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Technical documentation of the run-command API.
[git/platforms/storm.git] / diff.c
blob58fe7750f9ca7d63192164a3ac8da27553489d11
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 const 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 return git_config_string(&(drv->cmd), var, value);
90 }
91
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 */
97 static struct funcname_pattern {
98 char *name;
99 char *pattern;
100 struct funcname_pattern *next;
101 } *funcname_pattern_list;
102
103 static 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) {
116 pp = xcalloc(1, sizeof(*pp));
117 pp->name = xmemdupz(name, namelen);
118 pp->next = funcname_pattern_list;
119 funcname_pattern_list = pp;
120 }
121 if (pp->pattern)
122 free(pp->pattern);
123 pp->pattern = xstrdup(value);
124 return 0;
125 }
126
127 /*
128 * These are to give UI layer defaults.
129 * The core-level commands such as git-diff-files should
130 * never be affected by the setting of diff.renames
131 * the user happens to have in the configuration file.
132 */
133 int git_diff_ui_config(const char *var, const char *value)
134 {
135 if (!strcmp(var, "diff.renamelimit")) {
136 diff_rename_limit_default = git_config_int(var, value);
137 return 0;
138 }
139 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
140 diff_use_color_default = git_config_colorbool(var, value, -1);
141 return 0;
142 }
143 if (!strcmp(var, "diff.renames")) {
144 if (!value)
145 diff_detect_rename_default = DIFF_DETECT_RENAME;
146 else if (!strcasecmp(value, "copies") ||
147 !strcasecmp(value, "copy"))
148 diff_detect_rename_default = DIFF_DETECT_COPY;
149 else if (git_config_bool(var,value))
150 diff_detect_rename_default = DIFF_DETECT_RENAME;
151 return 0;
152 }
153 if (!strcmp(var, "diff.autorefreshindex")) {
154 diff_auto_refresh_index = git_config_bool(var, value);
155 return 0;
156 }
157 if (!strcmp(var, "diff.external")) {
158 if (!value)
159 return config_error_nonbool(var);
160 external_diff_cmd_cfg = xstrdup(value);
161 return 0;
162 }
163 if (!prefixcmp(var, "diff.")) {
164 const char *ep = strrchr(var, '.');
165
166 if (ep != var + 4 && !strcmp(ep, ".command"))
167 return parse_lldiff_command(var, ep, value);
168 }
169
170 return git_diff_basic_config(var, value);
171 }
172
173 int git_diff_basic_config(const char *var, const char *value)
174 {
175 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
176 int slot = parse_diff_color_slot(var, 11);
177 if (!value)
178 return config_error_nonbool(var);
179 color_parse(value, var, diff_colors[slot]);
180 return 0;
181 }
182
183 if (!prefixcmp(var, "diff.")) {
184 const char *ep = strrchr(var, '.');
185 if (ep != var + 4) {
186 if (!strcmp(ep, ".funcname")) {
187 if (!value)
188 return config_error_nonbool(var);
189 return parse_funcname_pattern(var, ep, value);
190 }
191 }
192 }
193
194 return git_default_config(var, value);
195 }
196
197 static char *quote_two(const char *one, const char *two)
198 {
199 int need_one = quote_c_style(one, NULL, NULL, 1);
200 int need_two = quote_c_style(two, NULL, NULL, 1);
201 struct strbuf res;
202
203 strbuf_init(&res, 0);
204 if (need_one + need_two) {
205 strbuf_addch(&res, '"');
206 quote_c_style(one, &res, NULL, 1);
207 quote_c_style(two, &res, NULL, 1);
208 strbuf_addch(&res, '"');
209 } else {
210 strbuf_addstr(&res, one);
211 strbuf_addstr(&res, two);
212 }
213 return strbuf_detach(&res, NULL);
214 }
215
216 static const char *external_diff(void)
217 {
218 static const char *external_diff_cmd = NULL;
219 static int done_preparing = 0;
220
221 if (done_preparing)
222 return external_diff_cmd;
223 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
224 if (!external_diff_cmd)
225 external_diff_cmd = external_diff_cmd_cfg;
226 done_preparing = 1;
227 return external_diff_cmd;
228 }
229
230 static struct diff_tempfile {
231 const char *name; /* filename external diff should read from */
232 char hex[41];
233 char mode[10];
234 char tmp_path[PATH_MAX];
235 } diff_temp[2];
236
237 static int count_lines(const char *data, int size)
238 {
239 int count, ch, completely_empty = 1, nl_just_seen = 0;
240 count = 0;
241 while (0 < size--) {
242 ch = *data++;
243 if (ch == '\n') {
244 count++;
245 nl_just_seen = 1;
246 completely_empty = 0;
247 }
248 else {
249 nl_just_seen = 0;
250 completely_empty = 0;
251 }
252 }
253 if (completely_empty)
254 return 0;
255 if (!nl_just_seen)
256 count++; /* no trailing newline */
257 return count;
258 }
259
260 static void print_line_count(int count)
261 {
262 switch (count) {
263 case 0:
264 printf("0,0");
265 break;
266 case 1:
267 printf("1");
268 break;
269 default:
270 printf("1,%d", count);
271 break;
272 }
273 }
274
275 static void copy_file(int prefix, const char *data, int size,
276 const char *set, const char *reset)
277 {
278 int ch, nl_just_seen = 1;
279 while (0 < size--) {
280 ch = *data++;
281 if (nl_just_seen) {
282 fputs(set, stdout);
283 putchar(prefix);
284 }
285 if (ch == '\n') {
286 nl_just_seen = 1;
287 fputs(reset, stdout);
288 } else
289 nl_just_seen = 0;
290 putchar(ch);
291 }
292 if (!nl_just_seen)
293 printf("%s\n\\ No newline at end of file\n", reset);
294 }
295
296 static void emit_rewrite_diff(const char *name_a,
297 const char *name_b,
298 struct diff_filespec *one,
299 struct diff_filespec *two,
300 struct diff_options *o)
301 {
302 int lc_a, lc_b;
303 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
304 const char *name_a_tab, *name_b_tab;
305 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
306 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
307 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
308 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
309 const char *reset = diff_get_color(color_diff, DIFF_RESET);
310 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
311
312 name_a += (*name_a == '/');
313 name_b += (*name_b == '/');
314 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
315 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
316
317 strbuf_reset(&a_name);
318 strbuf_reset(&b_name);
319 quote_two_c_style(&a_name, o->a_prefix, name_a, 0);
320 quote_two_c_style(&b_name, o->b_prefix, name_b, 0);
321
322 diff_populate_filespec(one, 0);
323 diff_populate_filespec(two, 0);
324 lc_a = count_lines(one->data, one->size);
325 lc_b = count_lines(two->data, two->size);
326 printf("%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
327 metainfo, a_name.buf, name_a_tab, reset,
328 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
329 print_line_count(lc_a);
330 printf(" +");
331 print_line_count(lc_b);
332 printf(" @@%s\n", reset);
333 if (lc_a)
334 copy_file('-', one->data, one->size, old, reset);
335 if (lc_b)
336 copy_file('+', two->data, two->size, new, reset);
337 }
338
339 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
340 {
341 if (!DIFF_FILE_VALID(one)) {
342 mf->ptr = (char *)""; /* does not matter */
343 mf->size = 0;
344 return 0;
345 }
346 else if (diff_populate_filespec(one, 0))
347 return -1;
348 mf->ptr = one->data;
349 mf->size = one->size;
350 return 0;
351 }
352
353 struct diff_words_buffer {
354 mmfile_t text;
355 long alloc;
356 long current; /* output pointer */
357 int suppressed_newline;
358 };
359
360 static void diff_words_append(char *line, unsigned long len,
361 struct diff_words_buffer *buffer)
362 {
363 if (buffer->text.size + len > buffer->alloc) {
364 buffer->alloc = (buffer->text.size + len) * 3 / 2;
365 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
366 }
367 line++;
368 len--;
369 memcpy(buffer->text.ptr + buffer->text.size, line, len);
370 buffer->text.size += len;
371 }
372
373 struct diff_words_data {
374 struct xdiff_emit_state xm;
375 struct diff_words_buffer minus, plus;
376 };
377
378 static void print_word(struct diff_words_buffer *buffer, int len, int color,
379 int suppress_newline)
380 {
381 const char *ptr;
382 int eol = 0;
383
384 if (len == 0)
385 return;
386
387 ptr = buffer->text.ptr + buffer->current;
388 buffer->current += len;
389
390 if (ptr[len - 1] == '\n') {
391 eol = 1;
392 len--;
393 }
394
395 fputs(diff_get_color(1, color), stdout);
396 fwrite(ptr, len, 1, stdout);
397 fputs(diff_get_color(1, DIFF_RESET), stdout);
398
399 if (eol) {
400 if (suppress_newline)
401 buffer->suppressed_newline = 1;
402 else
403 putchar('\n');
404 }
405 }
406
407 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
408 {
409 struct diff_words_data *diff_words = priv;
410
411 if (diff_words->minus.suppressed_newline) {
412 if (line[0] != '+')
413 putchar('\n');
414 diff_words->minus.suppressed_newline = 0;
415 }
416
417 len--;
418 switch (line[0]) {
419 case '-':
420 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
421 break;
422 case '+':
423 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
424 break;
425 case ' ':
426 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
427 diff_words->minus.current += len;
428 break;
429 }
430 }
431
432 /* this executes the word diff on the accumulated buffers */
433 static void diff_words_show(struct diff_words_data *diff_words)
434 {
435 xpparam_t xpp;
436 xdemitconf_t xecfg;
437 xdemitcb_t ecb;
438 mmfile_t minus, plus;
439 int i;
440
441 memset(&xecfg, 0, sizeof(xecfg));
442 minus.size = diff_words->minus.text.size;
443 minus.ptr = xmalloc(minus.size);
444 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
445 for (i = 0; i < minus.size; i++)
446 if (isspace(minus.ptr[i]))
447 minus.ptr[i] = '\n';
448 diff_words->minus.current = 0;
449
450 plus.size = diff_words->plus.text.size;
451 plus.ptr = xmalloc(plus.size);
452 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
453 for (i = 0; i < plus.size; i++)
454 if (isspace(plus.ptr[i]))
455 plus.ptr[i] = '\n';
456 diff_words->plus.current = 0;
457
458 xpp.flags = XDF_NEED_MINIMAL;
459 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
460 ecb.outf = xdiff_outf;
461 ecb.priv = diff_words;
462 diff_words->xm.consume = fn_out_diff_words_aux;
463 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
464
465 free(minus.ptr);
466 free(plus.ptr);
467 diff_words->minus.text.size = diff_words->plus.text.size = 0;
468
469 if (diff_words->minus.suppressed_newline) {
470 putchar('\n');
471 diff_words->minus.suppressed_newline = 0;
472 }
473 }
474
475 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
476
477 struct emit_callback {
478 struct xdiff_emit_state xm;
479 int nparents, color_diff;
480 unsigned ws_rule;
481 sane_truncate_fn truncate;
482 const char **label_path;
483 struct diff_words_data *diff_words;
484 int *found_changesp;
485 };
486
487 static void free_diff_words_data(struct emit_callback *ecbdata)
488 {
489 if (ecbdata->diff_words) {
490 /* flush buffers */
491 if (ecbdata->diff_words->minus.text.size ||
492 ecbdata->diff_words->plus.text.size)
493 diff_words_show(ecbdata->diff_words);
494
495 if (ecbdata->diff_words->minus.text.ptr)
496 free (ecbdata->diff_words->minus.text.ptr);
497 if (ecbdata->diff_words->plus.text.ptr)
498 free (ecbdata->diff_words->plus.text.ptr);
499 free(ecbdata->diff_words);
500 ecbdata->diff_words = NULL;
501 }
502 }
503
504 const char *diff_get_color(int diff_use_color, enum color_diff ix)
505 {
506 if (diff_use_color)
507 return diff_colors[ix];
508 return "";
509 }
510
511 static void emit_line(const char *set, const char *reset, const char *line, int len)
512 {
513 fputs(set, stdout);
514 fwrite(line, len, 1, stdout);
515 fputs(reset, stdout);
516 }
517
518 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
519 {
520 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
521 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
522
523 if (!*ws)
524 emit_line(set, reset, line, len);
525 else {
526 /* Emit just the prefix, then the rest. */
527 emit_line(set, reset, line, ecbdata->nparents);
528 (void)check_and_emit_line(line + ecbdata->nparents,
529 len - ecbdata->nparents, ecbdata->ws_rule,
530 stdout, set, reset, ws);
531 }
532 }
533
534 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
535 {
536 const char *cp;
537 unsigned long allot;
538 size_t l = len;
539
540 if (ecb->truncate)
541 return ecb->truncate(line, len);
542 cp = line;
543 allot = l;
544 while (0 < l) {
545 (void) utf8_width(&cp, &l);
546 if (!cp)
547 break; /* truncated in the middle? */
548 }
549 return allot - l;
550 }
551
552 static void fn_out_consume(void *priv, char *line, unsigned long len)
553 {
554 int i;
555 int color;
556 struct emit_callback *ecbdata = priv;
557 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
558 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
559 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
560
561 *(ecbdata->found_changesp) = 1;
562
563 if (ecbdata->label_path[0]) {
564 const char *name_a_tab, *name_b_tab;
565
566 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
567 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
568
569 printf("%s--- %s%s%s\n",
570 meta, ecbdata->label_path[0], reset, name_a_tab);
571 printf("%s+++ %s%s%s\n",
572 meta, ecbdata->label_path[1], reset, name_b_tab);
573 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
574 }
575
576 /* This is not really necessary for now because
577 * this codepath only deals with two-way diffs.
