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Fix typo in 'blame' documentation.
[git/gitweb-caching.git] / diff.c
blob5b8afdcb05abd4f634b49adb2f521fc75e220647
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14
15 #ifdef NO_FAST_WORKING_DIRECTORY
16 #define FAST_WORKING_DIRECTORY 0
17 #else
18 #define FAST_WORKING_DIRECTORY 1
19 #endif
20
21 static int diff_detect_rename_default;
22 static int diff_rename_limit_default = 100;
23 static int diff_use_color_default;
24 static const char *external_diff_cmd_cfg;
25 int diff_auto_refresh_index = 1;
26
27 static char diff_colors[][COLOR_MAXLEN] = {
28 "\033[m", /* reset */
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) */
36 };
37
38 static 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;
50 if (!strcasecmp(var+ofs, "commit"))
51 return DIFF_COMMIT;
52 if (!strcasecmp(var+ofs, "whitespace"))
53 return DIFF_WHITESPACE;
54 die("bad config variable '%s'", var);
55 }
56
57 static struct ll_diff_driver {
58 const char *name;
59 struct ll_diff_driver *next;
60 char *cmd;
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 */
69 static 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) {
81 drv = xcalloc(1, sizeof(struct ll_diff_driver));
82 drv->name = xmemdupz(name, namelen);
83 if (!user_diff_tail)
84 user_diff_tail = &user_diff;
85 *user_diff_tail = drv;
86 user_diff_tail = &(drv->next);
87 }
88
89 if (!value)
90 return error("%s: lacks value", var);
91 drv->cmd = strdup(value);
92 return 0;
93 }
94
95 /*
96 * 'diff.<what>.funcname' attribute can be specified in the configuration
97 * to define a customized regexp to find the beginning of a function to
98 * be used for hunk header lines of "diff -p" style output.
99 */
100 static struct funcname_pattern {
101 char *name;
102 char *pattern;
103 struct funcname_pattern *next;
104 } *funcname_pattern_list;
105
106 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
107 {
108 const char *name;
109 int namelen;
110 struct funcname_pattern *pp;
111
112 name = var + 5; /* "diff." */
113 namelen = ep - name;
114
115 for (pp = funcname_pattern_list; pp; pp = pp->next)
116 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
117 break;
118 if (!pp) {
119 pp = xcalloc(1, sizeof(*pp));
120 pp->name = xmemdupz(name, namelen);
121 pp->next = funcname_pattern_list;
122 funcname_pattern_list = pp;
123 }
124 if (pp->pattern)
125 free(pp->pattern);
126 pp->pattern = xstrdup(value);
127 return 0;
128 }
129
130 /*
131 * These are to give UI layer defaults.
132 * The core-level commands such as git-diff-files should
133 * never be affected by the setting of diff.renames
134 * the user happens to have in the configuration file.
135 */
136 int git_diff_ui_config(const char *var, const char *value)
137 {
138 if (!strcmp(var, "diff.renamelimit")) {
139 diff_rename_limit_default = git_config_int(var, value);
140 return 0;
141 }
142 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
143 diff_use_color_default = git_config_colorbool(var, value, -1);
144 return 0;
145 }
146 if (!strcmp(var, "diff.renames")) {
147 if (!value)
148 diff_detect_rename_default = DIFF_DETECT_RENAME;
149 else if (!strcasecmp(value, "copies") ||
150 !strcasecmp(value, "copy"))
151 diff_detect_rename_default = DIFF_DETECT_COPY;
152 else if (git_config_bool(var,value))
153 diff_detect_rename_default = DIFF_DETECT_RENAME;
154 return 0;
155 }
156 if (!strcmp(var, "diff.autorefreshindex")) {
157 diff_auto_refresh_index = git_config_bool(var, value);
158 return 0;
159 }
160 if (!strcmp(var, "diff.external")) {
161 external_diff_cmd_cfg = xstrdup(value);
162 return 0;
163 }
164 if (!prefixcmp(var, "diff.")) {
165 const char *ep = strrchr(var, '.');
166
167 if (ep != var + 4) {
168 if (!strcmp(ep, ".command"))
169 return parse_lldiff_command(var, ep, value);
170 }
171 }
172
173 return git_diff_basic_config(var, value);
174 }
175
176 int git_diff_basic_config(const char *var, const char *value)
177 {
178 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
179 int slot = parse_diff_color_slot(var, 11);
180 color_parse(value, var, diff_colors[slot]);
181 return 0;
182 }
183
184 if (!prefixcmp(var, "diff.")) {
185 const char *ep = strrchr(var, '.');
186 if (ep != var + 4) {
187 if (!strcmp(ep, ".funcname"))
188 return parse_funcname_pattern(var, ep, value);
189 }
190 }
191
192 return git_default_config(var, value);
193 }
194
195 static char *quote_two(const char *one, const char *two)
196 {
197 int need_one = quote_c_style(one, NULL, NULL, 1);
198 int need_two = quote_c_style(two, NULL, NULL, 1);
199 struct strbuf res;
200
201 strbuf_init(&res, 0);
202 if (need_one + need_two) {
203 strbuf_addch(&res, '"');
204 quote_c_style(one, &res, NULL, 1);
205 quote_c_style(two, &res, NULL, 1);
206 strbuf_addch(&res, '"');
207 } else {
208 strbuf_addstr(&res, one);
209 strbuf_addstr(&res, two);
210 }
211 return strbuf_detach(&res, NULL);
212 }
213
214 static const char *external_diff(void)
215 {
216 static const char *external_diff_cmd = NULL;
217 static int done_preparing = 0;
218
219 if (done_preparing)
220 return external_diff_cmd;
221 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
222 if (!external_diff_cmd)
223 external_diff_cmd = external_diff_cmd_cfg;
224 done_preparing = 1;
225 return external_diff_cmd;
226 }
227
228 static struct diff_tempfile {
229 const char *name; /* filename external diff should read from */
230 char hex[41];
231 char mode[10];
232 char tmp_path[PATH_MAX];
233 } diff_temp[2];
234
235 static int count_lines(const char *data, int size)
236 {
237 int count, ch, completely_empty = 1, nl_just_seen = 0;
238 count = 0;
239 while (0 < size--) {
240 ch = *data++;
241 if (ch == '\n') {
242 count++;
243 nl_just_seen = 1;
244 completely_empty = 0;
245 }
246 else {
247 nl_just_seen = 0;
248 completely_empty = 0;
249 }
250 }
251 if (completely_empty)
252 return 0;
253 if (!nl_just_seen)
254 count++; /* no trailing newline */
255 return count;
256 }
257
258 static void print_line_count(int count)
259 {
260 switch (count) {
261 case 0:
262 printf("0,0");
263 break;
264 case 1:
265 printf("1");
266 break;
267 default:
268 printf("1,%d", count);
269 break;
270 }
271 }
272
273 static void copy_file(int prefix, const char *data, int size,
274 const char *set, const char *reset)
275 {
276 int ch, nl_just_seen = 1;
277 while (0 < size--) {
278 ch = *data++;
279 if (nl_just_seen) {
280 fputs(set, stdout);
281 putchar(prefix);
282 }
283 if (ch == '\n') {
284 nl_just_seen = 1;
285 fputs(reset, stdout);
286 } else
287 nl_just_seen = 0;
288 putchar(ch);
289 }
290 if (!nl_just_seen)
291 printf("%s\n\\ No newline at end of file\n", reset);
292 }
293
294 static void emit_rewrite_diff(const char *name_a,
295 const char *name_b,
296 struct diff_filespec *one,
297 struct diff_filespec *two,
298 struct diff_options *o)
299 {
300 int lc_a, lc_b;
301 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
302 const char *name_a_tab, *name_b_tab;
303 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
304 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
305 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
306 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
307 const char *reset = diff_get_color(color_diff, DIFF_RESET);
308 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
309
310 name_a += (*name_a == '/');
311 name_b += (*name_b == '/');
312 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
313 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
314
315 strbuf_reset(&a_name);
316 strbuf_reset(&b_name);
317 quote_two_c_style(&a_name, o->a_prefix, name_a, 0);
318 quote_two_c_style(&b_name, o->b_prefix, name_b, 0);
319
320 diff_populate_filespec(one, 0);
321 diff_populate_filespec(two, 0);
322 lc_a = count_lines(one->data, one->size);
323 lc_b = count_lines(two->data, two->size);
324 printf("%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(lc_a);
328 printf(" +");
329 print_line_count(lc_b);
330 printf(" @@%s\n", reset);
331 if (lc_a)
332 copy_file('-', one->data, one->size, old, reset);
333 if (lc_b)
334 copy_file('+', two->data, two->size, new, reset);
335 }
336
337 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
338 {
339 if (!DIFF_FILE_VALID(one)) {
340 mf->ptr = (char *)""; /* does not matter */
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
351 struct diff_words_buffer {
352 mmfile_t text;
353 long alloc;
354 long current; /* output pointer */
355 int suppressed_newline;
356 };
357
358 static 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
371 struct diff_words_data {
372 struct xdiff_emit_state xm;
373 struct diff_words_buffer minus, plus;
374 };
375
376 static void print_word(struct diff_words_buffer *buffer, int len, int color,
377 int suppress_newline)
378 {
379 const char *ptr;
380 int eol = 0;
381
382 if (len == 0)
383 return;
384
385 ptr = buffer->text.ptr + buffer->current;
386 buffer->current += len;
387
388 if (ptr[len - 1] == '\n') {
389 eol = 1;
390 len--;
391 }
392
393 fputs(diff_get_color(1, color), stdout);
394 fwrite(ptr, len, 1, stdout);
395 fputs(diff_get_color(1, DIFF_RESET), stdout);
396
397 if (eol) {
398 if (suppress_newline)
399 buffer->suppressed_newline = 1;
400 else
401 putchar('\n');
402 }
403 }
404
405 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
406 {
407 struct diff_words_data *diff_words = priv;
408
409 if (diff_words->minus.suppressed_newline) {
410 if (line[0] != '+')
411 putchar('\n');
412 diff_words->minus.suppressed_newline = 0;
413 }
414
415 len--;
416 switch (line[0]) {
417 case '-':
418 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
419 break;
420 case '+':
421 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
422 break;
423 case ' ':
424 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
425 diff_words->minus.current += len;
426 break;
427 }
428 }
429
430 /* this executes the word diff on the accumulated buffers */
431 static void diff_words_show(struct diff_words_data *diff_words)
432 {
433 xpparam_t xpp;
434 xdemitconf_t xecfg;
435 xdemitcb_t ecb;
436 mmfile_t minus, plus;
437 int i;
438
439 memset(&xecfg, 0, sizeof(xecfg));
440 minus.size = diff_words->minus.text.size;
441 minus.ptr = xmalloc(minus.size);
442 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
443 for (i = 0; i < minus.size; i++)
444 if (isspace(minus.ptr[i]))
445 minus.ptr[i] = '\n';
446 diff_words->minus.current = 0;
447
448 plus.size = diff_words->plus.text.size;
449 plus.ptr = xmalloc(plus.size);
450 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
451 for (i = 0; i < plus.size; i++)
452 if (isspace(plus.ptr[i]))
453 plus.ptr[i] = '\n';
454 diff_words->plus.current = 0;
455
456 xpp.flags = XDF_NEED_MINIMAL;
457 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
458 ecb.outf = xdiff_outf;
459 ecb.priv = diff_words;
460 diff_words->xm.consume = fn_out_diff_words_aux;
461 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
462
463 free(minus.ptr);
464 free(plus.ptr);
465 diff_words->minus.text.size = diff_words->plus.text.size = 0;
466
467 if (diff_words->minus.suppressed_newline) {
468 putchar('\n');
469 diff_words->minus.suppressed_newline = 0;
470 }
471 }
472
473 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
474
475 struct emit_callback {
476 struct xdiff_emit_state xm;
477 int nparents, color_diff;
478 unsigned ws_rule;
479 sane_truncate_fn truncate;
480 const char **label_path;
481 struct diff_words_data *diff_words;
482 int *found_changesp;
483 };
484
485 static void free_diff_words_data(struct emit_callback *ecbdata)
486 {
487 if (ecbdata->diff_words) {
488 /* flush buffers */
489 if (ecbdata->diff_words->minus.text.size ||
490 ecbdata->diff_words->plus.text.size)
491 diff_words_show(ecbdata->diff_words);
492
493 if (ecbdata->diff_words->minus.text.ptr)
494 free (ecbdata->diff_words->minus.text.ptr);
495 if (ecbdata->diff_words->plus.text.ptr)
496 free (ecbdata->diff_words->plus.text.ptr);
497 free(ecbdata->diff_words);
498 ecbdata->diff_words = NULL;
499 }
500 }
501
502 const char *diff_get_color(int diff_use_color, enum color_diff ix)
503 {
504 if (diff_use_color)
505 return diff_colors[ix];
506 return "";
507 }
508
509 static void emit_line(const char *set, const char *reset, const char *line, int len)
510 {
511 fputs(set, stdout);
512 fwrite(line, len, 1, stdout);
513 fputs(reset, stdout);
514 }
515
516 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
517 {
518 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
519 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
520
521 if (!*ws)
522 emit_line(set, reset, line, len);
523 else {
524 /* Emit just the prefix, then the rest. */
525 emit_line(set, reset, line, ecbdata->nparents);
526 (void)check_and_emit_line(line + ecbdata->nparents,
527 len - ecbdata->nparents, ecbdata->ws_rule,
528 stdout, set, reset, ws);
529 }
530 }
531
532 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
533 {
534 const char *cp;
535 unsigned long allot;
536 size_t l = len;
537
538 if (ecb->truncate)
539 return ecb->truncate(line, len);
540 cp = line;
541 allot = l;
542 while (0 < l) {
543 (void) utf8_width(&cp, &l);
544 if (!cp)
545 break; /* truncated in the middle? */
546 }
547 return allot - l;
548 }
549
550 static void fn_out_consume(void *priv, char *line, unsigned long len)
551 {
552 int i;
553 int color;
554 struct emit_callback *ecbdata = priv;
555 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
556 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
557 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
558
559 *(ecbdata->found_changesp) = 1;
560
561 if (ecbdata->label_path[0]) {
562 const char *name_a_tab, *name_b_tab;
563
564 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
565 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
566
567 printf("%s--- %s%s%s\n",
568 meta, ecbdata->label_path[0], reset, name_a_tab);
569 printf("%s+++ %s%s%s\n",
570 meta, ecbdata->label_path[1], reset, name_b_tab);
571 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
572 }
573
574 /* This is not really necessary for now because
575 * this codepath only deals with two-way diffs.
