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diff: load funcname patterns in "basic" config
[git/mjg.git] / diff.c
blob4a908b28af90e02e4eca8319c1ac51bb788a27c1
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 static const char *external_diff_cmd_cfg;
24 int diff_auto_refresh_index = 1;
25
26 static char diff_colors[][COLOR_MAXLEN] = {
27 "\033[m", /* reset */
28 "", /* PLAIN (normal) */
29 "\033[1m", /* METAINFO (bold) */
30 "\033[36m", /* FRAGINFO (cyan) */
31 "\033[31m", /* OLD (red) */
32 "\033[32m", /* NEW (green) */
33 "\033[33m", /* COMMIT (yellow) */
34 "\033[41m", /* WHITESPACE (red background) */
35 };
36
37 static int parse_diff_color_slot(const char *var, int ofs)
38 {
39 if (!strcasecmp(var+ofs, "plain"))
40 return DIFF_PLAIN;
41 if (!strcasecmp(var+ofs, "meta"))
42 return DIFF_METAINFO;
43 if (!strcasecmp(var+ofs, "frag"))
44 return DIFF_FRAGINFO;
45 if (!strcasecmp(var+ofs, "old"))
46 return DIFF_FILE_OLD;
47 if (!strcasecmp(var+ofs, "new"))
48 return DIFF_FILE_NEW;
49 if (!strcasecmp(var+ofs, "commit"))
50 return DIFF_COMMIT;
51 if (!strcasecmp(var+ofs, "whitespace"))
52 return DIFF_WHITESPACE;
53 die("bad config variable '%s'", var);
54 }
55
56 static struct ll_diff_driver {
57 const char *name;
58 struct ll_diff_driver *next;
59 char *cmd;
60 } *user_diff, **user_diff_tail;
61
62 static void read_config_if_needed(void)
63 {
64 if (!user_diff_tail) {
65 user_diff_tail = &user_diff;
66 git_config(git_diff_ui_config);
67 }
68 }
69
70 /*
71 * Currently there is only "diff.<drivername>.command" variable;
72 * because there are "diff.color.<slot>" variables, we are parsing
73 * this in a bit convoluted way to allow low level diff driver
74 * called "color".
75 */
76 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
77 {
78 const char *name;
79 int namelen;
80 struct ll_diff_driver *drv;
81
82 name = var + 5;
83 namelen = ep - name;
84 for (drv = user_diff; drv; drv = drv->next)
85 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
86 break;
87 if (!drv) {
88 drv = xcalloc(1, sizeof(struct ll_diff_driver));
89 drv->name = xmemdupz(name, namelen);
90 if (!user_diff_tail)
91 user_diff_tail = &user_diff;
92 *user_diff_tail = drv;
93 user_diff_tail = &(drv->next);
94 }
95
96 if (!value)
97 return error("%s: lacks value", var);
98 drv->cmd = strdup(value);
99 return 0;
100 }
101
102 /*
103 * 'diff.<what>.funcname' attribute can be specified in the configuration
104 * to define a customized regexp to find the beginning of a function to
105 * be used for hunk header lines of "diff -p" style output.
106 */
107 static struct funcname_pattern {
108 char *name;
109 char *pattern;
110 struct funcname_pattern *next;
111 } *funcname_pattern_list;
112
113 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
114 {
115 const char *name;
116 int namelen;
117 struct funcname_pattern *pp;
118
119 name = var + 5; /* "diff." */
120 namelen = ep - name;
121
122 for (pp = funcname_pattern_list; pp; pp = pp->next)
123 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
124 break;
125 if (!pp) {
126 pp = xcalloc(1, sizeof(*pp));
127 pp->name = xmemdupz(name, namelen);
128 pp->next = funcname_pattern_list;
129 funcname_pattern_list = pp;
130 }
131 if (pp->pattern)
132 free(pp->pattern);
133 pp->pattern = xstrdup(value);
134 return 0;
135 }
136
137 /*
138 * These are to give UI layer defaults.
139 * The core-level commands such as git-diff-files should
140 * never be affected by the setting of diff.renames
141 * the user happens to have in the configuration file.
142 */
143 int git_diff_ui_config(const char *var, const char *value)
144 {
145 if (!strcmp(var, "diff.renamelimit")) {
146 diff_rename_limit_default = git_config_int(var, value);
147 return 0;
148 }
149 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
150 diff_use_color_default = git_config_colorbool(var, value, -1);
151 return 0;
152 }
153 if (!strcmp(var, "diff.renames")) {
154 if (!value)
155 diff_detect_rename_default = DIFF_DETECT_RENAME;
156 else if (!strcasecmp(value, "copies") ||
157 !strcasecmp(value, "copy"))
158 diff_detect_rename_default = DIFF_DETECT_COPY;
159 else if (git_config_bool(var,value))
160 diff_detect_rename_default = DIFF_DETECT_RENAME;
161 return 0;
162 }
163 if (!strcmp(var, "diff.autorefreshindex")) {
164 diff_auto_refresh_index = git_config_bool(var, value);
165 return 0;
166 }
167 if (!strcmp(var, "diff.external")) {
168 external_diff_cmd_cfg = xstrdup(value);
169 return 0;
170 }
171 if (!prefixcmp(var, "diff.")) {
172 const char *ep = strrchr(var, '.');
173
174 if (ep != var + 4) {
175 if (!strcmp(ep, ".command"))
176 return parse_lldiff_command(var, ep, value);
177 }
178 }
179
180 return git_diff_basic_config(var, value);
181 }
182
183 int git_diff_basic_config(const char *var, const char *value)
184 {
185 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
186 int slot = parse_diff_color_slot(var, 11);
187 color_parse(value, var, diff_colors[slot]);
188 return 0;
189 }
190
191 if (!prefixcmp(var, "diff.")) {
192 const char *ep = strrchr(var, '.');
193 if (ep != var + 4) {
194 if (!strcmp(ep, ".funcname"))
195 return parse_funcname_pattern(var, ep, value);
196 }
197 }
198
199 return git_default_config(var, value);
200 }
201
202 static char *quote_two(const char *one, const char *two)
203 {
204 int need_one = quote_c_style(one, NULL, NULL, 1);
205 int need_two = quote_c_style(two, NULL, NULL, 1);
206 struct strbuf res;
207
208 strbuf_init(&res, 0);
209 if (need_one + need_two) {
210 strbuf_addch(&res, '"');
211 quote_c_style(one, &res, NULL, 1);
212 quote_c_style(two, &res, NULL, 1);
213 strbuf_addch(&res, '"');
214 } else {
215 strbuf_addstr(&res, one);
216 strbuf_addstr(&res, two);
217 }
218 return strbuf_detach(&res, NULL);
219 }
220
221 static const char *external_diff(void)
222 {
223 static const char *external_diff_cmd = NULL;
224 static int done_preparing = 0;
225
226 if (done_preparing)
227 return external_diff_cmd;
228 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
229 if (!external_diff_cmd)
230 external_diff_cmd = external_diff_cmd_cfg;
231 done_preparing = 1;
232 return external_diff_cmd;
233 }
234
235 static struct diff_tempfile {
236 const char *name; /* filename external diff should read from */
237 char hex[41];
238 char mode[10];
239 char tmp_path[PATH_MAX];
240 } diff_temp[2];
241
242 static int count_lines(const char *data, int size)
243 {
244 int count, ch, completely_empty = 1, nl_just_seen = 0;
245 count = 0;
246 while (0 < size--) {
247 ch = *data++;
248 if (ch == '\n') {
249 count++;
250 nl_just_seen = 1;
251 completely_empty = 0;
252 }
253 else {
254 nl_just_seen = 0;
255 completely_empty = 0;
256 }
257 }
258 if (completely_empty)
259 return 0;
260 if (!nl_just_seen)
261 count++; /* no trailing newline */
262 return count;
263 }
264
265 static void print_line_count(int count)
266 {
267 switch (count) {
268 case 0:
269 printf("0,0");
270 break;
271 case 1:
272 printf("1");
273 break;
274 default:
275 printf("1,%d", count);
276 break;
277 }
278 }
279
280 static void copy_file(int prefix, const char *data, int size,
281 const char *set, const char *reset)
282 {
283 int ch, nl_just_seen = 1;
284 while (0 < size--) {
285 ch = *data++;
286 if (nl_just_seen) {
287 fputs(set, stdout);
288 putchar(prefix);
289 }
290 if (ch == '\n') {
291 nl_just_seen = 1;
292 fputs(reset, stdout);
293 } else
294 nl_just_seen = 0;
295 putchar(ch);
296 }
297 if (!nl_just_seen)
298 printf("%s\n\\ No newline at end of file\n", reset);
299 }
300
301 static void emit_rewrite_diff(const char *name_a,
302 const char *name_b,
303 struct diff_filespec *one,
304 struct diff_filespec *two,
305 struct diff_options *o)
306 {
307 int lc_a, lc_b;
308 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
309 const char *name_a_tab, *name_b_tab;
310 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
311 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
312 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
313 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
314 const char *reset = diff_get_color(color_diff, DIFF_RESET);
315 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
316
317 name_a += (*name_a == '/');
318 name_b += (*name_b == '/');
319 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
320 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
321
322 strbuf_reset(&a_name);
323 strbuf_reset(&b_name);
324 quote_two_c_style(&a_name, o->a_prefix, name_a, 0);
325 quote_two_c_style(&b_name, o->b_prefix, name_b, 0);
326
327 diff_populate_filespec(one, 0);
328 diff_populate_filespec(two, 0);
329 lc_a = count_lines(one->data, one->size);
330 lc_b = count_lines(two->data, two->size);
331 printf("%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
332 metainfo, a_name.buf, name_a_tab, reset,
333 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
334 print_line_count(lc_a);
335 printf(" +");
336 print_line_count(lc_b);
337 printf(" @@%s\n", reset);
338 if (lc_a)
339 copy_file('-', one->data, one->size, old, reset);
340 if (lc_b)
341 copy_file('+', two->data, two->size, new, reset);
342 }
343
344 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
345 {
346 if (!DIFF_FILE_VALID(one)) {
347 mf->ptr = (char *)""; /* does not matter */
348 mf->size = 0;
349 return 0;
350 }
351 else if (diff_populate_filespec(one, 0))
352 return -1;
353 mf->ptr = one->data;
354 mf->size = one->size;
355 return 0;
356 }
357
358 struct diff_words_buffer {
359 mmfile_t text;
360 long alloc;
361 long current; /* output pointer */
362 int suppressed_newline;
363 };
364
365 static void diff_words_append(char *line, unsigned long len,
366 struct diff_words_buffer *buffer)
367 {
368 if (buffer->text.size + len > buffer->alloc) {
369 buffer->alloc = (buffer->text.size + len) * 3 / 2;
370 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
371 }
372 line++;
373 len--;
374 memcpy(buffer->text.ptr + buffer->text.size, line, len);
375 buffer->text.size += len;
376 }
377
378 struct diff_words_data {
379 struct xdiff_emit_state xm;
380 struct diff_words_buffer minus, plus;
381 };
382
383 static void print_word(struct diff_words_buffer *buffer, int len, int color,
384 int suppress_newline)
385 {
386 const char *ptr;
387 int eol = 0;
388
389 if (len == 0)
390 return;
391
392 ptr = buffer->text.ptr + buffer->current;
393 buffer->current += len;
394
395 if (ptr[len - 1] == '\n') {
396 eol = 1;
397 len--;
398 }
399
400 fputs(diff_get_color(1, color), stdout);
401 fwrite(ptr, len, 1, stdout);
402 fputs(diff_get_color(1, DIFF_RESET), stdout);
403
404 if (eol) {
405 if (suppress_newline)
406 buffer->suppressed_newline = 1;
407 else
408 putchar('\n');
409 }
410 }
411
412 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
413 {
414 struct diff_words_data *diff_words = priv;
415
416 if (diff_words->minus.suppressed_newline) {
417 if (line[0] != '+')
418 putchar('\n');
419 diff_words->minus.suppressed_newline = 0;
420 }
421
422 len--;
423 switch (line[0]) {
424 case '-':
425 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
426 break;
427 case '+':
