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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 #include "utf8.h"
15 #ifdef NO_FAST_WORKING_DIRECTORY
16 #define FAST_WORKING_DIRECTORY 0
17 #else
18 #define FAST_WORKING_DIRECTORY 1
19 #endif
21 static int diff_detect_rename_default;
22 static int diff_rename_limit_default = 100;
23 int diff_use_color_default = -1;
24 static const char *external_diff_cmd_cfg;
25 int diff_auto_refresh_index = 1;
27 static char diff_colors[][COLOR_MAXLEN] = {
28 "\033[m", /* reset */
29 "", /* PLAIN (normal) */
30 "\033[1m", /* METAINFO (bold) */
31 "\033[36m", /* FRAGINFO (cyan) */
32 "\033[31m", /* OLD (red) */
33 "\033[32m", /* NEW (green) */
34 "\033[33m", /* COMMIT (yellow) */
35 "\033[41m", /* WHITESPACE (red background) */
36 };
38 static int parse_diff_color_slot(const char *var, int ofs)
39 {
40 if (!strcasecmp(var+ofs, "plain"))
41 return DIFF_PLAIN;
42 if (!strcasecmp(var+ofs, "meta"))
43 return DIFF_METAINFO;
44 if (!strcasecmp(var+ofs, "frag"))
45 return DIFF_FRAGINFO;
46 if (!strcasecmp(var+ofs, "old"))
47 return DIFF_FILE_OLD;
48 if (!strcasecmp(var+ofs, "new"))
49 return DIFF_FILE_NEW;
50 if (!strcasecmp(var+ofs, "commit"))
51 return DIFF_COMMIT;
52 if (!strcasecmp(var+ofs, "whitespace"))
53 return DIFF_WHITESPACE;
54 die("bad config variable '%s'", var);
55 }
57 static struct ll_diff_driver {
58 const char *name;
59 struct ll_diff_driver *next;
60 const char *cmd;
61 } *user_diff, **user_diff_tail;
63 /*
64 * Currently there is only "diff.<drivername>.command" variable;
65 * because there are "diff.color.<slot>" variables, we are parsing
66 * this in a bit convoluted way to allow low level diff driver
67 * called "color".
68 */
69 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
70 {
71 const char *name;
72 int namelen;
73 struct ll_diff_driver *drv;
75 name = var + 5;
76 namelen = ep - name;
77 for (drv = user_diff; drv; drv = drv->next)
78 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
79 break;
80 if (!drv) {
81 drv = xcalloc(1, sizeof(struct ll_diff_driver));
82 drv->name = xmemdupz(name, namelen);
83 if (!user_diff_tail)
84 user_diff_tail = &user_diff;
85 *user_diff_tail = drv;
86 user_diff_tail = &(drv->next);
87 }
89 return git_config_string(&(drv->cmd), var, value);
90 }
92 /*
93 * 'diff.<what>.funcname' attribute can be specified in the configuration
94 * to define a customized regexp to find the beginning of a function to
95 * be used for hunk header lines of "diff -p" style output.
96 */
97 static struct funcname_pattern {
98 char *name;
99 char *pattern;
100 struct funcname_pattern *next;
101 } *funcname_pattern_list;
103 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
104 {
105 const char *name;
106 int namelen;
107 struct funcname_pattern *pp;
109 name = var + 5; /* "diff." */
110 namelen = ep - name;
112 for (pp = funcname_pattern_list; pp; pp = pp->next)
113 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
114 break;
115 if (!pp) {
116 pp = xcalloc(1, sizeof(*pp));
117 pp->name = xmemdupz(name, namelen);
118 pp->next = funcname_pattern_list;
119 funcname_pattern_list = pp;
120 }
121 if (pp->pattern)
122 free(pp->pattern);
123 pp->pattern = xstrdup(value);
124 return 0;
125 }
127 /*
128 * These are to give UI layer defaults.
129 * The core-level commands such as git-diff-files should
130 * never be affected by the setting of diff.renames
131 * the user happens to have in the configuration file.
132 */
133 int git_diff_ui_config(const char *var, const char *value)
134 {
135 if (!strcmp(var, "diff.renamelimit")) {
136 diff_rename_limit_default = git_config_int(var, value);
137 return 0;
138 }
139 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
140 diff_use_color_default = git_config_colorbool(var, value, -1);
141 return 0;
142 }
143 if (!strcmp(var, "diff.renames")) {
144 if (!value)
145 diff_detect_rename_default = DIFF_DETECT_RENAME;
146 else if (!strcasecmp(value, "copies") ||
147 !strcasecmp(value, "copy"))
148 diff_detect_rename_default = DIFF_DETECT_COPY;
149 else if (git_config_bool(var,value))
150 diff_detect_rename_default = DIFF_DETECT_RENAME;
151 return 0;
152 }
153 if (!strcmp(var, "diff.autorefreshindex")) {
154 diff_auto_refresh_index = git_config_bool(var, value);
155 return 0;
156 }
157 if (!strcmp(var, "diff.external")) {
158 if (!value)
159 return config_error_nonbool(var);
160 external_diff_cmd_cfg = xstrdup(value);
161 return 0;
162 }
163 if (!prefixcmp(var, "diff.")) {
164 const char *ep = strrchr(var, '.');
166 if (ep != var + 4 && !strcmp(ep, ".command"))
167 return parse_lldiff_command(var, ep, value);
168 }
170 return git_diff_basic_config(var, value);
171 }
173 int git_diff_basic_config(const char *var, const char *value)
174 {
175 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
176 int slot = parse_diff_color_slot(var, 11);
177 if (!value)
178 return config_error_nonbool(var);
179 color_parse(value, var, diff_colors[slot]);
180 return 0;
181 }
183 if (!prefixcmp(var, "diff.")) {
184 const char *ep = strrchr(var, '.');
185 if (ep != var + 4) {
186 if (!strcmp(ep, ".funcname")) {
187 if (!value)
188 return config_error_nonbool(var);
189 return parse_funcname_pattern(var, ep, value);
190 }
191 }
192 }
194 return git_color_default_config(var, value);
195 }
197 static char *quote_two(const char *one, const char *two)
198 {
199 int need_one = quote_c_style(one, NULL, NULL, 1);
200 int need_two = quote_c_style(two, NULL, NULL, 1);
201 struct strbuf res;
203 strbuf_init(&res, 0);
204 if (need_one + need_two) {
205 strbuf_addch(&res, '"');
206 quote_c_style(one, &res, NULL, 1);
207 quote_c_style(two, &res, NULL, 1);
208 strbuf_addch(&res, '"');
209 } else {
210 strbuf_addstr(&res, one);
211 strbuf_addstr(&res, two);
212 }
213 return strbuf_detach(&res, NULL);
214 }
216 static const char *external_diff(void)
217 {
218 static const char *external_diff_cmd = NULL;
219 static int done_preparing = 0;
221 if (done_preparing)
222 return external_diff_cmd;
223 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
224 if (!external_diff_cmd)
225 external_diff_cmd = external_diff_cmd_cfg;
226 done_preparing = 1;
227 return external_diff_cmd;
228 }
230 static struct diff_tempfile {
231 const char *name; /* filename external diff should read from */
232 char hex[41];
233 char mode[10];
234 char tmp_path[PATH_MAX];
235 } diff_temp[2];
237 static int count_lines(const char *data, int size)
238 {
239 int count, ch, completely_empty = 1, nl_just_seen = 0;
240 count = 0;
241 while (0 < size--) {
242 ch = *data++;
243 if (ch == '\n') {
244 count++;
245 nl_just_seen = 1;
246 completely_empty = 0;
247 }
248 else {
249 nl_just_seen = 0;
250 completely_empty = 0;
251 }
252 }
253 if (completely_empty)
254 return 0;
255 if (!nl_just_seen)
256 count++; /* no trailing newline */
257 return count;
258 }
260 static void print_line_count(int count)
261 {
262 switch (count) {
263 case 0:
264 printf("0,0");
265 break;
266 case 1:
267 printf("1");
268 break;
269 default:
270 printf("1,%d", count);
271 break;
272 }
273 }
275 static void copy_file(int prefix, const char *data, int size,
276 const char *set, const char *reset)
277 {
278 int ch, nl_just_seen = 1;
279 while (0 < size--) {
280 ch = *data++;
281 if (nl_just_seen) {
282 fputs(set, stdout);
283 putchar(prefix);
284 }
285 if (ch == '\n') {
286 nl_just_seen = 1;
287 fputs(reset, stdout);
288 } else
289 nl_just_seen = 0;
290 putchar(ch);
291 }
292 if (!nl_just_seen)
293 printf("%s\n\\ No newline at end of file\n", reset);
294 }
296 static void emit_rewrite_diff(const char *name_a,
297 const char *name_b,
298 struct diff_filespec *one,
299 struct diff_filespec *two,
300 struct diff_options *o)
301 {
302 int lc_a, lc_b;
303 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
304 const char *name_a_tab, *name_b_tab;
305 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
306 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
307 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
308 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
309 const char *reset = diff_get_color(color_diff, DIFF_RESET);
310 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
312 name_a += (*name_a == '/');
313 name_b += (*name_b == '/');
314 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
315 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
317 strbuf_reset(&a_name);
318 strbuf_reset(&b_name);
319 quote_two_c_style(&a_name, o->a_prefix, name_a, 0);
320 quote_two_c_style(&b_name, o->b_prefix, name_b, 0);
322 diff_populate_filespec(one, 0);
323 diff_populate_filespec(two, 0);
324 lc_a = count_lines(one->data, one->size);
325 lc_b = count_lines(two->data, two->size);
326 printf("%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
327 metainfo, a_name.buf, name_a_tab, reset,
328 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
329 print_line_count(lc_a);
330 printf(" +");
331 print_line_count(lc_b);
332 printf(" @@%s\n", reset);
333 if (lc_a)
334 copy_file('-', one->data, one->size, old, reset);
335 if (lc_b)
336 copy_file('+', two->data, two->size, new, reset);
337 }
339 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
340 {
341 if (!DIFF_FILE_VALID(one)) {
342 mf->ptr = (char *)""; /* does not matter */
343 mf->size = 0;
344 return 0;
345 }
346 else if (diff_populate_filespec(one, 0))
347 return -1;
348 mf->ptr = one->data;
349 mf->size = one->size;
350 return 0;
351 }
353 struct diff_words_buffer {
354 mmfile_t text;
355 long alloc;
356 long current; /* output pointer */
357 int suppressed_newline;
358 };
360 static void diff_words_append(char *line, unsigned long len,
361 struct diff_words_buffer *buffer)
362 {
363 if (buffer->text.size + len > buffer->alloc) {
364 buffer->alloc = (buffer->text.size + len) * 3 / 2;
365 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
366 }
367 line++;
368 len--;
369 memcpy(buffer->text.ptr + buffer->text.size, line, len);
370 buffer->text.size += len;
371 }
373 struct diff_words_data {
374 struct xdiff_emit_state xm;
375 struct diff_words_buffer minus, plus;
376 };
378 static void print_word(struct diff_words_buffer *buffer, int len, int color,
379 int suppress_newline)
380 {
381 const char *ptr;
382 int eol = 0;
384 if (len == 0)
385 return;
387 ptr = buffer->text.ptr + buffer->current;
388 buffer->current += len;
390 if (ptr[len - 1] == '\n') {
391 eol = 1;
392 len--;
393 }
395 fputs(diff_get_color(1, color), stdout);
396 fwrite(ptr, len, 1, stdout);
397 fputs(diff_get_color(1, DIFF_RESET), stdout);
399 if (eol) {
400 if (suppress_newline)
401 buffer->suppressed_newline = 1;
402 else
403 putchar('\n');
404 }
405 }
407 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
408 {
409 struct diff_words_data *diff_words = priv;
411 if (diff_words->minus.suppressed_newline) {
412 if (line[0] != '+')
413 putchar('\n');
414 diff_words->minus.suppressed_newline = 0;
415 }
417 len--;
418 switch (line[0]) {
419 case '-':
420 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
421 break;
422 case '+':
423 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
424 break;
425 case ' ':
426 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
427 diff_words->minus.current += len;
428 break;
429 }
430 }
432 /* this executes the word diff on the accumulated buffers */
