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1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
15 #ifdef NO_FAST_WORKING_DIRECTORY
16 #define FAST_WORKING_DIRECTORY 0
17 #else
18 #define FAST_WORKING_DIRECTORY 1
19 #endif
21 static int diff_detect_rename_default;
22 static int diff_rename_limit_default = 200;
23 int diff_use_color_default = -1;
24 static const char *external_diff_cmd_cfg;
25 int diff_auto_refresh_index = 1;
27 static char diff_colors[][COLOR_MAXLEN] = {
28 "\033[m", /* reset */
29 "", /* PLAIN (normal) */
30 "\033[1m", /* METAINFO (bold) */
31 "\033[36m", /* FRAGINFO (cyan) */
32 "\033[31m", /* OLD (red) */
33 "\033[32m", /* NEW (green) */
34 "\033[33m", /* COMMIT (yellow) */
35 "\033[41m", /* WHITESPACE (red background) */
36 };
38 static int parse_diff_color_slot(const char *var, int ofs)
39 {
40 if (!strcasecmp(var+ofs, "plain"))
41 return DIFF_PLAIN;
42 if (!strcasecmp(var+ofs, "meta"))
43 return DIFF_METAINFO;
44 if (!strcasecmp(var+ofs, "frag"))
45 return DIFF_FRAGINFO;
46 if (!strcasecmp(var+ofs, "old"))
47 return DIFF_FILE_OLD;
48 if (!strcasecmp(var+ofs, "new"))
49 return DIFF_FILE_NEW;
50 if (!strcasecmp(var+ofs, "commit"))
51 return DIFF_COMMIT;
52 if (!strcasecmp(var+ofs, "whitespace"))
53 return DIFF_WHITESPACE;
54 die("bad config variable '%s'", var);
55 }
57 static struct ll_diff_driver {
58 const char *name;
59 struct ll_diff_driver *next;
60 const char *cmd;
61 } *user_diff, **user_diff_tail;
63 /*
64 * Currently there is only "diff.<drivername>.command" variable;
65 * because there are "diff.color.<slot>" variables, we are parsing
66 * this in a bit convoluted way to allow low level diff driver
67 * called "color".
68 */
69 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
70 {
71 const char *name;
72 int namelen;
73 struct ll_diff_driver *drv;
75 name = var + 5;
76 namelen = ep - name;
77 for (drv = user_diff; drv; drv = drv->next)
78 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
79 break;
80 if (!drv) {
81 drv = xcalloc(1, sizeof(struct ll_diff_driver));
82 drv->name = xmemdupz(name, namelen);
83 if (!user_diff_tail)
84 user_diff_tail = &user_diff;
85 *user_diff_tail = drv;
86 user_diff_tail = &(drv->next);
87 }
89 return git_config_string(&(drv->cmd), var, value);
90 }
92 /*
93 * 'diff.<what>.funcname' attribute can be specified in the configuration
94 * to define a customized regexp to find the beginning of a function to
95 * be used for hunk header lines of "diff -p" style output.
96 */
97 static struct funcname_pattern {
98 char *name;
99 char *pattern;
100 struct funcname_pattern *next;
101 } *funcname_pattern_list;
103 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
104 {
105 const char *name;
106 int namelen;
107 struct funcname_pattern *pp;
109 name = var + 5; /* "diff." */
110 namelen = ep - name;
112 for (pp = funcname_pattern_list; pp; pp = pp->next)
113 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
114 break;
115 if (!pp) {
116 pp = xcalloc(1, sizeof(*pp));
117 pp->name = xmemdupz(name, namelen);
118 pp->next = funcname_pattern_list;
119 funcname_pattern_list = pp;
120 }
121 free(pp->pattern);
122 pp->pattern = xstrdup(value);
123 return 0;
124 }
126 /*
127 * These are to give UI layer defaults.
128 * The core-level commands such as git-diff-files should
129 * never be affected by the setting of diff.renames
130 * the user happens to have in the configuration file.
131 */
132 int git_diff_ui_config(const char *var, const char *value, void *cb)
133 {
134 if (!strcmp(var, "diff.renamelimit")) {
135 diff_rename_limit_default = git_config_int(var, value);
136 return 0;
137 }
138 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
139 diff_use_color_default = git_config_colorbool(var, value, -1);
140 return 0;
141 }
142 if (!strcmp(var, "diff.renames")) {
143 if (!value)
144 diff_detect_rename_default = DIFF_DETECT_RENAME;
145 else if (!strcasecmp(value, "copies") ||
146 !strcasecmp(value, "copy"))
147 diff_detect_rename_default = DIFF_DETECT_COPY;
148 else if (git_config_bool(var,value))
149 diff_detect_rename_default = DIFF_DETECT_RENAME;
150 return 0;
151 }
152 if (!strcmp(var, "diff.autorefreshindex")) {
153 diff_auto_refresh_index = git_config_bool(var, value);
154 return 0;
155 }
156 if (!strcmp(var, "diff.external"))
157 return git_config_string(&external_diff_cmd_cfg, var, value);
158 if (!prefixcmp(var, "diff.")) {
159 const char *ep = strrchr(var, '.');
161 if (ep != var + 4 && !strcmp(ep, ".command"))
162 return parse_lldiff_command(var, ep, value);
163 }
165 return git_diff_basic_config(var, value, cb);
166 }
168 int git_diff_basic_config(const char *var, const char *value, void *cb)
169 {
170 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
171 int slot = parse_diff_color_slot(var, 11);
172 if (!value)
173 return config_error_nonbool(var);
174 color_parse(value, var, diff_colors[slot]);
175 return 0;
176 }
178 if (!prefixcmp(var, "diff.")) {
179 const char *ep = strrchr(var, '.');
180 if (ep != var + 4) {
181 if (!strcmp(ep, ".funcname")) {
182 if (!value)
183 return config_error_nonbool(var);
184 return parse_funcname_pattern(var, ep, value);
185 }
186 }
187 }
189 return git_color_default_config(var, value, cb);
190 }
192 static char *quote_two(const char *one, const char *two)
193 {
194 int need_one = quote_c_style(one, NULL, NULL, 1);
195 int need_two = quote_c_style(two, NULL, NULL, 1);
196 struct strbuf res;
198 strbuf_init(&res, 0);
199 if (need_one + need_two) {
200 strbuf_addch(&res, '"');
201 quote_c_style(one, &res, NULL, 1);
202 quote_c_style(two, &res, NULL, 1);
203 strbuf_addch(&res, '"');
204 } else {
205 strbuf_addstr(&res, one);
206 strbuf_addstr(&res, two);
207 }
208 return strbuf_detach(&res, NULL);
209 }
211 static const char *external_diff(void)
212 {
213 static const char *external_diff_cmd = NULL;
214 static int done_preparing = 0;
216 if (done_preparing)
217 return external_diff_cmd;
218 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
219 if (!external_diff_cmd)
220 external_diff_cmd = external_diff_cmd_cfg;
221 done_preparing = 1;
222 return external_diff_cmd;
223 }
225 static struct diff_tempfile {
226 const char *name; /* filename external diff should read from */
227 char hex[41];
228 char mode[10];
229 char tmp_path[PATH_MAX];
230 } diff_temp[2];
232 static int count_lines(const char *data, int size)
233 {
234 int count, ch, completely_empty = 1, nl_just_seen = 0;
235 count = 0;
236 while (0 < size--) {
237 ch = *data++;
238 if (ch == '\n') {
239 count++;
240 nl_just_seen = 1;
241 completely_empty = 0;
242 }
243 else {
244 nl_just_seen = 0;
245 completely_empty = 0;
246 }
247 }
248 if (completely_empty)
249 return 0;
250 if (!nl_just_seen)
251 count++; /* no trailing newline */
252 return count;
253 }
255 static void print_line_count(FILE *file, int count)
256 {
257 switch (count) {
258 case 0:
259 fprintf(file, "0,0");
260 break;
261 case 1:
262 fprintf(file, "1");
263 break;
264 default:
265 fprintf(file, "1,%d", count);
266 break;
267 }
268 }
270 static void copy_file_with_prefix(FILE *file,
271 int prefix, const char *data, int size,
272 const char *set, const char *reset)
273 {
274 int ch, nl_just_seen = 1;
275 while (0 < size--) {
276 ch = *data++;
277 if (nl_just_seen) {
278 fputs(set, file);
279 putc(prefix, file);
280 }
281 if (ch == '\n') {
282 nl_just_seen = 1;
283 fputs(reset, file);
284 } else
285 nl_just_seen = 0;
286 putc(ch, file);
287 }
288 if (!nl_just_seen)
289 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
290 }
292 static void emit_rewrite_diff(const char *name_a,
293 const char *name_b,
294 struct diff_filespec *one,
295 struct diff_filespec *two,
296 struct diff_options *o)
297 {
298 int lc_a, lc_b;
299 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
300 const char *name_a_tab, *name_b_tab;
301 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
302 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
303 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
304 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
305 const char *reset = diff_get_color(color_diff, DIFF_RESET);
306 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
308 name_a += (*name_a == '/');
309 name_b += (*name_b == '/');
310 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
311 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
313 strbuf_reset(&a_name);
314 strbuf_reset(&b_name);
315 quote_two_c_style(&a_name, o->a_prefix, name_a, 0);
316 quote_two_c_style(&b_name, o->b_prefix, name_b, 0);
318 diff_populate_filespec(one, 0);
319 diff_populate_filespec(two, 0);
320 lc_a = count_lines(one->data, one->size);
321 lc_b = count_lines(two->data, two->size);
322 fprintf(o->file,
323 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
324 metainfo, a_name.buf, name_a_tab, reset,
325 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
326 print_line_count(o->file, lc_a);
327 fprintf(o->file, " +");
328 print_line_count(o->file, lc_b);
329 fprintf(o->file, " @@%s\n", reset);
330 if (lc_a)
331 copy_file_with_prefix(o->file, '-', one->data, one->size, old, reset);
332 if (lc_b)
333 copy_file_with_prefix(o->file, '+', two->data, two->size, new, reset);
334 }
336 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
337 {
338 if (!DIFF_FILE_VALID(one)) {
339 mf->ptr = (char *)""; /* does not matter */
340 mf->size = 0;
341 return 0;
342 }
343 else if (diff_populate_filespec(one, 0))
344 return -1;
345 mf->ptr = one->data;
346 mf->size = one->size;
347 return 0;
348 }
350 struct diff_words_buffer {
351 mmfile_t text;
352 long alloc;
353 long current; /* output pointer */
354 int suppressed_newline;
355 };
357 static void diff_words_append(char *line, unsigned long len,
358 struct diff_words_buffer *buffer)
359 {
360 if (buffer->text.size + len > buffer->alloc) {
361 buffer->alloc = (buffer->text.size + len) * 3 / 2;
362 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
363 }
364 line++;
365 len--;
366 memcpy(buffer->text.ptr + buffer->text.size, line, len);
367 buffer->text.size += len;
368 }
370 struct diff_words_data {
371 struct xdiff_emit_state xm;
372 struct diff_words_buffer minus, plus;
373 FILE *file;
374 };
376 static void print_word(FILE *file, struct diff_words_buffer *buffer, int len, int color,
377 int suppress_newline)
378 {
379 const char *ptr;
380 int eol = 0;
382 if (len == 0)
383 return;
385 ptr = buffer->text.ptr + buffer->current;
386 buffer->current += len;
388 if (ptr[len - 1] == '\n') {
389 eol = 1;
390 len--;
391 }
393 fputs(diff_get_color(1, color), file);
394 fwrite(ptr, len, 1, file);
395 fputs(diff_get_color(1, DIFF_RESET), file);
397 if (eol) {
398 if (suppress_newline)
399 buffer->suppressed_newline = 1;
400 else
401 putc('\n', file);
402 }
403 }
405 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
406 {
407 struct diff_words_data *diff_words = priv;
409 if (diff_words->minus.suppressed_newline) {
410 if (line[0] != '+')
411 putc('\n', diff_words->file);
412 diff_words->minus.suppressed_newline = 0;
413 }
415 len--;
416 switch (line[0]) {
417 case '-':
418 print_word(diff_words->file,
419 &diff_words->minus, len, DIFF_FILE_OLD, 1);
420 break;
421 case '+':
422 print_word(diff_words->file,
423 &diff_words->plus, len, DIFF_FILE_NEW, 0);
424 break;
425 case ' ':
426 print_word(diff_words->file,
427 &diff_words->plus, len, DIFF_PLAIN, 0);
428 diff_words->minus.current += len;
429 break;
430 }
431 }
433 /* this executes the word diff on the accumulated buffers */
434 static void diff_words_show(struct diff_words_data *diff_words)
435 {
436 xpparam_t xpp;
437 xdemitconf_t xecfg;
438 xdemitcb_t ecb;
439 mmfile_t minus, plus;
440 int i;
442 memset(&xecfg, 0, sizeof(xecfg));
443 minus.size = diff_words->minus.text.size;
444 minus.ptr = xmalloc(minus.size);
445 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
446 for (i = 0; i < minus.size; i++)
447 if (isspace(minus.ptr[i]))
448 minus.ptr[i] = '\n';
449 diff_words->minus.current = 0;
451 plus.size = diff_words->plus.text.size;
452 plus.ptr = xmalloc(plus.size);
453 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
454 for (i = 0; i < plus.size; i++)
455 if (isspace(plus.ptr[i]))
456 plus.ptr[i] = '\n';
457 diff_words->plus.current = 0;
459 xpp.flags = XDF_NEED_MINIMAL;
460 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
461 ecb.outf = xdiff_outf;
462 ecb.priv = diff_words;
463 diff_words->xm.consume = fn_out_diff_words_aux;
464 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
466 free(minus.ptr);
467 free(plus.ptr);
468 diff_words->minus.text.size = diff_words->plus.text.size = 0;
470 if (diff_words->minus.suppressed_newline) {
471 putc('\n', diff_words->file);
472 diff_words->minus.suppressed_newline = 0;
473 }
474 }
476 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
478 struct emit_callback {
479 struct xdiff_emit_state xm;
480 int nparents, color_diff;
481 unsigned ws_rule;
482 sane_truncate_fn truncate;
483 const char **label_path;
484 struct diff_words_data *diff_words;
485 int *found_changesp;
486 FILE *file;
487 };
489 static void free_diff_words_data(struct emit_callback *ecbdata)
490 {
491 if (ecbdata->diff_words) {
492 /* flush buffers */
493 if (ecbdata->diff_words->minus.text.size ||
494 ecbdata->diff_words->plus.text.size)
495 diff_words_show(ecbdata->diff_words);
497 free (ecbdata->diff_words->minus.text.ptr);
498 free (ecbdata->diff_words->plus.text.ptr);
499 free(ecbdata->diff_words);
500 ecbdata->diff_words = NULL;
501 }
502 }
504 const char *diff_get_color(int diff_use_color, enum color_diff ix)
505 {
506 if (diff_use_color)
507 return diff_colors[ix];
508 return "";
509 }
511 static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
512 {
513 int has_trailing_newline = (len > 0 && line[len-1] == '\n');
514 if (has_trailing_newline)
515 len--;
517 fputs(set, file);
518 fwrite(line, len, 1, file);
519 fputs(reset, file);
520 if (has_trailing_newline)
521 fputc('\n', file);
522 }
524 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
525 {
526 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
527 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
529 if (!*ws)
530 emit_line(ecbdata->file, set, reset, line, len);
531 else {
532 /* Emit just the prefix, then the rest. */
533 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
534 (void)check_and_emit_line(line + ecbdata->nparents,
535 len - ecbdata->nparents, ecbdata->ws_rule,
536 ecbdata->file, set, reset, ws);
537 }
538 }
540 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
541 {
542 const char *cp;
543 unsigned long allot;
544 size_t l = len;
546 if (ecb->truncate)
547 return ecb->truncate(line, len);
548 cp = line;
549 allot = l;
550 while (0 < l) {
551 (void) utf8_width(&cp, &l);
552 if (!cp)
553 break; /* truncated in the middle? */
554 }
555 return allot - l;
556 }
558 static void fn_out_consume(void *priv, char *line, unsigned long len)
559 {
560 int i;
561 int color;
562 struct emit_callback *ecbdata = priv;
563 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
564 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
565 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
567 *(ecbdata->found_changesp) = 1;
569 if (ecbdata->label_path[0]) {
570 const char *name_a_tab, *name_b_tab;
572 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
573 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
575 fprintf(ecbdata->file, "%s--- %s%s%s\n",
576 meta, ecbdata->label_path[0], reset, name_a_tab);
577 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
578 meta, ecbdata->label_path[1], reset, name_b_tab);
579 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
580 }
582 /* This is not really necessary for now because
583 * this codepath only deals with two-way diffs.
