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git-gui: actually show the choose repository dialog
[git/mingw/4msysgit/wingit-dll.git] / diff.c
blob1a45cc00c6d10b578a544d9174fba24e57ca81f4
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 "spawn-pipe.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 = -1;
22 static int diff_use_color_default;
23 int diff_auto_refresh_index = 1;
24
25 static char diff_colors[][COLOR_MAXLEN] = {
26 "\033[m", /* reset */
27 "", /* PLAIN (normal) */
28 "\033[1m", /* METAINFO (bold) */
29 "\033[36m", /* FRAGINFO (cyan) */
30 "\033[31m", /* OLD (red) */
31 "\033[32m", /* NEW (green) */
32 "\033[33m", /* COMMIT (yellow) */
33 "\033[41m", /* WHITESPACE (red background) */
34 };
35
36 static int parse_diff_color_slot(const char *var, int ofs)
37 {
38 if (!strcasecmp(var+ofs, "plain"))
39 return DIFF_PLAIN;
40 if (!strcasecmp(var+ofs, "meta"))
41 return DIFF_METAINFO;
42 if (!strcasecmp(var+ofs, "frag"))
43 return DIFF_FRAGINFO;
44 if (!strcasecmp(var+ofs, "old"))
45 return DIFF_FILE_OLD;
46 if (!strcasecmp(var+ofs, "new"))
47 return DIFF_FILE_NEW;
48 if (!strcasecmp(var+ofs, "commit"))
49 return DIFF_COMMIT;
50 if (!strcasecmp(var+ofs, "whitespace"))
51 return DIFF_WHITESPACE;
52 die("bad config variable '%s'", var);
53 }
54
55 static struct ll_diff_driver {
56 const char *name;
57 struct ll_diff_driver *next;
58 char *cmd;
59 } *user_diff, **user_diff_tail;
60
61 static void read_config_if_needed(void)
62 {
63 if (!user_diff_tail) {
64 user_diff_tail = &user_diff;
65 git_config(git_diff_ui_config);
66 }
67 }
68
69 /*
70 * Currently there is only "diff.<drivername>.command" variable;
71 * because there are "diff.color.<slot>" variables, we are parsing
72 * this in a bit convoluted way to allow low level diff driver
73 * called "color".
74 */
75 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
76 {
77 const char *name;
78 int namelen;
79 struct ll_diff_driver *drv;
80
81 name = var + 5;
82 namelen = ep - name;
83 for (drv = user_diff; drv; drv = drv->next)
84 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
85 break;
86 if (!drv) {
87 char *namebuf;
88 drv = xcalloc(1, sizeof(struct ll_diff_driver));
89 namebuf = xmalloc(namelen + 1);
90 memcpy(namebuf, name, namelen);
91 namebuf[namelen] = 0;
92 drv->name = namebuf;
93 drv->next = NULL;
94 if (!user_diff_tail)
95 user_diff_tail = &user_diff;
96 *user_diff_tail = drv;
97 user_diff_tail = &(drv->next);
98 }
99
100 if (!value)
101 return error("%s: lacks value", var);
102 drv->cmd = strdup(value);
103 return 0;
104 }
105
106 /*
107 * 'diff.<what>.funcname' attribute can be specified in the configuration
108 * to define a customized regexp to find the beginning of a function to
109 * be used for hunk header lines of "diff -p" style output.
110 */
111 static struct funcname_pattern {
112 char *name;
113 char *pattern;
114 struct funcname_pattern *next;
115 } *funcname_pattern_list;
116
117 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
118 {
119 const char *name;
120 int namelen;
121 struct funcname_pattern *pp;
122
123 name = var + 5; /* "diff." */
124 namelen = ep - name;
125
126 for (pp = funcname_pattern_list; pp; pp = pp->next)
127 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
128 break;
129 if (!pp) {
130 char *namebuf;
131 pp = xcalloc(1, sizeof(*pp));
132 namebuf = xmalloc(namelen + 1);
133 memcpy(namebuf, name, namelen);
134 namebuf[namelen] = 0;
135 pp->name = namebuf;
136 pp->next = funcname_pattern_list;
137 funcname_pattern_list = pp;
138 }
139 if (pp->pattern)
140 free(pp->pattern);
141 pp->pattern = xstrdup(value);
142 return 0;
143 }
144
145 /*
146 * These are to give UI layer defaults.
147 * The core-level commands such as git-diff-files should
148 * never be affected by the setting of diff.renames
149 * the user happens to have in the configuration file.
150 */
151 int git_diff_ui_config(const char *var, const char *value)
152 {
153 if (!strcmp(var, "diff.renamelimit")) {
154 diff_rename_limit_default = git_config_int(var, value);
155 return 0;
156 }
157 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
158 diff_use_color_default = git_config_colorbool(var, value);
159 return 0;
160 }
161 if (!strcmp(var, "diff.renames")) {
162 if (!value)
163 diff_detect_rename_default = DIFF_DETECT_RENAME;
164 else if (!strcasecmp(value, "copies") ||
165 !strcasecmp(value, "copy"))
166 diff_detect_rename_default = DIFF_DETECT_COPY;
167 else if (git_config_bool(var,value))
168 diff_detect_rename_default = DIFF_DETECT_RENAME;
169 return 0;
170 }
171 if (!strcmp(var, "diff.autorefreshindex")) {
172 diff_auto_refresh_index = git_config_bool(var, value);
173 return 0;
174 }
175 if (!prefixcmp(var, "diff.")) {
176 const char *ep = strrchr(var, '.');
177
178 if (ep != var + 4) {
179 if (!strcmp(ep, ".command"))
180 return parse_lldiff_command(var, ep, value);
181 if (!strcmp(ep, ".funcname"))
182 return parse_funcname_pattern(var, ep, value);
183 }
184 }
185 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
186 int slot = parse_diff_color_slot(var, 11);
187 color_parse(value, var, diff_colors[slot]);
188 return 0;
189 }
190
191 return git_default_config(var, value);
192 }
193
194 static char *quote_one(const char *str)
195 {
196 int needlen;
197 char *xp;
198
199 if (!str)
200 return NULL;
201 needlen = quote_c_style(str, NULL, NULL, 0);
202 if (!needlen)
203 return xstrdup(str);
204 xp = xmalloc(needlen + 1);
205 quote_c_style(str, xp, NULL, 0);
206 return xp;
207 }
208
209 static char *quote_two(const char *one, const char *two)
210 {
211 int need_one = quote_c_style(one, NULL, NULL, 1);
212 int need_two = quote_c_style(two, NULL, NULL, 1);
213 char *xp;
214
215 if (need_one + need_two) {
216 if (!need_one) need_one = strlen(one);
217 if (!need_two) need_one = strlen(two);
218
219 xp = xmalloc(need_one + need_two + 3);
220 xp[0] = '"';
221 quote_c_style(one, xp + 1, NULL, 1);
222 quote_c_style(two, xp + need_one + 1, NULL, 1);
223 strcpy(xp + need_one + need_two + 1, "\"");
224 return xp;
225 }
226 need_one = strlen(one);
227 need_two = strlen(two);
228 xp = xmalloc(need_one + need_two + 1);
229 strcpy(xp, one);
230 strcpy(xp + need_one, two);
231 return xp;
232 }
233
234 static const char *external_diff(void)
235 {
236 static const char *external_diff_cmd = NULL;
237 static int done_preparing = 0;
238
239 if (done_preparing)
240 return external_diff_cmd;
241 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
242 done_preparing = 1;
243 return external_diff_cmd;
244 }
245
246 static struct diff_tempfile {
247 const char *name; /* filename external diff should read from */
248 char hex[41];
249 char mode[10];
250 char tmp_path[PATH_MAX];
251 } diff_temp[2];
252
253 static int count_lines(const char *data, int size)
254 {
255 int count, ch, completely_empty = 1, nl_just_seen = 0;
256 count = 0;
257 while (0 < size--) {
258 ch = *data++;
259 if (ch == '\n') {
260 count++;
261 nl_just_seen = 1;
262 completely_empty = 0;
263 }
264 else {
265 nl_just_seen = 0;
266 completely_empty = 0;
267 }
268 }
269 if (completely_empty)
270 return 0;
271 if (!nl_just_seen)
272 count++; /* no trailing newline */
273 return count;
274 }
275
276 static void print_line_count(int count)
277 {
278 switch (count) {
279 case 0:
280 printf("0,0");
281 break;
282 case 1:
283 printf("1");
284 break;
285 default:
286 printf("1,%d", count);
287 break;
288 }
289 }
290
291 static void copy_file(int prefix, const char *data, int size,
292 const char *set, const char *reset)
293 {
294 int ch, nl_just_seen = 1;
295 while (0 < size--) {
296 ch = *data++;
297 if (nl_just_seen) {
298 fputs(set, stdout);
299 putchar(prefix);
300 }
301 if (ch == '\n') {
302 nl_just_seen = 1;
303 fputs(reset, stdout);
304 } else
305 nl_just_seen = 0;
306 putchar(ch);
307 }
308 if (!nl_just_seen)
309 printf("%s\n\\ No newline at end of file\n", reset);
310 }
311
312 static void emit_rewrite_diff(const char *name_a,
313 const char *name_b,
314 struct diff_filespec *one,
315 struct diff_filespec *two,
316 int color_diff)
317 {
318 int lc_a, lc_b;
319 const char *name_a_tab, *name_b_tab;
320 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
321 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
322 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
323 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
324 const char *reset = diff_get_color(color_diff, DIFF_RESET);
325
326 name_a += (*name_a == '/');
327 name_b += (*name_b == '/');
328 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
329 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
330
331 diff_populate_filespec(one, 0);
332 diff_populate_filespec(two, 0);
333 lc_a = count_lines(one->data, one->size);
334 lc_b = count_lines(two->data, two->size);
335 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
336 metainfo, name_a, name_a_tab, reset,
337 metainfo, name_b, name_b_tab, reset, fraginfo);
338 print_line_count(lc_a);
339 printf(" +");
340 print_line_count(lc_b);
341 printf(" @@%s\n", reset);
342 if (lc_a)
343 copy_file('-', one->data, one->size, old, reset);
344 if (lc_b)
345 copy_file('+', two->data, two->size, new, reset);
346 }
347
348 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
349 {
350 if (!DIFF_FILE_VALID(one)) {
351 mf->ptr = (char *)""; /* does not matter */
352 mf->size = 0;
353 return 0;
354 }
355 else if (diff_populate_filespec(one, 0))
356 return -1;
357 mf->ptr = one->data;
358 mf->size = one->size;
359 return 0;
360 }
361
362 struct diff_words_buffer {
363 mmfile_t text;
364 long alloc;
365 long current; /* output pointer */
366 int suppressed_newline;
367 };
368
369 static void diff_words_append(char *line, unsigned long len,
370 struct diff_words_buffer *buffer)
371 {
372 if (buffer->text.size + len > buffer->alloc) {
373 buffer->alloc = (buffer->text.size + len) * 3 / 2;
374 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
375 }
376 line++;
377 len--;
378 memcpy(buffer->text.ptr + buffer->text.size, line, len);
379 buffer->text.size += len;
380 }
381
382 struct diff_words_data {
383 struct xdiff_emit_state xm;
384 struct diff_words_buffer minus, plus;
385 };
386
387 static void print_word(struct diff_words_buffer *buffer, int len, int color,
388 int suppress_newline)
389 {
390 const char *ptr;
391 int eol = 0;
392
393 if (len == 0)
394 return;
395
396 ptr = buffer->text.ptr + buffer->current;
397 buffer->current += len;
398
399 if (ptr[len - 1] == '\n') {
400 eol = 1;
401 len--;
402 }
403
404 fputs(diff_get_color(1, color), stdout);
405 fwrite(ptr, len, 1, stdout);
406 fputs(diff_get_color(1, DIFF_RESET), stdout);
407
408 if (eol) {
409 if (suppress_newline)
410 buffer->suppressed_newline = 1;
411 else
412 putchar('\n');
413 }
414 }
415
416 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
417 {
418 struct diff_words_data *diff_words = priv;
419
420 if (diff_words->minus.suppressed_newline) {
421 if (line[0] != '+')
422 putchar('\n');
423 diff_words->minus.suppressed_newline = 0;
424 }
425
426 len--;
427 switch (line[0]) {
428 case '-':
429 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
430 break;
431 case '+':
432 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
433 break;
434 case ' ':
435 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
436 diff_words->minus.current += len;
437 break;
438 }
439 }
440
441 /* this executes the word diff on the accumulated buffers */
442 static void diff_words_show(struct diff_words_data *diff_words)
443 {
444 xpparam_t xpp;
445 xdemitconf_t xecfg;
446 xdemitcb_t ecb;
447 mmfile_t minus, plus;
448 int i;
449
450 memset(&xecfg, 0, sizeof(xecfg));
451 minus.size = diff_words->minus.text.size;
452 minus.ptr = xmalloc(minus.size);
453 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
454 for (i = 0; i < minus.size; i++)
455 if (isspace(minus.ptr[i]))
456 minus.ptr[i] = '\n';
457 diff_words->minus.current = 0;
458
459 plus.size = diff_words->plus.text.size;
460 plus.ptr = xmalloc(plus.size);
461 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
462 for (i = 0; i < plus.size; i++)
463 if (isspace(plus.ptr[i]))
464 plus.ptr[i] = '\n';
465 diff_words->plus.current = 0;
466
467 xpp.flags = XDF_NEED_MINIMAL;
468 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
469 ecb.outf = xdiff_outf;
470 ecb.priv = diff_words;
471 diff_words->xm.consume = fn_out_diff_words_aux;
472 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
473
474 free(minus.ptr);
475 free(plus.ptr);
476 diff_words->minus.text.size = diff_words->plus.text.size = 0;
477
478 if (diff_words->minus.suppressed_newline) {
479 putchar('\n');
480 diff_words->minus.suppressed_newline = 0;
481 }
482 }
483
484 struct emit_callback {
485 struct xdiff_emit_state xm;
486 int nparents, color_diff;
487 const char **label_path;
488 struct diff_words_data *diff_words;
489 int *found_changesp;
490 };
491
492 static void free_diff_words_data(struct emit_callback *ecbdata)
493 {
494 if (ecbdata->diff_words) {
495 /* flush buffers */
496 if (ecbdata->diff_words->minus.text.size ||
497 ecbdata->diff_words->plus.text.size)
498 diff_words_show(ecbdata->diff_words);
499
500 if (ecbdata->diff_words->minus.text.ptr)
501 free (ecbdata->diff_words->minus.text.ptr);
502 if (ecbdata->diff_words->plus.text.ptr)
503 free (ecbdata->diff_words->plus.text.ptr);
504 free(ecbdata->diff_words);
505 ecbdata->diff_words = NULL;
506 }
507 }
508
509 const char *diff_get_color(int diff_use_color, enum color_diff ix)
510 {
511 if (diff_use_color)
512 return diff_colors[ix];
513 return "";
514 }
515
516 static void emit_line(const char *set, const char *reset, const char *line, int len)
517 {
518 if (len > 0 && line[len-1] == '\n')
519 len--;
520 fputs(set, stdout);
521 fwrite(line, len, 1, stdout);
522 puts(reset);
523 }
524
525 static void emit_line_with_ws(int nparents,
526 const char *set, const char *reset, const char *ws,
527 const char *line, int len)
528 {
529 int col0 = nparents;
530 int last_tab_in_indent = -1;
531 int last_space_in_indent = -1;
532 int i;
533 int tail = len;
534 int need_highlight_leading_space = 0;
535 /* The line is a newly added line. Does it have funny leading
536 * whitespaces? In indent, SP should never precede a TAB.
