diff --whitespace: fix blank lines at end
[git/git.git] / diff.c
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"
14
15 #ifdef NO_FAST_WORKING_DIRECTORY
16 #define FAST_WORKING_DIRECTORY 0
17 #else
18 #define FAST_WORKING_DIRECTORY 1
19 #endif
20
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;
26
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 };
37
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 }
56
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;
62
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;
74
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 }
88
89 return git_config_string(&(drv->cmd), var, value);
90 }
91
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 struct funcname_pattern_entry {
98 char *name;
99 char *pattern;
100 int cflags;
101 };
102 static struct funcname_pattern_list {
103 struct funcname_pattern_list *next;
104 struct funcname_pattern_entry e;
105 } *funcname_pattern_list;
106
107 static int parse_funcname_pattern(const char *var, const char *ep, const char *value, int cflags)
108 {
109 const char *name;
110 int namelen;
111 struct funcname_pattern_list *pp;
112
113 name = var + 5; /* "diff." */
114 namelen = ep - name;
115
116 for (pp = funcname_pattern_list; pp; pp = pp->next)
117 if (!strncmp(pp->e.name, name, namelen) && !pp->e.name[namelen])
118 break;
119 if (!pp) {
120 pp = xcalloc(1, sizeof(*pp));
121 pp->e.name = xmemdupz(name, namelen);
122 pp->next = funcname_pattern_list;
123 funcname_pattern_list = pp;
124 }
125 free(pp->e.pattern);
126 pp->e.pattern = xstrdup(value);
127 pp->e.cflags = cflags;
128 return 0;
129 }
130
131 /*
132 * These are to give UI layer defaults.
133 * The core-level commands such as git-diff-files should
134 * never be affected by the setting of diff.renames
135 * the user happens to have in the configuration file.
136 */
137 int git_diff_ui_config(const char *var, const char *value, void *cb)
138 {
139 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
140 diff_use_color_default = git_config_colorbool(var, value, -1);
141 return 0;
142 }
143 if (!strcmp(var, "diff.renames")) {
144 if (!value)
145 diff_detect_rename_default = DIFF_DETECT_RENAME;
146 else if (!strcasecmp(value, "copies") ||
147 !strcasecmp(value, "copy"))
148 diff_detect_rename_default = DIFF_DETECT_COPY;
149 else if (git_config_bool(var,value))
150 diff_detect_rename_default = DIFF_DETECT_RENAME;
151 return 0;
152 }
153 if (!strcmp(var, "diff.autorefreshindex")) {
154 diff_auto_refresh_index = git_config_bool(var, value);
155 return 0;
156 }
157 if (!strcmp(var, "diff.external"))
158 return git_config_string(&external_diff_cmd_cfg, var, value);
159 if (!prefixcmp(var, "diff.")) {
160 const char *ep = strrchr(var, '.');
161
162 if (ep != var + 4 && !strcmp(ep, ".command"))
163 return parse_lldiff_command(var, ep, value);
164 }
165
166 return git_diff_basic_config(var, value, cb);
167 }
168
169 int git_diff_basic_config(const char *var, const char *value, void *cb)
170 {
171 if (!strcmp(var, "diff.renamelimit")) {
172 diff_rename_limit_default = git_config_int(var, value);
173 return 0;
174 }
175
176 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
177 int slot = parse_diff_color_slot(var, 11);
178 if (!value)
179 return config_error_nonbool(var);
180 color_parse(value, var, diff_colors[slot]);
181 return 0;
182 }
183
184 if (!prefixcmp(var, "diff.")) {
185 const char *ep = strrchr(var, '.');
186 if (ep != var + 4) {
187 if (!strcmp(ep, ".funcname")) {
188 if (!value)
189 return config_error_nonbool(var);
190 return parse_funcname_pattern(var, ep, value,
191 0);
192 } else if (!strcmp(ep, ".xfuncname")) {
193 if (!value)
194 return config_error_nonbool(var);
195 return parse_funcname_pattern(var, ep, value,
196 REG_EXTENDED);
197 }
198 }
199 }
200
201 return git_color_default_config(var, value, cb);
202 }
203
204 static char *quote_two(const char *one, const char *two)
205 {
206 int need_one = quote_c_style(one, NULL, NULL, 1);
207 int need_two = quote_c_style(two, NULL, NULL, 1);
208 struct strbuf res;
209
210 strbuf_init(&res, 0);
211 if (need_one + need_two) {
212 strbuf_addch(&res, '"');
213 quote_c_style(one, &res, NULL, 1);
214 quote_c_style(two, &res, NULL, 1);
215 strbuf_addch(&res, '"');
216 } else {
217 strbuf_addstr(&res, one);
218 strbuf_addstr(&res, two);
219 }
220 return strbuf_detach(&res, NULL);
221 }
222
223 static const char *external_diff(void)
224 {
225 static const char *external_diff_cmd = NULL;
226 static int done_preparing = 0;
227
228 if (done_preparing)
229 return external_diff_cmd;
230 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
231 if (!external_diff_cmd)
232 external_diff_cmd = external_diff_cmd_cfg;
233 done_preparing = 1;
234 return external_diff_cmd;
235 }
236
237 static struct diff_tempfile {
238 const char *name; /* filename external diff should read from */
239 char hex[41];
240 char mode[10];
241 char tmp_path[PATH_MAX];
242 } diff_temp[2];
243
244 static int count_lines(const char *data, int size)
245 {
246 int count, ch, completely_empty = 1, nl_just_seen = 0;
247 count = 0;
248 while (0 < size--) {
249 ch = *data++;
250 if (ch == '\n') {
251 count++;
252 nl_just_seen = 1;
253 completely_empty = 0;
254 }
255 else {
256 nl_just_seen = 0;
257 completely_empty = 0;
258 }
259 }
260 if (completely_empty)
261 return 0;
262 if (!nl_just_seen)
263 count++; /* no trailing newline */
264 return count;
265 }
266
267 static void print_line_count(FILE *file, int count)
268 {
269 switch (count) {
270 case 0:
271 fprintf(file, "0,0");
272 break;
273 case 1:
274 fprintf(file, "1");
275 break;
276 default:
277 fprintf(file, "1,%d", count);
278 break;
279 }
280 }
281
282 static void copy_file_with_prefix(FILE *file,
283 int prefix, const char *data, int size,
284 const char *set, const char *reset)
285 {
286 int ch, nl_just_seen = 1;
287 while (0 < size--) {
288 ch = *data++;
289 if (nl_just_seen) {
290 fputs(set, file);
291 putc(prefix, file);
292 }
293 if (ch == '\n') {
294 nl_just_seen = 1;
295 fputs(reset, file);
296 } else
297 nl_just_seen = 0;
298 putc(ch, file);
299 }
300 if (!nl_just_seen)
301 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
302 }
303
304 static void emit_rewrite_diff(const char *name_a,
305 const char *name_b,
306 struct diff_filespec *one,
307 struct diff_filespec *two,
308 struct diff_options *o)
309 {
310 int lc_a, lc_b;
311 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
312 const char *name_a_tab, *name_b_tab;
313 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
314 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
315 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
316 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
317 const char *reset = diff_get_color(color_diff, DIFF_RESET);
318 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
319
320 name_a += (*name_a == '/');
321 name_b += (*name_b == '/');
322 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
323 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
324
325 strbuf_reset(&a_name);
326 strbuf_reset(&b_name);
327 quote_two_c_style(&a_name, o->a_prefix, name_a, 0);
328 quote_two_c_style(&b_name, o->b_prefix, name_b, 0);
329
330 diff_populate_filespec(one, 0);
331 diff_populate_filespec(two, 0);
332 lc_a = count_lines(one->data, one->size);
333 lc_b = count_lines(two->data, two->size);
334 fprintf(o->file,
335 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
336 metainfo, a_name.buf, name_a_tab, reset,
337 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
338 print_line_count(o->file, lc_a);
339 fprintf(o->file, " +");
340 print_line_count(o->file, lc_b);
341 fprintf(o->file, " @@%s\n", reset);
342 if (lc_a)
343 copy_file_with_prefix(o->file, '-', one->data, one->size, old, reset);
344 if (lc_b)
345 copy_file_with_prefix(o->file, '+', two->data, two->size, new, reset);
346 }
347
348 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
349 {
350 if (!DIFF_FILE_VALID(one)) {
351 mf->ptr = (char *)""; /* does not matter */
352 mf->size = 0;
353 return 0;
354 }
355 else if (diff_populate_filespec(one, 0))
356 return -1;
357 mf->ptr = one->data;
358 mf->size = one->size;
359 return 0;
360 }
361
362 struct diff_words_buffer {
363 mmfile_t text;
364 long alloc;
365 long current; /* output pointer */
366 int suppressed_newline;
367 };
368
369 static void diff_words_append(char *line, unsigned long len,
370 struct diff_words_buffer *buffer)
371 {
372 if (buffer->text.size + len > buffer->alloc) {
373 buffer->alloc = (buffer->text.size + len) * 3 / 2;
374 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
375 }
376 line++;
377 len--;
378 memcpy(buffer->text.ptr + buffer->text.size, line, len);
379 buffer->text.size += len;
380 }
381
382 struct diff_words_data {
383 struct xdiff_emit_state xm;
384 struct diff_words_buffer minus, plus;
385 FILE *file;
386 };
387
388 static void print_word(FILE *file, struct diff_words_buffer *buffer, int len, int color,
389 int suppress_newline)
390 {
391 const char *ptr;
392 int eol = 0;
393
394 if (len == 0)
395 return;
396
397 ptr = buffer->text.ptr + buffer->current;
398 buffer->current += len;
399
400 if (ptr[len - 1] == '\n') {
401 eol = 1;
402 len--;
403 }
404
405 fputs(diff_get_color(1, color), file);
406 fwrite(ptr, len, 1, file);
407 fputs(diff_get_color(1, DIFF_RESET), file);
408
409 if (eol) {
410 if (suppress_newline)
411 buffer->suppressed_newline = 1;
412 else
413 putc('\n', file);
414 }
415 }
416
417 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
418 {
419 struct diff_words_data *diff_words = priv;
420
421 if (diff_words->minus.suppressed_newline) {
422 if (line[0] != '+')
423 putc('\n', diff_words->file);
424 diff_words->minus.suppressed_newline = 0;
425 }
426
427 len--;
428 switch (line[0]) {
429 case '-':
430 print_word(diff_words->file,
431 &diff_words->minus, len, DIFF_FILE_OLD, 1);
432 break;
433 case '+':
434 print_word(diff_words->file,
435 &diff_words->plus, len, DIFF_FILE_NEW, 0);
436 break;
437 case ' ':
438 print_word(diff_words->file,
439 &diff_words->plus, len, DIFF_PLAIN, 0);
440 diff_words->minus.current += len;
441 break;
442 }
443 }
444
445 /* this executes the word diff on the accumulated buffers */
446 static void diff_words_show(struct diff_words_data *diff_words)
447 {
448 xpparam_t xpp;
449 xdemitconf_t xecfg;
450 xdemitcb_t ecb;
451 mmfile_t minus, plus;
452 int i;
453
454 memset(&xecfg, 0, sizeof(xecfg));
455 minus.size = diff_words->minus.text.size;
456 minus.ptr = xmalloc(minus.size);
457 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
458 for (i = 0; i < minus.size; i++)
459 if (isspace(minus.ptr[i]))
460 minus.ptr[i] = '\n';
461 diff_words->minus.current = 0;
462
463 plus.size = diff_words->plus.text.size;
464 plus.ptr = xmalloc(plus.size);
465 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
466 for (i = 0; i < plus.size; i++)
467 if (isspace(plus.ptr[i]))
468 plus.ptr[i] = '\n';
469 diff_words->plus.current = 0;
470
471 xpp.flags = XDF_NEED_MINIMAL;
472 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
473 ecb.outf = xdiff_outf;
474 ecb.priv = diff_words;
475 diff_words->xm.consume = fn_out_diff_words_aux;
476 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
477
478 free(minus.ptr);
479 free(plus.ptr);
480 diff_words->minus.text.size = diff_words->plus.text.size = 0;
481
482 if (diff_words->minus.suppressed_newline) {
483 putc('\n', diff_words->file);
484 diff_words->minus.suppressed_newline = 0;
485 }
486 }
487
488 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
489
490 struct emit_callback {
491 struct xdiff_emit_state xm;
492 int color_diff;
493 unsigned ws_rule;
494 int blank_at_eof_in_preimage;
495 int blank_at_eof_in_postimage;
496 int lno_in_preimage;
497 int lno_in_postimage;
498 sane_truncate_fn truncate;
499 const char **label_path;
500 struct diff_words_data *diff_words;
501 int *found_changesp;
502 FILE *file;
503 };
504
505 static void free_diff_words_data(struct emit_callback *ecbdata)
506 {
507 if (ecbdata->diff_words) {
508 /* flush buffers */
509 if (ecbdata->diff_words->minus.text.size ||
510 ecbdata->diff_words->plus.text.size)
511 diff_words_show(ecbdata->diff_words);
512
513 free (ecbdata->diff_words->minus.text.ptr);
514 free (ecbdata->diff_words->plus.text.ptr);
515 free(ecbdata->diff_words);
516 ecbdata->diff_words = NULL;
517 }
518 }
519
520 const char *diff_get_color(int diff_use_color, enum color_diff ix)
521 {
522 if (diff_use_color)
523 return diff_colors[ix];
524 return "";
525 }
526
527 static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
528 {
529 int has_trailing_newline, has_trailing_carriage_return;
530
531 has_trailing_newline = (len > 0 && line[len-1] == '\n');
532 if (has_trailing_newline)
533 len--;
534 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
535 if (has_trailing_carriage_return)
536 len--;
537
538 fputs(set, file);
539 fwrite(line, len, 1, file);
540 fputs(reset, file);
541 if (has_trailing_carriage_return)
542 fputc('\r', file);
543 if (has_trailing_newline)
544 fputc('\n', file);
545 }
546
547 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
548 {
549 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
550 ecbdata->blank_at_eof_in_preimage &&
551 ecbdata->blank_at_eof_in_postimage &&
552 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
553 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
554 return 0;
555 return ws_blank_line(line + 1, len - 1, ecbdata->ws_rule);
556 }
557
558 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
559 {
560 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
561 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
562
563 if (!*ws)
564 emit_line(ecbdata->file, set, reset, line, len);
565 else if (new_blank_line_at_eof(ecbdata, line, len))
