 run_checkdiff(p, o);
2770}
2771
6973dcae
JH
2772int diff_queue_is_empty(void)
2773{
2774 struct diff_queue_struct *q = &diff_queued_diff;
2775 int i;
2776 for (i = 0; i < q->nr; i++)
2777 if (!diff_unmodified_pair(q->queue[i]))
2778 return 0;
2779 return 1;
2780}
2781
2782#if DIFF_DEBUG
2783void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2784{
2785 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2786 x, one ? one : "",
2787 s->path,
2788 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2789 s->mode,
2790 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2791 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2792 x, one ? one : "",
2793 s->size, s->xfrm_flags);
2794}
2795
2796void diff_debug_filepair(const struct diff_filepair *p, int i)
2797{
2798 diff_debug_filespec(p->one, i, "one");
2799 diff_debug_filespec(p->two, i, "two");
64479711 2800 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
6973dcae 2801 p->score, p->status ? p->status : '?',
64479711 2802 p->one->rename_used, p->broken_pair);
6973dcae
JH
2803}
2804
2805void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2806{
2807 int i;
2808 if (msg)
2809 fprintf(stderr, "%s\n", msg);
2810 fprintf(stderr, "q->nr = %d\n", q->nr);
2811 for (i = 0; i < q->nr; i++) {
2812 struct diff_filepair *p = q->queue[i];
2813 diff_debug_filepair(p, i);
2814 }
2815}
2816#endif
2817
2818static void diff_resolve_rename_copy(void)
2819{
64479711
LT
2820 int i;
2821 struct diff_filepair *p;
6973dcae
JH
2822 struct diff_queue_struct *q = &diff_queued_diff;
2823
2824 diff_debug_queue("resolve-rename-copy", q);
2825
2826 for (i = 0; i < q->nr; i++) {
2827 p = q->queue[i];
2828 p->status = 0; /* undecided */
2829 if (DIFF_PAIR_UNMERGED(p))
2830 p->status = DIFF_STATUS_UNMERGED;
2831 else if (!DIFF_FILE_VALID(p->one))
2832 p->status = DIFF_STATUS_ADDED;
2833 else if (!DIFF_FILE_VALID(p->two))
2834 p->status = DIFF_STATUS_DELETED;
2835 else if (DIFF_PAIR_TYPE_CHANGED(p))
2836 p->status = DIFF_STATUS_TYPE_CHANGED;
2837
2838 /* from this point on, we are dealing with a pair
2839 * whose both sides are valid and of the same type, i.e.
2840 * either in-place edit or rename/copy edit.
2841 */
2842 else if (DIFF_PAIR_RENAME(p)) {
64479711
LT
2843 /*
2844 * A rename might have re-connected a broken
2845 * pair up, causing the pathnames to be the
2846 * same again. If so, that's not a rename at
2847 * all, just a modification..
2848 *
2849 * Otherwise, see if this source was used for
2850 * multiple renames, in which case we decrement
2851 * the count, and call it a copy.
6973dcae 2852 */
64479711
LT
2853 if (!strcmp(p->one->path, p->two->path))
2854 p->status = DIFF_STATUS_MODIFIED;
2855 else if (--p->one->rename_used > 0)
6973dcae 2856 p->status = DIFF_STATUS_COPIED;
64479711 2857 else
6973dcae
JH
2858 p->status = DIFF_STATUS_RENAMED;
2859 }
a89fccd2 2860 else if (hashcmp(p->one->sha1, p->two->sha1) ||
d516c2d1
JS
2861 p->one->mode != p->two->mode ||
2862 is_null_sha1(p->one->sha1))
6973dcae
JH
2863 p->status = DIFF_STATUS_MODIFIED;
2864 else {
2865 /* This is a "no-change" entry and should not
2866 * happen anymore, but prepare for broken callers.
