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1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 400;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33 static int diff_no_prefix;
34 static int diff_dirstat_permille_default = 30;
35 static struct diff_options default_diff_options;
37 static 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 };
49 static 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 }
70 static 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;
76 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 }
114 p += p_len;
116 if (*p)
117 p++; /* more parameters, swallow separator */
118 }
119 return ret;
120 }
122 static 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 }
131 /*
132 * These are to give UI layer defaults.
133 * The core-level commands such as git-diff-files should
134 * never be affected by the setting of diff.renames
135 * the user happens to have in the configuration file.
136 */
137 int git_diff_ui_config(const char *var, const char *value, void *cb)
138 {
139 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
140 diff_use_color_default = git_config_colorbool(var, value);
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);
164 if (!strcmp(var, "diff.ignoresubmodules"))
165 handle_ignore_submodules_arg(&default_diff_options, value);
167 if (git_color_config(var, value, cb) < 0)
168 return -1;
170 return git_diff_basic_config(var, value, cb);
171 }
173 int 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 }
180 switch (userdiff_config(var, value)) {
181 case 0: break;
182 case -1: return -1;
183 default: return 0;
184 }
186 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 }
196 /* 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 }
204 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 }
215 if (!prefixcmp(var, "submodule."))
216 return parse_submodule_config_option(var, value);
218 return git_default_config(var, value, cb);
219 }
221 static 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;
227 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 }
239 static const char *external_diff(void)
240 {
241 static const char *external_diff_cmd = NULL;
242 static int done_preparing = 0;
244 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 }
253 static 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];
260 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
262 struct 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 };
277 static 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 }
300 static 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;
310 mf->ptr = one->data;
311 mf->size = one->size;
312 return 0;
313 }
315 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
316 static 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 }
324 static 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;
330 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 }
350 static 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;
365 at = count_lines(mf2->ptr, mf2->size);
366 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
367 }
369 static 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;
376 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 }
383 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 }
398 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 }
411 static 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 }
417 static 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 }
428 static 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);
435 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 }
448 static 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;
461 /*
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 @@ */
473 /* 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));
478 /*
479 * trailing "\r\n"
480 */
481 for ( ; i < 3; i++)
482 if (line[len - i] == '\r' || line[len - i] == '\n')
483 len--;
485 /* 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 }
495 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 }
501 strbuf_add(&msgbuf, line + len, org_len - len);
502 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
503 strbuf_release(&msgbuf);
504 }
506 static 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 }
514 static int remove_tempfile_installed;
516 static 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 }
526 static void remove_tempfile_on_signal(int signo)
527 {
528 remove_tempfile();
529 sigchain_pop(signo);
530 raise(signo);
531 }
533 static 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 }
548 static 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);
556 while (0 < size) {
557 int len;
559 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 }
580 static 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;
601 if (o && o->output_prefix) {
602 msgbuf = o->output_prefix(o, o->output_prefix_data);
603 line_prefix = msgbuf->buf;
604 }
606 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 }
614 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" : "";
619 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);
624 size_one = fill_textconv(textconv_one, one, &data_one);
625 size_two = fill_textconv(textconv_two, two, &data_two);
627 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;
643 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 }
667 struct 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 };
676 static 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 }
687 struct 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 };
694 struct diff_words_style {
695 enum diff_words_type type;
696 struct diff_words_style_elem new, old, ctx;
697 const char *newline;
698 };
700 static 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 };
706 struct 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 };
716 static 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;
724 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 }
750 /*
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 */
781 static 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 }
793 static 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 = "";
803 if (line[0] != '@' || parse_hunk_header(line, len,
804 &minus_first, &minus_len, &plus_first, &plus_len))
805 return;
807 assert(opt);
808 if (opt->output_prefix) {
809 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
810 line_prefix = msgbuf->buf;
811 }
813 /* 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;
822 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;
828 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 }
852 diff_words->current_plus = plus_end;
853 diff_words->last_minus = minus_first;
854 }
856 /* This function starts looking at *begin, and returns 0 iff a word was found. */
857 static 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 }
872 /* find the next word */
873 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
874 (*begin)++;
875 if (*begin >= buffer->size)
876 return -1;
878 /* find the end of the word */
879 *end = *begin + 1;
880 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
881 (*end)++;
883 return 0;
884 }
886 /*
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 */
891 static 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;
897 out->size = 0;
898 out->ptr = NULL;