584 */
585 for (i = 0; i < len && line[i] == '@'; i++)
586 ;
587 if (2 <= i && i < len && line[i] == ' ') {
588 ecbdata->nparents = i - 1;
589 len = sane_truncate_line(ecbdata, line, len);
590 emit_line(ecbdata->file,
591 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
592 reset, line, len);
593 if (line[len-1] != '\n')
594 putc('\n', ecbdata->file);
595 return;
596 }
598 if (len < ecbdata->nparents) {
599 emit_line(ecbdata->file, reset, reset, line, len);
600 return;
601 }
603 color = DIFF_PLAIN;
604 if (ecbdata->diff_words && ecbdata->nparents != 1)
605 /* fall back to normal diff */
606 free_diff_words_data(ecbdata);
607 if (ecbdata->diff_words) {
608 if (line[0] == '-') {
609 diff_words_append(line, len,
610 &ecbdata->diff_words->minus);
611 return;
612 } else if (line[0] == '+') {
613 diff_words_append(line, len,
614 &ecbdata->diff_words->plus);
615 return;
616 }
617 if (ecbdata->diff_words->minus.text.size ||
618 ecbdata->diff_words->plus.text.size)
619 diff_words_show(ecbdata->diff_words);
620 line++;
621 len--;
622 emit_line(ecbdata->file, plain, reset, line, len);
623 return;
624 }
625 for (i = 0; i < ecbdata->nparents && len; i++) {
626 if (line[i] == '-')
627 color = DIFF_FILE_OLD;
628 else if (line[i] == '+')
629 color = DIFF_FILE_NEW;
630 }
632 if (color != DIFF_FILE_NEW) {
633 emit_line(ecbdata->file,
634 diff_get_color(ecbdata->color_diff, color),
635 reset, line, len);
636 return;
637 }
638 emit_add_line(reset, ecbdata, line, len);
639 }
641 static char *pprint_rename(const char *a, const char *b)
642 {
643 const char *old = a;
644 const char *new = b;
645 struct strbuf name;
646 int pfx_length, sfx_length;
647 int len_a = strlen(a);
648 int len_b = strlen(b);
649 int a_midlen, b_midlen;
650 int qlen_a = quote_c_style(a, NULL, NULL, 0);
651 int qlen_b = quote_c_style(b, NULL, NULL, 0);
653 strbuf_init(&name, 0);
654 if (qlen_a || qlen_b) {
655 quote_c_style(a, &name, NULL, 0);
656 strbuf_addstr(&name, " => ");
657 quote_c_style(b, &name, NULL, 0);
658 return strbuf_detach(&name, NULL);
659 }
661 /* Find common prefix */
662 pfx_length = 0;
663 while (*old && *new && *old == *new) {
664 if (*old == '/')
665 pfx_length = old - a + 1;
666 old++;
667 new++;
668 }
670 /* Find common suffix */
671 old = a + len_a;
672 new = b + len_b;
673 sfx_length = 0;
674 while (a <= old && b <= new && *old == *new) {
675 if (*old == '/')
676 sfx_length = len_a - (old - a);
677 old--;
678 new--;
679 }
681 /*
682 * pfx{mid-a => mid-b}sfx
683 * {pfx-a => pfx-b}sfx
684 * pfx{sfx-a => sfx-b}
685 * name-a => name-b
686 */
687 a_midlen = len_a - pfx_length - sfx_length;
688 b_midlen = len_b - pfx_length - sfx_length;
689 if (a_midlen < 0)
690 a_midlen = 0;
691 if (b_midlen < 0)
692 b_midlen = 0;
694 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
695 if (pfx_length + sfx_length) {
696 strbuf_add(&name, a, pfx_length);
697 strbuf_addch(&name, '{');
698 }
699 strbuf_add(&name, a + pfx_length, a_midlen);
700 strbuf_addstr(&name, " => ");
701 strbuf_add(&name, b + pfx_length, b_midlen);
702 if (pfx_length + sfx_length) {
703 strbuf_addch(&name, '}');
704 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
705 }
706 return strbuf_detach(&name, NULL);
707 }
709 struct diffstat_t {
710 struct xdiff_emit_state xm;
712 int nr;
713 int alloc;
714 struct diffstat_file {
715 char *from_name;
716 char *name;
717 char *print_name;
718 unsigned is_unmerged:1;
719 unsigned is_binary:1;
720 unsigned is_renamed:1;
721 unsigned int added, deleted;
722 } **files;
723 };
725 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
726 const char *name_a,
727 const char *name_b)
728 {
729 struct diffstat_file *x;
730 x = xcalloc(sizeof (*x), 1);
731 if (diffstat->nr == diffstat->alloc) {
732 diffstat->alloc = alloc_nr(diffstat->alloc);
733 diffstat->files = xrealloc(diffstat->files,
734 diffstat->alloc * sizeof(x));
735 }
736 diffstat->files[diffstat->nr++] = x;
737 if (name_b) {
738 x->from_name = xstrdup(name_a);
739 x->name = xstrdup(name_b);
740 x->is_renamed = 1;
741 }
742 else {
743 x->from_name = NULL;
744 x->name = xstrdup(name_a);
745 }
746 return x;
747 }
749 static void diffstat_consume(void *priv, char *line, unsigned long len)
750 {
751 struct diffstat_t *diffstat = priv;
752 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
754 if (line[0] == '+')
755 x->added++;
756 else if (line[0] == '-')
757 x->deleted++;
758 }
760 const char mime_boundary_leader[] = "------------";
762 static int scale_linear(int it, int width, int max_change)
763 {
764 /*
765 * make sure that at least one '-' is printed if there were deletions,
766 * and likewise for '+'.
767 */
768 if (max_change < 2)
769 return it;
770 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
771 }
773 static void show_name(FILE *file,
774 const char *prefix, const char *name, int len,
775 const char *reset, const char *set)
776 {
777 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
778 }
780 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
781 {
782 if (cnt <= 0)
783 return;
784 fprintf(file, "%s", set);
785 while (cnt--)
786 putc(ch, file);
787 fprintf(file, "%s", reset);
788 }
790 static void fill_print_name(struct diffstat_file *file)
791 {
792 char *pname;
794 if (file->print_name)
795 return;
797 if (!file->is_renamed) {
798 struct strbuf buf;
799 strbuf_init(&buf, 0);
800 if (quote_c_style(file->name, &buf, NULL, 0)) {
801 pname = strbuf_detach(&buf, NULL);
802 } else {
803 pname = file->name;
804 strbuf_release(&buf);
805 }
806 } else {
807 pname = pprint_rename(file->from_name, file->name);
808 }
809 file->print_name = pname;
810 }
812 static void show_stats(struct diffstat_t* data, struct diff_options *options)
813 {
814 int i, len, add, del, total, adds = 0, dels = 0;
815 int max_change = 0, max_len = 0;
816 int total_files = data->nr;
817 int width, name_width;
818 const char *reset, *set, *add_c, *del_c;
820 if (data->nr == 0)
821 return;
823 width = options->stat_width ? options->stat_width : 80;
824 name_width = options->stat_name_width ? options->stat_name_width : 50;
826 /* Sanity: give at least 5 columns to the graph,
827 * but leave at least 10 columns for the name.
828 */
829 if (width < name_width + 15) {
830 if (name_width <= 25)
831 width = name_width + 15;
832 else
833 name_width = width - 15;
834 }
836 /* Find the longest filename and max number of changes */
837 reset = diff_get_color_opt(options, DIFF_RESET);
838 set = diff_get_color_opt(options, DIFF_PLAIN);
839 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
840 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
842 for (i = 0; i < data->nr; i++) {
843 struct diffstat_file *file = data->files[i];
844 int change = file->added + file->deleted;
845 fill_print_name(file);
846 len = strlen(file->print_name);
847 if (max_len < len)
848 max_len = len;
850 if (file->is_binary || file->is_unmerged)
851 continue;
852 if (max_change < change)
853 max_change = change;
854 }
856 /* Compute the width of the graph part;
857 * 10 is for one blank at the beginning of the line plus
858 * " | count " between the name and the graph.
859 *
860 * From here on, name_width is the width of the name area,
861 * and width is the width of the graph area.
