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Avoid redundant declaration of missing_target()
[alt-git.git] / diff.c
blob3dd2f35f7364341bcb5f4507ea36d03925fdc938
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13
14 #ifdef NO_FAST_WORKING_DIRECTORY
15 #define FAST_WORKING_DIRECTORY 0
16 #else
17 #define FAST_WORKING_DIRECTORY 1
18 #endif
19
20 static int diff_detect_rename_default;
21 static int diff_rename_limit_default = 100;
22 static int diff_use_color_default;
23 int diff_auto_refresh_index = 1;
24
25 static char diff_colors[][COLOR_MAXLEN] = {
26 "\033[m", /* reset */
27 "", /* PLAIN (normal) */
28 "\033[1m", /* METAINFO (bold) */
29 "\033[36m", /* FRAGINFO (cyan) */
30 "\033[31m", /* OLD (red) */
31 "\033[32m", /* NEW (green) */
32 "\033[33m", /* COMMIT (yellow) */
33 "\033[41m", /* WHITESPACE (red background) */
34 };
35
36 static int parse_diff_color_slot(const char *var, int ofs)
37 {
38 if (!strcasecmp(var+ofs, "plain"))
39 return DIFF_PLAIN;
40 if (!strcasecmp(var+ofs, "meta"))
41 return DIFF_METAINFO;
42 if (!strcasecmp(var+ofs, "frag"))
43 return DIFF_FRAGINFO;
44 if (!strcasecmp(var+ofs, "old"))
45 return DIFF_FILE_OLD;
46 if (!strcasecmp(var+ofs, "new"))
47 return DIFF_FILE_NEW;
48 if (!strcasecmp(var+ofs, "commit"))
49 return DIFF_COMMIT;
50 if (!strcasecmp(var+ofs, "whitespace"))
51 return DIFF_WHITESPACE;
52 die("bad config variable '%s'", var);
53 }
54
55 static struct ll_diff_driver {
56 const char *name;
57 struct ll_diff_driver *next;
58 char *cmd;
59 } *user_diff, **user_diff_tail;
60
61 static void read_config_if_needed(void)
62 {
63 if (!user_diff_tail) {
64 user_diff_tail = &user_diff;
65 git_config(git_diff_ui_config);
66 }
67 }
68
69 /*
70 * Currently there is only "diff.<drivername>.command" variable;
71 * because there are "diff.color.<slot>" variables, we are parsing
72 * this in a bit convoluted way to allow low level diff driver
73 * called "color".
74 */
75 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
76 {
77 const char *name;
78 int namelen;
79 struct ll_diff_driver *drv;
80
81 name = var + 5;
82 namelen = ep - name;
83 for (drv = user_diff; drv; drv = drv->next)
84 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
85 break;
86 if (!drv) {
87 drv = xcalloc(1, sizeof(struct ll_diff_driver));
88 drv->name = xmemdupz(name, namelen);
89 if (!user_diff_tail)
90 user_diff_tail = &user_diff;
91 *user_diff_tail = drv;
92 user_diff_tail = &(drv->next);
93 }
94
95 if (!value)
96 return error("%s: lacks value", var);
97 drv->cmd = strdup(value);
98 return 0;
99 }
100
101 /*
102 * 'diff.<what>.funcname' attribute can be specified in the configuration
103 * to define a customized regexp to find the beginning of a function to
104 * be used for hunk header lines of "diff -p" style output.
105 */
106 static struct funcname_pattern {
107 char *name;
108 char *pattern;
109 struct funcname_pattern *next;
110 } *funcname_pattern_list;
111
112 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
113 {
114 const char *name;
115 int namelen;
116 struct funcname_pattern *pp;
117
118 name = var + 5; /* "diff." */
119 namelen = ep - name;
120
121 for (pp = funcname_pattern_list; pp; pp = pp->next)
122 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
123 break;
124 if (!pp) {
125 pp = xcalloc(1, sizeof(*pp));
126 pp->name = xmemdupz(name, namelen);
127 pp->next = funcname_pattern_list;
128 funcname_pattern_list = pp;
129 }
130 if (pp->pattern)
131 free(pp->pattern);
132 pp->pattern = xstrdup(value);
133 return 0;
134 }
135
136 /*
137 * These are to give UI layer defaults.
138 * The core-level commands such as git-diff-files should
139 * never be affected by the setting of diff.renames
140 * the user happens to have in the configuration file.
141 */
142 int git_diff_ui_config(const char *var, const char *value)
143 {
144 if (!strcmp(var, "diff.renamelimit")) {
145 diff_rename_limit_default = git_config_int(var, value);
146 return 0;
147 }
148 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
149 diff_use_color_default = git_config_colorbool(var, value, -1);
150 return 0;
151 }
152 if (!strcmp(var, "diff.renames")) {
153 if (!value)
154 diff_detect_rename_default = DIFF_DETECT_RENAME;
155 else if (!strcasecmp(value, "copies") ||
156 !strcasecmp(value, "copy"))
157 diff_detect_rename_default = DIFF_DETECT_COPY;
158 else if (git_config_bool(var,value))
159 diff_detect_rename_default = DIFF_DETECT_RENAME;
160 return 0;
161 }
162 if (!strcmp(var, "diff.autorefreshindex")) {
163 diff_auto_refresh_index = git_config_bool(var, value);
164 return 0;
165 }
166 if (!prefixcmp(var, "diff.")) {
167 const char *ep = strrchr(var, '.');
168
169 if (ep != var + 4) {
170 if (!strcmp(ep, ".command"))
171 return parse_lldiff_command(var, ep, value);
172 if (!strcmp(ep, ".funcname"))
173 return parse_funcname_pattern(var, ep, value);
174 }
175 }
176 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
177 int slot = parse_diff_color_slot(var, 11);
178 color_parse(value, var, diff_colors[slot]);
179 return 0;
180 }
181
182 return git_default_config(var, value);
183 }
184
185 static char *quote_two(const char *one, const char *two)
186 {
187 int need_one = quote_c_style(one, NULL, NULL, 1);
188 int need_two = quote_c_style(two, NULL, NULL, 1);
189 struct strbuf res;
190
191 strbuf_init(&res, 0);
192 if (need_one + need_two) {
193 strbuf_addch(&res, '"');
194 quote_c_style(one, &res, NULL, 1);
195 quote_c_style(two, &res, NULL, 1);
196 strbuf_addch(&res, '"');
197 } else {
198 strbuf_addstr(&res, one);
199 strbuf_addstr(&res, two);
200 }
201 return strbuf_detach(&res, NULL);
202 }
203
204 static const char *external_diff(void)
205 {
206 static const char *external_diff_cmd = NULL;
207 static int done_preparing = 0;
208
209 if (done_preparing)
210 return external_diff_cmd;
211 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
212 done_preparing = 1;
213 return external_diff_cmd;
214 }
215
216 static struct diff_tempfile {
217 const char *name; /* filename external diff should read from */
218 char hex[41];
219 char mode[10];
220 char tmp_path[PATH_MAX];
221 } diff_temp[2];
222
223 static int count_lines(const char *data, int size)
224 {
225 int count, ch, completely_empty = 1, nl_just_seen = 0;
226 count = 0;
227 while (0 < size--) {
228 ch = *data++;
229 if (ch == '\n') {
230 count++;
231 nl_just_seen = 1;
232 completely_empty = 0;
233 }
234 else {
235 nl_just_seen = 0;
236 completely_empty = 0;
237 }
238 }
239 if (completely_empty)
240 return 0;
241 if (!nl_just_seen)
242 count++; /* no trailing newline */
243 return count;
244 }
245
246 static void print_line_count(int count)
247 {
248 switch (count) {
249 case 0:
250 printf("0,0");
251 break;
252 case 1:
253 printf("1");
254 break;
255 default:
256 printf("1,%d", count);
257 break;
258 }
259 }
260
261 static void copy_file(int prefix, const char *data, int size,
262 const char *set, const char *reset)
263 {
264 int ch, nl_just_seen = 1;
265 while (0 < size--) {
266 ch = *data++;
267 if (nl_just_seen) {
268 fputs(set, stdout);
269 putchar(prefix);
270 }
271 if (ch == '\n') {
272 nl_just_seen = 1;
273 fputs(reset, stdout);
274 } else
275 nl_just_seen = 0;
276 putchar(ch);
277 }
278 if (!nl_just_seen)
279 printf("%s\n\\ No newline at end of file\n", reset);
280 }
281
282 static void emit_rewrite_diff(const char *name_a,
283 const char *name_b,
284 struct diff_filespec *one,
285 struct diff_filespec *two,
286 int color_diff)
287 {
288 int lc_a, lc_b;
289 const char *name_a_tab, *name_b_tab;
290 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
291 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
292 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
293 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
294 const char *reset = diff_get_color(color_diff, DIFF_RESET);
295
296 name_a += (*name_a == '/');
297 name_b += (*name_b == '/');
298 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
299 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
300
301 diff_populate_filespec(one, 0);
302 diff_populate_filespec(two, 0);
303 lc_a = count_lines(one->data, one->size);
304 lc_b = count_lines(two->data, two->size);
305 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
306 metainfo, name_a, name_a_tab, reset,
307 metainfo, name_b, name_b_tab, reset, fraginfo);
308 print_line_count(lc_a);
309 printf(" +");
310 print_line_count(lc_b);
311 printf(" @@%s\n", reset);
312 if (lc_a)
313 copy_file('-', one->data, one->size, old, reset);
314 if (lc_b)
315 copy_file('+', two->data, two->size, new, reset);
316 }
317
318 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
319 {
320 if (!DIFF_FILE_VALID(one)) {
321 mf->ptr = (char *)""; /* does not matter */
322 mf->size = 0;
323 return 0;
324 }
325 else if (diff_populate_filespec(one, 0))
326 return -1;
327 mf->ptr = one->data;
328 mf->size = one->size;
329 return 0;
330 }
331
332 struct diff_words_buffer {
333 mmfile_t text;
334 long alloc;
335 long current; /* output pointer */
336 int suppressed_newline;
337 };
338
339 static void diff_words_append(char *line, unsigned long len,
340 struct diff_words_buffer *buffer)
341 {
342 if (buffer->text.size + len > buffer->alloc) {
343 buffer->alloc = (buffer->text.size + len) * 3 / 2;
344 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
345 }
346 line++;
347 len--;
348 memcpy(buffer->text.ptr + buffer->text.size, line, len);
349 buffer->text.size += len;
350 }
351
352 struct diff_words_data {
353 struct xdiff_emit_state xm;
354 struct diff_words_buffer minus, plus;
355 };
356
357 static void print_word(struct diff_words_buffer *buffer, int len, int color,
358 int suppress_newline)
359 {
360 const char *ptr;
361 int eol = 0;
362
363 if (len == 0)
364 return;
365
366 ptr = buffer->text.ptr + buffer->current;
367 buffer->current += len;
368
369 if (ptr[len - 1] == '\n') {
370 eol = 1;
371 len--;
372 }
373
374 fputs(diff_get_color(1, color), stdout);
375 fwrite(ptr, len, 1, stdout);
376 fputs(diff_get_color(1, DIFF_RESET), stdout);
377
378 if (eol) {
379 if (suppress_newline)
380 buffer->suppressed_newline = 1;
381 else
382 putchar('\n');
383 }
384 }
385
386 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
387 {
388 struct diff_words_data *diff_words = priv;
389
390 if (diff_words->minus.suppressed_newline) {
391 if (line[0] != '+')
392 putchar('\n');
393 diff_words->minus.suppressed_newline = 0;
394 }
395
396 len--;
397 switch (line[0]) {
398 case '-':
399 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
400 break;
401 case '+':
402 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
403 break;
404 case ' ':
405 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
406 diff_words->minus.current += len;
407 break;
408 }
409 }
410
411 /* this executes the word diff on the accumulated buffers */
412 static void diff_words_show(struct diff_words_data *diff_words)
413 {
414 xpparam_t xpp;
415 xdemitconf_t xecfg;
416 xdemitcb_t ecb;
417 mmfile_t minus, plus;
418 int i;
419
420 memset(&xecfg, 0, sizeof(xecfg));
421 minus.size = diff_words->minus.text.size;
422 minus.ptr = xmalloc(minus.size);
423 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
424 for (i = 0; i < minus.size; i++)
425 if (isspace(minus.ptr[i]))
426 minus.ptr[i] = '\n';
427 diff_words->minus.current = 0;
428
429 plus.size = diff_words->plus.text.size;
430 plus.ptr = xmalloc(plus.size);
431 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
432 for (i = 0; i < plus.size; i++)
433 if (isspace(plus.ptr[i]))
434 plus.ptr[i] = '\n';
435 diff_words->plus.current = 0;
436
437 xpp.flags = XDF_NEED_MINIMAL;
438 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
439 ecb.outf = xdiff_outf;
440 ecb.priv = diff_words;
441 diff_words->xm.consume = fn_out_diff_words_aux;
442 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
443
444 free(minus.ptr);
445 free(plus.ptr);
446 diff_words->minus.text.size = diff_words->plus.text.size = 0;
447
448 if (diff_words->minus.suppressed_newline) {
449 putchar('\n');
450 diff_words->minus.suppressed_newline = 0;
451 }
452 }
453
454 struct emit_callback {
455 struct xdiff_emit_state xm;
456 int nparents, color_diff;
457 unsigned ws_rule;
458 const char **label_path;
459 struct diff_words_data *diff_words;
460 int *found_changesp;
461 };
462
463 static void free_diff_words_data(struct emit_callback *ecbdata)
464 {
465 if (ecbdata->diff_words) {
466 /* flush buffers */
467 if (ecbdata->diff_words->minus.text.size ||
468 ecbdata->diff_words->plus.text.size)
469 diff_words_show(ecbdata->diff_words);
470
471 if (ecbdata->diff_words->minus.text.ptr)
472 free (ecbdata->diff_words->minus.text.ptr);
473 if (ecbdata->diff_words->plus.text.ptr)
474 free (ecbdata->diff_words->plus.text.ptr);
475 free(ecbdata->diff_words);
476 ecbdata->diff_words = NULL;
477 }
478 }
479
480 const char *diff_get_color(int diff_use_color, enum color_diff ix)
481 {
482 if (diff_use_color)
483 return diff_colors[ix];
484 return "";
485 }
486
487 static void emit_line(const char *set, const char *reset, const char *line, int len)
488 {
489 if (len > 0 && line[len-1] == '\n')
490 len--;
491 fputs(set, stdout);
492 fwrite(line, len, 1, stdout);
493 puts(reset);
494 }
495
496 static void emit_line_with_ws(int nparents,
497 const char *set, const char *reset, const char *ws,
498 const char *line, int len, unsigned ws_rule)
499 {
500 int col0 = nparents;
501 int last_tab_in_indent = -1;
502 int last_space_in_indent = -1;
503 int i;
504 int tail = len;
505 int need_highlight_leading_space = 0;
506 /*
507 * The line is a newly added line. Does it have funny leading
508 * whitespaces? In indent, SP should never precede a TAB. In
509 * addition, under "indent with non tab" rule, there should not
510 * be more than 8 consecutive spaces.