428 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
429 break;
430 case ' ':
431 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
432 diff_words->minus.current += len;
433 break;
434 }
435 }
436
437 /* this executes the word diff on the accumulated buffers */
438 static void diff_words_show(struct diff_words_data *diff_words)
439 {
440 xpparam_t xpp;
441 xdemitconf_t xecfg;
442 xdemitcb_t ecb;
443 mmfile_t minus, plus;
444 int i;
445
446 memset(&xecfg, 0, sizeof(xecfg));
447 minus.size = diff_words->minus.text.size;
448 minus.ptr = xmalloc(minus.size);
449 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
450 for (i = 0; i < minus.size; i++)
451 if (isspace(minus.ptr[i]))
452 minus.ptr[i] = '\n';
453 diff_words->minus.current = 0;
454
455 plus.size = diff_words->plus.text.size;
456 plus.ptr = xmalloc(plus.size);
457 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
458 for (i = 0; i < plus.size; i++)
459 if (isspace(plus.ptr[i]))
460 plus.ptr[i] = '\n';
461 diff_words->plus.current = 0;
462
463 xpp.flags = XDF_NEED_MINIMAL;
464 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
465 ecb.outf = xdiff_outf;
466 ecb.priv = diff_words;
467 diff_words->xm.consume = fn_out_diff_words_aux;
468 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
469
470 free(minus.ptr);
471 free(plus.ptr);
472 diff_words->minus.text.size = diff_words->plus.text.size = 0;
473
474 if (diff_words->minus.suppressed_newline) {
475 putchar('\n');
476 diff_words->minus.suppressed_newline = 0;
477 }
478 }
479
480 struct emit_callback {
481 struct xdiff_emit_state xm;
482 int nparents, color_diff;
483 unsigned ws_rule;
484 const char **label_path;
485 struct diff_words_data *diff_words;
486 int *found_changesp;
487 };
488
489 static void free_diff_words_data(struct emit_callback *ecbdata)
490 {
491 if (ecbdata->diff_words) {
492 /* flush buffers */
493 if (ecbdata->diff_words->minus.text.size ||
494 ecbdata->diff_words->plus.text.size)
495 diff_words_show(ecbdata->diff_words);
496
497 if (ecbdata->diff_words->minus.text.ptr)
498 free (ecbdata->diff_words->minus.text.ptr);
499 if (ecbdata->diff_words->plus.text.ptr)
500 free (ecbdata->diff_words->plus.text.ptr);
501 free(ecbdata->diff_words);
502 ecbdata->diff_words = NULL;
503 }
504 }
505
506 const char *diff_get_color(int diff_use_color, enum color_diff ix)
507 {
508 if (diff_use_color)
509 return diff_colors[ix];
510 return "";
511 }
512
513 static void emit_line(const char *set, const char *reset, const char *line, int len)
514 {
515 fputs(set, stdout);
516 fwrite(line, len, 1, stdout);
517 fputs(reset, stdout);
518 }
519
520 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
521 {
522 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
523 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
524
525 if (!*ws)
526 emit_line(set, reset, line, len);
527 else {
528 /* Emit just the prefix, then the rest. */
529 emit_line(set, reset, line, ecbdata->nparents);
530 (void)check_and_emit_line(line + ecbdata->nparents,
531 len - ecbdata->nparents, ecbdata->ws_rule,
532 stdout, set, reset, ws);
533 }
534 }
535
536 static void fn_out_consume(void *priv, char *line, unsigned long len)
537 {
538 int i;
539 int color;
540 struct emit_callback *ecbdata = priv;
541 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
542 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
543
544 *(ecbdata->found_changesp) = 1;
545
546 if (ecbdata->label_path[0]) {
547 const char *name_a_tab, *name_b_tab;
548
549 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
550 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
551
552 printf("%s--- %s%s%s\n",
553 set, ecbdata->label_path[0], reset, name_a_tab);
554 printf("%s+++ %s%s%s\n",
555 set, ecbdata->label_path[1], reset, name_b_tab);
556 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
557 }
558
559 /* This is not really necessary for now because
560 * this codepath only deals with two-way diffs.
561 */
562 for (i = 0; i < len && line[i] == '@'; i++)
563 ;
564 if (2 <= i && i < len && line[i] == ' ') {
565 ecbdata->nparents = i - 1;
566 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
567 reset, line, len);
568 return;
569 }
570
571 if (len < ecbdata->nparents) {
572 set = reset;
573 emit_line(reset, reset, line, len);
574 return;
575 }
576
577 color = DIFF_PLAIN;
578 if (ecbdata->diff_words && ecbdata->nparents != 1)
579 /* fall back to normal diff */
580 free_diff_words_data(ecbdata);
581 if (ecbdata->diff_words) {
582 if (line[0] == '-') {
583 diff_words_append(line, len,
584 &ecbdata->diff_words->minus);
585 return;
586 } else if (line[0] == '+') {
587 diff_words_append(line, len,
588 &ecbdata->diff_words->plus);
589 return;
590 }
591 if (ecbdata->diff_words->minus.text.size ||
592 ecbdata->diff_words->plus.text.size)
593 diff_words_show(ecbdata->diff_words);
594 line++;
595 len--;
596 emit_line(set, reset, line, len);
597 return;
598 }
599 for (i = 0; i < ecbdata->nparents && len; i++) {
600 if (line[i] == '-')
601 color = DIFF_FILE_OLD;
602 else if (line[i] == '+')
603 color = DIFF_FILE_NEW;
604 }
605
606 if (color != DIFF_FILE_NEW) {
607 emit_line(diff_get_color(ecbdata->color_diff, color),
608 reset, line, len);
609 return;
610 }
611 emit_add_line(reset, ecbdata, line, len);
612 }
613
614 static char *pprint_rename(const char *a, const char *b)
615 {
616 const char *old = a;
617 const char *new = b;
618 struct strbuf name;
619 int pfx_length, sfx_length;
620 int len_a = strlen(a);
621 int len_b = strlen(b);
622 int a_midlen, b_midlen;
623 int qlen_a = quote_c_style(a, NULL, NULL, 0);
624 int qlen_b = quote_c_style(b, NULL, NULL, 0);
625
626 strbuf_init(&name, 0);
627 if (qlen_a || qlen_b) {
628 quote_c_style(a, &name, NULL, 0);
629 strbuf_addstr(&name, " => ");
630 quote_c_style(b, &name, NULL, 0);
631 return strbuf_detach(&name, NULL);
632 }
633
634 /* Find common prefix */
635 pfx_length = 0;
636 while (*old && *new && *old == *new) {
637 if (*old == '/')
638 pfx_length = old - a + 1;
639 old++;
640 new++;
641 }
642
643 /* Find common suffix */
644 old = a + len_a;
645 new = b + len_b;
646 sfx_length = 0;
647 while (a <= old && b <= new && *old == *new) {
648 if (*old == '/')
649 sfx_length = len_a - (old - a);
650 old--;
651 new--;
652 }
653
654 /*
655 * pfx{mid-a => mid-b}sfx
656 * {pfx-a => pfx-b}sfx
657 * pfx{sfx-a => sfx-b}
658 * name-a => name-b
659 */
660 a_midlen = len_a - pfx_length - sfx_length;
661 b_midlen = len_b - pfx_length - sfx_length;
662 if (a_midlen < 0)
663 a_midlen = 0;
664 if (b_midlen < 0)
665 b_midlen = 0;
666
667 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
668 if (pfx_length + sfx_length) {
669 strbuf_add(&name, a, pfx_length);
670 strbuf_addch(&name, '{');
671 }
672 strbuf_add(&name, a + pfx_length, a_midlen);
673 strbuf_addstr(&name, " => ");
674 strbuf_add(&name, b + pfx_length, b_midlen);
675 if (pfx_length + sfx_length) {
676 strbuf_addch(&name, '}');
677 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
678 }
679 return strbuf_detach(&name, NULL);
680 }
681
682 struct diffstat_t {
683 struct xdiff_emit_state xm;
684
685 int nr;
686 int alloc;
687 struct diffstat_file {
688 char *from_name;
689 char *name;
690 char *print_name;
691 unsigned is_unmerged:1;
692 unsigned is_binary:1;
693 unsigned is_renamed:1;
694 unsigned int added, deleted;
695 } **files;
696 };
697
698 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
699 const char *name_a,
700 const char *name_b)
701 {
702 struct diffstat_file *x;
703 x = xcalloc(sizeof (*x), 1);
704 if (diffstat->nr == diffstat->alloc) {
705 diffstat->alloc = alloc_nr(diffstat->alloc);
706 diffstat->files = xrealloc(diffstat->files,
707 diffstat->alloc * sizeof(x));
708 }
709 diffstat->files[diffstat->nr++] = x;
710 if (name_b) {
711 x->from_name = xstrdup(name_a);
712 x->name = xstrdup(name_b);
713 x->is_renamed = 1;
714 }
715 else {
716 x->from_name = NULL;
717 x->name = xstrdup(name_a);
718 }
719 return x;
720 }
721
722 static void diffstat_consume(void *priv, char *line, unsigned long len)
723 {
724 struct diffstat_t *diffstat = priv;
725 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
726
727 if (line[0] == '+')
728 x->added++;
729 else if (line[0] == '-')
730 x->deleted++;
731 }
732
733 const char mime_boundary_leader[] = "------------";
734
735 static int scale_linear(int it, int width, int max_change)
736 {
737 /*
738 * make sure that at least one '-' is printed if there were deletions,
739 * and likewise for '+'.
740 */
741 if (max_change < 2)
742 return it;
743 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
744 }
745
746 static void show_name(const char *prefix, const char *name, int len,
747 const char *reset, const char *set)
748 {
749 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
750 }
751
752 static void show_graph(char ch, int cnt, const char *set, const char *reset)
753 {
754 if (cnt <= 0)
755 return;
756 printf("%s", set);
757 while (cnt--)
758 putchar(ch);
759 printf("%s", reset);
760 }
761
762 static void fill_print_name(struct diffstat_file *file)
763 {
764 char *pname;
765
766 if (file->print_name)
767 return;
768
769 if (!file->is_renamed) {
770 struct strbuf buf;
771 strbuf_init(&buf, 0);
772 if (quote_c_style(file->name, &buf, NULL, 0)) {
773 pname = strbuf_detach(&buf, NULL);
774 } else {
775 pname = file->name;
776 strbuf_release(&buf);
777 }
778 } else {
779 pname = pprint_rename(file->from_name, file->name);
780 }
781 file->print_name = pname;
782 }
783
784 static void show_stats(struct diffstat_t* data, struct diff_options *options)
785 {
786 int i, len, add, del, total, adds = 0, dels = 0;
787 int max_change = 0, max_len = 0;
788 int total_files = data->nr;
789 int width, name_width;
790 const char *reset, *set, *add_c, *del_c;
791
792 if (data->nr == 0)
793 return;
794
795 width = options->stat_width ? options->stat_width : 80;
796 name_width = options->stat_name_width ? options->stat_name_width : 50;
797
798 /* Sanity: give at least 5 columns to the graph,
799 * but leave at least 10 columns for the name.
800 */
801 if (width < name_width + 15) {
802 if (name_width <= 25)
803 width = name_width + 15;
804 else
805 name_width = width - 15;
806 }
807
808 /* Find the longest filename and max number of changes */
809 reset = diff_get_color_opt(options, DIFF_RESET);
810 set = diff_get_color_opt(options, DIFF_PLAIN);
811 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
812 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
813
814 for (i = 0; i < data->nr; i++) {
815 struct diffstat_file *file = data->files[i];
816 int change = file->added + file->deleted;
817 fill_print_name(file);
818 len = strlen(file->print_name);
819 if (max_len < len)
820 max_len = len;
821
822 if (file->is_binary || file->is_unmerged)
823 continue;
824 if (max_change < change)
825 max_change = change;
826 }
827
828 /* Compute the width of the graph part;
829 * 10 is for one blank at the beginning of the line plus
830 * " | count " between the name and the graph.
831 *
832 * From here on, name_width is the width of the name area,
833 * and width is the width of the graph area.
