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diff --check: minor fixups
[alt-git.git] / diff.c
blob3e46ff8a75c5840a5f3374aa76e93cfb468c86f1
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 unsigned status;
1035 };
1036
1037 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1038 {
1039 struct checkdiff_t *data = priv;
1040 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1041 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1042 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
1043
1044 if (line[0] == '+') {
1045 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
1046
1047 /* check space before tab */
1048 for (i = 1; i < len; i++) {
1049 if (line[i] == ' ')
1050 spaces++;
1051 else if (line[i] == '\t') {
1052 if (spaces) {
1053 space_before_tab = 1;
1054 break;
1055 }
1056 }
1057 else
1058 break;
1059 }
1060
1061 /* check whitespace at line end */
1062 if (line[len - 1] == '\n')
1063 len--;
1064 if (isspace(line[len - 1]))
1065 white_space_at_end = 1;
1066
1067 if (space_before_tab || white_space_at_end) {
1068 data->status = 1;
1069 printf("%s:%d: %s", data->filename, data->lineno, ws);
1070 if (space_before_tab) {
1071 printf("space before tab");
1072 if (white_space_at_end)
1073 putchar(',');
1074 }
1075 if (white_space_at_end)
1076 printf("whitespace at end");
1077 printf(":%s ", reset);
1078 emit_line_with_ws(1, set, reset, ws, line, len,
1079 data->ws_rule);
1080 }
1081
1082 data->lineno++;
1083 } else if (line[0] == ' ')
1084 data->lineno++;
1085 else if (line[0] == '@') {
1086 char *plus = strchr(line, '+');
1087 if (plus)
1088 data->lineno = strtol(plus, NULL, 10);
1089 else
1090 die("invalid diff");
1091 }
1092 }
1093
1094 static unsigned char *deflate_it(char *data,
1095 unsigned long size,
1096 unsigned long *result_size)
1097 {
1098 int bound;
1099 unsigned char *deflated;
1100 z_stream stream;
1101
1102 memset(&stream, 0, sizeof(stream));
1103 deflateInit(&stream, zlib_compression_level);
1104 bound = deflateBound(&stream, size);
1105 deflated = xmalloc(bound);
1106 stream.next_out = deflated;
1107 stream.avail_out = bound;
1108
1109 stream.next_in = (unsigned char *)data;
1110 stream.avail_in = size;
1111 while (deflate(&stream, Z_FINISH) == Z_OK)
1112 ; /* nothing */
1113 deflateEnd(&stream);
1114 *result_size = stream.total_out;
1115 return deflated;
1116 }
1117
1118 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1119 {
1120 void *cp;
1121 void *delta;
1122 void *deflated;
1123 void *data;
1124 unsigned long orig_size;
1125 unsigned long delta_size;
1126 unsigned long deflate_size;
1127 unsigned long data_size;
1128
1129 /* We could do deflated delta, or we could do just deflated two,
1130 * whichever is smaller.
1131 */
1132 delta = NULL;
1133 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1134 if (one->size && two->size) {
1135 delta = diff_delta(one->ptr, one->size,
1136 two->ptr, two->size,
1137 &delta_size, deflate_size);
1138 if (delta) {
1139 void *to_free = delta;
1140 orig_size = delta_size;
1141 delta = deflate_it(delta, delta_size, &delta_size);
1142 free(to_free);
1143 }
1144 }
1145
1146 if (delta && delta_size < deflate_size) {
1147 printf("delta %lu\n", orig_size);
1148 free(deflated);
1149 data = delta;
1150 data_size = delta_size;
1151 }
1152 else {
1153 printf("literal %lu\n", two->size);
1154 free(delta);
1155 data = deflated;
1156 data_size = deflate_size;
1157 }
1158
1159 /* emit data encoded in base85 */
1160 cp = data;
1161 while (data_size) {
1162 int bytes = (52 < data_size) ? 52 : data_size;
1163 char line[70];
1164 data_size -= bytes;
1165 if (bytes <= 26)
1166 line[0] = bytes + 'A' - 1;
1167 else
1168 line[0] = bytes - 26 + 'a' - 1;
1169 encode_85(line + 1, cp, bytes);
1170 cp = (char *) cp + bytes;
1171 puts(line);
1172 }
1173 printf("\n");
1174 free(data);
1175 }
1176
1177 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1178 {
1179 printf("GIT binary patch\n");
1180 emit_binary_diff_body(one, two);
1181 emit_binary_diff_body(two, one);
1182 }
1183
1184 static void setup_diff_attr_check(struct git_attr_check *check)
1185 {
1186 static struct git_attr *attr_diff;
1187
1188 if (!attr_diff) {
1189 attr_diff = git_attr("diff", 4);
1190 }
1191 check[0].attr = attr_diff;
1192 }
1193
1194 static void diff_filespec_check_attr(struct diff_filespec *one)
1195 {
1196 struct git_attr_check attr_diff_check;
1197 int check_from_data = 0;
1198
1199 if (one->checked_attr)
1200 return;
1201
1202 setup_diff_attr_check(&attr_diff_check);
1203 one->is_binary = 0;
1204 one->funcname_pattern_ident = NULL;
1205
1206 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1207 const char *value;
1208
1209 /* binaryness */
1210 value = attr_diff_check.value;
1211 if (ATTR_TRUE(value))
1212 ;
1213 else if (ATTR_FALSE(value))
1214 one->is_binary = 1;
1215 else
1216 check_from_data = 1;
1217
1218 /* funcname pattern ident */
1219 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1220 ;
1221 else
1222 one->funcname_pattern_ident = value;
1223 }
1224
1225 if (check_from_data) {
1226 if (!one->data && DIFF_FILE_VALID(one))
1227 diff_populate_filespec(one, 0);
1228
1229 if (one->data)
1230 one->is_binary = buffer_is_binary(one->data, one->size);
1231 }
1232 }
1233
1234 int diff_filespec_is_binary(struct diff_filespec *one)
1235 {
1236 diff_filespec_check_attr(one);
1237 return one->is_binary;
1238 }
1239
1240 static const char *funcname_pattern(const char *ident)
1241 {
1242 struct funcname_pattern *pp;
1243
1244 read_config_if_needed();
1245 for (pp = funcname_pattern_list; pp; pp = pp->next)
1246 if (!strcmp(ident, pp->name))
1247 return pp->pattern;
1248 return NULL;
1249 }
1250
1251 static struct builtin_funcname_pattern {
1252 const char *name;
1253 const char *pattern;
1254 } builtin_funcname_pattern[] = {
1255 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1256 "new\\|return\\|switch\\|throw\\|while\\)\n"
1257 "^[ ]*\\(\\([ ]*"
1258 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1259 "[ ]*([^;]*$\\)" },
1260 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1261 };
1262
1263 static const char *diff_funcname_pattern(struct diff_filespec *one)
1264 {
1265 const char *ident, *pattern;
1266 int i;
1267
1268 diff_filespec_check_attr(one);
1269 ident = one->funcname_pattern_ident;
1270
1271 if (!ident)
1272 /*
1273 * If the config file has "funcname.default" defined, that
1274 * regexp is used; otherwise NULL is returned and xemit uses
1275 * the built-in default.
1276 */
1277 return funcname_pattern("default");
1278
1279 /* Look up custom "funcname.$ident" regexp from config. */
1280 pattern = funcname_pattern(ident);
1281 if (pattern)
1282 return pattern;
1283
1284 /*
1285 * And define built-in fallback patterns here. Note that
1286 * these can be overriden by the user's config settings.
1287 */
1288 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1289 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1290 return builtin_funcname_pattern[i].pattern;
1291
1292 return NULL;
1293 }
1294
1295 static void builtin_diff(const char *name_a,
1296 const char *name_b,
1297 struct diff_filespec *one,
1298 struct diff_filespec *two,
1299 const char *xfrm_msg,
1300 struct diff_options *o,
1301 int complete_rewrite)
1302 {
1303 mmfile_t mf1, mf2;
1304 const char *lbl[2];
1305 char *a_one, *b_two;
1306 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1307 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1308
1309 a_one = quote_two("a/", name_a + (*name_a == '/'));
1310 b_two = quote_two("b/", name_b + (*name_b == '/'));
1311 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1312 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1313 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1314 if (lbl[0][0] == '/') {
1315 /* /dev/null */
1316 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1317 if (xfrm_msg && xfrm_msg[0])
1318 printf("%s%s%s\n", set, xfrm_msg, reset);
1319 }
1320 else if (lbl[1][0] == '/') {
1321 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1322 if (xfrm_msg && xfrm_msg[0])
1323 printf("%s%s%s\n", set, xfrm_msg, reset);
1324 }
1325 else {
1326 if (one->mode != two->mode) {
1327 printf("%sold mode %06o%s\n", set, one->mode, reset);
1328 printf("%snew mode %06o%s\n", set, two->mode, reset);
1329 }
1330 if (xfrm_msg && xfrm_msg[0])
1331 printf("%s%s%s\n", set, xfrm_msg, reset);
1332 /*
1333 * we do not run diff between different kind
1334 * of objects.
