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Add Documentation/CodingGuidelines
[debian-git.git] / diff.c
blob71b340c5368fb287ce7d7b242aa51436ed5dda93
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
13 #ifdef NO_FAST_WORKING_DIRECTORY
14 #define FAST_WORKING_DIRECTORY 0
15 #else
16 #define FAST_WORKING_DIRECTORY 1
17 #endif
18
19 static int diff_detect_rename_default;
20 static int diff_rename_limit_default = 100;
21 static int diff_use_color_default;
22 int diff_auto_refresh_index = 1;
23
24 static char diff_colors[][COLOR_MAXLEN] = {
25 "\033[m", /* reset */
26 "", /* PLAIN (normal) */
27 "\033[1m", /* METAINFO (bold) */
28 "\033[36m", /* FRAGINFO (cyan) */
29 "\033[31m", /* OLD (red) */
30 "\033[32m", /* NEW (green) */
31 "\033[33m", /* COMMIT (yellow) */
32 "\033[41m", /* WHITESPACE (red background) */
33 };
34
35 static int parse_diff_color_slot(const char *var, int ofs)
36 {
37 if (!strcasecmp(var+ofs, "plain"))
38 return DIFF_PLAIN;
39 if (!strcasecmp(var+ofs, "meta"))
40 return DIFF_METAINFO;
41 if (!strcasecmp(var+ofs, "frag"))
42 return DIFF_FRAGINFO;
43 if (!strcasecmp(var+ofs, "old"))
44 return DIFF_FILE_OLD;
45 if (!strcasecmp(var+ofs, "new"))
46 return DIFF_FILE_NEW;
47 if (!strcasecmp(var+ofs, "commit"))
48 return DIFF_COMMIT;
49 if (!strcasecmp(var+ofs, "whitespace"))
50 return DIFF_WHITESPACE;
51 die("bad config variable '%s'", var);
52 }
53
54 static struct ll_diff_driver {
55 const char *name;
56 struct ll_diff_driver *next;
57 char *cmd;
58 } *user_diff, **user_diff_tail;
59
60 static void read_config_if_needed(void)
61 {
62 if (!user_diff_tail) {
63 user_diff_tail = &user_diff;
64 git_config(git_diff_ui_config);
65 }
66 }
67
68 /*
69 * Currently there is only "diff.<drivername>.command" variable;
70 * because there are "diff.color.<slot>" variables, we are parsing
71 * this in a bit convoluted way to allow low level diff driver
72 * called "color".
73 */
74 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
75 {
76 const char *name;
77 int namelen;
78 struct ll_diff_driver *drv;
79
80 name = var + 5;
81 namelen = ep - name;
82 for (drv = user_diff; drv; drv = drv->next)
83 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
84 break;
85 if (!drv) {
86 char *namebuf;
87 drv = xcalloc(1, sizeof(struct ll_diff_driver));
88 namebuf = xmalloc(namelen + 1);
89 memcpy(namebuf, name, namelen);
90 namebuf[namelen] = 0;
91 drv->name = namebuf;
92 drv->next = NULL;
93 if (!user_diff_tail)
94 user_diff_tail = &user_diff;
95 *user_diff_tail = drv;
96 user_diff_tail = &(drv->next);
97 }
98
99 if (!value)
100 return error("%s: lacks value", var);
101 drv->cmd = strdup(value);
102 return 0;
103 }
104
105 /*
106 * 'diff.<what>.funcname' attribute can be specified in the configuration
107 * to define a customized regexp to find the beginning of a function to
108 * be used for hunk header lines of "diff -p" style output.
109 */
110 static struct funcname_pattern {
111 char *name;
112 char *pattern;
113 struct funcname_pattern *next;
114 } *funcname_pattern_list;
115
116 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
117 {
118 const char *name;
119 int namelen;
120 struct funcname_pattern *pp;
121
122 name = var + 5; /* "diff." */
123 namelen = ep - name;
124
125 for (pp = funcname_pattern_list; pp; pp = pp->next)
126 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
127 break;
128 if (!pp) {
129 char *namebuf;
130 pp = xcalloc(1, sizeof(*pp));
131 namebuf = xmalloc(namelen + 1);
132 memcpy(namebuf, name, namelen);
133 namebuf[namelen] = 0;
134 pp->name = namebuf;
135 pp->next = funcname_pattern_list;
136 funcname_pattern_list = pp;
137 }
138 if (pp->pattern)
139 free(pp->pattern);
140 pp->pattern = xstrdup(value);
141 return 0;
142 }
143
144 /*
145 * These are to give UI layer defaults.
146 * The core-level commands such as git-diff-files should
147 * never be affected by the setting of diff.renames
148 * the user happens to have in the configuration file.
149 */
150 int git_diff_ui_config(const char *var, const char *value)
151 {
152 if (!strcmp(var, "diff.renamelimit")) {
153 diff_rename_limit_default = git_config_int(var, value);
154 return 0;
155 }
156 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
157 diff_use_color_default = git_config_colorbool(var, value);
158 return 0;
159 }
160 if (!strcmp(var, "diff.renames")) {
161 if (!value)
162 diff_detect_rename_default = DIFF_DETECT_RENAME;
163 else if (!strcasecmp(value, "copies") ||
164 !strcasecmp(value, "copy"))
165 diff_detect_rename_default = DIFF_DETECT_COPY;
166 else if (git_config_bool(var,value))
167 diff_detect_rename_default = DIFF_DETECT_RENAME;
168 return 0;
169 }
170 if (!strcmp(var, "diff.autorefreshindex")) {
171 diff_auto_refresh_index = git_config_bool(var, value);
172 return 0;
173 }
174 if (!prefixcmp(var, "diff.")) {
175 const char *ep = strrchr(var, '.');
176
177 if (ep != var + 4) {
178 if (!strcmp(ep, ".command"))
179 return parse_lldiff_command(var, ep, value);
180 if (!strcmp(ep, ".funcname"))
181 return parse_funcname_pattern(var, ep, value);
182 }
183 }
184 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
185 int slot = parse_diff_color_slot(var, 11);
186 color_parse(value, var, diff_colors[slot]);
187 return 0;
188 }
189
190 return git_default_config(var, value);
191 }
192
193 static char *quote_one(const char *str)
194 {
195 int needlen;
196 char *xp;
197
198 if (!str)
199 return NULL;
200 needlen = quote_c_style(str, NULL, NULL, 0);
201 if (!needlen)
202 return xstrdup(str);
203 xp = xmalloc(needlen + 1);
204 quote_c_style(str, xp, NULL, 0);
205 return xp;
206 }
207
208 static char *quote_two(const char *one, const char *two)
209 {
210 int need_one = quote_c_style(one, NULL, NULL, 1);
211 int need_two = quote_c_style(two, NULL, NULL, 1);
212 char *xp;
213
214 if (need_one + need_two) {
215 if (!need_one) need_one = strlen(one);
216 if (!need_two) need_one = strlen(two);
217
218 xp = xmalloc(need_one + need_two + 3);
219 xp[0] = '"';
220 quote_c_style(one, xp + 1, NULL, 1);
221 quote_c_style(two, xp + need_one + 1, NULL, 1);
222 strcpy(xp + need_one + need_two + 1, "\"");
223 return xp;
224 }
225 need_one = strlen(one);
226 need_two = strlen(two);
227 xp = xmalloc(need_one + need_two + 1);
228 strcpy(xp, one);
229 strcpy(xp + need_one, two);
230 return xp;
231 }
232
233 static const char *external_diff(void)
234 {
235 static const char *external_diff_cmd = NULL;
236 static int done_preparing = 0;
237
238 if (done_preparing)
239 return external_diff_cmd;
240 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
241 done_preparing = 1;
242 return external_diff_cmd;
243 }
244
245 static struct diff_tempfile {
246 const char *name; /* filename external diff should read from */
247 char hex[41];
248 char mode[10];
249 char tmp_path[PATH_MAX];
250 } diff_temp[2];
251
252 static int count_lines(const char *data, int size)
253 {
254 int count, ch, completely_empty = 1, nl_just_seen = 0;
255 count = 0;
256 while (0 < size--) {
257 ch = *data++;
258 if (ch == '\n') {
259 count++;
260 nl_just_seen = 1;
261 completely_empty = 0;
262 }
263 else {
264 nl_just_seen = 0;
265 completely_empty = 0;
266 }
267 }
268 if (completely_empty)
269 return 0;
270 if (!nl_just_seen)
271 count++; /* no trailing newline */
272 return count;
273 }
274
275 static void print_line_count(int count)
276 {
277 switch (count) {
278 case 0:
279 printf("0,0");
280 break;
281 case 1:
282 printf("1");
283 break;
284 default:
285 printf("1,%d", count);
286 break;
287 }
288 }
289
290 static void copy_file(int prefix, const char *data, int size,
291 const char *set, const char *reset)
292 {
293 int ch, nl_just_seen = 1;
294 while (0 < size--) {
295 ch = *data++;
296 if (nl_just_seen) {
297 fputs(set, stdout);
298 putchar(prefix);
299 }
300 if (ch == '\n') {
301 nl_just_seen = 1;
302 fputs(reset, stdout);
303 } else
304 nl_just_seen = 0;
305 putchar(ch);
306 }
307 if (!nl_just_seen)
308 printf("%s\n\\ No newline at end of file\n", reset);
309 }
310
311 static void emit_rewrite_diff(const char *name_a,
312 const char *name_b,
313 struct diff_filespec *one,
314 struct diff_filespec *two,
315 int color_diff)
316 {
317 int lc_a, lc_b;
318 const char *name_a_tab, *name_b_tab;
319 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
320 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
321 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
322 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
323 const char *reset = diff_get_color(color_diff, DIFF_RESET);
324
325 name_a += (*name_a == '/');
326 name_b += (*name_b == '/');
327 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
328 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
329
330 diff_populate_filespec(one, 0);
331 diff_populate_filespec(two, 0);
332 lc_a = count_lines(one->data, one->size);
333 lc_b = count_lines(two->data, two->size);
334 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
335 metainfo, name_a, name_a_tab, reset,
336 metainfo, name_b, name_b_tab, reset, fraginfo);
337 print_line_count(lc_a);
338 printf(" +");
339 print_line_count(lc_b);
340 printf(" @@%s\n", reset);
341 if (lc_a)
342 copy_file('-', one->data, one->size, old, reset);
343 if (lc_b)
344 copy_file('+', two->data, two->size, new, reset);
345 }
346
347 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
348 {
349 if (!DIFF_FILE_VALID(one)) {
350 mf->ptr = (char *)""; /* does not matter */
351 mf->size = 0;
352 return 0;
353 }
354 else if (diff_populate_filespec(one, 0))
355 return -1;
356 mf->ptr = one->data;
357 mf->size = one->size;
358 return 0;
359 }
360
361 struct diff_words_buffer {
362 mmfile_t text;
363 long alloc;
364 long current; /* output pointer */
365 int suppressed_newline;
366 };
367
368 static void diff_words_append(char *line, unsigned long len,
369 struct diff_words_buffer *buffer)
370 {
371 if (buffer->text.size + len > buffer->alloc) {
372 buffer->alloc = (buffer->text.size + len) * 3 / 2;
373 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
374 }
375 line++;
376 len--;
377 memcpy(buffer->text.ptr + buffer->text.size, line, len);
378 buffer->text.size += len;
379 }
380
381 struct diff_words_data {
382 struct xdiff_emit_state xm;
383 struct diff_words_buffer minus, plus;
384 };
385
386 static void print_word(struct diff_words_buffer *buffer, int len, int color,
387 int suppress_newline)
388 {
389 const char *ptr;
390 int eol = 0;
391
392 if (len == 0)
393 return;
394
395 ptr = buffer->text.ptr + buffer->current;
396 buffer->current += len;
397
398 if (ptr[len - 1] == '\n') {
399 eol = 1;
400 len--;
401 }
402
403 fputs(diff_get_color(1, color), stdout);
404 fwrite(ptr, len, 1, stdout);
405 fputs(diff_get_color(1, DIFF_RESET), stdout);
406
407 if (eol) {
408 if (suppress_newline)
409 buffer->suppressed_newline = 1;
410 else
411 putchar('\n');
412 }
413 }
414
415 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
416 {
417 struct diff_words_data *diff_words = priv;
418
419 if (diff_words->minus.suppressed_newline) {
420 if (line[0] != '+')
421 putchar('\n');
422 diff_words->minus.suppressed_newline = 0;
423 }
424
425 len--;
426 switch (line[0]) {
427 case '-':
428 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
429 break;
430 case '+':
431 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
432 break;
433 case ' ':
434 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
435 diff_words->minus.current += len;
436 break;
437 }
438 }
439
440 /* this executes the word diff on the accumulated buffers */
441 static void diff_words_show(struct diff_words_data *diff_words)
442 {
443 xpparam_t xpp;
444 xdemitconf_t xecfg;
445 xdemitcb_t ecb;
446 mmfile_t minus, plus;
447 int i;
448
449 memset(&xecfg, 0, sizeof(xecfg));
450 minus.size = diff_words->minus.text.size;
451 minus.ptr = xmalloc(minus.size);
452 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
453 for (i = 0; i < minus.size; i++)
454 if (isspace(minus.ptr[i]))
455 minus.ptr[i] = '\n';
456 diff_words->minus.current = 0;
457
458 plus.size = diff_words->plus.text.size;
459 plus.ptr = xmalloc(plus.size);
460 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
461 for (i = 0; i < plus.size; i++)
462 if (isspace(plus.ptr[i]))
463 plus.ptr[i] = '\n';
464 diff_words->plus.current = 0;
465
466 xpp.flags = XDF_NEED_MINIMAL;
467 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
468 ecb.outf = xdiff_outf;
469 ecb.priv = diff_words;
470 diff_words->xm.consume = fn_out_diff_words_aux;
471 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
472
473 free(minus.ptr);
474 free(plus.ptr);
475 diff_words->minus.text.size = diff_words->plus.text.size = 0;
476
477 if (diff_words->minus.suppressed_newline) {
478 putchar('\n');
479 diff_words->minus.suppressed_newline = 0;
480 }
481 }
482
483 struct emit_callback {
484 struct xdiff_emit_state xm;
485 int nparents, color_diff;
486 const char **label_path;
487 struct diff_words_data *diff_words;
488 int *found_changesp;
489 };
490
491 static void free_diff_words_data(struct emit_callback *ecbdata)
492 {
493 if (ecbdata->diff_words) {
494 /* flush buffers */
495 if (ecbdata->diff_words->minus.text.size ||
496 ecbdata->diff_words->plus.text.size)
497 diff_words_show(ecbdata->diff_words);
498
499 if (ecbdata->diff_words->minus.text.ptr)
500 free (ecbdata->diff_words->minus.text.ptr);
501 if (ecbdata->diff_words->plus.text.ptr)
502 free (ecbdata->diff_words->plus.text.ptr);
503 free(ecbdata->diff_words);
504 ecbdata->diff_words = NULL;
505 }
506 }
507
508 const char *diff_get_color(int diff_use_color, enum color_diff ix)
509 {
510 if (diff_use_color)
511 return diff_colors[ix];
512 return "";
513 }
514
515 static void emit_line(const char *set, const char *reset, const char *line, int len)
516 {
517 if (len > 0 && line[len-1] == '\n')
518 len--;
519 fputs(set, stdout);
520 fwrite(line, len, 1, stdout);
521 puts(reset);
522 }
523
524 static void emit_line_with_ws(int nparents,
525 const char *set, const char *reset, const char *ws,
526 const char *line, int len)
527 {
528 int col0 = nparents;
529 int last_tab_in_indent = -1;
530 int last_space_in_indent = -1;
531 int i;
532 int tail = len;
533 int need_highlight_leading_space = 0;
534 /* The line is a newly added line. Does it have funny leading
535 * whitespaces? In indent, SP should never precede a TAB.
