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git-rebase -i: clean-up error check codepath.
[git/jrn.git] / diff.c
blob5bdc111378d61e5bdb13d1908217ab44bfc7967d
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13
14 #ifdef NO_FAST_WORKING_DIRECTORY
15 #define FAST_WORKING_DIRECTORY 0
16 #else
17 #define FAST_WORKING_DIRECTORY 1
18 #endif
19
20 static int diff_detect_rename_default;
21 static int diff_rename_limit_default = 100;
22 static int diff_use_color_default;
23 static const char *external_diff_cmd_cfg;
24 int diff_auto_refresh_index = 1;
25
26 static char diff_colors[][COLOR_MAXLEN] = {
27 "\033[m", /* reset */
28 "", /* PLAIN (normal) */
29 "\033[1m", /* METAINFO (bold) */
30 "\033[36m", /* FRAGINFO (cyan) */
31 "\033[31m", /* OLD (red) */
32 "\033[32m", /* NEW (green) */
33 "\033[33m", /* COMMIT (yellow) */
34 "\033[41m", /* WHITESPACE (red background) */
35 };
36
37 static int parse_diff_color_slot(const char *var, int ofs)
38 {
39 if (!strcasecmp(var+ofs, "plain"))
40 return DIFF_PLAIN;
41 if (!strcasecmp(var+ofs, "meta"))
42 return DIFF_METAINFO;
43 if (!strcasecmp(var+ofs, "frag"))
44 return DIFF_FRAGINFO;
45 if (!strcasecmp(var+ofs, "old"))
46 return DIFF_FILE_OLD;
47 if (!strcasecmp(var+ofs, "new"))
48 return DIFF_FILE_NEW;
49 if (!strcasecmp(var+ofs, "commit"))
50 return DIFF_COMMIT;
51 if (!strcasecmp(var+ofs, "whitespace"))
52 return DIFF_WHITESPACE;
53 die("bad config variable '%s'", var);
54 }
55
56 static struct ll_diff_driver {
57 const char *name;
58 struct ll_diff_driver *next;
59 char *cmd;
60 } *user_diff, **user_diff_tail;
61
62 static void read_config_if_needed(void)
63 {
64 if (!user_diff_tail) {
65 user_diff_tail = &user_diff;
66 git_config(git_diff_ui_config);
67 }
68 }
69
70 /*
71 * Currently there is only "diff.<drivername>.command" variable;
72 * because there are "diff.color.<slot>" variables, we are parsing
73 * this in a bit convoluted way to allow low level diff driver
74 * called "color".
75 */
76 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
77 {
78 const char *name;
79 int namelen;
80 struct ll_diff_driver *drv;
81
82 name = var + 5;
83 namelen = ep - name;
84 for (drv = user_diff; drv; drv = drv->next)
85 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
86 break;
87 if (!drv) {
88 drv = xcalloc(1, sizeof(struct ll_diff_driver));
89 drv->name = xmemdupz(name, namelen);
90 if (!user_diff_tail)
91 user_diff_tail = &user_diff;
92 *user_diff_tail = drv;
93 user_diff_tail = &(drv->next);
94 }
95
96 if (!value)
97 return error("%s: lacks value", var);
98 drv->cmd = strdup(value);
99 return 0;
100 }
101
102 /*
103 * 'diff.<what>.funcname' attribute can be specified in the configuration
104 * to define a customized regexp to find the beginning of a function to
105 * be used for hunk header lines of "diff -p" style output.
106 */
107 static struct funcname_pattern {
108 char *name;
109 char *pattern;
110 struct funcname_pattern *next;
111 } *funcname_pattern_list;
112
113 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
114 {
115 const char *name;
116 int namelen;
117 struct funcname_pattern *pp;
118
119 name = var + 5; /* "diff." */
120 namelen = ep - name;
121
122 for (pp = funcname_pattern_list; pp; pp = pp->next)
123 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
124 break;
125 if (!pp) {
126 pp = xcalloc(1, sizeof(*pp));
127 pp->name = xmemdupz(name, namelen);
128 pp->next = funcname_pattern_list;
129 funcname_pattern_list = pp;
130 }
131 if (pp->pattern)
132 free(pp->pattern);
133 pp->pattern = xstrdup(value);
134 return 0;
135 }
136
137 /*
138 * These are to give UI layer defaults.
139 * The core-level commands such as git-diff-files should
140 * never be affected by the setting of diff.renames
141 * the user happens to have in the configuration file.
142 */
143 int git_diff_ui_config(const char *var, const char *value)
144 {
145 if (!strcmp(var, "diff.renamelimit")) {
146 diff_rename_limit_default = git_config_int(var, value);
147 return 0;
148 }
149 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
150 diff_use_color_default = git_config_colorbool(var, value, -1);
151 return 0;
152 }
153 if (!strcmp(var, "diff.renames")) {
154 if (!value)
155 diff_detect_rename_default = DIFF_DETECT_RENAME;
156 else if (!strcasecmp(value, "copies") ||
157 !strcasecmp(value, "copy"))
158 diff_detect_rename_default = DIFF_DETECT_COPY;
159 else if (git_config_bool(var,value))
160 diff_detect_rename_default = DIFF_DETECT_RENAME;
161 return 0;
162 }
163 if (!strcmp(var, "diff.autorefreshindex")) {
164 diff_auto_refresh_index = git_config_bool(var, value);
165 return 0;
166 }
167 if (!strcmp(var, "diff.external")) {
168 external_diff_cmd_cfg = xstrdup(value);
169 return 0;
170 }
171 if (!prefixcmp(var, "diff.")) {
172 const char *ep = strrchr(var, '.');
173
174 if (ep != var + 4) {
175 if (!strcmp(ep, ".command"))
176 return parse_lldiff_command(var, ep, value);
177 if (!strcmp(ep, ".funcname"))
178 return parse_funcname_pattern(var, ep, value);
179 }
180 }
181 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
182 int slot = parse_diff_color_slot(var, 11);
183 color_parse(value, var, diff_colors[slot]);
184 return 0;
185 }
186
187 return git_default_config(var, value);
188 }
189
190 static char *quote_two(const char *one, const char *two)
191 {
192 int need_one = quote_c_style(one, NULL, NULL, 1);
193 int need_two = quote_c_style(two, NULL, NULL, 1);
194 struct strbuf res;
195
196 strbuf_init(&res, 0);
197 if (need_one + need_two) {
198 strbuf_addch(&res, '"');
199 quote_c_style(one, &res, NULL, 1);
200 quote_c_style(two, &res, NULL, 1);
201 strbuf_addch(&res, '"');
202 } else {
203 strbuf_addstr(&res, one);
204 strbuf_addstr(&res, two);
205 }
206 return strbuf_detach(&res, NULL);
207 }
208
209 static const char *external_diff(void)
210 {
211 static const char *external_diff_cmd = NULL;
212 static int done_preparing = 0;
213
214 if (done_preparing)
215 return external_diff_cmd;
216 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
217 if (!external_diff_cmd)
218 external_diff_cmd = external_diff_cmd_cfg;
219 done_preparing = 1;
220 return external_diff_cmd;
221 }
222
223 static struct diff_tempfile {
224 const char *name; /* filename external diff should read from */
225 char hex[41];
226 char mode[10];
227 char tmp_path[PATH_MAX];
228 } diff_temp[2];
229
230 static int count_lines(const char *data, int size)
231 {
232 int count, ch, completely_empty = 1, nl_just_seen = 0;
233 count = 0;
234 while (0 < size--) {
235 ch = *data++;
236 if (ch == '\n') {
237 count++;
238 nl_just_seen = 1;
239 completely_empty = 0;
240 }
241 else {
242 nl_just_seen = 0;
243 completely_empty = 0;
244 }
245 }
246 if (completely_empty)
247 return 0;
248 if (!nl_just_seen)
249 count++; /* no trailing newline */
250 return count;
251 }
252
253 static void print_line_count(int count)
254 {
255 switch (count) {
256 case 0:
257 printf("0,0");
258 break;
259 case 1:
260 printf("1");
261 break;
262 default:
263 printf("1,%d", count);
264 break;
265 }
266 }
267
268 static void copy_file(int prefix, const char *data, int size,
269 const char *set, const char *reset)
270 {
271 int ch, nl_just_seen = 1;
272 while (0 < size--) {
273 ch = *data++;
274 if (nl_just_seen) {
275 fputs(set, stdout);
276 putchar(prefix);
277 }
278 if (ch == '\n') {
279 nl_just_seen = 1;
280 fputs(reset, stdout);
281 } else
282 nl_just_seen = 0;
283 putchar(ch);
284 }
285 if (!nl_just_seen)
286 printf("%s\n\\ No newline at end of file\n", reset);
287 }
288
289 static void emit_rewrite_diff(const char *name_a,
290 const char *name_b,
291 struct diff_filespec *one,
292 struct diff_filespec *two,
293 struct diff_options *o)
294 {
295 int lc_a, lc_b;
296 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
297 const char *name_a_tab, *name_b_tab;
298 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
299 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
300 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
301 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
302 const char *reset = diff_get_color(color_diff, DIFF_RESET);
303 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
304
305 name_a += (*name_a == '/');
306 name_b += (*name_b == '/');
307 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
308 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
309
310 strbuf_reset(&a_name);
311 strbuf_reset(&b_name);
312 quote_two_c_style(&a_name, o->a_prefix, name_a, 0);
313 quote_two_c_style(&b_name, o->b_prefix, name_b, 0);
314
315 diff_populate_filespec(one, 0);
316 diff_populate_filespec(two, 0);
317 lc_a = count_lines(one->data, one->size);
318 lc_b = count_lines(two->data, two->size);
319 printf("%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
320 metainfo, a_name.buf, name_a_tab, reset,
321 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
322 print_line_count(lc_a);
323 printf(" +");
324 print_line_count(lc_b);
325 printf(" @@%s\n", reset);
326 if (lc_a)
327 copy_file('-', one->data, one->size, old, reset);
328 if (lc_b)
329 copy_file('+', two->data, two->size, new, reset);
330 }
331
332 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
333 {
334 if (!DIFF_FILE_VALID(one)) {
335 mf->ptr = (char *)""; /* does not matter */
336 mf->size = 0;
337 return 0;
338 }
339 else if (diff_populate_filespec(one, 0))
340 return -1;
341 mf->ptr = one->data;
342 mf->size = one->size;
343 return 0;
344 }
345
346 struct diff_words_buffer {
347 mmfile_t text;
348 long alloc;
349 long current; /* output pointer */
350 int suppressed_newline;
351 };
352
353 static void diff_words_append(char *line, unsigned long len,
354 struct diff_words_buffer *buffer)
355 {
356 if (buffer->text.size + len > buffer->alloc) {
357 buffer->alloc = (buffer->text.size + len) * 3 / 2;
358 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
359 }
360 line++;
361 len--;
362 memcpy(buffer->text.ptr + buffer->text.size, line, len);
363 buffer->text.size += len;
364 }
365
366 struct diff_words_data {
367 struct xdiff_emit_state xm;
368 struct diff_words_buffer minus, plus;
369 };
370
371 static void print_word(struct diff_words_buffer *buffer, int len, int color,
372 int suppress_newline)
373 {
374 const char *ptr;
375 int eol = 0;
376
377 if (len == 0)
378 return;
379
380 ptr = buffer->text.ptr + buffer->current;
381 buffer->current += len;
382
383 if (ptr[len - 1] == '\n') {
384 eol = 1;
385 len--;
386 }
387
388 fputs(diff_get_color(1, color), stdout);
389 fwrite(ptr, len, 1, stdout);
390 fputs(diff_get_color(1, DIFF_RESET), stdout);
391
392 if (eol) {
393 if (suppress_newline)
394 buffer->suppressed_newline = 1;
395 else
396 putchar('\n');
397 }
398 }
399
400 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
401 {
402 struct diff_words_data *diff_words = priv;
403
404 if (diff_words->minus.suppressed_newline) {
405 if (line[0] != '+')
406 putchar('\n');
407 diff_words->minus.suppressed_newline = 0;
408 }
409
410 len--;
411 switch (line[0]) {
412 case '-':
413 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
414 break;
415 case '+':
