diff --cached: do not borrow from a work tree when a path is marked as assume-unchanged
[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"
6973dcae 14
1510fea7
SP
15#ifdef NO_FAST_WORKING_DIRECTORY
16#define FAST_WORKING_DIRECTORY 0
17#else
18#define FAST_WORKING_DIRECTORY 1
19#endif
20
96f1e58f 21static int diff_detect_rename_default;
50705915 22static int diff_rename_limit_default = 200;
6b2f2d98 23int diff_use_color_default = -1;
cbe02100 24static const char *external_diff_cmd_cfg;
aecbf914 25int diff_auto_refresh_index = 1;
6973dcae 26
7c92fe0e 27static char diff_colors[][COLOR_MAXLEN] = {
f37399e6 28 "\033[m", /* reset */
448c3ef1
JH
29 "", /* PLAIN (normal) */
30 "\033[1m", /* METAINFO (bold) */
31 "\033[36m", /* FRAGINFO (cyan) */
32 "\033[31m", /* OLD (red) */
33 "\033[32m", /* NEW (green) */
34 "\033[33m", /* COMMIT (yellow) */
35 "\033[41m", /* WHITESPACE (red background) */
cd112cef
JS
36};
37
801235c5
JH
38static int parse_diff_color_slot(const char *var, int ofs)
39{
40 if (!strcasecmp(var+ofs, "plain"))
41 return DIFF_PLAIN;
42 if (!strcasecmp(var+ofs, "meta"))
43 return DIFF_METAINFO;
44 if (!strcasecmp(var+ofs, "frag"))
45 return DIFF_FRAGINFO;
46 if (!strcasecmp(var+ofs, "old"))
47 return DIFF_FILE_OLD;
48 if (!strcasecmp(var+ofs, "new"))
49 return DIFF_FILE_NEW;
ce436973
JK
50 if (!strcasecmp(var+ofs, "commit"))
51 return DIFF_COMMIT;
448c3ef1
JH
52 if (!strcasecmp(var+ofs, "whitespace"))
53 return DIFF_WHITESPACE;
801235c5
JH
54 die("bad config variable '%s'", var);
55}
56
f1af60bd
JH
57static struct ll_diff_driver {
58 const char *name;
59 struct ll_diff_driver *next;
b20a60d0 60 const char *cmd;
f1af60bd
JH
61} *user_diff, **user_diff_tail;
62
63/*
64 * Currently there is only "diff.<drivername>.command" variable;
65 * because there are "diff.color.<slot>" variables, we are parsing
66 * this in a bit convoluted way to allow low level diff driver
67 * called "color".
68 */
69static int parse_lldiff_command(const char *var, const char *ep, const char *value)
70{
71 const char *name;
72 int namelen;
73 struct ll_diff_driver *drv;
74
75 name = var + 5;
76 namelen = ep - name;
77 for (drv = user_diff; drv; drv = drv->next)
78 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
79 break;
80 if (!drv) {
f1af60bd 81 drv = xcalloc(1, sizeof(struct ll_diff_driver));
182af834 82 drv->name = xmemdupz(name, namelen);
f1af60bd
JH
83 if (!user_diff_tail)
84 user_diff_tail = &user_diff;
85 *user_diff_tail = drv;
86 user_diff_tail = &(drv->next);
87 }
88
b20a60d0 89 return git_config_string(&(drv->cmd), var, value);
f1af60bd
JH
90}
91
e0e324a4
JH
92/*
93 * 'diff.<what>.funcname' attribute can be specified in the configuration
94 * to define a customized regexp to find the beginning of a function to
95 * be used for hunk header lines of "diff -p" style output.
96 */
97static struct funcname_pattern {
98 char *name;
99 char *pattern;
100 struct funcname_pattern *next;
101} *funcname_pattern_list;
102
103static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
104{
105 const char *name;
106 int namelen;
107 struct funcname_pattern *pp;
108
109 name = var + 5; /* "diff." */
110 namelen = ep - name;
111
112 for (pp = funcname_pattern_list; pp; pp = pp->next)
113 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
114 break;
115 if (!pp) {
e0e324a4 116 pp = xcalloc(1, sizeof(*pp));
182af834 117 pp->name = xmemdupz(name, namelen);
e0e324a4
JH
118 pp->next = funcname_pattern_list;
119 funcname_pattern_list = pp;
120 }
8e0f7003 121 free(pp->pattern);
e0e324a4
JH
122 pp->pattern = xstrdup(value);
123 return 0;
124}
125
83ad63cf
JH
126/*
127 * These are to give UI layer defaults.
128 * The core-level commands such as git-diff-files should
129 * never be affected by the setting of diff.renames
130 * the user happens to have in the configuration file.
131 */
ef90d6d4 132int git_diff_ui_config(const char *var, const char *value, void *cb)
801235c5 133{
a159ca0c 134 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
0f6f5a40 135 diff_use_color_default = git_config_colorbool(var, value, -1);
801235c5
JH
136 return 0;
137 }
b68ea12e
EW
138 if (!strcmp(var, "diff.renames")) {
139 if (!value)
140 diff_detect_rename_default = DIFF_DETECT_RENAME;
141 else if (!strcasecmp(value, "copies") ||
142 !strcasecmp(value, "copy"))
143 diff_detect_rename_default = DIFF_DETECT_COPY;
144 else if (git_config_bool(var,value))
145 diff_detect_rename_default = DIFF_DETECT_RENAME;
146 return 0;
147 }
aecbf914
JH
148 if (!strcmp(var, "diff.autorefreshindex")) {
149 diff_auto_refresh_index = git_config_bool(var, value);
150 return 0;
151 }
daec808c
BH
152 if (!strcmp(var, "diff.external"))
153 return git_config_string(&external_diff_cmd_cfg, var, value);
f1af60bd
JH
154 if (!prefixcmp(var, "diff.")) {
155 const char *ep = strrchr(var, '.');
156
2c778210
CC
157 if (ep != var + 4 && !strcmp(ep, ".command"))
158 return parse_lldiff_command(var, ep, value);
f1af60bd 159 }
9a1805a8 160
ef90d6d4 161 return git_diff_basic_config(var, value, cb);
9a1805a8
JK
162}
163
ef90d6d4 164int git_diff_basic_config(const char *var, const char *value, void *cb)
9a1805a8 165{
2b6ca6df
LT
166 if (!strcmp(var, "diff.renamelimit")) {
167 diff_rename_limit_default = git_config_int(var, value);
168 return 0;
169 }
170
1968d77d 171 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
801235c5 172 int slot = parse_diff_color_slot(var, 11);
64f30e94
JH
173 if (!value)
174 return config_error_nonbool(var);
7c92fe0e 175 color_parse(value, var, diff_colors[slot]);
801235c5
JH
176 return 0;
177 }
f1af60bd 178
e467193f
JK
179 if (!prefixcmp(var, "diff.")) {
180 const char *ep = strrchr(var, '.');
181 if (ep != var + 4) {
64f30e94
JH
182 if (!strcmp(ep, ".funcname")) {
183 if (!value)
184 return config_error_nonbool(var);
e467193f 185 return parse_funcname_pattern(var, ep, value);
64f30e94 186 }
e467193f
JK
187 }
188 }
189
ef90d6d4 190 return git_color_default_config(var, value, cb);
801235c5
JH
191}
192
6973dcae
JH
193static char *quote_two(const char *one, const char *two)
194{
195 int need_one = quote_c_style(one, NULL, NULL, 1);
196 int need_two = quote_c_style(two, NULL, NULL, 1);
663af342 197 struct strbuf res;
6973dcae 198
663af342 199 strbuf_init(&res, 0);
6973dcae 200 if (need_one + need_two) {
663af342
PH
201 strbuf_addch(&res, '"');
202 quote_c_style(one, &res, NULL, 1);
203 quote_c_style(two, &res, NULL, 1);
204 strbuf_addch(&res, '"');
205 } else {
206 strbuf_addstr(&res, one);
207 strbuf_addstr(&res, two);
6973dcae 208 }
b315c5c0 209 return strbuf_detach(&res, NULL);
6973dcae
JH
210}
211
212static const char *external_diff(void)
213{
214 static const char *external_diff_cmd = NULL;
215 static int done_preparing = 0;
216
217 if (done_preparing)
218 return external_diff_cmd;
219 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
cbe02100
JS
220 if (!external_diff_cmd)
221 external_diff_cmd = external_diff_cmd_cfg;
6973dcae
JH
222 done_preparing = 1;
223 return external_diff_cmd;
224}
225
6973dcae
JH
226static struct diff_tempfile {
227 const char *name; /* filename external diff should read from */
228 char hex[41];
229 char mode[10];
1472966c 230 char tmp_path[PATH_MAX];
6973dcae
JH
231} diff_temp[2];
232
233static int count_lines(const char *data, int size)
234{
235 int count, ch, completely_empty = 1, nl_just_seen = 0;
236 count = 0;
237 while (0 < size--) {
238 ch = *data++;
239 if (ch == '\n') {
240 count++;
241 nl_just_seen = 1;
242 completely_empty = 0;
243 }
244 else {
245 nl_just_seen = 0;
246 completely_empty = 0;
247 }
248 }
249 if (completely_empty)
250 return 0;
251 if (!nl_just_seen)
252 count++; /* no trailing newline */
253 return count;
254}
255
c0c77734 256static void print_line_count(FILE *file, int count)
6973dcae
JH
257{
258 switch (count) {
259 case 0:
c0c77734 260 fprintf(file, "0,0");
6973dcae
JH
261 break;
262 case 1:
c0c77734 263 fprintf(file, "1");
6973dcae
JH
264 break;
265 default:
c0c77734 266 fprintf(file, "1,%d", count);
6973dcae
JH
267 break;
268 }
269}
270
c0c77734
DB
271static void copy_file_with_prefix(FILE *file,
272 int prefix, const char *data, int size,
1468bd47 273 const char *set, const char *reset)
6973dcae
JH
274{
275 int ch, nl_just_seen = 1;
276 while (0 < size--) {
277 ch = *data++;
13e36ec5 278 if (nl_just_seen) {
c0c77734
DB
279 fputs(set, file);
280 putc(prefix, file);
13e36ec5
JS
281 }
282 if (ch == '\n') {
6973dcae 283 nl_just_seen = 1;
c0c77734 284 fputs(reset, file);
13e36ec5 285 } else
6973dcae 286 nl_just_seen = 0;
c0c77734 287 putc(ch, file);
6973dcae
JH
288 }
289 if (!nl_just_seen)
c0c77734 290 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
6973dcae
JH
291}
292
293static void emit_rewrite_diff(const char *name_a,
294 const char *name_b,
295 struct diff_filespec *one,
13e36ec5 296 struct diff_filespec *two,
eab9a40b 297 struct diff_options *o)
6973dcae
JH
298{
299 int lc_a, lc_b;
eab9a40b 300 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1a9eb3b9 301 const char *name_a_tab, *name_b_tab;
13e36ec5
JS
302 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
303 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
304 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
305 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
306 const char *reset = diff_get_color(color_diff, DIFF_RESET);
d5625091 307 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1a9eb3b9 308
8a13becc
JH
309 name_a += (*name_a == '/');
310 name_b += (*name_b == '/');
1a9eb3b9
JH
311 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
312 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
313
d5625091
JH
314 strbuf_reset(&a_name);
315 strbuf_reset(&b_name);
316 quote_two_c_style(&a_name, o->a_prefix, name_a, 0);
317 quote_two_c_style(&b_name, o->b_prefix, name_b, 0);
318
6973dcae
JH
319 diff_populate_filespec(one, 0);
320 diff_populate_filespec(two, 0);
321 lc_a = count_lines(one->data, one->size);
322 lc_b = count_lines(two->data, two->size);
c0c77734
DB
323 fprintf(o->file,
324 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
325 metainfo, a_name.buf, name_a_tab, reset,
326 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
327 print_line_count(o->file, lc_a);
328 fprintf(o->file, " +");
329 print_line_count(o->file, lc_b);
330 fprintf(o->file, " @@%s\n", reset);
6973dcae 331 if (lc_a)
c0c77734 332 copy_file_with_prefix(o->file, '-', one->data, one->size, old, reset);
6973dcae 333 if (lc_b)
c0c77734 334 copy_file_with_prefix(o->file, '+', two->data, two->size, new, reset);
6973dcae
JH
335}
336
337static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
338{
339 if (!DIFF_FILE_VALID(one)) {
d2543b8e 340 mf->ptr = (char *)""; /* does not matter */
6973dcae
JH
341 mf->size = 0;
342 return 0;
343 }
344 else if (diff_populate_filespec(one, 0))
345 return -1;
346 mf->ptr = one->data;
347 mf->size = one->size;
348 return 0;
349}
350
f59a59e2
JS
351struct diff_words_buffer {
352 mmfile_t text;
353 long alloc;
354 long current; /* output pointer */
355 int suppressed_newline;
356};
357
358static void diff_words_append(char *line, unsigned long len,
359 struct diff_words_buffer *buffer)
360{
361 if (buffer->text.size + len > buffer->alloc) {
362 buffer->alloc = (buffer->text.size + len) * 3 / 2;
363 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
364 }
365 line++;
366 len--;
367 memcpy(buffer->text.ptr + buffer->text.size, line, len);
368 buffer->text.size += len;
369}
370
371struct diff_words_data {
372 struct xdiff_emit_state xm;
373 struct diff_words_buffer minus, plus;
c0c77734 374 FILE *file;
f59a59e2
JS
375};
376
c0c77734 377static void print_word(FILE *file, struct diff_words_buffer *buffer, int len, int color,
f59a59e2
JS
378 int suppress_newline)
379{
380 const char *ptr;
381 int eol = 0;
382
383 if (len == 0)
384 return;
385
386 ptr = buffer->text.ptr + buffer->current;
387 buffer->current += len;
388
389 if (ptr[len - 1] == '\n') {
390 eol = 1;
391 len--;
392 }
393
c0c77734
DB
394 fputs(diff_get_color(1, color), file);
395 fwrite(ptr, len, 1, file);
396 fputs(diff_get_color(1, DIFF_RESET), file);
f59a59e2
JS
397
398 if (eol) {
399 if (suppress_newline)
400 buffer->suppressed_newline = 1;
401 else
c0c77734 402 putc('\n', file);
f59a59e2
JS
403 }
404}
405
406static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
407{
408 struct diff_words_data *diff_words = priv;
409
410 if (diff_words->minus.suppressed_newline) {
411 if (line[0] != '+')
c0c77734 412 putc('\n', diff_words->file);
f59a59e2
JS
413 diff_words->minus.suppressed_newline = 0;
414 }
415
416 len--;
417 switch (line[0]) {
418 case '-':
c0c77734
DB
419 print_word(diff_words->file,
420 &diff_words->minus, len, DIFF_FILE_OLD, 1);
f59a59e2
JS
421 break;
422 case '+':
c0c77734
DB
423 print_word(diff_words->file,
424 &diff_words->plus, len, DIFF_FILE_NEW, 0);
f59a59e2
JS
425 break;
426 case ' ':
c0c77734
DB
427 print_word(diff_words->file,
428 &diff_words->plus, len, DIFF_PLAIN, 0);
f59a59e2
JS
429 diff_words->minus.current += len;
430 break;
431 }
432}
433
434/* this executes the word diff on the accumulated buffers */
435static void diff_words_show(struct diff_words_data *diff_words)
436{
437 xpparam_t xpp;
438 xdemitconf_t xecfg;
439 xdemitcb_t ecb;
440 mmfile_t minus, plus;
441 int i;
442
30b25010 443 memset(&xecfg, 0, sizeof(xecfg));
f59a59e2
JS
444 minus.size = diff_words->minus.text.size;
445 minus.ptr = xmalloc(minus.size);
446 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
447 for (i = 0; i < minus.size; i++)
448 if (isspace(minus.ptr[i]))
449 minus.ptr[i] = '\n';
450 diff_words->minus.current = 0;
451
452 plus.size = diff_words->plus.text.size;
453 plus.ptr = xmalloc(plus.size);
454 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
455 for (i = 0; i < plus.size; i++)
456 if (isspace(plus.ptr[i]))
457 plus.ptr[i] = '\n';
458 diff_words->plus.current = 0;
459
460 xpp.flags = XDF_NEED_MINIMAL;
461 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
f59a59e2
JS
462 ecb.outf = xdiff_outf;
463 ecb.priv = diff_words;
464 diff_words->xm.consume = fn_out_diff_words_aux;
c279d7e9 465 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
f59a59e2
JS
466
467 free(minus.ptr);
468 free(plus.ptr);
469 diff_words->minus.text.size = diff_words->plus.text.size = 0;
470
471 if (diff_words->minus.suppressed_newline) {
c0c77734 472 putc('\n', diff_words->file);
f59a59e2
JS
473 diff_words->minus.suppressed_newline = 0;
474 }
475}
476
23707811
JH
477typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
478
6973dcae 479struct emit_callback {
cd112cef
JS
480 struct xdiff_emit_state xm;
481 int nparents, color_diff;
cf1b7869 482 unsigned ws_rule;
23707811 483 sane_truncate_fn truncate;
6973dcae 484 const char **label_path;
f59a59e2 485 struct diff_words_data *diff_words;
34a5e1a2 486 int *found_changesp;
c0c77734 487 FILE *file;
6973dcae
JH
488};
489
f59a59e2
JS
490static void free_diff_words_data(struct emit_callback *ecbdata)
491{
492 if (ecbdata->diff_words) {
493 /* flush buffers */
494 if (ecbdata->diff_words->minus.text.size ||
495 ecbdata->diff_words->plus.text.size)
496 diff_words_show(ecbdata->diff_words);
497
8e0f7003
JM
498 free (ecbdata->diff_words->minus.text.ptr);
499 free (ecbdata->diff_words->plus.text.ptr);
f59a59e2
JS
500 free(ecbdata->diff_words);
501 ecbdata->diff_words = NULL;
502 }
503}
504
ce436973 505const char *diff_get_color(int diff_use_color, enum color_diff ix)
cd112cef
JS
506{
507 if (diff_use_color)
50f575fc
LT
508 return diff_colors[ix];
509 return "";
cd112cef
JS
510}
511
c0c77734 512static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
448c3ef1 513{
4afbcab9
JH
514 int has_trailing_newline = (len > 0 && line[len-1] == '\n');
515 if (has_trailing_newline)
06ff64ae
SG
516 len--;
517
c0c77734
DB
518 fputs(set, file);
519 fwrite(line, len, 1, file);
520 fputs(reset, file);
4afbcab9
JH
521 if (has_trailing_newline)
522 fputc('\n', file);
448c3ef1
JH
523}
524
c5a8c3ec
JS
525static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
526{
527 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
528 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
529
530 if (!*ws)
c0c77734 531 emit_line(ecbdata->file, set, reset, line, len);
c1795bb0
WC
532 else {
533 /* Emit just the prefix, then the rest. */
c0c77734 534 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
8f8841e9
JH
535 ws_check_emit(line + ecbdata->nparents,
536 len - ecbdata->nparents, ecbdata->ws_rule,
537 ecbdata->file, set, reset, ws);
c1795bb0 538 }
c5a8c3ec
JS
539}
540
23707811
JH
541static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
542{
543 const char *cp;
544 unsigned long allot;
545 size_t l = len;
546
547 if (ecb->truncate)
548 return ecb->truncate(line, len);
549 cp = line;
550 allot = l;
551 while (0 < l) {
552 (void) utf8_width(&cp, &l);
553 if (!cp)
554 break; /* truncated in the middle? */
555 }
556 return allot - l;
557}
558
cd112cef 559static void fn_out_consume(void *priv, char *line, unsigned long len)
6973dcae
JH
560{
561 int i;
448c3ef1 562 int color;
6973dcae 563 struct emit_callback *ecbdata = priv;
472ca780
JK
564 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
565 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
ce436973 566 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
6973dcae 567
34a5e1a2
JS
568 *(ecbdata->found_changesp) = 1;
569
6973dcae 570 if (ecbdata->label_path[0]) {
1a9eb3b9
JH
571 const char *name_a_tab, *name_b_tab;
572
573 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
574 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
575
c0c77734
DB
576 fprintf(ecbdata->file, "%s--- %s%s%s\n",
577 meta, ecbdata->label_path[0], reset, name_a_tab);
578 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
579 meta, ecbdata->label_path[1], reset, name_b_tab);
6973dcae
JH
580 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
581 }
cd112cef
JS
582
583 /* This is not really necessary for now because
584 * this codepath only deals with two-way diffs.