537 */
538 for (i = col0; i < len; i++) {
539 if (line[i] == '\t') {
540 last_tab_in_indent = i;
541 if (0 <= last_space_in_indent)
542 need_highlight_leading_space = 1;
543 }
544 else if (line[i] == ' ')
545 last_space_in_indent = i;
546 else
547 break;
548 }
549 fputs(set, stdout);
550 fwrite(line, col0, 1, stdout);
551 fputs(reset, stdout);
552 if (((i == len) || line[i] == '\n') && i != col0) {
553 /* The whole line was indent */
554 emit_line(ws, reset, line + col0, len - col0);
555 return;
556 }
557 i = col0;
558 if (need_highlight_leading_space) {
559 while (i < last_tab_in_indent) {
560 if (line[i] == ' ') {
561 fputs(ws, stdout);
562 putchar(' ');
563 fputs(reset, stdout);
564 }
565 else
566 putchar(line[i]);
567 i++;
568 }
569 }
570 tail = len - 1;
571 if (line[tail] == '\n' && i < tail)
572 tail--;
573 while (i < tail) {
574 if (!isspace(line[tail]))
575 break;
576 tail--;
577 }
578 if ((i < tail && line[tail + 1] != '\n')) {
579 /* This has whitespace between tail+1..len */
580 fputs(set, stdout);
581 fwrite(line + i, tail - i + 1, 1, stdout);
582 fputs(reset, stdout);
583 emit_line(ws, reset, line + tail + 1, len - tail - 1);
584 }
585 else
586 emit_line(set, reset, line + i, len - i);
587 }
588
589 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
590 {
591 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
592 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
593
594 if (!*ws)
595 emit_line(set, reset, line, len);
596 else
597 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
598 line, len);
599 }
600
601 static void fn_out_consume(void *priv, char *line, unsigned long len)
602 {
603 int i;
604 int color;
605 struct emit_callback *ecbdata = priv;
606 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
607 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
608
609 *(ecbdata->found_changesp) = 1;
610
611 if (ecbdata->label_path[0]) {
612 const char *name_a_tab, *name_b_tab;
613
614 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
615 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
616
617 printf("%s--- %s%s%s\n",
618 set, ecbdata->label_path[0], reset, name_a_tab);
619 printf("%s+++ %s%s%s\n",
620 set, ecbdata->label_path[1], reset, name_b_tab);
621 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
622 }
623
624 /* This is not really necessary for now because
625 * this codepath only deals with two-way diffs.
626 */
627 for (i = 0; i < len && line[i] == '@'; i++)
628 ;
629 if (2 <= i && i < len && line[i] == ' ') {
630 ecbdata->nparents = i - 1;
631 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
632 reset, line, len);
633 return;
634 }
635
636 if (len < ecbdata->nparents) {
637 set = reset;
638 emit_line(reset, reset, line, len);
639 return;
640 }
641
642 color = DIFF_PLAIN;
643 if (ecbdata->diff_words && ecbdata->nparents != 1)
644 /* fall back to normal diff */
645 free_diff_words_data(ecbdata);
646 if (ecbdata->diff_words) {
647 if (line[0] == '-') {
648 diff_words_append(line, len,
649 &ecbdata->diff_words->minus);
650 return;
651 } else if (line[0] == '+') {
652 diff_words_append(line, len,
653 &ecbdata->diff_words->plus);
654 return;
655 }
656 if (ecbdata->diff_words->minus.text.size ||
657 ecbdata->diff_words->plus.text.size)
658 diff_words_show(ecbdata->diff_words);
659 line++;
660 len--;
661 emit_line(set, reset, line, len);
662 return;
663 }
664 for (i = 0; i < ecbdata->nparents && len; i++) {
665 if (line[i] == '-')
666 color = DIFF_FILE_OLD;
667 else if (line[i] == '+')
668 color = DIFF_FILE_NEW;
669 }
670
671 if (color != DIFF_FILE_NEW) {
672 emit_line(diff_get_color(ecbdata->color_diff, color),
673 reset, line, len);
674 return;
675 }
676 emit_add_line(reset, ecbdata, line, len);
677 }
678
679 static char *pprint_rename(const char *a, const char *b)
680 {
681 const char *old = a;
682 const char *new = b;
683 char *name = NULL;
684 int pfx_length, sfx_length;
685 int len_a = strlen(a);
686 int len_b = strlen(b);
687 int qlen_a = quote_c_style(a, NULL, NULL, 0);
688 int qlen_b = quote_c_style(b, NULL, NULL, 0);
689
690 if (qlen_a || qlen_b) {
691 if (qlen_a) len_a = qlen_a;
692 if (qlen_b) len_b = qlen_b;
693 name = xmalloc( len_a + len_b + 5 );
694 if (qlen_a)
695 quote_c_style(a, name, NULL, 0);
696 else
697 memcpy(name, a, len_a);
698 memcpy(name + len_a, " => ", 4);
699 if (qlen_b)
700 quote_c_style(b, name + len_a + 4, NULL, 0);
701 else
702 memcpy(name + len_a + 4, b, len_b + 1);
703 return name;
704 }
705
706 /* Find common prefix */
707 pfx_length = 0;
708 while (*old && *new && *old == *new) {
709 if (*old == '/')
710 pfx_length = old - a + 1;
711 old++;
712 new++;
713 }
714
715 /* Find common suffix */
716 old = a + len_a;
717 new = b + len_b;
718 sfx_length = 0;
719 while (a <= old && b <= new && *old == *new) {
720 if (*old == '/')
721 sfx_length = len_a - (old - a);
722 old--;
723 new--;
724 }
725
726 /*
727 * pfx{mid-a => mid-b}sfx
728 * {pfx-a => pfx-b}sfx
729 * pfx{sfx-a => sfx-b}
730 * name-a => name-b
731 */
732 if (pfx_length + sfx_length) {
733 int a_midlen = len_a - pfx_length - sfx_length;
734 int b_midlen = len_b - pfx_length - sfx_length;
735 if (a_midlen < 0) a_midlen = 0;
736 if (b_midlen < 0) b_midlen = 0;
737
738 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
739 sprintf(name, "%.*s{%.*s => %.*s}%s",
740 pfx_length, a,
741 a_midlen, a + pfx_length,
742 b_midlen, b + pfx_length,
743 a + len_a - sfx_length);
744 }
745 else {
746 name = xmalloc(len_a + len_b + 5);
747 sprintf(name, "%s => %s", a, b);
748 }
749 return name;
750 }
751
752 struct diffstat_t {
753 struct xdiff_emit_state xm;
754
755 int nr;
756 int alloc;
757 struct diffstat_file {
758 char *name;
759 unsigned is_unmerged:1;
760 unsigned is_binary:1;
761 unsigned is_renamed:1;
762 unsigned int added, deleted;
763 } **files;
764 };
765
766 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
767 const char *name_a,
768 const char *name_b)
769 {
770 struct diffstat_file *x;
771 x = xcalloc(sizeof (*x), 1);
772 if (diffstat->nr == diffstat->alloc) {
773 diffstat->alloc = alloc_nr(diffstat->alloc);
774 diffstat->files = xrealloc(diffstat->files,
775 diffstat->alloc * sizeof(x));
776 }
777 diffstat->files[diffstat->nr++] = x;
778 if (name_b) {
779 x->name = pprint_rename(name_a, name_b);
780 x->is_renamed = 1;
781 }
782 else
783 x->name = xstrdup(name_a);
784 return x;
785 }
786
787 static void diffstat_consume(void *priv, char *line, unsigned long len)
788 {
789 struct diffstat_t *diffstat = priv;
790 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
791
792 if (line[0] == '+')
793 x->added++;
794 else if (line[0] == '-')
795 x->deleted++;
796 }
797
798 const char mime_boundary_leader[] = "------------";
799
800 static int scale_linear(int it, int width, int max_change)
801 {
802 /*
803 * make sure that at least one '-' is printed if there were deletions,
804 * and likewise for '+'.
805 */
806 if (max_change < 2)
807 return it;
808 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
809 }
810
811 static void show_name(const char *prefix, const char *name, int len,
812 const char *reset, const char *set)
813 {
814 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
815 }
816
817 static void show_graph(char ch, int cnt, const char *set, const char *reset)
818 {
819 if (cnt <= 0)
820 return;
821 printf("%s", set);
822 while (cnt--)
823 putchar(ch);
824 printf("%s", reset);
825 }
826
827 static void show_stats(struct diffstat_t* data, struct diff_options *options)
828 {
829 int i, len, add, del, total, adds = 0, dels = 0;
830 int max_change = 0, max_len = 0;
831 int total_files = data->nr;
832 int width, name_width;
833 const char *reset, *set, *add_c, *del_c;
834
835 if (data->nr == 0)
836 return;
837
838 width = options->stat_width ? options->stat_width : 80;
839 name_width = options->stat_name_width ? options->stat_name_width : 50;
840
841 /* Sanity: give at least 5 columns to the graph,
842 * but leave at least 10 columns for the name.
843 */
844 if (width < name_width + 15) {
845 if (name_width <= 25)
846 width = name_width + 15;
847 else
848 name_width = width - 15;
849 }
850
851 /* Find the longest filename and max number of changes */
852 reset = diff_get_color(options->color_diff, DIFF_RESET);
853 set = diff_get_color(options->color_diff, DIFF_PLAIN);
854 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
855 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
856
857 for (i = 0; i < data->nr; i++) {
858 struct diffstat_file *file = data->files[i];
859 int change = file->added + file->deleted;
860
861 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
862 len = quote_c_style(file->name, NULL, NULL, 0);
863 if (len) {
864 char *qname = xmalloc(len + 1);
865 quote_c_style(file->name, qname, NULL, 0);
866 free(file->name);
867 file->name = qname;
868 }
869 }
870
871 len = strlen(file->name);
872 if (max_len < len)
873 max_len = len;
874
875 if (file->is_binary || file->is_unmerged)
876 continue;
877 if (max_change < change)
878 max_change = change;
879 }
880
881 /* Compute the width of the graph part;
882 * 10 is for one blank at the beginning of the line plus
883 * " | count " between the name and the graph.
