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"
15#include "sigchain.h"
16#include "submodule.h"
17#include "ll-merge.h"
18#ifdef NO_FAST_WORKING_DIRECTORY
20#define FAST_WORKING_DIRECTORY 0
21#else
22#define FAST_WORKING_DIRECTORY 1
23#endif
24static int diff_detect_rename_default;
26static int diff_rename_limit_default = 400;
27static int diff_suppress_blank_empty;
28int diff_use_color_default = -1;
29static const char *diff_word_regex_cfg;
30static const char *external_diff_cmd_cfg;
31int diff_auto_refresh_index = 1;
32static int diff_mnemonic_prefix;
33static int diff_no_prefix;
34static int diff_dirstat_permille_default = 30;
35static struct diff_options default_diff_options;
36static char diff_colors[][COLOR_MAXLEN] = {
38 GIT_COLOR_RESET,
39 GIT_COLOR_NORMAL, /* PLAIN */
40 GIT_COLOR_BOLD, /* METAINFO */
41 GIT_COLOR_CYAN, /* FRAGINFO */
42 GIT_COLOR_RED, /* OLD */
43 GIT_COLOR_GREEN, /* NEW */
44 GIT_COLOR_YELLOW, /* COMMIT */
45 GIT_COLOR_BG_RED, /* WHITESPACE */
46 GIT_COLOR_NORMAL, /* FUNCINFO */
47};
48static int parse_diff_color_slot(const char *var, int ofs)
50{
51 if (!strcasecmp(var+ofs, "plain"))
52 return DIFF_PLAIN;
53 if (!strcasecmp(var+ofs, "meta"))
54 return DIFF_METAINFO;
55 if (!strcasecmp(var+ofs, "frag"))
56 return DIFF_FRAGINFO;
57 if (!strcasecmp(var+ofs, "old"))
58 return DIFF_FILE_OLD;
59 if (!strcasecmp(var+ofs, "new"))
60 return DIFF_FILE_NEW;
61 if (!strcasecmp(var+ofs, "commit"))
62 return DIFF_COMMIT;
63 if (!strcasecmp(var+ofs, "whitespace"))
64 return DIFF_WHITESPACE;
65 if (!strcasecmp(var+ofs, "func"))
66 return DIFF_FUNCINFO;
67 return -1;
68}
69static int parse_dirstat_params(struct diff_options *options, const char *params,
71 struct strbuf *errmsg)
72{
73 const char *p = params;
74 int p_len, ret = 0;
75 while (*p) {
77 p_len = strchrnul(p, ',') - p;
78 if (!memcmp(p, "changes", p_len)) {
79 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
80 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
81 } else if (!memcmp(p, "lines", p_len)) {
82 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
83 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
84 } else if (!memcmp(p, "files", p_len)) {
85 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
86 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
87 } else if (!memcmp(p, "noncumulative", p_len)) {
88 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
89 } else if (!memcmp(p, "cumulative", p_len)) {
90 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
91 } else if (isdigit(*p)) {
92 char *end;
93 int permille = strtoul(p, &end, 10) * 10;
94 if (*end == '.' && isdigit(*++end)) {
95 /* only use first digit */
96 permille += *end - '0';
97 /* .. and ignore any further digits */
98 while (isdigit(*++end))
99 ; /* nothing */
100 }
101 if (end - p == p_len)
102 options->dirstat_permille = permille;
103 else {
104 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%.*s'\n"),
105 p_len, p);
106 ret++;
107 }
108 } else {
109 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%.*s'\n"),
110 p_len, p);
111 ret++;
112 }
113 p += p_len;
115 if (*p)
117 p++; /* more parameters, swallow separator */
118 }
119 return ret;
120}
121static int git_config_rename(const char *var, const char *value)
123{
124 if (!value)
125 return DIFF_DETECT_RENAME;
126 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
127 return DIFF_DETECT_COPY;
128 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
129}
130/*
132 * These are to give UI layer defaults.
133 * The core-level commands such as git-diff-files should
134 * never be affected by the setting of diff.renames
135 * the user happens to have in the configuration file.
136 */
137int git_diff_ui_config(const char *var, const char *value, void *cb)
138{
139 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
140 diff_use_color_default = git_config_colorbool(var, value);
141 return 0;
142 }
143 if (!strcmp(var, "diff.renames")) {
144 diff_detect_rename_default = git_config_rename(var, value);
145 return 0;
146 }
147 if (!strcmp(var, "diff.autorefreshindex")) {
148 diff_auto_refresh_index = git_config_bool(var, value);
149 return 0;
150 }
151 if (!strcmp(var, "diff.mnemonicprefix")) {
152 diff_mnemonic_prefix = git_config_bool(var, value);
153 return 0;
154 }
155 if (!strcmp(var, "diff.noprefix")) {
156 diff_no_prefix = git_config_bool(var, value);
157 return 0;
158 }
159 if (!strcmp(var, "diff.external"))
160 return git_config_string(&external_diff_cmd_cfg, var, value);
161 if (!strcmp(var, "diff.wordregex"))
162 return git_config_string(&diff_word_regex_cfg, var, value);
163 if (!strcmp(var, "diff.ignoresubmodules"))
165 handle_ignore_submodules_arg(&default_diff_options, value);
166 if (git_color_config(var, value, cb) < 0)
168 return -1;
169 return git_diff_basic_config(var, value, cb);
171}
172int git_diff_basic_config(const char *var, const char *value, void *cb)
174{
175 if (!strcmp(var, "diff.renamelimit")) {
176 diff_rename_limit_default = git_config_int(var, value);
177 return 0;
178 }
179 switch (userdiff_config(var, value)) {
181 case 0: break;
182 case -1: return -1;
183 default: return 0;
184 }
185 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
187 int slot = parse_diff_color_slot(var, 11);
188 if (slot < 0)
189 return 0;
190 if (!value)
191 return config_error_nonbool(var);
192 color_parse(value, var, diff_colors[slot]);
193 return 0;
194 }
195 /* like GNU diff's --suppress-blank-empty option */
197 if (!strcmp(var, "diff.suppressblankempty") ||
198 /* for backwards compatibility */
199 !strcmp(var, "diff.suppress-blank-empty")) {
200 diff_suppress_blank_empty = git_config_bool(var, value);
201 return 0;
202 }
203 if (!strcmp(var, "diff.dirstat")) {
205 struct strbuf errmsg = STRBUF_INIT;
206 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
207 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
208 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
209 errmsg.buf);
210 strbuf_release(&errmsg);
211 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
212 return 0;
213 }
214 if (!prefixcmp(var, "submodule."))
216 return parse_submodule_config_option(var, value);
217 return git_default_config(var, value, cb);
219}
220static char *quote_two(const char *one, const char *two)
222{
223 int need_one = quote_c_style(one, NULL, NULL, 1);
224 int need_two = quote_c_style(two, NULL, NULL, 1);
225 struct strbuf res = STRBUF_INIT;
226 if (need_one + need_two) {
228 strbuf_addch(&res, '"');
229 quote_c_style(one, &res, NULL, 1);
230 quote_c_style(two, &res, NULL, 1);
231 strbuf_addch(&res, '"');
232 } else {
233 strbuf_addstr(&res, one);
234 strbuf_addstr(&res, two);
235 }
236 return strbuf_detach(&res, NULL);
237}
238static const char *external_diff(void)
240{
241 static const char *external_diff_cmd = NULL;
242 static int done_preparing = 0;
243 if (done_preparing)
245 return external_diff_cmd;
246 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
247 if (!external_diff_cmd)
248 external_diff_cmd = external_diff_cmd_cfg;
249 done_preparing = 1;
250 return external_diff_cmd;
251}
252static struct diff_tempfile {
254 const char *name; /* filename external diff should read from */
255 char hex[41];
256 char mode[10];
257 char tmp_path[PATH_MAX];
258} diff_temp[2];
259typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
261struct emit_callback {
263 int color_diff;
264 unsigned ws_rule;
265 int blank_at_eof_in_preimage;
266 int blank_at_eof_in_postimage;
267 int lno_in_preimage;
268 int lno_in_postimage;
269 sane_truncate_fn truncate;
270 const char **label_path;
271 struct diff_words_data *diff_words;
272 struct diff_options *opt;
273 int *found_changesp;
274 struct strbuf *header;
275};
276static int count_lines(const char *data, int size)
278{
279 int count, ch, completely_empty = 1, nl_just_seen = 0;
280 count = 0;
281 while (0 < size--) {
282 ch = *data++;
283 if (ch == '\n') {
284 count++;
285 nl_just_seen = 1;
286 completely_empty = 0;
287 }
288 else {
289 nl_just_seen = 0;
290 completely_empty = 0;
291 }
292 }
293 if (completely_empty)
294 return 0;
295 if (!nl_just_seen)
296 count++; /* no trailing newline */
297 return count;
298}
299static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
301{
302 if (!DIFF_FILE_VALID(one)) {
303 mf->ptr = (char *)""; /* does not matter */
304 mf->size = 0;
305 return 0;
306 }
307 else if (diff_populate_filespec(one, 0))
308 return -1;
309 mf->ptr = one->data;
311 mf->size = one->size;
312 return 0;
313}
314/* like fill_mmfile, but only for size, so we can avoid retrieving blob */
316static unsigned long diff_filespec_size(struct diff_filespec *one)
317{
318 if (!DIFF_FILE_VALID(one))
319 return 0;
320 diff_populate_filespec(one, 1);
321 return one->size;
322}
323static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
325{
326 char *ptr = mf->ptr;
327 long size = mf->size;
328 int cnt = 0;
329 if (!size)
331 return cnt;
332 ptr += size - 1; /* pointing at the very end */
333 if (*ptr != '\n')
334 ; /* incomplete line */
335 else
336 ptr--; /* skip the last LF */
337 while (mf->ptr < ptr) {
338 char *prev_eol;
339 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
340 if (*prev_eol == '\n')
341 break;
342 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
343 break;
344 cnt++;
345 ptr = prev_eol - 1;
346 }
347 return cnt;
348}
349static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
351 struct emit_callback *ecbdata)
352{
353 int l1, l2, at;
354 unsigned ws_rule = ecbdata->ws_rule;
355 l1 = count_trailing_blank(mf1, ws_rule);
356 l2 = count_trailing_blank(mf2, ws_rule);
357 if (l2 <= l1) {
358 ecbdata->blank_at_eof_in_preimage = 0;
359 ecbdata->blank_at_eof_in_postimage = 0;
360 return;
361 }
362 at = count_lines(mf1->ptr, mf1->size);
363 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
364 at = count_lines(mf2->ptr, mf2->size);
366 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
367}
368static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
370 int first, const char *line, int len)
371{
372 int has_trailing_newline, has_trailing_carriage_return;
373 int nofirst;
374 FILE *file = o->file;
375 if (o->output_prefix) {
377 struct strbuf *msg = NULL;
378 msg = o->output_prefix(o, o->output_prefix_data);
379 assert(msg);
380 fwrite(msg->buf, msg->len, 1, file);
381 }
382 if (len == 0) {
384 has_trailing_newline = (first == '\n');
385 has_trailing_carriage_return = (!has_trailing_newline &&
386 (first == '\r'));
387 nofirst = has_trailing_newline || has_trailing_carriage_return;
388 } else {
389 has_trailing_newline = (len > 0 && line[len-1] == '\n');
390 if (has_trailing_newline)
391 len--;
392 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
393 if (has_trailing_carriage_return)
394 len--;
395 nofirst = 0;
396 }
397 if (len || !nofirst) {
399 fputs(set, file);
400 if (!nofirst)
401 fputc(first, file);
402 fwrite(line, len, 1, file);
403 fputs(reset, file);
404 }
405 if (has_trailing_carriage_return)
406 fputc('\r', file);
407 if (has_trailing_newline)
408 fputc('\n', file);
409}
410static void emit_line(struct diff_options *o, const char *set, const char *reset,
412 const char *line, int len)
413{
414 emit_line_0(o, set, reset, line[0], line+1, len-1);
415}
416static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
418{
419 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
420 ecbdata->blank_at_eof_in_preimage &&
421 ecbdata->blank_at_eof_in_postimage &&
422 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
423 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
424 return 0;
425 return ws_blank_line(line, len, ecbdata->ws_rule);
426}
427static void emit_add_line(const char *reset,
429 struct emit_callback *ecbdata,
430 const char *line, int len)
431{
432 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
433 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
434 if (!*ws)
436 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
437 else if (new_blank_line_at_eof(ecbdata, line, len))
438 /* Blank line at EOF - paint '+' as well */
439 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
440 else {
441 /* Emit just the prefix, then the rest. */
442 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
443 ws_check_emit(line, len, ecbdata->ws_rule,
444 ecbdata->opt->file, set, reset, ws);
445 }
446}
447static void emit_hunk_header(struct emit_callback *ecbdata,
449 const char *line, int len)
450{
451 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
452 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
453 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
454 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
455 static const char atat[2] = { '@', '@' };
456 const char *cp, *ep;
457 struct strbuf msgbuf = STRBUF_INIT;
458 int org_len = len;
459 int i = 1;
460 /*
462 * As a hunk header must begin with "@@ -<old>, +<new> @@",
463 * it always is at least 10 bytes long.
464 */
465 if (len < 10 ||
466 memcmp(line, atat, 2) ||
467 !(ep = memmem(line + 2, len - 2, atat, 2))) {
468 emit_line(ecbdata->opt, plain, reset, line, len);
469 return;
470 }
471 ep += 2; /* skip over @@ */
472 /* The hunk header in fraginfo color */
474 strbuf_add(&msgbuf, frag, strlen(frag));
475 strbuf_add(&msgbuf, line, ep - line);
476 strbuf_add(&msgbuf, reset, strlen(reset));
477 /*
479 * trailing "\r\n"
480 */
481 for ( ; i < 3; i++)
482 if (line[len - i] == '\r' || line[len - i] == '\n')
483 len--;
484 /* blank before the func header */
486 for (cp = ep; ep - line < len; ep++)
487 if (*ep != ' ' && *ep != '\t')
488 break;
489 if (ep != cp) {
490 strbuf_add(&msgbuf, plain, strlen(plain));
491 strbuf_add(&msgbuf, cp, ep - cp);
492 strbuf_add(&msgbuf, reset, strlen(reset));
493 }
494 if (ep < line + len) {
496 strbuf_add(&msgbuf, func, strlen(func));
497 strbuf_add(&msgbuf, ep, line + len - ep);
498 strbuf_add(&msgbuf, reset, strlen(reset));
499 }
500 strbuf_add(&msgbuf, line + len, org_len - len);
502 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
503 strbuf_release(&msgbuf);
504}
505static struct diff_tempfile *claim_diff_tempfile(void) {
507 int i;
508 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
509 if (!diff_temp[i].name)
510 return diff_temp + i;
511 die("BUG: diff is failing to clean up its tempfiles");
512}
513static int remove_tempfile_installed;
515static void remove_tempfile(void)
517{
518 int i;
519 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
520 if (diff_temp[i].name == diff_temp[i].tmp_path)
521 unlink_or_warn(diff_temp[i].name);
522 diff_temp[i].name = NULL;
523 }
524}
525static void remove_tempfile_on_signal(int signo)
527{
528 remove_tempfile();
529 sigchain_pop(signo);
530 raise(signo);
531}
532static void print_line_count(FILE *file, int count)
534{
535 switch (count) {
536 case 0:
537 fprintf(file, "0,0");
538 break;
539 case 1:
540 fprintf(file, "1");
541 break;
542 default:
543 fprintf(file, "1,%d", count);
544 break;
545 }
546}
547static void emit_rewrite_lines(struct emit_callback *ecb,
549 int prefix, const char *data, int size)
550{
551 const char *endp = NULL;
552 static const char *nneof = " No newline at end of file\n";
553 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
554 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
555 while (0 < size) {
557 int len;
558 endp = memchr(data, '\n', size);
560 len = endp ? (endp - data + 1) : size;
561 if (prefix != '+') {
562 ecb->lno_in_preimage++;
563 emit_line_0(ecb->opt, old, reset, '-',
564 data, len);
565 } else {
566 ecb->lno_in_postimage++;
567 emit_add_line(reset, ecb, data, len);
568 }
569 size -= len;
570 data += len;
571 }
572 if (!endp) {
573 const char *plain = diff_get_color(ecb->color_diff,
574 DIFF_PLAIN);
575 emit_line_0(ecb->opt, plain, reset, '\\',
576 nneof, strlen(nneof));
577 }
578}
579static void emit_rewrite_diff(const char *name_a,
581 const char *name_b,
582 struct diff_filespec *one,
583 struct diff_filespec *two,
584 struct userdiff_driver *textconv_one,
585 struct userdiff_driver *textconv_two,
586 struct diff_options *o)
587{
588 int lc_a, lc_b;
589 const char *name_a_tab, *name_b_tab;
590 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
591 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
592 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
593 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
594 const char *a_prefix, *b_prefix;
595 char *data_one, *data_two;
596 size_t size_one, size_two;
597 struct emit_callback ecbdata;
598 char *line_prefix = "";
599 struct strbuf *msgbuf;
600 if (o && o->output_prefix) {
602 msgbuf = o->output_prefix(o, o->output_prefix_data);
603 line_prefix = msgbuf->buf;
604 }
605 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
607 a_prefix = o->b_prefix;
608 b_prefix = o->a_prefix;
609 } else {
610 a_prefix = o->a_prefix;
611 b_prefix = o->b_prefix;
612 }
613 name_a += (*name_a == '/');
615 name_b += (*name_b == '/');
616 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
617 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
618 strbuf_reset(&a_name);
620 strbuf_reset(&b_name);
621 quote_two_c_style(&a_name, a_prefix, name_a, 0);
622 quote_two_c_style(&b_name, b_prefix, name_b, 0);
623 size_one = fill_textconv(textconv_one, one, &data_one);
625 size_two = fill_textconv(textconv_two, two, &data_two);
626 memset(&ecbdata, 0, sizeof(ecbdata));
628 ecbdata.color_diff = want_color(o->use_color);
629 ecbdata.found_changesp = &o->found_changes;
630 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
631 ecbdata.opt = o;
632 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
633 mmfile_t mf1, mf2;
634 mf1.ptr = (char *)data_one;
635 mf2.ptr = (char *)data_two;
636 mf1.size = size_one;
637 mf2.size = size_two;
638 check_blank_at_eof(&mf1, &mf2, &ecbdata);
639 }
640 ecbdata.lno_in_preimage = 1;
641 ecbdata.lno_in_postimage = 1;
642 lc_a = count_lines(data_one, size_one);
644 lc_b = count_lines(data_two, size_two);
645 fprintf(o->file,
646 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
647 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
648 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
649 line_prefix, fraginfo);
650 if (!o->irreversible_delete)
651 print_line_count(o->file, lc_a);
652 else
653 fprintf(o->file, "?,?");
654 fprintf(o->file, " +");
655 print_line_count(o->file, lc_b);
656 fprintf(o->file, " @@%s\n", reset);
657 if (lc_a && !o->irreversible_delete)
658 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
659 if (lc_b)
660 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
661 if (textconv_one)
662 free((char *)data_one);
663 if (textconv_two)
664 free((char *)data_two);
665}
666struct diff_words_buffer {
668 mmfile_t text;
669 long alloc;
670 struct diff_words_orig {
671 const char *begin, *end;
672 } *orig;
673 int orig_nr, orig_alloc;
674};
675static void diff_words_append(char *line, unsigned long len,
677 struct diff_words_buffer *buffer)
678{
679 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
680 line++;
681 len--;
682 memcpy(buffer->text.ptr + buffer->text.size, line, len);
683 buffer->text.size += len;
684 buffer->text.ptr[buffer->text.size] = '\0';
685}
686struct diff_words_style_elem {
688 const char *prefix;
689 const char *suffix;
690 const char *color; /* NULL; filled in by the setup code if
691 * color is enabled */
692};
693struct diff_words_style {
695 enum diff_words_type type;
696 struct diff_words_style_elem new, old, ctx;
697 const char *newline;
698};
699static struct diff_words_style diff_words_styles[] = {
701 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
702 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
703 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
704};
705struct diff_words_data {
707 struct diff_words_buffer minus, plus;
708 const char *current_plus;
709 int last_minus;
710 struct diff_options *opt;
711 regex_t *word_regex;
712 enum diff_words_type type;
713 struct diff_words_style *style;
714};
715static int fn_out_diff_words_write_helper(FILE *fp,
717 struct diff_words_style_elem *st_el,
718 const char *newline,
719 size_t count, const char *buf,
720 const char *line_prefix)
721{
722 int print = 0;
723 while (count) {
725 char *p = memchr(buf, '\n', count);
726 if (print)
727 fputs(line_prefix, fp);
728 if (p != buf) {
729 if (st_el->color && fputs(st_el->color, fp) < 0)
730 return -1;
731 if (fputs(st_el->prefix, fp) < 0 ||
732 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
733 fputs(st_el->suffix, fp) < 0)
734 return -1;
735 if (st_el->color && *st_el->color
736 && fputs(GIT_COLOR_RESET, fp) < 0)
737 return -1;
738 }
739 if (!p)
740 return 0;
741 if (fputs(newline, fp) < 0)
742 return -1;
743 count -= p + 1 - buf;
744 buf = p + 1;
745 print = 1;
746 }
747 return 0;
748}
749/*
751 * '--color-words' algorithm can be described as:
752 *
753 * 1. collect a the minus/plus lines of a diff hunk, divided into
754 * minus-lines and plus-lines;
755 *
756 * 2. break both minus-lines and plus-lines into words and
757 * place them into two mmfile_t with one word for each line;
758 *
759 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
760 *
761 * And for the common parts of the both file, we output the plus side text.