511 */
512 for (i = col0; i < len; i++) {
513 if (line[i] == '\t') {
514 last_tab_in_indent = i;
515 if ((ws_rule & WS_SPACE_BEFORE_TAB) &&
516 0 <= last_space_in_indent)
517 need_highlight_leading_space = 1;
518 }
519 else if (line[i] == ' ')
520 last_space_in_indent = i;
521 else
522 break;
523 }
524 if ((ws_rule & WS_INDENT_WITH_NON_TAB) &&
525 0 <= last_space_in_indent &&
526 last_tab_in_indent < 0 &&
527 8 <= (i - col0)) {
528 last_tab_in_indent = i;
529 need_highlight_leading_space = 1;
530 }
531 fputs(set, stdout);
532 fwrite(line, col0, 1, stdout);
533 fputs(reset, stdout);
534 if (((i == len) || line[i] == '\n') && i != col0) {
535 /* The whole line was indent */
536 emit_line(ws, reset, line + col0, len - col0);
537 return;
538 }
539 i = col0;
540 if (need_highlight_leading_space) {
541 while (i < last_tab_in_indent) {
542 if (line[i] == ' ') {
543 fputs(ws, stdout);
544 putchar(' ');
545 fputs(reset, stdout);
546 }
547 else
548 putchar(line[i]);
549 i++;
550 }
551 }
552 tail = len - 1;
553 if (line[tail] == '\n' && i < tail)
554 tail--;
555 if (ws_rule & WS_TRAILING_SPACE) {
556 while (i < tail) {
557 if (!isspace(line[tail]))
558 break;
559 tail--;
560 }
561 }
562 if ((i < tail && line[tail + 1] != '\n')) {
563 /* This has whitespace between tail+1..len */
564 fputs(set, stdout);
565 fwrite(line + i, tail - i + 1, 1, stdout);
566 fputs(reset, stdout);
567 emit_line(ws, reset, line + tail + 1, len - tail - 1);
568 }
569 else
570 emit_line(set, reset, line + i, len - i);
571 }
572
573 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
574 {
575 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
576 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
577
578 if (!*ws)
579 emit_line(set, reset, line, len);
580 else
581 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
582 line, len, ecbdata->ws_rule);
583 }
584
585 static void fn_out_consume(void *priv, char *line, unsigned long len)
586 {
587 int i;
588 int color;
589 struct emit_callback *ecbdata = priv;
590 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
591 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
592
593 *(ecbdata->found_changesp) = 1;
594
595 if (ecbdata->label_path[0]) {
596 const char *name_a_tab, *name_b_tab;
597
598 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
599 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
600
601 printf("%s--- %s%s%s\n",
602 set, ecbdata->label_path[0], reset, name_a_tab);
603 printf("%s+++ %s%s%s\n",
604 set, ecbdata->label_path[1], reset, name_b_tab);
605 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
606 }
607
608 /* This is not really necessary for now because
609 * this codepath only deals with two-way diffs.
610 */
611 for (i = 0; i < len && line[i] == '@'; i++)
612 ;
613 if (2 <= i && i < len && line[i] == ' ') {
614 ecbdata->nparents = i - 1;
615 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
616 reset, line, len);
617 return;
618 }
619
620 if (len < ecbdata->nparents) {
621 set = reset;
622 emit_line(reset, reset, line, len);
623 return;
624 }
625
626 color = DIFF_PLAIN;
627 if (ecbdata->diff_words && ecbdata->nparents != 1)
628 /* fall back to normal diff */
629 free_diff_words_data(ecbdata);
630 if (ecbdata->diff_words) {
631 if (line[0] == '-') {
632 diff_words_append(line, len,
633 &ecbdata->diff_words->minus);
634 return;
635 } else if (line[0] == '+') {
636 diff_words_append(line, len,
637 &ecbdata->diff_words->plus);
638 return;
639 }
640 if (ecbdata->diff_words->minus.text.size ||
641 ecbdata->diff_words->plus.text.size)
642 diff_words_show(ecbdata->diff_words);
643 line++;
644 len--;
645 emit_line(set, reset, line, len);
646 return;
647 }
648 for (i = 0; i < ecbdata->nparents && len; i++) {
649 if (line[i] == '-')
650 color = DIFF_FILE_OLD;
651 else if (line[i] == '+')
652 color = DIFF_FILE_NEW;
653 }
654
655 if (color != DIFF_FILE_NEW) {
656 emit_line(diff_get_color(ecbdata->color_diff, color),
657 reset, line, len);
658 return;
659 }
660 emit_add_line(reset, ecbdata, line, len);
661 }
662
663 static char *pprint_rename(const char *a, const char *b)
664 {
665 const char *old = a;
666 const char *new = b;
667 struct strbuf name;
668 int pfx_length, sfx_length;
669 int len_a = strlen(a);
670 int len_b = strlen(b);
671 int a_midlen, b_midlen;
672 int qlen_a = quote_c_style(a, NULL, NULL, 0);
673 int qlen_b = quote_c_style(b, NULL, NULL, 0);
674
675 strbuf_init(&name, 0);
676 if (qlen_a || qlen_b) {
677 quote_c_style(a, &name, NULL, 0);
678 strbuf_addstr(&name, " => ");
679 quote_c_style(b, &name, NULL, 0);
680 return strbuf_detach(&name, NULL);
681 }
682
683 /* Find common prefix */
684 pfx_length = 0;
685 while (*old && *new && *old == *new) {
686 if (*old == '/')
687 pfx_length = old - a + 1;
688 old++;
689 new++;
690 }
691
692 /* Find common suffix */
693 old = a + len_a;
694 new = b + len_b;
695 sfx_length = 0;
696 while (a <= old && b <= new && *old == *new) {
697 if (*old == '/')
698 sfx_length = len_a - (old - a);
699 old--;
700 new--;
701 }
702
703 /*
704 * pfx{mid-a => mid-b}sfx
705 * {pfx-a => pfx-b}sfx
706 * pfx{sfx-a => sfx-b}
707 * name-a => name-b
708 */
709 a_midlen = len_a - pfx_length - sfx_length;
710 b_midlen = len_b - pfx_length - sfx_length;
711 if (a_midlen < 0)
712 a_midlen = 0;
713 if (b_midlen < 0)
714 b_midlen = 0;
715
716 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
717 if (pfx_length + sfx_length) {
718 strbuf_add(&name, a, pfx_length);
719 strbuf_addch(&name, '{');
720 }
721 strbuf_add(&name, a + pfx_length, a_midlen);
722 strbuf_addstr(&name, " => ");
723 strbuf_add(&name, b + pfx_length, b_midlen);
724 if (pfx_length + sfx_length) {
725 strbuf_addch(&name, '}');
726 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
727 }
728 return strbuf_detach(&name, NULL);
729 }
730
731 struct diffstat_t {
732 struct xdiff_emit_state xm;
733
734 int nr;
735 int alloc;
736 struct diffstat_file {
737 char *from_name;
738 char *name;
739 char *print_name;
740 unsigned is_unmerged:1;
741 unsigned is_binary:1;
742 unsigned is_renamed:1;
743 unsigned int added, deleted;
744 } **files;
745 };
746
747 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
748 const char *name_a,
749 const char *name_b)
750 {
751 struct diffstat_file *x;
752 x = xcalloc(sizeof (*x), 1);
753 if (diffstat->nr == diffstat->alloc) {
754 diffstat->alloc = alloc_nr(diffstat->alloc);
755 diffstat->files = xrealloc(diffstat->files,
756 diffstat->alloc * sizeof(x));
757 }
758 diffstat->files[diffstat->nr++] = x;
759 if (name_b) {
760 x->from_name = xstrdup(name_a);
761 x->name = xstrdup(name_b);
762 x->is_renamed = 1;
763 }
764 else {
765 x->from_name = NULL;
766 x->name = xstrdup(name_a);
767 }
768 return x;
769 }
770
771 static void diffstat_consume(void *priv, char *line, unsigned long len)
772 {
773 struct diffstat_t *diffstat = priv;
774 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
775
776 if (line[0] == '+')
777 x->added++;
778 else if (line[0] == '-')
779 x->deleted++;
780 }
781
782 const char mime_boundary_leader[] = "------------";
783
784 static int scale_linear(int it, int width, int max_change)
785 {
786 /*
787 * make sure that at least one '-' is printed if there were deletions,
788 * and likewise for '+'.
789 */
790 if (max_change < 2)
791 return it;
792 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
793 }
794
795 static void show_name(const char *prefix, const char *name, int len,
796 const char *reset, const char *set)
797 {
798 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
799 }
800
801 static void show_graph(char ch, int cnt, const char *set, const char *reset)
802 {
803 if (cnt <= 0)
804 return;
805 printf("%s", set);
806 while (cnt--)
807 putchar(ch);
808 printf("%s", reset);
809 }
810
811 static void fill_print_name(struct diffstat_file *file)
812 {
813 char *pname;
814
815 if (file->print_name)
816 return;
817
818 if (!file->is_renamed) {
819 struct strbuf buf;
820 strbuf_init(&buf, 0);
821 if (quote_c_style(file->name, &buf, NULL, 0)) {
822 pname = strbuf_detach(&buf, NULL);
823 } else {
824 pname = file->name;
825 strbuf_release(&buf);
826 }
827 } else {
828 pname = pprint_rename(file->from_name, file->name);
829 }
830 file->print_name = pname;
831 }
832
833 static void show_stats(struct diffstat_t* data, struct diff_options *options)
834 {
835 int i, len, add, del, total, adds = 0, dels = 0;
836 int max_change = 0, max_len = 0;
837 int total_files = data->nr;
838 int width, name_width;
839 const char *reset, *set, *add_c, *del_c;
840
841 if (data->nr == 0)
842 return;
843
844 width = options->stat_width ? options->stat_width : 80;
845 name_width = options->stat_name_width ? options->stat_name_width : 50;
846
847 /* Sanity: give at least 5 columns to the graph,
848 * but leave at least 10 columns for the name.