416 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
417 break;
418 case ' ':
419 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
420 diff_words->minus.current += len;
421 break;
422 }
423 }
424
425 /* this executes the word diff on the accumulated buffers */
426 static void diff_words_show(struct diff_words_data *diff_words)
427 {
428 xpparam_t xpp;
429 xdemitconf_t xecfg;
430 xdemitcb_t ecb;
431 mmfile_t minus, plus;
432 int i;
433
434 memset(&xecfg, 0, sizeof(xecfg));
435 minus.size = diff_words->minus.text.size;
436 minus.ptr = xmalloc(minus.size);
437 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
438 for (i = 0; i < minus.size; i++)
439 if (isspace(minus.ptr[i]))
440 minus.ptr[i] = '\n';
441 diff_words->minus.current = 0;
442
443 plus.size = diff_words->plus.text.size;
444 plus.ptr = xmalloc(plus.size);
445 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
446 for (i = 0; i < plus.size; i++)
447 if (isspace(plus.ptr[i]))
448 plus.ptr[i] = '\n';
449 diff_words->plus.current = 0;
450
451 xpp.flags = XDF_NEED_MINIMAL;
452 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
453 ecb.outf = xdiff_outf;
454 ecb.priv = diff_words;
455 diff_words->xm.consume = fn_out_diff_words_aux;
456 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
457
458 free(minus.ptr);
459 free(plus.ptr);
460 diff_words->minus.text.size = diff_words->plus.text.size = 0;
461
462 if (diff_words->minus.suppressed_newline) {
463 putchar('\n');
464 diff_words->minus.suppressed_newline = 0;
465 }
466 }
467
468 struct emit_callback {
469 struct xdiff_emit_state xm;
470 int nparents, color_diff;
471 unsigned ws_rule;
472 const char **label_path;
473 struct diff_words_data *diff_words;
474 int *found_changesp;
475 };
476
477 static void free_diff_words_data(struct emit_callback *ecbdata)
478 {
479 if (ecbdata->diff_words) {
480 /* flush buffers */
481 if (ecbdata->diff_words->minus.text.size ||
482 ecbdata->diff_words->plus.text.size)
483 diff_words_show(ecbdata->diff_words);
484
485 if (ecbdata->diff_words->minus.text.ptr)
486 free (ecbdata->diff_words->minus.text.ptr);
487 if (ecbdata->diff_words->plus.text.ptr)
488 free (ecbdata->diff_words->plus.text.ptr);
489 free(ecbdata->diff_words);
490 ecbdata->diff_words = NULL;
491 }
492 }
493
494 const char *diff_get_color(int diff_use_color, enum color_diff ix)
495 {
496 if (diff_use_color)
497 return diff_colors[ix];
498 return "";
499 }
500
501 static void emit_line(const char *set, const char *reset, const char *line, int len)
502 {
503 fputs(set, stdout);
504 fwrite(line, len, 1, stdout);
505 fputs(reset, stdout);
506 }
507
508 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
509 {
510 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
511 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
512
513 if (!*ws)
514 emit_line(set, reset, line, len);
515 else {
516 /* Emit just the prefix, then the rest. */
517 emit_line(set, reset, line, ecbdata->nparents);
518 (void)check_and_emit_line(line + ecbdata->nparents,
519 len - ecbdata->nparents, ecbdata->ws_rule,
520 stdout, set, reset, ws);
521 }
522 }
523
524 static void fn_out_consume(void *priv, char *line, unsigned long len)
525 {
526 int i;
527 int color;
528 struct emit_callback *ecbdata = priv;
529 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
530 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
531
532 *(ecbdata->found_changesp) = 1;
533
534 if (ecbdata->label_path[0]) {
535 const char *name_a_tab, *name_b_tab;
536
537 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
538 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
539
540 printf("%s--- %s%s%s\n",
541 set, ecbdata->label_path[0], reset, name_a_tab);
542 printf("%s+++ %s%s%s\n",
543 set, ecbdata->label_path[1], reset, name_b_tab);
544 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
545 }
546
547 /* This is not really necessary for now because
548 * this codepath only deals with two-way diffs.
549 */
550 for (i = 0; i < len && line[i] == '@'; i++)
551 ;
552 if (2 <= i && i < len && line[i] == ' ') {
553 ecbdata->nparents = i - 1;
554 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
555 reset, line, len);
556 return;
557 }
558
559 if (len < ecbdata->nparents) {
560 set = reset;
561 emit_line(reset, reset, line, len);
562 return;
563 }
564
565 color = DIFF_PLAIN;
566 if (ecbdata->diff_words && ecbdata->nparents != 1)
567 /* fall back to normal diff */
568 free_diff_words_data(ecbdata);
569 if (ecbdata->diff_words) {
570 if (line[0] == '-') {
571 diff_words_append(line, len,
572 &ecbdata->diff_words->minus);
573 return;
574 } else if (line[0] == '+') {
575 diff_words_append(line, len,
576 &ecbdata->diff_words->plus);
577 return;
578 }
579 if (ecbdata->diff_words->minus.text.size ||
580 ecbdata->diff_words->plus.text.size)
581 diff_words_show(ecbdata->diff_words);
582 line++;
583 len--;
584 emit_line(set, reset, line, len);
585 return;
586 }
587 for (i = 0; i < ecbdata->nparents && len; i++) {
588 if (line[i] == '-')
589 color = DIFF_FILE_OLD;
590 else if (line[i] == '+')
591 color = DIFF_FILE_NEW;
592 }
593
594 if (color != DIFF_FILE_NEW) {
595 emit_line(diff_get_color(ecbdata->color_diff, color),
596 reset, line, len);
597 return;
598 }
599 emit_add_line(reset, ecbdata, line, len);
600 }
601
602 static char *pprint_rename(const char *a, const char *b)
603 {
604 const char *old = a;
605 const char *new = b;
606 struct strbuf name;
607 int pfx_length, sfx_length;
608 int len_a = strlen(a);
609 int len_b = strlen(b);
610 int a_midlen, b_midlen;
611 int qlen_a = quote_c_style(a, NULL, NULL, 0);
612 int qlen_b = quote_c_style(b, NULL, NULL, 0);
613
614 strbuf_init(&name, 0);
615 if (qlen_a || qlen_b) {
616 quote_c_style(a, &name, NULL, 0);
617 strbuf_addstr(&name, " => ");
618 quote_c_style(b, &name, NULL, 0);
619 return strbuf_detach(&name, NULL);
620 }
621
622 /* Find common prefix */
623 pfx_length = 0;
624 while (*old && *new && *old == *new) {
625 if (*old == '/')
626 pfx_length = old - a + 1;
627 old++;
628 new++;
629 }
630
631 /* Find common suffix */
632 old = a + len_a;
633 new = b + len_b;
634 sfx_length = 0;
635 while (a <= old && b <= new && *old == *new) {
636 if (*old == '/')
637 sfx_length = len_a - (old - a);
638 old--;
639 new--;
640 }
641
642 /*
643 * pfx{mid-a => mid-b}sfx
644 * {pfx-a => pfx-b}sfx
645 * pfx{sfx-a => sfx-b}
646 * name-a => name-b
647 */
648 a_midlen = len_a - pfx_length - sfx_length;
649 b_midlen = len_b - pfx_length - sfx_length;
650 if (a_midlen < 0)
651 a_midlen = 0;
652 if (b_midlen < 0)
653 b_midlen = 0;
654
655 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
656 if (pfx_length + sfx_length) {
657 strbuf_add(&name, a, pfx_length);
658 strbuf_addch(&name, '{');
659 }
660 strbuf_add(&name, a + pfx_length, a_midlen);
661 strbuf_addstr(&name, " => ");
662 strbuf_add(&name, b + pfx_length, b_midlen);
663 if (pfx_length + sfx_length) {
664 strbuf_addch(&name, '}');
665 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
666 }
667 return strbuf_detach(&name, NULL);
668 }
669
670 struct diffstat_t {
671 struct xdiff_emit_state xm;
672
673 int nr;
674 int alloc;
675 struct diffstat_file {
676 char *from_name;
677 char *name;
678 char *print_name;
679 unsigned is_unmerged:1;
680 unsigned is_binary:1;
681 unsigned is_renamed:1;
682 unsigned int added, deleted;
683 } **files;
684 };
685
686 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
687 const char *name_a,
688 const char *name_b)
689 {
690 struct diffstat_file *x;
691 x = xcalloc(sizeof (*x), 1);
692 if (diffstat->nr == diffstat->alloc) {
693 diffstat->alloc = alloc_nr(diffstat->alloc);
694 diffstat->files = xrealloc(diffstat->files,
695 diffstat->alloc * sizeof(x));
696 }
697 diffstat->files[diffstat->nr++] = x;
698 if (name_b) {
699 x->from_name = xstrdup(name_a);
700 x->name = xstrdup(name_b);
701 x->is_renamed = 1;
702 }
703 else {
704 x->from_name = NULL;
705 x->name = xstrdup(name_a);
706 }
707 return x;
708 }
709
710 static void diffstat_consume(void *priv, char *line, unsigned long len)
711 {
712 struct diffstat_t *diffstat = priv;
713 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
714
715 if (line[0] == '+')
716 x->added++;
717 else if (line[0] == '-')
718 x->deleted++;
719 }
720
721 const char mime_boundary_leader[] = "------------";
722
723 static int scale_linear(int it, int width, int max_change)
724 {
725 /*
726 * make sure that at least one '-' is printed if there were deletions,
727 * and likewise for '+'.
728 */
729 if (max_change < 2)
730 return it;
731 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
732 }
733
734 static void show_name(const char *prefix, const char *name, int len,
735 const char *reset, const char *set)
736 {
737 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
738 }
739
740 static void show_graph(char ch, int cnt, const char *set, const char *reset)
741 {
742 if (cnt <= 0)
743 return;
744 printf("%s", set);
745 while (cnt--)
746 putchar(ch);
747 printf("%s", reset);
748 }
749
750 static void fill_print_name(struct diffstat_file *file)
751 {
752 char *pname;
753
754 if (file->print_name)
755 return;
756
757 if (!file->is_renamed) {
758 struct strbuf buf;
759 strbuf_init(&buf, 0);
760 if (quote_c_style(file->name, &buf, NULL, 0)) {
761 pname = strbuf_detach(&buf, NULL);
762 } else {
763 pname = file->name;
764 strbuf_release(&buf);
765 }
766 } else {
767 pname = pprint_rename(file->from_name, file->name);
768 }
769 file->print_name = pname;
770 }
771
772 static void show_stats(struct diffstat_t* data, struct diff_options *options)
773 {
774 int i, len, add, del, total, adds = 0, dels = 0;
775 int max_change = 0, max_len = 0;
776 int total_files = data->nr;
777 int width, name_width;
778 const char *reset, *set, *add_c, *del_c;
779
780 if (data->nr == 0)
781 return;
782
783 width = options->stat_width ? options->stat_width : 80;
784 name_width = options->stat_name_width ? options->stat_name_width : 50;
785
786 /* Sanity: give at least 5 columns to the graph,
787 * but leave at least 10 columns for the name.
788 */
789 if (width < name_width + 15) {
790 if (name_width <= 25)
791 width = name_width + 15;
792 else
793 name_width = width - 15;
794 }
795
796 /* Find the longest filename and max number of changes */
797 reset = diff_get_color_opt(options, DIFF_RESET);
798 set = diff_get_color_opt(options, DIFF_PLAIN);
799 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
800 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
801
802 for (i = 0; i < data->nr; i++) {
803 struct diffstat_file *file = data->files[i];
804 int change = file->added + file->deleted;
805 fill_print_name(file);
806 len = strlen(file->print_name);
807 if (max_len < len)
808 max_len = len;
809
810 if (file->is_binary || file->is_unmerged)
811 continue;
812 if (max_change < change)
813 max_change = change;
814 }
815
816 /* Compute the width of the graph part;
817 * 10 is for one blank at the beginning of the line plus
818 * " | count " between the name and the graph.
819 *
820 * From here on, name_width is the width of the name area,
821 * and width is the width of the graph area.
