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Fix git-fast-export for zero-sized blobs
[git/spearce.git] / diff.c
blobf780e3e8e67f4b1e07ef1d70ab3b9f101ff6b868
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 xdl_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 *name;
738 unsigned is_unmerged:1;
739 unsigned is_binary:1;
740 unsigned is_renamed:1;
741 unsigned int added, deleted;
742 } **files;
743 };
744
745 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
746 const char *name_a,
747 const char *name_b)
748 {
749 struct diffstat_file *x;
750 x = xcalloc(sizeof (*x), 1);
751 if (diffstat->nr == diffstat->alloc) {
752 diffstat->alloc = alloc_nr(diffstat->alloc);
753 diffstat->files = xrealloc(diffstat->files,
754 diffstat->alloc * sizeof(x));
755 }
756 diffstat->files[diffstat->nr++] = x;
757 if (name_b) {
758 x->name = pprint_rename(name_a, name_b);
759 x->is_renamed = 1;
760 }
761 else
762 x->name = xstrdup(name_a);
763 return x;
764 }
765
766 static void diffstat_consume(void *priv, char *line, unsigned long len)
767 {
768 struct diffstat_t *diffstat = priv;
769 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
770
771 if (line[0] == '+')
772 x->added++;
773 else if (line[0] == '-')
774 x->deleted++;
775 }
776
777 const char mime_boundary_leader[] = "------------";
778
779 static int scale_linear(int it, int width, int max_change)
780 {
781 /*
782 * make sure that at least one '-' is printed if there were deletions,
783 * and likewise for '+'.
784 */
785 if (max_change < 2)
786 return it;
787 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
788 }
789
790 static void show_name(const char *prefix, const char *name, int len,
791 const char *reset, const char *set)
792 {
793 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
794 }
795
796 static void show_graph(char ch, int cnt, const char *set, const char *reset)
797 {
798 if (cnt <= 0)
799 return;
800 printf("%s", set);
801 while (cnt--)
802 putchar(ch);
803 printf("%s", reset);
804 }
805
806 static void show_stats(struct diffstat_t* data, struct diff_options *options)
807 {
808 int i, len, add, del, total, adds = 0, dels = 0;
809 int max_change = 0, max_len = 0;
810 int total_files = data->nr;
811 int width, name_width;
812 const char *reset, *set, *add_c, *del_c;
813
814 if (data->nr == 0)
815 return;
816
817 width = options->stat_width ? options->stat_width : 80;
818 name_width = options->stat_name_width ? options->stat_name_width : 50;
819
820 /* Sanity: give at least 5 columns to the graph,
821 * but leave at least 10 columns for the name.
822 */
823 if (width < name_width + 15) {
824 if (name_width <= 25)
825 width = name_width + 15;
826 else
827 name_width = width - 15;
828 }
829
830 /* Find the longest filename and max number of changes */
831 reset = diff_get_color_opt(options, DIFF_RESET);
832 set = diff_get_color_opt(options, DIFF_PLAIN);
833 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
834 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
835
836 for (i = 0; i < data->nr; i++) {
837 struct diffstat_file *file = data->files[i];
838 int change = file->added + file->deleted;
839
840 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
841 struct strbuf buf;
842 strbuf_init(&buf, 0);
843 if (quote_c_style(file->name, &buf, NULL, 0)) {
844 free(file->name);
845 file->name = strbuf_detach(&buf, NULL);
846 } else {
847 strbuf_release(&buf);
848 }
849 }
850
851 len = strlen(file->name);
852 if (max_len < len)
853 max_len = len;
854
855 if (file->is_binary || file->is_unmerged)
856 continue;
857 if (max_change < change)
858 max_change = change;
859 }
860
861 /* Compute the width of the graph part;
862 * 10 is for one blank at the beginning of the line plus
863 * " | count " between the name and the graph.
864 *
865 * From here on, name_width is the width of the name area,
866 * and width is the width of the graph area.
867 */
868 name_width = (name_width < max_len) ? name_width : max_len;
869 if (width < (name_width + 10) + max_change)
870 width = width - (name_width + 10);
871 else
872 width = max_change;
873
874 for (i = 0; i < data->nr; i++) {
875 const char *prefix = "";
876 char *name = data->files[i]->name;
877 int added = data->files[i]->added;
878 int deleted = data->files[i]->deleted;
879 int name_len;
880
881 /*
882 * "scale" the filename
883 */
884 len = name_width;
885 name_len = strlen(name);
886 if (name_width < name_len) {
887 char *slash;
888 prefix = "...";
889 len -= 3;
890 name += name_len - len;
891 slash = strchr(name, '/');
892 if (slash)
893 name = slash;
894 }
895
896 if (data->files[i]->is_binary) {
897 show_name(prefix, name, len, reset, set);
898 printf(" Bin ");
899 printf("%s%d%s", del_c, deleted, reset);
900 printf(" -> ");
901 printf("%s%d%s", add_c, added, reset);
902 printf(" bytes");
903 printf("\n");
904 goto free_diffstat_file;
905 }
906 else if (data->files[i]->is_unmerged) {
907 show_name(prefix, name, len, reset, set);
908 printf(" Unmerged\n");
909 goto free_diffstat_file;
910 }
911 else if (!data->files[i]->is_renamed &&
912 (added + deleted == 0)) {
913 total_files--;
914 goto free_diffstat_file;
915 }
916
917 /*
918 * scale the add/delete
919 */
920 add = added;
921 del = deleted;
922 total = add + del;
923 adds += add;
924 dels += del;
925
926 if (width <= max_change) {
927 add = scale_linear(add, width, max_change);
928 del = scale_linear(del, width, max_change);
929 total = add + del;
930 }
931 show_name(prefix, name, len, reset, set);
932 printf("%5d ", added + deleted);
933 show_graph('+', add, add_c, reset);
934 show_graph('-', del, del_c, reset);
935 putchar('\n');
936 free_diffstat_file:
937 free(data->files[i]->name);
938 free(data->files[i]);
939 }
940 free(data->files);
941 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
942 set, total_files, adds, dels, reset);
943 }
944
945 static void show_shortstats(struct diffstat_t* data)
946 {
947 int i, adds = 0, dels = 0, total_files = data->nr;
948
949 if (data->nr == 0)
950 return;
951
952 for (i = 0; i < data->nr; i++) {
953 if (!data->files[i]->is_binary &&
954 !data->files[i]->is_unmerged) {
955 int added = data->files[i]->added;
956 int deleted= data->files[i]->deleted;
957 if (!data->files[i]->is_renamed &&
958 (added + deleted == 0)) {
959 total_files--;
960 } else {
961 adds += added;
962 dels += deleted;
963 }
964 }
965 free(data->files[i]->name);
966 free(data->files[i]);
967 }
968 free(data->files);
969
970 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
971 total_files, adds, dels);
972 }
973
974 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
975 {
976 int i;
977
978 for (i = 0; i < data->nr; i++) {
979 struct diffstat_file *file = data->files[i];
980
981 if (file->is_binary)
982 printf("-\t-\t");
983 else
984 printf("%d\t%d\t", file->added, file->deleted);
985 if (!file->is_renamed) {
986 write_name_quoted(file->name, stdout, options->line_termination);
987 } else {
988 fputs(file->name, stdout);
989 putchar(options->line_termination);
990 }
991 }
992 }
993
994 struct checkdiff_t {
995 struct xdiff_emit_state xm;
996 const char *filename;
997 int lineno, color_diff;
998 unsigned ws_rule;
999 };
1000
1001 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1002 {
1003 struct checkdiff_t *data = priv;
1004 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1005 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1006 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
1007
1008 if (line[0] == '+') {
1009 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
1010
1011 /* check space before tab */
1012 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
1013 if (line[i] == ' ')
1014 spaces++;
1015 if (line[i - 1] == '\t' && spaces)
1016 space_before_tab = 1;
1017
1018 /* check white space at line end */
1019 if (line[len - 1] == '\n')
1020 len--;
1021 if (isspace(line[len - 1]))
1022 white_space_at_end = 1;
1023
1024 if (space_before_tab || white_space_at_end) {
1025 printf("%s:%d: %s", data->filename, data->lineno, ws);
1026 if (space_before_tab) {
1027 printf("space before tab");
1028 if (white_space_at_end)
1029 putchar(',');
1030 }
1031 if (white_space_at_end)
1032 printf("white space at end");
1033 printf(":%s ", reset);
1034 emit_line_with_ws(1, set, reset, ws, line, len,
1035 data->ws_rule);
1036 }
1037
1038 data->lineno++;
1039 } else if (line[0] == ' ')
1040 data->lineno++;
1041 else if (line[0] == '@') {
1042 char *plus = strchr(line, '+');
1043 if (plus)
1044 data->lineno = strtol(plus, NULL, 10);
1045 else
1046 die("invalid diff");
1047 }
1048 }
1049
1050 static unsigned char *deflate_it(char *data,
1051 unsigned long size,
1052 unsigned long *result_size)
1053 {
1054 int bound;
1055 unsigned char *deflated;
1056 z_stream stream;
1057
1058 memset(&stream, 0, sizeof(stream));
1059 deflateInit(&stream, zlib_compression_level);
1060 bound = deflateBound(&stream, size);
1061 deflated = xmalloc(bound);
1062 stream.next_out = deflated;
1063 stream.avail_out = bound;
1064
1065 stream.next_in = (unsigned char *)data;
1066 stream.avail_in = size;
1067 while (deflate(&stream, Z_FINISH) == Z_OK)
1068 ; /* nothing */
1069 deflateEnd(&stream);
1070 *result_size = stream.total_out;
1071 return deflated;
1072 }
1073
1074 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1075 {
1076 void *cp;
1077 void *delta;
1078 void *deflated;
1079 void *data;
1080 unsigned long orig_size;
1081 unsigned long delta_size;
1082 unsigned long deflate_size;
1083 unsigned long data_size;
1084
1085 /* We could do deflated delta, or we could do just deflated two,
1086 * whichever is smaller.