566 /* Blank line at EOF - paint '+' as well */
567 emit_line(ecbdata->file, ws, reset, line, len);
568 else {
569 /* Emit just the prefix, then the rest. */
570 emit_line(ecbdata->file, set, reset, line, 1);
571 ws_check_emit(line + 1, len - 1, ecbdata->ws_rule,
572 ecbdata->file, set, reset, ws);
573 }
574 }
575
576 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
577 {
578 const char *cp;
579 unsigned long allot;
580 size_t l = len;
581
582 if (ecb->truncate)
583 return ecb->truncate(line, len);
584 cp = line;
585 allot = l;
586 while (0 < l) {
587 (void) utf8_width(&cp, &l);
588 if (!cp)
589 break; /* truncated in the middle? */
590 }
591 return allot - l;
592 }
593
594 static void find_lno(const char *line, struct emit_callback *ecbdata)
595 {
596 const char *p;
597 ecbdata->lno_in_preimage = 0;
598 ecbdata->lno_in_postimage = 0;
599 p = strchr(line, '-');
600 if (!p)
601 return; /* cannot happen */
602 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
603 p = strchr(p, '+');
604 if (!p)
605 return; /* cannot happen */
606 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
607 }
608
609 static void fn_out_consume(void *priv, char *line, unsigned long len)
610 {
611 struct emit_callback *ecbdata = priv;
612 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
613 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
614 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
615
616 *(ecbdata->found_changesp) = 1;
617
618 if (ecbdata->label_path[0]) {
619 const char *name_a_tab, *name_b_tab;
620
621 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
622 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
623
624 fprintf(ecbdata->file, "%s--- %s%s%s\n",
625 meta, ecbdata->label_path[0], reset, name_a_tab);
626 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
627 meta, ecbdata->label_path[1], reset, name_b_tab);
628 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
629 }
630
631 if (line[0] == '@') {
632 len = sane_truncate_line(ecbdata, line, len);
633 find_lno(line, ecbdata);
634 emit_line(ecbdata->file,
635 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
636 reset, line, len);
637 if (line[len-1] != '\n')
638 putc('\n', ecbdata->file);
639 return;
640 }
641
642 if (len < 1) {
643 emit_line(ecbdata->file, reset, reset, line, len);
644 return;
645 }
646
647 if (ecbdata->diff_words) {
648 if (line[0] == '-') {
649 diff_words_append(line, len,
650 &ecbdata->diff_words->minus);
651 return;
652 } else if (line[0] == '+') {
653 diff_words_append(line, len,
654 &ecbdata->diff_words->plus);
655 return;
656 }
657 if (ecbdata->diff_words->minus.text.size ||
658 ecbdata->diff_words->plus.text.size)
659 diff_words_show(ecbdata->diff_words);
660 line++;
661 len--;
662 emit_line(ecbdata->file, plain, reset, line, len);
663 return;
664 }
665
666 if (line[0] != '+') {
667 const char *color =
668 diff_get_color(ecbdata->color_diff,
669 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
670 ecbdata->lno_in_preimage++;
671 if (line[0] == ' ')
672 ecbdata->lno_in_postimage++;
673 emit_line(ecbdata->file, color, reset, line, len);
674 } else {
675 ecbdata->lno_in_postimage++;
676 emit_add_line(reset, ecbdata, line, len);
677 }
678 }
679
680 static char *pprint_rename(const char *a, const char *b)
681 {
682 const char *old = a;
683 const char *new = b;
684 struct strbuf name;
685 int pfx_length, sfx_length;
686 int len_a = strlen(a);
687 int len_b = strlen(b);
688 int a_midlen, b_midlen;
689 int qlen_a = quote_c_style(a, NULL, NULL, 0);
690 int qlen_b = quote_c_style(b, NULL, NULL, 0);
691
692 strbuf_init(&name, 0);
693 if (qlen_a || qlen_b) {
694 quote_c_style(a, &name, NULL, 0);
695 strbuf_addstr(&name, " => ");
696 quote_c_style(b, &name, NULL, 0);
697 return strbuf_detach(&name, NULL);
698 }
699
700 /* Find common prefix */
701 pfx_length = 0;
702 while (*old && *new && *old == *new) {
703 if (*old == '/')
704 pfx_length = old - a + 1;
705 old++;
706 new++;
707 }
708
709 /* Find common suffix */
710 old = a + len_a;
711 new = b + len_b;
712 sfx_length = 0;
713 while (a <= old && b <= new && *old == *new) {
714 if (*old == '/')
715 sfx_length = len_a - (old - a);
716 old--;
717 new--;
718 }
719
720 /*
721 * pfx{mid-a => mid-b}sfx
722 * {pfx-a => pfx-b}sfx
723 * pfx{sfx-a => sfx-b}
724 * name-a => name-b
725 */
726 a_midlen = len_a - pfx_length - sfx_length;
727 b_midlen = len_b - pfx_length - sfx_length;
728 if (a_midlen < 0)
729 a_midlen = 0;
730 if (b_midlen < 0)
731 b_midlen = 0;
732
733 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
734 if (pfx_length + sfx_length) {
735 strbuf_add(&name, a, pfx_length);
736 strbuf_addch(&name, '{');
737 }
738 strbuf_add(&name, a + pfx_length, a_midlen);
739 strbuf_addstr(&name, " => ");
740 strbuf_add(&name, b + pfx_length, b_midlen);
741 if (pfx_length + sfx_length) {
742 strbuf_addch(&name, '}');
743 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
744 }
745 return strbuf_detach(&name, NULL);
746 }
747
748 struct diffstat_t {
749 struct xdiff_emit_state xm;
750
751 int nr;
752 int alloc;
753 struct diffstat_file {
754 char *from_name;
755 char *name;
756 char *print_name;
757 unsigned is_unmerged:1;
758 unsigned is_binary:1;
759 unsigned is_renamed:1;
760 unsigned int added, deleted;
761 } **files;
762 };
763
764 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
765 const char *name_a,
766 const char *name_b)
767 {
768 struct diffstat_file *x;
769 x = xcalloc(sizeof (*x), 1);
770 if (diffstat->nr == diffstat->alloc) {
771 diffstat->alloc = alloc_nr(diffstat->alloc);
772 diffstat->files = xrealloc(diffstat->files,
773 diffstat->alloc * sizeof(x));
774 }
775 diffstat->files[diffstat->nr++] = x;
776 if (name_b) {
777 x->from_name = xstrdup(name_a);
778 x->name = xstrdup(name_b);
779 x->is_renamed = 1;
780 }
781 else {
782 x->from_name = NULL;
783 x->name = xstrdup(name_a);
784 }
785 return x;
786 }
787
788 static void diffstat_consume(void *priv, char *line, unsigned long len)
789 {
790 struct diffstat_t *diffstat = priv;
791 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
792
793 if (line[0] == '+')
794 x->added++;
795 else if (line[0] == '-')
796 x->deleted++;
797 }
798
799 const char mime_boundary_leader[] = "------------";
800
801 static int scale_linear(int it, int width, int max_change)
802 {
803 /*
804 * make sure that at least one '-' is printed if there were deletions,
805 * and likewise for '+'.
806 */
807 if (max_change < 2)
808 return it;
809 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
810 }
811
812 static void show_name(FILE *file,
813 const char *prefix, const char *name, int len,
814 const char *reset, const char *set)
815 {
816 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
817 }
818
819 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
820 {
821 if (cnt <= 0)
822 return;
823 fprintf(file, "%s", set);
824 while (cnt--)
825 putc(ch, file);
826 fprintf(file, "%s", reset);
827 }
828
829 static void fill_print_name(struct diffstat_file *file)
830 {
831 char *pname;
832
833 if (file->print_name)
834 return;
835
836 if (!file->is_renamed) {
837 struct strbuf buf;
838 strbuf_init(&buf, 0);
839 if (quote_c_style(file->name, &buf, NULL, 0)) {
840 pname = strbuf_detach(&buf, NULL);
841 } else {
842 pname = file->name;
843 strbuf_release(&buf);
844 }
845 } else {
846 pname = pprint_rename(file->from_name, file->name);
847 }
848 file->print_name = pname;
849 }
850
851 static void show_stats(struct diffstat_t* data, struct diff_options *options)
852 {
853 int i, len, add, del, total, adds = 0, dels = 0;
854 int max_change = 0, max_len = 0;
855 int total_files = data->nr;
856 int width, name_width;
857 const char *reset, *set, *add_c, *del_c;
858
859 if (data->nr == 0)
860 return;
861
862 width = options->stat_width ? options->stat_width : 80;
863 name_width = options->stat_name_width ? options->stat_name_width : 50;
864
865 /* Sanity: give at least 5 columns to the graph,
866 * but leave at least 10 columns for the name.
867 */
868 if (width < 25)
869 width = 25;
870 if (name_width < 10)
871 name_width = 10;
872 else if (width < name_width + 15)
873 name_width = width - 15;
874
875 /* Find the longest filename and max number of changes */
876 reset = diff_get_color_opt(options, DIFF_RESET);
877 set = diff_get_color_opt(options, DIFF_PLAIN);
878 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
879 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
880
881 for (i = 0; i < data->nr; i++) {
882 struct diffstat_file *file = data->files[i];
883 int change = file->added + file->deleted;
884 fill_print_name(file);
885 len = strlen(file->print_name);
886 if (max_len < len)
887 max_len = len;
888
889 if (file->is_binary || file->is_unmerged)
890 continue;
891 if (max_change < change)
892 max_change = change;
893 }
894
895 /* Compute the width of the graph part;
896 * 10 is for one blank at the beginning of the line plus
897 * " | count " between the name and the graph.
898 *
899 * From here on, name_width is the width of the name area,
900 * and width is the width of the graph area.
901 */
902 name_width = (name_width < max_len) ? name_width : max_len;
903 if (width < (name_width + 10) + max_change)
904 width = width - (name_width + 10);
905 else
906 width = max_change;
907
908 for (i = 0; i < data->nr; i++) {
909 const char *prefix = "";
910 char *name = data->files[i]->print_name;
911 int added = data->files[i]->added;
912 int deleted = data->files[i]->deleted;
913 int name_len;
914
915 /*
916 * "scale" the filename
917 */
918 len = name_width;
919 name_len = strlen(name);
920 if (name_width < name_len) {
921 char *slash;
922 prefix = "...";
923 len -= 3;
924 name += name_len - len;
925 slash = strchr(name, '/');
926 if (slash)
927 name = slash;
928 }
929
930 if (data->files[i]->is_binary) {
931 show_name(options->file, prefix, name, len, reset, set);
932 fprintf(options->file, " Bin ");
933 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
934 fprintf(options->file, " -> ");
935 fprintf(options->file, "%s%d%s", add_c, added, reset);
936 fprintf(options->file, " bytes");
937 fprintf(options->file, "\n");
938 continue;
939 }
940 else if (data->files[i]->is_unmerged) {
941 show_name(options->file, prefix, name, len, reset, set);
942 fprintf(options->file, " Unmerged\n");
943 continue;
944 }
945 else if (!data->files[i]->is_renamed &&
946 (added + deleted == 0)) {
947 total_files--;
948 continue;
949 }
950
951 /*
952 * scale the add/delete
953 */
954 add = added;
955 del = deleted;
956 total = add + del;
957 adds += add;
958 dels += del;
959
960 if (width <= max_change) {
961 add = scale_linear(add, width, max_change);
962 del = scale_linear(del, width, max_change);
963 total = add + del;
964 }
965 show_name(options->file, prefix, name, len, reset, set);
966 fprintf(options->file, "%5d%s", added + deleted,
967 added + deleted ? " " : "");
968 show_graph(options->file, '+', add, add_c, reset);
969 show_graph(options->file, '-', del, del_c, reset);
970 fprintf(options->file, "\n");
971 }
972 fprintf(options->file,
973 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
974 set, total_files, adds, dels, reset);
975 }
976
977 static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
978 {
979 int i, adds = 0, dels = 0, total_files = data->nr;
980
981 if (data->nr == 0)
982 return;
983
984 for (i = 0; i < data->nr; i++) {
985 if (!data->files[i]->is_binary &&
986 !data->files[i]->is_unmerged) {
987 int added = data->files[i]->added;
988 int deleted= data->files[i]->deleted;
989 if (!data->files[i]->is_renamed &&
990 (added + deleted == 0)) {
991 total_files--;
992 } else {
993 adds += added;
994 dels += deleted;
995 }
996 }
997 }
998 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
999 total_files, adds, dels);
1000 }
1001
1002 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
1003 {
1004 int i;
1005
1006 if (data->nr == 0)
1007 return;
1008
1009 for (i = 0; i < data->nr; i++) {
1010 struct diffstat_file *file = data->files[i];
1011
1012 if (file->is_binary)
1013 fprintf(options->file, "-\t-\t");
1014 else
1015 fprintf(options->file,
1016 "%d\t%d\t", file->added, file->deleted);
1017 if (options->line_termination) {
1018 fill_print_name(file);
1019 if (!file->is_renamed)
1020 write_name_quoted(file->name, options->file,
1021 options->line_termination);
1022 else {
1023 fputs(file->print_name, options->file);
1024 putc(options->line_termination, options->file);
1025 }
1026 } else {
1027 if (file->is_renamed) {
1028 putc('\0', options->file);
1029 write_name_quoted(file->from_name, options->file, '\0');
1030 }
1031 write_name_quoted(file->name, options->file, '\0');
1032 }
1033 }
1034 }
1035
1036 struct dirstat_file {
1037 const char *name;
1038 unsigned long changed;
1039 };
1040
1041 struct dirstat_dir {
1042 struct dirstat_file *files;
1043 int alloc, nr, percent, cumulative;
1044 };
1045
1046 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1047 {
1048 unsigned long this_dir = 0;
1049 unsigned int sources = 0;
1050
1051 while (dir->nr) {
1052 struct dirstat_file *f = dir->files;
1053 int namelen = strlen(f->name);
1054 unsigned long this;
1055 char *slash;
1056
1057 if (namelen < baselen)
1058 break;
1059 if (memcmp(f->name, base, baselen))
1060 break;
1061 slash = strchr(f->name + baselen, '/');
1062 if (slash) {
1063 int newbaselen = slash + 1 - f->name;
1064 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1065 sources++;
1066 } else {
1067 this = f->changed;
1068 dir->files++;
1069 dir->nr--;
1070 sources += 2;
1071 }
1072 this_dir += this;
1073 }
1074
1075 /*
1076 * We don't report dirstat's for
1077 * - the top level
1078 * - or cases where everything came from a single directory
1079 * under this directory (sources == 1).