862 */
863 name_width = (name_width < max_len) ? name_width : max_len;
864 if (width < (name_width + 10) + max_change)
865 width = width - (name_width + 10);
866 else
867 width = max_change;
869 for (i = 0; i < data->nr; i++) {
870 const char *prefix = "";
871 char *name = data->files[i]->print_name;
872 int added = data->files[i]->added;
873 int deleted = data->files[i]->deleted;
874 int name_len;
876 /*
877 * "scale" the filename
878 */
879 len = name_width;
880 name_len = strlen(name);
881 if (name_width < name_len) {
882 char *slash;
883 prefix = "...";
884 len -= 3;
885 name += name_len - len;
886 slash = strchr(name, '/');
887 if (slash)
888 name = slash;
889 }
891 if (data->files[i]->is_binary) {
892 show_name(options->file, prefix, name, len, reset, set);
893 fprintf(options->file, " Bin ");
894 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
895 fprintf(options->file, " -> ");
896 fprintf(options->file, "%s%d%s", add_c, added, reset);
897 fprintf(options->file, " bytes");
898 fprintf(options->file, "\n");
899 continue;
900 }
901 else if (data->files[i]->is_unmerged) {
902 show_name(options->file, prefix, name, len, reset, set);
903 fprintf(options->file, " Unmerged\n");
904 continue;
905 }
906 else if (!data->files[i]->is_renamed &&
907 (added + deleted == 0)) {
908 total_files--;
909 continue;
910 }
912 /*
913 * scale the add/delete
914 */
915 add = added;
916 del = deleted;
917 total = add + del;
918 adds += add;
919 dels += del;
921 if (width <= max_change) {
922 add = scale_linear(add, width, max_change);
923 del = scale_linear(del, width, max_change);
924 total = add + del;
925 }
926 show_name(options->file, prefix, name, len, reset, set);
927 fprintf(options->file, "%5d ", added + deleted);
928 show_graph(options->file, '+', add, add_c, reset);
929 show_graph(options->file, '-', del, del_c, reset);
930 fprintf(options->file, "\n");
931 }
932 fprintf(options->file,
933 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
934 set, total_files, adds, dels, reset);
935 }
937 static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
938 {
939 int i, adds = 0, dels = 0, total_files = data->nr;
941 if (data->nr == 0)
942 return;
944 for (i = 0; i < data->nr; i++) {
945 if (!data->files[i]->is_binary &&
946 !data->files[i]->is_unmerged) {
947 int added = data->files[i]->added;
948 int deleted= data->files[i]->deleted;
949 if (!data->files[i]->is_renamed &&
950 (added + deleted == 0)) {
951 total_files--;
952 } else {
953 adds += added;
954 dels += deleted;
955 }
956 }
957 }
958 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
959 total_files, adds, dels);
960 }
962 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
963 {
964 int i;
966 if (data->nr == 0)
967 return;
969 for (i = 0; i < data->nr; i++) {
970 struct diffstat_file *file = data->files[i];
972 if (file->is_binary)
973 fprintf(options->file, "-\t-\t");
974 else
975 fprintf(options->file,
976 "%d\t%d\t", file->added, file->deleted);
977 if (options->line_termination) {
978 fill_print_name(file);
979 if (!file->is_renamed)
980 write_name_quoted(file->name, options->file,
981 options->line_termination);
982 else {
983 fputs(file->print_name, options->file);
984 putc(options->line_termination, options->file);
985 }
986 } else {
987 if (file->is_renamed) {
988 putc('\0', options->file);
989 write_name_quoted(file->from_name, options->file, '\0');
990 }
991 write_name_quoted(file->name, options->file, '\0');
992 }
993 }
994 }
996 struct dirstat_file {
997 const char *name;
998 unsigned long changed;
999 };
1001 struct dirstat_dir {
1002 struct dirstat_file *files;
1003 int alloc, nr, percent, cumulative;
1004 };
1006 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1007 {
1008 unsigned long this_dir = 0;
1009 unsigned int sources = 0;
1011 while (dir->nr) {
1012 struct dirstat_file *f = dir->files;
1013 int namelen = strlen(f->name);
1014 unsigned long this;
1015 char *slash;
1017 if (namelen < baselen)
1018 break;
1019 if (memcmp(f->name, base, baselen))
1020 break;
1021 slash = strchr(f->name + baselen, '/');
1022 if (slash) {
1023 int newbaselen = slash + 1 - f->name;
1024 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1025 sources++;
1026 } else {
1027 this = f->changed;
1028 dir->files++;
1029 dir->nr--;
1030 sources += 2;
1031 }
1032 this_dir += this;
1033 }
1035 /*
1036 * We don't report dirstat's for
1037 * - the top level
1038 * - or cases where everything came from a single directory
1039 * under this directory (sources == 1).
1040 */
1041 if (baselen && sources != 1) {
1042 int permille = this_dir * 1000 / changed;
1043 if (permille) {
1044 int percent = permille / 10;
1045 if (percent >= dir->percent) {
1046 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1047 if (!dir->cumulative)
1048 return 0;
1049 }
1050 }
1051 }
1052 return this_dir;
1053 }
1055 static void show_dirstat(struct diff_options *options)
1056 {
1057 int i;
1058 unsigned long changed;
1059 struct dirstat_dir dir;
1060 struct diff_queue_struct *q = &diff_queued_diff;
1062 dir.files = NULL;
1063 dir.alloc = 0;
1064 dir.nr = 0;
1065 dir.percent = options->dirstat_percent;
1066 dir.cumulative = options->output_format & DIFF_FORMAT_CUMULATIVE;
1068 changed = 0;
1069 for (i = 0; i < q->nr; i++) {
1070 struct diff_filepair *p = q->queue[i];
1071 const char *name;
1072 unsigned long copied, added, damage;
1074 name = p->one->path ? p->one->path : p->two->path;
1076 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1077 diff_populate_filespec(p->one, 0);
1078 diff_populate_filespec(p->two, 0);
1079 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1080 &copied, &added);
1081 diff_free_filespec_data(p->one);
1082 diff_free_filespec_data(p->two);
1083 } else if (DIFF_FILE_VALID(p->one)) {
1084 diff_populate_filespec(p->one, 1);
1085 copied = added = 0;
1086 diff_free_filespec_data(p->one);
1087 } else if (DIFF_FILE_VALID(p->two)) {
1088 diff_populate_filespec(p->two, 1);
1089 copied = 0;
1090 added = p->two->size;
1091 diff_free_filespec_data(p->two);
1092 } else
1093 continue;
1095 /*
1096 * Original minus copied is the removed material,
1097 * added is the new material. They are both damages
1098 * made to the preimage.
1099 */
1100 damage = (p->one->size - copied) + added;
1102 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1103 dir.files[dir.nr].name = name;
1104 dir.files[dir.nr].changed = damage;
1105 changed += damage;
1106 dir.nr++;
1107 }
1109 /* This can happen even with many files, if everything was renames */
1110 if (!changed)
1111 return;
1113 /* Show all directories with more than x% of the changes */
1114 gather_dirstat(options->file, &dir, changed, "", 0);
1115 }
1117 static void free_diffstat_info(struct diffstat_t *diffstat)
1118 {
1119 int i;
1120 for (i = 0; i < diffstat->nr; i++) {
1121 struct diffstat_file *f = diffstat->files[i];
1122 if (f->name != f->print_name)
1123 free(f->print_name);
1124 free(f->name);
1125 free(f->from_name);
1126 free(f);
1127 }
1128 free(diffstat->files);
1129 }
1131 struct checkdiff_t {
1132 struct xdiff_emit_state xm;
1133 const char *filename;
1134 int lineno, color_diff;
1135 unsigned ws_rule;
1136 unsigned status;
1137 FILE *file;
1138 };
1140 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1141 {
1142 struct checkdiff_t *data = priv;
1143 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1144 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1145 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
1146 char *err;
1148 if (line[0] == '+') {
1149 unsigned bad;
1150 data->lineno++;
1151 bad = check_and_emit_line(line + 1, len - 1,
1152 data->ws_rule, NULL, NULL, NULL, NULL);
1153 if (!bad)
1154 return;
1155 data->status |= bad;
1156 err = whitespace_error_string(bad);
1157 fprintf(data->file, "%s:%d: %s.\n", data->filename, data->lineno, err);
1158 free(err);
1159 emit_line(data->file, set, reset, line, 1);
1160 (void)check_and_emit_line(line + 1, len - 1, data->ws_rule,
1161 data->file, set, reset, ws);
1162 } else if (line[0] == ' ')
1163 data->lineno++;
1164 else if (line[0] == '@') {
1165 char *plus = strchr(line, '+');
1166 if (plus)
1167 data->lineno = strtol(plus, NULL, 10) - 1;
1168 else
1169 die("invalid diff");
1170 }
1171 }
1173 static unsigned char *deflate_it(char *data,
1174 unsigned long size,
1175 unsigned long *result_size)
1176 {
1177 int bound;
1178 unsigned char *deflated;
1179 z_stream stream;
1181 memset(&stream, 0, sizeof(stream));
1182 deflateInit(&stream, zlib_compression_level);
1183 bound = deflateBound(&stream, size);
1184 deflated = xmalloc(bound);
1185 stream.next_out = deflated;
1186 stream.avail_out = bound;
1188 stream.next_in = (unsigned char *)data;
1189 stream.avail_in = size;
1190 while (deflate(&stream, Z_FINISH) == Z_OK)
1191 ; /* nothing */
1192 deflateEnd(&stream);
1193 *result_size = stream.total_out;
1194 return deflated;
1195 }
1197 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1198 {
1199 void *cp;
1200 void *delta;
1201 void *deflated;
1202 void *data;
1203 unsigned long orig_size;
1204 unsigned long delta_size;
1205 unsigned long deflate_size;
1206 unsigned long data_size;
1208 /* We could do deflated delta, or we could do just deflated two,
1209 * whichever is smaller.
1210 */
1211 delta = NULL;
1212 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1213 if (one->size && two->size) {
1214 delta = diff_delta(one->ptr, one->size,
1215 two->ptr, two->size,
1216 &delta_size, deflate_size);
1217 if (delta) {
1218 void *to_free = delta;
1219 orig_size = delta_size;
1220 delta = deflate_it(delta, delta_size, &delta_size);
1221 free(to_free);
1222 }
1223 }
1225 if (delta && delta_size < deflate_size) {
1226 fprintf(file, "delta %lu\n", orig_size);
1227 free(deflated);
1228 data = delta;
1229 data_size = delta_size;
1230 }
1231 else {
1232 fprintf(file, "literal %lu\n", two->size);
1233 free(delta);
1234 data = deflated;
1235 data_size = deflate_size;
1236 }
1238 /* emit data encoded in base85 */
1239 cp = data;
1240 while (data_size) {
1241 int bytes = (52 < data_size) ? 52 : data_size;
1242 char line[70];
1243 data_size -= bytes;
1244 if (bytes <= 26)
1245 line[0] = bytes + 'A' - 1;
1246 else
1247 line[0] = bytes - 26 + 'a' - 1;
1248 encode_85(line + 1, cp, bytes);
1249 cp = (char *) cp + bytes;
1250 fputs(line, file);
1251 fputc('\n', file);
1252 }
1253 fprintf(file, "\n");
1254 free(data);
1255 }
1257 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1258 {
1259 fprintf(file, "GIT binary patch\n");
1260 emit_binary_diff_body(file, one, two);
1261 emit_binary_diff_body(file, two, one);
1262 }
1264 static void setup_diff_attr_check(struct git_attr_check *check)
1265 {
1266 static struct git_attr *attr_diff;
1268 if (!attr_diff) {
1269 attr_diff = git_attr("diff", 4);
1270 }
1271 check[0].attr = attr_diff;
1272 }
1274 static void diff_filespec_check_attr(struct diff_filespec *one)
1275 {
1276 struct git_attr_check attr_diff_check;
1277 int check_from_data = 0;
1279 if (one->checked_attr)
1280 return;
1282 setup_diff_attr_check(&attr_diff_check);
1283 one->is_binary = 0;
1284 one->funcname_pattern_ident = NULL;
1286 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1287 const char *value;
1289 /* binaryness */
1290 value = attr_diff_check.value;
1291 if (ATTR_TRUE(value))
1292 ;
1293 else if (ATTR_FALSE(value))
1294 one->is_binary = 1;
1295 else
1296 check_from_data = 1;
1298 /* funcname pattern ident */
1299 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1300 ;
1301 else
1302 one->funcname_pattern_ident = value;
1303 }
1305 if (check_from_data) {
1306 if (!one->data && DIFF_FILE_VALID(one))
1307 diff_populate_filespec(one, 0);
1309 if (one->data)
1310 one->is_binary = buffer_is_binary(one->data, one->size);
1311 }
1312 }
1314 int diff_filespec_is_binary(struct diff_filespec *one)
1315 {
1316 diff_filespec_check_attr(one);
1317 return one->is_binary;
1318 }
1320 static const char *funcname_pattern(const char *ident)
1321 {
1322 struct funcname_pattern *pp;
1324 for (pp = funcname_pattern_list; pp; pp = pp->next)
1325 if (!strcmp(ident, pp->name))
1326 return pp->pattern;
1327 return NULL;
1328 }
1330 static struct builtin_funcname_pattern {
1331 const char *name;
1332 const char *pattern;
1333 } builtin_funcname_pattern[] = {
1334 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1335 "new\\|return\\|switch\\|throw\\|while\\)\n"
1336 "^[ ]*\\(\\([ ]*"
1337 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1338 "[ ]*([^;]*\\)$" },
1339 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1340 };
1342 static const char *diff_funcname_pattern(struct diff_filespec *one)
1343 {
1344 const char *ident, *pattern;
1345 int i;
1347 diff_filespec_check_attr(one);
1348 ident = one->funcname_pattern_ident;
1350 if (!ident)
1351 /*
1352 * If the config file has "funcname.default" defined, that
1353 * regexp is used; otherwise NULL is returned and xemit uses
1354 * the built-in default.
1355 */
1356 return funcname_pattern("default");
1358 /* Look up custom "funcname.$ident" regexp from config. */
1359 pattern = funcname_pattern(ident);
1360 if (pattern)
1361 return pattern;
1363 /*
1364 * And define built-in fallback patterns here. Note that
1365 * these can be overridden by the user's config settings.