585 */
586 for (i = 0; i < len && line[i] == '@'; i++)
587 ;
588 if (2 <= i && i < len && line[i] == ' ') {
589 ecbdata->nparents = i - 1;
23707811 590 len = sane_truncate_line(ecbdata, line, len);
c0c77734
DB
591 emit_line(ecbdata->file,
592 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
448c3ef1 593 reset, line, len);
23707811 594 if (line[len-1] != '\n')
c0c77734 595 putc('\n', ecbdata->file);
448c3ef1 596 return;
cd112cef 597 }
448c3ef1
JH
598
599 if (len < ecbdata->nparents) {
c0c77734 600 emit_line(ecbdata->file, reset, reset, line, len);
448c3ef1 601 return;
cd112cef 602 }
448c3ef1
JH
603
604 color = DIFF_PLAIN;
605 if (ecbdata->diff_words && ecbdata->nparents != 1)
606 /* fall back to normal diff */
607 free_diff_words_data(ecbdata);
608 if (ecbdata->diff_words) {
609 if (line[0] == '-') {
610 diff_words_append(line, len,
611 &ecbdata->diff_words->minus);
612 return;
613 } else if (line[0] == '+') {
614 diff_words_append(line, len,
615 &ecbdata->diff_words->plus);
616 return;
617 }
618 if (ecbdata->diff_words->minus.text.size ||
619 ecbdata->diff_words->plus.text.size)
620 diff_words_show(ecbdata->diff_words);
621 line++;
50f575fc 622 len--;
c0c77734 623 emit_line(ecbdata->file, plain, reset, line, len);
448c3ef1
JH
624 return;
625 }
626 for (i = 0; i < ecbdata->nparents && len; i++) {
627 if (line[i] == '-')
628 color = DIFF_FILE_OLD;
629 else if (line[i] == '+')
630 color = DIFF_FILE_NEW;
631 }
632
633 if (color != DIFF_FILE_NEW) {
c0c77734
DB
634 emit_line(ecbdata->file,
635 diff_get_color(ecbdata->color_diff, color),
448c3ef1
JH
636 reset, line, len);
637 return;
638 }
639 emit_add_line(reset, ecbdata, line, len);
6973dcae
JH
640}
641
642static char *pprint_rename(const char *a, const char *b)
643{
644 const char *old = a;
645 const char *new = b;
663af342 646 struct strbuf name;
6973dcae
JH
647 int pfx_length, sfx_length;
648 int len_a = strlen(a);
649 int len_b = strlen(b);
663af342 650 int a_midlen, b_midlen;
e5bfbf9b
AJ
651 int qlen_a = quote_c_style(a, NULL, NULL, 0);
652 int qlen_b = quote_c_style(b, NULL, NULL, 0);
653
663af342 654 strbuf_init(&name, 0);
e5bfbf9b 655 if (qlen_a || qlen_b) {
663af342
PH
656 quote_c_style(a, &name, NULL, 0);
657 strbuf_addstr(&name, " => ");
658 quote_c_style(b, &name, NULL, 0);
b315c5c0 659 return strbuf_detach(&name, NULL);
e5bfbf9b 660 }
6973dcae
JH
661
662 /* Find common prefix */
663 pfx_length = 0;
664 while (*old && *new && *old == *new) {
665 if (*old == '/')
666 pfx_length = old - a + 1;
667 old++;
668 new++;
669 }
670
671 /* Find common suffix */
672 old = a + len_a;
673 new = b + len_b;
674 sfx_length = 0;
675 while (a <= old && b <= new && *old == *new) {
676 if (*old == '/')
677 sfx_length = len_a - (old - a);
678 old--;
679 new--;
680 }
681
682 /*
683 * pfx{mid-a => mid-b}sfx
684 * {pfx-a => pfx-b}sfx
685 * pfx{sfx-a => sfx-b}
686 * name-a => name-b
687 */
663af342
PH
688 a_midlen = len_a - pfx_length - sfx_length;
689 b_midlen = len_b - pfx_length - sfx_length;
690 if (a_midlen < 0)
691 a_midlen = 0;
692 if (b_midlen < 0)
693 b_midlen = 0;
694
695 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
6973dcae 696 if (pfx_length + sfx_length) {
663af342
PH
697 strbuf_add(&name, a, pfx_length);
698 strbuf_addch(&name, '{');
6973dcae 699 }
663af342
PH
700 strbuf_add(&name, a + pfx_length, a_midlen);
701 strbuf_addstr(&name, " => ");
702 strbuf_add(&name, b + pfx_length, b_midlen);
703 if (pfx_length + sfx_length) {
704 strbuf_addch(&name, '}');
705 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
6973dcae 706 }
b315c5c0 707 return strbuf_detach(&name, NULL);
6973dcae
JH
708}
709
710struct diffstat_t {
711 struct xdiff_emit_state xm;
712
713 int nr;
714 int alloc;
715 struct diffstat_file {
f604652e 716 char *from_name;
6973dcae 717 char *name;
f604652e 718 char *print_name;
6973dcae
JH
719 unsigned is_unmerged:1;
720 unsigned is_binary:1;
721 unsigned is_renamed:1;
722 unsigned int added, deleted;
723 } **files;
724};
725
726static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
727 const char *name_a,
728 const char *name_b)
729{
730 struct diffstat_file *x;
731 x = xcalloc(sizeof (*x), 1);
732 if (diffstat->nr == diffstat->alloc) {
733 diffstat->alloc = alloc_nr(diffstat->alloc);
734 diffstat->files = xrealloc(diffstat->files,
735 diffstat->alloc * sizeof(x));
736 }
737 diffstat->files[diffstat->nr++] = x;
738 if (name_b) {
f604652e
JH
739 x->from_name = xstrdup(name_a);
740 x->name = xstrdup(name_b);
6973dcae
JH
741 x->is_renamed = 1;
742 }
f604652e
JH
743 else {
744 x->from_name = NULL;
9befac47 745 x->name = xstrdup(name_a);
f604652e 746 }
6973dcae
JH
747 return x;
748}
749
750static void diffstat_consume(void *priv, char *line, unsigned long len)
751{
752 struct diffstat_t *diffstat = priv;
753 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
754
755 if (line[0] == '+')
756 x->added++;
757 else if (line[0] == '-')
758 x->deleted++;
759}
760
698ce6f8 761const char mime_boundary_leader[] = "------------";
6973dcae 762
a2540023
JH
763static int scale_linear(int it, int width, int max_change)
764{
765 /*
3ed74e60
JS
766 * make sure that at least one '-' is printed if there were deletions,
767 * and likewise for '+'.
a2540023 768 */
3ed74e60
JS
769 if (max_change < 2)
770 return it;
771 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
a2540023
JH
772}
773
c0c77734
DB
774static void show_name(FILE *file,
775 const char *prefix, const char *name, int len,
785f7432 776 const char *reset, const char *set)
a2540023 777{
c0c77734 778 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
a2540023
JH
779}
780
c0c77734 781static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
a2540023
JH
782{
783 if (cnt <= 0)
784 return;
c0c77734 785 fprintf(file, "%s", set);
a2540023 786 while (cnt--)
c0c77734
DB
787 putc(ch, file);
788 fprintf(file, "%s", reset);
a2540023
JH
789}
790
f604652e
JH
791static void fill_print_name(struct diffstat_file *file)
792{
793 char *pname;
794
795 if (file->print_name)
796 return;
797
798 if (!file->is_renamed) {
799 struct strbuf buf;
800 strbuf_init(&buf, 0);
801 if (quote_c_style(file->name, &buf, NULL, 0)) {
802 pname = strbuf_detach(&buf, NULL);
803 } else {
804 pname = file->name;
805 strbuf_release(&buf);
806 }
807 } else {
808 pname = pprint_rename(file->from_name, file->name);
809 }
810 file->print_name = pname;
811}
812
a2540023 813static void show_stats(struct diffstat_t* data, struct diff_options *options)
6973dcae 814{
6973dcae 815 int i, len, add, del, total, adds = 0, dels = 0;
a2540023 816 int max_change = 0, max_len = 0;
6973dcae 817 int total_files = data->nr;
a2540023 818 int width, name_width;
785f7432 819 const char *reset, *set, *add_c, *del_c;
6973dcae
JH
820
821 if (data->nr == 0)
822 return;
823
a2540023
JH
824 width = options->stat_width ? options->stat_width : 80;
825 name_width = options->stat_name_width ? options->stat_name_width : 50;
826
827 /* Sanity: give at least 5 columns to the graph,
828 * but leave at least 10 columns for the name.
829 */
861d1af3
OM
830 if (width < 25)
831 width = 25;
832 if (name_width < 10)
833 name_width = 10;
834 else if (width < name_width + 15)
835 name_width = width - 15;
a2540023
JH
836
837 /* Find the longest filename and max number of changes */
8f67f8ae
PH
838 reset = diff_get_color_opt(options, DIFF_RESET);
839 set = diff_get_color_opt(options, DIFF_PLAIN);
840 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
841 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
785f7432 842
6973dcae
JH
843 for (i = 0; i < data->nr; i++) {
844 struct diffstat_file *file = data->files[i];
a2540023 845 int change = file->added + file->deleted;
f604652e
JH
846 fill_print_name(file);
847 len = strlen(file->print_name);
6973dcae
JH
848 if (max_len < len)
849 max_len = len;
850
851 if (file->is_binary || file->is_unmerged)
852 continue;
a2540023
JH
853 if (max_change < change)
854 max_change = change;
6973dcae
JH
855 }
856
a2540023
JH
857 /* Compute the width of the graph part;
858 * 10 is for one blank at the beginning of the line plus
859 * " | count " between the name and the graph.
860 *
861 * From here on, name_width is the width of the name area,
862 * and width is the width of the graph area.