762 * diff_words->current_plus is used to trace the current position of the plus file
763 * which printed. diff_words->last_minus is used to trace the last minus word
764 * printed.
765 *
766 * For '--graph' to work with '--color-words', we need to output the graph prefix
767 * on each line of color words output. Generally, there are two conditions on
768 * which we should output the prefix.
769 *
770 * 1. diff_words->last_minus == 0 &&
771 * diff_words->current_plus == diff_words->plus.text.ptr
772 *
773 * that is: the plus text must start as a new line, and if there is no minus
774 * word printed, a graph prefix must be printed.
775 *
776 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
777 * *(diff_words->current_plus - 1) == '\n'
778 *
779 * that is: a graph prefix must be printed following a '\n'
780 */
781static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
782{
783 if ((diff_words->last_minus == 0 &&
784 diff_words->current_plus == diff_words->plus.text.ptr) ||
785 (diff_words->current_plus > diff_words->plus.text.ptr &&
786 *(diff_words->current_plus - 1) == '\n')) {
787 return 1;
788 } else {
789 return 0;
790 }
791}
792static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
794{
795 struct diff_words_data *diff_words = priv;
796 struct diff_words_style *style = diff_words->style;
797 int minus_first, minus_len, plus_first, plus_len;
798 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
799 struct diff_options *opt = diff_words->opt;
800 struct strbuf *msgbuf;
801 char *line_prefix = "";
802 if (line[0] != '@' || parse_hunk_header(line, len,
804 &minus_first, &minus_len, &plus_first, &plus_len))
805 return;
806 assert(opt);
808 if (opt->output_prefix) {
809 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
810 line_prefix = msgbuf->buf;
811 }
812 /* POSIX requires that first be decremented by one if len == 0... */
814 if (minus_len) {
815 minus_begin = diff_words->minus.orig[minus_first].begin;
816 minus_end =
817 diff_words->minus.orig[minus_first + minus_len - 1].end;
818 } else
819 minus_begin = minus_end =
820 diff_words->minus.orig[minus_first].end;
821 if (plus_len) {
823 plus_begin = diff_words->plus.orig[plus_first].begin;
824 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
825 } else
826 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
827 if (color_words_output_graph_prefix(diff_words)) {
829 fputs(line_prefix, diff_words->opt->file);
830 }
831 if (diff_words->current_plus != plus_begin) {
832 fn_out_diff_words_write_helper(diff_words->opt->file,
833 &style->ctx, style->newline,
834 plus_begin - diff_words->current_plus,
835 diff_words->current_plus, line_prefix);
836 if (*(plus_begin - 1) == '\n')
837 fputs(line_prefix, diff_words->opt->file);
838 }
839 if (minus_begin != minus_end) {
840 fn_out_diff_words_write_helper(diff_words->opt->file,
841 &style->old, style->newline,
842 minus_end - minus_begin, minus_begin,
843 line_prefix);
844 }
845 if (plus_begin != plus_end) {
846 fn_out_diff_words_write_helper(diff_words->opt->file,
847 &style->new, style->newline,
848 plus_end - plus_begin, plus_begin,
849 line_prefix);
850 }
851 diff_words->current_plus = plus_end;
853 diff_words->last_minus = minus_first;
854}
855/* This function starts looking at *begin, and returns 0 iff a word was found. */
857static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
858 int *begin, int *end)
859{
860 if (word_regex && *begin < buffer->size) {
861 regmatch_t match[1];
862 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
863 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
864 '\n', match[0].rm_eo - match[0].rm_so);
865 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
866 *begin += match[0].rm_so;
867 return *begin >= *end;
868 }
869 return -1;
870 }
871 /* find the next word */
873 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
874 (*begin)++;
875 if (*begin >= buffer->size)
876 return -1;
877 /* find the end of the word */
879 *end = *begin + 1;
880 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
881 (*end)++;
882 return 0;
884}
885/*
887 * This function splits the words in buffer->text, stores the list with
888 * newline separator into out, and saves the offsets of the original words
889 * in buffer->orig.
890 */
891static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
892 regex_t *word_regex)
893{
894 int i, j;
895 long alloc = 0;
896 out->size = 0;
898 out->ptr = NULL;
899 /* fake an empty "0th" word */
901 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
902 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
903 buffer->orig_nr = 1;
904 for (i = 0; i < buffer->text.size; i++) {
906 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
907 return;
908 /* store original boundaries */
910 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
911 buffer->orig_alloc);
912 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
913 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
914 buffer->orig_nr++;
915 /* store one word */
917 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
918 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
919 out->ptr[out->size + j - i] = '\n';
920 out->size += j - i + 1;
921 i = j - 1;
923 }
924}
925/* this executes the word diff on the accumulated buffers */
927static void diff_words_show(struct diff_words_data *diff_words)
928{
929 xpparam_t xpp;
930 xdemitconf_t xecfg;
931 mmfile_t minus, plus;
932 struct diff_words_style *style = diff_words->style;
933 struct diff_options *opt = diff_words->opt;
935 struct strbuf *msgbuf;
936 char *line_prefix = "";
937 assert(opt);
939 if (opt->output_prefix) {
940 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
941 line_prefix = msgbuf->buf;
942 }
943 /* special case: only removal */
945 if (!diff_words->plus.text.size) {
946 fputs(line_prefix, diff_words->opt->file);
947 fn_out_diff_words_write_helper(diff_words->opt->file,
948 &style->old, style->newline,
949 diff_words->minus.text.size,
950 diff_words->minus.text.ptr, line_prefix);
951 diff_words->minus.text.size = 0;
952 return;
953 }
954 diff_words->current_plus = diff_words->plus.text.ptr;
956 diff_words->last_minus = 0;
957 memset(&xpp, 0, sizeof(xpp));
959 memset(&xecfg, 0, sizeof(xecfg));
960 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
961 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
962 xpp.flags = 0;
963 /* as only the hunk header will be parsed, we need a 0-context */
964 xecfg.ctxlen = 0;
965 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
966 &xpp, &xecfg);
967 free(minus.ptr);
968 free(plus.ptr);
969 if (diff_words->current_plus != diff_words->plus.text.ptr +
970 diff_words->plus.text.size) {
971 if (color_words_output_graph_prefix(diff_words))
972 fputs(line_prefix, diff_words->opt->file);
973 fn_out_diff_words_write_helper(diff_words->opt->file,
974 &style->ctx, style->newline,
975 diff_words->plus.text.ptr + diff_words->plus.text.size
976 - diff_words->current_plus, diff_words->current_plus,
977 line_prefix);
978 }
979 diff_words->minus.text.size = diff_words->plus.text.size = 0;
980}
981/* In "color-words" mode, show word-diff of words accumulated in the buffer */
983static void diff_words_flush(struct emit_callback *ecbdata)
984{
985 if (ecbdata->diff_words->minus.text.size ||
986 ecbdata->diff_words->plus.text.size)
987 diff_words_show(ecbdata->diff_words);
988}
989static void free_diff_words_data(struct emit_callback *ecbdata)
991{
992 if (ecbdata->diff_words) {
993 diff_words_flush(ecbdata);
994 free (ecbdata->diff_words->minus.text.ptr);
995 free (ecbdata->diff_words->minus.orig);
996 free (ecbdata->diff_words->plus.text.ptr);
997 free (ecbdata->diff_words->plus.orig);
998 if (ecbdata->diff_words->word_regex) {
999 regfree(ecbdata->diff_words->word_regex);
1000 free(ecbdata->diff_words->word_regex);
1001 }
1002 free(ecbdata->diff_words);
1003 ecbdata->diff_words = NULL;
1004 }
1005}
1006const char *diff_get_color(int diff_use_color, enum color_diff ix)
1008{
1009 if (want_color(diff_use_color))
1010 return diff_colors[ix];
1011 return "";
1012}
1013static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1015{
1016 const char *cp;
1017 unsigned long allot;
1018 size_t l = len;
1019 if (ecb->truncate)
1021 return ecb->truncate(line, len);
1022 cp = line;
1023 allot = l;
1024 while (0 < l) {
1025 (void) utf8_width(&cp, &l);
1026 if (!cp)
1027 break; /* truncated in the middle? */
1028 }
1029 return allot - l;
1030}
1031static void find_lno(const char *line, struct emit_callback *ecbdata)
1033{
1034 const char *p;
1035 ecbdata->lno_in_preimage = 0;
1036 ecbdata->lno_in_postimage = 0;
1037 p = strchr(line, '-');
1038 if (!p)
1039 return; /* cannot happen */
1040 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1041 p = strchr(p, '+');
1042 if (!p)
1043 return; /* cannot happen */
1044 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1045}
1046static void fn_out_consume(void *priv, char *line, unsigned long len)
1048{
1049 struct emit_callback *ecbdata = priv;
1050 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1051 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1052 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1053 struct diff_options *o = ecbdata->opt;
1054 char *line_prefix = "";
1055 struct strbuf *msgbuf;
1056 if (o && o->output_prefix) {
1058 msgbuf = o->output_prefix(o, o->output_prefix_data);
1059 line_prefix = msgbuf->buf;
1060 }
1061 if (ecbdata->header) {
1063 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1064 strbuf_reset(ecbdata->header);
1065 ecbdata->header = NULL;
1066 }
1067 *(ecbdata->found_changesp) = 1;
1068 if (ecbdata->label_path[0]) {
1070 const char *name_a_tab, *name_b_tab;
1071 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1073 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1074 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1076 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1077 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1078 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1079 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1080 }
1081 if (diff_suppress_blank_empty
1083 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1084 line[0] = '\n';
1085 len = 1;
1086 }
1087 if (line[0] == '@') {
1089 if (ecbdata->diff_words)
1090 diff_words_flush(ecbdata);
1091 len = sane_truncate_line(ecbdata, line, len);
1092 find_lno(line, ecbdata);
1093 emit_hunk_header(ecbdata, line, len);
1094 if (line[len-1] != '\n')
1095 putc('\n', ecbdata->opt->file);
1096 return;
1097 }
1098 if (len < 1) {
1100 emit_line(ecbdata->opt, reset, reset, line, len);
1101 if (ecbdata->diff_words
1102 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1103 fputs("~\n", ecbdata->opt->file);
1104 return;
1105 }
1106 if (ecbdata->diff_words) {
1108 if (line[0] == '-') {
1109 diff_words_append(line, len,
1110 &ecbdata->diff_words->minus);
1111 return;
1112 } else if (line[0] == '+') {
1113 diff_words_append(line, len,
1114 &ecbdata->diff_words->plus);
1115 return;
1116 } else if (!prefixcmp(line, "\\ ")) {
1117 /*
1118 * Eat the "no newline at eof" marker as if we
1119 * saw a "+" or "-" line with nothing on it,
1120 * and return without diff_words_flush() to
1121 * defer processing. If this is the end of
1122 * preimage, more "+" lines may come after it.
1123 */
1124 return;
1125 }
1126 diff_words_flush(ecbdata);
1127 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1128 emit_line(ecbdata->opt, plain, reset, line, len);
1129 fputs("~\n", ecbdata->opt->file);
1130 } else {
1131 /*
1132 * Skip the prefix character, if any. With
1133 * diff_suppress_blank_empty, there may be
1134 * none.
1135 */
1136 if (line[0] != '\n') {
1137 line++;
1138 len--;
1139 }
1140 emit_line(ecbdata->opt, plain, reset, line, len);
1141 }
1142 return;
1143 }
1144 if (line[0] != '+') {
1146 const char *color =
1147 diff_get_color(ecbdata->color_diff,
1148 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1149 ecbdata->lno_in_preimage++;
1150 if (line[0] == ' ')
1151 ecbdata->lno_in_postimage++;
1152 emit_line(ecbdata->opt, color, reset, line, len);
1153 } else {
1154 ecbdata->lno_in_postimage++;
1155 emit_add_line(reset, ecbdata, line + 1, len - 1);
1156 }
1157}
1158static char *pprint_rename(const char *a, const char *b)
1160{
1161 const char *old = a;
1162 const char *new = b;
1163 struct strbuf name = STRBUF_INIT;
1164 int pfx_length, sfx_length;
1165 int len_a = strlen(a);
1166 int len_b = strlen(b);
1167 int a_midlen, b_midlen;
1168 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1169 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1170 if (qlen_a || qlen_b) {
1172 quote_c_style(a, &name, NULL, 0);
1173 strbuf_addstr(&name, " => ");
1174 quote_c_style(b, &name, NULL, 0);
1175 return strbuf_detach(&name, NULL);
1176 }
1177 /* Find common prefix */
1179 pfx_length = 0;
1180 while (*old && *new && *old == *new) {
1181 if (*old == '/')
1182 pfx_length = old - a + 1;
1183 old++;
1184 new++;
1185 }
1186 /* Find common suffix */
1188 old = a + len_a;
1189 new = b + len_b;
1190 sfx_length = 0;
1191 while (a <= old && b <= new && *old == *new) {
1192 if (*old == '/')
1193 sfx_length = len_a - (old - a);
1194 old--;
1195 new--;
1196 }
1197 /*
1199 * pfx{mid-a => mid-b}sfx
1200 * {pfx-a => pfx-b}sfx
1201 * pfx{sfx-a => sfx-b}
1202 * name-a => name-b
1203 */
1204 a_midlen = len_a - pfx_length - sfx_length;
1205 b_midlen = len_b - pfx_length - sfx_length;
1206 if (a_midlen < 0)
1207 a_midlen = 0;
1208 if (b_midlen < 0)
1209 b_midlen = 0;
1210 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1212 if (pfx_length + sfx_length) {
1213 strbuf_add(&name, a, pfx_length);
1214 strbuf_addch(&name, '{');
1215 }
1216 strbuf_add(&name, a + pfx_length, a_midlen);
1217 strbuf_addstr(&name, " => ");
1218 strbuf_add(&name, b + pfx_length, b_midlen);
1219 if (pfx_length + sfx_length) {
1220 strbuf_addch(&name, '}');
1221 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1222 }
1223 return strbuf_detach(&name, NULL);
1224}
1225struct diffstat_t {
1227 int nr;
1228 int alloc;
1229 struct diffstat_file {
1230 char *from_name;
1231 char *name;
1232 char *print_name;
1233 unsigned is_unmerged:1;
1234 unsigned is_binary:1;
1235 unsigned is_renamed:1;
1236 uintmax_t added, deleted;
1237 } **files;
1238};
1239static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1241 const char *name_a,
1242 const char *name_b)
1243{
1244 struct diffstat_file *x;
1245 x = xcalloc(sizeof (*x), 1);
1246 if (diffstat->nr == diffstat->alloc) {
1247 diffstat->alloc = alloc_nr(diffstat->alloc);
1248 diffstat->files = xrealloc(diffstat->files,
1249 diffstat->alloc * sizeof(x));
1250 }
1251 diffstat->files[diffstat->nr++] = x;
1252 if (name_b) {
1253 x->from_name = xstrdup(name_a);
1254 x->name = xstrdup(name_b);
1255 x->is_renamed = 1;
1256 }
1257 else {
1258 x->from_name = NULL;
1259 x->name = xstrdup(name_a);
1260 }
1261 return x;
1262}
1263static void diffstat_consume(void *priv, char *line, unsigned long len)
1265{
1266 struct diffstat_t *diffstat = priv;
1267 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1268 if (line[0] == '+')
1270 x->added++;
1271 else if (line[0] == '-')
1272 x->deleted++;
1273}
1274const char mime_boundary_leader[] = "------------";
1276static int scale_linear(int it, int width, int max_change)
1278{
1279 if (!it)
1280 return 0;
1281 /*
1282 * make sure that at least one '-' or '+' is printed if
1283 * there is any change to this path. The easiest way is to
1284 * scale linearly as if the alloted width is one column shorter
1285 * than it is, and then add 1 to the result.