822 */
823 name_width = (name_width < max_len) ? name_width : max_len;
824 if (width < (name_width + 10) + max_change)
825 width = width - (name_width + 10);
826 else
827 width = max_change;
828
829 for (i = 0; i < data->nr; i++) {
830 const char *prefix = "";
831 char *name = data->files[i]->print_name;
832 int added = data->files[i]->added;
833 int deleted = data->files[i]->deleted;
834 int name_len;
835
836 /*
837 * "scale" the filename
838 */
839 len = name_width;
840 name_len = strlen(name);
841 if (name_width < name_len) {
842 char *slash;
843 prefix = "...";
844 len -= 3;
845 name += name_len - len;
846 slash = strchr(name, '/');
847 if (slash)
848 name = slash;
849 }
850
851 if (data->files[i]->is_binary) {
852 show_name(prefix, name, len, reset, set);
853 printf(" Bin ");
854 printf("%s%d%s", del_c, deleted, reset);
855 printf(" -> ");
856 printf("%s%d%s", add_c, added, reset);
857 printf(" bytes");
858 printf("\n");
859 continue;
860 }
861 else if (data->files[i]->is_unmerged) {
862 show_name(prefix, name, len, reset, set);
863 printf(" Unmerged\n");
864 continue;
865 }
866 else if (!data->files[i]->is_renamed &&
867 (added + deleted == 0)) {
868 total_files--;
869 continue;
870 }
871
872 /*
873 * scale the add/delete
874 */
875 add = added;
876 del = deleted;
877 total = add + del;
878 adds += add;
879 dels += del;
880
881 if (width <= max_change) {
882 add = scale_linear(add, width, max_change);
883 del = scale_linear(del, width, max_change);
884 total = add + del;
885 }
886 show_name(prefix, name, len, reset, set);
887 printf("%5d ", added + deleted);
888 show_graph('+', add, add_c, reset);
889 show_graph('-', del, del_c, reset);
890 putchar('\n');
891 }
892 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
893 set, total_files, adds, dels, reset);
894 }
895
896 static void show_shortstats(struct diffstat_t* data)
897 {
898 int i, adds = 0, dels = 0, total_files = data->nr;
899
900 if (data->nr == 0)
901 return;
902
903 for (i = 0; i < data->nr; i++) {
904 if (!data->files[i]->is_binary &&
905 !data->files[i]->is_unmerged) {
906 int added = data->files[i]->added;
907 int deleted= data->files[i]->deleted;
908 if (!data->files[i]->is_renamed &&
909 (added + deleted == 0)) {
910 total_files--;
911 } else {
912 adds += added;
913 dels += deleted;
914 }
915 }
916 }
917 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
918 total_files, adds, dels);
919 }
920
921 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
922 {
923 int i;
924
925 if (data->nr == 0)
926 return;
927
928 for (i = 0; i < data->nr; i++) {
929 struct diffstat_file *file = data->files[i];
930
931 if (file->is_binary)
932 printf("-\t-\t");
933 else
934 printf("%d\t%d\t", file->added, file->deleted);
935 if (options->line_termination) {
936 fill_print_name(file);
937 if (!file->is_renamed)
938 write_name_quoted(file->name, stdout,
939 options->line_termination);
940 else {
941 fputs(file->print_name, stdout);
942 putchar(options->line_termination);
943 }
944 } else {
945 if (file->is_renamed) {
946 putchar('\0');
947 write_name_quoted(file->from_name, stdout, '\0');
948 }
949 write_name_quoted(file->name, stdout, '\0');
950 }
951 }
952 }
953
954 static void free_diffstat_info(struct diffstat_t *diffstat)
955 {
956 int i;
957 for (i = 0; i < diffstat->nr; i++) {
958 struct diffstat_file *f = diffstat->files[i];
959 if (f->name != f->print_name)
960 free(f->print_name);
961 free(f->name);
962 free(f->from_name);
963 free(f);
964 }
965 free(diffstat->files);
966 }
967
968 struct checkdiff_t {
969 struct xdiff_emit_state xm;
970 const char *filename;
971 int lineno, color_diff;
972 unsigned ws_rule;
973 unsigned status;
974 };
975
976 static void checkdiff_consume(void *priv, char *line, unsigned long len)
977 {
978 struct checkdiff_t *data = priv;
979 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
980 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
981 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
982 char *err;
983
984 if (line[0] == '+') {
985 data->status = check_and_emit_line(line + 1, len - 1,
986 data->ws_rule, NULL, NULL, NULL, NULL);
987 if (!data->status)
988 return;
989 err = whitespace_error_string(data->status);
990 printf("%s:%d: %s.\n", data->filename, data->lineno, err);
991 free(err);
992 emit_line(set, reset, line, 1);
993 (void)check_and_emit_line(line + 1, len - 1, data->ws_rule,
994 stdout, set, reset, ws);
995 data->lineno++;
996 } else if (line[0] == ' ')
997 data->lineno++;
998 else if (line[0] == '@') {
999 char *plus = strchr(line, '+');
1000 if (plus)
1001 data->lineno = strtol(plus, NULL, 10);
1002 else
1003 die("invalid diff");
1004 }
1005 }
1006
1007 static unsigned char *deflate_it(char *data,
1008 unsigned long size,
1009 unsigned long *result_size)
1010 {
1011 int bound;
1012 unsigned char *deflated;
1013 z_stream stream;
1014
1015 memset(&stream, 0, sizeof(stream));
1016 deflateInit(&stream, zlib_compression_level);
1017 bound = deflateBound(&stream, size);
1018 deflated = xmalloc(bound);
1019 stream.next_out = deflated;
1020 stream.avail_out = bound;
1021
1022 stream.next_in = (unsigned char *)data;
1023 stream.avail_in = size;
1024 while (deflate(&stream, Z_FINISH) == Z_OK)
1025 ; /* nothing */
1026 deflateEnd(&stream);
1027 *result_size = stream.total_out;
1028 return deflated;
1029 }
1030
1031 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1032 {
1033 void *cp;
1034 void *delta;
1035 void *deflated;
1036 void *data;
1037 unsigned long orig_size;
1038 unsigned long delta_size;
1039 unsigned long deflate_size;
1040 unsigned long data_size;
1041
1042 /* We could do deflated delta, or we could do just deflated two,
1043 * whichever is smaller.
1044 */
1045 delta = NULL;
1046 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1047 if (one->size && two->size) {
1048 delta = diff_delta(one->ptr, one->size,
1049 two->ptr, two->size,
1050 &delta_size, deflate_size);
1051 if (delta) {
1052 void *to_free = delta;
1053 orig_size = delta_size;
1054 delta = deflate_it(delta, delta_size, &delta_size);
1055 free(to_free);
1056 }
1057 }
1058
1059 if (delta && delta_size < deflate_size) {
1060 printf("delta %lu\n", orig_size);
1061 free(deflated);
1062 data = delta;
1063 data_size = delta_size;
1064 }
1065 else {
1066 printf("literal %lu\n", two->size);
1067 free(delta);
1068 data = deflated;
1069 data_size = deflate_size;
1070 }
1071
1072 /* emit data encoded in base85 */
1073 cp = data;
1074 while (data_size) {
1075 int bytes = (52 < data_size) ? 52 : data_size;
1076 char line[70];
1077 data_size -= bytes;
1078 if (bytes <= 26)
1079 line[0] = bytes + 'A' - 1;
1080 else
1081 line[0] = bytes - 26 + 'a' - 1;
1082 encode_85(line + 1, cp, bytes);
1083 cp = (char *) cp + bytes;
1084 puts(line);
1085 }
1086 printf("\n");
1087 free(data);
1088 }
1089
1090 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1091 {
1092 printf("GIT binary patch\n");
1093 emit_binary_diff_body(one, two);
1094 emit_binary_diff_body(two, one);
1095 }
1096
1097 static void setup_diff_attr_check(struct git_attr_check *check)
1098 {
1099 static struct git_attr *attr_diff;
1100
1101 if (!attr_diff) {
1102 attr_diff = git_attr("diff", 4);
1103 }
1104 check[0].attr = attr_diff;
1105 }
1106
1107 static void diff_filespec_check_attr(struct diff_filespec *one)
1108 {
1109 struct git_attr_check attr_diff_check;
1110 int check_from_data = 0;
1111
1112 if (one->checked_attr)
1113 return;
1114
1115 setup_diff_attr_check(&attr_diff_check);
1116 one->is_binary = 0;
1117 one->funcname_pattern_ident = NULL;
1118
1119 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1120 const char *value;
1121
1122 /* binaryness */
1123 value = attr_diff_check.value;
1124 if (ATTR_TRUE(value))
1125 ;
1126 else if (ATTR_FALSE(value))
1127 one->is_binary = 1;
1128 else
1129 check_from_data = 1;
1130
1131 /* funcname pattern ident */
1132 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1133 ;
1134 else
1135 one->funcname_pattern_ident = value;
1136 }
1137
1138 if (check_from_data) {
1139 if (!one->data && DIFF_FILE_VALID(one))
1140 diff_populate_filespec(one, 0);
1141
1142 if (one->data)
1143 one->is_binary = buffer_is_binary(one->data, one->size);
1144 }
1145 }
1146
1147 int diff_filespec_is_binary(struct diff_filespec *one)
1148 {
1149 diff_filespec_check_attr(one);
1150 return one->is_binary;
1151 }
1152
1153 static const char *funcname_pattern(const char *ident)
1154 {
1155 struct funcname_pattern *pp;
1156
1157 read_config_if_needed();
1158 for (pp = funcname_pattern_list; pp; pp = pp->next)
1159 if (!strcmp(ident, pp->name))
1160 return pp->pattern;
1161 return NULL;
1162 }
1163
1164 static struct builtin_funcname_pattern {
1165 const char *name;
1166 const char *pattern;
1167 } builtin_funcname_pattern[] = {
1168 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1169 "new\\|return\\|switch\\|throw\\|while\\)\n"
1170 "^[ ]*\\(\\([ ]*"
1171 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1172 "[ ]*([^;]*$\\)" },
1173 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1174 };
1175
1176 static const char *diff_funcname_pattern(struct diff_filespec *one)
1177 {
1178 const char *ident, *pattern;
1179 int i;
1180
1181 diff_filespec_check_attr(one);
1182 ident = one->funcname_pattern_ident;
1183
1184 if (!ident)
1185 /*
1186 * If the config file has "funcname.default" defined, that
1187 * regexp is used; otherwise NULL is returned and xemit uses
1188 * the built-in default.
1189 */
1190 return funcname_pattern("default");
1191
1192 /* Look up custom "funcname.$ident" regexp from config. */
1193 pattern = funcname_pattern(ident);
1194 if (pattern)
1195 return pattern;
1196
1197 /*
1198 * And define built-in fallback patterns here. Note that
1199 * these can be overriden by the user's config settings.
1200 */
1201 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1202 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1203 return builtin_funcname_pattern[i].pattern;
1204
1205 return NULL;
1206 }
1207
1208 static void builtin_diff(const char *name_a,
1209 const char *name_b,
1210 struct diff_filespec *one,
1211 struct diff_filespec *two,
1212 const char *xfrm_msg,
1213 struct diff_options *o,
1214 int complete_rewrite)
1215 {
1216 mmfile_t mf1, mf2;
1217 const char *lbl[2];
1218 char *a_one, *b_two;
1219 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1220 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1221
1222 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1223 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
1224 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1225 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1226 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1227 if (lbl[0][0] == '/') {
1228 /* /dev/null */
1229 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1230 if (xfrm_msg && xfrm_msg[0])
1231 printf("%s%s%s\n", set, xfrm_msg, reset);
1232 }
1233 else if (lbl[1][0] == '/') {
1234 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1235 if (xfrm_msg && xfrm_msg[0])
1236 printf("%s%s%s\n", set, xfrm_msg, reset);
1237 }
1238 else {
1239 if (one->mode != two->mode) {
1240 printf("%sold mode %06o%s\n", set, one->mode, reset);
1241 printf("%snew mode %06o%s\n", set, two->mode, reset);
1242 }
1243 if (xfrm_msg && xfrm_msg[0])
1244 printf("%s%s%s\n", set, xfrm_msg, reset);
1245 /*
1246 * we do not run diff between different kind
1247 * of objects.