863 */
864 name_width = (name_width < max_len) ? name_width : max_len;
865 if (width < (name_width + 10) + max_change)
866 width = width - (name_width + 10);
867 else
868 width = max_change;
869
6973dcae 870 for (i = 0; i < data->nr; i++) {
d2543b8e 871 const char *prefix = "";
f604652e 872 char *name = data->files[i]->print_name;
6973dcae
JH
873 int added = data->files[i]->added;
874 int deleted = data->files[i]->deleted;
a2540023 875 int name_len;
6973dcae
JH
876
877 /*
878 * "scale" the filename
879 */
a2540023
JH
880 len = name_width;
881 name_len = strlen(name);
882 if (name_width < name_len) {
6973dcae
JH
883 char *slash;
884 prefix = "...";
a2540023
JH
885 len -= 3;
886 name += name_len - len;
6973dcae
JH
887 slash = strchr(name, '/');
888 if (slash)
889 name = slash;
890 }
6973dcae
JH
891
892 if (data->files[i]->is_binary) {
c0c77734
DB
893 show_name(options->file, prefix, name, len, reset, set);
894 fprintf(options->file, " Bin ");
895 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
896 fprintf(options->file, " -> ");
897 fprintf(options->file, "%s%d%s", add_c, added, reset);
898 fprintf(options->file, " bytes");
899 fprintf(options->file, "\n");
f604652e 900 continue;
6973dcae
JH
901 }
902 else if (data->files[i]->is_unmerged) {
c0c77734
DB
903 show_name(options->file, prefix, name, len, reset, set);
904 fprintf(options->file, " Unmerged\n");
f604652e 905 continue;
6973dcae
JH
906 }
907 else if (!data->files[i]->is_renamed &&
908 (added + deleted == 0)) {
909 total_files--;
f604652e 910 continue;
6973dcae
JH
911 }
912
a2540023
JH
913 /*
914 * scale the add/delete
915 */
6973dcae
JH
916 add = added;
917 del = deleted;
918 total = add + del;
919 adds += add;
920 dels += del;
921
a2540023 922 if (width <= max_change) {
a2540023 923 add = scale_linear(add, width, max_change);
3ed74e60
JS
924 del = scale_linear(del, width, max_change);
925 total = add + del;
6973dcae 926 }
c0c77734 927 show_name(options->file, prefix, name, len, reset, set);
4d9b5359
JK
928 fprintf(options->file, "%5d%s", added + deleted,
929 added + deleted ? " " : "");
c0c77734
DB
930 show_graph(options->file, '+', add, add_c, reset);
931 show_graph(options->file, '-', del, del_c, reset);
932 fprintf(options->file, "\n");
933 }
934 fprintf(options->file,
935 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
785f7432 936 set, total_files, adds, dels, reset);
6973dcae
JH
937}
938
c0c77734 939static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
ebd124c6
NP
940{
941 int i, adds = 0, dels = 0, total_files = data->nr;
942
943 if (data->nr == 0)
944 return;
945
946 for (i = 0; i < data->nr; i++) {
947 if (!data->files[i]->is_binary &&
948 !data->files[i]->is_unmerged) {
949 int added = data->files[i]->added;
950 int deleted= data->files[i]->deleted;
951 if (!data->files[i]->is_renamed &&
952 (added + deleted == 0)) {
953 total_files--;
954 } else {
955 adds += added;
956 dels += deleted;
957 }
958 }
ebd124c6 959 }
c0c77734 960 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
ebd124c6
NP
961 total_files, adds, dels);
962}
963
74e2abe5
JH
964static void show_numstat(struct diffstat_t* data, struct diff_options *options)
965{
966 int i;
967
f604652e
JH
968 if (data->nr == 0)
969 return;
970
74e2abe5
JH
971 for (i = 0; i < data->nr; i++) {
972 struct diffstat_file *file = data->files[i];
973
bfddbc5e 974 if (file->is_binary)
c0c77734 975 fprintf(options->file, "-\t-\t");
bfddbc5e 976 else
c0c77734
DB
977 fprintf(options->file,
978 "%d\t%d\t", file->added, file->deleted);
f604652e
JH
979 if (options->line_termination) {
980 fill_print_name(file);
981 if (!file->is_renamed)
c0c77734 982 write_name_quoted(file->name, options->file,
f604652e
JH
983 options->line_termination);
984 else {
c0c77734
DB
985 fputs(file->print_name, options->file);
986 putc(options->line_termination, options->file);
f604652e 987 }
663af342 988 } else {
f604652e 989 if (file->is_renamed) {
c0c77734
DB
990 putc('\0', options->file);
991 write_name_quoted(file->from_name, options->file, '\0');
f604652e 992 }
c0c77734 993 write_name_quoted(file->name, options->file, '\0');
663af342 994 }
74e2abe5
JH
995 }
996}
997
c04a7155
JH
998struct dirstat_file {
999 const char *name;
1000 unsigned long changed;
7df7c019
LT
1001};
1002
c04a7155
JH
1003struct dirstat_dir {
1004 struct dirstat_file *files;
1005 int alloc, nr, percent, cumulative;
1006};
1007
1008static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
7df7c019
LT
1009{
1010 unsigned long this_dir = 0;
1011 unsigned int sources = 0;
1012
1013 while (dir->nr) {
c04a7155 1014 struct dirstat_file *f = dir->files;
7df7c019
LT
1015 int namelen = strlen(f->name);
1016 unsigned long this;
1017 char *slash;
1018
1019 if (namelen < baselen)
1020 break;
1021 if (memcmp(f->name, base, baselen))
1022 break;
1023 slash = strchr(f->name + baselen, '/');
1024 if (slash) {
1025 int newbaselen = slash + 1 - f->name;
c0c77734 1026 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
7df7c019
LT
1027 sources++;
1028 } else {
c04a7155 1029 this = f->changed;
7df7c019
LT
1030 dir->files++;
1031 dir->nr--;
1032 sources += 2;
1033 }
1034 this_dir += this;
1035 }
1036
1037 /*
1038 * We don't report dirstat's for
1039 * - the top level
1040 * - or cases where everything came from a single directory
1041 * under this directory (sources == 1).
1042 */
1043 if (baselen && sources != 1) {
1044 int permille = this_dir * 1000 / changed;
1045 if (permille) {
1046 int percent = permille / 10;
1047 if (percent >= dir->percent) {
c0c77734 1048 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
7df7c019
LT
1049 if (!dir->cumulative)
1050 return 0;
1051 }
1052 }
1053 }
1054 return this_dir;
1055}
1056
c04a7155 1057static void show_dirstat(struct diff_options *options)
7df7c019
LT
1058{
1059 int i;
1060 unsigned long changed;
c04a7155
JH
1061 struct dirstat_dir dir;
1062 struct diff_queue_struct *q = &diff_queued_diff;
1063
1064 dir.files = NULL;
1065 dir.alloc = 0;
1066 dir.nr = 0;
1067 dir.percent = options->dirstat_percent;
1068 dir.cumulative = options->output_format & DIFF_FORMAT_CUMULATIVE;
7df7c019 1069
7df7c019 1070 changed = 0;
c04a7155
JH
1071 for (i = 0; i < q->nr; i++) {
1072 struct diff_filepair *p = q->queue[i];
1073 const char *name;
1074 unsigned long copied, added, damage;
1075
1076 name = p->one->path ? p->one->path : p->two->path;
1077
1078 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1079 diff_populate_filespec(p->one, 0);
1080 diff_populate_filespec(p->two, 0);
1081 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1082 &copied, &added);
1083 diff_free_filespec_data(p->one);
1084 diff_free_filespec_data(p->two);
1085 } else if (DIFF_FILE_VALID(p->one)) {
1086 diff_populate_filespec(p->one, 1);
1087 copied = added = 0;
1088 diff_free_filespec_data(p->one);
1089 } else if (DIFF_FILE_VALID(p->two)) {
1090 diff_populate_filespec(p->two, 1);
1091 copied = 0;
1092 added = p->two->size;
1093 diff_free_filespec_data(p->two);
1094 } else
2b0b551d 1095 continue;
c04a7155
JH
1096
1097 /*
1098 * Original minus copied is the removed material,
1099 * added is the new material. They are both damages
1100 * made to the preimage.
1101 */
1102 damage = (p->one->size - copied) + added;
1103
1104 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1105 dir.files[dir.nr].name = name;
1106 dir.files[dir.nr].changed = damage;
1107 changed += damage;
1108 dir.nr++;
7df7c019
LT
1109 }
1110
1111 /* This can happen even with many files, if everything was renames */
1112 if (!changed)
1113 return;
1114
1115 /* Show all directories with more than x% of the changes */
c0c77734 1116 gather_dirstat(options->file, &dir, changed, "", 0);
7df7c019
LT
1117}
1118
f604652e
JH
1119static void free_diffstat_info(struct diffstat_t *diffstat)
1120{
1121 int i;
1122 for (i = 0; i < diffstat->nr; i++) {
1123 struct diffstat_file *f = diffstat->files[i];
1124 if (f->name != f->print_name)
1125 free(f->print_name);
1126 free(f->name);
1127 free(f->from_name);
1128 free(f);
1129 }
1130 free(diffstat->files);
1131}
1132
88246898
JS
1133struct checkdiff_t {
1134 struct xdiff_emit_state xm;
1135 const char *filename;
1ba111d1
JH
1136 int lineno;
1137 struct diff_options *o;
cf1b7869 1138 unsigned ws_rule;
62c64895 1139 unsigned status;
877f23cc 1140 int trailing_blanks_start;
88246898
JS
1141};
1142
04954043
JH
1143static int is_conflict_marker(const char *line, unsigned long len)
1144{
1145 char firstchar;
1146 int cnt;
1147
1148 if (len < 8)
1149 return 0;
1150 firstchar = line[0];
1151 switch (firstchar) {
1152 case '=': case '>': case '<':
1153 break;
1154 default:
1155 return 0;
1156 }
1157 for (cnt = 1; cnt < 7; cnt++)
1158 if (line[cnt] != firstchar)
1159 return 0;
1160 /* line[0] thru line[6] are same as firstchar */
1161 if (firstchar == '=') {
1162 /* divider between ours and theirs? */
1163 if (len != 8 || line[7] != '\n')
1164 return 0;
1165 } else if (len < 8 || !isspace(line[7])) {
1166 /* not divider before ours nor after theirs */
1167 return 0;
1168 }
1169 return 1;
1170}
1171
88246898
JS
1172static void checkdiff_consume(void *priv, char *line, unsigned long len)
1173{
1174 struct checkdiff_t *data = priv;
1ba111d1
JH
1175 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1176 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1177 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1178 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
c1795bb0 1179 char *err;
88246898
JS
1180
1181 if (line[0] == '+') {
18374e58 1182 unsigned bad;
0ef617f4 1183 data->lineno++;
877f23cc
JH
1184 if (!ws_blank_line(line + 1, len - 1, data->ws_rule))
1185 data->trailing_blanks_start = 0;
1186 else if (!data->trailing_blanks_start)
1187 data->trailing_blanks_start = data->lineno;
04954043
JH
1188 if (is_conflict_marker(line + 1, len - 1)) {
1189 data->status |= 1;
1190 fprintf(data->o->file,
1191 "%s:%d: leftover conflict marker\n",
1192 data->filename, data->lineno);
1193 }
8f8841e9 1194 bad = ws_check(line + 1, len - 1, data->ws_rule);
18374e58 1195 if (!bad)
c1795bb0 1196 return;
18374e58
JH
1197 data->status |= bad;
1198 err = whitespace_error_string(bad);
1ba111d1
JH
1199 fprintf(data->o->file, "%s:%d: %s.\n",
1200 data->filename, data->lineno, err);
c1795bb0 1201 free(err);
1ba111d1 1202 emit_line(data->o->file, set, reset, line, 1);
8f8841e9 1203 ws_check_emit(line + 1, len - 1, data->ws_rule,
1ba111d1 1204 data->o->file, set, reset, ws);
877f23cc 1205 } else if (line[0] == ' ') {
88246898 1206 data->lineno++;
877f23cc
JH
1207 data->trailing_blanks_start = 0;
1208 } else if (line[0] == '@') {
88246898
JS
1209 char *plus = strchr(line, '+');
1210 if (plus)
0ef617f4 1211 data->lineno = strtol(plus, NULL, 10) - 1;
88246898
JS
1212 else
1213 die("invalid diff");
877f23cc 1214 data->trailing_blanks_start = 0;
88246898
JS
1215 }
1216}
1217
0660626c
JH
1218static unsigned char *deflate_it(char *data,
1219 unsigned long size,
1220 unsigned long *result_size)
051308f6 1221{
0660626c
JH
1222 int bound;
1223 unsigned char *deflated;
1224 z_stream stream;
1225
1226 memset(&stream, 0, sizeof(stream));
12f6c308 1227 deflateInit(&stream, zlib_compression_level);
0660626c
JH
1228 bound = deflateBound(&stream, size);
1229 deflated = xmalloc(bound);
1230 stream.next_out = deflated;
1231 stream.avail_out = bound;
1232
1233 stream.next_in = (unsigned char *)data;
1234 stream.avail_in = size;
1235 while (deflate(&stream, Z_FINISH) == Z_OK)
1236 ; /* nothing */
1237 deflateEnd(&stream);
1238 *result_size = stream.total_out;
1239 return deflated;
051308f6
JH
1240}
1241
c0c77734 1242static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
051308f6 1243{
0660626c
JH
1244 void *cp;
1245 void *delta;
1246 void *deflated;
1247 void *data;
1248 unsigned long orig_size;
1249 unsigned long delta_size;
1250 unsigned long deflate_size;
1251 unsigned long data_size;
051308f6 1252
0660626c
JH
1253 /* We could do deflated delta, or we could do just deflated two,
1254 * whichever is smaller.
051308f6 1255 */
0660626c
JH
1256 delta = NULL;
1257 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1258 if (one->size && two->size) {
1259 delta = diff_delta(one->ptr, one->size,
1260 two->ptr, two->size,
1261 &delta_size, deflate_size);
1262 if (delta) {
1263 void *to_free = delta;
1264 orig_size = delta_size;
1265 delta = deflate_it(delta, delta_size, &delta_size);
1266 free(to_free);
051308f6
JH
1267 }
1268 }
051308f6 1269
0660626c 1270 if (delta && delta_size < deflate_size) {
c0c77734 1271 fprintf(file, "delta %lu\n", orig_size);
0660626c
JH
1272 free(deflated);
1273 data = delta;
1274 data_size = delta_size;
1275 }
1276 else {
c0c77734 1277 fprintf(file, "literal %lu\n", two->size);
0660626c
JH
1278 free(delta);
1279 data = deflated;
1280 data_size = deflate_size;
1281 }
051308f6 1282
0660626c
JH
1283 /* emit data encoded in base85 */
1284 cp = data;
1285 while (data_size) {
1286 int bytes = (52 < data_size) ? 52 : data_size;
051308f6 1287 char line[70];
0660626c 1288 data_size -= bytes;
051308f6
JH
1289 if (bytes <= 26)
1290 line[0] = bytes + 'A' - 1;
1291 else
1292 line[0] = bytes - 26 + 'a' - 1;
1293 encode_85(line + 1, cp, bytes);
1d7f171c 1294 cp = (char *) cp + bytes;
c0c77734
DB
1295 fputs(line, file);
1296 fputc('\n', file);
051308f6 1297 }
c0c77734 1298 fprintf(file, "\n");
0660626c 1299 free(data);
051308f6
JH
1300}
1301
c0c77734 1302static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
d4c452f0 1303{
c0c77734
DB
1304 fprintf(file, "GIT binary patch\n");
1305 emit_binary_diff_body(file, one, two);
1306 emit_binary_diff_body(file, two, one);
d4c452f0
JH
1307}
1308
8c701249
JH
1309static void setup_diff_attr_check(struct git_attr_check *check)
1310{
1311 static struct git_attr *attr_diff;
1312
29a3eefd 1313 if (!attr_diff) {
8c701249 1314 attr_diff = git_attr("diff", 4);
29a3eefd
JH
1315 }
1316 check[0].attr = attr_diff;
8c701249
JH
1317}
1318
29a3eefd 1319static void diff_filespec_check_attr(struct diff_filespec *one)
6973dcae 1320{
e0e324a4 1321 struct git_attr_check attr_diff_check;
2c3fa66f 1322 int check_from_data = 0;
8c701249 1323
29a3eefd
JH
1324 if (one->checked_attr)
1325 return;
1326
e0e324a4 1327 setup_diff_attr_check(&attr_diff_check);
29a3eefd 1328 one->is_binary = 0;
e0e324a4 1329 one->funcname_pattern_ident = NULL;
29a3eefd 1330
e0e324a4 1331 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
29a3eefd
JH
1332 const char *value;
1333
1334 /* binaryness */
e0e324a4 1335 value = attr_diff_check.value;
515106fa 1336 if (ATTR_TRUE(value))
29a3eefd 1337 ;
515106fa 1338 else if (ATTR_FALSE(value))
29a3eefd 1339 one->is_binary = 1;
2c3fa66f
JH
1340 else
1341 check_from_data = 1;
f258475a 1342
e0e324a4 1343 /* funcname pattern ident */
f258475a
JH
1344 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1345 ;
1346 else
e0e324a4 1347 one->funcname_pattern_ident = value;
515106fa 1348 }
40250af4 1349
2c3fa66f
JH
1350 if (check_from_data) {
1351 if (!one->data && DIFF_FILE_VALID(one))
1352 diff_populate_filespec(one, 0);
29a3eefd 1353
2c3fa66f
JH
1354 if (one->data)
1355 one->is_binary = buffer_is_binary(one->data, one->size);
1356 }
29a3eefd
JH
1357}
1358
1359int diff_filespec_is_binary(struct diff_filespec *one)
1360{
1361 diff_filespec_check_attr(one);
1362 return one->is_binary;
6973dcae
JH
1363}
1364
e0e324a4 1365static const char *funcname_pattern(const char *ident)
f258475a 1366{
e0e324a4 1367 struct funcname_pattern *pp;
f258475a 1368
e0e324a4
JH
1369 for (pp = funcname_pattern_list; pp; pp = pp->next)
1370 if (!strcmp(ident, pp->name))
1371 return pp->pattern;
f258475a
JH
1372 return NULL;
1373}
1374
d3a93dc9
JH
1375static struct builtin_funcname_pattern {
1376 const char *name;
1377 const char *pattern;
1378} builtin_funcname_pattern[] = {
1379 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1380 "new\\|return\\|switch\\|throw\\|while\\)\n"
1381 "^[ ]*\\(\\([ ]*"
1382 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
14a5c7c1 1383 "[ ]*([^;]*\\)$" },
b50005b7
AP
1384 { "pascal", "^\\(\\(procedure\\|function\\|constructor\\|"
1385 "destructor\\|interface\\|implementation\\|"
1386 "initialization\\|finalization\\)[ \t]*.*\\)$"
1387 "\\|"
1388 "^\\(.*=[ \t]*\\(class\\|record\\).*\\)$"
1389 },
23b5beb2 1390 { "bibtex", "\\(@[a-zA-Z]\\{1,\\}[ \t]*{\\{0,1\\}[ \t]*[^ \t\"@',\\#}{~%]*\\).*$" },
807d8694 1391 { "tex", "^\\(\\\\\\(\\(sub\\)*section\\|chapter\\|part\\)\\*\\{0,1\\}{.*\\)$" },
ad8c1d92 1392 { "ruby", "^\\s*\\(\\(class\\|module\\|def\\)\\s.*\\)$" },
d3a93dc9
JH
1393};
1394
e0e324a4 1395static const char *diff_funcname_pattern(struct diff_filespec *one)
f258475a 1396{
e0e324a4 1397 const char *ident, *pattern;
d3a93dc9 1398 int i;
f258475a
JH
1399
1400 diff_filespec_check_attr(one);
e0e324a4 1401 ident = one->funcname_pattern_ident;
f258475a
JH
1402
1403 if (!ident)
1404 /*
1405 * If the config file has "funcname.default" defined, that
1406 * regexp is used; otherwise NULL is returned and xemit uses
1407 * the built-in default.