433 static void diff_words_show(struct diff_words_data *diff_words)
434 {
435 xpparam_t xpp;
436 xdemitconf_t xecfg;
437 xdemitcb_t ecb;
438 mmfile_t minus, plus;
439 int i;
441 memset(&xecfg, 0, sizeof(xecfg));
442 minus.size = diff_words->minus.text.size;
443 minus.ptr = xmalloc(minus.size);
444 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
445 for (i = 0; i < minus.size; i++)
446 if (isspace(minus.ptr[i]))
447 minus.ptr[i] = '\n';
448 diff_words->minus.current = 0;
450 plus.size = diff_words->plus.text.size;
451 plus.ptr = xmalloc(plus.size);
452 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
453 for (i = 0; i < plus.size; i++)
454 if (isspace(plus.ptr[i]))
455 plus.ptr[i] = '\n';
456 diff_words->plus.current = 0;
458 xpp.flags = XDF_NEED_MINIMAL;
459 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
460 ecb.outf = xdiff_outf;
461 ecb.priv = diff_words;
462 diff_words->xm.consume = fn_out_diff_words_aux;
463 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
465 free(minus.ptr);
466 free(plus.ptr);
467 diff_words->minus.text.size = diff_words->plus.text.size = 0;
469 if (diff_words->minus.suppressed_newline) {
470 putchar('\n');
471 diff_words->minus.suppressed_newline = 0;
472 }
473 }
475 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
477 struct emit_callback {
478 struct xdiff_emit_state xm;
479 int nparents, color_diff;
480 unsigned ws_rule;
481 sane_truncate_fn truncate;
482 const char **label_path;
483 struct diff_words_data *diff_words;
484 int *found_changesp;
485 };
487 static void free_diff_words_data(struct emit_callback *ecbdata)
488 {
489 if (ecbdata->diff_words) {
490 /* flush buffers */
491 if (ecbdata->diff_words->minus.text.size ||
492 ecbdata->diff_words->plus.text.size)
493 diff_words_show(ecbdata->diff_words);
495 if (ecbdata->diff_words->minus.text.ptr)
496 free (ecbdata->diff_words->minus.text.ptr);
497 if (ecbdata->diff_words->plus.text.ptr)
498 free (ecbdata->diff_words->plus.text.ptr);
499 free(ecbdata->diff_words);
500 ecbdata->diff_words = NULL;
501 }
502 }
504 const char *diff_get_color(int diff_use_color, enum color_diff ix)
505 {
506 if (diff_use_color)
507 return diff_colors[ix];
508 return "";
509 }
511 static void emit_line(const char *set, const char *reset, const char *line, int len)
512 {
513 fputs(set, stdout);
514 fwrite(line, len, 1, stdout);
515 fputs(reset, stdout);
516 }
518 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
519 {
520 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
521 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
523 if (!*ws)
524 emit_line(set, reset, line, len);
525 else {
526 /* Emit just the prefix, then the rest. */
527 emit_line(set, reset, line, ecbdata->nparents);
528 (void)check_and_emit_line(line + ecbdata->nparents,
529 len - ecbdata->nparents, ecbdata->ws_rule,
530 stdout, set, reset, ws);
531 }
532 }
534 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
535 {
536 const char *cp;
537 unsigned long allot;
538 size_t l = len;
540 if (ecb->truncate)
541 return ecb->truncate(line, len);
542 cp = line;
543 allot = l;
544 while (0 < l) {
545 (void) utf8_width(&cp, &l);
546 if (!cp)
547 break; /* truncated in the middle? */
548 }
549 return allot - l;
550 }
552 static void fn_out_consume(void *priv, char *line, unsigned long len)
553 {
554 int i;
555 int color;
556 struct emit_callback *ecbdata = priv;
557 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
558 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
559 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
561 *(ecbdata->found_changesp) = 1;
563 if (ecbdata->label_path[0]) {
564 const char *name_a_tab, *name_b_tab;
566 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
567 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
569 printf("%s--- %s%s%s\n",
570 meta, ecbdata->label_path[0], reset, name_a_tab);
571 printf("%s+++ %s%s%s\n",
572 meta, ecbdata->label_path[1], reset, name_b_tab);
573 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
574 }
576 /* This is not really necessary for now because
577 * this codepath only deals with two-way diffs.
578 */
579 for (i = 0; i < len && line[i] == '@'; i++)
580 ;
581 if (2 <= i && i < len && line[i] == ' ') {
582 ecbdata->nparents = i - 1;
583 len = sane_truncate_line(ecbdata, line, len);
584 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
585 reset, line, len);
586 if (line[len-1] != '\n')
587 putchar('\n');
588 return;
589 }
591 if (len < ecbdata->nparents) {
592 emit_line(reset, reset, line, len);
593 return;
594 }
596 color = DIFF_PLAIN;
597 if (ecbdata->diff_words && ecbdata->nparents != 1)
598 /* fall back to normal diff */
599 free_diff_words_data(ecbdata);
600 if (ecbdata->diff_words) {
601 if (line[0] == '-') {
602 diff_words_append(line, len,
603 &ecbdata->diff_words->minus);
604 return;
605 } else if (line[0] == '+') {
606 diff_words_append(line, len,
607 &ecbdata->diff_words->plus);
608 return;
609 }
610 if (ecbdata->diff_words->minus.text.size ||
611 ecbdata->diff_words->plus.text.size)
612 diff_words_show(ecbdata->diff_words);
613 line++;
614 len--;
615 emit_line(plain, reset, line, len);
616 return;
617 }
618 for (i = 0; i < ecbdata->nparents && len; i++) {
619 if (line[i] == '-')
620 color = DIFF_FILE_OLD;
621 else if (line[i] == '+')
622 color = DIFF_FILE_NEW;
623 }
625 if (color != DIFF_FILE_NEW) {
626 emit_line(diff_get_color(ecbdata->color_diff, color),
627 reset, line, len);
628 return;
629 }
630 emit_add_line(reset, ecbdata, line, len);
631 }
633 static char *pprint_rename(const char *a, const char *b)
634 {
635 const char *old = a;
636 const char *new = b;
637 struct strbuf name;
638 int pfx_length, sfx_length;
639 int len_a = strlen(a);
640 int len_b = strlen(b);
641 int a_midlen, b_midlen;
642 int qlen_a = quote_c_style(a, NULL, NULL, 0);
643 int qlen_b = quote_c_style(b, NULL, NULL, 0);
645 strbuf_init(&name, 0);
646 if (qlen_a || qlen_b) {
647 quote_c_style(a, &name, NULL, 0);
648 strbuf_addstr(&name, " => ");
649 quote_c_style(b, &name, NULL, 0);
650 return strbuf_detach(&name, NULL);
651 }
653 /* Find common prefix */
654 pfx_length = 0;
655 while (*old && *new && *old == *new) {
656 if (*old == '/')
657 pfx_length = old - a + 1;
658 old++;
659 new++;
660 }
662 /* Find common suffix */
663 old = a + len_a;
664 new = b + len_b;
665 sfx_length = 0;
666 while (a <= old && b <= new && *old == *new) {
667 if (*old == '/')
668 sfx_length = len_a - (old - a);
669 old--;
670 new--;
671 }
673 /*
674 * pfx{mid-a => mid-b}sfx
675 * {pfx-a => pfx-b}sfx
676 * pfx{sfx-a => sfx-b}
677 * name-a => name-b
678 */
679 a_midlen = len_a - pfx_length - sfx_length;
680 b_midlen = len_b - pfx_length - sfx_length;
681 if (a_midlen < 0)
682 a_midlen = 0;
683 if (b_midlen < 0)
684 b_midlen = 0;
686 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
687 if (pfx_length + sfx_length) {
688 strbuf_add(&name, a, pfx_length);
689 strbuf_addch(&name, '{');
690 }
691 strbuf_add(&name, a + pfx_length, a_midlen);
692 strbuf_addstr(&name, " => ");
693 strbuf_add(&name, b + pfx_length, b_midlen);
694 if (pfx_length + sfx_length) {
695 strbuf_addch(&name, '}');
696 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
697 }
698 return strbuf_detach(&name, NULL);
699 }
701 struct diffstat_t {
702 struct xdiff_emit_state xm;
704 int nr;
705 int alloc;
706 struct diffstat_file {
707 char *from_name;
708 char *name;
709 char *print_name;
710 unsigned is_unmerged:1;
711 unsigned is_binary:1;
712 unsigned is_renamed:1;
713 unsigned int added, deleted;
714 } **files;
715 };
717 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
718 const char *name_a,
719 const char *name_b)
720 {
721 struct diffstat_file *x;
722 x = xcalloc(sizeof (*x), 1);
723 if (diffstat->nr == diffstat->alloc) {
724 diffstat->alloc = alloc_nr(diffstat->alloc);
725 diffstat->files = xrealloc(diffstat->files,
726 diffstat->alloc * sizeof(x));
727 }
728 diffstat->files[diffstat->nr++] = x;
729 if (name_b) {
730 x->from_name = xstrdup(name_a);
731 x->name = xstrdup(name_b);
732 x->is_renamed = 1;
733 }
734 else {
735 x->from_name = NULL;
736 x->name = xstrdup(name_a);
737 }
738 return x;
739 }
741 static void diffstat_consume(void *priv, char *line, unsigned long len)
742 {
743 struct diffstat_t *diffstat = priv;
744 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
746 if (line[0] == '+')
747 x->added++;
748 else if (line[0] == '-')
749 x->deleted++;
750 }
752 const char mime_boundary_leader[] = "------------";
754 static int scale_linear(int it, int width, int max_change)
755 {
756 /*
757 * make sure that at least one '-' is printed if there were deletions,
758 * and likewise for '+'.
759 */
760 if (max_change < 2)
761 return it;
762 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
763 }
765 static void show_name(const char *prefix, const char *name, int len,
766 const char *reset, const char *set)
767 {
768 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
769 }
771 static void show_graph(char ch, int cnt, const char *set, const char *reset)
772 {
773 if (cnt <= 0)
774 return;
775 printf("%s", set);
776 while (cnt--)
777 putchar(ch);
778 printf("%s", reset);
779 }
781 static void fill_print_name(struct diffstat_file *file)
782 {
783 char *pname;
785 if (file->print_name)
786 return;
788 if (!file->is_renamed) {
789 struct strbuf buf;
790 strbuf_init(&buf, 0);
791 if (quote_c_style(file->name, &buf, NULL, 0)) {
792 pname = strbuf_detach(&buf, NULL);
793 } else {
794 pname = file->name;
795 strbuf_release(&buf);
796 }
797 } else {
798 pname = pprint_rename(file->from_name, file->name);
799 }
800 file->print_name = pname;
801 }
803 static void show_stats(struct diffstat_t* data, struct diff_options *options)
804 {
805 int i, len, add, del, total, adds = 0, dels = 0;
806 int max_change = 0, max_len = 0;
807 int total_files = data->nr;
808 int width, name_width;
809 const char *reset, *set, *add_c, *del_c;
811 if (data->nr == 0)
812 return;
814 width = options->stat_width ? options->stat_width : 80;
815 name_width = options->stat_name_width ? options->stat_name_width : 50;
817 /* Sanity: give at least 5 columns to the graph,
818 * but leave at least 10 columns for the name.
819 */
820 if (width < name_width + 15) {
821 if (name_width <= 25)
822 width = name_width + 15;
823 else
824 name_width = width - 15;
825 }
827 /* Find the longest filename and max number of changes */
828 reset = diff_get_color_opt(options, DIFF_RESET);
829 set = diff_get_color_opt(options, DIFF_PLAIN);
830 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
831 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
833 for (i = 0; i < data->nr; i++) {
834 struct diffstat_file *file = data->files[i];
835 int change = file->added + file->deleted;
836 fill_print_name(file);
837 len = strlen(file->print_name);
838 if (max_len < len)
839 max_len = len;
841 if (file->is_binary || file->is_unmerged)
842 continue;
843 if (max_change < change)
844 max_change = change;
845 }
847 /* Compute the width of the graph part;
848 * 10 is for one blank at the beginning of the line plus
849 * " | count " between the name and the graph.
850 *
851 * From here on, name_width is the width of the name area,
852 * and width is the width of the graph area.