536 */
537 for (i = col0; i < len; i++) {
538 if (line[i] == '\t') {
539 last_tab_in_indent = i;
540 if (0 <= last_space_in_indent)
541 need_highlight_leading_space = 1;
542 }
543 else if (line[i] == ' ')
544 last_space_in_indent = i;
545 else
546 break;
547 }
548 fputs(set, stdout);
549 fwrite(line, col0, 1, stdout);
550 fputs(reset, stdout);
551 if (((i == len) || line[i] == '\n') && i != col0) {
552 /* The whole line was indent */
553 emit_line(ws, reset, line + col0, len - col0);
554 return;
555 }
556 i = col0;
557 if (need_highlight_leading_space) {
558 while (i < last_tab_in_indent) {
559 if (line[i] == ' ') {
560 fputs(ws, stdout);
561 putchar(' ');
562 fputs(reset, stdout);
563 }
564 else
565 putchar(line[i]);
566 i++;
567 }
568 }
569 tail = len - 1;
570 if (line[tail] == '\n' && i < tail)
571 tail--;
572 while (i < tail) {
573 if (!isspace(line[tail]))
574 break;
575 tail--;
576 }
577 if ((i < tail && line[tail + 1] != '\n')) {
578 /* This has whitespace between tail+1..len */
579 fputs(set, stdout);
580 fwrite(line + i, tail - i + 1, 1, stdout);
581 fputs(reset, stdout);
582 emit_line(ws, reset, line + tail + 1, len - tail - 1);
583 }
584 else
585 emit_line(set, reset, line + i, len - i);
586 }
587
588 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
589 {
590 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
591 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
592
593 if (!*ws)
594 emit_line(set, reset, line, len);
595 else
596 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
597 line, len);
598 }
599
600 static void fn_out_consume(void *priv, char *line, unsigned long len)
601 {
602 int i;
603 int color;
604 struct emit_callback *ecbdata = priv;
605 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
606 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
607
608 *(ecbdata->found_changesp) = 1;
609
610 if (ecbdata->label_path[0]) {
611 const char *name_a_tab, *name_b_tab;
612
613 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
614 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
615
616 printf("%s--- %s%s%s\n",
617 set, ecbdata->label_path[0], reset, name_a_tab);
618 printf("%s+++ %s%s%s\n",
619 set, ecbdata->label_path[1], reset, name_b_tab);
620 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
621 }
622
623 /* This is not really necessary for now because
624 * this codepath only deals with two-way diffs.
625 */
626 for (i = 0; i < len && line[i] == '@'; i++)
627 ;
628 if (2 <= i && i < len && line[i] == ' ') {
629 ecbdata->nparents = i - 1;
630 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
631 reset, line, len);
632 return;
633 }
634
635 if (len < ecbdata->nparents) {
636 set = reset;
637 emit_line(reset, reset, line, len);
638 return;
639 }
640
641 color = DIFF_PLAIN;
642 if (ecbdata->diff_words && ecbdata->nparents != 1)
643 /* fall back to normal diff */
644 free_diff_words_data(ecbdata);
645 if (ecbdata->diff_words) {
646 if (line[0] == '-') {
647 diff_words_append(line, len,
648 &ecbdata->diff_words->minus);
649 return;
650 } else if (line[0] == '+') {
651 diff_words_append(line, len,
652 &ecbdata->diff_words->plus);
653 return;
654 }
655 if (ecbdata->diff_words->minus.text.size ||
656 ecbdata->diff_words->plus.text.size)
657 diff_words_show(ecbdata->diff_words);
658 line++;
659 len--;
660 emit_line(set, reset, line, len);
661 return;
662 }
663 for (i = 0; i < ecbdata->nparents && len; i++) {
664 if (line[i] == '-')
665 color = DIFF_FILE_OLD;
666 else if (line[i] == '+')
667 color = DIFF_FILE_NEW;
668 }
669
670 if (color != DIFF_FILE_NEW) {
671 emit_line(diff_get_color(ecbdata->color_diff, color),
672 reset, line, len);
673 return;
674 }
675 emit_add_line(reset, ecbdata, line, len);
676 }
677
678 static char *pprint_rename(const char *a, const char *b)
679 {
680 const char *old = a;
681 const char *new = b;
682 char *name = NULL;
683 int pfx_length, sfx_length;
684 int len_a = strlen(a);
685 int len_b = strlen(b);
686 int qlen_a = quote_c_style(a, NULL, NULL, 0);
687 int qlen_b = quote_c_style(b, NULL, NULL, 0);
688
689 if (qlen_a || qlen_b) {
690 if (qlen_a) len_a = qlen_a;
691 if (qlen_b) len_b = qlen_b;
692 name = xmalloc( len_a + len_b + 5 );
693 if (qlen_a)
694 quote_c_style(a, name, NULL, 0);
695 else
696 memcpy(name, a, len_a);
697 memcpy(name + len_a, " => ", 4);
698 if (qlen_b)
699 quote_c_style(b, name + len_a + 4, NULL, 0);
700 else
701 memcpy(name + len_a + 4, b, len_b + 1);
702 return name;
703 }
704
705 /* Find common prefix */
706 pfx_length = 0;
707 while (*old && *new && *old == *new) {
708 if (*old == '/')
709 pfx_length = old - a + 1;
710 old++;
711 new++;
712 }
713
714 /* Find common suffix */
715 old = a + len_a;
716 new = b + len_b;
717 sfx_length = 0;
718 while (a <= old && b <= new && *old == *new) {
719 if (*old == '/')
720 sfx_length = len_a - (old - a);
721 old--;
722 new--;
723 }
724
725 /*
726 * pfx{mid-a => mid-b}sfx
727 * {pfx-a => pfx-b}sfx
728 * pfx{sfx-a => sfx-b}
729 * name-a => name-b
730 */
731 if (pfx_length + sfx_length) {
732 int a_midlen = len_a - pfx_length - sfx_length;
733 int b_midlen = len_b - pfx_length - sfx_length;
734 if (a_midlen < 0) a_midlen = 0;
735 if (b_midlen < 0) b_midlen = 0;
736
737 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
738 sprintf(name, "%.*s{%.*s => %.*s}%s",
739 pfx_length, a,
740 a_midlen, a + pfx_length,
741 b_midlen, b + pfx_length,
742 a + len_a - sfx_length);
743 }
744 else {
745 name = xmalloc(len_a + len_b + 5);
746 sprintf(name, "%s => %s", a, b);
747 }
748 return name;
749 }
750
751 struct diffstat_t {
752 struct xdiff_emit_state xm;
753
754 int nr;
755 int alloc;
756 struct diffstat_file {
757 char *name;
758 unsigned is_unmerged:1;
759 unsigned is_binary:1;
760 unsigned is_renamed:1;
761 unsigned int added, deleted;
762 } **files;
763 };
764
765 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
766 const char *name_a,
767 const char *name_b)
768 {
769 struct diffstat_file *x;
770 x = xcalloc(sizeof (*x), 1);
771 if (diffstat->nr == diffstat->alloc) {
772 diffstat->alloc = alloc_nr(diffstat->alloc);
773 diffstat->files = xrealloc(diffstat->files,
774 diffstat->alloc * sizeof(x));
775 }
776 diffstat->files[diffstat->nr++] = x;
777 if (name_b) {
778 x->name = pprint_rename(name_a, name_b);
779 x->is_renamed = 1;
780 }
781 else
782 x->name = xstrdup(name_a);
783 return x;
784 }
785
786 static void diffstat_consume(void *priv, char *line, unsigned long len)
787 {
788 struct diffstat_t *diffstat = priv;
789 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
790
791 if (line[0] == '+')
792 x->added++;
793 else if (line[0] == '-')
794 x->deleted++;
795 }
796
797 const char mime_boundary_leader[] = "------------";
798
799 static int scale_linear(int it, int width, int max_change)
800 {
801 /*
802 * make sure that at least one '-' is printed if there were deletions,
803 * and likewise for '+'.
804 */
805 if (max_change < 2)
806 return it;
807 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
808 }
809
810 static void show_name(const char *prefix, const char *name, int len,
811 const char *reset, const char *set)
812 {
813 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
814 }
815
816 static void show_graph(char ch, int cnt, const char *set, const char *reset)
817 {
818 if (cnt <= 0)
819 return;
820 printf("%s", set);
821 while (cnt--)
822 putchar(ch);
823 printf("%s", reset);
824 }
825
826 static void show_stats(struct diffstat_t* data, struct diff_options *options)
827 {
828 int i, len, add, del, total, adds = 0, dels = 0;
829 int max_change = 0, max_len = 0;
830 int total_files = data->nr;
831 int width, name_width;
832 const char *reset, *set, *add_c, *del_c;
833
834 if (data->nr == 0)
835 return;
836
837 width = options->stat_width ? options->stat_width : 80;
838 name_width = options->stat_name_width ? options->stat_name_width : 50;
839
840 /* Sanity: give at least 5 columns to the graph,
841 * but leave at least 10 columns for the name.
842 */
843 if (width < name_width + 15) {
844 if (name_width <= 25)
845 width = name_width + 15;
846 else
847 name_width = width - 15;
848 }
849
850 /* Find the longest filename and max number of changes */
851 reset = diff_get_color(options->color_diff, DIFF_RESET);
852 set = diff_get_color(options->color_diff, DIFF_PLAIN);
853 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
854 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
855
856 for (i = 0; i < data->nr; i++) {
857 struct diffstat_file *file = data->files[i];
858 int change = file->added + file->deleted;
859
860 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
861 len = quote_c_style(file->name, NULL, NULL, 0);
862 if (len) {
863 char *qname = xmalloc(len + 1);
864 quote_c_style(file->name, qname, NULL, 0);
865 free(file->name);
866 file->name = qname;
867 }
868 }
869
870 len = strlen(file->name);
871 if (max_len < len)
872 max_len = len;
873
874 if (file->is_binary || file->is_unmerged)
875 continue;
876 if (max_change < change)
877 max_change = change;
878 }
879
880 /* Compute the width of the graph part;
881 * 10 is for one blank at the beginning of the line plus
882 * " | count " between the name and the graph.