1335 */
1336 if ((one->mode ^ two->mode) & S_IFMT)
1337 goto free_ab_and_return;
1338 if (complete_rewrite) {
1339 emit_rewrite_diff(name_a, name_b, one, two,
1340 DIFF_OPT_TST(o, COLOR_DIFF));
1341 o->found_changes = 1;
1342 goto free_ab_and_return;
1343 }
1344 }
1345
1346 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1347 die("unable to read files to diff");
1348
1349 if (!DIFF_OPT_TST(o, TEXT) &&
1350 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1351 /* Quite common confusing case */
1352 if (mf1.size == mf2.size &&
1353 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1354 goto free_ab_and_return;
1355 if (DIFF_OPT_TST(o, BINARY))
1356 emit_binary_diff(&mf1, &mf2);
1357 else
1358 printf("Binary files %s and %s differ\n",
1359 lbl[0], lbl[1]);
1360 o->found_changes = 1;
1361 }
1362 else {
1363 /* Crazy xdl interfaces.. */
1364 const char *diffopts = getenv("GIT_DIFF_OPTS");
1365 xpparam_t xpp;
1366 xdemitconf_t xecfg;
1367 xdemitcb_t ecb;
1368 struct emit_callback ecbdata;
1369 const char *funcname_pattern;
1370
1371 funcname_pattern = diff_funcname_pattern(one);
1372 if (!funcname_pattern)
1373 funcname_pattern = diff_funcname_pattern(two);
1374
1375 memset(&xecfg, 0, sizeof(xecfg));
1376 memset(&ecbdata, 0, sizeof(ecbdata));
1377 ecbdata.label_path = lbl;
1378 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1379 ecbdata.found_changesp = &o->found_changes;
1380 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1381 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1382 xecfg.ctxlen = o->context;
1383 xecfg.flags = XDL_EMIT_FUNCNAMES;
1384 if (funcname_pattern)
1385 xdiff_set_find_func(&xecfg, funcname_pattern);
1386 if (!diffopts)
1387 ;
1388 else if (!prefixcmp(diffopts, "--unified="))
1389 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1390 else if (!prefixcmp(diffopts, "-u"))
1391 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1392 ecb.outf = xdiff_outf;
1393 ecb.priv = &ecbdata;
1394 ecbdata.xm.consume = fn_out_consume;
1395 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1396 ecbdata.diff_words =
1397 xcalloc(1, sizeof(struct diff_words_data));
1398 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1399 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1400 free_diff_words_data(&ecbdata);
1401 }
1402
1403 free_ab_and_return:
1404 diff_free_filespec_data(one);
1405 diff_free_filespec_data(two);
1406 free(a_one);
1407 free(b_two);
1408 return;
1409 }
1410
1411 static void builtin_diffstat(const char *name_a, const char *name_b,
1412 struct diff_filespec *one,
1413 struct diff_filespec *two,
1414 struct diffstat_t *diffstat,
1415 struct diff_options *o,
1416 int complete_rewrite)
1417 {
1418 mmfile_t mf1, mf2;
1419 struct diffstat_file *data;
1420
1421 data = diffstat_add(diffstat, name_a, name_b);
1422
1423 if (!one || !two) {
1424 data->is_unmerged = 1;
1425 return;
1426 }
1427 if (complete_rewrite) {
1428 diff_populate_filespec(one, 0);
1429 diff_populate_filespec(two, 0);
1430 data->deleted = count_lines(one->data, one->size);
1431 data->added = count_lines(two->data, two->size);
1432 goto free_and_return;
1433 }
1434 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1435 die("unable to read files to diff");
1436
1437 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1438 data->is_binary = 1;
1439 data->added = mf2.size;
1440 data->deleted = mf1.size;
1441 } else {
1442 /* Crazy xdl interfaces.. */
1443 xpparam_t xpp;
1444 xdemitconf_t xecfg;
1445 xdemitcb_t ecb;
1446
1447 memset(&xecfg, 0, sizeof(xecfg));
1448 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1449 ecb.outf = xdiff_outf;
1450 ecb.priv = diffstat;
1451 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1452 }
1453
1454 free_and_return:
1455 diff_free_filespec_data(one);
1456 diff_free_filespec_data(two);
1457 }
1458
1459 static void builtin_checkdiff(const char *name_a, const char *name_b,
1460 struct diff_filespec *one,
1461 struct diff_filespec *two, struct diff_options *o)
1462 {
1463 mmfile_t mf1, mf2;
1464 struct checkdiff_t data;
1465
1466 if (!two)
1467 return;
1468
1469 memset(&data, 0, sizeof(data));
1470 data.xm.consume = checkdiff_consume;
1471 data.filename = name_b ? name_b : name_a;
1472 data.lineno = 0;
1473 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1474 data.ws_rule = whitespace_rule(data.filename);
1475
1476 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1477 die("unable to read files to diff");
1478
1479 if (diff_filespec_is_binary(two))
1480 goto free_and_return;
1481 else {
1482 /* Crazy xdl interfaces.. */
1483 xpparam_t xpp;
1484 xdemitconf_t xecfg;
1485 xdemitcb_t ecb;
1486
1487 memset(&xecfg, 0, sizeof(xecfg));
1488 xpp.flags = XDF_NEED_MINIMAL;
1489 ecb.outf = xdiff_outf;
1490 ecb.priv = &data;
1491 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1492 }
1493 free_and_return:
1494 diff_free_filespec_data(one);
1495 diff_free_filespec_data(two);
1496 if (data.status)
1497 DIFF_OPT_SET(o, CHECK_FAILED);
1498 }
1499
1500 struct diff_filespec *alloc_filespec(const char *path)
1501 {
1502 int namelen = strlen(path);
1503 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1504
1505 memset(spec, 0, sizeof(*spec));
1506 spec->path = (char *)(spec + 1);
1507 memcpy(spec->path, path, namelen+1);
1508 spec->count = 1;
1509 return spec;
1510 }
1511
1512 void free_filespec(struct diff_filespec *spec)
1513 {
1514 if (!--spec->count) {
1515 diff_free_filespec_data(spec);
1516 free(spec);
1517 }
1518 }
1519
1520 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1521 unsigned short mode)
1522 {
1523 if (mode) {
1524 spec->mode = canon_mode(mode);
1525 hashcpy(spec->sha1, sha1);
1526 spec->sha1_valid = !is_null_sha1(sha1);
1527 }
1528 }
1529
1530 /*
1531 * Given a name and sha1 pair, if the index tells us the file in
1532 * the work tree has that object contents, return true, so that
1533 * prepare_temp_file() does not have to inflate and extract.
1534 */
1535 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1536 {
1537 struct cache_entry *ce;
1538 struct stat st;
1539 int pos, len;
1540
1541 /* We do not read the cache ourselves here, because the
1542 * benchmark with my previous version that always reads cache
1543 * shows that it makes things worse for diff-tree comparing
1544 * two linux-2.6 kernel trees in an already checked out work
1545 * tree. This is because most diff-tree comparisons deal with
1546 * only a small number of files, while reading the cache is
1547 * expensive for a large project, and its cost outweighs the
1548 * savings we get by not inflating the object to a temporary
1549 * file. Practically, this code only helps when we are used
1550 * by diff-cache --cached, which does read the cache before
1551 * calling us.
1552 */
1553 if (!active_cache)
1554 return 0;
1555
1556 /* We want to avoid the working directory if our caller
1557 * doesn't need the data in a normal file, this system
1558 * is rather slow with its stat/open/mmap/close syscalls,
1559 * and the object is contained in a pack file. The pack
1560 * is probably already open and will be faster to obtain
1561 * the data through than the working directory. Loose
1562 * objects however would tend to be slower as they need
1563 * to be individually opened and inflated.
1564 */
1565 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1566 return 0;
1567
1568 len = strlen(name);
1569 pos = cache_name_pos(name, len);
1570 if (pos < 0)
1571 return 0;
1572 ce = active_cache[pos];
1573 if ((lstat(name, &st) < 0) ||
1574 !S_ISREG(st.st_mode) || /* careful! */
1575 ce_match_stat(ce, &st, 0) ||
1576 hashcmp(sha1, ce->sha1))
1577 return 0;
1578 /* we return 1 only when we can stat, it is a regular file,
1579 * stat information matches, and sha1 recorded in the cache
1580 * matches. I.e. we know the file in the work tree really is
1581 * the same as the <name, sha1> pair.
