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1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
16 #ifdef NO_FAST_WORKING_DIRECTORY
17 #define FAST_WORKING_DIRECTORY 0
18 #else
19 #define FAST_WORKING_DIRECTORY 1
20 #endif
22 static int diff_detect_rename_default;
23 static int diff_rename_limit_default = 200;
24 static int diff_suppress_blank_empty;
25 int diff_use_color_default = -1;
26 static const char *external_diff_cmd_cfg;
27 int diff_auto_refresh_index = 1;
28 static int diff_mnemonic_prefix;
30 static char diff_colors[][COLOR_MAXLEN] = {
31 "\033[m", /* reset */
32 "", /* PLAIN (normal) */
33 "\033[1m", /* METAINFO (bold) */
34 "\033[36m", /* FRAGINFO (cyan) */
35 "\033[31m", /* OLD (red) */
36 "\033[32m", /* NEW (green) */
37 "\033[33m", /* COMMIT (yellow) */
38 "\033[41m", /* WHITESPACE (red background) */
39 };
41 static void diff_filespec_load_driver(struct diff_filespec *one);
42 static char *run_textconv(const char *, struct diff_filespec *, size_t *);
44 static int parse_diff_color_slot(const char *var, int ofs)
45 {
46 if (!strcasecmp(var+ofs, "plain"))
47 return DIFF_PLAIN;
48 if (!strcasecmp(var+ofs, "meta"))
49 return DIFF_METAINFO;
50 if (!strcasecmp(var+ofs, "frag"))
51 return DIFF_FRAGINFO;
52 if (!strcasecmp(var+ofs, "old"))
53 return DIFF_FILE_OLD;
54 if (!strcasecmp(var+ofs, "new"))
55 return DIFF_FILE_NEW;
56 if (!strcasecmp(var+ofs, "commit"))
57 return DIFF_COMMIT;
58 if (!strcasecmp(var+ofs, "whitespace"))
59 return DIFF_WHITESPACE;
60 die("bad config variable '%s'", var);
61 }
63 /*
64 * These are to give UI layer defaults.
65 * The core-level commands such as git-diff-files should
66 * never be affected by the setting of diff.renames
67 * the user happens to have in the configuration file.
68 */
69 int git_diff_ui_config(const char *var, const char *value, void *cb)
70 {
71 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
72 diff_use_color_default = git_config_colorbool(var, value, -1);
73 return 0;
74 }
75 if (!strcmp(var, "diff.renames")) {
76 if (!value)
77 diff_detect_rename_default = DIFF_DETECT_RENAME;
78 else if (!strcasecmp(value, "copies") ||
79 !strcasecmp(value, "copy"))
80 diff_detect_rename_default = DIFF_DETECT_COPY;
81 else if (git_config_bool(var,value))
82 diff_detect_rename_default = DIFF_DETECT_RENAME;
83 return 0;
84 }
85 if (!strcmp(var, "diff.autorefreshindex")) {
86 diff_auto_refresh_index = git_config_bool(var, value);
87 return 0;
88 }
89 if (!strcmp(var, "diff.mnemonicprefix")) {
90 diff_mnemonic_prefix = git_config_bool(var, value);
91 return 0;
92 }
93 if (!strcmp(var, "diff.external"))
94 return git_config_string(&external_diff_cmd_cfg, var, value);
96 return git_diff_basic_config(var, value, cb);
97 }
99 int git_diff_basic_config(const char *var, const char *value, void *cb)
100 {
101 if (!strcmp(var, "diff.renamelimit")) {
102 diff_rename_limit_default = git_config_int(var, value);
103 return 0;
104 }
106 switch (userdiff_config(var, value)) {
107 case 0: break;
108 case -1: return -1;
109 default: return 0;
110 }
112 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
113 int slot = parse_diff_color_slot(var, 11);
114 if (!value)
115 return config_error_nonbool(var);
116 color_parse(value, var, diff_colors[slot]);
117 return 0;
118 }
120 /* like GNU diff's --suppress-blank-empty option */
121 if (!strcmp(var, "diff.suppressblankempty") ||
122 /* for backwards compatibility */
123 !strcmp(var, "diff.suppress-blank-empty")) {
124 diff_suppress_blank_empty = git_config_bool(var, value);
125 return 0;
126 }
128 return git_color_default_config(var, value, cb);
129 }
131 static char *quote_two(const char *one, const char *two)
132 {
133 int need_one = quote_c_style(one, NULL, NULL, 1);
134 int need_two = quote_c_style(two, NULL, NULL, 1);
135 struct strbuf res = STRBUF_INIT;
137 if (need_one + need_two) {
138 strbuf_addch(&res, '"');
139 quote_c_style(one, &res, NULL, 1);
140 quote_c_style(two, &res, NULL, 1);
141 strbuf_addch(&res, '"');
142 } else {
143 strbuf_addstr(&res, one);
144 strbuf_addstr(&res, two);
145 }
146 return strbuf_detach(&res, NULL);
147 }
149 static const char *external_diff(void)
150 {
151 static const char *external_diff_cmd = NULL;
152 static int done_preparing = 0;
154 if (done_preparing)
155 return external_diff_cmd;
156 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
157 if (!external_diff_cmd)
158 external_diff_cmd = external_diff_cmd_cfg;
159 done_preparing = 1;
160 return external_diff_cmd;
161 }
163 static struct diff_tempfile {
164 const char *name; /* filename external diff should read from */
165 char hex[41];
166 char mode[10];
167 char tmp_path[PATH_MAX];
168 } diff_temp[2];
170 static int count_lines(const char *data, int size)
171 {
172 int count, ch, completely_empty = 1, nl_just_seen = 0;
173 count = 0;
174 while (0 < size--) {
175 ch = *data++;
176 if (ch == '\n') {
177 count++;
178 nl_just_seen = 1;
179 completely_empty = 0;
180 }
181 else {
182 nl_just_seen = 0;
183 completely_empty = 0;
184 }
185 }
186 if (completely_empty)
187 return 0;
188 if (!nl_just_seen)
189 count++; /* no trailing newline */
190 return count;
191 }
193 static void print_line_count(FILE *file, int count)
194 {
195 switch (count) {
196 case 0:
197 fprintf(file, "0,0");
198 break;
199 case 1:
200 fprintf(file, "1");
201 break;
202 default:
203 fprintf(file, "1,%d", count);
204 break;
205 }
206 }
208 static void copy_file_with_prefix(FILE *file,
209 int prefix, const char *data, int size,
210 const char *set, const char *reset)
211 {
212 int ch, nl_just_seen = 1;
213 while (0 < size--) {
214 ch = *data++;
215 if (nl_just_seen) {
216 fputs(set, file);
217 putc(prefix, file);
218 }
219 if (ch == '\n') {
220 nl_just_seen = 1;
221 fputs(reset, file);
222 } else
223 nl_just_seen = 0;
224 putc(ch, file);
225 }
226 if (!nl_just_seen)
227 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
228 }
230 static void emit_rewrite_diff(const char *name_a,
231 const char *name_b,
232 struct diff_filespec *one,
233 struct diff_filespec *two,
234 const char *textconv_one,
235 const char *textconv_two,
236 struct diff_options *o)
237 {
238 int lc_a, lc_b;
239 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
240 const char *name_a_tab, *name_b_tab;
241 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
242 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
243 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
244 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
245 const char *reset = diff_get_color(color_diff, DIFF_RESET);
246 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
247 const char *a_prefix, *b_prefix;
248 const char *data_one, *data_two;
249 size_t size_one, size_two;
251 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
252 a_prefix = o->b_prefix;
253 b_prefix = o->a_prefix;
254 } else {
255 a_prefix = o->a_prefix;
256 b_prefix = o->b_prefix;
257 }
259 name_a += (*name_a == '/');
260 name_b += (*name_b == '/');
261 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
262 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
264 strbuf_reset(&a_name);
265 strbuf_reset(&b_name);
266 quote_two_c_style(&a_name, a_prefix, name_a, 0);
267 quote_two_c_style(&b_name, b_prefix, name_b, 0);
269 diff_populate_filespec(one, 0);
270 diff_populate_filespec(two, 0);
271 if (textconv_one) {
272 data_one = run_textconv(textconv_one, one, &size_one);
273 if (!data_one)
274 die("unable to read files to diff");
275 }
276 else {
277 data_one = one->data;
278 size_one = one->size;
279 }
280 if (textconv_two) {
281 data_two = run_textconv(textconv_two, two, &size_two);
282 if (!data_two)
283 die("unable to read files to diff");
284 }
285 else {
286 data_two = two->data;
287 size_two = two->size;
288 }
290 lc_a = count_lines(data_one, size_one);
291 lc_b = count_lines(data_two, size_two);
292 fprintf(o->file,
293 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
294 metainfo, a_name.buf, name_a_tab, reset,
295 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
296 print_line_count(o->file, lc_a);
297 fprintf(o->file, " +");
298 print_line_count(o->file, lc_b);
299 fprintf(o->file, " @@%s\n", reset);
300 if (lc_a)
301 copy_file_with_prefix(o->file, '-', data_one, size_one, old, reset);
302 if (lc_b)
303 copy_file_with_prefix(o->file, '+', data_two, size_two, new, reset);
304 }
306 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
307 {
308 if (!DIFF_FILE_VALID(one)) {
309 mf->ptr = (char *)""; /* does not matter */
310 mf->size = 0;
311 return 0;
312 }
313 else if (diff_populate_filespec(one, 0))
314 return -1;
316 mf->ptr = one->data;
317 mf->size = one->size;
318 return 0;
319 }
321 struct diff_words_buffer {
322 mmfile_t text;
323 long alloc;
324 long current; /* output pointer */
325 int suppressed_newline;
326 };
328 static void diff_words_append(char *line, unsigned long len,
329 struct diff_words_buffer *buffer)
330 {
331 if (buffer->text.size + len > buffer->alloc) {
332 buffer->alloc = (buffer->text.size + len) * 3 / 2;
333 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
334 }
335 line++;
336 len--;
337 memcpy(buffer->text.ptr + buffer->text.size, line, len);
338 buffer->text.size += len;
339 }
341 struct diff_words_data {
342 struct diff_words_buffer minus, plus;
343 FILE *file;
344 };
346 static void print_word(FILE *file, struct diff_words_buffer *buffer, int len, int color,
347 int suppress_newline)
348 {
349 const char *ptr;
350 int eol = 0;
352 if (len == 0)
353 return;
355 ptr = buffer->text.ptr + buffer->current;
356 buffer->current += len;
358 if (ptr[len - 1] == '\n') {
359 eol = 1;
360 len--;
361 }
363 fputs(diff_get_color(1, color), file);
364 fwrite(ptr, len, 1, file);
365 fputs(diff_get_color(1, DIFF_RESET), file);
367 if (eol) {
368 if (suppress_newline)
369 buffer->suppressed_newline = 1;
370 else
371 putc('\n', file);
372 }
373 }
375 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
376 {
377 struct diff_words_data *diff_words = priv;
379 if (diff_words->minus.suppressed_newline) {
380 if (line[0] != '+')
381 putc('\n', diff_words->file);
382 diff_words->minus.suppressed_newline = 0;
383 }
385 len--;
386 switch (line[0]) {
387 case '-':
388 print_word(diff_words->file,
389 &diff_words->minus, len, DIFF_FILE_OLD, 1);
390 break;
391 case '+':
392 print_word(diff_words->file,
393 &diff_words->plus, len, DIFF_FILE_NEW, 0);
394 break;
395 case ' ':
396 print_word(diff_words->file,
397 &diff_words->plus, len, DIFF_PLAIN, 0);
398 diff_words->minus.current += len;
399 break;
400 }
401 }
403 /* this executes the word diff on the accumulated buffers */
404 static void diff_words_show(struct diff_words_data *diff_words)
405 {
406 xpparam_t xpp;
407 xdemitconf_t xecfg;
408 xdemitcb_t ecb;
409 mmfile_t minus, plus;
410 int i;
412 memset(&xpp, 0, sizeof(xpp));
413 memset(&xecfg, 0, sizeof(xecfg));
414 minus.size = diff_words->minus.text.size;
415 minus.ptr = xmalloc(minus.size);
416 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
417 for (i = 0; i < minus.size; i++)
418 if (isspace(minus.ptr[i]))
419 minus.ptr[i] = '\n';
420 diff_words->minus.current = 0;
422 plus.size = diff_words->plus.text.size;
423 plus.ptr = xmalloc(plus.size);
424 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
425 for (i = 0; i < plus.size; i++)
426 if (isspace(plus.ptr[i]))
427 plus.ptr[i] = '\n';
428 diff_words->plus.current = 0;
430 xpp.flags = XDF_NEED_MINIMAL;
431 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
432 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
433 &xpp, &xecfg, &ecb);
434 free(minus.ptr);
435 free(plus.ptr);
436 diff_words->minus.text.size = diff_words->plus.text.size = 0;
438 if (diff_words->minus.suppressed_newline) {
439 putc('\n', diff_words->file);
440 diff_words->minus.suppressed_newline = 0;
441 }
442 }
444 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
446 struct emit_callback {
447 int nparents, color_diff;
448 unsigned ws_rule;
449 sane_truncate_fn truncate;
450 const char **label_path;
451 struct diff_words_data *diff_words;
452 int *found_changesp;
453 FILE *file;
454 };
456 static void free_diff_words_data(struct emit_callback *ecbdata)
457 {
458 if (ecbdata->diff_words) {
459 /* flush buffers */
460 if (ecbdata->diff_words->minus.text.size ||
461 ecbdata->diff_words->plus.text.size)
462 diff_words_show(ecbdata->diff_words);
464 free (ecbdata->diff_words->minus.text.ptr);
465 free (ecbdata->diff_words->plus.text.ptr);
466 free(ecbdata->diff_words);
467 ecbdata->diff_words = NULL;
468 }
469 }
471 const char *diff_get_color(int diff_use_color, enum color_diff ix)
472 {
473 if (diff_use_color)
474 return diff_colors[ix];
475 return "";
476 }
478 static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
479 {
480 int has_trailing_newline, has_trailing_carriage_return;
482 has_trailing_newline = (len > 0 && line[len-1] == '\n');
483 if (has_trailing_newline)
484 len--;
485 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
486 if (has_trailing_carriage_return)
487 len--;
489 fputs(set, file);
490 fwrite(line, len, 1, file);
491 fputs(reset, file);
492 if (has_trailing_carriage_return)
493 fputc('\r', file);
494 if (has_trailing_newline)
495 fputc('\n', file);
496 }
498 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
499 {
500 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
501 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
503 if (!*ws)
504 emit_line(ecbdata->file, set, reset, line, len);
505 else {
506 /* Emit just the prefix, then the rest. */
507 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
508 ws_check_emit(line + ecbdata->nparents,
509 len - ecbdata->nparents, ecbdata->ws_rule,
510 ecbdata->file, set, reset, ws);
511 }
512 }
514 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
515 {
516 const char *cp;
517 unsigned long allot;
518 size_t l = len;
520 if (ecb->truncate)
521 return ecb->truncate(line, len);
522 cp = line;
523 allot = l;
524 while (0 < l) {
525 (void) utf8_width(&cp, &l);
526 if (!cp)
527 break; /* truncated in the middle? */
528 }
529 return allot - l;
530 }
532 static void fn_out_consume(void *priv, char *line, unsigned long len)
533 {
534 int i;
535 int color;
536 struct emit_callback *ecbdata = priv;
537 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
538 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
539 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
541 *(ecbdata->found_changesp) = 1;
543 if (ecbdata->label_path[0]) {
544 const char *name_a_tab, *name_b_tab;
546 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
547 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
549 fprintf(ecbdata->file, "%s--- %s%s%s\n",
550 meta, ecbdata->label_path[0], reset, name_a_tab);
551 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
552 meta, ecbdata->label_path[1], reset, name_b_tab);
553 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
554 }
556 if (diff_suppress_blank_empty
557 && len == 2 && line[0] == ' ' && line[1] == '\n') {
558 line[0] = '\n';
559 len = 1;
560 }
562 /* This is not really necessary for now because
563 * this codepath only deals with two-way diffs.