883 *
884 * From here on, name_width is the width of the name area,
885 * and width is the width of the graph area.
886 */
887 name_width = (name_width < max_len) ? name_width : max_len;
888 if (width < (name_width + 10) + max_change)
889 width = width - (name_width + 10);
890 else
891 width = max_change;
892
893 for (i = 0; i < data->nr; i++) {
894 const char *prefix = "";
895 char *name = data->files[i]->name;
896 int added = data->files[i]->added;
897 int deleted = data->files[i]->deleted;
898 int name_len;
899
900 /*
901 * "scale" the filename
902 */
903 len = name_width;
904 name_len = strlen(name);
905 if (name_width < name_len) {
906 char *slash;
907 prefix = "...";
908 len -= 3;
909 name += name_len - len;
910 slash = strchr(name, '/');
911 if (slash)
912 name = slash;
913 }
914
915 if (data->files[i]->is_binary) {
916 show_name(prefix, name, len, reset, set);
917 printf(" Bin ");
918 printf("%s%d%s", del_c, deleted, reset);
919 printf(" -> ");
920 printf("%s%d%s", add_c, added, reset);
921 printf(" bytes");
922 printf("\n");
923 goto free_diffstat_file;
924 }
925 else if (data->files[i]->is_unmerged) {
926 show_name(prefix, name, len, reset, set);
927 printf(" Unmerged\n");
928 goto free_diffstat_file;
929 }
930 else if (!data->files[i]->is_renamed &&
931 (added + deleted == 0)) {
932 total_files--;
933 goto free_diffstat_file;
934 }
935
936 /*
937 * scale the add/delete
938 */
939 add = added;
940 del = deleted;
941 total = add + del;
942 adds += add;
943 dels += del;
944
945 if (width <= max_change) {
946 add = scale_linear(add, width, max_change);
947 del = scale_linear(del, width, max_change);
948 total = add + del;
949 }
950 show_name(prefix, name, len, reset, set);
951 printf("%5d ", added + deleted);
952 show_graph('+', add, add_c, reset);
953 show_graph('-', del, del_c, reset);
954 putchar('\n');
955 free_diffstat_file:
956 free(data->files[i]->name);
957 free(data->files[i]);
958 }
959 free(data->files);
960 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
961 set, total_files, adds, dels, reset);
962 }
963
964 static void show_shortstats(struct diffstat_t* data)
965 {
966 int i, adds = 0, dels = 0, total_files = data->nr;
967
968 if (data->nr == 0)
969 return;
970
971 for (i = 0; i < data->nr; i++) {
972 if (!data->files[i]->is_binary &&
973 !data->files[i]->is_unmerged) {
974 int added = data->files[i]->added;
975 int deleted= data->files[i]->deleted;
976 if (!data->files[i]->is_renamed &&
977 (added + deleted == 0)) {
978 total_files--;
979 } else {
980 adds += added;
981 dels += deleted;
982 }
983 }
984 free(data->files[i]->name);
985 free(data->files[i]);
986 }
987 free(data->files);
988
989 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
990 total_files, adds, dels);
991 }
992
993 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
994 {
995 int i;
996
997 for (i = 0; i < data->nr; i++) {
998 struct diffstat_file *file = data->files[i];
999
1000 if (file->is_binary)
1001 printf("-\t-\t");
1002 else
1003 printf("%d\t%d\t", file->added, file->deleted);
1004 if (options->line_termination && !file->is_renamed &&
1005 quote_c_style(file->name, NULL, NULL, 0))
1006 quote_c_style(file->name, NULL, stdout, 0);
1007 else
1008 fputs(file->name, stdout);
1009 putchar(options->line_termination);
1010 }
1011 }
1012
1013 struct checkdiff_t {
1014 struct xdiff_emit_state xm;
1015 const char *filename;
1016 int lineno, color_diff;
1017 };
1018
1019 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1020 {
1021 struct checkdiff_t *data = priv;
1022 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1023 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1024 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
1025
1026 if (line[0] == '+') {
1027 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
1028
1029 /* check space before tab */
1030 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
1031 if (line[i] == ' ')
1032 spaces++;
1033 if (line[i - 1] == '\t' && spaces)
1034 space_before_tab = 1;
1035
1036 /* check white space at line end */
1037 if (line[len - 1] == '\n')
1038 len--;
1039 if (isspace(line[len - 1]))
1040 white_space_at_end = 1;
1041
1042 if (space_before_tab || white_space_at_end) {
1043 printf("%s:%d: %s", data->filename, data->lineno, ws);
1044 if (space_before_tab) {
1045 printf("space before tab");
1046 if (white_space_at_end)
1047 putchar(',');
1048 }
1049 if (white_space_at_end)
1050 printf("white space at end");
1051 printf(":%s ", reset);
1052 emit_line_with_ws(1, set, reset, ws, line, len);
1053 }
1054
1055 data->lineno++;
1056 } else if (line[0] == ' ')
1057 data->lineno++;
1058 else if (line[0] == '@') {
1059 char *plus = strchr(line, '+');
1060 if (plus)
1061 data->lineno = strtol(plus, NULL, 10);
1062 else
1063 die("invalid diff");
1064 }
1065 }
1066
1067 static unsigned char *deflate_it(char *data,
1068 unsigned long size,
1069 unsigned long *result_size)
1070 {
1071 int bound;
1072 unsigned char *deflated;
1073 z_stream stream;
1074
1075 memset(&stream, 0, sizeof(stream));
1076 deflateInit(&stream, zlib_compression_level);
1077 bound = deflateBound(&stream, size);
1078 deflated = xmalloc(bound);
1079 stream.next_out = deflated;
1080 stream.avail_out = bound;
1081
1082 stream.next_in = (unsigned char *)data;
1083 stream.avail_in = size;
1084 while (deflate(&stream, Z_FINISH) == Z_OK)
1085 ; /* nothing */
1086 deflateEnd(&stream);
1087 *result_size = stream.total_out;
1088 return deflated;
1089 }
1090
1091 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1092 {
1093 void *cp;
1094 void *delta;
1095 void *deflated;
1096 void *data;
1097 unsigned long orig_size;
1098 unsigned long delta_size;
1099 unsigned long deflate_size;
1100 unsigned long data_size;
1101
1102 /* We could do deflated delta, or we could do just deflated two,
1103 * whichever is smaller.
1104 */
1105 delta = NULL;
1106 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1107 if (one->size && two->size) {
1108 delta = diff_delta(one->ptr, one->size,
1109 two->ptr, two->size,
1110 &delta_size, deflate_size);
1111 if (delta) {
1112 void *to_free = delta;
1113 orig_size = delta_size;
1114 delta = deflate_it(delta, delta_size, &delta_size);
1115 free(to_free);
1116 }
1117 }
1118
1119 if (delta && delta_size < deflate_size) {
1120 printf("delta %lu\n", orig_size);
1121 free(deflated);
1122 data = delta;
1123 data_size = delta_size;
1124 }
1125 else {
1126 printf("literal %lu\n", two->size);
1127 free(delta);
1128 data = deflated;
1129 data_size = deflate_size;
1130 }
1131
1132 /* emit data encoded in base85 */
1133 cp = data;
1134 while (data_size) {
1135 int bytes = (52 < data_size) ? 52 : data_size;
1136 char line[70];
1137 data_size -= bytes;
1138 if (bytes <= 26)
1139 line[0] = bytes + 'A' - 1;
1140 else
1141 line[0] = bytes - 26 + 'a' - 1;
1142 encode_85(line + 1, cp, bytes);
1143 cp = (char *) cp + bytes;
1144 puts(line);
1145 }
1146 printf("\n");
1147 free(data);
1148 }
1149
1150 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1151 {
1152 printf("GIT binary patch\n");
1153 emit_binary_diff_body(one, two);
1154 emit_binary_diff_body(two, one);
1155 }
1156
1157 static void setup_diff_attr_check(struct git_attr_check *check)
1158 {
1159 static struct git_attr *attr_diff;
1160
1161 if (!attr_diff) {
1162 attr_diff = git_attr("diff", 4);
1163 }
1164 check[0].attr = attr_diff;
1165 }
1166
1167 static void diff_filespec_check_attr(struct diff_filespec *one)
1168 {
1169 struct git_attr_check attr_diff_check;
1170 int check_from_data = 0;
1171
1172 if (one->checked_attr)
1173 return;
1174
1175 setup_diff_attr_check(&attr_diff_check);
1176 one->is_binary = 0;
1177 one->funcname_pattern_ident = NULL;
1178
1179 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1180 const char *value;
1181
1182 /* binaryness */
1183 value = attr_diff_check.value;
1184 if (ATTR_TRUE(value))
1185 ;
1186 else if (ATTR_FALSE(value))
1187 one->is_binary = 1;
1188 else
1189 check_from_data = 1;
1190
1191 /* funcname pattern ident */
1192 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1193 ;
1194 else
1195 one->funcname_pattern_ident = value;
1196 }
1197
1198 if (check_from_data) {
1199 if (!one->data && DIFF_FILE_VALID(one))
1200 diff_populate_filespec(one, 0);
1201
1202 if (one->data)
1203 one->is_binary = buffer_is_binary(one->data, one->size);
1204 }
1205 }
1206
1207 int diff_filespec_is_binary(struct diff_filespec *one)
1208 {
1209 diff_filespec_check_attr(one);
1210 return one->is_binary;
1211 }
1212
1213 static const char *funcname_pattern(const char *ident)
1214 {
1215 struct funcname_pattern *pp;
1216
1217 read_config_if_needed();
1218 for (pp = funcname_pattern_list; pp; pp = pp->next)
1219 if (!strcmp(ident, pp->name))
1220 return pp->pattern;
1221 return NULL;
1222 }
1223
1224 static struct builtin_funcname_pattern {
1225 const char *name;
1226 const char *pattern;
1227 } builtin_funcname_pattern[] = {
1228 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1229 "new\\|return\\|switch\\|throw\\|while\\)\n"
1230 "^[ ]*\\(\\([ ]*"
1231 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1232 "[ ]*([^;]*$\\)" },
1233 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1234 };
1235
1236 static const char *diff_funcname_pattern(struct diff_filespec *one)
1237 {
1238 const char *ident, *pattern;
1239 int i;
1240
1241 diff_filespec_check_attr(one);
1242 ident = one->funcname_pattern_ident;
1243
1244 if (!ident)
1245 /*
1246 * If the config file has "funcname.default" defined, that
1247 * regexp is used; otherwise NULL is returned and xemit uses
1248 * the built-in default.
1249 */
1250 return funcname_pattern("default");
1251
1252 /* Look up custom "funcname.$ident" regexp from config. */
1253 pattern = funcname_pattern(ident);
1254 if (pattern)
1255 return pattern;
1256
1257 /*
1258 * And define built-in fallback patterns here. Note that
1259 * these can be overriden by the user's config settings.
1260 */
1261 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1262 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1263 return builtin_funcname_pattern[i].pattern;
1264
1265 return NULL;
1266 }
1267
1268 static void builtin_diff(const char *name_a,
1269 const char *name_b,
1270 struct diff_filespec *one,
1271 struct diff_filespec *two,
1272 const char *xfrm_msg,
1273 struct diff_options *o,
1274 int complete_rewrite)
1275 {
1276 mmfile_t mf1, mf2;
1277 const char *lbl[2];
1278 char *a_one, *b_two;
1279 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1280 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
1281
1282 a_one = quote_two("a/", name_a + (*name_a == '/'));
1283 b_two = quote_two("b/", name_b + (*name_b == '/'));
1284 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1285 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1286 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1287 if (lbl[0][0] == '/') {
1288 /* /dev/null */
1289 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1290 if (xfrm_msg && xfrm_msg[0])
1291 printf("%s%s%s\n", set, xfrm_msg, reset);
1292 }
1293 else if (lbl[1][0] == '/') {
1294 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1295 if (xfrm_msg && xfrm_msg[0])
1296 printf("%s%s%s\n", set, xfrm_msg, reset);
1297 }
1298 else {
1299 if (one->mode != two->mode) {
1300 printf("%sold mode %06o%s\n", set, one->mode, reset);
1301 printf("%snew mode %06o%s\n", set, two->mode, reset);
1302 }
1303 if (xfrm_msg && xfrm_msg[0])
1304 printf("%s%s%s\n", set, xfrm_msg, reset);
1305 /*
1306 * we do not run diff between different kind
1307 * of objects.