1366 */
1367 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1368 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1369 return builtin_funcname_pattern[i].pattern;
1371 return NULL;
1372 }
1374 static void builtin_diff(const char *name_a,
1375 const char *name_b,
1376 struct diff_filespec *one,
1377 struct diff_filespec *two,
1378 const char *xfrm_msg,
1379 struct diff_options *o,
1380 int complete_rewrite)
1381 {
1382 mmfile_t mf1, mf2;
1383 const char *lbl[2];
1384 char *a_one, *b_two;
1385 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1386 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1388 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1389 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
1390 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1391 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1392 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1393 if (lbl[0][0] == '/') {
1394 /* /dev/null */
1395 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
1396 if (xfrm_msg && xfrm_msg[0])
1397 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1398 }
1399 else if (lbl[1][0] == '/') {
1400 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1401 if (xfrm_msg && xfrm_msg[0])
1402 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1403 }
1404 else {
1405 if (one->mode != two->mode) {
1406 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1407 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
1408 }
1409 if (xfrm_msg && xfrm_msg[0])
1410 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1411 /*
1412 * we do not run diff between different kind
1413 * of objects.
1414 */
1415 if ((one->mode ^ two->mode) & S_IFMT)
1416 goto free_ab_and_return;
1417 if (complete_rewrite) {
1418 emit_rewrite_diff(name_a, name_b, one, two, o);
1419 o->found_changes = 1;
1420 goto free_ab_and_return;
1421 }
1422 }
1424 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1425 die("unable to read files to diff");
1427 if (!DIFF_OPT_TST(o, TEXT) &&
1428 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1429 /* Quite common confusing case */
1430 if (mf1.size == mf2.size &&
1431 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1432 goto free_ab_and_return;
1433 if (DIFF_OPT_TST(o, BINARY))
1434 emit_binary_diff(o->file, &mf1, &mf2);
1435 else
1436 fprintf(o->file, "Binary files %s and %s differ\n",
1437 lbl[0], lbl[1]);
1438 o->found_changes = 1;
1439 }
1440 else {
1441 /* Crazy xdl interfaces.. */
1442 const char *diffopts = getenv("GIT_DIFF_OPTS");
1443 xpparam_t xpp;
1444 xdemitconf_t xecfg;
1445 xdemitcb_t ecb;
1446 struct emit_callback ecbdata;
1447 const char *funcname_pattern;
1449 funcname_pattern = diff_funcname_pattern(one);
1450 if (!funcname_pattern)
1451 funcname_pattern = diff_funcname_pattern(two);
1453 memset(&xecfg, 0, sizeof(xecfg));
1454 memset(&ecbdata, 0, sizeof(ecbdata));
1455 ecbdata.label_path = lbl;
1456 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1457 ecbdata.found_changesp = &o->found_changes;
1458 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1459 ecbdata.file = o->file;
1460 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1461 xecfg.ctxlen = o->context;
1462 xecfg.flags = XDL_EMIT_FUNCNAMES;
1463 if (funcname_pattern)
1464 xdiff_set_find_func(&xecfg, funcname_pattern);
1465 if (!diffopts)
1466 ;
1467 else if (!prefixcmp(diffopts, "--unified="))
1468 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1469 else if (!prefixcmp(diffopts, "-u"))
1470 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1471 ecb.outf = xdiff_outf;
1472 ecb.priv = &ecbdata;
1473 ecbdata.xm.consume = fn_out_consume;
1474 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1475 ecbdata.diff_words =
1476 xcalloc(1, sizeof(struct diff_words_data));
1477 ecbdata.diff_words->file = o->file;
1478 }
1479 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1480 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1481 free_diff_words_data(&ecbdata);
1482 }
1484 free_ab_and_return:
1485 diff_free_filespec_data(one);
1486 diff_free_filespec_data(two);
1487 free(a_one);
1488 free(b_two);
1489 return;
1490 }
1492 static void builtin_diffstat(const char *name_a, const char *name_b,
1493 struct diff_filespec *one,
1494 struct diff_filespec *two,
1495 struct diffstat_t *diffstat,
1496 struct diff_options *o,
1497 int complete_rewrite)
1498 {
1499 mmfile_t mf1, mf2;
1500 struct diffstat_file *data;
1502 data = diffstat_add(diffstat, name_a, name_b);
1504 if (!one || !two) {
1505 data->is_unmerged = 1;
1506 return;
1507 }
1508 if (complete_rewrite) {
1509 diff_populate_filespec(one, 0);
1510 diff_populate_filespec(two, 0);
1511 data->deleted = count_lines(one->data, one->size);
1512 data->added = count_lines(two->data, two->size);
1513 goto free_and_return;
1514 }
1515 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1516 die("unable to read files to diff");
1518 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1519 data->is_binary = 1;
1520 data->added = mf2.size;
1521 data->deleted = mf1.size;
1522 } else {
1523 /* Crazy xdl interfaces.. */
1524 xpparam_t xpp;
1525 xdemitconf_t xecfg;
1526 xdemitcb_t ecb;
1528 memset(&xecfg, 0, sizeof(xecfg));
1529 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1530 ecb.outf = xdiff_outf;
1531 ecb.priv = diffstat;
1532 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1533 }
1535 free_and_return:
1536 diff_free_filespec_data(one);
1537 diff_free_filespec_data(two);
1538 }
1540 static void builtin_checkdiff(const char *name_a, const char *name_b,
1541 const char *attr_path,
1542 struct diff_filespec *one,
1543 struct diff_filespec *two, struct diff_options *o)
1544 {
1545 mmfile_t mf1, mf2;
1546 struct checkdiff_t data;
1548 if (!two)
1549 return;
1551 memset(&data, 0, sizeof(data));
1552 data.xm.consume = checkdiff_consume;
1553 data.filename = name_b ? name_b : name_a;
1554 data.lineno = 0;
1555 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1556 data.ws_rule = whitespace_rule(attr_path);
1557 data.file = o->file;
1559 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1560 die("unable to read files to diff");
1562 if (diff_filespec_is_binary(two))
1563 goto free_and_return;
1564 else {
1565 /* Crazy xdl interfaces.. */
1566 xpparam_t xpp;
1567 xdemitconf_t xecfg;
1568 xdemitcb_t ecb;
1570 memset(&xecfg, 0, sizeof(xecfg));
1571 xpp.flags = XDF_NEED_MINIMAL;
1572 ecb.outf = xdiff_outf;
1573 ecb.priv = &data;
1574 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1575 }
1576 free_and_return:
1577 diff_free_filespec_data(one);
1578 diff_free_filespec_data(two);
1579 if (data.status)
1580 DIFF_OPT_SET(o, CHECK_FAILED);
1581 }
1583 struct diff_filespec *alloc_filespec(const char *path)
1584 {
1585 int namelen = strlen(path);
1586 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1588 memset(spec, 0, sizeof(*spec));
1589 spec->path = (char *)(spec + 1);
1590 memcpy(spec->path, path, namelen+1);
1591 spec->count = 1;
1592 return spec;
1593 }
1595 void free_filespec(struct diff_filespec *spec)
1596 {
1597 if (!--spec->count) {
1598 diff_free_filespec_data(spec);
1599 free(spec);
1600 }
1601 }
1603 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1604 unsigned short mode)
1605 {
1606 if (mode) {
1607 spec->mode = canon_mode(mode);
1608 hashcpy(spec->sha1, sha1);
1609 spec->sha1_valid = !is_null_sha1(sha1);
1610 }
1611 }
1613 /*
1614 * Given a name and sha1 pair, if the index tells us the file in
1615 * the work tree has that object contents, return true, so that
1616 * prepare_temp_file() does not have to inflate and extract.
1617 */
1618 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1619 {
1620 struct cache_entry *ce;
1621 struct stat st;
1622 int pos, len;
1624 /* We do not read the cache ourselves here, because the
1625 * benchmark with my previous version that always reads cache
1626 * shows that it makes things worse for diff-tree comparing
1627 * two linux-2.6 kernel trees in an already checked out work
1628 * tree. This is because most diff-tree comparisons deal with
1629 * only a small number of files, while reading the cache is
1630 * expensive for a large project, and its cost outweighs the
1631 * savings we get by not inflating the object to a temporary
1632 * file. Practically, this code only helps when we are used
1633 * by diff-cache --cached, which does read the cache before
1634 * calling us.
1635 */
1636 if (!active_cache)
1637 return 0;
1639 /* We want to avoid the working directory if our caller
1640 * doesn't need the data in a normal file, this system
1641 * is rather slow with its stat/open/mmap/close syscalls,
1642 * and the object is contained in a pack file. The pack
1643 * is probably already open and will be faster to obtain
1644 * the data through than the working directory. Loose
1645 * objects however would tend to be slower as they need
1646 * to be individually opened and inflated.
1647 */
1648 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1649 return 0;
1651 len = strlen(name);
1652 pos = cache_name_pos(name, len);
1653 if (pos < 0)
1654 return 0;
1655 ce = active_cache[pos];
1657 /*
1658 * This is not the sha1 we are looking for, or
1659 * unreusable because it is not a regular file.
1660 */
1661 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1662 return 0;
1664 /*
1665 * If ce matches the file in the work tree, we can reuse it.
1666 */
1667 if (ce_uptodate(ce) ||
1668 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1669 return 1;
1671 return 0;
1672 }
1674 static int populate_from_stdin(struct diff_filespec *s)
1675 {
1676 struct strbuf buf;
1677 size_t size = 0;
1679 strbuf_init(&buf, 0);
1680 if (strbuf_read(&buf, 0, 0) < 0)
1681 return error("error while reading from stdin %s",
1682 strerror(errno));
1684 s->should_munmap = 0;
1685 s->data = strbuf_detach(&buf, &size);
1686 s->size = size;
1687 s->should_free = 1;
1688 return 0;
1689 }
1691 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1692 {
1693 int len;
1694 char *data = xmalloc(100);
1695 len = snprintf(data, 100,
1696 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1697 s->data = data;
1698 s->size = len;
1699 s->should_free = 1;
1700 if (size_only) {
1701 s->data = NULL;
1702 free(data);
1703 }
1704 return 0;
1705 }
1707 /*
1708 * While doing rename detection and pickaxe operation, we may need to
1709 * grab the data for the blob (or file) for our own in-core comparison.
1710 * diff_filespec has data and size fields for this purpose.
1711 */
1712 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1713 {
1714 int err = 0;
1715 if (!DIFF_FILE_VALID(s))
1716 die("internal error: asking to populate invalid file.");
1717 if (S_ISDIR(s->mode))
1718 return -1;
1720 if (s->data)
1721 return 0;
1723 if (size_only && 0 < s->size)
1724 return 0;
1726 if (S_ISGITLINK(s->mode))
1727 return diff_populate_gitlink(s, size_only);
1729 if (!s->sha1_valid ||
1730 reuse_worktree_file(s->path, s->sha1, 0)) {
1731 struct strbuf buf;
1732 struct stat st;
1733 int fd;
1735 if (!strcmp(s->path, "-"))
1736 return populate_from_stdin(s);
1738 if (lstat(s->path, &st) < 0) {
1739 if (errno == ENOENT) {
1740 err_empty:
1741 err = -1;
1742 empty:
1743 s->data = (char *)"";
1744 s->size = 0;
1745 return err;
1746 }
1747 }
1748 s->size = xsize_t(st.st_size);
1749 if (!s->size)
1750 goto empty;
1751 if (size_only)
1752 return 0;
1753 if (S_ISLNK(st.st_mode)) {
1754 int ret;
1755 s->data = xmalloc(s->size);
1756 s->should_free = 1;
1757 ret = readlink(s->path, s->data, s->size);
1758 if (ret < 0) {
1759 free(s->data);
1760 goto err_empty;
1761 }
1762 return 0;
1763 }
1764 fd = open(s->path, O_RDONLY);
1765 if (fd < 0)
1766 goto err_empty;
1767 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1768 close(fd);
1769 s->should_munmap = 1;
1771 /*
1772 * Convert from working tree format to canonical git format
1773 */
1774 strbuf_init(&buf, 0);
1775 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
1776 size_t size = 0;
1777 munmap(s->data, s->size);
1778 s->should_munmap = 0;
1779 s->data = strbuf_detach(&buf, &size);
1780 s->size = size;
1781 s->should_free = 1;
1782 }
1783 }
1784 else {
1785 enum object_type type;
1786 if (size_only)
1787 type = sha1_object_info(s->sha1, &s->size);
1788 else {
1789 s->data = read_sha1_file(s->sha1, &type, &s->size);
1790 s->should_free = 1;
1791 }
1792 }
1793 return 0;
1794 }
1796 void diff_free_filespec_blob(struct diff_filespec *s)
1797 {
1798 if (s->should_free)
1799 free(s->data);
1800 else if (s->should_munmap)
1801 munmap(s->data, s->size);
1803 if (s->should_free || s->should_munmap) {
1804 s->should_free = s->should_munmap = 0;
1805 s->data = NULL;
1806 }
1807 }
1809 void diff_free_filespec_data(struct diff_filespec *s)
1810 {
1811 diff_free_filespec_blob(s);
1812 free(s->cnt_data);
1813 s->cnt_data = NULL;
1814 }
1816 static void prep_temp_blob(struct diff_tempfile *temp,
1817 void *blob,
1818 unsigned long size,
1819 const unsigned char *sha1,
1820 int mode)
1821 {
1822 int fd;
1824 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1825 if (fd < 0)
1826 die("unable to create temp-file: %s", strerror(errno));
1827 if (write_in_full(fd, blob, size) != size)
1828 die("unable to write temp-file");
1829 close(fd);
1830 temp->name = temp->tmp_path;
1831 strcpy(temp->hex, sha1_to_hex(sha1));
1832 temp->hex[40] = 0;
1833 sprintf(temp->mode, "%06o", mode);
1834 }
1836 static void prepare_temp_file(const char *name,
1837 struct diff_tempfile *temp,
1838 struct diff_filespec *one)
1839 {
1840 if (!DIFF_FILE_VALID(one)) {
1841 not_a_valid_file:
1842 /* A '-' entry produces this for file-2, and
1843 * a '+' entry produces this for file-1.