834 */
835 name_width = (name_width < max_len) ? name_width : max_len;
836 if (width < (name_width + 10) + max_change)
837 width = width - (name_width + 10);
838 else
839 width = max_change;
840
841 for (i = 0; i < data->nr; i++) {
842 const char *prefix = "";
843 char *name = data->files[i]->print_name;
844 int added = data->files[i]->added;
845 int deleted = data->files[i]->deleted;
846 int name_len;
847
848 /*
849 * "scale" the filename
850 */
851 len = name_width;
852 name_len = strlen(name);
853 if (name_width < name_len) {
854 char *slash;
855 prefix = "...";
856 len -= 3;
857 name += name_len - len;
858 slash = strchr(name, '/');
859 if (slash)
860 name = slash;
861 }
862
863 if (data->files[i]->is_binary) {
864 show_name(prefix, name, len, reset, set);
865 printf(" Bin ");
866 printf("%s%d%s", del_c, deleted, reset);
867 printf(" -> ");
868 printf("%s%d%s", add_c, added, reset);
869 printf(" bytes");
870 printf("\n");
871 continue;
872 }
873 else if (data->files[i]->is_unmerged) {
874 show_name(prefix, name, len, reset, set);
875 printf(" Unmerged\n");
876 continue;
877 }
878 else if (!data->files[i]->is_renamed &&
879 (added + deleted == 0)) {
880 total_files--;
881 continue;
882 }
883
884 /*
885 * scale the add/delete
886 */
887 add = added;
888 del = deleted;
889 total = add + del;
890 adds += add;
891 dels += del;
892
893 if (width <= max_change) {
894 add = scale_linear(add, width, max_change);
895 del = scale_linear(del, width, max_change);
896 total = add + del;
897 }
898 show_name(prefix, name, len, reset, set);
899 printf("%5d ", added + deleted);
900 show_graph('+', add, add_c, reset);
901 show_graph('-', del, del_c, reset);
902 putchar('\n');
903 }
904 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
905 set, total_files, adds, dels, reset);
906 }
907
908 static void show_shortstats(struct diffstat_t* data)
909 {
910 int i, adds = 0, dels = 0, total_files = data->nr;
911
912 if (data->nr == 0)
913 return;
914
915 for (i = 0; i < data->nr; i++) {
916 if (!data->files[i]->is_binary &&
917 !data->files[i]->is_unmerged) {
918 int added = data->files[i]->added;
919 int deleted= data->files[i]->deleted;
920 if (!data->files[i]->is_renamed &&
921 (added + deleted == 0)) {
922 total_files--;
923 } else {
924 adds += added;
925 dels += deleted;
926 }
927 }
928 }
929 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
930 total_files, adds, dels);
931 }
932
933 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
934 {
935 int i;
936
937 if (data->nr == 0)
938 return;
939
940 for (i = 0; i < data->nr; i++) {
941 struct diffstat_file *file = data->files[i];
942
943 if (file->is_binary)
944 printf("-\t-\t");
945 else
946 printf("%d\t%d\t", file->added, file->deleted);
947 if (options->line_termination) {
948 fill_print_name(file);
949 if (!file->is_renamed)
950 write_name_quoted(file->name, stdout,
951 options->line_termination);
952 else {
953 fputs(file->print_name, stdout);
954 putchar(options->line_termination);
955 }
956 } else {
957 if (file->is_renamed) {
958 putchar('\0');
959 write_name_quoted(file->from_name, stdout, '\0');
960 }
961 write_name_quoted(file->name, stdout, '\0');
962 }
963 }
964 }
965
966 static void free_diffstat_info(struct diffstat_t *diffstat)
967 {
968 int i;
969 for (i = 0; i < diffstat->nr; i++) {
970 struct diffstat_file *f = diffstat->files[i];
971 if (f->name != f->print_name)
972 free(f->print_name);
973 free(f->name);
974 free(f->from_name);
975 free(f);
976 }
977 free(diffstat->files);
978 }
979
980 struct checkdiff_t {
981 struct xdiff_emit_state xm;
982 const char *filename;
983 int lineno, color_diff;
984 unsigned ws_rule;
985 unsigned status;
986 };
987
988 static void checkdiff_consume(void *priv, char *line, unsigned long len)
989 {
990 struct checkdiff_t *data = priv;
991 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
992 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
993 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
994 char *err;
995
996 if (line[0] == '+') {
997 data->status = check_and_emit_line(line + 1, len - 1,
998 data->ws_rule, NULL, NULL, NULL, NULL);
999 if (!data->status)
1000 return;
1001 err = whitespace_error_string(data->status);
1002 printf("%s:%d: %s.\n", data->filename, data->lineno, err);
1003 free(err);
1004 emit_line(set, reset, line, 1);
1005 (void)check_and_emit_line(line + 1, len - 1, data->ws_rule,
1006 stdout, set, reset, ws);
1007 data->lineno++;
1008 } else if (line[0] == ' ')
1009 data->lineno++;
1010 else if (line[0] == '@') {
1011 char *plus = strchr(line, '+');
1012 if (plus)
1013 data->lineno = strtol(plus, NULL, 10);
1014 else
1015 die("invalid diff");
1016 }
1017 }
1018
1019 static unsigned char *deflate_it(char *data,
1020 unsigned long size,
1021 unsigned long *result_size)
1022 {
1023 int bound;
1024 unsigned char *deflated;
1025 z_stream stream;
1026
1027 memset(&stream, 0, sizeof(stream));
1028 deflateInit(&stream, zlib_compression_level);
1029 bound = deflateBound(&stream, size);
1030 deflated = xmalloc(bound);
1031 stream.next_out = deflated;
1032 stream.avail_out = bound;
1033
1034 stream.next_in = (unsigned char *)data;
1035 stream.avail_in = size;
1036 while (deflate(&stream, Z_FINISH) == Z_OK)
1037 ; /* nothing */
1038 deflateEnd(&stream);
1039 *result_size = stream.total_out;
1040 return deflated;
1041 }
1042
1043 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1044 {
1045 void *cp;
1046 void *delta;
1047 void *deflated;
1048 void *data;
1049 unsigned long orig_size;
1050 unsigned long delta_size;
1051 unsigned long deflate_size;
1052 unsigned long data_size;
1053
1054 /* We could do deflated delta, or we could do just deflated two,
1055 * whichever is smaller.
1056 */
1057 delta = NULL;
1058 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1059 if (one->size && two->size) {
1060 delta = diff_delta(one->ptr, one->size,
1061 two->ptr, two->size,
1062 &delta_size, deflate_size);
1063 if (delta) {
1064 void *to_free = delta;
1065 orig_size = delta_size;
1066 delta = deflate_it(delta, delta_size, &delta_size);
1067 free(to_free);
1068 }
1069 }
1070
1071 if (delta && delta_size < deflate_size) {
1072 printf("delta %lu\n", orig_size);
1073 free(deflated);
1074 data = delta;
1075 data_size = delta_size;
1076 }
1077 else {
1078 printf("literal %lu\n", two->size);
1079 free(delta);
1080 data = deflated;
1081 data_size = deflate_size;
1082 }
1083
1084 /* emit data encoded in base85 */
1085 cp = data;
1086 while (data_size) {
1087 int bytes = (52 < data_size) ? 52 : data_size;
1088 char line[70];
1089 data_size -= bytes;
1090 if (bytes <= 26)
1091 line[0] = bytes + 'A' - 1;
1092 else
1093 line[0] = bytes - 26 + 'a' - 1;
1094 encode_85(line + 1, cp, bytes);
1095 cp = (char *) cp + bytes;
1096 puts(line);
1097 }
1098 printf("\n");
1099 free(data);
1100 }
1101
1102 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1103 {
1104 printf("GIT binary patch\n");
1105 emit_binary_diff_body(one, two);
1106 emit_binary_diff_body(two, one);
1107 }
1108
1109 static void setup_diff_attr_check(struct git_attr_check *check)
1110 {
1111 static struct git_attr *attr_diff;
1112
1113 if (!attr_diff) {
1114 attr_diff = git_attr("diff", 4);
1115 }
1116 check[0].attr = attr_diff;
1117 }
1118
1119 static void diff_filespec_check_attr(struct diff_filespec *one)
1120 {
1121 struct git_attr_check attr_diff_check;
1122 int check_from_data = 0;
1123
1124 if (one->checked_attr)
1125 return;
1126
1127 setup_diff_attr_check(&attr_diff_check);
1128 one->is_binary = 0;
1129 one->funcname_pattern_ident = NULL;
1130
1131 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1132 const char *value;
1133
1134 /* binaryness */
1135 value = attr_diff_check.value;
1136 if (ATTR_TRUE(value))
1137 ;
1138 else if (ATTR_FALSE(value))
1139 one->is_binary = 1;
1140 else
1141 check_from_data = 1;
1142
1143 /* funcname pattern ident */
1144 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1145 ;
1146 else
1147 one->funcname_pattern_ident = value;
1148 }
1149
1150 if (check_from_data) {
1151 if (!one->data && DIFF_FILE_VALID(one))
1152 diff_populate_filespec(one, 0);
1153
1154 if (one->data)
1155 one->is_binary = buffer_is_binary(one->data, one->size);
1156 }
1157 }
1158
1159 int diff_filespec_is_binary(struct diff_filespec *one)
1160 {
1161 diff_filespec_check_attr(one);
1162 return one->is_binary;
1163 }
1164
1165 static const char *funcname_pattern(const char *ident)
1166 {
1167 struct funcname_pattern *pp;
1168
1169 for (pp = funcname_pattern_list; pp; pp = pp->next)
1170 if (!strcmp(ident, pp->name))
1171 return pp->pattern;
1172 return NULL;
1173 }
1174
1175 static struct builtin_funcname_pattern {
1176 const char *name;
1177 const char *pattern;
1178 } builtin_funcname_pattern[] = {
1179 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1180 "new\\|return\\|switch\\|throw\\|while\\)\n"
1181 "^[ ]*\\(\\([ ]*"
1182 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1183 "[ ]*([^;]*$\\)" },
1184 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1185 };
1186
1187 static const char *diff_funcname_pattern(struct diff_filespec *one)
1188 {
1189 const char *ident, *pattern;
1190 int i;
1191
1192 diff_filespec_check_attr(one);
1193 ident = one->funcname_pattern_ident;
1194
1195 if (!ident)
1196 /*
1197 * If the config file has "funcname.default" defined, that
1198 * regexp is used; otherwise NULL is returned and xemit uses
1199 * the built-in default.
1200 */
1201 return funcname_pattern("default");
1202
1203 /* Look up custom "funcname.$ident" regexp from config. */
1204 pattern = funcname_pattern(ident);
1205 if (pattern)
1206 return pattern;
1207
1208 /*
1209 * And define built-in fallback patterns here. Note that
1210 * these can be overriden by the user's config settings.
1211 */
1212 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1213 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1214 return builtin_funcname_pattern[i].pattern;
1215
1216 return NULL;
1217 }
1218
1219 static void builtin_diff(const char *name_a,
1220 const char *name_b,
1221 struct diff_filespec *one,
1222 struct diff_filespec *two,
1223 const char *xfrm_msg,
1224 struct diff_options *o,
1225 int complete_rewrite)
1226 {
1227 mmfile_t mf1, mf2;
1228 const char *lbl[2];
1229 char *a_one, *b_two;
1230 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1231 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1232
1233 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1234 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
1235 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1236 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1237 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1238 if (lbl[0][0] == '/') {
1239 /* /dev/null */
1240 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1241 if (xfrm_msg && xfrm_msg[0])
1242 printf("%s%s%s\n", set, xfrm_msg, reset);
1243 }
1244 else if (lbl[1][0] == '/') {
1245 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1246 if (xfrm_msg && xfrm_msg[0])
1247 printf("%s%s%s\n", set, xfrm_msg, reset);
1248 }
1249 else {
1250 if (one->mode != two->mode) {
1251 printf("%sold mode %06o%s\n", set, one->mode, reset);
1252 printf("%snew mode %06o%s\n", set, two->mode, reset);
1253 }
1254 if (xfrm_msg && xfrm_msg[0])
1255 printf("%s%s%s\n", set, xfrm_msg, reset);
1256 /*
1257 * we do not run diff between different kind
1258 * of objects.