849 */
850 if (width < name_width + 15) {
851 if (name_width <= 25)
852 width = name_width + 15;
853 else
854 name_width = width - 15;
855 }
856
857 /* Find the longest filename and max number of changes */
858 reset = diff_get_color_opt(options, DIFF_RESET);
859 set = diff_get_color_opt(options, DIFF_PLAIN);
860 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
861 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
862
863 for (i = 0; i < data->nr; i++) {
864 struct diffstat_file *file = data->files[i];
865 int change = file->added + file->deleted;
866 fill_print_name(file);
867 len = strlen(file->print_name);
868 if (max_len < len)
869 max_len = len;
870
871 if (file->is_binary || file->is_unmerged)
872 continue;
873 if (max_change < change)
874 max_change = change;
875 }
876
877 /* Compute the width of the graph part;
878 * 10 is for one blank at the beginning of the line plus
879 * " | count " between the name and the graph.
880 *
881 * From here on, name_width is the width of the name area,
882 * and width is the width of the graph area.
883 */
884 name_width = (name_width < max_len) ? name_width : max_len;
885 if (width < (name_width + 10) + max_change)
886 width = width - (name_width + 10);
887 else
888 width = max_change;
889
890 for (i = 0; i < data->nr; i++) {
891 const char *prefix = "";
892 char *name = data->files[i]->print_name;
893 int added = data->files[i]->added;
894 int deleted = data->files[i]->deleted;
895 int name_len;
896
897 /*
898 * "scale" the filename
899 */
900 len = name_width;
901 name_len = strlen(name);
902 if (name_width < name_len) {
903 char *slash;
904 prefix = "...";
905 len -= 3;
906 name += name_len - len;
907 slash = strchr(name, '/');
908 if (slash)
909 name = slash;
910 }
911
912 if (data->files[i]->is_binary) {
913 show_name(prefix, name, len, reset, set);
914 printf(" Bin ");
915 printf("%s%d%s", del_c, deleted, reset);
916 printf(" -> ");
917 printf("%s%d%s", add_c, added, reset);
918 printf(" bytes");
919 printf("\n");
920 continue;
921 }
922 else if (data->files[i]->is_unmerged) {
923 show_name(prefix, name, len, reset, set);
924 printf(" Unmerged\n");
925 continue;
926 }
927 else if (!data->files[i]->is_renamed &&
928 (added + deleted == 0)) {
929 total_files--;
930 continue;
931 }
932
933 /*
934 * scale the add/delete
935 */
936 add = added;
937 del = deleted;
938 total = add + del;
939 adds += add;
940 dels += del;
941
942 if (width <= max_change) {
943 add = scale_linear(add, width, max_change);
944 del = scale_linear(del, width, max_change);
945 total = add + del;
946 }
947 show_name(prefix, name, len, reset, set);
948 printf("%5d ", added + deleted);
949 show_graph('+', add, add_c, reset);
950 show_graph('-', del, del_c, reset);
951 putchar('\n');
952 }
953 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
954 set, total_files, adds, dels, reset);
955 }
956
957 static void show_shortstats(struct diffstat_t* data)
958 {
959 int i, adds = 0, dels = 0, total_files = data->nr;
960
961 if (data->nr == 0)
962 return;
963
964 for (i = 0; i < data->nr; i++) {
965 if (!data->files[i]->is_binary &&
966 !data->files[i]->is_unmerged) {
967 int added = data->files[i]->added;
968 int deleted= data->files[i]->deleted;
969 if (!data->files[i]->is_renamed &&
970 (added + deleted == 0)) {
971 total_files--;
972 } else {
973 adds += added;
974 dels += deleted;
975 }
976 }
977 }
978 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
979 total_files, adds, dels);
980 }
981
982 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
983 {
984 int i;
985
986 if (data->nr == 0)
987 return;
988
989 for (i = 0; i < data->nr; i++) {
990 struct diffstat_file *file = data->files[i];
991
992 if (file->is_binary)
993 printf("-\t-\t");
994 else
995 printf("%d\t%d\t", file->added, file->deleted);
996 if (options->line_termination) {
997 fill_print_name(file);
998 if (!file->is_renamed)
999 write_name_quoted(file->name, stdout,
1000 options->line_termination);
1001 else {
1002 fputs(file->print_name, stdout);
1003 putchar(options->line_termination);
1004 }
1005 } else {
1006 if (file->is_renamed) {
1007 putchar('\0');
1008 write_name_quoted(file->from_name, stdout, '\0');
1009 }
1010 write_name_quoted(file->name, stdout, '\0');
1011 }
1012 }
1013 }
1014
1015 static void free_diffstat_info(struct diffstat_t *diffstat)
1016 {
1017 int i;
1018 for (i = 0; i < diffstat->nr; i++) {
1019 struct diffstat_file *f = diffstat->files[i];
1020 if (f->name != f->print_name)
1021 free(f->print_name);
1022 free(f->name);
1023 free(f->from_name);
1024 free(f);
1025 }
1026 free(diffstat->files);
1027 }
1028
1029 struct checkdiff_t {
1030 struct xdiff_emit_state xm;
1031 const char *filename;
1032 int lineno, color_diff;
1033 unsigned ws_rule;
1034 };
1035
1036 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1037 {
1038 struct checkdiff_t *data = priv;
1039 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1040 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1041 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
1042
1043 if (line[0] == '+') {
1044 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
1045
1046 /* check space before tab */
1047 for (i = 1; i < len; i++) {
1048 if (line[i] == ' ')
1049 spaces++;
1050 else if (line[i] == '\t') {
1051 if (spaces) {
1052 space_before_tab = 1;
1053 break;
1054 }
1055 }
1056 else
1057 break;
1058 }
1059
1060 /* check whitespace at line end */
1061 if (line[len - 1] == '\n')
1062 len--;
1063 if (isspace(line[len - 1]))
1064 white_space_at_end = 1;
1065
1066 if (space_before_tab || white_space_at_end) {
1067 printf("%s:%d: %s", data->filename, data->lineno, ws);
1068 if (space_before_tab) {
1069 printf("space before tab");
1070 if (white_space_at_end)
1071 putchar(',');
1072 }
1073 if (white_space_at_end)
1074 printf("whitespace at end");
1075 printf(":%s ", reset);
1076 emit_line_with_ws(1, set, reset, ws, line, len,
1077 data->ws_rule);
1078 }
1079
1080 data->lineno++;
1081 } else if (line[0] == ' ')
1082 data->lineno++;
1083 else if (line[0] == '@') {
1084 char *plus = strchr(line, '+');
1085 if (plus)
1086 data->lineno = strtol(plus, NULL, 10);
1087 else
1088 die("invalid diff");
1089 }
1090 }
1091
1092 static unsigned char *deflate_it(char *data,
1093 unsigned long size,
1094 unsigned long *result_size)
1095 {
1096 int bound;
1097 unsigned char *deflated;
1098 z_stream stream;
1099
1100 memset(&stream, 0, sizeof(stream));
1101 deflateInit(&stream, zlib_compression_level);
1102 bound = deflateBound(&stream, size);
1103 deflated = xmalloc(bound);
1104 stream.next_out = deflated;
1105 stream.avail_out = bound;
1106
1107 stream.next_in = (unsigned char *)data;
1108 stream.avail_in = size;
1109 while (deflate(&stream, Z_FINISH) == Z_OK)
1110 ; /* nothing */
1111 deflateEnd(&stream);
1112 *result_size = stream.total_out;
1113 return deflated;
1114 }
1115
1116 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1117 {
1118 void *cp;
1119 void *delta;
1120 void *deflated;
1121 void *data;
1122 unsigned long orig_size;
1123 unsigned long delta_size;
1124 unsigned long deflate_size;
1125 unsigned long data_size;
1126
1127 /* We could do deflated delta, or we could do just deflated two,
1128 * whichever is smaller.
1129 */
1130 delta = NULL;
1131 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1132 if (one->size && two->size) {
1133 delta = diff_delta(one->ptr, one->size,
1134 two->ptr, two->size,
1135 &delta_size, deflate_size);
1136 if (delta) {
1137 void *to_free = delta;
1138 orig_size = delta_size;
1139 delta = deflate_it(delta, delta_size, &delta_size);
1140 free(to_free);
1141 }
1142 }
1143
1144 if (delta && delta_size < deflate_size) {
1145 printf("delta %lu\n", orig_size);
1146 free(deflated);
1147 data = delta;
1148 data_size = delta_size;
1149 }
1150 else {
1151 printf("literal %lu\n", two->size);
1152 free(delta);
1153 data = deflated;
1154 data_size = deflate_size;
1155 }
1156
1157 /* emit data encoded in base85 */
1158 cp = data;
1159 while (data_size) {
1160 int bytes = (52 < data_size) ? 52 : data_size;
1161 char line[70];
1162 data_size -= bytes;
1163 if (bytes <= 26)
1164 line[0] = bytes + 'A' - 1;
1165 else
1166 line[0] = bytes - 26 + 'a' - 1;
1167 encode_85(line + 1, cp, bytes);
1168 cp = (char *) cp + bytes;
1169 puts(line);
1170 }
1171 printf("\n");
1172 free(data);
1173 }
1174
1175 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1176 {
1177 printf("GIT binary patch\n");
1178 emit_binary_diff_body(one, two);
1179 emit_binary_diff_body(two, one);
1180 }
1181
1182 static void setup_diff_attr_check(struct git_attr_check *check)
1183 {
1184 static struct git_attr *attr_diff;
1185
1186 if (!attr_diff) {
1187 attr_diff = git_attr("diff", 4);
1188 }
1189 check[0].attr = attr_diff;
1190 }
1191
1192 static void diff_filespec_check_attr(struct diff_filespec *one)
1193 {
1194 struct git_attr_check attr_diff_check;
1195 int check_from_data = 0;
1196
1197 if (one->checked_attr)
1198 return;
1199
1200 setup_diff_attr_check(&attr_diff_check);
1201 one->is_binary = 0;
1202 one->funcname_pattern_ident = NULL;
1203
1204 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1205 const char *value;
1206
1207 /* binaryness */
1208 value = attr_diff_check.value;
1209 if (ATTR_TRUE(value))
1210 ;
1211 else if (ATTR_FALSE(value))
1212 one->is_binary = 1;
1213 else
1214 check_from_data = 1;
1215
1216 /* funcname pattern ident */
1217 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1218 ;
1219 else
1220 one->funcname_pattern_ident = value;
1221 }
1222
1223 if (check_from_data) {
1224 if (!one->data && DIFF_FILE_VALID(one))
1225 diff_populate_filespec(one, 0);
1226
1227 if (one->data)
1228 one->is_binary = buffer_is_binary(one->data, one->size);
1229 }
1230 }
1231
1232 int diff_filespec_is_binary(struct diff_filespec *one)
1233 {
1234 diff_filespec_check_attr(one);
1235 return one->is_binary;
1236 }
1237
1238 static const char *funcname_pattern(const char *ident)
1239 {
1240 struct funcname_pattern *pp;
1241
1242 read_config_if_needed();
1243 for (pp = funcname_pattern_list; pp; pp = pp->next)
1244 if (!strcmp(ident, pp->name))
1245 return pp->pattern;
1246 return NULL;
1247 }
1248
1249 static struct builtin_funcname_pattern {
1250 const char *name;
1251 const char *pattern;
1252 } builtin_funcname_pattern[] = {
1253 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1254 "new\\|return\\|switch\\|throw\\|while\\)\n"
1255 "^[ ]*\\(\\([ ]*"
1256 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1257 "[ ]*([^;]*$\\)" },
1258 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1259 };
1260
1261 static const char *diff_funcname_pattern(struct diff_filespec *one)
1262 {
1263 const char *ident, *pattern;
1264 int i;
1265
1266 diff_filespec_check_attr(one);
1267 ident = one->funcname_pattern_ident;
1268
1269 if (!ident)
1270 /*
1271 * If the config file has "funcname.default" defined, that
1272 * regexp is used; otherwise NULL is returned and xemit uses
1273 * the built-in default.
1274 */
1275 return funcname_pattern("default");
1276
1277 /* Look up custom "funcname.$ident" regexp from config. */
1278 pattern = funcname_pattern(ident);
1279 if (pattern)
1280 return pattern;
1281
1282 /*
1283 * And define built-in fallback patterns here. Note that
1284 * these can be overriden by the user's config settings.