1844 */
1845 temp->name = "/dev/null";
1846 strcpy(temp->hex, ".");
1847 strcpy(temp->mode, ".");
1848 return;
1849 }
1851 if (!one->sha1_valid ||
1852 reuse_worktree_file(name, one->sha1, 1)) {
1853 struct stat st;
1854 if (lstat(name, &st) < 0) {
1855 if (errno == ENOENT)
1856 goto not_a_valid_file;
1857 die("stat(%s): %s", name, strerror(errno));
1858 }
1859 if (S_ISLNK(st.st_mode)) {
1860 int ret;
1861 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1862 size_t sz = xsize_t(st.st_size);
1863 if (sizeof(buf) <= st.st_size)
1864 die("symlink too long: %s", name);
1865 ret = readlink(name, buf, sz);
1866 if (ret < 0)
1867 die("readlink(%s)", name);
1868 prep_temp_blob(temp, buf, sz,
1869 (one->sha1_valid ?
1870 one->sha1 : null_sha1),
1871 (one->sha1_valid ?
1872 one->mode : S_IFLNK));
1873 }
1874 else {
1875 /* we can borrow from the file in the work tree */
1876 temp->name = name;
1877 if (!one->sha1_valid)
1878 strcpy(temp->hex, sha1_to_hex(null_sha1));
1879 else
1880 strcpy(temp->hex, sha1_to_hex(one->sha1));
1881 /* Even though we may sometimes borrow the
1882 * contents from the work tree, we always want
1883 * one->mode. mode is trustworthy even when
1884 * !(one->sha1_valid), as long as
1885 * DIFF_FILE_VALID(one).
1886 */
1887 sprintf(temp->mode, "%06o", one->mode);
1888 }
1889 return;
1890 }
1891 else {
1892 if (diff_populate_filespec(one, 0))
1893 die("cannot read data blob for %s", one->path);
1894 prep_temp_blob(temp, one->data, one->size,
1895 one->sha1, one->mode);
1896 }
1897 }
1899 static void remove_tempfile(void)
1900 {
1901 int i;
1903 for (i = 0; i < 2; i++)
1904 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1905 unlink(diff_temp[i].name);
1906 diff_temp[i].name = NULL;
1907 }
1908 }
1910 static void remove_tempfile_on_signal(int signo)
1911 {
1912 remove_tempfile();
1913 signal(SIGINT, SIG_DFL);
1914 raise(signo);
1915 }
1917 /* An external diff command takes:
1918 *
1919 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1920 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1921 *
1922 */
1923 static void run_external_diff(const char *pgm,
1924 const char *name,
1925 const char *other,
1926 struct diff_filespec *one,
1927 struct diff_filespec *two,
1928 const char *xfrm_msg,
1929 int complete_rewrite)
1930 {
1931 const char *spawn_arg[10];
1932 struct diff_tempfile *temp = diff_temp;
1933 int retval;
1934 static int atexit_asked = 0;
1935 const char *othername;
1936 const char **arg = &spawn_arg[0];
1938 othername = (other? other : name);
1939 if (one && two) {
1940 prepare_temp_file(name, &temp[0], one);
1941 prepare_temp_file(othername, &temp[1], two);
1942 if (! atexit_asked &&
1943 (temp[0].name == temp[0].tmp_path ||
1944 temp[1].name == temp[1].tmp_path)) {
1945 atexit_asked = 1;
1946 atexit(remove_tempfile);
1947 }
1948 signal(SIGINT, remove_tempfile_on_signal);
1949 }
1951 if (one && two) {
1952 *arg++ = pgm;
1953 *arg++ = name;
1954 *arg++ = temp[0].name;
1955 *arg++ = temp[0].hex;
1956 *arg++ = temp[0].mode;
1957 *arg++ = temp[1].name;
1958 *arg++ = temp[1].hex;
1959 *arg++ = temp[1].mode;
1960 if (other) {
1961 *arg++ = other;
1962 *arg++ = xfrm_msg;
1963 }
1964 } else {
1965 *arg++ = pgm;
1966 *arg++ = name;
1967 }
1968 *arg = NULL;
1969 fflush(NULL);
1970 retval = run_command_v_opt(spawn_arg, 0);
1971 remove_tempfile();
1972 if (retval) {
1973 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1974 exit(1);
1975 }
1976 }
1978 static const char *external_diff_attr(const char *name)
1979 {
1980 struct git_attr_check attr_diff_check;
1982 if (!name)
1983 return NULL;
1985 setup_diff_attr_check(&attr_diff_check);
1986 if (!git_checkattr(name, 1, &attr_diff_check)) {
1987 const char *value = attr_diff_check.value;
1988 if (!ATTR_TRUE(value) &&
1989 !ATTR_FALSE(value) &&
1990 !ATTR_UNSET(value)) {
1991 struct ll_diff_driver *drv;
1993 for (drv = user_diff; drv; drv = drv->next)
1994 if (!strcmp(drv->name, value))
1995 return drv->cmd;
1996 }
1997 }
1998 return NULL;
1999 }
2001 static void run_diff_cmd(const char *pgm,
2002 const char *name,
2003 const char *other,
2004 const char *attr_path,
2005 struct diff_filespec *one,
2006 struct diff_filespec *two,
2007 const char *xfrm_msg,
2008 struct diff_options *o,
2009 int complete_rewrite)
2010 {
2011 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2012 pgm = NULL;
2013 else {
2014 const char *cmd = external_diff_attr(attr_path);
2015 if (cmd)
2016 pgm = cmd;
2017 }
2019 if (pgm) {
2020 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2021 complete_rewrite);
2022 return;
2023 }
2024 if (one && two)
2025 builtin_diff(name, other ? other : name,
2026 one, two, xfrm_msg, o, complete_rewrite);
2027 else
2028 fprintf(o->file, "* Unmerged path %s\n", name);
2029 }
2031 static void diff_fill_sha1_info(struct diff_filespec *one)
2032 {
2033 if (DIFF_FILE_VALID(one)) {
2034 if (!one->sha1_valid) {
2035 struct stat st;
2036 if (!strcmp(one->path, "-")) {
2037 hashcpy(one->sha1, null_sha1);
2038 return;
2039 }
2040 if (lstat(one->path, &st) < 0)
2041 die("stat %s", one->path);
2042 if (index_path(one->sha1, one->path, &st, 0))
2043 die("cannot hash %s\n", one->path);
2044 }
2045 }
2046 else
2047 hashclr(one->sha1);
2048 }
2050 static int similarity_index(struct diff_filepair *p)
2051 {
2052 return p->score * 100 / MAX_SCORE;
2053 }
2055 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2056 {
2057 /* Strip the prefix but do not molest /dev/null and absolute paths */
2058 if (*namep && **namep != '/')
2059 *namep += prefix_length;
2060 if (*otherp && **otherp != '/')
2061 *otherp += prefix_length;
2062 }
2064 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2065 {
2066 const char *pgm = external_diff();
2067 struct strbuf msg;
2068 char *xfrm_msg;
2069 struct diff_filespec *one = p->one;
2070 struct diff_filespec *two = p->two;
2071 const char *name;
2072 const char *other;
2073 const char *attr_path;
2074 int complete_rewrite = 0;
2076 name = p->one->path;
2077 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2078 attr_path = name;
2079 if (o->prefix_length)
2080 strip_prefix(o->prefix_length, &name, &other);
2082 if (DIFF_PAIR_UNMERGED(p)) {
2083 run_diff_cmd(pgm, name, NULL, attr_path,
2084 NULL, NULL, NULL, o, 0);
2085 return;
2086 }
2088 diff_fill_sha1_info(one);
2089 diff_fill_sha1_info(two);
2091 strbuf_init(&msg, PATH_MAX * 2 + 300);
2092 switch (p->status) {
2093 case DIFF_STATUS_COPIED:
2094 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2095 strbuf_addstr(&msg, "\ncopy from ");
2096 quote_c_style(name, &msg, NULL, 0);
2097 strbuf_addstr(&msg, "\ncopy to ");
2098 quote_c_style(other, &msg, NULL, 0);
2099 strbuf_addch(&msg, '\n');
2100 break;
2101 case DIFF_STATUS_RENAMED:
2102 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2103 strbuf_addstr(&msg, "\nrename from ");
2104 quote_c_style(name, &msg, NULL, 0);
2105 strbuf_addstr(&msg, "\nrename to ");
2106 quote_c_style(other, &msg, NULL, 0);
2107 strbuf_addch(&msg, '\n');
2108 break;
2109 case DIFF_STATUS_MODIFIED:
2110 if (p->score) {
2111 strbuf_addf(&msg, "dissimilarity index %d%%\n",
2112 similarity_index(p));
2113 complete_rewrite = 1;
2114 break;
2115 }
2116 /* fallthru */
2117 default:
2118 /* nothing */
2119 ;
2120 }
2122 if (hashcmp(one->sha1, two->sha1)) {
2123 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2125 if (DIFF_OPT_TST(o, BINARY)) {
2126 mmfile_t mf;
2127 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2128 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2129 abbrev = 40;
2130 }
2131 strbuf_addf(&msg, "index %.*s..%.*s",
2132 abbrev, sha1_to_hex(one->sha1),
2133 abbrev, sha1_to_hex(two->sha1));
2134 if (one->mode == two->mode)
2135 strbuf_addf(&msg, " %06o", one->mode);
2136 strbuf_addch(&msg, '\n');
2137 }
2139 if (msg.len)
2140 strbuf_setlen(&msg, msg.len - 1);
2141 xfrm_msg = msg.len ? msg.buf : NULL;
2143 if (!pgm &&
2144 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2145 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2146 /* a filepair that changes between file and symlink
2147 * needs to be split into deletion and creation.
2148 */
2149 struct diff_filespec *null = alloc_filespec(two->path);
2150 run_diff_cmd(NULL, name, other, attr_path,
2151 one, null, xfrm_msg, o, 0);
2152 free(null);
2153 null = alloc_filespec(one->path);
2154 run_diff_cmd(NULL, name, other, attr_path,
2155 null, two, xfrm_msg, o, 0);
2156 free(null);
2157 }
2158 else
2159 run_diff_cmd(pgm, name, other, attr_path,
2160 one, two, xfrm_msg, o, complete_rewrite);
2162 strbuf_release(&msg);
2163 }
2165 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2166 struct diffstat_t *diffstat)
2167 {
2168 const char *name;
2169 const char *other;
2170 int complete_rewrite = 0;
2172 if (DIFF_PAIR_UNMERGED(p)) {
2173 /* unmerged */
2174 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2175 return;
2176 }
2178 name = p->one->path;
2179 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2181 if (o->prefix_length)
2182 strip_prefix(o->prefix_length, &name, &other);
2184 diff_fill_sha1_info(p->one);
2185 diff_fill_sha1_info(p->two);
2187 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2188 complete_rewrite = 1;
2189 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2190 }
2192 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2193 {
2194 const char *name;
2195 const char *other;
2196 const char *attr_path;
2198 if (DIFF_PAIR_UNMERGED(p)) {
2199 /* unmerged */
2200 return;
2201 }
2203 name = p->one->path;
2204 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2205 attr_path = other ? other : name;
2207 if (o->prefix_length)
2208 strip_prefix(o->prefix_length, &name, &other);
2210 diff_fill_sha1_info(p->one);
2211 diff_fill_sha1_info(p->two);
2213 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2214 }
2216 void diff_setup(struct diff_options *options)
2217 {
2218 memset(options, 0, sizeof(*options));
2220 options->file = stdout;
2222 options->line_termination = '\n';
2223 options->break_opt = -1;
2224 options->rename_limit = -1;
2225 options->dirstat_percent = 3;
2226 options->context = 3;
2228 options->change = diff_change;
2229 options->add_remove = diff_addremove;
2230 if (diff_use_color_default > 0)
2231 DIFF_OPT_SET(options, COLOR_DIFF);
2232 else
2233 DIFF_OPT_CLR(options, COLOR_DIFF);
2234 options->detect_rename = diff_detect_rename_default;
2236 options->a_prefix = "a/";
2237 options->b_prefix = "b/";
2238 }
2240 int diff_setup_done(struct diff_options *options)
2241 {
2242 int count = 0;
2244 if (options->output_format & DIFF_FORMAT_NAME)
2245 count++;
2246 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2247 count++;
2248 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2249 count++;
2250 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2251 count++;
2252 if (count > 1)
2253 die("--name-only, --name-status, --check and -s are mutually exclusive");
2255 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2256 options->detect_rename = DIFF_DETECT_COPY;
2258 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2259 options->prefix = NULL;
2260 if (options->prefix)
2261 options->prefix_length = strlen(options->prefix);
2262 else
2263 options->prefix_length = 0;
2265 if (options->output_format & (DIFF_FORMAT_NAME |
2266 DIFF_FORMAT_NAME_STATUS |
2267 DIFF_FORMAT_CHECKDIFF |
2268 DIFF_FORMAT_NO_OUTPUT))
2269 options->output_format &= ~(DIFF_FORMAT_RAW |
2270 DIFF_FORMAT_NUMSTAT |
2271 DIFF_FORMAT_DIFFSTAT |
2272 DIFF_FORMAT_SHORTSTAT |
2273 DIFF_FORMAT_DIRSTAT |
2274 DIFF_FORMAT_SUMMARY |
2275 DIFF_FORMAT_PATCH);
2277 /*
2278 * These cases always need recursive; we do not drop caller-supplied
2279 * recursive bits for other formats here.