1259 */
1260 if ((one->mode ^ two->mode) & S_IFMT)
1261 goto free_ab_and_return;
1262 if (complete_rewrite) {
1263 emit_rewrite_diff(name_a, name_b, one, two, o);
1264 o->found_changes = 1;
1265 goto free_ab_and_return;
1266 }
1267 }
1268
1269 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1270 die("unable to read files to diff");
1271
1272 if (!DIFF_OPT_TST(o, TEXT) &&
1273 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1274 /* Quite common confusing case */
1275 if (mf1.size == mf2.size &&
1276 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1277 goto free_ab_and_return;
1278 if (DIFF_OPT_TST(o, BINARY))
1279 emit_binary_diff(&mf1, &mf2);
1280 else
1281 printf("Binary files %s and %s differ\n",
1282 lbl[0], lbl[1]);
1283 o->found_changes = 1;
1284 }
1285 else {
1286 /* Crazy xdl interfaces.. */
1287 const char *diffopts = getenv("GIT_DIFF_OPTS");
1288 xpparam_t xpp;
1289 xdemitconf_t xecfg;
1290 xdemitcb_t ecb;
1291 struct emit_callback ecbdata;
1292 const char *funcname_pattern;
1293
1294 funcname_pattern = diff_funcname_pattern(one);
1295 if (!funcname_pattern)
1296 funcname_pattern = diff_funcname_pattern(two);
1297
1298 memset(&xecfg, 0, sizeof(xecfg));
1299 memset(&ecbdata, 0, sizeof(ecbdata));
1300 ecbdata.label_path = lbl;
1301 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1302 ecbdata.found_changesp = &o->found_changes;
1303 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1304 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1305 xecfg.ctxlen = o->context;
1306 xecfg.flags = XDL_EMIT_FUNCNAMES;
1307 if (funcname_pattern)
1308 xdiff_set_find_func(&xecfg, funcname_pattern);
1309 if (!diffopts)
1310 ;
1311 else if (!prefixcmp(diffopts, "--unified="))
1312 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1313 else if (!prefixcmp(diffopts, "-u"))
1314 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1315 ecb.outf = xdiff_outf;
1316 ecb.priv = &ecbdata;
1317 ecbdata.xm.consume = fn_out_consume;
1318 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1319 ecbdata.diff_words =
1320 xcalloc(1, sizeof(struct diff_words_data));
1321 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1322 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1323 free_diff_words_data(&ecbdata);
1324 }
1325
1326 free_ab_and_return:
1327 diff_free_filespec_data(one);
1328 diff_free_filespec_data(two);
1329 free(a_one);
1330 free(b_two);
1331 return;
1332 }
1333
1334 static void builtin_diffstat(const char *name_a, const char *name_b,
1335 struct diff_filespec *one,
1336 struct diff_filespec *two,
1337 struct diffstat_t *diffstat,
1338 struct diff_options *o,
1339 int complete_rewrite)
1340 {
1341 mmfile_t mf1, mf2;
1342 struct diffstat_file *data;
1343
1344 data = diffstat_add(diffstat, name_a, name_b);
1345
1346 if (!one || !two) {
1347 data->is_unmerged = 1;
1348 return;
1349 }
1350 if (complete_rewrite) {
1351 diff_populate_filespec(one, 0);
1352 diff_populate_filespec(two, 0);
1353 data->deleted = count_lines(one->data, one->size);
1354 data->added = count_lines(two->data, two->size);
1355 goto free_and_return;
1356 }
1357 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1358 die("unable to read files to diff");
1359
1360 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1361 data->is_binary = 1;
1362 data->added = mf2.size;
1363 data->deleted = mf1.size;
1364 } else {
1365 /* Crazy xdl interfaces.. */
1366 xpparam_t xpp;
1367 xdemitconf_t xecfg;
1368 xdemitcb_t ecb;
1369
1370 memset(&xecfg, 0, sizeof(xecfg));
1371 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1372 ecb.outf = xdiff_outf;
1373 ecb.priv = diffstat;
1374 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1375 }
1376
1377 free_and_return:
1378 diff_free_filespec_data(one);
1379 diff_free_filespec_data(two);
1380 }
1381
1382 static void builtin_checkdiff(const char *name_a, const char *name_b,
1383 struct diff_filespec *one,
1384 struct diff_filespec *two, struct diff_options *o)
1385 {
1386 mmfile_t mf1, mf2;
1387 struct checkdiff_t data;
1388
1389 if (!two)
1390 return;
1391
1392 memset(&data, 0, sizeof(data));
1393 data.xm.consume = checkdiff_consume;
1394 data.filename = name_b ? name_b : name_a;
1395 data.lineno = 0;
1396 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1397 data.ws_rule = whitespace_rule(data.filename);
1398
1399 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1400 die("unable to read files to diff");
1401
1402 if (diff_filespec_is_binary(two))
1403 goto free_and_return;
1404 else {
1405 /* Crazy xdl interfaces.. */
1406 xpparam_t xpp;
1407 xdemitconf_t xecfg;
1408 xdemitcb_t ecb;
1409
1410 memset(&xecfg, 0, sizeof(xecfg));
1411 xpp.flags = XDF_NEED_MINIMAL;
1412 ecb.outf = xdiff_outf;
1413 ecb.priv = &data;
1414 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1415 }
1416 free_and_return:
1417 diff_free_filespec_data(one);
1418 diff_free_filespec_data(two);
1419 if (data.status)
1420 DIFF_OPT_SET(o, CHECK_FAILED);
1421 }
1422
1423 struct diff_filespec *alloc_filespec(const char *path)
1424 {
1425 int namelen = strlen(path);
1426 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1427
1428 memset(spec, 0, sizeof(*spec));
1429 spec->path = (char *)(spec + 1);
1430 memcpy(spec->path, path, namelen+1);
1431 spec->count = 1;
1432 return spec;
1433 }
1434
1435 void free_filespec(struct diff_filespec *spec)
1436 {
1437 if (!--spec->count) {
1438 diff_free_filespec_data(spec);
1439 free(spec);
1440 }
1441 }
1442
1443 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1444 unsigned short mode)
1445 {
1446 if (mode) {
1447 spec->mode = canon_mode(mode);
1448 hashcpy(spec->sha1, sha1);
1449 spec->sha1_valid = !is_null_sha1(sha1);
1450 }
1451 }
1452
1453 /*
1454 * Given a name and sha1 pair, if the index tells us the file in
1455 * the work tree has that object contents, return true, so that
1456 * prepare_temp_file() does not have to inflate and extract.
1457 */
1458 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1459 {
1460 struct cache_entry *ce;
1461 struct stat st;
1462 int pos, len;
1463
1464 /* We do not read the cache ourselves here, because the
1465 * benchmark with my previous version that always reads cache
1466 * shows that it makes things worse for diff-tree comparing
1467 * two linux-2.6 kernel trees in an already checked out work
1468 * tree. This is because most diff-tree comparisons deal with
1469 * only a small number of files, while reading the cache is
1470 * expensive for a large project, and its cost outweighs the
1471 * savings we get by not inflating the object to a temporary
1472 * file. Practically, this code only helps when we are used
1473 * by diff-cache --cached, which does read the cache before
1474 * calling us.
1475 */
1476 if (!active_cache)
1477 return 0;
1478
1479 /* We want to avoid the working directory if our caller
1480 * doesn't need the data in a normal file, this system
1481 * is rather slow with its stat/open/mmap/close syscalls,
1482 * and the object is contained in a pack file. The pack
1483 * is probably already open and will be faster to obtain
1484 * the data through than the working directory. Loose
1485 * objects however would tend to be slower as they need
1486 * to be individually opened and inflated.
1487 */
1488 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1489 return 0;
1490
1491 len = strlen(name);
1492 pos = cache_name_pos(name, len);
1493 if (pos < 0)
1494 return 0;
1495 ce = active_cache[pos];
1496 if ((lstat(name, &st) < 0) ||
1497 !S_ISREG(st.st_mode) || /* careful! */
1498 ce_match_stat(ce, &st, 0) ||
1499 hashcmp(sha1, ce->sha1))
1500 return 0;
1501 /* we return 1 only when we can stat, it is a regular file,
1502 * stat information matches, and sha1 recorded in the cache
1503 * matches. I.e. we know the file in the work tree really is
1504 * the same as the <name, sha1> pair.
1505 */
1506 return 1;
1507 }
1508
1509 static int populate_from_stdin(struct diff_filespec *s)
1510 {
1511 struct strbuf buf;
1512 size_t size = 0;
1513
1514 strbuf_init(&buf, 0);
1515 if (strbuf_read(&buf, 0, 0) < 0)
1516 return error("error while reading from stdin %s",
1517 strerror(errno));
1518
1519 s->should_munmap = 0;
1520 s->data = strbuf_detach(&buf, &size);
1521 s->size = size;
1522 s->should_free = 1;
1523 return 0;
1524 }
1525
1526 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1527 {
1528 int len;
1529 char *data = xmalloc(100);
1530 len = snprintf(data, 100,
1531 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1532 s->data = data;
1533 s->size = len;
1534 s->should_free = 1;
1535 if (size_only) {
1536 s->data = NULL;
1537 free(data);
1538 }
1539 return 0;
1540 }
1541
1542 /*
1543 * While doing rename detection and pickaxe operation, we may need to
1544 * grab the data for the blob (or file) for our own in-core comparison.
1545 * diff_filespec has data and size fields for this purpose.
1546 */
1547 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1548 {
1549 int err = 0;
1550 if (!DIFF_FILE_VALID(s))
1551 die("internal error: asking to populate invalid file.");
1552 if (S_ISDIR(s->mode))
1553 return -1;
1554
1555 if (s->data)
1556 return 0;
1557
1558 if (size_only && 0 < s->size)
1559 return 0;
1560
1561 if (S_ISGITLINK(s->mode))
1562 return diff_populate_gitlink(s, size_only);
1563
1564 if (!s->sha1_valid ||
1565 reuse_worktree_file(s->path, s->sha1, 0)) {
1566 struct strbuf buf;
1567 struct stat st;
1568 int fd;
1569
1570 if (!strcmp(s->path, "-"))
1571 return populate_from_stdin(s);
1572
1573 if (lstat(s->path, &st) < 0) {
1574 if (errno == ENOENT) {
1575 err_empty:
1576 err = -1;
1577 empty:
1578 s->data = (char *)"";
1579 s->size = 0;
1580 return err;
1581 }
1582 }
1583 s->size = xsize_t(st.st_size);
1584 if (!s->size)
1585 goto empty;
1586 if (size_only)
1587 return 0;
1588 if (S_ISLNK(st.st_mode)) {
1589 int ret;
1590 s->data = xmalloc(s->size);
1591 s->should_free = 1;
1592 ret = readlink(s->path, s->data, s->size);
1593 if (ret < 0) {
1594 free(s->data);
1595 goto err_empty;
1596 }
1597 return 0;
1598 }
1599 fd = open(s->path, O_RDONLY);
1600 if (fd < 0)
1601 goto err_empty;
1602 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1603 close(fd);
1604 s->should_munmap = 1;
1605
1606 /*
1607 * Convert from working tree format to canonical git format
1608 */
1609 strbuf_init(&buf, 0);
1610 if (convert_to_git(s->path, s->data, s->size, &buf)) {
1611 size_t size = 0;
1612 munmap(s->data, s->size);
1613 s->should_munmap = 0;
1614 s->data = strbuf_detach(&buf, &size);
1615 s->size = size;
1616 s->should_free = 1;
1617 }
1618 }
1619 else {
1620 enum object_type type;
1621 if (size_only)
1622 type = sha1_object_info(s->sha1, &s->size);
1623 else {
1624 s->data = read_sha1_file(s->sha1, &type, &s->size);
1625 s->should_free = 1;
1626 }
1627 }
1628 return 0;
1629 }
1630
1631 void diff_free_filespec_blob(struct diff_filespec *s)
1632 {
1633 if (s->should_free)
1634 free(s->data);
1635 else if (s->should_munmap)
1636 munmap(s->data, s->size);
1637
1638 if (s->should_free || s->should_munmap) {
1639 s->should_free = s->should_munmap = 0;
1640 s->data = NULL;
1641 }
1642 }
1643
1644 void diff_free_filespec_data(struct diff_filespec *s)
1645 {
1646 diff_free_filespec_blob(s);
1647 free(s->cnt_data);
1648 s->cnt_data = NULL;
1649 }
1650
1651 static void prep_temp_blob(struct diff_tempfile *temp,
1652 void *blob,
1653 unsigned long size,
1654 const unsigned char *sha1,
1655 int mode)
1656 {
1657 int fd;
1658
1659 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1660 if (fd < 0)
1661 die("unable to create temp-file: %s", strerror(errno));
1662 if (write_in_full(fd, blob, size) != size)
1663 die("unable to write temp-file");
1664 close(fd);
1665 temp->name = temp->tmp_path;
1666 strcpy(temp->hex, sha1_to_hex(sha1));
1667 temp->hex[40] = 0;
1668 sprintf(temp->mode, "%06o", mode);
1669 }
1670
1671 static void prepare_temp_file(const char *name,
1672 struct diff_tempfile *temp,
1673 struct diff_filespec *one)
1674 {
1675 if (!DIFF_FILE_VALID(one)) {
1676 not_a_valid_file:
1677 /* A '-' entry produces this for file-2, and
1678 * a '+' entry produces this for file-1.