1308 */
1309 if ((one->mode ^ two->mode) & S_IFMT)
1310 goto free_ab_and_return;
1311 if (complete_rewrite) {
1312 emit_rewrite_diff(name_a, name_b, one, two,
1313 o->color_diff);
1314 o->found_changes = 1;
1315 goto free_ab_and_return;
1316 }
1317 }
1318
1319 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1320 die("unable to read files to diff");
1321
1322 if (!o->text &&
1323 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1324 /* Quite common confusing case */
1325 if (mf1.size == mf2.size &&
1326 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1327 goto free_ab_and_return;
1328 if (o->binary)
1329 emit_binary_diff(&mf1, &mf2);
1330 else
1331 printf("Binary files %s and %s differ\n",
1332 lbl[0], lbl[1]);
1333 o->found_changes = 1;
1334 }
1335 else {
1336 /* Crazy xdl interfaces.. */
1337 const char *diffopts = getenv("GIT_DIFF_OPTS");
1338 xpparam_t xpp;
1339 xdemitconf_t xecfg;
1340 xdemitcb_t ecb;
1341 struct emit_callback ecbdata;
1342 const char *funcname_pattern;
1343
1344 funcname_pattern = diff_funcname_pattern(one);
1345 if (!funcname_pattern)
1346 funcname_pattern = diff_funcname_pattern(two);
1347
1348 memset(&xecfg, 0, sizeof(xecfg));
1349 memset(&ecbdata, 0, sizeof(ecbdata));
1350 ecbdata.label_path = lbl;
1351 ecbdata.color_diff = o->color_diff;
1352 ecbdata.found_changesp = &o->found_changes;
1353 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1354 xecfg.ctxlen = o->context;
1355 xecfg.flags = XDL_EMIT_FUNCNAMES;
1356 if (funcname_pattern)
1357 xdiff_set_find_func(&xecfg, funcname_pattern);
1358 if (!diffopts)
1359 ;
1360 else if (!prefixcmp(diffopts, "--unified="))
1361 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1362 else if (!prefixcmp(diffopts, "-u"))
1363 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1364 ecb.outf = xdiff_outf;
1365 ecb.priv = &ecbdata;
1366 ecbdata.xm.consume = fn_out_consume;
1367 if (o->color_diff_words)
1368 ecbdata.diff_words =
1369 xcalloc(1, sizeof(struct diff_words_data));
1370 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1371 if (o->color_diff_words)
1372 free_diff_words_data(&ecbdata);
1373 }
1374
1375 free_ab_and_return:
1376 diff_free_filespec_data(one);
1377 diff_free_filespec_data(two);
1378 free(a_one);
1379 free(b_two);
1380 return;
1381 }
1382
1383 static void builtin_diffstat(const char *name_a, const char *name_b,
1384 struct diff_filespec *one,
1385 struct diff_filespec *two,
1386 struct diffstat_t *diffstat,
1387 struct diff_options *o,
1388 int complete_rewrite)
1389 {
1390 mmfile_t mf1, mf2;
1391 struct diffstat_file *data;
1392
1393 data = diffstat_add(diffstat, name_a, name_b);
1394
1395 if (!one || !two) {
1396 data->is_unmerged = 1;
1397 return;
1398 }
1399 if (complete_rewrite) {
1400 diff_populate_filespec(one, 0);
1401 diff_populate_filespec(two, 0);
1402 data->deleted = count_lines(one->data, one->size);
1403 data->added = count_lines(two->data, two->size);
1404 goto free_and_return;
1405 }
1406 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1407 die("unable to read files to diff");
1408
1409 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1410 data->is_binary = 1;
1411 data->added = mf2.size;
1412 data->deleted = mf1.size;
1413 } else {
1414 /* Crazy xdl interfaces.. */
1415 xpparam_t xpp;
1416 xdemitconf_t xecfg;
1417 xdemitcb_t ecb;
1418
1419 memset(&xecfg, 0, sizeof(xecfg));
1420 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1421 ecb.outf = xdiff_outf;
1422 ecb.priv = diffstat;
1423 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1424 }
1425
1426 free_and_return:
1427 diff_free_filespec_data(one);
1428 diff_free_filespec_data(two);
1429 }
1430
1431 static void builtin_checkdiff(const char *name_a, const char *name_b,
1432 struct diff_filespec *one,
1433 struct diff_filespec *two, struct diff_options *o)
1434 {
1435 mmfile_t mf1, mf2;
1436 struct checkdiff_t data;
1437
1438 if (!two)
1439 return;
1440
1441 memset(&data, 0, sizeof(data));
1442 data.xm.consume = checkdiff_consume;
1443 data.filename = name_b ? name_b : name_a;
1444 data.lineno = 0;
1445 data.color_diff = o->color_diff;
1446
1447 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1448 die("unable to read files to diff");
1449
1450 if (diff_filespec_is_binary(two))
1451 goto free_and_return;
1452 else {
1453 /* Crazy xdl interfaces.. */
1454 xpparam_t xpp;
1455 xdemitconf_t xecfg;
1456 xdemitcb_t ecb;
1457
1458 memset(&xecfg, 0, sizeof(xecfg));
1459 xpp.flags = XDF_NEED_MINIMAL;
1460 ecb.outf = xdiff_outf;
1461 ecb.priv = &data;
1462 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1463 }
1464 free_and_return:
1465 diff_free_filespec_data(one);
1466 diff_free_filespec_data(two);
1467 }
1468
1469 struct diff_filespec *alloc_filespec(const char *path)
1470 {
1471 int namelen = strlen(path);
1472 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1473
1474 memset(spec, 0, sizeof(*spec));
1475 spec->path = (char *)(spec + 1);
1476 memcpy(spec->path, path, namelen+1);
1477 return spec;
1478 }
1479
1480 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1481 unsigned short mode)
1482 {
1483 if (mode) {
1484 spec->mode = canon_mode(mode);
1485 hashcpy(spec->sha1, sha1);
1486 spec->sha1_valid = !is_null_sha1(sha1);
1487 }
1488 }
1489
1490 /*
1491 * Given a name and sha1 pair, if the index tells us the file in
1492 * the work tree has that object contents, return true, so that
1493 * prepare_temp_file() does not have to inflate and extract.
1494 */
1495 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1496 {
1497 struct cache_entry *ce;
1498 struct stat st;
1499 int pos, len;
1500
1501 /* We do not read the cache ourselves here, because the
1502 * benchmark with my previous version that always reads cache
1503 * shows that it makes things worse for diff-tree comparing
1504 * two linux-2.6 kernel trees in an already checked out work
1505 * tree. This is because most diff-tree comparisons deal with
1506 * only a small number of files, while reading the cache is
1507 * expensive for a large project, and its cost outweighs the
1508 * savings we get by not inflating the object to a temporary
1509 * file. Practically, this code only helps when we are used
1510 * by diff-cache --cached, which does read the cache before
1511 * calling us.
1512 */
1513 if (!active_cache)
1514 return 0;
1515
1516 /* We want to avoid the working directory if our caller
1517 * doesn't need the data in a normal file, this system
1518 * is rather slow with its stat/open/mmap/close syscalls,
1519 * and the object is contained in a pack file. The pack
1520 * is probably already open and will be faster to obtain
1521 * the data through than the working directory. Loose
1522 * objects however would tend to be slower as they need
1523 * to be individually opened and inflated.
1524 */
1525 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1526 return 0;
1527
1528 len = strlen(name);
1529 pos = cache_name_pos(name, len);
1530 if (pos < 0)
1531 return 0;
1532 ce = active_cache[pos];
1533 if ((lstat(name, &st) < 0) ||
1534 !S_ISREG(st.st_mode) || /* careful! */
1535 ce_match_stat(ce, &st, 0) ||
1536 hashcmp(sha1, ce->sha1))
1537 return 0;
1538 /* we return 1 only when we can stat, it is a regular file,
1539 * stat information matches, and sha1 recorded in the cache
1540 * matches. I.e. we know the file in the work tree really is
1541 * the same as the <name, sha1> pair.
1542 */
1543 return 1;
1544 }
1545
1546 static int populate_from_stdin(struct diff_filespec *s)
1547 {
1548 #define INCREMENT 1024
1549 char *buf;
1550 unsigned long size;
1551 ssize_t got;
1552
1553 size = 0;
1554 buf = NULL;
1555 while (1) {
1556 buf = xrealloc(buf, size + INCREMENT);
1557 got = xread(0, buf + size, INCREMENT);
1558 if (!got)
1559 break; /* EOF */
1560 if (got < 0)
1561 return error("error while reading from stdin %s",
1562 strerror(errno));
1563 size += got;
1564 }
1565 s->should_munmap = 0;
1566 s->data = buf;
1567 s->size = size;
1568 s->should_free = 1;
1569 return 0;
1570 }
1571
1572 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1573 {
1574 int len;
1575 char *data = xmalloc(100);
1576 len = snprintf(data, 100,
1577 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1578 s->data = data;
1579 s->size = len;
1580 s->should_free = 1;
1581 if (size_only) {
1582 s->data = NULL;
1583 free(data);
1584 }
1585 return 0;
1586 }
1587
1588 /*
1589 * While doing rename detection and pickaxe operation, we may need to
1590 * grab the data for the blob (or file) for our own in-core comparison.
1591 * diff_filespec has data and size fields for this purpose.
1592 */
1593 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1594 {
1595 int err = 0;
1596 if (!DIFF_FILE_VALID(s))
1597 die("internal error: asking to populate invalid file.");
1598 if (S_ISDIR(s->mode))
1599 return -1;
1600
1601 if (s->data)
1602 return 0;
1603
1604 if (size_only && 0 < s->size)
1605 return 0;
1606
1607 if (S_ISGITLINK(s->mode))
1608 return diff_populate_gitlink(s, size_only);
1609
1610 if (!s->sha1_valid ||
1611 reuse_worktree_file(s->path, s->sha1, 0)) {
1612 struct stat st;
1613 int fd;
1614 char *buf;
1615 unsigned long size;
1616
1617 if (!strcmp(s->path, "-"))
1618 return populate_from_stdin(s);
1619
1620 if (lstat(s->path, &st) < 0) {
1621 if (errno == ENOENT) {
1622 err_empty:
1623 err = -1;
1624 empty:
1625 s->data = (char *)"";
1626 s->size = 0;
1627 return err;
1628 }
1629 }
1630 s->size = xsize_t(st.st_size);
1631 if (!s->size)
1632 goto empty;
1633 if (size_only)
1634 return 0;
1635 if (S_ISLNK(st.st_mode)) {
1636 int ret;
1637 s->data = xmalloc(s->size);
1638 s->should_free = 1;
1639 ret = readlink(s->path, s->data, s->size);
1640 if (ret < 0) {
1641 free(s->data);
1642 goto err_empty;
1643 }
1644 return 0;
1645 }
1646 fd = open(s->path, O_RDONLY);
1647 if (fd < 0)
1648 goto err_empty;
1649 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1650 close(fd);
1651 s->should_munmap = 1;
1652
1653 /*
1654 * Convert from working tree format to canonical git format
1655 */
1656 size = s->size;
1657 buf = convert_to_git(s->path, s->data, &size);
1658 if (buf) {
1659 munmap(s->data, s->size);
1660 s->should_munmap = 0;
1661 s->data = buf;
1662 s->size = size;
1663 s->should_free = 1;
1664 }
1665 }
1666 else {
1667 enum object_type type;
1668 if (size_only)
1669 type = sha1_object_info(s->sha1, &s->size);
1670 else {
1671 s->data = read_sha1_file(s->sha1, &type, &s->size);
1672 s->should_free = 1;
1673 }
1674 }
1675 return 0;
1676 }
1677
1678 void diff_free_filespec_blob(struct diff_filespec *s)
1679 {
1680 if (s->should_free)
1681 free(s->data);
1682 else if (s->should_munmap)
1683 munmap(s->data, s->size);
1684
1685 if (s->should_free || s->should_munmap) {
1686 s->should_free = s->should_munmap = 0;
1687 s->data = NULL;
1688 }
1689 }
1690
1691 void diff_free_filespec_data(struct diff_filespec *s)
1692 {
1693 diff_free_filespec_blob(s);
1694 free(s->cnt_data);
1695 s->cnt_data = NULL;
1696 }
1697
1698 static void prep_temp_blob(struct diff_tempfile *temp,
1699 void *blob,
1700 unsigned long size,
1701 const unsigned char *sha1,
1702 int mode)
1703 {
1704 int fd;
1705
1706 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1707 if (fd < 0)
1708 die("unable to create temp-file: %s", strerror(errno));
1709 if (write_in_full(fd, blob, size) != size)
1710 die("unable to write temp-file");
1711 close(fd);
1712 temp->name = temp->tmp_path;
1713 strcpy(temp->hex, sha1_to_hex(sha1));
1714 temp->hex[40] = 0;
1715 sprintf(temp->mode, "%06o", mode);
1716 }
1717
1718 static void prepare_temp_file(const char *name,
1719 struct diff_tempfile *temp,
1720 struct diff_filespec *one)
1721 {
1722 if (!DIFF_FILE_VALID(one)) {
1723 not_a_valid_file:
1724 /* A '-' entry produces this for file-2, and
1725 * a '+' entry produces this for file-1.