1286 */
1287 return 1 + (it * (width - 1) / max_change);
1288}
1289static void show_name(FILE *file,
1291 const char *prefix, const char *name, int len)
1292{
1293 fprintf(file, " %s%-*s |", prefix, len, name);
1294}
1295static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1297{
1298 if (cnt <= 0)
1299 return;
1300 fprintf(file, "%s", set);
1301 while (cnt--)
1302 putc(ch, file);
1303 fprintf(file, "%s", reset);
1304}
1305static void fill_print_name(struct diffstat_file *file)
1307{
1308 char *pname;
1309 if (file->print_name)
1311 return;
1312 if (!file->is_renamed) {
1314 struct strbuf buf = STRBUF_INIT;
1315 if (quote_c_style(file->name, &buf, NULL, 0)) {
1316 pname = strbuf_detach(&buf, NULL);
1317 } else {
1318 pname = file->name;
1319 strbuf_release(&buf);
1320 }
1321 } else {
1322 pname = pprint_rename(file->from_name, file->name);
1323 }
1324 file->print_name = pname;
1325}
1326int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1328{
1329 struct strbuf sb = STRBUF_INIT;
1330 int ret;
1331 if (!files) {
1333 assert(insertions == 0 && deletions == 0);
1334 return fputs(_(" 0 files changed\n"), fp);
1335 }
1336 strbuf_addf(&sb,
1338 Q_(" %d file changed", " %d files changed", files),
1339 files);
1340 /*
1342 * For binary diff, the caller may want to print "x files
1343 * changed" with insertions == 0 && deletions == 0.
1344 *
1345 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1346 * is probably less confusing (i.e skip over "2 files changed
1347 * but nothing about added/removed lines? Is this a bug in Git?").
1348 */
1349 if (insertions || deletions == 0) {
1350 /*
1351 * TRANSLATORS: "+" in (+) is a line addition marker;
1352 * do not translate it.
1353 */
1354 strbuf_addf(&sb,
1355 Q_(", %d insertion(+)", ", %d insertions(+)",
1356 insertions),
1357 insertions);
1358 }
1359 if (deletions || insertions == 0) {
1361 /*
1362 * TRANSLATORS: "-" in (-) is a line removal marker;
1363 * do not translate it.
1364 */
1365 strbuf_addf(&sb,
1366 Q_(", %d deletion(-)", ", %d deletions(-)",
1367 deletions),
1368 deletions);
1369 }
1370 strbuf_addch(&sb, '\n');
1371 ret = fputs(sb.buf, fp);
1372 strbuf_release(&sb);
1373 return ret;
1374}
1375static void show_stats(struct diffstat_t *data, struct diff_options *options)
1377{
1378 int i, len, add, del, adds = 0, dels = 0;
1379 uintmax_t max_change = 0, max_len = 0;
1380 int total_files = data->nr;
1381 int width, name_width, count;
1382 const char *reset, *add_c, *del_c;
1383 const char *line_prefix = "";
1384 int extra_shown = 0;
1385 struct strbuf *msg = NULL;
1386 if (data->nr == 0)
1388 return;
1389 if (options->output_prefix) {
1391 msg = options->output_prefix(options, options->output_prefix_data);
1392 line_prefix = msg->buf;
1393 }
1394 width = options->stat_width ? options->stat_width : 80;
1396 name_width = options->stat_name_width ? options->stat_name_width : 50;
1397 count = options->stat_count ? options->stat_count : data->nr;
1398 /* Sanity: give at least 5 columns to the graph,
1400 * but leave at least 10 columns for the name.
1401 */
1402 if (width < 25)
1403 width = 25;
1404 if (name_width < 10)
1405 name_width = 10;
1406 else if (width < name_width + 15)
1407 name_width = width - 15;
1408 /* Find the longest filename and max number of changes */
1410 reset = diff_get_color_opt(options, DIFF_RESET);
1411 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1412 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1413 for (i = 0; (i < count) && (i < data->nr); i++) {
1415 struct diffstat_file *file = data->files[i];
1416 uintmax_t change = file->added + file->deleted;
1417 if (!data->files[i]->is_renamed &&
1418 (change == 0)) {
1419 count++; /* not shown == room for one more */
1420 continue;
1421 }
1422 fill_print_name(file);
1423 len = strlen(file->print_name);
1424 if (max_len < len)
1425 max_len = len;
1426 if (file->is_binary || file->is_unmerged)
1428 continue;
1429 if (max_change < change)
1430 max_change = change;
1431 }
1432 count = i; /* min(count, data->nr) */
1433 /* Compute the width of the graph part;
1435 * 10 is for one blank at the beginning of the line plus
1436 * " | count " between the name and the graph.
1437 *
1438 * From here on, name_width is the width of the name area,
1439 * and width is the width of the graph area.
1440 */
1441 name_width = (name_width < max_len) ? name_width : max_len;
1442 if (width < (name_width + 10) + max_change)
1443 width = width - (name_width + 10);
1444 else
1445 width = max_change;
1446 for (i = 0; i < count; i++) {
1448 const char *prefix = "";
1449 char *name = data->files[i]->print_name;
1450 uintmax_t added = data->files[i]->added;
1451 uintmax_t deleted = data->files[i]->deleted;
1452 int name_len;
1453 if (!data->files[i]->is_renamed &&
1455 (added + deleted == 0)) {
1456 total_files--;
1457 continue;
1458 }
1459 /*
1460 * "scale" the filename
1461 */
1462 len = name_width;
1463 name_len = strlen(name);
1464 if (name_width < name_len) {
1465 char *slash;
1466 prefix = "...";
1467 len -= 3;
1468 name += name_len - len;
1469 slash = strchr(name, '/');
1470 if (slash)
1471 name = slash;
1472 }
1473 if (data->files[i]->is_binary) {
1475 fprintf(options->file, "%s", line_prefix);
1476 show_name(options->file, prefix, name, len);
1477 fprintf(options->file, " Bin ");
1478 fprintf(options->file, "%s%"PRIuMAX"%s",
1479 del_c, deleted, reset);
1480 fprintf(options->file, " -> ");
1481 fprintf(options->file, "%s%"PRIuMAX"%s",
1482 add_c, added, reset);
1483 fprintf(options->file, " bytes");
1484 fprintf(options->file, "\n");
1485 continue;
1486 }
1487 else if (data->files[i]->is_unmerged) {
1488 fprintf(options->file, "%s", line_prefix);
1489 show_name(options->file, prefix, name, len);
1490 fprintf(options->file, " Unmerged\n");
1491 continue;
1492 }
1493 /*
1495 * scale the add/delete
1496 */
1497 add = added;
1498 del = deleted;
1499 adds += add;
1500 dels += del;
1501 if (width <= max_change) {
1503 int total = add + del;
1504 total = scale_linear(add + del, width, max_change);
1506 if (total < 2 && add && del)
1507 /* width >= 2 due to the sanity check */
1508 total = 2;
1509 if (add < del) {
1510 add = scale_linear(add, width, max_change);
1511 del = total - add;
1512 } else {
1513 del = scale_linear(del, width, max_change);
1514 add = total - del;
1515 }
1516 }
1517 fprintf(options->file, "%s", line_prefix);
1518 show_name(options->file, prefix, name, len);
1519 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1520 added + deleted ? " " : "");
1521 show_graph(options->file, '+', add, add_c, reset);
1522 show_graph(options->file, '-', del, del_c, reset);
1523 fprintf(options->file, "\n");
1524 }
1525 for (i = count; i < data->nr; i++) {
1526 uintmax_t added = data->files[i]->added;
1527 uintmax_t deleted = data->files[i]->deleted;
1528 if (!data->files[i]->is_renamed &&
1529 (added + deleted == 0)) {
1530 total_files--;
1531 continue;
1532 }
1533 adds += added;
1534 dels += deleted;
1535 if (!extra_shown)
1536 fprintf(options->file, "%s ...\n", line_prefix);
1537 extra_shown = 1;
1538 }
1539 fprintf(options->file, "%s", line_prefix);
1540 print_stat_summary(options->file, total_files, adds, dels);
1541}
1542static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1544{
1545 int i, adds = 0, dels = 0, total_files = data->nr;
1546 if (data->nr == 0)
1548 return;
1549 for (i = 0; i < data->nr; i++) {
1551 if (!data->files[i]->is_binary &&
1552 !data->files[i]->is_unmerged) {
1553 int added = data->files[i]->added;
1554 int deleted= data->files[i]->deleted;
1555 if (!data->files[i]->is_renamed &&
1556 (added + deleted == 0)) {
1557 total_files--;
1558 } else {
1559 adds += added;
1560 dels += deleted;
1561 }
1562 }
1563 }
1564 if (options->output_prefix) {
1565 struct strbuf *msg = NULL;
1566 msg = options->output_prefix(options,
1567 options->output_prefix_data);
1568 fprintf(options->file, "%s", msg->buf);
1569 }
1570 print_stat_summary(options->file, total_files, adds, dels);
1571}
1572static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1574{
1575 int i;
1576 if (data->nr == 0)
1578 return;
1579 for (i = 0; i < data->nr; i++) {
1581 struct diffstat_file *file = data->files[i];
1582 if (options->output_prefix) {
1584 struct strbuf *msg = NULL;
1585 msg = options->output_prefix(options,
1586 options->output_prefix_data);
1587 fprintf(options->file, "%s", msg->buf);
1588 }
1589 if (file->is_binary)
1591 fprintf(options->file, "-\t-\t");
1592 else
1593 fprintf(options->file,
1594 "%"PRIuMAX"\t%"PRIuMAX"\t",
1595 file->added, file->deleted);
1596 if (options->line_termination) {
1597 fill_print_name(file);
1598 if (!file->is_renamed)
1599 write_name_quoted(file->name, options->file,
1600 options->line_termination);
1601 else {
1602 fputs(file->print_name, options->file);
1603 putc(options->line_termination, options->file);
1604 }
1605 } else {
1606 if (file->is_renamed) {
1607 putc('\0', options->file);
1608 write_name_quoted(file->from_name, options->file, '\0');
1609 }
1610 write_name_quoted(file->name, options->file, '\0');
1611 }
1612 }
1613}
1614struct dirstat_file {
1616 const char *name;
1617 unsigned long changed;
1618};
1619struct dirstat_dir {
1621 struct dirstat_file *files;
1622 int alloc, nr, permille, cumulative;
1623};
1624static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1626 unsigned long changed, const char *base, int baselen)
1627{
1628 unsigned long this_dir = 0;
1629 unsigned int sources = 0;
1630 const char *line_prefix = "";
1631 struct strbuf *msg = NULL;
1632 if (opt->output_prefix) {
1634 msg = opt->output_prefix(opt, opt->output_prefix_data);
1635 line_prefix = msg->buf;
1636 }
1637 while (dir->nr) {
1639 struct dirstat_file *f = dir->files;
1640 int namelen = strlen(f->name);
1641 unsigned long this;
1642 char *slash;
1643 if (namelen < baselen)
1645 break;
1646 if (memcmp(f->name, base, baselen))
1647 break;
1648 slash = strchr(f->name + baselen, '/');
1649 if (slash) {
1650 int newbaselen = slash + 1 - f->name;
1651 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1652 sources++;
1653 } else {
1654 this = f->changed;
1655 dir->files++;
1656 dir->nr--;
1657 sources += 2;
1658 }
1659 this_dir += this;
1660 }
1661 /*
1663 * We don't report dirstat's for
1664 * - the top level
1665 * - or cases where everything came from a single directory
1666 * under this directory (sources == 1).
1667 */
1668 if (baselen && sources != 1) {
1669 if (this_dir) {
1670 int permille = this_dir * 1000 / changed;
1671 if (permille >= dir->permille) {
1672 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1673 permille / 10, permille % 10, baselen, base);
1674 if (!dir->cumulative)
1675 return 0;
1676 }
1677 }
1678 }
1679 return this_dir;
1680}
1681static int dirstat_compare(const void *_a, const void *_b)
1683{
1684 const struct dirstat_file *a = _a;
1685 const struct dirstat_file *b = _b;
1686 return strcmp(a->name, b->name);
1687}
1688static void show_dirstat(struct diff_options *options)
1690{
1691 int i;
1692 unsigned long changed;
1693 struct dirstat_dir dir;
1694 struct diff_queue_struct *q = &diff_queued_diff;
1695 dir.files = NULL;
1697 dir.alloc = 0;
1698 dir.nr = 0;
1699 dir.permille = options->dirstat_permille;
1700 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1701 changed = 0;
1703 for (i = 0; i < q->nr; i++) {
1704 struct diff_filepair *p = q->queue[i];
1705 const char *name;
1706 unsigned long copied, added, damage;
1707 int content_changed;
1708 name = p->two->path ? p->two->path : p->one->path;
1710 if (p->one->sha1_valid && p->two->sha1_valid)
1712 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1713 else
1714 content_changed = 1;
1715 if (!content_changed) {
1717 /*
1718 * The SHA1 has not changed, so pre-/post-content is
1719 * identical. We can therefore skip looking at the
1720 * file contents altogether.
1721 */
1722 damage = 0;
1723 goto found_damage;
1724 }
1725 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1727 /*
1728 * In --dirstat-by-file mode, we don't really need to
1729 * look at the actual file contents at all.
1730 * The fact that the SHA1 changed is enough for us to
1731 * add this file to the list of results
1732 * (with each file contributing equal damage).
1733 */
1734 damage = 1;
1735 goto found_damage;
1736 }
1737 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1739 diff_populate_filespec(p->one, 0);
1740 diff_populate_filespec(p->two, 0);
1741 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1742 &copied, &added);
1743 diff_free_filespec_data(p->one);
1744 diff_free_filespec_data(p->two);
1745 } else if (DIFF_FILE_VALID(p->one)) {
1746 diff_populate_filespec(p->one, 1);
1747 copied = added = 0;
1748 diff_free_filespec_data(p->one);
1749 } else if (DIFF_FILE_VALID(p->two)) {
1750 diff_populate_filespec(p->two, 1);
1751 copied = 0;
1752 added = p->two->size;
1753 diff_free_filespec_data(p->two);
1754 } else
1755 continue;
1756 /*
1758 * Original minus copied is the removed material,
1759 * added is the new material. They are both damages
1760 * made to the preimage.
1761 * If the resulting damage is zero, we know that
1762 * diffcore_count_changes() considers the two entries to
1763 * be identical, but since content_changed is true, we
1764 * know that there must have been _some_ kind of change,
1765 * so we force all entries to have damage > 0.
1766 */
1767 damage = (p->one->size - copied) + added;
1768 if (!damage)
1769 damage = 1;
1770found_damage:
1772 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1773 dir.files[dir.nr].name = name;
1774 dir.files[dir.nr].changed = damage;
1775 changed += damage;
1776 dir.nr++;
1777 }
1778 /* This can happen even with many files, if everything was renames */
1780 if (!changed)
1781 return;
1782 /* Show all directories with more than x% of the changes */
1784 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1785 gather_dirstat(options, &dir, changed, "", 0);
1786}
1787static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1789{
1790 int i;
1791 unsigned long changed;
1792 struct dirstat_dir dir;
1793 if (data->nr == 0)
1795 return;
1796 dir.files = NULL;
1798 dir.alloc = 0;
1799 dir.nr = 0;
1800 dir.permille = options->dirstat_permille;
1801 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1802 changed = 0;
1804 for (i = 0; i < data->nr; i++) {
1805 struct diffstat_file *file = data->files[i];
1806 unsigned long damage = file->added + file->deleted;
1807 if (file->is_binary)
1808 /*
1809 * binary files counts bytes, not lines. Must find some
1810 * way to normalize binary bytes vs. textual lines.
1811 * The following heuristic assumes that there are 64
1812 * bytes per "line".
1813 * This is stupid and ugly, but very cheap...