564 */
565 for (i = 0; i < len && line[i] == '@'; i++)
566 ;
567 if (2 <= i && i < len && line[i] == ' ') {
568 ecbdata->nparents = i - 1;
569 len = sane_truncate_line(ecbdata, line, len);
570 emit_line(ecbdata->file,
571 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
572 reset, line, len);
573 if (line[len-1] != '\n')
574 putc('\n', ecbdata->file);
575 return;
576 }
578 if (len < ecbdata->nparents) {
579 emit_line(ecbdata->file, reset, reset, line, len);
580 return;
581 }
583 color = DIFF_PLAIN;
584 if (ecbdata->diff_words && ecbdata->nparents != 1)
585 /* fall back to normal diff */
586 free_diff_words_data(ecbdata);
587 if (ecbdata->diff_words) {
588 if (line[0] == '-') {
589 diff_words_append(line, len,
590 &ecbdata->diff_words->minus);
591 return;
592 } else if (line[0] == '+') {
593 diff_words_append(line, len,
594 &ecbdata->diff_words->plus);
595 return;
596 }
597 if (ecbdata->diff_words->minus.text.size ||
598 ecbdata->diff_words->plus.text.size)
599 diff_words_show(ecbdata->diff_words);
600 line++;
601 len--;
602 emit_line(ecbdata->file, plain, reset, line, len);
603 return;
604 }
605 for (i = 0; i < ecbdata->nparents && len; i++) {
606 if (line[i] == '-')
607 color = DIFF_FILE_OLD;
608 else if (line[i] == '+')
609 color = DIFF_FILE_NEW;
610 }
612 if (color != DIFF_FILE_NEW) {
613 emit_line(ecbdata->file,
614 diff_get_color(ecbdata->color_diff, color),
615 reset, line, len);
616 return;
617 }
618 emit_add_line(reset, ecbdata, line, len);
619 }
621 static char *pprint_rename(const char *a, const char *b)
622 {
623 const char *old = a;
624 const char *new = b;
625 struct strbuf name = STRBUF_INIT;
626 int pfx_length, sfx_length;
627 int len_a = strlen(a);
628 int len_b = strlen(b);
629 int a_midlen, b_midlen;
630 int qlen_a = quote_c_style(a, NULL, NULL, 0);
631 int qlen_b = quote_c_style(b, NULL, NULL, 0);
633 if (qlen_a || qlen_b) {
634 quote_c_style(a, &name, NULL, 0);
635 strbuf_addstr(&name, " => ");
636 quote_c_style(b, &name, NULL, 0);
637 return strbuf_detach(&name, NULL);
638 }
640 /* Find common prefix */
641 pfx_length = 0;
642 while (*old && *new && *old == *new) {
643 if (*old == '/')
644 pfx_length = old - a + 1;
645 old++;
646 new++;
647 }
649 /* Find common suffix */
650 old = a + len_a;
651 new = b + len_b;
652 sfx_length = 0;
653 while (a <= old && b <= new && *old == *new) {
654 if (*old == '/')
655 sfx_length = len_a - (old - a);
656 old--;
657 new--;
658 }
660 /*
661 * pfx{mid-a => mid-b}sfx
662 * {pfx-a => pfx-b}sfx
663 * pfx{sfx-a => sfx-b}
664 * name-a => name-b
665 */
666 a_midlen = len_a - pfx_length - sfx_length;
667 b_midlen = len_b - pfx_length - sfx_length;
668 if (a_midlen < 0)
669 a_midlen = 0;
670 if (b_midlen < 0)
671 b_midlen = 0;
673 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
674 if (pfx_length + sfx_length) {
675 strbuf_add(&name, a, pfx_length);
676 strbuf_addch(&name, '{');
677 }
678 strbuf_add(&name, a + pfx_length, a_midlen);
679 strbuf_addstr(&name, " => ");
680 strbuf_add(&name, b + pfx_length, b_midlen);
681 if (pfx_length + sfx_length) {
682 strbuf_addch(&name, '}');
683 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
684 }
685 return strbuf_detach(&name, NULL);
686 }
688 struct diffstat_t {
689 int nr;
690 int alloc;
691 struct diffstat_file {
692 char *from_name;
693 char *name;
694 char *print_name;
695 unsigned is_unmerged:1;
696 unsigned is_binary:1;
697 unsigned is_renamed:1;
698 unsigned int added, deleted;
699 } **files;
700 };
702 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
703 const char *name_a,
704 const char *name_b)
705 {
706 struct diffstat_file *x;
707 x = xcalloc(sizeof (*x), 1);
708 if (diffstat->nr == diffstat->alloc) {
709 diffstat->alloc = alloc_nr(diffstat->alloc);
710 diffstat->files = xrealloc(diffstat->files,
711 diffstat->alloc * sizeof(x));
712 }
713 diffstat->files[diffstat->nr++] = x;
714 if (name_b) {
715 x->from_name = xstrdup(name_a);
716 x->name = xstrdup(name_b);
717 x->is_renamed = 1;
718 }
719 else {
720 x->from_name = NULL;
721 x->name = xstrdup(name_a);
722 }
723 return x;
724 }
726 static void diffstat_consume(void *priv, char *line, unsigned long len)
727 {
728 struct diffstat_t *diffstat = priv;
729 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
731 if (line[0] == '+')
732 x->added++;
733 else if (line[0] == '-')
734 x->deleted++;
735 }
737 const char mime_boundary_leader[] = "------------";
739 static int scale_linear(int it, int width, int max_change)
740 {
741 /*
742 * make sure that at least one '-' is printed if there were deletions,
743 * and likewise for '+'.
744 */
745 if (max_change < 2)
746 return it;
747 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
748 }
750 static void show_name(FILE *file,
751 const char *prefix, const char *name, int len,
752 const char *reset, const char *set)
753 {
754 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
755 }
757 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
758 {
759 if (cnt <= 0)
760 return;
761 fprintf(file, "%s", set);
762 while (cnt--)
763 putc(ch, file);
764 fprintf(file, "%s", reset);
765 }
767 static void fill_print_name(struct diffstat_file *file)
768 {
769 char *pname;
771 if (file->print_name)
772 return;
774 if (!file->is_renamed) {
775 struct strbuf buf = STRBUF_INIT;
776 if (quote_c_style(file->name, &buf, NULL, 0)) {
777 pname = strbuf_detach(&buf, NULL);
778 } else {
779 pname = file->name;
780 strbuf_release(&buf);
781 }
782 } else {
783 pname = pprint_rename(file->from_name, file->name);
784 }
785 file->print_name = pname;
786 }
788 static void show_stats(struct diffstat_t* data, struct diff_options *options)
789 {
790 int i, len, add, del, total, adds = 0, dels = 0;
791 int max_change = 0, max_len = 0;
792 int total_files = data->nr;
793 int width, name_width;
794 const char *reset, *set, *add_c, *del_c;
796 if (data->nr == 0)
797 return;
799 width = options->stat_width ? options->stat_width : 80;
800 name_width = options->stat_name_width ? options->stat_name_width : 50;
802 /* Sanity: give at least 5 columns to the graph,
803 * but leave at least 10 columns for the name.
804 */
805 if (width < 25)
806 width = 25;
807 if (name_width < 10)
808 name_width = 10;
809 else if (width < name_width + 15)
810 name_width = width - 15;
812 /* Find the longest filename and max number of changes */
813 reset = diff_get_color_opt(options, DIFF_RESET);
814 set = diff_get_color_opt(options, DIFF_PLAIN);
815 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
816 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
818 for (i = 0; i < data->nr; i++) {
819 struct diffstat_file *file = data->files[i];
820 int change = file->added + file->deleted;
821 fill_print_name(file);
822 len = strlen(file->print_name);
823 if (max_len < len)
824 max_len = len;
826 if (file->is_binary || file->is_unmerged)
827 continue;
828 if (max_change < change)
829 max_change = change;
830 }
832 /* Compute the width of the graph part;
833 * 10 is for one blank at the beginning of the line plus
834 * " | count " between the name and the graph.
835 *
836 * From here on, name_width is the width of the name area,
837 * and width is the width of the graph area.