1285 */
1286 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1287 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1288 return builtin_funcname_pattern[i].pattern;
1289
1290 return NULL;
1291 }
1292
1293 static void builtin_diff(const char *name_a,
1294 const char *name_b,
1295 struct diff_filespec *one,
1296 struct diff_filespec *two,
1297 const char *xfrm_msg,
1298 struct diff_options *o,
1299 int complete_rewrite)
1300 {
1301 mmfile_t mf1, mf2;
1302 const char *lbl[2];
1303 char *a_one, *b_two;
1304 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1305 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1306
1307 a_one = quote_two("a/", name_a + (*name_a == '/'));
1308 b_two = quote_two("b/", name_b + (*name_b == '/'));
1309 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1310 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1311 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1312 if (lbl[0][0] == '/') {
1313 /* /dev/null */
1314 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1315 if (xfrm_msg && xfrm_msg[0])
1316 printf("%s%s%s\n", set, xfrm_msg, reset);
1317 }
1318 else if (lbl[1][0] == '/') {
1319 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1320 if (xfrm_msg && xfrm_msg[0])
1321 printf("%s%s%s\n", set, xfrm_msg, reset);
1322 }
1323 else {
1324 if (one->mode != two->mode) {
1325 printf("%sold mode %06o%s\n", set, one->mode, reset);
1326 printf("%snew mode %06o%s\n", set, two->mode, reset);
1327 }
1328 if (xfrm_msg && xfrm_msg[0])
1329 printf("%s%s%s\n", set, xfrm_msg, reset);
1330 /*
1331 * we do not run diff between different kind
1332 * of objects.
1333 */
1334 if ((one->mode ^ two->mode) & S_IFMT)
1335 goto free_ab_and_return;
1336 if (complete_rewrite) {
1337 emit_rewrite_diff(name_a, name_b, one, two,
1338 DIFF_OPT_TST(o, COLOR_DIFF));
1339 o->found_changes = 1;
1340 goto free_ab_and_return;
1341 }
1342 }
1343
1344 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1345 die("unable to read files to diff");
1346
1347 if (!DIFF_OPT_TST(o, TEXT) &&
1348 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1349 /* Quite common confusing case */
1350 if (mf1.size == mf2.size &&
1351 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1352 goto free_ab_and_return;
1353 if (DIFF_OPT_TST(o, BINARY))
1354 emit_binary_diff(&mf1, &mf2);
1355 else
1356 printf("Binary files %s and %s differ\n",
1357 lbl[0], lbl[1]);
1358 o->found_changes = 1;
1359 }
1360 else {
1361 /* Crazy xdl interfaces.. */
1362 const char *diffopts = getenv("GIT_DIFF_OPTS");
1363 xpparam_t xpp;
1364 xdemitconf_t xecfg;
1365 xdemitcb_t ecb;
1366 struct emit_callback ecbdata;
1367 const char *funcname_pattern;
1368
1369 funcname_pattern = diff_funcname_pattern(one);
1370 if (!funcname_pattern)
1371 funcname_pattern = diff_funcname_pattern(two);
1372
1373 memset(&xecfg, 0, sizeof(xecfg));
1374 memset(&ecbdata, 0, sizeof(ecbdata));
1375 ecbdata.label_path = lbl;
1376 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1377 ecbdata.found_changesp = &o->found_changes;
1378 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1379 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1380 xecfg.ctxlen = o->context;
1381 xecfg.flags = XDL_EMIT_FUNCNAMES;
1382 if (funcname_pattern)
1383 xdiff_set_find_func(&xecfg, funcname_pattern);
1384 if (!diffopts)
1385 ;
1386 else if (!prefixcmp(diffopts, "--unified="))
1387 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1388 else if (!prefixcmp(diffopts, "-u"))
1389 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1390 ecb.outf = xdiff_outf;
1391 ecb.priv = &ecbdata;
1392 ecbdata.xm.consume = fn_out_consume;
1393 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1394 ecbdata.diff_words =
1395 xcalloc(1, sizeof(struct diff_words_data));
1396 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1397 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1398 free_diff_words_data(&ecbdata);
1399 }
1400
1401 free_ab_and_return:
1402 diff_free_filespec_data(one);
1403 diff_free_filespec_data(two);
1404 free(a_one);
1405 free(b_two);
1406 return;
1407 }
1408
1409 static void builtin_diffstat(const char *name_a, const char *name_b,
1410 struct diff_filespec *one,
1411 struct diff_filespec *two,
1412 struct diffstat_t *diffstat,
1413 struct diff_options *o,
1414 int complete_rewrite)
1415 {
1416 mmfile_t mf1, mf2;
1417 struct diffstat_file *data;
1418
1419 data = diffstat_add(diffstat, name_a, name_b);
1420
1421 if (!one || !two) {
1422 data->is_unmerged = 1;
1423 return;
1424 }
1425 if (complete_rewrite) {
1426 diff_populate_filespec(one, 0);
1427 diff_populate_filespec(two, 0);
1428 data->deleted = count_lines(one->data, one->size);
1429 data->added = count_lines(two->data, two->size);
1430 goto free_and_return;
1431 }
1432 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1433 die("unable to read files to diff");
1434
1435 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1436 data->is_binary = 1;
1437 data->added = mf2.size;
1438 data->deleted = mf1.size;
1439 } else {
1440 /* Crazy xdl interfaces.. */
1441 xpparam_t xpp;
1442 xdemitconf_t xecfg;
1443 xdemitcb_t ecb;
1444
1445 memset(&xecfg, 0, sizeof(xecfg));
1446 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1447 ecb.outf = xdiff_outf;
1448 ecb.priv = diffstat;
1449 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1450 }
1451
1452 free_and_return:
1453 diff_free_filespec_data(one);
1454 diff_free_filespec_data(two);
1455 }
1456
1457 static void builtin_checkdiff(const char *name_a, const char *name_b,
1458 struct diff_filespec *one,
1459 struct diff_filespec *two, struct diff_options *o)
1460 {
1461 mmfile_t mf1, mf2;
1462 struct checkdiff_t data;
1463
1464 if (!two)
1465 return;
1466
1467 memset(&data, 0, sizeof(data));
1468 data.xm.consume = checkdiff_consume;
1469 data.filename = name_b ? name_b : name_a;
1470 data.lineno = 0;
1471 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1472 data.ws_rule = whitespace_rule(data.filename);
1473
1474 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1475 die("unable to read files to diff");
1476
1477 if (diff_filespec_is_binary(two))
1478 goto free_and_return;
1479 else {
1480 /* Crazy xdl interfaces.. */
1481 xpparam_t xpp;
1482 xdemitconf_t xecfg;
1483 xdemitcb_t ecb;
1484
1485 memset(&xecfg, 0, sizeof(xecfg));
1486 xpp.flags = XDF_NEED_MINIMAL;
1487 ecb.outf = xdiff_outf;
1488 ecb.priv = &data;
1489 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1490 }
1491 free_and_return:
1492 diff_free_filespec_data(one);
1493 diff_free_filespec_data(two);
1494 }
1495
1496 struct diff_filespec *alloc_filespec(const char *path)
1497 {
1498 int namelen = strlen(path);
1499 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1500
1501 memset(spec, 0, sizeof(*spec));
1502 spec->path = (char *)(spec + 1);
1503 memcpy(spec->path, path, namelen+1);
1504 spec->count = 1;
1505 return spec;
1506 }
1507
1508 void free_filespec(struct diff_filespec *spec)
1509 {
1510 if (!--spec->count) {
1511 diff_free_filespec_data(spec);
1512 free(spec);
1513 }
1514 }
1515
1516 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1517 unsigned short mode)
1518 {
1519 if (mode) {
1520 spec->mode = canon_mode(mode);
1521 hashcpy(spec->sha1, sha1);
1522 spec->sha1_valid = !is_null_sha1(sha1);
1523 }
1524 }
1525
1526 /*
1527 * Given a name and sha1 pair, if the index tells us the file in
1528 * the work tree has that object contents, return true, so that
1529 * prepare_temp_file() does not have to inflate and extract.
1530 */
1531 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1532 {
1533 struct cache_entry *ce;
1534 struct stat st;
1535 int pos, len;
1536
1537 /* We do not read the cache ourselves here, because the
1538 * benchmark with my previous version that always reads cache
1539 * shows that it makes things worse for diff-tree comparing
1540 * two linux-2.6 kernel trees in an already checked out work
1541 * tree. This is because most diff-tree comparisons deal with
1542 * only a small number of files, while reading the cache is
1543 * expensive for a large project, and its cost outweighs the
1544 * savings we get by not inflating the object to a temporary
1545 * file. Practically, this code only helps when we are used
1546 * by diff-cache --cached, which does read the cache before
1547 * calling us.
1548 */
1549 if (!active_cache)
1550 return 0;
1551
1552 /* We want to avoid the working directory if our caller
1553 * doesn't need the data in a normal file, this system
1554 * is rather slow with its stat/open/mmap/close syscalls,
1555 * and the object is contained in a pack file. The pack
1556 * is probably already open and will be faster to obtain
1557 * the data through than the working directory. Loose
1558 * objects however would tend to be slower as they need
1559 * to be individually opened and inflated.
1560 */
1561 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1562 return 0;
1563
1564 len = strlen(name);
1565 pos = cache_name_pos(name, len);
1566 if (pos < 0)
1567 return 0;
1568 ce = active_cache[pos];
1569 if ((lstat(name, &st) < 0) ||
1570 !S_ISREG(st.st_mode) || /* careful! */
1571 ce_match_stat(ce, &st, 0) ||
1572 hashcmp(sha1, ce->sha1))
1573 return 0;
1574 /* we return 1 only when we can stat, it is a regular file,
1575 * stat information matches, and sha1 recorded in the cache
1576 * matches. I.e. we know the file in the work tree really is
1577 * the same as the <name, sha1> pair.
1578 */
1579 return 1;
1580 }
1581
1582 static int populate_from_stdin(struct diff_filespec *s)
1583 {
1584 struct strbuf buf;
1585 size_t size = 0;
1586
1587 strbuf_init(&buf, 0);
1588 if (strbuf_read(&buf, 0, 0) < 0)
1589 return error("error while reading from stdin %s",
1590 strerror(errno));
1591
1592 s->should_munmap = 0;
1593 s->data = strbuf_detach(&buf, &size);
1594 s->size = size;
1595 s->should_free = 1;
1596 return 0;
1597 }
1598
1599 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1600 {
1601 int len;
1602 char *data = xmalloc(100);
1603 len = snprintf(data, 100,
1604 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1605 s->data = data;
1606 s->size = len;
1607 s->should_free = 1;
1608 if (size_only) {
1609 s->data = NULL;
1610 free(data);
1611 }
1612 return 0;
1613 }
1614
1615 /*
1616 * While doing rename detection and pickaxe operation, we may need to
1617 * grab the data for the blob (or file) for our own in-core comparison.
1618 * diff_filespec has data and size fields for this purpose.