1679 */
1680 temp->name = "/dev/null";
1681 strcpy(temp->hex, ".");
1682 strcpy(temp->mode, ".");
1683 return;
1684 }
1685
1686 if (!one->sha1_valid ||
1687 reuse_worktree_file(name, one->sha1, 1)) {
1688 struct stat st;
1689 if (lstat(name, &st) < 0) {
1690 if (errno == ENOENT)
1691 goto not_a_valid_file;
1692 die("stat(%s): %s", name, strerror(errno));
1693 }
1694 if (S_ISLNK(st.st_mode)) {
1695 int ret;
1696 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1697 size_t sz = xsize_t(st.st_size);
1698 if (sizeof(buf) <= st.st_size)
1699 die("symlink too long: %s", name);
1700 ret = readlink(name, buf, sz);
1701 if (ret < 0)
1702 die("readlink(%s)", name);
1703 prep_temp_blob(temp, buf, sz,
1704 (one->sha1_valid ?
1705 one->sha1 : null_sha1),
1706 (one->sha1_valid ?
1707 one->mode : S_IFLNK));
1708 }
1709 else {
1710 /* we can borrow from the file in the work tree */
1711 temp->name = name;
1712 if (!one->sha1_valid)
1713 strcpy(temp->hex, sha1_to_hex(null_sha1));
1714 else
1715 strcpy(temp->hex, sha1_to_hex(one->sha1));
1716 /* Even though we may sometimes borrow the
1717 * contents from the work tree, we always want
1718 * one->mode. mode is trustworthy even when
1719 * !(one->sha1_valid), as long as
1720 * DIFF_FILE_VALID(one).
1721 */
1722 sprintf(temp->mode, "%06o", one->mode);
1723 }
1724 return;
1725 }
1726 else {
1727 if (diff_populate_filespec(one, 0))
1728 die("cannot read data blob for %s", one->path);
1729 prep_temp_blob(temp, one->data, one->size,
1730 one->sha1, one->mode);
1731 }
1732 }
1733
1734 static void remove_tempfile(void)
1735 {
1736 int i;
1737
1738 for (i = 0; i < 2; i++)
1739 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1740 unlink(diff_temp[i].name);
1741 diff_temp[i].name = NULL;
1742 }
1743 }
1744
1745 static void remove_tempfile_on_signal(int signo)
1746 {
1747 remove_tempfile();
1748 signal(SIGINT, SIG_DFL);
1749 raise(signo);
1750 }
1751
1752 /* An external diff command takes:
1753 *
1754 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1755 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1756 *
1757 */
1758 static void run_external_diff(const char *pgm,
1759 const char *name,
1760 const char *other,
1761 struct diff_filespec *one,
1762 struct diff_filespec *two,
1763 const char *xfrm_msg,
1764 int complete_rewrite)
1765 {
1766 const char *spawn_arg[10];
1767 struct diff_tempfile *temp = diff_temp;
1768 int retval;
1769 static int atexit_asked = 0;
1770 const char *othername;
1771 const char **arg = &spawn_arg[0];
1772
1773 othername = (other? other : name);
1774 if (one && two) {
1775 prepare_temp_file(name, &temp[0], one);
1776 prepare_temp_file(othername, &temp[1], two);
1777 if (! atexit_asked &&
1778 (temp[0].name == temp[0].tmp_path ||
1779 temp[1].name == temp[1].tmp_path)) {
1780 atexit_asked = 1;
1781 atexit(remove_tempfile);
1782 }
1783 signal(SIGINT, remove_tempfile_on_signal);
1784 }
1785
1786 if (one && two) {
1787 *arg++ = pgm;
1788 *arg++ = name;
1789 *arg++ = temp[0].name;
1790 *arg++ = temp[0].hex;
1791 *arg++ = temp[0].mode;
1792 *arg++ = temp[1].name;
1793 *arg++ = temp[1].hex;
1794 *arg++ = temp[1].mode;
1795 if (other) {
1796 *arg++ = other;
1797 *arg++ = xfrm_msg;
1798 }
1799 } else {
1800 *arg++ = pgm;
1801 *arg++ = name;
1802 }
1803 *arg = NULL;
1804 fflush(NULL);
1805 retval = run_command_v_opt(spawn_arg, 0);
1806 remove_tempfile();
1807 if (retval) {
1808 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1809 exit(1);
1810 }
1811 }
1812
1813 static const char *external_diff_attr(const char *name)
1814 {
1815 struct git_attr_check attr_diff_check;
1816
1817 setup_diff_attr_check(&attr_diff_check);
1818 if (!git_checkattr(name, 1, &attr_diff_check)) {
1819 const char *value = attr_diff_check.value;
1820 if (!ATTR_TRUE(value) &&
1821 !ATTR_FALSE(value) &&
1822 !ATTR_UNSET(value)) {
1823 struct ll_diff_driver *drv;
1824
1825 read_config_if_needed();
1826 for (drv = user_diff; drv; drv = drv->next)
1827 if (!strcmp(drv->name, value))
1828 return drv->cmd;
1829 }
1830 }
1831 return NULL;
1832 }
1833
1834 static void run_diff_cmd(const char *pgm,
1835 const char *name,
1836 const char *other,
1837 struct diff_filespec *one,
1838 struct diff_filespec *two,
1839 const char *xfrm_msg,
1840 struct diff_options *o,
1841 int complete_rewrite)
1842 {
1843 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
1844 pgm = NULL;
1845 else {
1846 const char *cmd = external_diff_attr(name);
1847 if (cmd)
1848 pgm = cmd;
1849 }
1850
1851 if (pgm) {
1852 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1853 complete_rewrite);
1854 return;
1855 }
1856 if (one && two)
1857 builtin_diff(name, other ? other : name,
1858 one, two, xfrm_msg, o, complete_rewrite);
1859 else
1860 printf("* Unmerged path %s\n", name);
1861 }
1862
1863 static void diff_fill_sha1_info(struct diff_filespec *one)
1864 {
1865 if (DIFF_FILE_VALID(one)) {
1866 if (!one->sha1_valid) {
1867 struct stat st;
1868 if (!strcmp(one->path, "-")) {
1869 hashcpy(one->sha1, null_sha1);
1870 return;
1871 }
1872 if (lstat(one->path, &st) < 0)
1873 die("stat %s", one->path);
1874 if (index_path(one->sha1, one->path, &st, 0))
1875 die("cannot hash %s\n", one->path);
1876 }
1877 }
1878 else
1879 hashclr(one->sha1);
1880 }
1881
1882 static int similarity_index(struct diff_filepair *p)
1883 {
1884 return p->score * 100 / MAX_SCORE;
1885 }
1886
1887 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1888 {
1889 const char *pgm = external_diff();
1890 struct strbuf msg;
1891 char *xfrm_msg;
1892 struct diff_filespec *one = p->one;
1893 struct diff_filespec *two = p->two;
1894 const char *name;
1895 const char *other;
1896 int complete_rewrite = 0;
1897
1898
1899 if (DIFF_PAIR_UNMERGED(p)) {
1900 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1901 return;
1902 }
1903
1904 name = p->one->path;
1905 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1906 diff_fill_sha1_info(one);
1907 diff_fill_sha1_info(two);
1908
1909 strbuf_init(&msg, PATH_MAX * 2 + 300);
1910 switch (p->status) {
1911 case DIFF_STATUS_COPIED:
1912 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1913 strbuf_addstr(&msg, "\ncopy from ");
1914 quote_c_style(name, &msg, NULL, 0);
1915 strbuf_addstr(&msg, "\ncopy to ");
1916 quote_c_style(other, &msg, NULL, 0);
1917 strbuf_addch(&msg, '\n');
1918 break;
1919 case DIFF_STATUS_RENAMED:
1920 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1921 strbuf_addstr(&msg, "\nrename from ");
1922 quote_c_style(name, &msg, NULL, 0);
1923 strbuf_addstr(&msg, "\nrename to ");
1924 quote_c_style(other, &msg, NULL, 0);
1925 strbuf_addch(&msg, '\n');
1926 break;
1927 case DIFF_STATUS_MODIFIED:
1928 if (p->score) {
1929 strbuf_addf(&msg, "dissimilarity index %d%%\n",
1930 similarity_index(p));
1931 complete_rewrite = 1;
1932 break;
1933 }
1934 /* fallthru */
1935 default:
1936 /* nothing */
1937 ;
1938 }
1939
1940 if (hashcmp(one->sha1, two->sha1)) {
1941 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
1942
1943 if (DIFF_OPT_TST(o, BINARY)) {
1944 mmfile_t mf;
1945 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
1946 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
1947 abbrev = 40;
1948 }
1949 strbuf_addf(&msg, "index %.*s..%.*s",
1950 abbrev, sha1_to_hex(one->sha1),
1951 abbrev, sha1_to_hex(two->sha1));
1952 if (one->mode == two->mode)
1953 strbuf_addf(&msg, " %06o", one->mode);
1954 strbuf_addch(&msg, '\n');
1955 }
1956
1957 if (msg.len)
1958 strbuf_setlen(&msg, msg.len - 1);
1959 xfrm_msg = msg.len ? msg.buf : NULL;
1960
1961 if (!pgm &&
1962 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1963 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1964 /* a filepair that changes between file and symlink
1965 * needs to be split into deletion and creation.
1966 */
1967 struct diff_filespec *null = alloc_filespec(two->path);
1968 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1969 free(null);
1970 null = alloc_filespec(one->path);
1971 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1972 free(null);
1973 }
1974 else
1975 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1976 complete_rewrite);
1977
1978 strbuf_release(&msg);
1979 }
1980
1981 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1982 struct diffstat_t *diffstat)
1983 {
1984 const char *name;
1985 const char *other;
1986 int complete_rewrite = 0;
1987
1988 if (DIFF_PAIR_UNMERGED(p)) {
1989 /* unmerged */
1990 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1991 return;
1992 }
1993
1994 name = p->one->path;
1995 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1996
1997 diff_fill_sha1_info(p->one);
1998 diff_fill_sha1_info(p->two);
1999
2000 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2001 complete_rewrite = 1;
2002 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2003 }
2004
2005 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2006 {
2007 const char *name;
2008 const char *other;
2009
2010 if (DIFF_PAIR_UNMERGED(p)) {
2011 /* unmerged */
2012 return;
2013 }
2014
2015 name = p->one->path;
2016 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2017
2018 diff_fill_sha1_info(p->one);
2019 diff_fill_sha1_info(p->two);
2020
2021 builtin_checkdiff(name, other, p->one, p->two, o);
2022 }
2023
2024 void diff_setup(struct diff_options *options)
2025 {
2026 memset(options, 0, sizeof(*options));
2027 options->line_termination = '\n';
2028 options->break_opt = -1;
2029 options->rename_limit = -1;
2030 options->context = 3;
2031 options->msg_sep = "";
2032
2033 options->change = diff_change;
2034 options->add_remove = diff_addremove;
2035 if (diff_use_color_default)
2036 DIFF_OPT_SET(options, COLOR_DIFF);
2037 else
2038 DIFF_OPT_CLR(options, COLOR_DIFF);
2039 options->detect_rename = diff_detect_rename_default;
2040
2041 options->a_prefix = "a/";
2042 options->b_prefix = "b/";
2043 }
2044
2045 int diff_setup_done(struct diff_options *options)
2046 {
2047 int count = 0;
2048
2049 if (options->output_format & DIFF_FORMAT_NAME)
2050 count++;
2051 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2052 count++;
2053 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2054 count++;
2055 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2056 count++;
2057 if (count > 1)
2058 die("--name-only, --name-status, --check and -s are mutually exclusive");
2059
2060 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2061 options->detect_rename = DIFF_DETECT_COPY;
2062
2063 if (options->output_format & (DIFF_FORMAT_NAME |
2064 DIFF_FORMAT_NAME_STATUS |
2065 DIFF_FORMAT_CHECKDIFF |
2066 DIFF_FORMAT_NO_OUTPUT))
2067 options->output_format &= ~(DIFF_FORMAT_RAW |
2068 DIFF_FORMAT_NUMSTAT |
2069 DIFF_FORMAT_DIFFSTAT |
2070 DIFF_FORMAT_SHORTSTAT |
2071 DIFF_FORMAT_SUMMARY |
2072 DIFF_FORMAT_PATCH);
2073
2074 /*
2075 * These cases always need recursive; we do not drop caller-supplied
2076 * recursive bits for other formats here.