838 */
839 name_width = (name_width < max_len) ? name_width : max_len;
840 if (width < (name_width + 10) + max_change)
841 width = width - (name_width + 10);
842 else
843 width = max_change;
845 for (i = 0; i < data->nr; i++) {
846 const char *prefix = "";
847 char *name = data->files[i]->print_name;
848 int added = data->files[i]->added;
849 int deleted = data->files[i]->deleted;
850 int name_len;
852 /*
853 * "scale" the filename
854 */
855 len = name_width;
856 name_len = strlen(name);
857 if (name_width < name_len) {
858 char *slash;
859 prefix = "...";
860 len -= 3;
861 name += name_len - len;
862 slash = strchr(name, '/');
863 if (slash)
864 name = slash;
865 }
867 if (data->files[i]->is_binary) {
868 show_name(options->file, prefix, name, len, reset, set);
869 fprintf(options->file, " Bin ");
870 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
871 fprintf(options->file, " -> ");
872 fprintf(options->file, "%s%d%s", add_c, added, reset);
873 fprintf(options->file, " bytes");
874 fprintf(options->file, "\n");
875 continue;
876 }
877 else if (data->files[i]->is_unmerged) {
878 show_name(options->file, prefix, name, len, reset, set);
879 fprintf(options->file, " Unmerged\n");
880 continue;
881 }
882 else if (!data->files[i]->is_renamed &&
883 (added + deleted == 0)) {
884 total_files--;
885 continue;
886 }
888 /*
889 * scale the add/delete
890 */
891 add = added;
892 del = deleted;
893 total = add + del;
894 adds += add;
895 dels += del;
897 if (width <= max_change) {
898 add = scale_linear(add, width, max_change);
899 del = scale_linear(del, width, max_change);
900 total = add + del;
901 }
902 show_name(options->file, prefix, name, len, reset, set);
903 fprintf(options->file, "%5d%s", added + deleted,
904 added + deleted ? " " : "");
905 show_graph(options->file, '+', add, add_c, reset);
906 show_graph(options->file, '-', del, del_c, reset);
907 fprintf(options->file, "\n");
908 }
909 fprintf(options->file,
910 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
911 set, total_files, adds, dels, reset);
912 }
914 static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
915 {
916 int i, adds = 0, dels = 0, total_files = data->nr;
918 if (data->nr == 0)
919 return;
921 for (i = 0; i < data->nr; i++) {
922 if (!data->files[i]->is_binary &&
923 !data->files[i]->is_unmerged) {
924 int added = data->files[i]->added;
925 int deleted= data->files[i]->deleted;
926 if (!data->files[i]->is_renamed &&
927 (added + deleted == 0)) {
928 total_files--;
929 } else {
930 adds += added;
931 dels += deleted;
932 }
933 }
934 }
935 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
936 total_files, adds, dels);
937 }
939 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
940 {
941 int i;
943 if (data->nr == 0)
944 return;
946 for (i = 0; i < data->nr; i++) {
947 struct diffstat_file *file = data->files[i];
949 if (file->is_binary)
950 fprintf(options->file, "-\t-\t");
951 else
952 fprintf(options->file,
953 "%d\t%d\t", file->added, file->deleted);
954 if (options->line_termination) {
955 fill_print_name(file);
956 if (!file->is_renamed)
957 write_name_quoted(file->name, options->file,
958 options->line_termination);
959 else {
960 fputs(file->print_name, options->file);
961 putc(options->line_termination, options->file);
962 }
963 } else {
964 if (file->is_renamed) {
965 putc('\0', options->file);
966 write_name_quoted(file->from_name, options->file, '\0');
967 }
968 write_name_quoted(file->name, options->file, '\0');
969 }
970 }
971 }
973 struct dirstat_file {
974 const char *name;
975 unsigned long changed;
976 };
978 struct dirstat_dir {
979 struct dirstat_file *files;
980 int alloc, nr, percent, cumulative;
981 };
983 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
984 {
985 unsigned long this_dir = 0;
986 unsigned int sources = 0;
988 while (dir->nr) {
989 struct dirstat_file *f = dir->files;
990 int namelen = strlen(f->name);
991 unsigned long this;
992 char *slash;
994 if (namelen < baselen)
995 break;
996 if (memcmp(f->name, base, baselen))
997 break;
998 slash = strchr(f->name + baselen, '/');
999 if (slash) {
1000 int newbaselen = slash + 1 - f->name;
1001 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1002 sources++;
1003 } else {
1004 this = f->changed;
1005 dir->files++;
1006 dir->nr--;
1007 sources += 2;
1008 }
1009 this_dir += this;
1010 }
1012 /*
1013 * We don't report dirstat's for
1014 * - the top level
1015 * - or cases where everything came from a single directory
1016 * under this directory (sources == 1).
1017 */
1018 if (baselen && sources != 1) {
1019 int permille = this_dir * 1000 / changed;
1020 if (permille) {
1021 int percent = permille / 10;
1022 if (percent >= dir->percent) {
1023 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1024 if (!dir->cumulative)
1025 return 0;
1026 }
1027 }
1028 }
1029 return this_dir;
1030 }
1032 static int dirstat_compare(const void *_a, const void *_b)
1033 {
1034 const struct dirstat_file *a = _a;
1035 const struct dirstat_file *b = _b;
1036 return strcmp(a->name, b->name);
1037 }
1039 static void show_dirstat(struct diff_options *options)
1040 {
1041 int i;
1042 unsigned long changed;
1043 struct dirstat_dir dir;
1044 struct diff_queue_struct *q = &diff_queued_diff;
1046 dir.files = NULL;
1047 dir.alloc = 0;
1048 dir.nr = 0;
1049 dir.percent = options->dirstat_percent;
1050 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1052 changed = 0;
1053 for (i = 0; i < q->nr; i++) {
1054 struct diff_filepair *p = q->queue[i];
1055 const char *name;
1056 unsigned long copied, added, damage;
1058 name = p->one->path ? p->one->path : p->two->path;
1060 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1061 diff_populate_filespec(p->one, 0);
1062 diff_populate_filespec(p->two, 0);
1063 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1064 &copied, &added);
1065 diff_free_filespec_data(p->one);
1066 diff_free_filespec_data(p->two);
1067 } else if (DIFF_FILE_VALID(p->one)) {
1068 diff_populate_filespec(p->one, 1);
1069 copied = added = 0;
1070 diff_free_filespec_data(p->one);
1071 } else if (DIFF_FILE_VALID(p->two)) {
1072 diff_populate_filespec(p->two, 1);
1073 copied = 0;
1074 added = p->two->size;
1075 diff_free_filespec_data(p->two);
1076 } else
1077 continue;
1079 /*
1080 * Original minus copied is the removed material,
1081 * added is the new material. They are both damages
1082 * made to the preimage. In --dirstat-by-file mode, count
1083 * damaged files, not damaged lines. This is done by
1084 * counting only a single damaged line per file.
1085 */
1086 damage = (p->one->size - copied) + added;
1087 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1088 damage = 1;
1090 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1091 dir.files[dir.nr].name = name;
1092 dir.files[dir.nr].changed = damage;
1093 changed += damage;
1094 dir.nr++;
1095 }
1097 /* This can happen even with many files, if everything was renames */
1098 if (!changed)
1099 return;
1101 /* Show all directories with more than x% of the changes */
1102 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1103 gather_dirstat(options->file, &dir, changed, "", 0);
1104 }
1106 static void free_diffstat_info(struct diffstat_t *diffstat)
1107 {
1108 int i;
1109 for (i = 0; i < diffstat->nr; i++) {
1110 struct diffstat_file *f = diffstat->files[i];
1111 if (f->name != f->print_name)
1112 free(f->print_name);
1113 free(f->name);
1114 free(f->from_name);
1115 free(f);
1116 }
1117 free(diffstat->files);
1118 }
1120 struct checkdiff_t {
1121 const char *filename;
1122 int lineno;
1123 struct diff_options *o;
1124 unsigned ws_rule;
1125 unsigned status;
1126 int trailing_blanks_start;
1127 };
1129 static int is_conflict_marker(const char *line, unsigned long len)
1130 {
1131 char firstchar;
1132 int cnt;
1134 if (len < 8)
1135 return 0;
1136 firstchar = line[0];
1137 switch (firstchar) {
1138 case '=': case '>': case '<':
1139 break;
1140 default:
1141 return 0;
1142 }
1143 for (cnt = 1; cnt < 7; cnt++)
1144 if (line[cnt] != firstchar)
1145 return 0;
1146 /* line[0] thru line[6] are same as firstchar */
1147 if (firstchar == '=') {
1148 /* divider between ours and theirs? */
1149 if (len != 8 || line[7] != '\n')
1150 return 0;
1151 } else if (len < 8 || !isspace(line[7])) {
1152 /* not divider before ours nor after theirs */
1153 return 0;
1154 }
1155 return 1;
1156 }
1158 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1159 {
1160 struct checkdiff_t *data = priv;
1161 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1162 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1163 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1164 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1165 char *err;
1167 if (line[0] == '+') {
1168 unsigned bad;
1169 data->lineno++;
1170 if (!ws_blank_line(line + 1, len - 1, data->ws_rule))
1171 data->trailing_blanks_start = 0;
1172 else if (!data->trailing_blanks_start)
1173 data->trailing_blanks_start = data->lineno;
1174 if (is_conflict_marker(line + 1, len - 1)) {
1175 data->status |= 1;
1176 fprintf(data->o->file,
1177 "%s:%d: leftover conflict marker\n",
1178 data->filename, data->lineno);
1179 }
1180 bad = ws_check(line + 1, len - 1, data->ws_rule);
1181 if (!bad)
1182 return;
1183 data->status |= bad;
1184 err = whitespace_error_string(bad);
1185 fprintf(data->o->file, "%s:%d: %s.\n",
1186 data->filename, data->lineno, err);
1187 free(err);
1188 emit_line(data->o->file, set, reset, line, 1);
1189 ws_check_emit(line + 1, len - 1, data->ws_rule,
1190 data->o->file, set, reset, ws);
1191 } else if (line[0] == ' ') {
1192 data->lineno++;
1193 data->trailing_blanks_start = 0;
1194 } else if (line[0] == '@') {
1195 char *plus = strchr(line, '+');
1196 if (plus)
1197 data->lineno = strtol(plus, NULL, 10) - 1;
1198 else
1199 die("invalid diff");
1200 data->trailing_blanks_start = 0;
1201 }
1202 }
1204 static unsigned char *deflate_it(char *data,
1205 unsigned long size,
1206 unsigned long *result_size)
1207 {
1208 int bound;
1209 unsigned char *deflated;
1210 z_stream stream;
1212 memset(&stream, 0, sizeof(stream));
1213 deflateInit(&stream, zlib_compression_level);
1214 bound = deflateBound(&stream, size);
1215 deflated = xmalloc(bound);
1216 stream.next_out = deflated;
1217 stream.avail_out = bound;
1219 stream.next_in = (unsigned char *)data;
1220 stream.avail_in = size;
1221 while (deflate(&stream, Z_FINISH) == Z_OK)
1222 ; /* nothing */
1223 deflateEnd(&stream);
1224 *result_size = stream.total_out;
1225 return deflated;
1226 }
1228 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1229 {
1230 void *cp;
1231 void *delta;
1232 void *deflated;
1233 void *data;
1234 unsigned long orig_size;
1235 unsigned long delta_size;
1236 unsigned long deflate_size;
1237 unsigned long data_size;
1239 /* We could do deflated delta, or we could do just deflated two,
1240 * whichever is smaller.
1241 */
1242 delta = NULL;
1243 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1244 if (one->size && two->size) {
1245 delta = diff_delta(one->ptr, one->size,
1246 two->ptr, two->size,
1247 &delta_size, deflate_size);
1248 if (delta) {
1249 void *to_free = delta;
1250 orig_size = delta_size;
1251 delta = deflate_it(delta, delta_size, &delta_size);
1252 free(to_free);
1253 }
1254 }
1256 if (delta && delta_size < deflate_size) {
1257 fprintf(file, "delta %lu\n", orig_size);
1258 free(deflated);
1259 data = delta;
1260 data_size = delta_size;
1261 }
1262 else {
1263 fprintf(file, "literal %lu\n", two->size);
1264 free(delta);
1265 data = deflated;
1266 data_size = deflate_size;
1267 }
1269 /* emit data encoded in base85 */
1270 cp = data;
1271 while (data_size) {
1272 int bytes = (52 < data_size) ? 52 : data_size;
1273 char line[70];
1274 data_size -= bytes;
1275 if (bytes <= 26)
1276 line[0] = bytes + 'A' - 1;
1277 else
1278 line[0] = bytes - 26 + 'a' - 1;
1279 encode_85(line + 1, cp, bytes);
1280 cp = (char *) cp + bytes;
1281 fputs(line, file);
1282 fputc('\n', file);
1283 }
1284 fprintf(file, "\n");
1285 free(data);
1286 }
1288 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1289 {
1290 fprintf(file, "GIT binary patch\n");
1291 emit_binary_diff_body(file, one, two);
1292 emit_binary_diff_body(file, two, one);
1293 }
1295 static void diff_filespec_load_driver(struct diff_filespec *one)
1296 {
1297 if (!one->driver)
1298 one->driver = userdiff_find_by_path(one->path);
1299 if (!one->driver)
1300 one->driver = userdiff_find_by_name("default");
1301 }
1303 int diff_filespec_is_binary(struct diff_filespec *one)
1304 {
1305 if (one->is_binary == -1) {
1306 diff_filespec_load_driver(one);
1307 if (one->driver->binary != -1)
1308 one->is_binary = one->driver->binary;
1309 else {
1310 if (!one->data && DIFF_FILE_VALID(one))
1311 diff_populate_filespec(one, 0);
1312 if (one->data)
1313 one->is_binary = buffer_is_binary(one->data,
1314 one->size);
1315 if (one->is_binary == -1)
1316 one->is_binary = 0;
1317 }
1318 }
1319 return one->is_binary;
1320 }
1322 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1323 {
1324 diff_filespec_load_driver(one);
1325 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1326 }
1328 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1329 {
1330 if (!options->a_prefix)
1331 options->a_prefix = a;
1332 if (!options->b_prefix)
1333 options->b_prefix = b;
1334 }
1336 static const char *get_textconv(struct diff_filespec *one)
1337 {
1338 if (!DIFF_FILE_VALID(one))
1339 return NULL;
1340 if (!S_ISREG(one->mode))
1341 return NULL;
1342 diff_filespec_load_driver(one);
1343 return one->driver->textconv;
1344 }
1346 static void builtin_diff(const char *name_a,
1347 const char *name_b,
1348 struct diff_filespec *one,
1349 struct diff_filespec *two,
1350 const char *xfrm_msg,
1351 struct diff_options *o,
1352 int complete_rewrite)
1353 {
1354 mmfile_t mf1, mf2;
1355 const char *lbl[2];
1356 char *a_one, *b_two;
1357 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1358 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1359 const char *a_prefix, *b_prefix;
1360 const char *textconv_one = NULL, *textconv_two = NULL;
1362 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1363 textconv_one = get_textconv(one);
1364 textconv_two = get_textconv(two);
1365 }
1367 diff_set_mnemonic_prefix(o, "a/", "b/");
1368 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1369 a_prefix = o->b_prefix;
1370 b_prefix = o->a_prefix;
1371 } else {
1372 a_prefix = o->a_prefix;
1373 b_prefix = o->b_prefix;
1374 }
1376 /* Never use a non-valid filename anywhere if at all possible */
1377 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1378 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1380 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1381 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1382 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1383 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1384 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1385 if (lbl[0][0] == '/') {
1386 /* /dev/null */
1387 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
1388 if (xfrm_msg && xfrm_msg[0])
1389 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1390 }
1391 else if (lbl[1][0] == '/') {
1392 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1393 if (xfrm_msg && xfrm_msg[0])
1394 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1395 }
1396 else {
1397 if (one->mode != two->mode) {
1398 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1399 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
1400 }
1401 if (xfrm_msg && xfrm_msg[0])
1402 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1403 /*
1404 * we do not run diff between different kind
1405 * of objects.