1726 */
1727 temp->name = "/dev/null";
1728 strcpy(temp->hex, ".");
1729 strcpy(temp->mode, ".");
1730 return;
1731 }
1732
1733 if (!one->sha1_valid ||
1734 reuse_worktree_file(name, one->sha1, 1)) {
1735 struct stat st;
1736 if (lstat(name, &st) < 0) {
1737 if (errno == ENOENT)
1738 goto not_a_valid_file;
1739 die("stat(%s): %s", name, strerror(errno));
1740 }
1741 if (S_ISLNK(st.st_mode)) {
1742 int ret;
1743 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1744 size_t sz = xsize_t(st.st_size);
1745 if (sizeof(buf) <= st.st_size)
1746 die("symlink too long: %s", name);
1747 ret = readlink(name, buf, sz);
1748 if (ret < 0)
1749 die("readlink(%s)", name);
1750 prep_temp_blob(temp, buf, sz,
1751 (one->sha1_valid ?
1752 one->sha1 : null_sha1),
1753 (one->sha1_valid ?
1754 one->mode : S_IFLNK));
1755 }
1756 else {
1757 /* we can borrow from the file in the work tree */
1758 temp->name = name;
1759 if (!one->sha1_valid)
1760 strcpy(temp->hex, sha1_to_hex(null_sha1));
1761 else
1762 strcpy(temp->hex, sha1_to_hex(one->sha1));
1763 /* Even though we may sometimes borrow the
1764 * contents from the work tree, we always want
1765 * one->mode. mode is trustworthy even when
1766 * !(one->sha1_valid), as long as
1767 * DIFF_FILE_VALID(one).
1768 */
1769 sprintf(temp->mode, "%06o", one->mode);
1770 }
1771 return;
1772 }
1773 else {
1774 if (diff_populate_filespec(one, 0))
1775 die("cannot read data blob for %s", one->path);
1776 prep_temp_blob(temp, one->data, one->size,
1777 one->sha1, one->mode);
1778 }
1779 }
1780
1781 static void remove_tempfile(void)
1782 {
1783 int i;
1784
1785 for (i = 0; i < 2; i++)
1786 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1787 unlink(diff_temp[i].name);
1788 diff_temp[i].name = NULL;
1789 }
1790 }
1791
1792 static void remove_tempfile_on_signal(int signo)
1793 {
1794 remove_tempfile();
1795 signal(SIGINT, SIG_DFL);
1796 raise(signo);
1797 }
1798
1799 static int spawn_prog(const char *pgm, const char **arg)
1800 {
1801 pid_t pid;
1802 int status;
1803
1804 fflush(NULL);
1805 pid = fork();
1806 if (pid < 0)
1807 die("unable to fork");
1808 if (!pid) {
1809 execvp(pgm, (char *const*) arg);
1810 exit(255);
1811 }
1812
1813 while (waitpid(pid, &status, 0) < 0) {
1814 if (errno == EINTR)
1815 continue;
1816 return -1;
1817 }
1818
1819 /* Earlier we did not check the exit status because
1820 * diff exits non-zero if files are different, and
1821 * we are not interested in knowing that. It was a
1822 * mistake which made it harder to quit a diff-*
1823 * session that uses the git-apply-patch-script as
1824 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1825 * should also exit non-zero only when it wants to
1826 * abort the entire diff-* session.
1827 */
1828 if (WIFEXITED(status) && !WEXITSTATUS(status))
1829 return 0;
1830 return -1;
1831 }
1832
1833 /* An external diff command takes:
1834 *
1835 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1836 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1837 *
1838 */
1839 static void run_external_diff(const char *pgm,
1840 const char *name,
1841 const char *other,
1842 struct diff_filespec *one,
1843 struct diff_filespec *two,
1844 const char *xfrm_msg,
1845 int complete_rewrite)
1846 {
1847 const char *spawn_arg[10];
1848 struct diff_tempfile *temp = diff_temp;
1849 int retval;
1850 static int atexit_asked = 0;
1851 const char *othername;
1852 const char **arg = &spawn_arg[0];
1853
1854 othername = (other? other : name);
1855 if (one && two) {
1856 prepare_temp_file(name, &temp[0], one);
1857 prepare_temp_file(othername, &temp[1], two);
1858 if (! atexit_asked &&
1859 (temp[0].name == temp[0].tmp_path ||
1860 temp[1].name == temp[1].tmp_path)) {
1861 atexit_asked = 1;
1862 atexit(remove_tempfile);
1863 }
1864 signal(SIGINT, remove_tempfile_on_signal);
1865 }
1866
1867 if (one && two) {
1868 *arg++ = pgm;
1869 *arg++ = name;
1870 *arg++ = temp[0].name;
1871 *arg++ = temp[0].hex;
1872 *arg++ = temp[0].mode;
1873 *arg++ = temp[1].name;
1874 *arg++ = temp[1].hex;
1875 *arg++ = temp[1].mode;
1876 if (other) {
1877 *arg++ = other;
1878 *arg++ = xfrm_msg;
1879 }
1880 } else {
1881 *arg++ = pgm;
1882 *arg++ = name;
1883 }
1884 *arg = NULL;
1885 retval = spawn_prog(pgm, spawn_arg);
1886 remove_tempfile();
1887 if (retval) {
1888 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1889 exit(1);
1890 }
1891 }
1892
1893 static const char *external_diff_attr(const char *name)
1894 {
1895 struct git_attr_check attr_diff_check;
1896
1897 setup_diff_attr_check(&attr_diff_check);
1898 if (!git_checkattr(name, 1, &attr_diff_check)) {
1899 const char *value = attr_diff_check.value;
1900 if (!ATTR_TRUE(value) &&
1901 !ATTR_FALSE(value) &&
1902 !ATTR_UNSET(value)) {
1903 struct ll_diff_driver *drv;
1904
1905 read_config_if_needed();
1906 for (drv = user_diff; drv; drv = drv->next)
1907 if (!strcmp(drv->name, value))
1908 return drv->cmd;
1909 }
1910 }
1911 return NULL;
1912 }
1913
1914 static void run_diff_cmd(const char *pgm,
1915 const char *name,
1916 const char *other,
1917 struct diff_filespec *one,
1918 struct diff_filespec *two,
1919 const char *xfrm_msg,
1920 struct diff_options *o,
1921 int complete_rewrite)
1922 {
1923 if (!o->allow_external)
1924 pgm = NULL;
1925 else {
1926 const char *cmd = external_diff_attr(name);
1927 if (cmd)
1928 pgm = cmd;
1929 }
1930
1931 if (pgm) {
1932 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1933 complete_rewrite);
1934 return;
1935 }
1936 if (one && two)
1937 builtin_diff(name, other ? other : name,
1938 one, two, xfrm_msg, o, complete_rewrite);
1939 else
1940 printf("* Unmerged path %s\n", name);
1941 }
1942
1943 static void diff_fill_sha1_info(struct diff_filespec *one)
1944 {
1945 if (DIFF_FILE_VALID(one)) {
1946 if (!one->sha1_valid) {
1947 struct stat st;
1948 if (!strcmp(one->path, "-")) {
1949 hashcpy(one->sha1, null_sha1);
1950 return;
1951 }
1952 if (lstat(one->path, &st) < 0)
1953 die("stat %s", one->path);
1954 if (index_path(one->sha1, one->path, &st, 0))
1955 die("cannot hash %s\n", one->path);
1956 }
1957 }
1958 else
1959 hashclr(one->sha1);
1960 }
1961
1962 static int similarity_index(struct diff_filepair *p)
1963 {
1964 return p->score * 100 / MAX_SCORE;
1965 }
1966
1967 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1968 {
1969 const char *pgm = external_diff();
1970 char msg[PATH_MAX*2+300], *xfrm_msg;
1971 struct diff_filespec *one;
1972 struct diff_filespec *two;
1973 const char *name;
1974 const char *other;
1975 char *name_munged, *other_munged;
1976 int complete_rewrite = 0;
1977 int len;
1978
1979 if (DIFF_PAIR_UNMERGED(p)) {
1980 /* unmerged */
1981 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1982 return;
1983 }
1984
1985 name = p->one->path;
1986 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1987 name_munged = quote_one(name);
1988 other_munged = quote_one(other);
1989 one = p->one; two = p->two;
1990
1991 diff_fill_sha1_info(one);
1992 diff_fill_sha1_info(two);
1993
1994 len = 0;
1995 switch (p->status) {
1996 case DIFF_STATUS_COPIED:
1997 len += snprintf(msg + len, sizeof(msg) - len,
1998 "similarity index %d%%\n"
1999 "copy from %s\n"
2000 "copy to %s\n",
2001 similarity_index(p), name_munged, other_munged);
2002 break;
2003 case DIFF_STATUS_RENAMED:
2004 len += snprintf(msg + len, sizeof(msg) - len,
2005 "similarity index %d%%\n"
2006 "rename from %s\n"
2007 "rename to %s\n",
2008 similarity_index(p), name_munged, other_munged);
2009 break;
2010 case DIFF_STATUS_MODIFIED:
2011 if (p->score) {
2012 len += snprintf(msg + len, sizeof(msg) - len,
2013 "dissimilarity index %d%%\n",
2014 similarity_index(p));
2015 complete_rewrite = 1;
2016 break;
2017 }
2018 /* fallthru */
2019 default:
2020 /* nothing */
2021 ;
2022 }
2023
2024 if (hashcmp(one->sha1, two->sha1)) {
2025 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
2026
2027 if (o->binary) {
2028 mmfile_t mf;
2029 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2030 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2031 abbrev = 40;
2032 }
2033 len += snprintf(msg + len, sizeof(msg) - len,
2034 "index %.*s..%.*s",
2035 abbrev, sha1_to_hex(one->sha1),
2036 abbrev, sha1_to_hex(two->sha1));
2037 if (one->mode == two->mode)
2038 len += snprintf(msg + len, sizeof(msg) - len,
2039 " %06o", one->mode);
2040 len += snprintf(msg + len, sizeof(msg) - len, "\n");
2041 }
2042
2043 if (len)
2044 msg[--len] = 0;
2045 xfrm_msg = len ? msg : NULL;
2046
2047 if (!pgm &&
2048 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2049 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2050 /* a filepair that changes between file and symlink
2051 * needs to be split into deletion and creation.
2052 */
2053 struct diff_filespec *null = alloc_filespec(two->path);
2054 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
2055 free(null);
2056 null = alloc_filespec(one->path);
2057 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
2058 free(null);
2059 }
2060 else
2061 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
2062 complete_rewrite);
2063
2064 free(name_munged);
2065 free(other_munged);
2066 }
2067
2068 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2069 struct diffstat_t *diffstat)
2070 {
2071 const char *name;
2072 const char *other;
2073 int complete_rewrite = 0;
2074
2075 if (DIFF_PAIR_UNMERGED(p)) {
2076 /* unmerged */
2077 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2078 return;
2079 }
2080
2081 name = p->one->path;
2082 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2083
2084 diff_fill_sha1_info(p->one);
2085 diff_fill_sha1_info(p->two);
2086
2087 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2088 complete_rewrite = 1;
2089 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2090 }
2091
2092 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2093 {
2094 const char *name;
2095 const char *other;
2096
2097 if (DIFF_PAIR_UNMERGED(p)) {
2098 /* unmerged */
2099 return;
2100 }
2101
2102 name = p->one->path;
2103 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2104
2105 diff_fill_sha1_info(p->one);
2106 diff_fill_sha1_info(p->two);
2107
2108 builtin_checkdiff(name, other, p->one, p->two, o);
2109 }
2110
2111 void diff_setup(struct diff_options *options)
2112 {
2113 memset(options, 0, sizeof(*options));
2114 options->line_termination = '\n';
2115 options->break_opt = -1;
2116 options->rename_limit = -1;
2117 options->context = 3;
2118 options->msg_sep = "";
2119
2120 options->change = diff_change;
2121 options->add_remove = diff_addremove;
2122 options->color_diff = diff_use_color_default;
2123 options->detect_rename = diff_detect_rename_default;
2124 }
2125
2126 int diff_setup_done(struct diff_options *options)
2127 {
2128 int count = 0;
2129
2130 if (options->output_format & DIFF_FORMAT_NAME)
2131 count++;
2132 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2133 count++;
2134 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2135 count++;
2136 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2137 count++;
2138 if (count > 1)
2139 die("--name-only, --name-status, --check and -s are mutually exclusive");
2140
2141 if (options->find_copies_harder)
2142 options->detect_rename = DIFF_DETECT_COPY;
2143
2144 if (options->output_format & (DIFF_FORMAT_NAME |
2145 DIFF_FORMAT_NAME_STATUS |
2146 DIFF_FORMAT_CHECKDIFF |
2147 DIFF_FORMAT_NO_OUTPUT))
2148 options->output_format &= ~(DIFF_FORMAT_RAW |
2149 DIFF_FORMAT_NUMSTAT |
2150 DIFF_FORMAT_DIFFSTAT |
2151 DIFF_FORMAT_SHORTSTAT |
2152 DIFF_FORMAT_SUMMARY |
2153 DIFF_FORMAT_PATCH);
2154
2155 /*
2156 * These cases always need recursive; we do not drop caller-supplied
2157 * recursive bits for other formats here.