1248 */
1249 if ((one->mode ^ two->mode) & S_IFMT)
1250 goto free_ab_and_return;
1251 if (complete_rewrite) {
1252 emit_rewrite_diff(name_a, name_b, one, two, o);
1253 o->found_changes = 1;
1254 goto free_ab_and_return;
1255 }
1256 }
1257
1258 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1259 die("unable to read files to diff");
1260
1261 if (!DIFF_OPT_TST(o, TEXT) &&
1262 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1263 /* Quite common confusing case */
1264 if (mf1.size == mf2.size &&
1265 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1266 goto free_ab_and_return;
1267 if (DIFF_OPT_TST(o, BINARY))
1268 emit_binary_diff(&mf1, &mf2);
1269 else
1270 printf("Binary files %s and %s differ\n",
1271 lbl[0], lbl[1]);
1272 o->found_changes = 1;
1273 }
1274 else {
1275 /* Crazy xdl interfaces.. */
1276 const char *diffopts = getenv("GIT_DIFF_OPTS");
1277 xpparam_t xpp;
1278 xdemitconf_t xecfg;
1279 xdemitcb_t ecb;
1280 struct emit_callback ecbdata;
1281 const char *funcname_pattern;
1282
1283 funcname_pattern = diff_funcname_pattern(one);
1284 if (!funcname_pattern)
1285 funcname_pattern = diff_funcname_pattern(two);
1286
1287 memset(&xecfg, 0, sizeof(xecfg));
1288 memset(&ecbdata, 0, sizeof(ecbdata));
1289 ecbdata.label_path = lbl;
1290 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1291 ecbdata.found_changesp = &o->found_changes;
1292 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1293 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1294 xecfg.ctxlen = o->context;
1295 xecfg.flags = XDL_EMIT_FUNCNAMES;
1296 if (funcname_pattern)
1297 xdiff_set_find_func(&xecfg, funcname_pattern);
1298 if (!diffopts)
1299 ;
1300 else if (!prefixcmp(diffopts, "--unified="))
1301 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1302 else if (!prefixcmp(diffopts, "-u"))
1303 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1304 ecb.outf = xdiff_outf;
1305 ecb.priv = &ecbdata;
1306 ecbdata.xm.consume = fn_out_consume;
1307 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1308 ecbdata.diff_words =
1309 xcalloc(1, sizeof(struct diff_words_data));
1310 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1311 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1312 free_diff_words_data(&ecbdata);
1313 }
1314
1315 free_ab_and_return:
1316 diff_free_filespec_data(one);
1317 diff_free_filespec_data(two);
1318 free(a_one);
1319 free(b_two);
1320 return;
1321 }
1322
1323 static void builtin_diffstat(const char *name_a, const char *name_b,
1324 struct diff_filespec *one,
1325 struct diff_filespec *two,
1326 struct diffstat_t *diffstat,
1327 struct diff_options *o,
1328 int complete_rewrite)
1329 {
1330 mmfile_t mf1, mf2;
1331 struct diffstat_file *data;
1332
1333 data = diffstat_add(diffstat, name_a, name_b);
1334
1335 if (!one || !two) {
1336 data->is_unmerged = 1;
1337 return;
1338 }
1339 if (complete_rewrite) {
1340 diff_populate_filespec(one, 0);
1341 diff_populate_filespec(two, 0);
1342 data->deleted = count_lines(one->data, one->size);
1343 data->added = count_lines(two->data, two->size);
1344 goto free_and_return;
1345 }
1346 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1347 die("unable to read files to diff");
1348
1349 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1350 data->is_binary = 1;
1351 data->added = mf2.size;
1352 data->deleted = mf1.size;
1353 } else {
1354 /* Crazy xdl interfaces.. */
1355 xpparam_t xpp;
1356 xdemitconf_t xecfg;
1357 xdemitcb_t ecb;
1358
1359 memset(&xecfg, 0, sizeof(xecfg));
1360 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1361 ecb.outf = xdiff_outf;
1362 ecb.priv = diffstat;
1363 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1364 }
1365
1366 free_and_return:
1367 diff_free_filespec_data(one);
1368 diff_free_filespec_data(two);
1369 }
1370
1371 static void builtin_checkdiff(const char *name_a, const char *name_b,
1372 struct diff_filespec *one,
1373 struct diff_filespec *two, struct diff_options *o)
1374 {
1375 mmfile_t mf1, mf2;
1376 struct checkdiff_t data;
1377
1378 if (!two)
1379 return;
1380
1381 memset(&data, 0, sizeof(data));
1382 data.xm.consume = checkdiff_consume;
1383 data.filename = name_b ? name_b : name_a;
1384 data.lineno = 0;
1385 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1386 data.ws_rule = whitespace_rule(data.filename);
1387
1388 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1389 die("unable to read files to diff");
1390
1391 if (diff_filespec_is_binary(two))
1392 goto free_and_return;
1393 else {
1394 /* Crazy xdl interfaces.. */
1395 xpparam_t xpp;
1396 xdemitconf_t xecfg;
1397 xdemitcb_t ecb;
1398
1399 memset(&xecfg, 0, sizeof(xecfg));
1400 xpp.flags = XDF_NEED_MINIMAL;
1401 ecb.outf = xdiff_outf;
1402 ecb.priv = &data;
1403 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1404 }
1405 free_and_return:
1406 diff_free_filespec_data(one);
1407 diff_free_filespec_data(two);
1408 if (data.status)
1409 DIFF_OPT_SET(o, CHECK_FAILED);
1410 }
1411
1412 struct diff_filespec *alloc_filespec(const char *path)
1413 {
1414 int namelen = strlen(path);
1415 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1416
1417 memset(spec, 0, sizeof(*spec));
1418 spec->path = (char *)(spec + 1);
1419 memcpy(spec->path, path, namelen+1);
1420 spec->count = 1;
1421 return spec;
1422 }
1423
1424 void free_filespec(struct diff_filespec *spec)
1425 {
1426 if (!--spec->count) {
1427 diff_free_filespec_data(spec);
1428 free(spec);
1429 }
1430 }
1431
1432 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1433 unsigned short mode)
1434 {
1435 if (mode) {
1436 spec->mode = canon_mode(mode);
1437 hashcpy(spec->sha1, sha1);
1438 spec->sha1_valid = !is_null_sha1(sha1);
1439 }
1440 }
1441
1442 /*
1443 * Given a name and sha1 pair, if the index tells us the file in
1444 * the work tree has that object contents, return true, so that
1445 * prepare_temp_file() does not have to inflate and extract.
1446 */
1447 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1448 {
1449 struct cache_entry *ce;
1450 struct stat st;
1451 int pos, len;
1452
1453 /* We do not read the cache ourselves here, because the
1454 * benchmark with my previous version that always reads cache
1455 * shows that it makes things worse for diff-tree comparing
1456 * two linux-2.6 kernel trees in an already checked out work
1457 * tree. This is because most diff-tree comparisons deal with
1458 * only a small number of files, while reading the cache is
1459 * expensive for a large project, and its cost outweighs the
1460 * savings we get by not inflating the object to a temporary
1461 * file. Practically, this code only helps when we are used
1462 * by diff-cache --cached, which does read the cache before
1463 * calling us.
1464 */
1465 if (!active_cache)
1466 return 0;
1467
1468 /* We want to avoid the working directory if our caller
1469 * doesn't need the data in a normal file, this system
1470 * is rather slow with its stat/open/mmap/close syscalls,
1471 * and the object is contained in a pack file. The pack
1472 * is probably already open and will be faster to obtain
1473 * the data through than the working directory. Loose
1474 * objects however would tend to be slower as they need
1475 * to be individually opened and inflated.
1476 */
1477 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1478 return 0;
1479
1480 len = strlen(name);
1481 pos = cache_name_pos(name, len);
1482 if (pos < 0)
1483 return 0;
1484 ce = active_cache[pos];
1485 if ((lstat(name, &st) < 0) ||
1486 !S_ISREG(st.st_mode) || /* careful! */
1487 ce_match_stat(ce, &st, 0) ||
1488 hashcmp(sha1, ce->sha1))
1489 return 0;
1490 /* we return 1 only when we can stat, it is a regular file,
1491 * stat information matches, and sha1 recorded in the cache
1492 * matches. I.e. we know the file in the work tree really is
1493 * the same as the <name, sha1> pair.
1494 */
1495 return 1;
1496 }
1497
1498 static int populate_from_stdin(struct diff_filespec *s)
1499 {
1500 struct strbuf buf;
1501 size_t size = 0;
1502
1503 strbuf_init(&buf, 0);
1504 if (strbuf_read(&buf, 0, 0) < 0)
1505 return error("error while reading from stdin %s",
1506 strerror(errno));
1507
1508 s->should_munmap = 0;
1509 s->data = strbuf_detach(&buf, &size);
1510 s->size = size;
1511 s->should_free = 1;
1512 return 0;
1513 }
1514
1515 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1516 {
1517 int len;
1518 char *data = xmalloc(100);
1519 len = snprintf(data, 100,
1520 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1521 s->data = data;
1522 s->size = len;
1523 s->should_free = 1;
1524 if (size_only) {
1525 s->data = NULL;
1526 free(data);
1527 }
1528 return 0;
1529 }
1530
1531 /*
1532 * While doing rename detection and pickaxe operation, we may need to
1533 * grab the data for the blob (or file) for our own in-core comparison.
1534 * diff_filespec has data and size fields for this purpose.
1535 */
1536 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1537 {
1538 int err = 0;
1539 if (!DIFF_FILE_VALID(s))
1540 die("internal error: asking to populate invalid file.");
1541 if (S_ISDIR(s->mode))
1542 return -1;
1543
1544 if (s->data)
1545 return 0;
1546
1547 if (size_only && 0 < s->size)
1548 return 0;
1549
1550 if (S_ISGITLINK(s->mode))
1551 return diff_populate_gitlink(s, size_only);
1552
1553 if (!s->sha1_valid ||
1554 reuse_worktree_file(s->path, s->sha1, 0)) {
1555 struct strbuf buf;
1556 struct stat st;
1557 int fd;
1558
1559 if (!strcmp(s->path, "-"))
1560 return populate_from_stdin(s);
1561
1562 if (lstat(s->path, &st) < 0) {
1563 if (errno == ENOENT) {
1564 err_empty:
1565 err = -1;
1566 empty:
1567 s->data = (char *)"";
1568 s->size = 0;
1569 return err;
1570 }
1571 }
1572 s->size = xsize_t(st.st_size);
1573 if (!s->size)
1574 goto empty;
1575 if (size_only)
1576 return 0;
1577 if (S_ISLNK(st.st_mode)) {
1578 int ret;
1579 s->data = xmalloc(s->size);
1580 s->should_free = 1;
1581 ret = readlink(s->path, s->data, s->size);
1582 if (ret < 0) {
1583 free(s->data);
1584 goto err_empty;
1585 }
1586 return 0;
1587 }
1588 fd = open(s->path, O_RDONLY);
1589 if (fd < 0)
1590 goto err_empty;
1591 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1592 close(fd);
1593 s->should_munmap = 1;
1594
1595 /*
1596 * Convert from working tree format to canonical git format
1597 */
1598 strbuf_init(&buf, 0);
1599 if (convert_to_git(s->path, s->data, s->size, &buf)) {
1600 size_t size = 0;
1601 munmap(s->data, s->size);
1602 s->should_munmap = 0;
1603 s->data = strbuf_detach(&buf, &size);
1604 s->size = size;
1605 s->should_free = 1;
1606 }
1607 }
1608 else {
1609 enum object_type type;
1610 if (size_only)
1611 type = sha1_object_info(s->sha1, &s->size);
1612 else {
1613 s->data = read_sha1_file(s->sha1, &type, &s->size);
1614 s->should_free = 1;
1615 }
1616 }
1617 return 0;
1618 }
1619
1620 void diff_free_filespec_blob(struct diff_filespec *s)
1621 {
1622 if (s->should_free)
1623 free(s->data);
1624 else if (s->should_munmap)
1625 munmap(s->data, s->size);
1626
1627 if (s->should_free || s->should_munmap) {
1628 s->should_free = s->should_munmap = 0;
1629 s->data = NULL;
1630 }
1631 }
1632
1633 void diff_free_filespec_data(struct diff_filespec *s)
1634 {
1635 diff_free_filespec_blob(s);
1636 free(s->cnt_data);
1637 s->cnt_data = NULL;
1638 }
1639
1640 static void prep_temp_blob(struct diff_tempfile *temp,
1641 void *blob,
1642 unsigned long size,
1643 const unsigned char *sha1,
1644 int mode)
1645 {
1646 int fd;
1647
1648 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1649 if (fd < 0)
1650 die("unable to create temp-file: %s", strerror(errno));
1651 if (write_in_full(fd, blob, size) != size)
1652 die("unable to write temp-file");
1653 close(fd);
1654 temp->name = temp->tmp_path;
1655 strcpy(temp->hex, sha1_to_hex(sha1));
1656 temp->hex[40] = 0;
1657 sprintf(temp->mode, "%06o", mode);
1658 }
1659
1660 static void prepare_temp_file(const char *name,
1661 struct diff_tempfile *temp,
1662 struct diff_filespec *one)
1663 {
1664 if (!DIFF_FILE_VALID(one)) {
1665 not_a_valid_file:
1666 /* A '-' entry produces this for file-2, and
1667 * a '+' entry produces this for file-1.