2077 */
2078 if (options->output_format & (DIFF_FORMAT_PATCH |
2079 DIFF_FORMAT_NUMSTAT |
2080 DIFF_FORMAT_DIFFSTAT |
2081 DIFF_FORMAT_SHORTSTAT |
2082 DIFF_FORMAT_SUMMARY |
2083 DIFF_FORMAT_CHECKDIFF))
2084 DIFF_OPT_SET(options, RECURSIVE);
2085 /*
2086 * Also pickaxe would not work very well if you do not say recursive
2087 */
2088 if (options->pickaxe)
2089 DIFF_OPT_SET(options, RECURSIVE);
2090
2091 if (options->detect_rename && options->rename_limit < 0)
2092 options->rename_limit = diff_rename_limit_default;
2093 if (options->setup & DIFF_SETUP_USE_CACHE) {
2094 if (!active_cache)
2095 /* read-cache does not die even when it fails
2096 * so it is safe for us to do this here. Also
2097 * it does not smudge active_cache or active_nr
2098 * when it fails, so we do not have to worry about
2099 * cleaning it up ourselves either.
2100 */
2101 read_cache();
2102 }
2103 if (options->abbrev <= 0 || 40 < options->abbrev)
2104 options->abbrev = 40; /* full */
2105
2106 /*
2107 * It does not make sense to show the first hit we happened
2108 * to have found. It does not make sense not to return with
2109 * exit code in such a case either.
2110 */
2111 if (DIFF_OPT_TST(options, QUIET)) {
2112 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2113 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2114 }
2115
2116 /*
2117 * If we postprocess in diffcore, we cannot simply return
2118 * upon the first hit. We need to run diff as usual.
2119 */
2120 if (options->pickaxe || options->filter)
2121 DIFF_OPT_CLR(options, QUIET);
2122
2123 return 0;
2124 }
2125
2126 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2127 {
2128 char c, *eq;
2129 int len;
2130
2131 if (*arg != '-')
2132 return 0;
2133 c = *++arg;
2134 if (!c)
2135 return 0;
2136 if (c == arg_short) {
2137 c = *++arg;
2138 if (!c)
2139 return 1;
2140 if (val && isdigit(c)) {
2141 char *end;
2142 int n = strtoul(arg, &end, 10);
2143 if (*end)
2144 return 0;
2145 *val = n;
2146 return 1;
2147 }
2148 return 0;
2149 }
2150 if (c != '-')
2151 return 0;
2152 arg++;
2153 eq = strchr(arg, '=');
2154 if (eq)
2155 len = eq - arg;
2156 else
2157 len = strlen(arg);
2158 if (!len || strncmp(arg, arg_long, len))
2159 return 0;
2160 if (eq) {
2161 int n;
2162 char *end;
2163 if (!isdigit(*++eq))
2164 return 0;
2165 n = strtoul(eq, &end, 10);
2166 if (*end)
2167 return 0;
2168 *val = n;
2169 }
2170 return 1;
2171 }
2172
2173 static int diff_scoreopt_parse(const char *opt);
2174
2175 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2176 {
2177 const char *arg = av[0];
2178
2179 /* Output format options */
2180 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2181 options->output_format |= DIFF_FORMAT_PATCH;
2182 else if (opt_arg(arg, 'U', "unified", &options->context))
2183 options->output_format |= DIFF_FORMAT_PATCH;
2184 else if (!strcmp(arg, "--raw"))
2185 options->output_format |= DIFF_FORMAT_RAW;
2186 else if (!strcmp(arg, "--patch-with-raw"))
2187 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2188 else if (!strcmp(arg, "--numstat"))
2189 options->output_format |= DIFF_FORMAT_NUMSTAT;
2190 else if (!strcmp(arg, "--shortstat"))
2191 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2192 else if (!strcmp(arg, "--check"))
2193 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2194 else if (!strcmp(arg, "--summary"))
2195 options->output_format |= DIFF_FORMAT_SUMMARY;
2196 else if (!strcmp(arg, "--patch-with-stat"))
2197 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2198 else if (!strcmp(arg, "--name-only"))
2199 options->output_format |= DIFF_FORMAT_NAME;
2200 else if (!strcmp(arg, "--name-status"))
2201 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2202 else if (!strcmp(arg, "-s"))
2203 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2204 else if (!prefixcmp(arg, "--stat")) {
2205 char *end;
2206 int width = options->stat_width;
2207 int name_width = options->stat_name_width;
2208 arg += 6;
2209 end = (char *)arg;
2210
2211 switch (*arg) {
2212 case '-':
2213 if (!prefixcmp(arg, "-width="))
2214 width = strtoul(arg + 7, &end, 10);
2215 else if (!prefixcmp(arg, "-name-width="))
2216 name_width = strtoul(arg + 12, &end, 10);
2217 break;
2218 case '=':
2219 width = strtoul(arg+1, &end, 10);
2220 if (*end == ',')
2221 name_width = strtoul(end+1, &end, 10);
2222 }
2223
2224 /* Important! This checks all the error cases! */
2225 if (*end)
2226 return 0;
2227 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2228 options->stat_name_width = name_width;
2229 options->stat_width = width;
2230 }
2231
2232 /* renames options */
2233 else if (!prefixcmp(arg, "-B")) {
2234 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2235 return -1;
2236 }
2237 else if (!prefixcmp(arg, "-M")) {
2238 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2239 return -1;
2240 options->detect_rename = DIFF_DETECT_RENAME;
2241 }
2242 else if (!prefixcmp(arg, "-C")) {
2243 if (options->detect_rename == DIFF_DETECT_COPY)
2244 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2245 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2246 return -1;
2247 options->detect_rename = DIFF_DETECT_COPY;
2248 }
2249 else if (!strcmp(arg, "--no-renames"))
2250 options->detect_rename = 0;
2251
2252 /* xdiff options */
2253 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2254 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2255 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2256 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2257 else if (!strcmp(arg, "--ignore-space-at-eol"))
2258 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2259
2260 /* flags options */
2261 else if (!strcmp(arg, "--binary")) {
2262 options->output_format |= DIFF_FORMAT_PATCH;
2263 DIFF_OPT_SET(options, BINARY);
2264 }
2265 else if (!strcmp(arg, "--full-index"))
2266 DIFF_OPT_SET(options, FULL_INDEX);
2267 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2268 DIFF_OPT_SET(options, TEXT);
2269 else if (!strcmp(arg, "-R"))
2270 DIFF_OPT_SET(options, REVERSE_DIFF);
2271 else if (!strcmp(arg, "--find-copies-harder"))
2272 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2273 else if (!strcmp(arg, "--follow"))
2274 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2275 else if (!strcmp(arg, "--color"))
2276 DIFF_OPT_SET(options, COLOR_DIFF);
2277 else if (!strcmp(arg, "--no-color"))
2278 DIFF_OPT_CLR(options, COLOR_DIFF);
2279 else if (!strcmp(arg, "--color-words"))
2280 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2281 else if (!strcmp(arg, "--exit-code"))
2282 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2283 else if (!strcmp(arg, "--quiet"))
2284 DIFF_OPT_SET(options, QUIET);
2285 else if (!strcmp(arg, "--ext-diff"))
2286 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2287 else if (!strcmp(arg, "--no-ext-diff"))
2288 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2289
2290 /* misc options */
2291 else if (!strcmp(arg, "-z"))
2292 options->line_termination = 0;
2293 else if (!prefixcmp(arg, "-l"))
2294 options->rename_limit = strtoul(arg+2, NULL, 10);
2295 else if (!prefixcmp(arg, "-S"))
2296 options->pickaxe = arg + 2;
2297 else if (!strcmp(arg, "--pickaxe-all"))
2298 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2299 else if (!strcmp(arg, "--pickaxe-regex"))
2300 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2301 else if (!prefixcmp(arg, "-O"))
2302 options->orderfile = arg + 2;
2303 else if (!prefixcmp(arg, "--diff-filter="))
2304 options->filter = arg + 14;
2305 else if (!strcmp(arg, "--abbrev"))
2306 options->abbrev = DEFAULT_ABBREV;
2307 else if (!prefixcmp(arg, "--abbrev=")) {
2308 options->abbrev = strtoul(arg + 9, NULL, 10);
2309 if (options->abbrev < MINIMUM_ABBREV)
2310 options->abbrev = MINIMUM_ABBREV;
2311 else if (40 < options->abbrev)
2312 options->abbrev = 40;
2313 }
2314 else if (!prefixcmp(arg, "--src-prefix="))
2315 options->a_prefix = arg + 13;
2316 else if (!prefixcmp(arg, "--dst-prefix="))
2317 options->b_prefix = arg + 13;
2318 else if (!strcmp(arg, "--no-prefix"))
2319 options->a_prefix = options->b_prefix = "";
2320 else
2321 return 0;
2322 return 1;
2323 }
2324
2325 static int parse_num(const char **cp_p)
2326 {
2327 unsigned long num, scale;
2328 int ch, dot;
2329 const char *cp = *cp_p;
2330
2331 num = 0;
2332 scale = 1;
2333 dot = 0;
2334 for(;;) {
2335 ch = *cp;
2336 if ( !dot && ch == '.' ) {
2337 scale = 1;
2338 dot = 1;
2339 } else if ( ch == '%' ) {
2340 scale = dot ? scale*100 : 100;
2341 cp++; /* % is always at the end */
2342 break;
2343 } else if ( ch >= '0' && ch <= '9' ) {
2344 if ( scale < 100000 ) {
2345 scale *= 10;
2346 num = (num*10) + (ch-'0');
2347 }
2348 } else {
2349 break;
2350 }
2351 cp++;
2352 }
2353 *cp_p = cp;
2354
2355 /* user says num divided by scale and we say internally that
2356 * is MAX_SCORE * num / scale.
2357 */
2358 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2359 }
2360
2361 static int diff_scoreopt_parse(const char *opt)
2362 {
2363 int opt1, opt2, cmd;
2364
2365 if (*opt++ != '-')
2366 return -1;
2367 cmd = *opt++;
2368 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2369 return -1; /* that is not a -M, -C nor -B option */
2370
2371 opt1 = parse_num(&opt);
2372 if (cmd != 'B')
2373 opt2 = 0;
2374 else {
2375 if (*opt == 0)
2376 opt2 = 0;
2377 else if (*opt != '/')
2378 return -1; /* we expect -B80/99 or -B80 */
2379 else {
2380 opt++;
2381 opt2 = parse_num(&opt);
2382 }
2383 }
2384 if (*opt != 0)
2385 return -1;
2386 return opt1 | (opt2 << 16);
2387 }
2388
2389 struct diff_queue_struct diff_queued_diff;
2390
2391 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2392 {
2393 if (queue->alloc <= queue->nr) {
2394 queue->alloc = alloc_nr(queue->alloc);
2395 queue->queue = xrealloc(queue->queue,
2396 sizeof(dp) * queue->alloc);
2397 }
2398 queue->queue[queue->nr++] = dp;
2399 }
2400
2401 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2402 struct diff_filespec *one,
2403 struct diff_filespec *two)
2404 {
2405 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2406 dp->one = one;
2407 dp->two = two;
2408 if (queue)
2409 diff_q(queue, dp);
2410 return dp;
2411 }
2412
2413 void diff_free_filepair(struct diff_filepair *p)
2414 {
2415 free_filespec(p->one);
2416 free_filespec(p->two);
2417 free(p);
2418 }
2419
2420 /* This is different from find_unique_abbrev() in that
2421 * it stuffs the result with dots for alignment.