1406 */
1407 if ((one->mode ^ two->mode) & S_IFMT)
1408 goto free_ab_and_return;
1409 if (complete_rewrite &&
1410 (textconv_one || !diff_filespec_is_binary(one)) &&
1411 (textconv_two || !diff_filespec_is_binary(two))) {
1412 emit_rewrite_diff(name_a, name_b, one, two,
1413 textconv_one, textconv_two, o);
1414 o->found_changes = 1;
1415 goto free_ab_and_return;
1416 }
1417 }
1419 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1420 die("unable to read files to diff");
1422 if (!DIFF_OPT_TST(o, TEXT) &&
1423 ( (diff_filespec_is_binary(one) && !textconv_one) ||
1424 (diff_filespec_is_binary(two) && !textconv_two) )) {
1425 /* Quite common confusing case */
1426 if (mf1.size == mf2.size &&
1427 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1428 goto free_ab_and_return;
1429 if (DIFF_OPT_TST(o, BINARY))
1430 emit_binary_diff(o->file, &mf1, &mf2);
1431 else
1432 fprintf(o->file, "Binary files %s and %s differ\n",
1433 lbl[0], lbl[1]);
1434 o->found_changes = 1;
1435 }
1436 else {
1437 /* Crazy xdl interfaces.. */
1438 const char *diffopts = getenv("GIT_DIFF_OPTS");
1439 xpparam_t xpp;
1440 xdemitconf_t xecfg;
1441 xdemitcb_t ecb;
1442 struct emit_callback ecbdata;
1443 const struct userdiff_funcname *pe;
1445 if (textconv_one) {
1446 size_t size;
1447 mf1.ptr = run_textconv(textconv_one, one, &size);
1448 if (!mf1.ptr)
1449 die("unable to read files to diff");
1450 mf1.size = size;
1451 }
1452 if (textconv_two) {
1453 size_t size;
1454 mf2.ptr = run_textconv(textconv_two, two, &size);
1455 if (!mf2.ptr)
1456 die("unable to read files to diff");
1457 mf2.size = size;
1458 }
1460 pe = diff_funcname_pattern(one);
1461 if (!pe)
1462 pe = diff_funcname_pattern(two);
1464 memset(&xpp, 0, sizeof(xpp));
1465 memset(&xecfg, 0, sizeof(xecfg));
1466 memset(&ecbdata, 0, sizeof(ecbdata));
1467 ecbdata.label_path = lbl;
1468 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1469 ecbdata.found_changesp = &o->found_changes;
1470 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1471 ecbdata.file = o->file;
1472 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1473 xecfg.ctxlen = o->context;
1474 xecfg.flags = XDL_EMIT_FUNCNAMES;
1475 if (pe)
1476 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1477 if (!diffopts)
1478 ;
1479 else if (!prefixcmp(diffopts, "--unified="))
1480 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1481 else if (!prefixcmp(diffopts, "-u"))
1482 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1483 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1484 ecbdata.diff_words =
1485 xcalloc(1, sizeof(struct diff_words_data));
1486 ecbdata.diff_words->file = o->file;
1487 }
1488 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1489 &xpp, &xecfg, &ecb);
1490 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1491 free_diff_words_data(&ecbdata);
1492 if (textconv_one)
1493 free(mf1.ptr);
1494 if (textconv_two)
1495 free(mf2.ptr);
1496 }
1498 free_ab_and_return:
1499 diff_free_filespec_data(one);
1500 diff_free_filespec_data(two);
1501 free(a_one);
1502 free(b_two);
1503 return;
1504 }
1506 static void builtin_diffstat(const char *name_a, const char *name_b,
1507 struct diff_filespec *one,
1508 struct diff_filespec *two,
1509 struct diffstat_t *diffstat,
1510 struct diff_options *o,
1511 int complete_rewrite)
1512 {
1513 mmfile_t mf1, mf2;
1514 struct diffstat_file *data;
1516 data = diffstat_add(diffstat, name_a, name_b);
1518 if (!one || !two) {
1519 data->is_unmerged = 1;
1520 return;
1521 }
1522 if (complete_rewrite) {
1523 diff_populate_filespec(one, 0);
1524 diff_populate_filespec(two, 0);
1525 data->deleted = count_lines(one->data, one->size);
1526 data->added = count_lines(two->data, two->size);
1527 goto free_and_return;
1528 }
1529 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1530 die("unable to read files to diff");
1532 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1533 data->is_binary = 1;
1534 data->added = mf2.size;
1535 data->deleted = mf1.size;
1536 } else {
1537 /* Crazy xdl interfaces.. */
1538 xpparam_t xpp;
1539 xdemitconf_t xecfg;
1540 xdemitcb_t ecb;
1542 memset(&xpp, 0, sizeof(xpp));
1543 memset(&xecfg, 0, sizeof(xecfg));
1544 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1545 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1546 &xpp, &xecfg, &ecb);
1547 }
1549 free_and_return:
1550 diff_free_filespec_data(one);
1551 diff_free_filespec_data(two);
1552 }
1554 static void builtin_checkdiff(const char *name_a, const char *name_b,
1555 const char *attr_path,
1556 struct diff_filespec *one,
1557 struct diff_filespec *two,
1558 struct diff_options *o)
1559 {
1560 mmfile_t mf1, mf2;
1561 struct checkdiff_t data;
1563 if (!two)
1564 return;
1566 memset(&data, 0, sizeof(data));
1567 data.filename = name_b ? name_b : name_a;
1568 data.lineno = 0;
1569 data.o = o;
1570 data.ws_rule = whitespace_rule(attr_path);
1572 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1573 die("unable to read files to diff");
1575 /*
1576 * All the other codepaths check both sides, but not checking
1577 * the "old" side here is deliberate. We are checking the newly
1578 * introduced changes, and as long as the "new" side is text, we
1579 * can and should check what it introduces.
1580 */
1581 if (diff_filespec_is_binary(two))
1582 goto free_and_return;
1583 else {
1584 /* Crazy xdl interfaces.. */
1585 xpparam_t xpp;
1586 xdemitconf_t xecfg;
1587 xdemitcb_t ecb;
1589 memset(&xpp, 0, sizeof(xpp));
1590 memset(&xecfg, 0, sizeof(xecfg));
1591 xecfg.ctxlen = 1; /* at least one context line */
1592 xpp.flags = XDF_NEED_MINIMAL;
1593 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1594 &xpp, &xecfg, &ecb);
1596 if ((data.ws_rule & WS_TRAILING_SPACE) &&
1597 data.trailing_blanks_start) {
1598 fprintf(o->file, "%s:%d: ends with blank lines.\n",
1599 data.filename, data.trailing_blanks_start);
1600 data.status = 1; /* report errors */
1601 }
1602 }
1603 free_and_return:
1604 diff_free_filespec_data(one);
1605 diff_free_filespec_data(two);
1606 if (data.status)
1607 DIFF_OPT_SET(o, CHECK_FAILED);
1608 }
1610 struct diff_filespec *alloc_filespec(const char *path)
1611 {
1612 int namelen = strlen(path);
1613 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1615 memset(spec, 0, sizeof(*spec));
1616 spec->path = (char *)(spec + 1);
1617 memcpy(spec->path, path, namelen+1);
1618 spec->count = 1;
1619 spec->is_binary = -1;
1620 return spec;
1621 }
1623 void free_filespec(struct diff_filespec *spec)
1624 {
1625 if (!--spec->count) {
1626 diff_free_filespec_data(spec);
1627 free(spec);
1628 }
1629 }
1631 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1632 unsigned short mode)
1633 {
1634 if (mode) {
1635 spec->mode = canon_mode(mode);
1636 hashcpy(spec->sha1, sha1);
1637 spec->sha1_valid = !is_null_sha1(sha1);
1638 }
1639 }
1641 /*
1642 * Given a name and sha1 pair, if the index tells us the file in
1643 * the work tree has that object contents, return true, so that
1644 * prepare_temp_file() does not have to inflate and extract.
1645 */
1646 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1647 {
1648 struct cache_entry *ce;
1649 struct stat st;
1650 int pos, len;
1652 /* We do not read the cache ourselves here, because the
1653 * benchmark with my previous version that always reads cache
1654 * shows that it makes things worse for diff-tree comparing
1655 * two linux-2.6 kernel trees in an already checked out work
1656 * tree. This is because most diff-tree comparisons deal with
1657 * only a small number of files, while reading the cache is
1658 * expensive for a large project, and its cost outweighs the
1659 * savings we get by not inflating the object to a temporary
1660 * file. Practically, this code only helps when we are used
1661 * by diff-cache --cached, which does read the cache before
1662 * calling us.
1663 */
1664 if (!active_cache)
1665 return 0;
1667 /* We want to avoid the working directory if our caller
1668 * doesn't need the data in a normal file, this system
1669 * is rather slow with its stat/open/mmap/close syscalls,
1670 * and the object is contained in a pack file. The pack
1671 * is probably already open and will be faster to obtain
1672 * the data through than the working directory. Loose
1673 * objects however would tend to be slower as they need
1674 * to be individually opened and inflated.
1675 */
1676 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1677 return 0;
1679 len = strlen(name);
1680 pos = cache_name_pos(name, len);
1681 if (pos < 0)
1682 return 0;
1683 ce = active_cache[pos];
1685 /*
1686 * This is not the sha1 we are looking for, or
1687 * unreusable because it is not a regular file.
1688 */
1689 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1690 return 0;
1692 /*
1693 * If ce matches the file in the work tree, we can reuse it.
1694 */
1695 if (ce_uptodate(ce) ||
1696 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1697 return 1;
1699 return 0;
1700 }
1702 static int populate_from_stdin(struct diff_filespec *s)
1703 {
1704 struct strbuf buf = STRBUF_INIT;
1705 size_t size = 0;
1707 if (strbuf_read(&buf, 0, 0) < 0)
1708 return error("error while reading from stdin %s",
1709 strerror(errno));
1711 s->should_munmap = 0;
1712 s->data = strbuf_detach(&buf, &size);
1713 s->size = size;
1714 s->should_free = 1;
1715 return 0;
1716 }
1718 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1719 {
1720 int len;
1721 char *data = xmalloc(100);
1722 len = snprintf(data, 100,
1723 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1724 s->data = data;
1725 s->size = len;
1726 s->should_free = 1;
1727 if (size_only) {
1728 s->data = NULL;
1729 free(data);
1730 }
1731 return 0;
1732 }
1734 /*
1735 * While doing rename detection and pickaxe operation, we may need to
1736 * grab the data for the blob (or file) for our own in-core comparison.
1737 * diff_filespec has data and size fields for this purpose.
1738 */
1739 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1740 {
1741 int err = 0;
1742 if (!DIFF_FILE_VALID(s))
1743 die("internal error: asking to populate invalid file.");
1744 if (S_ISDIR(s->mode))
1745 return -1;
1747 if (s->data)
1748 return 0;
1750 if (size_only && 0 < s->size)
1751 return 0;
1753 if (S_ISGITLINK(s->mode))
1754 return diff_populate_gitlink(s, size_only);
1756 if (!s->sha1_valid ||
1757 reuse_worktree_file(s->path, s->sha1, 0)) {
1758 struct strbuf buf = STRBUF_INIT;
1759 struct stat st;
1760 int fd;
1762 if (!strcmp(s->path, "-"))
1763 return populate_from_stdin(s);
1765 if (lstat(s->path, &st) < 0) {
1766 if (errno == ENOENT) {
1767 err_empty:
1768 err = -1;
1769 empty:
1770 s->data = (char *)"";
1771 s->size = 0;
1772 return err;
1773 }
1774 }
1775 s->size = xsize_t(st.st_size);
1776 if (!s->size)
1777 goto empty;
1778 if (S_ISLNK(st.st_mode)) {
1779 struct strbuf sb = STRBUF_INIT;
1781 if (strbuf_readlink(&sb, s->path, s->size))
1782 goto err_empty;
1783 s->size = sb.len;
1784 s->data = strbuf_detach(&sb, NULL);
1785 s->should_free = 1;
1786 return 0;
1787 }
1788 if (size_only)
1789 return 0;
1790 fd = open(s->path, O_RDONLY);
1791 if (fd < 0)
1792 goto err_empty;
1793 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1794 close(fd);
1795 s->should_munmap = 1;
1797 /*
1798 * Convert from working tree format to canonical git format
1799 */
1800 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
1801 size_t size = 0;
1802 munmap(s->data, s->size);
1803 s->should_munmap = 0;
1804 s->data = strbuf_detach(&buf, &size);
1805 s->size = size;
1806 s->should_free = 1;
1807 }
1808 }
1809 else {
1810 enum object_type type;
1811 if (size_only)
1812 type = sha1_object_info(s->sha1, &s->size);
1813 else {
1814 s->data = read_sha1_file(s->sha1, &type, &s->size);
1815 s->should_free = 1;
1816 }
1817 }
1818 return 0;
1819 }
1821 void diff_free_filespec_blob(struct diff_filespec *s)
1822 {
1823 if (s->should_free)
1824 free(s->data);
1825 else if (s->should_munmap)
1826 munmap(s->data, s->size);
1828 if (s->should_free || s->should_munmap) {
1829 s->should_free = s->should_munmap = 0;
1830 s->data = NULL;
1831 }
1832 }
1834 void diff_free_filespec_data(struct diff_filespec *s)
1835 {
1836 diff_free_filespec_blob(s);
1837 free(s->cnt_data);
1838 s->cnt_data = NULL;
1839 }
1841 static void prep_temp_blob(struct diff_tempfile *temp,
1842 void *blob,
1843 unsigned long size,
1844 const unsigned char *sha1,
1845 int mode)
1846 {
1847 int fd;
1849 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1850 if (fd < 0)
1851 die("unable to create temp-file: %s", strerror(errno));
1852 if (write_in_full(fd, blob, size) != size)
1853 die("unable to write temp-file");
1854 close(fd);
1855 temp->name = temp->tmp_path;
1856 strcpy(temp->hex, sha1_to_hex(sha1));
1857 temp->hex[40] = 0;
1858 sprintf(temp->mode, "%06o", mode);
1859 }
1861 static void prepare_temp_file(const char *name,
1862 struct diff_tempfile *temp,
1863 struct diff_filespec *one)
1864 {
1865 if (!DIFF_FILE_VALID(one)) {
1866 not_a_valid_file:
1867 /* A '-' entry produces this for file-2, and
1868 * a '+' entry produces this for file-1.