1408 */
e0e324a4 1409 return funcname_pattern("default");
f258475a
JH
1410
1411 /* Look up custom "funcname.$ident" regexp from config. */
e0e324a4
JH
1412 pattern = funcname_pattern(ident);
1413 if (pattern)
1414 return pattern;
f258475a
JH
1415
1416 /*
1417 * And define built-in fallback patterns here. Note that
9f6fe822 1418 * these can be overridden by the user's config settings.
f258475a 1419 */
d3a93dc9
JH
1420 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1421 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1422 return builtin_funcname_pattern[i].pattern;
f258475a
JH
1423
1424 return NULL;
1425}
1426
6973dcae
JH
1427static void builtin_diff(const char *name_a,
1428 const char *name_b,
1429 struct diff_filespec *one,
1430 struct diff_filespec *two,
1431 const char *xfrm_msg,
051308f6 1432 struct diff_options *o,
6973dcae
JH
1433 int complete_rewrite)
1434{
1435 mmfile_t mf1, mf2;
1436 const char *lbl[2];
1437 char *a_one, *b_two;
8f67f8ae
PH
1438 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1439 const char *reset = diff_get_color_opt(o, DIFF_RESET);
6973dcae 1440
eab9a40b
JS
1441 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1442 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
6973dcae
JH
1443 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1444 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
c0c77734 1445 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
6973dcae
JH
1446 if (lbl[0][0] == '/') {
1447 /* /dev/null */
c0c77734 1448 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
50f575fc 1449 if (xfrm_msg && xfrm_msg[0])
c0c77734 1450 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1451 }
1452 else if (lbl[1][0] == '/') {
c0c77734 1453 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
50f575fc 1454 if (xfrm_msg && xfrm_msg[0])
c0c77734 1455 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1456 }
1457 else {
1458 if (one->mode != two->mode) {
c0c77734
DB
1459 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1460 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
cd112cef 1461 }
50f575fc 1462 if (xfrm_msg && xfrm_msg[0])
c0c77734 1463 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1464 /*
1465 * we do not run diff between different kind
1466 * of objects.
1467 */
1468 if ((one->mode ^ two->mode) & S_IFMT)
1469 goto free_ab_and_return;
1470 if (complete_rewrite) {
eab9a40b 1471 emit_rewrite_diff(name_a, name_b, one, two, o);
34a5e1a2 1472 o->found_changes = 1;
6973dcae
JH
1473 goto free_ab_and_return;
1474 }
1475 }
1476
1477 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1478 die("unable to read files to diff");
1479
8f67f8ae 1480 if (!DIFF_OPT_TST(o, TEXT) &&
29a3eefd 1481 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
0660626c
JH
1482 /* Quite common confusing case */
1483 if (mf1.size == mf2.size &&
1484 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1485 goto free_ab_and_return;
8f67f8ae 1486 if (DIFF_OPT_TST(o, BINARY))
c0c77734 1487 emit_binary_diff(o->file, &mf1, &mf2);
051308f6 1488 else
c0c77734
DB
1489 fprintf(o->file, "Binary files %s and %s differ\n",
1490 lbl[0], lbl[1]);
34a5e1a2 1491 o->found_changes = 1;
051308f6 1492 }
6973dcae
JH
1493 else {
1494 /* Crazy xdl interfaces.. */
1495 const char *diffopts = getenv("GIT_DIFF_OPTS");
1496 xpparam_t xpp;
1497 xdemitconf_t xecfg;
1498 xdemitcb_t ecb;
1499 struct emit_callback ecbdata;
e0e324a4 1500 const char *funcname_pattern;
f258475a 1501
e0e324a4
JH
1502 funcname_pattern = diff_funcname_pattern(one);
1503 if (!funcname_pattern)
1504 funcname_pattern = diff_funcname_pattern(two);
6973dcae 1505
30b25010 1506 memset(&xecfg, 0, sizeof(xecfg));
cd112cef 1507 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 1508 ecbdata.label_path = lbl;
8f67f8ae 1509 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
34a5e1a2 1510 ecbdata.found_changesp = &o->found_changes;
cf1b7869 1511 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
c0c77734 1512 ecbdata.file = o->file;
0d21efa5 1513 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
ee1e5412 1514 xecfg.ctxlen = o->context;
6973dcae 1515 xecfg.flags = XDL_EMIT_FUNCNAMES;
e0e324a4
JH
1516 if (funcname_pattern)
1517 xdiff_set_find_func(&xecfg, funcname_pattern);
6973dcae
JH
1518 if (!diffopts)
1519 ;
cc44c765 1520 else if (!prefixcmp(diffopts, "--unified="))
6973dcae 1521 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
cc44c765 1522 else if (!prefixcmp(diffopts, "-u"))
6973dcae 1523 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
cd112cef 1524 ecb.outf = xdiff_outf;
6973dcae 1525 ecb.priv = &ecbdata;
cd112cef 1526 ecbdata.xm.consume = fn_out_consume;
c0c77734 1527 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
f59a59e2
JS
1528 ecbdata.diff_words =
1529 xcalloc(1, sizeof(struct diff_words_data));
c0c77734
DB
1530 ecbdata.diff_words->file = o->file;
1531 }
c279d7e9 1532 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
8f67f8ae 1533 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
f59a59e2 1534 free_diff_words_data(&ecbdata);
6973dcae
JH
1535 }
1536
1537 free_ab_and_return:
fc3abdf5
JH
1538 diff_free_filespec_data(one);
1539 diff_free_filespec_data(two);
6973dcae
JH
1540 free(a_one);
1541 free(b_two);
1542 return;
1543}
1544
1545static void builtin_diffstat(const char *name_a, const char *name_b,
1546 struct diff_filespec *one,
1547 struct diff_filespec *two,
710158e3 1548 struct diffstat_t *diffstat,
0d21efa5 1549 struct diff_options *o,
710158e3 1550 int complete_rewrite)
6973dcae
JH
1551{
1552 mmfile_t mf1, mf2;
1553 struct diffstat_file *data;
1554
1555 data = diffstat_add(diffstat, name_a, name_b);
1556
1557 if (!one || !two) {
1558 data->is_unmerged = 1;
1559 return;
1560 }
710158e3
JH
1561 if (complete_rewrite) {
1562 diff_populate_filespec(one, 0);
1563 diff_populate_filespec(two, 0);
1564 data->deleted = count_lines(one->data, one->size);
1565 data->added = count_lines(two->data, two->size);
fc3abdf5 1566 goto free_and_return;
710158e3 1567 }
6973dcae
JH
1568 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1569 die("unable to read files to diff");
1570
29a3eefd 1571 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
6973dcae 1572 data->is_binary = 1;
b1882587
AP
1573 data->added = mf2.size;
1574 data->deleted = mf1.size;
1575 } else {
6973dcae
JH
1576 /* Crazy xdl interfaces.. */
1577 xpparam_t xpp;
1578 xdemitconf_t xecfg;
1579 xdemitcb_t ecb;
1580
30b25010 1581 memset(&xecfg, 0, sizeof(xecfg));
0d21efa5 1582 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
6973dcae
JH
1583 ecb.outf = xdiff_outf;
1584 ecb.priv = diffstat;
c279d7e9 1585 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
6973dcae 1586 }
fc3abdf5
JH
1587
1588 free_and_return:
1589 diff_free_filespec_data(one);
1590 diff_free_filespec_data(two);
6973dcae
JH
1591}
1592
88246898 1593static void builtin_checkdiff(const char *name_a, const char *name_b,
cd676a51 1594 const char *attr_path,
5ff10dd6
JH
1595 struct diff_filespec *one,
1596 struct diff_filespec *two,
1597 struct diff_options *o)
88246898
JS
1598{
1599 mmfile_t mf1, mf2;
1600 struct checkdiff_t data;
1601
1602 if (!two)
1603 return;
1604
1605 memset(&data, 0, sizeof(data));
1606 data.xm.consume = checkdiff_consume;
1607 data.filename = name_b ? name_b : name_a;
1608 data.lineno = 0;
1ba111d1 1609 data.o = o;
cd676a51 1610 data.ws_rule = whitespace_rule(attr_path);
88246898
JS
1611
1612 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1613 die("unable to read files to diff");
1614
5ff10dd6
JH
1615 /*
1616 * All the other codepaths check both sides, but not checking
1617 * the "old" side here is deliberate. We are checking the newly
1618 * introduced changes, and as long as the "new" side is text, we
1619 * can and should check what it introduces.
1620 */
29a3eefd 1621 if (diff_filespec_is_binary(two))
fc3abdf5 1622 goto free_and_return;
88246898
JS
1623 else {
1624 /* Crazy xdl interfaces.. */
1625 xpparam_t xpp;
1626 xdemitconf_t xecfg;
1627 xdemitcb_t ecb;
1628
30b25010 1629 memset(&xecfg, 0, sizeof(xecfg));
88246898 1630 xpp.flags = XDF_NEED_MINIMAL;
88246898
JS
1631 ecb.outf = xdiff_outf;
1632 ecb.priv = &data;
c279d7e9 1633 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
877f23cc 1634
04c6e9e9
JH
1635 if ((data.ws_rule & WS_TRAILING_SPACE) &&
1636 data.trailing_blanks_start) {
877f23cc
JH
1637 fprintf(o->file, "%s:%d: ends with blank lines.\n",
1638 data.filename, data.trailing_blanks_start);
1639 data.status = 1; /* report errors */
1640 }
88246898 1641 }
fc3abdf5
JH
1642 free_and_return:
1643 diff_free_filespec_data(one);
1644 diff_free_filespec_data(two);
62c64895
WC
1645 if (data.status)
1646 DIFF_OPT_SET(o, CHECK_FAILED);
88246898
JS
1647}
1648
6973dcae
JH
1649struct diff_filespec *alloc_filespec(const char *path)
1650{
1651 int namelen = strlen(path);
1652 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1653
1654 memset(spec, 0, sizeof(*spec));
1655 spec->path = (char *)(spec + 1);
1656 memcpy(spec->path, path, namelen+1);
9fb88419 1657 spec->count = 1;
6973dcae
JH
1658 return spec;
1659}
1660
9fb88419
LT
1661void free_filespec(struct diff_filespec *spec)
1662{
1663 if (!--spec->count) {
1664 diff_free_filespec_data(spec);
1665 free(spec);
1666 }
1667}
1668
6973dcae
JH
1669void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1670 unsigned short mode)
1671{
1672 if (mode) {
1673 spec->mode = canon_mode(mode);
e702496e 1674 hashcpy(spec->sha1, sha1);
0bef57ee 1675 spec->sha1_valid = !is_null_sha1(sha1);
6973dcae
JH
1676 }
1677}
1678
1679/*
5adf317b 1680 * Given a name and sha1 pair, if the index tells us the file in
6973dcae
JH
1681 * the work tree has that object contents, return true, so that
1682 * prepare_temp_file() does not have to inflate and extract.
1683 */
1510fea7 1684static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
6973dcae
JH
1685{
1686 struct cache_entry *ce;
1687 struct stat st;
1688 int pos, len;
1689
150115ad
JH
1690 /*
1691 * We do not read the cache ourselves here, because the
6973dcae
JH
1692 * benchmark with my previous version that always reads cache
1693 * shows that it makes things worse for diff-tree comparing
1694 * two linux-2.6 kernel trees in an already checked out work
1695 * tree. This is because most diff-tree comparisons deal with
1696 * only a small number of files, while reading the cache is
1697 * expensive for a large project, and its cost outweighs the
1698 * savings we get by not inflating the object to a temporary
1699 * file. Practically, this code only helps when we are used
1700 * by diff-cache --cached, which does read the cache before
1701 * calling us.
1702 */
1703 if (!active_cache)
1704 return 0;
1705
1510fea7
SP
1706 /* We want to avoid the working directory if our caller
1707 * doesn't need the data in a normal file, this system
1708 * is rather slow with its stat/open/mmap/close syscalls,
1709 * and the object is contained in a pack file. The pack
1710 * is probably already open and will be faster to obtain
1711 * the data through than the working directory. Loose
1712 * objects however would tend to be slower as they need
1713 * to be individually opened and inflated.
1714 */
5caf9232 1715 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1510fea7
SP
1716 return 0;
1717
6973dcae
JH
1718 len = strlen(name);
1719 pos = cache_name_pos(name, len);
1720 if (pos < 0)
1721 return 0;
1722 ce = active_cache[pos];
eadb5831
JH
1723
1724 /*
1725 * This is not the sha1 we are looking for, or
1726 * unreusable because it is not a regular file.
1727 */
1728 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
6973dcae 1729 return 0;
eadb5831 1730
150115ad
JH
1731 /*
1732 * If ce is marked as "assume unchanged", there is no
1733 * guarantee that work tree matches what we are looking for.
1734 */
1735 if (ce->ce_flags & CE_VALID)
1736 return 0;
1737
eadb5831
JH
1738 /*
1739 * If ce matches the file in the work tree, we can reuse it.
6973dcae 1740 */
eadb5831
JH
1741 if (ce_uptodate(ce) ||
1742 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1743 return 1;
1744
1745 return 0;
6973dcae
JH
1746}
1747
3afaa72d
JH
1748static int populate_from_stdin(struct diff_filespec *s)
1749{
af6eb822 1750 struct strbuf buf;
c32f749f 1751 size_t size = 0;
af6eb822 1752
f1696ee3
PH
1753 strbuf_init(&buf, 0);
1754 if (strbuf_read(&buf, 0, 0) < 0)
af6eb822 1755 return error("error while reading from stdin %s",
3afaa72d 1756 strerror(errno));
af6eb822 1757
3afaa72d 1758 s->should_munmap = 0;
c32f749f
RS
1759 s->data = strbuf_detach(&buf, &size);
1760 s->size = size;
3afaa72d
JH
1761 s->should_free = 1;
1762 return 0;
1763}
1764
04786756
LT
1765static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1766{
1767 int len;
1768 char *data = xmalloc(100);
1769 len = snprintf(data, 100,
1770 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1771 s->data = data;
1772 s->size = len;
1773 s->should_free = 1;
1774 if (size_only) {
1775 s->data = NULL;
1776 free(data);
1777 }
1778 return 0;
1779}
1780
6973dcae
JH
1781/*
1782 * While doing rename detection and pickaxe operation, we may need to
1783 * grab the data for the blob (or file) for our own in-core comparison.