853 */
854 name_width = (name_width < max_len) ? name_width : max_len;
855 if (width < (name_width + 10) + max_change)
856 width = width - (name_width + 10);
857 else
858 width = max_change;
860 for (i = 0; i < data->nr; i++) {
861 const char *prefix = "";
862 char *name = data->files[i]->print_name;
863 int added = data->files[i]->added;
864 int deleted = data->files[i]->deleted;
865 int name_len;
867 /*
868 * "scale" the filename
869 */
870 len = name_width;
871 name_len = strlen(name);
872 if (name_width < name_len) {
873 char *slash;
874 prefix = "...";
875 len -= 3;
876 name += name_len - len;
877 slash = strchr(name, '/');
878 if (slash)
879 name = slash;
880 }
882 if (data->files[i]->is_binary) {
883 show_name(prefix, name, len, reset, set);
884 printf(" Bin ");
885 printf("%s%d%s", del_c, deleted, reset);
886 printf(" -> ");
887 printf("%s%d%s", add_c, added, reset);
888 printf(" bytes");
889 printf("\n");
890 continue;
891 }
892 else if (data->files[i]->is_unmerged) {
893 show_name(prefix, name, len, reset, set);
894 printf(" Unmerged\n");
895 continue;
896 }
897 else if (!data->files[i]->is_renamed &&
898 (added + deleted == 0)) {
899 total_files--;
900 continue;
901 }
903 /*
904 * scale the add/delete
905 */
906 add = added;
907 del = deleted;
908 total = add + del;
909 adds += add;
910 dels += del;
912 if (width <= max_change) {
913 add = scale_linear(add, width, max_change);
914 del = scale_linear(del, width, max_change);
915 total = add + del;
916 }
917 show_name(prefix, name, len, reset, set);
918 printf("%5d ", added + deleted);
919 show_graph('+', add, add_c, reset);
920 show_graph('-', del, del_c, reset);
921 putchar('\n');
922 }
923 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
924 set, total_files, adds, dels, reset);
925 }
927 static void show_shortstats(struct diffstat_t* data)
928 {
929 int i, adds = 0, dels = 0, total_files = data->nr;
931 if (data->nr == 0)
932 return;
934 for (i = 0; i < data->nr; i++) {
935 if (!data->files[i]->is_binary &&
936 !data->files[i]->is_unmerged) {
937 int added = data->files[i]->added;
938 int deleted= data->files[i]->deleted;
939 if (!data->files[i]->is_renamed &&
940 (added + deleted == 0)) {
941 total_files--;
942 } else {
943 adds += added;
944 dels += deleted;
945 }
946 }
947 }
948 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
949 total_files, adds, dels);
950 }
952 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
953 {
954 int i;
956 if (data->nr == 0)
957 return;
959 for (i = 0; i < data->nr; i++) {
960 struct diffstat_file *file = data->files[i];
962 if (file->is_binary)
963 printf("-\t-\t");
964 else
965 printf("%d\t%d\t", file->added, file->deleted);
966 if (options->line_termination) {
967 fill_print_name(file);
968 if (!file->is_renamed)
969 write_name_quoted(file->name, stdout,
970 options->line_termination);
971 else {
972 fputs(file->print_name, stdout);
973 putchar(options->line_termination);
974 }
975 } else {
976 if (file->is_renamed) {
977 putchar('\0');
978 write_name_quoted(file->from_name, stdout, '\0');
979 }
980 write_name_quoted(file->name, stdout, '\0');
981 }
982 }
983 }
985 struct diffstat_dir {
986 struct diffstat_file **files;
987 int nr, percent, cumulative;
988 };
990 static long gather_dirstat(struct diffstat_dir *dir, unsigned long changed, const char *base, int baselen)
991 {
992 unsigned long this_dir = 0;
993 unsigned int sources = 0;
995 while (dir->nr) {
996 struct diffstat_file *f = *dir->files;
997 int namelen = strlen(f->name);
998 unsigned long this;
999 char *slash;
1001 if (namelen < baselen)
1002 break;
1003 if (memcmp(f->name, base, baselen))
1004 break;
1005 slash = strchr(f->name + baselen, '/');
1006 if (slash) {
1007 int newbaselen = slash + 1 - f->name;
1008 this = gather_dirstat(dir, changed, f->name, newbaselen);
1009 sources++;
1010 } else {
1011 if (f->is_unmerged || f->is_binary)
1012 this = 0;
1013 else
1014 this = f->added + f->deleted;
1015 dir->files++;
1016 dir->nr--;
1017 sources += 2;
1018 }
1019 this_dir += this;
1020 }
1022 /*
1023 * We don't report dirstat's for
1024 * - the top level
1025 * - or cases where everything came from a single directory
1026 * under this directory (sources == 1).
1027 */
1028 if (baselen && sources != 1) {
1029 int permille = this_dir * 1000 / changed;
1030 if (permille) {
1031 int percent = permille / 10;
1032 if (percent >= dir->percent) {
1033 printf("%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1034 if (!dir->cumulative)
1035 return 0;
1036 }
1037 }
1038 }
1039 return this_dir;
1040 }
1042 static void show_dirstat(struct diffstat_t *data, struct diff_options *options)
1043 {
1044 int i;
1045 unsigned long changed;
1046 struct diffstat_dir dir;
1048 /* Calculate total changes */
1049 changed = 0;
1050 for (i = 0; i < data->nr; i++) {
1051 if (data->files[i]->is_binary || data->files[i]->is_unmerged)
1052 continue;
1053 changed += data->files[i]->added;
1054 changed += data->files[i]->deleted;
1055 }
1057 /* This can happen even with many files, if everything was renames */
1058 if (!changed)
1059 return;
1061 /* Show all directories with more than x% of the changes */
1062 dir.files = data->files;
1063 dir.nr = data->nr;
1064 dir.percent = options->dirstat_percent;
1065 dir.cumulative = options->output_format & DIFF_FORMAT_CUMULATIVE;
1066 gather_dirstat(&dir, changed, "", 0);
1067 }
1069 static void free_diffstat_info(struct diffstat_t *diffstat)
1070 {
1071 int i;
1072 for (i = 0; i < diffstat->nr; i++) {
1073 struct diffstat_file *f = diffstat->files[i];
1074 if (f->name != f->print_name)
1075 free(f->print_name);
1076 free(f->name);
1077 free(f->from_name);
1078 free(f);
1079 }
1080 free(diffstat->files);
1081 }
1083 struct checkdiff_t {
1084 struct xdiff_emit_state xm;
1085 const char *filename;
1086 int lineno, color_diff;
1087 unsigned ws_rule;
1088 unsigned status;
1089 };
1091 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1092 {
1093 struct checkdiff_t *data = priv;
1094 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1095 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1096 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
1097 char *err;
1099 if (line[0] == '+') {
1100 data->lineno++;
1101 data->status = check_and_emit_line(line + 1, len - 1,
1102 data->ws_rule, NULL, NULL, NULL, NULL);
1103 if (!data->status)
1104 return;
1105 err = whitespace_error_string(data->status);
1106 printf("%s:%d: %s.\n", data->filename, data->lineno, err);
1107 free(err);
1108 emit_line(set, reset, line, 1);
1109 (void)check_and_emit_line(line + 1, len - 1, data->ws_rule,
1110 stdout, set, reset, ws);
1111 } else if (line[0] == ' ')
1112 data->lineno++;
1113 else if (line[0] == '@') {
1114 char *plus = strchr(line, '+');
1115 if (plus)
1116 data->lineno = strtol(plus, NULL, 10) - 1;
1117 else
1118 die("invalid diff");
1119 }
1120 }
1122 static unsigned char *deflate_it(char *data,
1123 unsigned long size,
1124 unsigned long *result_size)
1125 {
1126 int bound;
1127 unsigned char *deflated;
1128 z_stream stream;
1130 memset(&stream, 0, sizeof(stream));
1131 deflateInit(&stream, zlib_compression_level);
1132 bound = deflateBound(&stream, size);
1133 deflated = xmalloc(bound);
1134 stream.next_out = deflated;
1135 stream.avail_out = bound;
1137 stream.next_in = (unsigned char *)data;
1138 stream.avail_in = size;
1139 while (deflate(&stream, Z_FINISH) == Z_OK)
1140 ; /* nothing */
1141 deflateEnd(&stream);
1142 *result_size = stream.total_out;
1143 return deflated;
1144 }
1146 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1147 {
1148 void *cp;
1149 void *delta;
1150 void *deflated;
1151 void *data;
1152 unsigned long orig_size;
1153 unsigned long delta_size;
1154 unsigned long deflate_size;
1155 unsigned long data_size;
1157 /* We could do deflated delta, or we could do just deflated two,
1158 * whichever is smaller.
1159 */
1160 delta = NULL;
1161 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1162 if (one->size && two->size) {
1163 delta = diff_delta(one->ptr, one->size,
1164 two->ptr, two->size,
1165 &delta_size, deflate_size);
1166 if (delta) {
1167 void *to_free = delta;
1168 orig_size = delta_size;
1169 delta = deflate_it(delta, delta_size, &delta_size);
1170 free(to_free);
1171 }
1172 }
1174 if (delta && delta_size < deflate_size) {
1175 printf("delta %lu\n", orig_size);
1176 free(deflated);
1177 data = delta;
1178 data_size = delta_size;
1179 }
1180 else {
1181 printf("literal %lu\n", two->size);
1182 free(delta);
1183 data = deflated;
1184 data_size = deflate_size;
1185 }
1187 /* emit data encoded in base85 */
1188 cp = data;
1189 while (data_size) {
1190 int bytes = (52 < data_size) ? 52 : data_size;
1191 char line[70];
1192 data_size -= bytes;
1193 if (bytes <= 26)
1194 line[0] = bytes + 'A' - 1;
1195 else
1196 line[0] = bytes - 26 + 'a' - 1;
1197 encode_85(line + 1, cp, bytes);
1198 cp = (char *) cp + bytes;
1199 puts(line);
1200 }
1201 printf("\n");
1202 free(data);
1203 }
1205 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1206 {
1207 printf("GIT binary patch\n");
1208 emit_binary_diff_body(one, two);
1209 emit_binary_diff_body(two, one);
1210 }
1212 static void setup_diff_attr_check(struct git_attr_check *check)
1213 {
1214 static struct git_attr *attr_diff;
1216 if (!attr_diff) {
1217 attr_diff = git_attr("diff", 4);
1218 }
1219 check[0].attr = attr_diff;
1220 }
1222 static void diff_filespec_check_attr(struct diff_filespec *one)
1223 {
1224 struct git_attr_check attr_diff_check;
1225 int check_from_data = 0;
1227 if (one->checked_attr)
1228 return;
1230 setup_diff_attr_check(&attr_diff_check);
1231 one->is_binary = 0;
1232 one->funcname_pattern_ident = NULL;
1234 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1235 const char *value;
1237 /* binaryness */
1238 value = attr_diff_check.value;
1239 if (ATTR_TRUE(value))
1240 ;
1241 else if (ATTR_FALSE(value))
1242 one->is_binary = 1;
1243 else
1244 check_from_data = 1;
1246 /* funcname pattern ident */
1247 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1248 ;
1249 else
1250 one->funcname_pattern_ident = value;
1251 }
1253 if (check_from_data) {
1254 if (!one->data && DIFF_FILE_VALID(one))
1255 diff_populate_filespec(one, 0);
1257 if (one->data)
1258 one->is_binary = buffer_is_binary(one->data, one->size);
1259 }
1260 }
1262 int diff_filespec_is_binary(struct diff_filespec *one)
1263 {
1264 diff_filespec_check_attr(one);
1265 return one->is_binary;
1266 }
1268 static const char *funcname_pattern(const char *ident)
1269 {
1270 struct funcname_pattern *pp;
1272 for (pp = funcname_pattern_list; pp; pp = pp->next)
1273 if (!strcmp(ident, pp->name))
1274 return pp->pattern;
1275 return NULL;
1276 }
1278 static struct builtin_funcname_pattern {
1279 const char *name;
1280 const char *pattern;
1281 } builtin_funcname_pattern[] = {
1282 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1283 "new\\|return\\|switch\\|throw\\|while\\)\n"
1284 "^[ ]*\\(\\([ ]*"
1285 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1286 "[ ]*([^;]*\\)$" },
1287 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1288 };
1290 static const char *diff_funcname_pattern(struct diff_filespec *one)
1291 {
1292 const char *ident, *pattern;
1293 int i;
1295 diff_filespec_check_attr(one);
1296 ident = one->funcname_pattern_ident;
1298 if (!ident)
1299 /*
1300 * If the config file has "funcname.default" defined, that
1301 * regexp is used; otherwise NULL is returned and xemit uses
1302 * the built-in default.
1303 */
1304 return funcname_pattern("default");
1306 /* Look up custom "funcname.$ident" regexp from config. */
1307 pattern = funcname_pattern(ident);
1308 if (pattern)
1309 return pattern;
1311 /*
1312 * And define built-in fallback patterns here. Note that
1313 * these can be overridden by the user's config settings.