1814 */
1815 damage = (damage + 63) / 64;
1816 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1817 dir.files[dir.nr].name = file->name;
1818 dir.files[dir.nr].changed = damage;
1819 changed += damage;
1820 dir.nr++;
1821 }
1822 /* This can happen even with many files, if everything was renames */
1824 if (!changed)
1825 return;
1826 /* Show all directories with more than x% of the changes */
1828 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1829 gather_dirstat(options, &dir, changed, "", 0);
1830}
1831static void free_diffstat_info(struct diffstat_t *diffstat)
1833{
1834 int i;
1835 for (i = 0; i < diffstat->nr; i++) {
1836 struct diffstat_file *f = diffstat->files[i];
1837 if (f->name != f->print_name)
1838 free(f->print_name);
1839 free(f->name);
1840 free(f->from_name);
1841 free(f);
1842 }
1843 free(diffstat->files);
1844}
1845struct checkdiff_t {
1847 const char *filename;
1848 int lineno;
1849 int conflict_marker_size;
1850 struct diff_options *o;
1851 unsigned ws_rule;
1852 unsigned status;
1853};
1854static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1856{
1857 char firstchar;
1858 int cnt;
1859 if (len < marker_size + 1)
1861 return 0;
1862 firstchar = line[0];
1863 switch (firstchar) {
1864 case '=': case '>': case '<': case '|':
1865 break;
1866 default:
1867 return 0;
1868 }
1869 for (cnt = 1; cnt < marker_size; cnt++)
1870 if (line[cnt] != firstchar)
1871 return 0;
1872 /* line[1] thru line[marker_size-1] are same as firstchar */
1873 if (len < marker_size + 1 || !isspace(line[marker_size]))
1874 return 0;
1875 return 1;
1876}
1877static void checkdiff_consume(void *priv, char *line, unsigned long len)
1879{
1880 struct checkdiff_t *data = priv;
1881 int marker_size = data->conflict_marker_size;
1882 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1883 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1884 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
1885 char *err;
1886 char *line_prefix = "";
1887 struct strbuf *msgbuf;
1888 assert(data->o);
1890 if (data->o->output_prefix) {
1891 msgbuf = data->o->output_prefix(data->o,
1892 data->o->output_prefix_data);
1893 line_prefix = msgbuf->buf;
1894 }
1895 if (line[0] == '+') {
1897 unsigned bad;
1898 data->lineno++;
1899 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1900 data->status |= 1;
1901 fprintf(data->o->file,
1902 "%s%s:%d: leftover conflict marker\n",
1903 line_prefix, data->filename, data->lineno);
1904 }
1905 bad = ws_check(line + 1, len - 1, data->ws_rule);
1906 if (!bad)
1907 return;
1908 data->status |= bad;
1909 err = whitespace_error_string(bad);
1910 fprintf(data->o->file, "%s%s:%d: %s.\n",
1911 line_prefix, data->filename, data->lineno, err);
1912 free(err);
1913 emit_line(data->o, set, reset, line, 1);
1914 ws_check_emit(line + 1, len - 1, data->ws_rule,
1915 data->o->file, set, reset, ws);
1916 } else if (line[0] == ' ') {
1917 data->lineno++;
1918 } else if (line[0] == '@') {
1919 char *plus = strchr(line, '+');
1920 if (plus)
1921 data->lineno = strtol(plus, NULL, 10) - 1;
1922 else
1923 die("invalid diff");
1924 }
1925}
1926static unsigned char *deflate_it(char *data,
1928 unsigned long size,
1929 unsigned long *result_size)
1930{
1931 int bound;
1932 unsigned char *deflated;
1933 git_zstream stream;
1934 memset(&stream, 0, sizeof(stream));
1936 git_deflate_init(&stream, zlib_compression_level);
1937 bound = git_deflate_bound(&stream, size);
1938 deflated = xmalloc(bound);
1939 stream.next_out = deflated;
1940 stream.avail_out = bound;
1941 stream.next_in = (unsigned char *)data;
1943 stream.avail_in = size;
1944 while (git_deflate(&stream, Z_FINISH) == Z_OK)
1945 ; /* nothing */
1946 git_deflate_end(&stream);
1947 *result_size = stream.total_out;
1948 return deflated;
1949}
1950static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1952{
1953 void *cp;
1954 void *delta;
1955 void *deflated;
1956 void *data;
1957 unsigned long orig_size;
1958 unsigned long delta_size;
1959 unsigned long deflate_size;
1960 unsigned long data_size;
1961 /* We could do deflated delta, or we could do just deflated two,
1963 * whichever is smaller.
1964 */
1965 delta = NULL;
1966 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1967 if (one->size && two->size) {
1968 delta = diff_delta(one->ptr, one->size,
1969 two->ptr, two->size,
1970 &delta_size, deflate_size);
1971 if (delta) {
1972 void *to_free = delta;
1973 orig_size = delta_size;
1974 delta = deflate_it(delta, delta_size, &delta_size);
1975 free(to_free);
1976 }
1977 }
1978 if (delta && delta_size < deflate_size) {
1980 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1981 free(deflated);
1982 data = delta;
1983 data_size = delta_size;
1984 }
1985 else {
1986 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1987 free(delta);
1988 data = deflated;
1989 data_size = deflate_size;
1990 }
1991 /* emit data encoded in base85 */
1993 cp = data;
1994 while (data_size) {
1995 int bytes = (52 < data_size) ? 52 : data_size;
1996 char line[70];
1997 data_size -= bytes;
1998 if (bytes <= 26)
1999 line[0] = bytes + 'A' - 1;
2000 else
2001 line[0] = bytes - 26 + 'a' - 1;
2002 encode_85(line + 1, cp, bytes);
2003 cp = (char *) cp + bytes;
2004 fprintf(file, "%s", prefix);
2005 fputs(line, file);
2006 fputc('\n', file);
2007 }
2008 fprintf(file, "%s\n", prefix);
2009 free(data);
2010}
2011static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2013{
2014 fprintf(file, "%sGIT binary patch\n", prefix);
2015 emit_binary_diff_body(file, one, two, prefix);
2016 emit_binary_diff_body(file, two, one, prefix);
2017}
2018static void diff_filespec_load_driver(struct diff_filespec *one)
2020{
2021 /* Use already-loaded driver */
2022 if (one->driver)
2023 return;
2024 if (S_ISREG(one->mode))
2026 one->driver = userdiff_find_by_path(one->path);
2027 /* Fallback to default settings */
2029 if (!one->driver)
2030 one->driver = userdiff_find_by_name("default");
2031}
2032int diff_filespec_is_binary(struct diff_filespec *one)
2034{
2035 if (one->is_binary == -1) {
2036 diff_filespec_load_driver(one);
2037 if (one->driver->binary != -1)
2038 one->is_binary = one->driver->binary;
2039 else {
2040 if (!one->data && DIFF_FILE_VALID(one))
2041 diff_populate_filespec(one, 0);
2042 if (one->data)
2043 one->is_binary = buffer_is_binary(one->data,
2044 one->size);
2045 if (one->is_binary == -1)
2046 one->is_binary = 0;
2047 }
2048 }
2049 return one->is_binary;
2050}
2051static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2053{
2054 diff_filespec_load_driver(one);
2055 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2056}
2057static const char *userdiff_word_regex(struct diff_filespec *one)
2059{
2060 diff_filespec_load_driver(one);
2061 return one->driver->word_regex;
2062}
2063void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2065{
2066 if (!options->a_prefix)
2067 options->a_prefix = a;
2068 if (!options->b_prefix)
2069 options->b_prefix = b;
2070}
2071struct userdiff_driver *get_textconv(struct diff_filespec *one)
2073{
2074 if (!DIFF_FILE_VALID(one))
2075 return NULL;
2076 diff_filespec_load_driver(one);
2078 return userdiff_get_textconv(one->driver);
2079}
2080static void builtin_diff(const char *name_a,
2082 const char *name_b,
2083 struct diff_filespec *one,
2084 struct diff_filespec *two,
2085 const char *xfrm_msg,
2086 int must_show_header,
2087 struct diff_options *o,
2088 int complete_rewrite)
2089{
2090 mmfile_t mf1, mf2;
2091 const char *lbl[2];
2092 char *a_one, *b_two;
2093 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2094 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2095 const char *a_prefix, *b_prefix;
2096 struct userdiff_driver *textconv_one = NULL;
2097 struct userdiff_driver *textconv_two = NULL;
2098 struct strbuf header = STRBUF_INIT;
2099 struct strbuf *msgbuf;
2100 char *line_prefix = "";
2101 if (o->output_prefix) {
2103 msgbuf = o->output_prefix(o, o->output_prefix_data);
2104 line_prefix = msgbuf->buf;
2105 }
2106 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2108 (!one->mode || S_ISGITLINK(one->mode)) &&
2109 (!two->mode || S_ISGITLINK(two->mode))) {
2110 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2111 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2112 show_submodule_summary(o->file, one ? one->path : two->path,
2113 one->sha1, two->sha1, two->dirty_submodule,
2114 del, add, reset);
2115 return;
2116 }
2117 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2119 textconv_one = get_textconv(one);
2120 textconv_two = get_textconv(two);
2121 }
2122 diff_set_mnemonic_prefix(o, "a/", "b/");
2124 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2125 a_prefix = o->b_prefix;
2126 b_prefix = o->a_prefix;
2127 } else {
2128 a_prefix = o->a_prefix;
2129 b_prefix = o->b_prefix;
2130 }
2131 /* Never use a non-valid filename anywhere if at all possible */
2133 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2134 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2135 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2137 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2138 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2139 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2140 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2141 if (lbl[0][0] == '/') {
2142 /* /dev/null */
2143 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2144 if (xfrm_msg)
2145 strbuf_addstr(&header, xfrm_msg);
2146 must_show_header = 1;
2147 }
2148 else if (lbl[1][0] == '/') {
2149 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2150 if (xfrm_msg)
2151 strbuf_addstr(&header, xfrm_msg);
2152 must_show_header = 1;
2153 }
2154 else {
2155 if (one->mode != two->mode) {
2156 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2157 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2158 must_show_header = 1;
2159 }
2160 if (xfrm_msg)
2161 strbuf_addstr(&header, xfrm_msg);
2162 /*
2164 * we do not run diff between different kind
2165 * of objects.
2166 */
2167 if ((one->mode ^ two->mode) & S_IFMT)
2168 goto free_ab_and_return;
2169 if (complete_rewrite &&
2170 (textconv_one || !diff_filespec_is_binary(one)) &&
2171 (textconv_two || !diff_filespec_is_binary(two))) {
2172 fprintf(o->file, "%s", header.buf);
2173 strbuf_reset(&header);
2174 emit_rewrite_diff(name_a, name_b, one, two,
2175 textconv_one, textconv_two, o);
2176 o->found_changes = 1;
2177 goto free_ab_and_return;
2178 }
2179 }
2180 if (o->irreversible_delete && lbl[1][0] == '/') {
2182 fprintf(o->file, "%s", header.buf);
2183 strbuf_reset(&header);
2184 goto free_ab_and_return;
2185 } else if (!DIFF_OPT_TST(o, TEXT) &&
2186 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2187 (!textconv_two && diff_filespec_is_binary(two)) )) {
2188 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2189 die("unable to read files to diff");
2190 /* Quite common confusing case */
2191 if (mf1.size == mf2.size &&
2192 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2193 if (must_show_header)
2194 fprintf(o->file, "%s", header.buf);
2195 goto free_ab_and_return;
2196 }
2197 fprintf(o->file, "%s", header.buf);
2198 strbuf_reset(&header);
2199 if (DIFF_OPT_TST(o, BINARY))
2200 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2201 else
2202 fprintf(o->file, "%sBinary files %s and %s differ\n",
2203 line_prefix, lbl[0], lbl[1]);
2204 o->found_changes = 1;
2205 } else {
2206 /* Crazy xdl interfaces.. */
2207 const char *diffopts = getenv("GIT_DIFF_OPTS");
2208 xpparam_t xpp;
2209 xdemitconf_t xecfg;
2210 struct emit_callback ecbdata;
2211 const struct userdiff_funcname *pe;
2212 if (must_show_header) {
2214 fprintf(o->file, "%s", header.buf);
2215 strbuf_reset(&header);
2216 }
2217 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2219 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2220 pe = diff_funcname_pattern(one);
2222 if (!pe)
2223 pe = diff_funcname_pattern(two);
2224 memset(&xpp, 0, sizeof(xpp));
2226 memset(&xecfg, 0, sizeof(xecfg));
2227 memset(&ecbdata, 0, sizeof(ecbdata));
2228 ecbdata.label_path = lbl;
2229 ecbdata.color_diff = want_color(o->use_color);
2230 ecbdata.found_changesp = &o->found_changes;
2231 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2232 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2233 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2234 ecbdata.opt = o;
2235 ecbdata.header = header.len ? &header : NULL;
2236 xpp.flags = o->xdl_opts;
2237 xecfg.ctxlen = o->context;
2238 xecfg.interhunkctxlen = o->interhunkcontext;
2239 xecfg.flags = XDL_EMIT_FUNCNAMES;
2240 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2241 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2242 if (pe)
2243 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2244 if (!diffopts)
2245 ;
2246 else if (!prefixcmp(diffopts, "--unified="))
2247 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2248 else if (!prefixcmp(diffopts, "-u"))
2249 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2250 if (o->word_diff) {
2251 int i;
2252 ecbdata.diff_words =
2254 xcalloc(1, sizeof(struct diff_words_data));
2255 ecbdata.diff_words->type = o->word_diff;
2256 ecbdata.diff_words->opt = o;
2257 if (!o->word_regex)
2258 o->word_regex = userdiff_word_regex(one);
2259 if (!o->word_regex)
2260 o->word_regex = userdiff_word_regex(two);
2261 if (!o->word_regex)
2262 o->word_regex = diff_word_regex_cfg;
2263 if (o->word_regex) {
2264 ecbdata.diff_words->word_regex = (regex_t *)
2265 xmalloc(sizeof(regex_t));
2266 if (regcomp(ecbdata.diff_words->word_regex,
2267 o->word_regex,
2268 REG_EXTENDED | REG_NEWLINE))
2269 die ("Invalid regular expression: %s",
2270 o->word_regex);
2271 }
2272 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2273 if (o->word_diff == diff_words_styles[i].type) {
2274 ecbdata.diff_words->style =
2275 &diff_words_styles[i];
2276 break;
2277 }
2278 }
2279 if (want_color(o->use_color)) {
2280 struct diff_words_style *st = ecbdata.diff_words->style;
2281 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2282 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2283 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2284 }
2285 }
2286 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2287 &xpp, &xecfg);
2288 if (o->word_diff)
2289 free_diff_words_data(&ecbdata);
2290 if (textconv_one)
2291 free(mf1.ptr);
2292 if (textconv_two)
2293 free(mf2.ptr);
2294 xdiff_clear_find_func(&xecfg);
2295 }
2296 free_ab_and_return:
2298 strbuf_release(&header);
2299 diff_free_filespec_data(one);
2300 diff_free_filespec_data(two);
2301 free(a_one);
2302 free(b_two);
2303 return;
2304}
2305static void builtin_diffstat(const char *name_a, const char *name_b,
2307 struct diff_filespec *one,
2308 struct diff_filespec *two,
2309 struct diffstat_t *diffstat,
2310 struct diff_options *o,
2311 int complete_rewrite)
2312{
2313 mmfile_t mf1, mf2;
2314 struct diffstat_file *data;
2315 data = diffstat_add(diffstat, name_a, name_b);
2317 if (!one || !two) {
2319 data->is_unmerged = 1;
2320 return;
2321 }
2322 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2324 data->is_binary = 1;
2325 data->added = diff_filespec_size(two);
2326 data->deleted = diff_filespec_size(one);
2327 }
2328 else if (complete_rewrite) {
2330 diff_populate_filespec(one, 0);
2331 diff_populate_filespec(two, 0);
2332 data->deleted = count_lines(one->data, one->size);
2333 data->added = count_lines(two->data, two->size);
2334 }
2335 else {
2337 /* Crazy xdl interfaces.. */
2338 xpparam_t xpp;
2339 xdemitconf_t xecfg;
2340 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2342 die("unable to read files to diff");
2343 memset(&xpp, 0, sizeof(xpp));
2345 memset(&xecfg, 0, sizeof(xecfg));
2346 xpp.flags = o->xdl_opts;
2347 xecfg.ctxlen = o->context;
2348 xecfg.interhunkctxlen = o->interhunkcontext;
2349 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2350 &xpp, &xecfg);
2351 }
2352 diff_free_filespec_data(one);
2354 diff_free_filespec_data(two);
2355}
2356static void builtin_checkdiff(const char *name_a, const char *name_b,
2358 const char *attr_path,
2359 struct diff_filespec *one,
2360 struct diff_filespec *two,
2361 struct diff_options *o)
2362{
2363 mmfile_t mf1, mf2;
2364 struct checkdiff_t data;
2365 if (!two)
2367 return;
2368 memset(&data, 0, sizeof(data));
2370 data.filename = name_b ? name_b : name_a;
2371 data.lineno = 0;
2372 data.o = o;
2373 data.ws_rule = whitespace_rule(attr_path);
2374 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2375 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2377 die("unable to read files to diff");
2378 /*
2380 * All the other codepaths check both sides, but not checking
2381 * the "old" side here is deliberate. We are checking the newly
2382 * introduced changes, and as long as the "new" side is text, we
2383 * can and should check what it introduces.
2384 */
2385 if (diff_filespec_is_binary(two))
2386 goto free_and_return;
2387 else {
2388 /* Crazy xdl interfaces.. */
2389 xpparam_t xpp;
2390 xdemitconf_t xecfg;
2391 memset(&xpp, 0, sizeof(xpp));
2393 memset(&xecfg, 0, sizeof(xecfg));
2394 xecfg.ctxlen = 1; /* at least one context line */
2395 xpp.flags = 0;
2396 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2397 &xpp, &xecfg);
2398 if (data.ws_rule & WS_BLANK_AT_EOF) {
2400 struct emit_callback ecbdata;
2401 int blank_at_eof;
2402 ecbdata.ws_rule = data.ws_rule;
2404 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2405 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2406 if (blank_at_eof) {
2408 static char *err;
2409 if (!err)
2410 err = whitespace_error_string(WS_BLANK_AT_EOF);
2411 fprintf(o->file, "%s:%d: %s.\n",
2412 data.filename, blank_at_eof, err);
2413 data.status = 1; /* report errors */
2414 }
2415 }
2416 }
2417 free_and_return:
2418 diff_free_filespec_data(one);
2419 diff_free_filespec_data(two);
2420 if (data.status)
2421 DIFF_OPT_SET(o, CHECK_FAILED);
2422}
2423struct diff_filespec *alloc_filespec(const char *path)
2425{
2426 int namelen = strlen(path);
2427 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2428 memset(spec, 0, sizeof(*spec));
2430 spec->path = (char *)(spec + 1);
2431 memcpy(spec->path, path, namelen+1);
2432 spec->count = 1;
2433 spec->is_binary = -1;
2434 return spec;
2435}
2436void free_filespec(struct diff_filespec *spec)
2438{
2439 if (!--spec->count) {
2440 diff_free_filespec_data(spec);
2441 free(spec);
2442 }
2443}
2444void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2446 unsigned short mode)
2447{
2448 if (mode) {
2449 spec->mode = canon_mode(mode);
2450 hashcpy(spec->sha1, sha1);
2451 spec->sha1_valid = !is_null_sha1(sha1);
2452 }
2453}
2454/*
2456 * Given a name and sha1 pair, if the index tells us the file in
2457 * the work tree has that object contents, return true, so that
2458 * prepare_temp_file() does not have to inflate and extract.