1869 */
1870 temp->name = "/dev/null";
1871 strcpy(temp->hex, ".");
1872 strcpy(temp->mode, ".");
1873 return;
1874 }
1876 if (!one->sha1_valid ||
1877 reuse_worktree_file(name, one->sha1, 1)) {
1878 struct stat st;
1879 if (lstat(name, &st) < 0) {
1880 if (errno == ENOENT)
1881 goto not_a_valid_file;
1882 die("stat(%s): %s", name, strerror(errno));
1883 }
1884 if (S_ISLNK(st.st_mode)) {
1885 int ret;
1886 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1887 ret = readlink(name, buf, sizeof(buf));
1888 if (ret < 0)
1889 die("readlink(%s)", name);
1890 if (ret == sizeof(buf))
1891 die("symlink too long: %s", name);
1892 prep_temp_blob(temp, buf, ret,
1893 (one->sha1_valid ?
1894 one->sha1 : null_sha1),
1895 (one->sha1_valid ?
1896 one->mode : S_IFLNK));
1897 }
1898 else {
1899 /* we can borrow from the file in the work tree */
1900 temp->name = name;
1901 if (!one->sha1_valid)
1902 strcpy(temp->hex, sha1_to_hex(null_sha1));
1903 else
1904 strcpy(temp->hex, sha1_to_hex(one->sha1));
1905 /* Even though we may sometimes borrow the
1906 * contents from the work tree, we always want
1907 * one->mode. mode is trustworthy even when
1908 * !(one->sha1_valid), as long as
1909 * DIFF_FILE_VALID(one).
1910 */
1911 sprintf(temp->mode, "%06o", one->mode);
1912 }
1913 return;
1914 }
1915 else {
1916 if (diff_populate_filespec(one, 0))
1917 die("cannot read data blob for %s", one->path);
1918 prep_temp_blob(temp, one->data, one->size,
1919 one->sha1, one->mode);
1920 }
1921 }
1923 static void remove_tempfile(void)
1924 {
1925 int i;
1927 for (i = 0; i < 2; i++)
1928 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1929 unlink(diff_temp[i].name);
1930 diff_temp[i].name = NULL;
1931 }
1932 }
1934 static void remove_tempfile_on_signal(int signo)
1935 {
1936 remove_tempfile();
1937 signal(SIGINT, SIG_DFL);
1938 raise(signo);
1939 }
1941 /* An external diff command takes:
1942 *
1943 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1944 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1945 *
1946 */
1947 static void run_external_diff(const char *pgm,
1948 const char *name,
1949 const char *other,
1950 struct diff_filespec *one,
1951 struct diff_filespec *two,
1952 const char *xfrm_msg,
1953 int complete_rewrite)
1954 {
1955 const char *spawn_arg[10];
1956 struct diff_tempfile *temp = diff_temp;
1957 int retval;
1958 static int atexit_asked = 0;
1959 const char *othername;
1960 const char **arg = &spawn_arg[0];
1962 othername = (other? other : name);
1963 if (one && two) {
1964 prepare_temp_file(name, &temp[0], one);
1965 prepare_temp_file(othername, &temp[1], two);
1966 if (! atexit_asked &&
1967 (temp[0].name == temp[0].tmp_path ||
1968 temp[1].name == temp[1].tmp_path)) {
1969 atexit_asked = 1;
1970 atexit(remove_tempfile);
1971 }
1972 signal(SIGINT, remove_tempfile_on_signal);
1973 }
1975 if (one && two) {
1976 *arg++ = pgm;
1977 *arg++ = name;
1978 *arg++ = temp[0].name;
1979 *arg++ = temp[0].hex;
1980 *arg++ = temp[0].mode;
1981 *arg++ = temp[1].name;
1982 *arg++ = temp[1].hex;
1983 *arg++ = temp[1].mode;
1984 if (other) {
1985 *arg++ = other;
1986 *arg++ = xfrm_msg;
1987 }
1988 } else {
1989 *arg++ = pgm;
1990 *arg++ = name;
1991 }
1992 *arg = NULL;
1993 fflush(NULL);
1994 retval = run_command_v_opt(spawn_arg, 0);
1995 remove_tempfile();
1996 if (retval) {
1997 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1998 exit(1);
1999 }
2000 }
2002 static int similarity_index(struct diff_filepair *p)
2003 {
2004 return p->score * 100 / MAX_SCORE;
2005 }
2007 static void fill_metainfo(struct strbuf *msg,
2008 const char *name,
2009 const char *other,
2010 struct diff_filespec *one,
2011 struct diff_filespec *two,
2012 struct diff_options *o,
2013 struct diff_filepair *p)
2014 {
2015 strbuf_init(msg, PATH_MAX * 2 + 300);
2016 switch (p->status) {
2017 case DIFF_STATUS_COPIED:
2018 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2019 strbuf_addstr(msg, "\ncopy from ");
2020 quote_c_style(name, msg, NULL, 0);
2021 strbuf_addstr(msg, "\ncopy to ");
2022 quote_c_style(other, msg, NULL, 0);
2023 strbuf_addch(msg, '\n');
2024 break;
2025 case DIFF_STATUS_RENAMED:
2026 strbuf_addf(msg, "similarity index %d%%", similarity_index(p));
2027 strbuf_addstr(msg, "\nrename from ");
2028 quote_c_style(name, msg, NULL, 0);
2029 strbuf_addstr(msg, "\nrename to ");
2030 quote_c_style(other, msg, NULL, 0);
2031 strbuf_addch(msg, '\n');
2032 break;
2033 case DIFF_STATUS_MODIFIED:
2034 if (p->score) {
2035 strbuf_addf(msg, "dissimilarity index %d%%\n",
2036 similarity_index(p));
2037 break;
2038 }
2039 /* fallthru */
2040 default:
2041 /* nothing */
2042 ;
2043 }
2044 if (one && two && hashcmp(one->sha1, two->sha1)) {
2045 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2047 if (DIFF_OPT_TST(o, BINARY)) {
2048 mmfile_t mf;
2049 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2050 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2051 abbrev = 40;
2052 }
2053 strbuf_addf(msg, "index %.*s..%.*s",
2054 abbrev, sha1_to_hex(one->sha1),
2055 abbrev, sha1_to_hex(two->sha1));
2056 if (one->mode == two->mode)
2057 strbuf_addf(msg, " %06o", one->mode);
2058 strbuf_addch(msg, '\n');
2059 }
2060 if (msg->len)
2061 strbuf_setlen(msg, msg->len - 1);
2062 }
2064 static void run_diff_cmd(const char *pgm,
2065 const char *name,
2066 const char *other,
2067 const char *attr_path,
2068 struct diff_filespec *one,
2069 struct diff_filespec *two,
2070 struct strbuf *msg,
2071 struct diff_options *o,
2072 struct diff_filepair *p)
2073 {
2074 const char *xfrm_msg = NULL;
2075 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2077 if (msg) {
2078 fill_metainfo(msg, name, other, one, two, o, p);
2079 xfrm_msg = msg->len ? msg->buf : NULL;
2080 }
2082 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2083 pgm = NULL;
2084 else {
2085 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2086 if (drv && drv->external)
2087 pgm = drv->external;
2088 }
2090 if (pgm) {
2091 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2092 complete_rewrite);
2093 return;
2094 }
2095 if (one && two)
2096 builtin_diff(name, other ? other : name,
2097 one, two, xfrm_msg, o, complete_rewrite);
2098 else
2099 fprintf(o->file, "* Unmerged path %s\n", name);
2100 }
2102 static void diff_fill_sha1_info(struct diff_filespec *one)
2103 {
2104 if (DIFF_FILE_VALID(one)) {
2105 if (!one->sha1_valid) {
2106 struct stat st;
2107 if (!strcmp(one->path, "-")) {
2108 hashcpy(one->sha1, null_sha1);
2109 return;
2110 }
2111 if (lstat(one->path, &st) < 0)
2112 die("stat %s", one->path);
2113 if (index_path(one->sha1, one->path, &st, 0))
2114 die("cannot hash %s\n", one->path);
2115 }
2116 }
2117 else
2118 hashclr(one->sha1);
2119 }
2121 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2122 {
2123 /* Strip the prefix but do not molest /dev/null and absolute paths */
2124 if (*namep && **namep != '/')
2125 *namep += prefix_length;
2126 if (*otherp && **otherp != '/')
2127 *otherp += prefix_length;
2128 }
2130 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2131 {
2132 const char *pgm = external_diff();
2133 struct strbuf msg;
2134 struct diff_filespec *one = p->one;
2135 struct diff_filespec *two = p->two;
2136 const char *name;
2137 const char *other;
2138 const char *attr_path;
2140 name = p->one->path;
2141 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2142 attr_path = name;
2143 if (o->prefix_length)
2144 strip_prefix(o->prefix_length, &name, &other);
2146 if (DIFF_PAIR_UNMERGED(p)) {
2147 run_diff_cmd(pgm, name, NULL, attr_path,
2148 NULL, NULL, NULL, o, p);
2149 return;
2150 }
2152 diff_fill_sha1_info(one);
2153 diff_fill_sha1_info(two);
2155 if (!pgm &&
2156 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2157 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2158 /*
2159 * a filepair that changes between file and symlink
2160 * needs to be split into deletion and creation.
2161 */
2162 struct diff_filespec *null = alloc_filespec(two->path);
2163 run_diff_cmd(NULL, name, other, attr_path,
2164 one, null, &msg, o, p);
2165 free(null);
2166 strbuf_release(&msg);
2168 null = alloc_filespec(one->path);
2169 run_diff_cmd(NULL, name, other, attr_path,
2170 null, two, &msg, o, p);
2171 free(null);
2172 }
2173 else
2174 run_diff_cmd(pgm, name, other, attr_path,
2175 one, two, &msg, o, p);
2177 strbuf_release(&msg);
2178 }
2180 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2181 struct diffstat_t *diffstat)
2182 {
2183 const char *name;
2184 const char *other;
2185 int complete_rewrite = 0;
2187 if (DIFF_PAIR_UNMERGED(p)) {
2188 /* unmerged */
2189 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2190 return;
2191 }
2193 name = p->one->path;
2194 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2196 if (o->prefix_length)
2197 strip_prefix(o->prefix_length, &name, &other);
2199 diff_fill_sha1_info(p->one);
2200 diff_fill_sha1_info(p->two);
2202 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2203 complete_rewrite = 1;
2204 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2205 }
2207 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2208 {
2209 const char *name;
2210 const char *other;
2211 const char *attr_path;
2213 if (DIFF_PAIR_UNMERGED(p)) {
2214 /* unmerged */
2215 return;
2216 }
2218 name = p->one->path;
2219 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2220 attr_path = other ? other : name;
2222 if (o->prefix_length)
2223 strip_prefix(o->prefix_length, &name, &other);
2225 diff_fill_sha1_info(p->one);
2226 diff_fill_sha1_info(p->two);
2228 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2229 }
2231 void diff_setup(struct diff_options *options)
2232 {
2233 memset(options, 0, sizeof(*options));
2235 options->file = stdout;
2237 options->line_termination = '\n';
2238 options->break_opt = -1;
2239 options->rename_limit = -1;
2240 options->dirstat_percent = 3;
2241 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
2242 options->context = 3;
2244 options->change = diff_change;
2245 options->add_remove = diff_addremove;
2246 if (diff_use_color_default > 0)
2247 DIFF_OPT_SET(options, COLOR_DIFF);
2248 else
2249 DIFF_OPT_CLR(options, COLOR_DIFF);
2250 options->detect_rename = diff_detect_rename_default;
2252 if (!diff_mnemonic_prefix) {
2253 options->a_prefix = "a/";
2254 options->b_prefix = "b/";
2255 }
2256 }
2258 int diff_setup_done(struct diff_options *options)
2259 {
2260 int count = 0;
2262 if (options->output_format & DIFF_FORMAT_NAME)
2263 count++;
2264 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2265 count++;
2266 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2267 count++;
2268 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2269 count++;
2270 if (count > 1)
2271 die("--name-only, --name-status, --check and -s are mutually exclusive");
2273 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2274 options->detect_rename = DIFF_DETECT_COPY;
2276 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2277 options->prefix = NULL;
2278 if (options->prefix)
2279 options->prefix_length = strlen(options->prefix);
2280 else
2281 options->prefix_length = 0;
2283 if (options->output_format & (DIFF_FORMAT_NAME |
2284 DIFF_FORMAT_NAME_STATUS |
2285 DIFF_FORMAT_CHECKDIFF |
2286 DIFF_FORMAT_NO_OUTPUT))
2287 options->output_format &= ~(DIFF_FORMAT_RAW |
2288 DIFF_FORMAT_NUMSTAT |
2289 DIFF_FORMAT_DIFFSTAT |
2290 DIFF_FORMAT_SHORTSTAT |
2291 DIFF_FORMAT_DIRSTAT |
2292 DIFF_FORMAT_SUMMARY |
2293 DIFF_FORMAT_PATCH);
2295 /*
2296 * These cases always need recursive; we do not drop caller-supplied
2297 * recursive bits for other formats here.