1314 */
1315 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1316 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1317 return builtin_funcname_pattern[i].pattern;
1319 return NULL;
1320 }
1322 static void builtin_diff(const char *name_a,
1323 const char *name_b,
1324 struct diff_filespec *one,
1325 struct diff_filespec *two,
1326 const char *xfrm_msg,
1327 struct diff_options *o,
1328 int complete_rewrite)
1329 {
1330 mmfile_t mf1, mf2;
1331 const char *lbl[2];
1332 char *a_one, *b_two;
1333 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1334 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1336 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1337 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
1338 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1339 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1340 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1341 if (lbl[0][0] == '/') {
1342 /* /dev/null */
1343 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1344 if (xfrm_msg && xfrm_msg[0])
1345 printf("%s%s%s\n", set, xfrm_msg, reset);
1346 }
1347 else if (lbl[1][0] == '/') {
1348 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1349 if (xfrm_msg && xfrm_msg[0])
1350 printf("%s%s%s\n", set, xfrm_msg, reset);
1351 }
1352 else {
1353 if (one->mode != two->mode) {
1354 printf("%sold mode %06o%s\n", set, one->mode, reset);
1355 printf("%snew mode %06o%s\n", set, two->mode, reset);
1356 }
1357 if (xfrm_msg && xfrm_msg[0])
1358 printf("%s%s%s\n", set, xfrm_msg, reset);
1359 /*
1360 * we do not run diff between different kind
1361 * of objects.
1362 */
1363 if ((one->mode ^ two->mode) & S_IFMT)
1364 goto free_ab_and_return;
1365 if (complete_rewrite) {
1366 emit_rewrite_diff(name_a, name_b, one, two, o);
1367 o->found_changes = 1;
1368 goto free_ab_and_return;
1369 }
1370 }
1372 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1373 die("unable to read files to diff");
1375 if (!DIFF_OPT_TST(o, TEXT) &&
1376 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1377 /* Quite common confusing case */
1378 if (mf1.size == mf2.size &&
1379 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1380 goto free_ab_and_return;
1381 if (DIFF_OPT_TST(o, BINARY))
1382 emit_binary_diff(&mf1, &mf2);
1383 else
1384 printf("Binary files %s and %s differ\n",
1385 lbl[0], lbl[1]);
1386 o->found_changes = 1;
1387 }
1388 else {
1389 /* Crazy xdl interfaces.. */
1390 const char *diffopts = getenv("GIT_DIFF_OPTS");
1391 xpparam_t xpp;
1392 xdemitconf_t xecfg;
1393 xdemitcb_t ecb;
1394 struct emit_callback ecbdata;
1395 const char *funcname_pattern;
1397 funcname_pattern = diff_funcname_pattern(one);
1398 if (!funcname_pattern)
1399 funcname_pattern = diff_funcname_pattern(two);
1401 memset(&xecfg, 0, sizeof(xecfg));
1402 memset(&ecbdata, 0, sizeof(ecbdata));
1403 ecbdata.label_path = lbl;
1404 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1405 ecbdata.found_changesp = &o->found_changes;
1406 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1407 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1408 xecfg.ctxlen = o->context;
1409 xecfg.flags = XDL_EMIT_FUNCNAMES;
1410 if (funcname_pattern)
1411 xdiff_set_find_func(&xecfg, funcname_pattern);
1412 if (!diffopts)
1413 ;
1414 else if (!prefixcmp(diffopts, "--unified="))
1415 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1416 else if (!prefixcmp(diffopts, "-u"))
1417 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1418 ecb.outf = xdiff_outf;
1419 ecb.priv = &ecbdata;
1420 ecbdata.xm.consume = fn_out_consume;
1421 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1422 ecbdata.diff_words =
1423 xcalloc(1, sizeof(struct diff_words_data));
1424 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1425 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1426 free_diff_words_data(&ecbdata);
1427 }
1429 free_ab_and_return:
1430 diff_free_filespec_data(one);
1431 diff_free_filespec_data(two);
1432 free(a_one);
1433 free(b_two);
1434 return;
1435 }
1437 static void builtin_diffstat(const char *name_a, const char *name_b,
1438 struct diff_filespec *one,
1439 struct diff_filespec *two,
1440 struct diffstat_t *diffstat,
1441 struct diff_options *o,
1442 int complete_rewrite)
1443 {
1444 mmfile_t mf1, mf2;
1445 struct diffstat_file *data;
1447 data = diffstat_add(diffstat, name_a, name_b);
1449 if (!one || !two) {
1450 data->is_unmerged = 1;
1451 return;
1452 }
1453 if (complete_rewrite) {
1454 diff_populate_filespec(one, 0);
1455 diff_populate_filespec(two, 0);
1456 data->deleted = count_lines(one->data, one->size);
1457 data->added = count_lines(two->data, two->size);
1458 goto free_and_return;
1459 }
1460 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1461 die("unable to read files to diff");
1463 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1464 data->is_binary = 1;
1465 data->added = mf2.size;
1466 data->deleted = mf1.size;
1467 } else {
1468 /* Crazy xdl interfaces.. */
1469 xpparam_t xpp;
1470 xdemitconf_t xecfg;
1471 xdemitcb_t ecb;
1473 memset(&xecfg, 0, sizeof(xecfg));
1474 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1475 ecb.outf = xdiff_outf;
1476 ecb.priv = diffstat;
1477 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1478 }
1480 free_and_return:
1481 diff_free_filespec_data(one);
1482 diff_free_filespec_data(two);
1483 }
1485 static void builtin_checkdiff(const char *name_a, const char *name_b,
1486 struct diff_filespec *one,
1487 struct diff_filespec *two, struct diff_options *o)
1488 {
1489 mmfile_t mf1, mf2;
1490 struct checkdiff_t data;
1492 if (!two)
1493 return;
1495 memset(&data, 0, sizeof(data));
1496 data.xm.consume = checkdiff_consume;
1497 data.filename = name_b ? name_b : name_a;
1498 data.lineno = 0;
1499 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1500 data.ws_rule = whitespace_rule(data.filename);
1502 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1503 die("unable to read files to diff");
1505 if (diff_filespec_is_binary(two))
1506 goto free_and_return;
1507 else {
1508 /* Crazy xdl interfaces.. */
1509 xpparam_t xpp;
1510 xdemitconf_t xecfg;
1511 xdemitcb_t ecb;
1513 memset(&xecfg, 0, sizeof(xecfg));
1514 xpp.flags = XDF_NEED_MINIMAL;
1515 ecb.outf = xdiff_outf;
1516 ecb.priv = &data;
1517 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1518 }
1519 free_and_return:
1520 diff_free_filespec_data(one);
1521 diff_free_filespec_data(two);
1522 if (data.status)
1523 DIFF_OPT_SET(o, CHECK_FAILED);
1524 }
1526 struct diff_filespec *alloc_filespec(const char *path)
1527 {
1528 int namelen = strlen(path);
1529 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1531 memset(spec, 0, sizeof(*spec));
1532 spec->path = (char *)(spec + 1);
1533 memcpy(spec->path, path, namelen+1);
1534 spec->count = 1;
1535 return spec;
1536 }
1538 void free_filespec(struct diff_filespec *spec)
1539 {
1540 if (!--spec->count) {
1541 diff_free_filespec_data(spec);
1542 free(spec);
1543 }
1544 }
1546 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1547 unsigned short mode)
1548 {
1549 if (mode) {
1550 spec->mode = canon_mode(mode);
1551 hashcpy(spec->sha1, sha1);
1552 spec->sha1_valid = !is_null_sha1(sha1);
1553 }
1554 }
1556 /*
1557 * Given a name and sha1 pair, if the index tells us the file in
1558 * the work tree has that object contents, return true, so that
1559 * prepare_temp_file() does not have to inflate and extract.
1560 */
1561 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1562 {
1563 struct cache_entry *ce;
1564 struct stat st;
1565 int pos, len;
1567 /* We do not read the cache ourselves here, because the
1568 * benchmark with my previous version that always reads cache
1569 * shows that it makes things worse for diff-tree comparing
1570 * two linux-2.6 kernel trees in an already checked out work
1571 * tree. This is because most diff-tree comparisons deal with
1572 * only a small number of files, while reading the cache is
1573 * expensive for a large project, and its cost outweighs the
1574 * savings we get by not inflating the object to a temporary
1575 * file. Practically, this code only helps when we are used
1576 * by diff-cache --cached, which does read the cache before
1577 * calling us.
1578 */
1579 if (!active_cache)
1580 return 0;
1582 /* We want to avoid the working directory if our caller
1583 * doesn't need the data in a normal file, this system
1584 * is rather slow with its stat/open/mmap/close syscalls,
1585 * and the object is contained in a pack file. The pack
1586 * is probably already open and will be faster to obtain
1587 * the data through than the working directory. Loose
1588 * objects however would tend to be slower as they need
1589 * to be individually opened and inflated.
1590 */
1591 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1592 return 0;
1594 len = strlen(name);
1595 pos = cache_name_pos(name, len);
1596 if (pos < 0)
1597 return 0;
1598 ce = active_cache[pos];
1600 /*
1601 * This is not the sha1 we are looking for, or
1602 * unreusable because it is not a regular file.
1603 */
1604 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1605 return 0;
1607 /*
1608 * If ce matches the file in the work tree, we can reuse it.
1609 */
1610 if (ce_uptodate(ce) ||
1611 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1612 return 1;
1614 return 0;
1615 }
1617 static int populate_from_stdin(struct diff_filespec *s)
1618 {
1619 struct strbuf buf;
1620 size_t size = 0;
1622 strbuf_init(&buf, 0);
1623 if (strbuf_read(&buf, 0, 0) < 0)
1624 return error("error while reading from stdin %s",
1625 strerror(errno));
1627 s->should_munmap = 0;
1628 s->data = strbuf_detach(&buf, &size);
1629 s->size = size;
1630 s->should_free = 1;
1631 return 0;
1632 }
1634 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1635 {
1636 int len;
1637 char *data = xmalloc(100);
1638 len = snprintf(data, 100,
1639 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1640 s->data = data;
1641 s->size = len;
1642 s->should_free = 1;
1643 if (size_only) {
1644 s->data = NULL;
1645 free(data);
1646 }
1647 return 0;
1648 }
1650 /*
1651 * While doing rename detection and pickaxe operation, we may need to
1652 * grab the data for the blob (or file) for our own in-core comparison.
1653 * diff_filespec has data and size fields for this purpose.
1654 */
1655 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1656 {
1657 int err = 0;
1658 if (!DIFF_FILE_VALID(s))
1659 die("internal error: asking to populate invalid file.");
1660 if (S_ISDIR(s->mode))
1661 return -1;
1663 if (s->data)
1664 return 0;
1666 if (size_only && 0 < s->size)
1667 return 0;
1669 if (S_ISGITLINK(s->mode))
1670 return diff_populate_gitlink(s, size_only);
1672 if (!s->sha1_valid ||
1673 reuse_worktree_file(s->path, s->sha1, 0)) {
1674 struct strbuf buf;
1675 struct stat st;
1676 int fd;
1678 if (!strcmp(s->path, "-"))
1679 return populate_from_stdin(s);
1681 if (lstat(s->path, &st) < 0) {
1682 if (errno == ENOENT) {
1683 err_empty:
1684 err = -1;
1685 empty:
1686 s->data = (char *)"";
1687 s->size = 0;
1688 return err;
1689 }
1690 }
1691 s->size = xsize_t(st.st_size);
1692 if (!s->size)
1693 goto empty;
1694 if (size_only)
1695 return 0;
1696 if (S_ISLNK(st.st_mode)) {
1697 int ret;
1698 s->data = xmalloc(s->size);
1699 s->should_free = 1;
1700 ret = readlink(s->path, s->data, s->size);
1701 if (ret < 0) {
1702 free(s->data);
1703 goto err_empty;
1704 }
1705 return 0;
1706 }
1707 fd = open(s->path, O_RDONLY);
1708 if (fd < 0)
1709 goto err_empty;
1710 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1711 close(fd);
1712 s->should_munmap = 1;
1714 /*
1715 * Convert from working tree format to canonical git format
1716 */
1717 strbuf_init(&buf, 0);
1718 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
1719 size_t size = 0;
1720 munmap(s->data, s->size);
1721 s->should_munmap = 0;
1722 s->data = strbuf_detach(&buf, &size);
1723 s->size = size;
1724 s->should_free = 1;
1725 }
1726 }
1727 else {
1728 enum object_type type;
1729 if (size_only)
1730 type = sha1_object_info(s->sha1, &s->size);
1731 else {
1732 s->data = read_sha1_file(s->sha1, &type, &s->size);
1733 s->should_free = 1;
1734 }
1735 }
1736 return 0;
1737 }
1739 void diff_free_filespec_blob(struct diff_filespec *s)
1740 {
1741 if (s->should_free)
1742 free(s->data);
1743 else if (s->should_munmap)
1744 munmap(s->data, s->size);
1746 if (s->should_free || s->should_munmap) {
1747 s->should_free = s->should_munmap = 0;
1748 s->data = NULL;
1749 }
1750 }
1752 void diff_free_filespec_data(struct diff_filespec *s)
1753 {
1754 diff_free_filespec_blob(s);
1755 free(s->cnt_data);
1756 s->cnt_data = NULL;
1757 }
1759 static void prep_temp_blob(struct diff_tempfile *temp,
1760 void *blob,
1761 unsigned long size,
1762 const unsigned char *sha1,
1763 int mode)
1764 {
1765 int fd;
1767 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1768 if (fd < 0)
1769 die("unable to create temp-file: %s", strerror(errno));
1770 if (write_in_full(fd, blob, size) != size)
1771 die("unable to write temp-file");
1772 close(fd);
1773 temp->name = temp->tmp_path;
1774 strcpy(temp->hex, sha1_to_hex(sha1));
1775 temp->hex[40] = 0;
1776 sprintf(temp->mode, "%06o", mode);
1777 }
1779 static void prepare_temp_file(const char *name,
1780 struct diff_tempfile *temp,
1781 struct diff_filespec *one)
1782 {
1783 if (!DIFF_FILE_VALID(one)) {
1784 not_a_valid_file:
1785 /* A '-' entry produces this for file-2, and
1786 * a '+' entry produces this for file-1.