884 *
885 * From here on, name_width is the width of the name area,
886 * and width is the width of the graph area.
887 */
888 name_width = (name_width < max_len) ? name_width : max_len;
889 if (width < (name_width + 10) + max_change)
890 width = width - (name_width + 10);
891 else
892 width = max_change;
893
894 for (i = 0; i < data->nr; i++) {
895 const char *prefix = "";
896 char *name = data->files[i]->name;
897 int added = data->files[i]->added;
898 int deleted = data->files[i]->deleted;
899 int name_len;
900
901 /*
902 * "scale" the filename
903 */
904 len = name_width;
905 name_len = strlen(name);
906 if (name_width < name_len) {
907 char *slash;
908 prefix = "...";
909 len -= 3;
910 name += name_len - len;
911 slash = strchr(name, '/');
912 if (slash)
913 name = slash;
914 }
915
916 if (data->files[i]->is_binary) {
917 show_name(prefix, name, len, reset, set);
918 printf(" Bin ");
919 printf("%s%d%s", del_c, deleted, reset);
920 printf(" -> ");
921 printf("%s%d%s", add_c, added, reset);
922 printf(" bytes");
923 printf("\n");
924 goto free_diffstat_file;
925 }
926 else if (data->files[i]->is_unmerged) {
927 show_name(prefix, name, len, reset, set);
928 printf(" Unmerged\n");
929 goto free_diffstat_file;
930 }
931 else if (!data->files[i]->is_renamed &&
932 (added + deleted == 0)) {
933 total_files--;
934 goto free_diffstat_file;
935 }
936
937 /*
938 * scale the add/delete
939 */
940 add = added;
941 del = deleted;
942 total = add + del;
943 adds += add;
944 dels += del;
945
946 if (width <= max_change) {
947 add = scale_linear(add, width, max_change);
948 del = scale_linear(del, width, max_change);
949 total = add + del;
950 }
951 show_name(prefix, name, len, reset, set);
952 printf("%5d ", added + deleted);
953 show_graph('+', add, add_c, reset);
954 show_graph('-', del, del_c, reset);
955 putchar('\n');
956 free_diffstat_file:
957 free(data->files[i]->name);
958 free(data->files[i]);
959 }
960 free(data->files);
961 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
962 set, total_files, adds, dels, reset);
963 }
964
965 static void show_shortstats(struct diffstat_t* data)
966 {
967 int i, adds = 0, dels = 0, total_files = data->nr;
968
969 if (data->nr == 0)
970 return;
971
972 for (i = 0; i < data->nr; i++) {
973 if (!data->files[i]->is_binary &&
974 !data->files[i]->is_unmerged) {
975 int added = data->files[i]->added;
976 int deleted= data->files[i]->deleted;
977 if (!data->files[i]->is_renamed &&
978 (added + deleted == 0)) {
979 total_files--;
980 } else {
981 adds += added;
982 dels += deleted;
983 }
984 }
985 free(data->files[i]->name);
986 free(data->files[i]);
987 }
988 free(data->files);
989
990 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
991 total_files, adds, dels);
992 }
993
994 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
995 {
996 int i;
997
998 for (i = 0; i < data->nr; i++) {
999 struct diffstat_file *file = data->files[i];
1000
1001 if (file->is_binary)
1002 printf("-\t-\t");
1003 else
1004 printf("%d\t%d\t", file->added, file->deleted);
1005 if (options->line_termination && !file->is_renamed &&
1006 quote_c_style(file->name, NULL, NULL, 0))
1007 quote_c_style(file->name, NULL, stdout, 0);
1008 else
1009 fputs(file->name, stdout);
1010 putchar(options->line_termination);
1011 }
1012 }
1013
1014 struct checkdiff_t {
1015 struct xdiff_emit_state xm;
1016 const char *filename;
1017 int lineno, color_diff;
1018 };
1019
1020 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1021 {
1022 struct checkdiff_t *data = priv;
1023 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1024 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1025 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
1026
1027 if (line[0] == '+') {
1028 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
1029
1030 /* check space before tab */
1031 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
1032 if (line[i] == ' ')
1033 spaces++;
1034 if (line[i - 1] == '\t' && spaces)
1035 space_before_tab = 1;
1036
1037 /* check white space at line end */
1038 if (line[len - 1] == '\n')
1039 len--;
1040 if (isspace(line[len - 1]))
1041 white_space_at_end = 1;
1042
1043 if (space_before_tab || white_space_at_end) {
1044 printf("%s:%d: %s", data->filename, data->lineno, ws);
1045 if (space_before_tab) {
1046 printf("space before tab");
1047 if (white_space_at_end)
1048 putchar(',');
1049 }
1050 if (white_space_at_end)
1051 printf("white space at end");
1052 printf(":%s ", reset);
1053 emit_line_with_ws(1, set, reset, ws, line, len);
1054 }
1055
1056 data->lineno++;
1057 } else if (line[0] == ' ')
1058 data->lineno++;
1059 else if (line[0] == '@') {
1060 char *plus = strchr(line, '+');
1061 if (plus)
1062 data->lineno = strtol(plus, NULL, 10);
1063 else
1064 die("invalid diff");
1065 }
1066 }
1067
1068 static unsigned char *deflate_it(char *data,
1069 unsigned long size,
1070 unsigned long *result_size)
1071 {
1072 int bound;
1073 unsigned char *deflated;
1074 z_stream stream;
1075
1076 memset(&stream, 0, sizeof(stream));
1077 deflateInit(&stream, zlib_compression_level);
1078 bound = deflateBound(&stream, size);
1079 deflated = xmalloc(bound);
1080 stream.next_out = deflated;
1081 stream.avail_out = bound;
1082
1083 stream.next_in = (unsigned char *)data;
1084 stream.avail_in = size;
1085 while (deflate(&stream, Z_FINISH) == Z_OK)
1086 ; /* nothing */
1087 deflateEnd(&stream);
1088 *result_size = stream.total_out;
1089 return deflated;
1090 }
1091
1092 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1093 {
1094 void *cp;
1095 void *delta;
1096 void *deflated;
1097 void *data;
1098 unsigned long orig_size;
1099 unsigned long delta_size;
1100 unsigned long deflate_size;
1101 unsigned long data_size;
1102
1103 /* We could do deflated delta, or we could do just deflated two,
1104 * whichever is smaller.
1105 */
1106 delta = NULL;
1107 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1108 if (one->size && two->size) {
1109 delta = diff_delta(one->ptr, one->size,
1110 two->ptr, two->size,
1111 &delta_size, deflate_size);
1112 if (delta) {
1113 void *to_free = delta;
1114 orig_size = delta_size;
1115 delta = deflate_it(delta, delta_size, &delta_size);
1116 free(to_free);
1117 }
1118 }
1119
1120 if (delta && delta_size < deflate_size) {
1121 printf("delta %lu\n", orig_size);
1122 free(deflated);
1123 data = delta;
1124 data_size = delta_size;
1125 }
1126 else {
1127 printf("literal %lu\n", two->size);
1128 free(delta);
1129 data = deflated;
1130 data_size = deflate_size;
1131 }
1132
1133 /* emit data encoded in base85 */
1134 cp = data;
1135 while (data_size) {
1136 int bytes = (52 < data_size) ? 52 : data_size;
1137 char line[70];
1138 data_size -= bytes;
1139 if (bytes <= 26)
1140 line[0] = bytes + 'A' - 1;
1141 else
1142 line[0] = bytes - 26 + 'a' - 1;
1143 encode_85(line + 1, cp, bytes);
1144 cp = (char *) cp + bytes;
1145 puts(line);
1146 }
1147 printf("\n");
1148 free(data);
1149 }
1150
1151 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1152 {
1153 printf("GIT binary patch\n");
1154 emit_binary_diff_body(one, two);
1155 emit_binary_diff_body(two, one);
1156 }
1157
1158 static void setup_diff_attr_check(struct git_attr_check *check)
1159 {
1160 static struct git_attr *attr_diff;
1161
1162 if (!attr_diff) {
1163 attr_diff = git_attr("diff", 4);
1164 }
1165 check[0].attr = attr_diff;
1166 }
1167
1168 static void diff_filespec_check_attr(struct diff_filespec *one)
1169 {
1170 struct git_attr_check attr_diff_check;
1171 int check_from_data = 0;
1172
1173 if (one->checked_attr)
1174 return;
1175
1176 setup_diff_attr_check(&attr_diff_check);
1177 one->is_binary = 0;
1178 one->funcname_pattern_ident = NULL;
1179
1180 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1181 const char *value;
1182
1183 /* binaryness */
1184 value = attr_diff_check.value;
1185 if (ATTR_TRUE(value))
1186 ;
1187 else if (ATTR_FALSE(value))
1188 one->is_binary = 1;
1189 else
1190 check_from_data = 1;
1191
1192 /* funcname pattern ident */
1193 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1194 ;
1195 else
1196 one->funcname_pattern_ident = value;
1197 }
1198
1199 if (check_from_data) {
1200 if (!one->data && DIFF_FILE_VALID(one))
1201 diff_populate_filespec(one, 0);
1202
1203 if (one->data)
1204 one->is_binary = buffer_is_binary(one->data, one->size);
1205 }
1206 }
1207
1208 int diff_filespec_is_binary(struct diff_filespec *one)
1209 {
1210 diff_filespec_check_attr(one);
1211 return one->is_binary;
1212 }
1213
1214 static const char *funcname_pattern(const char *ident)
1215 {
1216 struct funcname_pattern *pp;
1217
1218 read_config_if_needed();
1219 for (pp = funcname_pattern_list; pp; pp = pp->next)
1220 if (!strcmp(ident, pp->name))
1221 return pp->pattern;
1222 return NULL;
1223 }
1224
1225 static struct builtin_funcname_pattern {
1226 const char *name;
1227 const char *pattern;
1228 } builtin_funcname_pattern[] = {
1229 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1230 "new\\|return\\|switch\\|throw\\|while\\)\n"
1231 "^[ ]*\\(\\([ ]*"
1232 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1233 "[ ]*([^;]*$\\)" },
1234 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1235 };
1236
1237 static const char *diff_funcname_pattern(struct diff_filespec *one)
1238 {
1239 const char *ident, *pattern;
1240 int i;
1241
1242 diff_filespec_check_attr(one);
1243 ident = one->funcname_pattern_ident;
1244
1245 if (!ident)
1246 /*
1247 * If the config file has "funcname.default" defined, that
1248 * regexp is used; otherwise NULL is returned and xemit uses
1249 * the built-in default.
1250 */
1251 return funcname_pattern("default");
1252
1253 /* Look up custom "funcname.$ident" regexp from config. */
1254 pattern = funcname_pattern(ident);
1255 if (pattern)
1256 return pattern;
1257
1258 /*
1259 * And define built-in fallback patterns here. Note that
1260 * these can be overriden by the user's config settings.
1261 */
1262 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1263 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1264 return builtin_funcname_pattern[i].pattern;
1265
1266 return NULL;
1267 }
1268
1269 static void builtin_diff(const char *name_a,
1270 const char *name_b,
1271 struct diff_filespec *one,
1272 struct diff_filespec *two,
1273 const char *xfrm_msg,
1274 struct diff_options *o,
1275 int complete_rewrite)
1276 {
1277 mmfile_t mf1, mf2;
1278 const char *lbl[2];
1279 char *a_one, *b_two;
1280 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1281 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
1282
1283 a_one = quote_two("a/", name_a + (*name_a == '/'));
1284 b_two = quote_two("b/", name_b + (*name_b == '/'));
1285 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1286 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1287 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1288 if (lbl[0][0] == '/') {
1289 /* /dev/null */
1290 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1291 if (xfrm_msg && xfrm_msg[0])
1292 printf("%s%s%s\n", set, xfrm_msg, reset);
1293 }
1294 else if (lbl[1][0] == '/') {
1295 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1296 if (xfrm_msg && xfrm_msg[0])
1297 printf("%s%s%s\n", set, xfrm_msg, reset);
1298 }
1299 else {
1300 if (one->mode != two->mode) {
1301 printf("%sold mode %06o%s\n", set, one->mode, reset);
1302 printf("%snew mode %06o%s\n", set, two->mode, reset);
1303 }
1304 if (xfrm_msg && xfrm_msg[0])
1305 printf("%s%s%s\n", set, xfrm_msg, reset);
1306 /*
1307 * we do not run diff between different kind
1308 * of objects.