2298 */
2299 if (options->output_format & (DIFF_FORMAT_PATCH |
2300 DIFF_FORMAT_NUMSTAT |
2301 DIFF_FORMAT_DIFFSTAT |
2302 DIFF_FORMAT_SHORTSTAT |
2303 DIFF_FORMAT_DIRSTAT |
2304 DIFF_FORMAT_SUMMARY |
2305 DIFF_FORMAT_CHECKDIFF))
2306 DIFF_OPT_SET(options, RECURSIVE);
2307 /*
2308 * Also pickaxe would not work very well if you do not say recursive
2309 */
2310 if (options->pickaxe)
2311 DIFF_OPT_SET(options, RECURSIVE);
2313 if (options->detect_rename && options->rename_limit < 0)
2314 options->rename_limit = diff_rename_limit_default;
2315 if (options->setup & DIFF_SETUP_USE_CACHE) {
2316 if (!active_cache)
2317 /* read-cache does not die even when it fails
2318 * so it is safe for us to do this here. Also
2319 * it does not smudge active_cache or active_nr
2320 * when it fails, so we do not have to worry about
2321 * cleaning it up ourselves either.
2322 */
2323 read_cache();
2324 }
2325 if (options->abbrev <= 0 || 40 < options->abbrev)
2326 options->abbrev = 40; /* full */
2328 /*
2329 * It does not make sense to show the first hit we happened
2330 * to have found. It does not make sense not to return with
2331 * exit code in such a case either.
2332 */
2333 if (DIFF_OPT_TST(options, QUIET)) {
2334 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2335 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2336 }
2338 return 0;
2339 }
2341 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2342 {
2343 char c, *eq;
2344 int len;
2346 if (*arg != '-')
2347 return 0;
2348 c = *++arg;
2349 if (!c)
2350 return 0;
2351 if (c == arg_short) {
2352 c = *++arg;
2353 if (!c)
2354 return 1;
2355 if (val && isdigit(c)) {
2356 char *end;
2357 int n = strtoul(arg, &end, 10);
2358 if (*end)
2359 return 0;
2360 *val = n;
2361 return 1;
2362 }
2363 return 0;
2364 }
2365 if (c != '-')
2366 return 0;
2367 arg++;
2368 eq = strchr(arg, '=');
2369 if (eq)
2370 len = eq - arg;
2371 else
2372 len = strlen(arg);
2373 if (!len || strncmp(arg, arg_long, len))
2374 return 0;
2375 if (eq) {
2376 int n;
2377 char *end;
2378 if (!isdigit(*++eq))
2379 return 0;
2380 n = strtoul(eq, &end, 10);
2381 if (*end)
2382 return 0;
2383 *val = n;
2384 }
2385 return 1;
2386 }
2388 static int diff_scoreopt_parse(const char *opt);
2390 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2391 {
2392 const char *arg = av[0];
2394 /* Output format options */
2395 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2396 options->output_format |= DIFF_FORMAT_PATCH;
2397 else if (opt_arg(arg, 'U', "unified", &options->context))
2398 options->output_format |= DIFF_FORMAT_PATCH;
2399 else if (!strcmp(arg, "--raw"))
2400 options->output_format |= DIFF_FORMAT_RAW;
2401 else if (!strcmp(arg, "--patch-with-raw"))
2402 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2403 else if (!strcmp(arg, "--numstat"))
2404 options->output_format |= DIFF_FORMAT_NUMSTAT;
2405 else if (!strcmp(arg, "--shortstat"))
2406 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2407 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2408 options->output_format |= DIFF_FORMAT_DIRSTAT;
2409 else if (!strcmp(arg, "--cumulative")) {
2410 options->output_format |= DIFF_FORMAT_DIRSTAT;
2411 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2412 } else if (opt_arg(arg, 0, "dirstat-by-file",
2413 &options->dirstat_percent)) {
2414 options->output_format |= DIFF_FORMAT_DIRSTAT;
2415 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
2416 }
2417 else if (!strcmp(arg, "--check"))
2418 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2419 else if (!strcmp(arg, "--summary"))
2420 options->output_format |= DIFF_FORMAT_SUMMARY;
2421 else if (!strcmp(arg, "--patch-with-stat"))
2422 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2423 else if (!strcmp(arg, "--name-only"))
2424 options->output_format |= DIFF_FORMAT_NAME;
2425 else if (!strcmp(arg, "--name-status"))
2426 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2427 else if (!strcmp(arg, "-s"))
2428 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2429 else if (!prefixcmp(arg, "--stat")) {
2430 char *end;
2431 int width = options->stat_width;
2432 int name_width = options->stat_name_width;
2433 arg += 6;
2434 end = (char *)arg;
2436 switch (*arg) {
2437 case '-':
2438 if (!prefixcmp(arg, "-width="))
2439 width = strtoul(arg + 7, &end, 10);
2440 else if (!prefixcmp(arg, "-name-width="))
2441 name_width = strtoul(arg + 12, &end, 10);
2442 break;
2443 case '=':
2444 width = strtoul(arg+1, &end, 10);
2445 if (*end == ',')
2446 name_width = strtoul(end+1, &end, 10);
2447 }
2449 /* Important! This checks all the error cases! */
2450 if (*end)
2451 return 0;
2452 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2453 options->stat_name_width = name_width;
2454 options->stat_width = width;
2455 }
2457 /* renames options */
2458 else if (!prefixcmp(arg, "-B")) {
2459 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2460 return -1;
2461 }
2462 else if (!prefixcmp(arg, "-M")) {
2463 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2464 return -1;
2465 options->detect_rename = DIFF_DETECT_RENAME;
2466 }
2467 else if (!prefixcmp(arg, "-C")) {
2468 if (options->detect_rename == DIFF_DETECT_COPY)
2469 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2470 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2471 return -1;
2472 options->detect_rename = DIFF_DETECT_COPY;
2473 }
2474 else if (!strcmp(arg, "--no-renames"))
2475 options->detect_rename = 0;
2476 else if (!strcmp(arg, "--relative"))
2477 DIFF_OPT_SET(options, RELATIVE_NAME);
2478 else if (!prefixcmp(arg, "--relative=")) {
2479 DIFF_OPT_SET(options, RELATIVE_NAME);
2480 options->prefix = arg + 11;
2481 }
2483 /* xdiff options */
2484 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2485 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2486 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2487 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2488 else if (!strcmp(arg, "--ignore-space-at-eol"))
2489 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2491 /* flags options */
2492 else if (!strcmp(arg, "--binary")) {
2493 options->output_format |= DIFF_FORMAT_PATCH;
2494 DIFF_OPT_SET(options, BINARY);
2495 }
2496 else if (!strcmp(arg, "--full-index"))
2497 DIFF_OPT_SET(options, FULL_INDEX);
2498 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2499 DIFF_OPT_SET(options, TEXT);
2500 else if (!strcmp(arg, "-R"))
2501 DIFF_OPT_SET(options, REVERSE_DIFF);
2502 else if (!strcmp(arg, "--find-copies-harder"))
2503 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2504 else if (!strcmp(arg, "--follow"))
2505 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2506 else if (!strcmp(arg, "--color"))
2507 DIFF_OPT_SET(options, COLOR_DIFF);
2508 else if (!strcmp(arg, "--no-color"))
2509 DIFF_OPT_CLR(options, COLOR_DIFF);
2510 else if (!strcmp(arg, "--color-words"))
2511 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2512 else if (!strcmp(arg, "--exit-code"))
2513 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2514 else if (!strcmp(arg, "--quiet"))
2515 DIFF_OPT_SET(options, QUIET);
2516 else if (!strcmp(arg, "--ext-diff"))
2517 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2518 else if (!strcmp(arg, "--no-ext-diff"))
2519 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2520 else if (!strcmp(arg, "--textconv"))
2521 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
2522 else if (!strcmp(arg, "--no-textconv"))
2523 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
2524 else if (!strcmp(arg, "--ignore-submodules"))
2525 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2527 /* misc options */
2528 else if (!strcmp(arg, "-z"))
2529 options->line_termination = 0;
2530 else if (!prefixcmp(arg, "-l"))
2531 options->rename_limit = strtoul(arg+2, NULL, 10);
2532 else if (!prefixcmp(arg, "-S"))
2533 options->pickaxe = arg + 2;
2534 else if (!strcmp(arg, "--pickaxe-all"))
2535 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2536 else if (!strcmp(arg, "--pickaxe-regex"))
2537 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2538 else if (!prefixcmp(arg, "-O"))
2539 options->orderfile = arg + 2;
2540 else if (!prefixcmp(arg, "--diff-filter="))
2541 options->filter = arg + 14;
2542 else if (!strcmp(arg, "--abbrev"))
2543 options->abbrev = DEFAULT_ABBREV;
2544 else if (!prefixcmp(arg, "--abbrev=")) {
2545 options->abbrev = strtoul(arg + 9, NULL, 10);
2546 if (options->abbrev < MINIMUM_ABBREV)
2547 options->abbrev = MINIMUM_ABBREV;
2548 else if (40 < options->abbrev)
2549 options->abbrev = 40;
2550 }
2551 else if (!prefixcmp(arg, "--src-prefix="))
2552 options->a_prefix = arg + 13;
2553 else if (!prefixcmp(arg, "--dst-prefix="))
2554 options->b_prefix = arg + 13;
2555 else if (!strcmp(arg, "--no-prefix"))
2556 options->a_prefix = options->b_prefix = "";
2557 else if (!prefixcmp(arg, "--output=")) {
2558 options->file = fopen(arg + strlen("--output="), "w");
2559 options->close_file = 1;
2560 } else
2561 return 0;
2562 return 1;
2563 }
2565 static int parse_num(const char **cp_p)
2566 {
2567 unsigned long num, scale;
2568 int ch, dot;
2569 const char *cp = *cp_p;
2571 num = 0;
2572 scale = 1;
2573 dot = 0;
2574 for(;;) {
2575 ch = *cp;
2576 if ( !dot && ch == '.' ) {
2577 scale = 1;
2578 dot = 1;
2579 } else if ( ch == '%' ) {
2580 scale = dot ? scale*100 : 100;
2581 cp++; /* % is always at the end */
2582 break;
2583 } else if ( ch >= '0' && ch <= '9' ) {
2584 if ( scale < 100000 ) {
2585 scale *= 10;
2586 num = (num*10) + (ch-'0');
2587 }
2588 } else {
2589 break;
2590 }
2591 cp++;
2592 }
2593 *cp_p = cp;
2595 /* user says num divided by scale and we say internally that
2596 * is MAX_SCORE * num / scale.
2597 */
2598 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2599 }
2601 static int diff_scoreopt_parse(const char *opt)
2602 {
2603 int opt1, opt2, cmd;
2605 if (*opt++ != '-')
2606 return -1;
2607 cmd = *opt++;
2608 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2609 return -1; /* that is not a -M, -C nor -B option */
2611 opt1 = parse_num(&opt);
2612 if (cmd != 'B')
2613 opt2 = 0;
2614 else {
2615 if (*opt == 0)
2616 opt2 = 0;
2617 else if (*opt != '/')
2618 return -1; /* we expect -B80/99 or -B80 */
2619 else {
2620 opt++;
2621 opt2 = parse_num(&opt);
2622 }
2623 }
2624 if (*opt != 0)
2625 return -1;
2626 return opt1 | (opt2 << 16);
2627 }
2629 struct diff_queue_struct diff_queued_diff;
2631 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2632 {
2633 if (queue->alloc <= queue->nr) {
2634 queue->alloc = alloc_nr(queue->alloc);
2635 queue->queue = xrealloc(queue->queue,
2636 sizeof(dp) * queue->alloc);
2637 }
2638 queue->queue[queue->nr++] = dp;
2639 }
2641 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2642 struct diff_filespec *one,
2643 struct diff_filespec *two)
2644 {
2645 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2646 dp->one = one;
2647 dp->two = two;
2648 if (queue)
2649 diff_q(queue, dp);
2650 return dp;
2651 }
2653 void diff_free_filepair(struct diff_filepair *p)
2654 {
2655 free_filespec(p->one);
2656 free_filespec(p->two);
2657 free(p);
2658 }
2660 /* This is different from find_unique_abbrev() in that
2661 * it stuffs the result with dots for alignment.