900 /* 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;
905 for (i = 0; i < buffer->text.size; i++) {
906 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
907 return;
909 /* 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++;
916 /* 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;
922 i = j - 1;
923 }
924 }
926 /* this executes the word diff on the accumulated buffers */
927 static 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;
934 struct diff_options *opt = diff_words->opt;
935 struct strbuf *msgbuf;
936 char *line_prefix = "";
938 assert(opt);
939 if (opt->output_prefix) {
940 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
941 line_prefix = msgbuf->buf;
942 }
944 /* 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 }
955 diff_words->current_plus = diff_words->plus.text.ptr;
956 diff_words->last_minus = 0;
958 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 }
982 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
983 static 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 }
990 static void diff_filespec_load_driver(struct diff_filespec *one)
991 {
992 /* Use already-loaded driver */
993 if (one->driver)
994 return;
996 if (S_ISREG(one->mode))
997 one->driver = userdiff_find_by_path(one->path);
999 /* Fallback to default settings */
1000 if (!one->driver)
1001 one->driver = userdiff_find_by_name("default");
1002 }
1004 static const char *userdiff_word_regex(struct diff_filespec *one)
1005 {
1006 diff_filespec_load_driver(one);
1007 return one->driver->word_regex;
1008 }
1010 static void init_diff_words_data(struct emit_callback *ecbdata,
1011 struct diff_options *orig_opts,
1012 struct diff_filespec *one,
1013 struct diff_filespec *two)
1014 {
1015 int i;
1016 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1017 memcpy(o, orig_opts, sizeof(struct diff_options));
1019 ecbdata->diff_words =
1020 xcalloc(1, sizeof(struct diff_words_data));
1021 ecbdata->diff_words->type = o->word_diff;
1022 ecbdata->diff_words->opt = o;
1023 if (!o->word_regex)
1024 o->word_regex = userdiff_word_regex(one);
1025 if (!o->word_regex)
1026 o->word_regex = userdiff_word_regex(two);
1027 if (!o->word_regex)
1028 o->word_regex = diff_word_regex_cfg;
1029 if (o->word_regex) {
1030 ecbdata->diff_words->word_regex = (regex_t *)
1031 xmalloc(sizeof(regex_t));
1032 if (regcomp(ecbdata->diff_words->word_regex,
1033 o->word_regex,
1034 REG_EXTENDED | REG_NEWLINE))
1035 die ("Invalid regular expression: %s",
1036 o->word_regex);
1037 }
1038 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1039 if (o->word_diff == diff_words_styles[i].type) {
1040 ecbdata->diff_words->style =
1041 &diff_words_styles[i];
1042 break;
1043 }
1044 }
1045 if (want_color(o->use_color)) {
1046 struct diff_words_style *st = ecbdata->diff_words->style;
1047 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1048 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1049 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1050 }
1051 }
1053 static void free_diff_words_data(struct emit_callback *ecbdata)
1054 {
1055 if (ecbdata->diff_words) {
1056 diff_words_flush(ecbdata);
1057 free (ecbdata->diff_words->opt);
1058 free (ecbdata->diff_words->minus.text.ptr);
1059 free (ecbdata->diff_words->minus.orig);
1060 free (ecbdata->diff_words->plus.text.ptr);
1061 free (ecbdata->diff_words->plus.orig);
1062 if (ecbdata->diff_words->word_regex) {
1063 regfree(ecbdata->diff_words->word_regex);
1064 free(ecbdata->diff_words->word_regex);
1065 }
1066 free(ecbdata->diff_words);
1067 ecbdata->diff_words = NULL;
1068 }
1069 }
1071 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1072 {
1073 if (want_color(diff_use_color))
1074 return diff_colors[ix];
1075 return "";
1076 }
1078 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1079 {
1080 const char *cp;
1081 unsigned long allot;
1082 size_t l = len;
1084 if (ecb->truncate)
1085 return ecb->truncate(line, len);
1086 cp = line;
1087 allot = l;
1088 while (0 < l) {
1089 (void) utf8_width(&cp, &l);
1090 if (!cp)
1091 break; /* truncated in the middle? */
1092 }
1093 return allot - l;
1094 }
1096 static void find_lno(const char *line, struct emit_callback *ecbdata)
1097 {
1098 const char *p;
1099 ecbdata->lno_in_preimage = 0;
1100 ecbdata->lno_in_postimage = 0;
1101 p = strchr(line, '-');
1102 if (!p)
1103 return; /* cannot happen */
1104 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1105 p = strchr(p, '+');
1106 if (!p)
1107 return; /* cannot happen */
1108 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1109 }
1111 static void fn_out_consume(void *priv, char *line, unsigned long len)
1112 {
1113 struct emit_callback *ecbdata = priv;
1114 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1115 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1116 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1117 struct diff_options *o = ecbdata->opt;
1118 char *line_prefix = "";
1119 struct strbuf *msgbuf;
1121 if (o && o->output_prefix) {
1122 msgbuf = o->output_prefix(o, o->output_prefix_data);
1123 line_prefix = msgbuf->buf;
1124 }
1126 if (ecbdata->header) {
1127 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1128 strbuf_reset(ecbdata->header);
1129 ecbdata->header = NULL;
1130 }
1131 *(ecbdata->found_changesp) = 1;
1133 if (ecbdata->label_path[0]) {
1134 const char *name_a_tab, *name_b_tab;
1136 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1137 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1139 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1140 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1141 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1142 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1143 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1144 }
1146 if (diff_suppress_blank_empty
1147 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1148 line[0] = '\n';
1149 len = 1;
1150 }
1152 if (line[0] == '@') {
1153 if (ecbdata->diff_words)
1154 diff_words_flush(ecbdata);
1155 len = sane_truncate_line(ecbdata, line, len);
1156 find_lno(line, ecbdata);
1157 emit_hunk_header(ecbdata, line, len);
1158 if (line[len-1] != '\n')
1159 putc('\n', ecbdata->opt->file);
1160 return;
1161 }
1163 if (len < 1) {
1164 emit_line(ecbdata->opt, reset, reset, line, len);
1165 if (ecbdata->diff_words
1166 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1167 fputs("~\n", ecbdata->opt->file);
1168 return;
1169 }
1171 if (ecbdata->diff_words) {
1172 if (line[0] == '-') {
1173 diff_words_append(line, len,
1174 &ecbdata->diff_words->minus);
1175 return;
1176 } else if (line[0] == '+') {
1177 diff_words_append(line, len,
1178 &ecbdata->diff_words->plus);
1179 return;
1180 } else if (!prefixcmp(line, "\\ ")) {
1181 /*
1182 * Eat the "no newline at eof" marker as if we
1183 * saw a "+" or "-" line with nothing on it,
1184 * and return without diff_words_flush() to
1185 * defer processing. If this is the end of
1186 * preimage, more "+" lines may come after it.
1187 */
1188 return;
1189 }
1190 diff_words_flush(ecbdata);
1191 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1192 emit_line(ecbdata->opt, plain, reset, line, len);
1193 fputs("~\n", ecbdata->opt->file);
1194 } else {
1195 /*
1196 * Skip the prefix character, if any. With
1197 * diff_suppress_blank_empty, there may be
1198 * none.