1087 */
1088 delta = NULL;
1089 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1090 if (one->size && two->size) {
1091 delta = diff_delta(one->ptr, one->size,
1092 two->ptr, two->size,
1093 &delta_size, deflate_size);
1094 if (delta) {
1095 void *to_free = delta;
1096 orig_size = delta_size;
1097 delta = deflate_it(delta, delta_size, &delta_size);
1098 free(to_free);
1099 }
1100 }
1101
1102 if (delta && delta_size < deflate_size) {
1103 printf("delta %lu\n", orig_size);
1104 free(deflated);
1105 data = delta;
1106 data_size = delta_size;
1107 }
1108 else {
1109 printf("literal %lu\n", two->size);
1110 free(delta);
1111 data = deflated;
1112 data_size = deflate_size;
1113 }
1114
1115 /* emit data encoded in base85 */
1116 cp = data;
1117 while (data_size) {
1118 int bytes = (52 < data_size) ? 52 : data_size;
1119 char line[70];
1120 data_size -= bytes;
1121 if (bytes <= 26)
1122 line[0] = bytes + 'A' - 1;
1123 else
1124 line[0] = bytes - 26 + 'a' - 1;
1125 encode_85(line + 1, cp, bytes);
1126 cp = (char *) cp + bytes;
1127 puts(line);
1128 }
1129 printf("\n");
1130 free(data);
1131 }
1132
1133 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1134 {
1135 printf("GIT binary patch\n");
1136 emit_binary_diff_body(one, two);
1137 emit_binary_diff_body(two, one);
1138 }
1139
1140 static void setup_diff_attr_check(struct git_attr_check *check)
1141 {
1142 static struct git_attr *attr_diff;
1143
1144 if (!attr_diff) {
1145 attr_diff = git_attr("diff", 4);
1146 }
1147 check[0].attr = attr_diff;
1148 }
1149
1150 static void diff_filespec_check_attr(struct diff_filespec *one)
1151 {
1152 struct git_attr_check attr_diff_check;
1153 int check_from_data = 0;
1154
1155 if (one->checked_attr)
1156 return;
1157
1158 setup_diff_attr_check(&attr_diff_check);
1159 one->is_binary = 0;
1160 one->funcname_pattern_ident = NULL;
1161
1162 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1163 const char *value;
1164
1165 /* binaryness */
1166 value = attr_diff_check.value;
1167 if (ATTR_TRUE(value))
1168 ;
1169 else if (ATTR_FALSE(value))
1170 one->is_binary = 1;
1171 else
1172 check_from_data = 1;
1173
1174 /* funcname pattern ident */
1175 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1176 ;
1177 else
1178 one->funcname_pattern_ident = value;
1179 }
1180
1181 if (check_from_data) {
1182 if (!one->data && DIFF_FILE_VALID(one))
1183 diff_populate_filespec(one, 0);
1184
1185 if (one->data)
1186 one->is_binary = buffer_is_binary(one->data, one->size);
1187 }
1188 }
1189
1190 int diff_filespec_is_binary(struct diff_filespec *one)
1191 {
1192 diff_filespec_check_attr(one);
1193 return one->is_binary;
1194 }
1195
1196 static const char *funcname_pattern(const char *ident)
1197 {
1198 struct funcname_pattern *pp;
1199
1200 read_config_if_needed();
1201 for (pp = funcname_pattern_list; pp; pp = pp->next)
1202 if (!strcmp(ident, pp->name))
1203 return pp->pattern;
1204 return NULL;
1205 }
1206
1207 static struct builtin_funcname_pattern {
1208 const char *name;
1209 const char *pattern;
1210 } builtin_funcname_pattern[] = {
1211 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1212 "new\\|return\\|switch\\|throw\\|while\\)\n"
1213 "^[ ]*\\(\\([ ]*"
1214 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1215 "[ ]*([^;]*$\\)" },
1216 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1217 };
1218
1219 static const char *diff_funcname_pattern(struct diff_filespec *one)
1220 {
1221 const char *ident, *pattern;
1222 int i;
1223
1224 diff_filespec_check_attr(one);
1225 ident = one->funcname_pattern_ident;
1226
1227 if (!ident)
1228 /*
1229 * If the config file has "funcname.default" defined, that
1230 * regexp is used; otherwise NULL is returned and xemit uses
1231 * the built-in default.
1232 */
1233 return funcname_pattern("default");
1234
1235 /* Look up custom "funcname.$ident" regexp from config. */
1236 pattern = funcname_pattern(ident);
1237 if (pattern)
1238 return pattern;
1239
1240 /*
1241 * And define built-in fallback patterns here. Note that
1242 * these can be overriden by the user's config settings.
1243 */
1244 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1245 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1246 return builtin_funcname_pattern[i].pattern;
1247
1248 return NULL;
1249 }
1250
1251 static void builtin_diff(const char *name_a,
1252 const char *name_b,
1253 struct diff_filespec *one,
1254 struct diff_filespec *two,
1255 const char *xfrm_msg,
1256 struct diff_options *o,
1257 int complete_rewrite)
1258 {
1259 mmfile_t mf1, mf2;
1260 const char *lbl[2];
1261 char *a_one, *b_two;
1262 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1263 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1264
1265 a_one = quote_two("a/", name_a + (*name_a == '/'));
1266 b_two = quote_two("b/", name_b + (*name_b == '/'));
1267 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1268 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1269 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1270 if (lbl[0][0] == '/') {
1271 /* /dev/null */
1272 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1273 if (xfrm_msg && xfrm_msg[0])
1274 printf("%s%s%s\n", set, xfrm_msg, reset);
1275 }
1276 else if (lbl[1][0] == '/') {
1277 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1278 if (xfrm_msg && xfrm_msg[0])
1279 printf("%s%s%s\n", set, xfrm_msg, reset);
1280 }
1281 else {
1282 if (one->mode != two->mode) {
1283 printf("%sold mode %06o%s\n", set, one->mode, reset);
1284 printf("%snew mode %06o%s\n", set, two->mode, reset);
1285 }
1286 if (xfrm_msg && xfrm_msg[0])
1287 printf("%s%s%s\n", set, xfrm_msg, reset);
1288 /*
1289 * we do not run diff between different kind
1290 * of objects.
1291 */
1292 if ((one->mode ^ two->mode) & S_IFMT)
1293 goto free_ab_and_return;
1294 if (complete_rewrite) {
1295 emit_rewrite_diff(name_a, name_b, one, two,
1296 DIFF_OPT_TST(o, COLOR_DIFF));
1297 o->found_changes = 1;
1298 goto free_ab_and_return;
1299 }
1300 }
1301
1302 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1303 die("unable to read files to diff");
1304
1305 if (!DIFF_OPT_TST(o, TEXT) &&
1306 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1307 /* Quite common confusing case */
1308 if (mf1.size == mf2.size &&
1309 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1310 goto free_ab_and_return;
1311 if (DIFF_OPT_TST(o, BINARY))
1312 emit_binary_diff(&mf1, &mf2);
1313 else
1314 printf("Binary files %s and %s differ\n",
1315 lbl[0], lbl[1]);
1316 o->found_changes = 1;
1317 }
1318 else {
1319 /* Crazy xdl interfaces.. */
1320 const char *diffopts = getenv("GIT_DIFF_OPTS");
1321 xpparam_t xpp;
1322 xdemitconf_t xecfg;
1323 xdemitcb_t ecb;
1324 struct emit_callback ecbdata;
1325 const char *funcname_pattern;
1326
1327 funcname_pattern = diff_funcname_pattern(one);
1328 if (!funcname_pattern)
1329 funcname_pattern = diff_funcname_pattern(two);
1330
1331 memset(&xecfg, 0, sizeof(xecfg));
1332 memset(&ecbdata, 0, sizeof(ecbdata));
1333 ecbdata.label_path = lbl;
1334 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1335 ecbdata.found_changesp = &o->found_changes;
1336 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1337 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1338 xecfg.ctxlen = o->context;
1339 xecfg.flags = XDL_EMIT_FUNCNAMES;
1340 if (funcname_pattern)
1341 xdiff_set_find_func(&xecfg, funcname_pattern);
1342 if (!diffopts)
1343 ;
1344 else if (!prefixcmp(diffopts, "--unified="))
1345 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1346 else if (!prefixcmp(diffopts, "-u"))
1347 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1348 ecb.outf = xdiff_outf;
1349 ecb.priv = &ecbdata;
1350 ecbdata.xm.consume = fn_out_consume;
1351 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1352 ecbdata.diff_words =
1353 xcalloc(1, sizeof(struct diff_words_data));
1354 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1355 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1356 free_diff_words_data(&ecbdata);
1357 }
1358
1359 free_ab_and_return:
1360 diff_free_filespec_data(one);
1361 diff_free_filespec_data(two);
1362 free(a_one);
1363 free(b_two);
1364 return;
1365 }
1366
1367 static void builtin_diffstat(const char *name_a, const char *name_b,
1368 struct diff_filespec *one,
1369 struct diff_filespec *two,
1370 struct diffstat_t *diffstat,
1371 struct diff_options *o,
1372 int complete_rewrite)
1373 {
1374 mmfile_t mf1, mf2;
1375 struct diffstat_file *data;
1376
1377 data = diffstat_add(diffstat, name_a, name_b);
1378
1379 if (!one || !two) {
1380 data->is_unmerged = 1;
1381 return;
1382 }
1383 if (complete_rewrite) {
1384 diff_populate_filespec(one, 0);
1385 diff_populate_filespec(two, 0);
1386 data->deleted = count_lines(one->data, one->size);
1387 data->added = count_lines(two->data, two->size);
1388 goto free_and_return;
1389 }