1784 * diff_filespec has data and size fields for this purpose.
1785 */
1786int diff_populate_filespec(struct diff_filespec *s, int size_only)
1787{
1788 int err = 0;
1789 if (!DIFF_FILE_VALID(s))
1790 die("internal error: asking to populate invalid file.");
1791 if (S_ISDIR(s->mode))
1792 return -1;
1793
6973dcae 1794 if (s->data)
fc3abdf5 1795 return 0;
04786756 1796
6e0b8ed6
JH
1797 if (size_only && 0 < s->size)
1798 return 0;
1799
302b9282 1800 if (S_ISGITLINK(s->mode))
04786756
LT
1801 return diff_populate_gitlink(s, size_only);
1802
6973dcae 1803 if (!s->sha1_valid ||
1510fea7 1804 reuse_worktree_file(s->path, s->sha1, 0)) {
5ecd293d 1805 struct strbuf buf;
6973dcae
JH
1806 struct stat st;
1807 int fd;
6c510bee 1808
3afaa72d
JH
1809 if (!strcmp(s->path, "-"))
1810 return populate_from_stdin(s);
1811
6973dcae
JH
1812 if (lstat(s->path, &st) < 0) {
1813 if (errno == ENOENT) {
1814 err_empty:
1815 err = -1;
1816 empty:
d2543b8e 1817 s->data = (char *)"";
6973dcae
JH
1818 s->size = 0;
1819 return err;
1820 }
1821 }
dc49cd76 1822 s->size = xsize_t(st.st_size);
6973dcae
JH
1823 if (!s->size)
1824 goto empty;
1825 if (size_only)
1826 return 0;
1827 if (S_ISLNK(st.st_mode)) {
1828 int ret;
1829 s->data = xmalloc(s->size);
1830 s->should_free = 1;
1831 ret = readlink(s->path, s->data, s->size);
1832 if (ret < 0) {
1833 free(s->data);
1834 goto err_empty;
1835 }
1836 return 0;
1837 }
1838 fd = open(s->path, O_RDONLY);
1839 if (fd < 0)
1840 goto err_empty;
c4712e45 1841 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 1842 close(fd);
6973dcae 1843 s->should_munmap = 1;
6c510bee
LT
1844
1845 /*
1846 * Convert from working tree format to canonical git format
1847 */
5ecd293d 1848 strbuf_init(&buf, 0);
21e5ad50 1849 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
c32f749f 1850 size_t size = 0;
6c510bee
LT
1851 munmap(s->data, s->size);
1852 s->should_munmap = 0;
c32f749f
RS
1853 s->data = strbuf_detach(&buf, &size);
1854 s->size = size;
6c510bee
LT
1855 s->should_free = 1;
1856 }
6973dcae
JH
1857 }
1858 else {
21666f1a 1859 enum object_type type;
6e0b8ed6 1860 if (size_only)
21666f1a 1861 type = sha1_object_info(s->sha1, &s->size);
6973dcae 1862 else {
21666f1a 1863 s->data = read_sha1_file(s->sha1, &type, &s->size);
6973dcae
JH
1864 s->should_free = 1;
1865 }
1866 }
1867 return 0;
1868}
1869
8ae92e63 1870void diff_free_filespec_blob(struct diff_filespec *s)
6973dcae
JH
1871{
1872 if (s->should_free)
1873 free(s->data);
1874 else if (s->should_munmap)
1875 munmap(s->data, s->size);
fc3abdf5
JH
1876
1877 if (s->should_free || s->should_munmap) {
1878 s->should_free = s->should_munmap = 0;
1879 s->data = NULL;
1880 }
eede7b7d
JK
1881}
1882
1883void diff_free_filespec_data(struct diff_filespec *s)
1884{
8ae92e63 1885 diff_free_filespec_blob(s);
6973dcae
JH
1886 free(s->cnt_data);
1887 s->cnt_data = NULL;
1888}
1889
1890static void prep_temp_blob(struct diff_tempfile *temp,
1891 void *blob,
1892 unsigned long size,
1893 const unsigned char *sha1,
1894 int mode)
1895{
1896 int fd;
1897
1472966c 1898 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
6973dcae 1899 if (fd < 0)
e7a7be88 1900 die("unable to create temp-file: %s", strerror(errno));
93822c22 1901 if (write_in_full(fd, blob, size) != size)
6973dcae
JH
1902 die("unable to write temp-file");
1903 close(fd);
1904 temp->name = temp->tmp_path;
1905 strcpy(temp->hex, sha1_to_hex(sha1));
1906 temp->hex[40] = 0;
1907 sprintf(temp->mode, "%06o", mode);
1908}
1909
1910static void prepare_temp_file(const char *name,
1911 struct diff_tempfile *temp,
1912 struct diff_filespec *one)
1913{
1914 if (!DIFF_FILE_VALID(one)) {
1915 not_a_valid_file:
1916 /* A '-' entry produces this for file-2, and
1917 * a '+' entry produces this for file-1.
1918 */
1919 temp->name = "/dev/null";
1920 strcpy(temp->hex, ".");
1921 strcpy(temp->mode, ".");
1922 return;
1923 }
1924
1925 if (!one->sha1_valid ||
1510fea7 1926 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
1927 struct stat st;
1928 if (lstat(name, &st) < 0) {
1929 if (errno == ENOENT)
1930 goto not_a_valid_file;
1931 die("stat(%s): %s", name, strerror(errno));
1932 }
1933 if (S_ISLNK(st.st_mode)) {
1934 int ret;
1935 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
dc49cd76 1936 size_t sz = xsize_t(st.st_size);
6973dcae
JH
1937 if (sizeof(buf) <= st.st_size)
1938 die("symlink too long: %s", name);
dc49cd76 1939 ret = readlink(name, buf, sz);
6973dcae
JH
1940 if (ret < 0)
1941 die("readlink(%s)", name);
dc49cd76 1942 prep_temp_blob(temp, buf, sz,
6973dcae
JH
1943 (one->sha1_valid ?
1944 one->sha1 : null_sha1),
1945 (one->sha1_valid ?
1946 one->mode : S_IFLNK));
1947 }
1948 else {
1949 /* we can borrow from the file in the work tree */
1950 temp->name = name;
1951 if (!one->sha1_valid)
1952 strcpy(temp->hex, sha1_to_hex(null_sha1));
1953 else
1954 strcpy(temp->hex, sha1_to_hex(one->sha1));
1955 /* Even though we may sometimes borrow the
1956 * contents from the work tree, we always want
1957 * one->mode. mode is trustworthy even when
1958 * !(one->sha1_valid), as long as
1959 * DIFF_FILE_VALID(one).
1960 */
1961 sprintf(temp->mode, "%06o", one->mode);
1962 }
1963 return;
1964 }
1965 else {
1966 if (diff_populate_filespec(one, 0))
1967 die("cannot read data blob for %s", one->path);
1968 prep_temp_blob(temp, one->data, one->size,
1969 one->sha1, one->mode);
1970 }
1971}
1972
1973static void remove_tempfile(void)
1974{
1975 int i;
1976
1977 for (i = 0; i < 2; i++)
1978 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1979 unlink(diff_temp[i].name);
1980 diff_temp[i].name = NULL;
1981 }
1982}
1983
1984static void remove_tempfile_on_signal(int signo)
1985{
1986 remove_tempfile();
1987 signal(SIGINT, SIG_DFL);
1988 raise(signo);
1989}
1990
6973dcae
JH
1991/* An external diff command takes:
1992 *
1993 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1994 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1995 *
1996 */
1997static void run_external_diff(const char *pgm,
1998 const char *name,
1999 const char *other,
2000 struct diff_filespec *one,
2001 struct diff_filespec *two,
2002 const char *xfrm_msg,
2003 int complete_rewrite)
2004{
2005 const char *spawn_arg[10];
2006 struct diff_tempfile *temp = diff_temp;
2007 int retval;
2008 static int atexit_asked = 0;
2009 const char *othername;
2010 const char **arg = &spawn_arg[0];
2011
2012 othername = (other? other : name);
2013 if (one && two) {
2014 prepare_temp_file(name, &temp[0], one);
2015 prepare_temp_file(othername, &temp[1], two);
2016 if (! atexit_asked &&
2017 (temp[0].name == temp[0].tmp_path ||
2018 temp[1].name == temp[1].tmp_path)) {
2019 atexit_asked = 1;
2020 atexit(remove_tempfile);
2021 }
2022 signal(SIGINT, remove_tempfile_on_signal);
2023 }
2024
2025 if (one && two) {
2026 *arg++ = pgm;
2027 *arg++ = name;
2028 *arg++ = temp[0].name;
2029 *arg++ = temp[0].hex;
2030 *arg++ = temp[0].mode;
2031 *arg++ = temp[1].name;
2032 *arg++ = temp[1].hex;
2033 *arg++ = temp[1].mode;
2034 if (other) {
2035 *arg++ = other;
2036 *arg++ = xfrm_msg;
2037 }
2038 } else {
2039 *arg++ = pgm;
2040 *arg++ = name;
2041 }
2042 *arg = NULL;
d5535ec7
JS
2043 fflush(NULL);
2044 retval = run_command_v_opt(spawn_arg, 0);
6973dcae
JH
2045 remove_tempfile();
2046 if (retval) {
2047 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2048 exit(1);
2049 }
2050}
2051
f1af60bd
JH
2052static const char *external_diff_attr(const char *name)
2053{
2054 struct git_attr_check attr_diff_check;
2055
cd676a51
JH
2056 if (!name)
2057 return NULL;
2058
f1af60bd
JH
2059 setup_diff_attr_check(&attr_diff_check);
2060 if (!git_checkattr(name, 1, &attr_diff_check)) {
2061 const char *value = attr_diff_check.value;
2062 if (!ATTR_TRUE(value) &&
2063 !ATTR_FALSE(value) &&
2064 !ATTR_UNSET(value)) {
2065 struct ll_diff_driver *drv;
2066
f1af60bd
JH
2067 for (drv = user_diff; drv; drv = drv->next)
2068 if (!strcmp(drv->name, value))
2069 return drv->cmd;
2070 }
2071 }
2072 return NULL;
2073}
2074
6973dcae
JH
2075static void run_diff_cmd(const char *pgm,
2076 const char *name,
2077 const char *other,
cd676a51 2078 const char *attr_path,
6973dcae
JH
2079 struct diff_filespec *one,
2080 struct diff_filespec *two,
2081 const char *xfrm_msg,
051308f6 2082 struct diff_options *o,
6973dcae
JH
2083 int complete_rewrite)
2084{
8f67f8ae 2085 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
f1af60bd
JH
2086 pgm = NULL;
2087 else {
cd676a51 2088 const char *cmd = external_diff_attr(attr_path);
f1af60bd
JH
2089 if (cmd)
2090 pgm = cmd;
2091 }
2092
6973dcae
JH
2093 if (pgm) {
2094 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2095 complete_rewrite);
2096 return;
2097 }
2098 if (one && two)
2099 builtin_diff(name, other ? other : name,
051308f6 2100 one, two, xfrm_msg, o, complete_rewrite);
6973dcae 2101 else
c0c77734 2102 fprintf(o->file, "* Unmerged path %s\n", name);
6973dcae
JH
2103}
2104
2105static void diff_fill_sha1_info(struct diff_filespec *one)
2106{
2107 if (DIFF_FILE_VALID(one)) {
2108 if (!one->sha1_valid) {
2109 struct stat st;
5332b2af
JS
2110 if (!strcmp(one->path, "-")) {
2111 hashcpy(one->sha1, null_sha1);
2112 return;
2113 }
6973dcae
JH
2114 if (lstat(one->path, &st) < 0)
2115 die("stat %s", one->path);
2116 if (index_path(one->sha1, one->path, &st, 0))
2117 die("cannot hash %s\n", one->path);
2118 }
2119 }
2120 else
e702496e 2121 hashclr(one->sha1);
6973dcae
JH
2122}
2123
125b7630
RS
2124static int similarity_index(struct diff_filepair *p)
2125{
2126 return p->score * 100 / MAX_SCORE;
2127}
2128
cd676a51
JH
2129static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2130{
2131 /* Strip the prefix but do not molest /dev/null and absolute paths */
2132 if (*namep && **namep != '/')
2133 *namep += prefix_length;
2134 if (*otherp && **otherp != '/')
2135 *otherp += prefix_length;
2136}
2137
6973dcae
JH
2138static void run_diff(struct diff_filepair *p, struct diff_options *o)
2139{
2140 const char *pgm = external_diff();
663af342
PH
2141 struct strbuf msg;
2142 char *xfrm_msg;
2143 struct diff_filespec *one = p->one;
2144 struct diff_filespec *two = p->two;
6973dcae
JH
2145 const char *name;
2146 const char *other;
cd676a51 2147 const char *attr_path;
6973dcae 2148 int complete_rewrite = 0;
663af342 2149
cd676a51
JH
2150 name = p->one->path;
2151 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2152 attr_path = name;
2153 if (o->prefix_length)
2154 strip_prefix(o->prefix_length, &name, &other);
6973dcae
JH
2155
2156 if (DIFF_PAIR_UNMERGED(p)) {
cd676a51
JH
2157 run_diff_cmd(pgm, name, NULL, attr_path,
2158 NULL, NULL, NULL, o, 0);
6973dcae
JH
2159 return;
2160 }
2161
6973dcae
JH
2162 diff_fill_sha1_info(one);
2163 diff_fill_sha1_info(two);
2164
663af342 2165 strbuf_init(&msg, PATH_MAX * 2 + 300);
6973dcae
JH
2166 switch (p->status) {
2167 case DIFF_STATUS_COPIED:
663af342
PH
2168 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2169 strbuf_addstr(&msg, "\ncopy from ");
2170 quote_c_style(name, &msg, NULL, 0);
2171 strbuf_addstr(&msg, "\ncopy to ");
2172 quote_c_style(other, &msg, NULL, 0);
2173 strbuf_addch(&msg, '\n');
6973dcae
JH
2174 break;
2175 case DIFF_STATUS_RENAMED:
663af342
PH
2176 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2177 strbuf_addstr(&msg, "\nrename from ");
2178 quote_c_style(name, &msg, NULL, 0);
2179 strbuf_addstr(&msg, "\nrename to ");
2180 quote_c_style(other, &msg, NULL, 0);
2181 strbuf_addch(&msg, '\n');
6973dcae
JH
2182 break;
2183 case DIFF_STATUS_MODIFIED:
2184 if (p->score) {
663af342 2185 strbuf_addf(&msg, "dissimilarity index %d%%\n",
125b7630 2186 similarity_index(p));
6973dcae
JH
2187 complete_rewrite = 1;
2188 break;
2189 }
2190 /* fallthru */
2191 default:
2192 /* nothing */
2193 ;
2194 }
2195
a89fccd2 2196 if (hashcmp(one->sha1, two->sha1)) {
8f67f8ae 2197 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
6973dcae 2198
8f67f8ae 2199 if (DIFF_OPT_TST(o, BINARY)) {
82793c55 2200 mmfile_t mf;
29a3eefd
JH
2201 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2202 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
82793c55
JH
2203 abbrev = 40;
2204 }
663af342 2205 strbuf_addf(&msg, "index %.*s..%.*s",
dcb3450f
LT
2206 abbrev, sha1_to_hex(one->sha1),
2207 abbrev, sha1_to_hex(two->sha1));
6973dcae 2208 if (one->mode == two->mode)
663af342
PH
2209 strbuf_addf(&msg, " %06o", one->mode);
2210 strbuf_addch(&msg, '\n');
6973dcae
JH
2211 }
2212
663af342
PH
2213 if (msg.len)
2214 strbuf_setlen(&msg, msg.len - 1);
2215 xfrm_msg = msg.len ? msg.buf : NULL;
6973dcae
JH
2216
2217 if (!pgm &&
2218 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2219 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2220 /* a filepair that changes between file and symlink
2221 * needs to be split into deletion and creation.