1199 */
1200 if (line[0] != '\n') {
1201 line++;
1202 len--;
1203 }
1204 emit_line(ecbdata->opt, plain, reset, line, len);
1205 }
1206 return;
1207 }
1209 if (line[0] != '+') {
1210 const char *color =
1211 diff_get_color(ecbdata->color_diff,
1212 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1213 ecbdata->lno_in_preimage++;
1214 if (line[0] == ' ')
1215 ecbdata->lno_in_postimage++;
1216 emit_line(ecbdata->opt, color, reset, line, len);
1217 } else {
1218 ecbdata->lno_in_postimage++;
1219 emit_add_line(reset, ecbdata, line + 1, len - 1);
1220 }
1221 }
1223 static char *pprint_rename(const char *a, const char *b)
1224 {
1225 const char *old = a;
1226 const char *new = b;
1227 struct strbuf name = STRBUF_INIT;
1228 int pfx_length, sfx_length;
1229 int len_a = strlen(a);
1230 int len_b = strlen(b);
1231 int a_midlen, b_midlen;
1232 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1233 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1235 if (qlen_a || qlen_b) {
1236 quote_c_style(a, &name, NULL, 0);
1237 strbuf_addstr(&name, " => ");
1238 quote_c_style(b, &name, NULL, 0);
1239 return strbuf_detach(&name, NULL);
1240 }
1242 /* Find common prefix */
1243 pfx_length = 0;
1244 while (*old && *new && *old == *new) {
1245 if (*old == '/')
1246 pfx_length = old - a + 1;
1247 old++;
1248 new++;
1249 }
1251 /* Find common suffix */
1252 old = a + len_a;
1253 new = b + len_b;
1254 sfx_length = 0;
1255 while (a <= old && b <= new && *old == *new) {
1256 if (*old == '/')
1257 sfx_length = len_a - (old - a);
1258 old--;
1259 new--;
1260 }
1262 /*
1263 * pfx{mid-a => mid-b}sfx
1264 * {pfx-a => pfx-b}sfx
1265 * pfx{sfx-a => sfx-b}
1266 * name-a => name-b
1267 */
1268 a_midlen = len_a - pfx_length - sfx_length;
1269 b_midlen = len_b - pfx_length - sfx_length;
1270 if (a_midlen < 0)
1271 a_midlen = 0;
1272 if (b_midlen < 0)
1273 b_midlen = 0;
1275 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1276 if (pfx_length + sfx_length) {
1277 strbuf_add(&name, a, pfx_length);
1278 strbuf_addch(&name, '{');
1279 }
1280 strbuf_add(&name, a + pfx_length, a_midlen);
1281 strbuf_addstr(&name, " => ");
1282 strbuf_add(&name, b + pfx_length, b_midlen);
1283 if (pfx_length + sfx_length) {
1284 strbuf_addch(&name, '}');
1285 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1286 }
1287 return strbuf_detach(&name, NULL);
1288 }
1290 struct diffstat_t {
1291 int nr;
1292 int alloc;
1293 struct diffstat_file {
1294 char *from_name;
1295 char *name;
1296 char *print_name;
1297 unsigned is_unmerged:1;
1298 unsigned is_binary:1;
1299 unsigned is_renamed:1;
1300 uintmax_t added, deleted;
1301 } **files;
1302 };
1304 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1305 const char *name_a,
1306 const char *name_b)
1307 {
1308 struct diffstat_file *x;
1309 x = xcalloc(sizeof (*x), 1);
1310 if (diffstat->nr == diffstat->alloc) {
1311 diffstat->alloc = alloc_nr(diffstat->alloc);
1312 diffstat->files = xrealloc(diffstat->files,
1313 diffstat->alloc * sizeof(x));
1314 }
1315 diffstat->files[diffstat->nr++] = x;
1316 if (name_b) {
1317 x->from_name = xstrdup(name_a);
1318 x->name = xstrdup(name_b);
1319 x->is_renamed = 1;
1320 }
1321 else {
1322 x->from_name = NULL;
1323 x->name = xstrdup(name_a);
1324 }
1325 return x;
1326 }
1328 static void diffstat_consume(void *priv, char *line, unsigned long len)
1329 {
1330 struct diffstat_t *diffstat = priv;
1331 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1333 if (line[0] == '+')
1334 x->added++;
1335 else if (line[0] == '-')
1336 x->deleted++;
1337 }
1339 const char mime_boundary_leader[] = "------------";
1341 static int scale_linear(int it, int width, int max_change)
1342 {
1343 if (!it)
1344 return 0;
1345 /*
1346 * make sure that at least one '-' or '+' is printed if
1347 * there is any change to this path. The easiest way is to
1348 * scale linearly as if the alloted width is one column shorter
1349 * than it is, and then add 1 to the result.
1350 */
1351 return 1 + (it * (width - 1) / max_change);
1352 }
1354 static void show_name(FILE *file,
1355 const char *prefix, const char *name, int len)
1356 {
1357 fprintf(file, " %s%-*s |", prefix, len, name);
1358 }
1360 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1361 {
1362 if (cnt <= 0)
1363 return;
1364 fprintf(file, "%s", set);
1365 while (cnt--)
1366 putc(ch, file);
1367 fprintf(file, "%s", reset);
1368 }
1370 static void fill_print_name(struct diffstat_file *file)
1371 {
1372 char *pname;
1374 if (file->print_name)
1375 return;
1377 if (!file->is_renamed) {
1378 struct strbuf buf = STRBUF_INIT;
1379 if (quote_c_style(file->name, &buf, NULL, 0)) {
1380 pname = strbuf_detach(&buf, NULL);
1381 } else {
1382 pname = file->name;
1383 strbuf_release(&buf);
1384 }
1385 } else {
1386 pname = pprint_rename(file->from_name, file->name);
1387 }
1388 file->print_name = pname;
1389 }
1391 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1392 {
1393 struct strbuf sb = STRBUF_INIT;
1394 int ret;
1396 if (!files) {
1397 assert(insertions == 0 && deletions == 0);
1398 return fputs(_(" 0 files changed\n"), fp);
1399 }
1401 strbuf_addf(&sb,
1402 Q_(" %d file changed", " %d files changed", files),
1403 files);
1405 /*
1406 * For binary diff, the caller may want to print "x files
1407 * changed" with insertions == 0 && deletions == 0.