1582 */
1583 return 1;
1584 }
1585
1586 static int populate_from_stdin(struct diff_filespec *s)
1587 {
1588 struct strbuf buf;
1589 size_t size = 0;
1590
1591 strbuf_init(&buf, 0);
1592 if (strbuf_read(&buf, 0, 0) < 0)
1593 return error("error while reading from stdin %s",
1594 strerror(errno));
1595
1596 s->should_munmap = 0;
1597 s->data = strbuf_detach(&buf, &size);
1598 s->size = size;
1599 s->should_free = 1;
1600 return 0;
1601 }
1602
1603 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1604 {
1605 int len;
1606 char *data = xmalloc(100);
1607 len = snprintf(data, 100,
1608 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1609 s->data = data;
1610 s->size = len;
1611 s->should_free = 1;
1612 if (size_only) {
1613 s->data = NULL;
1614 free(data);
1615 }
1616 return 0;
1617 }
1618
1619 /*
1620 * While doing rename detection and pickaxe operation, we may need to
1621 * grab the data for the blob (or file) for our own in-core comparison.
1622 * diff_filespec has data and size fields for this purpose.
1623 */
1624 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1625 {
1626 int err = 0;
1627 if (!DIFF_FILE_VALID(s))
1628 die("internal error: asking to populate invalid file.");
1629 if (S_ISDIR(s->mode))
1630 return -1;
1631
1632 if (s->data)
1633 return 0;
1634
1635 if (size_only && 0 < s->size)
1636 return 0;
1637
1638 if (S_ISGITLINK(s->mode))
1639 return diff_populate_gitlink(s, size_only);
1640
1641 if (!s->sha1_valid ||
1642 reuse_worktree_file(s->path, s->sha1, 0)) {
1643 struct strbuf buf;
1644 struct stat st;
1645 int fd;
1646
1647 if (!strcmp(s->path, "-"))
1648 return populate_from_stdin(s);
1649
1650 if (lstat(s->path, &st) < 0) {
1651 if (errno == ENOENT) {
1652 err_empty:
1653 err = -1;
1654 empty:
1655 s->data = (char *)"";
1656 s->size = 0;
1657 return err;
1658 }
1659 }
1660 s->size = xsize_t(st.st_size);
1661 if (!s->size)
1662 goto empty;
1663 if (size_only)
1664 return 0;
1665 if (S_ISLNK(st.st_mode)) {
1666 int ret;
1667 s->data = xmalloc(s->size);
1668 s->should_free = 1;
1669 ret = readlink(s->path, s->data, s->size);
1670 if (ret < 0) {
1671 free(s->data);
1672 goto err_empty;
1673 }
1674 return 0;
1675 }
1676 fd = open(s->path, O_RDONLY);
1677 if (fd < 0)
1678 goto err_empty;
1679 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1680 close(fd);
1681 s->should_munmap = 1;
1682
1683 /*
1684 * Convert from working tree format to canonical git format
1685 */
1686 strbuf_init(&buf, 0);
1687 if (convert_to_git(s->path, s->data, s->size, &buf)) {
1688 size_t size = 0;
1689 munmap(s->data, s->size);
1690 s->should_munmap = 0;
1691 s->data = strbuf_detach(&buf, &size);
1692 s->size = size;
1693 s->should_free = 1;
1694 }
1695 }
1696 else {
1697 enum object_type type;
1698 if (size_only)
1699 type = sha1_object_info(s->sha1, &s->size);
1700 else {
1701 s->data = read_sha1_file(s->sha1, &type, &s->size);
1702 s->should_free = 1;
1703 }
1704 }
1705 return 0;
1706 }
1707
1708 void diff_free_filespec_blob(struct diff_filespec *s)
1709 {
1710 if (s->should_free)
1711 free(s->data);
1712 else if (s->should_munmap)
1713 munmap(s->data, s->size);
1714
1715 if (s->should_free || s->should_munmap) {
1716 s->should_free = s->should_munmap = 0;
1717 s->data = NULL;
1718 }
1719 }
1720
1721 void diff_free_filespec_data(struct diff_filespec *s)
1722 {
1723 diff_free_filespec_blob(s);
1724 free(s->cnt_data);
1725 s->cnt_data = NULL;
1726 }
1727
1728 static void prep_temp_blob(struct diff_tempfile *temp,
1729 void *blob,
1730 unsigned long size,
1731 const unsigned char *sha1,
1732 int mode)
1733 {
1734 int fd;
1735
1736 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1737 if (fd < 0)
1738 die("unable to create temp-file: %s", strerror(errno));
1739 if (write_in_full(fd, blob, size) != size)
1740 die("unable to write temp-file");
1741 close(fd);
1742 temp->name = temp->tmp_path;
1743 strcpy(temp->hex, sha1_to_hex(sha1));
1744 temp->hex[40] = 0;
1745 sprintf(temp->mode, "%06o", mode);
1746 }
1747
1748 static void prepare_temp_file(const char *name,
1749 struct diff_tempfile *temp,
1750 struct diff_filespec *one)
1751 {
1752 if (!DIFF_FILE_VALID(one)) {
1753 not_a_valid_file:
1754 /* A '-' entry produces this for file-2, and
1755 * a '+' entry produces this for file-1.
1756 */
1757 temp->name = "/dev/null";
1758 strcpy(temp->hex, ".");
1759 strcpy(temp->mode, ".");
1760 return;
1761 }
1762
1763 if (!one->sha1_valid ||
1764 reuse_worktree_file(name, one->sha1, 1)) {
1765 struct stat st;
1766 if (lstat(name, &st) < 0) {
1767 if (errno == ENOENT)
1768 goto not_a_valid_file;
1769 die("stat(%s): %s", name, strerror(errno));
1770 }
1771 if (S_ISLNK(st.st_mode)) {
1772 int ret;
1773 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1774 size_t sz = xsize_t(st.st_size);
1775 if (sizeof(buf) <= st.st_size)
1776 die("symlink too long: %s", name);
1777 ret = readlink(name, buf, sz);
1778 if (ret < 0)
1779 die("readlink(%s)", name);
1780 prep_temp_blob(temp, buf, sz,
1781 (one->sha1_valid ?
1782 one->sha1 : null_sha1),
1783 (one->sha1_valid ?
1784 one->mode : S_IFLNK));
1785 }
1786 else {
1787 /* we can borrow from the file in the work tree */
1788 temp->name = name;
1789 if (!one->sha1_valid)
1790 strcpy(temp->hex, sha1_to_hex(null_sha1));
1791 else
1792 strcpy(temp->hex, sha1_to_hex(one->sha1));
1793 /* Even though we may sometimes borrow the
1794 * contents from the work tree, we always want
1795 * one->mode. mode is trustworthy even when
1796 * !(one->sha1_valid), as long as
1797 * DIFF_FILE_VALID(one).