576 */
577 for (i = 0; i < len && line[i] == '@'; i++)
578 ;
579 if (2 <= i && i < len && line[i] == ' ') {
580 ecbdata->nparents = i - 1;
581 len = sane_truncate_line(ecbdata, line, len);
582 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
583 reset, line, len);
584 if (line[len-1] != '\n')
585 putchar('\n');
586 return;
587 }
588
589 if (len < ecbdata->nparents) {
590 emit_line(reset, reset, line, len);
591 return;
592 }
593
594 color = DIFF_PLAIN;
595 if (ecbdata->diff_words && ecbdata->nparents != 1)
596 /* fall back to normal diff */
597 free_diff_words_data(ecbdata);
598 if (ecbdata->diff_words) {
599 if (line[0] == '-') {
600 diff_words_append(line, len,
601 &ecbdata->diff_words->minus);
602 return;
603 } else if (line[0] == '+') {
604 diff_words_append(line, len,
605 &ecbdata->diff_words->plus);
606 return;
607 }
608 if (ecbdata->diff_words->minus.text.size ||
609 ecbdata->diff_words->plus.text.size)
610 diff_words_show(ecbdata->diff_words);
611 line++;
612 len--;
613 emit_line(plain, reset, line, len);
614 return;
615 }
616 for (i = 0; i < ecbdata->nparents && len; i++) {
617 if (line[i] == '-')
618 color = DIFF_FILE_OLD;
619 else if (line[i] == '+')
620 color = DIFF_FILE_NEW;
621 }
622
623 if (color != DIFF_FILE_NEW) {
624 emit_line(diff_get_color(ecbdata->color_diff, color),
625 reset, line, len);
626 return;
627 }
628 emit_add_line(reset, ecbdata, line, len);
629 }
630
631 static char *pprint_rename(const char *a, const char *b)
632 {
633 const char *old = a;
634 const char *new = b;
635 struct strbuf name;
636 int pfx_length, sfx_length;
637 int len_a = strlen(a);
638 int len_b = strlen(b);
639 int a_midlen, b_midlen;
640 int qlen_a = quote_c_style(a, NULL, NULL, 0);
641 int qlen_b = quote_c_style(b, NULL, NULL, 0);
642
643 strbuf_init(&name, 0);
644 if (qlen_a || qlen_b) {
645 quote_c_style(a, &name, NULL, 0);
646 strbuf_addstr(&name, " => ");
647 quote_c_style(b, &name, NULL, 0);
648 return strbuf_detach(&name, NULL);
649 }
650
651 /* Find common prefix */
652 pfx_length = 0;
653 while (*old && *new && *old == *new) {
654 if (*old == '/')
655 pfx_length = old - a + 1;
656 old++;
657 new++;
658 }
659
660 /* Find common suffix */
661 old = a + len_a;
662 new = b + len_b;
663 sfx_length = 0;
664 while (a <= old && b <= new && *old == *new) {
665 if (*old == '/')
666 sfx_length = len_a - (old - a);
667 old--;
668 new--;
669 }
670
671 /*
672 * pfx{mid-a => mid-b}sfx
673 * {pfx-a => pfx-b}sfx
674 * pfx{sfx-a => sfx-b}
675 * name-a => name-b
676 */
677 a_midlen = len_a - pfx_length - sfx_length;
678 b_midlen = len_b - pfx_length - sfx_length;
679 if (a_midlen < 0)
680 a_midlen = 0;
681 if (b_midlen < 0)
682 b_midlen = 0;
683
684 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
685 if (pfx_length + sfx_length) {
686 strbuf_add(&name, a, pfx_length);
687 strbuf_addch(&name, '{');
688 }
689 strbuf_add(&name, a + pfx_length, a_midlen);
690 strbuf_addstr(&name, " => ");
691 strbuf_add(&name, b + pfx_length, b_midlen);
692 if (pfx_length + sfx_length) {
693 strbuf_addch(&name, '}');
694 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
695 }
696 return strbuf_detach(&name, NULL);
697 }
698
699 struct diffstat_t {
700 struct xdiff_emit_state xm;
701
702 int nr;
703 int alloc;
704 struct diffstat_file {
705 char *from_name;
706 char *name;
707 char *print_name;
708 unsigned is_unmerged:1;
709 unsigned is_binary:1;
710 unsigned is_renamed:1;
711 unsigned int added, deleted;
712 } **files;
713 };
714
715 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
716 const char *name_a,
717 const char *name_b)
718 {
719 struct diffstat_file *x;
720 x = xcalloc(sizeof (*x), 1);
721 if (diffstat->nr == diffstat->alloc) {
722 diffstat->alloc = alloc_nr(diffstat->alloc);
723 diffstat->files = xrealloc(diffstat->files,
724 diffstat->alloc * sizeof(x));
725 }
726 diffstat->files[diffstat->nr++] = x;
727 if (name_b) {
728 x->from_name = xstrdup(name_a);
729 x->name = xstrdup(name_b);
730 x->is_renamed = 1;
731 }
732 else {
733 x->from_name = NULL;
734 x->name = xstrdup(name_a);
735 }
736 return x;
737 }
738
739 static void diffstat_consume(void *priv, char *line, unsigned long len)
740 {
741 struct diffstat_t *diffstat = priv;
742 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
743
744 if (line[0] == '+')
745 x->added++;
746 else if (line[0] == '-')
747 x->deleted++;
748 }
749
750 const char mime_boundary_leader[] = "------------";
751
752 static int scale_linear(int it, int width, int max_change)
753 {
754 /*
755 * make sure that at least one '-' is printed if there were deletions,
756 * and likewise for '+'.
757 */
758 if (max_change < 2)
759 return it;
760 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
761 }
762
763 static void show_name(const char *prefix, const char *name, int len,
764 const char *reset, const char *set)
765 {
766 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
767 }
768
769 static void show_graph(char ch, int cnt, const char *set, const char *reset)
770 {
771 if (cnt <= 0)
772 return;
773 printf("%s", set);
774 while (cnt--)
775 putchar(ch);
776 printf("%s", reset);
777 }
778
779 static void fill_print_name(struct diffstat_file *file)
780 {
781 char *pname;
782
783 if (file->print_name)
784 return;
785
786 if (!file->is_renamed) {
787 struct strbuf buf;
788 strbuf_init(&buf, 0);
789 if (quote_c_style(file->name, &buf, NULL, 0)) {
790 pname = strbuf_detach(&buf, NULL);
791 } else {
792 pname = file->name;
793 strbuf_release(&buf);
794 }
795 } else {
796 pname = pprint_rename(file->from_name, file->name);
797 }
798 file->print_name = pname;
799 }
800
801 static void show_stats(struct diffstat_t* data, struct diff_options *options)
802 {
803 int i, len, add, del, total, adds = 0, dels = 0;
804 int max_change = 0, max_len = 0;
805 int total_files = data->nr;
806 int width, name_width;
807 const char *reset, *set, *add_c, *del_c;
808
809 if (data->nr == 0)
810 return;
811
812 width = options->stat_width ? options->stat_width : 80;
813 name_width = options->stat_name_width ? options->stat_name_width : 50;
814
815 /* Sanity: give at least 5 columns to the graph,
816 * but leave at least 10 columns for the name.
817 */
818 if (width < name_width + 15) {
819 if (name_width <= 25)
820 width = name_width + 15;
821 else
822 name_width = width - 15;
823 }
824
825 /* Find the longest filename and max number of changes */
826 reset = diff_get_color_opt(options, DIFF_RESET);
827 set = diff_get_color_opt(options, DIFF_PLAIN);
828 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
829 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
830
831 for (i = 0; i < data->nr; i++) {
832 struct diffstat_file *file = data->files[i];
833 int change = file->added + file->deleted;
834 fill_print_name(file);
835 len = strlen(file->print_name);
836 if (max_len < len)
837 max_len = len;
838
839 if (file->is_binary || file->is_unmerged)
840 continue;
841 if (max_change < change)
842 max_change = change;
843 }
844
845 /* Compute the width of the graph part;
846 * 10 is for one blank at the beginning of the line plus
847 * " | count " between the name and the graph.
848 *
849 * From here on, name_width is the width of the name area,
850 * and width is the width of the graph area.