1080 */
1081 if (baselen && sources != 1) {
1082 int permille = this_dir * 1000 / changed;
1083 if (permille) {
1084 int percent = permille / 10;
1085 if (percent >= dir->percent) {
1086 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1087 if (!dir->cumulative)
1088 return 0;
1089 }
1090 }
1091 }
1092 return this_dir;
1093 }
1094
1095 static int dirstat_compare(const void *_a, const void *_b)
1096 {
1097 const struct dirstat_file *a = _a;
1098 const struct dirstat_file *b = _b;
1099 return strcmp(a->name, b->name);
1100 }
1101
1102 static void show_dirstat(struct diff_options *options)
1103 {
1104 int i;
1105 unsigned long changed;
1106 struct dirstat_dir dir;
1107 struct diff_queue_struct *q = &diff_queued_diff;
1108
1109 dir.files = NULL;
1110 dir.alloc = 0;
1111 dir.nr = 0;
1112 dir.percent = options->dirstat_percent;
1113 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1114
1115 changed = 0;
1116 for (i = 0; i < q->nr; i++) {
1117 struct diff_filepair *p = q->queue[i];
1118 const char *name;
1119 unsigned long copied, added, damage;
1120
1121 name = p->one->path ? p->one->path : p->two->path;
1122
1123 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1124 diff_populate_filespec(p->one, 0);
1125 diff_populate_filespec(p->two, 0);
1126 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1127 &copied, &added);
1128 diff_free_filespec_data(p->one);
1129 diff_free_filespec_data(p->two);
1130 } else if (DIFF_FILE_VALID(p->one)) {
1131 diff_populate_filespec(p->one, 1);
1132 copied = added = 0;
1133 diff_free_filespec_data(p->one);
1134 } else if (DIFF_FILE_VALID(p->two)) {
1135 diff_populate_filespec(p->two, 1);
1136 copied = 0;
1137 added = p->two->size;
1138 diff_free_filespec_data(p->two);
1139 } else
1140 continue;
1141
1142 /*
1143 * Original minus copied is the removed material,
1144 * added is the new material. They are both damages
1145 * made to the preimage.
1146 */
1147 damage = (p->one->size - copied) + added;
1148
1149 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1150 dir.files[dir.nr].name = name;
1151 dir.files[dir.nr].changed = damage;
1152 changed += damage;
1153 dir.nr++;
1154 }
1155
1156 /* This can happen even with many files, if everything was renames */
1157 if (!changed)
1158 return;
1159
1160 /* Show all directories with more than x% of the changes */
1161 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1162 gather_dirstat(options->file, &dir, changed, "", 0);
1163 }
1164
1165 static void free_diffstat_info(struct diffstat_t *diffstat)
1166 {
1167 int i;
1168 for (i = 0; i < diffstat->nr; i++) {
1169 struct diffstat_file *f = diffstat->files[i];
1170 if (f->name != f->print_name)
1171 free(f->print_name);
1172 free(f->name);
1173 free(f->from_name);
1174 free(f);
1175 }
1176 free(diffstat->files);
1177 }
1178
1179 struct checkdiff_t {
1180 struct xdiff_emit_state xm;
1181 const char *filename;
1182 int lineno;
1183 struct diff_options *o;
1184 unsigned ws_rule;
1185 unsigned status;
1186 };
1187
1188 static int is_conflict_marker(const char *line, unsigned long len)
1189 {
1190 char firstchar;
1191 int cnt;
1192
1193 if (len < 8)
1194 return 0;
1195 firstchar = line[0];
1196 switch (firstchar) {
1197 case '=': case '>': case '<':
1198 break;
1199 default:
1200 return 0;
1201 }
1202 for (cnt = 1; cnt < 7; cnt++)
1203 if (line[cnt] != firstchar)
1204 return 0;
1205 /* line[0] thru line[6] are same as firstchar */
1206 if (firstchar == '=') {
1207 /* divider between ours and theirs? */
1208 if (len != 8 || line[7] != '\n')
1209 return 0;
1210 } else if (len < 8 || !isspace(line[7])) {
1211 /* not divider before ours nor after theirs */
1212 return 0;
1213 }
1214 return 1;
1215 }
1216
1217 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1218 {
1219 struct checkdiff_t *data = priv;
1220 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1221 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1222 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1223 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1224 char *err;
1225
1226 if (line[0] == '+') {
1227 unsigned bad;
1228 data->lineno++;
1229 if (is_conflict_marker(line + 1, len - 1)) {
1230 data->status |= 1;
1231 fprintf(data->o->file,
1232 "%s:%d: leftover conflict marker\n",
1233 data->filename, data->lineno);
1234 }
1235 bad = ws_check(line + 1, len - 1, data->ws_rule);
1236 if (!bad)
1237 return;
1238 data->status |= bad;
1239 err = whitespace_error_string(bad);
1240 fprintf(data->o->file, "%s:%d: %s.\n",
1241 data->filename, data->lineno, err);
1242 free(err);
1243 emit_line(data->o->file, set, reset, line, 1);
1244 ws_check_emit(line + 1, len - 1, data->ws_rule,
1245 data->o->file, set, reset, ws);
1246 } else if (line[0] == ' ') {
1247 data->lineno++;
1248 } else if (line[0] == '@') {
1249 char *plus = strchr(line, '+');
1250 if (plus)
1251 data->lineno = strtol(plus, NULL, 10) - 1;
1252 else
1253 die("invalid diff");
1254 }
1255 }
1256
1257 static unsigned char *deflate_it(char *data,
1258 unsigned long size,
1259 unsigned long *result_size)
1260 {
1261 int bound;
1262 unsigned char *deflated;
1263 z_stream stream;
1264
1265 memset(&stream, 0, sizeof(stream));
1266 deflateInit(&stream, zlib_compression_level);
1267 bound = deflateBound(&stream, size);
1268 deflated = xmalloc(bound);
1269 stream.next_out = deflated;
1270 stream.avail_out = bound;
1271
1272 stream.next_in = (unsigned char *)data;
1273 stream.avail_in = size;
1274 while (deflate(&stream, Z_FINISH) == Z_OK)
1275 ; /* nothing */
1276 deflateEnd(&stream);
1277 *result_size = stream.total_out;
1278 return deflated;
1279 }
1280
1281 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1282 {
1283 void *cp;
1284 void *delta;
1285 void *deflated;
1286 void *data;
1287 unsigned long orig_size;
1288 unsigned long delta_size;
1289 unsigned long deflate_size;
1290 unsigned long data_size;
1291
1292 /* We could do deflated delta, or we could do just deflated two,
1293 * whichever is smaller.
1294 */
1295 delta = NULL;
1296 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1297 if (one->size && two->size) {
1298 delta = diff_delta(one->ptr, one->size,
1299 two->ptr, two->size,
1300 &delta_size, deflate_size);
1301 if (delta) {
1302 void *to_free = delta;
1303 orig_size = delta_size;
1304 delta = deflate_it(delta, delta_size, &delta_size);
1305 free(to_free);
1306 }
1307 }
1308
1309 if (delta && delta_size < deflate_size) {
1310 fprintf(file, "delta %lu\n", orig_size);
1311 free(deflated);
1312 data = delta;
1313 data_size = delta_size;
1314 }
1315 else {
1316 fprintf(file, "literal %lu\n", two->size);
1317 free(delta);
1318 data = deflated;
1319 data_size = deflate_size;
1320 }
1321
1322 /* emit data encoded in base85 */
1323 cp = data;
1324 while (data_size) {
1325 int bytes = (52 < data_size) ? 52 : data_size;
1326 char line[70];
1327 data_size -= bytes;
1328 if (bytes <= 26)
1329 line[0] = bytes + 'A' - 1;
1330 else
1331 line[0] = bytes - 26 + 'a' - 1;
1332 encode_85(line + 1, cp, bytes);
1333 cp = (char *) cp + bytes;
1334 fputs(line, file);
1335 fputc('\n', file);
1336 }
1337 fprintf(file, "\n");
1338 free(data);
1339 }
1340
1341 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1342 {
1343 fprintf(file, "GIT binary patch\n");
1344 emit_binary_diff_body(file, one, two);
1345 emit_binary_diff_body(file, two, one);
1346 }
1347
1348 static void setup_diff_attr_check(struct git_attr_check *check)
1349 {
1350 static struct git_attr *attr_diff;
1351
1352 if (!attr_diff) {
1353 attr_diff = git_attr("diff", 4);
1354 }
1355 check[0].attr = attr_diff;
1356 }
1357
1358 static void diff_filespec_check_attr(struct diff_filespec *one)
1359 {
1360 struct git_attr_check attr_diff_check;
1361 int check_from_data = 0;
1362
1363 if (one->checked_attr)
1364 return;
1365
1366 setup_diff_attr_check(&attr_diff_check);
1367 one->is_binary = 0;
1368 one->funcname_pattern_ident = NULL;
1369
1370 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1371 const char *value;
1372
1373 /* binaryness */
1374 value = attr_diff_check.value;
1375 if (ATTR_TRUE(value))
1376 ;
1377 else if (ATTR_FALSE(value))
1378 one->is_binary = 1;
1379 else
1380 check_from_data = 1;
1381
1382 /* funcname pattern ident */
1383 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1384 ;
1385 else
1386 one->funcname_pattern_ident = value;
1387 }
1388
1389 if (check_from_data) {
1390 if (!one->data && DIFF_FILE_VALID(one))
1391 diff_populate_filespec(one, 0);
1392
1393 if (one->data)
1394 one->is_binary = buffer_is_binary(one->data, one->size);
1395 }
1396 }
1397
1398 int diff_filespec_is_binary(struct diff_filespec *one)
1399 {
1400 diff_filespec_check_attr(one);
1401 return one->is_binary;
1402 }
1403
1404 static const struct funcname_pattern_entry *funcname_pattern(const char *ident)
1405 {
1406 struct funcname_pattern_list *pp;
1407
1408 for (pp = funcname_pattern_list; pp; pp = pp->next)
1409 if (!strcmp(ident, pp->e.name))
1410 return &pp->e;
1411 return NULL;
1412 }
1413
1414 static const struct funcname_pattern_entry builtin_funcname_pattern[] = {
1415 { "java",
1416 "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
1417 "^[ \t]*(([ \t]*[A-Za-z_][A-Za-z_0-9]*){2,}[ \t]*\\([^;]*)$",
1418 REG_EXTENDED },
1419 { "pascal",
1420 "^((procedure|function|constructor|destructor|interface|"
1421 "implementation|initialization|finalization)[ \t]*.*)$"
1422 "|"
1423 "^(.*=[ \t]*(class|record).*)$",
1424 REG_EXTENDED },
1425 { "bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
1426 REG_EXTENDED },
1427 { "tex",
1428 "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
1429 REG_EXTENDED },
1430 { "ruby", "^[ \t]*((class|module|def)[ \t].*)$",
1431 REG_EXTENDED },
1432 };
1433
1434 static const struct funcname_pattern_entry *diff_funcname_pattern(struct diff_filespec *one)
1435 {
1436 const char *ident;
1437 const struct funcname_pattern_entry *pe;
1438 int i;
1439
1440 diff_filespec_check_attr(one);
1441 ident = one->funcname_pattern_ident;
1442
1443 if (!ident)
1444 /*
1445 * If the config file has "funcname.default" defined, that
1446 * regexp is used; otherwise NULL is returned and xemit uses
1447 * the built-in default.
1448 */
1449 return funcname_pattern("default");
1450
1451 /* Look up custom "funcname.$ident" regexp from config. */
1452 pe = funcname_pattern(ident);
1453 if (pe)
1454 return pe;
1455
1456 /*
1457 * And define built-in fallback patterns here. Note that
1458 * these can be overridden by the user's config settings.