2867 */
2868 error("feeding unmodified %s to diffcore",
2869 p->one->path);
2870 p->status = DIFF_STATUS_UNKNOWN;
2871 }
2872 }
2873 diff_debug_queue("resolve-rename-copy done", q);
2874}
2875
c6744349 2876static int check_pair_status(struct diff_filepair *p)
6973dcae 2877{
6973dcae
JH
2878 switch (p->status) {
2879 case DIFF_STATUS_UNKNOWN:
c6744349 2880 return 0;
6973dcae
JH
2881 case 0:
2882 die("internal error in diff-resolve-rename-copy");
6973dcae 2883 default:
c6744349 2884 return 1;
6973dcae
JH
2885 }
2886}
2887
c6744349
TH
2888static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2889{
2890 int fmt = opt->output_format;
2891
2892 if (fmt & DIFF_FORMAT_CHECKDIFF)
2893 diff_flush_checkdiff(p, opt);
2894 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2895 diff_flush_raw(p, opt);
cd676a51
JH
2896 else if (fmt & DIFF_FORMAT_NAME) {
2897 const char *name_a, *name_b;
2898 name_a = p->two->path;
2899 name_b = NULL;
2900 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734 2901 write_name_quoted(name_a, opt->file, opt->line_termination);
cd676a51 2902 }
c6744349
TH
2903}
2904
c0c77734 2905static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4bbd261b
SE
2906{
2907 if (fs->mode)
c0c77734 2908 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4bbd261b 2909 else
c0c77734
DB
2910 fprintf(file, " %s ", newdelete);
2911 write_name_quoted(fs->path, file, '\n');
4bbd261b
SE
2912}
2913
2914
c0c77734 2915static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
4bbd261b
SE
2916{
2917 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
c0c77734 2918 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
663af342 2919 show_name ? ' ' : '\n');
0d26a64e 2920 if (show_name) {
c0c77734 2921 write_name_quoted(p->two->path, file, '\n');
0d26a64e 2922 }
4bbd261b
SE
2923 }
2924}
2925
c0c77734 2926static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
4bbd261b 2927{
b9f44164 2928 char *names = pprint_rename(p->one->path, p->two->path);
4bbd261b 2929
c0c77734 2930 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
b9f44164 2931 free(names);
c0c77734 2932 show_mode_change(file, p, 0);
4bbd261b
SE
2933}
2934
c0c77734 2935static void diff_summary(FILE *file, struct diff_filepair *p)
4bbd261b
SE
2936{
2937 switch(p->status) {
2938 case DIFF_STATUS_DELETED:
c0c77734 2939 show_file_mode_name(file, "delete", p->one);
4bbd261b
SE
2940 break;
2941 case DIFF_STATUS_ADDED:
c0c77734 2942 show_file_mode_name(file, "create", p->two);
4bbd261b
SE
2943 break;
2944 case DIFF_STATUS_COPIED:
c0c77734 2945 show_rename_copy(file, "copy", p);
4bbd261b
SE
2946 break;
2947 case DIFF_STATUS_RENAMED:
c0c77734 2948 show_rename_copy(file, "rename", p);
4bbd261b
SE
2949 break;
2950 default:
2951 if (p->score) {
c0c77734
DB
2952 fputs(" rewrite ", file);
2953 write_name_quoted(p->two->path, file, ' ');
2954 fprintf(file, "(%d%%)\n", similarity_index(p));
663af342 2955 }
c0c77734 2956 show_mode_change(file, p, !p->score);
4bbd261b
SE
2957 break;
2958 }
2959}
2960
fcb3d0ad 2961struct patch_id_t {
9126f009 2962 git_SHA_CTX *ctx;
fcb3d0ad
JS
2963 int patchlen;
2964};
2965
2966static int remove_space(char *line, int len)
2967{
2968 int i;
663af342
PH
2969 char *dst = line;