1309 */
1310 if ((one->mode ^ two->mode) & S_IFMT)
1311 goto free_ab_and_return;
1312 if (complete_rewrite) {
1313 emit_rewrite_diff(name_a, name_b, one, two,
1314 o->color_diff);
1315 o->found_changes = 1;
1316 goto free_ab_and_return;
1317 }
1318 }
1319
1320 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1321 die("unable to read files to diff");
1322
1323 if (!o->text &&
1324 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1325 /* Quite common confusing case */
1326 if (mf1.size == mf2.size &&
1327 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1328 goto free_ab_and_return;
1329 if (o->binary)
1330 emit_binary_diff(&mf1, &mf2);
1331 else
1332 printf("Binary files %s and %s differ\n",
1333 lbl[0], lbl[1]);
1334 o->found_changes = 1;
1335 }
1336 else {
1337 /* Crazy xdl interfaces.. */
1338 const char *diffopts = getenv("GIT_DIFF_OPTS");
1339 xpparam_t xpp;
1340 xdemitconf_t xecfg;
1341 xdemitcb_t ecb;
1342 struct emit_callback ecbdata;
1343 const char *funcname_pattern;
1344
1345 funcname_pattern = diff_funcname_pattern(one);
1346 if (!funcname_pattern)
1347 funcname_pattern = diff_funcname_pattern(two);
1348
1349 memset(&xecfg, 0, sizeof(xecfg));
1350 memset(&ecbdata, 0, sizeof(ecbdata));
1351 ecbdata.label_path = lbl;
1352 ecbdata.color_diff = o->color_diff;
1353 ecbdata.found_changesp = &o->found_changes;
1354 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1355 xecfg.ctxlen = o->context;
1356 xecfg.flags = XDL_EMIT_FUNCNAMES;
1357 if (funcname_pattern)
1358 xdiff_set_find_func(&xecfg, funcname_pattern);
1359 if (!diffopts)
1360 ;
1361 else if (!prefixcmp(diffopts, "--unified="))
1362 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1363 else if (!prefixcmp(diffopts, "-u"))
1364 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1365 ecb.outf = xdiff_outf;
1366 ecb.priv = &ecbdata;
1367 ecbdata.xm.consume = fn_out_consume;
1368 if (o->color_diff_words)
1369 ecbdata.diff_words =
1370 xcalloc(1, sizeof(struct diff_words_data));
1371 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1372 if (o->color_diff_words)
1373 free_diff_words_data(&ecbdata);
1374 }
1375
1376 free_ab_and_return:
1377 diff_free_filespec_data(one);
1378 diff_free_filespec_data(two);
1379 free(a_one);
1380 free(b_two);
1381 return;
1382 }
1383
1384 static void builtin_diffstat(const char *name_a, const char *name_b,
1385 struct diff_filespec *one,
1386 struct diff_filespec *two,
1387 struct diffstat_t *diffstat,
1388 struct diff_options *o,
1389 int complete_rewrite)
1390 {
1391 mmfile_t mf1, mf2;
1392 struct diffstat_file *data;
1393
1394 data = diffstat_add(diffstat, name_a, name_b);
1395
1396 if (!one || !two) {
1397 data->is_unmerged = 1;
1398 return;
1399 }
1400 if (complete_rewrite) {
1401 diff_populate_filespec(one, 0);
1402 diff_populate_filespec(two, 0);
1403 data->deleted = count_lines(one->data, one->size);
1404 data->added = count_lines(two->data, two->size);
1405 goto free_and_return;
1406 }
1407 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1408 die("unable to read files to diff");
1409
1410 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1411 data->is_binary = 1;
1412 data->added = mf2.size;
1413 data->deleted = mf1.size;
1414 } else {
1415 /* Crazy xdl interfaces.. */
1416 xpparam_t xpp;
1417 xdemitconf_t xecfg;
1418 xdemitcb_t ecb;
1419
1420 memset(&xecfg, 0, sizeof(xecfg));
1421 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1422 ecb.outf = xdiff_outf;
1423 ecb.priv = diffstat;
1424 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1425 }
1426
1427 free_and_return:
1428 diff_free_filespec_data(one);
1429 diff_free_filespec_data(two);
1430 }
1431
1432 static void builtin_checkdiff(const char *name_a, const char *name_b,
1433 struct diff_filespec *one,
1434 struct diff_filespec *two, struct diff_options *o)
1435 {
1436 mmfile_t mf1, mf2;
1437 struct checkdiff_t data;
1438
1439 if (!two)
1440 return;
1441
1442 memset(&data, 0, sizeof(data));
1443 data.xm.consume = checkdiff_consume;
1444 data.filename = name_b ? name_b : name_a;
1445 data.lineno = 0;
1446 data.color_diff = o->color_diff;
1447
1448 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1449 die("unable to read files to diff");
1450
1451 if (diff_filespec_is_binary(two))
1452 goto free_and_return;
1453 else {
1454 /* Crazy xdl interfaces.. */
1455 xpparam_t xpp;
1456 xdemitconf_t xecfg;
1457 xdemitcb_t ecb;
1458
1459 memset(&xecfg, 0, sizeof(xecfg));
1460 xpp.flags = XDF_NEED_MINIMAL;
1461 ecb.outf = xdiff_outf;
1462 ecb.priv = &data;
1463 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1464 }
1465 free_and_return:
1466 diff_free_filespec_data(one);
1467 diff_free_filespec_data(two);
1468 }
1469
1470 struct diff_filespec *alloc_filespec(const char *path)
1471 {
1472 int namelen = strlen(path);
1473 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1474
1475 memset(spec, 0, sizeof(*spec));
1476 spec->path = (char *)(spec + 1);
1477 memcpy(spec->path, path, namelen+1);
1478 return spec;
1479 }
1480
1481 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1482 unsigned short mode)
1483 {
1484 if (mode) {
1485 spec->mode = canon_mode(mode);
1486 hashcpy(spec->sha1, sha1);
1487 spec->sha1_valid = !is_null_sha1(sha1);
1488 }
1489 }
1490
1491 /*
1492 * Given a name and sha1 pair, if the index tells us the file in
1493 * the work tree has that object contents, return true, so that
1494 * prepare_temp_file() does not have to inflate and extract.
1495 */
1496 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1497 {
1498 struct cache_entry *ce;
1499 struct stat st;
1500 int pos, len;
1501
1502 /* We do not read the cache ourselves here, because the
1503 * benchmark with my previous version that always reads cache
1504 * shows that it makes things worse for diff-tree comparing
1505 * two linux-2.6 kernel trees in an already checked out work
1506 * tree. This is because most diff-tree comparisons deal with
1507 * only a small number of files, while reading the cache is
1508 * expensive for a large project, and its cost outweighs the
1509 * savings we get by not inflating the object to a temporary
1510 * file. Practically, this code only helps when we are used
1511 * by diff-cache --cached, which does read the cache before
1512 * calling us.
1513 */
1514 if (!active_cache)
1515 return 0;
1516
1517 /* We want to avoid the working directory if our caller
1518 * doesn't need the data in a normal file, this system
1519 * is rather slow with its stat/open/mmap/close syscalls,
1520 * and the object is contained in a pack file. The pack
1521 * is probably already open and will be faster to obtain
1522 * the data through than the working directory. Loose
1523 * objects however would tend to be slower as they need
1524 * to be individually opened and inflated.
1525 */
1526 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1527 return 0;
1528
1529 len = strlen(name);
1530 pos = cache_name_pos(name, len);
1531 if (pos < 0)
1532 return 0;
1533 ce = active_cache[pos];
1534 if ((lstat(name, &st) < 0) ||
1535 !S_ISREG(st.st_mode) || /* careful! */
1536 ce_match_stat(ce, &st, 0) ||
1537 hashcmp(sha1, ce->sha1))
1538 return 0;
1539 /* we return 1 only when we can stat, it is a regular file,
1540 * stat information matches, and sha1 recorded in the cache
1541 * matches. I.e. we know the file in the work tree really is
1542 * the same as the <name, sha1> pair.
1543 */
1544 return 1;
1545 }
1546
1547 static int populate_from_stdin(struct diff_filespec *s)
1548 {
1549 #define INCREMENT 1024
1550 char *buf;
1551 unsigned long size;
1552 ssize_t got;
1553
1554 size = 0;
1555 buf = NULL;
1556 while (1) {
1557 buf = xrealloc(buf, size + INCREMENT);
1558 got = xread(0, buf + size, INCREMENT);
1559 if (!got)
1560 break; /* EOF */
1561 if (got < 0)
1562 return error("error while reading from stdin %s",
1563 strerror(errno));
1564 size += got;
1565 }
1566 s->should_munmap = 0;
1567 s->data = buf;
1568 s->size = size;
1569 s->should_free = 1;
1570 return 0;
1571 }
1572
1573 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1574 {
1575 int len;
1576 char *data = xmalloc(100);
1577 len = snprintf(data, 100,
1578 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1579 s->data = data;
1580 s->size = len;
1581 s->should_free = 1;
1582 if (size_only) {
1583 s->data = NULL;
1584 free(data);
1585 }
1586 return 0;
1587 }
1588
1589 /*
1590 * While doing rename detection and pickaxe operation, we may need to
1591 * grab the data for the blob (or file) for our own in-core comparison.
1592 * diff_filespec has data and size fields for this purpose.
1593 */
1594 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1595 {
1596 int err = 0;
1597 if (!DIFF_FILE_VALID(s))
1598 die("internal error: asking to populate invalid file.");
1599 if (S_ISDIR(s->mode))
1600 return -1;
1601
1602 if (s->data)
1603 return 0;
1604
1605 if (size_only && 0 < s->size)
1606 return 0;
1607
1608 if (S_ISGITLINK(s->mode))
1609 return diff_populate_gitlink(s, size_only);
1610
1611 if (!s->sha1_valid ||
1612 reuse_worktree_file(s->path, s->sha1, 0)) {
1613 struct stat st;
1614 int fd;
1615 char *buf;
1616 unsigned long size;
1617
1618 if (!strcmp(s->path, "-"))
1619 return populate_from_stdin(s);
1620
1621 if (lstat(s->path, &st) < 0) {
1622 if (errno == ENOENT) {
1623 err_empty:
1624 err = -1;
1625 empty:
1626 s->data = (char *)"";
1627 s->size = 0;
1628 return err;
1629 }
1630 }
1631 s->size = xsize_t(st.st_size);
1632 if (!s->size)
1633 goto empty;
1634 if (size_only)
1635 return 0;
1636 if (S_ISLNK(st.st_mode)) {
1637 int ret;
1638 s->data = xmalloc(s->size);
1639 s->should_free = 1;
1640 ret = readlink(s->path, s->data, s->size);
1641 if (ret < 0) {
1642 free(s->data);
1643 goto err_empty;
1644 }
1645 return 0;
1646 }
1647 fd = open(s->path, O_RDONLY);
1648 if (fd < 0)
1649 goto err_empty;
1650 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1651 close(fd);
1652 s->should_munmap = 1;
1653
1654 /*
1655 * Convert from working tree format to canonical git format
1656 */
1657 size = s->size;
1658 buf = convert_to_git(s->path, s->data, &size);
1659 if (buf) {
1660 munmap(s->data, s->size);
1661 s->should_munmap = 0;
1662 s->data = buf;
1663 s->size = size;
1664 s->should_free = 1;
1665 }
1666 }
1667 else {
1668 enum object_type type;
1669 if (size_only)
1670 type = sha1_object_info(s->sha1, &s->size);
1671 else {
1672 s->data = read_sha1_file(s->sha1, &type, &s->size);
1673 s->should_free = 1;
1674 }
1675 }
1676 return 0;
1677 }
1678
1679 void diff_free_filespec_data(struct diff_filespec *s)
1680 {
1681 if (s->should_free)
1682 free(s->data);
1683 else if (s->should_munmap)
1684 munmap(s->data, s->size);
1685
1686 if (s->should_free || s->should_munmap) {
1687 s->should_free = s->should_munmap = 0;
1688 s->data = NULL;
1689 }
1690 free(s->cnt_data);
1691 s->cnt_data = NULL;
1692 }
1693
1694 static void prep_temp_blob(struct diff_tempfile *temp,
1695 void *blob,
1696 unsigned long size,
1697 const unsigned char *sha1,
1698 int mode)
1699 {
1700 int fd;
1701
1702 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1703 if (fd < 0)
1704 die("unable to create temp-file: %s", strerror(errno));
1705 if (write_in_full(fd, blob, size) != size)
1706 die("unable to write temp-file");
1707 close(fd);
1708 temp->name = temp->tmp_path;
1709 strcpy(temp->hex, sha1_to_hex(sha1));
1710 temp->hex[40] = 0;
1711 sprintf(temp->mode, "%06o", mode);
1712 }
1713
1714 static void prepare_temp_file(const char *name,
1715 struct diff_tempfile *temp,
1716 struct diff_filespec *one)
1717 {
1718 if (!DIFF_FILE_VALID(one)) {
1719 not_a_valid_file:
1720 /* A '-' entry produces this for file-2, and
1721 * a '+' entry produces this for file-1.