578 */
579 for (i = 0; i < len && line[i] == '@'; i++)
580 ;
581 if (2 <= i && i < len && line[i] == ' ') {
582 ecbdata->nparents = i - 1;
583 len = sane_truncate_line(ecbdata, line, len);
584 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
585 reset, line, len);
586 if (line[len-1] != '\n')
587 putchar('\n');
588 return;
589 }
590
591 if (len < ecbdata->nparents) {
592 emit_line(reset, reset, line, len);
593 return;
594 }
595
596 color = DIFF_PLAIN;
597 if (ecbdata->diff_words && ecbdata->nparents != 1)
598 /* fall back to normal diff */
599 free_diff_words_data(ecbdata);
600 if (ecbdata->diff_words) {
601 if (line[0] == '-') {
602 diff_words_append(line, len,
603 &ecbdata->diff_words->minus);
604 return;
605 } else if (line[0] == '+') {
606 diff_words_append(line, len,
607 &ecbdata->diff_words->plus);
608 return;
609 }
610 if (ecbdata->diff_words->minus.text.size ||
611 ecbdata->diff_words->plus.text.size)
612 diff_words_show(ecbdata->diff_words);
613 line++;
614 len--;
615 emit_line(plain, reset, line, len);
616 return;
617 }
618 for (i = 0; i < ecbdata->nparents && len; i++) {
619 if (line[i] == '-')
620 color = DIFF_FILE_OLD;
621 else if (line[i] == '+')
622 color = DIFF_FILE_NEW;
623 }
624
625 if (color != DIFF_FILE_NEW) {
626 emit_line(diff_get_color(ecbdata->color_diff, color),
627 reset, line, len);
628 return;
629 }
630 emit_add_line(reset, ecbdata, line, len);
631 }
632
633 static char *pprint_rename(const char *a, const char *b)
634 {
635 const char *old = a;
636 const char *new = b;
637 struct strbuf name;
638 int pfx_length, sfx_length;
639 int len_a = strlen(a);
640 int len_b = strlen(b);
641 int a_midlen, b_midlen;
642 int qlen_a = quote_c_style(a, NULL, NULL, 0);
643 int qlen_b = quote_c_style(b, NULL, NULL, 0);
644
645 strbuf_init(&name, 0);
646 if (qlen_a || qlen_b) {
647 quote_c_style(a, &name, NULL, 0);
648 strbuf_addstr(&name, " => ");
649 quote_c_style(b, &name, NULL, 0);
650 return strbuf_detach(&name, NULL);
651 }
652
653 /* Find common prefix */
654 pfx_length = 0;
655 while (*old && *new && *old == *new) {
656 if (*old == '/')
657 pfx_length = old - a + 1;
658 old++;
659 new++;
660 }
661
662 /* Find common suffix */
663 old = a + len_a;
664 new = b + len_b;
665 sfx_length = 0;
666 while (a <= old && b <= new && *old == *new) {
667 if (*old == '/')
668 sfx_length = len_a - (old - a);
669 old--;
670 new--;
671 }
672
673 /*
674 * pfx{mid-a => mid-b}sfx
675 * {pfx-a => pfx-b}sfx
676 * pfx{sfx-a => sfx-b}
677 * name-a => name-b
678 */
679 a_midlen = len_a - pfx_length - sfx_length;
680 b_midlen = len_b - pfx_length - sfx_length;
681 if (a_midlen < 0)
682 a_midlen = 0;
683 if (b_midlen < 0)
684 b_midlen = 0;
685
686 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
687 if (pfx_length + sfx_length) {
688 strbuf_add(&name, a, pfx_length);
689 strbuf_addch(&name, '{');
690 }
691 strbuf_add(&name, a + pfx_length, a_midlen);
692 strbuf_addstr(&name, " => ");
693 strbuf_add(&name, b + pfx_length, b_midlen);
694 if (pfx_length + sfx_length) {
695 strbuf_addch(&name, '}');
696 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
697 }
698 return strbuf_detach(&name, NULL);
699 }
700
701 struct diffstat_t {
702 struct xdiff_emit_state xm;
703
704 int nr;
705 int alloc;
706 struct diffstat_file {
707 char *from_name;
708 char *name;
709 char *print_name;
710 unsigned is_unmerged:1;
711 unsigned is_binary:1;
712 unsigned is_renamed:1;
713 unsigned int added, deleted;
714 } **files;
715 };
716
717 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
718 const char *name_a,
719 const char *name_b)
720 {
721 struct diffstat_file *x;
722 x = xcalloc(sizeof (*x), 1);
723 if (diffstat->nr == diffstat->alloc) {
724 diffstat->alloc = alloc_nr(diffstat->alloc);
725 diffstat->files = xrealloc(diffstat->files,
726 diffstat->alloc * sizeof(x));
727 }
728 diffstat->files[diffstat->nr++] = x;
729 if (name_b) {
730 x->from_name = xstrdup(name_a);
731 x->name = xstrdup(name_b);
732 x->is_renamed = 1;
733 }
734 else {
735 x->from_name = NULL;
736 x->name = xstrdup(name_a);
737 }
738 return x;
739 }
740
741 static void diffstat_consume(void *priv, char *line, unsigned long len)
742 {
743 struct diffstat_t *diffstat = priv;
744 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
745
746 if (line[0] == '+')
747 x->added++;
748 else if (line[0] == '-')
749 x->deleted++;
750 }
751
752 const char mime_boundary_leader[] = "------------";
753
754 static int scale_linear(int it, int width, int max_change)
755 {
756 /*
757 * make sure that at least one '-' is printed if there were deletions,
758 * and likewise for '+'.
759 */
760 if (max_change < 2)
761 return it;
762 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
763 }
764
765 static void show_name(const char *prefix, const char *name, int len,
766 const char *reset, const char *set)
767 {
768 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
769 }
770
771 static void show_graph(char ch, int cnt, const char *set, const char *reset)
772 {
773 if (cnt <= 0)
774 return;
775 printf("%s", set);
776 while (cnt--)
777 putchar(ch);
778 printf("%s", reset);
779 }
780
781 static void fill_print_name(struct diffstat_file *file)
782 {
783 char *pname;
784
785 if (file->print_name)
786 return;
787
788 if (!file->is_renamed) {
789 struct strbuf buf;
790 strbuf_init(&buf, 0);
791 if (quote_c_style(file->name, &buf, NULL, 0)) {
792 pname = strbuf_detach(&buf, NULL);
793 } else {
794 pname = file->name;
795 strbuf_release(&buf);
796 }
797 } else {
798 pname = pprint_rename(file->from_name, file->name);
799 }
800 file->print_name = pname;
801 }
802
803 static void show_stats(struct diffstat_t* data, struct diff_options *options)
804 {
805 int i, len, add, del, total, adds = 0, dels = 0;
806 int max_change = 0, max_len = 0;
807 int total_files = data->nr;
808 int width, name_width;
809 const char *reset, *set, *add_c, *del_c;
810
811 if (data->nr == 0)
812 return;
813
814 width = options->stat_width ? options->stat_width : 80;
815 name_width = options->stat_name_width ? options->stat_name_width : 50;
816
817 /* Sanity: give at least 5 columns to the graph,
818 * but leave at least 10 columns for the name.
819 */
820 if (width < name_width + 15) {
821 if (name_width <= 25)
822 width = name_width + 15;
823 else
824 name_width = width - 15;
825 }
826
827 /* Find the longest filename and max number of changes */
828 reset = diff_get_color_opt(options, DIFF_RESET);
829 set = diff_get_color_opt(options, DIFF_PLAIN);
830 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
831 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
832
833 for (i = 0; i < data->nr; i++) {
834 struct diffstat_file *file = data->files[i];
835 int change = file->added + file->deleted;
836 fill_print_name(file);
837 len = strlen(file->print_name);
838 if (max_len < len)
839 max_len = len;
840
841 if (file->is_binary || file->is_unmerged)
842 continue;
843 if (max_change < change)
844 max_change = change;
845 }
846
847 /* Compute the width of the graph part;
848 * 10 is for one blank at the beginning of the line plus
849 * " | count " between the name and the graph.
850 *
851 * From here on, name_width is the width of the name area,
852 * and width is the width of the graph area.