1668 */
1669 temp->name = "/dev/null";
1670 strcpy(temp->hex, ".");
1671 strcpy(temp->mode, ".");
1672 return;
1673 }
1674
1675 if (!one->sha1_valid ||
1676 reuse_worktree_file(name, one->sha1, 1)) {
1677 struct stat st;
1678 if (lstat(name, &st) < 0) {
1679 if (errno == ENOENT)
1680 goto not_a_valid_file;
1681 die("stat(%s): %s", name, strerror(errno));
1682 }
1683 if (S_ISLNK(st.st_mode)) {
1684 int ret;
1685 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1686 size_t sz = xsize_t(st.st_size);
1687 if (sizeof(buf) <= st.st_size)
1688 die("symlink too long: %s", name);
1689 ret = readlink(name, buf, sz);
1690 if (ret < 0)
1691 die("readlink(%s)", name);
1692 prep_temp_blob(temp, buf, sz,
1693 (one->sha1_valid ?
1694 one->sha1 : null_sha1),
1695 (one->sha1_valid ?
1696 one->mode : S_IFLNK));
1697 }
1698 else {
1699 /* we can borrow from the file in the work tree */
1700 temp->name = name;
1701 if (!one->sha1_valid)
1702 strcpy(temp->hex, sha1_to_hex(null_sha1));
1703 else
1704 strcpy(temp->hex, sha1_to_hex(one->sha1));
1705 /* Even though we may sometimes borrow the
1706 * contents from the work tree, we always want
1707 * one->mode. mode is trustworthy even when
1708 * !(one->sha1_valid), as long as
1709 * DIFF_FILE_VALID(one).
1710 */
1711 sprintf(temp->mode, "%06o", one->mode);
1712 }
1713 return;
1714 }
1715 else {
1716 if (diff_populate_filespec(one, 0))
1717 die("cannot read data blob for %s", one->path);
1718 prep_temp_blob(temp, one->data, one->size,
1719 one->sha1, one->mode);
1720 }
1721 }
1722
1723 static void remove_tempfile(void)
1724 {
1725 int i;
1726
1727 for (i = 0; i < 2; i++)
1728 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1729 unlink(diff_temp[i].name);
1730 diff_temp[i].name = NULL;
1731 }
1732 }
1733
1734 static void remove_tempfile_on_signal(int signo)
1735 {
1736 remove_tempfile();
1737 signal(SIGINT, SIG_DFL);
1738 raise(signo);
1739 }
1740
1741 /* An external diff command takes:
1742 *
1743 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1744 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1745 *
1746 */
1747 static void run_external_diff(const char *pgm,
1748 const char *name,
1749 const char *other,
1750 struct diff_filespec *one,
1751 struct diff_filespec *two,
1752 const char *xfrm_msg,
1753 int complete_rewrite)
1754 {
1755 const char *spawn_arg[10];
1756 struct diff_tempfile *temp = diff_temp;
1757 int retval;
1758 static int atexit_asked = 0;
1759 const char *othername;
1760 const char **arg = &spawn_arg[0];
1761
1762 othername = (other? other : name);
1763 if (one && two) {
1764 prepare_temp_file(name, &temp[0], one);
1765 prepare_temp_file(othername, &temp[1], two);
1766 if (! atexit_asked &&
1767 (temp[0].name == temp[0].tmp_path ||
1768 temp[1].name == temp[1].tmp_path)) {
1769 atexit_asked = 1;
1770 atexit(remove_tempfile);
1771 }
1772 signal(SIGINT, remove_tempfile_on_signal);
1773 }
1774
1775 if (one && two) {
1776 *arg++ = pgm;
1777 *arg++ = name;
1778 *arg++ = temp[0].name;
1779 *arg++ = temp[0].hex;
1780 *arg++ = temp[0].mode;
1781 *arg++ = temp[1].name;
1782 *arg++ = temp[1].hex;
1783 *arg++ = temp[1].mode;
1784 if (other) {
1785 *arg++ = other;
1786 *arg++ = xfrm_msg;
1787 }
1788 } else {
1789 *arg++ = pgm;
1790 *arg++ = name;
1791 }
1792 *arg = NULL;
1793 fflush(NULL);
1794 retval = run_command_v_opt(spawn_arg, 0);
1795 remove_tempfile();
1796 if (retval) {
1797 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1798 exit(1);
1799 }
1800 }
1801
1802 static const char *external_diff_attr(const char *name)
1803 {
1804 struct git_attr_check attr_diff_check;
1805
1806 setup_diff_attr_check(&attr_diff_check);
1807 if (!git_checkattr(name, 1, &attr_diff_check)) {
1808 const char *value = attr_diff_check.value;
1809 if (!ATTR_TRUE(value) &&
1810 !ATTR_FALSE(value) &&
1811 !ATTR_UNSET(value)) {
1812 struct ll_diff_driver *drv;
1813
1814 read_config_if_needed();
1815 for (drv = user_diff; drv; drv = drv->next)
1816 if (!strcmp(drv->name, value))
1817 return drv->cmd;
1818 }
1819 }
1820 return NULL;
1821 }
1822
1823 static void run_diff_cmd(const char *pgm,
1824 const char *name,
1825 const char *other,
1826 struct diff_filespec *one,
1827 struct diff_filespec *two,
1828 const char *xfrm_msg,
1829 struct diff_options *o,
1830 int complete_rewrite)
1831 {
1832 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
1833 pgm = NULL;
1834 else {
1835 const char *cmd = external_diff_attr(name);
1836 if (cmd)
1837 pgm = cmd;
1838 }
1839
1840 if (pgm) {
1841 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1842 complete_rewrite);
1843 return;
1844 }
1845 if (one && two)
1846 builtin_diff(name, other ? other : name,
1847 one, two, xfrm_msg, o, complete_rewrite);
1848 else
1849 printf("* Unmerged path %s\n", name);
1850 }
1851
1852 static void diff_fill_sha1_info(struct diff_filespec *one)
1853 {
1854 if (DIFF_FILE_VALID(one)) {
1855 if (!one->sha1_valid) {
1856 struct stat st;
1857 if (!strcmp(one->path, "-")) {
1858 hashcpy(one->sha1, null_sha1);
1859 return;
1860 }
1861 if (lstat(one->path, &st) < 0)
1862 die("stat %s", one->path);
1863 if (index_path(one->sha1, one->path, &st, 0))
1864 die("cannot hash %s\n", one->path);
1865 }
1866 }
1867 else
1868 hashclr(one->sha1);
1869 }
1870
1871 static int similarity_index(struct diff_filepair *p)
1872 {
1873 return p->score * 100 / MAX_SCORE;
1874 }
1875
1876 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1877 {
1878 const char *pgm = external_diff();
1879 struct strbuf msg;
1880 char *xfrm_msg;
1881 struct diff_filespec *one = p->one;
1882 struct diff_filespec *two = p->two;
1883 const char *name;
1884 const char *other;
1885 int complete_rewrite = 0;
1886
1887
1888 if (DIFF_PAIR_UNMERGED(p)) {
1889 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1890 return;
1891 }
1892
1893 name = p->one->path;
1894 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1895 diff_fill_sha1_info(one);
1896 diff_fill_sha1_info(two);
1897
1898 strbuf_init(&msg, PATH_MAX * 2 + 300);
1899 switch (p->status) {
1900 case DIFF_STATUS_COPIED:
1901 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1902 strbuf_addstr(&msg, "\ncopy from ");
1903 quote_c_style(name, &msg, NULL, 0);
1904 strbuf_addstr(&msg, "\ncopy to ");
1905 quote_c_style(other, &msg, NULL, 0);
1906 strbuf_addch(&msg, '\n');
1907 break;
1908 case DIFF_STATUS_RENAMED:
1909 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
1910 strbuf_addstr(&msg, "\nrename from ");
1911 quote_c_style(name, &msg, NULL, 0);
1912 strbuf_addstr(&msg, "\nrename to ");
1913 quote_c_style(other, &msg, NULL, 0);
1914 strbuf_addch(&msg, '\n');
1915 break;
1916 case DIFF_STATUS_MODIFIED:
1917 if (p->score) {
1918 strbuf_addf(&msg, "dissimilarity index %d%%\n",
1919 similarity_index(p));
1920 complete_rewrite = 1;
1921 break;
1922 }
1923 /* fallthru */
1924 default:
1925 /* nothing */
1926 ;
1927 }
1928
1929 if (hashcmp(one->sha1, two->sha1)) {
1930 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
1931
1932 if (DIFF_OPT_TST(o, BINARY)) {
1933 mmfile_t mf;
1934 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
1935 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
1936 abbrev = 40;
1937 }
1938 strbuf_addf(&msg, "index %.*s..%.*s",
1939 abbrev, sha1_to_hex(one->sha1),
1940 abbrev, sha1_to_hex(two->sha1));
1941 if (one->mode == two->mode)
1942 strbuf_addf(&msg, " %06o", one->mode);
1943 strbuf_addch(&msg, '\n');
1944 }
1945
1946 if (msg.len)
1947 strbuf_setlen(&msg, msg.len - 1);
1948 xfrm_msg = msg.len ? msg.buf : NULL;
1949
1950 if (!pgm &&
1951 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1952 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1953 /* a filepair that changes between file and symlink
1954 * needs to be split into deletion and creation.
1955 */
1956 struct diff_filespec *null = alloc_filespec(two->path);
1957 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1958 free(null);
1959 null = alloc_filespec(one->path);
1960 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1961 free(null);
1962 }
1963 else
1964 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1965 complete_rewrite);
1966
1967 strbuf_release(&msg);
1968 }
1969
1970 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1971 struct diffstat_t *diffstat)
1972 {
1973 const char *name;
1974 const char *other;
1975 int complete_rewrite = 0;
1976
1977 if (DIFF_PAIR_UNMERGED(p)) {
1978 /* unmerged */
1979 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1980 return;
1981 }
1982
1983 name = p->one->path;
1984 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1985
1986 diff_fill_sha1_info(p->one);
1987 diff_fill_sha1_info(p->two);
1988
1989 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1990 complete_rewrite = 1;
1991 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1992 }
1993
1994 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1995 {
1996 const char *name;
1997 const char *other;
1998
1999 if (DIFF_PAIR_UNMERGED(p)) {
2000 /* unmerged */
2001 return;
2002 }
2003
2004 name = p->one->path;
2005 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2006
2007 diff_fill_sha1_info(p->one);
2008 diff_fill_sha1_info(p->two);
2009
2010 builtin_checkdiff(name, other, p->one, p->two, o);
2011 }
2012
2013 void diff_setup(struct diff_options *options)
2014 {
2015 memset(options, 0, sizeof(*options));
2016 options->line_termination = '\n';
2017 options->break_opt = -1;
2018 options->rename_limit = -1;
2019 options->context = 3;
2020 options->msg_sep = "";
2021
2022 options->change = diff_change;
2023 options->add_remove = diff_addremove;
2024 if (diff_use_color_default)
2025 DIFF_OPT_SET(options, COLOR_DIFF);
2026 else
2027 DIFF_OPT_CLR(options, COLOR_DIFF);
2028 options->detect_rename = diff_detect_rename_default;
2029
2030 options->a_prefix = "a/";
2031 options->b_prefix = "b/";
2032 }
2033
2034 int diff_setup_done(struct diff_options *options)
2035 {
2036 int count = 0;
2037
2038 if (options->output_format & DIFF_FORMAT_NAME)
2039 count++;
2040 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2041 count++;
2042 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2043 count++;
2044 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2045 count++;
2046 if (count > 1)
2047 die("--name-only, --name-status, --check and -s are mutually exclusive");
2048
2049 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2050 options->detect_rename = DIFF_DETECT_COPY;
2051
2052 if (options->output_format & (DIFF_FORMAT_NAME |
2053 DIFF_FORMAT_NAME_STATUS |
2054 DIFF_FORMAT_CHECKDIFF |
2055 DIFF_FORMAT_NO_OUTPUT))
2056 options->output_format &= ~(DIFF_FORMAT_RAW |
2057 DIFF_FORMAT_NUMSTAT |
2058 DIFF_FORMAT_DIFFSTAT |
2059 DIFF_FORMAT_SHORTSTAT |
2060 DIFF_FORMAT_SUMMARY |
2061 DIFF_FORMAT_PATCH);
2062
2063 /*
2064 * These cases always need recursive; we do not drop caller-supplied
2065 * recursive bits for other formats here.