1722 */
1723 temp->name = "/dev/null";
1724 strcpy(temp->hex, ".");
1725 strcpy(temp->mode, ".");
1726 return;
1727 }
1728
1729 if (!one->sha1_valid ||
1730 reuse_worktree_file(name, one->sha1, 1)) {
1731 struct stat st;
1732 if (lstat(name, &st) < 0) {
1733 if (errno == ENOENT)
1734 goto not_a_valid_file;
1735 die("stat(%s): %s", name, strerror(errno));
1736 }
1737 if (S_ISLNK(st.st_mode)) {
1738 int ret;
1739 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1740 size_t sz = xsize_t(st.st_size);
1741 if (sizeof(buf) <= st.st_size)
1742 die("symlink too long: %s", name);
1743 ret = readlink(name, buf, sz);
1744 if (ret < 0)
1745 die("readlink(%s)", name);
1746 prep_temp_blob(temp, buf, sz,
1747 (one->sha1_valid ?
1748 one->sha1 : null_sha1),
1749 (one->sha1_valid ?
1750 one->mode : S_IFLNK));
1751 }
1752 else {
1753 /* we can borrow from the file in the work tree */
1754 temp->name = name;
1755 if (!one->sha1_valid)
1756 strcpy(temp->hex, sha1_to_hex(null_sha1));
1757 else
1758 strcpy(temp->hex, sha1_to_hex(one->sha1));
1759 /* Even though we may sometimes borrow the
1760 * contents from the work tree, we always want
1761 * one->mode. mode is trustworthy even when
1762 * !(one->sha1_valid), as long as
1763 * DIFF_FILE_VALID(one).
1764 */
1765 sprintf(temp->mode, "%06o", one->mode);
1766 }
1767 return;
1768 }
1769 else {
1770 if (diff_populate_filespec(one, 0))
1771 die("cannot read data blob for %s", one->path);
1772 prep_temp_blob(temp, one->data, one->size,
1773 one->sha1, one->mode);
1774 }
1775 }
1776
1777 static void remove_tempfile(void)
1778 {
1779 int i;
1780
1781 for (i = 0; i < 2; i++)
1782 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1783 unlink(diff_temp[i].name);
1784 diff_temp[i].name = NULL;
1785 }
1786 }
1787
1788 static void remove_tempfile_on_signal(int signo)
1789 {
1790 remove_tempfile();
1791 signal(SIGINT, SIG_DFL);
1792 raise(signo);
1793 }
1794
1795 static int spawn_prog(const char *pgm, const char **arg)
1796 {
1797 pid_t pid;
1798 int status;
1799
1800 fflush(NULL);
1801 pid = spawnvpe_pipe(pgm, arg, (const char**) environ, NULL, NULL);
1802 if (pid < 0)
1803 die("unable to fork");
1804
1805 while (waitpid(pid, &status, 0) < 0) {
1806 if (errno == EINTR)
1807 continue;
1808 return -1;
1809 }
1810
1811 /* Earlier we did not check the exit status because
1812 * diff exits non-zero if files are different, and
1813 * we are not interested in knowing that. It was a
1814 * mistake which made it harder to quit a diff-*
1815 * session that uses the git-apply-patch-script as
1816 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1817 * should also exit non-zero only when it wants to
1818 * abort the entire diff-* session.
1819 */
1820 if (WIFEXITED(status) && !WEXITSTATUS(status))
1821 return 0;
1822 return -1;
1823 }
1824
1825 /* An external diff command takes:
1826 *
1827 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1828 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1829 *
1830 */
1831 static void run_external_diff(const char *pgm,
1832 const char *name,
1833 const char *other,
1834 struct diff_filespec *one,
1835 struct diff_filespec *two,
1836 const char *xfrm_msg,
1837 int complete_rewrite)
1838 {
1839 const char *spawn_arg[10];
1840 struct diff_tempfile *temp = diff_temp;
1841 int retval;
1842 static int atexit_asked = 0;
1843 const char *othername;
1844 const char **arg = &spawn_arg[1];
1845
1846 othername = (other? other : name);
1847 if (one && two) {
1848 prepare_temp_file(name, &temp[0], one);
1849 prepare_temp_file(othername, &temp[1], two);
1850 if (! atexit_asked &&
1851 (temp[0].name == temp[0].tmp_path ||
1852 temp[1].name == temp[1].tmp_path)) {
1853 atexit_asked = 1;
1854 atexit(remove_tempfile);
1855 }
1856 signal(SIGINT, remove_tempfile_on_signal);
1857 }
1858
1859 if (one && two) {
1860 *arg++ = name;
1861 *arg++ = temp[0].name;
1862 *arg++ = temp[0].hex;
1863 *arg++ = temp[0].mode;
1864 *arg++ = temp[1].name;
1865 *arg++ = temp[1].hex;
1866 *arg++ = temp[1].mode;
1867 if (other) {
1868 *arg++ = other;
1869 *arg++ = xfrm_msg;
1870 }
1871 } else {
1872 *arg++ = name;
1873 }
1874 *arg = NULL;
1875 retval = spawn_prog(pgm, spawn_arg);
1876 remove_tempfile();
1877 if (retval) {
1878 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1879 exit(1);
1880 }
1881 }
1882
1883 static const char *external_diff_attr(const char *name)
1884 {
1885 struct git_attr_check attr_diff_check;
1886
1887 setup_diff_attr_check(&attr_diff_check);
1888 if (!git_checkattr(name, 1, &attr_diff_check)) {
1889 const char *value = attr_diff_check.value;
1890 if (!ATTR_TRUE(value) &&
1891 !ATTR_FALSE(value) &&
1892 !ATTR_UNSET(value)) {
1893 struct ll_diff_driver *drv;
1894
1895 read_config_if_needed();
1896 for (drv = user_diff; drv; drv = drv->next)
1897 if (!strcmp(drv->name, value))
1898 return drv->cmd;
1899 }
1900 }
1901 return NULL;
1902 }
1903
1904 static void run_diff_cmd(const char *pgm,
1905 const char *name,
1906 const char *other,
1907 struct diff_filespec *one,
1908 struct diff_filespec *two,
1909 const char *xfrm_msg,
1910 struct diff_options *o,
1911 int complete_rewrite)
1912 {
1913 if (!o->allow_external)
1914 pgm = NULL;
1915 else {
1916 const char *cmd = external_diff_attr(name);
1917 if (cmd)
1918 pgm = cmd;
1919 }
1920
1921 if (pgm) {
1922 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1923 complete_rewrite);
1924 return;
1925 }
1926 if (one && two)
1927 builtin_diff(name, other ? other : name,
1928 one, two, xfrm_msg, o, complete_rewrite);
1929 else
1930 printf("* Unmerged path %s\n", name);
1931 }
1932
1933 static void diff_fill_sha1_info(struct diff_filespec *one)
1934 {
1935 if (DIFF_FILE_VALID(one)) {
1936 if (!one->sha1_valid) {
1937 struct stat st;
1938 if (!strcmp(one->path, "-")) {
1939 hashcpy(one->sha1, null_sha1);
1940 return;
1941 }
1942 if (lstat(one->path, &st) < 0)
1943 die("stat %s", one->path);
1944 if (index_path(one->sha1, one->path, &st, 0))
1945 die("cannot hash %s\n", one->path);
1946 }
1947 }
1948 else
1949 hashclr(one->sha1);
1950 }
1951
1952 static int similarity_index(struct diff_filepair *p)
1953 {
1954 return p->score * 100 / MAX_SCORE;
1955 }
1956
1957 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1958 {
1959 const char *pgm = external_diff();
1960 char msg[PATH_MAX*2+300], *xfrm_msg;
1961 struct diff_filespec *one;
1962 struct diff_filespec *two;
1963 const char *name;
1964 const char *other;
1965 char *name_munged, *other_munged;
1966 int complete_rewrite = 0;
1967 int len;
1968
1969 if (DIFF_PAIR_UNMERGED(p)) {
1970 /* unmerged */
1971 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1972 return;
1973 }
1974
1975 name = p->one->path;
1976 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1977 name_munged = quote_one(name);
1978 other_munged = quote_one(other);
1979 one = p->one; two = p->two;
1980
1981 diff_fill_sha1_info(one);
1982 diff_fill_sha1_info(two);
1983
1984 len = 0;
1985 switch (p->status) {
1986 case DIFF_STATUS_COPIED:
1987 len += snprintf(msg + len, sizeof(msg) - len,
1988 "similarity index %d%%\n"
1989 "copy from %s\n"
1990 "copy to %s\n",
1991 similarity_index(p), name_munged, other_munged);
1992 break;
1993 case DIFF_STATUS_RENAMED:
1994 len += snprintf(msg + len, sizeof(msg) - len,
1995 "similarity index %d%%\n"
1996 "rename from %s\n"
1997 "rename to %s\n",
1998 similarity_index(p), name_munged, other_munged);
1999 break;
2000 case DIFF_STATUS_MODIFIED:
2001 if (p->score) {
2002 len += snprintf(msg + len, sizeof(msg) - len,
2003 "dissimilarity index %d%%\n",
2004 similarity_index(p));
2005 complete_rewrite = 1;
2006 break;
2007 }
2008 /* fallthru */
2009 default:
2010 /* nothing */
2011 ;
2012 }
2013
2014 if (hashcmp(one->sha1, two->sha1)) {
2015 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
2016
2017 if (o->binary) {
2018 mmfile_t mf;
2019 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2020 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2021 abbrev = 40;
2022 }
2023 len += snprintf(msg + len, sizeof(msg) - len,
2024 "index %.*s..%.*s",
2025 abbrev, sha1_to_hex(one->sha1),
2026 abbrev, sha1_to_hex(two->sha1));
2027 if (one->mode == two->mode)
2028 len += snprintf(msg + len, sizeof(msg) - len,
2029 " %06o", one->mode);
2030 len += snprintf(msg + len, sizeof(msg) - len, "\n");
2031 }
2032
2033 if (len)
2034 msg[--len] = 0;
2035 xfrm_msg = len ? msg : NULL;
2036
2037 if (!pgm &&
2038 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2039 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2040 /* a filepair that changes between file and symlink
2041 * needs to be split into deletion and creation.
2042 */
2043 struct diff_filespec *null = alloc_filespec(two->path);
2044 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
2045 free(null);
2046 null = alloc_filespec(one->path);
2047 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
2048 free(null);
2049 }
2050 else
2051 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
2052 complete_rewrite);
2053
2054 free(name_munged);
2055 free(other_munged);
2056 }
2057
2058 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2059 struct diffstat_t *diffstat)
2060 {
2061 const char *name;
2062 const char *other;
2063 int complete_rewrite = 0;
2064
2065 if (DIFF_PAIR_UNMERGED(p)) {
2066 /* unmerged */
2067 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2068 return;
2069 }
2070
2071 name = p->one->path;
2072 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2073
2074 diff_fill_sha1_info(p->one);
2075 diff_fill_sha1_info(p->two);
2076
2077 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2078 complete_rewrite = 1;
2079 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2080 }
2081
2082 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2083 {
2084 const char *name;
2085 const char *other;
2086
2087 if (DIFF_PAIR_UNMERGED(p)) {
2088 /* unmerged */
2089 return;
2090 }
2091
2092 name = p->one->path;
2093 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2094
2095 diff_fill_sha1_info(p->one);
2096 diff_fill_sha1_info(p->two);
2097
2098 builtin_checkdiff(name, other, p->one, p->two, o);
2099 }
2100
2101 void diff_setup(struct diff_options *options)
2102 {
2103 memset(options, 0, sizeof(*options));
2104 options->line_termination = '\n';
2105 options->break_opt = -1;
2106 options->rename_limit = -1;
2107 options->context = 3;
2108 options->msg_sep = "";
2109
2110 options->change = diff_change;
2111 options->add_remove = diff_addremove;
2112 options->color_diff = diff_use_color_default;
2113 options->detect_rename = diff_detect_rename_default;
2114 }
2115
2116 int diff_setup_done(struct diff_options *options)
2117 {
2118 int count = 0;
2119
2120 if (options->output_format & DIFF_FORMAT_NAME)
2121 count++;
2122 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2123 count++;
2124 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2125 count++;
2126 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2127 count++;
2128 if (count > 1)
2129 die("--name-only, --name-status, --check and -s are mutually exclusive");
2130
2131 if (options->find_copies_harder)
2132 options->detect_rename = DIFF_DETECT_COPY;
2133
2134 if (options->output_format & (DIFF_FORMAT_NAME |
2135 DIFF_FORMAT_NAME_STATUS |
2136 DIFF_FORMAT_CHECKDIFF |
2137 DIFF_FORMAT_NO_OUTPUT))
2138 options->output_format &= ~(DIFF_FORMAT_RAW |
2139 DIFF_FORMAT_NUMSTAT |
2140 DIFF_FORMAT_DIFFSTAT |
2141 DIFF_FORMAT_SHORTSTAT |
2142 DIFF_FORMAT_SUMMARY |
2143 DIFF_FORMAT_PATCH);
2144
2145 /*
2146 * These cases always need recursive; we do not drop caller-supplied
2147 * recursive bits for other formats here.