2222 */
2223 struct diff_filespec *null = alloc_filespec(two->path);
cd676a51
JH
2224 run_diff_cmd(NULL, name, other, attr_path,
2225 one, null, xfrm_msg, o, 0);
6973dcae
JH
2226 free(null);
2227 null = alloc_filespec(one->path);
cd676a51
JH
2228 run_diff_cmd(NULL, name, other, attr_path,
2229 null, two, xfrm_msg, o, 0);
6973dcae
JH
2230 free(null);
2231 }
2232 else
cd676a51
JH
2233 run_diff_cmd(pgm, name, other, attr_path,
2234 one, two, xfrm_msg, o, complete_rewrite);
6973dcae 2235
663af342 2236 strbuf_release(&msg);
6973dcae
JH
2237}
2238
2239static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2240 struct diffstat_t *diffstat)
2241{
2242 const char *name;
2243 const char *other;
710158e3 2244 int complete_rewrite = 0;
6973dcae
JH
2245
2246 if (DIFF_PAIR_UNMERGED(p)) {
2247 /* unmerged */
0d21efa5 2248 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
2249 return;
2250 }
2251
2252 name = p->one->path;
2253 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2254
cd676a51
JH
2255 if (o->prefix_length)
2256 strip_prefix(o->prefix_length, &name, &other);
2257
6973dcae
JH
2258 diff_fill_sha1_info(p->one);
2259 diff_fill_sha1_info(p->two);
2260
710158e3
JH
2261 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2262 complete_rewrite = 1;
0d21efa5 2263 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
2264}
2265
88246898
JS
2266static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2267{
2268 const char *name;
2269 const char *other;
cd676a51 2270 const char *attr_path;
88246898
JS
2271
2272 if (DIFF_PAIR_UNMERGED(p)) {
2273 /* unmerged */
2274 return;
2275 }
2276
2277 name = p->one->path;
2278 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
cd676a51
JH
2279 attr_path = other ? other : name;
2280
2281 if (o->prefix_length)
2282 strip_prefix(o->prefix_length, &name, &other);
88246898
JS
2283
2284 diff_fill_sha1_info(p->one);
2285 diff_fill_sha1_info(p->two);
2286
cd676a51 2287 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
88246898
JS
2288}
2289
6973dcae
JH
2290void diff_setup(struct diff_options *options)
2291{
2292 memset(options, 0, sizeof(*options));
c0c77734
DB
2293
2294 options->file = stdout;
2295
6973dcae
JH
2296 options->line_termination = '\n';
2297 options->break_opt = -1;
2298 options->rename_limit = -1;
7df7c019 2299 options->dirstat_percent = 3;
ee1e5412 2300 options->context = 3;
6973dcae
JH
2301
2302 options->change = diff_change;
2303 options->add_remove = diff_addremove;
6b2f2d98 2304 if (diff_use_color_default > 0)
8f67f8ae
PH
2305 DIFF_OPT_SET(options, COLOR_DIFF);
2306 else
2307 DIFF_OPT_CLR(options, COLOR_DIFF);
b68ea12e 2308 options->detect_rename = diff_detect_rename_default;
eab9a40b
JS
2309
2310 options->a_prefix = "a/";
2311 options->b_prefix = "b/";
6973dcae
JH
2312}
2313
2314int diff_setup_done(struct diff_options *options)
2315{
d7de00f7
TH
2316 int count = 0;
2317
2318 if (options->output_format & DIFF_FORMAT_NAME)
2319 count++;
2320 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2321 count++;
2322 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2323 count++;
2324 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2325 count++;
2326 if (count > 1)
2327 die("--name-only, --name-status, --check and -s are mutually exclusive");
2328
8f67f8ae 2329 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
03b9d560
JH
2330 options->detect_rename = DIFF_DETECT_COPY;
2331
cd676a51
JH
2332 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2333 options->prefix = NULL;
2334 if (options->prefix)
2335 options->prefix_length = strlen(options->prefix);
2336 else
2337 options->prefix_length = 0;
2338
c6744349
TH
2339 if (options->output_format & (DIFF_FORMAT_NAME |
2340 DIFF_FORMAT_NAME_STATUS |
2341 DIFF_FORMAT_CHECKDIFF |
2342 DIFF_FORMAT_NO_OUTPUT))
2343 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 2344 DIFF_FORMAT_NUMSTAT |
c6744349 2345 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2346 DIFF_FORMAT_SHORTSTAT |
7df7c019 2347 DIFF_FORMAT_DIRSTAT |
c6744349
TH
2348 DIFF_FORMAT_SUMMARY |
2349 DIFF_FORMAT_PATCH);
2350
6973dcae
JH
2351 /*
2352 * These cases always need recursive; we do not drop caller-supplied
2353 * recursive bits for other formats here.
2354 */
c6744349 2355 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 2356 DIFF_FORMAT_NUMSTAT |
c6744349 2357 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2358 DIFF_FORMAT_SHORTSTAT |
7df7c019 2359 DIFF_FORMAT_DIRSTAT |
d7014dc0 2360 DIFF_FORMAT_SUMMARY |
c6744349 2361 DIFF_FORMAT_CHECKDIFF))
8f67f8ae 2362 DIFF_OPT_SET(options, RECURSIVE);
5e363541 2363 /*
3969cf7d 2364 * Also pickaxe would not work very well if you do not say recursive
5e363541 2365 */
3969cf7d 2366 if (options->pickaxe)
8f67f8ae 2367 DIFF_OPT_SET(options, RECURSIVE);
5e363541 2368
6973dcae
JH
2369 if (options->detect_rename && options->rename_limit < 0)
2370 options->rename_limit = diff_rename_limit_default;
2371 if (options->setup & DIFF_SETUP_USE_CACHE) {
2372 if (!active_cache)
2373 /* read-cache does not die even when it fails
2374 * so it is safe for us to do this here. Also
2375 * it does not smudge active_cache or active_nr
2376 * when it fails, so we do not have to worry about
2377 * cleaning it up ourselves either.
2378 */
2379 read_cache();
2380 }
6973dcae
JH
2381 if (options->abbrev <= 0 || 40 < options->abbrev)
2382 options->abbrev = 40; /* full */
2383
68aacb2f
JH
2384 /*
2385 * It does not make sense to show the first hit we happened
2386 * to have found. It does not make sense not to return with
2387 * exit code in such a case either.
2388 */
8f67f8ae 2389 if (DIFF_OPT_TST(options, QUIET)) {
68aacb2f 2390 options->output_format = DIFF_FORMAT_NO_OUTPUT;
8f67f8ae 2391 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f
JH
2392 }
2393
2394 /*
2395 * If we postprocess in diffcore, we cannot simply return
2396 * upon the first hit. We need to run diff as usual.
2397 */
2398 if (options->pickaxe || options->filter)
8f67f8ae 2399 DIFF_OPT_CLR(options, QUIET);
68aacb2f 2400
6973dcae
JH
2401 return 0;
2402}
2403
d2543b8e 2404static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
2405{
2406 char c, *eq;
2407 int len;
2408
2409 if (*arg != '-')
2410 return 0;
2411 c = *++arg;
2412 if (!c)
2413 return 0;
2414 if (c == arg_short) {
2415 c = *++arg;
2416 if (!c)
2417 return 1;
2418 if (val && isdigit(c)) {
2419 char *end;
2420 int n = strtoul(arg, &end, 10);
2421 if (*end)
2422 return 0;
2423 *val = n;
2424 return 1;
2425 }
2426 return 0;
2427 }
2428 if (c != '-')
2429 return 0;
2430 arg++;
2431 eq = strchr(arg, '=');
2432 if (eq)
2433 len = eq - arg;
2434 else
2435 len = strlen(arg);
2436 if (!len || strncmp(arg, arg_long, len))
2437 return 0;
2438 if (eq) {
2439 int n;
2440 char *end;
2441 if (!isdigit(*++eq))
2442 return 0;
2443 n = strtoul(eq, &end, 10);
2444 if (*end)
2445 return 0;
2446 *val = n;
2447 }
2448 return 1;
2449}
2450
16befb8b
JH
2451static int diff_scoreopt_parse(const char *opt);
2452
6973dcae
JH
2453int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2454{
2455 const char *arg = av[0];
d054680c
PH
2456
2457 /* Output format options */
6973dcae 2458 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
c6744349 2459 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 2460 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 2461 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
2462 else if (!strcmp(arg, "--raw"))
2463 options->output_format |= DIFF_FORMAT_RAW;
8f67f8ae 2464 else if (!strcmp(arg, "--patch-with-raw"))
c6744349 2465 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
8f67f8ae 2466 else if (!strcmp(arg, "--numstat"))
74e2abe5 2467 options->output_format |= DIFF_FORMAT_NUMSTAT;
8f67f8ae 2468 else if (!strcmp(arg, "--shortstat"))
ebd124c6 2469 options->output_format |= DIFF_FORMAT_SHORTSTAT;
7df7c019
LT
2470 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2471 options->output_format |= DIFF_FORMAT_DIRSTAT;
2472 else if (!strcmp(arg, "--cumulative"))
2473 options->output_format |= DIFF_FORMAT_CUMULATIVE;
d054680c
PH
2474 else if (!strcmp(arg, "--check"))
2475 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2476 else if (!strcmp(arg, "--summary"))
2477 options->output_format |= DIFF_FORMAT_SUMMARY;
2478 else if (!strcmp(arg, "--patch-with-stat"))
2479 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2480 else if (!strcmp(arg, "--name-only"))
2481 options->output_format |= DIFF_FORMAT_NAME;
2482 else if (!strcmp(arg, "--name-status"))
2483 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2484 else if (!strcmp(arg, "-s"))
2485 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
cc44c765 2486 else if (!prefixcmp(arg, "--stat")) {
5c5b2ea9
LT
2487 char *end;
2488 int width = options->stat_width;
2489 int name_width = options->stat_name_width;
2490 arg += 6;
2491 end = (char *)arg;
2492
2493 switch (*arg) {
2494 case '-':
cc44c765 2495 if (!prefixcmp(arg, "-width="))
5c5b2ea9 2496 width = strtoul(arg + 7, &end, 10);
cc44c765 2497 else if (!prefixcmp(arg, "-name-width="))
5c5b2ea9
LT
2498 name_width = strtoul(arg + 12, &end, 10);
2499 break;
2500 case '=':
2501 width = strtoul(arg+1, &end, 10);
2502 if (*end == ',')
2503 name_width = strtoul(end+1, &end, 10);
2504 }
2505
2506 /* Important! This checks all the error cases! */
2507 if (*end)
2508 return 0;
c6744349 2509 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5c5b2ea9
LT
2510 options->stat_name_width = name_width;
2511 options->stat_width = width;
a2540023 2512 }
d054680c
PH
2513
2514 /* renames options */
cc44c765 2515 else if (!prefixcmp(arg, "-B")) {
8f67f8ae 2516 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2517 return -1;
2518 }
cc44c765 2519 else if (!prefixcmp(arg, "-M")) {
8f67f8ae 2520 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2521 return -1;
2522 options->detect_rename = DIFF_DETECT_RENAME;
2523 }
cc44c765 2524 else if (!prefixcmp(arg, "-C")) {
ca6c0970 2525 if (options->detect_rename == DIFF_DETECT_COPY)
8f67f8ae
PH
2526 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2527 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2528 return -1;
2529 options->detect_rename = DIFF_DETECT_COPY;
2530 }
d054680c
PH
2531 else if (!strcmp(arg, "--no-renames"))
2532 options->detect_rename = 0;
cd676a51
JH
2533 else if (!strcmp(arg, "--relative"))
2534 DIFF_OPT_SET(options, RELATIVE_NAME);
c0cb4a06
JH
2535 else if (!prefixcmp(arg, "--relative=")) {
2536 DIFF_OPT_SET(options, RELATIVE_NAME);
2537 options->prefix = arg + 11;
2538 }
d054680c
PH
2539
2540 /* xdiff options */
2541 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2542 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2543 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2544 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2545 else if (!strcmp(arg, "--ignore-space-at-eol"))
2546 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2547
2548 /* flags options */
2549 else if (!strcmp(arg, "--binary")) {
2550 options->output_format |= DIFF_FORMAT_PATCH;
2551 DIFF_OPT_SET(options, BINARY);
2552 }
2553 else if (!strcmp(arg, "--full-index"))
2554 DIFF_OPT_SET(options, FULL_INDEX);
2555 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2556 DIFF_OPT_SET(options, TEXT);
2557 else if (!strcmp(arg, "-R"))
2558 DIFF_OPT_SET(options, REVERSE_DIFF);
6973dcae 2559 else if (!strcmp(arg, "--find-copies-harder"))
8f67f8ae 2560 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
750f7b66 2561 else if (!strcmp(arg, "--follow"))
8f67f8ae 2562 DIFF_OPT_SET(options, FOLLOW_RENAMES);
cd112cef 2563 else if (!strcmp(arg, "--color"))
8f67f8ae 2564 DIFF_OPT_SET(options, COLOR_DIFF);
fef88bb0 2565 else if (!strcmp(arg, "--no-color"))
8f67f8ae 2566 DIFF_OPT_CLR(options, COLOR_DIFF);
f59a59e2 2567 else if (!strcmp(arg, "--color-words"))
8f67f8ae 2568 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
41bbf9d5 2569 else if (!strcmp(arg, "--exit-code"))
8f67f8ae 2570 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f 2571 else if (!strcmp(arg, "--quiet"))
8f67f8ae 2572 DIFF_OPT_SET(options, QUIET);
72909bef 2573 else if (!strcmp(arg, "--ext-diff"))
8f67f8ae 2574 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
72909bef 2575 else if (!strcmp(arg, "--no-ext-diff"))
8f67f8ae 2576 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
50fd9bd8
JS
2577 else if (!strcmp(arg, "--ignore-submodules"))
2578 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
d054680c
PH
2579
2580 /* misc options */
2581 else if (!strcmp(arg, "-z"))
2582 options->line_termination = 0;
2583 else if (!prefixcmp(arg, "-l"))
2584 options->rename_limit = strtoul(arg+2, NULL, 10);
2585 else if (!prefixcmp(arg, "-S"))
2586 options->pickaxe = arg + 2;
2587 else if (!strcmp(arg, "--pickaxe-all"))
2588 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2589 else if (!strcmp(arg, "--pickaxe-regex"))
2590 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2591 else if (!prefixcmp(arg, "-O"))
2592 options->orderfile = arg + 2;
2593 else if (!prefixcmp(arg, "--diff-filter="))
2594 options->filter = arg + 14;
2595 else if (!strcmp(arg, "--abbrev"))
2596 options->abbrev = DEFAULT_ABBREV;
2597 else if (!prefixcmp(arg, "--abbrev=")) {
2598 options->abbrev = strtoul(arg + 9, NULL, 10);
2599 if (options->abbrev < MINIMUM_ABBREV)
2600 options->abbrev = MINIMUM_ABBREV;
2601 else if (40 < options->abbrev)
2602 options->abbrev = 40;
2603 }
eab9a40b
JS
2604 else if (!prefixcmp(arg, "--src-prefix="))
2605 options->a_prefix = arg + 13;
2606 else if (!prefixcmp(arg, "--dst-prefix="))
2607 options->b_prefix = arg + 13;
2608 else if (!strcmp(arg, "--no-prefix"))
2609 options->a_prefix = options->b_prefix = "";
c0c77734
DB
2610 else if (!prefixcmp(arg, "--output=")) {
2611 options->file = fopen(arg + strlen("--output="), "w");
2612 options->close_file = 1;
2613 } else
6973dcae
JH
2614 return 0;
2615 return 1;
2616}
2617
2618static int parse_num(const char **cp_p)
2619{
2620 unsigned long num, scale;
2621 int ch, dot;
2622 const char *cp = *cp_p;
2623
2624 num = 0;
2625 scale = 1;
2626 dot = 0;
2627 for(;;) {
2628 ch = *cp;
2629 if ( !dot && ch == '.' ) {
2630 scale = 1;
2631 dot = 1;
2632 } else if ( ch == '%' ) {
2633 scale = dot ? scale*100 : 100;
2634 cp++; /* % is always at the end */
2635 break;
2636 } else if ( ch >= '0' && ch <= '9' ) {
2637 if ( scale < 100000 ) {
2638 scale *= 10;
2639 num = (num*10) + (ch-'0');
2640 }
2641 } else {
2642 break;
2643 }
2644 cp++;
2645 }
2646 *cp_p = cp;
2647
2648 /* user says num divided by scale and we say internally that
2649 * is MAX_SCORE * num / scale.