851 */
852 name_width = (name_width < max_len) ? name_width : max_len;
853 if (width < (name_width + 10) + max_change)
854 width = width - (name_width + 10);
855 else
856 width = max_change;
857
858 for (i = 0; i < data->nr; i++) {
859 const char *prefix = "";
860 char *name = data->files[i]->print_name;
861 int added = data->files[i]->added;
862 int deleted = data->files[i]->deleted;
863 int name_len;
864
865 /*
866 * "scale" the filename
867 */
868 len = name_width;
869 name_len = strlen(name);
870 if (name_width < name_len) {
871 char *slash;
872 prefix = "...";
873 len -= 3;
874 name += name_len - len;
875 slash = strchr(name, '/');
876 if (slash)
877 name = slash;
878 }
879
880 if (data->files[i]->is_binary) {
881 show_name(prefix, name, len, reset, set);
882 printf(" Bin ");
883 printf("%s%d%s", del_c, deleted, reset);
884 printf(" -> ");
885 printf("%s%d%s", add_c, added, reset);
886 printf(" bytes");
887 printf("\n");
888 continue;
889 }
890 else if (data->files[i]->is_unmerged) {
891 show_name(prefix, name, len, reset, set);
892 printf(" Unmerged\n");
893 continue;
894 }
895 else if (!data->files[i]->is_renamed &&
896 (added + deleted == 0)) {
897 total_files--;
898 continue;
899 }
900
901 /*
902 * scale the add/delete
903 */
904 add = added;
905 del = deleted;
906 total = add + del;
907 adds += add;
908 dels += del;
909
910 if (width <= max_change) {
911 add = scale_linear(add, width, max_change);
912 del = scale_linear(del, width, max_change);
913 total = add + del;
914 }
915 show_name(prefix, name, len, reset, set);
916 printf("%5d ", added + deleted);
917 show_graph('+', add, add_c, reset);
918 show_graph('-', del, del_c, reset);
919 putchar('\n');
920 }
921 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
922 set, total_files, adds, dels, reset);
923 }
924
925 static void show_shortstats(struct diffstat_t* data)
926 {
927 int i, adds = 0, dels = 0, total_files = data->nr;
928
929 if (data->nr == 0)
930 return;
931
932 for (i = 0; i < data->nr; i++) {
933 if (!data->files[i]->is_binary &&
934 !data->files[i]->is_unmerged) {
935 int added = data->files[i]->added;
936 int deleted= data->files[i]->deleted;
937 if (!data->files[i]->is_renamed &&
938 (added + deleted == 0)) {
939 total_files--;
940 } else {
941 adds += added;
942 dels += deleted;
943 }
944 }
945 }
946 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
947 total_files, adds, dels);
948 }
949
950 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
951 {
952 int i;
953
954 if (data->nr == 0)
955 return;
956
957 for (i = 0; i < data->nr; i++) {
958 struct diffstat_file *file = data->files[i];
959
960 if (file->is_binary)
961 printf("-\t-\t");
962 else
963 printf("%d\t%d\t", file->added, file->deleted);
964 if (options->line_termination) {
965 fill_print_name(file);
966 if (!file->is_renamed)
967 write_name_quoted(file->name, stdout,
968 options->line_termination);
969 else {
970 fputs(file->print_name, stdout);
971 putchar(options->line_termination);
972 }
973 } else {
974 if (file->is_renamed) {
975 putchar('\0');
976 write_name_quoted(file->from_name, stdout, '\0');
977 }
978 write_name_quoted(file->name, stdout, '\0');
979 }
980 }
981 }
982
983 static void free_diffstat_info(struct diffstat_t *diffstat)
984 {
985 int i;
986 for (i = 0; i < diffstat->nr; i++) {
987 struct diffstat_file *f = diffstat->files[i];
988 if (f->name != f->print_name)
989 free(f->print_name);
990 free(f->name);
991 free(f->from_name);
992 free(f);
993 }
994 free(diffstat->files);
995 }
996
997 struct checkdiff_t {
998 struct xdiff_emit_state xm;
999 const char *filename;
1000 int lineno, color_diff;
1001 unsigned ws_rule;
1002 unsigned status;
1003 };
1004
1005 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1006 {
1007 struct checkdiff_t *data = priv;
1008 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1009 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1010 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
1011 char *err;
1012
1013 if (line[0] == '+') {
1014 data->status = check_and_emit_line(line + 1, len - 1,
1015 data->ws_rule, NULL, NULL, NULL, NULL);
1016 if (!data->status)
1017 return;
1018 err = whitespace_error_string(data->status);
1019 printf("%s:%d: %s.\n", data->filename, data->lineno, err);
1020 free(err);
1021 emit_line(set, reset, line, 1);
1022 (void)check_and_emit_line(line + 1, len - 1, data->ws_rule,
1023 stdout, set, reset, ws);
1024 data->lineno++;
1025 } else if (line[0] == ' ')
1026 data->lineno++;
1027 else if (line[0] == '@') {
1028 char *plus = strchr(line, '+');
1029 if (plus)
1030 data->lineno = strtol(plus, NULL, 10);
1031 else
1032 die("invalid diff");
1033 }
1034 }
1035
1036 static unsigned char *deflate_it(char *data,
1037 unsigned long size,
1038 unsigned long *result_size)
1039 {
1040 int bound;
1041 unsigned char *deflated;
1042 z_stream stream;
1043
1044 memset(&stream, 0, sizeof(stream));
1045 deflateInit(&stream, zlib_compression_level);
1046 bound = deflateBound(&stream, size);
1047 deflated = xmalloc(bound);
1048 stream.next_out = deflated;
1049 stream.avail_out = bound;
1050
1051 stream.next_in = (unsigned char *)data;
1052 stream.avail_in = size;
1053 while (deflate(&stream, Z_FINISH) == Z_OK)
1054 ; /* nothing */
1055 deflateEnd(&stream);
1056 *result_size = stream.total_out;
1057 return deflated;
1058 }
1059
1060 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1061 {
1062 void *cp;
1063 void *delta;
1064 void *deflated;
1065 void *data;
1066 unsigned long orig_size;
1067 unsigned long delta_size;
1068 unsigned long deflate_size;
1069 unsigned long data_size;
1070
1071 /* We could do deflated delta, or we could do just deflated two,
1072 * whichever is smaller.
1073 */
1074 delta = NULL;
1075 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1076 if (one->size && two->size) {
1077 delta = diff_delta(one->ptr, one->size,
1078 two->ptr, two->size,
1079 &delta_size, deflate_size);
1080 if (delta) {
1081 void *to_free = delta;
1082 orig_size = delta_size;
1083 delta = deflate_it(delta, delta_size, &delta_size);
1084 free(to_free);
1085 }
1086 }
1087
1088 if (delta && delta_size < deflate_size) {
1089 printf("delta %lu\n", orig_size);
1090 free(deflated);
1091 data = delta;
1092 data_size = delta_size;
1093 }
1094 else {
1095 printf("literal %lu\n", two->size);
1096 free(delta);
1097 data = deflated;
1098 data_size = deflate_size;
1099 }
1100
1101 /* emit data encoded in base85 */
1102 cp = data;
1103 while (data_size) {
1104 int bytes = (52 < data_size) ? 52 : data_size;
1105 char line[70];
1106 data_size -= bytes;
1107 if (bytes <= 26)
1108 line[0] = bytes + 'A' - 1;
1109 else
1110 line[0] = bytes - 26 + 'a' - 1;
1111 encode_85(line + 1, cp, bytes);
1112 cp = (char *) cp + bytes;
1113 puts(line);
1114 }
1115 printf("\n");
1116 free(data);
1117 }
1118
1119 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1120 {
1121 printf("GIT binary patch\n");
1122 emit_binary_diff_body(one, two);
1123 emit_binary_diff_body(two, one);
1124 }
1125
1126 static void setup_diff_attr_check(struct git_attr_check *check)
1127 {
1128 static struct git_attr *attr_diff;
1129
1130 if (!attr_diff) {
1131 attr_diff = git_attr("diff", 4);
1132 }
1133 check[0].attr = attr_diff;
1134 }
1135
1136 static void diff_filespec_check_attr(struct diff_filespec *one)
1137 {
1138 struct git_attr_check attr_diff_check;
1139 int check_from_data = 0;
1140
1141 if (one->checked_attr)
1142 return;
1143
1144 setup_diff_attr_check(&attr_diff_check);
1145 one->is_binary = 0;
1146 one->funcname_pattern_ident = NULL;
1147
1148 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1149 const char *value;
1150
1151 /* binaryness */
1152 value = attr_diff_check.value;
1153 if (ATTR_TRUE(value))
1154 ;
1155 else if (ATTR_FALSE(value))
1156 one->is_binary = 1;
1157 else
1158 check_from_data = 1;
1159
1160 /* funcname pattern ident */
1161 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1162 ;
1163 else
1164 one->funcname_pattern_ident = value;
1165 }
1166
1167 if (check_from_data) {
1168 if (!one->data && DIFF_FILE_VALID(one))
1169 diff_populate_filespec(one, 0);
1170
1171 if (one->data)
1172 one->is_binary = buffer_is_binary(one->data, one->size);
1173 }
1174 }
1175
1176 int diff_filespec_is_binary(struct diff_filespec *one)
1177 {
1178 diff_filespec_check_attr(one);
1179 return one->is_binary;
1180 }
1181
1182 static const char *funcname_pattern(const char *ident)
1183 {
1184 struct funcname_pattern *pp;
1185
1186 for (pp = funcname_pattern_list; pp; pp = pp->next)
1187 if (!strcmp(ident, pp->name))
1188 return pp->pattern;
1189 return NULL;
1190 }
1191
1192 static struct builtin_funcname_pattern {
1193 const char *name;
1194 const char *pattern;
1195 } builtin_funcname_pattern[] = {
1196 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1197 "new\\|return\\|switch\\|throw\\|while\\)\n"
1198 "^[ ]*\\(\\([ ]*"
1199 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1200 "[ ]*([^;]*$\\)" },
1201 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1202 };
1203
1204 static const char *diff_funcname_pattern(struct diff_filespec *one)
1205 {
1206 const char *ident, *pattern;
1207 int i;
1208
1209 diff_filespec_check_attr(one);
1210 ident = one->funcname_pattern_ident;
1211
1212 if (!ident)
1213 /*
1214 * If the config file has "funcname.default" defined, that
1215 * regexp is used; otherwise NULL is returned and xemit uses
1216 * the built-in default.
1217 */
1218 return funcname_pattern("default");
1219
1220 /* Look up custom "funcname.$ident" regexp from config. */
1221 pattern = funcname_pattern(ident);
1222 if (pattern)
1223 return pattern;
1224
1225 /*
1226 * And define built-in fallback patterns here. Note that
1227 * these can be overridden by the user's config settings.
1228 */
1229 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1230 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1231 return builtin_funcname_pattern[i].pattern;
1232
1233 return NULL;
1234 }
1235
1236 static void builtin_diff(const char *name_a,
1237 const char *name_b,
1238 struct diff_filespec *one,
1239 struct diff_filespec *two,
1240 const char *xfrm_msg,
1241 struct diff_options *o,
1242 int complete_rewrite)
1243 {
1244 mmfile_t mf1, mf2;
1245 const char *lbl[2];
1246 char *a_one, *b_two;
1247 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1248 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1249
1250 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1251 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
1252 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1253 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1254 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1255 if (lbl[0][0] == '/') {
1256 /* /dev/null */
1257 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1258 if (xfrm_msg && xfrm_msg[0])
1259 printf("%s%s%s\n", set, xfrm_msg, reset);
1260 }
1261 else if (lbl[1][0] == '/') {
1262 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1263 if (xfrm_msg && xfrm_msg[0])
1264 printf("%s%s%s\n", set, xfrm_msg, reset);
1265 }
1266 else {
1267 if (one->mode != two->mode) {
1268 printf("%sold mode %06o%s\n", set, one->mode, reset);
1269 printf("%snew mode %06o%s\n", set, two->mode, reset);
1270 }
1271 if (xfrm_msg && xfrm_msg[0])
1272 printf("%s%s%s\n", set, xfrm_msg, reset);
1273 /*
1274 * we do not run diff between different kind
1275 * of objects.