2662 */
2663 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2664 {
2665 int abblen;
2666 const char *abbrev;
2667 if (len == 40)
2668 return sha1_to_hex(sha1);
2670 abbrev = find_unique_abbrev(sha1, len);
2671 abblen = strlen(abbrev);
2672 if (abblen < 37) {
2673 static char hex[41];
2674 if (len < abblen && abblen <= len + 2)
2675 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2676 else
2677 sprintf(hex, "%s...", abbrev);
2678 return hex;
2679 }
2680 return sha1_to_hex(sha1);
2681 }
2683 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2684 {
2685 int line_termination = opt->line_termination;
2686 int inter_name_termination = line_termination ? '\t' : '\0';
2688 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2689 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2690 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2691 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2692 }
2693 if (p->score) {
2694 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2695 inter_name_termination);
2696 } else {
2697 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2698 }
2700 if (p->status == DIFF_STATUS_COPIED ||
2701 p->status == DIFF_STATUS_RENAMED) {
2702 const char *name_a, *name_b;
2703 name_a = p->one->path;
2704 name_b = p->two->path;
2705 strip_prefix(opt->prefix_length, &name_a, &name_b);
2706 write_name_quoted(name_a, opt->file, inter_name_termination);
2707 write_name_quoted(name_b, opt->file, line_termination);
2708 } else {
2709 const char *name_a, *name_b;
2710 name_a = p->one->mode ? p->one->path : p->two->path;
2711 name_b = NULL;
2712 strip_prefix(opt->prefix_length, &name_a, &name_b);
2713 write_name_quoted(name_a, opt->file, line_termination);
2714 }
2715 }
2717 int diff_unmodified_pair(struct diff_filepair *p)
2718 {
2719 /* This function is written stricter than necessary to support
2720 * the currently implemented transformers, but the idea is to
2721 * let transformers to produce diff_filepairs any way they want,
2722 * and filter and clean them up here before producing the output.
2723 */
2724 struct diff_filespec *one = p->one, *two = p->two;
2726 if (DIFF_PAIR_UNMERGED(p))
2727 return 0; /* unmerged is interesting */
2729 /* deletion, addition, mode or type change
2730 * and rename are all interesting.
2731 */
2732 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2733 DIFF_PAIR_MODE_CHANGED(p) ||
2734 strcmp(one->path, two->path))
2735 return 0;
2737 /* both are valid and point at the same path. that is, we are
2738 * dealing with a change.
2739 */
2740 if (one->sha1_valid && two->sha1_valid &&
2741 !hashcmp(one->sha1, two->sha1))
2742 return 1; /* no change */
2743 if (!one->sha1_valid && !two->sha1_valid)
2744 return 1; /* both look at the same file on the filesystem. */
2745 return 0;
2746 }
2748 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2749 {
2750 if (diff_unmodified_pair(p))
2751 return;
2753 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2754 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2755 return; /* no tree diffs in patch format */
2757 run_diff(p, o);
2758 }
2760 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2761 struct diffstat_t *diffstat)
2762 {
2763 if (diff_unmodified_pair(p))
2764 return;
2766 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2767 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2768 return; /* no tree diffs in patch format */
2770 run_diffstat(p, o, diffstat);
2771 }
2773 static void diff_flush_checkdiff(struct diff_filepair *p,
2774 struct diff_options *o)
2775 {
2776 if (diff_unmodified_pair(p))
2777 return;
2779 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2780 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2781 return; /* no tree diffs in patch format */
2783 run_checkdiff(p, o);
2784 }
2786 int diff_queue_is_empty(void)
2787 {
2788 struct diff_queue_struct *q = &diff_queued_diff;
2789 int i;
2790 for (i = 0; i < q->nr; i++)
2791 if (!diff_unmodified_pair(q->queue[i]))
2792 return 0;
2793 return 1;
2794 }
2796 #if DIFF_DEBUG
2797 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2798 {
2799 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2800 x, one ? one : "",
2801 s->path,
2802 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2803 s->mode,
2804 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2805 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2806 x, one ? one : "",
2807 s->size, s->xfrm_flags);
2808 }
2810 void diff_debug_filepair(const struct diff_filepair *p, int i)
2811 {
2812 diff_debug_filespec(p->one, i, "one");
2813 diff_debug_filespec(p->two, i, "two");
2814 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2815 p->score, p->status ? p->status : '?',
2816 p->one->rename_used, p->broken_pair);
2817 }
2819 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2820 {
2821 int i;
2822 if (msg)
2823 fprintf(stderr, "%s\n", msg);
2824 fprintf(stderr, "q->nr = %d\n", q->nr);
2825 for (i = 0; i < q->nr; i++) {
2826 struct diff_filepair *p = q->queue[i];
2827 diff_debug_filepair(p, i);
2828 }
2829 }
2830 #endif
2832 static void diff_resolve_rename_copy(void)
2833 {
2834 int i;
2835 struct diff_filepair *p;
2836 struct diff_queue_struct *q = &diff_queued_diff;
2838 diff_debug_queue("resolve-rename-copy", q);
2840 for (i = 0; i < q->nr; i++) {
2841 p = q->queue[i];
2842 p->status = 0; /* undecided */
2843 if (DIFF_PAIR_UNMERGED(p))
2844 p->status = DIFF_STATUS_UNMERGED;
2845 else if (!DIFF_FILE_VALID(p->one))
2846 p->status = DIFF_STATUS_ADDED;
2847 else if (!DIFF_FILE_VALID(p->two))
2848 p->status = DIFF_STATUS_DELETED;
2849 else if (DIFF_PAIR_TYPE_CHANGED(p))
2850 p->status = DIFF_STATUS_TYPE_CHANGED;
2852 /* from this point on, we are dealing with a pair
2853 * whose both sides are valid and of the same type, i.e.
2854 * either in-place edit or rename/copy edit.
2855 */
2856 else if (DIFF_PAIR_RENAME(p)) {
2857 /*
2858 * A rename might have re-connected a broken
2859 * pair up, causing the pathnames to be the
2860 * same again. If so, that's not a rename at
2861 * all, just a modification..
2862 *
2863 * Otherwise, see if this source was used for
2864 * multiple renames, in which case we decrement
2865 * the count, and call it a copy.
2866 */
2867 if (!strcmp(p->one->path, p->two->path))
2868 p->status = DIFF_STATUS_MODIFIED;
2869 else if (--p->one->rename_used > 0)
2870 p->status = DIFF_STATUS_COPIED;
2871 else
2872 p->status = DIFF_STATUS_RENAMED;
2873 }
2874 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2875 p->one->mode != p->two->mode ||
2876 is_null_sha1(p->one->sha1))
2877 p->status = DIFF_STATUS_MODIFIED;
2878 else {
2879 /* This is a "no-change" entry and should not
2880 * happen anymore, but prepare for broken callers.
2881 */
2882 error("feeding unmodified %s to diffcore",
2883 p->one->path);
2884 p->status = DIFF_STATUS_UNKNOWN;
2885 }
2886 }
2887 diff_debug_queue("resolve-rename-copy done", q);
2888 }
2890 static int check_pair_status(struct diff_filepair *p)
2891 {
2892 switch (p->status) {
2893 case DIFF_STATUS_UNKNOWN:
2894 return 0;
2895 case 0:
2896 die("internal error in diff-resolve-rename-copy");
2897 default:
2898 return 1;
2899 }
2900 }
2902 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2903 {
2904 int fmt = opt->output_format;
2906 if (fmt & DIFF_FORMAT_CHECKDIFF)
2907 diff_flush_checkdiff(p, opt);
2908 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2909 diff_flush_raw(p, opt);
2910 else if (fmt & DIFF_FORMAT_NAME) {
2911 const char *name_a, *name_b;
2912 name_a = p->two->path;
2913 name_b = NULL;
2914 strip_prefix(opt->prefix_length, &name_a, &name_b);
2915 write_name_quoted(name_a, opt->file, opt->line_termination);
2916 }
2917 }
2919 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
2920 {
2921 if (fs->mode)
2922 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
2923 else
2924 fprintf(file, " %s ", newdelete);
2925 write_name_quoted(fs->path, file, '\n');
2926 }
2929 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
2930 {
2931 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2932 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
2933 show_name ? ' ' : '\n');
2934 if (show_name) {
2935 write_name_quoted(p->two->path, file, '\n');
2936 }
2937 }
2938 }
2940 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
2941 {
2942 char *names = pprint_rename(p->one->path, p->two->path);
2944 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
2945 free(names);
2946 show_mode_change(file, p, 0);
2947 }
2949 static void diff_summary(FILE *file, struct diff_filepair *p)
2950 {
2951 switch(p->status) {
2952 case DIFF_STATUS_DELETED:
2953 show_file_mode_name(file, "delete", p->one);
2954 break;
2955 case DIFF_STATUS_ADDED:
2956 show_file_mode_name(file, "create", p->two);
2957 break;
2958 case DIFF_STATUS_COPIED:
2959 show_rename_copy(file, "copy", p);
2960 break;
2961 case DIFF_STATUS_RENAMED:
2962 show_rename_copy(file, "rename", p);
2963 break;
2964 default:
2965 if (p->score) {
2966 fputs(" rewrite ", file);
2967 write_name_quoted(p->two->path, file, ' ');
2968 fprintf(file, "(%d%%)\n", similarity_index(p));
2969 }
2970 show_mode_change(file, p, !p->score);
2971 break;
2972 }
2973 }
2975 struct patch_id_t {
2976 git_SHA_CTX *ctx;
2977 int patchlen;
2978 };
2980 static int remove_space(char *line, int len)
2981 {
2982 int i;
2983 char *dst = line;
2984 unsigned char c;
2986 for (i = 0; i < len; i++)
2987 if (!isspace((c = line[i])))
2988 *dst++ = c;
2990 return dst - line;
2991 }
2993 static void patch_id_consume(void *priv, char *line, unsigned long len)
2994 {
2995 struct patch_id_t *data = priv;
2996 int new_len;
2998 /* Ignore line numbers when computing the SHA1 of the patch */
2999 if (!prefixcmp(line, "@@ -"))
3000 return;
3002 new_len = remove_space(line, len);
3004 git_SHA1_Update(data->ctx, line, new_len);
3005 data->patchlen += new_len;
3006 }
3008 /* returns 0 upon success, and writes result into sha1 */
3009 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3010 {
3011 struct diff_queue_struct *q = &diff_queued_diff;
3012 int i;
3013 git_SHA_CTX ctx;
3014 struct patch_id_t data;
3015 char buffer[PATH_MAX * 4 + 20];
3017 git_SHA1_Init(&ctx);
3018 memset(&data, 0, sizeof(struct patch_id_t));
3019 data.ctx = &ctx;
3021 for (i = 0; i < q->nr; i++) {
3022 xpparam_t xpp;
3023 xdemitconf_t xecfg;
3024 xdemitcb_t ecb;
3025 mmfile_t mf1, mf2;
3026 struct diff_filepair *p = q->queue[i];
3027 int len1, len2;
3029 memset(&xpp, 0, sizeof(xpp));
3030 memset(&xecfg, 0, sizeof(xecfg));
3031 if (p->status == 0)
3032 return error("internal diff status error");
3033 if (p->status == DIFF_STATUS_UNKNOWN)
3034 continue;
3035 if (diff_unmodified_pair(p))
3036 continue;
3037 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3038 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3039 continue;
3040 if (DIFF_PAIR_UNMERGED(p))
3041 continue;
3043 diff_fill_sha1_info(p->one);
3044 diff_fill_sha1_info(p->two);
3045 if (fill_mmfile(&mf1, p->one) < 0 ||
3046 fill_mmfile(&mf2, p->two) < 0)
3047 return error("unable to read files to diff");
3049 len1 = remove_space(p->one->path, strlen(p->one->path));
3050 len2 = remove_space(p->two->path, strlen(p->two->path));
3051 if (p->one->mode == 0)
3052 len1 = snprintf(buffer, sizeof(buffer),
3053 "diff--gita/%.*sb/%.*s"
3054 "newfilemode%06o"
3055 "---/dev/null"
3056 "+++b/%.*s",
3057 len1, p->one->path,
3058 len2, p->two->path,
3059 p->two->mode,
3060 len2, p->two->path);
3061 else if (p->two->mode == 0)
3062 len1 = snprintf(buffer, sizeof(buffer),
3063 "diff--gita/%.*sb/%.*s"
3064 "deletedfilemode%06o"
3065 "---a/%.*s"
3066 "+++/dev/null",
3067 len1, p->one->path,
3068 len2, p->two->path,
3069 p->one->mode,
3070 len1, p->one->path);
3071 else
3072 len1 = snprintf(buffer, sizeof(buffer),
3073 "diff--gita/%.*sb/%.*s"
3074 "---a/%.*s"