2970 unsigned char c;
fcb3d0ad 2971
663af342
PH
2972 for (i = 0; i < len; i++)
2973 if (!isspace((c = line[i])))
2974 *dst++ = c;
fcb3d0ad 2975
663af342 2976 return dst - line;
fcb3d0ad
JS
2977}
2978
2979static void patch_id_consume(void *priv, char *line, unsigned long len)
2980{
2981 struct patch_id_t *data = priv;
2982 int new_len;
2983
2984 /* Ignore line numbers when computing the SHA1 of the patch */
cc44c765 2985 if (!prefixcmp(line, "@@ -"))
fcb3d0ad
JS
2986 return;
2987
2988 new_len = remove_space(line, len);
2989
9126f009 2990 git_SHA1_Update(data->ctx, line, new_len);
fcb3d0ad
JS
2991 data->patchlen += new_len;
2992}
2993
2994/* returns 0 upon success, and writes result into sha1 */
2995static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2996{
2997 struct diff_queue_struct *q = &diff_queued_diff;
2998 int i;
9126f009 2999 git_SHA_CTX ctx;
fcb3d0ad
JS
3000 struct patch_id_t data;
3001 char buffer[PATH_MAX * 4 + 20];
3002
9126f009 3003 git_SHA1_Init(&ctx);
fcb3d0ad
JS
3004 memset(&data, 0, sizeof(struct patch_id_t));
3005 data.ctx = &ctx;
fcb3d0ad
JS
3006
3007 for (i = 0; i < q->nr; i++) {
3008 xpparam_t xpp;
3009 xdemitconf_t xecfg;
3010 xdemitcb_t ecb;
3011 mmfile_t mf1, mf2;
3012 struct diff_filepair *p = q->queue[i];
3013 int len1, len2;
3014
9ccd0a88 3015 memset(&xpp, 0, sizeof(xpp));
30b25010 3016 memset(&xecfg, 0, sizeof(xecfg));
fcb3d0ad
JS
3017 if (p->status == 0)
3018 return error("internal diff status error");
3019 if (p->status == DIFF_STATUS_UNKNOWN)
3020 continue;
3021 if (diff_unmodified_pair(p))
3022 continue;
3023 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3024 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3025 continue;
3026 if (DIFF_PAIR_UNMERGED(p))
3027 continue;
3028
3029 diff_fill_sha1_info(p->one);
3030 diff_fill_sha1_info(p->two);
3031 if (fill_mmfile(&mf1, p->one) < 0 ||
3032 fill_mmfile(&mf2, p->two) < 0)
3033 return error("unable to read files to diff");
3034
fcb3d0ad
JS
3035 len1 = remove_space(p->one->path, strlen(p->one->path));
3036 len2 = remove_space(p->two->path, strlen(p->two->path));
3037 if (p->one->mode == 0)
3038 len1 = snprintf(buffer, sizeof(buffer),
3039 "diff--gita/%.*sb/%.*s"
3040 "newfilemode%06o"
3041 "---/dev/null"
3042 "+++b/%.*s",
3043 len1, p->one->path,
3044 len2, p->two->path,
3045 p->two->mode,
3046 len2, p->two->path);
3047 else if (p->two->mode == 0)
3048 len1 = snprintf(buffer, sizeof(buffer),
3049 "diff--gita/%.*sb/%.*s"
3050 "deletedfilemode%06o"
3051 "---a/%.*s"
3052 "+++/dev/null",
3053 len1, p->one->path,
3054 len2, p->two->path,
3055 p->one->mode,
3056 len1, p->one->path);
3057 else
3058 len1 = snprintf(buffer, sizeof(buffer),
3059 "diff--gita/%.*sb/%.*s"
3060 "---a/%.*s"
3061 "+++b/%.*s",
3062 len1, p->one->path,
3063 len2, p->two->path,
3064 len1, p->one->path,
3065 len2, p->two->path);
9126f009 3066 git_SHA1_Update(&ctx, buffer, len1);
fcb3d0ad
JS
3067
3068 xpp.flags = XDF_NEED_MINIMAL;
3069 xecfg.ctxlen = 3;
9fdc3bb5 3070 xecfg.flags = XDL_EMIT_FUNCNAMES;
8a3f524b
JH
3071 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3072 &xpp, &xecfg, &ecb);
fcb3d0ad
JS
3073 }
3074
9126f009 3075 git_SHA1_Final(sha1, &ctx);
fcb3d0ad
JS
3076 return 0;
3077}