1787 */
1788 temp->name = "/dev/null";
1789 strcpy(temp->hex, ".");
1790 strcpy(temp->mode, ".");
1791 return;
1792 }
1794 if (!one->sha1_valid ||
1795 reuse_worktree_file(name, one->sha1, 1)) {
1796 struct stat st;
1797 if (lstat(name, &st) < 0) {
1798 if (errno == ENOENT)
1799 goto not_a_valid_file;
1800 die("stat(%s): %s", name, strerror(errno));
1801 }
1802 if (S_ISLNK(st.st_mode)) {
1803 int ret;
1804 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1805 size_t sz = xsize_t(st.st_size);
1806 if (sizeof(buf) <= st.st_size)
1807 die("symlink too long: %s", name);
1808 ret = readlink(name, buf, sz);
1809 if (ret < 0)
1810 die("readlink(%s)", name);
1811 prep_temp_blob(temp, buf, sz,
1812 (one->sha1_valid ?
1813 one->sha1 : null_sha1),
1814 (one->sha1_valid ?
1815 one->mode : S_IFLNK));
1816 }
1817 else {
1818 /* we can borrow from the file in the work tree */
1819 temp->name = name;
1820 if (!one->sha1_valid)
1821 strcpy(temp->hex, sha1_to_hex(null_sha1));
1822 else
1823 strcpy(temp->hex, sha1_to_hex(one->sha1));
1824 /* Even though we may sometimes borrow the
1825 * contents from the work tree, we always want
1826 * one->mode. mode is trustworthy even when
1827 * !(one->sha1_valid), as long as
1828 * DIFF_FILE_VALID(one).
1829 */
1830 sprintf(temp->mode, "%06o", one->mode);
1831 }
1832 return;
1833 }
1834 else {
1835 if (diff_populate_filespec(one, 0))
1836 die("cannot read data blob for %s", one->path);
1837 prep_temp_blob(temp, one->data, one->size,
1838 one->sha1, one->mode);
1839 }
1840 }
1842 static void remove_tempfile(void)
1843 {
1844 int i;
1846 for (i = 0; i < 2; i++)
1847 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1848 unlink(diff_temp[i].name);
1849 diff_temp[i].name = NULL;
1850 }
1851 }
1853 static void remove_tempfile_on_signal(int signo)
1854 {
1855 remove_tempfile();
1856 signal(SIGINT, SIG_DFL);
1857 raise(signo);
1858 }
1860 /* An external diff command takes:
1861 *
1862 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1863 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1864 *
1865 */
1866 static void run_external_diff(const char *pgm,
1867 const char *name,
1868 const char *other,
1869 struct diff_filespec *one,
1870 struct diff_filespec *two,
1871 const char *xfrm_msg,
1872 int complete_rewrite)
1873 {
1874 const char *spawn_arg[10];
1875 struct diff_tempfile *temp = diff_temp;
1876 int retval;
1877 static int atexit_asked = 0;
1878 const char *othername;
1879 const char **arg = &spawn_arg[0];
1881 othername = (other? other : name);
1882 if (one && two) {
1883 prepare_temp_file(name, &temp[0], one);
1884 prepare_temp_file(othername, &temp[1], two);
1885 if (! atexit_asked &&
1886 (temp[0].name == temp[0].tmp_path ||
1887 temp[1].name == temp[1].tmp_path)) {
1888 atexit_asked = 1;
1889 atexit(remove_tempfile);
1890 }
1891 signal(SIGINT, remove_tempfile_on_signal);
1892 }
1894 if (one && two) {
1895 *arg++ = pgm;
1896 *arg++ = name;
1897 *arg++ = temp[0].name;
1898 *arg++ = temp[0].hex;
1899 *arg++ = temp[0].mode;
1900 *arg++ = temp[1].name;
1901 *arg++ = temp[1].hex;
1902 *arg++ = temp[1].mode;
1903 if (other) {
1904 *arg++ = other;
1905 *arg++ = xfrm_msg;
1906 }
1907 } else {
1908 *arg++ = pgm;
1909 *arg++ = name;
1910 }
1911 *arg = NULL;
1912 fflush(NULL);
1913 retval = run_command_v_opt(spawn_arg, 0);
1914 remove_tempfile();
1915 if (retval) {
1916 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1917 exit(1);
1918 }
1919 }
1921 static const char *external_diff_attr(const char *name)
1922 {
1923 struct git_attr_check attr_diff_check;
1925 setup_diff_attr_check(&attr_diff_check);
1926 if (!git_checkattr(name, 1, &attr_diff_check)) {
1927 const char *value = attr_diff_check.value;
1928 if (!ATTR_TRUE(value) &&
1929 !ATTR_FALSE(value) &&
1930 !ATTR_UNSET(value)) {
1931 struct ll_diff_driver *drv;
1933 for (drv = user_diff; drv; drv = drv->next)
1934 if (!strcmp(drv->name, value))
1935 return drv->cmd;
1936 }
1937 }
1938 return NULL;
1939 }
1941 static void run_diff_cmd(const char *pgm,
1942 const char *name,
1943 const char *other,
1944 struct diff_filespec *one,
1945 struct diff_filespec *two,
1946 const char *xfrm_msg,
1947 struct diff_options *o,
1948 int complete_rewrite)
1949 {
1950 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
1951 pgm = NULL;
1952 else {
1953 const char *cmd = external_diff_attr(name);
1954 if (cmd)
1955 pgm = cmd;
1956 }
1958 if (pgm) {
1959 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1960 complete_rewrite);
1961 return;
1962 }
1963 if (one && two)
1964 builtin_diff(name, other ? other : name,
1965 one, two, xfrm_msg, o, complete_rewrite);
1966 else
1967 printf("* Unmerged path %s\n", name);
1968 }
1970 static void diff_fill_sha1_info(struct diff_filespec *one)
1971 {
1972 if (DIFF_FILE_VALID(one)) {
1973 if (!one->sha1_valid) {
1974 struct stat st;
1975 if (!strcmp(one->path, "-")) {
1976 hashcpy(one->sha1, null_sha1);
1977 return;
1978 }
1979 if (lstat(one->path, &st) < 0)
1980 die("stat %s", one->path);
1981 if (index_path(one->sha1, one->path, &st, 0))
1982 die("cannot hash %s\n", one->path);
1983 }
1984 }
1985 else
1986 hashclr(one->sha1);
1987 }
1989 static int similarity_index(struct diff_filepair *p)
1990 {
1991 return p->score * 100 / MAX_SCORE;
1992 }
1994 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1995 {
1996 const char *pgm = external_diff();
1997 struct strbuf msg;
1998 char *xfrm_msg;
1999 struct diff_filespec *one = p->one;
2000 struct diff_filespec *two = p->two;
2001 const char *name;
2002 const char *other;
2003 int complete_rewrite = 0;
2006 if (DIFF_PAIR_UNMERGED(p)) {
2007 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
2008 return;
2009 }
2011 name = p->one->path;
2012 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2013 diff_fill_sha1_info(one);
2014 diff_fill_sha1_info(two);
2016 strbuf_init(&msg, PATH_MAX * 2 + 300);
2017 switch (p->status) {
2018 case DIFF_STATUS_COPIED:
2019 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2020 strbuf_addstr(&msg, "\ncopy from ");
2021 quote_c_style(name, &msg, NULL, 0);
2022 strbuf_addstr(&msg, "\ncopy to ");
2023 quote_c_style(other, &msg, NULL, 0);
2024 strbuf_addch(&msg, '\n');
2025 break;
2026 case DIFF_STATUS_RENAMED:
2027 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2028 strbuf_addstr(&msg, "\nrename from ");
2029 quote_c_style(name, &msg, NULL, 0);
2030 strbuf_addstr(&msg, "\nrename to ");
2031 quote_c_style(other, &msg, NULL, 0);
2032 strbuf_addch(&msg, '\n');
2033 break;
2034 case DIFF_STATUS_MODIFIED:
2035 if (p->score) {
2036 strbuf_addf(&msg, "dissimilarity index %d%%\n",
2037 similarity_index(p));
2038 complete_rewrite = 1;
2039 break;
2040 }
2041 /* fallthru */
2042 default:
2043 /* nothing */
2044 ;
2045 }
2047 if (hashcmp(one->sha1, two->sha1)) {
2048 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2050 if (DIFF_OPT_TST(o, BINARY)) {
2051 mmfile_t mf;
2052 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2053 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2054 abbrev = 40;
2055 }
2056 strbuf_addf(&msg, "index %.*s..%.*s",
2057 abbrev, sha1_to_hex(one->sha1),
2058 abbrev, sha1_to_hex(two->sha1));
2059 if (one->mode == two->mode)
2060 strbuf_addf(&msg, " %06o", one->mode);
2061 strbuf_addch(&msg, '\n');
2062 }
2064 if (msg.len)
2065 strbuf_setlen(&msg, msg.len - 1);
2066 xfrm_msg = msg.len ? msg.buf : NULL;
2068 if (!pgm &&
2069 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2070 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2071 /* a filepair that changes between file and symlink
2072 * needs to be split into deletion and creation.
2073 */
2074 struct diff_filespec *null = alloc_filespec(two->path);
2075 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
2076 free(null);
2077 null = alloc_filespec(one->path);
2078 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
2079 free(null);
2080 }
2081 else
2082 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
2083 complete_rewrite);
2085 strbuf_release(&msg);
2086 }
2088 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2089 struct diffstat_t *diffstat)
2090 {
2091 const char *name;
2092 const char *other;
2093 int complete_rewrite = 0;
2095 if (DIFF_PAIR_UNMERGED(p)) {
2096 /* unmerged */
2097 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2098 return;
2099 }
2101 name = p->one->path;
2102 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2104 diff_fill_sha1_info(p->one);
2105 diff_fill_sha1_info(p->two);
2107 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2108 complete_rewrite = 1;
2109 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2110 }
2112 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2113 {
2114 const char *name;
2115 const char *other;
2117 if (DIFF_PAIR_UNMERGED(p)) {
2118 /* unmerged */
2119 return;
2120 }
2122 name = p->one->path;
2123 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2125 diff_fill_sha1_info(p->one);
2126 diff_fill_sha1_info(p->two);
2128 builtin_checkdiff(name, other, p->one, p->two, o);
2129 }
2131 void diff_setup(struct diff_options *options)
2132 {
2133 memset(options, 0, sizeof(*options));
2134 options->line_termination = '\n';
2135 options->break_opt = -1;
2136 options->rename_limit = -1;
2137 options->dirstat_percent = 3;
2138 options->context = 3;
2139 options->msg_sep = "";
2141 options->change = diff_change;
2142 options->add_remove = diff_addremove;
2143 if (diff_use_color_default > 0)
2144 DIFF_OPT_SET(options, COLOR_DIFF);
2145 else
2146 DIFF_OPT_CLR(options, COLOR_DIFF);
2147 options->detect_rename = diff_detect_rename_default;
2149 options->a_prefix = "a/";
2150 options->b_prefix = "b/";
2151 }
2153 int diff_setup_done(struct diff_options *options)
2154 {
2155 int count = 0;
2157 if (options->output_format & DIFF_FORMAT_NAME)
2158 count++;
2159 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2160 count++;
2161 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2162 count++;
2163 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2164 count++;
2165 if (count > 1)
2166 die("--name-only, --name-status, --check and -s are mutually exclusive");
2168 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2169 options->detect_rename = DIFF_DETECT_COPY;
2171 if (options->output_format & (DIFF_FORMAT_NAME |
2172 DIFF_FORMAT_NAME_STATUS |
2173 DIFF_FORMAT_CHECKDIFF |
2174 DIFF_FORMAT_NO_OUTPUT))
2175 options->output_format &= ~(DIFF_FORMAT_RAW |
2176 DIFF_FORMAT_NUMSTAT |
2177 DIFF_FORMAT_DIFFSTAT |
2178 DIFF_FORMAT_SHORTSTAT |
2179 DIFF_FORMAT_DIRSTAT |
2180 DIFF_FORMAT_SUMMARY |
2181 DIFF_FORMAT_PATCH);
2183 /*
2184 * These cases always need recursive; we do not drop caller-supplied
2185 * recursive bits for other formats here.