2650 */
dc49cd76 2651 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
6973dcae
JH
2652}
2653
16befb8b 2654static int diff_scoreopt_parse(const char *opt)
6973dcae
JH
2655{
2656 int opt1, opt2, cmd;
2657
2658 if (*opt++ != '-')
2659 return -1;
2660 cmd = *opt++;
2661 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2662 return -1; /* that is not a -M, -C nor -B option */
2663
2664 opt1 = parse_num(&opt);
2665 if (cmd != 'B')
2666 opt2 = 0;
2667 else {
2668 if (*opt == 0)
2669 opt2 = 0;
2670 else if (*opt != '/')
2671 return -1; /* we expect -B80/99 or -B80 */
2672 else {
2673 opt++;
2674 opt2 = parse_num(&opt);
2675 }
2676 }
2677 if (*opt != 0)
2678 return -1;
2679 return opt1 | (opt2 << 16);
2680}
2681
2682struct diff_queue_struct diff_queued_diff;
2683
2684void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2685{
2686 if (queue->alloc <= queue->nr) {
2687 queue->alloc = alloc_nr(queue->alloc);
2688 queue->queue = xrealloc(queue->queue,
2689 sizeof(dp) * queue->alloc);
2690 }
2691 queue->queue[queue->nr++] = dp;
2692}
2693
2694struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2695 struct diff_filespec *one,
2696 struct diff_filespec *two)
2697{
ef677686 2698 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
6973dcae
JH
2699 dp->one = one;
2700 dp->two = two;
6973dcae
JH
2701 if (queue)
2702 diff_q(queue, dp);
2703 return dp;
2704}
2705
2706void diff_free_filepair(struct diff_filepair *p)
2707{
9fb88419
LT
2708 free_filespec(p->one);
2709 free_filespec(p->two);
6973dcae
JH
2710 free(p);
2711}
2712
2713/* This is different from find_unique_abbrev() in that
2714 * it stuffs the result with dots for alignment.
2715 */
2716const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2717{
2718 int abblen;
2719 const char *abbrev;
2720 if (len == 40)
2721 return sha1_to_hex(sha1);
2722
2723 abbrev = find_unique_abbrev(sha1, len);
6973dcae
JH
2724 abblen = strlen(abbrev);
2725 if (abblen < 37) {
2726 static char hex[41];
2727 if (len < abblen && abblen <= len + 2)
2728 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2729 else
2730 sprintf(hex, "%s...", abbrev);
2731 return hex;
2732 }
2733 return sha1_to_hex(sha1);
2734}
2735
663af342 2736static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
6973dcae 2737{
663af342
PH
2738 int line_termination = opt->line_termination;
2739 int inter_name_termination = line_termination ? '\t' : '\0';
6973dcae 2740
663af342 2741 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
c0c77734
DB
2742 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2743 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2744 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
6973dcae 2745 }
663af342 2746 if (p->score) {
c0c77734
DB
2747 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2748 inter_name_termination);
663af342 2749 } else {
c0c77734 2750 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
6973dcae 2751 }
6973dcae 2752
cd676a51
JH
2753 if (p->status == DIFF_STATUS_COPIED ||
2754 p->status == DIFF_STATUS_RENAMED) {
2755 const char *name_a, *name_b;
2756 name_a = p->one->path;
2757 name_b = p->two->path;
2758 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734
DB
2759 write_name_quoted(name_a, opt->file, inter_name_termination);
2760 write_name_quoted(name_b, opt->file, line_termination);
663af342 2761 } else {
cd676a51
JH
2762 const char *name_a, *name_b;
2763 name_a = p->one->mode ? p->one->path : p->two->path;
2764 name_b = NULL;
2765 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734 2766 write_name_quoted(name_a, opt->file, line_termination);
663af342 2767 }
6973dcae
JH
2768}
2769
2770int diff_unmodified_pair(struct diff_filepair *p)
2771{
2772 /* This function is written stricter than necessary to support
2773 * the currently implemented transformers, but the idea is to
2774 * let transformers to produce diff_filepairs any way they want,
2775 * and filter and clean them up here before producing the output.
2776 */
663af342 2777 struct diff_filespec *one = p->one, *two = p->two;
6973dcae
JH
2778
2779 if (DIFF_PAIR_UNMERGED(p))
2780 return 0; /* unmerged is interesting */
2781
6973dcae
JH
2782 /* deletion, addition, mode or type change
2783 * and rename are all interesting.
2784 */
2785 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2786 DIFF_PAIR_MODE_CHANGED(p) ||
2787 strcmp(one->path, two->path))
2788 return 0;
2789
2790 /* both are valid and point at the same path. that is, we are
2791 * dealing with a change.
2792 */
2793 if (one->sha1_valid && two->sha1_valid &&
a89fccd2 2794 !hashcmp(one->sha1, two->sha1))
6973dcae
JH
2795 return 1; /* no change */
2796 if (!one->sha1_valid && !two->sha1_valid)
2797 return 1; /* both look at the same file on the filesystem. */
2798 return 0;
2799}
2800
2801static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2802{
2803 if (diff_unmodified_pair(p))
2804 return;
2805
2806 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2807 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2808 return; /* no tree diffs in patch format */
2809
2810 run_diff(p, o);
2811}
2812
2813static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2814 struct diffstat_t *diffstat)
2815{
2816 if (diff_unmodified_pair(p))
2817 return;
2818
2819 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2820 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2821 return; /* no tree diffs in patch format */
2822
2823 run_diffstat(p, o, diffstat);
2824}
2825
88246898
JS
2826static void diff_flush_checkdiff(struct diff_filepair *p,
2827 struct diff_options *o)
2828{
2829 if (diff_unmodified_pair(p))
2830 return;
2831
2832 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2833 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2834 return; /* no tree diffs in patch format */
2835
2836 run_checkdiff(p, o);
2837}
2838
6973dcae
JH
2839int diff_queue_is_empty(void)
2840{
2841 struct diff_queue_struct *q = &diff_queued_diff;
2842 int i;
2843 for (i = 0; i < q->nr; i++)
2844 if (!diff_unmodified_pair(q->queue[i]))
2845 return 0;
2846 return 1;
2847}
2848
2849#if DIFF_DEBUG
2850void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2851{
2852 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2853 x, one ? one : "",
2854 s->path,
2855 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2856 s->mode,
2857 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2858 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2859 x, one ? one : "",
2860 s->size, s->xfrm_flags);
2861}
2862
2863void diff_debug_filepair(const struct diff_filepair *p, int i)
2864{
2865 diff_debug_filespec(p->one, i, "one");
2866 diff_debug_filespec(p->two, i, "two");
64479711 2867 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
6973dcae 2868 p->score, p->status ? p->status : '?',
64479711 2869 p->one->rename_used, p->broken_pair);
6973dcae
JH
2870}
2871
2872void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2873{
2874 int i;
2875 if (msg)
2876 fprintf(stderr, "%s\n", msg);
2877 fprintf(stderr, "q->nr = %d\n", q->nr);
2878 for (i = 0; i < q->nr; i++) {
2879 struct diff_filepair *p = q->queue[i];
2880 diff_debug_filepair(p, i);
2881 }
2882}
2883#endif
2884
2885static void diff_resolve_rename_copy(void)
2886{
64479711
LT
2887 int i;
2888 struct diff_filepair *p;
6973dcae
JH
2889 struct diff_queue_struct *q = &diff_queued_diff;
2890
2891 diff_debug_queue("resolve-rename-copy", q);
2892
2893 for (i = 0; i < q->nr; i++) {
2894 p = q->queue[i];
2895 p->status = 0; /* undecided */
2896 if (DIFF_PAIR_UNMERGED(p))
2897 p->status = DIFF_STATUS_UNMERGED;
2898 else if (!DIFF_FILE_VALID(p->one))
2899 p->status = DIFF_STATUS_ADDED;
2900 else if (!DIFF_FILE_VALID(p->two))
2901 p->status = DIFF_STATUS_DELETED;
2902 else if (DIFF_PAIR_TYPE_CHANGED(p))
2903 p->status = DIFF_STATUS_TYPE_CHANGED;
2904
2905 /* from this point on, we are dealing with a pair
2906 * whose both sides are valid and of the same type, i.e.
2907 * either in-place edit or rename/copy edit.
2908 */
2909 else if (DIFF_PAIR_RENAME(p)) {
64479711
LT
2910 /*
2911 * A rename might have re-connected a broken
2912 * pair up, causing the pathnames to be the
2913 * same again. If so, that's not a rename at
2914 * all, just a modification..
2915 *
2916 * Otherwise, see if this source was used for
2917 * multiple renames, in which case we decrement
2918 * the count, and call it a copy.
6973dcae 2919 */
64479711
LT
2920 if (!strcmp(p->one->path, p->two->path))
2921 p->status = DIFF_STATUS_MODIFIED;
2922 else if (--p->one->rename_used > 0)
6973dcae 2923 p->status = DIFF_STATUS_COPIED;
64479711 2924 else
6973dcae
JH
2925 p->status = DIFF_STATUS_RENAMED;
2926 }
a89fccd2 2927 else if (hashcmp(p->one->sha1, p->two->sha1) ||
d516c2d1
JS
2928 p->one->mode != p->two->mode ||
2929 is_null_sha1(p->one->sha1))
6973dcae
JH
2930 p->status = DIFF_STATUS_MODIFIED;
2931 else {
2932 /* This is a "no-change" entry and should not
2933 * happen anymore, but prepare for broken callers.
2934 */
2935 error("feeding unmodified %s to diffcore",
2936 p->one->path);
2937 p->status = DIFF_STATUS_UNKNOWN;
2938 }
2939 }
2940 diff_debug_queue("resolve-rename-copy done", q);
2941}
2942
c6744349 2943static int check_pair_status(struct diff_filepair *p)
6973dcae 2944{
6973dcae
JH
2945 switch (p->status) {
2946 case DIFF_STATUS_UNKNOWN:
c6744349 2947 return 0;
6973dcae
JH
2948 case 0:
2949 die("internal error in diff-resolve-rename-copy");
6973dcae 2950 default:
c6744349 2951 return 1;
6973dcae
JH
2952 }
2953}
2954
c6744349
TH
2955static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2956{
2957 int fmt = opt->output_format;
2958
2959 if (fmt & DIFF_FORMAT_CHECKDIFF)
2960 diff_flush_checkdiff(p, opt);
2961 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2962 diff_flush_raw(p, opt);
cd676a51
JH
2963 else if (fmt & DIFF_FORMAT_NAME) {
2964 const char *name_a, *name_b;
2965 name_a = p->two->path;
2966 name_b = NULL;
2967 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734 2968 write_name_quoted(name_a, opt->file, opt->line_termination);
cd676a51 2969 }
c6744349
TH
2970}
2971
c0c77734 2972static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4bbd261b
SE
2973{
2974 if (fs->mode)
c0c77734 2975 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4bbd261b 2976 else
c0c77734
DB
2977 fprintf(file, " %s ", newdelete);
2978 write_name_quoted(fs->path, file, '\n');
4bbd261b
SE
2979}
2980
2981
c0c77734 2982static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
4bbd261b
SE
2983{
2984 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
c0c77734 2985 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
663af342 2986 show_name ? ' ' : '\n');
0d26a64e 2987 if (show_name) {
c0c77734 2988 write_name_quoted(p->two->path, file, '\n');
0d26a64e 2989 }
4bbd261b
SE
2990 }
2991}
2992
c0c77734 2993static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
4bbd261b 2994{
b9f44164 2995 char *names = pprint_rename(p->one->path, p->two->path);
4bbd261b 2996
c0c77734 2997 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
b9f44164 2998 free(names);
c0c77734 2999 show_mode_change(file, p, 0);
4bbd261b
SE
3000}
3001
c0c77734 3002static void diff_summary(FILE *file, struct diff_filepair *p)
4bbd261b
SE
3003{
3004 switch(p->status) {
3005 case DIFF_STATUS_DELETED:
c0c77734 3006 show_file_mode_name(file, "delete", p->one);
4bbd261b
SE
3007 break;
3008 case DIFF_STATUS_ADDED:
c0c77734 3009 show_file_mode_name(file, "create", p->two);
4bbd261b
SE
3010 break;
3011 case DIFF_STATUS_COPIED:
c0c77734 3012 show_rename_copy(file, "copy", p);
4bbd261b
SE
3013 break;
3014 case DIFF_STATUS_RENAMED:
c0c77734 3015 show_rename_copy(file, "rename", p);
4bbd261b
SE
3016 break;
3017 default:
3018 if (p->score) {
c0c77734
DB
3019 fputs(" rewrite ", file);
3020 write_name_quoted(p->two->path, file, ' ');
3021 fprintf(file, "(%d%%)\n", similarity_index(p));
663af342 3022 }
c0c77734 3023 show_mode_change(file, p, !p->score);
4bbd261b
SE
3024 break;
3025 }
3026}
3027
fcb3d0ad
JS
3028struct patch_id_t {
3029 struct xdiff_emit_state xm;
3030 SHA_CTX *ctx;
3031 int patchlen;
3032};
3033
3034static int remove_space(char *line, int len)
3035{
3036 int i;
663af342
PH
3037 char *dst = line;
3038 unsigned char c;
fcb3d0ad 3039
663af342
PH
3040 for (i = 0; i < len; i++)
3041 if (!isspace((c = line[i])))
3042 *dst++ = c;
fcb3d0ad 3043
663af342 3044 return dst - line;
fcb3d0ad
JS
3045}
3046
3047static void patch_id_consume(void *priv, char *line, unsigned long len)
3048{
3049 struct patch_id_t *data = priv;
3050 int new_len;
3051
3052 /* Ignore line numbers when computing the SHA1 of the patch */
cc44c765 3053 if (!prefixcmp(line, "@@ -"))
fcb3d0ad
JS
3054 return;
3055
3056 new_len = remove_space(line, len);
3057
3058 SHA1_Update(data->ctx, line, new_len);
3059 data->patchlen += new_len;
3060}
3061
3062/* returns 0 upon success, and writes result into sha1 */
3063static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3064{
3065 struct diff_queue_struct *q = &diff_queued_diff;
3066 int i;
3067 SHA_CTX ctx;
3068 struct patch_id_t data;
3069 char buffer[PATH_MAX * 4 + 20];
3070
3071 SHA1_Init(&ctx);
3072 memset(&data, 0, sizeof(struct patch_id_t));
3073 data.ctx = &ctx;
3074 data.xm.consume = patch_id_consume;
3075
3076 for (i = 0; i < q->nr; i++) {
3077 xpparam_t xpp;
3078 xdemitconf_t xecfg;
3079 xdemitcb_t ecb;
3080 mmfile_t mf1, mf2;
3081 struct diff_filepair *p = q->queue[i];
3082 int len1, len2;
3083
30b25010 3084 memset(&xecfg, 0, sizeof(xecfg));
fcb3d0ad
JS
3085 if (p->status == 0)
3086 return error("internal diff status error");
3087 if (p->status == DIFF_STATUS_UNKNOWN)
3088 continue;
3089 if (diff_unmodified_pair(p))
3090 continue;