2422 */
2423 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2424 {
2425 int abblen;
2426 const char *abbrev;
2427 if (len == 40)
2428 return sha1_to_hex(sha1);
2429
2430 abbrev = find_unique_abbrev(sha1, len);
2431 if (!abbrev)
2432 return sha1_to_hex(sha1);
2433 abblen = strlen(abbrev);
2434 if (abblen < 37) {
2435 static char hex[41];
2436 if (len < abblen && abblen <= len + 2)
2437 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2438 else
2439 sprintf(hex, "%s...", abbrev);
2440 return hex;
2441 }
2442 return sha1_to_hex(sha1);
2443 }
2444
2445 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2446 {
2447 int line_termination = opt->line_termination;
2448 int inter_name_termination = line_termination ? '\t' : '\0';
2449
2450 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2451 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2452 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2453 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2454 }
2455 if (p->score) {
2456 printf("%c%03d%c", p->status, similarity_index(p),
2457 inter_name_termination);
2458 } else {
2459 printf("%c%c", p->status, inter_name_termination);
2460 }
2461
2462 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2463 write_name_quoted(p->one->path, stdout, inter_name_termination);
2464 write_name_quoted(p->two->path, stdout, line_termination);
2465 } else {
2466 const char *path = p->one->mode ? p->one->path : p->two->path;
2467 write_name_quoted(path, stdout, line_termination);
2468 }
2469 }
2470
2471 int diff_unmodified_pair(struct diff_filepair *p)
2472 {
2473 /* This function is written stricter than necessary to support
2474 * the currently implemented transformers, but the idea is to
2475 * let transformers to produce diff_filepairs any way they want,
2476 * and filter and clean them up here before producing the output.
2477 */
2478 struct diff_filespec *one = p->one, *two = p->two;
2479
2480 if (DIFF_PAIR_UNMERGED(p))
2481 return 0; /* unmerged is interesting */
2482
2483 /* deletion, addition, mode or type change
2484 * and rename are all interesting.
2485 */
2486 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2487 DIFF_PAIR_MODE_CHANGED(p) ||
2488 strcmp(one->path, two->path))
2489 return 0;
2490
2491 /* both are valid and point at the same path. that is, we are
2492 * dealing with a change.
2493 */
2494 if (one->sha1_valid && two->sha1_valid &&
2495 !hashcmp(one->sha1, two->sha1))
2496 return 1; /* no change */
2497 if (!one->sha1_valid && !two->sha1_valid)
2498 return 1; /* both look at the same file on the filesystem. */
2499 return 0;
2500 }
2501
2502 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2503 {
2504 if (diff_unmodified_pair(p))
2505 return;
2506
2507 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2508 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2509 return; /* no tree diffs in patch format */
2510
2511 run_diff(p, o);
2512 }
2513
2514 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2515 struct diffstat_t *diffstat)
2516 {
2517 if (diff_unmodified_pair(p))
2518 return;
2519
2520 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2521 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2522 return; /* no tree diffs in patch format */
2523
2524 run_diffstat(p, o, diffstat);
2525 }
2526
2527 static void diff_flush_checkdiff(struct diff_filepair *p,
2528 struct diff_options *o)
2529 {
2530 if (diff_unmodified_pair(p))
2531 return;
2532
2533 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2534 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2535 return; /* no tree diffs in patch format */
2536
2537 run_checkdiff(p, o);
2538 }
2539
2540 int diff_queue_is_empty(void)
2541 {
2542 struct diff_queue_struct *q = &diff_queued_diff;
2543 int i;
2544 for (i = 0; i < q->nr; i++)
2545 if (!diff_unmodified_pair(q->queue[i]))
2546 return 0;
2547 return 1;
2548 }
2549
2550 #if DIFF_DEBUG
2551 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2552 {
2553 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2554 x, one ? one : "",
2555 s->path,
2556 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2557 s->mode,
2558 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2559 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2560 x, one ? one : "",
2561 s->size, s->xfrm_flags);
2562 }
2563
2564 void diff_debug_filepair(const struct diff_filepair *p, int i)
2565 {
2566 diff_debug_filespec(p->one, i, "one");
2567 diff_debug_filespec(p->two, i, "two");
2568 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2569 p->score, p->status ? p->status : '?',
2570 p->one->rename_used, p->broken_pair);
2571 }
2572
2573 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2574 {
2575 int i;
2576 if (msg)
2577 fprintf(stderr, "%s\n", msg);
2578 fprintf(stderr, "q->nr = %d\n", q->nr);
2579 for (i = 0; i < q->nr; i++) {
2580 struct diff_filepair *p = q->queue[i];
2581 diff_debug_filepair(p, i);
2582 }
2583 }
2584 #endif
2585
2586 static void diff_resolve_rename_copy(void)
2587 {
2588 int i;
2589 struct diff_filepair *p;
2590 struct diff_queue_struct *q = &diff_queued_diff;
2591
2592 diff_debug_queue("resolve-rename-copy", q);
2593
2594 for (i = 0; i < q->nr; i++) {
2595 p = q->queue[i];
2596 p->status = 0; /* undecided */
2597 if (DIFF_PAIR_UNMERGED(p))
2598 p->status = DIFF_STATUS_UNMERGED;
2599 else if (!DIFF_FILE_VALID(p->one))
2600 p->status = DIFF_STATUS_ADDED;
2601 else if (!DIFF_FILE_VALID(p->two))
2602 p->status = DIFF_STATUS_DELETED;
2603 else if (DIFF_PAIR_TYPE_CHANGED(p))
2604 p->status = DIFF_STATUS_TYPE_CHANGED;
2605
2606 /* from this point on, we are dealing with a pair
2607 * whose both sides are valid and of the same type, i.e.
2608 * either in-place edit or rename/copy edit.
2609 */
2610 else if (DIFF_PAIR_RENAME(p)) {
2611 /*
2612 * A rename might have re-connected a broken
2613 * pair up, causing the pathnames to be the
2614 * same again. If so, that's not a rename at
2615 * all, just a modification..
2616 *
2617 * Otherwise, see if this source was used for
2618 * multiple renames, in which case we decrement
2619 * the count, and call it a copy.
2620 */
2621 if (!strcmp(p->one->path, p->two->path))
2622 p->status = DIFF_STATUS_MODIFIED;
2623 else if (--p->one->rename_used > 0)
2624 p->status = DIFF_STATUS_COPIED;
2625 else
2626 p->status = DIFF_STATUS_RENAMED;
2627 }
2628 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2629 p->one->mode != p->two->mode ||
2630 is_null_sha1(p->one->sha1))
2631 p->status = DIFF_STATUS_MODIFIED;
2632 else {
2633 /* This is a "no-change" entry and should not
2634 * happen anymore, but prepare for broken callers.
2635 */
2636 error("feeding unmodified %s to diffcore",
2637 p->one->path);
2638 p->status = DIFF_STATUS_UNKNOWN;
2639 }
2640 }
2641 diff_debug_queue("resolve-rename-copy done", q);
2642 }
2643
2644 static int check_pair_status(struct diff_filepair *p)
2645 {
2646 switch (p->status) {
2647 case DIFF_STATUS_UNKNOWN:
2648 return 0;
2649 case 0:
2650 die("internal error in diff-resolve-rename-copy");
2651 default:
2652 return 1;
2653 }
2654 }
2655
2656 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2657 {
2658 int fmt = opt->output_format;
2659
2660 if (fmt & DIFF_FORMAT_CHECKDIFF)
2661 diff_flush_checkdiff(p, opt);
2662 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2663 diff_flush_raw(p, opt);
2664 else if (fmt & DIFF_FORMAT_NAME)
2665 write_name_quoted(p->two->path, stdout, opt->line_termination);
2666 }
2667
2668 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2669 {
2670 if (fs->mode)
2671 printf(" %s mode %06o ", newdelete, fs->mode);
2672 else
2673 printf(" %s ", newdelete);
2674 write_name_quoted(fs->path, stdout, '\n');
2675 }
2676
2677
2678 static void show_mode_change(struct diff_filepair *p, int show_name)
2679 {
2680 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2681 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2682 show_name ? ' ' : '\n');
2683 if (show_name) {
2684 write_name_quoted(p->two->path, stdout, '\n');
2685 }
2686 }
2687 }
2688
2689 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2690 {
2691 char *names = pprint_rename(p->one->path, p->two->path);
2692
2693 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2694 free(names);
2695 show_mode_change(p, 0);
2696 }
2697
2698 static void diff_summary(struct diff_filepair *p)
2699 {
2700 switch(p->status) {
2701 case DIFF_STATUS_DELETED:
2702 show_file_mode_name("delete", p->one);
2703 break;
2704 case DIFF_STATUS_ADDED:
2705 show_file_mode_name("create", p->two);
2706 break;
2707 case DIFF_STATUS_COPIED:
2708 show_rename_copy("copy", p);
2709 break;
2710 case DIFF_STATUS_RENAMED:
2711 show_rename_copy("rename", p);
2712 break;
2713 default:
2714 if (p->score) {
2715 fputs(" rewrite ", stdout);
2716 write_name_quoted(p->two->path, stdout, ' ');
2717 printf("(%d%%)\n", similarity_index(p));
2718 }
2719 show_mode_change(p, !p->score);
2720 break;
2721 }
2722 }
2723
2724 struct patch_id_t {
2725 struct xdiff_emit_state xm;
2726 SHA_CTX *ctx;
2727 int patchlen;
2728 };
2729
2730 static int remove_space(char *line, int len)
2731 {
2732 int i;
2733 char *dst = line;
2734 unsigned char c;
2735
2736 for (i = 0; i < len; i++)
2737 if (!isspace((c = line[i])))
2738 *dst++ = c;
2739
2740 return dst - line;
2741 }
2742
2743 static void patch_id_consume(void *priv, char *line, unsigned long len)
2744 {
2745 struct patch_id_t *data = priv;
2746 int new_len;
2747
2748 /* Ignore line numbers when computing the SHA1 of the patch */
2749 if (!prefixcmp(line, "@@ -"))
2750 return;
2751
2752 new_len = remove_space(line, len);
2753
2754 SHA1_Update(data->ctx, line, new_len);
2755 data->patchlen += new_len;
2756 }
2757
2758 /* returns 0 upon success, and writes result into sha1 */
2759 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2760 {
2761 struct diff_queue_struct *q = &diff_queued_diff;
2762 int i;
2763 SHA_CTX ctx;
2764 struct patch_id_t data;
2765 char buffer[PATH_MAX * 4 + 20];
2766
2767 SHA1_Init(&ctx);
2768 memset(&data, 0, sizeof(struct patch_id_t));
2769 data.ctx = &ctx;
2770 data.xm.consume = patch_id_consume;
2771
2772 for (i = 0; i < q->nr; i++) {
2773 xpparam_t xpp;
2774 xdemitconf_t xecfg;
2775 xdemitcb_t ecb;
2776 mmfile_t mf1, mf2;
2777 struct diff_filepair *p = q->queue[i];
2778 int len1, len2;
2779
2780 memset(&xecfg, 0, sizeof(xecfg));
2781 if (p->status == 0)
2782 return error("internal diff status error");
2783 if (p->status == DIFF_STATUS_UNKNOWN)
2784 continue;
2785 if (diff_unmodified_pair(p))
2786 continue;
2787 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2788 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2789 continue;
2790 if (DIFF_PAIR_UNMERGED(p))
2791 continue;
2792
2793 diff_fill_sha1_info(p->one);
2794 diff_fill_sha1_info(p->two);
2795 if (fill_mmfile(&mf1, p->one) < 0 ||
2796 fill_mmfile(&mf2, p->two) < 0)
2797 return error("unable to read files to diff");
2798
2799 len1 = remove_space(p->one->path, strlen(p->one->path));
2800 len2 = remove_space(p->two->path, strlen(p->two->path));
2801 if (p->one->mode == 0)
2802 len1 = snprintf(buffer, sizeof(buffer),
2803 "diff--gita/%.*sb/%.*s"
2804 "newfilemode%06o"
2805 "---/dev/null"
2806 "+++b/%.*s",
2807 len1, p->one->path,
2808 len2, p->two->path,
2809 p->two->mode,
2810 len2, p->two->path);
2811 else if (p->two->mode == 0)
2812 len1 = snprintf(buffer, sizeof(buffer),