1459 */
1460 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1461 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1462 return &builtin_funcname_pattern[i];
1463
1464 return NULL;
1465 }
1466
1467 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
1468 {
1469 char *ptr = mf->ptr;
1470 long size = mf->size;
1471 int cnt = 0;
1472
1473 if (!size)
1474 return cnt;
1475 ptr += size - 1; /* pointing at the very end */
1476 if (*ptr != '\n')
1477 ; /* incomplete line */
1478 else
1479 ptr--; /* skip the last LF */
1480 while (mf->ptr < ptr) {
1481 char *prev_eol;
1482 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
1483 if (*prev_eol == '\n')
1484 break;
1485 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
1486 break;
1487 cnt++;
1488 ptr = prev_eol - 1;
1489 }
1490 return cnt;
1491 }
1492
1493 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
1494 struct emit_callback *ecbdata)
1495 {
1496 int l1, l2, at;
1497 unsigned ws_rule = ecbdata->ws_rule;
1498 l1 = count_trailing_blank(mf1, ws_rule);
1499 l2 = count_trailing_blank(mf2, ws_rule);
1500 if (l2 <= l1) {
1501 ecbdata->blank_at_eof_in_preimage = 0;
1502 ecbdata->blank_at_eof_in_postimage = 0;
1503 return;
1504 }
1505 at = count_lines(mf1->ptr, mf1->size);
1506 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
1507
1508 at = count_lines(mf2->ptr, mf2->size);
1509 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
1510 }
1511
1512 static void builtin_diff(const char *name_a,
1513 const char *name_b,
1514 struct diff_filespec *one,
1515 struct diff_filespec *two,
1516 const char *xfrm_msg,
1517 struct diff_options *o,
1518 int complete_rewrite)
1519 {
1520 mmfile_t mf1, mf2;
1521 const char *lbl[2];
1522 char *a_one, *b_two;
1523 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1524 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1525
1526 /* Never use a non-valid filename anywhere if at all possible */
1527 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1528 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1529
1530 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1531 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
1532 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1533 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1534 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1535 if (lbl[0][0] == '/') {
1536 /* /dev/null */
1537 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
1538 if (xfrm_msg && xfrm_msg[0])
1539 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1540 }
1541 else if (lbl[1][0] == '/') {
1542 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1543 if (xfrm_msg && xfrm_msg[0])
1544 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1545 }
1546 else {
1547 if (one->mode != two->mode) {
1548 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1549 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
1550 }
1551 if (xfrm_msg && xfrm_msg[0])
1552 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1553 /*
1554 * we do not run diff between different kind
1555 * of objects.
1556 */
1557 if ((one->mode ^ two->mode) & S_IFMT)
1558 goto free_ab_and_return;
1559 if (complete_rewrite) {
1560 emit_rewrite_diff(name_a, name_b, one, two, o);
1561 o->found_changes = 1;
1562 goto free_ab_and_return;
1563 }
1564 }
1565
1566 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1567 die("unable to read files to diff");
1568
1569 if (!DIFF_OPT_TST(o, TEXT) &&
1570 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1571 /* Quite common confusing case */
1572 if (mf1.size == mf2.size &&
1573 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1574 goto free_ab_and_return;
1575 if (DIFF_OPT_TST(o, BINARY))
1576 emit_binary_diff(o->file, &mf1, &mf2);
1577 else
1578 fprintf(o->file, "Binary files %s and %s differ\n",
1579 lbl[0], lbl[1]);
1580 o->found_changes = 1;
1581 }
1582 else {
1583 /* Crazy xdl interfaces.. */
1584 const char *diffopts = getenv("GIT_DIFF_OPTS");
1585 xpparam_t xpp;
1586 xdemitconf_t xecfg;
1587 xdemitcb_t ecb;
1588 struct emit_callback ecbdata;
1589 const struct funcname_pattern_entry *pe;
1590
1591 pe = diff_funcname_pattern(one);
1592 if (!pe)
1593 pe = diff_funcname_pattern(two);
1594
1595 memset(&xecfg, 0, sizeof(xecfg));
1596 memset(&ecbdata, 0, sizeof(ecbdata));
1597 ecbdata.label_path = lbl;
1598 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1599 ecbdata.found_changesp = &o->found_changes;
1600 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1601 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1602 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1603 ecbdata.file = o->file;
1604 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1605 xecfg.ctxlen = o->context;
1606 xecfg.flags = XDL_EMIT_FUNCNAMES;
1607 if (pe)
1608 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1609 if (!diffopts)
1610 ;
1611 else if (!prefixcmp(diffopts, "--unified="))
1612 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1613 else if (!prefixcmp(diffopts, "-u"))
1614 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1615 ecb.outf = xdiff_outf;
1616 ecb.priv = &ecbdata;
1617 ecbdata.xm.consume = fn_out_consume;
1618 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1619 ecbdata.diff_words =
1620 xcalloc(1, sizeof(struct diff_words_data));
1621 ecbdata.diff_words->file = o->file;
1622 }
1623 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1624 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1625 free_diff_words_data(&ecbdata);
1626 }
1627
1628 free_ab_and_return:
1629 diff_free_filespec_data(one);
1630 diff_free_filespec_data(two);
1631 free(a_one);
1632 free(b_two);
1633 return;
1634 }
1635
1636 static void builtin_diffstat(const char *name_a, const char *name_b,
1637 struct diff_filespec *one,
1638 struct diff_filespec *two,
1639 struct diffstat_t *diffstat,
1640 struct diff_options *o,
1641 int complete_rewrite)
1642 {
1643 mmfile_t mf1, mf2;
1644 struct diffstat_file *data;
1645
1646 data = diffstat_add(diffstat, name_a, name_b);
1647
1648 if (!one || !two) {
1649 data->is_unmerged = 1;
1650 return;
1651 }
1652 if (complete_rewrite) {
1653 diff_populate_filespec(one, 0);
1654 diff_populate_filespec(two, 0);
1655 data->deleted = count_lines(one->data, one->size);
1656 data->added = count_lines(two->data, two->size);
1657 goto free_and_return;
1658 }
1659 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1660 die("unable to read files to diff");
1661
1662 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1663 data->is_binary = 1;
1664 data->added = mf2.size;
1665 data->deleted = mf1.size;
1666 } else {
1667 /* Crazy xdl interfaces.. */
1668 xpparam_t xpp;
1669 xdemitconf_t xecfg;
1670 xdemitcb_t ecb;
1671
1672 memset(&xecfg, 0, sizeof(xecfg));
1673 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1674 ecb.outf = xdiff_outf;
1675 ecb.priv = diffstat;
1676 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1677 }
1678
1679 free_and_return:
1680 diff_free_filespec_data(one);
1681 diff_free_filespec_data(two);
1682 }
1683
1684 static void builtin_checkdiff(const char *name_a, const char *name_b,
1685 const char *attr_path,
1686 struct diff_filespec *one,
1687 struct diff_filespec *two,
1688 struct diff_options *o)
1689 {
1690 mmfile_t mf1, mf2;
1691 struct checkdiff_t data;
1692
1693 if (!two)
1694 return;
1695
1696 memset(&data, 0, sizeof(data));
1697 data.xm.consume = checkdiff_consume;
1698 data.filename = name_b ? name_b : name_a;
1699 data.lineno = 0;
1700 data.o = o;
1701 data.ws_rule = whitespace_rule(attr_path);
1702
1703 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1704 die("unable to read files to diff");
1705
1706 /*
1707 * All the other codepaths check both sides, but not checking
1708 * the "old" side here is deliberate. We are checking the newly
1709 * introduced changes, and as long as the "new" side is text, we
1710 * can and should check what it introduces.
1711 */
1712 if (diff_filespec_is_binary(two))
1713 goto free_and_return;
1714 else {
1715 /* Crazy xdl interfaces.. */
1716 xpparam_t xpp;
1717 xdemitconf_t xecfg;
1718 xdemitcb_t ecb;
1719
1720 memset(&xecfg, 0, sizeof(xecfg));
1721 xecfg.ctxlen = 1; /* at least one context line */
1722 xpp.flags = XDF_NEED_MINIMAL;
1723 ecb.outf = xdiff_outf;
1724 ecb.priv = &data;
1725 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1726
1727 if (data.ws_rule & WS_BLANK_AT_EOF) {
1728 struct emit_callback ecbdata;
1729 int blank_at_eof;
1730
1731 ecbdata.ws_rule = data.ws_rule;
1732 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1733 blank_at_eof = ecbdata.blank_at_eof_in_preimage;
1734
1735 if (blank_at_eof) {
1736 static char *err;
1737 if (!err)
1738 err = whitespace_error_string(WS_BLANK_AT_EOF);
1739 fprintf(o->file, "%s:%d: %s.\n",
1740 data.filename, blank_at_eof, err);
1741 data.status = 1; /* report errors */
1742 }
1743 }
1744 }
1745 free_and_return:
1746 diff_free_filespec_data(one);
1747 diff_free_filespec_data(two);
1748 if (data.status)
1749 DIFF_OPT_SET(o, CHECK_FAILED);
1750 }
1751
1752 struct diff_filespec *alloc_filespec(const char *path)
1753 {
1754 int namelen = strlen(path);
1755 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1756
1757 memset(spec, 0, sizeof(*spec));
1758 spec->path = (char *)(spec + 1);
1759 memcpy(spec->path, path, namelen+1);
1760 spec->count = 1;
1761 return spec;
1762 }
1763
1764 void free_filespec(struct diff_filespec *spec)
1765 {
1766 if (!--spec->count) {
1767 diff_free_filespec_data(spec);
1768 free(spec);
1769 }
1770 }
1771
1772 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1773 unsigned short mode)
1774 {
1775 if (mode) {
1776 spec->mode = canon_mode(mode);
1777 hashcpy(spec->sha1, sha1);
1778 spec->sha1_valid = !is_null_sha1(sha1);
1779 }
1780 }
1781
1782 /*
1783 * Given a name and sha1 pair, if the index tells us the file in
1784 * the work tree has that object contents, return true, so that
1785 * prepare_temp_file() does not have to inflate and extract.
1786 */
1787 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1788 {
1789 struct cache_entry *ce;
1790 struct stat st;
1791 int pos, len;
1792
1793 /* We do not read the cache ourselves here, because the
1794 * benchmark with my previous version that always reads cache
1795 * shows that it makes things worse for diff-tree comparing
1796 * two linux-2.6 kernel trees in an already checked out work
1797 * tree. This is because most diff-tree comparisons deal with
1798 * only a small number of files, while reading the cache is
1799 * expensive for a large project, and its cost outweighs the
1800 * savings we get by not inflating the object to a temporary
1801 * file. Practically, this code only helps when we are used
1802 * by diff-cache --cached, which does read the cache before
1803 * calling us.
1804 */
1805 if (!active_cache)
1806 return 0;
1807
1808 /* We want to avoid the working directory if our caller
1809 * doesn't need the data in a normal file, this system
1810 * is rather slow with its stat/open/mmap/close syscalls,
1811 * and the object is contained in a pack file. The pack
1812 * is probably already open and will be faster to obtain
1813 * the data through than the working directory. Loose
1814 * objects however would tend to be slower as they need
1815 * to be individually opened and inflated.
1816 */
1817 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1818 return 0;
1819
1820 len = strlen(name);
1821 pos = cache_name_pos(name, len);
1822 if (pos < 0)
1823 return 0;
1824 ce = active_cache[pos];
1825
1826 /*
1827 * This is not the sha1 we are looking for, or
1828 * unreusable because it is not a regular file.
1829 */
1830 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1831 return 0;
1832
1833 /*
1834 * If ce matches the file in the work tree, we can reuse it.
1835 */
1836 if (ce_uptodate(ce) ||
1837 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1838 return 1;
1839
1840 return 0;
1841 }
1842
1843 static int populate_from_stdin(struct diff_filespec *s)
1844 {
1845 struct strbuf buf;
1846 size_t size = 0;
1847
1848 strbuf_init(&buf, 0);
1849 if (strbuf_read(&buf, 0, 0) < 0)
1850 return error("error while reading from stdin %s",
1851 strerror(errno));
1852
1853 s->should_munmap = 0;
1854 s->data = strbuf_detach(&buf, &size);
1855 s->size = size;
1856 s->should_free = 1;
1857 return 0;
1858 }
1859
1860 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1861 {
1862 int len;
1863 char *data = xmalloc(100);
1864 len = snprintf(data, 100,
1865 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1866 s->data = data;
1867 s->size = len;
1868 s->should_free = 1;
1869 if (size_only) {
1870 s->data = NULL;
1871 free(data);
1872 }
1873 return 0;
1874 }
1875
1876 /*
1877 * While doing rename detection and pickaxe operation, we may need to
1878 * grab the data for the blob (or file) for our own in-core comparison.
1879 * diff_filespec has data and size fields for this purpose.