3075 "+++b/%.*s",
3076 len1, p->one->path,
3077 len2, p->two->path,
3078 len1, p->one->path,
3079 len2, p->two->path);
3080 git_SHA1_Update(&ctx, buffer, len1);
3082 xpp.flags = XDF_NEED_MINIMAL;
3083 xecfg.ctxlen = 3;
3084 xecfg.flags = XDL_EMIT_FUNCNAMES;
3085 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3086 &xpp, &xecfg, &ecb);
3087 }
3089 git_SHA1_Final(sha1, &ctx);
3090 return 0;
3091 }
3093 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3094 {
3095 struct diff_queue_struct *q = &diff_queued_diff;
3096 int i;
3097 int result = diff_get_patch_id(options, sha1);
3099 for (i = 0; i < q->nr; i++)
3100 diff_free_filepair(q->queue[i]);
3102 free(q->queue);
3103 q->queue = NULL;
3104 q->nr = q->alloc = 0;
3106 return result;
3107 }
3109 static int is_summary_empty(const struct diff_queue_struct *q)
3110 {
3111 int i;
3113 for (i = 0; i < q->nr; i++) {
3114 const struct diff_filepair *p = q->queue[i];
3116 switch (p->status) {
3117 case DIFF_STATUS_DELETED:
3118 case DIFF_STATUS_ADDED:
3119 case DIFF_STATUS_COPIED:
3120 case DIFF_STATUS_RENAMED:
3121 return 0;
3122 default:
3123 if (p->score)
3124 return 0;
3125 if (p->one->mode && p->two->mode &&
3126 p->one->mode != p->two->mode)
3127 return 0;
3128 break;
3129 }
3130 }
3131 return 1;
3132 }
3134 void diff_flush(struct diff_options *options)
3135 {
3136 struct diff_queue_struct *q = &diff_queued_diff;
3137 int i, output_format = options->output_format;
3138 int separator = 0;
3140 /*
3141 * Order: raw, stat, summary, patch
3142 * or: name/name-status/checkdiff (other bits clear)
3143 */
3144 if (!q->nr)
3145 goto free_queue;
3147 if (output_format & (DIFF_FORMAT_RAW |
3148 DIFF_FORMAT_NAME |
3149 DIFF_FORMAT_NAME_STATUS |
3150 DIFF_FORMAT_CHECKDIFF)) {
3151 for (i = 0; i < q->nr; i++) {
3152 struct diff_filepair *p = q->queue[i];
3153 if (check_pair_status(p))
3154 flush_one_pair(p, options);
3155 }
3156 separator++;
3157 }
3159 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3160 struct diffstat_t diffstat;
3162 memset(&diffstat, 0, sizeof(struct diffstat_t));
3163 for (i = 0; i < q->nr; i++) {
3164 struct diff_filepair *p = q->queue[i];
3165 if (check_pair_status(p))
3166 diff_flush_stat(p, options, &diffstat);
3167 }
3168 if (output_format & DIFF_FORMAT_NUMSTAT)
3169 show_numstat(&diffstat, options);
3170 if (output_format & DIFF_FORMAT_DIFFSTAT)
3171 show_stats(&diffstat, options);
3172 if (output_format & DIFF_FORMAT_SHORTSTAT)
3173 show_shortstats(&diffstat, options);
3174 free_diffstat_info(&diffstat);
3175 separator++;
3176 }
3177 if (output_format & DIFF_FORMAT_DIRSTAT)
3178 show_dirstat(options);
3180 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3181 for (i = 0; i < q->nr; i++)
3182 diff_summary(options->file, q->queue[i]);
3183 separator++;
3184 }
3186 if (output_format & DIFF_FORMAT_PATCH) {
3187 if (separator) {
3188 putc(options->line_termination, options->file);
3189 if (options->stat_sep) {
3190 /* attach patch instead of inline */
3191 fputs(options->stat_sep, options->file);
3192 }
3193 }
3195 for (i = 0; i < q->nr; i++) {
3196 struct diff_filepair *p = q->queue[i];
3197 if (check_pair_status(p))
3198 diff_flush_patch(p, options);
3199 }
3200 }
3202 if (output_format & DIFF_FORMAT_CALLBACK)
3203 options->format_callback(q, options, options->format_callback_data);
3205 for (i = 0; i < q->nr; i++)
3206 diff_free_filepair(q->queue[i]);
3207 free_queue:
3208 free(q->queue);
3209 q->queue = NULL;
3210 q->nr = q->alloc = 0;
3211 if (options->close_file)
3212 fclose(options->file);
3213 }
3215 static void diffcore_apply_filter(const char *filter)
3216 {
3217 int i;
3218 struct diff_queue_struct *q = &diff_queued_diff;
3219 struct diff_queue_struct outq;
3220 outq.queue = NULL;
3221 outq.nr = outq.alloc = 0;
3223 if (!filter)
3224 return;
3226 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3227 int found;
3228 for (i = found = 0; !found && i < q->nr; i++) {
3229 struct diff_filepair *p = q->queue[i];
3230 if (((p->status == DIFF_STATUS_MODIFIED) &&
3231 ((p->score &&
3232 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3233 (!p->score &&
3234 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3235 ((p->status != DIFF_STATUS_MODIFIED) &&
3236 strchr(filter, p->status)))
3237 found++;
3238 }
3239 if (found)
3240 return;
3242 /* otherwise we will clear the whole queue
3243 * by copying the empty outq at the end of this
3244 * function, but first clear the current entries
3245 * in the queue.
3246 */
3247 for (i = 0; i < q->nr; i++)
3248 diff_free_filepair(q->queue[i]);
3249 }
3250 else {
3251 /* Only the matching ones */
3252 for (i = 0; i < q->nr; i++) {
3253 struct diff_filepair *p = q->queue[i];
3255 if (((p->status == DIFF_STATUS_MODIFIED) &&
3256 ((p->score &&
3257 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3258 (!p->score &&
3259 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3260 ((p->status != DIFF_STATUS_MODIFIED) &&
3261 strchr(filter, p->status)))
3262 diff_q(&outq, p);
3263 else
3264 diff_free_filepair(p);
3265 }
3266 }
3267 free(q->queue);
3268 *q = outq;
3269 }
3271 /* Check whether two filespecs with the same mode and size are identical */
3272 static int diff_filespec_is_identical(struct diff_filespec *one,
3273 struct diff_filespec *two)
3274 {
3275 if (S_ISGITLINK(one->mode))
3276 return 0;
3277 if (diff_populate_filespec(one, 0))
3278 return 0;
3279 if (diff_populate_filespec(two, 0))
3280 return 0;
3281 return !memcmp(one->data, two->data, one->size);
3282 }
3284 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3285 {
3286 int i;
3287 struct diff_queue_struct *q = &diff_queued_diff;
3288 struct diff_queue_struct outq;
3289 outq.queue = NULL;
3290 outq.nr = outq.alloc = 0;
3292 for (i = 0; i < q->nr; i++) {
3293 struct diff_filepair *p = q->queue[i];
3295 /*
3296 * 1. Entries that come from stat info dirtyness
3297 * always have both sides (iow, not create/delete),
3298 * one side of the object name is unknown, with
3299 * the same mode and size. Keep the ones that
3300 * do not match these criteria. They have real
3301 * differences.
3302 *
3303 * 2. At this point, the file is known to be modified,
3304 * with the same mode and size, and the object
3305 * name of one side is unknown. Need to inspect
3306 * the identical contents.
3307 */
3308 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3309 !DIFF_FILE_VALID(p->two) ||
3310 (p->one->sha1_valid && p->two->sha1_valid) ||
3311 (p->one->mode != p->two->mode) ||
3312 diff_populate_filespec(p->one, 1) ||
3313 diff_populate_filespec(p->two, 1) ||
3314 (p->one->size != p->two->size) ||
3315 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3316 diff_q(&outq, p);
3317 else {
3318 /*
3319 * The caller can subtract 1 from skip_stat_unmatch
3320 * to determine how many paths were dirty only
3321 * due to stat info mismatch.
3322 */
3323 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3324 diffopt->skip_stat_unmatch++;
3325 diff_free_filepair(p);
3326 }
3327 }
3328 free(q->queue);
3329 *q = outq;
3330 }
3332 void diffcore_std(struct diff_options *options)
3333 {
3334 if (options->skip_stat_unmatch)
3335 diffcore_skip_stat_unmatch(options);
3336 if (options->break_opt != -1)
3337 diffcore_break(options->break_opt);
3338 if (options->detect_rename)
3339 diffcore_rename(options);
3340 if (options->break_opt != -1)
3341 diffcore_merge_broken();
3342 if (options->pickaxe)
3343 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3344 if (options->orderfile)
3345 diffcore_order(options->orderfile);
3346 diff_resolve_rename_copy();
3347 diffcore_apply_filter(options->filter);
3349 if (diff_queued_diff.nr)
3350 DIFF_OPT_SET(options, HAS_CHANGES);
3351 else
3352 DIFF_OPT_CLR(options, HAS_CHANGES);
3353 }
3355 int diff_result_code(struct diff_options *opt, int status)
3356 {
3357 int result = 0;
3358 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3359 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3360 return status;
3361 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3362 DIFF_OPT_TST(opt, HAS_CHANGES))
3363 result |= 01;
3364 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3365 DIFF_OPT_TST(opt, CHECK_FAILED))
3366 result |= 02;
3367 return result;
3368 }
3370 void diff_addremove(struct diff_options *options,
3371 int addremove, unsigned mode,
3372 const unsigned char *sha1,
3373 const char *concatpath)
3374 {
3375 struct diff_filespec *one, *two;
3377 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3378 return;
3380 /* This may look odd, but it is a preparation for
3381 * feeding "there are unchanged files which should
3382 * not produce diffs, but when you are doing copy
3383 * detection you would need them, so here they are"
3384 * entries to the diff-core. They will be prefixed
3385 * with something like '=' or '*' (I haven't decided
3386 * which but should not make any difference).
3387 * Feeding the same new and old to diff_change()
3388 * also has the same effect.
3389 * Before the final output happens, they are pruned after
3390 * merged into rename/copy pairs as appropriate.
3391 */
3392 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3393 addremove = (addremove == '+' ? '-' :
3394 addremove == '-' ? '+' : addremove);
3396 if (options->prefix &&
3397 strncmp(concatpath, options->prefix, options->prefix_length))
3398 return;
3400 one = alloc_filespec(concatpath);
3401 two = alloc_filespec(concatpath);
3403 if (addremove != '+')
3404 fill_filespec(one, sha1, mode);
3405 if (addremove != '-')
3406 fill_filespec(two, sha1, mode);
3408 diff_queue(&diff_queued_diff, one, two);
3409 DIFF_OPT_SET(options, HAS_CHANGES);
3410 }
3412 void diff_change(struct diff_options *options,
3413 unsigned old_mode, unsigned new_mode,
3414 const unsigned char *old_sha1,
3415 const unsigned char *new_sha1,
3416 const char *concatpath)
3417 {
3418 struct diff_filespec *one, *two;
3420 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3421 && S_ISGITLINK(new_mode))
3422 return;
3424 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3425 unsigned tmp;
3426 const unsigned char *tmp_c;
3427 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3428 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3429 }
3431 if (options->prefix &&
3432 strncmp(concatpath, options->prefix, options->prefix_length))
3433 return;
3435 one = alloc_filespec(concatpath);
3436 two = alloc_filespec(concatpath);
3437 fill_filespec(one, old_sha1, old_mode);
3438 fill_filespec(two, new_sha1, new_mode);
3440 diff_queue(&diff_queued_diff, one, two);
3441 DIFF_OPT_SET(options, HAS_CHANGES);
3442 }
3444 void diff_unmerge(struct diff_options *options,
3445 const char *path,
3446 unsigned mode, const unsigned char *sha1)
3447 {
3448 struct diff_filespec *one, *two;
3450 if (options->prefix &&
3451 strncmp(path, options->prefix, options->prefix_length))
3452 return;
3454 one = alloc_filespec(path);
3455 two = alloc_filespec(path);
3456 fill_filespec(one, sha1, mode);
3457 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3458 }
3460 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
3461 size_t *outsize)
3462 {
3463 struct diff_tempfile temp;
3464 const char *argv[3];
3465 const char **arg = argv;
3466 struct child_process child;
3467 struct strbuf buf = STRBUF_INIT;
3469 prepare_temp_file(spec->path, &temp, spec);
3470 *arg++ = pgm;
3471 *arg++ = temp.name;
3472 *arg = NULL;
3474 memset(&child, 0, sizeof(child));
3475 child.argv = argv;
3476 child.out = -1;
3477 if (start_command(&child) != 0 ||
3478 strbuf_read(&buf, child.out, 0) < 0 ||
3479 finish_command(&child) != 0) {
3480 if (temp.name == temp.tmp_path)
3481 unlink(temp.name);
3482 error("error running textconv command '%s'", pgm);
3483 return NULL;
3484 }
3485 if (temp.name == temp.tmp_path)
3486 unlink(temp.name);
3488 return strbuf_detach(&buf, outsize);
3489 }