1276 */
1277 if ((one->mode ^ two->mode) & S_IFMT)
1278 goto free_ab_and_return;
1279 if (complete_rewrite) {
1280 emit_rewrite_diff(name_a, name_b, one, two, o);
1281 o->found_changes = 1;
1282 goto free_ab_and_return;
1283 }
1284 }
1285
1286 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1287 die("unable to read files to diff");
1288
1289 if (!DIFF_OPT_TST(o, TEXT) &&
1290 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1291 /* Quite common confusing case */
1292 if (mf1.size == mf2.size &&
1293 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1294 goto free_ab_and_return;
1295 if (DIFF_OPT_TST(o, BINARY))
1296 emit_binary_diff(&mf1, &mf2);
1297 else
1298 printf("Binary files %s and %s differ\n",
1299 lbl[0], lbl[1]);
1300 o->found_changes = 1;
1301 }
1302 else {
1303 /* Crazy xdl interfaces.. */
1304 const char *diffopts = getenv("GIT_DIFF_OPTS");
1305 xpparam_t xpp;
1306 xdemitconf_t xecfg;
1307 xdemitcb_t ecb;
1308 struct emit_callback ecbdata;
1309 const char *funcname_pattern;
1310
1311 funcname_pattern = diff_funcname_pattern(one);
1312 if (!funcname_pattern)
1313 funcname_pattern = diff_funcname_pattern(two);
1314
1315 memset(&xecfg, 0, sizeof(xecfg));
1316 memset(&ecbdata, 0, sizeof(ecbdata));
1317 ecbdata.label_path = lbl;
1318 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1319 ecbdata.found_changesp = &o->found_changes;
1320 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1321 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1322 xecfg.ctxlen = o->context;
1323 xecfg.flags = XDL_EMIT_FUNCNAMES;
1324 if (funcname_pattern)
1325 xdiff_set_find_func(&xecfg, funcname_pattern);
1326 if (!diffopts)
1327 ;
1328 else if (!prefixcmp(diffopts, "--unified="))
1329 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1330 else if (!prefixcmp(diffopts, "-u"))
1331 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1332 ecb.outf = xdiff_outf;
1333 ecb.priv = &ecbdata;
1334 ecbdata.xm.consume = fn_out_consume;
1335 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1336 ecbdata.diff_words =
1337 xcalloc(1, sizeof(struct diff_words_data));
1338 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1339 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1340 free_diff_words_data(&ecbdata);
1341 }
1342
1343 free_ab_and_return:
1344 diff_free_filespec_data(one);
1345 diff_free_filespec_data(two);
1346 free(a_one);
1347 free(b_two);
1348 return;
1349 }
1350
1351 static void builtin_diffstat(const char *name_a, const char *name_b,
1352 struct diff_filespec *one,
1353 struct diff_filespec *two,
1354 struct diffstat_t *diffstat,
1355 struct diff_options *o,
1356 int complete_rewrite)
1357 {
1358 mmfile_t mf1, mf2;
1359 struct diffstat_file *data;
1360
1361 data = diffstat_add(diffstat, name_a, name_b);
1362
1363 if (!one || !two) {
1364 data->is_unmerged = 1;
1365 return;
1366 }
1367 if (complete_rewrite) {
1368 diff_populate_filespec(one, 0);
1369 diff_populate_filespec(two, 0);
1370 data->deleted = count_lines(one->data, one->size);
1371 data->added = count_lines(two->data, two->size);
1372 goto free_and_return;
1373 }
1374 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1375 die("unable to read files to diff");
1376
1377 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1378 data->is_binary = 1;
1379 data->added = mf2.size;
1380 data->deleted = mf1.size;
1381 } else {
1382 /* Crazy xdl interfaces.. */
1383 xpparam_t xpp;
1384 xdemitconf_t xecfg;
1385 xdemitcb_t ecb;
1386
1387 memset(&xecfg, 0, sizeof(xecfg));
1388 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1389 ecb.outf = xdiff_outf;
1390 ecb.priv = diffstat;
1391 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1392 }
1393
1394 free_and_return:
1395 diff_free_filespec_data(one);
1396 diff_free_filespec_data(two);
1397 }
1398
1399 static void builtin_checkdiff(const char *name_a, const char *name_b,
1400 struct diff_filespec *one,
1401 struct diff_filespec *two, struct diff_options *o)
1402 {
1403 mmfile_t mf1, mf2;
1404 struct checkdiff_t data;
1405
1406 if (!two)
1407 return;
1408
1409 memset(&data, 0, sizeof(data));
1410 data.xm.consume = checkdiff_consume;
1411 data.filename = name_b ? name_b : name_a;
1412 data.lineno = 0;
1413 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1414 data.ws_rule = whitespace_rule(data.filename);
1415
1416 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1417 die("unable to read files to diff");
1418
1419 if (diff_filespec_is_binary(two))
1420 goto free_and_return;
1421 else {
1422 /* Crazy xdl interfaces.. */
1423 xpparam_t xpp;
1424 xdemitconf_t xecfg;
1425 xdemitcb_t ecb;
1426
1427 memset(&xecfg, 0, sizeof(xecfg));
1428 xpp.flags = XDF_NEED_MINIMAL;
1429 ecb.outf = xdiff_outf;
1430 ecb.priv = &data;
1431 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1432 }
1433 free_and_return:
1434 diff_free_filespec_data(one);
1435 diff_free_filespec_data(two);
1436 if (data.status)
1437 DIFF_OPT_SET(o, CHECK_FAILED);
1438 }
1439
1440 struct diff_filespec *alloc_filespec(const char *path)
1441 {
1442 int namelen = strlen(path);
1443 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1444
1445 memset(spec, 0, sizeof(*spec));
1446 spec->path = (char *)(spec + 1);
1447 memcpy(spec->path, path, namelen+1);
1448 spec->count = 1;
1449 return spec;
1450 }
1451
1452 void free_filespec(struct diff_filespec *spec)
1453 {
1454 if (!--spec->count) {
1455 diff_free_filespec_data(spec);
1456 free(spec);
1457 }
1458 }
1459
1460 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1461 unsigned short mode)
1462 {
1463 if (mode) {
1464 spec->mode = canon_mode(mode);
1465 hashcpy(spec->sha1, sha1);
1466 spec->sha1_valid = !is_null_sha1(sha1);
1467 }
1468 }
1469
1470 /*
1471 * Given a name and sha1 pair, if the index tells us the file in
1472 * the work tree has that object contents, return true, so that
1473 * prepare_temp_file() does not have to inflate and extract.
1474 */
1475 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1476 {
1477 struct cache_entry *ce;
1478 struct stat st;
1479 int pos, len;
1480
1481 /* We do not read the cache ourselves here, because the
1482 * benchmark with my previous version that always reads cache
1483 * shows that it makes things worse for diff-tree comparing
1484 * two linux-2.6 kernel trees in an already checked out work
1485 * tree. This is because most diff-tree comparisons deal with
1486 * only a small number of files, while reading the cache is
1487 * expensive for a large project, and its cost outweighs the
1488 * savings we get by not inflating the object to a temporary
1489 * file. Practically, this code only helps when we are used
1490 * by diff-cache --cached, which does read the cache before
1491 * calling us.
1492 */
1493 if (!active_cache)
1494 return 0;
1495
1496 /* We want to avoid the working directory if our caller
1497 * doesn't need the data in a normal file, this system
1498 * is rather slow with its stat/open/mmap/close syscalls,
1499 * and the object is contained in a pack file. The pack
1500 * is probably already open and will be faster to obtain
1501 * the data through than the working directory. Loose
1502 * objects however would tend to be slower as they need
1503 * to be individually opened and inflated.
1504 */
1505 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1506 return 0;
1507
1508 len = strlen(name);
1509 pos = cache_name_pos(name, len);
1510 if (pos < 0)
1511 return 0;
1512 ce = active_cache[pos];
1513 if ((lstat(name, &st) < 0) ||
1514 !S_ISREG(st.st_mode) || /* careful! */
1515 ce_match_stat(ce, &st, 0) ||
1516 hashcmp(sha1, ce->sha1))
1517 return 0;
1518 /* we return 1 only when we can stat, it is a regular file,
1519 * stat information matches, and sha1 recorded in the cache
1520 * matches. I.e. we know the file in the work tree really is
1521 * the same as the <name, sha1> pair.
1522 */
1523 return 1;
1524 }
1525
1526 static int populate_from_stdin(struct diff_filespec *s)
1527 {
1528 struct strbuf buf;
1529 size_t size = 0;
1530
1531 strbuf_init(&buf, 0);
1532 if (strbuf_read(&buf, 0, 0) < 0)
1533 return error("error while reading from stdin %s",
1534 strerror(errno));
1535
1536 s->should_munmap = 0;
1537 s->data = strbuf_detach(&buf, &size);
1538 s->size = size;
1539 s->should_free = 1;
1540 return 0;
1541 }
1542
1543 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1544 {
1545 int len;
1546 char *data = xmalloc(100);
1547 len = snprintf(data, 100,
1548 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1549 s->data = data;
1550 s->size = len;
1551 s->should_free = 1;
1552 if (size_only) {
1553 s->data = NULL;
1554 free(data);
1555 }
1556 return 0;
1557 }
1558
1559 /*
1560 * While doing rename detection and pickaxe operation, we may need to
1561 * grab the data for the blob (or file) for our own in-core comparison.
1562 * diff_filespec has data and size fields for this purpose.
1563 */
1564 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1565 {
1566 int err = 0;
1567 if (!DIFF_FILE_VALID(s))
1568 die("internal error: asking to populate invalid file.");
1569 if (S_ISDIR(s->mode))
1570 return -1;
1571
1572 if (s->data)
1573 return 0;
1574
1575 if (size_only && 0 < s->size)
1576 return 0;
1577
1578 if (S_ISGITLINK(s->mode))
1579 return diff_populate_gitlink(s, size_only);
1580
1581 if (!s->sha1_valid ||
1582 reuse_worktree_file(s->path, s->sha1, 0)) {
1583 struct strbuf buf;
1584 struct stat st;
1585 int fd;
1586
1587 if (!strcmp(s->path, "-"))
1588 return populate_from_stdin(s);
1589
1590 if (lstat(s->path, &st) < 0) {
1591 if (errno == ENOENT) {
1592 err_empty:
1593 err = -1;
1594 empty:
1595 s->data = (char *)"";
1596 s->size = 0;
1597 return err;
1598 }
1599 }
1600 s->size = xsize_t(st.st_size);
1601 if (!s->size)
1602 goto empty;
1603 if (size_only)
1604 return 0;
1605 if (S_ISLNK(st.st_mode)) {
1606 int ret;
1607 s->data = xmalloc(s->size);
1608 s->should_free = 1;
1609 ret = readlink(s->path, s->data, s->size);
1610 if (ret < 0) {
1611 free(s->data);
1612 goto err_empty;
1613 }
1614 return 0;
1615 }
1616 fd = open(s->path, O_RDONLY);
1617 if (fd < 0)
1618 goto err_empty;
1619 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1620 close(fd);
1621 s->should_munmap = 1;
1622
1623 /*
1624 * Convert from working tree format to canonical git format
1625 */
1626 strbuf_init(&buf, 0);
1627 if (convert_to_git(s->path, s->data, s->size, &buf)) {
1628 size_t size = 0;
1629 munmap(s->data, s->size);
1630 s->should_munmap = 0;
1631 s->data = strbuf_detach(&buf, &size);
1632 s->size = size;
1633 s->should_free = 1;
1634 }
1635 }
1636 else {
1637 enum object_type type;
1638 if (size_only)
1639 type = sha1_object_info(s->sha1, &s->size);
1640 else {
1641 s->data = read_sha1_file(s->sha1, &type, &s->size);
1642 s->should_free = 1;
1643 }
1644 }
1645 return 0;
1646 }
1647
1648 void diff_free_filespec_blob(struct diff_filespec *s)
1649 {
1650 if (s->should_free)
1651 free(s->data);
1652 else if (s->should_munmap)
1653 munmap(s->data, s->size);
1654
1655 if (s->should_free || s->should_munmap) {
1656 s->should_free = s->should_munmap = 0;
1657 s->data = NULL;
1658 }
1659 }
1660
1661 void diff_free_filespec_data(struct diff_filespec *s)
1662 {
1663 diff_free_filespec_blob(s);
1664 free(s->cnt_data);
1665 s->cnt_data = NULL;
1666 }
1667
1668 static void prep_temp_blob(struct diff_tempfile *temp,
1669 void *blob,
1670 unsigned long size,
1671 const unsigned char *sha1,
1672 int mode)
1673 {
1674 int fd;
1675
1676 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1677 if (fd < 0)
1678 die("unable to create temp-file: %s", strerror(errno));
1679 if (write_in_full(fd, blob, size) != size)
1680 die("unable to write temp-file");
1681 close(fd);
1682 temp->name = temp->tmp_path;
1683 strcpy(temp->hex, sha1_to_hex(sha1));
1684 temp->hex[40] = 0;
1685 sprintf(temp->mode, "%06o", mode);
1686 }
1687
1688 static void prepare_temp_file(const char *name,
1689 struct diff_tempfile *temp,
1690 struct diff_filespec *one)
1691 {
1692 if (!DIFF_FILE_VALID(one)) {
1693 not_a_valid_file:
1694 /* A '-' entry produces this for file-2, and
1695 * a '+' entry produces this for file-1.