2158 */
2159 if (options->output_format & (DIFF_FORMAT_PATCH |
2160 DIFF_FORMAT_NUMSTAT |
2161 DIFF_FORMAT_DIFFSTAT |
2162 DIFF_FORMAT_SHORTSTAT |
2163 DIFF_FORMAT_SUMMARY |
2164 DIFF_FORMAT_CHECKDIFF))
2165 options->recursive = 1;
2166 /*
2167 * Also pickaxe would not work very well if you do not say recursive
2168 */
2169 if (options->pickaxe)
2170 options->recursive = 1;
2171
2172 if (options->detect_rename && options->rename_limit < 0)
2173 options->rename_limit = diff_rename_limit_default;
2174 if (options->setup & DIFF_SETUP_USE_CACHE) {
2175 if (!active_cache)
2176 /* read-cache does not die even when it fails
2177 * so it is safe for us to do this here. Also
2178 * it does not smudge active_cache or active_nr
2179 * when it fails, so we do not have to worry about
2180 * cleaning it up ourselves either.
2181 */
2182 read_cache();
2183 }
2184 if (options->abbrev <= 0 || 40 < options->abbrev)
2185 options->abbrev = 40; /* full */
2186
2187 /*
2188 * It does not make sense to show the first hit we happened
2189 * to have found. It does not make sense not to return with
2190 * exit code in such a case either.
2191 */
2192 if (options->quiet) {
2193 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2194 options->exit_with_status = 1;
2195 }
2196
2197 /*
2198 * If we postprocess in diffcore, we cannot simply return
2199 * upon the first hit. We need to run diff as usual.
2200 */
2201 if (options->pickaxe || options->filter)
2202 options->quiet = 0;
2203
2204 return 0;
2205 }
2206
2207 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2208 {
2209 char c, *eq;
2210 int len;
2211
2212 if (*arg != '-')
2213 return 0;
2214 c = *++arg;
2215 if (!c)
2216 return 0;
2217 if (c == arg_short) {
2218 c = *++arg;
2219 if (!c)
2220 return 1;
2221 if (val && isdigit(c)) {
2222 char *end;
2223 int n = strtoul(arg, &end, 10);
2224 if (*end)
2225 return 0;
2226 *val = n;
2227 return 1;
2228 }
2229 return 0;
2230 }
2231 if (c != '-')
2232 return 0;
2233 arg++;
2234 eq = strchr(arg, '=');
2235 if (eq)
2236 len = eq - arg;
2237 else
2238 len = strlen(arg);
2239 if (!len || strncmp(arg, arg_long, len))
2240 return 0;
2241 if (eq) {
2242 int n;
2243 char *end;
2244 if (!isdigit(*++eq))
2245 return 0;
2246 n = strtoul(eq, &end, 10);
2247 if (*end)
2248 return 0;
2249 *val = n;
2250 }
2251 return 1;
2252 }
2253
2254 static int diff_scoreopt_parse(const char *opt);
2255
2256 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2257 {
2258 const char *arg = av[0];
2259 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2260 options->output_format |= DIFF_FORMAT_PATCH;
2261 else if (opt_arg(arg, 'U', "unified", &options->context))
2262 options->output_format |= DIFF_FORMAT_PATCH;
2263 else if (!strcmp(arg, "--raw"))
2264 options->output_format |= DIFF_FORMAT_RAW;
2265 else if (!strcmp(arg, "--patch-with-raw")) {
2266 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2267 }
2268 else if (!strcmp(arg, "--numstat")) {
2269 options->output_format |= DIFF_FORMAT_NUMSTAT;
2270 }
2271 else if (!strcmp(arg, "--shortstat")) {
2272 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2273 }
2274 else if (!prefixcmp(arg, "--stat")) {
2275 char *end;
2276 int width = options->stat_width;
2277 int name_width = options->stat_name_width;
2278 arg += 6;
2279 end = (char *)arg;
2280
2281 switch (*arg) {
2282 case '-':
2283 if (!prefixcmp(arg, "-width="))
2284 width = strtoul(arg + 7, &end, 10);
2285 else if (!prefixcmp(arg, "-name-width="))
2286 name_width = strtoul(arg + 12, &end, 10);
2287 break;
2288 case '=':
2289 width = strtoul(arg+1, &end, 10);
2290 if (*end == ',')
2291 name_width = strtoul(end+1, &end, 10);
2292 }
2293
2294 /* Important! This checks all the error cases! */
2295 if (*end)
2296 return 0;
2297 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2298 options->stat_name_width = name_width;
2299 options->stat_width = width;
2300 }
2301 else if (!strcmp(arg, "--check"))
2302 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2303 else if (!strcmp(arg, "--summary"))
2304 options->output_format |= DIFF_FORMAT_SUMMARY;
2305 else if (!strcmp(arg, "--patch-with-stat")) {
2306 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2307 }
2308 else if (!strcmp(arg, "-z"))
2309 options->line_termination = 0;
2310 else if (!prefixcmp(arg, "-l"))
2311 options->rename_limit = strtoul(arg+2, NULL, 10);
2312 else if (!strcmp(arg, "--full-index"))
2313 options->full_index = 1;
2314 else if (!strcmp(arg, "--binary")) {
2315 options->output_format |= DIFF_FORMAT_PATCH;
2316 options->binary = 1;
2317 }
2318 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
2319 options->text = 1;
2320 }
2321 else if (!strcmp(arg, "--name-only"))
2322 options->output_format |= DIFF_FORMAT_NAME;
2323 else if (!strcmp(arg, "--name-status"))
2324 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2325 else if (!strcmp(arg, "-R"))
2326 options->reverse_diff = 1;
2327 else if (!prefixcmp(arg, "-S"))
2328 options->pickaxe = arg + 2;
2329 else if (!strcmp(arg, "-s")) {
2330 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2331 }
2332 else if (!prefixcmp(arg, "-O"))
2333 options->orderfile = arg + 2;
2334 else if (!prefixcmp(arg, "--diff-filter="))
2335 options->filter = arg + 14;
2336 else if (!strcmp(arg, "--pickaxe-all"))
2337 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2338 else if (!strcmp(arg, "--pickaxe-regex"))
2339 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2340 else if (!prefixcmp(arg, "-B")) {
2341 if ((options->break_opt =
2342 diff_scoreopt_parse(arg)) == -1)
2343 return -1;
2344 }
2345 else if (!prefixcmp(arg, "-M")) {
2346 if ((options->rename_score =
2347 diff_scoreopt_parse(arg)) == -1)
2348 return -1;
2349 options->detect_rename = DIFF_DETECT_RENAME;
2350 }
2351 else if (!prefixcmp(arg, "-C")) {
2352 if (options->detect_rename == DIFF_DETECT_COPY)
2353 options->find_copies_harder = 1;
2354 if ((options->rename_score =
2355 diff_scoreopt_parse(arg)) == -1)
2356 return -1;
2357 options->detect_rename = DIFF_DETECT_COPY;
2358 }
2359 else if (!strcmp(arg, "--find-copies-harder"))
2360 options->find_copies_harder = 1;
2361 else if (!strcmp(arg, "--follow"))
2362 options->follow_renames = 1;
2363 else if (!strcmp(arg, "--abbrev"))
2364 options->abbrev = DEFAULT_ABBREV;
2365 else if (!prefixcmp(arg, "--abbrev=")) {
2366 options->abbrev = strtoul(arg + 9, NULL, 10);
2367 if (options->abbrev < MINIMUM_ABBREV)
2368 options->abbrev = MINIMUM_ABBREV;
2369 else if (40 < options->abbrev)
2370 options->abbrev = 40;
2371 }
2372 else if (!strcmp(arg, "--color"))
2373 options->color_diff = 1;
2374 else if (!strcmp(arg, "--no-color"))
2375 options->color_diff = 0;
2376 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2377 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2378 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2379 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2380 else if (!strcmp(arg, "--ignore-space-at-eol"))
2381 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2382 else if (!strcmp(arg, "--color-words"))
2383 options->color_diff = options->color_diff_words = 1;
2384 else if (!strcmp(arg, "--no-renames"))
2385 options->detect_rename = 0;
2386 else if (!strcmp(arg, "--exit-code"))
2387 options->exit_with_status = 1;
2388 else if (!strcmp(arg, "--quiet"))
2389 options->quiet = 1;
2390 else if (!strcmp(arg, "--ext-diff"))
2391 options->allow_external = 1;
2392 else if (!strcmp(arg, "--no-ext-diff"))
2393 options->allow_external = 0;
2394 else
2395 return 0;
2396 return 1;
2397 }
2398
2399 static int parse_num(const char **cp_p)
2400 {
2401 unsigned long num, scale;
2402 int ch, dot;
2403 const char *cp = *cp_p;
2404
2405 num = 0;
2406 scale = 1;
2407 dot = 0;
2408 for(;;) {
2409 ch = *cp;
2410 if ( !dot && ch == '.' ) {
2411 scale = 1;
2412 dot = 1;
2413 } else if ( ch == '%' ) {
2414 scale = dot ? scale*100 : 100;
2415 cp++; /* % is always at the end */
2416 break;
2417 } else if ( ch >= '0' && ch <= '9' ) {
2418 if ( scale < 100000 ) {
2419 scale *= 10;
2420 num = (num*10) + (ch-'0');
2421 }
2422 } else {
2423 break;
2424 }
2425 cp++;
2426 }
2427 *cp_p = cp;
2428
2429 /* user says num divided by scale and we say internally that
2430 * is MAX_SCORE * num / scale.
2431 */
2432 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2433 }
2434
2435 static int diff_scoreopt_parse(const char *opt)
2436 {
2437 int opt1, opt2, cmd;
2438
2439 if (*opt++ != '-')
2440 return -1;
2441 cmd = *opt++;
2442 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2443 return -1; /* that is not a -M, -C nor -B option */
2444
2445 opt1 = parse_num(&opt);
2446 if (cmd != 'B')
2447 opt2 = 0;
2448 else {
2449 if (*opt == 0)
2450 opt2 = 0;
2451 else if (*opt != '/')
2452 return -1; /* we expect -B80/99 or -B80 */
2453 else {
2454 opt++;
2455 opt2 = parse_num(&opt);
2456 }
2457 }
2458 if (*opt != 0)
2459 return -1;
2460 return opt1 | (opt2 << 16);
2461 }
2462
2463 struct diff_queue_struct diff_queued_diff;
2464
2465 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2466 {
2467 if (queue->alloc <= queue->nr) {
2468 queue->alloc = alloc_nr(queue->alloc);
2469 queue->queue = xrealloc(queue->queue,
2470 sizeof(dp) * queue->alloc);
2471 }
2472 queue->queue[queue->nr++] = dp;
2473 }
2474
2475 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2476 struct diff_filespec *one,
2477 struct diff_filespec *two)
2478 {
2479 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2480 dp->one = one;
2481 dp->two = two;
2482 if (queue)
2483 diff_q(queue, dp);
2484 return dp;
2485 }
2486
2487 void diff_free_filepair(struct diff_filepair *p)
2488 {
2489 diff_free_filespec_data(p->one);
2490 diff_free_filespec_data(p->two);
2491 free(p->one);
2492 free(p->two);
2493 free(p);
2494 }
2495
2496 /* This is different from find_unique_abbrev() in that
2497 * it stuffs the result with dots for alignment.