3078
3079int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3080{
3081 struct diff_queue_struct *q = &diff_queued_diff;
3082 int i;
3083 int result = diff_get_patch_id(options, sha1);
3084
3085 for (i = 0; i < q->nr; i++)
3086 diff_free_filepair(q->queue[i]);
3087
3088 free(q->queue);
3089 q->queue = NULL;
3090 q->nr = q->alloc = 0;
3091
3092 return result;
3093}
3094
946c3784 3095static int is_summary_empty(const struct diff_queue_struct *q)
6973dcae 3096{
6973dcae 3097 int i;
6973dcae 3098
946c3784
TH
3099 for (i = 0; i < q->nr; i++) {
3100 const struct diff_filepair *p = q->queue[i];
3101
3102 switch (p->status) {
3103 case DIFF_STATUS_DELETED:
3104 case DIFF_STATUS_ADDED:
3105 case DIFF_STATUS_COPIED:
3106 case DIFF_STATUS_RENAMED:
3107 return 0;
3108 default:
3109 if (p->score)
3110 return 0;
3111 if (p->one->mode && p->two->mode &&
3112 p->one->mode != p->two->mode)
3113 return 0;
3114 break;
3115 }
6973dcae 3116 }
946c3784
TH
3117 return 1;
3118}
3119
6973dcae
JH
3120void diff_flush(struct diff_options *options)
3121{
3122 struct diff_queue_struct *q = &diff_queued_diff;
c6744349 3123 int i, output_format = options->output_format;
946c3784 3124 int separator = 0;
6973dcae 3125
c6744349
TH
3126 /*
3127 * Order: raw, stat, summary, patch
3128 * or: name/name-status/checkdiff (other bits clear)
3129 */
946c3784
TH
3130 if (!q->nr)
3131 goto free_queue;
6973dcae 3132
c6744349
TH
3133 if (output_format & (DIFF_FORMAT_RAW |
3134 DIFF_FORMAT_NAME |
3135 DIFF_FORMAT_NAME_STATUS |
3136 DIFF_FORMAT_CHECKDIFF)) {
6973dcae
JH
3137 for (i = 0; i < q->nr; i++) {
3138 struct diff_filepair *p = q->queue[i];
c6744349
TH
3139 if (check_pair_status(p))
3140 flush_one_pair(p, options);
6973dcae 3141 }
946c3784 3142 separator++;
6973dcae 3143 }
c6744349 3144
c04a7155 3145 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
5e2b0636 3146 struct diffstat_t diffstat;
c6744349 3147
5e2b0636 3148 memset(&diffstat, 0, sizeof(struct diffstat_t));
6973dcae
JH
3149 for (i = 0; i < q->nr; i++) {
3150 struct diff_filepair *p = q->queue[i];
c6744349 3151 if (check_pair_status(p))
5e2b0636 3152 diff_flush_stat(p, options, &diffstat);
6973dcae 3153 }
74e2abe5
JH
3154 if (output_format & DIFF_FORMAT_NUMSTAT)
3155 show_numstat(&diffstat, options);
3156 if (output_format & DIFF_FORMAT_DIFFSTAT)
3157 show_stats(&diffstat, options);
f604652e 3158 if (output_format & DIFF_FORMAT_SHORTSTAT)
c0c77734 3159 show_shortstats(&diffstat, options);
f604652e 3160 free_diffstat_info(&diffstat);
3969cf7d 3161 separator++;
6973dcae 3162 }
c04a7155
JH
3163 if (output_format & DIFF_FORMAT_DIRSTAT)
3164 show_dirstat(options);
6973dcae 3165
946c3784 3166 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
c6744349 3167 for (i = 0; i < q->nr; i++)
c0c77734 3168 diff_summary(options->file, q->queue[i]);
3969cf7d 3169 separator++;
6973dcae
JH
3170 }
3171
c6744349 3172 if (output_format & DIFF_FORMAT_PATCH) {
946c3784 3173 if (separator) {
6b2fbaaf 3174 putc(options->line_termination, options->file);
946c3784
TH
3175 if (options->stat_sep) {
3176 /* attach patch instead of inline */
c0c77734 3177 fputs(options->stat_sep, options->file);
946c3784 3178 }
c6744349
TH
3179 }
3180
3181 for (i = 0; i < q->nr; i++) {