1390 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1391 die("unable to read files to diff");
1392
1393 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1394 data->is_binary = 1;
1395 data->added = mf2.size;
1396 data->deleted = mf1.size;
1397 } else {
1398 /* Crazy xdl interfaces.. */
1399 xpparam_t xpp;
1400 xdemitconf_t xecfg;
1401 xdemitcb_t ecb;
1402
1403 memset(&xecfg, 0, sizeof(xecfg));
1404 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1405 ecb.outf = xdiff_outf;
1406 ecb.priv = diffstat;
1407 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1408 }
1409
1410 free_and_return:
1411 diff_free_filespec_data(one);
1412 diff_free_filespec_data(two);
1413 }
1414
1415 static void builtin_checkdiff(const char *name_a, const char *name_b,
1416 struct diff_filespec *one,
1417 struct diff_filespec *two, struct diff_options *o)
1418 {
1419 mmfile_t mf1, mf2;
1420 struct checkdiff_t data;
1421
1422 if (!two)
1423 return;
1424
1425 memset(&data, 0, sizeof(data));
1426 data.xm.consume = checkdiff_consume;
1427 data.filename = name_b ? name_b : name_a;
1428 data.lineno = 0;
1429 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1430 data.ws_rule = whitespace_rule(data.filename);
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(two))
1436 goto free_and_return;
1437 else {
1438 /* Crazy xdl interfaces.. */
1439 xpparam_t xpp;
1440 xdemitconf_t xecfg;
1441 xdemitcb_t ecb;
1442
1443 memset(&xecfg, 0, sizeof(xecfg));
1444 xpp.flags = XDF_NEED_MINIMAL;
1445 ecb.outf = xdiff_outf;
1446 ecb.priv = &data;
1447 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1448 }
1449 free_and_return:
1450 diff_free_filespec_data(one);
1451 diff_free_filespec_data(two);
1452 }
1453
1454 struct diff_filespec *alloc_filespec(const char *path)
1455 {
1456 int namelen = strlen(path);
1457 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1458
1459 memset(spec, 0, sizeof(*spec));
1460 spec->path = (char *)(spec + 1);
1461 memcpy(spec->path, path, namelen+1);
1462 spec->count = 1;
1463 return spec;
1464 }
1465
1466 void free_filespec(struct diff_filespec *spec)
1467 {
1468 if (!--spec->count) {
1469 diff_free_filespec_data(spec);
1470 free(spec);
1471 }
1472 }
1473
1474 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1475 unsigned short mode)
1476 {
1477 if (mode) {
1478 spec->mode = canon_mode(mode);
1479 hashcpy(spec->sha1, sha1);
1480 spec->sha1_valid = !is_null_sha1(sha1);
1481 }
1482 }
1483
1484 /*
1485 * Given a name and sha1 pair, if the index tells us the file in
1486 * the work tree has that object contents, return true, so that
1487 * prepare_temp_file() does not have to inflate and extract.
1488 */
1489 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1490 {
1491 struct cache_entry *ce;
1492 struct stat st;
1493 int pos, len;
1494
1495 /* We do not read the cache ourselves here, because the
1496 * benchmark with my previous version that always reads cache
1497 * shows that it makes things worse for diff-tree comparing
1498 * two linux-2.6 kernel trees in an already checked out work
1499 * tree. This is because most diff-tree comparisons deal with
1500 * only a small number of files, while reading the cache is
1501 * expensive for a large project, and its cost outweighs the
1502 * savings we get by not inflating the object to a temporary
1503 * file. Practically, this code only helps when we are used
1504 * by diff-cache --cached, which does read the cache before
1505 * calling us.
1506 */
1507 if (!active_cache)
1508 return 0;
1509
1510 /* We want to avoid the working directory if our caller
1511 * doesn't need the data in a normal file, this system
1512 * is rather slow with its stat/open/mmap/close syscalls,
1513 * and the object is contained in a pack file. The pack
1514 * is probably already open and will be faster to obtain
1515 * the data through than the working directory. Loose
1516 * objects however would tend to be slower as they need
1517 * to be individually opened and inflated.
1518 */
1519 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1520 return 0;
1521
1522 len = strlen(name);
1523 pos = cache_name_pos(name, len);
1524 if (pos < 0)
1525 return 0;
1526 ce = active_cache[pos];
1527 if ((lstat(name, &st) < 0) ||
1528 !S_ISREG(st.st_mode) || /* careful! */
1529 ce_match_stat(ce, &st, 0) ||
1530 hashcmp(sha1, ce->sha1))
1531 return 0;
1532 /* we return 1 only when we can stat, it is a regular file,
1533 * stat information matches, and sha1 recorded in the cache
1534 * matches. I.e. we know the file in the work tree really is
1535 * the same as the <name, sha1> pair.
1536 */
1537 return 1;
1538 }
1539
1540 static int populate_from_stdin(struct diff_filespec *s)
1541 {
1542 struct strbuf buf;
1543 size_t size = 0;
1544
1545 strbuf_init(&buf, 0);
1546 if (strbuf_read(&buf, 0, 0) < 0)
1547 return error("error while reading from stdin %s",
1548 strerror(errno));
1549
1550 s->should_munmap = 0;
1551 s->data = strbuf_detach(&buf, &size);
1552 s->size = size;
1553 s->should_free = 1;
1554 return 0;
1555 }
1556
1557 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1558 {
1559 int len;
1560 char *data = xmalloc(100);
1561 len = snprintf(data, 100,
1562 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1563 s->data = data;
1564 s->size = len;
1565 s->should_free = 1;
1566 if (size_only) {
1567 s->data = NULL;
1568 free(data);
1569 }
1570 return 0;
1571 }
1572
1573 /*
1574 * While doing rename detection and pickaxe operation, we may need to
1575 * grab the data for the blob (or file) for our own in-core comparison.
1576 * diff_filespec has data and size fields for this purpose.
1577 */
1578 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1579 {
1580 int err = 0;
1581 if (!DIFF_FILE_VALID(s))
1582 die("internal error: asking to populate invalid file.");
1583 if (S_ISDIR(s->mode))
1584 return -1;
1585
1586 if (s->data)
1587 return 0;
1588
1589 if (size_only && 0 < s->size)
1590 return 0;
1591
1592 if (S_ISGITLINK(s->mode))
1593 return diff_populate_gitlink(s, size_only);
1594
1595 if (!s->sha1_valid ||
1596 reuse_worktree_file(s->path, s->sha1, 0)) {
1597 struct strbuf buf;
1598 struct stat st;
1599 int fd;
1600
1601 if (!strcmp(s->path, "-"))
1602 return populate_from_stdin(s);
1603
1604 if (lstat(s->path, &st) < 0) {
1605 if (errno == ENOENT) {
1606 err_empty:
1607 err = -1;
1608 empty:
1609 s->data = (char *)"";
1610 s->size = 0;
1611 return err;
1612 }
1613 }
1614 s->size = xsize_t(st.st_size);
1615 if (!s->size)
1616 goto empty;
1617 if (size_only)
1618 return 0;
1619 if (S_ISLNK(st.st_mode)) {
1620 int ret;
1621 s->data = xmalloc(s->size);
1622 s->should_free = 1;
1623 ret = readlink(s->path, s->data, s->size);
1624 if (ret < 0) {
1625 free(s->data);
1626 goto err_empty;
1627 }
1628 return 0;
1629 }
1630 fd = open(s->path, O_RDONLY);
1631 if (fd < 0)
1632 goto err_empty;
1633 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1634 close(fd);
1635 s->should_munmap = 1;
1636
1637 /*
1638 * Convert from working tree format to canonical git format
1639 */
1640 strbuf_init(&buf, 0);
1641 if (convert_to_git(s->path, s->data, s->size, &buf)) {
1642 size_t size = 0;
1643 munmap(s->data, s->size);
1644 s->should_munmap = 0;
1645 s->data = strbuf_detach(&buf, &size);
1646 s->size = size;
1647 s->should_free = 1;
1648 }
1649 }
1650 else {
1651 enum object_type type;
1652 if (size_only)
1653 type = sha1_object_info(s->sha1, &s->size);
1654 else {
1655 s->data = read_sha1_file(s->sha1, &type, &s->size);
1656 s->should_free = 1;
1657 }
1658 }
1659 return 0;
1660 }
1661
1662 void diff_free_filespec_blob(struct diff_filespec *s)
1663 {
1664 if (s->should_free)
1665 free(s->data);
1666 else if (s->should_munmap)
1667 munmap(s->data, s->size);
1668
1669 if (s->should_free || s->should_munmap) {
1670 s->should_free = s->should_munmap = 0;
1671 s->data = NULL;
1672 }
1673 }
1674
1675 void diff_free_filespec_data(struct diff_filespec *s)
1676 {
1677 diff_free_filespec_blob(s);
1678 free(s->cnt_data);
1679 s->cnt_data = NULL;
1680 }
1681
1682 static void prep_temp_blob(struct diff_tempfile *temp,
1683 void *blob,
1684 unsigned long size,
1685 const unsigned char *sha1,
1686 int mode)
1687 {
1688 int fd;
1689
1690 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1691 if (fd < 0)
1692 die("unable to create temp-file: %s", strerror(errno));
1693 if (write_in_full(fd, blob, size) != size)
1694 die("unable to write temp-file");
1695 close(fd);
1696 temp->name = temp->tmp_path;
1697 strcpy(temp->hex, sha1_to_hex(sha1));
1698 temp->hex[40] = 0;
1699 sprintf(temp->mode, "%06o", mode);
1700 }
1701
1702 static void prepare_temp_file(const char *name,
1703 struct diff_tempfile *temp,
1704 struct diff_filespec *one)
1705 {
1706 if (!DIFF_FILE_VALID(one)) {
1707 not_a_valid_file:
1708 /* A '-' entry produces this for file-2, and
1709 * a '+' entry produces this for file-1.