2498 */
2499 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2500 {
2501 int abblen;
2502 const char *abbrev;
2503 if (len == 40)
2504 return sha1_to_hex(sha1);
2505
2506 abbrev = find_unique_abbrev(sha1, len);
2507 if (!abbrev)
2508 return sha1_to_hex(sha1);
2509 abblen = strlen(abbrev);
2510 if (abblen < 37) {
2511 static char hex[41];
2512 if (len < abblen && abblen <= len + 2)
2513 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2514 else
2515 sprintf(hex, "%s...", abbrev);
2516 return hex;
2517 }
2518 return sha1_to_hex(sha1);
2519 }
2520
2521 static void diff_flush_raw(struct diff_filepair *p,
2522 struct diff_options *options)
2523 {
2524 int two_paths;
2525 char status[10];
2526 int abbrev = options->abbrev;
2527 const char *path_one, *path_two;
2528 int inter_name_termination = '\t';
2529 int line_termination = options->line_termination;
2530
2531 if (!line_termination)
2532 inter_name_termination = 0;
2533
2534 path_one = p->one->path;
2535 path_two = p->two->path;
2536 if (line_termination) {
2537 path_one = quote_one(path_one);
2538 path_two = quote_one(path_two);
2539 }
2540
2541 if (p->score)
2542 sprintf(status, "%c%03d", p->status, similarity_index(p));
2543 else {
2544 status[0] = p->status;
2545 status[1] = 0;
2546 }
2547 switch (p->status) {
2548 case DIFF_STATUS_COPIED:
2549 case DIFF_STATUS_RENAMED:
2550 two_paths = 1;
2551 break;
2552 case DIFF_STATUS_ADDED:
2553 case DIFF_STATUS_DELETED:
2554 two_paths = 0;
2555 break;
2556 default:
2557 two_paths = 0;
2558 break;
2559 }
2560 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
2561 printf(":%06o %06o %s ",
2562 p->one->mode, p->two->mode,
2563 diff_unique_abbrev(p->one->sha1, abbrev));
2564 printf("%s ",
2565 diff_unique_abbrev(p->two->sha1, abbrev));
2566 }
2567 printf("%s%c%s", status, inter_name_termination,
2568 two_paths || p->one->mode ? path_one : path_two);
2569 if (two_paths)
2570 printf("%c%s", inter_name_termination, path_two);
2571 putchar(line_termination);
2572 if (path_one != p->one->path)
2573 free((void*)path_one);
2574 if (path_two != p->two->path)
2575 free((void*)path_two);
2576 }
2577
2578 static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
2579 {
2580 char *path = p->two->path;
2581
2582 if (opt->line_termination)
2583 path = quote_one(p->two->path);
2584 printf("%s%c", path, opt->line_termination);
2585 if (p->two->path != path)
2586 free(path);
2587 }
2588
2589 int diff_unmodified_pair(struct diff_filepair *p)
2590 {
2591 /* This function is written stricter than necessary to support
2592 * the currently implemented transformers, but the idea is to
2593 * let transformers to produce diff_filepairs any way they want,
2594 * and filter and clean them up here before producing the output.
2595 */
2596 struct diff_filespec *one, *two;
2597
2598 if (DIFF_PAIR_UNMERGED(p))
2599 return 0; /* unmerged is interesting */
2600
2601 one = p->one;
2602 two = p->two;
2603
2604 /* deletion, addition, mode or type change
2605 * and rename are all interesting.
2606 */
2607 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2608 DIFF_PAIR_MODE_CHANGED(p) ||
2609 strcmp(one->path, two->path))
2610 return 0;
2611
2612 /* both are valid and point at the same path. that is, we are
2613 * dealing with a change.
2614 */
2615 if (one->sha1_valid && two->sha1_valid &&
2616 !hashcmp(one->sha1, two->sha1))
2617 return 1; /* no change */
2618 if (!one->sha1_valid && !two->sha1_valid)
2619 return 1; /* both look at the same file on the filesystem. */
2620 return 0;
2621 }
2622
2623 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2624 {
2625 if (diff_unmodified_pair(p))
2626 return;
2627
2628 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2629 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2630 return; /* no tree diffs in patch format */
2631
2632 run_diff(p, o);
2633 }
2634
2635 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2636 struct diffstat_t *diffstat)
2637 {
2638 if (diff_unmodified_pair(p))
2639 return;
2640
2641 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2642 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2643 return; /* no tree diffs in patch format */
2644
2645 run_diffstat(p, o, diffstat);
2646 }
2647
2648 static void diff_flush_checkdiff(struct diff_filepair *p,
2649 struct diff_options *o)
2650 {
2651 if (diff_unmodified_pair(p))
2652 return;
2653
2654 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2655 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2656 return; /* no tree diffs in patch format */
2657
2658 run_checkdiff(p, o);
2659 }
2660
2661 int diff_queue_is_empty(void)
2662 {
2663 struct diff_queue_struct *q = &diff_queued_diff;
2664 int i;
2665 for (i = 0; i < q->nr; i++)
2666 if (!diff_unmodified_pair(q->queue[i]))
2667 return 0;
2668 return 1;
2669 }
2670
2671 #if DIFF_DEBUG
2672 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2673 {
2674 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2675 x, one ? one : "",
2676 s->path,
2677 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2678 s->mode,
2679 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2680 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2681 x, one ? one : "",
2682 s->size, s->xfrm_flags);
2683 }
2684
2685 void diff_debug_filepair(const struct diff_filepair *p, int i)
2686 {
2687 diff_debug_filespec(p->one, i, "one");
2688 diff_debug_filespec(p->two, i, "two");
2689 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2690 p->score, p->status ? p->status : '?',
2691 p->source_stays, p->broken_pair);
2692 }
2693
2694 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2695 {
2696 int i;
2697 if (msg)
2698 fprintf(stderr, "%s\n", msg);
2699 fprintf(stderr, "q->nr = %d\n", q->nr);
2700 for (i = 0; i < q->nr; i++) {
2701 struct diff_filepair *p = q->queue[i];
2702 diff_debug_filepair(p, i);
2703 }
2704 }
2705 #endif
2706
2707 static void diff_resolve_rename_copy(void)
2708 {
2709 int i, j;
2710 struct diff_filepair *p, *pp;
2711 struct diff_queue_struct *q = &diff_queued_diff;
2712
2713 diff_debug_queue("resolve-rename-copy", q);
2714
2715 for (i = 0; i < q->nr; i++) {
2716 p = q->queue[i];
2717 p->status = 0; /* undecided */
2718 if (DIFF_PAIR_UNMERGED(p))
2719 p->status = DIFF_STATUS_UNMERGED;
2720 else if (!DIFF_FILE_VALID(p->one))
2721 p->status = DIFF_STATUS_ADDED;
2722 else if (!DIFF_FILE_VALID(p->two))
2723 p->status = DIFF_STATUS_DELETED;
2724 else if (DIFF_PAIR_TYPE_CHANGED(p))
2725 p->status = DIFF_STATUS_TYPE_CHANGED;
2726
2727 /* from this point on, we are dealing with a pair
2728 * whose both sides are valid and of the same type, i.e.
2729 * either in-place edit or rename/copy edit.
2730 */
2731 else if (DIFF_PAIR_RENAME(p)) {
2732 if (p->source_stays) {
2733 p->status = DIFF_STATUS_COPIED;
2734 continue;
2735 }
2736 /* See if there is some other filepair that
2737 * copies from the same source as us. If so
2738 * we are a copy. Otherwise we are either a
2739 * copy if the path stays, or a rename if it
2740 * does not, but we already handled "stays" case.
2741 */
2742 for (j = i + 1; j < q->nr; j++) {
2743 pp = q->queue[j];
2744 if (strcmp(pp->one->path, p->one->path))
2745 continue; /* not us */
2746 if (!DIFF_PAIR_RENAME(pp))
2747 continue; /* not a rename/copy */
2748 /* pp is a rename/copy from the same source */
2749 p->status = DIFF_STATUS_COPIED;
2750 break;
2751 }
2752 if (!p->status)
2753 p->status = DIFF_STATUS_RENAMED;
2754 }
2755 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2756 p->one->mode != p->two->mode ||
2757 is_null_sha1(p->one->sha1))
2758 p->status = DIFF_STATUS_MODIFIED;
2759 else {
2760 /* This is a "no-change" entry and should not
2761 * happen anymore, but prepare for broken callers.
2762 */
2763 error("feeding unmodified %s to diffcore",
2764 p->one->path);
2765 p->status = DIFF_STATUS_UNKNOWN;
2766 }
2767 }
2768 diff_debug_queue("resolve-rename-copy done", q);
2769 }
2770
2771 static int check_pair_status(struct diff_filepair *p)
2772 {
2773 switch (p->status) {
2774 case DIFF_STATUS_UNKNOWN:
2775 return 0;
2776 case 0:
2777 die("internal error in diff-resolve-rename-copy");
2778 default:
2779 return 1;
2780 }
2781 }
2782
2783 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2784 {
2785 int fmt = opt->output_format;
2786
2787 if (fmt & DIFF_FORMAT_CHECKDIFF)
2788 diff_flush_checkdiff(p, opt);
2789 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2790 diff_flush_raw(p, opt);
2791 else if (fmt & DIFF_FORMAT_NAME)
2792 diff_flush_name(p, opt);
2793 }
2794
2795 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2796 {
2797 char *name = quote_one(fs->path);
2798 if (fs->mode)
2799 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
2800 else
2801 printf(" %s %s\n", newdelete, name);
2802 free(name);
2803 }
2804
2805
2806 static void show_mode_change(struct diff_filepair *p, int show_name)
2807 {
2808 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2809 if (show_name) {
2810 char *name = quote_one(p->two->path);
2811 printf(" mode change %06o => %06o %s\n",
2812 p->one->mode, p->two->mode, name);
2813 free(name);
2814 }
2815 else
2816 printf(" mode change %06o => %06o\n",
2817 p->one->mode, p->two->mode);
2818 }
2819 }
2820
2821 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2822 {
2823 char *names = pprint_rename(p->one->path, p->two->path);
2824
2825 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2826 free(names);
2827 show_mode_change(p, 0);
2828 }
2829
2830 static void diff_summary(struct diff_filepair *p)
2831 {
2832 switch(p->status) {
2833 case DIFF_STATUS_DELETED:
2834 show_file_mode_name("delete", p->one);
2835 break;
2836 case DIFF_STATUS_ADDED:
2837 show_file_mode_name("create", p->two);
2838 break;
2839 case DIFF_STATUS_COPIED:
2840 show_rename_copy("copy", p);
2841 break;
2842 case DIFF_STATUS_RENAMED:
2843 show_rename_copy("rename", p);
2844 break;
2845 default:
2846 if (p->score) {
2847 char *name = quote_one(p->two->path);
2848 printf(" rewrite %s (%d%%)\n", name,
2849 similarity_index(p));
2850 free(name);
2851 show_mode_change(p, 0);
2852 } else show_mode_change(p, 1);
2853 break;
2854 }
2855 }
2856
2857 struct patch_id_t {
2858 struct xdiff_emit_state xm;
2859 SHA_CTX *ctx;
2860 int patchlen;
2861 };
2862
2863 static int remove_space(char *line, int len)
2864 {
2865 int i;
2866 char *dst = line;
2867 unsigned char c;
2868
2869 for (i = 0; i < len; i++)
2870 if (!isspace((c = line[i])))
2871 *dst++ = c;
2872
2873 return dst - line;
2874 }
2875
2876 static void patch_id_consume(void *priv, char *line, unsigned long len)
2877 {
2878 struct patch_id_t *data = priv;
2879 int new_len;
2880
2881 /* Ignore line numbers when computing the SHA1 of the patch */
2882 if (!prefixcmp(line, "@@ -"))
2883 return;
2884
2885 new_len = remove_space(line, len);
2886
2887 SHA1_Update(data->ctx, line, new_len);
2888 data->patchlen += new_len;
2889 }
2890
2891 /* returns 0 upon success, and writes result into sha1 */
2892 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2893 {
2894 struct diff_queue_struct *q = &diff_queued_diff;
2895 int i;
2896 SHA_CTX ctx;
2897 struct patch_id_t data;
2898 char buffer[PATH_MAX * 4 + 20];
2899
2900 SHA1_Init(&ctx);
2901 memset(&data, 0, sizeof(struct patch_id_t));
2902 data.ctx = &ctx;
2903 data.xm.consume = patch_id_consume;
2904
2905 for (i = 0; i < q->nr; i++) {
2906 xpparam_t xpp;
2907 xdemitconf_t xecfg;
2908 xdemitcb_t ecb;
2909 mmfile_t mf1, mf2;
2910 struct diff_filepair *p = q->queue[i];
2911 int len1, len2;
2912
2913 memset(&xecfg, 0, sizeof(xecfg));
2914 if (p->status == 0)
2915 return error("internal diff status error");