2148 */
2149 if (options->output_format & (DIFF_FORMAT_PATCH |
2150 DIFF_FORMAT_NUMSTAT |
2151 DIFF_FORMAT_DIFFSTAT |
2152 DIFF_FORMAT_SHORTSTAT |
2153 DIFF_FORMAT_SUMMARY |
2154 DIFF_FORMAT_CHECKDIFF))
2155 options->recursive = 1;
2156 /*
2157 * Also pickaxe would not work very well if you do not say recursive
2158 */
2159 if (options->pickaxe)
2160 options->recursive = 1;
2161
2162 if (options->detect_rename && options->rename_limit < 0)
2163 options->rename_limit = diff_rename_limit_default;
2164 if (options->setup & DIFF_SETUP_USE_CACHE) {
2165 if (!active_cache)
2166 /* read-cache does not die even when it fails
2167 * so it is safe for us to do this here. Also
2168 * it does not smudge active_cache or active_nr
2169 * when it fails, so we do not have to worry about
2170 * cleaning it up ourselves either.
2171 */
2172 read_cache();
2173 }
2174 if (options->abbrev <= 0 || 40 < options->abbrev)
2175 options->abbrev = 40; /* full */
2176
2177 /*
2178 * It does not make sense to show the first hit we happened
2179 * to have found. It does not make sense not to return with
2180 * exit code in such a case either.
2181 */
2182 if (options->quiet) {
2183 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2184 options->exit_with_status = 1;
2185 }
2186
2187 /*
2188 * If we postprocess in diffcore, we cannot simply return
2189 * upon the first hit. We need to run diff as usual.
2190 */
2191 if (options->pickaxe || options->filter)
2192 options->quiet = 0;
2193
2194 return 0;
2195 }
2196
2197 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2198 {
2199 char c, *eq;
2200 int len;
2201
2202 if (*arg != '-')
2203 return 0;
2204 c = *++arg;
2205 if (!c)
2206 return 0;
2207 if (c == arg_short) {
2208 c = *++arg;
2209 if (!c)
2210 return 1;
2211 if (val && isdigit(c)) {
2212 char *end;
2213 int n = strtoul(arg, &end, 10);
2214 if (*end)
2215 return 0;
2216 *val = n;
2217 return 1;
2218 }
2219 return 0;
2220 }
2221 if (c != '-')
2222 return 0;
2223 arg++;
2224 eq = strchr(arg, '=');
2225 if (eq)
2226 len = eq - arg;
2227 else
2228 len = strlen(arg);
2229 if (!len || strncmp(arg, arg_long, len))
2230 return 0;
2231 if (eq) {
2232 int n;
2233 char *end;
2234 if (!isdigit(*++eq))
2235 return 0;
2236 n = strtoul(eq, &end, 10);
2237 if (*end)
2238 return 0;
2239 *val = n;
2240 }
2241 return 1;
2242 }
2243
2244 static int diff_scoreopt_parse(const char *opt);
2245
2246 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2247 {
2248 const char *arg = av[0];
2249 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2250 options->output_format |= DIFF_FORMAT_PATCH;
2251 else if (opt_arg(arg, 'U', "unified", &options->context))
2252 options->output_format |= DIFF_FORMAT_PATCH;
2253 else if (!strcmp(arg, "--raw"))
2254 options->output_format |= DIFF_FORMAT_RAW;
2255 else if (!strcmp(arg, "--patch-with-raw")) {
2256 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2257 }
2258 else if (!strcmp(arg, "--numstat")) {
2259 options->output_format |= DIFF_FORMAT_NUMSTAT;
2260 }
2261 else if (!strcmp(arg, "--shortstat")) {
2262 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2263 }
2264 else if (!prefixcmp(arg, "--stat")) {
2265 char *end;
2266 int width = options->stat_width;
2267 int name_width = options->stat_name_width;
2268 arg += 6;
2269 end = (char *)arg;
2270
2271 switch (*arg) {
2272 case '-':
2273 if (!prefixcmp(arg, "-width="))
2274 width = strtoul(arg + 7, &end, 10);
2275 else if (!prefixcmp(arg, "-name-width="))
2276 name_width = strtoul(arg + 12, &end, 10);
2277 break;
2278 case '=':
2279 width = strtoul(arg+1, &end, 10);
2280 if (*end == ',')
2281 name_width = strtoul(end+1, &end, 10);
2282 }
2283
2284 /* Important! This checks all the error cases! */
2285 if (*end)
2286 return 0;
2287 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2288 options->stat_name_width = name_width;
2289 options->stat_width = width;
2290 }
2291 else if (!strcmp(arg, "--check"))
2292 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2293 else if (!strcmp(arg, "--summary"))
2294 options->output_format |= DIFF_FORMAT_SUMMARY;
2295 else if (!strcmp(arg, "--patch-with-stat")) {
2296 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2297 }
2298 else if (!strcmp(arg, "-z"))
2299 options->line_termination = 0;
2300 else if (!prefixcmp(arg, "-l"))
2301 options->rename_limit = strtoul(arg+2, NULL, 10);
2302 else if (!strcmp(arg, "--full-index"))
2303 options->full_index = 1;
2304 else if (!strcmp(arg, "--binary")) {
2305 options->output_format |= DIFF_FORMAT_PATCH;
2306 options->binary = 1;
2307 }
2308 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
2309 options->text = 1;
2310 }
2311 else if (!strcmp(arg, "--name-only"))
2312 options->output_format |= DIFF_FORMAT_NAME;
2313 else if (!strcmp(arg, "--name-status"))
2314 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2315 else if (!strcmp(arg, "-R"))
2316 options->reverse_diff = 1;
2317 else if (!prefixcmp(arg, "-S"))
2318 options->pickaxe = arg + 2;
2319 else if (!strcmp(arg, "-s")) {
2320 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2321 }
2322 else if (!prefixcmp(arg, "-O"))
2323 options->orderfile = arg + 2;
2324 else if (!prefixcmp(arg, "--diff-filter="))
2325 options->filter = arg + 14;
2326 else if (!strcmp(arg, "--pickaxe-all"))
2327 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2328 else if (!strcmp(arg, "--pickaxe-regex"))
2329 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2330 else if (!prefixcmp(arg, "-B")) {
2331 if ((options->break_opt =
2332 diff_scoreopt_parse(arg)) == -1)
2333 return -1;
2334 }
2335 else if (!prefixcmp(arg, "-M")) {
2336 if ((options->rename_score =
2337 diff_scoreopt_parse(arg)) == -1)
2338 return -1;
2339 options->detect_rename = DIFF_DETECT_RENAME;
2340 }
2341 else if (!prefixcmp(arg, "-C")) {
2342 if (options->detect_rename == DIFF_DETECT_COPY)
2343 options->find_copies_harder = 1;
2344 if ((options->rename_score =
2345 diff_scoreopt_parse(arg)) == -1)
2346 return -1;
2347 options->detect_rename = DIFF_DETECT_COPY;
2348 }
2349 else if (!strcmp(arg, "--find-copies-harder"))
2350 options->find_copies_harder = 1;
2351 else if (!strcmp(arg, "--follow"))
2352 options->follow_renames = 1;
2353 else if (!strcmp(arg, "--abbrev"))
2354 options->abbrev = DEFAULT_ABBREV;
2355 else if (!prefixcmp(arg, "--abbrev=")) {
2356 options->abbrev = strtoul(arg + 9, NULL, 10);
2357 if (options->abbrev < MINIMUM_ABBREV)
2358 options->abbrev = MINIMUM_ABBREV;
2359 else if (40 < options->abbrev)
2360 options->abbrev = 40;
2361 }
2362 else if (!strcmp(arg, "--color"))
2363 options->color_diff = 1;
2364 else if (!strcmp(arg, "--no-color"))
2365 options->color_diff = 0;
2366 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2367 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2368 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2369 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2370 else if (!strcmp(arg, "--ignore-space-at-eol"))
2371 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2372 else if (!strcmp(arg, "--color-words"))
2373 options->color_diff = options->color_diff_words = 1;
2374 else if (!strcmp(arg, "--no-renames"))
2375 options->detect_rename = 0;
2376 else if (!strcmp(arg, "--exit-code"))
2377 options->exit_with_status = 1;
2378 else if (!strcmp(arg, "--quiet"))
2379 options->quiet = 1;
2380 else if (!strcmp(arg, "--ext-diff"))
2381 options->allow_external = 1;
2382 else if (!strcmp(arg, "--no-ext-diff"))
2383 options->allow_external = 0;
2384 else
2385 return 0;
2386 return 1;
2387 }
2388
2389 static int parse_num(const char **cp_p)
2390 {
2391 unsigned long num, scale;
2392 int ch, dot;
2393 const char *cp = *cp_p;
2394
2395 num = 0;
2396 scale = 1;
2397 dot = 0;
2398 for(;;) {
2399 ch = *cp;
2400 if ( !dot && ch == '.' ) {
2401 scale = 1;
2402 dot = 1;
2403 } else if ( ch == '%' ) {
2404 scale = dot ? scale*100 : 100;
2405 cp++; /* % is always at the end */
2406 break;
2407 } else if ( ch >= '0' && ch <= '9' ) {
2408 if ( scale < 100000 ) {
2409 scale *= 10;
2410 num = (num*10) + (ch-'0');
2411 }
2412 } else {
2413 break;
2414 }
2415 cp++;
2416 }
2417 *cp_p = cp;
2418
2419 /* user says num divided by scale and we say internally that
2420 * is MAX_SCORE * num / scale.
2421 */
2422 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2423 }
2424
2425 static int diff_scoreopt_parse(const char *opt)
2426 {
2427 int opt1, opt2, cmd;
2428
2429 if (*opt++ != '-')
2430 return -1;
2431 cmd = *opt++;
2432 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2433 return -1; /* that is not a -M, -C nor -B option */
2434
2435 opt1 = parse_num(&opt);
2436 if (cmd != 'B')
2437 opt2 = 0;
2438 else {
2439 if (*opt == 0)
2440 opt2 = 0;
2441 else if (*opt != '/')
2442 return -1; /* we expect -B80/99 or -B80 */
2443 else {
2444 opt++;
2445 opt2 = parse_num(&opt);
2446 }
2447 }
2448 if (*opt != 0)
2449 return -1;
2450 return opt1 | (opt2 << 16);
2451 }
2452
2453 struct diff_queue_struct diff_queued_diff;
2454
2455 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2456 {
2457 if (queue->alloc <= queue->nr) {
2458 queue->alloc = alloc_nr(queue->alloc);
2459 queue->queue = xrealloc(queue->queue,
2460 sizeof(dp) * queue->alloc);
2461 }
2462 queue->queue[queue->nr++] = dp;
2463 }
2464
2465 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2466 struct diff_filespec *one,
2467 struct diff_filespec *two)
2468 {
2469 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2470 dp->one = one;
2471 dp->two = two;
2472 if (queue)
2473 diff_q(queue, dp);
2474 return dp;
2475 }
2476
2477 void diff_free_filepair(struct diff_filepair *p)
2478 {
2479 diff_free_filespec_data(p->one);
2480 diff_free_filespec_data(p->two);
2481 free(p->one);
2482 free(p->two);
2483 free(p);
2484 }
2485
2486 /* This is different from find_unique_abbrev() in that
2487 * it stuffs the result with dots for alignment.