1408 *
1409 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1410 * is probably less confusing (i.e skip over "2 files changed
1411 * but nothing about added/removed lines? Is this a bug in Git?").
1412 */
1413 if (insertions || deletions == 0) {
1414 /*
1415 * TRANSLATORS: "+" in (+) is a line addition marker;
1416 * do not translate it.
1417 */
1418 strbuf_addf(&sb,
1419 Q_(", %d insertion(+)", ", %d insertions(+)",
1420 insertions),
1421 insertions);
1422 }
1424 if (deletions || insertions == 0) {
1425 /*
1426 * TRANSLATORS: "-" in (-) is a line removal marker;
1427 * do not translate it.
1428 */
1429 strbuf_addf(&sb,
1430 Q_(", %d deletion(-)", ", %d deletions(-)",
1431 deletions),
1432 deletions);
1433 }
1434 strbuf_addch(&sb, '\n');
1435 ret = fputs(sb.buf, fp);
1436 strbuf_release(&sb);
1437 return ret;
1438 }
1440 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1441 {
1442 int i, len, add, del, adds = 0, dels = 0;
1443 uintmax_t max_change = 0, max_len = 0;
1444 int total_files = data->nr;
1445 int width, name_width, count;
1446 const char *reset, *add_c, *del_c;
1447 const char *line_prefix = "";
1448 int extra_shown = 0;
1449 struct strbuf *msg = NULL;
1451 if (data->nr == 0)
1452 return;
1454 if (options->output_prefix) {
1455 msg = options->output_prefix(options, options->output_prefix_data);
1456 line_prefix = msg->buf;
1457 }
1459 width = options->stat_width ? options->stat_width : 80;
1460 name_width = options->stat_name_width ? options->stat_name_width : 50;
1461 count = options->stat_count ? options->stat_count : data->nr;
1463 /* Sanity: give at least 5 columns to the graph,
1464 * but leave at least 10 columns for the name.
1465 */
1466 if (width < 25)
1467 width = 25;
1468 if (name_width < 10)
1469 name_width = 10;
1470 else if (width < name_width + 15)
1471 name_width = width - 15;
1473 /* Find the longest filename and max number of changes */
1474 reset = diff_get_color_opt(options, DIFF_RESET);
1475 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1476 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1478 for (i = 0; (i < count) && (i < data->nr); i++) {
1479 struct diffstat_file *file = data->files[i];
1480 uintmax_t change = file->added + file->deleted;
1481 if (!data->files[i]->is_renamed &&
1482 (change == 0)) {
1483 count++; /* not shown == room for one more */
1484 continue;
1485 }
1486 fill_print_name(file);
1487 len = strlen(file->print_name);
1488 if (max_len < len)
1489 max_len = len;
1491 if (file->is_binary || file->is_unmerged)
1492 continue;
1493 if (max_change < change)
1494 max_change = change;
1495 }
1496 count = i; /* min(count, data->nr) */
1498 /* Compute the width of the graph part;
1499 * 10 is for one blank at the beginning of the line plus
1500 * " | count " between the name and the graph.
1501 *
1502 * From here on, name_width is the width of the name area,
1503 * and width is the width of the graph area.
1504 */
1505 name_width = (name_width < max_len) ? name_width : max_len;
1506 if (width < (name_width + 10) + max_change)
1507 width = width - (name_width + 10);
1508 else
1509 width = max_change;
1511 for (i = 0; i < count; i++) {
1512 const char *prefix = "";
1513 char *name = data->files[i]->print_name;
1514 uintmax_t added = data->files[i]->added;
1515 uintmax_t deleted = data->files[i]->deleted;
1516 int name_len;
1518 if (!data->files[i]->is_renamed &&
1519 (added + deleted == 0)) {
1520 total_files--;
1521 continue;
1522 }
1523 /*
1524 * "scale" the filename
1525 */
1526 len = name_width;
1527 name_len = strlen(name);
1528 if (name_width < name_len) {
1529 char *slash;
1530 prefix = "...";
1531 len -= 3;
1532 name += name_len - len;
1533 slash = strchr(name, '/');
1534 if (slash)
1535 name = slash;
1536 }
1538 if (data->files[i]->is_binary) {
1539 fprintf(options->file, "%s", line_prefix);
1540 show_name(options->file, prefix, name, len);
1541 fprintf(options->file, " Bin ");
1542 fprintf(options->file, "%s%"PRIuMAX"%s",
1543 del_c, deleted, reset);
1544 fprintf(options->file, " -> ");
1545 fprintf(options->file, "%s%"PRIuMAX"%s",
1546 add_c, added, reset);
1547 fprintf(options->file, " bytes");
1548 fprintf(options->file, "\n");
1549 continue;
1550 }
1551 else if (data->files[i]->is_unmerged) {
1552 fprintf(options->file, "%s", line_prefix);
1553 show_name(options->file, prefix, name, len);
1554 fprintf(options->file, " Unmerged\n");
1555 continue;
1556 }
1558 /*
1559 * scale the add/delete
1560 */
1561 add = added;
1562 del = deleted;
1563 adds += add;
1564 dels += del;
1566 if (width <= max_change) {
1567 int total = add + del;
1569 total = scale_linear(add + del, width, max_change);
1570 if (total < 2 && add && del)
1571 /* width >= 2 due to the sanity check */
1572 total = 2;
1573 if (add < del) {
1574 add = scale_linear(add, width, max_change);
1575 del = total - add;
1576 } else {
1577 del = scale_linear(del, width, max_change);
1578 add = total - del;
1579 }
1580 }
1581 fprintf(options->file, "%s", line_prefix);
1582 show_name(options->file, prefix, name, len);
1583 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1584 added + deleted ? " " : "");
1585 show_graph(options->file, '+', add, add_c, reset);
1586 show_graph(options->file, '-', del, del_c, reset);