853 */
854 name_width = (name_width < max_len) ? name_width : max_len;
855 if (width < (name_width + 10) + max_change)
856 width = width - (name_width + 10);
857 else
858 width = max_change;
859
860 for (i = 0; i < data->nr; i++) {
861 const char *prefix = "";
862 char *name = data->files[i]->print_name;
863 int added = data->files[i]->added;
864 int deleted = data->files[i]->deleted;
865 int name_len;
866
867 /*
868 * "scale" the filename
869 */
870 len = name_width;
871 name_len = strlen(name);
872 if (name_width < name_len) {
873 char *slash;
874 prefix = "...";
875 len -= 3;
876 name += name_len - len;
877 slash = strchr(name, '/');
878 if (slash)
879 name = slash;
880 }
881
882 if (data->files[i]->is_binary) {
883 show_name(prefix, name, len, reset, set);
884 printf(" Bin ");
885 printf("%s%d%s", del_c, deleted, reset);
886 printf(" -> ");
887 printf("%s%d%s", add_c, added, reset);
888 printf(" bytes");
889 printf("\n");
890 continue;
891 }
892 else if (data->files[i]->is_unmerged) {
893 show_name(prefix, name, len, reset, set);
894 printf(" Unmerged\n");
895 continue;
896 }
897 else if (!data->files[i]->is_renamed &&
898 (added + deleted == 0)) {
899 total_files--;
900 continue;
901 }
902
903 /*
904 * scale the add/delete
905 */
906 add = added;
907 del = deleted;
908 total = add + del;
909 adds += add;
910 dels += del;
911
912 if (width <= max_change) {
913 add = scale_linear(add, width, max_change);
914 del = scale_linear(del, width, max_change);
915 total = add + del;
916 }
917 show_name(prefix, name, len, reset, set);
918 printf("%5d ", added + deleted);
919 show_graph('+', add, add_c, reset);
920 show_graph('-', del, del_c, reset);
921 putchar('\n');
922 }
923 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
924 set, total_files, adds, dels, reset);
925 }
926
927 static void show_shortstats(struct diffstat_t* data)
928 {
929 int i, adds = 0, dels = 0, total_files = data->nr;
930
931 if (data->nr == 0)
932 return;
933
934 for (i = 0; i < data->nr; i++) {
935 if (!data->files[i]->is_binary &&
936 !data->files[i]->is_unmerged) {
937 int added = data->files[i]->added;
938 int deleted= data->files[i]->deleted;
939 if (!data->files[i]->is_renamed &&
940 (added + deleted == 0)) {
941 total_files--;
942 } else {
943 adds += added;
944 dels += deleted;
945 }
946 }
947 }
948 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
949 total_files, adds, dels);
950 }
951
952 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
953 {
954 int i;
955
956 if (data->nr == 0)
957 return;
958
959 for (i = 0; i < data->nr; i++) {
960 struct diffstat_file *file = data->files[i];
961
962 if (file->is_binary)
963 printf("-\t-\t");
964 else
965 printf("%d\t%d\t", file->added, file->deleted);
966 if (options->line_termination) {
967 fill_print_name(file);
968 if (!file->is_renamed)
969 write_name_quoted(file->name, stdout,
970 options->line_termination);
971 else {
972 fputs(file->print_name, stdout);
973 putchar(options->line_termination);
974 }
975 } else {
976 if (file->is_renamed) {
977 putchar('\0');
978 write_name_quoted(file->from_name, stdout, '\0');
979 }
980 write_name_quoted(file->name, stdout, '\0');
981 }
982 }
983 }
984
985 static void free_diffstat_info(struct diffstat_t *diffstat)
986 {
987 int i;
988 for (i = 0; i < diffstat->nr; i++) {
989 struct diffstat_file *f = diffstat->files[i];
990 if (f->name != f->print_name)
991 free(f->print_name);
992 free(f->name);
993 free(f->from_name);
994 free(f);
995 }
996 free(diffstat->files);
997 }
998
999 struct checkdiff_t {
1000 struct xdiff_emit_state xm;
1001 const char *filename;
1002 int lineno, color_diff;
1003 unsigned ws_rule;
1004 unsigned status;
1005 };
1006
1007 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1008 {
1009 struct checkdiff_t *data = priv;
1010 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1011 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1012 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
1013 char *err;
1014
1015 if (line[0] == '+') {
1016 data->lineno++;
1017 data->status = check_and_emit_line(line + 1, len - 1,
1018 data->ws_rule, NULL, NULL, NULL, NULL);
1019 if (!data->status)
1020 return;
1021 err = whitespace_error_string(data->status);
1022 printf("%s:%d: %s.\n", data->filename, data->lineno, err);
1023 free(err);
1024 emit_line(set, reset, line, 1);
1025 (void)check_and_emit_line(line + 1, len - 1, data->ws_rule,
1026 stdout, set, reset, ws);
1027 } else if (line[0] == ' ')
1028 data->lineno++;
1029 else if (line[0] == '@') {
1030 char *plus = strchr(line, '+');
1031 if (plus)
1032 data->lineno = strtol(plus, NULL, 10) - 1;
1033 else
1034 die("invalid diff");
1035 }
1036 }
1037
1038 static unsigned char *deflate_it(char *data,
1039 unsigned long size,
1040 unsigned long *result_size)
1041 {
1042 int bound;
1043 unsigned char *deflated;
1044 z_stream stream;
1045
1046 memset(&stream, 0, sizeof(stream));
1047 deflateInit(&stream, zlib_compression_level);
1048 bound = deflateBound(&stream, size);
1049 deflated = xmalloc(bound);
1050 stream.next_out = deflated;
1051 stream.avail_out = bound;
1052
1053 stream.next_in = (unsigned char *)data;
1054 stream.avail_in = size;
1055 while (deflate(&stream, Z_FINISH) == Z_OK)
1056 ; /* nothing */
1057 deflateEnd(&stream);
1058 *result_size = stream.total_out;
1059 return deflated;
1060 }
1061
1062 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1063 {
1064 void *cp;
1065 void *delta;
1066 void *deflated;
1067 void *data;
1068 unsigned long orig_size;
1069 unsigned long delta_size;
1070 unsigned long deflate_size;
1071 unsigned long data_size;
1072
1073 /* We could do deflated delta, or we could do just deflated two,
1074 * whichever is smaller.
1075 */
1076 delta = NULL;
1077 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1078 if (one->size && two->size) {
1079 delta = diff_delta(one->ptr, one->size,
1080 two->ptr, two->size,
1081 &delta_size, deflate_size);
1082 if (delta) {
1083 void *to_free = delta;
1084 orig_size = delta_size;
1085 delta = deflate_it(delta, delta_size, &delta_size);
1086 free(to_free);
1087 }
1088 }
1089
1090 if (delta && delta_size < deflate_size) {
1091 printf("delta %lu\n", orig_size);
1092 free(deflated);
1093 data = delta;
1094 data_size = delta_size;
1095 }
1096 else {
1097 printf("literal %lu\n", two->size);
1098 free(delta);
1099 data = deflated;
1100 data_size = deflate_size;
1101 }
1102
1103 /* emit data encoded in base85 */
1104 cp = data;
1105 while (data_size) {
1106 int bytes = (52 < data_size) ? 52 : data_size;
1107 char line[70];
1108 data_size -= bytes;
1109 if (bytes <= 26)
1110 line[0] = bytes + 'A' - 1;
1111 else
1112 line[0] = bytes - 26 + 'a' - 1;
1113 encode_85(line + 1, cp, bytes);
1114 cp = (char *) cp + bytes;
1115 puts(line);
1116 }
1117 printf("\n");
1118 free(data);
1119 }
1120
1121 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1122 {
1123 printf("GIT binary patch\n");
1124 emit_binary_diff_body(one, two);
1125 emit_binary_diff_body(two, one);
1126 }
1127
1128 static void setup_diff_attr_check(struct git_attr_check *check)
1129 {
1130 static struct git_attr *attr_diff;
1131
1132 if (!attr_diff) {
1133 attr_diff = git_attr("diff", 4);
1134 }
1135 check[0].attr = attr_diff;
1136 }
1137
1138 static void diff_filespec_check_attr(struct diff_filespec *one)
1139 {
1140 struct git_attr_check attr_diff_check;
1141 int check_from_data = 0;
1142
1143 if (one->checked_attr)
1144 return;
1145
1146 setup_diff_attr_check(&attr_diff_check);
1147 one->is_binary = 0;
1148 one->funcname_pattern_ident = NULL;
1149
1150 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1151 const char *value;
1152
1153 /* binaryness */
1154 value = attr_diff_check.value;
1155 if (ATTR_TRUE(value))
1156 ;
1157 else if (ATTR_FALSE(value))
1158 one->is_binary = 1;
1159 else
1160 check_from_data = 1;
1161
1162 /* funcname pattern ident */
1163 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1164 ;
1165 else
1166 one->funcname_pattern_ident = value;
1167 }
1168
1169 if (check_from_data) {
1170 if (!one->data && DIFF_FILE_VALID(one))
1171 diff_populate_filespec(one, 0);
1172
1173 if (one->data)
1174 one->is_binary = buffer_is_binary(one->data, one->size);
1175 }
1176 }
1177
1178 int diff_filespec_is_binary(struct diff_filespec *one)
1179 {
1180 diff_filespec_check_attr(one);
1181 return one->is_binary;
1182 }
1183
1184 static const char *funcname_pattern(const char *ident)
1185 {
1186 struct funcname_pattern *pp;
1187
1188 for (pp = funcname_pattern_list; pp; pp = pp->next)
1189 if (!strcmp(ident, pp->name))
1190 return pp->pattern;
1191 return NULL;
1192 }
1193
1194 static struct builtin_funcname_pattern {
1195 const char *name;
1196 const char *pattern;
1197 } builtin_funcname_pattern[] = {
1198 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1199 "new\\|return\\|switch\\|throw\\|while\\)\n"
1200 "^[ ]*\\(\\([ ]*"
1201 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1202 "[ ]*([^;]*$\\)" },
1203 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1204 };
1205
1206 static const char *diff_funcname_pattern(struct diff_filespec *one)
1207 {
1208 const char *ident, *pattern;
1209 int i;
1210
1211 diff_filespec_check_attr(one);
1212 ident = one->funcname_pattern_ident;
1213
1214 if (!ident)
1215 /*
1216 * If the config file has "funcname.default" defined, that
1217 * regexp is used; otherwise NULL is returned and xemit uses
1218 * the built-in default.
1219 */
1220 return funcname_pattern("default");
1221
1222 /* Look up custom "funcname.$ident" regexp from config. */
1223 pattern = funcname_pattern(ident);
1224 if (pattern)
1225 return pattern;
1226
1227 /*
1228 * And define built-in fallback patterns here. Note that
1229 * these can be overridden by the user's config settings.
1230 */
1231 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1232 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1233 return builtin_funcname_pattern[i].pattern;
1234
1235 return NULL;
1236 }
1237
1238 static void builtin_diff(const char *name_a,
1239 const char *name_b,
1240 struct diff_filespec *one,
1241 struct diff_filespec *two,
1242 const char *xfrm_msg,
1243 struct diff_options *o,
1244 int complete_rewrite)
1245 {
1246 mmfile_t mf1, mf2;
1247 const char *lbl[2];
1248 char *a_one, *b_two;
1249 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1250 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1251
1252 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1253 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
1254 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1255 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1256 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1257 if (lbl[0][0] == '/') {
1258 /* /dev/null */
1259 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1260 if (xfrm_msg && xfrm_msg[0])
1261 printf("%s%s%s\n", set, xfrm_msg, reset);
1262 }
1263 else if (lbl[1][0] == '/') {
1264 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1265 if (xfrm_msg && xfrm_msg[0])
1266 printf("%s%s%s\n", set, xfrm_msg, reset);
1267 }
1268 else {
1269 if (one->mode != two->mode) {
1270 printf("%sold mode %06o%s\n", set, one->mode, reset);
1271 printf("%snew mode %06o%s\n", set, two->mode, reset);
1272 }
1273 if (xfrm_msg && xfrm_msg[0])
1274 printf("%s%s%s\n", set, xfrm_msg, reset);
1275 /*
1276 * we do not run diff between different kind
1277 * of objects.