2488 */
2489 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2490 {
2491 int abblen;
2492 const char *abbrev;
2493 if (len == 40)
2494 return sha1_to_hex(sha1);
2495
2496 abbrev = find_unique_abbrev(sha1, len);
2497 if (!abbrev)
2498 return sha1_to_hex(sha1);
2499 abblen = strlen(abbrev);
2500 if (abblen < 37) {
2501 static char hex[41];
2502 if (len < abblen && abblen <= len + 2)
2503 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2504 else
2505 sprintf(hex, "%s...", abbrev);
2506 return hex;
2507 }
2508 return sha1_to_hex(sha1);
2509 }
2510
2511 static void diff_flush_raw(struct diff_filepair *p,
2512 struct diff_options *options)
2513 {
2514 int two_paths;
2515 char status[10];
2516 int abbrev = options->abbrev;
2517 const char *path_one, *path_two;
2518 int inter_name_termination = '\t';
2519 int line_termination = options->line_termination;
2520
2521 if (!line_termination)
2522 inter_name_termination = 0;
2523
2524 path_one = p->one->path;
2525 path_two = p->two->path;
2526 if (line_termination) {
2527 path_one = quote_one(path_one);
2528 path_two = quote_one(path_two);
2529 }
2530
2531 if (p->score)
2532 sprintf(status, "%c%03d", p->status, similarity_index(p));
2533 else {
2534 status[0] = p->status;
2535 status[1] = 0;
2536 }
2537 switch (p->status) {
2538 case DIFF_STATUS_COPIED:
2539 case DIFF_STATUS_RENAMED:
2540 two_paths = 1;
2541 break;
2542 case DIFF_STATUS_ADDED:
2543 case DIFF_STATUS_DELETED:
2544 two_paths = 0;
2545 break;
2546 default:
2547 two_paths = 0;
2548 break;
2549 }
2550 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
2551 printf(":%06o %06o %s ",
2552 p->one->mode, p->two->mode,
2553 diff_unique_abbrev(p->one->sha1, abbrev));
2554 printf("%s ",
2555 diff_unique_abbrev(p->two->sha1, abbrev));
2556 }
2557 printf("%s%c%s", status, inter_name_termination,
2558 two_paths || p->one->mode ? path_one : path_two);
2559 if (two_paths)
2560 printf("%c%s", inter_name_termination, path_two);
2561 putchar(line_termination);
2562 if (path_one != p->one->path)
2563 free((void*)path_one);
2564 if (path_two != p->two->path)
2565 free((void*)path_two);
2566 }
2567
2568 static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
2569 {
2570 char *path = p->two->path;
2571
2572 if (opt->line_termination)
2573 path = quote_one(p->two->path);
2574 printf("%s%c", path, opt->line_termination);
2575 if (p->two->path != path)
2576 free(path);
2577 }
2578
2579 int diff_unmodified_pair(struct diff_filepair *p)
2580 {
2581 /* This function is written stricter than necessary to support
2582 * the currently implemented transformers, but the idea is to
2583 * let transformers to produce diff_filepairs any way they want,
2584 * and filter and clean them up here before producing the output.
2585 */
2586 struct diff_filespec *one, *two;
2587
2588 if (DIFF_PAIR_UNMERGED(p))
2589 return 0; /* unmerged is interesting */
2590
2591 one = p->one;
2592 two = p->two;
2593
2594 /* deletion, addition, mode or type change
2595 * and rename are all interesting.
2596 */
2597 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2598 DIFF_PAIR_MODE_CHANGED(p) ||
2599 strcmp(one->path, two->path))
2600 return 0;
2601
2602 /* both are valid and point at the same path. that is, we are
2603 * dealing with a change.
2604 */
2605 if (one->sha1_valid && two->sha1_valid &&
2606 !hashcmp(one->sha1, two->sha1))
2607 return 1; /* no change */
2608 if (!one->sha1_valid && !two->sha1_valid)
2609 return 1; /* both look at the same file on the filesystem. */
2610 return 0;
2611 }
2612
2613 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2614 {
2615 if (diff_unmodified_pair(p))
2616 return;
2617
2618 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2619 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2620 return; /* no tree diffs in patch format */
2621
2622 run_diff(p, o);
2623 }
2624
2625 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2626 struct diffstat_t *diffstat)
2627 {
2628 if (diff_unmodified_pair(p))
2629 return;
2630
2631 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2632 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2633 return; /* no tree diffs in patch format */
2634
2635 run_diffstat(p, o, diffstat);
2636 }
2637
2638 static void diff_flush_checkdiff(struct diff_filepair *p,
2639 struct diff_options *o)
2640 {
2641 if (diff_unmodified_pair(p))
2642 return;
2643
2644 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2645 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2646 return; /* no tree diffs in patch format */
2647
2648 run_checkdiff(p, o);
2649 }
2650
2651 int diff_queue_is_empty(void)
2652 {
2653 struct diff_queue_struct *q = &diff_queued_diff;
2654 int i;
2655 for (i = 0; i < q->nr; i++)
2656 if (!diff_unmodified_pair(q->queue[i]))
2657 return 0;
2658 return 1;
2659 }
2660
2661 #if DIFF_DEBUG
2662 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2663 {
2664 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2665 x, one ? one : "",
2666 s->path,
2667 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2668 s->mode,
2669 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2670 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2671 x, one ? one : "",
2672 s->size, s->xfrm_flags);
2673 }
2674
2675 void diff_debug_filepair(const struct diff_filepair *p, int i)
2676 {
2677 diff_debug_filespec(p->one, i, "one");
2678 diff_debug_filespec(p->two, i, "two");
2679 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2680 p->score, p->status ? p->status : '?',
2681 p->source_stays, p->broken_pair);
2682 }
2683
2684 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2685 {
2686 int i;
2687 if (msg)
2688 fprintf(stderr, "%s\n", msg);
2689 fprintf(stderr, "q->nr = %d\n", q->nr);
2690 for (i = 0; i < q->nr; i++) {
2691 struct diff_filepair *p = q->queue[i];
2692 diff_debug_filepair(p, i);
2693 }
2694 }
2695 #endif
2696
2697 static void diff_resolve_rename_copy(void)
2698 {
2699 int i, j;
2700 struct diff_filepair *p, *pp;
2701 struct diff_queue_struct *q = &diff_queued_diff;
2702
2703 diff_debug_queue("resolve-rename-copy", q);
2704
2705 for (i = 0; i < q->nr; i++) {
2706 p = q->queue[i];
2707 p->status = 0; /* undecided */
2708 if (DIFF_PAIR_UNMERGED(p))
2709 p->status = DIFF_STATUS_UNMERGED;
2710 else if (!DIFF_FILE_VALID(p->one))
2711 p->status = DIFF_STATUS_ADDED;
2712 else if (!DIFF_FILE_VALID(p->two))
2713 p->status = DIFF_STATUS_DELETED;
2714 else if (DIFF_PAIR_TYPE_CHANGED(p))
2715 p->status = DIFF_STATUS_TYPE_CHANGED;
2716
2717 /* from this point on, we are dealing with a pair
2718 * whose both sides are valid and of the same type, i.e.
2719 * either in-place edit or rename/copy edit.
2720 */
2721 else if (DIFF_PAIR_RENAME(p)) {
2722 if (p->source_stays) {
2723 p->status = DIFF_STATUS_COPIED;
2724 continue;
2725 }
2726 /* See if there is some other filepair that
2727 * copies from the same source as us. If so
2728 * we are a copy. Otherwise we are either a
2729 * copy if the path stays, or a rename if it
2730 * does not, but we already handled "stays" case.
2731 */
2732 for (j = i + 1; j < q->nr; j++) {
2733 pp = q->queue[j];
2734 if (strcmp(pp->one->path, p->one->path))
2735 continue; /* not us */
2736 if (!DIFF_PAIR_RENAME(pp))
2737 continue; /* not a rename/copy */
2738 /* pp is a rename/copy from the same source */
2739 p->status = DIFF_STATUS_COPIED;
2740 break;
2741 }
2742 if (!p->status)
2743 p->status = DIFF_STATUS_RENAMED;
2744 }
2745 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2746 p->one->mode != p->two->mode ||
2747 is_null_sha1(p->one->sha1))
2748 p->status = DIFF_STATUS_MODIFIED;
2749 else {
2750 /* This is a "no-change" entry and should not
2751 * happen anymore, but prepare for broken callers.
2752 */
2753 error("feeding unmodified %s to diffcore",
2754 p->one->path);
2755 p->status = DIFF_STATUS_UNKNOWN;
2756 }
2757 }
2758 diff_debug_queue("resolve-rename-copy done", q);
2759 }
2760
2761 static int check_pair_status(struct diff_filepair *p)
2762 {
2763 switch (p->status) {
2764 case DIFF_STATUS_UNKNOWN:
2765 return 0;
2766 case 0:
2767 die("internal error in diff-resolve-rename-copy");
2768 default:
2769 return 1;
2770 }
2771 }
2772
2773 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2774 {
2775 int fmt = opt->output_format;
2776
2777 if (fmt & DIFF_FORMAT_CHECKDIFF)
2778 diff_flush_checkdiff(p, opt);
2779 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2780 diff_flush_raw(p, opt);
2781 else if (fmt & DIFF_FORMAT_NAME)
2782 diff_flush_name(p, opt);
2783 }
2784
2785 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2786 {
2787 char *name = quote_one(fs->path);
2788 if (fs->mode)
2789 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
2790 else
2791 printf(" %s %s\n", newdelete, name);
2792 free(name);
2793 }
2794
2795
2796 static void show_mode_change(struct diff_filepair *p, int show_name)
2797 {
2798 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2799 if (show_name) {
2800 char *name = quote_one(p->two->path);
2801 printf(" mode change %06o => %06o %s\n",
2802 p->one->mode, p->two->mode, name);
2803 free(name);
2804 }
2805 else
2806 printf(" mode change %06o => %06o\n",
2807 p->one->mode, p->two->mode);
2808 }
2809 }
2810
2811 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2812 {
2813 char *names = pprint_rename(p->one->path, p->two->path);
2814
2815 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2816 free(names);
2817 show_mode_change(p, 0);
2818 }
2819
2820 static void diff_summary(struct diff_filepair *p)
2821 {
2822 switch(p->status) {
2823 case DIFF_STATUS_DELETED:
2824 show_file_mode_name("delete", p->one);
2825 break;
2826 case DIFF_STATUS_ADDED:
2827 show_file_mode_name("create", p->two);
2828 break;
2829 case DIFF_STATUS_COPIED:
2830 show_rename_copy("copy", p);
2831 break;
2832 case DIFF_STATUS_RENAMED:
2833 show_rename_copy("rename", p);
2834 break;
2835 default:
2836 if (p->score) {
2837 char *name = quote_one(p->two->path);
2838 printf(" rewrite %s (%d%%)\n", name,
2839 similarity_index(p));
2840 free(name);
2841 show_mode_change(p, 0);
2842 } else show_mode_change(p, 1);
2843 break;
2844 }
2845 }
2846
2847 struct patch_id_t {
2848 struct xdiff_emit_state xm;
2849 SHA_CTX *ctx;
2850 int patchlen;
2851 };
2852
2853 static int remove_space(char *line, int len)
2854 {
2855 int i;
2856 char *dst = line;
2857 unsigned char c;
2858
2859 for (i = 0; i < len; i++)
2860 if (!isspace((c = line[i])))
2861 *dst++ = c;
2862
2863 return dst - line;
2864 }
2865
2866 static void patch_id_consume(void *priv, char *line, unsigned long len)
2867 {
2868 struct patch_id_t *data = priv;
2869 int new_len;
2870
2871 /* Ignore line numbers when computing the SHA1 of the patch */
2872 if (!prefixcmp(line, "@@ -"))
2873 return;
2874
2875 new_len = remove_space(line, len);
2876
2877 SHA1_Update(data->ctx, line, new_len);
2878 data->patchlen += new_len;
2879 }
2880
2881 /* returns 0 upon success, and writes result into sha1 */
2882 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2883 {
2884 struct diff_queue_struct *q = &diff_queued_diff;
2885 int i;
2886 SHA_CTX ctx;
2887 struct patch_id_t data;
2888 char buffer[PATH_MAX * 4 + 20];
2889
2890 SHA1_Init(&ctx);
2891 memset(&data, 0, sizeof(struct patch_id_t));
2892 data.ctx = &ctx;
2893 data.xm.consume = patch_id_consume;
2894
2895 for (i = 0; i < q->nr; i++) {
2896 xpparam_t xpp;
2897 xdemitconf_t xecfg;
2898 xdemitcb_t ecb;