1710 */
1711 temp->name = "/dev/null";
1712 strcpy(temp->hex, ".");
1713 strcpy(temp->mode, ".");
1714 return;
1715 }
1716
1717 if (!one->sha1_valid ||
1718 reuse_worktree_file(name, one->sha1, 1)) {
1719 struct stat st;
1720 if (lstat(name, &st) < 0) {
1721 if (errno == ENOENT)
1722 goto not_a_valid_file;
1723 die("stat(%s): %s", name, strerror(errno));
1724 }
1725 if (S_ISLNK(st.st_mode)) {
1726 int ret;
1727 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1728 size_t sz = xsize_t(st.st_size);
1729 if (sizeof(buf) <= st.st_size)
1730 die("symlink too long: %s", name);
1731 ret = readlink(name, buf, sz);
1732 if (ret < 0)
1733 die("readlink(%s)", name);
1734 prep_temp_blob(temp, buf, sz,
1735 (one->sha1_valid ?
1736 one->sha1 : null_sha1),
1737 (one->sha1_valid ?
1738 one->mode : S_IFLNK));
1739 }
1740 else {
1741 /* we can borrow from the file in the work tree */
1742 temp->name = name;
1743 if (!one->sha1_valid)
1744 strcpy(temp->hex, sha1_to_hex(null_sha1));
1745 else
1746 strcpy(temp->hex, sha1_to_hex(one->sha1));
1747 /* Even though we may sometimes borrow the
1748 * contents from the work tree, we always want
1749 * one->mode. mode is trustworthy even when
1750 * !(one->sha1_valid), as long as
1751 * DIFF_FILE_VALID(one).
1752 */
1753 sprintf(temp->mode, "%06o", one->mode);
1754 }
1755 return;
1756 }
1757 else {
1758 if (diff_populate_filespec(one, 0))
1759 die("cannot read data blob for %s", one->path);
1760 prep_temp_blob(temp, one->data, one->size,
1761 one->sha1, one->mode);
1762 }
1763 }
1764
1765 static void remove_tempfile(void)
1766 {
1767 int i;
1768
1769 for (i = 0; i < 2; i++)
1770 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1771 unlink(diff_temp[i].name);
1772 diff_temp[i].name = NULL;
1773 }
1774 }
1775
1776 static void remove_tempfile_on_signal(int signo)
1777 {
1778 remove_tempfile();
1779 signal(SIGINT, SIG_DFL);
1780 raise(signo);
1781 }
1782
1783 /* An external diff command takes:
1784 *
1785 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1786 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1787 *
1788 */
1789 static void run_external_diff(const char *pgm,
1790 const char *name,
1791 const char *other,
1792 struct diff_filespec *one,
1793 struct diff_filespec *two,
1794 const char *xfrm_msg,
1795 int complete_rewrite)
1796 {
1797 const char *spawn_arg[10];
1798 struct diff_tempfile *temp = diff_temp;
1799 int retval;
1800 static int atexit_asked = 0;
1801 const char *othername;
1802 const char **arg = &spawn_arg[0];
1803
1804 othername = (other? other : name);
1805 if (one && two) {
1806 prepare_temp_file(name, &temp[0], one);
1807 prepare_temp_file(othername, &temp[1], two);
1808 if (! atexit_asked &&
1809 (temp[0].name == temp[0].tmp_path ||
1810 temp[1].name == temp[1].tmp_path)) {
1811 atexit_asked = 1;
1812 atexit(remove_tempfile);
1813 }
1814 signal(SIGINT, remove_tempfile_on_signal);
1815 }
1816
1817 if (one && two) {
1818 *arg++ = pgm;
1819 *arg++ = name;
1820 *arg++ = temp[0].name;
1821 *arg++ = temp[0].hex;
1822 *arg++ = temp[0].mode;
1823 *arg++ = temp[1].name;
1824 *arg++ = temp[1].hex;
1825 *arg++ = temp[1].mode;
1826 if (other) {
1827 *arg++ = other;
1828 *arg++ = xfrm_msg;
1829 }
1830 } else {
1831 *arg++ = pgm;
1832 *arg++ = name;
1833 }
1834 *arg = NULL;
1835 fflush(NULL);
1836 retval = run_command_v_opt(spawn_arg, 0);
1837 remove_tempfile();
1838 if (retval) {
1839 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1840 exit(1);
1841 }
1842 }
1843
1844 static const char *external_diff_attr(const char *name)
1845 {
1846 struct git_attr_check attr_diff_check;
1847
1848 setup_diff_attr_check(&attr_diff_check);
1849 if (!git_checkattr(name, 1, &attr_diff_check)) {
1850 const char *value = attr_diff_check.value;
1851 if (!ATTR_TRUE(value) &&
1852 !ATTR_FALSE(value) &&
1853 !ATTR_UNSET(value)) {
1854 struct ll_diff_driver *drv;
1855
1856 read_config_if_needed();
1857 for (drv = user_diff; drv; drv = drv->next)
1858 if (!strcmp(drv->name, value))
1859 return drv->cmd;
1860 }
1861 }
1862 return NULL;
1863 }
1864
1865 static void run_diff_cmd(const char *pgm,
1866 const char *name,
1867 const char *other,
1868 struct diff_filespec *one,
1869 struct diff_filespec *two,
1870 const char *xfrm_msg,
1871 struct diff_options *o,
1872 int complete_rewrite)
1873 {
1874 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
1875 pgm = NULL;
1876 else {
1877 const char *cmd = external_diff_attr(name);
1878 if (cmd)
1879 pgm = cmd;
1880 }
1881
1882 if (pgm) {
1883 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1884 complete_rewrite);
1885 return;
1886 }
1887 if (one && two)
1888 builtin_diff(name, other ? other : name,
1889 one, two, xfrm_msg, o, complete_rewrite);
1890 else
1891 printf("* Unmerged path %s\n", name);
1892 }
1893
1894 static void diff_fill_sha1_info(struct diff_filespec *one)
1895 {
1896 if (DIFF_FILE_VALID(one)) {
1897 if (!one->sha1_valid) {
1898 struct stat st;
1899 if (!strcmp(one->path, "-")) {
1900 hashcpy(one->sha1, null_sha1);
1901 return;
1902 }
1903 if (lstat(one->path, &st) < 0)
1904 die("stat %s", one->path);
1905 if (index_path(one->sha1, one->path, &st, 0))
1906 die("cannot hash %s\n", one->path);
1907 }
1908 }
1909 else
1910 hashclr(one->sha1);
1911 }
1912
1913 static int similarity_index(struct diff_filepair *p)
1914 {
1915 return p->score * 100 / MAX_SCORE;
1916 }
1917
1918 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1919 {
1920 const char *pgm = external_diff();
1921 struct strbuf msg;
1922 char *xfrm_msg;
1923 struct diff_filespec *one = p->one;
1924 struct diff_filespec *two = p->two;
1925 const char *name;
1926 const char *other;
1927 int complete_rewrite = 0;
1928
1929
1930 if (DIFF_PAIR_UNMERGED(p)) {
1931 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1932 return;
1933 }
1934
1935 name = p->one->path;
1936 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1937 diff_fill_sha1_info(one);
1938 diff_fill_sha1_info(two);
1939
1940 strbuf_init(&msg, PATH_MAX * 2 + 300);
1941 switch (p->status) {
1942 case DIFF_STATUS_COPIED:
1943 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1944 strbuf_addstr(&msg, "\ncopy from ");
1945 quote_c_style(name, &msg, NULL, 0);
1946 strbuf_addstr(&msg, "\ncopy to ");
1947 quote_c_style(other, &msg, NULL, 0);
1948 strbuf_addch(&msg, '\n');
1949 break;
1950 case DIFF_STATUS_RENAMED:
1951 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1952 strbuf_addstr(&msg, "\nrename from ");
1953 quote_c_style(name, &msg, NULL, 0);
1954 strbuf_addstr(&msg, "\nrename to ");
1955 quote_c_style(other, &msg, NULL, 0);
1956 strbuf_addch(&msg, '\n');
1957 break;
1958 case DIFF_STATUS_MODIFIED:
1959 if (p->score) {
1960 strbuf_addf(&msg, "dissimilarity index %d%%\n",
1961 similarity_index(p));
1962 complete_rewrite = 1;
1963 break;
1964 }
1965 /* fallthru */
1966 default:
1967 /* nothing */
1968 ;
1969 }
1970
1971 if (hashcmp(one->sha1, two->sha1)) {
1972 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
1973
1974 if (DIFF_OPT_TST(o, BINARY)) {
1975 mmfile_t mf;
1976 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
1977 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
1978 abbrev = 40;
1979 }
1980 strbuf_addf(&msg, "index %.*s..%.*s",
1981 abbrev, sha1_to_hex(one->sha1),
1982 abbrev, sha1_to_hex(two->sha1));
1983 if (one->mode == two->mode)
1984 strbuf_addf(&msg, " %06o", one->mode);
1985 strbuf_addch(&msg, '\n');
1986 }
1987
1988 if (msg.len)
1989 strbuf_setlen(&msg, msg.len - 1);
1990 xfrm_msg = msg.len ? msg.buf : NULL;
1991
1992 if (!pgm &&
1993 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1994 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1995 /* a filepair that changes between file and symlink
1996 * needs to be split into deletion and creation.