1278 */
1279 if ((one->mode ^ two->mode) & S_IFMT)
1280 goto free_ab_and_return;
1281 if (complete_rewrite) {
1282 emit_rewrite_diff(name_a, name_b, one, two, o);
1283 o->found_changes = 1;
1284 goto free_ab_and_return;
1285 }
1286 }
1287
1288 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1289 die("unable to read files to diff");
1290
1291 if (!DIFF_OPT_TST(o, TEXT) &&
1292 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1293 /* Quite common confusing case */
1294 if (mf1.size == mf2.size &&
1295 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1296 goto free_ab_and_return;
1297 if (DIFF_OPT_TST(o, BINARY))
1298 emit_binary_diff(&mf1, &mf2);
1299 else
1300 printf("Binary files %s and %s differ\n",
1301 lbl[0], lbl[1]);
1302 o->found_changes = 1;
1303 }
1304 else {
1305 /* Crazy xdl interfaces.. */
1306 const char *diffopts = getenv("GIT_DIFF_OPTS");
1307 xpparam_t xpp;
1308 xdemitconf_t xecfg;
1309 xdemitcb_t ecb;
1310 struct emit_callback ecbdata;
1311 const char *funcname_pattern;
1312
1313 funcname_pattern = diff_funcname_pattern(one);
1314 if (!funcname_pattern)
1315 funcname_pattern = diff_funcname_pattern(two);
1316
1317 memset(&xecfg, 0, sizeof(xecfg));
1318 memset(&ecbdata, 0, sizeof(ecbdata));
1319 ecbdata.label_path = lbl;
1320 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1321 ecbdata.found_changesp = &o->found_changes;
1322 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1323 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1324 xecfg.ctxlen = o->context;
1325 xecfg.flags = XDL_EMIT_FUNCNAMES;
1326 if (funcname_pattern)
1327 xdiff_set_find_func(&xecfg, funcname_pattern);
1328 if (!diffopts)
1329 ;
1330 else if (!prefixcmp(diffopts, "--unified="))
1331 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1332 else if (!prefixcmp(diffopts, "-u"))
1333 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1334 ecb.outf = xdiff_outf;
1335 ecb.priv = &ecbdata;
1336 ecbdata.xm.consume = fn_out_consume;
1337 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1338 ecbdata.diff_words =
1339 xcalloc(1, sizeof(struct diff_words_data));
1340 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1341 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1342 free_diff_words_data(&ecbdata);
1343 }
1344
1345 free_ab_and_return:
1346 diff_free_filespec_data(one);
1347 diff_free_filespec_data(two);
1348 free(a_one);
1349 free(b_two);
1350 return;
1351 }
1352
1353 static void builtin_diffstat(const char *name_a, const char *name_b,
1354 struct diff_filespec *one,
1355 struct diff_filespec *two,
1356 struct diffstat_t *diffstat,
1357 struct diff_options *o,
1358 int complete_rewrite)
1359 {
1360 mmfile_t mf1, mf2;
1361 struct diffstat_file *data;
1362
1363 data = diffstat_add(diffstat, name_a, name_b);
1364
1365 if (!one || !two) {
1366 data->is_unmerged = 1;
1367 return;
1368 }
1369 if (complete_rewrite) {
1370 diff_populate_filespec(one, 0);
1371 diff_populate_filespec(two, 0);
1372 data->deleted = count_lines(one->data, one->size);
1373 data->added = count_lines(two->data, two->size);
1374 goto free_and_return;
1375 }
1376 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1377 die("unable to read files to diff");
1378
1379 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1380 data->is_binary = 1;
1381 data->added = mf2.size;
1382 data->deleted = mf1.size;
1383 } else {
1384 /* Crazy xdl interfaces.. */
1385 xpparam_t xpp;
1386 xdemitconf_t xecfg;
1387 xdemitcb_t ecb;
1388
1389 memset(&xecfg, 0, sizeof(xecfg));
1390 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1391 ecb.outf = xdiff_outf;
1392 ecb.priv = diffstat;
1393 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1394 }
1395
1396 free_and_return:
1397 diff_free_filespec_data(one);
1398 diff_free_filespec_data(two);
1399 }
1400
1401 static void builtin_checkdiff(const char *name_a, const char *name_b,
1402 struct diff_filespec *one,
1403 struct diff_filespec *two, struct diff_options *o)
1404 {
1405 mmfile_t mf1, mf2;
1406 struct checkdiff_t data;
1407
1408 if (!two)
1409 return;
1410
1411 memset(&data, 0, sizeof(data));
1412 data.xm.consume = checkdiff_consume;
1413 data.filename = name_b ? name_b : name_a;
1414 data.lineno = 0;
1415 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1416 data.ws_rule = whitespace_rule(data.filename);
1417
1418 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1419 die("unable to read files to diff");
1420
1421 if (diff_filespec_is_binary(two))
1422 goto free_and_return;
1423 else {
1424 /* Crazy xdl interfaces.. */
1425 xpparam_t xpp;
1426 xdemitconf_t xecfg;
1427 xdemitcb_t ecb;
1428
1429 memset(&xecfg, 0, sizeof(xecfg));
1430 xpp.flags = XDF_NEED_MINIMAL;
1431 ecb.outf = xdiff_outf;
1432 ecb.priv = &data;
1433 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1434 }
1435 free_and_return:
1436 diff_free_filespec_data(one);
1437 diff_free_filespec_data(two);
1438 if (data.status)
1439 DIFF_OPT_SET(o, CHECK_FAILED);
1440 }
1441
1442 struct diff_filespec *alloc_filespec(const char *path)
1443 {
1444 int namelen = strlen(path);
1445 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1446
1447 memset(spec, 0, sizeof(*spec));
1448 spec->path = (char *)(spec + 1);
1449 memcpy(spec->path, path, namelen+1);
1450 spec->count = 1;
1451 return spec;
1452 }
1453
1454 void free_filespec(struct diff_filespec *spec)
1455 {
1456 if (!--spec->count) {
1457 diff_free_filespec_data(spec);
1458 free(spec);
1459 }
1460 }
1461
1462 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1463 unsigned short mode)
1464 {
1465 if (mode) {
1466 spec->mode = canon_mode(mode);
1467 hashcpy(spec->sha1, sha1);
1468 spec->sha1_valid = !is_null_sha1(sha1);
1469 }
1470 }
1471
1472 /*
1473 * Given a name and sha1 pair, if the index tells us the file in
1474 * the work tree has that object contents, return true, so that
1475 * prepare_temp_file() does not have to inflate and extract.
1476 */
1477 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1478 {
1479 struct cache_entry *ce;
1480 struct stat st;
1481 int pos, len;
1482
1483 /* We do not read the cache ourselves here, because the
1484 * benchmark with my previous version that always reads cache
1485 * shows that it makes things worse for diff-tree comparing
1486 * two linux-2.6 kernel trees in an already checked out work
1487 * tree. This is because most diff-tree comparisons deal with
1488 * only a small number of files, while reading the cache is
1489 * expensive for a large project, and its cost outweighs the
1490 * savings we get by not inflating the object to a temporary
1491 * file. Practically, this code only helps when we are used
1492 * by diff-cache --cached, which does read the cache before
1493 * calling us.
1494 */
1495 if (!active_cache)
1496 return 0;
1497
1498 /* We want to avoid the working directory if our caller
1499 * doesn't need the data in a normal file, this system
1500 * is rather slow with its stat/open/mmap/close syscalls,
1501 * and the object is contained in a pack file. The pack
1502 * is probably already open and will be faster to obtain
1503 * the data through than the working directory. Loose
1504 * objects however would tend to be slower as they need
1505 * to be individually opened and inflated.
1506 */
1507 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1508 return 0;
1509
1510 len = strlen(name);
1511 pos = cache_name_pos(name, len);
1512 if (pos < 0)
1513 return 0;
1514 ce = active_cache[pos];
1515
1516 /*
1517 * This is not the sha1 we are looking for, or
1518 * unreusable because it is not a regular file.
1519 */
1520 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1521 return 0;
1522
1523 /*
1524 * If ce matches the file in the work tree, we can reuse it.
1525 */
1526 if (ce_uptodate(ce) ||
1527 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1528 return 1;
1529
1530 return 0;
1531 }
1532
1533 static int populate_from_stdin(struct diff_filespec *s)
1534 {
1535 struct strbuf buf;
1536 size_t size = 0;
1537
1538 strbuf_init(&buf, 0);
1539 if (strbuf_read(&buf, 0, 0) < 0)
1540 return error("error while reading from stdin %s",
1541 strerror(errno));
1542
1543 s->should_munmap = 0;
1544 s->data = strbuf_detach(&buf, &size);
1545 s->size = size;
1546 s->should_free = 1;
1547 return 0;
1548 }
1549
1550 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1551 {
1552 int len;
1553 char *data = xmalloc(100);
1554 len = snprintf(data, 100,
1555 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1556 s->data = data;
1557 s->size = len;
1558 s->should_free = 1;
1559 if (size_only) {
1560 s->data = NULL;
1561 free(data);
1562 }
1563 return 0;
1564 }
1565
1566 /*
1567 * While doing rename detection and pickaxe operation, we may need to
1568 * grab the data for the blob (or file) for our own in-core comparison.
1569 * diff_filespec has data and size fields for this purpose.
1570 */
1571 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1572 {
1573 int err = 0;
1574 if (!DIFF_FILE_VALID(s))
1575 die("internal error: asking to populate invalid file.");
1576 if (S_ISDIR(s->mode))
1577 return -1;
1578
1579 if (s->data)
1580 return 0;
1581
1582 if (size_only && 0 < s->size)
1583 return 0;
1584
1585 if (S_ISGITLINK(s->mode))
1586 return diff_populate_gitlink(s, size_only);
1587
1588 if (!s->sha1_valid ||
1589 reuse_worktree_file(s->path, s->sha1, 0)) {
1590 struct strbuf buf;
1591 struct stat st;
1592 int fd;
1593
1594 if (!strcmp(s->path, "-"))
1595 return populate_from_stdin(s);
1596
1597 if (lstat(s->path, &st) < 0) {
1598 if (errno == ENOENT) {
1599 err_empty:
1600 err = -1;
1601 empty:
1602 s->data = (char *)"";
1603 s->size = 0;
1604 return err;
1605 }
1606 }
1607 s->size = xsize_t(st.st_size);
1608 if (!s->size)
1609 goto empty;
1610 if (size_only)
1611 return 0;
1612 if (S_ISLNK(st.st_mode)) {
1613 int ret;
1614 s->data = xmalloc(s->size);
1615 s->should_free = 1;
1616 ret = readlink(s->path, s->data, s->size);
1617 if (ret < 0) {
1618 free(s->data);
1619 goto err_empty;
1620 }
1621 return 0;
1622 }
1623 fd = open(s->path, O_RDONLY);
1624 if (fd < 0)
1625 goto err_empty;
1626 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1627 close(fd);
1628 s->should_munmap = 1;
1629
1630 /*
1631 * Convert from working tree format to canonical git format
1632 */
1633 strbuf_init(&buf, 0);
1634 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
1635 size_t size = 0;
1636 munmap(s->data, s->size);
1637 s->should_munmap = 0;
1638 s->data = strbuf_detach(&buf, &size);
1639 s->size = size;
1640 s->should_free = 1;
1641 }
1642 }
1643 else {
1644 enum object_type type;
1645 if (size_only)
1646 type = sha1_object_info(s->sha1, &s->size);
1647 else {
1648 s->data = read_sha1_file(s->sha1, &type, &s->size);
1649 s->should_free = 1;
1650 }
1651 }
1652 return 0;
1653 }
1654
1655 void diff_free_filespec_blob(struct diff_filespec *s)
1656 {
1657 if (s->should_free)
1658 free(s->data);
1659 else if (s->should_munmap)
1660 munmap(s->data, s->size);
1661
1662 if (s->should_free || s->should_munmap) {
1663 s->should_free = s->should_munmap = 0;
1664 s->data = NULL;
1665 }
1666 }
1667
1668 void diff_free_filespec_data(struct diff_filespec *s)
1669 {
1670 diff_free_filespec_blob(s);
1671 free(s->cnt_data);
1672 s->cnt_data = NULL;
1673 }
1674
1675 static void prep_temp_blob(struct diff_tempfile *temp,
1676 void *blob,
1677 unsigned long size,
1678 const unsigned char *sha1,
1679 int mode)
1680 {
1681 int fd;
1682
1683 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1684 if (fd < 0)
1685 die("unable to create temp-file: %s", strerror(errno));
1686 if (write_in_full(fd, blob, size) != size)
1687 die("unable to write temp-file");
1688 close(fd);
1689 temp->name = temp->tmp_path;
1690 strcpy(temp->hex, sha1_to_hex(sha1));
1691 temp->hex[40] = 0;
1692 sprintf(temp->mode, "%06o", mode);
1693 }
1694
1695 static void prepare_temp_file(const char *name,
1696 struct diff_tempfile *temp,
1697 struct diff_filespec *one)
1698 {
1699 if (!DIFF_FILE_VALID(one)) {
1700 not_a_valid_file:
1701 /* A '-' entry produces this for file-2, and
1702 * a '+' entry produces this for file-1.
1703 */
1704 temp->name = "/dev/null";
1705 strcpy(temp->hex, ".");
1706 strcpy(temp->mode, ".");
1707 return;
1708 }
1709
1710 if (!one->sha1_valid ||
1711 reuse_worktree_file(name, one->sha1, 1)) {
1712 struct stat st;
1713 if (lstat(name, &st) < 0) {
1714 if (errno == ENOENT)
1715 goto not_a_valid_file;
1716 die("stat(%s): %s", name, strerror(errno));
1717 }
1718 if (S_ISLNK(st.st_mode)) {
1719 int ret;
1720 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1721 size_t sz = xsize_t(st.st_size);
1722 if (sizeof(buf) <= st.st_size)
1723 die("symlink too long: %s", name);
1724 ret = readlink(name, buf, sz);
1725 if (ret < 0)
1726 die("readlink(%s)", name);
1727 prep_temp_blob(temp, buf, sz,
1728 (one->sha1_valid ?