1696 */
1697 temp->name = "/dev/null";
1698 strcpy(temp->hex, ".");
1699 strcpy(temp->mode, ".");
1700 return;
1701 }
1702
1703 if (!one->sha1_valid ||
1704 reuse_worktree_file(name, one->sha1, 1)) {
1705 struct stat st;
1706 if (lstat(name, &st) < 0) {
1707 if (errno == ENOENT)
1708 goto not_a_valid_file;
1709 die("stat(%s): %s", name, strerror(errno));
1710 }
1711 if (S_ISLNK(st.st_mode)) {
1712 int ret;
1713 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1714 size_t sz = xsize_t(st.st_size);
1715 if (sizeof(buf) <= st.st_size)
1716 die("symlink too long: %s", name);
1717 ret = readlink(name, buf, sz);
1718 if (ret < 0)
1719 die("readlink(%s)", name);
1720 prep_temp_blob(temp, buf, sz,
1721 (one->sha1_valid ?
1722 one->sha1 : null_sha1),
1723 (one->sha1_valid ?
1724 one->mode : S_IFLNK));
1725 }
1726 else {
1727 /* we can borrow from the file in the work tree */
1728 temp->name = name;
1729 if (!one->sha1_valid)
1730 strcpy(temp->hex, sha1_to_hex(null_sha1));
1731 else
1732 strcpy(temp->hex, sha1_to_hex(one->sha1));
1733 /* Even though we may sometimes borrow the
1734 * contents from the work tree, we always want
1735 * one->mode. mode is trustworthy even when
1736 * !(one->sha1_valid), as long as
1737 * DIFF_FILE_VALID(one).
1738 */
1739 sprintf(temp->mode, "%06o", one->mode);
1740 }
1741 return;
1742 }
1743 else {
1744 if (diff_populate_filespec(one, 0))
1745 die("cannot read data blob for %s", one->path);
1746 prep_temp_blob(temp, one->data, one->size,
1747 one->sha1, one->mode);
1748 }
1749 }
1750
1751 static void remove_tempfile(void)
1752 {
1753 int i;
1754
1755 for (i = 0; i < 2; i++)
1756 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1757 unlink(diff_temp[i].name);
1758 diff_temp[i].name = NULL;
1759 }
1760 }
1761
1762 static void remove_tempfile_on_signal(int signo)
1763 {
1764 remove_tempfile();
1765 signal(SIGINT, SIG_DFL);
1766 raise(signo);
1767 }
1768
1769 /* An external diff command takes:
1770 *
1771 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1772 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1773 *
1774 */
1775 static void run_external_diff(const char *pgm,
1776 const char *name,
1777 const char *other,
1778 struct diff_filespec *one,
1779 struct diff_filespec *two,
1780 const char *xfrm_msg,
1781 int complete_rewrite)
1782 {
1783 const char *spawn_arg[10];
1784 struct diff_tempfile *temp = diff_temp;
1785 int retval;
1786 static int atexit_asked = 0;
1787 const char *othername;
1788 const char **arg = &spawn_arg[0];
1789
1790 othername = (other? other : name);
1791 if (one && two) {
1792 prepare_temp_file(name, &temp[0], one);
1793 prepare_temp_file(othername, &temp[1], two);
1794 if (! atexit_asked &&
1795 (temp[0].name == temp[0].tmp_path ||
1796 temp[1].name == temp[1].tmp_path)) {
1797 atexit_asked = 1;
1798 atexit(remove_tempfile);
1799 }
1800 signal(SIGINT, remove_tempfile_on_signal);
1801 }
1802
1803 if (one && two) {
1804 *arg++ = pgm;
1805 *arg++ = name;
1806 *arg++ = temp[0].name;
1807 *arg++ = temp[0].hex;
1808 *arg++ = temp[0].mode;
1809 *arg++ = temp[1].name;
1810 *arg++ = temp[1].hex;
1811 *arg++ = temp[1].mode;
1812 if (other) {
1813 *arg++ = other;
1814 *arg++ = xfrm_msg;
1815 }
1816 } else {
1817 *arg++ = pgm;
1818 *arg++ = name;
1819 }
1820 *arg = NULL;
1821 fflush(NULL);
1822 retval = run_command_v_opt(spawn_arg, 0);
1823 remove_tempfile();
1824 if (retval) {
1825 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1826 exit(1);
1827 }
1828 }
1829
1830 static const char *external_diff_attr(const char *name)
1831 {
1832 struct git_attr_check attr_diff_check;
1833
1834 setup_diff_attr_check(&attr_diff_check);
1835 if (!git_checkattr(name, 1, &attr_diff_check)) {
1836 const char *value = attr_diff_check.value;
1837 if (!ATTR_TRUE(value) &&
1838 !ATTR_FALSE(value) &&
1839 !ATTR_UNSET(value)) {
1840 struct ll_diff_driver *drv;
1841
1842 for (drv = user_diff; drv; drv = drv->next)
1843 if (!strcmp(drv->name, value))
1844 return drv->cmd;
1845 }
1846 }
1847 return NULL;
1848 }
1849
1850 static void run_diff_cmd(const char *pgm,
1851 const char *name,
1852 const char *other,
1853 struct diff_filespec *one,
1854 struct diff_filespec *two,
1855 const char *xfrm_msg,
1856 struct diff_options *o,
1857 int complete_rewrite)
1858 {
1859 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
1860 pgm = NULL;
1861 else {
1862 const char *cmd = external_diff_attr(name);
1863 if (cmd)
1864 pgm = cmd;
1865 }
1866
1867 if (pgm) {
1868 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1869 complete_rewrite);
1870 return;
1871 }
1872 if (one && two)
1873 builtin_diff(name, other ? other : name,
1874 one, two, xfrm_msg, o, complete_rewrite);
1875 else
1876 printf("* Unmerged path %s\n", name);
1877 }
1878
1879 static void diff_fill_sha1_info(struct diff_filespec *one)
1880 {
1881 if (DIFF_FILE_VALID(one)) {
1882 if (!one->sha1_valid) {
1883 struct stat st;
1884 if (!strcmp(one->path, "-")) {
1885 hashcpy(one->sha1, null_sha1);
1886 return;
1887 }
1888 if (lstat(one->path, &st) < 0)
1889 die("stat %s", one->path);
1890 if (index_path(one->sha1, one->path, &st, 0))
1891 die("cannot hash %s\n", one->path);
1892 }
1893 }
1894 else
1895 hashclr(one->sha1);
1896 }
1897
1898 static int similarity_index(struct diff_filepair *p)
1899 {
1900 return p->score * 100 / MAX_SCORE;
1901 }
1902
1903 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1904 {
1905 const char *pgm = external_diff();
1906 struct strbuf msg;
1907 char *xfrm_msg;
1908 struct diff_filespec *one = p->one;
1909 struct diff_filespec *two = p->two;
1910 const char *name;
1911 const char *other;
1912 int complete_rewrite = 0;
1913
1914
1915 if (DIFF_PAIR_UNMERGED(p)) {
1916 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1917 return;
1918 }
1919
1920 name = p->one->path;
1921 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1922 diff_fill_sha1_info(one);
1923 diff_fill_sha1_info(two);
1924
1925 strbuf_init(&msg, PATH_MAX * 2 + 300);
1926 switch (p->status) {
1927 case DIFF_STATUS_COPIED:
1928 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1929 strbuf_addstr(&msg, "\ncopy from ");
1930 quote_c_style(name, &msg, NULL, 0);
1931 strbuf_addstr(&msg, "\ncopy to ");
1932 quote_c_style(other, &msg, NULL, 0);
1933 strbuf_addch(&msg, '\n');
1934 break;
1935 case DIFF_STATUS_RENAMED:
1936 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1937 strbuf_addstr(&msg, "\nrename from ");
1938 quote_c_style(name, &msg, NULL, 0);
1939 strbuf_addstr(&msg, "\nrename to ");
1940 quote_c_style(other, &msg, NULL, 0);
1941 strbuf_addch(&msg, '\n');
1942 break;
1943 case DIFF_STATUS_MODIFIED:
1944 if (p->score) {
1945 strbuf_addf(&msg, "dissimilarity index %d%%\n",
1946 similarity_index(p));
1947 complete_rewrite = 1;
1948 break;
1949 }
1950 /* fallthru */
1951 default:
1952 /* nothing */
1953 ;
1954 }
1955
1956 if (hashcmp(one->sha1, two->sha1)) {
1957 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
1958
1959 if (DIFF_OPT_TST(o, BINARY)) {
1960 mmfile_t mf;
1961 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
1962 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
1963 abbrev = 40;
1964 }
1965 strbuf_addf(&msg, "index %.*s..%.*s",
1966 abbrev, sha1_to_hex(one->sha1),
1967 abbrev, sha1_to_hex(two->sha1));
1968 if (one->mode == two->mode)
1969 strbuf_addf(&msg, " %06o", one->mode);
1970 strbuf_addch(&msg, '\n');
1971 }
1972
1973 if (msg.len)
1974 strbuf_setlen(&msg, msg.len - 1);
1975 xfrm_msg = msg.len ? msg.buf : NULL;
1976
1977 if (!pgm &&
1978 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1979 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1980 /* a filepair that changes between file and symlink
1981 * needs to be split into deletion and creation.
1982 */
1983 struct diff_filespec *null = alloc_filespec(two->path);
1984 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1985 free(null);
1986 null = alloc_filespec(one->path);
1987 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1988 free(null);
1989 }
1990 else
1991 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1992 complete_rewrite);
1993
1994 strbuf_release(&msg);
1995 }
1996
1997 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1998 struct diffstat_t *diffstat)
1999 {
2000 const char *name;
2001 const char *other;
2002 int complete_rewrite = 0;
2003
2004 if (DIFF_PAIR_UNMERGED(p)) {
2005 /* unmerged */
2006 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2007 return;
2008 }
2009
2010 name = p->one->path;
2011 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2012
2013 diff_fill_sha1_info(p->one);
2014 diff_fill_sha1_info(p->two);
2015
2016 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2017 complete_rewrite = 1;
2018 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2019 }
2020
2021 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2022 {
2023 const char *name;
2024 const char *other;
2025
2026 if (DIFF_PAIR_UNMERGED(p)) {
2027 /* unmerged */
2028 return;
2029 }
2030
2031 name = p->one->path;
2032 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2033
2034 diff_fill_sha1_info(p->one);
2035 diff_fill_sha1_info(p->two);
2036
2037 builtin_checkdiff(name, other, p->one, p->two, o);
2038 }
2039
2040 void diff_setup(struct diff_options *options)
2041 {
2042 memset(options, 0, sizeof(*options));
2043 options->line_termination = '\n';
2044 options->break_opt = -1;
2045 options->rename_limit = -1;
2046 options->context = 3;
2047 options->msg_sep = "";
2048
2049 options->change = diff_change;
2050 options->add_remove = diff_addremove;
2051 if (diff_use_color_default)
2052 DIFF_OPT_SET(options, COLOR_DIFF);
2053 else
2054 DIFF_OPT_CLR(options, COLOR_DIFF);
2055 options->detect_rename = diff_detect_rename_default;
2056
2057 options->a_prefix = "a/";
2058 options->b_prefix = "b/";
2059 }
2060
2061 int diff_setup_done(struct diff_options *options)
2062 {
2063 int count = 0;
2064
2065 if (options->output_format & DIFF_FORMAT_NAME)
2066 count++;
2067 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2068 count++;
2069 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2070 count++;
2071 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2072 count++;
2073 if (count > 1)
2074 die("--name-only, --name-status, --check and -s are mutually exclusive");
2075
2076 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2077 options->detect_rename = DIFF_DETECT_COPY;
2078
2079 if (options->output_format & (DIFF_FORMAT_NAME |
2080 DIFF_FORMAT_NAME_STATUS |
2081 DIFF_FORMAT_CHECKDIFF |
2082 DIFF_FORMAT_NO_OUTPUT))
2083 options->output_format &= ~(DIFF_FORMAT_RAW |
2084 DIFF_FORMAT_NUMSTAT |
2085 DIFF_FORMAT_DIFFSTAT |
2086 DIFF_FORMAT_SHORTSTAT |
2087 DIFF_FORMAT_SUMMARY |
2088 DIFF_FORMAT_PATCH);
2089
2090 /*
2091 * These cases always need recursive; we do not drop caller-supplied
2092 * recursive bits for other formats here.