3182 struct diff_filepair *p = q->queue[i];
3183 if (check_pair_status(p))
3184 diff_flush_patch(p, options);
3185 }
4bbd261b
SE
3186 }
3187
04245581
JK
3188 if (output_format & DIFF_FORMAT_CALLBACK)
3189 options->format_callback(q, options, options->format_callback_data);
3190
c6744349
TH
3191 for (i = 0; i < q->nr; i++)
3192 diff_free_filepair(q->queue[i]);
946c3784 3193free_queue:
6973dcae
JH
3194 free(q->queue);
3195 q->queue = NULL;
3196 q->nr = q->alloc = 0;
c0c77734
DB
3197 if (options->close_file)
3198 fclose(options->file);
6973dcae
JH
3199}
3200
3201static void diffcore_apply_filter(const char *filter)
3202{
3203 int i;
3204 struct diff_queue_struct *q = &diff_queued_diff;
3205 struct diff_queue_struct outq;
3206 outq.queue = NULL;
3207 outq.nr = outq.alloc = 0;
3208
3209 if (!filter)
3210 return;
3211
3212 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3213 int found;
3214 for (i = found = 0; !found && i < q->nr; i++) {
3215 struct diff_filepair *p = q->queue[i];
3216 if (((p->status == DIFF_STATUS_MODIFIED) &&
3217 ((p->score &&
3218 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3219 (!p->score &&
3220 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3221 ((p->status != DIFF_STATUS_MODIFIED) &&
3222 strchr(filter, p->status)))
3223 found++;
3224 }
3225 if (found)
3226 return;
3227
3228 /* otherwise we will clear the whole queue
3229 * by copying the empty outq at the end of this
3230 * function, but first clear the current entries
3231 * in the queue.
3232 */
3233 for (i = 0; i < q->nr; i++)
3234 diff_free_filepair(q->queue[i]);
3235 }
3236 else {
3237 /* Only the matching ones */
3238 for (i = 0; i < q->nr; i++) {
3239 struct diff_filepair *p = q->queue[i];
3240
3241 if (((p->status == DIFF_STATUS_MODIFIED) &&
3242 ((p->score &&
3243 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3244 (!p->score &&
3245 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3246 ((p->status != DIFF_STATUS_MODIFIED) &&
3247 strchr(filter, p->status)))
3248 diff_q(&outq, p);
3249 else
3250 diff_free_filepair(p);
3251 }
3252 }
3253 free(q->queue);
3254 *q = outq;
3255}
3256
5701115a
SV
3257/* Check whether two filespecs with the same mode and size are identical */
3258static int diff_filespec_is_identical(struct diff_filespec *one,
3259 struct diff_filespec *two)
3260{
2b459b48
JH
3261 if (S_ISGITLINK(one->mode))
3262 return 0;
5701115a
SV
3263 if (diff_populate_filespec(one, 0))
3264 return 0;
3265 if (diff_populate_filespec(two, 0))
3266 return 0;
3267 return !memcmp(one->data, two->data, one->size);
3268}
3269
fb13227e
JH
3270static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3271{
3272 int i;
3273 struct diff_queue_struct *q = &diff_queued_diff;
3274 struct diff_queue_struct outq;
3275 outq.queue = NULL;
3276 outq.nr = outq.alloc = 0;
3277
3278 for (i = 0; i < q->nr; i++) {
3279 struct diff_filepair *p = q->queue[i];
3280
3281 /*
3282 * 1. Entries that come from stat info dirtyness
3283 * always have both sides (iow, not create/delete),
3284 * one side of the object name is unknown, with
3285 * the same mode and size. Keep the ones that
3286 * do not match these criteria. They have real
3287 * differences.