1729 one->sha1 : null_sha1),
1730 (one->sha1_valid ?
1731 one->mode : S_IFLNK));
1732 }
1733 else {
1734 /* we can borrow from the file in the work tree */
1735 temp->name = name;
1736 if (!one->sha1_valid)
1737 strcpy(temp->hex, sha1_to_hex(null_sha1));
1738 else
1739 strcpy(temp->hex, sha1_to_hex(one->sha1));
1740 /* Even though we may sometimes borrow the
1741 * contents from the work tree, we always want
1742 * one->mode. mode is trustworthy even when
1743 * !(one->sha1_valid), as long as
1744 * DIFF_FILE_VALID(one).
1745 */
1746 sprintf(temp->mode, "%06o", one->mode);
1747 }
1748 return;
1749 }
1750 else {
1751 if (diff_populate_filespec(one, 0))
1752 die("cannot read data blob for %s", one->path);
1753 prep_temp_blob(temp, one->data, one->size,
1754 one->sha1, one->mode);
1755 }
1756 }
1757
1758 static void remove_tempfile(void)
1759 {
1760 int i;
1761
1762 for (i = 0; i < 2; i++)
1763 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1764 unlink(diff_temp[i].name);
1765 diff_temp[i].name = NULL;
1766 }
1767 }
1768
1769 static void remove_tempfile_on_signal(int signo)
1770 {
1771 remove_tempfile();
1772 signal(SIGINT, SIG_DFL);
1773 raise(signo);
1774 }
1775
1776 /* An external diff command takes:
1777 *
1778 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1779 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1780 *
1781 */
1782 static void run_external_diff(const char *pgm,
1783 const char *name,
1784 const char *other,
1785 struct diff_filespec *one,
1786 struct diff_filespec *two,
1787 const char *xfrm_msg,
1788 int complete_rewrite)
1789 {
1790 const char *spawn_arg[10];
1791 struct diff_tempfile *temp = diff_temp;
1792 int retval;
1793 static int atexit_asked = 0;
1794 const char *othername;
1795 const char **arg = &spawn_arg[0];
1796
1797 othername = (other? other : name);
1798 if (one && two) {
1799 prepare_temp_file(name, &temp[0], one);
1800 prepare_temp_file(othername, &temp[1], two);
1801 if (! atexit_asked &&
1802 (temp[0].name == temp[0].tmp_path ||
1803 temp[1].name == temp[1].tmp_path)) {
1804 atexit_asked = 1;
1805 atexit(remove_tempfile);
1806 }
1807 signal(SIGINT, remove_tempfile_on_signal);
1808 }
1809
1810 if (one && two) {
1811 *arg++ = pgm;
1812 *arg++ = name;
1813 *arg++ = temp[0].name;
1814 *arg++ = temp[0].hex;
1815 *arg++ = temp[0].mode;
1816 *arg++ = temp[1].name;
1817 *arg++ = temp[1].hex;
1818 *arg++ = temp[1].mode;
1819 if (other) {
1820 *arg++ = other;
1821 *arg++ = xfrm_msg;
1822 }
1823 } else {
1824 *arg++ = pgm;
1825 *arg++ = name;
1826 }
1827 *arg = NULL;
1828 fflush(NULL);
1829 retval = run_command_v_opt(spawn_arg, 0);
1830 remove_tempfile();
1831 if (retval) {
1832 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1833 exit(1);
1834 }
1835 }
1836
1837 static const char *external_diff_attr(const char *name)
1838 {
1839 struct git_attr_check attr_diff_check;
1840
1841 setup_diff_attr_check(&attr_diff_check);
1842 if (!git_checkattr(name, 1, &attr_diff_check)) {
1843 const char *value = attr_diff_check.value;
1844 if (!ATTR_TRUE(value) &&
1845 !ATTR_FALSE(value) &&
1846 !ATTR_UNSET(value)) {
1847 struct ll_diff_driver *drv;
1848
1849 for (drv = user_diff; drv; drv = drv->next)
1850 if (!strcmp(drv->name, value))
1851 return drv->cmd;
1852 }
1853 }
1854 return NULL;
1855 }
1856
1857 static void run_diff_cmd(const char *pgm,
1858 const char *name,
1859 const char *other,
1860 struct diff_filespec *one,
1861 struct diff_filespec *two,
1862 const char *xfrm_msg,
1863 struct diff_options *o,
1864 int complete_rewrite)
1865 {
1866 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
1867 pgm = NULL;
1868 else {
1869 const char *cmd = external_diff_attr(name);
1870 if (cmd)
1871 pgm = cmd;
1872 }
1873
1874 if (pgm) {
1875 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1876 complete_rewrite);
1877 return;
1878 }
1879 if (one && two)
1880 builtin_diff(name, other ? other : name,
1881 one, two, xfrm_msg, o, complete_rewrite);
1882 else
1883 printf("* Unmerged path %s\n", name);
1884 }
1885
1886 static void diff_fill_sha1_info(struct diff_filespec *one)
1887 {
1888 if (DIFF_FILE_VALID(one)) {
1889 if (!one->sha1_valid) {
1890 struct stat st;
1891 if (!strcmp(one->path, "-")) {
1892 hashcpy(one->sha1, null_sha1);
1893 return;
1894 }
1895 if (lstat(one->path, &st) < 0)
1896 die("stat %s", one->path);
1897 if (index_path(one->sha1, one->path, &st, 0))
1898 die("cannot hash %s\n", one->path);
1899 }
1900 }
1901 else
1902 hashclr(one->sha1);
1903 }
1904
1905 static int similarity_index(struct diff_filepair *p)
1906 {
1907 return p->score * 100 / MAX_SCORE;
1908 }
1909
1910 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1911 {
1912 const char *pgm = external_diff();
1913 struct strbuf msg;
1914 char *xfrm_msg;
1915 struct diff_filespec *one = p->one;
1916 struct diff_filespec *two = p->two;
1917 const char *name;
1918 const char *other;
1919 int complete_rewrite = 0;
1920
1921
1922 if (DIFF_PAIR_UNMERGED(p)) {
1923 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1924 return;
1925 }
1926
1927 name = p->one->path;
1928 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1929 diff_fill_sha1_info(one);
1930 diff_fill_sha1_info(two);
1931
1932 strbuf_init(&msg, PATH_MAX * 2 + 300);
1933 switch (p->status) {
1934 case DIFF_STATUS_COPIED:
1935 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1936 strbuf_addstr(&msg, "\ncopy from ");
1937 quote_c_style(name, &msg, NULL, 0);
1938 strbuf_addstr(&msg, "\ncopy to ");
1939 quote_c_style(other, &msg, NULL, 0);
1940 strbuf_addch(&msg, '\n');
1941 break;
1942 case DIFF_STATUS_RENAMED:
1943 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1944 strbuf_addstr(&msg, "\nrename from ");
1945 quote_c_style(name, &msg, NULL, 0);
1946 strbuf_addstr(&msg, "\nrename to ");
1947 quote_c_style(other, &msg, NULL, 0);
1948 strbuf_addch(&msg, '\n');
1949 break;
1950 case DIFF_STATUS_MODIFIED:
1951 if (p->score) {
1952 strbuf_addf(&msg, "dissimilarity index %d%%\n",
1953 similarity_index(p));
1954 complete_rewrite = 1;
1955 break;
1956 }
1957 /* fallthru */
1958 default:
1959 /* nothing */
1960 ;
1961 }
1962
1963 if (hashcmp(one->sha1, two->sha1)) {
1964 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
1965
1966 if (DIFF_OPT_TST(o, BINARY)) {
1967 mmfile_t mf;
1968 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
1969 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
1970 abbrev = 40;
1971 }
1972 strbuf_addf(&msg, "index %.*s..%.*s",
1973 abbrev, sha1_to_hex(one->sha1),
1974 abbrev, sha1_to_hex(two->sha1));
1975 if (one->mode == two->mode)
1976 strbuf_addf(&msg, " %06o", one->mode);
1977 strbuf_addch(&msg, '\n');
1978 }
1979
1980 if (msg.len)
1981 strbuf_setlen(&msg, msg.len - 1);
1982 xfrm_msg = msg.len ? msg.buf : NULL;
1983
1984 if (!pgm &&
1985 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1986 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1987 /* a filepair that changes between file and symlink
1988 * needs to be split into deletion and creation.
1989 */
1990 struct diff_filespec *null = alloc_filespec(two->path);
1991 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1992 free(null);
1993 null = alloc_filespec(one->path);
1994 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1995 free(null);
1996 }
1997 else
1998 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1999 complete_rewrite);
2000
2001 strbuf_release(&msg);
2002 }
2003
2004 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2005 struct diffstat_t *diffstat)
2006 {
2007 const char *name;
2008 const char *other;
2009 int complete_rewrite = 0;
2010
2011 if (DIFF_PAIR_UNMERGED(p)) {
2012 /* unmerged */
2013 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2014 return;
2015 }
2016
2017 name = p->one->path;
2018 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2019
2020 diff_fill_sha1_info(p->one);
2021 diff_fill_sha1_info(p->two);
2022
2023 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2024 complete_rewrite = 1;
2025 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2026 }
2027
2028 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2029 {
2030 const char *name;
2031 const char *other;
2032
2033 if (DIFF_PAIR_UNMERGED(p)) {
2034 /* unmerged */
2035 return;
2036 }
2037
2038 name = p->one->path;
2039 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2040
2041 diff_fill_sha1_info(p->one);
2042 diff_fill_sha1_info(p->two);
2043
2044 builtin_checkdiff(name, other, p->one, p->two, o);
2045 }
2046
2047 void diff_setup(struct diff_options *options)
2048 {
2049 memset(options, 0, sizeof(*options));
2050 options->line_termination = '\n';
2051 options->break_opt = -1;
2052 options->rename_limit = -1;
2053 options->context = 3;
2054 options->msg_sep = "";
2055
2056 options->change = diff_change;
2057 options->add_remove = diff_addremove;
2058 if (diff_use_color_default)
2059 DIFF_OPT_SET(options, COLOR_DIFF);
2060 else
2061 DIFF_OPT_CLR(options, COLOR_DIFF);
2062 options->detect_rename = diff_detect_rename_default;
2063
2064 options->a_prefix = "a/";
2065 options->b_prefix = "b/";
2066 }
2067
2068 int diff_setup_done(struct diff_options *options)
2069 {
2070 int count = 0;
2071
2072 if (options->output_format & DIFF_FORMAT_NAME)
2073 count++;
2074 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2075 count++;
2076 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2077 count++;
2078 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2079 count++;
2080 if (count > 1)
2081 die("--name-only, --name-status, --check and -s are mutually exclusive");
2082
2083 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2084 options->detect_rename = DIFF_DETECT_COPY;
2085
2086 if (options->output_format & (DIFF_FORMAT_NAME |
2087 DIFF_FORMAT_NAME_STATUS |
2088 DIFF_FORMAT_CHECKDIFF |
2089 DIFF_FORMAT_NO_OUTPUT))
2090 options->output_format &= ~(DIFF_FORMAT_RAW |
2091 DIFF_FORMAT_NUMSTAT |
2092 DIFF_FORMAT_DIFFSTAT |
2093 DIFF_FORMAT_SHORTSTAT |
2094 DIFF_FORMAT_SUMMARY |
2095 DIFF_FORMAT_PATCH);
2096
2097 /*
2098 * These cases always need recursive; we do not drop caller-supplied
2099 * recursive bits for other formats here.