1880 */
1881 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1882 {
1883 int err = 0;
1884 if (!DIFF_FILE_VALID(s))
1885 die("internal error: asking to populate invalid file.");
1886 if (S_ISDIR(s->mode))
1887 return -1;
1888
1889 if (s->data)
1890 return 0;
1891
1892 if (size_only && 0 < s->size)
1893 return 0;
1894
1895 if (S_ISGITLINK(s->mode))
1896 return diff_populate_gitlink(s, size_only);
1897
1898 if (!s->sha1_valid ||
1899 reuse_worktree_file(s->path, s->sha1, 0)) {
1900 struct strbuf buf;
1901 struct stat st;
1902 int fd;
1903
1904 if (!strcmp(s->path, "-"))
1905 return populate_from_stdin(s);
1906
1907 if (lstat(s->path, &st) < 0) {
1908 if (errno == ENOENT) {
1909 err_empty:
1910 err = -1;
1911 empty:
1912 s->data = (char *)"";
1913 s->size = 0;
1914 return err;
1915 }
1916 }
1917 s->size = xsize_t(st.st_size);
1918 if (!s->size)
1919 goto empty;
1920 if (size_only)
1921 return 0;
1922 if (S_ISLNK(st.st_mode)) {
1923 int ret;
1924 s->data = xmalloc(s->size);
1925 s->should_free = 1;
1926 ret = readlink(s->path, s->data, s->size);
1927 if (ret < 0) {
1928 free(s->data);
1929 goto err_empty;
1930 }
1931 return 0;
1932 }
1933 fd = open(s->path, O_RDONLY);
1934 if (fd < 0)
1935 goto err_empty;
1936 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1937 close(fd);
1938 s->should_munmap = 1;
1939
1940 /*
1941 * Convert from working tree format to canonical git format
1942 */
1943 strbuf_init(&buf, 0);
1944 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
1945 size_t size = 0;
1946 munmap(s->data, s->size);
1947 s->should_munmap = 0;
1948 s->data = strbuf_detach(&buf, &size);
1949 s->size = size;
1950 s->should_free = 1;
1951 }
1952 }
1953 else {
1954 enum object_type type;
1955 if (size_only)
1956 type = sha1_object_info(s->sha1, &s->size);
1957 else {
1958 s->data = read_sha1_file(s->sha1, &type, &s->size);
1959 s->should_free = 1;
1960 }
1961 }
1962 return 0;
1963 }
1964
1965 void diff_free_filespec_blob(struct diff_filespec *s)
1966 {
1967 if (s->should_free)
1968 free(s->data);
1969 else if (s->should_munmap)
1970 munmap(s->data, s->size);
1971
1972 if (s->should_free || s->should_munmap) {
1973 s->should_free = s->should_munmap = 0;
1974 s->data = NULL;
1975 }
1976 }
1977
1978 void diff_free_filespec_data(struct diff_filespec *s)
1979 {
1980 diff_free_filespec_blob(s);
1981 free(s->cnt_data);
1982 s->cnt_data = NULL;
1983 }
1984
1985 static void prep_temp_blob(struct diff_tempfile *temp,
1986 void *blob,
1987 unsigned long size,
1988 const unsigned char *sha1,
1989 int mode)
1990 {
1991 int fd;
1992
1993 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1994 if (fd < 0)
1995 die("unable to create temp-file: %s", strerror(errno));
1996 if (write_in_full(fd, blob, size) != size)
1997 die("unable to write temp-file");
1998 close(fd);
1999 temp->name = temp->tmp_path;
2000 strcpy(temp->hex, sha1_to_hex(sha1));
2001 temp->hex[40] = 0;
2002 sprintf(temp->mode, "%06o", mode);
2003 }
2004
2005 static void prepare_temp_file(const char *name,
2006 struct diff_tempfile *temp,
2007 struct diff_filespec *one)
2008 {
2009 if (!DIFF_FILE_VALID(one)) {
2010 not_a_valid_file:
2011 /* A '-' entry produces this for file-2, and
2012 * a '+' entry produces this for file-1.
2013 */
2014 temp->name = "/dev/null";
2015 strcpy(temp->hex, ".");
2016 strcpy(temp->mode, ".");
2017 return;
2018 }
2019
2020 if (!one->sha1_valid ||
2021 reuse_worktree_file(name, one->sha1, 1)) {
2022 struct stat st;
2023 if (lstat(name, &st) < 0) {
2024 if (errno == ENOENT)
2025 goto not_a_valid_file;
2026 die("stat(%s): %s", name, strerror(errno));
2027 }
2028 if (S_ISLNK(st.st_mode)) {
2029 int ret;
2030 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
2031 size_t sz = xsize_t(st.st_size);
2032 if (sizeof(buf) <= st.st_size)
2033 die("symlink too long: %s", name);
2034 ret = readlink(name, buf, sz);
2035 if (ret < 0)
2036 die("readlink(%s)", name);
2037 prep_temp_blob(temp, buf, sz,
2038 (one->sha1_valid ?
2039 one->sha1 : null_sha1),
2040 (one->sha1_valid ?
2041 one->mode : S_IFLNK));
2042 }
2043 else {
2044 /* we can borrow from the file in the work tree */
2045 temp->name = name;
2046 if (!one->sha1_valid)
2047 strcpy(temp->hex, sha1_to_hex(null_sha1));
2048 else
2049 strcpy(temp->hex, sha1_to_hex(one->sha1));
2050 /* Even though we may sometimes borrow the
2051 * contents from the work tree, we always want
2052 * one->mode. mode is trustworthy even when
2053 * !(one->sha1_valid), as long as
2054 * DIFF_FILE_VALID(one).
2055 */
2056 sprintf(temp->mode, "%06o", one->mode);
2057 }
2058 return;
2059 }
2060 else {
2061 if (diff_populate_filespec(one, 0))
2062 die("cannot read data blob for %s", one->path);
2063 prep_temp_blob(temp, one->data, one->size,
2064 one->sha1, one->mode);
2065 }
2066 }
2067
2068 static void remove_tempfile(void)
2069 {
2070 int i;
2071
2072 for (i = 0; i < 2; i++)
2073 if (diff_temp[i].name == diff_temp[i].tmp_path) {
2074 unlink(diff_temp[i].name);
2075 diff_temp[i].name = NULL;
2076 }
2077 }
2078
2079 static void remove_tempfile_on_signal(int signo)
2080 {
2081 remove_tempfile();
2082 signal(SIGINT, SIG_DFL);
2083 raise(signo);
2084 }
2085
2086 /* An external diff command takes:
2087 *
2088 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2089 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2090 *
2091 */
2092 static void run_external_diff(const char *pgm,
2093 const char *name,
2094 const char *other,
2095 struct diff_filespec *one,
2096 struct diff_filespec *two,
2097 const char *xfrm_msg,
2098 int complete_rewrite)
2099 {
2100 const char *spawn_arg[10];
2101 struct diff_tempfile *temp = diff_temp;
2102 int retval;
2103 static int atexit_asked = 0;
2104 const char *othername;
2105 const char **arg = &spawn_arg[0];
2106
2107 othername = (other? other : name);
2108 if (one && two) {
2109 prepare_temp_file(name, &temp[0], one);
2110 prepare_temp_file(othername, &temp[1], two);
2111 if (! atexit_asked &&
2112 (temp[0].name == temp[0].tmp_path ||
2113 temp[1].name == temp[1].tmp_path)) {
2114 atexit_asked = 1;
2115 atexit(remove_tempfile);
2116 }
2117 signal(SIGINT, remove_tempfile_on_signal);
2118 }
2119
2120 if (one && two) {
2121 *arg++ = pgm;
2122 *arg++ = name;
2123 *arg++ = temp[0].name;
2124 *arg++ = temp[0].hex;
2125 *arg++ = temp[0].mode;
2126 *arg++ = temp[1].name;
2127 *arg++ = temp[1].hex;
2128 *arg++ = temp[1].mode;
2129 if (other) {
2130 *arg++ = other;
2131 *arg++ = xfrm_msg;
2132 }
2133 } else {
2134 *arg++ = pgm;
2135 *arg++ = name;
2136 }
2137 *arg = NULL;
2138 fflush(NULL);
2139 retval = run_command_v_opt(spawn_arg, 0);
2140 remove_tempfile();
2141 if (retval) {
2142 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2143 exit(1);
2144 }
2145 }
2146
2147 static const char *external_diff_attr(const char *name)
2148 {
2149 struct git_attr_check attr_diff_check;
2150
2151 if (!name)
2152 return NULL;
2153
2154 setup_diff_attr_check(&attr_diff_check);
2155 if (!git_checkattr(name, 1, &attr_diff_check)) {
2156 const char *value = attr_diff_check.value;
2157 if (!ATTR_TRUE(value) &&
2158 !ATTR_FALSE(value) &&
2159 !ATTR_UNSET(value)) {
2160 struct ll_diff_driver *drv;
2161
2162 for (drv = user_diff; drv; drv = drv->next)
2163 if (!strcmp(drv->name, value))
2164 return drv->cmd;
2165 }
2166 }
2167 return NULL;
2168 }
2169
2170 static int similarity_index(struct diff_filepair *p)
2171 {
2172 return p->score * 100 / MAX_SCORE;
2173 }
2174
2175 static void fill_metainfo(struct strbuf *msg,
2176 const char *name,
2177 const char *other,
2178 struct diff_filespec *one,
2179 struct diff_filespec *two,
2180 struct diff_options *o,
2181 struct diff_filepair *p)
2182 {
2183 strbuf_init(msg, PATH_MAX * 2 + 300);
2184 switch (p->status) {
2185 case DIFF_STATUS_COPIED:
2186 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2187 strbuf_addstr(msg, "\ncopy from ");
2188 quote_c_style(name, msg, NULL, 0);
2189 strbuf_addstr(msg, "\ncopy to ");
2190 quote_c_style(other, msg, NULL, 0);
2191 strbuf_addch(msg, '\n');
2192 break;
2193 case DIFF_STATUS_RENAMED:
2194 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2195 strbuf_addstr(msg, "\nrename from ");
2196 quote_c_style(name, msg, NULL, 0);
2197 strbuf_addstr(msg, "\nrename to ");
2198 quote_c_style(other, msg, NULL, 0);
2199 strbuf_addch(msg, '\n');
2200 break;
2201 case DIFF_STATUS_MODIFIED:
2202 if (p->score) {
2203 strbuf_addf(msg, "dissimilarity index %d%%\n",
2204 similarity_index(p));
2205 break;
2206 }
2207 /* fallthru */
2208 default:
2209 /* nothing */
2210 ;
2211 }
2212 if (one && two && hashcmp(one->sha1, two->sha1)) {
2213 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2214
2215 if (DIFF_OPT_TST(o, BINARY)) {
2216 mmfile_t mf;
2217 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2218 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2219 abbrev = 40;
2220 }
2221 strbuf_addf(msg, "index %.*s..%.*s",
2222 abbrev, sha1_to_hex(one->sha1),
2223 abbrev, sha1_to_hex(two->sha1));
2224 if (one->mode == two->mode)
2225 strbuf_addf(msg, " %06o", one->mode);
2226 strbuf_addch(msg, '\n');
2227 }
2228 if (msg->len)
2229 strbuf_setlen(msg, msg->len - 1);
2230 }
2231
2232 static void run_diff_cmd(const char *pgm,
2233 const char *name,
2234 const char *other,
2235 const char *attr_path,
2236 struct diff_filespec *one,
2237 struct diff_filespec *two,
2238 struct strbuf *msg,
2239 struct diff_options *o,
2240 struct diff_filepair *p)
2241 {
2242 const char *xfrm_msg = NULL;
2243 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2244
2245 if (msg) {
2246 fill_metainfo(msg, name, other, one, two, o, p);
2247 xfrm_msg = msg->len ? msg->buf : NULL;
2248 }
2249
2250 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2251 pgm = NULL;
2252 else {
2253 const char *cmd = external_diff_attr(attr_path);
2254 if (cmd)
2255 pgm = cmd;
2256 }
2257
2258 if (pgm) {
2259 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2260 complete_rewrite);
2261 return;
2262 }
2263 if (one && two)
2264 builtin_diff(name, other ? other : name,
2265 one, two, xfrm_msg, o, complete_rewrite);
2266 else
2267 fprintf(o->file, "* Unmerged path %s\n", name);
2268 }
2269
2270 static void diff_fill_sha1_info(struct diff_filespec *one)
2271 {
2272 if (DIFF_FILE_VALID(one)) {
2273 if (!one->sha1_valid) {
2274 struct stat st;
2275 if (!strcmp(one->path, "-")) {
2276 hashcpy(one->sha1, null_sha1);
2277 return;
2278 }
2279 if (lstat(one->path, &st) < 0)
2280 die("stat %s", one->path);
2281 if (index_path(one->sha1, one->path, &st, 0))
2282 die("cannot hash %s\n", one->path);
2283 }
2284 }
2285 else
2286 hashclr(one->sha1);
2287 }
2288
2289 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2290 {
2291 /* Strip the prefix but do not molest /dev/null and absolute paths */
2292 if (*namep && **namep != '/')
2293 *namep += prefix_length;
2294 if (*otherp && **otherp != '/')
2295 *otherp += prefix_length;
2296 }
2297
2298 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2299 {
2300 const char *pgm = external_diff();
2301 struct strbuf msg;
2302 struct diff_filespec *one = p->one;
2303 struct diff_filespec *two = p->two;
2304 const char *name;
2305 const char *other;
2306 const char *attr_path;
2307
2308 name = p->one->path;
2309 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2310 attr_path = name;
2311 if (o->prefix_length)
2312 strip_prefix(o->prefix_length, &name, &other);
2313
2314 if (DIFF_PAIR_UNMERGED(p)) {
2315 run_diff_cmd(pgm, name, NULL, attr_path,
2316 NULL, NULL, NULL, o, p);
2317 return;
2318 }
2319
2320 diff_fill_sha1_info(one);
2321 diff_fill_sha1_info(two);
2322
2323 if (!pgm &&
2324 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2325 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2326 /*
2327 * a filepair that changes between file and symlink
2328 * needs to be split into deletion and creation.