2459 */
2460static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2461{
2462 struct cache_entry *ce;
2463 struct stat st;
2464 int pos, len;
2465 /*
2467 * We do not read the cache ourselves here, because the
2468 * benchmark with my previous version that always reads cache
2469 * shows that it makes things worse for diff-tree comparing
2470 * two linux-2.6 kernel trees in an already checked out work
2471 * tree. This is because most diff-tree comparisons deal with
2472 * only a small number of files, while reading the cache is
2473 * expensive for a large project, and its cost outweighs the
2474 * savings we get by not inflating the object to a temporary
2475 * file. Practically, this code only helps when we are used
2476 * by diff-cache --cached, which does read the cache before
2477 * calling us.
2478 */
2479 if (!active_cache)
2480 return 0;
2481 /* We want to avoid the working directory if our caller
2483 * doesn't need the data in a normal file, this system
2484 * is rather slow with its stat/open/mmap/close syscalls,
2485 * and the object is contained in a pack file. The pack
2486 * is probably already open and will be faster to obtain
2487 * the data through than the working directory. Loose
2488 * objects however would tend to be slower as they need
2489 * to be individually opened and inflated.
2490 */
2491 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2492 return 0;
2493 len = strlen(name);
2495 pos = cache_name_pos(name, len);
2496 if (pos < 0)
2497 return 0;
2498 ce = active_cache[pos];
2499 /*
2501 * This is not the sha1 we are looking for, or
2502 * unreusable because it is not a regular file.
2503 */
2504 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2505 return 0;
2506 /*
2508 * If ce is marked as "assume unchanged", there is no
2509 * guarantee that work tree matches what we are looking for.
2510 */
2511 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2512 return 0;
2513 /*
2515 * If ce matches the file in the work tree, we can reuse it.
2516 */
2517 if (ce_uptodate(ce) ||
2518 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2519 return 1;
2520 return 0;
2522}
2523static int populate_from_stdin(struct diff_filespec *s)
2525{
2526 struct strbuf buf = STRBUF_INIT;
2527 size_t size = 0;
2528 if (strbuf_read(&buf, 0, 0) < 0)
2530 return error("error while reading from stdin %s",
2531 strerror(errno));
2532 s->should_munmap = 0;
2534 s->data = strbuf_detach(&buf, &size);
2535 s->size = size;
2536 s->should_free = 1;
2537 return 0;
2538}
2539static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2541{
2542 int len;
2543 char *data = xmalloc(100), *dirty = "";
2544 /* Are we looking at the work tree? */
2546 if (s->dirty_submodule)
2547 dirty = "-dirty";
2548 len = snprintf(data, 100,
2550 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2551 s->data = data;
2552 s->size = len;
2553 s->should_free = 1;
2554 if (size_only) {
2555 s->data = NULL;
2556 free(data);
2557 }
2558 return 0;
2559}
2560/*
2562 * While doing rename detection and pickaxe operation, we may need to
2563 * grab the data for the blob (or file) for our own in-core comparison.
2564 * diff_filespec has data and size fields for this purpose.
2565 */
2566int diff_populate_filespec(struct diff_filespec *s, int size_only)
2567{
2568 int err = 0;
2569 if (!DIFF_FILE_VALID(s))
2570 die("internal error: asking to populate invalid file.");
2571 if (S_ISDIR(s->mode))
2572 return -1;
2573 if (s->data)
2575 return 0;
2576 if (size_only && 0 < s->size)
2578 return 0;
2579 if (S_ISGITLINK(s->mode))
2581 return diff_populate_gitlink(s, size_only);
2582 if (!s->sha1_valid ||
2584 reuse_worktree_file(s->path, s->sha1, 0)) {
2585 struct strbuf buf = STRBUF_INIT;
2586 struct stat st;
2587 int fd;
2588 if (!strcmp(s->path, "-"))
2590 return populate_from_stdin(s);
2591 if (lstat(s->path, &st) < 0) {
2593 if (errno == ENOENT) {
2594 err_empty:
2595 err = -1;
2596 empty:
2597 s->data = (char *)"";
2598 s->size = 0;
2599 return err;
2600 }
2601 }
2602 s->size = xsize_t(st.st_size);
2603 if (!s->size)
2604 goto empty;
2605 if (S_ISLNK(st.st_mode)) {
2606 struct strbuf sb = STRBUF_INIT;
2607 if (strbuf_readlink(&sb, s->path, s->size))
2609 goto err_empty;
2610 s->size = sb.len;
2611 s->data = strbuf_detach(&sb, NULL);
2612 s->should_free = 1;
2613 return 0;
2614 }
2615 if (size_only)
2616 return 0;
2617 fd = open(s->path, O_RDONLY);
2618 if (fd < 0)
2619 goto err_empty;
2620 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2621 close(fd);
2622 s->should_munmap = 1;
2623 /*
2625 * Convert from working tree format to canonical git format
2626 */
2627 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2628 size_t size = 0;
2629 munmap(s->data, s->size);
2630 s->should_munmap = 0;
2631 s->data = strbuf_detach(&buf, &size);
2632 s->size = size;
2633 s->should_free = 1;
2634 }
2635 }
2636 else {
2637 enum object_type type;
2638 if (size_only) {
2639 type = sha1_object_info(s->sha1, &s->size);
2640 if (type < 0)
2641 die("unable to read %s", sha1_to_hex(s->sha1));
2642 } else {
2643 s->data = read_sha1_file(s->sha1, &type, &s->size);
2644 if (!s->data)
2645 die("unable to read %s", sha1_to_hex(s->sha1));
2646 s->should_free = 1;
2647 }
2648 }
2649 return 0;
2650}
2651void diff_free_filespec_blob(struct diff_filespec *s)
2653{
2654 if (s->should_free)
2655 free(s->data);
2656 else if (s->should_munmap)
2657 munmap(s->data, s->size);
2658 if (s->should_free || s->should_munmap) {
2660 s->should_free = s->should_munmap = 0;
2661 s->data = NULL;
2662 }
2663}
2664void diff_free_filespec_data(struct diff_filespec *s)
2666{
2667 diff_free_filespec_blob(s);
2668 free(s->cnt_data);
2669 s->cnt_data = NULL;
2670}
2671static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2673 void *blob,
2674 unsigned long size,
2675 const unsigned char *sha1,
2676 int mode)
2677{
2678 int fd;
2679 struct strbuf buf = STRBUF_INIT;
2680 struct strbuf template = STRBUF_INIT;
2681 char *path_dup = xstrdup(path);
2682 const char *base = basename(path_dup);
2683 /* Generate "XXXXXX_basename.ext" */
2685 strbuf_addstr(&template, "XXXXXX_");
2686 strbuf_addstr(&template, base);
2687 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2689 strlen(base) + 1);
2690 if (fd < 0)
2691 die_errno("unable to create temp-file");
2692 if (convert_to_working_tree(path,
2693 (const char *)blob, (size_t)size, &buf)) {
2694 blob = buf.buf;
2695 size = buf.len;
2696 }
2697 if (write_in_full(fd, blob, size) != size)
2698 die_errno("unable to write temp-file");
2699 close(fd);
2700 temp->name = temp->tmp_path;
2701 strcpy(temp->hex, sha1_to_hex(sha1));
2702 temp->hex[40] = 0;
2703 sprintf(temp->mode, "%06o", mode);
2704 strbuf_release(&buf);
2705 strbuf_release(&template);
2706 free(path_dup);
2707}
2708static struct diff_tempfile *prepare_temp_file(const char *name,
2710 struct diff_filespec *one)
2711{
2712 struct diff_tempfile *temp = claim_diff_tempfile();
2713 if (!DIFF_FILE_VALID(one)) {
2715 not_a_valid_file:
2716 /* A '-' entry produces this for file-2, and
2717 * a '+' entry produces this for file-1.
2718 */
2719 temp->name = "/dev/null";
2720 strcpy(temp->hex, ".");
2721 strcpy(temp->mode, ".");
2722 return temp;
2723 }
2724 if (!remove_tempfile_installed) {
2726 atexit(remove_tempfile);
2727 sigchain_push_common(remove_tempfile_on_signal);
2728 remove_tempfile_installed = 1;
2729 }
2730 if (!one->sha1_valid ||
2732 reuse_worktree_file(name, one->sha1, 1)) {
2733 struct stat st;
2734 if (lstat(name, &st) < 0) {
2735 if (errno == ENOENT)
2736 goto not_a_valid_file;
2737 die_errno("stat(%s)", name);
2738 }
2739 if (S_ISLNK(st.st_mode)) {
2740 struct strbuf sb = STRBUF_INIT;
2741 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2742 die_errno("readlink(%s)", name);
2743 prep_temp_blob(name, temp, sb.buf, sb.len,
2744 (one->sha1_valid ?
2745 one->sha1 : null_sha1),
2746 (one->sha1_valid ?
2747 one->mode : S_IFLNK));
2748 strbuf_release(&sb);
2749 }
2750 else {
2751 /* we can borrow from the file in the work tree */
2752 temp->name = name;
2753 if (!one->sha1_valid)
2754 strcpy(temp->hex, sha1_to_hex(null_sha1));
2755 else
2756 strcpy(temp->hex, sha1_to_hex(one->sha1));
2757 /* Even though we may sometimes borrow the
2758 * contents from the work tree, we always want
2759 * one->mode. mode is trustworthy even when
2760 * !(one->sha1_valid), as long as
2761 * DIFF_FILE_VALID(one).
2762 */
2763 sprintf(temp->mode, "%06o", one->mode);
2764 }
2765 return temp;
2766 }
2767 else {
2768 if (diff_populate_filespec(one, 0))
2769 die("cannot read data blob for %s", one->path);
2770 prep_temp_blob(name, temp, one->data, one->size,
2771 one->sha1, one->mode);
2772 }
2773 return temp;
2774}
2775/* An external diff command takes:
2777 *
2778 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2779 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2780 *
2781 */
2782static void run_external_diff(const char *pgm,
2783 const char *name,
2784 const char *other,
2785 struct diff_filespec *one,
2786 struct diff_filespec *two,
2787 const char *xfrm_msg,
2788 int complete_rewrite)
2789{
2790 const char *spawn_arg[10];
2791 int retval;
2792 const char **arg = &spawn_arg[0];
2793 if (one && two) {
2795 struct diff_tempfile *temp_one, *temp_two;
2796 const char *othername = (other ? other : name);
2797 temp_one = prepare_temp_file(name, one);
2798 temp_two = prepare_temp_file(othername, two);
2799 *arg++ = pgm;
2800 *arg++ = name;
2801 *arg++ = temp_one->name;
2802 *arg++ = temp_one->hex;
2803 *arg++ = temp_one->mode;
2804 *arg++ = temp_two->name;
2805 *arg++ = temp_two->hex;
2806 *arg++ = temp_two->mode;
2807 if (other) {
2808 *arg++ = other;
2809 *arg++ = xfrm_msg;
2810 }
2811 } else {
2812 *arg++ = pgm;
2813 *arg++ = name;
2814 }
2815 *arg = NULL;
2816 fflush(NULL);
2817 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2818 remove_tempfile();
2819 if (retval) {
2820 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2821 exit(1);
2822 }
2823}
2824static int similarity_index(struct diff_filepair *p)
2826{
2827 return p->score * 100 / MAX_SCORE;
2828}
2829static void fill_metainfo(struct strbuf *msg,
2831 const char *name,
2832 const char *other,
2833 struct diff_filespec *one,
2834 struct diff_filespec *two,
2835 struct diff_options *o,
2836 struct diff_filepair *p,
2837 int *must_show_header,
2838 int use_color)
2839{
2840 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2841 const char *reset = diff_get_color(use_color, DIFF_RESET);
2842 struct strbuf *msgbuf;
2843 char *line_prefix = "";
2844 *must_show_header = 1;
2846 if (o->output_prefix) {
2847 msgbuf = o->output_prefix(o, o->output_prefix_data);
2848 line_prefix = msgbuf->buf;
2849 }
2850 strbuf_init(msg, PATH_MAX * 2 + 300);
2851 switch (p->status) {
2852 case DIFF_STATUS_COPIED:
2853 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2854 line_prefix, set, similarity_index(p));
2855 strbuf_addf(msg, "%s\n%s%scopy from ",
2856 reset, line_prefix, set);
2857 quote_c_style(name, msg, NULL, 0);
2858 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2859 quote_c_style(other, msg, NULL, 0);
2860 strbuf_addf(msg, "%s\n", reset);
2861 break;
2862 case DIFF_STATUS_RENAMED:
2863 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2864 line_prefix, set, similarity_index(p));
2865 strbuf_addf(msg, "%s\n%s%srename from ",
2866 reset, line_prefix, set);
2867 quote_c_style(name, msg, NULL, 0);
2868 strbuf_addf(msg, "%s\n%s%srename to ",
2869 reset, line_prefix, set);
2870 quote_c_style(other, msg, NULL, 0);
2871 strbuf_addf(msg, "%s\n", reset);
2872 break;
2873 case DIFF_STATUS_MODIFIED:
2874 if (p->score) {
2875 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2876 line_prefix,
2877 set, similarity_index(p), reset);
2878 break;
2879 }
2880 /* fallthru */
2881 default:
2882 *must_show_header = 0;
2883 }
2884 if (one && two && hashcmp(one->sha1, two->sha1)) {
2885 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2886 if (DIFF_OPT_TST(o, BINARY)) {
2888 mmfile_t mf;
2889 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2890 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2891 abbrev = 40;
2892 }
2893 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2894 find_unique_abbrev(one->sha1, abbrev));
2895 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2896 if (one->mode == two->mode)
2897 strbuf_addf(msg, " %06o", one->mode);
2898 strbuf_addf(msg, "%s\n", reset);
2899 }
2900}
2901static void run_diff_cmd(const char *pgm,
2903 const char *name,
2904 const char *other,
2905 const char *attr_path,
2906 struct diff_filespec *one,
2907 struct diff_filespec *two,
2908 struct strbuf *msg,
2909 struct diff_options *o,
2910 struct diff_filepair *p)
2911{
2912 const char *xfrm_msg = NULL;
2913 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2914 int must_show_header = 0;
2915 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2917 pgm = NULL;
2918 else {
2919 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2920 if (drv && drv->external)
2921 pgm = drv->external;
2922 }
2923 if (msg) {
2925 /*
2926 * don't use colors when the header is intended for an
2927 * external diff driver
2928 */
2929 fill_metainfo(msg, name, other, one, two, o, p,
2930 &must_show_header,
2931 want_color(o->use_color) && !pgm);
2932 xfrm_msg = msg->len ? msg->buf : NULL;
2933 }
2934 if (pgm) {
2936 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2937 complete_rewrite);
2938 return;
2939 }
2940 if (one && two)
2941 builtin_diff(name, other ? other : name,
2942 one, two, xfrm_msg, must_show_header,
2943 o, complete_rewrite);
2944 else
2945 fprintf(o->file, "* Unmerged path %s\n", name);
2946}
2947static void diff_fill_sha1_info(struct diff_filespec *one)
2949{
2950 if (DIFF_FILE_VALID(one)) {
2951 if (!one->sha1_valid) {
2952 struct stat st;
2953 if (!strcmp(one->path, "-")) {
2954 hashcpy(one->sha1, null_sha1);
2955 return;
2956 }
2957 if (lstat(one->path, &st) < 0)
2958 die_errno("stat '%s'", one->path);
2959 if (index_path(one->sha1, one->path, &st, 0))
2960 die("cannot hash %s", one->path);
2961 }
2962 }
2963 else
2964 hashclr(one->sha1);
2965}
2966static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2968{
2969 /* Strip the prefix but do not molest /dev/null and absolute paths */
2970 if (*namep && **namep != '/') {
2971 *namep += prefix_length;
2972 if (**namep == '/')
2973 ++*namep;
2974 }
2975 if (*otherp && **otherp != '/') {
2976 *otherp += prefix_length;
2977 if (**otherp == '/')
2978 ++*otherp;
2979 }
2980}
2981static void run_diff(struct diff_filepair *p, struct diff_options *o)
2983{
2984 const char *pgm = external_diff();
2985 struct strbuf msg;
2986 struct diff_filespec *one = p->one;
2987 struct diff_filespec *two = p->two;
2988 const char *name;
2989 const char *other;
2990 const char *attr_path;
2991 name = p->one->path;
2993 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2994 attr_path = name;
2995 if (o->prefix_length)
2996 strip_prefix(o->prefix_length, &name, &other);
2997 if (DIFF_PAIR_UNMERGED(p)) {
2999 run_diff_cmd(pgm, name, NULL, attr_path,
3000 NULL, NULL, NULL, o, p);
3001 return;
3002 }
3003 diff_fill_sha1_info(one);
3005 diff_fill_sha1_info(two);
3006 if (!pgm &&
3008 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3009 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3010 /*
3011 * a filepair that changes between file and symlink
3012 * needs to be split into deletion and creation.