2066 */
2067 if (options->output_format & (DIFF_FORMAT_PATCH |
2068 DIFF_FORMAT_NUMSTAT |
2069 DIFF_FORMAT_DIFFSTAT |
2070 DIFF_FORMAT_SHORTSTAT |
2071 DIFF_FORMAT_SUMMARY |
2072 DIFF_FORMAT_CHECKDIFF))
2073 DIFF_OPT_SET(options, RECURSIVE);
2074 /*
2075 * Also pickaxe would not work very well if you do not say recursive
2076 */
2077 if (options->pickaxe)
2078 DIFF_OPT_SET(options, RECURSIVE);
2079
2080 if (options->detect_rename && options->rename_limit < 0)
2081 options->rename_limit = diff_rename_limit_default;
2082 if (options->setup & DIFF_SETUP_USE_CACHE) {
2083 if (!active_cache)
2084 /* read-cache does not die even when it fails
2085 * so it is safe for us to do this here. Also
2086 * it does not smudge active_cache or active_nr
2087 * when it fails, so we do not have to worry about
2088 * cleaning it up ourselves either.
2089 */
2090 read_cache();
2091 }
2092 if (options->abbrev <= 0 || 40 < options->abbrev)
2093 options->abbrev = 40; /* full */
2094
2095 /*
2096 * It does not make sense to show the first hit we happened
2097 * to have found. It does not make sense not to return with
2098 * exit code in such a case either.
2099 */
2100 if (DIFF_OPT_TST(options, QUIET)) {
2101 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2102 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2103 }
2104
2105 /*
2106 * If we postprocess in diffcore, we cannot simply return
2107 * upon the first hit. We need to run diff as usual.
2108 */
2109 if (options->pickaxe || options->filter)
2110 DIFF_OPT_CLR(options, QUIET);
2111
2112 return 0;
2113 }
2114
2115 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2116 {
2117 char c, *eq;
2118 int len;
2119
2120 if (*arg != '-')
2121 return 0;
2122 c = *++arg;
2123 if (!c)
2124 return 0;
2125 if (c == arg_short) {
2126 c = *++arg;
2127 if (!c)
2128 return 1;
2129 if (val && isdigit(c)) {
2130 char *end;
2131 int n = strtoul(arg, &end, 10);
2132 if (*end)
2133 return 0;
2134 *val = n;
2135 return 1;
2136 }
2137 return 0;
2138 }
2139 if (c != '-')
2140 return 0;
2141 arg++;
2142 eq = strchr(arg, '=');
2143 if (eq)
2144 len = eq - arg;
2145 else
2146 len = strlen(arg);
2147 if (!len || strncmp(arg, arg_long, len))
2148 return 0;
2149 if (eq) {
2150 int n;
2151 char *end;
2152 if (!isdigit(*++eq))
2153 return 0;
2154 n = strtoul(eq, &end, 10);
2155 if (*end)
2156 return 0;
2157 *val = n;
2158 }
2159 return 1;
2160 }
2161
2162 static int diff_scoreopt_parse(const char *opt);
2163
2164 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2165 {
2166 const char *arg = av[0];
2167
2168 /* Output format options */
2169 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2170 options->output_format |= DIFF_FORMAT_PATCH;
2171 else if (opt_arg(arg, 'U', "unified", &options->context))
2172 options->output_format |= DIFF_FORMAT_PATCH;
2173 else if (!strcmp(arg, "--raw"))
2174 options->output_format |= DIFF_FORMAT_RAW;
2175 else if (!strcmp(arg, "--patch-with-raw"))
2176 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2177 else if (!strcmp(arg, "--numstat"))
2178 options->output_format |= DIFF_FORMAT_NUMSTAT;
2179 else if (!strcmp(arg, "--shortstat"))
2180 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2181 else if (!strcmp(arg, "--check"))
2182 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2183 else if (!strcmp(arg, "--summary"))
2184 options->output_format |= DIFF_FORMAT_SUMMARY;
2185 else if (!strcmp(arg, "--patch-with-stat"))
2186 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2187 else if (!strcmp(arg, "--name-only"))
2188 options->output_format |= DIFF_FORMAT_NAME;
2189 else if (!strcmp(arg, "--name-status"))
2190 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2191 else if (!strcmp(arg, "-s"))
2192 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2193 else if (!prefixcmp(arg, "--stat")) {
2194 char *end;
2195 int width = options->stat_width;
2196 int name_width = options->stat_name_width;
2197 arg += 6;
2198 end = (char *)arg;
2199
2200 switch (*arg) {
2201 case '-':
2202 if (!prefixcmp(arg, "-width="))
2203 width = strtoul(arg + 7, &end, 10);
2204 else if (!prefixcmp(arg, "-name-width="))
2205 name_width = strtoul(arg + 12, &end, 10);
2206 break;
2207 case '=':
2208 width = strtoul(arg+1, &end, 10);
2209 if (*end == ',')
2210 name_width = strtoul(end+1, &end, 10);
2211 }
2212
2213 /* Important! This checks all the error cases! */
2214 if (*end)
2215 return 0;
2216 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2217 options->stat_name_width = name_width;
2218 options->stat_width = width;
2219 }
2220
2221 /* renames options */
2222 else if (!prefixcmp(arg, "-B")) {
2223 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2224 return -1;
2225 }
2226 else if (!prefixcmp(arg, "-M")) {
2227 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2228 return -1;
2229 options->detect_rename = DIFF_DETECT_RENAME;
2230 }
2231 else if (!prefixcmp(arg, "-C")) {
2232 if (options->detect_rename == DIFF_DETECT_COPY)
2233 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2234 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2235 return -1;
2236 options->detect_rename = DIFF_DETECT_COPY;
2237 }
2238 else if (!strcmp(arg, "--no-renames"))
2239 options->detect_rename = 0;
2240
2241 /* xdiff options */
2242 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2243 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2244 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2245 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2246 else if (!strcmp(arg, "--ignore-space-at-eol"))
2247 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2248
2249 /* flags options */
2250 else if (!strcmp(arg, "--binary")) {
2251 options->output_format |= DIFF_FORMAT_PATCH;
2252 DIFF_OPT_SET(options, BINARY);
2253 }
2254 else if (!strcmp(arg, "--full-index"))
2255 DIFF_OPT_SET(options, FULL_INDEX);
2256 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2257 DIFF_OPT_SET(options, TEXT);
2258 else if (!strcmp(arg, "-R"))
2259 DIFF_OPT_SET(options, REVERSE_DIFF);
2260 else if (!strcmp(arg, "--find-copies-harder"))
2261 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2262 else if (!strcmp(arg, "--follow"))
2263 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2264 else if (!strcmp(arg, "--color"))
2265 DIFF_OPT_SET(options, COLOR_DIFF);
2266 else if (!strcmp(arg, "--no-color"))
2267 DIFF_OPT_CLR(options, COLOR_DIFF);
2268 else if (!strcmp(arg, "--color-words"))
2269 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2270 else if (!strcmp(arg, "--exit-code"))
2271 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2272 else if (!strcmp(arg, "--quiet"))
2273 DIFF_OPT_SET(options, QUIET);
2274 else if (!strcmp(arg, "--ext-diff"))
2275 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2276 else if (!strcmp(arg, "--no-ext-diff"))
2277 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2278
2279 /* misc options */
2280 else if (!strcmp(arg, "-z"))
2281 options->line_termination = 0;
2282 else if (!prefixcmp(arg, "-l"))
2283 options->rename_limit = strtoul(arg+2, NULL, 10);
2284 else if (!prefixcmp(arg, "-S"))
2285 options->pickaxe = arg + 2;
2286 else if (!strcmp(arg, "--pickaxe-all"))
2287 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2288 else if (!strcmp(arg, "--pickaxe-regex"))
2289 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2290 else if (!prefixcmp(arg, "-O"))
2291 options->orderfile = arg + 2;
2292 else if (!prefixcmp(arg, "--diff-filter="))
2293 options->filter = arg + 14;
2294 else if (!strcmp(arg, "--abbrev"))
2295 options->abbrev = DEFAULT_ABBREV;
2296 else if (!prefixcmp(arg, "--abbrev=")) {
2297 options->abbrev = strtoul(arg + 9, NULL, 10);
2298 if (options->abbrev < MINIMUM_ABBREV)
2299 options->abbrev = MINIMUM_ABBREV;
2300 else if (40 < options->abbrev)
2301 options->abbrev = 40;
2302 }
2303 else if (!prefixcmp(arg, "--src-prefix="))
2304 options->a_prefix = arg + 13;
2305 else if (!prefixcmp(arg, "--dst-prefix="))
2306 options->b_prefix = arg + 13;
2307 else if (!strcmp(arg, "--no-prefix"))
2308 options->a_prefix = options->b_prefix = "";
2309 else
2310 return 0;
2311 return 1;
2312 }
2313
2314 static int parse_num(const char **cp_p)
2315 {
2316 unsigned long num, scale;
2317 int ch, dot;
2318 const char *cp = *cp_p;
2319
2320 num = 0;
2321 scale = 1;
2322 dot = 0;
2323 for(;;) {
2324 ch = *cp;
2325 if ( !dot && ch == '.' ) {
2326 scale = 1;
2327 dot = 1;
2328 } else if ( ch == '%' ) {
2329 scale = dot ? scale*100 : 100;
2330 cp++; /* % is always at the end */
2331 break;
2332 } else if ( ch >= '0' && ch <= '9' ) {
2333 if ( scale < 100000 ) {
2334 scale *= 10;
2335 num = (num*10) + (ch-'0');
2336 }
2337 } else {
2338 break;
2339 }
2340 cp++;
2341 }
2342 *cp_p = cp;
2343
2344 /* user says num divided by scale and we say internally that
2345 * is MAX_SCORE * num / scale.
2346 */
2347 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2348 }
2349
2350 static int diff_scoreopt_parse(const char *opt)
2351 {
2352 int opt1, opt2, cmd;
2353
2354 if (*opt++ != '-')
2355 return -1;
2356 cmd = *opt++;
2357 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2358 return -1; /* that is not a -M, -C nor -B option */
2359
2360 opt1 = parse_num(&opt);
2361 if (cmd != 'B')
2362 opt2 = 0;
2363 else {
2364 if (*opt == 0)
2365 opt2 = 0;
2366 else if (*opt != '/')
2367 return -1; /* we expect -B80/99 or -B80 */
2368 else {
2369 opt++;
2370 opt2 = parse_num(&opt);
2371 }
2372 }
2373 if (*opt != 0)
2374 return -1;
2375 return opt1 | (opt2 << 16);
2376 }
2377
2378 struct diff_queue_struct diff_queued_diff;
2379
2380 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2381 {
2382 if (queue->alloc <= queue->nr) {
2383 queue->alloc = alloc_nr(queue->alloc);
2384 queue->queue = xrealloc(queue->queue,
2385 sizeof(dp) * queue->alloc);
2386 }
2387 queue->queue[queue->nr++] = dp;
2388 }
2389
2390 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2391 struct diff_filespec *one,
2392 struct diff_filespec *two)
2393 {
2394 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2395 dp->one = one;
2396 dp->two = two;
2397 if (queue)
2398 diff_q(queue, dp);
2399 return dp;
2400 }
2401
2402 void diff_free_filepair(struct diff_filepair *p)
2403 {
2404 free_filespec(p->one);
2405 free_filespec(p->two);
2406 free(p);
2407 }
2408
2409 /* This is different from find_unique_abbrev() in that
2410 * it stuffs the result with dots for alignment.