2186 */
2187 if (options->output_format & (DIFF_FORMAT_PATCH |
2188 DIFF_FORMAT_NUMSTAT |
2189 DIFF_FORMAT_DIFFSTAT |
2190 DIFF_FORMAT_SHORTSTAT |
2191 DIFF_FORMAT_DIRSTAT |
2192 DIFF_FORMAT_SUMMARY |
2193 DIFF_FORMAT_CHECKDIFF))
2194 DIFF_OPT_SET(options, RECURSIVE);
2195 /*
2196 * Also pickaxe would not work very well if you do not say recursive
2197 */
2198 if (options->pickaxe)
2199 DIFF_OPT_SET(options, RECURSIVE);
2201 if (options->detect_rename && options->rename_limit < 0)
2202 options->rename_limit = diff_rename_limit_default;
2203 if (options->setup & DIFF_SETUP_USE_CACHE) {
2204 if (!active_cache)
2205 /* read-cache does not die even when it fails
2206 * so it is safe for us to do this here. Also
2207 * it does not smudge active_cache or active_nr
2208 * when it fails, so we do not have to worry about
2209 * cleaning it up ourselves either.
2210 */
2211 read_cache();
2212 }
2213 if (options->abbrev <= 0 || 40 < options->abbrev)
2214 options->abbrev = 40; /* full */
2216 /*
2217 * It does not make sense to show the first hit we happened
2218 * to have found. It does not make sense not to return with
2219 * exit code in such a case either.
2220 */
2221 if (DIFF_OPT_TST(options, QUIET)) {
2222 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2223 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2224 }
2226 /*
2227 * If we postprocess in diffcore, we cannot simply return
2228 * upon the first hit. We need to run diff as usual.
2229 */
2230 if (options->pickaxe || options->filter)
2231 DIFF_OPT_CLR(options, QUIET);
2233 return 0;
2234 }
2236 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2237 {
2238 char c, *eq;
2239 int len;
2241 if (*arg != '-')
2242 return 0;
2243 c = *++arg;
2244 if (!c)
2245 return 0;
2246 if (c == arg_short) {
2247 c = *++arg;
2248 if (!c)
2249 return 1;
2250 if (val && isdigit(c)) {
2251 char *end;
2252 int n = strtoul(arg, &end, 10);
2253 if (*end)
2254 return 0;
2255 *val = n;
2256 return 1;
2257 }
2258 return 0;
2259 }
2260 if (c != '-')
2261 return 0;
2262 arg++;
2263 eq = strchr(arg, '=');
2264 if (eq)
2265 len = eq - arg;
2266 else
2267 len = strlen(arg);
2268 if (!len || strncmp(arg, arg_long, len))
2269 return 0;
2270 if (eq) {
2271 int n;
2272 char *end;
2273 if (!isdigit(*++eq))
2274 return 0;
2275 n = strtoul(eq, &end, 10);
2276 if (*end)
2277 return 0;
2278 *val = n;
2279 }
2280 return 1;
2281 }
2283 static int diff_scoreopt_parse(const char *opt);
2285 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2286 {
2287 const char *arg = av[0];
2289 /* Output format options */
2290 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2291 options->output_format |= DIFF_FORMAT_PATCH;
2292 else if (opt_arg(arg, 'U', "unified", &options->context))
2293 options->output_format |= DIFF_FORMAT_PATCH;
2294 else if (!strcmp(arg, "--raw"))
2295 options->output_format |= DIFF_FORMAT_RAW;
2296 else if (!strcmp(arg, "--patch-with-raw"))
2297 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2298 else if (!strcmp(arg, "--numstat"))
2299 options->output_format |= DIFF_FORMAT_NUMSTAT;
2300 else if (!strcmp(arg, "--shortstat"))
2301 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2302 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2303 options->output_format |= DIFF_FORMAT_DIRSTAT;
2304 else if (!strcmp(arg, "--cumulative"))
2305 options->output_format |= DIFF_FORMAT_CUMULATIVE;
2306 else if (!strcmp(arg, "--check"))
2307 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2308 else if (!strcmp(arg, "--summary"))
2309 options->output_format |= DIFF_FORMAT_SUMMARY;
2310 else if (!strcmp(arg, "--patch-with-stat"))
2311 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2312 else if (!strcmp(arg, "--name-only"))
2313 options->output_format |= DIFF_FORMAT_NAME;
2314 else if (!strcmp(arg, "--name-status"))
2315 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2316 else if (!strcmp(arg, "-s"))
2317 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2318 else if (!prefixcmp(arg, "--stat")) {
2319 char *end;
2320 int width = options->stat_width;
2321 int name_width = options->stat_name_width;
2322 arg += 6;
2323 end = (char *)arg;
2325 switch (*arg) {
2326 case '-':
2327 if (!prefixcmp(arg, "-width="))
2328 width = strtoul(arg + 7, &end, 10);
2329 else if (!prefixcmp(arg, "-name-width="))
2330 name_width = strtoul(arg + 12, &end, 10);
2331 break;
2332 case '=':
2333 width = strtoul(arg+1, &end, 10);
2334 if (*end == ',')
2335 name_width = strtoul(end+1, &end, 10);
2336 }
2338 /* Important! This checks all the error cases! */
2339 if (*end)
2340 return 0;
2341 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2342 options->stat_name_width = name_width;
2343 options->stat_width = width;
2344 }
2346 /* renames options */
2347 else if (!prefixcmp(arg, "-B")) {
2348 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2349 return -1;
2350 }
2351 else if (!prefixcmp(arg, "-M")) {
2352 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2353 return -1;
2354 options->detect_rename = DIFF_DETECT_RENAME;
2355 }
2356 else if (!prefixcmp(arg, "-C")) {
2357 if (options->detect_rename == DIFF_DETECT_COPY)
2358 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2359 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2360 return -1;
2361 options->detect_rename = DIFF_DETECT_COPY;
2362 }
2363 else if (!strcmp(arg, "--no-renames"))
2364 options->detect_rename = 0;
2366 /* xdiff options */
2367 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2368 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2369 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2370 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2371 else if (!strcmp(arg, "--ignore-space-at-eol"))
2372 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2374 /* flags options */
2375 else if (!strcmp(arg, "--binary")) {
2376 options->output_format |= DIFF_FORMAT_PATCH;
2377 DIFF_OPT_SET(options, BINARY);
2378 }
2379 else if (!strcmp(arg, "--full-index"))
2380 DIFF_OPT_SET(options, FULL_INDEX);
2381 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2382 DIFF_OPT_SET(options, TEXT);
2383 else if (!strcmp(arg, "-R"))
2384 DIFF_OPT_SET(options, REVERSE_DIFF);
2385 else if (!strcmp(arg, "--find-copies-harder"))
2386 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2387 else if (!strcmp(arg, "--follow"))
2388 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2389 else if (!strcmp(arg, "--color"))
2390 DIFF_OPT_SET(options, COLOR_DIFF);
2391 else if (!strcmp(arg, "--no-color"))
2392 DIFF_OPT_CLR(options, COLOR_DIFF);
2393 else if (!strcmp(arg, "--color-words"))
2394 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2395 else if (!strcmp(arg, "--exit-code"))
2396 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2397 else if (!strcmp(arg, "--quiet"))
2398 DIFF_OPT_SET(options, QUIET);
2399 else if (!strcmp(arg, "--ext-diff"))
2400 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2401 else if (!strcmp(arg, "--no-ext-diff"))
2402 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2404 /* misc options */
2405 else if (!strcmp(arg, "-z"))
2406 options->line_termination = 0;
2407 else if (!prefixcmp(arg, "-l"))
2408 options->rename_limit = strtoul(arg+2, NULL, 10);
2409 else if (!prefixcmp(arg, "-S"))
2410 options->pickaxe = arg + 2;
2411 else if (!strcmp(arg, "--pickaxe-all"))
2412 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2413 else if (!strcmp(arg, "--pickaxe-regex"))
2414 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2415 else if (!prefixcmp(arg, "-O"))
2416 options->orderfile = arg + 2;
2417 else if (!prefixcmp(arg, "--diff-filter="))
2418 options->filter = arg + 14;
2419 else if (!strcmp(arg, "--abbrev"))
2420 options->abbrev = DEFAULT_ABBREV;
2421 else if (!prefixcmp(arg, "--abbrev=")) {
2422 options->abbrev = strtoul(arg + 9, NULL, 10);
2423 if (options->abbrev < MINIMUM_ABBREV)
2424 options->abbrev = MINIMUM_ABBREV;
2425 else if (40 < options->abbrev)
2426 options->abbrev = 40;
2427 }
2428 else if (!prefixcmp(arg, "--src-prefix="))
2429 options->a_prefix = arg + 13;
2430 else if (!prefixcmp(arg, "--dst-prefix="))
2431 options->b_prefix = arg + 13;
2432 else if (!strcmp(arg, "--no-prefix"))
2433 options->a_prefix = options->b_prefix = "";
2434 else
2435 return 0;
2436 return 1;
2437 }
2439 static int parse_num(const char **cp_p)
2440 {
2441 unsigned long num, scale;
2442 int ch, dot;
2443 const char *cp = *cp_p;
2445 num = 0;
2446 scale = 1;
2447 dot = 0;
2448 for(;;) {
2449 ch = *cp;
2450 if ( !dot && ch == '.' ) {
2451 scale = 1;
2452 dot = 1;
2453 } else if ( ch == '%' ) {
2454 scale = dot ? scale*100 : 100;
2455 cp++; /* % is always at the end */
2456 break;
2457 } else if ( ch >= '0' && ch <= '9' ) {
2458 if ( scale < 100000 ) {
2459 scale *= 10;
2460 num = (num*10) + (ch-'0');
2461 }
2462 } else {
2463 break;
2464 }
2465 cp++;
2466 }
2467 *cp_p = cp;
2469 /* user says num divided by scale and we say internally that
2470 * is MAX_SCORE * num / scale.
2471 */
2472 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2473 }
2475 static int diff_scoreopt_parse(const char *opt)
2476 {
2477 int opt1, opt2, cmd;
2479 if (*opt++ != '-')
2480 return -1;
2481 cmd = *opt++;
2482 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2483 return -1; /* that is not a -M, -C nor -B option */
2485 opt1 = parse_num(&opt);
2486 if (cmd != 'B')
2487 opt2 = 0;
2488 else {
2489 if (*opt == 0)
2490 opt2 = 0;
2491 else if (*opt != '/')
2492 return -1; /* we expect -B80/99 or -B80 */
2493 else {
2494 opt++;
2495 opt2 = parse_num(&opt);
2496 }
2497 }
2498 if (*opt != 0)
2499 return -1;
2500 return opt1 | (opt2 << 16);
2501 }
2503 struct diff_queue_struct diff_queued_diff;
2505 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2506 {
2507 if (queue->alloc <= queue->nr) {
2508 queue->alloc = alloc_nr(queue->alloc);
2509 queue->queue = xrealloc(queue->queue,
2510 sizeof(dp) * queue->alloc);
2511 }
2512 queue->queue[queue->nr++] = dp;
2513 }
2515 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2516 struct diff_filespec *one,
2517 struct diff_filespec *two)
2518 {
2519 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2520 dp->one = one;
2521 dp->two = two;
2522 if (queue)
2523 diff_q(queue, dp);
2524 return dp;
2525 }
2527 void diff_free_filepair(struct diff_filepair *p)
2528 {
2529 free_filespec(p->one);
2530 free_filespec(p->two);
2531 free(p);
2532 }
2534 /* This is different from find_unique_abbrev() in that
2535 * it stuffs the result with dots for alignment.