1587 fprintf(options->file, "\n");
1588 }
1589 for (i = count; i < data->nr; i++) {
1590 uintmax_t added = data->files[i]->added;
1591 uintmax_t deleted = data->files[i]->deleted;
1592 if (!data->files[i]->is_renamed &&
1593 (added + deleted == 0)) {
1594 total_files--;
1595 continue;
1596 }
1597 adds += added;
1598 dels += deleted;
1599 if (!extra_shown)
1600 fprintf(options->file, "%s ...\n", line_prefix);
1601 extra_shown = 1;
1602 }
1603 fprintf(options->file, "%s", line_prefix);
1604 print_stat_summary(options->file, total_files, adds, dels);
1605 }
1607 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1608 {
1609 int i, adds = 0, dels = 0, total_files = data->nr;
1611 if (data->nr == 0)
1612 return;
1614 for (i = 0; i < data->nr; i++) {
1615 if (!data->files[i]->is_binary &&
1616 !data->files[i]->is_unmerged) {
1617 int added = data->files[i]->added;
1618 int deleted= data->files[i]->deleted;
1619 if (!data->files[i]->is_renamed &&
1620 (added + deleted == 0)) {
1621 total_files--;
1622 } else {
1623 adds += added;
1624 dels += deleted;
1625 }
1626 }
1627 }
1628 if (options->output_prefix) {
1629 struct strbuf *msg = NULL;
1630 msg = options->output_prefix(options,
1631 options->output_prefix_data);
1632 fprintf(options->file, "%s", msg->buf);
1633 }
1634 print_stat_summary(options->file, total_files, adds, dels);
1635 }
1637 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1638 {
1639 int i;
1641 if (data->nr == 0)
1642 return;
1644 for (i = 0; i < data->nr; i++) {
1645 struct diffstat_file *file = data->files[i];
1647 if (options->output_prefix) {
1648 struct strbuf *msg = NULL;
1649 msg = options->output_prefix(options,
1650 options->output_prefix_data);
1651 fprintf(options->file, "%s", msg->buf);
1652 }
1654 if (file->is_binary)
1655 fprintf(options->file, "-\t-\t");
1656 else
1657 fprintf(options->file,
1658 "%"PRIuMAX"\t%"PRIuMAX"\t",
1659 file->added, file->deleted);
1660 if (options->line_termination) {
1661 fill_print_name(file);
1662 if (!file->is_renamed)
1663 write_name_quoted(file->name, options->file,
1664 options->line_termination);
1665 else {
1666 fputs(file->print_name, options->file);
1667 putc(options->line_termination, options->file);
1668 }
1669 } else {
1670 if (file->is_renamed) {
1671 putc('\0', options->file);
1672 write_name_quoted(file->from_name, options->file, '\0');
1673 }
1674 write_name_quoted(file->name, options->file, '\0');
1675 }
1676 }
1677 }
1679 struct dirstat_file {
1680 const char *name;
1681 unsigned long changed;
1682 };
1684 struct dirstat_dir {
1685 struct dirstat_file *files;
1686 int alloc, nr, permille, cumulative;
1687 };
1689 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1690 unsigned long changed, const char *base, int baselen)
1691 {
1692 unsigned long this_dir = 0;
1693 unsigned int sources = 0;
1694 const char *line_prefix = "";
1695 struct strbuf *msg = NULL;
1697 if (opt->output_prefix) {
1698 msg = opt->output_prefix(opt, opt->output_prefix_data);
1699 line_prefix = msg->buf;
1700 }
1702 while (dir->nr) {
1703 struct dirstat_file *f = dir->files;
1704 int namelen = strlen(f->name);
1705 unsigned long this;
1706 char *slash;
1708 if (namelen < baselen)
1709 break;
1710 if (memcmp(f->name, base, baselen))
1711 break;
1712 slash = strchr(f->name + baselen, '/');
1713 if (slash) {
1714 int newbaselen = slash + 1 - f->name;
1715 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1716 sources++;
1717 } else {
1718 this = f->changed;
1719 dir->files++;
1720 dir->nr--;
1721 sources += 2;
1722 }
1723 this_dir += this;
1724 }
1726 /*
1727 * We don't report dirstat's for
1728 * - the top level
1729 * - or cases where everything came from a single directory
1730 * under this directory (sources == 1).
1731 */
1732 if (baselen && sources != 1) {
1733 if (this_dir) {
1734 int permille = this_dir * 1000 / changed;
1735 if (permille >= dir->permille) {
1736 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1737 permille / 10, permille % 10, baselen, base);
1738 if (!dir->cumulative)
1739 return 0;
1740 }
1741 }
1742 }
1743 return this_dir;
1744 }
1746 static int dirstat_compare(const void *_a, const void *_b)
1747 {
1748 const struct dirstat_file *a = _a;
1749 const struct dirstat_file *b = _b;
1750 return strcmp(a->name, b->name);
1751 }
1753 static void show_dirstat(struct diff_options *options)
1754 {
1755 int i;
1756 unsigned long changed;
1757 struct dirstat_dir dir;
1758 struct diff_queue_struct *q = &diff_queued_diff;
1760 dir.files = NULL;
1761 dir.alloc = 0;
1762 dir.nr = 0;
1763 dir.permille = options->dirstat_permille;
1764 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1766 changed = 0;
1767 for (i = 0; i < q->nr; i++) {
1768 struct diff_filepair *p = q->queue[i];
1769 const char *name;
1770 unsigned long copied, added, damage;
1771 int content_changed;
1773 name = p->two->path ? p->two->path : p->one->path;
1775 if (p->one->sha1_valid && p->two->sha1_valid)
1776 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1777 else
1778 content_changed = 1;
1780 if (!content_changed) {
1781 /*
1782 * The SHA1 has not changed, so pre-/post-content is
1783 * identical. We can therefore skip looking at the
1784 * file contents altogether.