1619 */
1620 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1621 {
1622 int err = 0;
1623 if (!DIFF_FILE_VALID(s))
1624 die("internal error: asking to populate invalid file.");
1625 if (S_ISDIR(s->mode))
1626 return -1;
1627
1628 if (s->data)
1629 return 0;
1630
1631 if (size_only && 0 < s->size)
1632 return 0;
1633
1634 if (S_ISGITLINK(s->mode))
1635 return diff_populate_gitlink(s, size_only);
1636
1637 if (!s->sha1_valid ||
1638 reuse_worktree_file(s->path, s->sha1, 0)) {
1639 struct strbuf buf;
1640 struct stat st;
1641 int fd;
1642
1643 if (!strcmp(s->path, "-"))
1644 return populate_from_stdin(s);
1645
1646 if (lstat(s->path, &st) < 0) {
1647 if (errno == ENOENT) {
1648 err_empty:
1649 err = -1;
1650 empty:
1651 s->data = (char *)"";
1652 s->size = 0;
1653 return err;
1654 }
1655 }
1656 s->size = xsize_t(st.st_size);
1657 if (!s->size)
1658 goto empty;
1659 if (size_only)
1660 return 0;
1661 if (S_ISLNK(st.st_mode)) {
1662 int ret;
1663 s->data = xmalloc(s->size);
1664 s->should_free = 1;
1665 ret = readlink(s->path, s->data, s->size);
1666 if (ret < 0) {
1667 free(s->data);
1668 goto err_empty;
1669 }
1670 return 0;
1671 }
1672 fd = open(s->path, O_RDONLY);
1673 if (fd < 0)
1674 goto err_empty;
1675 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1676 close(fd);
1677 s->should_munmap = 1;
1678
1679 /*
1680 * Convert from working tree format to canonical git format
1681 */
1682 strbuf_init(&buf, 0);
1683 if (convert_to_git(s->path, s->data, s->size, &buf)) {
1684 size_t size = 0;
1685 munmap(s->data, s->size);
1686 s->should_munmap = 0;
1687 s->data = strbuf_detach(&buf, &size);
1688 s->size = size;
1689 s->should_free = 1;
1690 }
1691 }
1692 else {
1693 enum object_type type;
1694 if (size_only)
1695 type = sha1_object_info(s->sha1, &s->size);
1696 else {
1697 s->data = read_sha1_file(s->sha1, &type, &s->size);
1698 s->should_free = 1;
1699 }
1700 }
1701 return 0;
1702 }
1703
1704 void diff_free_filespec_blob(struct diff_filespec *s)
1705 {
1706 if (s->should_free)
1707 free(s->data);
1708 else if (s->should_munmap)
1709 munmap(s->data, s->size);
1710
1711 if (s->should_free || s->should_munmap) {
1712 s->should_free = s->should_munmap = 0;
1713 s->data = NULL;
1714 }
1715 }
1716
1717 void diff_free_filespec_data(struct diff_filespec *s)
1718 {
1719 diff_free_filespec_blob(s);
1720 free(s->cnt_data);
1721 s->cnt_data = NULL;
1722 }
1723
1724 static void prep_temp_blob(struct diff_tempfile *temp,
1725 void *blob,
1726 unsigned long size,
1727 const unsigned char *sha1,
1728 int mode)
1729 {
1730 int fd;
1731
1732 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1733 if (fd < 0)
1734 die("unable to create temp-file: %s", strerror(errno));
1735 if (write_in_full(fd, blob, size) != size)
1736 die("unable to write temp-file");
1737 close(fd);
1738 temp->name = temp->tmp_path;
1739 strcpy(temp->hex, sha1_to_hex(sha1));
1740 temp->hex[40] = 0;
1741 sprintf(temp->mode, "%06o", mode);
1742 }
1743
1744 static void prepare_temp_file(const char *name,
1745 struct diff_tempfile *temp,
1746 struct diff_filespec *one)
1747 {
1748 if (!DIFF_FILE_VALID(one)) {
1749 not_a_valid_file:
1750 /* A '-' entry produces this for file-2, and
1751 * a '+' entry produces this for file-1.
1752 */
1753 temp->name = "/dev/null";
1754 strcpy(temp->hex, ".");
1755 strcpy(temp->mode, ".");
1756 return;
1757 }
1758
1759 if (!one->sha1_valid ||
1760 reuse_worktree_file(name, one->sha1, 1)) {
1761 struct stat st;
1762 if (lstat(name, &st) < 0) {
1763 if (errno == ENOENT)
1764 goto not_a_valid_file;
1765 die("stat(%s): %s", name, strerror(errno));
1766 }
1767 if (S_ISLNK(st.st_mode)) {
1768 int ret;
1769 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1770 size_t sz = xsize_t(st.st_size);
1771 if (sizeof(buf) <= st.st_size)
1772 die("symlink too long: %s", name);
1773 ret = readlink(name, buf, sz);
1774 if (ret < 0)
1775 die("readlink(%s)", name);
1776 prep_temp_blob(temp, buf, sz,
1777 (one->sha1_valid ?
1778 one->sha1 : null_sha1),
1779 (one->sha1_valid ?
1780 one->mode : S_IFLNK));
1781 }
1782 else {
1783 /* we can borrow from the file in the work tree */
1784 temp->name = name;
1785 if (!one->sha1_valid)
1786 strcpy(temp->hex, sha1_to_hex(null_sha1));
1787 else
1788 strcpy(temp->hex, sha1_to_hex(one->sha1));
1789 /* Even though we may sometimes borrow the
1790 * contents from the work tree, we always want
1791 * one->mode. mode is trustworthy even when
1792 * !(one->sha1_valid), as long as
1793 * DIFF_FILE_VALID(one).
1794 */
1795 sprintf(temp->mode, "%06o", one->mode);
1796 }
1797 return;
1798 }
1799 else {
1800 if (diff_populate_filespec(one, 0))
1801 die("cannot read data blob for %s", one->path);
1802 prep_temp_blob(temp, one->data, one->size,
1803 one->sha1, one->mode);
1804 }
1805 }
1806
1807 static void remove_tempfile(void)
1808 {
1809 int i;
1810
1811 for (i = 0; i < 2; i++)
1812 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1813 unlink(diff_temp[i].name);
1814 diff_temp[i].name = NULL;
1815 }
1816 }
1817
1818 static void remove_tempfile_on_signal(int signo)
1819 {
1820 remove_tempfile();
1821 signal(SIGINT, SIG_DFL);
1822 raise(signo);
1823 }
1824
1825 /* An external diff command takes:
1826 *
1827 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1828 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1829 *
1830 */
1831 static void run_external_diff(const char *pgm,
1832 const char *name,
1833 const char *other,
1834 struct diff_filespec *one,
1835 struct diff_filespec *two,
1836 const char *xfrm_msg,
1837 int complete_rewrite)
1838 {
1839 const char *spawn_arg[10];
1840 struct diff_tempfile *temp = diff_temp;
1841 int retval;
1842 static int atexit_asked = 0;
1843 const char *othername;
1844 const char **arg = &spawn_arg[0];
1845
1846 othername = (other? other : name);
1847 if (one && two) {
1848 prepare_temp_file(name, &temp[0], one);
1849 prepare_temp_file(othername, &temp[1], two);
1850 if (! atexit_asked &&
1851 (temp[0].name == temp[0].tmp_path ||
1852 temp[1].name == temp[1].tmp_path)) {
1853 atexit_asked = 1;
1854 atexit(remove_tempfile);
1855 }
1856 signal(SIGINT, remove_tempfile_on_signal);
1857 }
1858
1859 if (one && two) {
1860 *arg++ = pgm;
1861 *arg++ = name;
1862 *arg++ = temp[0].name;
1863 *arg++ = temp[0].hex;
1864 *arg++ = temp[0].mode;
1865 *arg++ = temp[1].name;
1866 *arg++ = temp[1].hex;
1867 *arg++ = temp[1].mode;
1868 if (other) {
1869 *arg++ = other;
1870 *arg++ = xfrm_msg;
1871 }
1872 } else {
1873 *arg++ = pgm;
1874 *arg++ = name;
1875 }
1876 *arg = NULL;
1877 fflush(NULL);
1878 retval = run_command_v_opt(spawn_arg, 0);
1879 remove_tempfile();
1880 if (retval) {
1881 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1882 exit(1);
1883 }
1884 }
1885
1886 static const char *external_diff_attr(const char *name)
1887 {
1888 struct git_attr_check attr_diff_check;
1889
1890 setup_diff_attr_check(&attr_diff_check);
1891 if (!git_checkattr(name, 1, &attr_diff_check)) {
1892 const char *value = attr_diff_check.value;
1893 if (!ATTR_TRUE(value) &&
1894 !ATTR_FALSE(value) &&
1895 !ATTR_UNSET(value)) {
1896 struct ll_diff_driver *drv;
1897
1898 read_config_if_needed();
1899 for (drv = user_diff; drv; drv = drv->next)
1900 if (!strcmp(drv->name, value))
1901 return drv->cmd;
1902 }
1903 }
1904 return NULL;
1905 }
1906
1907 static void run_diff_cmd(const char *pgm,
1908 const char *name,
1909 const char *other,
1910 struct diff_filespec *one,
1911 struct diff_filespec *two,
1912 const char *xfrm_msg,
1913 struct diff_options *o,
1914 int complete_rewrite)
1915 {
1916 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
1917 pgm = NULL;
1918 else {
1919 const char *cmd = external_diff_attr(name);
1920 if (cmd)
1921 pgm = cmd;
1922 }
1923
1924 if (pgm) {
1925 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1926 complete_rewrite);
1927 return;
1928 }
1929 if (one && two)
1930 builtin_diff(name, other ? other : name,
1931 one, two, xfrm_msg, o, complete_rewrite);
1932 else
1933 printf("* Unmerged path %s\n", name);
1934 }
1935
1936 static void diff_fill_sha1_info(struct diff_filespec *one)
1937 {
1938 if (DIFF_FILE_VALID(one)) {
1939 if (!one->sha1_valid) {
1940 struct stat st;
1941 if (!strcmp(one->path, "-")) {
1942 hashcpy(one->sha1, null_sha1);
1943 return;
1944 }
1945 if (lstat(one->path, &st) < 0)
1946 die("stat %s", one->path);
1947 if (index_path(one->sha1, one->path, &st, 0))
1948 die("cannot hash %s\n", one->path);
1949 }
1950 }
1951 else
1952 hashclr(one->sha1);
1953 }
1954
1955 static int similarity_index(struct diff_filepair *p)
1956 {
1957 return p->score * 100 / MAX_SCORE;
1958 }
1959
1960 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1961 {
1962 const char *pgm = external_diff();
1963 struct strbuf msg;
1964 char *xfrm_msg;
1965 struct diff_filespec *one = p->one;
1966 struct diff_filespec *two = p->two;
1967 const char *name;
1968 const char *other;
1969 int complete_rewrite = 0;
1970
1971
1972 if (DIFF_PAIR_UNMERGED(p)) {
1973 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1974 return;
1975 }
1976
1977 name = p->one->path;
1978 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1979 diff_fill_sha1_info(one);
1980 diff_fill_sha1_info(two);
1981
1982 strbuf_init(&msg, PATH_MAX * 2 + 300);
1983 switch (p->status) {
1984 case DIFF_STATUS_COPIED:
1985 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1986 strbuf_addstr(&msg, "\ncopy from ");
1987 quote_c_style(name, &msg, NULL, 0);
1988 strbuf_addstr(&msg, "\ncopy to ");
1989 quote_c_style(other, &msg, NULL, 0);
1990 strbuf_addch(&msg, '\n');
1991 break;
1992 case DIFF_STATUS_RENAMED:
1993 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1994 strbuf_addstr(&msg, "\nrename from ");
1995 quote_c_style(name, &msg, NULL, 0);
1996 strbuf_addstr(&msg, "\nrename to ");
1997 quote_c_style(other, &msg, NULL, 0);
1998 strbuf_addch(&msg, '\n');
1999 break;
2000 case DIFF_STATUS_MODIFIED:
2001 if (p->score) {
2002 strbuf_addf(&msg, "dissimilarity index %d%%\n",
2003 similarity_index(p));
2004 complete_rewrite = 1;
2005 break;
2006 }
2007 /* fallthru */
2008 default:
2009 /* nothing */
2010 ;
2011 }
2012
2013 if (hashcmp(one->sha1, two->sha1)) {
2014 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2015
2016 if (DIFF_OPT_TST(o, BINARY)) {
2017 mmfile_t mf;
2018 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2019 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2020 abbrev = 40;
2021 }
2022 strbuf_addf(&msg, "index %.*s..%.*s",
2023 abbrev, sha1_to_hex(one->sha1),
2024 abbrev, sha1_to_hex(two->sha1));
2025 if (one->mode == two->mode)
2026 strbuf_addf(&msg, " %06o", one->mode);
2027 strbuf_addch(&msg, '\n');
2028 }
2029
2030 if (msg.len)
2031 strbuf_setlen(&msg, msg.len - 1);
2032 xfrm_msg = msg.len ? msg.buf : NULL;
2033
2034 if (!pgm &&
2035 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2036 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2037 /* a filepair that changes between file and symlink
2038 * needs to be split into deletion and creation.