3013 */
3014 struct diff_filespec *null = alloc_filespec(two->path);
3015 run_diff_cmd(NULL, name, other, attr_path,
3016 one, null, &msg, o, p);
3017 free(null);
3018 strbuf_release(&msg);
3019 null = alloc_filespec(one->path);
3021 run_diff_cmd(NULL, name, other, attr_path,
3022 null, two, &msg, o, p);
3023 free(null);
3024 }
3025 else
3026 run_diff_cmd(pgm, name, other, attr_path,
3027 one, two, &msg, o, p);
3028 strbuf_release(&msg);
3030}
3031static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3033 struct diffstat_t *diffstat)
3034{
3035 const char *name;
3036 const char *other;
3037 int complete_rewrite = 0;
3038 if (DIFF_PAIR_UNMERGED(p)) {
3040 /* unmerged */
3041 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
3042 return;
3043 }
3044 name = p->one->path;
3046 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3047 if (o->prefix_length)
3049 strip_prefix(o->prefix_length, &name, &other);
3050 diff_fill_sha1_info(p->one);
3052 diff_fill_sha1_info(p->two);
3053 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3055 complete_rewrite = 1;
3056 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
3057}
3058static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3060{
3061 const char *name;
3062 const char *other;
3063 const char *attr_path;
3064 if (DIFF_PAIR_UNMERGED(p)) {
3066 /* unmerged */
3067 return;
3068 }
3069 name = p->one->path;
3071 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3072 attr_path = other ? other : name;
3073 if (o->prefix_length)
3075 strip_prefix(o->prefix_length, &name, &other);
3076 diff_fill_sha1_info(p->one);
3078 diff_fill_sha1_info(p->two);
3079 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3081}
3082void diff_setup(struct diff_options *options)
3084{
3085 memcpy(options, &default_diff_options, sizeof(*options));
3086 options->file = stdout;
3088 options->line_termination = '\n';
3090 options->break_opt = -1;
3091 options->rename_limit = -1;
3092 options->dirstat_permille = diff_dirstat_permille_default;
3093 options->context = 3;
3094 options->change = diff_change;
3096 options->add_remove = diff_addremove;
3097 options->use_color = diff_use_color_default;
3098 options->detect_rename = diff_detect_rename_default;
3099 if (diff_no_prefix) {
3101 options->a_prefix = options->b_prefix = "";
3102 } else if (!diff_mnemonic_prefix) {
3103 options->a_prefix = "a/";
3104 options->b_prefix = "b/";
3105 }
3106}
3107void diff_setup_done(struct diff_options *options)
3109{
3110 int count = 0;
3111 if (options->output_format & DIFF_FORMAT_NAME)
3113 count++;
3114 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3115 count++;
3116 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3117 count++;
3118 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3119 count++;
3120 if (count > 1)
3121 die("--name-only, --name-status, --check and -s are mutually exclusive");
3122 /*
3124 * Most of the time we can say "there are changes"
3125 * only by checking if there are changed paths, but
3126 * --ignore-whitespace* options force us to look
3127 * inside contents.
3128 */
3129 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3131 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3132 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3133 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3134 else
3135 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3136 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3138 options->detect_rename = DIFF_DETECT_COPY;
3139 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3141 options->prefix = NULL;
3142 if (options->prefix)
3143 options->prefix_length = strlen(options->prefix);
3144 else
3145 options->prefix_length = 0;
3146 if (options->output_format & (DIFF_FORMAT_NAME |
3148 DIFF_FORMAT_NAME_STATUS |
3149 DIFF_FORMAT_CHECKDIFF |
3150 DIFF_FORMAT_NO_OUTPUT))
3151 options->output_format &= ~(DIFF_FORMAT_RAW |
3152 DIFF_FORMAT_NUMSTAT |
3153 DIFF_FORMAT_DIFFSTAT |
3154 DIFF_FORMAT_SHORTSTAT |
3155 DIFF_FORMAT_DIRSTAT |
3156 DIFF_FORMAT_SUMMARY |
3157 DIFF_FORMAT_PATCH);
3158 /*
3160 * These cases always need recursive; we do not drop caller-supplied
3161 * recursive bits for other formats here.
3162 */
3163 if (options->output_format & (DIFF_FORMAT_PATCH |
3164 DIFF_FORMAT_NUMSTAT |
3165 DIFF_FORMAT_DIFFSTAT |
3166 DIFF_FORMAT_SHORTSTAT |
3167 DIFF_FORMAT_DIRSTAT |
3168 DIFF_FORMAT_SUMMARY |
3169 DIFF_FORMAT_CHECKDIFF))
3170 DIFF_OPT_SET(options, RECURSIVE);
3171 /*
3172 * Also pickaxe would not work very well if you do not say recursive
3173 */
3174 if (options->pickaxe)
3175 DIFF_OPT_SET(options, RECURSIVE);
3176 /*
3177 * When patches are generated, submodules diffed against the work tree
3178 * must be checked for dirtiness too so it can be shown in the output
3179 */
3180 if (options->output_format & DIFF_FORMAT_PATCH)
3181 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3182 if (options->detect_rename && options->rename_limit < 0)
3184 options->rename_limit = diff_rename_limit_default;
3185 if (options->setup & DIFF_SETUP_USE_CACHE) {
3186 if (!active_cache)
3187 /* read-cache does not die even when it fails
3188 * so it is safe for us to do this here. Also
3189 * it does not smudge active_cache or active_nr
3190 * when it fails, so we do not have to worry about
3191 * cleaning it up ourselves either.
3192 */
3193 read_cache();
3194 }
3195 if (options->abbrev <= 0 || 40 < options->abbrev)
3196 options->abbrev = 40; /* full */
3197 /*
3199 * It does not make sense to show the first hit we happened
3200 * to have found. It does not make sense not to return with
3201 * exit code in such a case either.
3202 */
3203 if (DIFF_OPT_TST(options, QUICK)) {
3204 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3205 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3206 }
3207}
3208static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3210{
3211 char c, *eq;
3212 int len;
3213 if (*arg != '-')
3215 return 0;
3216 c = *++arg;
3217 if (!c)
3218 return 0;
3219 if (c == arg_short) {
3220 c = *++arg;
3221 if (!c)
3222 return 1;
3223 if (val && isdigit(c)) {
3224 char *end;
3225 int n = strtoul(arg, &end, 10);
3226 if (*end)
3227 return 0;
3228 *val = n;
3229 return 1;
3230 }
3231 return 0;
3232 }
3233 if (c != '-')
3234 return 0;
3235 arg++;
3236 eq = strchr(arg, '=');
3237 if (eq)
3238 len = eq - arg;
3239 else
3240 len = strlen(arg);
3241 if (!len || strncmp(arg, arg_long, len))
3242 return 0;
3243 if (eq) {
3244 int n;
3245 char *end;
3246 if (!isdigit(*++eq))
3247 return 0;
3248 n = strtoul(eq, &end, 10);
3249 if (*end)
3250 return 0;
3251 *val = n;
3252 }
3253 return 1;
3254}
3255static int diff_scoreopt_parse(const char *opt);
3257static inline int short_opt(char opt, const char **argv,
3259 const char **optarg)
3260{
3261 const char *arg = argv[0];
3262 if (arg[0] != '-' || arg[1] != opt)
3263 return 0;
3264 if (arg[2] != '\0') {
3265 *optarg = arg + 2;
3266 return 1;
3267 }
3268 if (!argv[1])
3269 die("Option '%c' requires a value", opt);
3270 *optarg = argv[1];
3271 return 2;
3272}
3273int parse_long_opt(const char *opt, const char **argv,
3275 const char **optarg)
3276{
3277 const char *arg = argv[0];
3278 if (arg[0] != '-' || arg[1] != '-')
3279 return 0;
3280 arg += strlen("--");
3281 if (prefixcmp(arg, opt))
3282 return 0;
3283 arg += strlen(opt);
3284 if (*arg == '=') { /* sticked form: --option=value */
3285 *optarg = arg + 1;
3286 return 1;
3287 }
3288 if (*arg != '\0')
3289 return 0;
3290 /* separate form: --option value */
3291 if (!argv[1])
3292 die("Option '--%s' requires a value", opt);
3293 *optarg = argv[1];
3294 return 2;
3295}
3296static int stat_opt(struct diff_options *options, const char **av)
3298{
3299 const char *arg = av[0];
3300 char *end;
3301 int width = options->stat_width;
3302 int name_width = options->stat_name_width;
3303 int count = options->stat_count;
3304 int argcount = 1;
3305 arg += strlen("--stat");
3307 end = (char *)arg;
3308 switch (*arg) {
3310 case '-':
3311 if (!prefixcmp(arg, "-width")) {
3312 arg += strlen("-width");
3313 if (*arg == '=')
3314 width = strtoul(arg + 1, &end, 10);
3315 else if (!*arg && !av[1])
3316 die("Option '--stat-width' requires a value");
3317 else if (!*arg) {
3318 width = strtoul(av[1], &end, 10);
3319 argcount = 2;
3320 }
3321 } else if (!prefixcmp(arg, "-name-width")) {
3322 arg += strlen("-name-width");
3323 if (*arg == '=')
3324 name_width = strtoul(arg + 1, &end, 10);
3325 else if (!*arg && !av[1])
3326 die("Option '--stat-name-width' requires a value");
3327 else if (!*arg) {
3328 name_width = strtoul(av[1], &end, 10);
3329 argcount = 2;
3330 }
3331 } else if (!prefixcmp(arg, "-count")) {
3332 arg += strlen("-count");
3333 if (*arg == '=')
3334 count = strtoul(arg + 1, &end, 10);
3335 else if (!*arg && !av[1])
3336 die("Option '--stat-count' requires a value");
3337 else if (!*arg) {
3338 count = strtoul(av[1], &end, 10);
3339 argcount = 2;
3340 }
3341 }
3342 break;
3343 case '=':
3344 width = strtoul(arg+1, &end, 10);
3345 if (*end == ',')
3346 name_width = strtoul(end+1, &end, 10);
3347 if (*end == ',')
3348 count = strtoul(end+1, &end, 10);
3349 }
3350 /* Important! This checks all the error cases! */
3352 if (*end)
3353 return 0;
3354 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3355 options->stat_name_width = name_width;
3356 options->stat_width = width;
3357 options->stat_count = count;
3358 return argcount;
3359}
3360static int parse_dirstat_opt(struct diff_options *options, const char *params)
3362{
3363 struct strbuf errmsg = STRBUF_INIT;
3364 if (parse_dirstat_params(options, params, &errmsg))
3365 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3366 errmsg.buf);
3367 strbuf_release(&errmsg);
3368 /*
3369 * The caller knows a dirstat-related option is given from the command
3370 * line; allow it to say "return this_function();"
3371 */
3372 options->output_format |= DIFF_FORMAT_DIRSTAT;
3373 return 1;
3374}
3375int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3377{
3378 const char *arg = av[0];
3379 const char *optarg;
3380 int argcount;
3381 /* Output format options */
3383 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3384 options->output_format |= DIFF_FORMAT_PATCH;
3385 else if (opt_arg(arg, 'U', "unified", &options->context))
3386 options->output_format |= DIFF_FORMAT_PATCH;
3387 else if (!strcmp(arg, "--raw"))
3388 options->output_format |= DIFF_FORMAT_RAW;
3389 else if (!strcmp(arg, "--patch-with-raw"))
3390 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3391 else if (!strcmp(arg, "--numstat"))
3392 options->output_format |= DIFF_FORMAT_NUMSTAT;
3393 else if (!strcmp(arg, "--shortstat"))
3394 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3395 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3396 return parse_dirstat_opt(options, "");
3397 else if (!prefixcmp(arg, "-X"))
3398 return parse_dirstat_opt(options, arg + 2);
3399 else if (!prefixcmp(arg, "--dirstat="))
3400 return parse_dirstat_opt(options, arg + 10);
3401 else if (!strcmp(arg, "--cumulative"))
3402 return parse_dirstat_opt(options, "cumulative");
3403 else if (!strcmp(arg, "--dirstat-by-file"))
3404 return parse_dirstat_opt(options, "files");
3405 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3406 parse_dirstat_opt(options, "files");
3407 return parse_dirstat_opt(options, arg + 18);
3408 }
3409 else if (!strcmp(arg, "--check"))
3410 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3411 else if (!strcmp(arg, "--summary"))
3412 options->output_format |= DIFF_FORMAT_SUMMARY;
3413 else if (!strcmp(arg, "--patch-with-stat"))
3414 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3415 else if (!strcmp(arg, "--name-only"))
3416 options->output_format |= DIFF_FORMAT_NAME;
3417 else if (!strcmp(arg, "--name-status"))
3418 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3419 else if (!strcmp(arg, "-s"))
3420 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3421 else if (!prefixcmp(arg, "--stat"))
3422 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3423 return stat_opt(options, av);
3424 /* renames options */
3426 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3427 !strcmp(arg, "--break-rewrites")) {
3428 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3429 return error("invalid argument to -B: %s", arg+2);
3430 }
3431 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3432 !strcmp(arg, "--find-renames")) {
3433 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3434 return error("invalid argument to -M: %s", arg+2);
3435 options->detect_rename = DIFF_DETECT_RENAME;
3436 }
3437 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3438 options->irreversible_delete = 1;
3439 }
3440 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3441 !strcmp(arg, "--find-copies")) {
3442 if (options->detect_rename == DIFF_DETECT_COPY)
3443 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3444 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3445 return error("invalid argument to -C: %s", arg+2);
3446 options->detect_rename = DIFF_DETECT_COPY;
3447 }
3448 else if (!strcmp(arg, "--no-renames"))
3449 options->detect_rename = 0;
3450 else if (!strcmp(arg, "--relative"))
3451 DIFF_OPT_SET(options, RELATIVE_NAME);
3452 else if (!prefixcmp(arg, "--relative=")) {
3453 DIFF_OPT_SET(options, RELATIVE_NAME);
3454 options->prefix = arg + 11;
3455 }
3456 /* xdiff options */
3458 else if (!strcmp(arg, "--minimal"))
3459 DIFF_XDL_SET(options, NEED_MINIMAL);
3460 else if (!strcmp(arg, "--no-minimal"))
3461 DIFF_XDL_CLR(options, NEED_MINIMAL);
3462 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3463 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3464 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3465 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3466 else if (!strcmp(arg, "--ignore-space-at-eol"))
3467 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3468 else if (!strcmp(arg, "--patience"))
3469 DIFF_XDL_SET(options, PATIENCE_DIFF);
3470 else if (!strcmp(arg, "--histogram"))
3471 DIFF_XDL_SET(options, HISTOGRAM_DIFF);
3472 /* flags options */
3474 else if (!strcmp(arg, "--binary")) {
3475 options->output_format |= DIFF_FORMAT_PATCH;
3476 DIFF_OPT_SET(options, BINARY);
3477 }
3478 else if (!strcmp(arg, "--full-index"))
3479 DIFF_OPT_SET(options, FULL_INDEX);
3480 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3481 DIFF_OPT_SET(options, TEXT);
3482 else if (!strcmp(arg, "-R"))
3483 DIFF_OPT_SET(options, REVERSE_DIFF);
3484 else if (!strcmp(arg, "--find-copies-harder"))
3485 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3486 else if (!strcmp(arg, "--follow"))
3487 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3488 else if (!strcmp(arg, "--color"))
3489 options->use_color = 1;
3490 else if (!prefixcmp(arg, "--color=")) {
3491 int value = git_config_colorbool(NULL, arg+8);
3492 if (value < 0)
3493 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3494 options->use_color = value;
3495 }
3496 else if (!strcmp(arg, "--no-color"))
3497 options->use_color = 0;
3498 else if (!strcmp(arg, "--color-words")) {
3499 options->use_color = 1;
3500 options->word_diff = DIFF_WORDS_COLOR;
3501 }
3502 else if (!prefixcmp(arg, "--color-words=")) {
3503 options->use_color = 1;
3504 options->word_diff = DIFF_WORDS_COLOR;
3505 options->word_regex = arg + 14;
3506 }
3507 else if (!strcmp(arg, "--word-diff")) {
3508 if (options->word_diff == DIFF_WORDS_NONE)
3509 options->word_diff = DIFF_WORDS_PLAIN;
3510 }
3511 else if (!prefixcmp(arg, "--word-diff=")) {
3512 const char *type = arg + 12;
3513 if (!strcmp(type, "plain"))
3514 options->word_diff = DIFF_WORDS_PLAIN;
3515 else if (!strcmp(type, "color")) {
3516 options->use_color = 1;
3517 options->word_diff = DIFF_WORDS_COLOR;
3518 }
3519 else if (!strcmp(type, "porcelain"))
3520 options->word_diff = DIFF_WORDS_PORCELAIN;
3521 else if (!strcmp(type, "none"))
3522 options->word_diff = DIFF_WORDS_NONE;
3523 else
3524 die("bad --word-diff argument: %s", type);
3525 }
3526 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3527 if (options->word_diff == DIFF_WORDS_NONE)
3528 options->word_diff = DIFF_WORDS_PLAIN;
3529 options->word_regex = optarg;
3530 return argcount;
3531 }
3532 else if (!strcmp(arg, "--exit-code"))
3533 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3534 else if (!strcmp(arg, "--quiet"))
3535 DIFF_OPT_SET(options, QUICK);
3536 else if (!strcmp(arg, "--ext-diff"))
3537 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3538 else if (!strcmp(arg, "--no-ext-diff"))
3539 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3540 else if (!strcmp(arg, "--textconv"))
3541 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3542 else if (!strcmp(arg, "--no-textconv"))
3543 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3544 else if (!strcmp(arg, "--ignore-submodules")) {
3545 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3546 handle_ignore_submodules_arg(options, "all");
3547 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3548 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3549 handle_ignore_submodules_arg(options, arg + 20);
3550 } else if (!strcmp(arg, "--submodule"))
3551 DIFF_OPT_SET(options, SUBMODULE_LOG);
3552 else if (!prefixcmp(arg, "--submodule=")) {
3553 if (!strcmp(arg + 12, "log"))
3554 DIFF_OPT_SET(options, SUBMODULE_LOG);
3555 }
3556 /* misc options */
3558 else if (!strcmp(arg, "-z"))
3559 options->line_termination = 0;
3560 else if ((argcount = short_opt('l', av, &optarg))) {
3561 options->rename_limit = strtoul(optarg, NULL, 10);
3562 return argcount;
3563 }
3564 else if ((argcount = short_opt('S', av, &optarg))) {
3565 options->pickaxe = optarg;
3566 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3567 return argcount;
3568 } else if ((argcount = short_opt('G', av, &optarg))) {
3569 options->pickaxe = optarg;
3570 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3571 return argcount;
3572 }
3573 else if (!strcmp(arg, "--pickaxe-all"))
3574 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3575 else if (!strcmp(arg, "--pickaxe-regex"))
3576 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3577 else if ((argcount = short_opt('O', av, &optarg))) {
3578 options->orderfile = optarg;
3579 return argcount;
3580 }
3581 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3582 options->filter = optarg;
3583 return argcount;
3584 }
3585 else if (!strcmp(arg, "--abbrev"))
3586 options->abbrev = DEFAULT_ABBREV;
3587 else if (!prefixcmp(arg, "--abbrev=")) {
3588 options->abbrev = strtoul(arg + 9, NULL, 10);
3589 if (options->abbrev < MINIMUM_ABBREV)
3590 options->abbrev = MINIMUM_ABBREV;
3591 else if (40 < options->abbrev)
3592 options->abbrev = 40;
3593 }
3594 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3595 options->a_prefix = optarg;
3596 return argcount;
3597 }
3598 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3599 options->b_prefix = optarg;
3600 return argcount;
3601 }
3602 else if (!strcmp(arg, "--no-prefix"))
3603 options->a_prefix = options->b_prefix = "";
3604 else if (opt_arg(arg, '\0', "inter-hunk-context",
3605 &options->interhunkcontext))
3606 ;
3607 else if (!strcmp(arg, "-W"))
3608 DIFF_OPT_SET(options, FUNCCONTEXT);
3609 else if (!strcmp(arg, "--function-context"))
3610 DIFF_OPT_SET(options, FUNCCONTEXT);
3611 else if (!strcmp(arg, "--no-function-context"))
3612 DIFF_OPT_CLR(options, FUNCCONTEXT);
3613 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3614 options->file = fopen(optarg, "w");
3615 if (!options->file)
3616 die_errno("Could not open '%s'", optarg);
3617 options->close_file = 1;
3618 return argcount;
3619 } else
3620 return 0;
3621 return 1;
3622}
3623int parse_rename_score(const char **cp_p)
3625{
3626 unsigned long num, scale;
3627 int ch, dot;
3628 const char *cp = *cp_p;
3629 num = 0;
3631 scale = 1;
3632 dot = 0;
3633 for (;;) {
3634 ch = *cp;
3635 if ( !dot && ch == '.' ) {
3636 scale = 1;
3637 dot = 1;
3638 } else if ( ch == '%' ) {
3639 scale = dot ? scale*100 : 100;
3640 cp++; /* % is always at the end */
3641 break;
3642 } else if ( ch >= '0' && ch <= '9' ) {
3643 if ( scale < 100000 ) {
3644 scale *= 10;
3645 num = (num*10) + (ch-'0');
3646 }
3647 } else {
3648 break;
3649 }
3650 cp++;
3651 }
3652 *cp_p = cp;
3653 /* user says num divided by scale and we say internally that
3655 * is MAX_SCORE * num / scale.