2093 */
2094 if (options->output_format & (DIFF_FORMAT_PATCH |
2095 DIFF_FORMAT_NUMSTAT |
2096 DIFF_FORMAT_DIFFSTAT |
2097 DIFF_FORMAT_SHORTSTAT |
2098 DIFF_FORMAT_SUMMARY |
2099 DIFF_FORMAT_CHECKDIFF))
2100 DIFF_OPT_SET(options, RECURSIVE);
2101 /*
2102 * Also pickaxe would not work very well if you do not say recursive
2103 */
2104 if (options->pickaxe)
2105 DIFF_OPT_SET(options, RECURSIVE);
2106
2107 if (options->detect_rename && options->rename_limit < 0)
2108 options->rename_limit = diff_rename_limit_default;
2109 if (options->setup & DIFF_SETUP_USE_CACHE) {
2110 if (!active_cache)
2111 /* read-cache does not die even when it fails
2112 * so it is safe for us to do this here. Also
2113 * it does not smudge active_cache or active_nr
2114 * when it fails, so we do not have to worry about
2115 * cleaning it up ourselves either.
2116 */
2117 read_cache();
2118 }
2119 if (options->abbrev <= 0 || 40 < options->abbrev)
2120 options->abbrev = 40; /* full */
2121
2122 /*
2123 * It does not make sense to show the first hit we happened
2124 * to have found. It does not make sense not to return with
2125 * exit code in such a case either.
2126 */
2127 if (DIFF_OPT_TST(options, QUIET)) {
2128 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2129 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2130 }
2131
2132 /*
2133 * If we postprocess in diffcore, we cannot simply return
2134 * upon the first hit. We need to run diff as usual.
2135 */
2136 if (options->pickaxe || options->filter)
2137 DIFF_OPT_CLR(options, QUIET);
2138
2139 return 0;
2140 }
2141
2142 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2143 {
2144 char c, *eq;
2145 int len;
2146
2147 if (*arg != '-')
2148 return 0;
2149 c = *++arg;
2150 if (!c)
2151 return 0;
2152 if (c == arg_short) {
2153 c = *++arg;
2154 if (!c)
2155 return 1;
2156 if (val && isdigit(c)) {
2157 char *end;
2158 int n = strtoul(arg, &end, 10);
2159 if (*end)
2160 return 0;
2161 *val = n;
2162 return 1;
2163 }
2164 return 0;
2165 }
2166 if (c != '-')
2167 return 0;
2168 arg++;
2169 eq = strchr(arg, '=');
2170 if (eq)
2171 len = eq - arg;
2172 else
2173 len = strlen(arg);
2174 if (!len || strncmp(arg, arg_long, len))
2175 return 0;
2176 if (eq) {
2177 int n;
2178 char *end;
2179 if (!isdigit(*++eq))
2180 return 0;
2181 n = strtoul(eq, &end, 10);
2182 if (*end)
2183 return 0;
2184 *val = n;
2185 }
2186 return 1;
2187 }
2188
2189 static int diff_scoreopt_parse(const char *opt);
2190
2191 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2192 {
2193 const char *arg = av[0];
2194
2195 /* Output format options */
2196 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2197 options->output_format |= DIFF_FORMAT_PATCH;
2198 else if (opt_arg(arg, 'U', "unified", &options->context))
2199 options->output_format |= DIFF_FORMAT_PATCH;
2200 else if (!strcmp(arg, "--raw"))
2201 options->output_format |= DIFF_FORMAT_RAW;
2202 else if (!strcmp(arg, "--patch-with-raw"))
2203 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2204 else if (!strcmp(arg, "--numstat"))
2205 options->output_format |= DIFF_FORMAT_NUMSTAT;
2206 else if (!strcmp(arg, "--shortstat"))
2207 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2208 else if (!strcmp(arg, "--check"))
2209 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2210 else if (!strcmp(arg, "--summary"))
2211 options->output_format |= DIFF_FORMAT_SUMMARY;
2212 else if (!strcmp(arg, "--patch-with-stat"))
2213 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2214 else if (!strcmp(arg, "--name-only"))
2215 options->output_format |= DIFF_FORMAT_NAME;
2216 else if (!strcmp(arg, "--name-status"))
2217 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2218 else if (!strcmp(arg, "-s"))
2219 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2220 else if (!prefixcmp(arg, "--stat")) {
2221 char *end;
2222 int width = options->stat_width;
2223 int name_width = options->stat_name_width;
2224 arg += 6;
2225 end = (char *)arg;
2226
2227 switch (*arg) {
2228 case '-':
2229 if (!prefixcmp(arg, "-width="))
2230 width = strtoul(arg + 7, &end, 10);
2231 else if (!prefixcmp(arg, "-name-width="))
2232 name_width = strtoul(arg + 12, &end, 10);
2233 break;
2234 case '=':
2235 width = strtoul(arg+1, &end, 10);
2236 if (*end == ',')
2237 name_width = strtoul(end+1, &end, 10);
2238 }
2239
2240 /* Important! This checks all the error cases! */
2241 if (*end)
2242 return 0;
2243 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2244 options->stat_name_width = name_width;
2245 options->stat_width = width;
2246 }
2247
2248 /* renames options */
2249 else if (!prefixcmp(arg, "-B")) {
2250 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2251 return -1;
2252 }
2253 else if (!prefixcmp(arg, "-M")) {
2254 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2255 return -1;
2256 options->detect_rename = DIFF_DETECT_RENAME;
2257 }
2258 else if (!prefixcmp(arg, "-C")) {
2259 if (options->detect_rename == DIFF_DETECT_COPY)
2260 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2261 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2262 return -1;
2263 options->detect_rename = DIFF_DETECT_COPY;
2264 }
2265 else if (!strcmp(arg, "--no-renames"))
2266 options->detect_rename = 0;
2267
2268 /* xdiff options */
2269 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2270 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2271 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2272 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2273 else if (!strcmp(arg, "--ignore-space-at-eol"))
2274 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2275
2276 /* flags options */
2277 else if (!strcmp(arg, "--binary")) {
2278 options->output_format |= DIFF_FORMAT_PATCH;
2279 DIFF_OPT_SET(options, BINARY);
2280 }
2281 else if (!strcmp(arg, "--full-index"))
2282 DIFF_OPT_SET(options, FULL_INDEX);
2283 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2284 DIFF_OPT_SET(options, TEXT);
2285 else if (!strcmp(arg, "-R"))
2286 DIFF_OPT_SET(options, REVERSE_DIFF);
2287 else if (!strcmp(arg, "--find-copies-harder"))
2288 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2289 else if (!strcmp(arg, "--follow"))
2290 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2291 else if (!strcmp(arg, "--color"))
2292 DIFF_OPT_SET(options, COLOR_DIFF);
2293 else if (!strcmp(arg, "--no-color"))
2294 DIFF_OPT_CLR(options, COLOR_DIFF);
2295 else if (!strcmp(arg, "--color-words"))
2296 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2297 else if (!strcmp(arg, "--exit-code"))
2298 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2299 else if (!strcmp(arg, "--quiet"))
2300 DIFF_OPT_SET(options, QUIET);
2301 else if (!strcmp(arg, "--ext-diff"))
2302 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2303 else if (!strcmp(arg, "--no-ext-diff"))
2304 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2305
2306 /* misc options */
2307 else if (!strcmp(arg, "-z"))
2308 options->line_termination = 0;
2309 else if (!prefixcmp(arg, "-l"))
2310 options->rename_limit = strtoul(arg+2, NULL, 10);
2311 else if (!prefixcmp(arg, "-S"))
2312 options->pickaxe = arg + 2;
2313 else if (!strcmp(arg, "--pickaxe-all"))
2314 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2315 else if (!strcmp(arg, "--pickaxe-regex"))
2316 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2317 else if (!prefixcmp(arg, "-O"))
2318 options->orderfile = arg + 2;
2319 else if (!prefixcmp(arg, "--diff-filter="))
2320 options->filter = arg + 14;
2321 else if (!strcmp(arg, "--abbrev"))
2322 options->abbrev = DEFAULT_ABBREV;
2323 else if (!prefixcmp(arg, "--abbrev=")) {
2324 options->abbrev = strtoul(arg + 9, NULL, 10);
2325 if (options->abbrev < MINIMUM_ABBREV)
2326 options->abbrev = MINIMUM_ABBREV;
2327 else if (40 < options->abbrev)
2328 options->abbrev = 40;
2329 }
2330 else if (!prefixcmp(arg, "--src-prefix="))
2331 options->a_prefix = arg + 13;
2332 else if (!prefixcmp(arg, "--dst-prefix="))
2333 options->b_prefix = arg + 13;
2334 else if (!strcmp(arg, "--no-prefix"))
2335 options->a_prefix = options->b_prefix = "";
2336 else
2337 return 0;
2338 return 1;
2339 }
2340
2341 static int parse_num(const char **cp_p)
2342 {
2343 unsigned long num, scale;
2344 int ch, dot;
2345 const char *cp = *cp_p;
2346
2347 num = 0;
2348 scale = 1;
2349 dot = 0;
2350 for(;;) {
2351 ch = *cp;
2352 if ( !dot && ch == '.' ) {
2353 scale = 1;
2354 dot = 1;
2355 } else if ( ch == '%' ) {
2356 scale = dot ? scale*100 : 100;
2357 cp++; /* % is always at the end */
2358 break;
2359 } else if ( ch >= '0' && ch <= '9' ) {
2360 if ( scale < 100000 ) {
2361 scale *= 10;
2362 num = (num*10) + (ch-'0');
2363 }
2364 } else {
2365 break;
2366 }
2367 cp++;
2368 }
2369 *cp_p = cp;
2370
2371 /* user says num divided by scale and we say internally that
2372 * is MAX_SCORE * num / scale.
2373 */
2374 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2375 }
2376
2377 static int diff_scoreopt_parse(const char *opt)
2378 {
2379 int opt1, opt2, cmd;
2380
2381 if (*opt++ != '-')
2382 return -1;
2383 cmd = *opt++;
2384 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2385 return -1; /* that is not a -M, -C nor -B option */
2386
2387 opt1 = parse_num(&opt);
2388 if (cmd != 'B')
2389 opt2 = 0;
2390 else {
2391 if (*opt == 0)
2392 opt2 = 0;
2393 else if (*opt != '/')
2394 return -1; /* we expect -B80/99 or -B80 */
2395 else {
2396 opt++;
2397 opt2 = parse_num(&opt);
2398 }
2399 }
2400 if (*opt != 0)
2401 return -1;
2402 return opt1 | (opt2 << 16);
2403 }
2404
2405 struct diff_queue_struct diff_queued_diff;
2406
2407 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2408 {
2409 if (queue->alloc <= queue->nr) {
2410 queue->alloc = alloc_nr(queue->alloc);
2411 queue->queue = xrealloc(queue->queue,
2412 sizeof(dp) * queue->alloc);
2413 }
2414 queue->queue[queue->nr++] = dp;
2415 }
2416
2417 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2418 struct diff_filespec *one,
2419 struct diff_filespec *two)
2420 {
2421 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2422 dp->one = one;
2423 dp->two = two;
2424 if (queue)
2425 diff_q(queue, dp);
2426 return dp;
2427 }
2428
2429 void diff_free_filepair(struct diff_filepair *p)
2430 {
2431 free_filespec(p->one);
2432 free_filespec(p->two);
2433 free(p);
2434 }
2435
2436 /* This is different from find_unique_abbrev() in that
2437 * it stuffs the result with dots for alignment.