1798 */
1799 sprintf(temp->mode, "%06o", one->mode);
1800 }
1801 return;
1802 }
1803 else {
1804 if (diff_populate_filespec(one, 0))
1805 die("cannot read data blob for %s", one->path);
1806 prep_temp_blob(temp, one->data, one->size,
1807 one->sha1, one->mode);
1808 }
1809 }
1810
1811 static void remove_tempfile(void)
1812 {
1813 int i;
1814
1815 for (i = 0; i < 2; i++)
1816 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1817 unlink(diff_temp[i].name);
1818 diff_temp[i].name = NULL;
1819 }
1820 }
1821
1822 static void remove_tempfile_on_signal(int signo)
1823 {
1824 remove_tempfile();
1825 signal(SIGINT, SIG_DFL);
1826 raise(signo);
1827 }
1828
1829 /* An external diff command takes:
1830 *
1831 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1832 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1833 *
1834 */
1835 static void run_external_diff(const char *pgm,
1836 const char *name,
1837 const char *other,
1838 struct diff_filespec *one,
1839 struct diff_filespec *two,
1840 const char *xfrm_msg,
1841 int complete_rewrite)
1842 {
1843 const char *spawn_arg[10];
1844 struct diff_tempfile *temp = diff_temp;
1845 int retval;
1846 static int atexit_asked = 0;
1847 const char *othername;
1848 const char **arg = &spawn_arg[0];
1849
1850 othername = (other? other : name);
1851 if (one && two) {
1852 prepare_temp_file(name, &temp[0], one);
1853 prepare_temp_file(othername, &temp[1], two);
1854 if (! atexit_asked &&
1855 (temp[0].name == temp[0].tmp_path ||
1856 temp[1].name == temp[1].tmp_path)) {
1857 atexit_asked = 1;
1858 atexit(remove_tempfile);
1859 }
1860 signal(SIGINT, remove_tempfile_on_signal);
1861 }
1862
1863 if (one && two) {
1864 *arg++ = pgm;
1865 *arg++ = name;
1866 *arg++ = temp[0].name;
1867 *arg++ = temp[0].hex;
1868 *arg++ = temp[0].mode;
1869 *arg++ = temp[1].name;
1870 *arg++ = temp[1].hex;
1871 *arg++ = temp[1].mode;
1872 if (other) {
1873 *arg++ = other;
1874 *arg++ = xfrm_msg;
1875 }
1876 } else {
1877 *arg++ = pgm;
1878 *arg++ = name;
1879 }
1880 *arg = NULL;
1881 fflush(NULL);
1882 retval = run_command_v_opt(spawn_arg, 0);
1883 remove_tempfile();
1884 if (retval) {
1885 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1886 exit(1);
1887 }
1888 }
1889
1890 static const char *external_diff_attr(const char *name)
1891 {
1892 struct git_attr_check attr_diff_check;
1893
1894 setup_diff_attr_check(&attr_diff_check);
1895 if (!git_checkattr(name, 1, &attr_diff_check)) {
1896 const char *value = attr_diff_check.value;
1897 if (!ATTR_TRUE(value) &&
1898 !ATTR_FALSE(value) &&
1899 !ATTR_UNSET(value)) {
1900 struct ll_diff_driver *drv;
1901
1902 read_config_if_needed();
1903 for (drv = user_diff; drv; drv = drv->next)
1904 if (!strcmp(drv->name, value))
1905 return drv->cmd;
1906 }
1907 }
1908 return NULL;
1909 }
1910
1911 static void run_diff_cmd(const char *pgm,
1912 const char *name,
1913 const char *other,
1914 struct diff_filespec *one,
1915 struct diff_filespec *two,
1916 const char *xfrm_msg,
1917 struct diff_options *o,
1918 int complete_rewrite)
1919 {
1920 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
1921 pgm = NULL;
1922 else {
1923 const char *cmd = external_diff_attr(name);
1924 if (cmd)
1925 pgm = cmd;
1926 }
1927
1928 if (pgm) {
1929 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1930 complete_rewrite);
1931 return;
1932 }
1933 if (one && two)
1934 builtin_diff(name, other ? other : name,
1935 one, two, xfrm_msg, o, complete_rewrite);
1936 else
1937 printf("* Unmerged path %s\n", name);
1938 }
1939
1940 static void diff_fill_sha1_info(struct diff_filespec *one)
1941 {
1942 if (DIFF_FILE_VALID(one)) {
1943 if (!one->sha1_valid) {
1944 struct stat st;
1945 if (!strcmp(one->path, "-")) {
1946 hashcpy(one->sha1, null_sha1);
1947 return;
1948 }
1949 if (lstat(one->path, &st) < 0)
1950 die("stat %s", one->path);
1951 if (index_path(one->sha1, one->path, &st, 0))
1952 die("cannot hash %s\n", one->path);
1953 }
1954 }
1955 else
1956 hashclr(one->sha1);
1957 }
1958
1959 static int similarity_index(struct diff_filepair *p)
1960 {
1961 return p->score * 100 / MAX_SCORE;
1962 }
1963
1964 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1965 {
1966 const char *pgm = external_diff();
1967 struct strbuf msg;
1968 char *xfrm_msg;
1969 struct diff_filespec *one = p->one;
1970 struct diff_filespec *two = p->two;
1971 const char *name;
1972 const char *other;
1973 int complete_rewrite = 0;
1974
1975
1976 if (DIFF_PAIR_UNMERGED(p)) {
1977 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1978 return;
1979 }
1980
1981 name = p->one->path;
1982 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1983 diff_fill_sha1_info(one);
1984 diff_fill_sha1_info(two);
1985
1986 strbuf_init(&msg, PATH_MAX * 2 + 300);
1987 switch (p->status) {
1988 case DIFF_STATUS_COPIED:
1989 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1990 strbuf_addstr(&msg, "\ncopy from ");
1991 quote_c_style(name, &msg, NULL, 0);
1992 strbuf_addstr(&msg, "\ncopy to ");
1993 quote_c_style(other, &msg, NULL, 0);
1994 strbuf_addch(&msg, '\n');
1995 break;
1996 case DIFF_STATUS_RENAMED:
1997 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1998 strbuf_addstr(&msg, "\nrename from ");
1999 quote_c_style(name, &msg, NULL, 0);
2000 strbuf_addstr(&msg, "\nrename to ");
2001 quote_c_style(other, &msg, NULL, 0);
2002 strbuf_addch(&msg, '\n');
2003 break;
2004 case DIFF_STATUS_MODIFIED:
2005 if (p->score) {
2006 strbuf_addf(&msg, "dissimilarity index %d%%\n",
2007 similarity_index(p));
2008 complete_rewrite = 1;
2009 break;
2010 }
2011 /* fallthru */
2012 default:
2013 /* nothing */
2014 ;
2015 }
2016
2017 if (hashcmp(one->sha1, two->sha1)) {
2018 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2019
2020 if (DIFF_OPT_TST(o, BINARY)) {
2021 mmfile_t mf;
2022 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2023 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2024 abbrev = 40;
2025 }
2026 strbuf_addf(&msg, "index %.*s..%.*s",
2027 abbrev, sha1_to_hex(one->sha1),
2028 abbrev, sha1_to_hex(two->sha1));
2029 if (one->mode == two->mode)
2030 strbuf_addf(&msg, " %06o", one->mode);
2031 strbuf_addch(&msg, '\n');
2032 }
2033
2034 if (msg.len)
2035 strbuf_setlen(&msg, msg.len - 1);
2036 xfrm_msg = msg.len ? msg.buf : NULL;
2037
2038 if (!pgm &&
2039 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2040 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2041 /* a filepair that changes between file and symlink
2042 * needs to be split into deletion and creation.
2043 */
2044 struct diff_filespec *null = alloc_filespec(two->path);
2045 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
2046 free(null);
2047 null = alloc_filespec(one->path);
2048 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
2049 free(null);
2050 }
2051 else
2052 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
2053 complete_rewrite);
2054
2055 strbuf_release(&msg);
2056 }
2057
2058 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2059 struct diffstat_t *diffstat)
2060 {
2061 const char *name;
2062 const char *other;
2063 int complete_rewrite = 0;
2064
2065 if (DIFF_PAIR_UNMERGED(p)) {
2066 /* unmerged */
2067 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2068 return;
2069 }
2070
2071 name = p->one->path;
2072 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2073
2074 diff_fill_sha1_info(p->one);
2075 diff_fill_sha1_info(p->two);
2076
2077 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2078 complete_rewrite = 1;
2079 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2080 }
2081
2082 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2083 {
2084 const char *name;
2085 const char *other;
2086
2087 if (DIFF_PAIR_UNMERGED(p)) {
2088 /* unmerged */
2089 return;
2090 }
2091
2092 name = p->one->path;
2093 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2094
2095 diff_fill_sha1_info(p->one);
2096 diff_fill_sha1_info(p->two);
2097
2098 builtin_checkdiff(name, other, p->one, p->two, o);
2099 }
2100
2101 void diff_setup(struct diff_options *options)
2102 {
2103 memset(options, 0, sizeof(*options));
2104 options->line_termination = '\n';
2105 options->break_opt = -1;
2106 options->rename_limit = -1;
2107 options->context = 3;
2108 options->msg_sep = "";
2109
2110 options->change = diff_change;
2111 options->add_remove = diff_addremove;
2112 if (diff_use_color_default)
2113 DIFF_OPT_SET(options, COLOR_DIFF);
2114 else
2115 DIFF_OPT_CLR(options, COLOR_DIFF);
2116 options->detect_rename = diff_detect_rename_default;
2117 }
2118
2119 int diff_setup_done(struct diff_options *options)
2120 {
2121 int count = 0;
2122
2123 if (options->output_format & DIFF_FORMAT_NAME)
2124 count++;
2125 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2126 count++;
2127 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2128 count++;
2129 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2130 count++;
2131 if (count > 1)
2132 die("--name-only, --name-status, --check and -s are mutually exclusive");
2133
2134 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2135 options->detect_rename = DIFF_DETECT_COPY;
2136
2137 if (options->output_format & (DIFF_FORMAT_NAME |
2138 DIFF_FORMAT_NAME_STATUS |
2139 DIFF_FORMAT_CHECKDIFF |
2140 DIFF_FORMAT_NO_OUTPUT))
2141 options->output_format &= ~(DIFF_FORMAT_RAW |
2142 DIFF_FORMAT_NUMSTAT |
2143 DIFF_FORMAT_DIFFSTAT |
2144 DIFF_FORMAT_SHORTSTAT |
2145 DIFF_FORMAT_SUMMARY |
2146 DIFF_FORMAT_PATCH);
2147
2148 /*
2149 * These cases always need recursive; we do not drop caller-supplied
2150 * recursive bits for other formats here.
2151 */
2152 if (options->output_format & (DIFF_FORMAT_PATCH |
2153 DIFF_FORMAT_NUMSTAT |
2154 DIFF_FORMAT_DIFFSTAT |
2155 DIFF_FORMAT_SHORTSTAT |
2156 DIFF_FORMAT_SUMMARY |
2157 DIFF_FORMAT_CHECKDIFF))
2158 DIFF_OPT_SET(options, RECURSIVE);
2159 /*
2160 * Also pickaxe would not work very well if you do not say recursive
2161 */
2162 if (options->pickaxe)
2163 DIFF_OPT_SET(options, RECURSIVE);
2164
2165 if (options->detect_rename && options->rename_limit < 0)
2166 options->rename_limit = diff_rename_limit_default;
2167 if (options->setup & DIFF_SETUP_USE_CACHE) {
2168 if (!active_cache)
2169 /* read-cache does not die even when it fails
2170 * so it is safe for us to do this here. Also
2171 * it does not smudge active_cache or active_nr
2172 * when it fails, so we do not have to worry about
2173 * cleaning it up ourselves either.