3656 */
3657 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3658}
3659static int diff_scoreopt_parse(const char *opt)
3661{
3662 int opt1, opt2, cmd;
3663 if (*opt++ != '-')
3665 return -1;
3666 cmd = *opt++;
3667 if (cmd == '-') {
3668 /* convert the long-form arguments into short-form versions */
3669 if (!prefixcmp(opt, "break-rewrites")) {
3670 opt += strlen("break-rewrites");
3671 if (*opt == 0 || *opt++ == '=')
3672 cmd = 'B';
3673 } else if (!prefixcmp(opt, "find-copies")) {
3674 opt += strlen("find-copies");
3675 if (*opt == 0 || *opt++ == '=')
3676 cmd = 'C';
3677 } else if (!prefixcmp(opt, "find-renames")) {
3678 opt += strlen("find-renames");
3679 if (*opt == 0 || *opt++ == '=')
3680 cmd = 'M';
3681 }
3682 }
3683 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3684 return -1; /* that is not a -M, -C nor -B option */
3685 opt1 = parse_rename_score(&opt);
3687 if (cmd != 'B')
3688 opt2 = 0;
3689 else {
3690 if (*opt == 0)
3691 opt2 = 0;
3692 else if (*opt != '/')
3693 return -1; /* we expect -B80/99 or -B80 */
3694 else {
3695 opt++;
3696 opt2 = parse_rename_score(&opt);
3697 }
3698 }
3699 if (*opt != 0)
3700 return -1;
3701 return opt1 | (opt2 << 16);
3702}
3703struct diff_queue_struct diff_queued_diff;
3705void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3707{
3708 if (queue->alloc <= queue->nr) {
3709 queue->alloc = alloc_nr(queue->alloc);
3710 queue->queue = xrealloc(queue->queue,
3711 sizeof(dp) * queue->alloc);
3712 }
3713 queue->queue[queue->nr++] = dp;
3714}
3715struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3717 struct diff_filespec *one,
3718 struct diff_filespec *two)
3719{
3720 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3721 dp->one = one;
3722 dp->two = two;
3723 if (queue)
3724 diff_q(queue, dp);
3725 return dp;
3726}
3727void diff_free_filepair(struct diff_filepair *p)
3729{
3730 free_filespec(p->one);
3731 free_filespec(p->two);
3732 free(p);
3733}
3734/* This is different from find_unique_abbrev() in that
3736 * it stuffs the result with dots for alignment.
3737 */
3738const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3739{
3740 int abblen;
3741 const char *abbrev;
3742 if (len == 40)
3743 return sha1_to_hex(sha1);
3744 abbrev = find_unique_abbrev(sha1, len);
3746 abblen = strlen(abbrev);
3747 if (abblen < 37) {
3748 static char hex[41];
3749 if (len < abblen && abblen <= len + 2)
3750 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3751 else
3752 sprintf(hex, "%s...", abbrev);
3753 return hex;
3754 }
3755 return sha1_to_hex(sha1);
3756}
3757static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3759{
3760 int line_termination = opt->line_termination;
3761 int inter_name_termination = line_termination ? '\t' : '\0';
3762 if (opt->output_prefix) {
3763 struct strbuf *msg = NULL;
3764 msg = opt->output_prefix(opt, opt->output_prefix_data);
3765 fprintf(opt->file, "%s", msg->buf);
3766 }
3767 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3769 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3770 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3771 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3772 }
3773 if (p->score) {
3774 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3775 inter_name_termination);
3776 } else {
3777 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3778 }
3779 if (p->status == DIFF_STATUS_COPIED ||
3781 p->status == DIFF_STATUS_RENAMED) {
3782 const char *name_a, *name_b;
3783 name_a = p->one->path;
3784 name_b = p->two->path;
3785 strip_prefix(opt->prefix_length, &name_a, &name_b);
3786 write_name_quoted(name_a, opt->file, inter_name_termination);
3787 write_name_quoted(name_b, opt->file, line_termination);
3788 } else {
3789 const char *name_a, *name_b;
3790 name_a = p->one->mode ? p->one->path : p->two->path;
3791 name_b = NULL;
3792 strip_prefix(opt->prefix_length, &name_a, &name_b);
3793 write_name_quoted(name_a, opt->file, line_termination);
3794 }
3795}
3796int diff_unmodified_pair(struct diff_filepair *p)
3798{
3799 /* This function is written stricter than necessary to support
3800 * the currently implemented transformers, but the idea is to
3801 * let transformers to produce diff_filepairs any way they want,
3802 * and filter and clean them up here before producing the output.
3803 */
3804 struct diff_filespec *one = p->one, *two = p->two;
3805 if (DIFF_PAIR_UNMERGED(p))
3807 return 0; /* unmerged is interesting */
3808 /* deletion, addition, mode or type change
3810 * and rename are all interesting.
3811 */
3812 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3813 DIFF_PAIR_MODE_CHANGED(p) ||
3814 strcmp(one->path, two->path))
3815 return 0;
3816 /* both are valid and point at the same path. that is, we are
3818 * dealing with a change.
3819 */
3820 if (one->sha1_valid && two->sha1_valid &&
3821 !hashcmp(one->sha1, two->sha1) &&
3822 !one->dirty_submodule && !two->dirty_submodule)
3823 return 1; /* no change */
3824 if (!one->sha1_valid && !two->sha1_valid)
3825 return 1; /* both look at the same file on the filesystem. */
3826 return 0;
3827}
3828static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3830{
3831 if (diff_unmodified_pair(p))
3832 return;
3833 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3835 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3836 return; /* no tree diffs in patch format */
3837 run_diff(p, o);
3839}
3840static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3842 struct diffstat_t *diffstat)
3843{
3844 if (diff_unmodified_pair(p))
3845 return;
3846 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3848 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3849 return; /* no useful stat for tree diffs */
3850 run_diffstat(p, o, diffstat);
3852}
3853static void diff_flush_checkdiff(struct diff_filepair *p,
3855 struct diff_options *o)
3856{
3857 if (diff_unmodified_pair(p))
3858 return;
3859 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3861 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3862 return; /* nothing to check in tree diffs */
3863 run_checkdiff(p, o);
3865}
3866int diff_queue_is_empty(void)
3868{
3869 struct diff_queue_struct *q = &diff_queued_diff;
3870 int i;
3871 for (i = 0; i < q->nr; i++)
3872 if (!diff_unmodified_pair(q->queue[i]))
3873 return 0;
3874 return 1;
3875}
3876#if DIFF_DEBUG
3878void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3879{
3880 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3881 x, one ? one : "",
3882 s->path,
3883 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3884 s->mode,
3885 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3886 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3887 x, one ? one : "",
3888 s->size, s->xfrm_flags);
3889}
3890void diff_debug_filepair(const struct diff_filepair *p, int i)
3892{
3893 diff_debug_filespec(p->one, i, "one");
3894 diff_debug_filespec(p->two, i, "two");
3895 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3896 p->score, p->status ? p->status : '?',
3897 p->one->rename_used, p->broken_pair);
3898}
3899void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3901{
3902 int i;
3903 if (msg)
3904 fprintf(stderr, "%s\n", msg);
3905 fprintf(stderr, "q->nr = %d\n", q->nr);
3906 for (i = 0; i < q->nr; i++) {
3907 struct diff_filepair *p = q->queue[i];
3908 diff_debug_filepair(p, i);
3909 }
3910}
3911#endif
3912static void diff_resolve_rename_copy(void)
3914{
3915 int i;
3916 struct diff_filepair *p;
3917 struct diff_queue_struct *q = &diff_queued_diff;
3918 diff_debug_queue("resolve-rename-copy", q);
3920 for (i = 0; i < q->nr; i++) {
3922 p = q->queue[i];
3923 p->status = 0; /* undecided */
3924 if (DIFF_PAIR_UNMERGED(p))
3925 p->status = DIFF_STATUS_UNMERGED;
3926 else if (!DIFF_FILE_VALID(p->one))
3927 p->status = DIFF_STATUS_ADDED;
3928 else if (!DIFF_FILE_VALID(p->two))
3929 p->status = DIFF_STATUS_DELETED;
3930 else if (DIFF_PAIR_TYPE_CHANGED(p))
3931 p->status = DIFF_STATUS_TYPE_CHANGED;
3932 /* from this point on, we are dealing with a pair
3934 * whose both sides are valid and of the same type, i.e.
3935 * either in-place edit or rename/copy edit.
3936 */
3937 else if (DIFF_PAIR_RENAME(p)) {
3938 /*
3939 * A rename might have re-connected a broken
3940 * pair up, causing the pathnames to be the
3941 * same again. If so, that's not a rename at
3942 * all, just a modification..
3943 *
3944 * Otherwise, see if this source was used for
3945 * multiple renames, in which case we decrement
3946 * the count, and call it a copy.
3947 */
3948 if (!strcmp(p->one->path, p->two->path))
3949 p->status = DIFF_STATUS_MODIFIED;
3950 else if (--p->one->rename_used > 0)
3951 p->status = DIFF_STATUS_COPIED;
3952 else
3953 p->status = DIFF_STATUS_RENAMED;
3954 }
3955 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3956 p->one->mode != p->two->mode ||
3957 p->one->dirty_submodule ||
3958 p->two->dirty_submodule ||
3959 is_null_sha1(p->one->sha1))
3960 p->status = DIFF_STATUS_MODIFIED;
3961 else {
3962 /* This is a "no-change" entry and should not
3963 * happen anymore, but prepare for broken callers.
3964 */
3965 error("feeding unmodified %s to diffcore",
3966 p->one->path);
3967 p->status = DIFF_STATUS_UNKNOWN;
3968 }
3969 }
3970 diff_debug_queue("resolve-rename-copy done", q);
3971}
3972static int check_pair_status(struct diff_filepair *p)
3974{
3975 switch (p->status) {
3976 case DIFF_STATUS_UNKNOWN:
3977 return 0;
3978 case 0:
3979 die("internal error in diff-resolve-rename-copy");
3980 default:
3981 return 1;
3982 }
3983}
3984static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3986{
3987 int fmt = opt->output_format;
3988 if (fmt & DIFF_FORMAT_CHECKDIFF)
3990 diff_flush_checkdiff(p, opt);
3991 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3992 diff_flush_raw(p, opt);
3993 else if (fmt & DIFF_FORMAT_NAME) {
3994 const char *name_a, *name_b;
3995 name_a = p->two->path;
3996 name_b = NULL;
3997 strip_prefix(opt->prefix_length, &name_a, &name_b);
3998 write_name_quoted(name_a, opt->file, opt->line_termination);
3999 }
4000}
4001static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4003{
4004 if (fs->mode)
4005 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4006 else
4007 fprintf(file, " %s ", newdelete);
4008 write_name_quoted(fs->path, file, '\n');
4009}
4010static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4013 const char *line_prefix)
4014{
4015 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4016 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4017 p->two->mode, show_name ? ' ' : '\n');
4018 if (show_name) {
4019 write_name_quoted(p->two->path, file, '\n');
4020 }
4021 }
4022}
4023static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4025 const char *line_prefix)
4026{
4027 char *names = pprint_rename(p->one->path, p->two->path);
4028 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4030 free(names);
4031 show_mode_change(file, p, 0, line_prefix);
4032}
4033static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4035{
4036 FILE *file = opt->file;
4037 char *line_prefix = "";
4038 if (opt->output_prefix) {
4040 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4041 line_prefix = buf->buf;
4042 }
4043 switch(p->status) {
4045 case DIFF_STATUS_DELETED:
4046 fputs(line_prefix, file);
4047 show_file_mode_name(file, "delete", p->one);
4048 break;
4049 case DIFF_STATUS_ADDED:
4050 fputs(line_prefix, file);
4051 show_file_mode_name(file, "create", p->two);
4052 break;
4053 case DIFF_STATUS_COPIED:
4054 fputs(line_prefix, file);
4055 show_rename_copy(file, "copy", p, line_prefix);
4056 break;
4057 case DIFF_STATUS_RENAMED:
4058 fputs(line_prefix, file);
4059 show_rename_copy(file, "rename", p, line_prefix);
4060 break;
4061 default:
4062 if (p->score) {
4063 fprintf(file, "%s rewrite ", line_prefix);
4064 write_name_quoted(p->two->path, file, ' ');
4065 fprintf(file, "(%d%%)\n", similarity_index(p));
4066 }
4067 show_mode_change(file, p, !p->score, line_prefix);
4068 break;
4069 }
4070}
4071struct patch_id_t {
4073 git_SHA_CTX *ctx;
4074 int patchlen;
4075};
4076static int remove_space(char *line, int len)
4078{
4079 int i;
4080 char *dst = line;
4081 unsigned char c;
4082 for (i = 0; i < len; i++)
4084 if (!isspace((c = line[i])))
4085 *dst++ = c;
4086 return dst - line;
4088}
4089static void patch_id_consume(void *priv, char *line, unsigned long len)
4091{
4092 struct patch_id_t *data = priv;
4093 int new_len;
4094 /* Ignore line numbers when computing the SHA1 of the patch */
4096 if (!prefixcmp(line, "@@ -"))
4097 return;
4098 new_len = remove_space(line, len);
4100 git_SHA1_Update(data->ctx, line, new_len);
4102 data->patchlen += new_len;
4103}
4104/* returns 0 upon success, and writes result into sha1 */
4106static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4107{
4108 struct diff_queue_struct *q = &diff_queued_diff;
4109 int i;
4110 git_SHA_CTX ctx;
4111 struct patch_id_t data;
4112 char buffer[PATH_MAX * 4 + 20];
4113 git_SHA1_Init(&ctx);
4115 memset(&data, 0, sizeof(struct patch_id_t));
4116 data.ctx = &ctx;
4117 for (i = 0; i < q->nr; i++) {
4119 xpparam_t xpp;
4120 xdemitconf_t xecfg;
4121 mmfile_t mf1, mf2;
4122 struct diff_filepair *p = q->queue[i];
4123 int len1, len2;
4124 memset(&xpp, 0, sizeof(xpp));
4126 memset(&xecfg, 0, sizeof(xecfg));
4127 if (p->status == 0)
4128 return error("internal diff status error");
4129 if (p->status == DIFF_STATUS_UNKNOWN)
4130 continue;
4131 if (diff_unmodified_pair(p))
4132 continue;
4133 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4134 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4135 continue;
4136 if (DIFF_PAIR_UNMERGED(p))
4137 continue;
4138 diff_fill_sha1_info(p->one);
4140 diff_fill_sha1_info(p->two);
4141 if (fill_mmfile(&mf1, p->one) < 0 ||
4142 fill_mmfile(&mf2, p->two) < 0)
4143 return error("unable to read files to diff");
4144 len1 = remove_space(p->one->path, strlen(p->one->path));
4146 len2 = remove_space(p->two->path, strlen(p->two->path));
4147 if (p->one->mode == 0)
4148 len1 = snprintf(buffer, sizeof(buffer),
4149 "diff--gita/%.*sb/%.*s"
4150 "newfilemode%06o"
4151 "---/dev/null"
4152 "+++b/%.*s",
4153 len1, p->one->path,
4154 len2, p->two->path,
4155 p->two->mode,
4156 len2, p->two->path);
4157 else if (p->two->mode == 0)
4158 len1 = snprintf(buffer, sizeof(buffer),
4159 "diff--gita/%.*sb/%.*s"
4160 "deletedfilemode%06o"
4161 "---a/%.*s"
4162 "+++/dev/null",
4163 len1, p->one->path,
4164 len2, p->two->path,
4165 p->one->mode,
4166 len1, p->one->path);
4167 else
4168 len1 = snprintf(buffer, sizeof(buffer),
4169 "diff--gita/%.*sb/%.*s"
4170 "---a/%.*s"
4171 "+++b/%.*s",
4172 len1, p->one->path,
4173 len2, p->two->path,
4174 len1, p->one->path,
4175 len2, p->two->path);
4176 git_SHA1_Update(&ctx, buffer, len1);
4177 if (diff_filespec_is_binary(p->one) ||
4179 diff_filespec_is_binary(p->two)) {
4180 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4181 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4182 continue;
4183 }
4184 xpp.flags = 0;
4186 xecfg.ctxlen = 3;
4187 xecfg.flags = 0;
4188 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4189 &xpp, &xecfg);
4190 }
4191 git_SHA1_Final(sha1, &ctx);
4193 return 0;
4194}
4195int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4197{
4198 struct diff_queue_struct *q = &diff_queued_diff;
4199 int i;
4200 int result = diff_get_patch_id(options, sha1);
4201 for (i = 0; i < q->nr; i++)
4203 diff_free_filepair(q->queue[i]);
4204 free(q->queue);
4206 DIFF_QUEUE_CLEAR(q);
4207 return result;
4209}
4210static int is_summary_empty(const struct diff_queue_struct *q)
4212{
4213 int i;
4214 for (i = 0; i < q->nr; i++) {
4216 const struct diff_filepair *p = q->queue[i];
4217 switch (p->status) {
4219 case DIFF_STATUS_DELETED:
4220 case DIFF_STATUS_ADDED:
4221 case DIFF_STATUS_COPIED:
4222 case DIFF_STATUS_RENAMED:
4223 return 0;
4224 default:
4225 if (p->score)
4226 return 0;
4227 if (p->one->mode && p->two->mode &&
4228 p->one->mode != p->two->mode)
4229 return 0;
4230 break;
4231 }
4232 }
4233 return 1;
4234}
4235static const char rename_limit_warning[] =
4237"inexact rename detection was skipped due to too many files.";
4238static const char degrade_cc_to_c_warning[] =
4240"only found copies from modified paths due to too many files.";
4241static const char rename_limit_advice[] =
4243"you may want to set your %s variable to at least "
4244"%d and retry the command.";
4245void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4247{
4248 if (degraded_cc)
4249 warning(degrade_cc_to_c_warning);
4250 else if (needed)
4251 warning(rename_limit_warning);
4252 else
4253 return;
4254 if (0 < needed && needed < 32767)
4255 warning(rename_limit_advice, varname, needed);
4256}
4257void diff_flush(struct diff_options *options)
4259{
4260 struct diff_queue_struct *q = &diff_queued_diff;
4261 int i, output_format = options->output_format;
4262 int separator = 0;
4263 int dirstat_by_line = 0;
4264 /*
4266 * Order: raw, stat, summary, patch
4267 * or: name/name-status/checkdiff (other bits clear)
4268 */
4269 if (!q->nr)
4270 goto free_queue;
4271 if (output_format & (DIFF_FORMAT_RAW |
4273 DIFF_FORMAT_NAME |
4274 DIFF_FORMAT_NAME_STATUS |
4275 DIFF_FORMAT_CHECKDIFF)) {
4276 for (i = 0; i < q->nr; i++) {
4277 struct diff_filepair *p = q->queue[i];
4278 if (check_pair_status(p))
4279 flush_one_pair(p, options);
4280 }
4281 separator++;
4282 }
4283 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4285 dirstat_by_line = 1;
4286 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4288 dirstat_by_line) {
4289 struct diffstat_t diffstat;
4290 memset(&diffstat, 0, sizeof(struct diffstat_t));
4292 for (i = 0; i < q->nr; i++) {
4293 struct diff_filepair *p = q->queue[i];
4294 if (check_pair_status(p))
4295 diff_flush_stat(p, options, &diffstat);
4296 }
4297 if (output_format & DIFF_FORMAT_NUMSTAT)
4298 show_numstat(&diffstat, options);
4299 if (output_format & DIFF_FORMAT_DIFFSTAT)
4300 show_stats(&diffstat, options);
4301 if (output_format & DIFF_FORMAT_SHORTSTAT)
4302 show_shortstats(&diffstat, options);
4303 if (output_format & DIFF_FORMAT_DIRSTAT)
4304 show_dirstat_by_line(&diffstat, options);
4305 free_diffstat_info(&diffstat);
4306 separator++;
4307 }
4308 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4309 show_dirstat(options);
4310 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4312 for (i = 0; i < q->nr; i++) {
4313 diff_summary(options, q->queue[i]);
4314 }
4315 separator++;
4316 }
4317 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4319 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4320 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4321 /*
4322 * run diff_flush_patch for the exit status. setting
4323 * options->file to /dev/null should be safe, becaue we
4324 * aren't supposed to produce any output anyway.