2438 */
2439 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2440 {
2441 int abblen;
2442 const char *abbrev;
2443 if (len == 40)
2444 return sha1_to_hex(sha1);
2445
2446 abbrev = find_unique_abbrev(sha1, len);
2447 if (!abbrev)
2448 return sha1_to_hex(sha1);
2449 abblen = strlen(abbrev);
2450 if (abblen < 37) {
2451 static char hex[41];
2452 if (len < abblen && abblen <= len + 2)
2453 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2454 else
2455 sprintf(hex, "%s...", abbrev);
2456 return hex;
2457 }
2458 return sha1_to_hex(sha1);
2459 }
2460
2461 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2462 {
2463 int line_termination = opt->line_termination;
2464 int inter_name_termination = line_termination ? '\t' : '\0';
2465
2466 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2467 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2468 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2469 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2470 }
2471 if (p->score) {
2472 printf("%c%03d%c", p->status, similarity_index(p),
2473 inter_name_termination);
2474 } else {
2475 printf("%c%c", p->status, inter_name_termination);
2476 }
2477
2478 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2479 write_name_quoted(p->one->path, stdout, inter_name_termination);
2480 write_name_quoted(p->two->path, stdout, line_termination);
2481 } else {
2482 const char *path = p->one->mode ? p->one->path : p->two->path;
2483 write_name_quoted(path, stdout, line_termination);
2484 }
2485 }
2486
2487 int diff_unmodified_pair(struct diff_filepair *p)
2488 {
2489 /* This function is written stricter than necessary to support
2490 * the currently implemented transformers, but the idea is to
2491 * let transformers to produce diff_filepairs any way they want,
2492 * and filter and clean them up here before producing the output.
2493 */
2494 struct diff_filespec *one = p->one, *two = p->two;
2495
2496 if (DIFF_PAIR_UNMERGED(p))
2497 return 0; /* unmerged is interesting */
2498
2499 /* deletion, addition, mode or type change
2500 * and rename are all interesting.
2501 */
2502 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2503 DIFF_PAIR_MODE_CHANGED(p) ||
2504 strcmp(one->path, two->path))
2505 return 0;
2506
2507 /* both are valid and point at the same path. that is, we are
2508 * dealing with a change.
2509 */
2510 if (one->sha1_valid && two->sha1_valid &&
2511 !hashcmp(one->sha1, two->sha1))
2512 return 1; /* no change */
2513 if (!one->sha1_valid && !two->sha1_valid)
2514 return 1; /* both look at the same file on the filesystem. */
2515 return 0;
2516 }
2517
2518 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2519 {
2520 if (diff_unmodified_pair(p))
2521 return;
2522
2523 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2524 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2525 return; /* no tree diffs in patch format */
2526
2527 run_diff(p, o);
2528 }
2529
2530 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2531 struct diffstat_t *diffstat)
2532 {
2533 if (diff_unmodified_pair(p))
2534 return;
2535
2536 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2537 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2538 return; /* no tree diffs in patch format */
2539
2540 run_diffstat(p, o, diffstat);
2541 }
2542
2543 static void diff_flush_checkdiff(struct diff_filepair *p,
2544 struct diff_options *o)
2545 {
2546 if (diff_unmodified_pair(p))
2547 return;
2548
2549 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2550 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2551 return; /* no tree diffs in patch format */
2552
2553 run_checkdiff(p, o);
2554 }
2555
2556 int diff_queue_is_empty(void)
2557 {
2558 struct diff_queue_struct *q = &diff_queued_diff;
2559 int i;
2560 for (i = 0; i < q->nr; i++)
2561 if (!diff_unmodified_pair(q->queue[i]))
2562 return 0;
2563 return 1;
2564 }
2565
2566 #if DIFF_DEBUG
2567 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2568 {
2569 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2570 x, one ? one : "",
2571 s->path,
2572 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2573 s->mode,
2574 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2575 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2576 x, one ? one : "",
2577 s->size, s->xfrm_flags);
2578 }
2579
2580 void diff_debug_filepair(const struct diff_filepair *p, int i)
2581 {
2582 diff_debug_filespec(p->one, i, "one");
2583 diff_debug_filespec(p->two, i, "two");
2584 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2585 p->score, p->status ? p->status : '?',
2586 p->one->rename_used, p->broken_pair);
2587 }
2588
2589 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2590 {
2591 int i;
2592 if (msg)
2593 fprintf(stderr, "%s\n", msg);
2594 fprintf(stderr, "q->nr = %d\n", q->nr);
2595 for (i = 0; i < q->nr; i++) {
2596 struct diff_filepair *p = q->queue[i];
2597 diff_debug_filepair(p, i);
2598 }
2599 }
2600 #endif
2601
2602 static void diff_resolve_rename_copy(void)
2603 {
2604 int i;
2605 struct diff_filepair *p;
2606 struct diff_queue_struct *q = &diff_queued_diff;
2607
2608 diff_debug_queue("resolve-rename-copy", q);
2609
2610 for (i = 0; i < q->nr; i++) {
2611 p = q->queue[i];
2612 p->status = 0; /* undecided */
2613 if (DIFF_PAIR_UNMERGED(p))
2614 p->status = DIFF_STATUS_UNMERGED;
2615 else if (!DIFF_FILE_VALID(p->one))
2616 p->status = DIFF_STATUS_ADDED;
2617 else if (!DIFF_FILE_VALID(p->two))
2618 p->status = DIFF_STATUS_DELETED;
2619 else if (DIFF_PAIR_TYPE_CHANGED(p))
2620 p->status = DIFF_STATUS_TYPE_CHANGED;
2621
2622 /* from this point on, we are dealing with a pair
2623 * whose both sides are valid and of the same type, i.e.
2624 * either in-place edit or rename/copy edit.
2625 */
2626 else if (DIFF_PAIR_RENAME(p)) {
2627 /*
2628 * A rename might have re-connected a broken
2629 * pair up, causing the pathnames to be the
2630 * same again. If so, that's not a rename at
2631 * all, just a modification..
2632 *
2633 * Otherwise, see if this source was used for
2634 * multiple renames, in which case we decrement
2635 * the count, and call it a copy.
2636 */
2637 if (!strcmp(p->one->path, p->two->path))
2638 p->status = DIFF_STATUS_MODIFIED;
2639 else if (--p->one->rename_used > 0)
2640 p->status = DIFF_STATUS_COPIED;
2641 else
2642 p->status = DIFF_STATUS_RENAMED;
2643 }
2644 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2645 p->one->mode != p->two->mode ||
2646 is_null_sha1(p->one->sha1))
2647 p->status = DIFF_STATUS_MODIFIED;
2648 else {
2649 /* This is a "no-change" entry and should not
2650 * happen anymore, but prepare for broken callers.
2651 */
2652 error("feeding unmodified %s to diffcore",
2653 p->one->path);
2654 p->status = DIFF_STATUS_UNKNOWN;
2655 }
2656 }
2657 diff_debug_queue("resolve-rename-copy done", q);
2658 }
2659
2660 static int check_pair_status(struct diff_filepair *p)
2661 {
2662 switch (p->status) {
2663 case DIFF_STATUS_UNKNOWN:
2664 return 0;
2665 case 0:
2666 die("internal error in diff-resolve-rename-copy");
2667 default:
2668 return 1;
2669 }
2670 }
2671
2672 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2673 {
2674 int fmt = opt->output_format;
2675
2676 if (fmt & DIFF_FORMAT_CHECKDIFF)
2677 diff_flush_checkdiff(p, opt);
2678 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2679 diff_flush_raw(p, opt);
2680 else if (fmt & DIFF_FORMAT_NAME)
2681 write_name_quoted(p->two->path, stdout, opt->line_termination);
2682 }
2683
2684 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2685 {
2686 if (fs->mode)
2687 printf(" %s mode %06o ", newdelete, fs->mode);
2688 else
2689 printf(" %s ", newdelete);
2690 write_name_quoted(fs->path, stdout, '\n');
2691 }
2692
2693
2694 static void show_mode_change(struct diff_filepair *p, int show_name)
2695 {
2696 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2697 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2698 show_name ? ' ' : '\n');
2699 if (show_name) {
2700 write_name_quoted(p->two->path, stdout, '\n');
2701 }
2702 }
2703 }
2704
2705 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2706 {
2707 char *names = pprint_rename(p->one->path, p->two->path);
2708
2709 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2710 free(names);
2711 show_mode_change(p, 0);
2712 }
2713
2714 static void diff_summary(struct diff_filepair *p)
2715 {
2716 switch(p->status) {
2717 case DIFF_STATUS_DELETED:
2718 show_file_mode_name("delete", p->one);
2719 break;
2720 case DIFF_STATUS_ADDED:
2721 show_file_mode_name("create", p->two);
2722 break;
2723 case DIFF_STATUS_COPIED:
2724 show_rename_copy("copy", p);
2725 break;
2726 case DIFF_STATUS_RENAMED:
2727 show_rename_copy("rename", p);
2728 break;
2729 default:
2730 if (p->score) {
2731 fputs(" rewrite ", stdout);
2732 write_name_quoted(p->two->path, stdout, ' ');
2733 printf("(%d%%)\n", similarity_index(p));
2734 }
2735 show_mode_change(p, !p->score);
2736 break;
2737 }
2738 }
2739
2740 struct patch_id_t {
2741 struct xdiff_emit_state xm;
2742 SHA_CTX *ctx;
2743 int patchlen;
2744 };
2745
2746 static int remove_space(char *line, int len)
2747 {
2748 int i;
2749 char *dst = line;
2750 unsigned char c;
2751
2752 for (i = 0; i < len; i++)
2753 if (!isspace((c = line[i])))
2754 *dst++ = c;
2755
2756 return dst - line;
2757 }
2758
2759 static void patch_id_consume(void *priv, char *line, unsigned long len)
2760 {
2761 struct patch_id_t *data = priv;
2762 int new_len;
2763
2764 /* Ignore line numbers when computing the SHA1 of the patch */
2765 if (!prefixcmp(line, "@@ -"))
2766 return;
2767
2768 new_len = remove_space(line, len);
2769
2770 SHA1_Update(data->ctx, line, new_len);
2771 data->patchlen += new_len;
2772 }
2773
2774 /* returns 0 upon success, and writes result into sha1 */
2775 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2776 {
2777 struct diff_queue_struct *q = &diff_queued_diff;
2778 int i;
2779 SHA_CTX ctx;
2780 struct patch_id_t data;
2781 char buffer[PATH_MAX * 4 + 20];
2782
2783 SHA1_Init(&ctx);
2784 memset(&data, 0, sizeof(struct patch_id_t));
2785 data.ctx = &ctx;
2786 data.xm.consume = patch_id_consume;
2787
2788 for (i = 0; i < q->nr; i++) {
2789 xpparam_t xpp;
2790 xdemitconf_t xecfg;
2791 xdemitcb_t ecb;
2792 mmfile_t mf1, mf2;
2793 struct diff_filepair *p = q->queue[i];
2794 int len1, len2;
2795
2796 memset(&xecfg, 0, sizeof(xecfg));
2797 if (p->status == 0)
2798 return error("internal diff status error");
2799 if (p->status == DIFF_STATUS_UNKNOWN)
2800 continue;
2801 if (diff_unmodified_pair(p))
2802 continue;
2803 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2804 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2805 continue;
2806 if (DIFF_PAIR_UNMERGED(p))
2807 continue;
2808
2809 diff_fill_sha1_info(p->one);
2810 diff_fill_sha1_info(p->two);
2811 if (fill_mmfile(&mf1, p->one) < 0 ||
2812 fill_mmfile(&mf2, p->two) < 0)
2813 return error("unable to read files to diff");
2814
2815 len1 = remove_space(p->one->path, strlen(p->one->path));
2816 len2 = remove_space(p->two->path, strlen(p->two->path));
2817 if (p->one->mode == 0)
2818 len1 = snprintf(buffer, sizeof(buffer),
2819 "diff--gita/%.*sb/%.*s"
2820 "newfilemode%06o"
2821 "---/dev/null"
2822 "+++b/%.*s",
2823 len1, p->one->path,
2824 len2, p->two->path,
2825 p->two->mode,
2826 len2, p->two->path);
2827 else if (p->two->mode == 0)
2828 len1 = snprintf(buffer, sizeof(buffer),