2411 */
2412 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2413 {
2414 int abblen;
2415 const char *abbrev;
2416 if (len == 40)
2417 return sha1_to_hex(sha1);
2418
2419 abbrev = find_unique_abbrev(sha1, len);
2420 if (!abbrev)
2421 return sha1_to_hex(sha1);
2422 abblen = strlen(abbrev);
2423 if (abblen < 37) {
2424 static char hex[41];
2425 if (len < abblen && abblen <= len + 2)
2426 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2427 else
2428 sprintf(hex, "%s...", abbrev);
2429 return hex;
2430 }
2431 return sha1_to_hex(sha1);
2432 }
2433
2434 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2435 {
2436 int line_termination = opt->line_termination;
2437 int inter_name_termination = line_termination ? '\t' : '\0';
2438
2439 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2440 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2441 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2442 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2443 }
2444 if (p->score) {
2445 printf("%c%03d%c", p->status, similarity_index(p),
2446 inter_name_termination);
2447 } else {
2448 printf("%c%c", p->status, inter_name_termination);
2449 }
2450
2451 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2452 write_name_quoted(p->one->path, stdout, inter_name_termination);
2453 write_name_quoted(p->two->path, stdout, line_termination);
2454 } else {
2455 const char *path = p->one->mode ? p->one->path : p->two->path;
2456 write_name_quoted(path, stdout, line_termination);
2457 }
2458 }
2459
2460 int diff_unmodified_pair(struct diff_filepair *p)
2461 {
2462 /* This function is written stricter than necessary to support
2463 * the currently implemented transformers, but the idea is to
2464 * let transformers to produce diff_filepairs any way they want,
2465 * and filter and clean them up here before producing the output.
2466 */
2467 struct diff_filespec *one = p->one, *two = p->two;
2468
2469 if (DIFF_PAIR_UNMERGED(p))
2470 return 0; /* unmerged is interesting */
2471
2472 /* deletion, addition, mode or type change
2473 * and rename are all interesting.
2474 */
2475 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2476 DIFF_PAIR_MODE_CHANGED(p) ||
2477 strcmp(one->path, two->path))
2478 return 0;
2479
2480 /* both are valid and point at the same path. that is, we are
2481 * dealing with a change.
2482 */
2483 if (one->sha1_valid && two->sha1_valid &&
2484 !hashcmp(one->sha1, two->sha1))
2485 return 1; /* no change */
2486 if (!one->sha1_valid && !two->sha1_valid)
2487 return 1; /* both look at the same file on the filesystem. */
2488 return 0;
2489 }
2490
2491 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2492 {
2493 if (diff_unmodified_pair(p))
2494 return;
2495
2496 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2497 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2498 return; /* no tree diffs in patch format */
2499
2500 run_diff(p, o);
2501 }
2502
2503 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2504 struct diffstat_t *diffstat)
2505 {
2506 if (diff_unmodified_pair(p))
2507 return;
2508
2509 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2510 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2511 return; /* no tree diffs in patch format */
2512
2513 run_diffstat(p, o, diffstat);
2514 }
2515
2516 static void diff_flush_checkdiff(struct diff_filepair *p,
2517 struct diff_options *o)
2518 {
2519 if (diff_unmodified_pair(p))
2520 return;
2521
2522 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2523 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2524 return; /* no tree diffs in patch format */
2525
2526 run_checkdiff(p, o);
2527 }
2528
2529 int diff_queue_is_empty(void)
2530 {
2531 struct diff_queue_struct *q = &diff_queued_diff;
2532 int i;
2533 for (i = 0; i < q->nr; i++)
2534 if (!diff_unmodified_pair(q->queue[i]))
2535 return 0;
2536 return 1;
2537 }
2538
2539 #if DIFF_DEBUG
2540 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2541 {
2542 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2543 x, one ? one : "",
2544 s->path,
2545 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2546 s->mode,
2547 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2548 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2549 x, one ? one : "",
2550 s->size, s->xfrm_flags);
2551 }
2552
2553 void diff_debug_filepair(const struct diff_filepair *p, int i)
2554 {
2555 diff_debug_filespec(p->one, i, "one");
2556 diff_debug_filespec(p->two, i, "two");
2557 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2558 p->score, p->status ? p->status : '?',
2559 p->one->rename_used, p->broken_pair);
2560 }
2561
2562 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2563 {
2564 int i;
2565 if (msg)
2566 fprintf(stderr, "%s\n", msg);
2567 fprintf(stderr, "q->nr = %d\n", q->nr);
2568 for (i = 0; i < q->nr; i++) {
2569 struct diff_filepair *p = q->queue[i];
2570 diff_debug_filepair(p, i);
2571 }
2572 }
2573 #endif
2574
2575 static void diff_resolve_rename_copy(void)
2576 {
2577 int i;
2578 struct diff_filepair *p;
2579 struct diff_queue_struct *q = &diff_queued_diff;
2580
2581 diff_debug_queue("resolve-rename-copy", q);
2582
2583 for (i = 0; i < q->nr; i++) {
2584 p = q->queue[i];
2585 p->status = 0; /* undecided */
2586 if (DIFF_PAIR_UNMERGED(p))
2587 p->status = DIFF_STATUS_UNMERGED;
2588 else if (!DIFF_FILE_VALID(p->one))
2589 p->status = DIFF_STATUS_ADDED;
2590 else if (!DIFF_FILE_VALID(p->two))
2591 p->status = DIFF_STATUS_DELETED;
2592 else if (DIFF_PAIR_TYPE_CHANGED(p))
2593 p->status = DIFF_STATUS_TYPE_CHANGED;
2594
2595 /* from this point on, we are dealing with a pair
2596 * whose both sides are valid and of the same type, i.e.
2597 * either in-place edit or rename/copy edit.
2598 */
2599 else if (DIFF_PAIR_RENAME(p)) {
2600 /*
2601 * A rename might have re-connected a broken
2602 * pair up, causing the pathnames to be the
2603 * same again. If so, that's not a rename at
2604 * all, just a modification..
2605 *
2606 * Otherwise, see if this source was used for
2607 * multiple renames, in which case we decrement
2608 * the count, and call it a copy.
2609 */
2610 if (!strcmp(p->one->path, p->two->path))
2611 p->status = DIFF_STATUS_MODIFIED;
2612 else if (--p->one->rename_used > 0)
2613 p->status = DIFF_STATUS_COPIED;
2614 else
2615 p->status = DIFF_STATUS_RENAMED;
2616 }
2617 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2618 p->one->mode != p->two->mode ||
2619 is_null_sha1(p->one->sha1))
2620 p->status = DIFF_STATUS_MODIFIED;
2621 else {
2622 /* This is a "no-change" entry and should not
2623 * happen anymore, but prepare for broken callers.
2624 */
2625 error("feeding unmodified %s to diffcore",
2626 p->one->path);
2627 p->status = DIFF_STATUS_UNKNOWN;
2628 }
2629 }
2630 diff_debug_queue("resolve-rename-copy done", q);
2631 }
2632
2633 static int check_pair_status(struct diff_filepair *p)
2634 {
2635 switch (p->status) {
2636 case DIFF_STATUS_UNKNOWN:
2637 return 0;
2638 case 0:
2639 die("internal error in diff-resolve-rename-copy");
2640 default:
2641 return 1;
2642 }
2643 }
2644
2645 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2646 {
2647 int fmt = opt->output_format;
2648
2649 if (fmt & DIFF_FORMAT_CHECKDIFF)
2650 diff_flush_checkdiff(p, opt);
2651 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2652 diff_flush_raw(p, opt);
2653 else if (fmt & DIFF_FORMAT_NAME)
2654 write_name_quoted(p->two->path, stdout, opt->line_termination);
2655 }
2656
2657 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2658 {
2659 if (fs->mode)
2660 printf(" %s mode %06o ", newdelete, fs->mode);
2661 else
2662 printf(" %s ", newdelete);
2663 write_name_quoted(fs->path, stdout, '\n');
2664 }
2665
2666
2667 static void show_mode_change(struct diff_filepair *p, int show_name)
2668 {
2669 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2670 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2671 show_name ? ' ' : '\n');
2672 if (show_name) {
2673 write_name_quoted(p->two->path, stdout, '\n');
2674 }
2675 }
2676 }
2677
2678 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2679 {
2680 char *names = pprint_rename(p->one->path, p->two->path);
2681
2682 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2683 free(names);
2684 show_mode_change(p, 0);
2685 }
2686
2687 static void diff_summary(struct diff_filepair *p)
2688 {
2689 switch(p->status) {
2690 case DIFF_STATUS_DELETED:
2691 show_file_mode_name("delete", p->one);
2692 break;
2693 case DIFF_STATUS_ADDED:
2694 show_file_mode_name("create", p->two);
2695 break;
2696 case DIFF_STATUS_COPIED:
2697 show_rename_copy("copy", p);
2698 break;
2699 case DIFF_STATUS_RENAMED:
2700 show_rename_copy("rename", p);
2701 break;
2702 default:
2703 if (p->score) {
2704 fputs(" rewrite ", stdout);
2705 write_name_quoted(p->two->path, stdout, ' ');
2706 printf("(%d%%)\n", similarity_index(p));
2707 }
2708 show_mode_change(p, !p->score);
2709 break;
2710 }
2711 }
2712
2713 struct patch_id_t {
2714 struct xdiff_emit_state xm;
2715 SHA_CTX *ctx;
2716 int patchlen;
2717 };
2718
2719 static int remove_space(char *line, int len)
2720 {
2721 int i;
2722 char *dst = line;
2723 unsigned char c;
2724
2725 for (i = 0; i < len; i++)
2726 if (!isspace((c = line[i])))
2727 *dst++ = c;
2728
2729 return dst - line;
2730 }
2731
2732 static void patch_id_consume(void *priv, char *line, unsigned long len)
2733 {
2734 struct patch_id_t *data = priv;
2735 int new_len;
2736
2737 /* Ignore line numbers when computing the SHA1 of the patch */
2738 if (!prefixcmp(line, "@@ -"))
2739 return;
2740
2741 new_len = remove_space(line, len);
2742
2743 SHA1_Update(data->ctx, line, new_len);
2744 data->patchlen += new_len;
2745 }
2746
2747 /* returns 0 upon success, and writes result into sha1 */
2748 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2749 {
2750 struct diff_queue_struct *q = &diff_queued_diff;
2751 int i;
2752 SHA_CTX ctx;
2753 struct patch_id_t data;
2754 char buffer[PATH_MAX * 4 + 20];
2755
2756 SHA1_Init(&ctx);
2757 memset(&data, 0, sizeof(struct patch_id_t));
2758 data.ctx = &ctx;
2759 data.xm.consume = patch_id_consume;
2760
2761 for (i = 0; i < q->nr; i++) {
2762 xpparam_t xpp;
2763 xdemitconf_t xecfg;
2764 xdemitcb_t ecb;
2765 mmfile_t mf1, mf2;
2766 struct diff_filepair *p = q->queue[i];
2767 int len1, len2;
2768
2769 memset(&xecfg, 0, sizeof(xecfg));
2770 if (p->status == 0)
2771 return error("internal diff status error");
2772 if (p->status == DIFF_STATUS_UNKNOWN)
2773 continue;
2774 if (diff_unmodified_pair(p))
2775 continue;
2776 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2777 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2778 continue;
2779 if (DIFF_PAIR_UNMERGED(p))
2780 continue;
2781
2782 diff_fill_sha1_info(p->one);
2783 diff_fill_sha1_info(p->two);
2784 if (fill_mmfile(&mf1, p->one) < 0 ||
2785 fill_mmfile(&mf2, p->two) < 0)
2786 return error("unable to read files to diff");
2787
2788 len1 = remove_space(p->one->path, strlen(p->one->path));
2789 len2 = remove_space(p->two->path, strlen(p->two->path));
2790 if (p->one->mode == 0)
2791 len1 = snprintf(buffer, sizeof(buffer),
2792 "diff--gita/%.*sb/%.*s"
2793 "newfilemode%06o"
2794 "---/dev/null"
2795 "+++b/%.*s",
2796 len1, p->one->path,
2797 len2, p->two->path,
2798 p->two->mode,
2799 len2, p->two->path);
2800 else if (p->two->mode == 0)
2801 len1 = snprintf(buffer, sizeof(buffer),