2329 */
2330 struct diff_filespec *null = alloc_filespec(two->path);
2331 run_diff_cmd(NULL, name, other, attr_path,
2332 one, null, &msg, o, p);
2333 free(null);
2334 strbuf_release(&msg);
2335
2336 null = alloc_filespec(one->path);
2337 run_diff_cmd(NULL, name, other, attr_path,
2338 null, two, &msg, o, p);
2339 free(null);
2340 }
2341 else
2342 run_diff_cmd(pgm, name, other, attr_path,
2343 one, two, &msg, o, p);
2344
2345 strbuf_release(&msg);
2346 }
2347
2348 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2349 struct diffstat_t *diffstat)
2350 {
2351 const char *name;
2352 const char *other;
2353 int complete_rewrite = 0;
2354
2355 if (DIFF_PAIR_UNMERGED(p)) {
2356 /* unmerged */
2357 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2358 return;
2359 }
2360
2361 name = p->one->path;
2362 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2363
2364 if (o->prefix_length)
2365 strip_prefix(o->prefix_length, &name, &other);
2366
2367 diff_fill_sha1_info(p->one);
2368 diff_fill_sha1_info(p->two);
2369
2370 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2371 complete_rewrite = 1;
2372 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2373 }
2374
2375 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2376 {
2377 const char *name;
2378 const char *other;
2379 const char *attr_path;
2380
2381 if (DIFF_PAIR_UNMERGED(p)) {
2382 /* unmerged */
2383 return;
2384 }
2385
2386 name = p->one->path;
2387 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2388 attr_path = other ? other : name;
2389
2390 if (o->prefix_length)
2391 strip_prefix(o->prefix_length, &name, &other);
2392
2393 diff_fill_sha1_info(p->one);
2394 diff_fill_sha1_info(p->two);
2395
2396 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2397 }
2398
2399 void diff_setup(struct diff_options *options)
2400 {
2401 memset(options, 0, sizeof(*options));
2402
2403 options->file = stdout;
2404
2405 options->line_termination = '\n';
2406 options->break_opt = -1;
2407 options->rename_limit = -1;
2408 options->dirstat_percent = 3;
2409 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
2410 options->context = 3;
2411
2412 options->change = diff_change;
2413 options->add_remove = diff_addremove;
2414 if (diff_use_color_default > 0)
2415 DIFF_OPT_SET(options, COLOR_DIFF);
2416 else
2417 DIFF_OPT_CLR(options, COLOR_DIFF);
2418 options->detect_rename = diff_detect_rename_default;
2419
2420 options->a_prefix = "a/";
2421 options->b_prefix = "b/";
2422 }
2423
2424 int diff_setup_done(struct diff_options *options)
2425 {
2426 int count = 0;
2427
2428 if (options->output_format & DIFF_FORMAT_NAME)
2429 count++;
2430 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2431 count++;
2432 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2433 count++;
2434 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2435 count++;
2436 if (count > 1)
2437 die("--name-only, --name-status, --check and -s are mutually exclusive");
2438
2439 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2440 options->detect_rename = DIFF_DETECT_COPY;
2441
2442 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2443 options->prefix = NULL;
2444 if (options->prefix)
2445 options->prefix_length = strlen(options->prefix);
2446 else
2447 options->prefix_length = 0;
2448
2449 if (options->output_format & (DIFF_FORMAT_NAME |
2450 DIFF_FORMAT_NAME_STATUS |
2451 DIFF_FORMAT_CHECKDIFF |
2452 DIFF_FORMAT_NO_OUTPUT))
2453 options->output_format &= ~(DIFF_FORMAT_RAW |
2454 DIFF_FORMAT_NUMSTAT |
2455 DIFF_FORMAT_DIFFSTAT |
2456 DIFF_FORMAT_SHORTSTAT |
2457 DIFF_FORMAT_DIRSTAT |
2458 DIFF_FORMAT_SUMMARY |
2459 DIFF_FORMAT_PATCH);
2460
2461 /*
2462 * These cases always need recursive; we do not drop caller-supplied
2463 * recursive bits for other formats here.
2464 */
2465 if (options->output_format & (DIFF_FORMAT_PATCH |
2466 DIFF_FORMAT_NUMSTAT |
2467 DIFF_FORMAT_DIFFSTAT |
2468 DIFF_FORMAT_SHORTSTAT |
2469 DIFF_FORMAT_DIRSTAT |
2470 DIFF_FORMAT_SUMMARY |
2471 DIFF_FORMAT_CHECKDIFF))
2472 DIFF_OPT_SET(options, RECURSIVE);
2473 /*
2474 * Also pickaxe would not work very well if you do not say recursive
2475 */
2476 if (options->pickaxe)
2477 DIFF_OPT_SET(options, RECURSIVE);
2478
2479 if (options->detect_rename && options->rename_limit < 0)
2480 options->rename_limit = diff_rename_limit_default;
2481 if (options->setup & DIFF_SETUP_USE_CACHE) {
2482 if (!active_cache)
2483 /* read-cache does not die even when it fails
2484 * so it is safe for us to do this here. Also
2485 * it does not smudge active_cache or active_nr
2486 * when it fails, so we do not have to worry about
2487 * cleaning it up ourselves either.
2488 */
2489 read_cache();
2490 }
2491 if (options->abbrev <= 0 || 40 < options->abbrev)
2492 options->abbrev = 40; /* full */
2493
2494 /*
2495 * It does not make sense to show the first hit we happened
2496 * to have found. It does not make sense not to return with
2497 * exit code in such a case either.
2498 */
2499 if (DIFF_OPT_TST(options, QUIET)) {
2500 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2501 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2502 }
2503
2504 return 0;
2505 }
2506
2507 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2508 {
2509 char c, *eq;
2510 int len;
2511
2512 if (*arg != '-')
2513 return 0;
2514 c = *++arg;
2515 if (!c)
2516 return 0;
2517 if (c == arg_short) {
2518 c = *++arg;
2519 if (!c)
2520 return 1;
2521 if (val && isdigit(c)) {
2522 char *end;
2523 int n = strtoul(arg, &end, 10);
2524 if (*end)
2525 return 0;
2526 *val = n;
2527 return 1;
2528 }
2529 return 0;
2530 }
2531 if (c != '-')
2532 return 0;
2533 arg++;
2534 eq = strchr(arg, '=');
2535 if (eq)
2536 len = eq - arg;
2537 else
2538 len = strlen(arg);
2539 if (!len || strncmp(arg, arg_long, len))
2540 return 0;
2541 if (eq) {
2542 int n;
2543 char *end;
2544 if (!isdigit(*++eq))
2545 return 0;
2546 n = strtoul(eq, &end, 10);
2547 if (*end)
2548 return 0;
2549 *val = n;
2550 }
2551 return 1;
2552 }
2553
2554 static int diff_scoreopt_parse(const char *opt);
2555
2556 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2557 {
2558 const char *arg = av[0];
2559
2560 /* Output format options */
2561 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2562 options->output_format |= DIFF_FORMAT_PATCH;
2563 else if (opt_arg(arg, 'U', "unified", &options->context))
2564 options->output_format |= DIFF_FORMAT_PATCH;
2565 else if (!strcmp(arg, "--raw"))
2566 options->output_format |= DIFF_FORMAT_RAW;
2567 else if (!strcmp(arg, "--patch-with-raw"))
2568 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2569 else if (!strcmp(arg, "--numstat"))
2570 options->output_format |= DIFF_FORMAT_NUMSTAT;
2571 else if (!strcmp(arg, "--shortstat"))
2572 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2573 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2574 options->output_format |= DIFF_FORMAT_DIRSTAT;
2575 else if (!strcmp(arg, "--cumulative")) {
2576 options->output_format |= DIFF_FORMAT_DIRSTAT;
2577 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2578 }
2579 else if (!strcmp(arg, "--check"))
2580 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2581 else if (!strcmp(arg, "--summary"))
2582 options->output_format |= DIFF_FORMAT_SUMMARY;
2583 else if (!strcmp(arg, "--patch-with-stat"))
2584 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2585 else if (!strcmp(arg, "--name-only"))
2586 options->output_format |= DIFF_FORMAT_NAME;
2587 else if (!strcmp(arg, "--name-status"))
2588 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2589 else if (!strcmp(arg, "-s"))
2590 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2591 else if (!prefixcmp(arg, "--stat")) {
2592 char *end;
2593 int width = options->stat_width;
2594 int name_width = options->stat_name_width;
2595 arg += 6;
2596 end = (char *)arg;
2597
2598 switch (*arg) {
2599 case '-':
2600 if (!prefixcmp(arg, "-width="))
2601 width = strtoul(arg + 7, &end, 10);
2602 else if (!prefixcmp(arg, "-name-width="))
2603 name_width = strtoul(arg + 12, &end, 10);
2604 break;
2605 case '=':
2606 width = strtoul(arg+1, &end, 10);
2607 if (*end == ',')
2608 name_width = strtoul(end+1, &end, 10);
2609 }
2610
2611 /* Important! This checks all the error cases! */
2612 if (*end)
2613 return 0;
2614 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2615 options->stat_name_width = name_width;
2616 options->stat_width = width;
2617 }
2618
2619 /* renames options */
2620 else if (!prefixcmp(arg, "-B")) {
2621 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2622 return -1;
2623 }
2624 else if (!prefixcmp(arg, "-M")) {
2625 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2626 return -1;
2627 options->detect_rename = DIFF_DETECT_RENAME;
2628 }
2629 else if (!prefixcmp(arg, "-C")) {
2630 if (options->detect_rename == DIFF_DETECT_COPY)
2631 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2632 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2633 return -1;
2634 options->detect_rename = DIFF_DETECT_COPY;
2635 }
2636 else if (!strcmp(arg, "--no-renames"))
2637 options->detect_rename = 0;
2638 else if (!strcmp(arg, "--relative"))
2639 DIFF_OPT_SET(options, RELATIVE_NAME);
2640 else if (!prefixcmp(arg, "--relative=")) {
2641 DIFF_OPT_SET(options, RELATIVE_NAME);
2642 options->prefix = arg + 11;
2643 }
2644
2645 /* xdiff options */
2646 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2647 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2648 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2649 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2650 else if (!strcmp(arg, "--ignore-space-at-eol"))
2651 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2652
2653 /* flags options */
2654 else if (!strcmp(arg, "--binary")) {
2655 options->output_format |= DIFF_FORMAT_PATCH;
2656 DIFF_OPT_SET(options, BINARY);
2657 }
2658 else if (!strcmp(arg, "--full-index"))
2659 DIFF_OPT_SET(options, FULL_INDEX);
2660 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2661 DIFF_OPT_SET(options, TEXT);
2662 else if (!strcmp(arg, "-R"))
2663 DIFF_OPT_SET(options, REVERSE_DIFF);
2664 else if (!strcmp(arg, "--find-copies-harder"))
2665 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2666 else if (!strcmp(arg, "--follow"))
2667 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2668 else if (!strcmp(arg, "--color"))
2669 DIFF_OPT_SET(options, COLOR_DIFF);
2670 else if (!strcmp(arg, "--no-color"))
2671 DIFF_OPT_CLR(options, COLOR_DIFF);
2672 else if (!strcmp(arg, "--color-words"))
2673 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2674 else if (!strcmp(arg, "--exit-code"))
2675 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2676 else if (!strcmp(arg, "--quiet"))
2677 DIFF_OPT_SET(options, QUIET);
2678 else if (!strcmp(arg, "--ext-diff"))
2679 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2680 else if (!strcmp(arg, "--no-ext-diff"))
2681 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2682 else if (!strcmp(arg, "--ignore-submodules"))
2683 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2684
2685 /* misc options */
2686 else if (!strcmp(arg, "-z"))
2687 options->line_termination = 0;
2688 else if (!prefixcmp(arg, "-l"))
2689 options->rename_limit = strtoul(arg+2, NULL, 10);
2690 else if (!prefixcmp(arg, "-S"))
2691 options->pickaxe = arg + 2;
2692 else if (!strcmp(arg, "--pickaxe-all"))
2693 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2694 else if (!strcmp(arg, "--pickaxe-regex"))
2695 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2696 else if (!prefixcmp(arg, "-O"))
2697 options->orderfile = arg + 2;
2698 else if (!prefixcmp(arg, "--diff-filter="))
2699 options->filter = arg + 14;
2700 else if (!strcmp(arg, "--abbrev"))
2701 options->abbrev = DEFAULT_ABBREV;
2702 else if (!prefixcmp(arg, "--abbrev=")) {
2703 options->abbrev = strtoul(arg + 9, NULL, 10);
2704 if (options->abbrev < MINIMUM_ABBREV)
2705 options->abbrev = MINIMUM_ABBREV;
2706 else if (40 < options->abbrev)
2707 options->abbrev = 40;
2708 }
2709 else if (!prefixcmp(arg, "--src-prefix="))
2710 options->a_prefix = arg + 13;
2711 else if (!prefixcmp(arg, "--dst-prefix="))
2712 options->b_prefix = arg + 13;
2713 else if (!strcmp(arg, "--no-prefix"))
2714 options->a_prefix = options->b_prefix = "";
2715 else if (!prefixcmp(arg, "--output=")) {
2716 options->file = fopen(arg + strlen("--output="), "w");
2717 options->close_file = 1;
2718 } else
2719 return 0;
2720 return 1;
2721 }
2722
2723 static int parse_num(const char **cp_p)
2724 {
2725 unsigned long num, scale;
2726 int ch, dot;
2727 const char *cp = *cp_p;
2728
2729 num = 0;
2730 scale = 1;
2731 dot = 0;
2732 for(;;) {
2733 ch = *cp;
2734 if ( !dot && ch == '.' ) {
2735 scale = 1;
2736 dot = 1;
2737 } else if ( ch == '%' ) {
2738 scale = dot ? scale*100 : 100;
2739 cp++; /* % is always at the end */
2740 break;
2741 } else if ( ch >= '0' && ch <= '9' ) {
2742 if ( scale < 100000 ) {
2743 scale *= 10;
2744 num = (num*10) + (ch-'0');
2745 }
2746 } else {
2747 break;
2748 }
2749 cp++;
2750 }
2751 *cp_p = cp;
2752
2753 /* user says num divided by scale and we say internally that
2754 * is MAX_SCORE * num / scale.