2916 if (p->status == DIFF_STATUS_UNKNOWN)
2917 continue;
2918 if (diff_unmodified_pair(p))
2919 continue;
2920 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2921 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2922 continue;
2923 if (DIFF_PAIR_UNMERGED(p))
2924 continue;
2925
2926 diff_fill_sha1_info(p->one);
2927 diff_fill_sha1_info(p->two);
2928 if (fill_mmfile(&mf1, p->one) < 0 ||
2929 fill_mmfile(&mf2, p->two) < 0)
2930 return error("unable to read files to diff");
2931
2932 len1 = remove_space(p->one->path, strlen(p->one->path));
2933 len2 = remove_space(p->two->path, strlen(p->two->path));
2934 if (p->one->mode == 0)
2935 len1 = snprintf(buffer, sizeof(buffer),
2936 "diff--gita/%.*sb/%.*s"
2937 "newfilemode%06o"
2938 "---/dev/null"
2939 "+++b/%.*s",
2940 len1, p->one->path,
2941 len2, p->two->path,
2942 p->two->mode,
2943 len2, p->two->path);
2944 else if (p->two->mode == 0)
2945 len1 = snprintf(buffer, sizeof(buffer),
2946 "diff--gita/%.*sb/%.*s"
2947 "deletedfilemode%06o"
2948 "---a/%.*s"
2949 "+++/dev/null",
2950 len1, p->one->path,
2951 len2, p->two->path,
2952 p->one->mode,
2953 len1, p->one->path);
2954 else
2955 len1 = snprintf(buffer, sizeof(buffer),
2956 "diff--gita/%.*sb/%.*s"
2957 "---a/%.*s"
2958 "+++b/%.*s",
2959 len1, p->one->path,
2960 len2, p->two->path,
2961 len1, p->one->path,
2962 len2, p->two->path);
2963 SHA1_Update(&ctx, buffer, len1);
2964
2965 xpp.flags = XDF_NEED_MINIMAL;
2966 xecfg.ctxlen = 3;
2967 xecfg.flags = XDL_EMIT_FUNCNAMES;
2968 ecb.outf = xdiff_outf;
2969 ecb.priv = &data;
2970 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2971 }
2972
2973 SHA1_Final(sha1, &ctx);
2974 return 0;
2975 }
2976
2977 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2978 {
2979 struct diff_queue_struct *q = &diff_queued_diff;
2980 int i;
2981 int result = diff_get_patch_id(options, sha1);
2982
2983 for (i = 0; i < q->nr; i++)
2984 diff_free_filepair(q->queue[i]);
2985
2986 free(q->queue);
2987 q->queue = NULL;
2988 q->nr = q->alloc = 0;
2989
2990 return result;
2991 }
2992
2993 static int is_summary_empty(const struct diff_queue_struct *q)
2994 {
2995 int i;
2996
2997 for (i = 0; i < q->nr; i++) {
2998 const struct diff_filepair *p = q->queue[i];
2999
3000 switch (p->status) {
3001 case DIFF_STATUS_DELETED:
3002 case DIFF_STATUS_ADDED:
3003 case DIFF_STATUS_COPIED:
3004 case DIFF_STATUS_RENAMED:
3005 return 0;
3006 default:
3007 if (p->score)
3008 return 0;
3009 if (p->one->mode && p->two->mode &&
3010 p->one->mode != p->two->mode)
3011 return 0;
3012 break;
3013 }
3014 }
3015 return 1;
3016 }
3017
3018 void diff_flush(struct diff_options *options)
3019 {
3020 struct diff_queue_struct *q = &diff_queued_diff;
3021 int i, output_format = options->output_format;
3022 int separator = 0;
3023
3024 /*
3025 * Order: raw, stat, summary, patch
3026 * or: name/name-status/checkdiff (other bits clear)
3027 */
3028 if (!q->nr)
3029 goto free_queue;
3030
3031 if (output_format & (DIFF_FORMAT_RAW |
3032 DIFF_FORMAT_NAME |
3033 DIFF_FORMAT_NAME_STATUS |
3034 DIFF_FORMAT_CHECKDIFF)) {
3035 for (i = 0; i < q->nr; i++) {
3036 struct diff_filepair *p = q->queue[i];
3037 if (check_pair_status(p))
3038 flush_one_pair(p, options);
3039 }
3040 separator++;
3041 }
3042
3043 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3044 struct diffstat_t diffstat;
3045
3046 memset(&diffstat, 0, sizeof(struct diffstat_t));
3047 diffstat.xm.consume = diffstat_consume;
3048 for (i = 0; i < q->nr; i++) {
3049 struct diff_filepair *p = q->queue[i];
3050 if (check_pair_status(p))
3051 diff_flush_stat(p, options, &diffstat);
3052 }
3053 if (output_format & DIFF_FORMAT_NUMSTAT)
3054 show_numstat(&diffstat, options);
3055 if (output_format & DIFF_FORMAT_DIFFSTAT)
3056 show_stats(&diffstat, options);
3057 else if (output_format & DIFF_FORMAT_SHORTSTAT)
3058 show_shortstats(&diffstat);
3059 separator++;
3060 }
3061
3062 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3063 for (i = 0; i < q->nr; i++)
3064 diff_summary(q->queue[i]);
3065 separator++;
3066 }
3067
3068 if (output_format & DIFF_FORMAT_PATCH) {
3069 if (separator) {
3070 if (options->stat_sep) {
3071 /* attach patch instead of inline */
3072 fputs(options->stat_sep, stdout);
3073 } else {
3074 putchar(options->line_termination);
3075 }
3076 }
3077
3078 for (i = 0; i < q->nr; i++) {
3079 struct diff_filepair *p = q->queue[i];
3080 if (check_pair_status(p))
3081 diff_flush_patch(p, options);
3082 }
3083 }
3084
3085 if (output_format & DIFF_FORMAT_CALLBACK)
3086 options->format_callback(q, options, options->format_callback_data);
3087
3088 for (i = 0; i < q->nr; i++)
3089 diff_free_filepair(q->queue[i]);
3090 free_queue:
3091 free(q->queue);
3092 q->queue = NULL;
3093 q->nr = q->alloc = 0;
3094 }
3095
3096 static void diffcore_apply_filter(const char *filter)
3097 {
3098 int i;
3099 struct diff_queue_struct *q = &diff_queued_diff;
3100 struct diff_queue_struct outq;
3101 outq.queue = NULL;
3102 outq.nr = outq.alloc = 0;
3103
3104 if (!filter)
3105 return;
3106
3107 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3108 int found;
3109 for (i = found = 0; !found && i < q->nr; i++) {
3110 struct diff_filepair *p = q->queue[i];
3111 if (((p->status == DIFF_STATUS_MODIFIED) &&
3112 ((p->score &&
3113 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3114 (!p->score &&
3115 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3116 ((p->status != DIFF_STATUS_MODIFIED) &&
3117 strchr(filter, p->status)))
3118 found++;
3119 }
3120 if (found)
3121 return;
3122
3123 /* otherwise we will clear the whole queue
3124 * by copying the empty outq at the end of this
3125 * function, but first clear the current entries
3126 * in the queue.
3127 */
3128 for (i = 0; i < q->nr; i++)
3129 diff_free_filepair(q->queue[i]);
3130 }
3131 else {
3132 /* Only the matching ones */
3133 for (i = 0; i < q->nr; i++) {
3134 struct diff_filepair *p = q->queue[i];
3135
3136 if (((p->status == DIFF_STATUS_MODIFIED) &&
3137 ((p->score &&
3138 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3139 (!p->score &&
3140 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3141 ((p->status != DIFF_STATUS_MODIFIED) &&
3142 strchr(filter, p->status)))
3143 diff_q(&outq, p);
3144 else
3145 diff_free_filepair(p);
3146 }
3147 }
3148 free(q->queue);
3149 *q = outq;
3150 }
3151
3152 /* Check whether two filespecs with the same mode and size are identical */
3153 static int diff_filespec_is_identical(struct diff_filespec *one,
3154 struct diff_filespec *two)
3155 {
3156 if (S_ISGITLINK(one->mode)) {
3157 diff_fill_sha1_info(one);
3158 diff_fill_sha1_info(two);
3159 return !hashcmp(one->sha1, two->sha1);
3160 }
3161 if (diff_populate_filespec(one, 0))
3162 return 0;
3163 if (diff_populate_filespec(two, 0))
3164 return 0;
3165 return !memcmp(one->data, two->data, one->size);
3166 }
3167
3168 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3169 {
3170 int i;
3171 struct diff_queue_struct *q = &diff_queued_diff;
3172 struct diff_queue_struct outq;
3173 outq.queue = NULL;
3174 outq.nr = outq.alloc = 0;
3175
3176 for (i = 0; i < q->nr; i++) {
3177 struct diff_filepair *p = q->queue[i];
3178
3179 /*
3180 * 1. Entries that come from stat info dirtyness
3181 * always have both sides (iow, not create/delete),
3182 * one side of the object name is unknown, with
3183 * the same mode and size. Keep the ones that
3184 * do not match these criteria. They have real
3185 * differences.
3186 *
3187 * 2. At this point, the file is known to be modified,
3188 * with the same mode and size, and the object
3189 * name of one side is unknown. Need to inspect
3190 * the identical contents.
3191 */
3192 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3193 !DIFF_FILE_VALID(p->two) ||
3194 (p->one->sha1_valid && p->two->sha1_valid) ||
3195 (p->one->mode != p->two->mode) ||
3196 diff_populate_filespec(p->one, 1) ||
3197 diff_populate_filespec(p->two, 1) ||
3198 (p->one->size != p->two->size) ||
3199 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3200 diff_q(&outq, p);
3201 else {
3202 /*
3203 * The caller can subtract 1 from skip_stat_unmatch
3204 * to determine how many paths were dirty only
3205 * due to stat info mismatch.
3206 */
3207 if (!diffopt->no_index)
3208 diffopt->skip_stat_unmatch++;
3209 diff_free_filepair(p);
3210 }
3211 }
3212 free(q->queue);
3213 *q = outq;
3214 }
3215
3216 void diffcore_std(struct diff_options *options)
3217 {
3218 if (options->quiet)
3219 return;
3220
3221 if (options->skip_stat_unmatch && !options->find_copies_harder)
3222 diffcore_skip_stat_unmatch(options);
3223 if (options->break_opt != -1)
3224 diffcore_break(options->break_opt);
3225 if (options->detect_rename)
3226 diffcore_rename(options);
3227 if (options->break_opt != -1)
3228 diffcore_merge_broken();
3229 if (options->pickaxe)
3230 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3231 if (options->orderfile)
3232 diffcore_order(options->orderfile);
3233 diff_resolve_rename_copy();
3234 diffcore_apply_filter(options->filter);
3235
3236 options->has_changes = !!diff_queued_diff.nr;
3237 }
3238
3239
3240 void diff_addremove(struct diff_options *options,
3241 int addremove, unsigned mode,
3242 const unsigned char *sha1,
3243 const char *base, const char *path)
3244 {
3245 char concatpath[PATH_MAX];
3246 struct diff_filespec *one, *two;
3247
3248 /* This may look odd, but it is a preparation for
3249 * feeding "there are unchanged files which should
3250 * not produce diffs, but when you are doing copy
3251 * detection you would need them, so here they are"
3252 * entries to the diff-core. They will be prefixed
3253 * with something like '=' or '*' (I haven't decided
3254 * which but should not make any difference).
3255 * Feeding the same new and old to diff_change()
3256 * also has the same effect.
3257 * Before the final output happens, they are pruned after
3258 * merged into rename/copy pairs as appropriate.
3259 */
3260 if (options->reverse_diff)
3261 addremove = (addremove == '+' ? '-' :
3262 addremove == '-' ? '+' : addremove);
3263
3264 if (!path) path = "";
3265 sprintf(concatpath, "%s%s", base, path);
3266 one = alloc_filespec(concatpath);
3267 two = alloc_filespec(concatpath);
3268
3269 if (addremove != '+')
3270 fill_filespec(one, sha1, mode);
3271 if (addremove != '-')
3272 fill_filespec(two, sha1, mode);
3273
3274 diff_queue(&diff_queued_diff, one, two);
3275 options->has_changes = 1;
3276 }
3277
3278 void diff_change(struct diff_options *options,
3279 unsigned old_mode, unsigned new_mode,
3280 const unsigned char *old_sha1,
3281 const unsigned char *new_sha1,
3282 const char *base, const char *path)
3283 {
3284 char concatpath[PATH_MAX];
3285 struct diff_filespec *one, *two;
3286
3287 if (options->reverse_diff) {
3288 unsigned tmp;
3289 const unsigned char *tmp_c;
3290 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3291 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3292 }
3293 if (!path) path = "";
3294 sprintf(concatpath, "%s%s", base, path);
3295 one = alloc_filespec(concatpath);
3296 two = alloc_filespec(concatpath);
3297 fill_filespec(one, old_sha1, old_mode);
3298 fill_filespec(two, new_sha1, new_mode);
3299
3300 diff_queue(&diff_queued_diff, one, two);
3301 options->has_changes = 1;
3302 }
3303
3304 void diff_unmerge(struct diff_options *options,
3305 const char *path,
3306 unsigned mode, const unsigned char *sha1)
3307 {
3308 struct diff_filespec *one, *two;
3309 one = alloc_filespec(path);
3310 two = alloc_filespec(path);
3311 fill_filespec(one, sha1, mode);
3312 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3313 }
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