1997 */
1998 struct diff_filespec *null = alloc_filespec(two->path);
1999 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
2000 free(null);
2001 null = alloc_filespec(one->path);
2002 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
2003 free(null);
2004 }
2005 else
2006 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
2007 complete_rewrite);
2008
2009 strbuf_release(&msg);
2010 }
2011
2012 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2013 struct diffstat_t *diffstat)
2014 {
2015 const char *name;
2016 const char *other;
2017 int complete_rewrite = 0;
2018
2019 if (DIFF_PAIR_UNMERGED(p)) {
2020 /* unmerged */
2021 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2022 return;
2023 }
2024
2025 name = p->one->path;
2026 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2027
2028 diff_fill_sha1_info(p->one);
2029 diff_fill_sha1_info(p->two);
2030
2031 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2032 complete_rewrite = 1;
2033 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2034 }
2035
2036 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2037 {
2038 const char *name;
2039 const char *other;
2040
2041 if (DIFF_PAIR_UNMERGED(p)) {
2042 /* unmerged */
2043 return;
2044 }
2045
2046 name = p->one->path;
2047 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2048
2049 diff_fill_sha1_info(p->one);
2050 diff_fill_sha1_info(p->two);
2051
2052 builtin_checkdiff(name, other, p->one, p->two, o);
2053 }
2054
2055 void diff_setup(struct diff_options *options)
2056 {
2057 memset(options, 0, sizeof(*options));
2058 options->line_termination = '\n';
2059 options->break_opt = -1;
2060 options->rename_limit = -1;
2061 options->context = 3;
2062 options->msg_sep = "";
2063
2064 options->change = diff_change;
2065 options->add_remove = diff_addremove;
2066 if (diff_use_color_default)
2067 DIFF_OPT_SET(options, COLOR_DIFF);
2068 else
2069 DIFF_OPT_CLR(options, COLOR_DIFF);
2070 options->detect_rename = diff_detect_rename_default;
2071 }
2072
2073 int diff_setup_done(struct diff_options *options)
2074 {
2075 int count = 0;
2076
2077 if (options->output_format & DIFF_FORMAT_NAME)
2078 count++;
2079 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2080 count++;
2081 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2082 count++;
2083 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2084 count++;
2085 if (count > 1)
2086 die("--name-only, --name-status, --check and -s are mutually exclusive");
2087
2088 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2089 options->detect_rename = DIFF_DETECT_COPY;
2090
2091 if (options->output_format & (DIFF_FORMAT_NAME |
2092 DIFF_FORMAT_NAME_STATUS |
2093 DIFF_FORMAT_CHECKDIFF |
2094 DIFF_FORMAT_NO_OUTPUT))
2095 options->output_format &= ~(DIFF_FORMAT_RAW |
2096 DIFF_FORMAT_NUMSTAT |
2097 DIFF_FORMAT_DIFFSTAT |
2098 DIFF_FORMAT_SHORTSTAT |
2099 DIFF_FORMAT_SUMMARY |
2100 DIFF_FORMAT_PATCH);
2101
2102 /*
2103 * These cases always need recursive; we do not drop caller-supplied
2104 * recursive bits for other formats here.
2105 */
2106 if (options->output_format & (DIFF_FORMAT_PATCH |
2107 DIFF_FORMAT_NUMSTAT |
2108 DIFF_FORMAT_DIFFSTAT |
2109 DIFF_FORMAT_SHORTSTAT |
2110 DIFF_FORMAT_SUMMARY |
2111 DIFF_FORMAT_CHECKDIFF))
2112 DIFF_OPT_SET(options, RECURSIVE);
2113 /*
2114 * Also pickaxe would not work very well if you do not say recursive
2115 */
2116 if (options->pickaxe)
2117 DIFF_OPT_SET(options, RECURSIVE);
2118
2119 if (options->detect_rename && options->rename_limit < 0)
2120 options->rename_limit = diff_rename_limit_default;
2121 if (options->setup & DIFF_SETUP_USE_CACHE) {
2122 if (!active_cache)
2123 /* read-cache does not die even when it fails
2124 * so it is safe for us to do this here. Also
2125 * it does not smudge active_cache or active_nr
2126 * when it fails, so we do not have to worry about
2127 * cleaning it up ourselves either.
2128 */
2129 read_cache();
2130 }
2131 if (options->abbrev <= 0 || 40 < options->abbrev)
2132 options->abbrev = 40; /* full */
2133
2134 /*
2135 * It does not make sense to show the first hit we happened
2136 * to have found. It does not make sense not to return with
2137 * exit code in such a case either.
2138 */
2139 if (DIFF_OPT_TST(options, QUIET)) {
2140 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2141 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2142 }
2143
2144 /*
2145 * If we postprocess in diffcore, we cannot simply return
2146 * upon the first hit. We need to run diff as usual.
2147 */
2148 if (options->pickaxe || options->filter)
2149 DIFF_OPT_CLR(options, QUIET);
2150
2151 return 0;
2152 }
2153
2154 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2155 {
2156 char c, *eq;
2157 int len;
2158
2159 if (*arg != '-')
2160 return 0;
2161 c = *++arg;
2162 if (!c)
2163 return 0;
2164 if (c == arg_short) {
2165 c = *++arg;
2166 if (!c)
2167 return 1;
2168 if (val && isdigit(c)) {
2169 char *end;
2170 int n = strtoul(arg, &end, 10);
2171 if (*end)
2172 return 0;
2173 *val = n;
2174 return 1;
2175 }
2176 return 0;
2177 }
2178 if (c != '-')
2179 return 0;
2180 arg++;
2181 eq = strchr(arg, '=');
2182 if (eq)
2183 len = eq - arg;
2184 else
2185 len = strlen(arg);
2186 if (!len || strncmp(arg, arg_long, len))
2187 return 0;
2188 if (eq) {
2189 int n;
2190 char *end;
2191 if (!isdigit(*++eq))
2192 return 0;
2193 n = strtoul(eq, &end, 10);
2194 if (*end)
2195 return 0;
2196 *val = n;
2197 }
2198 return 1;
2199 }
2200
2201 static int diff_scoreopt_parse(const char *opt);
2202
2203 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2204 {
2205 const char *arg = av[0];
2206
2207 /* Output format options */
2208 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2209 options->output_format |= DIFF_FORMAT_PATCH;
2210 else if (opt_arg(arg, 'U', "unified", &options->context))
2211 options->output_format |= DIFF_FORMAT_PATCH;
2212 else if (!strcmp(arg, "--raw"))
2213 options->output_format |= DIFF_FORMAT_RAW;
2214 else if (!strcmp(arg, "--patch-with-raw"))
2215 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2216 else if (!strcmp(arg, "--numstat"))
2217 options->output_format |= DIFF_FORMAT_NUMSTAT;
2218 else if (!strcmp(arg, "--shortstat"))
2219 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2220 else if (!strcmp(arg, "--check"))
2221 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2222 else if (!strcmp(arg, "--summary"))
2223 options->output_format |= DIFF_FORMAT_SUMMARY;
2224 else if (!strcmp(arg, "--patch-with-stat"))
2225 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2226 else if (!strcmp(arg, "--name-only"))
2227 options->output_format |= DIFF_FORMAT_NAME;
2228 else if (!strcmp(arg, "--name-status"))
2229 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2230 else if (!strcmp(arg, "-s"))
2231 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2232 else if (!prefixcmp(arg, "--stat")) {
2233 char *end;
2234 int width = options->stat_width;
2235 int name_width = options->stat_name_width;
2236 arg += 6;
2237 end = (char *)arg;
2238
2239 switch (*arg) {
2240 case '-':
2241 if (!prefixcmp(arg, "-width="))
2242 width = strtoul(arg + 7, &end, 10);
2243 else if (!prefixcmp(arg, "-name-width="))
2244 name_width = strtoul(arg + 12, &end, 10);
2245 break;
2246 case '=':
2247 width = strtoul(arg+1, &end, 10);
2248 if (*end == ',')
2249 name_width = strtoul(end+1, &end, 10);
2250 }
2251
2252 /* Important! This checks all the error cases! */
2253 if (*end)
2254 return 0;
2255 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2256 options->stat_name_width = name_width;
2257 options->stat_width = width;
2258 }
2259
2260 /* renames options */
2261 else if (!prefixcmp(arg, "-B")) {
2262 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2263 return -1;
2264 }
2265 else if (!prefixcmp(arg, "-M")) {
2266 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2267 return -1;
2268 options->detect_rename = DIFF_DETECT_RENAME;
2269 }
2270 else if (!prefixcmp(arg, "-C")) {
2271 if (options->detect_rename == DIFF_DETECT_COPY)
2272 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2273 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2274 return -1;
2275 options->detect_rename = DIFF_DETECT_COPY;
2276 }
2277 else if (!strcmp(arg, "--no-renames"))
2278 options->detect_rename = 0;
2279
2280 /* xdiff options */
2281 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2282 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2283 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2284 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2285 else if (!strcmp(arg, "--ignore-space-at-eol"))
2286 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2287
2288 /* flags options */
2289 else if (!strcmp(arg, "--binary")) {
2290 options->output_format |= DIFF_FORMAT_PATCH;
2291 DIFF_OPT_SET(options, BINARY);
2292 }
2293 else if (!strcmp(arg, "--full-index"))
2294 DIFF_OPT_SET(options, FULL_INDEX);
2295 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2296 DIFF_OPT_SET(options, TEXT);
2297 else if (!strcmp(arg, "-R"))
2298 DIFF_OPT_SET(options, REVERSE_DIFF);
2299 else if (!strcmp(arg, "--find-copies-harder"))
2300 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2301 else if (!strcmp(arg, "--follow"))
2302 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2303 else if (!strcmp(arg, "--color"))
2304 DIFF_OPT_SET(options, COLOR_DIFF);
2305 else if (!strcmp(arg, "--no-color"))
2306 DIFF_OPT_CLR(options, COLOR_DIFF);
2307 else if (!strcmp(arg, "--color-words"))
2308 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2309 else if (!strcmp(arg, "--exit-code"))
2310 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2311 else if (!strcmp(arg, "--quiet"))
2312 DIFF_OPT_SET(options, QUIET);
2313 else if (!strcmp(arg, "--ext-diff"))
2314 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2315 else if (!strcmp(arg, "--no-ext-diff"))
2316 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2317
2318 /* misc options */
2319 else if (!strcmp(arg, "-z"))
2320 options->line_termination = 0;
2321 else if (!prefixcmp(arg, "-l"))
2322 options->rename_limit = strtoul(arg+2, NULL, 10);
2323 else if (!prefixcmp(arg, "-S"))
2324 options->pickaxe = arg + 2;
2325 else if (!strcmp(arg, "--pickaxe-all"))
2326 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2327 else if (!strcmp(arg, "--pickaxe-regex"))
2328 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2329 else if (!prefixcmp(arg, "-O"))
2330 options->orderfile = arg + 2;
2331 else if (!prefixcmp(arg, "--diff-filter="))
2332 options->filter = arg + 14;
2333 else if (!strcmp(arg, "--abbrev"))
2334 options->abbrev = DEFAULT_ABBREV;
2335 else if (!prefixcmp(arg, "--abbrev=")) {
2336 options->abbrev = strtoul(arg + 9, NULL, 10);
2337 if (options->abbrev < MINIMUM_ABBREV)
2338 options->abbrev = MINIMUM_ABBREV;
2339 else if (40 < options->abbrev)
2340 options->abbrev = 40;
2341 }
2342 else
2343 return 0;
2344 return 1;
2345 }
2346
2347 static int parse_num(const char **cp_p)
2348 {
2349 unsigned long num, scale;
2350 int ch, dot;
2351 const char *cp = *cp_p;
2352
2353 num = 0;
2354 scale = 1;
2355 dot = 0;
2356 for(;;) {
2357 ch = *cp;
2358 if ( !dot && ch == '.' ) {
2359 scale = 1;
2360 dot = 1;
2361 } else if ( ch == '%' ) {
2362 scale = dot ? scale*100 : 100;
2363 cp++; /* % is always at the end */
2364 break;
2365 } else if ( ch >= '0' && ch <= '9' ) {
2366 if ( scale < 100000 ) {
2367 scale *= 10;
2368 num = (num*10) + (ch-'0');
2369 }
2370 } else {
2371 break;
2372 }
2373 cp++;
2374 }
2375 *cp_p = cp;
2376
2377 /* user says num divided by scale and we say internally that
2378 * is MAX_SCORE * num / scale.