2039 */
2040 struct diff_filespec *null = alloc_filespec(two->path);
2041 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
2042 free(null);
2043 null = alloc_filespec(one->path);
2044 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
2045 free(null);
2046 }
2047 else
2048 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
2049 complete_rewrite);
2050
2051 strbuf_release(&msg);
2052 }
2053
2054 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2055 struct diffstat_t *diffstat)
2056 {
2057 const char *name;
2058 const char *other;
2059 int complete_rewrite = 0;
2060
2061 if (DIFF_PAIR_UNMERGED(p)) {
2062 /* unmerged */
2063 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2064 return;
2065 }
2066
2067 name = p->one->path;
2068 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2069
2070 diff_fill_sha1_info(p->one);
2071 diff_fill_sha1_info(p->two);
2072
2073 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2074 complete_rewrite = 1;
2075 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2076 }
2077
2078 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2079 {
2080 const char *name;
2081 const char *other;
2082
2083 if (DIFF_PAIR_UNMERGED(p)) {
2084 /* unmerged */
2085 return;
2086 }
2087
2088 name = p->one->path;
2089 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2090
2091 diff_fill_sha1_info(p->one);
2092 diff_fill_sha1_info(p->two);
2093
2094 builtin_checkdiff(name, other, p->one, p->two, o);
2095 }
2096
2097 void diff_setup(struct diff_options *options)
2098 {
2099 memset(options, 0, sizeof(*options));
2100 options->line_termination = '\n';
2101 options->break_opt = -1;
2102 options->rename_limit = -1;
2103 options->context = 3;
2104 options->msg_sep = "";
2105
2106 options->change = diff_change;
2107 options->add_remove = diff_addremove;
2108 if (diff_use_color_default)
2109 DIFF_OPT_SET(options, COLOR_DIFF);
2110 else
2111 DIFF_OPT_CLR(options, COLOR_DIFF);
2112 options->detect_rename = diff_detect_rename_default;
2113 }
2114
2115 int diff_setup_done(struct diff_options *options)
2116 {
2117 int count = 0;
2118
2119 if (options->output_format & DIFF_FORMAT_NAME)
2120 count++;
2121 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2122 count++;
2123 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2124 count++;
2125 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2126 count++;
2127 if (count > 1)
2128 die("--name-only, --name-status, --check and -s are mutually exclusive");
2129
2130 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2131 options->detect_rename = DIFF_DETECT_COPY;
2132
2133 if (options->output_format & (DIFF_FORMAT_NAME |
2134 DIFF_FORMAT_NAME_STATUS |
2135 DIFF_FORMAT_CHECKDIFF |
2136 DIFF_FORMAT_NO_OUTPUT))
2137 options->output_format &= ~(DIFF_FORMAT_RAW |
2138 DIFF_FORMAT_NUMSTAT |
2139 DIFF_FORMAT_DIFFSTAT |
2140 DIFF_FORMAT_SHORTSTAT |
2141 DIFF_FORMAT_SUMMARY |
2142 DIFF_FORMAT_PATCH);
2143
2144 /*
2145 * These cases always need recursive; we do not drop caller-supplied
2146 * recursive bits for other formats here.
2147 */
2148 if (options->output_format & (DIFF_FORMAT_PATCH |
2149 DIFF_FORMAT_NUMSTAT |
2150 DIFF_FORMAT_DIFFSTAT |
2151 DIFF_FORMAT_SHORTSTAT |
2152 DIFF_FORMAT_SUMMARY |
2153 DIFF_FORMAT_CHECKDIFF))
2154 DIFF_OPT_SET(options, RECURSIVE);
2155 /*
2156 * Also pickaxe would not work very well if you do not say recursive
2157 */
2158 if (options->pickaxe)
2159 DIFF_OPT_SET(options, RECURSIVE);
2160
2161 if (options->detect_rename && options->rename_limit < 0)
2162 options->rename_limit = diff_rename_limit_default;
2163 if (options->setup & DIFF_SETUP_USE_CACHE) {
2164 if (!active_cache)
2165 /* read-cache does not die even when it fails
2166 * so it is safe for us to do this here. Also
2167 * it does not smudge active_cache or active_nr
2168 * when it fails, so we do not have to worry about
2169 * cleaning it up ourselves either.
2170 */
2171 read_cache();
2172 }
2173 if (options->abbrev <= 0 || 40 < options->abbrev)
2174 options->abbrev = 40; /* full */
2175
2176 /*
2177 * It does not make sense to show the first hit we happened
2178 * to have found. It does not make sense not to return with
2179 * exit code in such a case either.
2180 */
2181 if (DIFF_OPT_TST(options, QUIET)) {
2182 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2183 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2184 }
2185
2186 /*
2187 * If we postprocess in diffcore, we cannot simply return
2188 * upon the first hit. We need to run diff as usual.
2189 */
2190 if (options->pickaxe || options->filter)
2191 DIFF_OPT_CLR(options, QUIET);
2192
2193 return 0;
2194 }
2195
2196 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2197 {
2198 char c, *eq;
2199 int len;
2200
2201 if (*arg != '-')
2202 return 0;
2203 c = *++arg;
2204 if (!c)
2205 return 0;
2206 if (c == arg_short) {
2207 c = *++arg;
2208 if (!c)
2209 return 1;
2210 if (val && isdigit(c)) {
2211 char *end;
2212 int n = strtoul(arg, &end, 10);
2213 if (*end)
2214 return 0;
2215 *val = n;
2216 return 1;
2217 }
2218 return 0;
2219 }
2220 if (c != '-')
2221 return 0;
2222 arg++;
2223 eq = strchr(arg, '=');
2224 if (eq)
2225 len = eq - arg;
2226 else
2227 len = strlen(arg);
2228 if (!len || strncmp(arg, arg_long, len))
2229 return 0;
2230 if (eq) {
2231 int n;
2232 char *end;
2233 if (!isdigit(*++eq))
2234 return 0;
2235 n = strtoul(eq, &end, 10);
2236 if (*end)
2237 return 0;
2238 *val = n;
2239 }
2240 return 1;
2241 }
2242
2243 static int diff_scoreopt_parse(const char *opt);
2244
2245 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2246 {
2247 const char *arg = av[0];
2248
2249 /* Output format options */
2250 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2251 options->output_format |= DIFF_FORMAT_PATCH;
2252 else if (opt_arg(arg, 'U', "unified", &options->context))
2253 options->output_format |= DIFF_FORMAT_PATCH;
2254 else if (!strcmp(arg, "--raw"))
2255 options->output_format |= DIFF_FORMAT_RAW;
2256 else if (!strcmp(arg, "--patch-with-raw"))
2257 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2258 else if (!strcmp(arg, "--numstat"))
2259 options->output_format |= DIFF_FORMAT_NUMSTAT;
2260 else if (!strcmp(arg, "--shortstat"))
2261 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2262 else if (!strcmp(arg, "--check"))
2263 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2264 else if (!strcmp(arg, "--summary"))
2265 options->output_format |= DIFF_FORMAT_SUMMARY;
2266 else if (!strcmp(arg, "--patch-with-stat"))
2267 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2268 else if (!strcmp(arg, "--name-only"))
2269 options->output_format |= DIFF_FORMAT_NAME;
2270 else if (!strcmp(arg, "--name-status"))
2271 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2272 else if (!strcmp(arg, "-s"))
2273 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
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
2302 /* renames options */
2303 else if (!prefixcmp(arg, "-B")) {
2304 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2305 return -1;
2306 }
2307 else if (!prefixcmp(arg, "-M")) {
2308 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2309 return -1;
2310 options->detect_rename = DIFF_DETECT_RENAME;
2311 }
2312 else if (!prefixcmp(arg, "-C")) {
2313 if (options->detect_rename == DIFF_DETECT_COPY)
2314 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2315 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2316 return -1;
2317 options->detect_rename = DIFF_DETECT_COPY;
2318 }
2319 else if (!strcmp(arg, "--no-renames"))
2320 options->detect_rename = 0;
2321
2322 /* xdiff options */
2323 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2324 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2325 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2326 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2327 else if (!strcmp(arg, "--ignore-space-at-eol"))
2328 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2329
2330 /* flags options */
2331 else if (!strcmp(arg, "--binary")) {
2332 options->output_format |= DIFF_FORMAT_PATCH;
2333 DIFF_OPT_SET(options, BINARY);
2334 }
2335 else if (!strcmp(arg, "--full-index"))
2336 DIFF_OPT_SET(options, FULL_INDEX);
2337 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2338 DIFF_OPT_SET(options, TEXT);
2339 else if (!strcmp(arg, "-R"))
2340 DIFF_OPT_SET(options, REVERSE_DIFF);
2341 else if (!strcmp(arg, "--find-copies-harder"))
2342 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2343 else if (!strcmp(arg, "--follow"))
2344 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2345 else if (!strcmp(arg, "--color"))
2346 DIFF_OPT_SET(options, COLOR_DIFF);
2347 else if (!strcmp(arg, "--no-color"))
2348 DIFF_OPT_CLR(options, COLOR_DIFF);
2349 else if (!strcmp(arg, "--color-words"))
2350 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2351 else if (!strcmp(arg, "--exit-code"))
2352 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2353 else if (!strcmp(arg, "--quiet"))
2354 DIFF_OPT_SET(options, QUIET);
2355 else if (!strcmp(arg, "--ext-diff"))
2356 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2357 else if (!strcmp(arg, "--no-ext-diff"))
2358 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2359
2360 /* misc options */
2361 else if (!strcmp(arg, "-z"))
2362 options->line_termination = 0;
2363 else if (!prefixcmp(arg, "-l"))
2364 options->rename_limit = strtoul(arg+2, NULL, 10);
2365 else if (!prefixcmp(arg, "-S"))
2366 options->pickaxe = arg + 2;
2367 else if (!strcmp(arg, "--pickaxe-all"))
2368 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2369 else if (!strcmp(arg, "--pickaxe-regex"))
2370 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2371 else if (!prefixcmp(arg, "-O"))
2372 options->orderfile = arg + 2;
2373 else if (!prefixcmp(arg, "--diff-filter="))
2374 options->filter = arg + 14;
2375 else if (!strcmp(arg, "--abbrev"))
2376 options->abbrev = DEFAULT_ABBREV;
2377 else if (!prefixcmp(arg, "--abbrev=")) {
2378 options->abbrev = strtoul(arg + 9, NULL, 10);
2379 if (options->abbrev < MINIMUM_ABBREV)
2380 options->abbrev = MINIMUM_ABBREV;
2381 else if (40 < options->abbrev)
2382 options->abbrev = 40;
2383 }
2384 else
2385 return 0;
2386 return 1;
2387 }
2388
2389 static int parse_num(const char **cp_p)
2390 {
2391 unsigned long num, scale;
2392 int ch, dot;
2393 const char *cp = *cp_p;
2394
2395 num = 0;
2396 scale = 1;
2397 dot = 0;
2398 for(;;) {
2399 ch = *cp;
2400 if ( !dot && ch == '.' ) {
2401 scale = 1;
2402 dot = 1;
2403 } else if ( ch == '%' ) {
2404 scale = dot ? scale*100 : 100;
2405 cp++; /* % is always at the end */
2406 break;
2407 } else if ( ch >= '0' && ch <= '9' ) {
2408 if ( scale < 100000 ) {
2409 scale *= 10;
2410 num = (num*10) + (ch-'0');
2411 }
2412 } else {
2413 break;
2414 }
2415 cp++;
2416 }
2417 *cp_p = cp;
2418
2419 /* user says num divided by scale and we say internally that
2420 * is MAX_SCORE * num / scale.
2421 */
2422 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2423 }
2424
2425 static int diff_scoreopt_parse(const char *opt)
2426 {
2427 int opt1, opt2, cmd;
2428
2429 if (*opt++ != '-')
2430 return -1;
2431 cmd = *opt++;
2432 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2433 return -1; /* that is not a -M, -C nor -B option */
2434
2435 opt1 = parse_num(&opt);
2436 if (cmd != 'B')
2437 opt2 = 0;
2438 else {
2439 if (*opt == 0)
2440 opt2 = 0;
2441 else if (*opt != '/')
2442 return -1; /* we expect -B80/99 or -B80 */
2443 else {
2444 opt++;
2445 opt2 = parse_num(&opt);
2446 }
2447 }
2448 if (*opt != 0)
2449 return -1;
2450 return opt1 | (opt2 << 16);
2451 }
2452
2453 struct diff_queue_struct diff_queued_diff;
2454
2455 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2456 {
2457 if (queue->alloc <= queue->nr) {
2458 queue->alloc = alloc_nr(queue->alloc);
2459 queue->queue = xrealloc(queue->queue,
2460 sizeof(dp) * queue->alloc);
2461 }
2462 queue->queue[queue->nr++] = dp;
2463 }
2464
2465 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2466 struct diff_filespec *one,
2467 struct diff_filespec *two)
2468 {
2469 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2470 dp->one = one;
2471 dp->two = two;
2472 if (queue)
2473 diff_q(queue, dp);
2474 return dp;
2475 }
2476
2477 void diff_free_filepair(struct diff_filepair *p)
2478 {
2479 free_filespec(p->one);
2480 free_filespec(p->two);
2481 free(p);
2482 }
2483
2484 /* This is different from find_unique_abbrev() in that
2485 * it stuffs the result with dots for alignment.