4325 */
4326 if (options->close_file)
4327 fclose(options->file);
4328 options->file = fopen("/dev/null", "w");
4329 if (!options->file)
4330 die_errno("Could not open /dev/null");
4331 options->close_file = 1;
4332 for (i = 0; i < q->nr; i++) {
4333 struct diff_filepair *p = q->queue[i];
4334 if (check_pair_status(p))
4335 diff_flush_patch(p, options);
4336 if (options->found_changes)
4337 break;
4338 }
4339 }
4340 if (output_format & DIFF_FORMAT_PATCH) {
4342 if (separator) {
4343 putc(options->line_termination, options->file);
4344 if (options->stat_sep) {
4345 /* attach patch instead of inline */
4346 fputs(options->stat_sep, options->file);
4347 }
4348 }
4349 for (i = 0; i < q->nr; i++) {
4351 struct diff_filepair *p = q->queue[i];
4352 if (check_pair_status(p))
4353 diff_flush_patch(p, options);
4354 }
4355 }
4356 if (output_format & DIFF_FORMAT_CALLBACK)
4358 options->format_callback(q, options, options->format_callback_data);
4359 for (i = 0; i < q->nr; i++)
4361 diff_free_filepair(q->queue[i]);
4362free_queue:
4363 free(q->queue);
4364 DIFF_QUEUE_CLEAR(q);
4365 if (options->close_file)
4366 fclose(options->file);
4367 /*
4369 * Report the content-level differences with HAS_CHANGES;
4370 * diff_addremove/diff_change does not set the bit when
4371 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4372 */
4373 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4374 if (options->found_changes)
4375 DIFF_OPT_SET(options, HAS_CHANGES);
4376 else
4377 DIFF_OPT_CLR(options, HAS_CHANGES);
4378 }
4379}
4380static void diffcore_apply_filter(const char *filter)
4382{
4383 int i;
4384 struct diff_queue_struct *q = &diff_queued_diff;
4385 struct diff_queue_struct outq;
4386 DIFF_QUEUE_CLEAR(&outq);
4387 if (!filter)
4389 return;
4390 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4392 int found;
4393 for (i = found = 0; !found && i < q->nr; i++) {
4394 struct diff_filepair *p = q->queue[i];
4395 if (((p->status == DIFF_STATUS_MODIFIED) &&
4396 ((p->score &&
4397 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4398 (!p->score &&
4399 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4400 ((p->status != DIFF_STATUS_MODIFIED) &&
4401 strchr(filter, p->status)))
4402 found++;
4403 }
4404 if (found)
4405 return;
4406 /* otherwise we will clear the whole queue
4408 * by copying the empty outq at the end of this
4409 * function, but first clear the current entries
4410 * in the queue.
4411 */
4412 for (i = 0; i < q->nr; i++)
4413 diff_free_filepair(q->queue[i]);
4414 }
4415 else {
4416 /* Only the matching ones */
4417 for (i = 0; i < q->nr; i++) {
4418 struct diff_filepair *p = q->queue[i];
4419 if (((p->status == DIFF_STATUS_MODIFIED) &&
4421 ((p->score &&
4422 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4423 (!p->score &&
4424 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4425 ((p->status != DIFF_STATUS_MODIFIED) &&
4426 strchr(filter, p->status)))
4427 diff_q(&outq, p);
4428 else
4429 diff_free_filepair(p);
4430 }
4431 }
4432 free(q->queue);
4433 *q = outq;
4434}
4435/* Check whether two filespecs with the same mode and size are identical */
4437static int diff_filespec_is_identical(struct diff_filespec *one,
4438 struct diff_filespec *two)
4439{
4440 if (S_ISGITLINK(one->mode))
4441 return 0;
4442 if (diff_populate_filespec(one, 0))
4443 return 0;
4444 if (diff_populate_filespec(two, 0))
4445 return 0;
4446 return !memcmp(one->data, two->data, one->size);
4447}
4448static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4450{
4451 int i;
4452 struct diff_queue_struct *q = &diff_queued_diff;
4453 struct diff_queue_struct outq;
4454 DIFF_QUEUE_CLEAR(&outq);
4455 for (i = 0; i < q->nr; i++) {
4457 struct diff_filepair *p = q->queue[i];
4458 /*
4460 * 1. Entries that come from stat info dirtiness
4461 * always have both sides (iow, not create/delete),
4462 * one side of the object name is unknown, with
4463 * the same mode and size. Keep the ones that
4464 * do not match these criteria. They have real
4465 * differences.
4466 *
4467 * 2. At this point, the file is known to be modified,
4468 * with the same mode and size, and the object
4469 * name of one side is unknown. Need to inspect
4470 * the identical contents.
4471 */
4472 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4473 !DIFF_FILE_VALID(p->two) ||
4474 (p->one->sha1_valid && p->two->sha1_valid) ||
4475 (p->one->mode != p->two->mode) ||
4476 diff_populate_filespec(p->one, 1) ||
4477 diff_populate_filespec(p->two, 1) ||
4478 (p->one->size != p->two->size) ||
4479 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4480 diff_q(&outq, p);
4481 else {
4482 /*
4483 * The caller can subtract 1 from skip_stat_unmatch
4484 * to determine how many paths were dirty only
4485 * due to stat info mismatch.
4486 */
4487 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4488 diffopt->skip_stat_unmatch++;
4489 diff_free_filepair(p);
4490 }
4491 }
4492 free(q->queue);
4493 *q = outq;
4494}
4495static int diffnamecmp(const void *a_, const void *b_)
4497{
4498 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4499 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4500 const char *name_a, *name_b;
4501 name_a = a->one ? a->one->path : a->two->path;
4503 name_b = b->one ? b->one->path : b->two->path;
4504 return strcmp(name_a, name_b);
4505}
4506void diffcore_fix_diff_index(struct diff_options *options)
4508{
4509 struct diff_queue_struct *q = &diff_queued_diff;
4510 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4511}
4512void diffcore_std(struct diff_options *options)
4514{
4515 if (options->skip_stat_unmatch)
4516 diffcore_skip_stat_unmatch(options);
4517 if (!options->found_follow) {
4518 /* See try_to_follow_renames() in tree-diff.c */
4519 if (options->break_opt != -1)
4520 diffcore_break(options->break_opt);
4521 if (options->detect_rename)
4522 diffcore_rename(options);
4523 if (options->break_opt != -1)
4524 diffcore_merge_broken();
4525 }
4526 if (options->pickaxe)
4527 diffcore_pickaxe(options);
4528 if (options->orderfile)
4529 diffcore_order(options->orderfile);
4530 if (!options->found_follow)
4531 /* See try_to_follow_renames() in tree-diff.c */
4532 diff_resolve_rename_copy();
4533 diffcore_apply_filter(options->filter);
4534 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4536 DIFF_OPT_SET(options, HAS_CHANGES);
4537 else
4538 DIFF_OPT_CLR(options, HAS_CHANGES);
4539 options->found_follow = 0;
4541}
4542int diff_result_code(struct diff_options *opt, int status)
4544{
4545 int result = 0;
4546 diff_warn_rename_limit("diff.renamelimit",
4548 opt->needed_rename_limit,
4549 opt->degraded_cc_to_c);
4550 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4551 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4552 return status;
4553 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4554 DIFF_OPT_TST(opt, HAS_CHANGES))
4555 result |= 01;
4556 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4557 DIFF_OPT_TST(opt, CHECK_FAILED))
4558 result |= 02;
4559 return result;
4560}
4561int diff_can_quit_early(struct diff_options *opt)
4563{
4564 return (DIFF_OPT_TST(opt, QUICK) &&
4565 !opt->filter &&
4566 DIFF_OPT_TST(opt, HAS_CHANGES));
4567}
4568/*
4570 * Shall changes to this submodule be ignored?
4571 *
4572 * Submodule changes can be configured to be ignored separately for each path,
4573 * but that configuration can be overridden from the command line.
4574 */
4575static int is_submodule_ignored(const char *path, struct diff_options *options)
4576{
4577 int ignored = 0;
4578 unsigned orig_flags = options->flags;
4579 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4580 set_diffopt_flags_from_submodule_config(options, path);
4581 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4582 ignored = 1;
4583 options->flags = orig_flags;
4584 return ignored;
4585}
4586void diff_addremove(struct diff_options *options,
4588 int addremove, unsigned mode,
4589 const unsigned char *sha1,
4590 const char *concatpath, unsigned dirty_submodule)
4591{
4592 struct diff_filespec *one, *two;
4593 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4595 return;
4596 /* This may look odd, but it is a preparation for
4598 * feeding "there are unchanged files which should
4599 * not produce diffs, but when you are doing copy
4600 * detection you would need them, so here they are"
4601 * entries to the diff-core. They will be prefixed
4602 * with something like '=' or '*' (I haven't decided
4603 * which but should not make any difference).
4604 * Feeding the same new and old to diff_change()
4605 * also has the same effect.
4606 * Before the final output happens, they are pruned after
4607 * merged into rename/copy pairs as appropriate.
4608 */
4609 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4610 addremove = (addremove == '+' ? '-' :
4611 addremove == '-' ? '+' : addremove);
4612 if (options->prefix &&
4614 strncmp(concatpath, options->prefix, options->prefix_length))
4615 return;
4616 one = alloc_filespec(concatpath);
4618 two = alloc_filespec(concatpath);
4619 if (addremove != '+')
4621 fill_filespec(one, sha1, mode);
4622 if (addremove != '-') {
4623 fill_filespec(two, sha1, mode);
4624 two->dirty_submodule = dirty_submodule;
4625 }
4626 diff_queue(&diff_queued_diff, one, two);
4628 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4629 DIFF_OPT_SET(options, HAS_CHANGES);
4630}
4631void diff_change(struct diff_options *options,
4633 unsigned old_mode, unsigned new_mode,
4634 const unsigned char *old_sha1,
4635 const unsigned char *new_sha1,
4636 const char *concatpath,
4637 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4638{
4639 struct diff_filespec *one, *two;
4640 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4642 is_submodule_ignored(concatpath, options))
4643 return;
4644 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4646 unsigned tmp;
4647 const unsigned char *tmp_c;
4648 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4649 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4650 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4651 new_dirty_submodule = tmp;
4652 }
4653 if (options->prefix &&
4655 strncmp(concatpath, options->prefix, options->prefix_length))
4656 return;
4657 one = alloc_filespec(concatpath);
4659 two = alloc_filespec(concatpath);
4660 fill_filespec(one, old_sha1, old_mode);
4661 fill_filespec(two, new_sha1, new_mode);
4662 one->dirty_submodule = old_dirty_submodule;
4663 two->dirty_submodule = new_dirty_submodule;
4664 diff_queue(&diff_queued_diff, one, two);
4666 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4667 DIFF_OPT_SET(options, HAS_CHANGES);
4668}
4669struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4671{
4672 struct diff_filepair *pair;
4673 struct diff_filespec *one, *two;
4674 if (options->prefix &&
4676 strncmp(path, options->prefix, options->prefix_length))
4677 return NULL;
4678 one = alloc_filespec(path);
4680 two = alloc_filespec(path);
4681 pair = diff_queue(&diff_queued_diff, one, two);
4682 pair->is_unmerged = 1;
4683 return pair;
4684}
4685static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4687 size_t *outsize)
4688{
4689 struct diff_tempfile *temp;
4690 const char *argv[3];
4691 const char **arg = argv;
4692 struct child_process child;
4693 struct strbuf buf = STRBUF_INIT;
4694 int err = 0;
4695 temp = prepare_temp_file(spec->path, spec);
4697 *arg++ = pgm;
4698 *arg++ = temp->name;
4699 *arg = NULL;
4700 memset(&child, 0, sizeof(child));
4702 child.use_shell = 1;
4703 child.argv = argv;
4704 child.out = -1;
4705 if (start_command(&child)) {
4706 remove_tempfile();
4707 return NULL;
4708 }
4709 if (strbuf_read(&buf, child.out, 0) < 0)
4711 err = error("error reading from textconv command '%s'", pgm);
4712 close(child.out);
4713 if (finish_command(&child) || err) {
4715 strbuf_release(&buf);
4716 remove_tempfile();
4717 return NULL;
4718 }
4719 remove_tempfile();
4720 return strbuf_detach(&buf, outsize);
4722}
4723size_t fill_textconv(struct userdiff_driver *driver,
4725 struct diff_filespec *df,
4726 char **outbuf)
4727{
4728 size_t size;
4729 if (!driver || !driver->textconv) {
4731 if (!DIFF_FILE_VALID(df)) {
4732 *outbuf = "";
4733 return 0;
4734 }
4735 if (diff_populate_filespec(df, 0))
4736 die("unable to read files to diff");
4737 *outbuf = df->data;
4738 return df->size;
4739 }
4740 if (driver->textconv_cache && df->sha1_valid) {
4742 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4743 &size);
4744 if (*outbuf)
4745 return size;
4746 }
4747 *outbuf = run_textconv(driver->textconv, df, &size);
4749 if (!*outbuf)
4750 die("unable to read files to diff");
4751 if (driver->textconv_cache && df->sha1_valid) {
4753 /* ignore errors, as we might be in a readonly repository */
4754 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4755 size);
4756 /*
4757 * we could save up changes and flush them all at the end,
4758 * but we would need an extra call after all diffing is done.
4759 * Since generating a cache entry is the slow path anyway,
4760 * this extra overhead probably isn't a big deal.
4761 */
4762 notes_cache_write(driver->textconv_cache);
4763 }
4764 return size;
4766}