2174 */
2175 read_cache();
2176 }
2177 if (options->abbrev <= 0 || 40 < options->abbrev)
2178 options->abbrev = 40; /* full */
2179
2180 /*
2181 * It does not make sense to show the first hit we happened
2182 * to have found. It does not make sense not to return with
2183 * exit code in such a case either.
2184 */
2185 if (DIFF_OPT_TST(options, QUIET)) {
2186 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2187 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2188 }
2189
2190 /*
2191 * If we postprocess in diffcore, we cannot simply return
2192 * upon the first hit. We need to run diff as usual.
2193 */
2194 if (options->pickaxe || options->filter)
2195 DIFF_OPT_CLR(options, QUIET);
2196
2197 return 0;
2198 }
2199
2200 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2201 {
2202 char c, *eq;
2203 int len;
2204
2205 if (*arg != '-')
2206 return 0;
2207 c = *++arg;
2208 if (!c)
2209 return 0;
2210 if (c == arg_short) {
2211 c = *++arg;
2212 if (!c)
2213 return 1;
2214 if (val && isdigit(c)) {
2215 char *end;
2216 int n = strtoul(arg, &end, 10);
2217 if (*end)
2218 return 0;
2219 *val = n;
2220 return 1;
2221 }
2222 return 0;
2223 }
2224 if (c != '-')
2225 return 0;
2226 arg++;
2227 eq = strchr(arg, '=');
2228 if (eq)
2229 len = eq - arg;
2230 else
2231 len = strlen(arg);
2232 if (!len || strncmp(arg, arg_long, len))
2233 return 0;
2234 if (eq) {
2235 int n;
2236 char *end;
2237 if (!isdigit(*++eq))
2238 return 0;
2239 n = strtoul(eq, &end, 10);
2240 if (*end)
2241 return 0;
2242 *val = n;
2243 }
2244 return 1;
2245 }
2246
2247 static int diff_scoreopt_parse(const char *opt);
2248
2249 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2250 {
2251 const char *arg = av[0];
2252
2253 /* Output format options */
2254 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2255 options->output_format |= DIFF_FORMAT_PATCH;
2256 else if (opt_arg(arg, 'U', "unified", &options->context))
2257 options->output_format |= DIFF_FORMAT_PATCH;
2258 else if (!strcmp(arg, "--raw"))
2259 options->output_format |= DIFF_FORMAT_RAW;
2260 else if (!strcmp(arg, "--patch-with-raw"))
2261 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2262 else if (!strcmp(arg, "--numstat"))
2263 options->output_format |= DIFF_FORMAT_NUMSTAT;
2264 else if (!strcmp(arg, "--shortstat"))
2265 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2266 else if (!strcmp(arg, "--check"))
2267 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2268 else if (!strcmp(arg, "--summary"))
2269 options->output_format |= DIFF_FORMAT_SUMMARY;
2270 else if (!strcmp(arg, "--patch-with-stat"))
2271 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2272 else if (!strcmp(arg, "--name-only"))
2273 options->output_format |= DIFF_FORMAT_NAME;
2274 else if (!strcmp(arg, "--name-status"))
2275 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2276 else if (!strcmp(arg, "-s"))
2277 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2278 else if (!prefixcmp(arg, "--stat")) {
2279 char *end;
2280 int width = options->stat_width;
2281 int name_width = options->stat_name_width;
2282 arg += 6;
2283 end = (char *)arg;
2284
2285 switch (*arg) {
2286 case '-':
2287 if (!prefixcmp(arg, "-width="))
2288 width = strtoul(arg + 7, &end, 10);
2289 else if (!prefixcmp(arg, "-name-width="))
2290 name_width = strtoul(arg + 12, &end, 10);
2291 break;
2292 case '=':
2293 width = strtoul(arg+1, &end, 10);
2294 if (*end == ',')
2295 name_width = strtoul(end+1, &end, 10);
2296 }
2297
2298 /* Important! This checks all the error cases! */
2299 if (*end)
2300 return 0;
2301 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2302 options->stat_name_width = name_width;
2303 options->stat_width = width;
2304 }
2305
2306 /* renames options */
2307 else if (!prefixcmp(arg, "-B")) {
2308 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2309 return -1;
2310 }
2311 else if (!prefixcmp(arg, "-M")) {
2312 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2313 return -1;
2314 options->detect_rename = DIFF_DETECT_RENAME;
2315 }
2316 else if (!prefixcmp(arg, "-C")) {
2317 if (options->detect_rename == DIFF_DETECT_COPY)
2318 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2319 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2320 return -1;
2321 options->detect_rename = DIFF_DETECT_COPY;
2322 }
2323 else if (!strcmp(arg, "--no-renames"))
2324 options->detect_rename = 0;
2325
2326 /* xdiff options */
2327 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2328 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2329 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2330 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2331 else if (!strcmp(arg, "--ignore-space-at-eol"))
2332 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2333
2334 /* flags options */
2335 else if (!strcmp(arg, "--binary")) {
2336 options->output_format |= DIFF_FORMAT_PATCH;
2337 DIFF_OPT_SET(options, BINARY);
2338 }
2339 else if (!strcmp(arg, "--full-index"))
2340 DIFF_OPT_SET(options, FULL_INDEX);
2341 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2342 DIFF_OPT_SET(options, TEXT);
2343 else if (!strcmp(arg, "-R"))
2344 DIFF_OPT_SET(options, REVERSE_DIFF);
2345 else if (!strcmp(arg, "--find-copies-harder"))
2346 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2347 else if (!strcmp(arg, "--follow"))
2348 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2349 else if (!strcmp(arg, "--color"))
2350 DIFF_OPT_SET(options, COLOR_DIFF);
2351 else if (!strcmp(arg, "--no-color"))
2352 DIFF_OPT_CLR(options, COLOR_DIFF);
2353 else if (!strcmp(arg, "--color-words"))
2354 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2355 else if (!strcmp(arg, "--exit-code"))
2356 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2357 else if (!strcmp(arg, "--quiet"))
2358 DIFF_OPT_SET(options, QUIET);
2359 else if (!strcmp(arg, "--ext-diff"))
2360 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2361 else if (!strcmp(arg, "--no-ext-diff"))
2362 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2363
2364 /* misc options */
2365 else if (!strcmp(arg, "-z"))
2366 options->line_termination = 0;
2367 else if (!prefixcmp(arg, "-l"))
2368 options->rename_limit = strtoul(arg+2, NULL, 10);
2369 else if (!prefixcmp(arg, "-S"))
2370 options->pickaxe = arg + 2;
2371 else if (!strcmp(arg, "--pickaxe-all"))
2372 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2373 else if (!strcmp(arg, "--pickaxe-regex"))
2374 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2375 else if (!prefixcmp(arg, "-O"))
2376 options->orderfile = arg + 2;
2377 else if (!prefixcmp(arg, "--diff-filter="))
2378 options->filter = arg + 14;
2379 else if (!strcmp(arg, "--abbrev"))
2380 options->abbrev = DEFAULT_ABBREV;
2381 else if (!prefixcmp(arg, "--abbrev=")) {
2382 options->abbrev = strtoul(arg + 9, NULL, 10);
2383 if (options->abbrev < MINIMUM_ABBREV)
2384 options->abbrev = MINIMUM_ABBREV;
2385 else if (40 < options->abbrev)
2386 options->abbrev = 40;
2387 }
2388 else
2389 return 0;
2390 return 1;
2391 }
2392
2393 static int parse_num(const char **cp_p)
2394 {
2395 unsigned long num, scale;
2396 int ch, dot;
2397 const char *cp = *cp_p;
2398
2399 num = 0;
2400 scale = 1;
2401 dot = 0;
2402 for(;;) {
2403 ch = *cp;
2404 if ( !dot && ch == '.' ) {
2405 scale = 1;
2406 dot = 1;
2407 } else if ( ch == '%' ) {
2408 scale = dot ? scale*100 : 100;
2409 cp++; /* % is always at the end */
2410 break;
2411 } else if ( ch >= '0' && ch <= '9' ) {
2412 if ( scale < 100000 ) {
2413 scale *= 10;
2414 num = (num*10) + (ch-'0');
2415 }
2416 } else {
2417 break;
2418 }
2419 cp++;
2420 }
2421 *cp_p = cp;
2422
2423 /* user says num divided by scale and we say internally that
2424 * is MAX_SCORE * num / scale.