2829 "diff--gita/%.*sb/%.*s"
2830 "deletedfilemode%06o"
2831 "---a/%.*s"
2832 "+++/dev/null",
2833 len1, p->one->path,
2834 len2, p->two->path,
2835 p->one->mode,
2836 len1, p->one->path);
2837 else
2838 len1 = snprintf(buffer, sizeof(buffer),
2839 "diff--gita/%.*sb/%.*s"
2840 "---a/%.*s"
2841 "+++b/%.*s",
2842 len1, p->one->path,
2843 len2, p->two->path,
2844 len1, p->one->path,
2845 len2, p->two->path);
2846 SHA1_Update(&ctx, buffer, len1);
2847
2848 xpp.flags = XDF_NEED_MINIMAL;
2849 xecfg.ctxlen = 3;
2850 xecfg.flags = XDL_EMIT_FUNCNAMES;
2851 ecb.outf = xdiff_outf;
2852 ecb.priv = &data;
2853 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2854 }
2855
2856 SHA1_Final(sha1, &ctx);
2857 return 0;
2858 }
2859
2860 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2861 {
2862 struct diff_queue_struct *q = &diff_queued_diff;
2863 int i;
2864 int result = diff_get_patch_id(options, sha1);
2865
2866 for (i = 0; i < q->nr; i++)
2867 diff_free_filepair(q->queue[i]);
2868
2869 free(q->queue);
2870 q->queue = NULL;
2871 q->nr = q->alloc = 0;
2872
2873 return result;
2874 }
2875
2876 static int is_summary_empty(const struct diff_queue_struct *q)
2877 {
2878 int i;
2879
2880 for (i = 0; i < q->nr; i++) {
2881 const struct diff_filepair *p = q->queue[i];
2882
2883 switch (p->status) {
2884 case DIFF_STATUS_DELETED:
2885 case DIFF_STATUS_ADDED:
2886 case DIFF_STATUS_COPIED:
2887 case DIFF_STATUS_RENAMED:
2888 return 0;
2889 default:
2890 if (p->score)
2891 return 0;
2892 if (p->one->mode && p->two->mode &&
2893 p->one->mode != p->two->mode)
2894 return 0;
2895 break;
2896 }
2897 }
2898 return 1;
2899 }
2900
2901 void diff_flush(struct diff_options *options)
2902 {
2903 struct diff_queue_struct *q = &diff_queued_diff;
2904 int i, output_format = options->output_format;
2905 int separator = 0;
2906
2907 /*
2908 * Order: raw, stat, summary, patch
2909 * or: name/name-status/checkdiff (other bits clear)
2910 */
2911 if (!q->nr)
2912 goto free_queue;
2913
2914 if (output_format & (DIFF_FORMAT_RAW |
2915 DIFF_FORMAT_NAME |
2916 DIFF_FORMAT_NAME_STATUS |
2917 DIFF_FORMAT_CHECKDIFF)) {
2918 for (i = 0; i < q->nr; i++) {
2919 struct diff_filepair *p = q->queue[i];
2920 if (check_pair_status(p))
2921 flush_one_pair(p, options);
2922 }
2923 separator++;
2924 }
2925
2926 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2927 struct diffstat_t diffstat;
2928
2929 memset(&diffstat, 0, sizeof(struct diffstat_t));
2930 diffstat.xm.consume = diffstat_consume;
2931 for (i = 0; i < q->nr; i++) {
2932 struct diff_filepair *p = q->queue[i];
2933 if (check_pair_status(p))
2934 diff_flush_stat(p, options, &diffstat);
2935 }
2936 if (output_format & DIFF_FORMAT_NUMSTAT)
2937 show_numstat(&diffstat, options);
2938 if (output_format & DIFF_FORMAT_DIFFSTAT)
2939 show_stats(&diffstat, options);
2940 if (output_format & DIFF_FORMAT_SHORTSTAT)
2941 show_shortstats(&diffstat);
2942 free_diffstat_info(&diffstat);
2943 separator++;
2944 }
2945
2946 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2947 for (i = 0; i < q->nr; i++)
2948 diff_summary(q->queue[i]);
2949 separator++;
2950 }
2951
2952 if (output_format & DIFF_FORMAT_PATCH) {
2953 if (separator) {
2954 if (options->stat_sep) {
2955 /* attach patch instead of inline */
2956 fputs(options->stat_sep, stdout);
2957 } else {
2958 putchar(options->line_termination);
2959 }
2960 }
2961
2962 for (i = 0; i < q->nr; i++) {
2963 struct diff_filepair *p = q->queue[i];
2964 if (check_pair_status(p))
2965 diff_flush_patch(p, options);
2966 }
2967 }
2968
2969 if (output_format & DIFF_FORMAT_CALLBACK)
2970 options->format_callback(q, options, options->format_callback_data);
2971
2972 for (i = 0; i < q->nr; i++)
2973 diff_free_filepair(q->queue[i]);
2974 free_queue:
2975 free(q->queue);
2976 q->queue = NULL;
2977 q->nr = q->alloc = 0;
2978 }
2979
2980 static void diffcore_apply_filter(const char *filter)
2981 {
2982 int i;
2983 struct diff_queue_struct *q = &diff_queued_diff;
2984 struct diff_queue_struct outq;
2985 outq.queue = NULL;
2986 outq.nr = outq.alloc = 0;
2987
2988 if (!filter)
2989 return;
2990
2991 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2992 int found;
2993 for (i = found = 0; !found && i < q->nr; i++) {
2994 struct diff_filepair *p = q->queue[i];
2995 if (((p->status == DIFF_STATUS_MODIFIED) &&
2996 ((p->score &&
2997 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2998 (!p->score &&
2999 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3000 ((p->status != DIFF_STATUS_MODIFIED) &&
3001 strchr(filter, p->status)))
3002 found++;
3003 }
3004 if (found)
3005 return;
3006
3007 /* otherwise we will clear the whole queue
3008 * by copying the empty outq at the end of this
3009 * function, but first clear the current entries
3010 * in the queue.
3011 */
3012 for (i = 0; i < q->nr; i++)
3013 diff_free_filepair(q->queue[i]);
3014 }
3015 else {
3016 /* Only the matching ones */
3017 for (i = 0; i < q->nr; i++) {
3018 struct diff_filepair *p = q->queue[i];
3019
3020 if (((p->status == DIFF_STATUS_MODIFIED) &&
3021 ((p->score &&
3022 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3023 (!p->score &&
3024 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3025 ((p->status != DIFF_STATUS_MODIFIED) &&
3026 strchr(filter, p->status)))
3027 diff_q(&outq, p);
3028 else
3029 diff_free_filepair(p);
3030 }
3031 }
3032 free(q->queue);
3033 *q = outq;
3034 }
3035
3036 /* Check whether two filespecs with the same mode and size are identical */
3037 static int diff_filespec_is_identical(struct diff_filespec *one,
3038 struct diff_filespec *two)
3039 {
3040 if (S_ISGITLINK(one->mode)) {
3041 diff_fill_sha1_info(one);
3042 diff_fill_sha1_info(two);
3043 return !hashcmp(one->sha1, two->sha1);
3044 }
3045 if (diff_populate_filespec(one, 0))
3046 return 0;
3047 if (diff_populate_filespec(two, 0))
3048 return 0;
3049 return !memcmp(one->data, two->data, one->size);
3050 }
3051
3052 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3053 {
3054 int i;
3055 struct diff_queue_struct *q = &diff_queued_diff;
3056 struct diff_queue_struct outq;
3057 outq.queue = NULL;
3058 outq.nr = outq.alloc = 0;
3059
3060 for (i = 0; i < q->nr; i++) {
3061 struct diff_filepair *p = q->queue[i];
3062
3063 /*
3064 * 1. Entries that come from stat info dirtyness
3065 * always have both sides (iow, not create/delete),
3066 * one side of the object name is unknown, with
3067 * the same mode and size. Keep the ones that
3068 * do not match these criteria. They have real
3069 * differences.
3070 *
3071 * 2. At this point, the file is known to be modified,
3072 * with the same mode and size, and the object
3073 * name of one side is unknown. Need to inspect
3074 * the identical contents.
3075 */
3076 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3077 !DIFF_FILE_VALID(p->two) ||
3078 (p->one->sha1_valid && p->two->sha1_valid) ||
3079 (p->one->mode != p->two->mode) ||
3080 diff_populate_filespec(p->one, 1) ||
3081 diff_populate_filespec(p->two, 1) ||
3082 (p->one->size != p->two->size) ||
3083 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3084 diff_q(&outq, p);
3085 else {
3086 /*
3087 * The caller can subtract 1 from skip_stat_unmatch
3088 * to determine how many paths were dirty only
3089 * due to stat info mismatch.
3090 */
3091 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3092 diffopt->skip_stat_unmatch++;
3093 diff_free_filepair(p);
3094 }
3095 }
3096 free(q->queue);
3097 *q = outq;
3098 }
3099
3100 void diffcore_std(struct diff_options *options)
3101 {
3102 if (DIFF_OPT_TST(options, QUIET))
3103 return;
3104
3105 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3106 diffcore_skip_stat_unmatch(options);
3107 if (options->break_opt != -1)
3108 diffcore_break(options->break_opt);
3109 if (options->detect_rename)
3110 diffcore_rename(options);
3111 if (options->break_opt != -1)
3112 diffcore_merge_broken();
3113 if (options->pickaxe)
3114 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3115 if (options->orderfile)
3116 diffcore_order(options->orderfile);
3117 diff_resolve_rename_copy();
3118 diffcore_apply_filter(options->filter);
3119
3120 if (diff_queued_diff.nr)
3121 DIFF_OPT_SET(options, HAS_CHANGES);
3122 else
3123 DIFF_OPT_CLR(options, HAS_CHANGES);
3124 }
3125
3126 int diff_result_code(struct diff_options *opt, int status)
3127 {
3128 int result = 0;
3129 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3130 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3131 return status;
3132 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3133 DIFF_OPT_TST(opt, HAS_CHANGES))
3134 result |= 01;
3135 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3136 DIFF_OPT_TST(opt, CHECK_FAILED))
3137 result |= 02;
3138 return result;
3139 }
3140
3141 void diff_addremove(struct diff_options *options,
3142 int addremove, unsigned mode,
3143 const unsigned char *sha1,
3144 const char *base, const char *path)
3145 {
3146 char concatpath[PATH_MAX];
3147 struct diff_filespec *one, *two;
3148
3149 /* This may look odd, but it is a preparation for
3150 * feeding "there are unchanged files which should
3151 * not produce diffs, but when you are doing copy
3152 * detection you would need them, so here they are"
3153 * entries to the diff-core. They will be prefixed
3154 * with something like '=' or '*' (I haven't decided
3155 * which but should not make any difference).
3156 * Feeding the same new and old to diff_change()
3157 * also has the same effect.
3158 * Before the final output happens, they are pruned after
3159 * merged into rename/copy pairs as appropriate.
3160 */
3161 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3162 addremove = (addremove == '+' ? '-' :
3163 addremove == '-' ? '+' : addremove);
3164
3165 if (!path) path = "";
3166 sprintf(concatpath, "%s%s", base, path);
3167 one = alloc_filespec(concatpath);
3168 two = alloc_filespec(concatpath);
3169
3170 if (addremove != '+')
3171 fill_filespec(one, sha1, mode);
3172 if (addremove != '-')
3173 fill_filespec(two, sha1, mode);
3174
3175 diff_queue(&diff_queued_diff, one, two);
3176 DIFF_OPT_SET(options, HAS_CHANGES);
3177 }
3178
3179 void diff_change(struct diff_options *options,
3180 unsigned old_mode, unsigned new_mode,
3181 const unsigned char *old_sha1,
3182 const unsigned char *new_sha1,
3183 const char *base, const char *path)
3184 {
3185 char concatpath[PATH_MAX];
3186 struct diff_filespec *one, *two;
3187
3188 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3189 unsigned tmp;
3190 const unsigned char *tmp_c;
3191 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3192 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3193 }
3194 if (!path) path = "";
3195 sprintf(concatpath, "%s%s", base, path);
3196 one = alloc_filespec(concatpath);
3197 two = alloc_filespec(concatpath);
3198 fill_filespec(one, old_sha1, old_mode);
3199 fill_filespec(two, new_sha1, new_mode);
3200
3201 diff_queue(&diff_queued_diff, one, two);
3202 DIFF_OPT_SET(options, HAS_CHANGES);
3203 }
3204
3205 void diff_unmerge(struct diff_options *options,
3206 const char *path,
3207 unsigned mode, const unsigned char *sha1)
3208 {
3209 struct diff_filespec *one, *two;
3210 one = alloc_filespec(path);
3211 two = alloc_filespec(path);
3212 fill_filespec(one, sha1, mode);
3213 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3214 }
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