1785 */
1786 damage = 0;
1787 goto found_damage;
1788 }
1790 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1791 /*
1792 * In --dirstat-by-file mode, we don't really need to
1793 * look at the actual file contents at all.
1794 * The fact that the SHA1 changed is enough for us to
1795 * add this file to the list of results
1796 * (with each file contributing equal damage).
1797 */
1798 damage = 1;
1799 goto found_damage;
1800 }
1802 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1803 diff_populate_filespec(p->one, 0);
1804 diff_populate_filespec(p->two, 0);
1805 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1806 &copied, &added);
1807 diff_free_filespec_data(p->one);
1808 diff_free_filespec_data(p->two);
1809 } else if (DIFF_FILE_VALID(p->one)) {
1810 diff_populate_filespec(p->one, 1);
1811 copied = added = 0;
1812 diff_free_filespec_data(p->one);
1813 } else if (DIFF_FILE_VALID(p->two)) {
1814 diff_populate_filespec(p->two, 1);
1815 copied = 0;
1816 added = p->two->size;
1817 diff_free_filespec_data(p->two);
1818 } else
1819 continue;
1821 /*
1822 * Original minus copied is the removed material,
1823 * added is the new material. They are both damages
1824 * made to the preimage.
1825 * If the resulting damage is zero, we know that
1826 * diffcore_count_changes() considers the two entries to
1827 * be identical, but since content_changed is true, we
1828 * know that there must have been _some_ kind of change,
1829 * so we force all entries to have damage > 0.
1830 */
1831 damage = (p->one->size - copied) + added;
1832 if (!damage)
1833 damage = 1;
1835 found_damage:
1836 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1837 dir.files[dir.nr].name = name;
1838 dir.files[dir.nr].changed = damage;
1839 changed += damage;
1840 dir.nr++;
1841 }
1843 /* This can happen even with many files, if everything was renames */
1844 if (!changed)
1845 return;
1847 /* Show all directories with more than x% of the changes */
1848 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1849 gather_dirstat(options, &dir, changed, "", 0);
1850 }
1852 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1853 {
1854 int i;
1855 unsigned long changed;
1856 struct dirstat_dir dir;
1858 if (data->nr == 0)
1859 return;
1861 dir.files = NULL;
1862 dir.alloc = 0;
1863 dir.nr = 0;
1864 dir.permille = options->dirstat_permille;
1865 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1867 changed = 0;
1868 for (i = 0; i < data->nr; i++) {
1869 struct diffstat_file *file = data->files[i];
1870 unsigned long damage = file->added + file->deleted;
1871 if (file->is_binary)
1872 /*
1873 * binary files counts bytes, not lines. Must find some
1874 * way to normalize binary bytes vs. textual lines.
1875 * The following heuristic assumes that there are 64
1876 * bytes per "line".
1877 * This is stupid and ugly, but very cheap...
1878 */
1879 damage = (damage + 63) / 64;
1880 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1881 dir.files[dir.nr].name = file->name;
1882 dir.files[dir.nr].changed = damage;
1883 changed += damage;
1884 dir.nr++;
1885 }
1887 /* This can happen even with many files, if everything was renames */
1888 if (!changed)
1889 return;
1891 /* Show all directories with more than x% of the changes */
1892 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1893 gather_dirstat(options, &dir, changed, "", 0);
1894 }
1896 static void free_diffstat_info(struct diffstat_t *diffstat)
1897 {
1898 int i;
1899 for (i = 0; i < diffstat->nr; i++) {
1900 struct diffstat_file *f = diffstat->files[i];
1901 if (f->name != f->print_name)
1902 free(f->print_name);
1903 free(f->name);
1904 free(f->from_name);
1905 free(f);
1906 }
1907 free(diffstat->files);
1908 }
1910 struct checkdiff_t {
1911 const char *filename;
1912 int lineno;
1913 int conflict_marker_size;
1914 struct diff_options *o;
1915 unsigned ws_rule;
1916 unsigned status;
1917 };
1919 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1920 {
1921 char firstchar;
1922 int cnt;
1924 if (len < marker_size + 1)
1925 return 0;
1926 firstchar = line[0];
1927 switch (firstchar) {
1928 case '=': case '>': case '<': case '|':
1929 break;
1930 default:
1931 return 0;
1932 }
1933 for (cnt = 1; cnt < marker_size; cnt++)
1934 if (line[cnt] != firstchar)
1935 return 0;
1936 /* line[1] thru line[marker_size-1] are same as firstchar */
1937 if (len < marker_size + 1 || !isspace(line[marker_size]))
1938 return 0;
1939 return 1;
1940 }
1942 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1943 {
1944 struct checkdiff_t *data = priv;
1945 int marker_size = data->conflict_marker_size;
1946 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1947 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1948 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
1949 char *err;
1950 char *line_prefix = "";
1951 struct strbuf *msgbuf;
1953 assert(data->o);
1954 if (data->o->output_prefix) {
1955 msgbuf = data->o->output_prefix(data->o,
1956 data->o->output_prefix_data);
1957 line_prefix = msgbuf->buf;
1958 }
1960 if (line[0] == '+') {
1961 unsigned bad;
1962 data->lineno++;
1963 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1964 data->status |= 1;
1965 fprintf(data->o->file,
1966 "%s%s:%d: leftover conflict marker\n",
1967 line_prefix, data->filename, data->lineno);
1968 }
1969 bad = ws_check(line + 1, len - 1, data->ws_rule);
1970 if (!bad)
1971 return;
1972 data->status |= bad;
1973 err = whitespace_error_string(bad);
1974 fprintf(data->o->file, "%s%s:%d: %s.\n",
1975 line_prefix, data->filename, data->lineno, err);
1976 free(err);
1977 emit_line(data->o, set, reset, line, 1);
1978 ws_check_emit(line + 1, len - 1, data->ws_rule,
1979 data->o->file, set, reset, ws);
1980 } else if (line[0] == ' ') {
1981 data->lineno++;
1982 } else if (line[0] == '@') {
1983 char *plus = strchr(line, '+');
1984 if (plus)
1985 data->lineno = strtol(plus, NULL, 10) - 1;
1986 else
1987 die("invalid diff");
1988 }
1989 }
1991 static unsigned char *deflate_it(char *data,
1992 unsigned long size,
1993 unsigned long *result_size)
1994 {
1995 int bound;
1996 unsigned char *deflated;
1997 git_zstream stream;