2802 "diff--gita/%.*sb/%.*s"
2803 "deletedfilemode%06o"
2804 "---a/%.*s"
2805 "+++/dev/null",
2806 len1, p->one->path,
2807 len2, p->two->path,
2808 p->one->mode,
2809 len1, p->one->path);
2810 else
2811 len1 = snprintf(buffer, sizeof(buffer),
2812 "diff--gita/%.*sb/%.*s"
2813 "---a/%.*s"
2814 "+++b/%.*s",
2815 len1, p->one->path,
2816 len2, p->two->path,
2817 len1, p->one->path,
2818 len2, p->two->path);
2819 SHA1_Update(&ctx, buffer, len1);
2820
2821 xpp.flags = XDF_NEED_MINIMAL;
2822 xecfg.ctxlen = 3;
2823 xecfg.flags = XDL_EMIT_FUNCNAMES;
2824 ecb.outf = xdiff_outf;
2825 ecb.priv = &data;
2826 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2827 }
2828
2829 SHA1_Final(sha1, &ctx);
2830 return 0;
2831 }
2832
2833 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2834 {
2835 struct diff_queue_struct *q = &diff_queued_diff;
2836 int i;
2837 int result = diff_get_patch_id(options, sha1);
2838
2839 for (i = 0; i < q->nr; i++)
2840 diff_free_filepair(q->queue[i]);
2841
2842 free(q->queue);
2843 q->queue = NULL;
2844 q->nr = q->alloc = 0;
2845
2846 return result;
2847 }
2848
2849 static int is_summary_empty(const struct diff_queue_struct *q)
2850 {
2851 int i;
2852
2853 for (i = 0; i < q->nr; i++) {
2854 const struct diff_filepair *p = q->queue[i];
2855
2856 switch (p->status) {
2857 case DIFF_STATUS_DELETED:
2858 case DIFF_STATUS_ADDED:
2859 case DIFF_STATUS_COPIED:
2860 case DIFF_STATUS_RENAMED:
2861 return 0;
2862 default:
2863 if (p->score)
2864 return 0;
2865 if (p->one->mode && p->two->mode &&
2866 p->one->mode != p->two->mode)
2867 return 0;
2868 break;
2869 }
2870 }
2871 return 1;
2872 }
2873
2874 void diff_flush(struct diff_options *options)
2875 {
2876 struct diff_queue_struct *q = &diff_queued_diff;
2877 int i, output_format = options->output_format;
2878 int separator = 0;
2879
2880 /*
2881 * Order: raw, stat, summary, patch
2882 * or: name/name-status/checkdiff (other bits clear)
2883 */
2884 if (!q->nr)
2885 goto free_queue;
2886
2887 if (output_format & (DIFF_FORMAT_RAW |
2888 DIFF_FORMAT_NAME |
2889 DIFF_FORMAT_NAME_STATUS |
2890 DIFF_FORMAT_CHECKDIFF)) {
2891 for (i = 0; i < q->nr; i++) {
2892 struct diff_filepair *p = q->queue[i];
2893 if (check_pair_status(p))
2894 flush_one_pair(p, options);
2895 }
2896 separator++;
2897 }
2898
2899 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2900 struct diffstat_t diffstat;
2901
2902 memset(&diffstat, 0, sizeof(struct diffstat_t));
2903 diffstat.xm.consume = diffstat_consume;
2904 for (i = 0; i < q->nr; i++) {
2905 struct diff_filepair *p = q->queue[i];
2906 if (check_pair_status(p))
2907 diff_flush_stat(p, options, &diffstat);
2908 }
2909 if (output_format & DIFF_FORMAT_NUMSTAT)
2910 show_numstat(&diffstat, options);
2911 if (output_format & DIFF_FORMAT_DIFFSTAT)
2912 show_stats(&diffstat, options);
2913 if (output_format & DIFF_FORMAT_SHORTSTAT)
2914 show_shortstats(&diffstat);
2915 free_diffstat_info(&diffstat);
2916 separator++;
2917 }
2918
2919 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2920 for (i = 0; i < q->nr; i++)
2921 diff_summary(q->queue[i]);
2922 separator++;
2923 }
2924
2925 if (output_format & DIFF_FORMAT_PATCH) {
2926 if (separator) {
2927 if (options->stat_sep) {
2928 /* attach patch instead of inline */
2929 fputs(options->stat_sep, stdout);
2930 } else {
2931 putchar(options->line_termination);
2932 }
2933 }
2934
2935 for (i = 0; i < q->nr; i++) {
2936 struct diff_filepair *p = q->queue[i];
2937 if (check_pair_status(p))
2938 diff_flush_patch(p, options);
2939 }
2940 }
2941
2942 if (output_format & DIFF_FORMAT_CALLBACK)
2943 options->format_callback(q, options, options->format_callback_data);
2944
2945 for (i = 0; i < q->nr; i++)
2946 diff_free_filepair(q->queue[i]);
2947 free_queue:
2948 free(q->queue);
2949 q->queue = NULL;
2950 q->nr = q->alloc = 0;
2951 }
2952
2953 static void diffcore_apply_filter(const char *filter)
2954 {
2955 int i;
2956 struct diff_queue_struct *q = &diff_queued_diff;
2957 struct diff_queue_struct outq;
2958 outq.queue = NULL;
2959 outq.nr = outq.alloc = 0;
2960
2961 if (!filter)
2962 return;
2963
2964 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2965 int found;
2966 for (i = found = 0; !found && i < q->nr; i++) {
2967 struct diff_filepair *p = q->queue[i];
2968 if (((p->status == DIFF_STATUS_MODIFIED) &&
2969 ((p->score &&
2970 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2971 (!p->score &&
2972 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2973 ((p->status != DIFF_STATUS_MODIFIED) &&
2974 strchr(filter, p->status)))
2975 found++;
2976 }
2977 if (found)
2978 return;
2979
2980 /* otherwise we will clear the whole queue
2981 * by copying the empty outq at the end of this
2982 * function, but first clear the current entries
2983 * in the queue.
2984 */
2985 for (i = 0; i < q->nr; i++)
2986 diff_free_filepair(q->queue[i]);
2987 }
2988 else {
2989 /* Only the matching ones */
2990 for (i = 0; i < q->nr; i++) {
2991 struct diff_filepair *p = q->queue[i];
2992
2993 if (((p->status == DIFF_STATUS_MODIFIED) &&
2994 ((p->score &&
2995 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2996 (!p->score &&
2997 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2998 ((p->status != DIFF_STATUS_MODIFIED) &&
2999 strchr(filter, p->status)))
3000 diff_q(&outq, p);
3001 else
3002 diff_free_filepair(p);
3003 }
3004 }
3005 free(q->queue);
3006 *q = outq;
3007 }
3008
3009 /* Check whether two filespecs with the same mode and size are identical */
3010 static int diff_filespec_is_identical(struct diff_filespec *one,
3011 struct diff_filespec *two)
3012 {
3013 if (S_ISGITLINK(one->mode)) {
3014 diff_fill_sha1_info(one);
3015 diff_fill_sha1_info(two);
3016 return !hashcmp(one->sha1, two->sha1);
3017 }
3018 if (diff_populate_filespec(one, 0))
3019 return 0;
3020 if (diff_populate_filespec(two, 0))
3021 return 0;
3022 return !memcmp(one->data, two->data, one->size);
3023 }
3024
3025 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3026 {
3027 int i;
3028 struct diff_queue_struct *q = &diff_queued_diff;
3029 struct diff_queue_struct outq;
3030 outq.queue = NULL;
3031 outq.nr = outq.alloc = 0;
3032
3033 for (i = 0; i < q->nr; i++) {
3034 struct diff_filepair *p = q->queue[i];
3035
3036 /*
3037 * 1. Entries that come from stat info dirtyness
3038 * always have both sides (iow, not create/delete),
3039 * one side of the object name is unknown, with
3040 * the same mode and size. Keep the ones that
3041 * do not match these criteria. They have real
3042 * differences.
3043 *
3044 * 2. At this point, the file is known to be modified,
3045 * with the same mode and size, and the object
3046 * name of one side is unknown. Need to inspect
3047 * the identical contents.
3048 */
3049 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3050 !DIFF_FILE_VALID(p->two) ||
3051 (p->one->sha1_valid && p->two->sha1_valid) ||
3052 (p->one->mode != p->two->mode) ||
3053 diff_populate_filespec(p->one, 1) ||
3054 diff_populate_filespec(p->two, 1) ||
3055 (p->one->size != p->two->size) ||
3056 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3057 diff_q(&outq, p);
3058 else {
3059 /*
3060 * The caller can subtract 1 from skip_stat_unmatch
3061 * to determine how many paths were dirty only
3062 * due to stat info mismatch.
3063 */
3064 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3065 diffopt->skip_stat_unmatch++;
3066 diff_free_filepair(p);
3067 }
3068 }
3069 free(q->queue);
3070 *q = outq;
3071 }
3072
3073 void diffcore_std(struct diff_options *options)
3074 {
3075 if (DIFF_OPT_TST(options, QUIET))
3076 return;
3077
3078 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3079 diffcore_skip_stat_unmatch(options);
3080 if (options->break_opt != -1)
3081 diffcore_break(options->break_opt);
3082 if (options->detect_rename)
3083 diffcore_rename(options);
3084 if (options->break_opt != -1)
3085 diffcore_merge_broken();
3086 if (options->pickaxe)
3087 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3088 if (options->orderfile)
3089 diffcore_order(options->orderfile);
3090 diff_resolve_rename_copy();
3091 diffcore_apply_filter(options->filter);
3092
3093 if (diff_queued_diff.nr)
3094 DIFF_OPT_SET(options, HAS_CHANGES);
3095 else
3096 DIFF_OPT_CLR(options, HAS_CHANGES);
3097 }
3098
3099 int diff_result_code(struct diff_options *opt, int status)
3100 {
3101 int result = 0;
3102 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3103 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3104 return status;
3105 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3106 DIFF_OPT_TST(opt, HAS_CHANGES))
3107 result |= 01;
3108 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3109 DIFF_OPT_TST(opt, CHECK_FAILED))
3110 result |= 02;
3111 return result;
3112 }
3113
3114 void diff_addremove(struct diff_options *options,
3115 int addremove, unsigned mode,
3116 const unsigned char *sha1,
3117 const char *base, const char *path)
3118 {
3119 char concatpath[PATH_MAX];
3120 struct diff_filespec *one, *two;
3121
3122 /* This may look odd, but it is a preparation for
3123 * feeding "there are unchanged files which should
3124 * not produce diffs, but when you are doing copy
3125 * detection you would need them, so here they are"
3126 * entries to the diff-core. They will be prefixed
3127 * with something like '=' or '*' (I haven't decided
3128 * which but should not make any difference).
3129 * Feeding the same new and old to diff_change()
3130 * also has the same effect.
3131 * Before the final output happens, they are pruned after
3132 * merged into rename/copy pairs as appropriate.
3133 */
3134 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3135 addremove = (addremove == '+' ? '-' :
3136 addremove == '-' ? '+' : addremove);
3137
3138 if (!path) path = "";
3139 sprintf(concatpath, "%s%s", base, path);
3140 one = alloc_filespec(concatpath);
3141 two = alloc_filespec(concatpath);
3142
3143 if (addremove != '+')
3144 fill_filespec(one, sha1, mode);
3145 if (addremove != '-')
3146 fill_filespec(two, sha1, mode);
3147
3148 diff_queue(&diff_queued_diff, one, two);
3149 DIFF_OPT_SET(options, HAS_CHANGES);
3150 }
3151
3152 void diff_change(struct diff_options *options,
3153 unsigned old_mode, unsigned new_mode,
3154 const unsigned char *old_sha1,
3155 const unsigned char *new_sha1,
3156 const char *base, const char *path)
3157 {
3158 char concatpath[PATH_MAX];
3159 struct diff_filespec *one, *two;
3160
3161 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3162 unsigned tmp;
3163 const unsigned char *tmp_c;
3164 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3165 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3166 }
3167 if (!path) path = "";
3168 sprintf(concatpath, "%s%s", base, path);
3169 one = alloc_filespec(concatpath);
3170 two = alloc_filespec(concatpath);
3171 fill_filespec(one, old_sha1, old_mode);
3172 fill_filespec(two, new_sha1, new_mode);
3173
3174 diff_queue(&diff_queued_diff, one, two);
3175 DIFF_OPT_SET(options, HAS_CHANGES);
3176 }
3177
3178 void diff_unmerge(struct diff_options *options,
3179 const char *path,
3180 unsigned mode, const unsigned char *sha1)
3181 {
3182 struct diff_filespec *one, *two;
3183 one = alloc_filespec(path);
3184 two = alloc_filespec(path);
3185 fill_filespec(one, sha1, mode);
3186 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3187 }
Jonathan Nieder’s miscellaneous git branches