3091 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3092 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3093 continue;
3094 if (DIFF_PAIR_UNMERGED(p))
3095 continue;
3096
3097 diff_fill_sha1_info(p->one);
3098 diff_fill_sha1_info(p->two);
3099 if (fill_mmfile(&mf1, p->one) < 0 ||
3100 fill_mmfile(&mf2, p->two) < 0)
3101 return error("unable to read files to diff");
3102
fcb3d0ad
JS
3103 len1 = remove_space(p->one->path, strlen(p->one->path));
3104 len2 = remove_space(p->two->path, strlen(p->two->path));
3105 if (p->one->mode == 0)
3106 len1 = snprintf(buffer, sizeof(buffer),
3107 "diff--gita/%.*sb/%.*s"
3108 "newfilemode%06o"
3109 "---/dev/null"
3110 "+++b/%.*s",
3111 len1, p->one->path,
3112 len2, p->two->path,
3113 p->two->mode,
3114 len2, p->two->path);
3115 else if (p->two->mode == 0)
3116 len1 = snprintf(buffer, sizeof(buffer),
3117 "diff--gita/%.*sb/%.*s"
3118 "deletedfilemode%06o"
3119 "---a/%.*s"
3120 "+++/dev/null",
3121 len1, p->one->path,
3122 len2, p->two->path,
3123 p->one->mode,
3124 len1, p->one->path);
3125 else
3126 len1 = snprintf(buffer, sizeof(buffer),
3127 "diff--gita/%.*sb/%.*s"
3128 "---a/%.*s"
3129 "+++b/%.*s",
3130 len1, p->one->path,
3131 len2, p->two->path,
3132 len1, p->one->path,
3133 len2, p->two->path);
3134 SHA1_Update(&ctx, buffer, len1);
3135
3136 xpp.flags = XDF_NEED_MINIMAL;
3137 xecfg.ctxlen = 3;
9fdc3bb5 3138 xecfg.flags = XDL_EMIT_FUNCNAMES;
fcb3d0ad
JS
3139 ecb.outf = xdiff_outf;
3140 ecb.priv = &data;
c279d7e9 3141 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
fcb3d0ad
JS
3142 }
3143
3144 SHA1_Final(sha1, &ctx);
3145 return 0;
3146}
3147
3148int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3149{
3150 struct diff_queue_struct *q = &diff_queued_diff;
3151 int i;
3152 int result = diff_get_patch_id(options, sha1);
3153
3154 for (i = 0; i < q->nr; i++)
3155 diff_free_filepair(q->queue[i]);
3156
3157 free(q->queue);
3158 q->queue = NULL;
3159 q->nr = q->alloc = 0;
3160
3161 return result;
3162}
3163
946c3784 3164static int is_summary_empty(const struct diff_queue_struct *q)
6973dcae 3165{
6973dcae 3166 int i;
6973dcae 3167
946c3784
TH
3168 for (i = 0; i < q->nr; i++) {
3169 const struct diff_filepair *p = q->queue[i];
3170
3171 switch (p->status) {
3172 case DIFF_STATUS_DELETED:
3173 case DIFF_STATUS_ADDED:
3174 case DIFF_STATUS_COPIED:
3175 case DIFF_STATUS_RENAMED:
3176 return 0;
3177 default:
3178 if (p->score)
3179 return 0;
3180 if (p->one->mode && p->two->mode &&
3181 p->one->mode != p->two->mode)
3182 return 0;
3183 break;
3184 }
6973dcae 3185 }
946c3784
TH
3186 return 1;
3187}
3188
6973dcae
JH
3189void diff_flush(struct diff_options *options)
3190{
3191 struct diff_queue_struct *q = &diff_queued_diff;
c6744349 3192 int i, output_format = options->output_format;
946c3784 3193 int separator = 0;
6973dcae 3194
c6744349
TH
3195 /*
3196 * Order: raw, stat, summary, patch
3197 * or: name/name-status/checkdiff (other bits clear)
3198 */
946c3784
TH
3199 if (!q->nr)
3200 goto free_queue;
6973dcae 3201
c6744349
TH
3202 if (output_format & (DIFF_FORMAT_RAW |
3203 DIFF_FORMAT_NAME |
3204 DIFF_FORMAT_NAME_STATUS |
3205 DIFF_FORMAT_CHECKDIFF)) {
6973dcae
JH
3206 for (i = 0; i < q->nr; i++) {
3207 struct diff_filepair *p = q->queue[i];
c6744349
TH
3208 if (check_pair_status(p))
3209 flush_one_pair(p, options);
6973dcae 3210 }
946c3784 3211 separator++;
6973dcae 3212 }
c6744349 3213
c04a7155 3214 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
5e2b0636 3215 struct diffstat_t diffstat;
c6744349 3216
5e2b0636
TH
3217 memset(&diffstat, 0, sizeof(struct diffstat_t));
3218 diffstat.xm.consume = diffstat_consume;
6973dcae
JH
3219 for (i = 0; i < q->nr; i++) {
3220 struct diff_filepair *p = q->queue[i];
c6744349 3221 if (check_pair_status(p))
5e2b0636 3222 diff_flush_stat(p, options, &diffstat);
6973dcae 3223 }
74e2abe5
JH
3224 if (output_format & DIFF_FORMAT_NUMSTAT)
3225 show_numstat(&diffstat, options);
3226 if (output_format & DIFF_FORMAT_DIFFSTAT)
3227 show_stats(&diffstat, options);
f604652e 3228 if (output_format & DIFF_FORMAT_SHORTSTAT)
c0c77734 3229 show_shortstats(&diffstat, options);
f604652e 3230 free_diffstat_info(&diffstat);
3969cf7d 3231 separator++;
6973dcae 3232 }
c04a7155
JH
3233 if (output_format & DIFF_FORMAT_DIRSTAT)
3234 show_dirstat(options);
6973dcae 3235
946c3784 3236 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
c6744349 3237 for (i = 0; i < q->nr; i++)
c0c77734 3238 diff_summary(options->file, q->queue[i]);
3969cf7d 3239 separator++;
6973dcae
JH
3240 }
3241
c6744349 3242 if (output_format & DIFF_FORMAT_PATCH) {
946c3784 3243 if (separator) {
6b2fbaaf 3244 putc(options->line_termination, options->file);
946c3784
TH
3245 if (options->stat_sep) {
3246 /* attach patch instead of inline */
c0c77734 3247 fputs(options->stat_sep, options->file);
946c3784 3248 }
c6744349
TH
3249 }
3250
3251 for (i = 0; i < q->nr; i++) {
3252 struct diff_filepair *p = q->queue[i];
3253 if (check_pair_status(p))
3254 diff_flush_patch(p, options);
3255 }
4bbd261b
SE
3256 }
3257
04245581
JK
3258 if (output_format & DIFF_FORMAT_CALLBACK)
3259 options->format_callback(q, options, options->format_callback_data);
3260
c6744349
TH
3261 for (i = 0; i < q->nr; i++)
3262 diff_free_filepair(q->queue[i]);
946c3784 3263free_queue:
6973dcae
JH
3264 free(q->queue);
3265 q->queue = NULL;
3266 q->nr = q->alloc = 0;
c0c77734
DB
3267 if (options->close_file)
3268 fclose(options->file);
6973dcae
JH
3269}
3270
3271static void diffcore_apply_filter(const char *filter)
3272{
3273 int i;
3274 struct diff_queue_struct *q = &diff_queued_diff;
3275 struct diff_queue_struct outq;
3276 outq.queue = NULL;
3277 outq.nr = outq.alloc = 0;
3278
3279 if (!filter)
3280 return;
3281
3282 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3283 int found;
3284 for (i = found = 0; !found && i < q->nr; i++) {
3285 struct diff_filepair *p = q->queue[i];
3286 if (((p->status == DIFF_STATUS_MODIFIED) &&
3287 ((p->score &&
3288 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3289 (!p->score &&
3290 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3291 ((p->status != DIFF_STATUS_MODIFIED) &&
3292 strchr(filter, p->status)))
3293 found++;
3294 }
3295 if (found)
3296 return;
3297
3298 /* otherwise we will clear the whole queue
3299 * by copying the empty outq at the end of this
3300 * function, but first clear the current entries
3301 * in the queue.
3302 */
3303 for (i = 0; i < q->nr; i++)
3304 diff_free_filepair(q->queue[i]);
3305 }
3306 else {
3307 /* Only the matching ones */
3308 for (i = 0; i < q->nr; i++) {
3309 struct diff_filepair *p = q->queue[i];
3310
3311 if (((p->status == DIFF_STATUS_MODIFIED) &&
3312 ((p->score &&
3313 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3314 (!p->score &&
3315 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3316 ((p->status != DIFF_STATUS_MODIFIED) &&
3317 strchr(filter, p->status)))
3318 diff_q(&outq, p);
3319 else
3320 diff_free_filepair(p);
3321 }
3322 }
3323 free(q->queue);
3324 *q = outq;
3325}
3326
5701115a
SV
3327/* Check whether two filespecs with the same mode and size are identical */
3328static int diff_filespec_is_identical(struct diff_filespec *one,
3329 struct diff_filespec *two)
3330{
2b459b48
JH
3331 if (S_ISGITLINK(one->mode))
3332 return 0;
5701115a
SV
3333 if (diff_populate_filespec(one, 0))
3334 return 0;
3335 if (diff_populate_filespec(two, 0))
3336 return 0;
3337 return !memcmp(one->data, two->data, one->size);
3338}
3339
fb13227e
JH
3340static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3341{
3342 int i;
3343 struct diff_queue_struct *q = &diff_queued_diff;
3344 struct diff_queue_struct outq;
3345 outq.queue = NULL;
3346 outq.nr = outq.alloc = 0;
3347
3348 for (i = 0; i < q->nr; i++) {
3349 struct diff_filepair *p = q->queue[i];
3350
3351 /*
3352 * 1. Entries that come from stat info dirtyness
3353 * always have both sides (iow, not create/delete),
3354 * one side of the object name is unknown, with
3355 * the same mode and size. Keep the ones that
3356 * do not match these criteria. They have real
3357 * differences.
3358 *
3359 * 2. At this point, the file is known to be modified,
3360 * with the same mode and size, and the object
3361 * name of one side is unknown. Need to inspect
3362 * the identical contents.
3363 */
3364 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3365 !DIFF_FILE_VALID(p->two) ||
3366 (p->one->sha1_valid && p->two->sha1_valid) ||
3367 (p->one->mode != p->two->mode) ||
3368 diff_populate_filespec(p->one, 1) ||
3369 diff_populate_filespec(p->two, 1) ||
3370 (p->one->size != p->two->size) ||
5701115a 3371 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
fb13227e
JH
3372 diff_q(&outq, p);
3373 else {
3374 /*
3375 * The caller can subtract 1 from skip_stat_unmatch
3376 * to determine how many paths were dirty only
3377 * due to stat info mismatch.
3378 */
8f67f8ae 3379 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
6d2d9e86 3380 diffopt->skip_stat_unmatch++;
fb13227e
JH
3381 diff_free_filepair(p);
3382 }
3383 }
3384 free(q->queue);
3385 *q = outq;
3386}
3387
6973dcae
JH
3388void diffcore_std(struct diff_options *options)
3389{
8f67f8ae 3390 if (DIFF_OPT_TST(options, QUIET))
68aacb2f 3391 return;
706098af 3392
8f67f8ae 3393 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
fb13227e 3394 diffcore_skip_stat_unmatch(options);
6973dcae
JH
3395 if (options->break_opt != -1)
3396 diffcore_break(options->break_opt);
3397 if (options->detect_rename)
3398 diffcore_rename(options);
3399 if (options->break_opt != -1)
3400 diffcore_merge_broken();
3401 if (options->pickaxe)
3402 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3403 if (options->orderfile)
3404 diffcore_order(options->orderfile);
3405 diff_resolve_rename_copy();
3406 diffcore_apply_filter(options->filter);
68aacb2f 3407
8f67f8ae
PH
3408 if (diff_queued_diff.nr)
3409 DIFF_OPT_SET(options, HAS_CHANGES);
3410 else
3411 DIFF_OPT_CLR(options, HAS_CHANGES);
6973dcae
JH
3412}
3413
da31b358
JH
3414int diff_result_code(struct diff_options *opt, int status)
3415{
3416 int result = 0;
3417 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3418 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3419 return status;
3420 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3421 DIFF_OPT_TST(opt, HAS_CHANGES))
3422 result |= 01;
3423 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3424 DIFF_OPT_TST(opt, CHECK_FAILED))
3425 result |= 02;
3426 return result;
3427}
6973dcae 3428
6973dcae
JH
3429void diff_addremove(struct diff_options *options,
3430 int addremove, unsigned mode,
3431 const unsigned char *sha1,
fd55a19e 3432 const char *concatpath)
6973dcae 3433{
6973dcae
JH
3434 struct diff_filespec *one, *two;
3435
50fd9bd8
JS
3436 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3437 return;
3438
6973dcae
JH
3439 /* This may look odd, but it is a preparation for
3440 * feeding "there are unchanged files which should
3441 * not produce diffs, but when you are doing copy
3442 * detection you would need them, so here they are"
3443 * entries to the diff-core. They will be prefixed
3444 * with something like '=' or '*' (I haven't decided
3445 * which but should not make any difference).
a6080a0a 3446 * Feeding the same new and old to diff_change()
6973dcae
JH
3447 * also has the same effect.
3448 * Before the final output happens, they are pruned after
3449 * merged into rename/copy pairs as appropriate.
3450 */
8f67f8ae 3451 if (DIFF_OPT_TST(options, REVERSE_DIFF))
6973dcae
JH
3452 addremove = (addremove == '+' ? '-' :
3453 addremove == '-' ? '+' : addremove);
3454
cd676a51
JH
3455 if (options->prefix &&
3456 strncmp(concatpath, options->prefix, options->prefix_length))
3457 return;
3458
6973dcae
JH
3459 one = alloc_filespec(concatpath);
3460 two = alloc_filespec(concatpath);
3461
3462 if (addremove != '+')
3463 fill_filespec(one, sha1, mode);
3464 if (addremove != '-')
3465 fill_filespec(two, sha1, mode);
3466
3467 diff_queue(&diff_queued_diff, one, two);
8f67f8ae 3468 DIFF_OPT_SET(options, HAS_CHANGES);
6973dcae
JH
3469}
3470
3471void diff_change(struct diff_options *options,
3472 unsigned old_mode, unsigned new_mode,
3473 const unsigned char *old_sha1,
3474 const unsigned char *new_sha1,
fd55a19e 3475 const char *concatpath)
6973dcae 3476{
6973dcae
JH
3477 struct diff_filespec *one, *two;
3478
50fd9bd8
JS
3479 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3480 && S_ISGITLINK(new_mode))
3481 return;
3482
8f67f8ae 3483 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
6973dcae
JH
3484 unsigned tmp;
3485 const unsigned char *tmp_c;
3486 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3487 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3488 }
cd676a51
JH
3489
3490 if (options->prefix &&
3491 strncmp(concatpath, options->prefix, options->prefix_length))
3492 return;
3493
6973dcae
JH
3494 one = alloc_filespec(concatpath);
3495 two = alloc_filespec(concatpath);
3496 fill_filespec(one, old_sha1, old_mode);
3497 fill_filespec(two, new_sha1, new_mode);
3498
3499 diff_queue(&diff_queued_diff, one, two);
8f67f8ae 3500 DIFF_OPT_SET(options, HAS_CHANGES);
6973dcae
JH
3501}
3502
3503void diff_unmerge(struct diff_options *options,
e9c84099
JH
3504 const char *path,
3505 unsigned mode, const unsigned char *sha1)
6973dcae
JH
3506{
3507 struct diff_filespec *one, *two;
cd676a51
JH
3508
3509 if (options->prefix &&
3510 strncmp(path, options->prefix, options->prefix_length))
3511 return;
3512
6973dcae
JH
3513 one = alloc_filespec(path);
3514 two = alloc_filespec(path);
e9c84099
JH
3515 fill_filespec(one, sha1, mode);
3516 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
6973dcae 3517}