2813 "diff--gita/%.*sb/%.*s"
2814 "deletedfilemode%06o"
2815 "---a/%.*s"
2816 "+++/dev/null",
2817 len1, p->one->path,
2818 len2, p->two->path,
2819 p->one->mode,
2820 len1, p->one->path);
2821 else
2822 len1 = snprintf(buffer, sizeof(buffer),
2823 "diff--gita/%.*sb/%.*s"
2824 "---a/%.*s"
2825 "+++b/%.*s",
2826 len1, p->one->path,
2827 len2, p->two->path,
2828 len1, p->one->path,
2829 len2, p->two->path);
2830 SHA1_Update(&ctx, buffer, len1);
2831
2832 xpp.flags = XDF_NEED_MINIMAL;
2833 xecfg.ctxlen = 3;
2834 xecfg.flags = XDL_EMIT_FUNCNAMES;
2835 ecb.outf = xdiff_outf;
2836 ecb.priv = &data;
2837 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2838 }
2839
2840 SHA1_Final(sha1, &ctx);
2841 return 0;
2842 }
2843
2844 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2845 {
2846 struct diff_queue_struct *q = &diff_queued_diff;
2847 int i;
2848 int result = diff_get_patch_id(options, sha1);
2849
2850 for (i = 0; i < q->nr; i++)
2851 diff_free_filepair(q->queue[i]);
2852
2853 free(q->queue);
2854 q->queue = NULL;
2855 q->nr = q->alloc = 0;
2856
2857 return result;
2858 }
2859
2860 static int is_summary_empty(const struct diff_queue_struct *q)
2861 {
2862 int i;
2863
2864 for (i = 0; i < q->nr; i++) {
2865 const struct diff_filepair *p = q->queue[i];
2866
2867 switch (p->status) {
2868 case DIFF_STATUS_DELETED:
2869 case DIFF_STATUS_ADDED:
2870 case DIFF_STATUS_COPIED:
2871 case DIFF_STATUS_RENAMED:
2872 return 0;
2873 default:
2874 if (p->score)
2875 return 0;
2876 if (p->one->mode && p->two->mode &&
2877 p->one->mode != p->two->mode)
2878 return 0;
2879 break;
2880 }
2881 }
2882 return 1;
2883 }
2884
2885 void diff_flush(struct diff_options *options)
2886 {
2887 struct diff_queue_struct *q = &diff_queued_diff;
2888 int i, output_format = options->output_format;
2889 int separator = 0;
2890
2891 /*
2892 * Order: raw, stat, summary, patch
2893 * or: name/name-status/checkdiff (other bits clear)
2894 */
2895 if (!q->nr)
2896 goto free_queue;
2897
2898 if (output_format & (DIFF_FORMAT_RAW |
2899 DIFF_FORMAT_NAME |
2900 DIFF_FORMAT_NAME_STATUS |
2901 DIFF_FORMAT_CHECKDIFF)) {
2902 for (i = 0; i < q->nr; i++) {
2903 struct diff_filepair *p = q->queue[i];
2904 if (check_pair_status(p))
2905 flush_one_pair(p, options);
2906 }
2907 separator++;
2908 }
2909
2910 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2911 struct diffstat_t diffstat;
2912
2913 memset(&diffstat, 0, sizeof(struct diffstat_t));
2914 diffstat.xm.consume = diffstat_consume;
2915 for (i = 0; i < q->nr; i++) {
2916 struct diff_filepair *p = q->queue[i];
2917 if (check_pair_status(p))
2918 diff_flush_stat(p, options, &diffstat);
2919 }
2920 if (output_format & DIFF_FORMAT_NUMSTAT)
2921 show_numstat(&diffstat, options);
2922 if (output_format & DIFF_FORMAT_DIFFSTAT)
2923 show_stats(&diffstat, options);
2924 if (output_format & DIFF_FORMAT_SHORTSTAT)
2925 show_shortstats(&diffstat);
2926 free_diffstat_info(&diffstat);
2927 separator++;
2928 }
2929
2930 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2931 for (i = 0; i < q->nr; i++)
2932 diff_summary(q->queue[i]);
2933 separator++;
2934 }
2935
2936 if (output_format & DIFF_FORMAT_PATCH) {
2937 if (separator) {
2938 if (options->stat_sep) {
2939 /* attach patch instead of inline */
2940 fputs(options->stat_sep, stdout);
2941 } else {
2942 putchar(options->line_termination);
2943 }
2944 }
2945
2946 for (i = 0; i < q->nr; i++) {
2947 struct diff_filepair *p = q->queue[i];
2948 if (check_pair_status(p))
2949 diff_flush_patch(p, options);
2950 }
2951 }
2952
2953 if (output_format & DIFF_FORMAT_CALLBACK)
2954 options->format_callback(q, options, options->format_callback_data);
2955
2956 for (i = 0; i < q->nr; i++)
2957 diff_free_filepair(q->queue[i]);
2958 free_queue:
2959 free(q->queue);
2960 q->queue = NULL;
2961 q->nr = q->alloc = 0;
2962 }
2963
2964 static void diffcore_apply_filter(const char *filter)
2965 {
2966 int i;
2967 struct diff_queue_struct *q = &diff_queued_diff;
2968 struct diff_queue_struct outq;
2969 outq.queue = NULL;
2970 outq.nr = outq.alloc = 0;
2971
2972 if (!filter)
2973 return;
2974
2975 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2976 int found;
2977 for (i = found = 0; !found && i < q->nr; i++) {
2978 struct diff_filepair *p = q->queue[i];
2979 if (((p->status == DIFF_STATUS_MODIFIED) &&
2980 ((p->score &&
2981 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2982 (!p->score &&
2983 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2984 ((p->status != DIFF_STATUS_MODIFIED) &&
2985 strchr(filter, p->status)))
2986 found++;
2987 }
2988 if (found)
2989 return;
2990
2991 /* otherwise we will clear the whole queue
2992 * by copying the empty outq at the end of this
2993 * function, but first clear the current entries
2994 * in the queue.
2995 */
2996 for (i = 0; i < q->nr; i++)
2997 diff_free_filepair(q->queue[i]);
2998 }
2999 else {
3000 /* Only the matching ones */
3001 for (i = 0; i < q->nr; i++) {
3002 struct diff_filepair *p = q->queue[i];
3003
3004 if (((p->status == DIFF_STATUS_MODIFIED) &&
3005 ((p->score &&
3006 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3007 (!p->score &&
3008 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3009 ((p->status != DIFF_STATUS_MODIFIED) &&
3010 strchr(filter, p->status)))
3011 diff_q(&outq, p);
3012 else
3013 diff_free_filepair(p);
3014 }
3015 }
3016 free(q->queue);
3017 *q = outq;
3018 }
3019
3020 /* Check whether two filespecs with the same mode and size are identical */
3021 static int diff_filespec_is_identical(struct diff_filespec *one,
3022 struct diff_filespec *two)
3023 {
3024 if (S_ISGITLINK(one->mode)) {
3025 diff_fill_sha1_info(one);
3026 diff_fill_sha1_info(two);
3027 return !hashcmp(one->sha1, two->sha1);
3028 }
3029 if (diff_populate_filespec(one, 0))
3030 return 0;
3031 if (diff_populate_filespec(two, 0))
3032 return 0;
3033 return !memcmp(one->data, two->data, one->size);
3034 }
3035
3036 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3037 {
3038 int i;
3039 struct diff_queue_struct *q = &diff_queued_diff;
3040 struct diff_queue_struct outq;
3041 outq.queue = NULL;
3042 outq.nr = outq.alloc = 0;
3043
3044 for (i = 0; i < q->nr; i++) {
3045 struct diff_filepair *p = q->queue[i];
3046
3047 /*
3048 * 1. Entries that come from stat info dirtyness
3049 * always have both sides (iow, not create/delete),
3050 * one side of the object name is unknown, with
3051 * the same mode and size. Keep the ones that
3052 * do not match these criteria. They have real
3053 * differences.
3054 *
3055 * 2. At this point, the file is known to be modified,
3056 * with the same mode and size, and the object
3057 * name of one side is unknown. Need to inspect
3058 * the identical contents.
3059 */
3060 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3061 !DIFF_FILE_VALID(p->two) ||
3062 (p->one->sha1_valid && p->two->sha1_valid) ||
3063 (p->one->mode != p->two->mode) ||
3064 diff_populate_filespec(p->one, 1) ||
3065 diff_populate_filespec(p->two, 1) ||
3066 (p->one->size != p->two->size) ||
3067 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3068 diff_q(&outq, p);
3069 else {
3070 /*
3071 * The caller can subtract 1 from skip_stat_unmatch
3072 * to determine how many paths were dirty only
3073 * due to stat info mismatch.
3074 */
3075 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3076 diffopt->skip_stat_unmatch++;
3077 diff_free_filepair(p);
3078 }
3079 }
3080 free(q->queue);
3081 *q = outq;
3082 }
3083
3084 void diffcore_std(struct diff_options *options)
3085 {
3086 if (DIFF_OPT_TST(options, QUIET))
3087 return;
3088
3089 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3090 diffcore_skip_stat_unmatch(options);
3091 if (options->break_opt != -1)
3092 diffcore_break(options->break_opt);
3093 if (options->detect_rename)
3094 diffcore_rename(options);
3095 if (options->break_opt != -1)
3096 diffcore_merge_broken();
3097 if (options->pickaxe)
3098 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3099 if (options->orderfile)
3100 diffcore_order(options->orderfile);
3101 diff_resolve_rename_copy();
3102 diffcore_apply_filter(options->filter);
3103
3104 if (diff_queued_diff.nr)
3105 DIFF_OPT_SET(options, HAS_CHANGES);
3106 else
3107 DIFF_OPT_CLR(options, HAS_CHANGES);
3108 }
3109
3110 int diff_result_code(struct diff_options *opt, int status)
3111 {
3112 int result = 0;
3113 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3114 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3115 return status;
3116 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3117 DIFF_OPT_TST(opt, HAS_CHANGES))
3118 result |= 01;
3119 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3120 DIFF_OPT_TST(opt, CHECK_FAILED))
3121 result |= 02;
3122 return result;
3123 }
3124
3125 void diff_addremove(struct diff_options *options,
3126 int addremove, unsigned mode,
3127 const unsigned char *sha1,
3128 const char *base, const char *path)
3129 {
3130 char concatpath[PATH_MAX];
3131 struct diff_filespec *one, *two;
3132
3133 /* This may look odd, but it is a preparation for
3134 * feeding "there are unchanged files which should
3135 * not produce diffs, but when you are doing copy
3136 * detection you would need them, so here they are"
3137 * entries to the diff-core. They will be prefixed
3138 * with something like '=' or '*' (I haven't decided
3139 * which but should not make any difference).
3140 * Feeding the same new and old to diff_change()
3141 * also has the same effect.
3142 * Before the final output happens, they are pruned after
3143 * merged into rename/copy pairs as appropriate.
3144 */
3145 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3146 addremove = (addremove == '+' ? '-' :
3147 addremove == '-' ? '+' : addremove);
3148
3149 if (!path) path = "";
3150 sprintf(concatpath, "%s%s", base, path);
3151 one = alloc_filespec(concatpath);
3152 two = alloc_filespec(concatpath);
3153
3154 if (addremove != '+')
3155 fill_filespec(one, sha1, mode);
3156 if (addremove != '-')
3157 fill_filespec(two, sha1, mode);
3158
3159 diff_queue(&diff_queued_diff, one, two);
3160 DIFF_OPT_SET(options, HAS_CHANGES);
3161 }
3162
3163 void diff_change(struct diff_options *options,
3164 unsigned old_mode, unsigned new_mode,
3165 const unsigned char *old_sha1,
3166 const unsigned char *new_sha1,
3167 const char *base, const char *path)
3168 {
3169 char concatpath[PATH_MAX];
3170 struct diff_filespec *one, *two;
3171
3172 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3173 unsigned tmp;
3174 const unsigned char *tmp_c;
3175 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3176 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3177 }
3178 if (!path) path = "";
3179 sprintf(concatpath, "%s%s", base, path);
3180 one = alloc_filespec(concatpath);
3181 two = alloc_filespec(concatpath);
3182 fill_filespec(one, old_sha1, old_mode);
3183 fill_filespec(two, new_sha1, new_mode);
3184
3185 diff_queue(&diff_queued_diff, one, two);
3186 DIFF_OPT_SET(options, HAS_CHANGES);
3187 }
3188
3189 void diff_unmerge(struct diff_options *options,
3190 const char *path,
3191 unsigned mode, const unsigned char *sha1)
3192 {
3193 struct diff_filespec *one, *two;
3194 one = alloc_filespec(path);
3195 two = alloc_filespec(path);
3196 fill_filespec(one, sha1, mode);
3197 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3198 }
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