2425 */
2426 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2427 }
2428
2429 static int diff_scoreopt_parse(const char *opt)
2430 {
2431 int opt1, opt2, cmd;
2432
2433 if (*opt++ != '-')
2434 return -1;
2435 cmd = *opt++;
2436 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2437 return -1; /* that is not a -M, -C nor -B option */
2438
2439 opt1 = parse_num(&opt);
2440 if (cmd != 'B')
2441 opt2 = 0;
2442 else {
2443 if (*opt == 0)
2444 opt2 = 0;
2445 else if (*opt != '/')
2446 return -1; /* we expect -B80/99 or -B80 */
2447 else {
2448 opt++;
2449 opt2 = parse_num(&opt);
2450 }
2451 }
2452 if (*opt != 0)
2453 return -1;
2454 return opt1 | (opt2 << 16);
2455 }
2456
2457 struct diff_queue_struct diff_queued_diff;
2458
2459 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2460 {
2461 if (queue->alloc <= queue->nr) {
2462 queue->alloc = alloc_nr(queue->alloc);
2463 queue->queue = xrealloc(queue->queue,
2464 sizeof(dp) * queue->alloc);
2465 }
2466 queue->queue[queue->nr++] = dp;
2467 }
2468
2469 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2470 struct diff_filespec *one,
2471 struct diff_filespec *two)
2472 {
2473 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2474 dp->one = one;
2475 dp->two = two;
2476 if (queue)
2477 diff_q(queue, dp);
2478 return dp;
2479 }
2480
2481 void diff_free_filepair(struct diff_filepair *p)
2482 {
2483 free_filespec(p->one);
2484 free_filespec(p->two);
2485 free(p);
2486 }
2487
2488 /* This is different from find_unique_abbrev() in that
2489 * it stuffs the result with dots for alignment.
2490 */
2491 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2492 {
2493 int abblen;
2494 const char *abbrev;
2495 if (len == 40)
2496 return sha1_to_hex(sha1);
2497
2498 abbrev = find_unique_abbrev(sha1, len);
2499 if (!abbrev)
2500 return sha1_to_hex(sha1);
2501 abblen = strlen(abbrev);
2502 if (abblen < 37) {
2503 static char hex[41];
2504 if (len < abblen && abblen <= len + 2)
2505 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2506 else
2507 sprintf(hex, "%s...", abbrev);
2508 return hex;
2509 }
2510 return sha1_to_hex(sha1);
2511 }
2512
2513 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2514 {
2515 int line_termination = opt->line_termination;
2516 int inter_name_termination = line_termination ? '\t' : '\0';
2517
2518 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2519 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2520 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2521 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2522 }
2523 if (p->score) {
2524 printf("%c%03d%c", p->status, similarity_index(p),
2525 inter_name_termination);
2526 } else {
2527 printf("%c%c", p->status, inter_name_termination);
2528 }
2529
2530 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2531 write_name_quoted(p->one->path, stdout, inter_name_termination);
2532 write_name_quoted(p->two->path, stdout, line_termination);
2533 } else {
2534 const char *path = p->one->mode ? p->one->path : p->two->path;
2535 write_name_quoted(path, stdout, line_termination);
2536 }
2537 }
2538
2539 int diff_unmodified_pair(struct diff_filepair *p)
2540 {
2541 /* This function is written stricter than necessary to support
2542 * the currently implemented transformers, but the idea is to
2543 * let transformers to produce diff_filepairs any way they want,
2544 * and filter and clean them up here before producing the output.
2545 */
2546 struct diff_filespec *one = p->one, *two = p->two;
2547
2548 if (DIFF_PAIR_UNMERGED(p))
2549 return 0; /* unmerged is interesting */
2550
2551 /* deletion, addition, mode or type change
2552 * and rename are all interesting.
2553 */
2554 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2555 DIFF_PAIR_MODE_CHANGED(p) ||
2556 strcmp(one->path, two->path))
2557 return 0;
2558
2559 /* both are valid and point at the same path. that is, we are
2560 * dealing with a change.
2561 */
2562 if (one->sha1_valid && two->sha1_valid &&
2563 !hashcmp(one->sha1, two->sha1))
2564 return 1; /* no change */
2565 if (!one->sha1_valid && !two->sha1_valid)
2566 return 1; /* both look at the same file on the filesystem. */
2567 return 0;
2568 }
2569
2570 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2571 {
2572 if (diff_unmodified_pair(p))
2573 return;
2574
2575 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2576 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2577 return; /* no tree diffs in patch format */
2578
2579 run_diff(p, o);
2580 }
2581
2582 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2583 struct diffstat_t *diffstat)
2584 {
2585 if (diff_unmodified_pair(p))
2586 return;
2587
2588 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2589 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2590 return; /* no tree diffs in patch format */
2591
2592 run_diffstat(p, o, diffstat);
2593 }
2594
2595 static void diff_flush_checkdiff(struct diff_filepair *p,
2596 struct diff_options *o)
2597 {
2598 if (diff_unmodified_pair(p))
2599 return;
2600
2601 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2602 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2603 return; /* no tree diffs in patch format */
2604
2605 run_checkdiff(p, o);
2606 }
2607
2608 int diff_queue_is_empty(void)
2609 {
2610 struct diff_queue_struct *q = &diff_queued_diff;
2611 int i;
2612 for (i = 0; i < q->nr; i++)
2613 if (!diff_unmodified_pair(q->queue[i]))
2614 return 0;
2615 return 1;
2616 }
2617
2618 #if DIFF_DEBUG
2619 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2620 {
2621 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2622 x, one ? one : "",
2623 s->path,
2624 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2625 s->mode,
2626 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2627 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2628 x, one ? one : "",
2629 s->size, s->xfrm_flags);
2630 }
2631
2632 void diff_debug_filepair(const struct diff_filepair *p, int i)
2633 {
2634 diff_debug_filespec(p->one, i, "one");
2635 diff_debug_filespec(p->two, i, "two");
2636 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2637 p->score, p->status ? p->status : '?',
2638 p->one->rename_used, p->broken_pair);
2639 }
2640
2641 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2642 {
2643 int i;
2644 if (msg)
2645 fprintf(stderr, "%s\n", msg);
2646 fprintf(stderr, "q->nr = %d\n", q->nr);
2647 for (i = 0; i < q->nr; i++) {
2648 struct diff_filepair *p = q->queue[i];
2649 diff_debug_filepair(p, i);
2650 }
2651 }
2652 #endif
2653
2654 static void diff_resolve_rename_copy(void)
2655 {
2656 int i;
2657 struct diff_filepair *p;
2658 struct diff_queue_struct *q = &diff_queued_diff;
2659
2660 diff_debug_queue("resolve-rename-copy", q);
2661
2662 for (i = 0; i < q->nr; i++) {
2663 p = q->queue[i];
2664 p->status = 0; /* undecided */
2665 if (DIFF_PAIR_UNMERGED(p))
2666 p->status = DIFF_STATUS_UNMERGED;
2667 else if (!DIFF_FILE_VALID(p->one))
2668 p->status = DIFF_STATUS_ADDED;
2669 else if (!DIFF_FILE_VALID(p->two))
2670 p->status = DIFF_STATUS_DELETED;
2671 else if (DIFF_PAIR_TYPE_CHANGED(p))
2672 p->status = DIFF_STATUS_TYPE_CHANGED;
2673
2674 /* from this point on, we are dealing with a pair
2675 * whose both sides are valid and of the same type, i.e.
2676 * either in-place edit or rename/copy edit.
2677 */
2678 else if (DIFF_PAIR_RENAME(p)) {
2679 /*
2680 * A rename might have re-connected a broken
2681 * pair up, causing the pathnames to be the
2682 * same again. If so, that's not a rename at
2683 * all, just a modification..
2684 *
2685 * Otherwise, see if this source was used for
2686 * multiple renames, in which case we decrement
2687 * the count, and call it a copy.
2688 */
2689 if (!strcmp(p->one->path, p->two->path))
2690 p->status = DIFF_STATUS_MODIFIED;
2691 else if (--p->one->rename_used > 0)
2692 p->status = DIFF_STATUS_COPIED;
2693 else
2694 p->status = DIFF_STATUS_RENAMED;
2695 }
2696 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2697 p->one->mode != p->two->mode ||
2698 is_null_sha1(p->one->sha1))
2699 p->status = DIFF_STATUS_MODIFIED;
2700 else {
2701 /* This is a "no-change" entry and should not
2702 * happen anymore, but prepare for broken callers.