1999 memset(&stream, 0, sizeof(stream));
2000 git_deflate_init(&stream, zlib_compression_level);
2001 bound = git_deflate_bound(&stream, size);
2002 deflated = xmalloc(bound);
2003 stream.next_out = deflated;
2004 stream.avail_out = bound;
2006 stream.next_in = (unsigned char *)data;
2007 stream.avail_in = size;
2008 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2009 ; /* nothing */
2010 git_deflate_end(&stream);
2011 *result_size = stream.total_out;
2012 return deflated;
2013 }
2015 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2016 {
2017 void *cp;
2018 void *delta;
2019 void *deflated;
2020 void *data;
2021 unsigned long orig_size;
2022 unsigned long delta_size;
2023 unsigned long deflate_size;
2024 unsigned long data_size;
2026 /* We could do deflated delta, or we could do just deflated two,
2027 * whichever is smaller.
2028 */
2029 delta = NULL;
2030 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2031 if (one->size && two->size) {
2032 delta = diff_delta(one->ptr, one->size,
2033 two->ptr, two->size,
2034 &delta_size, deflate_size);
2035 if (delta) {
2036 void *to_free = delta;
2037 orig_size = delta_size;
2038 delta = deflate_it(delta, delta_size, &delta_size);
2039 free(to_free);
2040 }
2041 }
2043 if (delta && delta_size < deflate_size) {
2044 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2045 free(deflated);
2046 data = delta;
2047 data_size = delta_size;
2048 }
2049 else {
2050 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2051 free(delta);
2052 data = deflated;
2053 data_size = deflate_size;
2054 }
2056 /* emit data encoded in base85 */
2057 cp = data;
2058 while (data_size) {
2059 int bytes = (52 < data_size) ? 52 : data_size;
2060 char line[70];
2061 data_size -= bytes;
2062 if (bytes <= 26)
2063 line[0] = bytes + 'A' - 1;
2064 else
2065 line[0] = bytes - 26 + 'a' - 1;
2066 encode_85(line + 1, cp, bytes);
2067 cp = (char *) cp + bytes;
2068 fprintf(file, "%s", prefix);
2069 fputs(line, file);
2070 fputc('\n', file);
2071 }
2072 fprintf(file, "%s\n", prefix);
2073 free(data);
2074 }
2076 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2077 {
2078 fprintf(file, "%sGIT binary patch\n", prefix);
2079 emit_binary_diff_body(file, one, two, prefix);
2080 emit_binary_diff_body(file, two, one, prefix);
2081 }
2083 int diff_filespec_is_binary(struct diff_filespec *one)
2084 {
2085 if (one->is_binary == -1) {
2086 diff_filespec_load_driver(one);
2087 if (one->driver->binary != -1)
2088 one->is_binary = one->driver->binary;
2089 else {
2090 if (!one->data && DIFF_FILE_VALID(one))
2091 diff_populate_filespec(one, 0);
2092 if (one->data)
2093 one->is_binary = buffer_is_binary(one->data,
2094 one->size);
2095 if (one->is_binary == -1)
2096 one->is_binary = 0;
2097 }
2098 }
2099 return one->is_binary;
2100 }
2102 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2103 {
2104 diff_filespec_load_driver(one);
2105 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2106 }
2108 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2109 {
2110 if (!options->a_prefix)
2111 options->a_prefix = a;
2112 if (!options->b_prefix)
2113 options->b_prefix = b;
2114 }
2116 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2117 {
2118 if (!DIFF_FILE_VALID(one))
2119 return NULL;
2121 diff_filespec_load_driver(one);
2122 return userdiff_get_textconv(one->driver);
2123 }
2125 static void builtin_diff(const char *name_a,
2126 const char *name_b,
2127 struct diff_filespec *one,
2128 struct diff_filespec *two,
2129 const char *xfrm_msg,
2130 int must_show_header,
2131 struct diff_options *o,
2132 int complete_rewrite)
2133 {
2134 mmfile_t mf1, mf2;
2135 const char *lbl[2];
2136 char *a_one, *b_two;
2137 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2138 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2139 const char *a_prefix, *b_prefix;
2140 struct userdiff_driver *textconv_one = NULL;
2141 struct userdiff_driver *textconv_two = NULL;
2142 struct strbuf header = STRBUF_INIT;
2143 struct strbuf *msgbuf;
2144 char *line_prefix = "";
2146 if (o->output_prefix) {
2147 msgbuf = o->output_prefix(o, o->output_prefix_data);
2148 line_prefix = msgbuf->buf;
2149 }
2151 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2152 (!one->mode || S_ISGITLINK(one->mode)) &&
2153 (!two->mode || S_ISGITLINK(two->mode))) {
2154 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2155 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2156 show_submodule_summary(o->file, one ? one->path : two->path,
2157 one->sha1, two->sha1, two->dirty_submodule,
2158 del, add, reset);
2159 return;
2160 }
2162 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2163 textconv_one = get_textconv(one);
2164 textconv_two = get_textconv(two);
2165 }
2167 diff_set_mnemonic_prefix(o, "a/", "b/");
2168 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2169 a_prefix = o->b_prefix;
2170 b_prefix = o->a_prefix;
2171 } else {
2172 a_prefix = o->a_prefix;
2173 b_prefix = o->b_prefix;
2174 }
2176 /* Never use a non-valid filename anywhere if at all possible */
2177 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2178 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2180 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2181 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2182 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2183 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2184 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2185 if (lbl[0][0] == '/') {
2186 /* /dev/null */
2187 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2188 if (xfrm_msg)
2189 strbuf_addstr(&header, xfrm_msg);
2190 must_show_header = 1;
2191 }
2192 else if (lbl[1][0] == '/') {
2193 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2194 if (xfrm_msg)
2195 strbuf_addstr(&header, xfrm_msg);
2196 must_show_header = 1;
2197 }
2198 else {
2199 if (one->mode != two->mode) {
2200 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2201 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2202 must_show_header = 1;
2203 }
2204 if (xfrm_msg)
2205 strbuf_addstr(&header, xfrm_msg);
2207 /*
2208 * we do not run diff between different kind
2209 * of objects.