2536 */
2537 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2538 {
2539 int abblen;
2540 const char *abbrev;
2541 if (len == 40)
2542 return sha1_to_hex(sha1);
2544 abbrev = find_unique_abbrev(sha1, len);
2545 if (!abbrev)
2546 return sha1_to_hex(sha1);
2547 abblen = strlen(abbrev);
2548 if (abblen < 37) {
2549 static char hex[41];
2550 if (len < abblen && abblen <= len + 2)
2551 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2552 else
2553 sprintf(hex, "%s...", abbrev);
2554 return hex;
2555 }
2556 return sha1_to_hex(sha1);
2557 }
2559 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2560 {
2561 int line_termination = opt->line_termination;
2562 int inter_name_termination = line_termination ? '\t' : '\0';
2564 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2565 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2566 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2567 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2568 }
2569 if (p->score) {
2570 printf("%c%03d%c", p->status, similarity_index(p),
2571 inter_name_termination);
2572 } else {
2573 printf("%c%c", p->status, inter_name_termination);
2574 }
2576 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2577 write_name_quoted(p->one->path, stdout, inter_name_termination);
2578 write_name_quoted(p->two->path, stdout, line_termination);
2579 } else {
2580 const char *path = p->one->mode ? p->one->path : p->two->path;
2581 write_name_quoted(path, stdout, line_termination);
2582 }
2583 }
2585 int diff_unmodified_pair(struct diff_filepair *p)
2586 {
2587 /* This function is written stricter than necessary to support
2588 * the currently implemented transformers, but the idea is to
2589 * let transformers to produce diff_filepairs any way they want,
2590 * and filter and clean them up here before producing the output.
2591 */
2592 struct diff_filespec *one = p->one, *two = p->two;
2594 if (DIFF_PAIR_UNMERGED(p))
2595 return 0; /* unmerged is interesting */
2597 /* deletion, addition, mode or type change
2598 * and rename are all interesting.
2599 */
2600 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2601 DIFF_PAIR_MODE_CHANGED(p) ||
2602 strcmp(one->path, two->path))
2603 return 0;
2605 /* both are valid and point at the same path. that is, we are
2606 * dealing with a change.
2607 */
2608 if (one->sha1_valid && two->sha1_valid &&
2609 !hashcmp(one->sha1, two->sha1))
2610 return 1; /* no change */
2611 if (!one->sha1_valid && !two->sha1_valid)
2612 return 1; /* both look at the same file on the filesystem. */
2613 return 0;
2614 }
2616 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2617 {
2618 if (diff_unmodified_pair(p))
2619 return;
2621 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2622 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2623 return; /* no tree diffs in patch format */
2625 run_diff(p, o);
2626 }
2628 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2629 struct diffstat_t *diffstat)
2630 {
2631 if (diff_unmodified_pair(p))
2632 return;
2634 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2635 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2636 return; /* no tree diffs in patch format */
2638 run_diffstat(p, o, diffstat);
2639 }
2641 static void diff_flush_checkdiff(struct diff_filepair *p,
2642 struct diff_options *o)
2643 {
2644 if (diff_unmodified_pair(p))
2645 return;
2647 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2648 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2649 return; /* no tree diffs in patch format */
2651 run_checkdiff(p, o);
2652 }
2654 int diff_queue_is_empty(void)
2655 {
2656 struct diff_queue_struct *q = &diff_queued_diff;
2657 int i;
2658 for (i = 0; i < q->nr; i++)
2659 if (!diff_unmodified_pair(q->queue[i]))
2660 return 0;
2661 return 1;
2662 }
2664 #if DIFF_DEBUG
2665 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2666 {
2667 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2668 x, one ? one : "",
2669 s->path,
2670 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2671 s->mode,
2672 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2673 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2674 x, one ? one : "",
2675 s->size, s->xfrm_flags);
2676 }
2678 void diff_debug_filepair(const struct diff_filepair *p, int i)
2679 {
2680 diff_debug_filespec(p->one, i, "one");
2681 diff_debug_filespec(p->two, i, "two");
2682 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2683 p->score, p->status ? p->status : '?',
2684 p->one->rename_used, p->broken_pair);
2685 }
2687 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2688 {
2689 int i;
2690 if (msg)
2691 fprintf(stderr, "%s\n", msg);
2692 fprintf(stderr, "q->nr = %d\n", q->nr);
2693 for (i = 0; i < q->nr; i++) {
2694 struct diff_filepair *p = q->queue[i];
2695 diff_debug_filepair(p, i);
2696 }
2697 }
2698 #endif
2700 static void diff_resolve_rename_copy(void)
2701 {
2702 int i;
2703 struct diff_filepair *p;
2704 struct diff_queue_struct *q = &diff_queued_diff;
2706 diff_debug_queue("resolve-rename-copy", q);
2708 for (i = 0; i < q->nr; i++) {
2709 p = q->queue[i];
2710 p->status = 0; /* undecided */
2711 if (DIFF_PAIR_UNMERGED(p))
2712 p->status = DIFF_STATUS_UNMERGED;
2713 else if (!DIFF_FILE_VALID(p->one))
2714 p->status = DIFF_STATUS_ADDED;
2715 else if (!DIFF_FILE_VALID(p->two))
2716 p->status = DIFF_STATUS_DELETED;
2717 else if (DIFF_PAIR_TYPE_CHANGED(p))
2718 p->status = DIFF_STATUS_TYPE_CHANGED;
2720 /* from this point on, we are dealing with a pair
2721 * whose both sides are valid and of the same type, i.e.
2722 * either in-place edit or rename/copy edit.
2723 */
2724 else if (DIFF_PAIR_RENAME(p)) {
2725 /*
2726 * A rename might have re-connected a broken
2727 * pair up, causing the pathnames to be the
2728 * same again. If so, that's not a rename at
2729 * all, just a modification..
2730 *
2731 * Otherwise, see if this source was used for
2732 * multiple renames, in which case we decrement
2733 * the count, and call it a copy.
2734 */
2735 if (!strcmp(p->one->path, p->two->path))
2736 p->status = DIFF_STATUS_MODIFIED;
2737 else if (--p->one->rename_used > 0)
2738 p->status = DIFF_STATUS_COPIED;
2739 else
2740 p->status = DIFF_STATUS_RENAMED;
2741 }
2742 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2743 p->one->mode != p->two->mode ||
2744 is_null_sha1(p->one->sha1))
2745 p->status = DIFF_STATUS_MODIFIED;
2746 else {
2747 /* This is a "no-change" entry and should not
2748 * happen anymore, but prepare for broken callers.
2749 */
2750 error("feeding unmodified %s to diffcore",
2751 p->one->path);
2752 p->status = DIFF_STATUS_UNKNOWN;
2753 }
2754 }
2755 diff_debug_queue("resolve-rename-copy done", q);
2756 }
2758 static int check_pair_status(struct diff_filepair *p)
2759 {
2760 switch (p->status) {
2761 case DIFF_STATUS_UNKNOWN:
2762 return 0;
2763 case 0:
2764 die("internal error in diff-resolve-rename-copy");
2765 default:
2766 return 1;
2767 }
2768 }
2770 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2771 {
2772 int fmt = opt->output_format;
2774 if (fmt & DIFF_FORMAT_CHECKDIFF)
2775 diff_flush_checkdiff(p, opt);
2776 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2777 diff_flush_raw(p, opt);
2778 else if (fmt & DIFF_FORMAT_NAME)
2779 write_name_quoted(p->two->path, stdout, opt->line_termination);
2780 }
2782 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2783 {
2784 if (fs->mode)
2785 printf(" %s mode %06o ", newdelete, fs->mode);
2786 else
2787 printf(" %s ", newdelete);
2788 write_name_quoted(fs->path, stdout, '\n');
2789 }
2792 static void show_mode_change(struct diff_filepair *p, int show_name)
2793 {
2794 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2795 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2796 show_name ? ' ' : '\n');
2797 if (show_name) {
2798 write_name_quoted(p->two->path, stdout, '\n');
2799 }
2800 }
2801 }
2803 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2804 {
2805 char *names = pprint_rename(p->one->path, p->two->path);
2807 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2808 free(names);
2809 show_mode_change(p, 0);
2810 }
2812 static void diff_summary(struct diff_filepair *p)
2813 {
2814 switch(p->status) {
2815 case DIFF_STATUS_DELETED:
2816 show_file_mode_name("delete", p->one);
2817 break;
2818 case DIFF_STATUS_ADDED:
2819 show_file_mode_name("create", p->two);
2820 break;
2821 case DIFF_STATUS_COPIED:
2822 show_rename_copy("copy", p);
2823 break;
2824 case DIFF_STATUS_RENAMED:
2825 show_rename_copy("rename", p);
2826 break;
2827 default:
2828 if (p->score) {
2829 fputs(" rewrite ", stdout);
2830 write_name_quoted(p->two->path, stdout, ' ');
2831 printf("(%d%%)\n", similarity_index(p));
2832 }
2833 show_mode_change(p, !p->score);
2834 break;
2835 }
2836 }
2838 struct patch_id_t {
2839 struct xdiff_emit_state xm;
2840 SHA_CTX *ctx;
2841 int patchlen;
2842 };
2844 static int remove_space(char *line, int len)
2845 {
2846 int i;
2847 char *dst = line;
2848 unsigned char c;
2850 for (i = 0; i < len; i++)
2851 if (!isspace((c = line[i])))
2852 *dst++ = c;
2854 return dst - line;
2855 }
2857 static void patch_id_consume(void *priv, char *line, unsigned long len)
2858 {
2859 struct patch_id_t *data = priv;
2860 int new_len;
2862 /* Ignore line numbers when computing the SHA1 of the patch */
2863 if (!prefixcmp(line, "@@ -"))
2864 return;
2866 new_len = remove_space(line, len);
2868 SHA1_Update(data->ctx, line, new_len);
2869 data->patchlen += new_len;
2870 }
2872 /* returns 0 upon success, and writes result into sha1 */
2873 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2874 {
2875 struct diff_queue_struct *q = &diff_queued_diff;
2876 int i;
2877 SHA_CTX ctx;
2878 struct patch_id_t data;
2879 char buffer[PATH_MAX * 4 + 20];
2881 SHA1_Init(&ctx);
2882 memset(&data, 0, sizeof(struct patch_id_t));
2883 data.ctx = &ctx;
2884 data.xm.consume = patch_id_consume;
2886 for (i = 0; i < q->nr; i++) {
2887 xpparam_t xpp;
2888 xdemitconf_t xecfg;
2889 xdemitcb_t ecb;
2890 mmfile_t mf1, mf2;
2891 struct diff_filepair *p = q->queue[i];
2892 int len1, len2;
2894 memset(&xecfg, 0, sizeof(xecfg));
2895 if (p->status == 0)
2896 return error("internal diff status error");
2897 if (p->status == DIFF_STATUS_UNKNOWN)
2898 continue;
2899 if (diff_unmodified_pair(p))
2900 continue;
2901 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2902 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2903 continue;
2904 if (DIFF_PAIR_UNMERGED(p))
2905 continue;
2907 diff_fill_sha1_info(p->one);
2908 diff_fill_sha1_info(p->two);
2909 if (fill_mmfile(&mf1, p->one) < 0 ||
2910 fill_mmfile(&mf2, p->two) < 0)
2911 return error("unable to read files to diff");
2913 len1 = remove_space(p->one->path, strlen(p->one->path));
2914 len2 = remove_space(p->two->path, strlen(p->two->path));
2915 if (p->one->mode == 0)
2916 len1 = snprintf(buffer, sizeof(buffer),
2917 "diff--gita/%.*sb/%.*s"
2918 "newfilemode%06o"
2919 "---/dev/null"
2920 "+++b/%.*s",
2921 len1, p->one->path,
2922 len2, p->two->path,
2923 p->two->mode,
2924 len2, p->two->path);
2925 else if (p->two->mode == 0)
2926 len1 = snprintf(buffer, sizeof(buffer),
2927 "diff--gita/%.*sb/%.*s"