2280 */
2281 if (options->output_format & (DIFF_FORMAT_PATCH |
2282 DIFF_FORMAT_NUMSTAT |
2283 DIFF_FORMAT_DIFFSTAT |
2284 DIFF_FORMAT_SHORTSTAT |
2285 DIFF_FORMAT_DIRSTAT |
2286 DIFF_FORMAT_SUMMARY |
2287 DIFF_FORMAT_CHECKDIFF))
2288 DIFF_OPT_SET(options, RECURSIVE);
2289 /*
2290 * Also pickaxe would not work very well if you do not say recursive
2291 */
2292 if (options->pickaxe)
2293 DIFF_OPT_SET(options, RECURSIVE);
2295 if (options->detect_rename && options->rename_limit < 0)
2296 options->rename_limit = diff_rename_limit_default;
2297 if (options->setup & DIFF_SETUP_USE_CACHE) {
2298 if (!active_cache)
2299 /* read-cache does not die even when it fails
2300 * so it is safe for us to do this here. Also
2301 * it does not smudge active_cache or active_nr
2302 * when it fails, so we do not have to worry about
2303 * cleaning it up ourselves either.
2304 */
2305 read_cache();
2306 }
2307 if (options->abbrev <= 0 || 40 < options->abbrev)
2308 options->abbrev = 40; /* full */
2310 /*
2311 * It does not make sense to show the first hit we happened
2312 * to have found. It does not make sense not to return with
2313 * exit code in such a case either.
2314 */
2315 if (DIFF_OPT_TST(options, QUIET)) {
2316 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2317 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2318 }
2320 /*
2321 * If we postprocess in diffcore, we cannot simply return
2322 * upon the first hit. We need to run diff as usual.
2323 */
2324 if (options->pickaxe || options->filter)
2325 DIFF_OPT_CLR(options, QUIET);
2327 return 0;
2328 }
2330 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2331 {
2332 char c, *eq;
2333 int len;
2335 if (*arg != '-')
2336 return 0;
2337 c = *++arg;
2338 if (!c)
2339 return 0;
2340 if (c == arg_short) {
2341 c = *++arg;
2342 if (!c)
2343 return 1;
2344 if (val && isdigit(c)) {
2345 char *end;
2346 int n = strtoul(arg, &end, 10);
2347 if (*end)
2348 return 0;
2349 *val = n;
2350 return 1;
2351 }
2352 return 0;
2353 }
2354 if (c != '-')
2355 return 0;
2356 arg++;
2357 eq = strchr(arg, '=');
2358 if (eq)
2359 len = eq - arg;
2360 else
2361 len = strlen(arg);
2362 if (!len || strncmp(arg, arg_long, len))
2363 return 0;
2364 if (eq) {
2365 int n;
2366 char *end;
2367 if (!isdigit(*++eq))
2368 return 0;
2369 n = strtoul(eq, &end, 10);
2370 if (*end)
2371 return 0;
2372 *val = n;
2373 }
2374 return 1;
2375 }
2377 static int diff_scoreopt_parse(const char *opt);
2379 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2380 {
2381 const char *arg = av[0];
2383 /* Output format options */
2384 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2385 options->output_format |= DIFF_FORMAT_PATCH;
2386 else if (opt_arg(arg, 'U', "unified", &options->context))
2387 options->output_format |= DIFF_FORMAT_PATCH;
2388 else if (!strcmp(arg, "--raw"))
2389 options->output_format |= DIFF_FORMAT_RAW;
2390 else if (!strcmp(arg, "--patch-with-raw"))
2391 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2392 else if (!strcmp(arg, "--numstat"))
2393 options->output_format |= DIFF_FORMAT_NUMSTAT;
2394 else if (!strcmp(arg, "--shortstat"))
2395 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2396 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2397 options->output_format |= DIFF_FORMAT_DIRSTAT;
2398 else if (!strcmp(arg, "--cumulative"))
2399 options->output_format |= DIFF_FORMAT_CUMULATIVE;
2400 else if (!strcmp(arg, "--check"))
2401 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2402 else if (!strcmp(arg, "--summary"))
2403 options->output_format |= DIFF_FORMAT_SUMMARY;
2404 else if (!strcmp(arg, "--patch-with-stat"))
2405 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2406 else if (!strcmp(arg, "--name-only"))
2407 options->output_format |= DIFF_FORMAT_NAME;
2408 else if (!strcmp(arg, "--name-status"))
2409 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2410 else if (!strcmp(arg, "-s"))
2411 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2412 else if (!prefixcmp(arg, "--stat")) {
2413 char *end;
2414 int width = options->stat_width;
2415 int name_width = options->stat_name_width;
2416 arg += 6;
2417 end = (char *)arg;
2419 switch (*arg) {
2420 case '-':
2421 if (!prefixcmp(arg, "-width="))
2422 width = strtoul(arg + 7, &end, 10);
2423 else if (!prefixcmp(arg, "-name-width="))
2424 name_width = strtoul(arg + 12, &end, 10);
2425 break;
2426 case '=':
2427 width = strtoul(arg+1, &end, 10);
2428 if (*end == ',')
2429 name_width = strtoul(end+1, &end, 10);
2430 }
2432 /* Important! This checks all the error cases! */
2433 if (*end)
2434 return 0;
2435 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2436 options->stat_name_width = name_width;
2437 options->stat_width = width;
2438 }
2440 /* renames options */
2441 else if (!prefixcmp(arg, "-B")) {
2442 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2443 return -1;
2444 }
2445 else if (!prefixcmp(arg, "-M")) {
2446 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2447 return -1;
2448 options->detect_rename = DIFF_DETECT_RENAME;
2449 }
2450 else if (!prefixcmp(arg, "-C")) {
2451 if (options->detect_rename == DIFF_DETECT_COPY)
2452 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2453 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2454 return -1;
2455 options->detect_rename = DIFF_DETECT_COPY;
2456 }
2457 else if (!strcmp(arg, "--no-renames"))
2458 options->detect_rename = 0;
2459 else if (!strcmp(arg, "--relative"))
2460 DIFF_OPT_SET(options, RELATIVE_NAME);
2461 else if (!prefixcmp(arg, "--relative=")) {
2462 DIFF_OPT_SET(options, RELATIVE_NAME);
2463 options->prefix = arg + 11;
2464 }
2466 /* xdiff options */
2467 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2468 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2469 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2470 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2471 else if (!strcmp(arg, "--ignore-space-at-eol"))
2472 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2474 /* flags options */
2475 else if (!strcmp(arg, "--binary")) {
2476 options->output_format |= DIFF_FORMAT_PATCH;
2477 DIFF_OPT_SET(options, BINARY);
2478 }
2479 else if (!strcmp(arg, "--full-index"))
2480 DIFF_OPT_SET(options, FULL_INDEX);
2481 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2482 DIFF_OPT_SET(options, TEXT);
2483 else if (!strcmp(arg, "-R"))
2484 DIFF_OPT_SET(options, REVERSE_DIFF);
2485 else if (!strcmp(arg, "--find-copies-harder"))
2486 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2487 else if (!strcmp(arg, "--follow"))
2488 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2489 else if (!strcmp(arg, "--color"))
2490 DIFF_OPT_SET(options, COLOR_DIFF);
2491 else if (!strcmp(arg, "--no-color"))
2492 DIFF_OPT_CLR(options, COLOR_DIFF);
2493 else if (!strcmp(arg, "--color-words"))
2494 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2495 else if (!strcmp(arg, "--exit-code"))
2496 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2497 else if (!strcmp(arg, "--quiet"))
2498 DIFF_OPT_SET(options, QUIET);
2499 else if (!strcmp(arg, "--ext-diff"))
2500 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2501 else if (!strcmp(arg, "--no-ext-diff"))
2502 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2503 else if (!strcmp(arg, "--ignore-submodules"))
2504 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2506 /* misc options */
2507 else if (!strcmp(arg, "-z"))
2508 options->line_termination = 0;
2509 else if (!prefixcmp(arg, "-l"))
2510 options->rename_limit = strtoul(arg+2, NULL, 10);
2511 else if (!prefixcmp(arg, "-S"))
2512 options->pickaxe = arg + 2;
2513 else if (!strcmp(arg, "--pickaxe-all"))
2514 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2515 else if (!strcmp(arg, "--pickaxe-regex"))
2516 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2517 else if (!prefixcmp(arg, "-O"))
2518 options->orderfile = arg + 2;
2519 else if (!prefixcmp(arg, "--diff-filter="))
2520 options->filter = arg + 14;
2521 else if (!strcmp(arg, "--abbrev"))
2522 options->abbrev = DEFAULT_ABBREV;
2523 else if (!prefixcmp(arg, "--abbrev=")) {
2524 options->abbrev = strtoul(arg + 9, NULL, 10);
2525 if (options->abbrev < MINIMUM_ABBREV)
2526 options->abbrev = MINIMUM_ABBREV;
2527 else if (40 < options->abbrev)
2528 options->abbrev = 40;
2529 }
2530 else if (!prefixcmp(arg, "--src-prefix="))
2531 options->a_prefix = arg + 13;
2532 else if (!prefixcmp(arg, "--dst-prefix="))
2533 options->b_prefix = arg + 13;
2534 else if (!strcmp(arg, "--no-prefix"))
2535 options->a_prefix = options->b_prefix = "";
2536 else if (!prefixcmp(arg, "--output=")) {
2537 options->file = fopen(arg + strlen("--output="), "w");
2538 options->close_file = 1;
2539 } else
2540 return 0;
2541 return 1;
2542 }
2544 static int parse_num(const char **cp_p)
2545 {
2546 unsigned long num, scale;
2547 int ch, dot;
2548 const char *cp = *cp_p;
2550 num = 0;
2551 scale = 1;
2552 dot = 0;
2553 for(;;) {
2554 ch = *cp;
2555 if ( !dot && ch == '.' ) {
2556 scale = 1;
2557 dot = 1;
2558 } else if ( ch == '%' ) {
2559 scale = dot ? scale*100 : 100;
2560 cp++; /* % is always at the end */
2561 break;
2562 } else if ( ch >= '0' && ch <= '9' ) {
2563 if ( scale < 100000 ) {
2564 scale *= 10;
2565 num = (num*10) + (ch-'0');
2566 }
2567 } else {
2568 break;
2569 }
2570 cp++;
2571 }
2572 *cp_p = cp;
2574 /* user says num divided by scale and we say internally that
2575 * is MAX_SCORE * num / scale.
2576 */
2577 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2578 }
2580 static int diff_scoreopt_parse(const char *opt)
2581 {
2582 int opt1, opt2, cmd;
2584 if (*opt++ != '-')
2585 return -1;
2586 cmd = *opt++;
2587 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2588 return -1; /* that is not a -M, -C nor -B option */
2590 opt1 = parse_num(&opt);
2591 if (cmd != 'B')
2592 opt2 = 0;
2593 else {
2594 if (*opt == 0)
2595 opt2 = 0;
2596 else if (*opt != '/')
2597 return -1; /* we expect -B80/99 or -B80 */
2598 else {
2599 opt++;
2600 opt2 = parse_num(&opt);
2601 }
2602 }
2603 if (*opt != 0)
2604 return -1;
2605 return opt1 | (opt2 << 16);
2606 }
2608 struct diff_queue_struct diff_queued_diff;
2610 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2611 {
2612 if (queue->alloc <= queue->nr) {
2613 queue->alloc = alloc_nr(queue->alloc);
2614 queue->queue = xrealloc(queue->queue,
2615 sizeof(dp) * queue->alloc);
2616 }
2617 queue->queue[queue->nr++] = dp;
2618 }
2620 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2621 struct diff_filespec *one,
2622 struct diff_filespec *two)
2623 {
2624 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2625 dp->one = one;
2626 dp->two = two;
2627 if (queue)
2628 diff_q(queue, dp);
2629 return dp;
2630 }
2632 void diff_free_filepair(struct diff_filepair *p)
2633 {
2634 free_filespec(p->one);
2635 free_filespec(p->two);
2636 free(p);
2637 }
2639 /* This is different from find_unique_abbrev() in that
2640 * it stuffs the result with dots for alignment.