2379 */
2380 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2381 }
2382
2383 static int diff_scoreopt_parse(const char *opt)
2384 {
2385 int opt1, opt2, cmd;
2386
2387 if (*opt++ != '-')
2388 return -1;
2389 cmd = *opt++;
2390 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2391 return -1; /* that is not a -M, -C nor -B option */
2392
2393 opt1 = parse_num(&opt);
2394 if (cmd != 'B')
2395 opt2 = 0;
2396 else {
2397 if (*opt == 0)
2398 opt2 = 0;
2399 else if (*opt != '/')
2400 return -1; /* we expect -B80/99 or -B80 */
2401 else {
2402 opt++;
2403 opt2 = parse_num(&opt);
2404 }
2405 }
2406 if (*opt != 0)
2407 return -1;
2408 return opt1 | (opt2 << 16);
2409 }
2410
2411 struct diff_queue_struct diff_queued_diff;
2412
2413 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2414 {
2415 if (queue->alloc <= queue->nr) {
2416 queue->alloc = alloc_nr(queue->alloc);
2417 queue->queue = xrealloc(queue->queue,
2418 sizeof(dp) * queue->alloc);
2419 }
2420 queue->queue[queue->nr++] = dp;
2421 }
2422
2423 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2424 struct diff_filespec *one,
2425 struct diff_filespec *two)
2426 {
2427 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2428 dp->one = one;
2429 dp->two = two;
2430 if (queue)
2431 diff_q(queue, dp);
2432 return dp;
2433 }
2434
2435 void diff_free_filepair(struct diff_filepair *p)
2436 {
2437 free_filespec(p->one);
2438 free_filespec(p->two);
2439 free(p);
2440 }
2441
2442 /* This is different from find_unique_abbrev() in that
2443 * it stuffs the result with dots for alignment.
2444 */
2445 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2446 {
2447 int abblen;
2448 const char *abbrev;
2449 if (len == 40)
2450 return sha1_to_hex(sha1);
2451
2452 abbrev = find_unique_abbrev(sha1, len);
2453 if (!abbrev)
2454 return sha1_to_hex(sha1);
2455 abblen = strlen(abbrev);
2456 if (abblen < 37) {
2457 static char hex[41];
2458 if (len < abblen && abblen <= len + 2)
2459 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2460 else
2461 sprintf(hex, "%s...", abbrev);
2462 return hex;
2463 }
2464 return sha1_to_hex(sha1);
2465 }
2466
2467 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2468 {
2469 int line_termination = opt->line_termination;
2470 int inter_name_termination = line_termination ? '\t' : '\0';
2471
2472 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2473 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2474 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2475 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2476 }
2477 if (p->score) {
2478 printf("%c%03d%c", p->status, similarity_index(p),
2479 inter_name_termination);
2480 } else {
2481 printf("%c%c", p->status, inter_name_termination);
2482 }
2483
2484 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2485 write_name_quoted(p->one->path, stdout, inter_name_termination);
2486 write_name_quoted(p->two->path, stdout, line_termination);
2487 } else {
2488 const char *path = p->one->mode ? p->one->path : p->two->path;
2489 write_name_quoted(path, stdout, line_termination);
2490 }
2491 }
2492
2493 int diff_unmodified_pair(struct diff_filepair *p)
2494 {
2495 /* This function is written stricter than necessary to support
2496 * the currently implemented transformers, but the idea is to
2497 * let transformers to produce diff_filepairs any way they want,
2498 * and filter and clean them up here before producing the output.
2499 */
2500 struct diff_filespec *one = p->one, *two = p->two;
2501
2502 if (DIFF_PAIR_UNMERGED(p))
2503 return 0; /* unmerged is interesting */
2504
2505 /* deletion, addition, mode or type change
2506 * and rename are all interesting.
2507 */
2508 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2509 DIFF_PAIR_MODE_CHANGED(p) ||
2510 strcmp(one->path, two->path))
2511 return 0;
2512
2513 /* both are valid and point at the same path. that is, we are
2514 * dealing with a change.
2515 */
2516 if (one->sha1_valid && two->sha1_valid &&
2517 !hashcmp(one->sha1, two->sha1))
2518 return 1; /* no change */
2519 if (!one->sha1_valid && !two->sha1_valid)
2520 return 1; /* both look at the same file on the filesystem. */
2521 return 0;
2522 }
2523
2524 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2525 {
2526 if (diff_unmodified_pair(p))
2527 return;
2528
2529 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2530 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2531 return; /* no tree diffs in patch format */
2532
2533 run_diff(p, o);
2534 }
2535
2536 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2537 struct diffstat_t *diffstat)
2538 {
2539 if (diff_unmodified_pair(p))
2540 return;
2541
2542 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2543 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2544 return; /* no tree diffs in patch format */
2545
2546 run_diffstat(p, o, diffstat);
2547 }
2548
2549 static void diff_flush_checkdiff(struct diff_filepair *p,
2550 struct diff_options *o)
2551 {
2552 if (diff_unmodified_pair(p))
2553 return;
2554
2555 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2556 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2557 return; /* no tree diffs in patch format */
2558
2559 run_checkdiff(p, o);
2560 }
2561
2562 int diff_queue_is_empty(void)
2563 {
2564 struct diff_queue_struct *q = &diff_queued_diff;
2565 int i;
2566 for (i = 0; i < q->nr; i++)
2567 if (!diff_unmodified_pair(q->queue[i]))
2568 return 0;
2569 return 1;
2570 }
2571
2572 #if DIFF_DEBUG
2573 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2574 {
2575 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2576 x, one ? one : "",
2577 s->path,
2578 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2579 s->mode,
2580 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2581 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2582 x, one ? one : "",
2583 s->size, s->xfrm_flags);
2584 }
2585
2586 void diff_debug_filepair(const struct diff_filepair *p, int i)
2587 {
2588 diff_debug_filespec(p->one, i, "one");
2589 diff_debug_filespec(p->two, i, "two");
2590 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2591 p->score, p->status ? p->status : '?',
2592 p->one->rename_used, p->broken_pair);
2593 }
2594
2595 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2596 {
2597 int i;
2598 if (msg)
2599 fprintf(stderr, "%s\n", msg);
2600 fprintf(stderr, "q->nr = %d\n", q->nr);
2601 for (i = 0; i < q->nr; i++) {
2602 struct diff_filepair *p = q->queue[i];
2603 diff_debug_filepair(p, i);
2604 }
2605 }
2606 #endif
2607
2608 static void diff_resolve_rename_copy(void)
2609 {
2610 int i;
2611 struct diff_filepair *p;
2612 struct diff_queue_struct *q = &diff_queued_diff;
2613
2614 diff_debug_queue("resolve-rename-copy", q);
2615
2616 for (i = 0; i < q->nr; i++) {
2617 p = q->queue[i];
2618 p->status = 0; /* undecided */
2619 if (DIFF_PAIR_UNMERGED(p))
2620 p->status = DIFF_STATUS_UNMERGED;
2621 else if (!DIFF_FILE_VALID(p->one))
2622 p->status = DIFF_STATUS_ADDED;
2623 else if (!DIFF_FILE_VALID(p->two))
2624 p->status = DIFF_STATUS_DELETED;
2625 else if (DIFF_PAIR_TYPE_CHANGED(p))
2626 p->status = DIFF_STATUS_TYPE_CHANGED;
2627
2628 /* from this point on, we are dealing with a pair
2629 * whose both sides are valid and of the same type, i.e.