2486 */
2487 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2488 {
2489 int abblen;
2490 const char *abbrev;
2491 if (len == 40)
2492 return sha1_to_hex(sha1);
2493
2494 abbrev = find_unique_abbrev(sha1, len);
2495 if (!abbrev)
2496 return sha1_to_hex(sha1);
2497 abblen = strlen(abbrev);
2498 if (abblen < 37) {
2499 static char hex[41];
2500 if (len < abblen && abblen <= len + 2)
2501 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2502 else
2503 sprintf(hex, "%s...", abbrev);
2504 return hex;
2505 }
2506 return sha1_to_hex(sha1);
2507 }
2508
2509 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2510 {
2511 int line_termination = opt->line_termination;
2512 int inter_name_termination = line_termination ? '\t' : '\0';
2513
2514 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2515 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2516 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2517 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2518 }
2519 if (p->score) {
2520 printf("%c%03d%c", p->status, similarity_index(p),
2521 inter_name_termination);
2522 } else {
2523 printf("%c%c", p->status, inter_name_termination);
2524 }
2525
2526 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2527 write_name_quoted(p->one->path, stdout, inter_name_termination);
2528 write_name_quoted(p->two->path, stdout, line_termination);
2529 } else {
2530 const char *path = p->one->mode ? p->one->path : p->two->path;
2531 write_name_quoted(path, stdout, line_termination);
2532 }
2533 }
2534
2535 int diff_unmodified_pair(struct diff_filepair *p)
2536 {
2537 /* This function is written stricter than necessary to support
2538 * the currently implemented transformers, but the idea is to
2539 * let transformers to produce diff_filepairs any way they want,
2540 * and filter and clean them up here before producing the output.
2541 */
2542 struct diff_filespec *one = p->one, *two = p->two;
2543
2544 if (DIFF_PAIR_UNMERGED(p))
2545 return 0; /* unmerged is interesting */
2546
2547 /* deletion, addition, mode or type change
2548 * and rename are all interesting.
2549 */
2550 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2551 DIFF_PAIR_MODE_CHANGED(p) ||
2552 strcmp(one->path, two->path))
2553 return 0;
2554
2555 /* both are valid and point at the same path. that is, we are
2556 * dealing with a change.
2557 */
2558 if (one->sha1_valid && two->sha1_valid &&
2559 !hashcmp(one->sha1, two->sha1))
2560 return 1; /* no change */
2561 if (!one->sha1_valid && !two->sha1_valid)
2562 return 1; /* both look at the same file on the filesystem. */
2563 return 0;
2564 }
2565
2566 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2567 {
2568 if (diff_unmodified_pair(p))
2569 return;
2570
2571 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2572 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2573 return; /* no tree diffs in patch format */
2574
2575 run_diff(p, o);
2576 }
2577
2578 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2579 struct diffstat_t *diffstat)
2580 {
2581 if (diff_unmodified_pair(p))
2582 return;
2583
2584 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2585 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2586 return; /* no tree diffs in patch format */
2587
2588 run_diffstat(p, o, diffstat);
2589 }
2590
2591 static void diff_flush_checkdiff(struct diff_filepair *p,
2592 struct diff_options *o)
2593 {
2594 if (diff_unmodified_pair(p))
2595 return;
2596
2597 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2598 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2599 return; /* no tree diffs in patch format */
2600
2601 run_checkdiff(p, o);
2602 }
2603
2604 int diff_queue_is_empty(void)
2605 {
2606 struct diff_queue_struct *q = &diff_queued_diff;
2607 int i;
2608 for (i = 0; i < q->nr; i++)
2609 if (!diff_unmodified_pair(q->queue[i]))
2610 return 0;
2611 return 1;
2612 }
2613
2614 #if DIFF_DEBUG
2615 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2616 {
2617 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2618 x, one ? one : "",
2619 s->path,
2620 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2621 s->mode,
2622 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2623 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2624 x, one ? one : "",
2625 s->size, s->xfrm_flags);
2626 }
2627
2628 void diff_debug_filepair(const struct diff_filepair *p, int i)
2629 {
2630 diff_debug_filespec(p->one, i, "one");
2631 diff_debug_filespec(p->two, i, "two");
2632 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2633 p->score, p->status ? p->status : '?',
2634 p->one->rename_used, p->broken_pair);
2635 }
2636
2637 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2638 {
2639 int i;
2640 if (msg)
2641 fprintf(stderr, "%s\n", msg);
2642 fprintf(stderr, "q->nr = %d\n", q->nr);
2643 for (i = 0; i < q->nr; i++) {
2644 struct diff_filepair *p = q->queue[i];
2645 diff_debug_filepair(p, i);
2646 }
2647 }
2648 #endif
2649
2650 static void diff_resolve_rename_copy(void)
2651 {
2652 int i;
2653 struct diff_filepair *p;
2654 struct diff_queue_struct *q = &diff_queued_diff;
2655
2656 diff_debug_queue("resolve-rename-copy", q);
2657
2658 for (i = 0; i < q->nr; i++) {
2659 p = q->queue[i];
2660 p->status = 0; /* undecided */
2661 if (DIFF_PAIR_UNMERGED(p))
2662 p->status = DIFF_STATUS_UNMERGED;
2663 else if (!DIFF_FILE_VALID(p->one))
2664 p->status = DIFF_STATUS_ADDED;
2665 else if (!DIFF_FILE_VALID(p->two))
2666 p->status = DIFF_STATUS_DELETED;
2667 else if (DIFF_PAIR_TYPE_CHANGED(p))
2668 p->status = DIFF_STATUS_TYPE_CHANGED;
2669
2670 /* from this point on, we are dealing with a pair
2671 * whose both sides are valid and of the same type, i.e.
2672 * either in-place edit or rename/copy edit.
2673 */
2674 else if (DIFF_PAIR_RENAME(p)) {
2675 /*
2676 * A rename might have re-connected a broken
2677 * pair up, causing the pathnames to be the
2678 * same again. If so, that's not a rename at
2679 * all, just a modification..
2680 *
2681 * Otherwise, see if this source was used for
2682 * multiple renames, in which case we decrement
2683 * the count, and call it a copy.
2684 */
2685 if (!strcmp(p->one->path, p->two->path))
2686 p->status = DIFF_STATUS_MODIFIED;
2687 else if (--p->one->rename_used > 0)
2688 p->status = DIFF_STATUS_COPIED;
2689 else
2690 p->status = DIFF_STATUS_RENAMED;
2691 }
2692 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2693 p->one->mode != p->two->mode ||
2694 is_null_sha1(p->one->sha1))
2695 p->status = DIFF_STATUS_MODIFIED;
2696 else {
2697 /* This is a "no-change" entry and should not
2698 * happen anymore, but prepare for broken callers.
2699 */
2700 error("feeding unmodified %s to diffcore",
2701 p->one->path);
2702 p->status = DIFF_STATUS_UNKNOWN;
2703 }
2704 }
2705 diff_debug_queue("resolve-rename-copy done", q);
2706 }
2707
2708 static int check_pair_status(struct diff_filepair *p)
2709 {
2710 switch (p->status) {
2711 case DIFF_STATUS_UNKNOWN:
2712 return 0;
2713 case 0:
2714 die("internal error in diff-resolve-rename-copy");
2715 default:
2716 return 1;
2717 }
2718 }
2719
2720 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2721 {
2722 int fmt = opt->output_format;
2723
2724 if (fmt & DIFF_FORMAT_CHECKDIFF)
2725 diff_flush_checkdiff(p, opt);
2726 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2727 diff_flush_raw(p, opt);
2728 else if (fmt & DIFF_FORMAT_NAME)
2729 write_name_quoted(p->two->path, stdout, opt->line_termination);
2730 }
2731
2732 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2733 {
2734 if (fs->mode)
2735 printf(" %s mode %06o ", newdelete, fs->mode);
2736 else
2737 printf(" %s ", newdelete);
2738 write_name_quoted(fs->path, stdout, '\n');
2739 }
2740
2741
2742 static void show_mode_change(struct diff_filepair *p, int show_name)
2743 {
2744 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2745 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2746 show_name ? ' ' : '\n');
2747 if (show_name) {
2748 write_name_quoted(p->two->path, stdout, '\n');
2749 }
2750 }
2751 }
2752
2753 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2754 {
2755 char *names = pprint_rename(p->one->path, p->two->path);
2756
2757 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2758 free(names);
2759 show_mode_change(p, 0);
2760 }
2761
2762 static void diff_summary(struct diff_filepair *p)
2763 {
2764 switch(p->status) {
2765 case DIFF_STATUS_DELETED:
2766 show_file_mode_name("delete", p->one);
2767 break;
2768 case DIFF_STATUS_ADDED:
2769 show_file_mode_name("create", p->two);
2770 break;
2771 case DIFF_STATUS_COPIED:
2772 show_rename_copy("copy", p);
2773 break;
2774 case DIFF_STATUS_RENAMED:
2775 show_rename_copy("rename", p);
2776 break;
2777 default:
2778 if (p->score) {
2779 fputs(" rewrite ", stdout);
2780 write_name_quoted(p->two->path, stdout, ' ');
2781 printf("(%d%%)\n", similarity_index(p));
2782 }
2783 show_mode_change(p, !p->score);
2784 break;
2785 }
2786 }
2787
2788 struct patch_id_t {
2789 struct xdiff_emit_state xm;
2790 SHA_CTX *ctx;
2791 int patchlen;
2792 };
2793
2794 static int remove_space(char *line, int len)
2795 {
2796 int i;
2797 char *dst = line;
2798 unsigned char c;
2799
2800 for (i = 0; i < len; i++)
2801 if (!isspace((c = line[i])))
2802 *dst++ = c;
2803
2804 return dst - line;
2805 }
2806
2807 static void patch_id_consume(void *priv, char *line, unsigned long len)
2808 {
2809 struct patch_id_t *data = priv;
2810 int new_len;
2811
2812 /* Ignore line numbers when computing the SHA1 of the patch */
2813 if (!prefixcmp(line, "@@ -"))
2814 return;
2815
2816 new_len = remove_space(line, len);
2817
2818 SHA1_Update(data->ctx, line, new_len);
2819 data->patchlen += new_len;
2820 }
2821
2822 /* returns 0 upon success, and writes result into sha1 */
2823 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2824 {
2825 struct diff_queue_struct *q = &diff_queued_diff;
2826 int i;
2827 SHA_CTX ctx;
2828 struct patch_id_t data;
2829 char buffer[PATH_MAX * 4 + 20];
2830
2831 SHA1_Init(&ctx);
2832 memset(&data, 0, sizeof(struct patch_id_t));
2833 data.ctx = &ctx;
2834 data.xm.consume = patch_id_consume;
2835
2836 for (i = 0; i < q->nr; i++) {
2837 xpparam_t xpp;
2838 xdemitconf_t xecfg;
2839 xdemitcb_t ecb;
2840 mmfile_t mf1, mf2;
2841 struct diff_filepair *p = q->queue[i];
2842 int len1, len2;
2843
2844 memset(&xecfg, 0, sizeof(xecfg));
2845 if (p->status == 0)
2846 return error("internal diff status error");
2847 if (p->status == DIFF_STATUS_UNKNOWN)
2848 continue;
2849 if (diff_unmodified_pair(p))
2850 continue;
2851 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2852 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2853 continue;
2854 if (DIFF_PAIR_UNMERGED(p))
2855 continue;
2856
2857 diff_fill_sha1_info(p->one);
2858 diff_fill_sha1_info(p->two);
2859 if (fill_mmfile(&mf1, p->one) < 0 ||
2860 fill_mmfile(&mf2, p->two) < 0)
2861 return error("unable to read files to diff");
2862
2863 len1 = remove_space(p->one->path, strlen(p->one->path));
2864 len2 = remove_space(p->two->path, strlen(p->two->path));
2865 if (p->one->mode == 0)
2866 len1 = snprintf(buffer, sizeof(buffer),
2867 "diff--gita/%.*sb/%.*s"