2641 */
2642 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2643 {
2644 int abblen;
2645 const char *abbrev;
2646 if (len == 40)
2647 return sha1_to_hex(sha1);
2649 abbrev = find_unique_abbrev(sha1, len);
2650 abblen = strlen(abbrev);
2651 if (abblen < 37) {
2652 static char hex[41];
2653 if (len < abblen && abblen <= len + 2)
2654 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2655 else
2656 sprintf(hex, "%s...", abbrev);
2657 return hex;
2658 }
2659 return sha1_to_hex(sha1);
2660 }
2662 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2663 {
2664 int line_termination = opt->line_termination;
2665 int inter_name_termination = line_termination ? '\t' : '\0';
2667 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2668 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2669 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2670 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2671 }
2672 if (p->score) {
2673 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2674 inter_name_termination);
2675 } else {
2676 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2677 }
2679 if (p->status == DIFF_STATUS_COPIED ||
2680 p->status == DIFF_STATUS_RENAMED) {
2681 const char *name_a, *name_b;
2682 name_a = p->one->path;
2683 name_b = p->two->path;
2684 strip_prefix(opt->prefix_length, &name_a, &name_b);
2685 write_name_quoted(name_a, opt->file, inter_name_termination);
2686 write_name_quoted(name_b, opt->file, line_termination);
2687 } else {
2688 const char *name_a, *name_b;
2689 name_a = p->one->mode ? p->one->path : p->two->path;
2690 name_b = NULL;
2691 strip_prefix(opt->prefix_length, &name_a, &name_b);
2692 write_name_quoted(name_a, opt->file, line_termination);
2693 }
2694 }
2696 int diff_unmodified_pair(struct diff_filepair *p)
2697 {
2698 /* This function is written stricter than necessary to support
2699 * the currently implemented transformers, but the idea is to
2700 * let transformers to produce diff_filepairs any way they want,
2701 * and filter and clean them up here before producing the output.
2702 */
2703 struct diff_filespec *one = p->one, *two = p->two;
2705 if (DIFF_PAIR_UNMERGED(p))
2706 return 0; /* unmerged is interesting */
2708 /* deletion, addition, mode or type change
2709 * and rename are all interesting.
2710 */
2711 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2712 DIFF_PAIR_MODE_CHANGED(p) ||
2713 strcmp(one->path, two->path))
2714 return 0;
2716 /* both are valid and point at the same path. that is, we are
2717 * dealing with a change.
2718 */
2719 if (one->sha1_valid && two->sha1_valid &&
2720 !hashcmp(one->sha1, two->sha1))
2721 return 1; /* no change */
2722 if (!one->sha1_valid && !two->sha1_valid)
2723 return 1; /* both look at the same file on the filesystem. */
2724 return 0;
2725 }
2727 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2728 {
2729 if (diff_unmodified_pair(p))
2730 return;
2732 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2733 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2734 return; /* no tree diffs in patch format */
2736 run_diff(p, o);
2737 }
2739 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2740 struct diffstat_t *diffstat)
2741 {
2742 if (diff_unmodified_pair(p))
2743 return;
2745 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2746 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2747 return; /* no tree diffs in patch format */
2749 run_diffstat(p, o, diffstat);
2750 }
2752 static void diff_flush_checkdiff(struct diff_filepair *p,
2753 struct diff_options *o)
2754 {
2755 if (diff_unmodified_pair(p))
2756 return;
2758 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2759 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2760 return; /* no tree diffs in patch format */
2762 run_checkdiff(p, o);
2763 }
2765 int diff_queue_is_empty(void)
2766 {
2767 struct diff_queue_struct *q = &diff_queued_diff;
2768 int i;
2769 for (i = 0; i < q->nr; i++)
2770 if (!diff_unmodified_pair(q->queue[i]))
2771 return 0;
2772 return 1;
2773 }
2775 #if DIFF_DEBUG
2776 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2777 {
2778 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2779 x, one ? one : "",
2780 s->path,
2781 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2782 s->mode,
2783 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2784 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2785 x, one ? one : "",
2786 s->size, s->xfrm_flags);
2787 }
2789 void diff_debug_filepair(const struct diff_filepair *p, int i)
2790 {
2791 diff_debug_filespec(p->one, i, "one");
2792 diff_debug_filespec(p->two, i, "two");
2793 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2794 p->score, p->status ? p->status : '?',
2795 p->one->rename_used, p->broken_pair);
2796 }
2798 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2799 {
2800 int i;
2801 if (msg)
2802 fprintf(stderr, "%s\n", msg);
2803 fprintf(stderr, "q->nr = %d\n", q->nr);
2804 for (i = 0; i < q->nr; i++) {
2805 struct diff_filepair *p = q->queue[i];
2806 diff_debug_filepair(p, i);
2807 }
2808 }
2809 #endif
2811 static void diff_resolve_rename_copy(void)
2812 {
2813 int i;
2814 struct diff_filepair *p;
2815 struct diff_queue_struct *q = &diff_queued_diff;
2817 diff_debug_queue("resolve-rename-copy", q);
2819 for (i = 0; i < q->nr; i++) {
2820 p = q->queue[i];
2821 p->status = 0; /* undecided */
2822 if (DIFF_PAIR_UNMERGED(p))
2823 p->status = DIFF_STATUS_UNMERGED;
2824 else if (!DIFF_FILE_VALID(p->one))
2825 p->status = DIFF_STATUS_ADDED;
2826 else if (!DIFF_FILE_VALID(p->two))
2827 p->status = DIFF_STATUS_DELETED;
2828 else if (DIFF_PAIR_TYPE_CHANGED(p))
2829 p->status = DIFF_STATUS_TYPE_CHANGED;
2831 /* from this point on, we are dealing with a pair
2832 * whose both sides are valid and of the same type, i.e.
2833 * either in-place edit or rename/copy edit.
2834 */
2835 else if (DIFF_PAIR_RENAME(p)) {
2836 /*
2837 * A rename might have re-connected a broken
2838 * pair up, causing the pathnames to be the
2839 * same again. If so, that's not a rename at
2840 * all, just a modification..
2841 *
2842 * Otherwise, see if this source was used for
2843 * multiple renames, in which case we decrement
2844 * the count, and call it a copy.
2845 */
2846 if (!strcmp(p->one->path, p->two->path))
2847 p->status = DIFF_STATUS_MODIFIED;
2848 else if (--p->one->rename_used > 0)
2849 p->status = DIFF_STATUS_COPIED;
2850 else
2851 p->status = DIFF_STATUS_RENAMED;
2852 }
2853 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2854 p->one->mode != p->two->mode ||
2855 is_null_sha1(p->one->sha1))
2856 p->status = DIFF_STATUS_MODIFIED;
2857 else {
2858 /* This is a "no-change" entry and should not
2859 * happen anymore, but prepare for broken callers.
2860 */
2861 error("feeding unmodified %s to diffcore",
2862 p->one->path);
2863 p->status = DIFF_STATUS_UNKNOWN;
2864 }
2865 }
2866 diff_debug_queue("resolve-rename-copy done", q);
2867 }
2869 static int check_pair_status(struct diff_filepair *p)
2870 {
2871 switch (p->status) {
2872 case DIFF_STATUS_UNKNOWN:
2873 return 0;
2874 case 0:
2875 die("internal error in diff-resolve-rename-copy");
2876 default:
2877 return 1;
2878 }
2879 }
2881 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2882 {
2883 int fmt = opt->output_format;
2885 if (fmt & DIFF_FORMAT_CHECKDIFF)
2886 diff_flush_checkdiff(p, opt);
2887 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2888 diff_flush_raw(p, opt);
2889 else if (fmt & DIFF_FORMAT_NAME) {
2890 const char *name_a, *name_b;
2891 name_a = p->two->path;
2892 name_b = NULL;
2893 strip_prefix(opt->prefix_length, &name_a, &name_b);
2894 write_name_quoted(name_a, opt->file, opt->line_termination);
2895 }
2896 }
2898 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
2899 {
2900 if (fs->mode)
2901 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
2902 else
2903 fprintf(file, " %s ", newdelete);
2904 write_name_quoted(fs->path, file, '\n');
2905 }
2908 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
2909 {
2910 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2911 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
2912 show_name ? ' ' : '\n');
2913 if (show_name) {
2914 write_name_quoted(p->two->path, file, '\n');
2915 }
2916 }
2917 }
2919 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
2920 {
2921 char *names = pprint_rename(p->one->path, p->two->path);
2923 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2924 free(names);
2925 show_mode_change(file, p, 0);
2926 }
2928 static void diff_summary(FILE *file, struct diff_filepair *p)
2929 {
2930 switch(p->status) {
2931 case DIFF_STATUS_DELETED:
2932 show_file_mode_name(file, "delete", p->one);
2933 break;
2934 case DIFF_STATUS_ADDED:
2935 show_file_mode_name(file, "create", p->two);
2936 break;
2937 case DIFF_STATUS_COPIED:
2938 show_rename_copy(file, "copy", p);
2939 break;
2940 case DIFF_STATUS_RENAMED:
2941 show_rename_copy(file, "rename", p);
2942 break;
2943 default:
2944 if (p->score) {
2945 fputs(" rewrite ", file);
2946 write_name_quoted(p->two->path, file, ' ');
2947 fprintf(file, "(%d%%)\n", similarity_index(p));
2948 }
2949 show_mode_change(file, p, !p->score);
2950 break;
2951 }
2952 }
2954 struct patch_id_t {
2955 struct xdiff_emit_state xm;
2956 SHA_CTX *ctx;
2957 int patchlen;
2958 };
2960 static int remove_space(char *line, int len)
2961 {
2962 int i;
2963 char *dst = line;
2964 unsigned char c;
2966 for (i = 0; i < len; i++)
2967 if (!isspace((c = line[i])))
2968 *dst++ = c;
2970 return dst - line;
2971 }
2973 static void patch_id_consume(void *priv, char *line, unsigned long len)
2974 {
2975 struct patch_id_t *data = priv;
2976 int new_len;
2978 /* Ignore line numbers when computing the SHA1 of the patch */
2979 if (!prefixcmp(line, "@@ -"))
2980 return;
2982 new_len = remove_space(line, len);
2984 SHA1_Update(data->ctx, line, new_len);
2985 data->patchlen += new_len;
2986 }
2988 /* returns 0 upon success, and writes result into sha1 */
2989 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2990 {
2991 struct diff_queue_struct *q = &diff_queued_diff;
2992 int i;
2993 SHA_CTX ctx;
2994 struct patch_id_t data;
2995 char buffer[PATH_MAX * 4 + 20];
2997 SHA1_Init(&ctx);
2998 memset(&data, 0, sizeof(struct patch_id_t));
2999 data.ctx = &ctx;
3000 data.xm.consume = patch_id_consume;
3002 for (i = 0; i < q->nr; i++) {
3003 xpparam_t xpp;
3004 xdemitconf_t xecfg;
3005 xdemitcb_t ecb;
3006 mmfile_t mf1, mf2;
3007 struct diff_filepair *p = q->queue[i];
3008 int len1, len2;
3010 memset(&xecfg, 0, sizeof(xecfg));
3011 if (p->status == 0)
3012 return error("internal diff status error");
3013 if (p->status == DIFF_STATUS_UNKNOWN)
3014 continue;
3015 if (diff_unmodified_pair(p))
3016 continue;
3017 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3018 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3019 continue;
3020 if (DIFF_PAIR_UNMERGED(p))
3021 continue;
3023 diff_fill_sha1_info(p->one);
3024 diff_fill_sha1_info(p->two);
3025 if (fill_mmfile(&mf1, p->one) < 0 ||
3026 fill_mmfile(&mf2, p->two) < 0)
3027 return error("unable to read files to diff");
3029 len1 = remove_space(p->one->path, strlen(p->one->path));
3030 len2 = remove_space(p->two->path, strlen(p->two->path));
3031 if (p->one->mode == 0)
3032 len1 = snprintf(buffer, sizeof(buffer),
3033 "diff--gita/%.*sb/%.*s"
3034 "newfilemode%06o"
3035 "---/dev/null"
3036 "+++b/%.*s",
3037 len1, p->one->path,
3038 len2, p->two->path,
3039 p->two->mode,
3040 len2, p->two->path);
3041 else if (p->two->mode == 0)
3042 len1 = snprintf(buffer, sizeof(buffer),
3043 "diff--gita/%.*sb/%.*s"
3044 "deletedfilemode%06o"
3045 "---a/%.*s"