2703 */
2704 error("feeding unmodified %s to diffcore",
2705 p->one->path);
2706 p->status = DIFF_STATUS_UNKNOWN;
2707 }
2708 }
2709 diff_debug_queue("resolve-rename-copy done", q);
2710 }
2711
2712 static int check_pair_status(struct diff_filepair *p)
2713 {
2714 switch (p->status) {
2715 case DIFF_STATUS_UNKNOWN:
2716 return 0;
2717 case 0:
2718 die("internal error in diff-resolve-rename-copy");
2719 default:
2720 return 1;
2721 }
2722 }
2723
2724 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2725 {
2726 int fmt = opt->output_format;
2727
2728 if (fmt & DIFF_FORMAT_CHECKDIFF)
2729 diff_flush_checkdiff(p, opt);
2730 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2731 diff_flush_raw(p, opt);
2732 else if (fmt & DIFF_FORMAT_NAME)
2733 write_name_quoted(p->two->path, stdout, opt->line_termination);
2734 }
2735
2736 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2737 {
2738 if (fs->mode)
2739 printf(" %s mode %06o ", newdelete, fs->mode);
2740 else
2741 printf(" %s ", newdelete);
2742 write_name_quoted(fs->path, stdout, '\n');
2743 }
2744
2745
2746 static void show_mode_change(struct diff_filepair *p, int show_name)
2747 {
2748 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2749 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2750 show_name ? ' ' : '\n');
2751 if (show_name) {
2752 write_name_quoted(p->two->path, stdout, '\n');
2753 }
2754 }
2755 }
2756
2757 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2758 {
2759 char *names = pprint_rename(p->one->path, p->two->path);
2760
2761 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2762 free(names);
2763 show_mode_change(p, 0);
2764 }
2765
2766 static void diff_summary(struct diff_filepair *p)
2767 {
2768 switch(p->status) {
2769 case DIFF_STATUS_DELETED:
2770 show_file_mode_name("delete", p->one);
2771 break;
2772 case DIFF_STATUS_ADDED:
2773 show_file_mode_name("create", p->two);
2774 break;
2775 case DIFF_STATUS_COPIED:
2776 show_rename_copy("copy", p);
2777 break;
2778 case DIFF_STATUS_RENAMED:
2779 show_rename_copy("rename", p);
2780 break;
2781 default:
2782 if (p->score) {
2783 fputs(" rewrite ", stdout);
2784 write_name_quoted(p->two->path, stdout, ' ');
2785 printf("(%d%%)\n", similarity_index(p));
2786 }
2787 show_mode_change(p, !p->score);
2788 break;
2789 }
2790 }
2791
2792 struct patch_id_t {
2793 struct xdiff_emit_state xm;
2794 SHA_CTX *ctx;
2795 int patchlen;
2796 };
2797
2798 static int remove_space(char *line, int len)
2799 {
2800 int i;
2801 char *dst = line;
2802 unsigned char c;
2803
2804 for (i = 0; i < len; i++)
2805 if (!isspace((c = line[i])))
2806 *dst++ = c;
2807
2808 return dst - line;
2809 }
2810
2811 static void patch_id_consume(void *priv, char *line, unsigned long len)
2812 {
2813 struct patch_id_t *data = priv;
2814 int new_len;
2815
2816 /* Ignore line numbers when computing the SHA1 of the patch */
2817 if (!prefixcmp(line, "@@ -"))
2818 return;
2819
2820 new_len = remove_space(line, len);
2821
2822 SHA1_Update(data->ctx, line, new_len);
2823 data->patchlen += new_len;
2824 }
2825
2826 /* returns 0 upon success, and writes result into sha1 */
2827 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2828 {
2829 struct diff_queue_struct *q = &diff_queued_diff;
2830 int i;
2831 SHA_CTX ctx;
2832 struct patch_id_t data;
2833 char buffer[PATH_MAX * 4 + 20];
2834
2835 SHA1_Init(&ctx);
2836 memset(&data, 0, sizeof(struct patch_id_t));
2837 data.ctx = &ctx;
2838 data.xm.consume = patch_id_consume;
2839
2840 for (i = 0; i < q->nr; i++) {
2841 xpparam_t xpp;
2842 xdemitconf_t xecfg;
2843 xdemitcb_t ecb;
2844 mmfile_t mf1, mf2;
2845 struct diff_filepair *p = q->queue[i];
2846 int len1, len2;
2847
2848 memset(&xecfg, 0, sizeof(xecfg));
2849 if (p->status == 0)
2850 return error("internal diff status error");
2851 if (p->status == DIFF_STATUS_UNKNOWN)
2852 continue;
2853 if (diff_unmodified_pair(p))
2854 continue;
2855 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2856 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2857 continue;
2858 if (DIFF_PAIR_UNMERGED(p))
2859 continue;
2860
2861 diff_fill_sha1_info(p->one);
2862 diff_fill_sha1_info(p->two);
2863 if (fill_mmfile(&mf1, p->one) < 0 ||
2864 fill_mmfile(&mf2, p->two) < 0)
2865 return error("unable to read files to diff");
2866
2867 len1 = remove_space(p->one->path, strlen(p->one->path));
2868 len2 = remove_space(p->two->path, strlen(p->two->path));
2869 if (p->one->mode == 0)
2870 len1 = snprintf(buffer, sizeof(buffer),
2871 "diff--gita/%.*sb/%.*s"
2872 "newfilemode%06o"
2873 "---/dev/null"
2874 "+++b/%.*s",
2875 len1, p->one->path,
2876 len2, p->two->path,
2877 p->two->mode,
2878 len2, p->two->path);
2879 else if (p->two->mode == 0)
2880 len1 = snprintf(buffer, sizeof(buffer),
2881 "diff--gita/%.*sb/%.*s"
2882 "deletedfilemode%06o"
2883 "---a/%.*s"
2884 "+++/dev/null",
2885 len1, p->one->path,
2886 len2, p->two->path,
2887 p->one->mode,
2888 len1, p->one->path);
2889 else
2890 len1 = snprintf(buffer, sizeof(buffer),
2891 "diff--gita/%.*sb/%.*s"
2892 "---a/%.*s"
2893 "+++b/%.*s",
2894 len1, p->one->path,
2895 len2, p->two->path,
2896 len1, p->one->path,
2897 len2, p->two->path);
2898 SHA1_Update(&ctx, buffer, len1);
2899
2900 xpp.flags = XDF_NEED_MINIMAL;
2901 xecfg.ctxlen = 3;
2902 xecfg.flags = XDL_EMIT_FUNCNAMES;
2903 ecb.outf = xdiff_outf;
2904 ecb.priv = &data;
2905 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2906 }
2907
2908 SHA1_Final(sha1, &ctx);
2909 return 0;
2910 }
2911
2912 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2913 {
2914 struct diff_queue_struct *q = &diff_queued_diff;
2915 int i;
2916 int result = diff_get_patch_id(options, sha1);
2917
2918 for (i = 0; i < q->nr; i++)
2919 diff_free_filepair(q->queue[i]);
2920
2921 free(q->queue);
2922 q->queue = NULL;
2923 q->nr = q->alloc = 0;
2924
2925 return result;
2926 }
2927
2928 static int is_summary_empty(const struct diff_queue_struct *q)
2929 {
2930 int i;
2931
2932 for (i = 0; i < q->nr; i++) {
2933 const struct diff_filepair *p = q->queue[i];
2934
2935 switch (p->status) {
2936 case DIFF_STATUS_DELETED:
2937 case DIFF_STATUS_ADDED:
2938 case DIFF_STATUS_COPIED:
2939 case DIFF_STATUS_RENAMED:
2940 return 0;
2941 default:
2942 if (p->score)
2943 return 0;
2944 if (p->one->mode && p->two->mode &&
2945 p->one->mode != p->two->mode)
2946 return 0;
2947 break;
2948 }
2949 }
2950 return 1;
2951 }
2952
2953 void diff_flush(struct diff_options *options)
2954 {
2955 struct diff_queue_struct *q = &diff_queued_diff;
2956 int i, output_format = options->output_format;
2957 int separator = 0;
2958
2959 /*
2960 * Order: raw, stat, summary, patch
2961 * or: name/name-status/checkdiff (other bits clear)
2962 */
2963 if (!q->nr)
2964 goto free_queue;
2965
2966 if (output_format & (DIFF_FORMAT_RAW |
2967 DIFF_FORMAT_NAME |
2968 DIFF_FORMAT_NAME_STATUS |
2969 DIFF_FORMAT_CHECKDIFF)) {
2970 for (i = 0; i < q->nr; i++) {
2971 struct diff_filepair *p = q->queue[i];
2972 if (check_pair_status(p))
2973 flush_one_pair(p, options);
2974 }
2975 separator++;
2976 }
2977
2978 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2979 struct diffstat_t diffstat;
2980
2981 memset(&diffstat, 0, sizeof(struct diffstat_t));
2982 diffstat.xm.consume = diffstat_consume;
2983 for (i = 0; i < q->nr; i++) {
2984 struct diff_filepair *p = q->queue[i];
2985 if (check_pair_status(p))
2986 diff_flush_stat(p, options, &diffstat);
2987 }
2988 if (output_format & DIFF_FORMAT_NUMSTAT)
2989 show_numstat(&diffstat, options);
2990 if (output_format & DIFF_FORMAT_DIFFSTAT)
2991 show_stats(&diffstat, options);
2992 if (output_format & DIFF_FORMAT_SHORTSTAT)
2993 show_shortstats(&diffstat);
2994 free_diffstat_info(&diffstat);
2995 separator++;
2996 }
2997
2998 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2999 for (i = 0; i < q->nr; i++)
3000 diff_summary(q->queue[i]);
3001 separator++;
3002 }
3003
3004 if (output_format & DIFF_FORMAT_PATCH) {
3005 if (separator) {
3006 if (options->stat_sep) {
3007 /* attach patch instead of inline */
3008 fputs(options->stat_sep, stdout);
3009 } else {
3010 putchar(options->line_termination);
3011 }
3012 }
3013
3014 for (i = 0; i < q->nr; i++) {
3015 struct diff_filepair *p = q->queue[i];
3016 if (check_pair_status(p))
3017 diff_flush_patch(p, options);
3018 }
3019 }
3020
3021 if (output_format & DIFF_FORMAT_CALLBACK)
3022 options->format_callback(q, options, options->format_callback_data);
3023
3024 for (i = 0; i < q->nr; i++)
3025 diff_free_filepair(q->queue[i]);
3026 free_queue:
3027 free(q->queue);
3028 q->queue = NULL;
3029 q->nr = q->alloc = 0;
3030 }
3031
3032 static void diffcore_apply_filter(const char *filter)
3033 {
3034 int i;
3035 struct diff_queue_struct *q = &diff_queued_diff;
3036 struct diff_queue_struct outq;
3037 outq.queue = NULL;
3038 outq.nr = outq.alloc = 0;
3039
3040 if (!filter)
3041 return;
3042
3043 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3044 int found;
3045 for (i = found = 0; !found && i < q->nr; i++) {
3046 struct diff_filepair *p = q->queue[i];
3047 if (((p->status == DIFF_STATUS_MODIFIED) &&
3048 ((p->score &&
3049 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3050 (!p->score &&
3051 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3052 ((p->status != DIFF_STATUS_MODIFIED) &&
3053 strchr(filter, p->status)))
3054 found++;
3055 }
3056 if (found)
3057 return;
3058
3059 /* otherwise we will clear the whole queue
3060 * by copying the empty outq at the end of this
3061 * function, but first clear the current entries
3062 * in the queue.