2928 "deletedfilemode%06o"
2929 "---a/%.*s"
2930 "+++/dev/null",
2931 len1, p->one->path,
2932 len2, p->two->path,
2933 p->one->mode,
2934 len1, p->one->path);
2935 else
2936 len1 = snprintf(buffer, sizeof(buffer),
2937 "diff--gita/%.*sb/%.*s"
2938 "---a/%.*s"
2939 "+++b/%.*s",
2940 len1, p->one->path,
2941 len2, p->two->path,
2942 len1, p->one->path,
2943 len2, p->two->path);
2944 SHA1_Update(&ctx, buffer, len1);
2946 xpp.flags = XDF_NEED_MINIMAL;
2947 xecfg.ctxlen = 3;
2948 xecfg.flags = XDL_EMIT_FUNCNAMES;
2949 ecb.outf = xdiff_outf;
2950 ecb.priv = &data;
2951 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2952 }
2954 SHA1_Final(sha1, &ctx);
2955 return 0;
2956 }
2958 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2959 {
2960 struct diff_queue_struct *q = &diff_queued_diff;
2961 int i;
2962 int result = diff_get_patch_id(options, sha1);
2964 for (i = 0; i < q->nr; i++)
2965 diff_free_filepair(q->queue[i]);
2967 free(q->queue);
2968 q->queue = NULL;
2969 q->nr = q->alloc = 0;
2971 return result;
2972 }
2974 static int is_summary_empty(const struct diff_queue_struct *q)
2975 {
2976 int i;
2978 for (i = 0; i < q->nr; i++) {
2979 const struct diff_filepair *p = q->queue[i];
2981 switch (p->status) {
2982 case DIFF_STATUS_DELETED:
2983 case DIFF_STATUS_ADDED:
2984 case DIFF_STATUS_COPIED:
2985 case DIFF_STATUS_RENAMED:
2986 return 0;
2987 default:
2988 if (p->score)
2989 return 0;
2990 if (p->one->mode && p->two->mode &&
2991 p->one->mode != p->two->mode)
2992 return 0;
2993 break;
2994 }
2995 }
2996 return 1;
2997 }
2999 void diff_flush(struct diff_options *options)
3000 {
3001 struct diff_queue_struct *q = &diff_queued_diff;
3002 int i, output_format = options->output_format;
3003 int separator = 0;
3005 /*
3006 * Order: raw, stat, summary, patch
3007 * or: name/name-status/checkdiff (other bits clear)
3008 */
3009 if (!q->nr)
3010 goto free_queue;
3012 if (output_format & (DIFF_FORMAT_RAW |
3013 DIFF_FORMAT_NAME |
3014 DIFF_FORMAT_NAME_STATUS |
3015 DIFF_FORMAT_CHECKDIFF)) {
3016 for (i = 0; i < q->nr; i++) {
3017 struct diff_filepair *p = q->queue[i];
3018 if (check_pair_status(p))
3019 flush_one_pair(p, options);
3020 }
3021 separator++;
3022 }
3024 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIRSTAT)) {
3025 struct diffstat_t diffstat;
3027 memset(&diffstat, 0, sizeof(struct diffstat_t));
3028 diffstat.xm.consume = diffstat_consume;
3029 for (i = 0; i < q->nr; i++) {
3030 struct diff_filepair *p = q->queue[i];
3031 if (check_pair_status(p))
3032 diff_flush_stat(p, options, &diffstat);
3033 }
3034 if (output_format & DIFF_FORMAT_DIRSTAT)
3035 show_dirstat(&diffstat, options);
3036 if (output_format & DIFF_FORMAT_NUMSTAT)
3037 show_numstat(&diffstat, options);
3038 if (output_format & DIFF_FORMAT_DIFFSTAT)
3039 show_stats(&diffstat, options);
3040 if (output_format & DIFF_FORMAT_SHORTSTAT)
3041 show_shortstats(&diffstat);
3042 free_diffstat_info(&diffstat);
3043 separator++;
3044 }
3046 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3047 for (i = 0; i < q->nr; i++)
3048 diff_summary(q->queue[i]);
3049 separator++;
3050 }
3052 if (output_format & DIFF_FORMAT_PATCH) {
3053 if (separator) {
3054 if (options->stat_sep) {
3055 /* attach patch instead of inline */
3056 fputs(options->stat_sep, stdout);
3057 } else {
3058 putchar(options->line_termination);
3059 }
3060 }
3062 for (i = 0; i < q->nr; i++) {
3063 struct diff_filepair *p = q->queue[i];
3064 if (check_pair_status(p))
3065 diff_flush_patch(p, options);
3066 }
3067 }
3069 if (output_format & DIFF_FORMAT_CALLBACK)
3070 options->format_callback(q, options, options->format_callback_data);
3072 for (i = 0; i < q->nr; i++)
3073 diff_free_filepair(q->queue[i]);
3074 free_queue:
3075 free(q->queue);
3076 q->queue = NULL;
3077 q->nr = q->alloc = 0;
3078 }
3080 static void diffcore_apply_filter(const char *filter)
3081 {
3082 int i;
3083 struct diff_queue_struct *q = &diff_queued_diff;
3084 struct diff_queue_struct outq;
3085 outq.queue = NULL;
3086 outq.nr = outq.alloc = 0;
3088 if (!filter)
3089 return;
3091 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3092 int found;
3093 for (i = found = 0; !found && i < q->nr; i++) {
3094 struct diff_filepair *p = q->queue[i];
3095 if (((p->status == DIFF_STATUS_MODIFIED) &&
3096 ((p->score &&
3097 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3098 (!p->score &&
3099 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3100 ((p->status != DIFF_STATUS_MODIFIED) &&
3101 strchr(filter, p->status)))
3102 found++;
3103 }
3104 if (found)
3105 return;
3107 /* otherwise we will clear the whole queue
3108 * by copying the empty outq at the end of this
3109 * function, but first clear the current entries
3110 * in the queue.
3111 */
3112 for (i = 0; i < q->nr; i++)
3113 diff_free_filepair(q->queue[i]);
3114 }
3115 else {
3116 /* Only the matching ones */
3117 for (i = 0; i < q->nr; i++) {
3118 struct diff_filepair *p = q->queue[i];
3120 if (((p->status == DIFF_STATUS_MODIFIED) &&
3121 ((p->score &&
3122 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3123 (!p->score &&
3124 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3125 ((p->status != DIFF_STATUS_MODIFIED) &&
3126 strchr(filter, p->status)))
3127 diff_q(&outq, p);
3128 else
3129 diff_free_filepair(p);
3130 }
3131 }
3132 free(q->queue);
3133 *q = outq;
3134 }
3136 /* Check whether two filespecs with the same mode and size are identical */
3137 static int diff_filespec_is_identical(struct diff_filespec *one,
3138 struct diff_filespec *two)
3139 {
3140 if (S_ISGITLINK(one->mode)) {
3141 diff_fill_sha1_info(one);
3142 diff_fill_sha1_info(two);
3143 return !hashcmp(one->sha1, two->sha1);
3144 }
3145 if (diff_populate_filespec(one, 0))
3146 return 0;
3147 if (diff_populate_filespec(two, 0))
3148 return 0;
3149 return !memcmp(one->data, two->data, one->size);
3150 }
3152 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3153 {
3154 int i;
3155 struct diff_queue_struct *q = &diff_queued_diff;
3156 struct diff_queue_struct outq;
3157 outq.queue = NULL;
3158 outq.nr = outq.alloc = 0;
3160 for (i = 0; i < q->nr; i++) {
3161 struct diff_filepair *p = q->queue[i];
3163 /*
3164 * 1. Entries that come from stat info dirtyness
3165 * always have both sides (iow, not create/delete),
3166 * one side of the object name is unknown, with
3167 * the same mode and size. Keep the ones that
3168 * do not match these criteria. They have real
3169 * differences.
3170 *
3171 * 2. At this point, the file is known to be modified,
3172 * with the same mode and size, and the object
3173 * name of one side is unknown. Need to inspect
3174 * the identical contents.
3175 */
3176 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3177 !DIFF_FILE_VALID(p->two) ||
3178 (p->one->sha1_valid && p->two->sha1_valid) ||
3179 (p->one->mode != p->two->mode) ||
3180 diff_populate_filespec(p->one, 1) ||
3181 diff_populate_filespec(p->two, 1) ||
3182 (p->one->size != p->two->size) ||
3183 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3184 diff_q(&outq, p);
3185 else {
3186 /*
3187 * The caller can subtract 1 from skip_stat_unmatch
3188 * to determine how many paths were dirty only
3189 * due to stat info mismatch.
3190 */
3191 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3192 diffopt->skip_stat_unmatch++;
3193 diff_free_filepair(p);
3194 }
3195 }
3196 free(q->queue);
3197 *q = outq;
3198 }
3200 void diffcore_std(struct diff_options *options)
3201 {
3202 if (DIFF_OPT_TST(options, QUIET))
3203 return;
3205 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3206 diffcore_skip_stat_unmatch(options);
3207 if (options->break_opt != -1)
3208 diffcore_break(options->break_opt);
3209 if (options->detect_rename)
3210 diffcore_rename(options);
3211 if (options->break_opt != -1)
3212 diffcore_merge_broken();
3213 if (options->pickaxe)
3214 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3215 if (options->orderfile)
3216 diffcore_order(options->orderfile);
3217 diff_resolve_rename_copy();
3218 diffcore_apply_filter(options->filter);
3220 if (diff_queued_diff.nr)
3221 DIFF_OPT_SET(options, HAS_CHANGES);
3222 else
3223 DIFF_OPT_CLR(options, HAS_CHANGES);
3224 }
3226 int diff_result_code(struct diff_options *opt, int status)
3227 {
3228 int result = 0;
3229 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3230 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3231 return status;
3232 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3233 DIFF_OPT_TST(opt, HAS_CHANGES))
3234 result |= 01;
3235 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3236 DIFF_OPT_TST(opt, CHECK_FAILED))
3237 result |= 02;
3238 return result;
3239 }
3241 void diff_addremove(struct diff_options *options,
3242 int addremove, unsigned mode,
3243 const unsigned char *sha1,
3244 const char *base, const char *path)
3245 {
3246 char concatpath[PATH_MAX];
3247 struct diff_filespec *one, *two;
3249 /* This may look odd, but it is a preparation for
3250 * feeding "there are unchanged files which should
3251 * not produce diffs, but when you are doing copy
3252 * detection you would need them, so here they are"
3253 * entries to the diff-core. They will be prefixed
3254 * with something like '=' or '*' (I haven't decided
3255 * which but should not make any difference).
3256 * Feeding the same new and old to diff_change()
3257 * also has the same effect.
3258 * Before the final output happens, they are pruned after
3259 * merged into rename/copy pairs as appropriate.
3260 */
3261 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3262 addremove = (addremove == '+' ? '-' :
3263 addremove == '-' ? '+' : addremove);
3265 if (!path) path = "";
3266 sprintf(concatpath, "%s%s", base, path);
3267 one = alloc_filespec(concatpath);
3268 two = alloc_filespec(concatpath);
3270 if (addremove != '+')
3271 fill_filespec(one, sha1, mode);
3272 if (addremove != '-')
3273 fill_filespec(two, sha1, mode);
3275 diff_queue(&diff_queued_diff, one, two);
3276 DIFF_OPT_SET(options, HAS_CHANGES);
3277 }
3279 void diff_change(struct diff_options *options,
3280 unsigned old_mode, unsigned new_mode,
3281 const unsigned char *old_sha1,
3282 const unsigned char *new_sha1,
3283 const char *base, const char *path)
3284 {
3285 char concatpath[PATH_MAX];
3286 struct diff_filespec *one, *two;
3288 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3289 unsigned tmp;
3290 const unsigned char *tmp_c;
3291 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3292 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3293 }
3294 if (!path) path = "";
3295 sprintf(concatpath, "%s%s", base, path);
3296 one = alloc_filespec(concatpath);
3297 two = alloc_filespec(concatpath);
3298 fill_filespec(one, old_sha1, old_mode);
3299 fill_filespec(two, new_sha1, new_mode);
3301 diff_queue(&diff_queued_diff, one, two);
3302 DIFF_OPT_SET(options, HAS_CHANGES);
3303 }
3305 void diff_unmerge(struct diff_options *options,
3306 const char *path,
3307 unsigned mode, const unsigned char *sha1)
3308 {
3309 struct diff_filespec *one, *two;
3310 one = alloc_filespec(path);
3311 two = alloc_filespec(path);
3312 fill_filespec(one, sha1, mode);
3313 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3314 }