3046 "+++/dev/null",
3047 len1, p->one->path,
3048 len2, p->two->path,
3049 p->one->mode,
3050 len1, p->one->path);
3051 else
3052 len1 = snprintf(buffer, sizeof(buffer),
3053 "diff--gita/%.*sb/%.*s"
3054 "---a/%.*s"
3055 "+++b/%.*s",
3056 len1, p->one->path,
3057 len2, p->two->path,
3058 len1, p->one->path,
3059 len2, p->two->path);
3060 SHA1_Update(&ctx, buffer, len1);
3062 xpp.flags = XDF_NEED_MINIMAL;
3063 xecfg.ctxlen = 3;
3064 xecfg.flags = XDL_EMIT_FUNCNAMES;
3065 ecb.outf = xdiff_outf;
3066 ecb.priv = &data;
3067 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
3068 }
3070 SHA1_Final(sha1, &ctx);
3071 return 0;
3072 }
3074 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3075 {
3076 struct diff_queue_struct *q = &diff_queued_diff;
3077 int i;
3078 int result = diff_get_patch_id(options, sha1);
3080 for (i = 0; i < q->nr; i++)
3081 diff_free_filepair(q->queue[i]);
3083 free(q->queue);
3084 q->queue = NULL;
3085 q->nr = q->alloc = 0;
3087 return result;
3088 }
3090 static int is_summary_empty(const struct diff_queue_struct *q)
3091 {
3092 int i;
3094 for (i = 0; i < q->nr; i++) {
3095 const struct diff_filepair *p = q->queue[i];
3097 switch (p->status) {
3098 case DIFF_STATUS_DELETED:
3099 case DIFF_STATUS_ADDED:
3100 case DIFF_STATUS_COPIED:
3101 case DIFF_STATUS_RENAMED:
3102 return 0;
3103 default:
3104 if (p->score)
3105 return 0;
3106 if (p->one->mode && p->two->mode &&
3107 p->one->mode != p->two->mode)
3108 return 0;
3109 break;
3110 }
3111 }
3112 return 1;
3113 }
3115 void diff_flush(struct diff_options *options)
3116 {
3117 struct diff_queue_struct *q = &diff_queued_diff;
3118 int i, output_format = options->output_format;
3119 int separator = 0;
3121 /*
3122 * Order: raw, stat, summary, patch
3123 * or: name/name-status/checkdiff (other bits clear)
3124 */
3125 if (!q->nr)
3126 goto free_queue;
3128 if (output_format & (DIFF_FORMAT_RAW |
3129 DIFF_FORMAT_NAME |
3130 DIFF_FORMAT_NAME_STATUS |
3131 DIFF_FORMAT_CHECKDIFF)) {
3132 for (i = 0; i < q->nr; i++) {
3133 struct diff_filepair *p = q->queue[i];
3134 if (check_pair_status(p))
3135 flush_one_pair(p, options);
3136 }
3137 separator++;
3138 }
3140 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3141 struct diffstat_t diffstat;
3143 memset(&diffstat, 0, sizeof(struct diffstat_t));
3144 diffstat.xm.consume = diffstat_consume;
3145 for (i = 0; i < q->nr; i++) {
3146 struct diff_filepair *p = q->queue[i];
3147 if (check_pair_status(p))
3148 diff_flush_stat(p, options, &diffstat);
3149 }
3150 if (output_format & DIFF_FORMAT_NUMSTAT)
3151 show_numstat(&diffstat, options);
3152 if (output_format & DIFF_FORMAT_DIFFSTAT)
3153 show_stats(&diffstat, options);
3154 if (output_format & DIFF_FORMAT_SHORTSTAT)
3155 show_shortstats(&diffstat, options);
3156 free_diffstat_info(&diffstat);
3157 separator++;
3158 }
3159 if (output_format & DIFF_FORMAT_DIRSTAT)
3160 show_dirstat(options);
3162 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3163 for (i = 0; i < q->nr; i++)
3164 diff_summary(options->file, q->queue[i]);
3165 separator++;
3166 }
3168 if (output_format & DIFF_FORMAT_PATCH) {
3169 if (separator) {
3170 if (options->stat_sep) {
3171 /* attach patch instead of inline */
3172 fputs(options->stat_sep, options->file);
3173 } else {
3174 putc(options->line_termination, options->file);
3175 }
3176 }
3178 for (i = 0; i < q->nr; i++) {
3179 struct diff_filepair *p = q->queue[i];
3180 if (check_pair_status(p))
3181 diff_flush_patch(p, options);
3182 }
3183 }
3185 if (output_format & DIFF_FORMAT_CALLBACK)
3186 options->format_callback(q, options, options->format_callback_data);
3188 for (i = 0; i < q->nr; i++)
3189 diff_free_filepair(q->queue[i]);
3190 free_queue:
3191 free(q->queue);
3192 q->queue = NULL;
3193 q->nr = q->alloc = 0;
3194 if (options->close_file)
3195 fclose(options->file);
3196 }
3198 static void diffcore_apply_filter(const char *filter)
3199 {
3200 int i;
3201 struct diff_queue_struct *q = &diff_queued_diff;
3202 struct diff_queue_struct outq;
3203 outq.queue = NULL;
3204 outq.nr = outq.alloc = 0;
3206 if (!filter)
3207 return;
3209 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3210 int found;
3211 for (i = found = 0; !found && i < q->nr; i++) {
3212 struct diff_filepair *p = q->queue[i];
3213 if (((p->status == DIFF_STATUS_MODIFIED) &&
3214 ((p->score &&
3215 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3216 (!p->score &&
3217 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3218 ((p->status != DIFF_STATUS_MODIFIED) &&
3219 strchr(filter, p->status)))
3220 found++;
3221 }
3222 if (found)
3223 return;
3225 /* otherwise we will clear the whole queue
3226 * by copying the empty outq at the end of this
3227 * function, but first clear the current entries
3228 * in the queue.
3229 */
3230 for (i = 0; i < q->nr; i++)
3231 diff_free_filepair(q->queue[i]);
3232 }
3233 else {
3234 /* Only the matching ones */
3235 for (i = 0; i < q->nr; i++) {
3236 struct diff_filepair *p = q->queue[i];
3238 if (((p->status == DIFF_STATUS_MODIFIED) &&
3239 ((p->score &&
3240 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3241 (!p->score &&
3242 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3243 ((p->status != DIFF_STATUS_MODIFIED) &&
3244 strchr(filter, p->status)))
3245 diff_q(&outq, p);
3246 else
3247 diff_free_filepair(p);
3248 }
3249 }
3250 free(q->queue);
3251 *q = outq;
3252 }
3254 /* Check whether two filespecs with the same mode and size are identical */
3255 static int diff_filespec_is_identical(struct diff_filespec *one,
3256 struct diff_filespec *two)
3257 {
3258 if (S_ISGITLINK(one->mode))
3259 return 0;
3260 if (diff_populate_filespec(one, 0))
3261 return 0;
3262 if (diff_populate_filespec(two, 0))
3263 return 0;
3264 return !memcmp(one->data, two->data, one->size);
3265 }
3267 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3268 {
3269 int i;
3270 struct diff_queue_struct *q = &diff_queued_diff;
3271 struct diff_queue_struct outq;
3272 outq.queue = NULL;
3273 outq.nr = outq.alloc = 0;
3275 for (i = 0; i < q->nr; i++) {
3276 struct diff_filepair *p = q->queue[i];
3278 /*
3279 * 1. Entries that come from stat info dirtyness
3280 * always have both sides (iow, not create/delete),
3281 * one side of the object name is unknown, with
3282 * the same mode and size. Keep the ones that
3283 * do not match these criteria. They have real
3284 * differences.
3285 *
3286 * 2. At this point, the file is known to be modified,
3287 * with the same mode and size, and the object
3288 * name of one side is unknown. Need to inspect
3289 * the identical contents.
3290 */
3291 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3292 !DIFF_FILE_VALID(p->two) ||
3293 (p->one->sha1_valid && p->two->sha1_valid) ||
3294 (p->one->mode != p->two->mode) ||
3295 diff_populate_filespec(p->one, 1) ||
3296 diff_populate_filespec(p->two, 1) ||
3297 (p->one->size != p->two->size) ||
3298 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3299 diff_q(&outq, p);
3300 else {
3301 /*
3302 * The caller can subtract 1 from skip_stat_unmatch
3303 * to determine how many paths were dirty only
3304 * due to stat info mismatch.
3305 */
3306 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3307 diffopt->skip_stat_unmatch++;
3308 diff_free_filepair(p);
3309 }
3310 }
3311 free(q->queue);
3312 *q = outq;
3313 }
3315 void diffcore_std(struct diff_options *options)
3316 {
3317 if (DIFF_OPT_TST(options, QUIET))
3318 return;
3320 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3321 diffcore_skip_stat_unmatch(options);
3322 if (options->break_opt != -1)
3323 diffcore_break(options->break_opt);
3324 if (options->detect_rename)
3325 diffcore_rename(options);
3326 if (options->break_opt != -1)
3327 diffcore_merge_broken();
3328 if (options->pickaxe)
3329 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3330 if (options->orderfile)
3331 diffcore_order(options->orderfile);
3332 diff_resolve_rename_copy();
3333 diffcore_apply_filter(options->filter);
3335 if (diff_queued_diff.nr)
3336 DIFF_OPT_SET(options, HAS_CHANGES);
3337 else
3338 DIFF_OPT_CLR(options, HAS_CHANGES);
3339 }
3341 int diff_result_code(struct diff_options *opt, int status)
3342 {
3343 int result = 0;
3344 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3345 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3346 return status;
3347 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3348 DIFF_OPT_TST(opt, HAS_CHANGES))
3349 result |= 01;
3350 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3351 DIFF_OPT_TST(opt, CHECK_FAILED))
3352 result |= 02;
3353 return result;
3354 }
3356 void diff_addremove(struct diff_options *options,
3357 int addremove, unsigned mode,
3358 const unsigned char *sha1,
3359 const char *base, const char *path)
3360 {
3361 char concatpath[PATH_MAX];
3362 struct diff_filespec *one, *two;
3364 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3365 return;
3367 /* This may look odd, but it is a preparation for
3368 * feeding "there are unchanged files which should
3369 * not produce diffs, but when you are doing copy
3370 * detection you would need them, so here they are"
3371 * entries to the diff-core. They will be prefixed
3372 * with something like '=' or '*' (I haven't decided
3373 * which but should not make any difference).
3374 * Feeding the same new and old to diff_change()
3375 * also has the same effect.
3376 * Before the final output happens, they are pruned after
3377 * merged into rename/copy pairs as appropriate.
3378 */
3379 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3380 addremove = (addremove == '+' ? '-' :
3381 addremove == '-' ? '+' : addremove);
3383 if (!path) path = "";
3384 sprintf(concatpath, "%s%s", base, path);
3386 if (options->prefix &&
3387 strncmp(concatpath, options->prefix, options->prefix_length))
3388 return;
3390 one = alloc_filespec(concatpath);
3391 two = alloc_filespec(concatpath);
3393 if (addremove != '+')
3394 fill_filespec(one, sha1, mode);
3395 if (addremove != '-')
3396 fill_filespec(two, sha1, mode);
3398 diff_queue(&diff_queued_diff, one, two);
3399 DIFF_OPT_SET(options, HAS_CHANGES);
3400 }
3402 void diff_change(struct diff_options *options,
3403 unsigned old_mode, unsigned new_mode,
3404 const unsigned char *old_sha1,
3405 const unsigned char *new_sha1,
3406 const char *base, const char *path)
3407 {
3408 char concatpath[PATH_MAX];
3409 struct diff_filespec *one, *two;
3411 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3412 && S_ISGITLINK(new_mode))
3413 return;
3415 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3416 unsigned tmp;
3417 const unsigned char *tmp_c;
3418 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3419 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3420 }
3421 if (!path) path = "";
3422 sprintf(concatpath, "%s%s", base, path);
3424 if (options->prefix &&
3425 strncmp(concatpath, options->prefix, options->prefix_length))
3426 return;
3428 one = alloc_filespec(concatpath);
3429 two = alloc_filespec(concatpath);
3430 fill_filespec(one, old_sha1, old_mode);
3431 fill_filespec(two, new_sha1, new_mode);
3433 diff_queue(&diff_queued_diff, one, two);
3434 DIFF_OPT_SET(options, HAS_CHANGES);
3435 }
3437 void diff_unmerge(struct diff_options *options,
3438 const char *path,
3439 unsigned mode, const unsigned char *sha1)
3440 {
3441 struct diff_filespec *one, *two;
3443 if (options->prefix &&
3444 strncmp(path, options->prefix, options->prefix_length))
3445 return;
3447 one = alloc_filespec(path);
3448 two = alloc_filespec(path);
3449 fill_filespec(one, sha1, mode);
3450 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3451 }