2899 mmfile_t mf1, mf2;
2900 struct diff_filepair *p = q->queue[i];
2901 int len1, len2;
2902
2903 memset(&xecfg, 0, sizeof(xecfg));
2904 if (p->status == 0)
2905 return error("internal diff status error");
2906 if (p->status == DIFF_STATUS_UNKNOWN)
2907 continue;
2908 if (diff_unmodified_pair(p))
2909 continue;
2910 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2911 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2912 continue;
2913 if (DIFF_PAIR_UNMERGED(p))
2914 continue;
2915
2916 diff_fill_sha1_info(p->one);
2917 diff_fill_sha1_info(p->two);
2918 if (fill_mmfile(&mf1, p->one) < 0 ||
2919 fill_mmfile(&mf2, p->two) < 0)
2920 return error("unable to read files to diff");
2921
2922 len1 = remove_space(p->one->path, strlen(p->one->path));
2923 len2 = remove_space(p->two->path, strlen(p->two->path));
2924 if (p->one->mode == 0)
2925 len1 = snprintf(buffer, sizeof(buffer),
2926 "diff--gita/%.*sb/%.*s"
2927 "newfilemode%06o"
2928 "---/dev/null"
2929 "+++b/%.*s",
2930 len1, p->one->path,
2931 len2, p->two->path,
2932 p->two->mode,
2933 len2, p->two->path);
2934 else if (p->two->mode == 0)
2935 len1 = snprintf(buffer, sizeof(buffer),
2936 "diff--gita/%.*sb/%.*s"
2937 "deletedfilemode%06o"
2938 "---a/%.*s"
2939 "+++/dev/null",
2940 len1, p->one->path,
2941 len2, p->two->path,
2942 p->one->mode,
2943 len1, p->one->path);
2944 else
2945 len1 = snprintf(buffer, sizeof(buffer),
2946 "diff--gita/%.*sb/%.*s"
2947 "---a/%.*s"
2948 "+++b/%.*s",
2949 len1, p->one->path,
2950 len2, p->two->path,
2951 len1, p->one->path,
2952 len2, p->two->path);
2953 SHA1_Update(&ctx, buffer, len1);
2954
2955 xpp.flags = XDF_NEED_MINIMAL;
2956 xecfg.ctxlen = 3;
2957 xecfg.flags = XDL_EMIT_FUNCNAMES;
2958 ecb.outf = xdiff_outf;
2959 ecb.priv = &data;
2960 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2961 }
2962
2963 SHA1_Final(sha1, &ctx);
2964 return 0;
2965 }
2966
2967 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2968 {
2969 struct diff_queue_struct *q = &diff_queued_diff;
2970 int i;
2971 int result = diff_get_patch_id(options, sha1);
2972
2973 for (i = 0; i < q->nr; i++)
2974 diff_free_filepair(q->queue[i]);
2975
2976 free(q->queue);
2977 q->queue = NULL;
2978 q->nr = q->alloc = 0;
2979
2980 return result;
2981 }
2982
2983 static int is_summary_empty(const struct diff_queue_struct *q)
2984 {
2985 int i;
2986
2987 for (i = 0; i < q->nr; i++) {
2988 const struct diff_filepair *p = q->queue[i];
2989
2990 switch (p->status) {
2991 case DIFF_STATUS_DELETED:
2992 case DIFF_STATUS_ADDED:
2993 case DIFF_STATUS_COPIED:
2994 case DIFF_STATUS_RENAMED:
2995 return 0;
2996 default:
2997 if (p->score)
2998 return 0;
2999 if (p->one->mode && p->two->mode &&
3000 p->one->mode != p->two->mode)
3001 return 0;
3002 break;
3003 }
3004 }
3005 return 1;
3006 }
3007
3008 void diff_flush(struct diff_options *options)
3009 {
3010 struct diff_queue_struct *q = &diff_queued_diff;
3011 int i, output_format = options->output_format;
3012 int separator = 0;
3013
3014 /*
3015 * Order: raw, stat, summary, patch
3016 * or: name/name-status/checkdiff (other bits clear)
3017 */
3018 if (!q->nr)
3019 goto free_queue;
3020
3021 if (output_format & (DIFF_FORMAT_RAW |
3022 DIFF_FORMAT_NAME |
3023 DIFF_FORMAT_NAME_STATUS |
3024 DIFF_FORMAT_CHECKDIFF)) {
3025 for (i = 0; i < q->nr; i++) {
3026 struct diff_filepair *p = q->queue[i];
3027 if (check_pair_status(p))
3028 flush_one_pair(p, options);
3029 }
3030 separator++;
3031 }
3032
3033 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3034 struct diffstat_t diffstat;
3035
3036 memset(&diffstat, 0, sizeof(struct diffstat_t));
3037 diffstat.xm.consume = diffstat_consume;
3038 for (i = 0; i < q->nr; i++) {
3039 struct diff_filepair *p = q->queue[i];
3040 if (check_pair_status(p))
3041 diff_flush_stat(p, options, &diffstat);
3042 }
3043 if (output_format & DIFF_FORMAT_NUMSTAT)
3044 show_numstat(&diffstat, options);
3045 if (output_format & DIFF_FORMAT_DIFFSTAT)
3046 show_stats(&diffstat, options);
3047 else if (output_format & DIFF_FORMAT_SHORTSTAT)
3048 show_shortstats(&diffstat);
3049 separator++;
3050 }
3051
3052 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3053 for (i = 0; i < q->nr; i++)
3054 diff_summary(q->queue[i]);
3055 separator++;
3056 }
3057
3058 if (output_format & DIFF_FORMAT_PATCH) {
3059 if (separator) {
3060 if (options->stat_sep) {
3061 /* attach patch instead of inline */
3062 fputs(options->stat_sep, stdout);
3063 } else {
3064 putchar(options->line_termination);
3065 }
3066 }
3067
3068 for (i = 0; i < q->nr; i++) {
3069 struct diff_filepair *p = q->queue[i];
3070 if (check_pair_status(p))
3071 diff_flush_patch(p, options);
3072 }
3073 }
3074
3075 if (output_format & DIFF_FORMAT_CALLBACK)
3076 options->format_callback(q, options, options->format_callback_data);
3077
3078 for (i = 0; i < q->nr; i++)
3079 diff_free_filepair(q->queue[i]);
3080 free_queue:
3081 free(q->queue);
3082 q->queue = NULL;
3083 q->nr = q->alloc = 0;
3084 }
3085
3086 static void diffcore_apply_filter(const char *filter)
3087 {
3088 int i;
3089 struct diff_queue_struct *q = &diff_queued_diff;
3090 struct diff_queue_struct outq;
3091 outq.queue = NULL;
3092 outq.nr = outq.alloc = 0;
3093
3094 if (!filter)
3095 return;
3096
3097 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3098 int found;
3099 for (i = found = 0; !found && i < q->nr; i++) {
3100 struct diff_filepair *p = q->queue[i];
3101 if (((p->status == DIFF_STATUS_MODIFIED) &&
3102 ((p->score &&
3103 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3104 (!p->score &&
3105 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3106 ((p->status != DIFF_STATUS_MODIFIED) &&
3107 strchr(filter, p->status)))
3108 found++;
3109 }
3110 if (found)
3111 return;
3112
3113 /* otherwise we will clear the whole queue
3114 * by copying the empty outq at the end of this
3115 * function, but first clear the current entries
3116 * in the queue.
3117 */
3118 for (i = 0; i < q->nr; i++)
3119 diff_free_filepair(q->queue[i]);
3120 }
3121 else {
3122 /* Only the matching ones */
3123 for (i = 0; i < q->nr; i++) {
3124 struct diff_filepair *p = q->queue[i];
3125
3126 if (((p->status == DIFF_STATUS_MODIFIED) &&
3127 ((p->score &&
3128 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3129 (!p->score &&
3130 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3131 ((p->status != DIFF_STATUS_MODIFIED) &&
3132 strchr(filter, p->status)))
3133 diff_q(&outq, p);
3134 else
3135 diff_free_filepair(p);
3136 }
3137 }
3138 free(q->queue);
3139 *q = outq;
3140 }
3141
3142 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3143 {
3144 int i;
3145 struct diff_queue_struct *q = &diff_queued_diff;
3146 struct diff_queue_struct outq;
3147 outq.queue = NULL;
3148 outq.nr = outq.alloc = 0;
3149
3150 for (i = 0; i < q->nr; i++) {
3151 struct diff_filepair *p = q->queue[i];
3152
3153 /*
3154 * 1. Entries that come from stat info dirtyness
3155 * always have both sides (iow, not create/delete),
3156 * one side of the object name is unknown, with
3157 * the same mode and size. Keep the ones that
3158 * do not match these criteria. They have real
3159 * differences.
3160 *
3161 * 2. At this point, the file is known to be modified,
3162 * with the same mode and size, and the object
3163 * name of one side is unknown. Need to inspect
3164 * the identical contents.
3165 */
3166 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3167 !DIFF_FILE_VALID(p->two) ||
3168 (p->one->sha1_valid && p->two->sha1_valid) ||
3169 (p->one->mode != p->two->mode) ||
3170 diff_populate_filespec(p->one, 1) ||
3171 diff_populate_filespec(p->two, 1) ||
3172 (p->one->size != p->two->size) ||
3173
3174 diff_populate_filespec(p->one, 0) || /* (2) */
3175 diff_populate_filespec(p->two, 0) ||
3176 memcmp(p->one->data, p->two->data, p->one->size))
3177 diff_q(&outq, p);
3178 else {
3179 /*
3180 * The caller can subtract 1 from skip_stat_unmatch
3181 * to determine how many paths were dirty only
3182 * due to stat info mismatch.
3183 */
3184 if (!diffopt->no_index)
3185 diffopt->skip_stat_unmatch++;
3186 diff_free_filepair(p);
3187 }
3188 }
3189 free(q->queue);
3190 *q = outq;
3191 }
3192
3193 void diffcore_std(struct diff_options *options)
3194 {
3195 if (options->quiet)
3196 return;
3197
3198 if (options->skip_stat_unmatch && !options->find_copies_harder)
3199 diffcore_skip_stat_unmatch(options);
3200 if (options->break_opt != -1)
3201 diffcore_break(options->break_opt);
3202 if (options->detect_rename)
3203 diffcore_rename(options);
3204 if (options->break_opt != -1)
3205 diffcore_merge_broken();
3206 if (options->pickaxe)
3207 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3208 if (options->orderfile)
3209 diffcore_order(options->orderfile);
3210 diff_resolve_rename_copy();
3211 diffcore_apply_filter(options->filter);
3212
3213 options->has_changes = !!diff_queued_diff.nr;
3214 }
3215
3216
3217 void diff_addremove(struct diff_options *options,
3218 int addremove, unsigned mode,
3219 const unsigned char *sha1,
3220 const char *base, const char *path)
3221 {
3222 char concatpath[PATH_MAX];
3223 struct diff_filespec *one, *two;
3224
3225 /* This may look odd, but it is a preparation for
3226 * feeding "there are unchanged files which should
3227 * not produce diffs, but when you are doing copy
3228 * detection you would need them, so here they are"
3229 * entries to the diff-core. They will be prefixed
3230 * with something like '=' or '*' (I haven't decided
3231 * which but should not make any difference).
3232 * Feeding the same new and old to diff_change()
3233 * also has the same effect.
3234 * Before the final output happens, they are pruned after
3235 * merged into rename/copy pairs as appropriate.
3236 */
3237 if (options->reverse_diff)
3238 addremove = (addremove == '+' ? '-' :
3239 addremove == '-' ? '+' : addremove);
3240
3241 if (!path) path = "";
3242 sprintf(concatpath, "%s%s", base, path);
3243 one = alloc_filespec(concatpath);
3244 two = alloc_filespec(concatpath);
3245
3246 if (addremove != '+')
3247 fill_filespec(one, sha1, mode);
3248 if (addremove != '-')
3249 fill_filespec(two, sha1, mode);
3250
3251 diff_queue(&diff_queued_diff, one, two);
3252 options->has_changes = 1;
3253 }
3254
3255 void diff_change(struct diff_options *options,
3256 unsigned old_mode, unsigned new_mode,
3257 const unsigned char *old_sha1,
3258 const unsigned char *new_sha1,
3259 const char *base, const char *path)
3260 {
3261 char concatpath[PATH_MAX];
3262 struct diff_filespec *one, *two;
3263
3264 if (options->reverse_diff) {
3265 unsigned tmp;
3266 const unsigned char *tmp_c;
3267 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3268 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3269 }
3270 if (!path) path = "";
3271 sprintf(concatpath, "%s%s", base, path);
3272 one = alloc_filespec(concatpath);
3273 two = alloc_filespec(concatpath);
3274 fill_filespec(one, old_sha1, old_mode);
3275 fill_filespec(two, new_sha1, new_mode);
3276
3277 diff_queue(&diff_queued_diff, one, two);
3278 options->has_changes = 1;
3279 }
3280
3281 void diff_unmerge(struct diff_options *options,
3282 const char *path,
3283 unsigned mode, const unsigned char *sha1)
3284 {
3285 struct diff_filespec *one, *two;
3286 one = alloc_filespec(path);
3287 two = alloc_filespec(path);
3288 fill_filespec(one, sha1, mode);
3289 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3290 }
Git windows helper(/mini-wrapper) lib