2755 */
2756 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2757 }
2758
2759 static int diff_scoreopt_parse(const char *opt)
2760 {
2761 int opt1, opt2, cmd;
2762
2763 if (*opt++ != '-')
2764 return -1;
2765 cmd = *opt++;
2766 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2767 return -1; /* that is not a -M, -C nor -B option */
2768
2769 opt1 = parse_num(&opt);
2770 if (cmd != 'B')
2771 opt2 = 0;
2772 else {
2773 if (*opt == 0)
2774 opt2 = 0;
2775 else if (*opt != '/')
2776 return -1; /* we expect -B80/99 or -B80 */
2777 else {
2778 opt++;
2779 opt2 = parse_num(&opt);
2780 }
2781 }
2782 if (*opt != 0)
2783 return -1;
2784 return opt1 | (opt2 << 16);
2785 }
2786
2787 struct diff_queue_struct diff_queued_diff;
2788
2789 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2790 {
2791 if (queue->alloc <= queue->nr) {
2792 queue->alloc = alloc_nr(queue->alloc);
2793 queue->queue = xrealloc(queue->queue,
2794 sizeof(dp) * queue->alloc);
2795 }
2796 queue->queue[queue->nr++] = dp;
2797 }
2798
2799 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2800 struct diff_filespec *one,
2801 struct diff_filespec *two)
2802 {
2803 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2804 dp->one = one;
2805 dp->two = two;
2806 if (queue)
2807 diff_q(queue, dp);
2808 return dp;
2809 }
2810
2811 void diff_free_filepair(struct diff_filepair *p)
2812 {
2813 free_filespec(p->one);
2814 free_filespec(p->two);
2815 free(p);
2816 }
2817
2818 /* This is different from find_unique_abbrev() in that
2819 * it stuffs the result with dots for alignment.
2820 */
2821 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2822 {
2823 int abblen;
2824 const char *abbrev;
2825 if (len == 40)
2826 return sha1_to_hex(sha1);
2827
2828 abbrev = find_unique_abbrev(sha1, len);
2829 abblen = strlen(abbrev);
2830 if (abblen < 37) {
2831 static char hex[41];
2832 if (len < abblen && abblen <= len + 2)
2833 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2834 else
2835 sprintf(hex, "%s...", abbrev);
2836 return hex;
2837 }
2838 return sha1_to_hex(sha1);
2839 }
2840
2841 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2842 {
2843 int line_termination = opt->line_termination;
2844 int inter_name_termination = line_termination ? '\t' : '\0';
2845
2846 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2847 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2848 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2849 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2850 }
2851 if (p->score) {
2852 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2853 inter_name_termination);
2854 } else {
2855 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2856 }
2857
2858 if (p->status == DIFF_STATUS_COPIED ||
2859 p->status == DIFF_STATUS_RENAMED) {
2860 const char *name_a, *name_b;
2861 name_a = p->one->path;
2862 name_b = p->two->path;
2863 strip_prefix(opt->prefix_length, &name_a, &name_b);
2864 write_name_quoted(name_a, opt->file, inter_name_termination);
2865 write_name_quoted(name_b, opt->file, line_termination);
2866 } else {
2867 const char *name_a, *name_b;
2868 name_a = p->one->mode ? p->one->path : p->two->path;
2869 name_b = NULL;
2870 strip_prefix(opt->prefix_length, &name_a, &name_b);
2871 write_name_quoted(name_a, opt->file, line_termination);
2872 }
2873 }
2874
2875 int diff_unmodified_pair(struct diff_filepair *p)
2876 {
2877 /* This function is written stricter than necessary to support
2878 * the currently implemented transformers, but the idea is to
2879 * let transformers to produce diff_filepairs any way they want,
2880 * and filter and clean them up here before producing the output.
2881 */
2882 struct diff_filespec *one = p->one, *two = p->two;
2883
2884 if (DIFF_PAIR_UNMERGED(p))
2885 return 0; /* unmerged is interesting */
2886
2887 /* deletion, addition, mode or type change
2888 * and rename are all interesting.
2889 */
2890 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2891 DIFF_PAIR_MODE_CHANGED(p) ||
2892 strcmp(one->path, two->path))
2893 return 0;
2894
2895 /* both are valid and point at the same path. that is, we are
2896 * dealing with a change.
2897 */
2898 if (one->sha1_valid && two->sha1_valid &&
2899 !hashcmp(one->sha1, two->sha1))
2900 return 1; /* no change */
2901 if (!one->sha1_valid && !two->sha1_valid)
2902 return 1; /* both look at the same file on the filesystem. */
2903 return 0;
2904 }
2905
2906 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2907 {
2908 if (diff_unmodified_pair(p))
2909 return;
2910
2911 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2912 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2913 return; /* no tree diffs in patch format */
2914
2915 run_diff(p, o);
2916 }
2917
2918 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2919 struct diffstat_t *diffstat)
2920 {
2921 if (diff_unmodified_pair(p))
2922 return;
2923
2924 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2925 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2926 return; /* no tree diffs in patch format */
2927
2928 run_diffstat(p, o, diffstat);
2929 }
2930
2931 static void diff_flush_checkdiff(struct diff_filepair *p,
2932 struct diff_options *o)
2933 {
2934 if (diff_unmodified_pair(p))
2935 return;
2936
2937 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2938 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2939 return; /* no tree diffs in patch format */
2940
2941 run_checkdiff(p, o);
2942 }
2943
2944 int diff_queue_is_empty(void)
2945 {
2946 struct diff_queue_struct *q = &diff_queued_diff;
2947 int i;
2948 for (i = 0; i < q->nr; i++)
2949 if (!diff_unmodified_pair(q->queue[i]))
2950 return 0;
2951 return 1;
2952 }
2953
2954 #if DIFF_DEBUG
2955 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2956 {
2957 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2958 x, one ? one : "",
2959 s->path,
2960 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2961 s->mode,
2962 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2963 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2964 x, one ? one : "",
2965 s->size, s->xfrm_flags);
2966 }
2967
2968 void diff_debug_filepair(const struct diff_filepair *p, int i)
2969 {
2970 diff_debug_filespec(p->one, i, "one");
2971 diff_debug_filespec(p->two, i, "two");
2972 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2973 p->score, p->status ? p->status : '?',
2974 p->one->rename_used, p->broken_pair);
2975 }
2976
2977 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2978 {
2979 int i;
2980 if (msg)
2981 fprintf(stderr, "%s\n", msg);
2982 fprintf(stderr, "q->nr = %d\n", q->nr);
2983 for (i = 0; i < q->nr; i++) {
2984 struct diff_filepair *p = q->queue[i];
2985 diff_debug_filepair(p, i);
2986 }
2987 }
2988 #endif
2989
2990 static void diff_resolve_rename_copy(void)
2991 {
2992 int i;
2993 struct diff_filepair *p;
2994 struct diff_queue_struct *q = &diff_queued_diff;
2995
2996 diff_debug_queue("resolve-rename-copy", q);
2997
2998 for (i = 0; i < q->nr; i++) {
2999 p = q->queue[i];
3000 p->status = 0; /* undecided */
3001 if (DIFF_PAIR_UNMERGED(p))
3002 p->status = DIFF_STATUS_UNMERGED;
3003 else if (!DIFF_FILE_VALID(p->one))
3004 p->status = DIFF_STATUS_ADDED;
3005 else if (!DIFF_FILE_VALID(p->two))
3006 p->status = DIFF_STATUS_DELETED;
3007 else if (DIFF_PAIR_TYPE_CHANGED(p))
3008 p->status = DIFF_STATUS_TYPE_CHANGED;
3009
3010 /* from this point on, we are dealing with a pair
3011 * whose both sides are valid and of the same type, i.e.
3012 * either in-place edit or rename/copy edit.
3013 */
3014 else if (DIFF_PAIR_RENAME(p)) {
3015 /*
3016 * A rename might have re-connected a broken
3017 * pair up, causing the pathnames to be the
3018 * same again. If so, that's not a rename at
3019 * all, just a modification..
3020 *
3021 * Otherwise, see if this source was used for
3022 * multiple renames, in which case we decrement
3023 * the count, and call it a copy.
3024 */
3025 if (!strcmp(p->one->path, p->two->path))
3026 p->status = DIFF_STATUS_MODIFIED;
3027 else if (--p->one->rename_used > 0)
3028 p->status = DIFF_STATUS_COPIED;
3029 else
3030 p->status = DIFF_STATUS_RENAMED;
3031 }
3032 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3033 p->one->mode != p->two->mode ||
3034 is_null_sha1(p->one->sha1))
3035 p->status = DIFF_STATUS_MODIFIED;
3036 else {
3037 /* This is a "no-change" entry and should not
3038 * happen anymore, but prepare for broken callers.
3039 */
3040 error("feeding unmodified %s to diffcore",
3041 p->one->path);
3042 p->status = DIFF_STATUS_UNKNOWN;
3043 }
3044 }
3045 diff_debug_queue("resolve-rename-copy done", q);
3046 }
3047
3048 static int check_pair_status(struct diff_filepair *p)
3049 {
3050 switch (p->status) {
3051 case DIFF_STATUS_UNKNOWN:
3052 return 0;
3053 case 0:
3054 die("internal error in diff-resolve-rename-copy");
3055 default:
3056 return 1;
3057 }
3058 }
3059
3060 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3061 {
3062 int fmt = opt->output_format;
3063
3064 if (fmt & DIFF_FORMAT_CHECKDIFF)
3065 diff_flush_checkdiff(p, opt);
3066 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3067 diff_flush_raw(p, opt);
3068 else if (fmt & DIFF_FORMAT_NAME) {
3069 const char *name_a, *name_b;
3070 name_a = p->two->path;
3071 name_b = NULL;
3072 strip_prefix(opt->prefix_length, &name_a, &name_b);
3073 write_name_quoted(name_a, opt->file, opt->line_termination);
3074 }
3075 }
3076
3077 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3078 {
3079 if (fs->mode)
3080 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3081 else
3082 fprintf(file, " %s ", newdelete);
3083 write_name_quoted(fs->path, file, '\n');
3084 }
3085
3086
3087 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
3088 {
3089 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3090 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
3091 show_name ? ' ' : '\n');
3092 if (show_name) {
3093 write_name_quoted(p->two->path, file, '\n');
3094 }
3095 }
3096 }
3097
3098 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
3099 {
3100 char *names = pprint_rename(p->one->path, p->two->path);
3101
3102 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3103 free(names);
3104 show_mode_change(file, p, 0);
3105 }
3106
3107 static void diff_summary(FILE *file, struct diff_filepair *p)
3108 {
3109 switch(p->status) {
3110 case DIFF_STATUS_DELETED:
3111 show_file_mode_name(file, "delete", p->one);
3112 break;
3113 case DIFF_STATUS_ADDED:
3114 show_file_mode_name(file, "create", p->two);
3115 break;
3116 case DIFF_STATUS_COPIED:
3117 show_rename_copy(file, "copy", p);
3118 break;
3119 case DIFF_STATUS_RENAMED:
3120 show_rename_copy(file, "rename", p);
3121 break;
3122 default:
3123 if (p->score) {
3124 fputs(" rewrite ", file);
3125 write_name_quoted(p->two->path, file, ' ');
3126 fprintf(file, "(%d%%)\n", similarity_index(p));
3127 }
3128 show_mode_change(file, p, !p->score);
3129 break;
3130 }
3131 }
3132
3133 struct patch_id_t {
3134 struct xdiff_emit_state xm;
3135 SHA_CTX *ctx;
3136 int patchlen;
3137 };
3138
3139 static int remove_space(char *line, int len)
3140 {
3141 int i;
3142 char *dst = line;
3143 unsigned char c;
3144
3145 for (i = 0; i < len; i++)
3146 if (!isspace((c = line[i])))
3147 *dst++ = c;
3148
3149 return dst - line;
3150 }
3151
3152 static void patch_id_consume(void *priv, char *line, unsigned long len)
3153 {
3154 struct patch_id_t *data = priv;
3155 int new_len;
3156
3157 /* Ignore line numbers when computing the SHA1 of the patch */
3158 if (!prefixcmp(line, "@@ -"))
3159 return;
3160
3161 new_len = remove_space(line, len);
3162
3163 SHA1_Update(data->ctx, line, new_len);
3164 data->patchlen += new_len;
3165 }
3166
3167 /* returns 0 upon success, and writes result into sha1 */
3168 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3169 {
3170 struct diff_queue_struct *q = &diff_queued_diff;
3171 int i;
3172 SHA_CTX ctx;
3173 struct patch_id_t data;
3174 char buffer[PATH_MAX * 4 + 20];
3175
3176 SHA1_Init(&ctx);
3177 memset(&data, 0, sizeof(struct patch_id_t));
3178 data.ctx = &ctx;
3179 data.xm.consume = patch_id_consume;
3180
3181 for (i = 0; i < q->nr; i++) {
3182 xpparam_t xpp;
3183 xdemitconf_t xecfg;
3184 xdemitcb_t ecb;
3185 mmfile_t mf1, mf2;
3186 struct diff_filepair *p = q->queue[i];
3187 int len1, len2;
3188
3189 memset(&xecfg, 0, sizeof(xecfg));
3190 if (p->status == 0)
3191 return error("internal diff status error");
3192 if (p->status == DIFF_STATUS_UNKNOWN)
3193 continue;