3288 *
3289 * 2. At this point, the file is known to be modified,
3290 * with the same mode and size, and the object
3291 * name of one side is unknown. Need to inspect
3292 * the identical contents.
3293 */
3294 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3295 !DIFF_FILE_VALID(p->two) ||
3296 (p->one->sha1_valid && p->two->sha1_valid) ||
3297 (p->one->mode != p->two->mode) ||
3298 diff_populate_filespec(p->one, 1) ||
3299 diff_populate_filespec(p->two, 1) ||
3300 (p->one->size != p->two->size) ||
5701115a 3301 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
fb13227e
JH
3302 diff_q(&outq, p);
3303 else {
3304 /*
3305 * The caller can subtract 1 from skip_stat_unmatch
3306 * to determine how many paths were dirty only
3307 * due to stat info mismatch.
3308 */
8f67f8ae 3309 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
6d2d9e86 3310 diffopt->skip_stat_unmatch++;
fb13227e
JH
3311 diff_free_filepair(p);
3312 }
3313 }
3314 free(q->queue);
3315 *q = outq;
3316}
3317
6973dcae
JH
3318void diffcore_std(struct diff_options *options)
3319{
9d865356 3320 if (options->skip_stat_unmatch)
fb13227e 3321 diffcore_skip_stat_unmatch(options);
6973dcae
JH
3322 if (options->break_opt != -1)
3323 diffcore_break(options->break_opt);
3324 if (options->detect_rename)
3325 diffcore_rename(options);
3326 if (options->break_opt != -1)
3327 diffcore_merge_broken();
3328 if (options->pickaxe)
3329 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3330 if (options->orderfile)
3331 diffcore_order(options->orderfile);
3332 diff_resolve_rename_copy();
3333 diffcore_apply_filter(options->filter);
68aacb2f 3334
8f67f8ae
PH
3335 if (diff_queued_diff.nr)
3336 DIFF_OPT_SET(options, HAS_CHANGES);
3337 else
3338 DIFF_OPT_CLR(options, HAS_CHANGES);
6973dcae
JH
3339}
3340
da31b358
JH
3341int diff_result_code(struct diff_options *opt, int status)
3342{
3343 int result = 0;
3344 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3345 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3346 return status;
3347 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3348 DIFF_OPT_TST(opt, HAS_CHANGES))
3349 result |= 01;
3350 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3351 DIFF_OPT_TST(opt, CHECK_FAILED))
3352 result |= 02;
3353 return result;
3354}
6973dcae 3355
6973dcae
JH
3356void diff_addremove(struct diff_options *options,
3357 int addremove, unsigned mode,
3358 const unsigned char *sha1,
fd55a19e 3359 const char *concatpath)
6973dcae 3360{
6973dcae
JH
3361 struct diff_filespec *one, *two;
3362
50fd9bd8
JS
3363 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3364 return;
3365
6973dcae
JH
3366 /* This may look odd, but it is a preparation for
3367 * feeding "there are unchanged files which should
3368 * not produce diffs, but when you are doing copy
3369 * detection you would need them, so here they are"
3370 * entries to the diff-core. They will be prefixed
3371 * with something like '=' or '*' (I haven't decided
3372 * which but should not make any difference).
a6080a0a 3373 * Feeding the same new and old to diff_change()
6973dcae
JH
3374 * also has the same effect.