3063 */
3064 for (i = 0; i < q->nr; i++)
3065 diff_free_filepair(q->queue[i]);
3066 }
3067 else {
3068 /* Only the matching ones */
3069 for (i = 0; i < q->nr; i++) {
3070 struct diff_filepair *p = q->queue[i];
3071
3072 if (((p->status == DIFF_STATUS_MODIFIED) &&
3073 ((p->score &&
3074 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3075 (!p->score &&
3076 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3077 ((p->status != DIFF_STATUS_MODIFIED) &&
3078 strchr(filter, p->status)))
3079 diff_q(&outq, p);
3080 else
3081 diff_free_filepair(p);
3082 }
3083 }
3084 free(q->queue);
3085 *q = outq;
3086 }
3087
3088 /* Check whether two filespecs with the same mode and size are identical */
3089 static int diff_filespec_is_identical(struct diff_filespec *one,
3090 struct diff_filespec *two)
3091 {
3092 if (S_ISGITLINK(one->mode)) {
3093 diff_fill_sha1_info(one);
3094 diff_fill_sha1_info(two);
3095 return !hashcmp(one->sha1, two->sha1);
3096 }
3097 if (diff_populate_filespec(one, 0))
3098 return 0;
3099 if (diff_populate_filespec(two, 0))
3100 return 0;
3101 return !memcmp(one->data, two->data, one->size);
3102 }
3103
3104 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3105 {
3106 int i;
3107 struct diff_queue_struct *q = &diff_queued_diff;
3108 struct diff_queue_struct outq;
3109 outq.queue = NULL;
3110 outq.nr = outq.alloc = 0;
3111
3112 for (i = 0; i < q->nr; i++) {
3113 struct diff_filepair *p = q->queue[i];
3114
3115 /*
3116 * 1. Entries that come from stat info dirtyness
3117 * always have both sides (iow, not create/delete),
3118 * one side of the object name is unknown, with
3119 * the same mode and size. Keep the ones that
3120 * do not match these criteria. They have real
3121 * differences.
3122 *
3123 * 2. At this point, the file is known to be modified,
3124 * with the same mode and size, and the object
3125 * name of one side is unknown. Need to inspect
3126 * the identical contents.
3127 */
3128 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3129 !DIFF_FILE_VALID(p->two) ||
3130 (p->one->sha1_valid && p->two->sha1_valid) ||
3131 (p->one->mode != p->two->mode) ||
3132 diff_populate_filespec(p->one, 1) ||
3133 diff_populate_filespec(p->two, 1) ||
3134 (p->one->size != p->two->size) ||
3135 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3136 diff_q(&outq, p);
3137 else {
3138 /*
3139 * The caller can subtract 1 from skip_stat_unmatch
3140 * to determine how many paths were dirty only
3141 * due to stat info mismatch.
3142 */
3143 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3144 diffopt->skip_stat_unmatch++;
3145 diff_free_filepair(p);
3146 }
3147 }
3148 free(q->queue);
3149 *q = outq;
3150 }
3151
3152 void diffcore_std(struct diff_options *options)
3153 {
3154 if (DIFF_OPT_TST(options, QUIET))
3155 return;
3156
3157 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3158 diffcore_skip_stat_unmatch(options);
3159 if (options->break_opt != -1)
3160 diffcore_break(options->break_opt);
3161 if (options->detect_rename)
3162 diffcore_rename(options);
3163 if (options->break_opt != -1)
3164 diffcore_merge_broken();
3165 if (options->pickaxe)
3166 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3167 if (options->orderfile)
3168 diffcore_order(options->orderfile);
3169 diff_resolve_rename_copy();
3170 diffcore_apply_filter(options->filter);
3171
3172 if (diff_queued_diff.nr)
3173 DIFF_OPT_SET(options, HAS_CHANGES);
3174 else
3175 DIFF_OPT_CLR(options, HAS_CHANGES);
3176 }
3177
3178 int diff_result_code(struct diff_options *opt, int status)
3179 {
3180 int result = 0;
3181 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3182 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3183 return status;
3184 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3185 DIFF_OPT_TST(opt, HAS_CHANGES))
3186 result |= 01;
3187 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3188 DIFF_OPT_TST(opt, CHECK_FAILED))
3189 result |= 02;
3190 return result;
3191 }
3192
3193 void diff_addremove(struct diff_options *options,
3194 int addremove, unsigned mode,
3195 const unsigned char *sha1,
3196 const char *base, const char *path)
3197 {
3198 char concatpath[PATH_MAX];
3199 struct diff_filespec *one, *two;
3200
3201 /* This may look odd, but it is a preparation for
3202 * feeding "there are unchanged files which should
3203 * not produce diffs, but when you are doing copy
3204 * detection you would need them, so here they are"
3205 * entries to the diff-core. They will be prefixed
3206 * with something like '=' or '*' (I haven't decided
3207 * which but should not make any difference).
3208 * Feeding the same new and old to diff_change()
3209 * also has the same effect.
3210 * Before the final output happens, they are pruned after
3211 * merged into rename/copy pairs as appropriate.
3212 */
3213 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3214 addremove = (addremove == '+' ? '-' :
3215 addremove == '-' ? '+' : addremove);
3216
3217 if (!path) path = "";
3218 sprintf(concatpath, "%s%s", base, path);
3219 one = alloc_filespec(concatpath);
3220 two = alloc_filespec(concatpath);
3221
3222 if (addremove != '+')
3223 fill_filespec(one, sha1, mode);
3224 if (addremove != '-')
3225 fill_filespec(two, sha1, mode);
3226
3227 diff_queue(&diff_queued_diff, one, two);
3228 DIFF_OPT_SET(options, HAS_CHANGES);
3229 }
3230
3231 void diff_change(struct diff_options *options,
3232 unsigned old_mode, unsigned new_mode,
3233 const unsigned char *old_sha1,
3234 const unsigned char *new_sha1,
3235 const char *base, const char *path)
3236 {
3237 char concatpath[PATH_MAX];
3238 struct diff_filespec *one, *two;
3239
3240 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3241 unsigned tmp;
3242 const unsigned char *tmp_c;
3243 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3244 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3245 }
3246 if (!path) path = "";
3247 sprintf(concatpath, "%s%s", base, path);
3248 one = alloc_filespec(concatpath);
3249 two = alloc_filespec(concatpath);
3250 fill_filespec(one, old_sha1, old_mode);
3251 fill_filespec(two, new_sha1, new_mode);
3252
3253 diff_queue(&diff_queued_diff, one, two);
3254 DIFF_OPT_SET(options, HAS_CHANGES);
3255 }
3256
3257 void diff_unmerge(struct diff_options *options,
3258 const char *path,
3259 unsigned mode, const unsigned char *sha1)
3260 {
3261 struct diff_filespec *one, *two;
3262 one = alloc_filespec(path);
3263 two = alloc_filespec(path);
3264 fill_filespec(one, sha1, mode);
3265 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3266 }
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