2630 * either in-place edit or rename/copy edit.
2631 */
2632 else if (DIFF_PAIR_RENAME(p)) {
2633 /*
2634 * A rename might have re-connected a broken
2635 * pair up, causing the pathnames to be the
2636 * same again. If so, that's not a rename at
2637 * all, just a modification..
2638 *
2639 * Otherwise, see if this source was used for
2640 * multiple renames, in which case we decrement
2641 * the count, and call it a copy.
2642 */
2643 if (!strcmp(p->one->path, p->two->path))
2644 p->status = DIFF_STATUS_MODIFIED;
2645 else if (--p->one->rename_used > 0)
2646 p->status = DIFF_STATUS_COPIED;
2647 else
2648 p->status = DIFF_STATUS_RENAMED;
2649 }
2650 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2651 p->one->mode != p->two->mode ||
2652 is_null_sha1(p->one->sha1))
2653 p->status = DIFF_STATUS_MODIFIED;
2654 else {
2655 /* This is a "no-change" entry and should not
2656 * happen anymore, but prepare for broken callers.
2657 */
2658 error("feeding unmodified %s to diffcore",
2659 p->one->path);
2660 p->status = DIFF_STATUS_UNKNOWN;
2661 }
2662 }
2663 diff_debug_queue("resolve-rename-copy done", q);
2664 }
2665
2666 static int check_pair_status(struct diff_filepair *p)
2667 {
2668 switch (p->status) {
2669 case DIFF_STATUS_UNKNOWN:
2670 return 0;
2671 case 0:
2672 die("internal error in diff-resolve-rename-copy");
2673 default:
2674 return 1;
2675 }
2676 }
2677
2678 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2679 {
2680 int fmt = opt->output_format;
2681
2682 if (fmt & DIFF_FORMAT_CHECKDIFF)
2683 diff_flush_checkdiff(p, opt);
2684 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2685 diff_flush_raw(p, opt);
2686 else if (fmt & DIFF_FORMAT_NAME)
2687 write_name_quoted(p->two->path, stdout, opt->line_termination);
2688 }
2689
2690 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2691 {
2692 if (fs->mode)
2693 printf(" %s mode %06o ", newdelete, fs->mode);
2694 else
2695 printf(" %s ", newdelete);
2696 write_name_quoted(fs->path, stdout, '\n');
2697 }
2698
2699
2700 static void show_mode_change(struct diff_filepair *p, int show_name)
2701 {
2702 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2703 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2704 show_name ? ' ' : '\n');
2705 if (show_name) {
2706 write_name_quoted(p->two->path, stdout, '\n');
2707 }
2708 }
2709 }
2710
2711 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2712 {
2713 char *names = pprint_rename(p->one->path, p->two->path);
2714
2715 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2716 free(names);
2717 show_mode_change(p, 0);
2718 }
2719
2720 static void diff_summary(struct diff_filepair *p)
2721 {
2722 switch(p->status) {
2723 case DIFF_STATUS_DELETED:
2724 show_file_mode_name("delete", p->one);
2725 break;
2726 case DIFF_STATUS_ADDED:
2727 show_file_mode_name("create", p->two);
2728 break;
2729 case DIFF_STATUS_COPIED:
2730 show_rename_copy("copy", p);
2731 break;
2732 case DIFF_STATUS_RENAMED:
2733 show_rename_copy("rename", p);
2734 break;
2735 default:
2736 if (p->score) {
2737 fputs(" rewrite ", stdout);
2738 write_name_quoted(p->two->path, stdout, ' ');
2739 printf("(%d%%)\n", similarity_index(p));
2740 }
2741 show_mode_change(p, !p->score);
2742 break;
2743 }
2744 }
2745
2746 struct patch_id_t {
2747 struct xdiff_emit_state xm;
2748 SHA_CTX *ctx;
2749 int patchlen;
2750 };
2751
2752 static int remove_space(char *line, int len)
2753 {
2754 int i;
2755 char *dst = line;
2756 unsigned char c;
2757
2758 for (i = 0; i < len; i++)
2759 if (!isspace((c = line[i])))
2760 *dst++ = c;
2761
2762 return dst - line;
2763 }
2764
2765 static void patch_id_consume(void *priv, char *line, unsigned long len)
2766 {
2767 struct patch_id_t *data = priv;
2768 int new_len;
2769
2770 /* Ignore line numbers when computing the SHA1 of the patch */
2771 if (!prefixcmp(line, "@@ -"))
2772 return;
2773
2774 new_len = remove_space(line, len);
2775
2776 SHA1_Update(data->ctx, line, new_len);
2777 data->patchlen += new_len;
2778 }
2779
2780 /* returns 0 upon success, and writes result into sha1 */
2781 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2782 {
2783 struct diff_queue_struct *q = &diff_queued_diff;
2784 int i;
2785 SHA_CTX ctx;
2786 struct patch_id_t data;
2787 char buffer[PATH_MAX * 4 + 20];
2788
2789 SHA1_Init(&ctx);
2790 memset(&data, 0, sizeof(struct patch_id_t));
2791 data.ctx = &ctx;
2792 data.xm.consume = patch_id_consume;
2793
2794 for (i = 0; i < q->nr; i++) {
2795 xpparam_t xpp;
2796 xdemitconf_t xecfg;
2797 xdemitcb_t ecb;
2798 mmfile_t mf1, mf2;
2799 struct diff_filepair *p = q->queue[i];
2800 int len1, len2;
2801
2802 memset(&xecfg, 0, sizeof(xecfg));
2803 if (p->status == 0)
2804 return error("internal diff status error");
2805 if (p->status == DIFF_STATUS_UNKNOWN)
2806 continue;
2807 if (diff_unmodified_pair(p))
2808 continue;
2809 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2810 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2811 continue;
2812 if (DIFF_PAIR_UNMERGED(p))
2813 continue;
2814
2815 diff_fill_sha1_info(p->one);
2816 diff_fill_sha1_info(p->two);
2817 if (fill_mmfile(&mf1, p->one) < 0 ||
2818 fill_mmfile(&mf2, p->two) < 0)
2819 return error("unable to read files to diff");
2820
2821 len1 = remove_space(p->one->path, strlen(p->one->path));
2822 len2 = remove_space(p->two->path, strlen(p->two->path));
2823 if (p->one->mode == 0)
2824 len1 = snprintf(buffer, sizeof(buffer),
2825 "diff--gita/%.*sb/%.*s"
2826 "newfilemode%06o"
2827 "---/dev/null"
2828 "+++b/%.*s",
2829 len1, p->one->path,
2830 len2, p->two->path,
2831 p->two->mode,
2832 len2, p->two->path);
2833 else if (p->two->mode == 0)
2834 len1 = snprintf(buffer, sizeof(buffer),
2835 "diff--gita/%.*sb/%.*s"
2836 "deletedfilemode%06o"
2837 "---a/%.*s"
2838 "+++/dev/null",
2839 len1, p->one->path,
2840 len2, p->two->path,
2841 p->one->mode,
2842 len1, p->one->path);
2843 else
2844 len1 = snprintf(buffer, sizeof(buffer),
2845 "diff--gita/%.*sb/%.*s"
2846 "---a/%.*s"
2847 "+++b/%.*s",
2848 len1, p->one->path,
2849 len2, p->two->path,
2850 len1, p->one->path,
2851 len2, p->two->path);
2852 SHA1_Update(&ctx, buffer, len1);
2853
2854 xpp.flags = XDF_NEED_MINIMAL;
2855 xecfg.ctxlen = 3;
2856 xecfg.flags = XDL_EMIT_FUNCNAMES;
2857 ecb.outf = xdiff_outf;
2858 ecb.priv = &data;
2859 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2860 }
2861
2862 SHA1_Final(sha1, &ctx);
2863 return 0;
2864 }
2865
2866 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2867 {
2868 struct diff_queue_struct *q = &diff_queued_diff;
2869 int i;
2870 int result = diff_get_patch_id(options, sha1);
2871
2872 for (i = 0; i < q->nr; i++)
2873 diff_free_filepair(q->queue[i]);
2874
2875 free(q->queue);
2876 q->queue = NULL;
2877 q->nr = q->alloc = 0;
2878
2879 return result;
2880 }
2881
2882 static int is_summary_empty(const struct diff_queue_struct *q)
2883 {
2884 int i;
2885
2886 for (i = 0; i < q->nr; i++) {
2887 const struct diff_filepair *p = q->queue[i];
2888
2889 switch (p->status) {
2890 case DIFF_STATUS_DELETED:
2891 case DIFF_STATUS_ADDED:
2892 case DIFF_STATUS_COPIED:
2893 case DIFF_STATUS_RENAMED:
2894 return 0;
2895 default:
2896 if (p->score)
2897 return 0;
2898 if (p->one->mode && p->two->mode &&
2899 p->one->mode != p->two->mode)
2900 return 0;
2901 break;
2902 }
2903 }
2904 return 1;
2905 }
2906
2907 void diff_flush(struct diff_options *options)
2908 {
2909 struct diff_queue_struct *q = &diff_queued_diff;
2910 int i, output_format = options->output_format;
2911 int separator = 0;
2912
2913 /*
2914 * Order: raw, stat, summary, patch
2915 * or: name/name-status/checkdiff (other bits clear)
2916 */
2917 if (!q->nr)
2918 goto free_queue;
2919
2920 if (output_format & (DIFF_FORMAT_RAW |
2921 DIFF_FORMAT_NAME |
2922 DIFF_FORMAT_NAME_STATUS |
2923 DIFF_FORMAT_CHECKDIFF)) {
2924 for (i = 0; i < q->nr; i++) {
2925 struct diff_filepair *p = q->queue[i];
2926 if (check_pair_status(p))
2927 flush_one_pair(p, options);
2928 }
2929 separator++;
2930 }
2931
2932 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2933 struct diffstat_t diffstat;
2934
2935 memset(&diffstat, 0, sizeof(struct diffstat_t));
2936 diffstat.xm.consume = diffstat_consume;
2937 for (i = 0; i < q->nr; i++) {
2938 struct diff_filepair *p = q->queue[i];
2939 if (check_pair_status(p))