2100 */
2101 if (options->output_format & (DIFF_FORMAT_PATCH |
2102 DIFF_FORMAT_NUMSTAT |
2103 DIFF_FORMAT_DIFFSTAT |
2104 DIFF_FORMAT_SHORTSTAT |
2105 DIFF_FORMAT_SUMMARY |
2106 DIFF_FORMAT_CHECKDIFF))
2107 DIFF_OPT_SET(options, RECURSIVE);
2108 /*
2109 * Also pickaxe would not work very well if you do not say recursive
2110 */
2111 if (options->pickaxe)
2112 DIFF_OPT_SET(options, RECURSIVE);
2113
2114 if (options->detect_rename && options->rename_limit < 0)
2115 options->rename_limit = diff_rename_limit_default;
2116 if (options->setup & DIFF_SETUP_USE_CACHE) {
2117 if (!active_cache)
2118 /* read-cache does not die even when it fails
2119 * so it is safe for us to do this here. Also
2120 * it does not smudge active_cache or active_nr
2121 * when it fails, so we do not have to worry about
2122 * cleaning it up ourselves either.
2123 */
2124 read_cache();
2125 }
2126 if (options->abbrev <= 0 || 40 < options->abbrev)
2127 options->abbrev = 40; /* full */
2128
2129 /*
2130 * It does not make sense to show the first hit we happened
2131 * to have found. It does not make sense not to return with
2132 * exit code in such a case either.
2133 */
2134 if (DIFF_OPT_TST(options, QUIET)) {
2135 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2136 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2137 }
2138
2139 /*
2140 * If we postprocess in diffcore, we cannot simply return
2141 * upon the first hit. We need to run diff as usual.
2142 */
2143 if (options->pickaxe || options->filter)
2144 DIFF_OPT_CLR(options, QUIET);
2145
2146 return 0;
2147 }
2148
2149 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2150 {
2151 char c, *eq;
2152 int len;
2153
2154 if (*arg != '-')
2155 return 0;
2156 c = *++arg;
2157 if (!c)
2158 return 0;
2159 if (c == arg_short) {
2160 c = *++arg;
2161 if (!c)
2162 return 1;
2163 if (val && isdigit(c)) {
2164 char *end;
2165 int n = strtoul(arg, &end, 10);
2166 if (*end)
2167 return 0;
2168 *val = n;
2169 return 1;
2170 }
2171 return 0;
2172 }
2173 if (c != '-')
2174 return 0;
2175 arg++;
2176 eq = strchr(arg, '=');
2177 if (eq)
2178 len = eq - arg;
2179 else
2180 len = strlen(arg);
2181 if (!len || strncmp(arg, arg_long, len))
2182 return 0;
2183 if (eq) {
2184 int n;
2185 char *end;
2186 if (!isdigit(*++eq))
2187 return 0;
2188 n = strtoul(eq, &end, 10);
2189 if (*end)
2190 return 0;
2191 *val = n;
2192 }
2193 return 1;
2194 }
2195
2196 static int diff_scoreopt_parse(const char *opt);
2197
2198 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2199 {
2200 const char *arg = av[0];
2201
2202 /* Output format options */
2203 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2204 options->output_format |= DIFF_FORMAT_PATCH;
2205 else if (opt_arg(arg, 'U', "unified", &options->context))
2206 options->output_format |= DIFF_FORMAT_PATCH;
2207 else if (!strcmp(arg, "--raw"))
2208 options->output_format |= DIFF_FORMAT_RAW;
2209 else if (!strcmp(arg, "--patch-with-raw"))
2210 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2211 else if (!strcmp(arg, "--numstat"))
2212 options->output_format |= DIFF_FORMAT_NUMSTAT;
2213 else if (!strcmp(arg, "--shortstat"))
2214 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2215 else if (!strcmp(arg, "--check"))
2216 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2217 else if (!strcmp(arg, "--summary"))
2218 options->output_format |= DIFF_FORMAT_SUMMARY;
2219 else if (!strcmp(arg, "--patch-with-stat"))
2220 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2221 else if (!strcmp(arg, "--name-only"))
2222 options->output_format |= DIFF_FORMAT_NAME;
2223 else if (!strcmp(arg, "--name-status"))
2224 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2225 else if (!strcmp(arg, "-s"))
2226 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2227 else if (!prefixcmp(arg, "--stat")) {
2228 char *end;
2229 int width = options->stat_width;
2230 int name_width = options->stat_name_width;
2231 arg += 6;
2232 end = (char *)arg;
2233
2234 switch (*arg) {
2235 case '-':
2236 if (!prefixcmp(arg, "-width="))
2237 width = strtoul(arg + 7, &end, 10);
2238 else if (!prefixcmp(arg, "-name-width="))
2239 name_width = strtoul(arg + 12, &end, 10);
2240 break;
2241 case '=':
2242 width = strtoul(arg+1, &end, 10);
2243 if (*end == ',')
2244 name_width = strtoul(end+1, &end, 10);
2245 }
2246
2247 /* Important! This checks all the error cases! */
2248 if (*end)
2249 return 0;
2250 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2251 options->stat_name_width = name_width;
2252 options->stat_width = width;
2253 }
2254
2255 /* renames options */
2256 else if (!prefixcmp(arg, "-B")) {
2257 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2258 return -1;
2259 }
2260 else if (!prefixcmp(arg, "-M")) {
2261 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2262 return -1;
2263 options->detect_rename = DIFF_DETECT_RENAME;
2264 }
2265 else if (!prefixcmp(arg, "-C")) {
2266 if (options->detect_rename == DIFF_DETECT_COPY)
2267 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2268 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2269 return -1;
2270 options->detect_rename = DIFF_DETECT_COPY;
2271 }
2272 else if (!strcmp(arg, "--no-renames"))
2273 options->detect_rename = 0;
2274
2275 /* xdiff options */
2276 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2277 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2278 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2279 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2280 else if (!strcmp(arg, "--ignore-space-at-eol"))
2281 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2282
2283 /* flags options */
2284 else if (!strcmp(arg, "--binary")) {
2285 options->output_format |= DIFF_FORMAT_PATCH;
2286 DIFF_OPT_SET(options, BINARY);
2287 }
2288 else if (!strcmp(arg, "--full-index"))
2289 DIFF_OPT_SET(options, FULL_INDEX);
2290 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2291 DIFF_OPT_SET(options, TEXT);
2292 else if (!strcmp(arg, "-R"))
2293 DIFF_OPT_SET(options, REVERSE_DIFF);
2294 else if (!strcmp(arg, "--find-copies-harder"))
2295 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2296 else if (!strcmp(arg, "--follow"))
2297 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2298 else if (!strcmp(arg, "--color"))
2299 DIFF_OPT_SET(options, COLOR_DIFF);
2300 else if (!strcmp(arg, "--no-color"))
2301 DIFF_OPT_CLR(options, COLOR_DIFF);
2302 else if (!strcmp(arg, "--color-words"))
2303 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2304 else if (!strcmp(arg, "--exit-code"))
2305 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2306 else if (!strcmp(arg, "--quiet"))
2307 DIFF_OPT_SET(options, QUIET);
2308 else if (!strcmp(arg, "--ext-diff"))
2309 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2310 else if (!strcmp(arg, "--no-ext-diff"))
2311 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2312
2313 /* misc options */
2314 else if (!strcmp(arg, "-z"))
2315 options->line_termination = 0;
2316 else if (!prefixcmp(arg, "-l"))
2317 options->rename_limit = strtoul(arg+2, NULL, 10);
2318 else if (!prefixcmp(arg, "-S"))
2319 options->pickaxe = arg + 2;
2320 else if (!strcmp(arg, "--pickaxe-all"))
2321 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2322 else if (!strcmp(arg, "--pickaxe-regex"))
2323 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2324 else if (!prefixcmp(arg, "-O"))
2325 options->orderfile = arg + 2;
2326 else if (!prefixcmp(arg, "--diff-filter="))
2327 options->filter = arg + 14;
2328 else if (!strcmp(arg, "--abbrev"))
2329 options->abbrev = DEFAULT_ABBREV;
2330 else if (!prefixcmp(arg, "--abbrev=")) {
2331 options->abbrev = strtoul(arg + 9, NULL, 10);
2332 if (options->abbrev < MINIMUM_ABBREV)
2333 options->abbrev = MINIMUM_ABBREV;
2334 else if (40 < options->abbrev)
2335 options->abbrev = 40;
2336 }
2337 else if (!prefixcmp(arg, "--src-prefix="))
2338 options->a_prefix = arg + 13;
2339 else if (!prefixcmp(arg, "--dst-prefix="))
2340 options->b_prefix = arg + 13;
2341 else if (!strcmp(arg, "--no-prefix"))
2342 options->a_prefix = options->b_prefix = "";
2343 else
2344 return 0;
2345 return 1;
2346 }
2347
2348 static int parse_num(const char **cp_p)
2349 {
2350 unsigned long num, scale;
2351 int ch, dot;
2352 const char *cp = *cp_p;
2353
2354 num = 0;
2355 scale = 1;
2356 dot = 0;
2357 for(;;) {
2358 ch = *cp;
2359 if ( !dot && ch == '.' ) {
2360 scale = 1;
2361 dot = 1;
2362 } else if ( ch == '%' ) {
2363 scale = dot ? scale*100 : 100;
2364 cp++; /* % is always at the end */
2365 break;
2366 } else if ( ch >= '0' && ch <= '9' ) {
2367 if ( scale < 100000 ) {
2368 scale *= 10;
2369 num = (num*10) + (ch-'0');
2370 }
2371 } else {
2372 break;
2373 }
2374 cp++;
2375 }
2376 *cp_p = cp;
2377
2378 /* user says num divided by scale and we say internally that
2379 * is MAX_SCORE * num / scale.
2380 */
2381 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2382 }
2383
2384 static int diff_scoreopt_parse(const char *opt)
2385 {
2386 int opt1, opt2, cmd;
2387
2388 if (*opt++ != '-')
2389 return -1;
2390 cmd = *opt++;
2391 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2392 return -1; /* that is not a -M, -C nor -B option */
2393
2394 opt1 = parse_num(&opt);
2395 if (cmd != 'B')
2396 opt2 = 0;
2397 else {
2398 if (*opt == 0)
2399 opt2 = 0;
2400 else if (*opt != '/')
2401 return -1; /* we expect -B80/99 or -B80 */
2402 else {
2403 opt++;
2404 opt2 = parse_num(&opt);
2405 }
2406 }
2407 if (*opt != 0)
2408 return -1;
2409 return opt1 | (opt2 << 16);
2410 }
2411
2412 struct diff_queue_struct diff_queued_diff;
2413
2414 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2415 {
2416 if (queue->alloc <= queue->nr) {
2417 queue->alloc = alloc_nr(queue->alloc);
2418 queue->queue = xrealloc(queue->queue,
2419 sizeof(dp) * queue->alloc);
2420 }
2421 queue->queue[queue->nr++] = dp;
2422 }
2423
2424 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2425 struct diff_filespec *one,
2426 struct diff_filespec *two)
2427 {
2428 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2429 dp->one = one;
2430 dp->two = two;
2431 if (queue)
2432 diff_q(queue, dp);
2433 return dp;
2434 }
2435
2436 void diff_free_filepair(struct diff_filepair *p)
2437 {
2438 free_filespec(p->one);
2439 free_filespec(p->two);
2440 free(p);
2441 }
2442
2443 /* This is different from find_unique_abbrev() in that
2444 * it stuffs the result with dots for alignment.
2445 */
2446 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2447 {
2448 int abblen;
2449 const char *abbrev;
2450 if (len == 40)
2451 return sha1_to_hex(sha1);
2452
2453 abbrev = find_unique_abbrev(sha1, len);
2454 if (!abbrev)
2455 return sha1_to_hex(sha1);
2456 abblen = strlen(abbrev);
2457 if (abblen < 37) {
2458 static char hex[41];
2459 if (len < abblen && abblen <= len + 2)
2460 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2461 else
2462 sprintf(hex, "%s...", abbrev);
2463 return hex;
2464 }
2465 return sha1_to_hex(sha1);
2466 }
2467
2468 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2469 {
2470 int line_termination = opt->line_termination;
2471 int inter_name_termination = line_termination ? '\t' : '\0';
2472
2473 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2474 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2475 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2476 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2477 }
2478 if (p->score) {
2479 printf("%c%03d%c", p->status, similarity_index(p),
2480 inter_name_termination);
2481 } else {
2482 printf("%c%c", p->status, inter_name_termination);
2483 }
2484
2485 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2486 write_name_quoted(p->one->path, stdout, inter_name_termination);
2487 write_name_quoted(p->two->path, stdout, line_termination);
2488 } else {
2489 const char *path = p->one->mode ? p->one->path : p->two->path;
2490 write_name_quoted(path, stdout, line_termination);
2491 }
2492 }
2493
2494 int diff_unmodified_pair(struct diff_filepair *p)
2495 {
2496 /* This function is written stricter than necessary to support
2497 * the currently implemented transformers, but the idea is to
2498 * let transformers to produce diff_filepairs any way they want,
2499 * and filter and clean them up here before producing the output.