3194 if (diff_unmodified_pair(p))
3195 continue;
3196 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3197 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3198 continue;
3199 if (DIFF_PAIR_UNMERGED(p))
3200 continue;
3201
3202 diff_fill_sha1_info(p->one);
3203 diff_fill_sha1_info(p->two);
3204 if (fill_mmfile(&mf1, p->one) < 0 ||
3205 fill_mmfile(&mf2, p->two) < 0)
3206 return error("unable to read files to diff");
3207
3208 len1 = remove_space(p->one->path, strlen(p->one->path));
3209 len2 = remove_space(p->two->path, strlen(p->two->path));
3210 if (p->one->mode == 0)
3211 len1 = snprintf(buffer, sizeof(buffer),
3212 "diff--gita/%.*sb/%.*s"
3213 "newfilemode%06o"
3214 "---/dev/null"
3215 "+++b/%.*s",
3216 len1, p->one->path,
3217 len2, p->two->path,
3218 p->two->mode,
3219 len2, p->two->path);
3220 else if (p->two->mode == 0)
3221 len1 = snprintf(buffer, sizeof(buffer),
3222 "diff--gita/%.*sb/%.*s"
3223 "deletedfilemode%06o"
3224 "---a/%.*s"
3225 "+++/dev/null",
3226 len1, p->one->path,
3227 len2, p->two->path,
3228 p->one->mode,
3229 len1, p->one->path);
3230 else
3231 len1 = snprintf(buffer, sizeof(buffer),
3232 "diff--gita/%.*sb/%.*s"
3233 "---a/%.*s"
3234 "+++b/%.*s",
3235 len1, p->one->path,
3236 len2, p->two->path,
3237 len1, p->one->path,
3238 len2, p->two->path);
3239 SHA1_Update(&ctx, buffer, len1);
3240
3241 xpp.flags = XDF_NEED_MINIMAL;
3242 xecfg.ctxlen = 3;
3243 xecfg.flags = XDL_EMIT_FUNCNAMES;
3244 ecb.outf = xdiff_outf;
3245 ecb.priv = &data;
3246 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
3247 }
3248
3249 SHA1_Final(sha1, &ctx);
3250 return 0;
3251 }
3252
3253 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3254 {
3255 struct diff_queue_struct *q = &diff_queued_diff;
3256 int i;
3257 int result = diff_get_patch_id(options, sha1);
3258
3259 for (i = 0; i < q->nr; i++)
3260 diff_free_filepair(q->queue[i]);
3261
3262 free(q->queue);
3263 q->queue = NULL;
3264 q->nr = q->alloc = 0;
3265
3266 return result;
3267 }
3268
3269 static int is_summary_empty(const struct diff_queue_struct *q)
3270 {
3271 int i;
3272
3273 for (i = 0; i < q->nr; i++) {
3274 const struct diff_filepair *p = q->queue[i];
3275
3276 switch (p->status) {
3277 case DIFF_STATUS_DELETED:
3278 case DIFF_STATUS_ADDED:
3279 case DIFF_STATUS_COPIED:
3280 case DIFF_STATUS_RENAMED:
3281 return 0;
3282 default:
3283 if (p->score)
3284 return 0;
3285 if (p->one->mode && p->two->mode &&
3286 p->one->mode != p->two->mode)
3287 return 0;
3288 break;
3289 }
3290 }
3291 return 1;
3292 }
3293
3294 void diff_flush(struct diff_options *options)
3295 {
3296 struct diff_queue_struct *q = &diff_queued_diff;
3297 int i, output_format = options->output_format;
3298 int separator = 0;
3299
3300 /*
3301 * Order: raw, stat, summary, patch
3302 * or: name/name-status/checkdiff (other bits clear)
3303 */
3304 if (!q->nr)
3305 goto free_queue;
3306
3307 if (output_format & (DIFF_FORMAT_RAW |
3308 DIFF_FORMAT_NAME |
3309 DIFF_FORMAT_NAME_STATUS |
3310 DIFF_FORMAT_CHECKDIFF)) {
3311 for (i = 0; i < q->nr; i++) {
3312 struct diff_filepair *p = q->queue[i];
3313 if (check_pair_status(p))
3314 flush_one_pair(p, options);
3315 }
3316 separator++;
3317 }
3318
3319 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3320 struct diffstat_t diffstat;
3321
3322 memset(&diffstat, 0, sizeof(struct diffstat_t));
3323 diffstat.xm.consume = diffstat_consume;
3324 for (i = 0; i < q->nr; i++) {
3325 struct diff_filepair *p = q->queue[i];
3326 if (check_pair_status(p))
3327 diff_flush_stat(p, options, &diffstat);
3328 }
3329 if (output_format & DIFF_FORMAT_NUMSTAT)
3330 show_numstat(&diffstat, options);
3331 if (output_format & DIFF_FORMAT_DIFFSTAT)
3332 show_stats(&diffstat, options);
3333 if (output_format & DIFF_FORMAT_SHORTSTAT)
3334 show_shortstats(&diffstat, options);
3335 free_diffstat_info(&diffstat);
3336 separator++;
3337 }
3338 if (output_format & DIFF_FORMAT_DIRSTAT)
3339 show_dirstat(options);
3340
3341 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3342 for (i = 0; i < q->nr; i++)
3343 diff_summary(options->file, q->queue[i]);
3344 separator++;
3345 }
3346
3347 if (output_format & DIFF_FORMAT_PATCH) {
3348 if (separator) {
3349 putc(options->line_termination, options->file);
3350 if (options->stat_sep) {
3351 /* attach patch instead of inline */
3352 fputs(options->stat_sep, options->file);
3353 }
3354 }
3355
3356 for (i = 0; i < q->nr; i++) {
3357 struct diff_filepair *p = q->queue[i];
3358 if (check_pair_status(p))
3359 diff_flush_patch(p, options);
3360 }
3361 }
3362
3363 if (output_format & DIFF_FORMAT_CALLBACK)
3364 options->format_callback(q, options, options->format_callback_data);
3365
3366 for (i = 0; i < q->nr; i++)
3367 diff_free_filepair(q->queue[i]);
3368 free_queue:
3369 free(q->queue);
3370 q->queue = NULL;
3371 q->nr = q->alloc = 0;
3372 if (options->close_file)
3373 fclose(options->file);
3374 }
3375
3376 static void diffcore_apply_filter(const char *filter)
3377 {
3378 int i;
3379 struct diff_queue_struct *q = &diff_queued_diff;
3380 struct diff_queue_struct outq;
3381 outq.queue = NULL;
3382 outq.nr = outq.alloc = 0;
3383
3384 if (!filter)
3385 return;
3386
3387 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3388 int found;
3389 for (i = found = 0; !found && i < q->nr; i++) {
3390 struct diff_filepair *p = q->queue[i];
3391 if (((p->status == DIFF_STATUS_MODIFIED) &&
3392 ((p->score &&
3393 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3394 (!p->score &&
3395 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3396 ((p->status != DIFF_STATUS_MODIFIED) &&
3397 strchr(filter, p->status)))
3398 found++;
3399 }
3400 if (found)
3401 return;
3402
3403 /* otherwise we will clear the whole queue
3404 * by copying the empty outq at the end of this
3405 * function, but first clear the current entries
3406 * in the queue.
3407 */
3408 for (i = 0; i < q->nr; i++)
3409 diff_free_filepair(q->queue[i]);
3410 }
3411 else {
3412 /* Only the matching ones */
3413 for (i = 0; i < q->nr; i++) {
3414 struct diff_filepair *p = q->queue[i];
3415
3416 if (((p->status == DIFF_STATUS_MODIFIED) &&
3417 ((p->score &&
3418 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3419 (!p->score &&
3420 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3421 ((p->status != DIFF_STATUS_MODIFIED) &&
3422 strchr(filter, p->status)))
3423 diff_q(&outq, p);
3424 else
3425 diff_free_filepair(p);
3426 }
3427 }
3428 free(q->queue);
3429 *q = outq;
3430 }
3431
3432 /* Check whether two filespecs with the same mode and size are identical */
3433 static int diff_filespec_is_identical(struct diff_filespec *one,
3434 struct diff_filespec *two)
3435 {
3436 if (S_ISGITLINK(one->mode))
3437 return 0;
3438 if (diff_populate_filespec(one, 0))
3439 return 0;
3440 if (diff_populate_filespec(two, 0))
3441 return 0;
3442 return !memcmp(one->data, two->data, one->size);
3443 }
3444
3445 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3446 {
3447 int i;
3448 struct diff_queue_struct *q = &diff_queued_diff;
3449 struct diff_queue_struct outq;
3450 outq.queue = NULL;
3451 outq.nr = outq.alloc = 0;
3452
3453 for (i = 0; i < q->nr; i++) {
3454 struct diff_filepair *p = q->queue[i];
3455
3456 /*
3457 * 1. Entries that come from stat info dirtyness
3458 * always have both sides (iow, not create/delete),
3459 * one side of the object name is unknown, with
3460 * the same mode and size. Keep the ones that
3461 * do not match these criteria. They have real
3462 * differences.
3463 *
3464 * 2. At this point, the file is known to be modified,
3465 * with the same mode and size, and the object
3466 * name of one side is unknown. Need to inspect
3467 * the identical contents.
3468 */
3469 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3470 !DIFF_FILE_VALID(p->two) ||
3471 (p->one->sha1_valid && p->two->sha1_valid) ||
3472 (p->one->mode != p->two->mode) ||
3473 diff_populate_filespec(p->one, 1) ||
3474 diff_populate_filespec(p->two, 1) ||
3475 (p->one->size != p->two->size) ||
3476 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3477 diff_q(&outq, p);
3478 else {
3479 /*
3480 * The caller can subtract 1 from skip_stat_unmatch
3481 * to determine how many paths were dirty only
3482 * due to stat info mismatch.
3483 */
3484 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3485 diffopt->skip_stat_unmatch++;
3486 diff_free_filepair(p);
3487 }
3488 }
3489 free(q->queue);
3490 *q = outq;
3491 }
3492
3493 void diffcore_std(struct diff_options *options)
3494 {
3495 if (options->skip_stat_unmatch)
3496 diffcore_skip_stat_unmatch(options);
3497 if (options->break_opt != -1)
3498 diffcore_break(options->break_opt);
3499 if (options->detect_rename)
3500 diffcore_rename(options);
3501 if (options->break_opt != -1)
3502 diffcore_merge_broken();
3503 if (options->pickaxe)
3504 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3505 if (options->orderfile)
3506 diffcore_order(options->orderfile);
3507 diff_resolve_rename_copy();
3508 diffcore_apply_filter(options->filter);
3509
3510 if (diff_queued_diff.nr)
3511 DIFF_OPT_SET(options, HAS_CHANGES);
3512 else
3513 DIFF_OPT_CLR(options, HAS_CHANGES);
3514 }
3515
3516 int diff_result_code(struct diff_options *opt, int status)
3517 {
3518 int result = 0;
3519 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3520 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3521 return status;
3522 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3523 DIFF_OPT_TST(opt, HAS_CHANGES))
3524 result |= 01;
3525 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3526 DIFF_OPT_TST(opt, CHECK_FAILED))
3527 result |= 02;
3528 return result;
3529 }
3530
3531 void diff_addremove(struct diff_options *options,
3532 int addremove, unsigned mode,
3533 const unsigned char *sha1,
3534 const char *concatpath)
3535 {
3536 struct diff_filespec *one, *two;
3537
3538 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3539 return;
3540
3541 /* This may look odd, but it is a preparation for
3542 * feeding "there are unchanged files which should
3543 * not produce diffs, but when you are doing copy
3544 * detection you would need them, so here they are"
3545 * entries to the diff-core. They will be prefixed
3546 * with something like '=' or '*' (I haven't decided
3547 * which but should not make any difference).
3548 * Feeding the same new and old to diff_change()
3549 * also has the same effect.
3550 * Before the final output happens, they are pruned after
3551 * merged into rename/copy pairs as appropriate.
3552 */
3553 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3554 addremove = (addremove == '+' ? '-' :
3555 addremove == '-' ? '+' : addremove);
3556
3557 if (options->prefix &&
3558 strncmp(concatpath, options->prefix, options->prefix_length))
3559 return;
3560
3561 one = alloc_filespec(concatpath);
3562 two = alloc_filespec(concatpath);
3563
3564 if (addremove != '+')
3565 fill_filespec(one, sha1, mode);
3566 if (addremove != '-')
3567 fill_filespec(two, sha1, mode);
3568
3569 diff_queue(&diff_queued_diff, one, two);
3570 DIFF_OPT_SET(options, HAS_CHANGES);
3571 }
3572
3573 void diff_change(struct diff_options *options,
3574 unsigned old_mode, unsigned new_mode,
3575 const unsigned char *old_sha1,
3576 const unsigned char *new_sha1,
3577 const char *concatpath)
3578 {
3579 struct diff_filespec *one, *two;
3580
3581 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3582 && S_ISGITLINK(new_mode))
3583 return;
3584
3585 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3586 unsigned tmp;
3587 const unsigned char *tmp_c;
3588 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3589 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3590 }
3591
3592 if (options->prefix &&
3593 strncmp(concatpath, options->prefix, options->prefix_length))
3594 return;
3595
3596 one = alloc_filespec(concatpath);
3597 two = alloc_filespec(concatpath);
3598 fill_filespec(one, old_sha1, old_mode);
3599 fill_filespec(two, new_sha1, new_mode);
3600
3601 diff_queue(&diff_queued_diff, one, two);
3602 DIFF_OPT_SET(options, HAS_CHANGES);
3603 }
3604
3605 void diff_unmerge(struct diff_options *options,
3606 const char *path,
3607 unsigned mode, const unsigned char *sha1)
3608 {
3609 struct diff_filespec *one, *two;
3610
3611 if (options->prefix &&
3612 strncmp(path, options->prefix, options->prefix_length))
3613 return;
3614
3615 one = alloc_filespec(path);
3616 two = alloc_filespec(path);
3617 fill_filespec(one, sha1, mode);
3618 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3619 }