2940 diff_flush_stat(p, options, &diffstat);
2941 }
2942 if (output_format & DIFF_FORMAT_NUMSTAT)
2943 show_numstat(&diffstat, options);
2944 if (output_format & DIFF_FORMAT_DIFFSTAT)
2945 show_stats(&diffstat, options);
2946 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2947 show_shortstats(&diffstat);
2948 separator++;
2949 }
2950
2951 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2952 for (i = 0; i < q->nr; i++)
2953 diff_summary(q->queue[i]);
2954 separator++;
2955 }
2956
2957 if (output_format & DIFF_FORMAT_PATCH) {
2958 if (separator) {
2959 if (options->stat_sep) {
2960 /* attach patch instead of inline */
2961 fputs(options->stat_sep, stdout);
2962 } else {
2963 putchar(options->line_termination);
2964 }
2965 }
2966
2967 for (i = 0; i < q->nr; i++) {
2968 struct diff_filepair *p = q->queue[i];
2969 if (check_pair_status(p))
2970 diff_flush_patch(p, options);
2971 }
2972 }
2973
2974 if (output_format & DIFF_FORMAT_CALLBACK)
2975 options->format_callback(q, options, options->format_callback_data);
2976
2977 for (i = 0; i < q->nr; i++)
2978 diff_free_filepair(q->queue[i]);
2979 free_queue:
2980 free(q->queue);
2981 q->queue = NULL;
2982 q->nr = q->alloc = 0;
2983 }
2984
2985 static void diffcore_apply_filter(const char *filter)
2986 {
2987 int i;
2988 struct diff_queue_struct *q = &diff_queued_diff;
2989 struct diff_queue_struct outq;
2990 outq.queue = NULL;
2991 outq.nr = outq.alloc = 0;
2992
2993 if (!filter)
2994 return;
2995
2996 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2997 int found;
2998 for (i = found = 0; !found && i < q->nr; i++) {
2999 struct diff_filepair *p = q->queue[i];
3000 if (((p->status == DIFF_STATUS_MODIFIED) &&
3001 ((p->score &&
3002 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3003 (!p->score &&
3004 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3005 ((p->status != DIFF_STATUS_MODIFIED) &&
3006 strchr(filter, p->status)))
3007 found++;
3008 }
3009 if (found)
3010 return;
3011
3012 /* otherwise we will clear the whole queue
3013 * by copying the empty outq at the end of this
3014 * function, but first clear the current entries
3015 * in the queue.
3016 */
3017 for (i = 0; i < q->nr; i++)
3018 diff_free_filepair(q->queue[i]);
3019 }
3020 else {
3021 /* Only the matching ones */
3022 for (i = 0; i < q->nr; i++) {
3023 struct diff_filepair *p = q->queue[i];
3024
3025 if (((p->status == DIFF_STATUS_MODIFIED) &&
3026 ((p->score &&
3027 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3028 (!p->score &&
3029 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3030 ((p->status != DIFF_STATUS_MODIFIED) &&
3031 strchr(filter, p->status)))
3032 diff_q(&outq, p);
3033 else
3034 diff_free_filepair(p);
3035 }
3036 }
3037 free(q->queue);
3038 *q = outq;
3039 }
3040
3041 /* Check whether two filespecs with the same mode and size are identical */
3042 static int diff_filespec_is_identical(struct diff_filespec *one,
3043 struct diff_filespec *two)
3044 {
3045 if (S_ISGITLINK(one->mode)) {
3046 diff_fill_sha1_info(one);
3047 diff_fill_sha1_info(two);
3048 return !hashcmp(one->sha1, two->sha1);
3049 }
3050 if (diff_populate_filespec(one, 0))
3051 return 0;
3052 if (diff_populate_filespec(two, 0))
3053 return 0;
3054 return !memcmp(one->data, two->data, one->size);
3055 }
3056
3057 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3058 {
3059 int i;
3060 struct diff_queue_struct *q = &diff_queued_diff;
3061 struct diff_queue_struct outq;
3062 outq.queue = NULL;
3063 outq.nr = outq.alloc = 0;
3064
3065 for (i = 0; i < q->nr; i++) {
3066 struct diff_filepair *p = q->queue[i];
3067
3068 /*
3069 * 1. Entries that come from stat info dirtyness
3070 * always have both sides (iow, not create/delete),
3071 * one side of the object name is unknown, with
3072 * the same mode and size. Keep the ones that
3073 * do not match these criteria. They have real
3074 * differences.
3075 *
3076 * 2. At this point, the file is known to be modified,
3077 * with the same mode and size, and the object
3078 * name of one side is unknown. Need to inspect
3079 * the identical contents.
3080 */
3081 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3082 !DIFF_FILE_VALID(p->two) ||
3083 (p->one->sha1_valid && p->two->sha1_valid) ||
3084 (p->one->mode != p->two->mode) ||
3085 diff_populate_filespec(p->one, 1) ||
3086 diff_populate_filespec(p->two, 1) ||
3087 (p->one->size != p->two->size) ||
3088 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3089 diff_q(&outq, p);
3090 else {
3091 /*
3092 * The caller can subtract 1 from skip_stat_unmatch
3093 * to determine how many paths were dirty only
3094 * due to stat info mismatch.
3095 */
3096 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3097 diffopt->skip_stat_unmatch++;
3098 diff_free_filepair(p);
3099 }
3100 }
3101 free(q->queue);
3102 *q = outq;
3103 }
3104
3105 void diffcore_std(struct diff_options *options)
3106 {
3107 if (DIFF_OPT_TST(options, QUIET))
3108 return;
3109
3110 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3111 diffcore_skip_stat_unmatch(options);
3112 if (options->break_opt != -1)
3113 diffcore_break(options->break_opt);
3114 if (options->detect_rename)
3115 diffcore_rename(options);
3116 if (options->break_opt != -1)
3117 diffcore_merge_broken();
3118 if (options->pickaxe)
3119 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3120 if (options->orderfile)
3121 diffcore_order(options->orderfile);
3122 diff_resolve_rename_copy();
3123 diffcore_apply_filter(options->filter);
3124
3125 if (diff_queued_diff.nr)
3126 DIFF_OPT_SET(options, HAS_CHANGES);
3127 else
3128 DIFF_OPT_CLR(options, HAS_CHANGES);
3129 }
3130
3131
3132 void diff_addremove(struct diff_options *options,
3133 int addremove, unsigned mode,
3134 const unsigned char *sha1,
3135 const char *base, const char *path)
3136 {
3137 char concatpath[PATH_MAX];
3138 struct diff_filespec *one, *two;
3139
3140 /* This may look odd, but it is a preparation for
3141 * feeding "there are unchanged files which should
3142 * not produce diffs, but when you are doing copy
3143 * detection you would need them, so here they are"
3144 * entries to the diff-core. They will be prefixed
3145 * with something like '=' or '*' (I haven't decided
3146 * which but should not make any difference).
3147 * Feeding the same new and old to diff_change()
3148 * also has the same effect.
3149 * Before the final output happens, they are pruned after
3150 * merged into rename/copy pairs as appropriate.
3151 */
3152 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3153 addremove = (addremove == '+' ? '-' :
3154 addremove == '-' ? '+' : addremove);
3155
3156 if (!path) path = "";
3157 sprintf(concatpath, "%s%s", base, path);
3158 one = alloc_filespec(concatpath);
3159 two = alloc_filespec(concatpath);
3160
3161 if (addremove != '+')
3162 fill_filespec(one, sha1, mode);
3163 if (addremove != '-')
3164 fill_filespec(two, sha1, mode);
3165
3166 diff_queue(&diff_queued_diff, one, two);
3167 DIFF_OPT_SET(options, HAS_CHANGES);
3168 }
3169
3170 void diff_change(struct diff_options *options,
3171 unsigned old_mode, unsigned new_mode,
3172 const unsigned char *old_sha1,
3173 const unsigned char *new_sha1,
3174 const char *base, const char *path)
3175 {
3176 char concatpath[PATH_MAX];
3177 struct diff_filespec *one, *two;
3178
3179 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3180 unsigned tmp;
3181 const unsigned char *tmp_c;
3182 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3183 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3184 }
3185 if (!path) path = "";
3186 sprintf(concatpath, "%s%s", base, path);
3187 one = alloc_filespec(concatpath);
3188 two = alloc_filespec(concatpath);
3189 fill_filespec(one, old_sha1, old_mode);
3190 fill_filespec(two, new_sha1, new_mode);
3191
3192 diff_queue(&diff_queued_diff, one, two);
3193 DIFF_OPT_SET(options, HAS_CHANGES);
3194 }
3195
3196 void diff_unmerge(struct diff_options *options,
3197 const char *path,
3198 unsigned mode, const unsigned char *sha1)
3199 {
3200 struct diff_filespec *one, *two;
3201 one = alloc_filespec(path);
3202 two = alloc_filespec(path);
3203 fill_filespec(one, sha1, mode);
3204 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3205 }
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