2500 */
2501 struct diff_filespec *one = p->one, *two = p->two;
2502
2503 if (DIFF_PAIR_UNMERGED(p))
2504 return 0; /* unmerged is interesting */
2505
2506 /* deletion, addition, mode or type change
2507 * and rename are all interesting.
2508 */
2509 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2510 DIFF_PAIR_MODE_CHANGED(p) ||
2511 strcmp(one->path, two->path))
2512 return 0;
2513
2514 /* both are valid and point at the same path. that is, we are
2515 * dealing with a change.
2516 */
2517 if (one->sha1_valid && two->sha1_valid &&
2518 !hashcmp(one->sha1, two->sha1))
2519 return 1; /* no change */
2520 if (!one->sha1_valid && !two->sha1_valid)
2521 return 1; /* both look at the same file on the filesystem. */
2522 return 0;
2523 }
2524
2525 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2526 {
2527 if (diff_unmodified_pair(p))
2528 return;
2529
2530 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2531 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2532 return; /* no tree diffs in patch format */
2533
2534 run_diff(p, o);
2535 }
2536
2537 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2538 struct diffstat_t *diffstat)
2539 {
2540 if (diff_unmodified_pair(p))
2541 return;
2542
2543 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2544 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2545 return; /* no tree diffs in patch format */
2546
2547 run_diffstat(p, o, diffstat);
2548 }
2549
2550 static void diff_flush_checkdiff(struct diff_filepair *p,
2551 struct diff_options *o)
2552 {
2553 if (diff_unmodified_pair(p))
2554 return;
2555
2556 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2557 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2558 return; /* no tree diffs in patch format */
2559
2560 run_checkdiff(p, o);
2561 }
2562
2563 int diff_queue_is_empty(void)
2564 {
2565 struct diff_queue_struct *q = &diff_queued_diff;
2566 int i;
2567 for (i = 0; i < q->nr; i++)
2568 if (!diff_unmodified_pair(q->queue[i]))
2569 return 0;
2570 return 1;
2571 }
2572
2573 #if DIFF_DEBUG
2574 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2575 {
2576 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2577 x, one ? one : "",
2578 s->path,
2579 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2580 s->mode,
2581 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2582 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2583 x, one ? one : "",
2584 s->size, s->xfrm_flags);
2585 }
2586
2587 void diff_debug_filepair(const struct diff_filepair *p, int i)
2588 {
2589 diff_debug_filespec(p->one, i, "one");
2590 diff_debug_filespec(p->two, i, "two");
2591 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2592 p->score, p->status ? p->status : '?',
2593 p->one->rename_used, p->broken_pair);
2594 }
2595
2596 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2597 {
2598 int i;
2599 if (msg)
2600 fprintf(stderr, "%s\n", msg);
2601 fprintf(stderr, "q->nr = %d\n", q->nr);
2602 for (i = 0; i < q->nr; i++) {
2603 struct diff_filepair *p = q->queue[i];
2604 diff_debug_filepair(p, i);
2605 }
2606 }
2607 #endif
2608
2609 static void diff_resolve_rename_copy(void)
2610 {
2611 int i;
2612 struct diff_filepair *p;
2613 struct diff_queue_struct *q = &diff_queued_diff;
2614
2615 diff_debug_queue("resolve-rename-copy", q);
2616
2617 for (i = 0; i < q->nr; i++) {
2618 p = q->queue[i];
2619 p->status = 0; /* undecided */
2620 if (DIFF_PAIR_UNMERGED(p))
2621 p->status = DIFF_STATUS_UNMERGED;
2622 else if (!DIFF_FILE_VALID(p->one))
2623 p->status = DIFF_STATUS_ADDED;
2624 else if (!DIFF_FILE_VALID(p->two))
2625 p->status = DIFF_STATUS_DELETED;
2626 else if (DIFF_PAIR_TYPE_CHANGED(p))
2627 p->status = DIFF_STATUS_TYPE_CHANGED;
2628
2629 /* from this point on, we are dealing with a pair
2630 * whose both sides are valid and of the same type, i.e.
2631 * either in-place edit or rename/copy edit.
2632 */
2633 else if (DIFF_PAIR_RENAME(p)) {
2634 /*
2635 * A rename might have re-connected a broken
2636 * pair up, causing the pathnames to be the
2637 * same again. If so, that's not a rename at
2638 * all, just a modification..
2639 *
2640 * Otherwise, see if this source was used for
2641 * multiple renames, in which case we decrement
2642 * the count, and call it a copy.
2643 */
2644 if (!strcmp(p->one->path, p->two->path))
2645 p->status = DIFF_STATUS_MODIFIED;
2646 else if (--p->one->rename_used > 0)
2647 p->status = DIFF_STATUS_COPIED;
2648 else
2649 p->status = DIFF_STATUS_RENAMED;
2650 }
2651 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2652 p->one->mode != p->two->mode ||
2653 is_null_sha1(p->one->sha1))
2654 p->status = DIFF_STATUS_MODIFIED;
2655 else {
2656 /* This is a "no-change" entry and should not
2657 * happen anymore, but prepare for broken callers.
2658 */
2659 error("feeding unmodified %s to diffcore",
2660 p->one->path);
2661 p->status = DIFF_STATUS_UNKNOWN;
2662 }
2663 }
2664 diff_debug_queue("resolve-rename-copy done", q);
2665 }
2666
2667 static int check_pair_status(struct diff_filepair *p)
2668 {
2669 switch (p->status) {
2670 case DIFF_STATUS_UNKNOWN:
2671 return 0;
2672 case 0:
2673 die("internal error in diff-resolve-rename-copy");
2674 default:
2675 return 1;
2676 }
2677 }
2678
2679 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2680 {
2681 int fmt = opt->output_format;
2682
2683 if (fmt & DIFF_FORMAT_CHECKDIFF)
2684 diff_flush_checkdiff(p, opt);
2685 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2686 diff_flush_raw(p, opt);
2687 else if (fmt & DIFF_FORMAT_NAME)
2688 write_name_quoted(p->two->path, stdout, opt->line_termination);
2689 }
2690
2691 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2692 {
2693 if (fs->mode)
2694 printf(" %s mode %06o ", newdelete, fs->mode);
2695 else
2696 printf(" %s ", newdelete);
2697 write_name_quoted(fs->path, stdout, '\n');
2698 }
2699
2700
2701 static void show_mode_change(struct diff_filepair *p, int show_name)
2702 {
2703 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2704 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2705 show_name ? ' ' : '\n');
2706 if (show_name) {
2707 write_name_quoted(p->two->path, stdout, '\n');
2708 }
2709 }
2710 }
2711
2712 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2713 {
2714 char *names = pprint_rename(p->one->path, p->two->path);
2715
2716 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2717 free(names);
2718 show_mode_change(p, 0);
2719 }
2720
2721 static void diff_summary(struct diff_filepair *p)
2722 {
2723 switch(p->status) {
2724 case DIFF_STATUS_DELETED:
2725 show_file_mode_name("delete", p->one);
2726 break;
2727 case DIFF_STATUS_ADDED:
2728 show_file_mode_name("create", p->two);
2729 break;
2730 case DIFF_STATUS_COPIED:
2731 show_rename_copy("copy", p);
2732 break;
2733 case DIFF_STATUS_RENAMED:
2734 show_rename_copy("rename", p);
2735 break;
2736 default:
2737 if (p->score) {
2738 fputs(" rewrite ", stdout);
2739 write_name_quoted(p->two->path, stdout, ' ');
2740 printf("(%d%%)\n", similarity_index(p));
2741 }
2742 show_mode_change(p, !p->score);
2743 break;
2744 }
2745 }
2746
2747 struct patch_id_t {
2748 struct xdiff_emit_state xm;
2749 SHA_CTX *ctx;
2750 int patchlen;
2751 };
2752
2753 static int remove_space(char *line, int len)
2754 {
2755 int i;
2756 char *dst = line;
2757 unsigned char c;
2758
2759 for (i = 0; i < len; i++)
2760 if (!isspace((c = line[i])))
2761 *dst++ = c;
2762
2763 return dst - line;
2764 }
2765
2766 static void patch_id_consume(void *priv, char *line, unsigned long len)
2767 {
2768 struct patch_id_t *data = priv;
2769 int new_len;
2770
2771 /* Ignore line numbers when computing the SHA1 of the patch */
2772 if (!prefixcmp(line, "@@ -"))
2773 return;
2774
2775 new_len = remove_space(line, len);
2776
2777 SHA1_Update(data->ctx, line, new_len);
2778 data->patchlen += new_len;
2779 }
2780
2781 /* returns 0 upon success, and writes result into sha1 */
2782 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2783 {
2784 struct diff_queue_struct *q = &diff_queued_diff;
2785 int i;
2786 SHA_CTX ctx;
2787 struct patch_id_t data;
2788 char buffer[PATH_MAX * 4 + 20];
2789
2790 SHA1_Init(&ctx);
2791 memset(&data, 0, sizeof(struct patch_id_t));
2792 data.ctx = &ctx;
2793 data.xm.consume = patch_id_consume;
2794
2795 for (i = 0; i < q->nr; i++) {
2796 xpparam_t xpp;
2797 xdemitconf_t xecfg;
2798 xdemitcb_t ecb;
2799 mmfile_t mf1, mf2;
2800 struct diff_filepair *p = q->queue[i];
2801 int len1, len2;
2802
2803 memset(&xecfg, 0, sizeof(xecfg));
2804 if (p->status == 0)
2805 return error("internal diff status error");
2806 if (p->status == DIFF_STATUS_UNKNOWN)
2807 continue;
2808 if (diff_unmodified_pair(p))
2809 continue;
2810 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2811 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2812 continue;
2813 if (DIFF_PAIR_UNMERGED(p))
2814 continue;
2815
2816 diff_fill_sha1_info(p->one);
2817 diff_fill_sha1_info(p->two);
2818 if (fill_mmfile(&mf1, p->one) < 0 ||
2819 fill_mmfile(&mf2, p->two) < 0)
2820 return error("unable to read files to diff");
2821
2822 len1 = remove_space(p->one->path, strlen(p->one->path));
2823 len2 = remove_space(p->two->path, strlen(p->two->path));
2824 if (p->one->mode == 0)
2825 len1 = snprintf(buffer, sizeof(buffer),
2826 "diff--gita/%.*sb/%.*s"
2827 "newfilemode%06o"
2828 "---/dev/null"
2829 "+++b/%.*s",
2830 len1, p->one->path,
2831 len2, p->two->path,
2832 p->two->mode,
2833 len2, p->two->path);
2834 else if (p->two->mode == 0)
2835 len1 = snprintf(buffer, sizeof(buffer),
2836 "diff--gita/%.*sb/%.*s"
2837 "deletedfilemode%06o"
2838 "---a/%.*s"
2839 "+++/dev/null",
2840 len1, p->one->path,
2841 len2, p->two->path,
2842 p->one->mode,
2843 len1, p->one->path);
2844 else
2845 len1 = snprintf(buffer, sizeof(buffer),
2846 "diff--gita/%.*sb/%.*s"
2847 "---a/%.*s"
2848 "+++b/%.*s",
2849 len1, p->one->path,
2850 len2, p->two->path,
2851 len1, p->one->path,
2852 len2, p->two->path);
2853 SHA1_Update(&ctx, buffer, len1);
2854
2855 xpp.flags = XDF_NEED_MINIMAL;
2856 xecfg.ctxlen = 3;
2857 xecfg.flags = XDL_EMIT_FUNCNAMES;
2858 ecb.outf = xdiff_outf;
2859 ecb.priv = &data;
2860 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2861 }
2862
2863 SHA1_Final(sha1, &ctx);
2864 return 0;
2865 }
2866
2867 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2868 {
2869 struct diff_queue_struct *q = &diff_queued_diff;
2870 int i;
2871 int result = diff_get_patch_id(options, sha1);
2872