2868 "newfilemode%06o"
2869 "---/dev/null"
2870 "+++b/%.*s",
2871 len1, p->one->path,
2872 len2, p->two->path,
2873 p->two->mode,
2874 len2, p->two->path);
2875 else if (p->two->mode == 0)
2876 len1 = snprintf(buffer, sizeof(buffer),
2877 "diff--gita/%.*sb/%.*s"
2878 "deletedfilemode%06o"
2879 "---a/%.*s"
2880 "+++/dev/null",
2881 len1, p->one->path,
2882 len2, p->two->path,
2883 p->one->mode,
2884 len1, p->one->path);
2885 else
2886 len1 = snprintf(buffer, sizeof(buffer),
2887 "diff--gita/%.*sb/%.*s"
2888 "---a/%.*s"
2889 "+++b/%.*s",
2890 len1, p->one->path,
2891 len2, p->two->path,
2892 len1, p->one->path,
2893 len2, p->two->path);
2894 SHA1_Update(&ctx, buffer, len1);
2895
2896 xpp.flags = XDF_NEED_MINIMAL;
2897 xecfg.ctxlen = 3;
2898 xecfg.flags = XDL_EMIT_FUNCNAMES;
2899 ecb.outf = xdiff_outf;
2900 ecb.priv = &data;
2901 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2902 }
2903
2904 SHA1_Final(sha1, &ctx);
2905 return 0;
2906 }
2907
2908 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2909 {
2910 struct diff_queue_struct *q = &diff_queued_diff;
2911 int i;
2912 int result = diff_get_patch_id(options, sha1);
2913
2914 for (i = 0; i < q->nr; i++)
2915 diff_free_filepair(q->queue[i]);
2916
2917 free(q->queue);
2918 q->queue = NULL;
2919 q->nr = q->alloc = 0;
2920
2921 return result;
2922 }
2923
2924 static int is_summary_empty(const struct diff_queue_struct *q)
2925 {
2926 int i;
2927
2928 for (i = 0; i < q->nr; i++) {
2929 const struct diff_filepair *p = q->queue[i];
2930
2931 switch (p->status) {
2932 case DIFF_STATUS_DELETED:
2933 case DIFF_STATUS_ADDED:
2934 case DIFF_STATUS_COPIED:
2935 case DIFF_STATUS_RENAMED:
2936 return 0;
2937 default:
2938 if (p->score)
2939 return 0;
2940 if (p->one->mode && p->two->mode &&
2941 p->one->mode != p->two->mode)
2942 return 0;
2943 break;
2944 }
2945 }
2946 return 1;
2947 }
2948
2949 void diff_flush(struct diff_options *options)
2950 {
2951 struct diff_queue_struct *q = &diff_queued_diff;
2952 int i, output_format = options->output_format;
2953 int separator = 0;
2954
2955 /*
2956 * Order: raw, stat, summary, patch
2957 * or: name/name-status/checkdiff (other bits clear)
2958 */
2959 if (!q->nr)
2960 goto free_queue;
2961
2962 if (output_format & (DIFF_FORMAT_RAW |
2963 DIFF_FORMAT_NAME |
2964 DIFF_FORMAT_NAME_STATUS |
2965 DIFF_FORMAT_CHECKDIFF)) {
2966 for (i = 0; i < q->nr; i++) {
2967 struct diff_filepair *p = q->queue[i];
2968 if (check_pair_status(p))
2969 flush_one_pair(p, options);
2970 }
2971 separator++;
2972 }
2973
2974 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2975 struct diffstat_t diffstat;
2976
2977 memset(&diffstat, 0, sizeof(struct diffstat_t));
2978 diffstat.xm.consume = diffstat_consume;
2979 for (i = 0; i < q->nr; i++) {
2980 struct diff_filepair *p = q->queue[i];
2981 if (check_pair_status(p))
2982 diff_flush_stat(p, options, &diffstat);
2983 }
2984 if (output_format & DIFF_FORMAT_NUMSTAT)
2985 show_numstat(&diffstat, options);
2986 if (output_format & DIFF_FORMAT_DIFFSTAT)
2987 show_stats(&diffstat, options);
2988 if (output_format & DIFF_FORMAT_SHORTSTAT)
2989 show_shortstats(&diffstat);
2990 free_diffstat_info(&diffstat);
2991 separator++;
2992 }
2993
2994 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2995 for (i = 0; i < q->nr; i++)
2996 diff_summary(q->queue[i]);
2997 separator++;
2998 }
2999
3000 if (output_format & DIFF_FORMAT_PATCH) {
3001 if (separator) {
3002 if (options->stat_sep) {
3003 /* attach patch instead of inline */
3004 fputs(options->stat_sep, stdout);
3005 } else {
3006 putchar(options->line_termination);
3007 }
3008 }
3009
3010 for (i = 0; i < q->nr; i++) {
3011 struct diff_filepair *p = q->queue[i];
3012 if (check_pair_status(p))
3013 diff_flush_patch(p, options);
3014 }
3015 }
3016
3017 if (output_format & DIFF_FORMAT_CALLBACK)
3018 options->format_callback(q, options, options->format_callback_data);
3019
3020 for (i = 0; i < q->nr; i++)
3021 diff_free_filepair(q->queue[i]);
3022 free_queue:
3023 free(q->queue);
3024 q->queue = NULL;
3025 q->nr = q->alloc = 0;
3026 }
3027
3028 static void diffcore_apply_filter(const char *filter)
3029 {
3030 int i;
3031 struct diff_queue_struct *q = &diff_queued_diff;
3032 struct diff_queue_struct outq;
3033 outq.queue = NULL;
3034 outq.nr = outq.alloc = 0;
3035
3036 if (!filter)
3037 return;
3038
3039 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3040 int found;
3041 for (i = found = 0; !found && i < q->nr; i++) {
3042 struct diff_filepair *p = q->queue[i];
3043 if (((p->status == DIFF_STATUS_MODIFIED) &&
3044 ((p->score &&
3045 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3046 (!p->score &&
3047 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3048 ((p->status != DIFF_STATUS_MODIFIED) &&
3049 strchr(filter, p->status)))
3050 found++;
3051 }
3052 if (found)
3053 return;
3054
3055 /* otherwise we will clear the whole queue
3056 * by copying the empty outq at the end of this
3057 * function, but first clear the current entries
3058 * in the queue.
3059 */
3060 for (i = 0; i < q->nr; i++)
3061 diff_free_filepair(q->queue[i]);
3062 }
3063 else {
3064 /* Only the matching ones */
3065 for (i = 0; i < q->nr; i++) {
3066 struct diff_filepair *p = q->queue[i];
3067
3068 if (((p->status == DIFF_STATUS_MODIFIED) &&
3069 ((p->score &&
3070 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3071 (!p->score &&
3072 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3073 ((p->status != DIFF_STATUS_MODIFIED) &&
3074 strchr(filter, p->status)))
3075 diff_q(&outq, p);
3076 else
3077 diff_free_filepair(p);
3078 }
3079 }
3080 free(q->queue);
3081 *q = outq;
3082 }
3083
3084 /* Check whether two filespecs with the same mode and size are identical */
3085 static int diff_filespec_is_identical(struct diff_filespec *one,
3086 struct diff_filespec *two)
3087 {
3088 if (S_ISGITLINK(one->mode)) {
3089 diff_fill_sha1_info(one);
3090 diff_fill_sha1_info(two);
3091 return !hashcmp(one->sha1, two->sha1);
3092 }
3093 if (diff_populate_filespec(one, 0))
3094 return 0;
3095 if (diff_populate_filespec(two, 0))
3096 return 0;
3097 return !memcmp(one->data, two->data, one->size);
3098 }
3099
3100 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3101 {
3102 int i;
3103 struct diff_queue_struct *q = &diff_queued_diff;
3104 struct diff_queue_struct outq;
3105 outq.queue = NULL;
3106 outq.nr = outq.alloc = 0;
3107
3108 for (i = 0; i < q->nr; i++) {
3109 struct diff_filepair *p = q->queue[i];
3110
3111 /*
3112 * 1. Entries that come from stat info dirtyness
3113 * always have both sides (iow, not create/delete),
3114 * one side of the object name is unknown, with
3115 * the same mode and size. Keep the ones that
3116 * do not match these criteria. They have real
3117 * differences.
3118 *
3119 * 2. At this point, the file is known to be modified,
3120 * with the same mode and size, and the object
3121 * name of one side is unknown. Need to inspect
3122 * the identical contents.
3123 */
3124 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3125 !DIFF_FILE_VALID(p->two) ||
3126 (p->one->sha1_valid && p->two->sha1_valid) ||
3127 (p->one->mode != p->two->mode) ||
3128 diff_populate_filespec(p->one, 1) ||
3129 diff_populate_filespec(p->two, 1) ||
3130 (p->one->size != p->two->size) ||
3131 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3132 diff_q(&outq, p);
3133 else {
3134 /*
3135 * The caller can subtract 1 from skip_stat_unmatch
3136 * to determine how many paths were dirty only
3137 * due to stat info mismatch.
3138 */
3139 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3140 diffopt->skip_stat_unmatch++;
3141 diff_free_filepair(p);
3142 }
3143 }
3144 free(q->queue);
3145 *q = outq;
3146 }
3147
3148 void diffcore_std(struct diff_options *options)
3149 {
3150 if (DIFF_OPT_TST(options, QUIET))
3151 return;
3152
3153 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3154 diffcore_skip_stat_unmatch(options);
3155 if (options->break_opt != -1)
3156 diffcore_break(options->break_opt);
3157 if (options->detect_rename)
3158 diffcore_rename(options);
3159 if (options->break_opt != -1)
3160 diffcore_merge_broken();
3161 if (options->pickaxe)
3162 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3163 if (options->orderfile)
3164 diffcore_order(options->orderfile);
3165 diff_resolve_rename_copy();
3166 diffcore_apply_filter(options->filter);
3167
3168 if (diff_queued_diff.nr)
3169 DIFF_OPT_SET(options, HAS_CHANGES);
3170 else
3171 DIFF_OPT_CLR(options, HAS_CHANGES);
3172 }
3173
3174
3175 void diff_addremove(struct diff_options *options,
3176 int addremove, unsigned mode,
3177 const unsigned char *sha1,
3178 const char *base, const char *path)
3179 {
3180 char concatpath[PATH_MAX];
3181 struct diff_filespec *one, *two;
3182
3183 /* This may look odd, but it is a preparation for
3184 * feeding "there are unchanged files which should
3185 * not produce diffs, but when you are doing copy
3186 * detection you would need them, so here they are"
3187 * entries to the diff-core. They will be prefixed
3188 * with something like '=' or '*' (I haven't decided
3189 * which but should not make any difference).
3190 * Feeding the same new and old to diff_change()
3191 * also has the same effect.
3192 * Before the final output happens, they are pruned after
3193 * merged into rename/copy pairs as appropriate.
3194 */
3195 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3196 addremove = (addremove == '+' ? '-' :
3197 addremove == '-' ? '+' : addremove);
3198
3199 if (!path) path = "";
3200 sprintf(concatpath, "%s%s", base, path);
3201 one = alloc_filespec(concatpath);
3202 two = alloc_filespec(concatpath);
3203
3204 if (addremove != '+')
3205 fill_filespec(one, sha1, mode);
3206 if (addremove != '-')
3207 fill_filespec(two, sha1, mode);
3208
3209 diff_queue(&diff_queued_diff, one, two);
3210 DIFF_OPT_SET(options, HAS_CHANGES);
3211 }
3212
3213 void diff_change(struct diff_options *options,
3214 unsigned old_mode, unsigned new_mode,
3215 const unsigned char *old_sha1,
3216 const unsigned char *new_sha1,
3217 const char *base, const char *path)
3218 {
3219 char concatpath[PATH_MAX];
3220 struct diff_filespec *one, *two;
3221
3222 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3223 unsigned tmp;
3224 const unsigned char *tmp_c;
3225 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3226 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3227 }
3228 if (!path) path = "";
3229 sprintf(concatpath, "%s%s", base, path);
3230 one = alloc_filespec(concatpath);
3231 two = alloc_filespec(concatpath);
3232 fill_filespec(one, old_sha1, old_mode);
3233 fill_filespec(two, new_sha1, new_mode);
3234
3235 diff_queue(&diff_queued_diff, one, two);
3236 DIFF_OPT_SET(options, HAS_CHANGES);
3237 }
3238
3239 void diff_unmerge(struct diff_options *options,
3240 const char *path,
3241 unsigned mode, const unsigned char *sha1)
3242 {
3243 struct diff_filespec *one, *two;
3244 one = alloc_filespec(path);
3245 two = alloc_filespec(path);
3246 fill_filespec(one, sha1, mode);
3247 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3248 }
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