3375 * Before the final output happens, they are pruned after
3376 * merged into rename/copy pairs as appropriate.
3377 */
8f67f8ae 3378 if (DIFF_OPT_TST(options, REVERSE_DIFF))
6973dcae
JH
3379 addremove = (addremove == '+' ? '-' :
3380 addremove == '-' ? '+' : addremove);
3381
cd676a51
JH
3382 if (options->prefix &&
3383 strncmp(concatpath, options->prefix, options->prefix_length))
3384 return;
3385
6973dcae
JH
3386 one = alloc_filespec(concatpath);
3387 two = alloc_filespec(concatpath);
3388
3389 if (addremove != '+')
3390 fill_filespec(one, sha1, mode);
3391 if (addremove != '-')
3392 fill_filespec(two, sha1, mode);
3393
3394 diff_queue(&diff_queued_diff, one, two);
8f67f8ae 3395 DIFF_OPT_SET(options, HAS_CHANGES);
6973dcae
JH
3396}
3397
3398void diff_change(struct diff_options *options,
3399 unsigned old_mode, unsigned new_mode,
3400 const unsigned char *old_sha1,
3401 const unsigned char *new_sha1,
fd55a19e 3402 const char *concatpath)
6973dcae 3403{
6973dcae
JH
3404 struct diff_filespec *one, *two;
3405
50fd9bd8
JS
3406 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3407 && S_ISGITLINK(new_mode))
3408 return;
3409
8f67f8ae 3410 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
6973dcae
JH
3411 unsigned tmp;
3412 const unsigned char *tmp_c;
3413 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3414 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3415 }
cd676a51
JH
3416
3417 if (options->prefix &&
3418 strncmp(concatpath, options->prefix, options->prefix_length))
3419 return;
3420
6973dcae
JH
3421 one = alloc_filespec(concatpath);
3422 two = alloc_filespec(concatpath);
3423 fill_filespec(one, old_sha1, old_mode);
3424 fill_filespec(two, new_sha1, new_mode);
3425
3426 diff_queue(&diff_queued_diff, one, two);
8f67f8ae 3427 DIFF_OPT_SET(options, HAS_CHANGES);
6973dcae
JH
3428}
3429
3430void diff_unmerge(struct diff_options *options,
e9c84099
JH
3431 const char *path,
3432 unsigned mode, const unsigned char *sha1)
6973dcae
JH
3433{
3434 struct diff_filespec *one, *two;
cd676a51
JH
3435
3436 if (options->prefix &&
3437 strncmp(path, options->prefix, options->prefix_length))
3438 return;
3439
6973dcae
JH
3440 one = alloc_filespec(path);
3441 two = alloc_filespec(path);
e9c84099
JH
3442 fill_filespec(one, sha1, mode);
3443 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
6973dcae 3444}
9cb92c39
JK
3445
3446static char *run_textconv(const char *pgm, struct diff_filespec *spec,
3447 size_t *outsize)
3448{
3449 struct diff_tempfile temp;
3450 const char *argv[3];
3451 const char **arg = argv;
3452 struct child_process child;
3453 struct strbuf buf = STRBUF_INIT;
3454
3455 prepare_temp_file(spec->path, &temp, spec);
3456 *arg++ = pgm;
3457 *arg++ = temp.name;
3458 *arg = NULL;
3459
3460 memset(&child, 0, sizeof(child));
3461 child.argv = argv;
3462 child.out = -1;
3463 if (start_command(&child) != 0 ||
3464 strbuf_read(&buf, child.out, 0) < 0 ||
3465 finish_command(&child) != 0) {
3466 if (temp.name == temp.tmp_path)
3467 unlink(temp.name);
3468 error("error running textconv command '%s'", pgm);
3469 return NULL;
3470 }
3471 if (temp.name == temp.tmp_path)
3472 unlink(temp.name);
3473
3474 return strbuf_detach(&buf, outsize);
3475}