2873 for (i = 0; i < q->nr; i++)
2874 diff_free_filepair(q->queue[i]);
2875
2876 free(q->queue);
2877 q->queue = NULL;
2878 q->nr = q->alloc = 0;
2879
2880 return result;
2881 }
2882
2883 static int is_summary_empty(const struct diff_queue_struct *q)
2884 {
2885 int i;
2886
2887 for (i = 0; i < q->nr; i++) {
2888 const struct diff_filepair *p = q->queue[i];
2889
2890 switch (p->status) {
2891 case DIFF_STATUS_DELETED:
2892 case DIFF_STATUS_ADDED:
2893 case DIFF_STATUS_COPIED:
2894 case DIFF_STATUS_RENAMED:
2895 return 0;
2896 default:
2897 if (p->score)
2898 return 0;
2899 if (p->one->mode && p->two->mode &&
2900 p->one->mode != p->two->mode)
2901 return 0;
2902 break;
2903 }
2904 }
2905 return 1;
2906 }
2907
2908 void diff_flush(struct diff_options *options)
2909 {
2910 struct diff_queue_struct *q = &diff_queued_diff;
2911 int i, output_format = options->output_format;
2912 int separator = 0;
2913
2914 /*
2915 * Order: raw, stat, summary, patch
2916 * or: name/name-status/checkdiff (other bits clear)
2917 */
2918 if (!q->nr)
2919 goto free_queue;
2920
2921 if (output_format & (DIFF_FORMAT_RAW |
2922 DIFF_FORMAT_NAME |
2923 DIFF_FORMAT_NAME_STATUS |
2924 DIFF_FORMAT_CHECKDIFF)) {
2925 for (i = 0; i < q->nr; i++) {
2926 struct diff_filepair *p = q->queue[i];
2927 if (check_pair_status(p))
2928 flush_one_pair(p, options);
2929 }
2930 separator++;
2931 }
2932
2933 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2934 struct diffstat_t diffstat;
2935
2936 memset(&diffstat, 0, sizeof(struct diffstat_t));
2937 diffstat.xm.consume = diffstat_consume;
2938 for (i = 0; i < q->nr; i++) {
2939 struct diff_filepair *p = q->queue[i];
2940 if (check_pair_status(p))
2941 diff_flush_stat(p, options, &diffstat);
2942 }
2943 if (output_format & DIFF_FORMAT_NUMSTAT)
2944 show_numstat(&diffstat, options);
2945 if (output_format & DIFF_FORMAT_DIFFSTAT)
2946 show_stats(&diffstat, options);
2947 if (output_format & DIFF_FORMAT_SHORTSTAT)
2948 show_shortstats(&diffstat);
2949 free_diffstat_info(&diffstat);
2950 separator++;
2951 }
2952
2953 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2954 for (i = 0; i < q->nr; i++)
2955 diff_summary(q->queue[i]);
2956 separator++;
2957 }
2958
2959 if (output_format & DIFF_FORMAT_PATCH) {
2960 if (separator) {
2961 if (options->stat_sep) {
2962 /* attach patch instead of inline */
2963 fputs(options->stat_sep, stdout);
2964 } else {
2965 putchar(options->line_termination);
2966 }
2967 }
2968
2969 for (i = 0; i < q->nr; i++) {
2970 struct diff_filepair *p = q->queue[i];
2971 if (check_pair_status(p))
2972 diff_flush_patch(p, options);
2973 }
2974 }
2975
2976 if (output_format & DIFF_FORMAT_CALLBACK)
2977 options->format_callback(q, options, options->format_callback_data);
2978
2979 for (i = 0; i < q->nr; i++)
2980 diff_free_filepair(q->queue[i]);
2981 free_queue:
2982 free(q->queue);
2983 q->queue = NULL;
2984 q->nr = q->alloc = 0;
2985 }
2986
2987 static void diffcore_apply_filter(const char *filter)
2988 {
2989 int i;
2990 struct diff_queue_struct *q = &diff_queued_diff;
2991 struct diff_queue_struct outq;
2992 outq.queue = NULL;
2993 outq.nr = outq.alloc = 0;
2994
2995 if (!filter)
2996 return;
2997
2998 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2999 int found;
3000 for (i = found = 0; !found && i < q->nr; i++) {
3001 struct diff_filepair *p = q->queue[i];
3002 if (((p->status == DIFF_STATUS_MODIFIED) &&
3003 ((p->score &&
3004 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3005 (!p->score &&
3006 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3007 ((p->status != DIFF_STATUS_MODIFIED) &&
3008 strchr(filter, p->status)))
3009 found++;
3010 }
3011 if (found)
3012 return;
3013
3014 /* otherwise we will clear the whole queue
3015 * by copying the empty outq at the end of this
3016 * function, but first clear the current entries
3017 * in the queue.
3018 */
3019 for (i = 0; i < q->nr; i++)
3020 diff_free_filepair(q->queue[i]);
3021 }
3022 else {
3023 /* Only the matching ones */
3024 for (i = 0; i < q->nr; i++) {
3025 struct diff_filepair *p = q->queue[i];
3026
3027 if (((p->status == DIFF_STATUS_MODIFIED) &&
3028 ((p->score &&
3029 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3030 (!p->score &&
3031 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3032 ((p->status != DIFF_STATUS_MODIFIED) &&
3033 strchr(filter, p->status)))
3034 diff_q(&outq, p);
3035 else
3036 diff_free_filepair(p);
3037 }
3038 }
3039 free(q->queue);
3040 *q = outq;
3041 }
3042
3043 /* Check whether two filespecs with the same mode and size are identical */
3044 static int diff_filespec_is_identical(struct diff_filespec *one,
3045 struct diff_filespec *two)
3046 {
3047 if (S_ISGITLINK(one->mode)) {
3048 diff_fill_sha1_info(one);
3049 diff_fill_sha1_info(two);
3050 return !hashcmp(one->sha1, two->sha1);
3051 }
3052 if (diff_populate_filespec(one, 0))
3053 return 0;
3054 if (diff_populate_filespec(two, 0))
3055 return 0;
3056 return !memcmp(one->data, two->data, one->size);
3057 }
3058
3059 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3060 {
3061 int i;
3062 struct diff_queue_struct *q = &diff_queued_diff;
3063 struct diff_queue_struct outq;
3064 outq.queue = NULL;
3065 outq.nr = outq.alloc = 0;
3066
3067 for (i = 0; i < q->nr; i++) {
3068 struct diff_filepair *p = q->queue[i];
3069
3070 /*
3071 * 1. Entries that come from stat info dirtyness
3072 * always have both sides (iow, not create/delete),
3073 * one side of the object name is unknown, with
3074 * the same mode and size. Keep the ones that
3075 * do not match these criteria. They have real
3076 * differences.
3077 *
3078 * 2. At this point, the file is known to be modified,
3079 * with the same mode and size, and the object
3080 * name of one side is unknown. Need to inspect
3081 * the identical contents.
3082 */
3083 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3084 !DIFF_FILE_VALID(p->two) ||
3085 (p->one->sha1_valid && p->two->sha1_valid) ||
3086 (p->one->mode != p->two->mode) ||
3087 diff_populate_filespec(p->one, 1) ||
3088 diff_populate_filespec(p->two, 1) ||
3089 (p->one->size != p->two->size) ||
3090 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3091 diff_q(&outq, p);
3092 else {
3093 /*
3094 * The caller can subtract 1 from skip_stat_unmatch
3095 * to determine how many paths were dirty only
3096 * due to stat info mismatch.
3097 */
3098 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3099 diffopt->skip_stat_unmatch++;
3100 diff_free_filepair(p);
3101 }
3102 }
3103 free(q->queue);
3104 *q = outq;
3105 }
3106
3107 void diffcore_std(struct diff_options *options)
3108 {
3109 if (DIFF_OPT_TST(options, QUIET))
3110 return;
3111
3112 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3113 diffcore_skip_stat_unmatch(options);
3114 if (options->break_opt != -1)
3115 diffcore_break(options->break_opt);
3116 if (options->detect_rename)
3117 diffcore_rename(options);
3118 if (options->break_opt != -1)
3119 diffcore_merge_broken();
3120 if (options->pickaxe)
3121 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3122 if (options->orderfile)
3123 diffcore_order(options->orderfile);
3124 diff_resolve_rename_copy();
3125 diffcore_apply_filter(options->filter);
3126
3127 if (diff_queued_diff.nr)
3128 DIFF_OPT_SET(options, HAS_CHANGES);
3129 else
3130 DIFF_OPT_CLR(options, HAS_CHANGES);
3131 }
3132
3133 int diff_result_code(struct diff_options *opt, int status)
3134 {
3135 int result = 0;
3136 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3137 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3138 return status;
3139 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3140 DIFF_OPT_TST(opt, HAS_CHANGES))
3141 result |= 01;
3142 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3143 DIFF_OPT_TST(opt, CHECK_FAILED))
3144 result |= 02;
3145 return result;
3146 }
3147
3148 void diff_addremove(struct diff_options *options,
3149 int addremove, unsigned mode,
3150 const unsigned char *sha1,
3151 const char *base, const char *path)
3152 {
3153 char concatpath[PATH_MAX];
3154 struct diff_filespec *one, *two;
3155
3156 /* This may look odd, but it is a preparation for
3157 * feeding "there are unchanged files which should
3158 * not produce diffs, but when you are doing copy
3159 * detection you would need them, so here they are"
3160 * entries to the diff-core. They will be prefixed
3161 * with something like '=' or '*' (I haven't decided
3162 * which but should not make any difference).
3163 * Feeding the same new and old to diff_change()
3164 * also has the same effect.
3165 * Before the final output happens, they are pruned after
3166 * merged into rename/copy pairs as appropriate.
3167 */
3168 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3169 addremove = (addremove == '+' ? '-' :
3170 addremove == '-' ? '+' : addremove);
3171
3172 if (!path) path = "";
3173 sprintf(concatpath, "%s%s", base, path);
3174 one = alloc_filespec(concatpath);
3175 two = alloc_filespec(concatpath);
3176
3177 if (addremove != '+')
3178 fill_filespec(one, sha1, mode);
3179 if (addremove != '-')
3180 fill_filespec(two, sha1, mode);
3181
3182 diff_queue(&diff_queued_diff, one, two);
3183 DIFF_OPT_SET(options, HAS_CHANGES);
3184 }
3185
3186 void diff_change(struct diff_options *options,
3187 unsigned old_mode, unsigned new_mode,
3188 const unsigned char *old_sha1,
3189 const unsigned char *new_sha1,
3190 const char *base, const char *path)
3191 {
3192 char concatpath[PATH_MAX];
3193 struct diff_filespec *one, *two;
3194
3195 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3196 unsigned tmp;
3197 const unsigned char *tmp_c;
3198 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3199 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3200 }
3201 if (!path) path = "";
3202 sprintf(concatpath, "%s%s", base, path);
3203 one = alloc_filespec(concatpath);
3204 two = alloc_filespec(concatpath);
3205 fill_filespec(one, old_sha1, old_mode);
3206 fill_filespec(two, new_sha1, new_mode);
3207
3208 diff_queue(&diff_queued_diff, one, two);
3209 DIFF_OPT_SET(options, HAS_CHANGES);
3210 }
3211
3212 void diff_unmerge(struct diff_options *options,
3213 const char *path,
3214 unsigned mode, const unsigned char *sha1)
3215 {
3216 struct diff_filespec *one, *two;
3217 one = alloc_filespec(path);
3218 two = alloc_filespec(path);
3219 fill_filespec(one, sha1, mode);
3220 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3221 }
Mstormo's patches to Git