2210 */
2211 if ((one->mode ^ two->mode) & S_IFMT)
2212 goto free_ab_and_return;
2213 if (complete_rewrite &&
2214 (textconv_one || !diff_filespec_is_binary(one)) &&
2215 (textconv_two || !diff_filespec_is_binary(two))) {
2216 fprintf(o->file, "%s", header.buf);
2217 strbuf_reset(&header);
2218 emit_rewrite_diff(name_a, name_b, one, two,
2219 textconv_one, textconv_two, o);
2220 o->found_changes = 1;
2221 goto free_ab_and_return;
2222 }
2223 }
2225 if (o->irreversible_delete && lbl[1][0] == '/') {
2226 fprintf(o->file, "%s", header.buf);
2227 strbuf_reset(&header);
2228 goto free_ab_and_return;
2229 } else if (!DIFF_OPT_TST(o, TEXT) &&
2230 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2231 (!textconv_two && diff_filespec_is_binary(two)) )) {
2232 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2233 die("unable to read files to diff");
2234 /* Quite common confusing case */
2235 if (mf1.size == mf2.size &&
2236 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2237 if (must_show_header)
2238 fprintf(o->file, "%s", header.buf);
2239 goto free_ab_and_return;
2240 }
2241 fprintf(o->file, "%s", header.buf);
2242 strbuf_reset(&header);
2243 if (DIFF_OPT_TST(o, BINARY))
2244 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2245 else
2246 fprintf(o->file, "%sBinary files %s and %s differ\n",
2247 line_prefix, lbl[0], lbl[1]);
2248 o->found_changes = 1;
2249 } else {
2250 /* Crazy xdl interfaces.. */
2251 const char *diffopts = getenv("GIT_DIFF_OPTS");
2252 xpparam_t xpp;
2253 xdemitconf_t xecfg;
2254 struct emit_callback ecbdata;
2255 const struct userdiff_funcname *pe;
2257 if (must_show_header) {
2258 fprintf(o->file, "%s", header.buf);
2259 strbuf_reset(&header);
2260 }
2262 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2263 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2265 pe = diff_funcname_pattern(one);
2266 if (!pe)
2267 pe = diff_funcname_pattern(two);
2269 memset(&xpp, 0, sizeof(xpp));
2270 memset(&xecfg, 0, sizeof(xecfg));
2271 memset(&ecbdata, 0, sizeof(ecbdata));
2272 ecbdata.label_path = lbl;
2273 ecbdata.color_diff = want_color(o->use_color);
2274 ecbdata.found_changesp = &o->found_changes;
2275 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2276 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2277 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2278 ecbdata.opt = o;
2279 ecbdata.header = header.len ? &header : NULL;
2280 xpp.flags = o->xdl_opts;
2281 xecfg.ctxlen = o->context;
2282 xecfg.interhunkctxlen = o->interhunkcontext;
2283 xecfg.flags = XDL_EMIT_FUNCNAMES;
2284 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2285 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2286 if (pe)
2287 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2288 if (!diffopts)
2289 ;
2290 else if (!prefixcmp(diffopts, "--unified="))
2291 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2292 else if (!prefixcmp(diffopts, "-u"))
2293 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2294 if (o->word_diff)
2295 init_diff_words_data(&ecbdata, o, one, two);
2296 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2297 &xpp, &xecfg);
2298 if (o->word_diff)
2299 free_diff_words_data(&ecbdata);
2300 if (textconv_one)
2301 free(mf1.ptr);
2302 if (textconv_two)
2303 free(mf2.ptr);
2304 xdiff_clear_find_func(&xecfg);
2305 }
2307 free_ab_and_return:
2308 strbuf_release(&header);
2309 diff_free_filespec_data(one);
2310 diff_free_filespec_data(two);
2311 free(a_one);
2312 free(b_two);
2313 return;
2314 }
2316 static void builtin_diffstat(const char *name_a, const char *name_b,
2317 struct diff_filespec *one,
2318 struct diff_filespec *two,
2319 struct diffstat_t *diffstat,
2320 struct diff_options *o,
2321 int complete_rewrite)
2322 {
2323 mmfile_t mf1, mf2;
2324 struct diffstat_file *data;
2326 data = diffstat_add(diffstat, name_a, name_b);
2328 if (!one || !two) {
2329 data->is_unmerged = 1;
2330 return;
2331 }
2333 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2334 data->is_binary = 1;
2335 data->added = diff_filespec_size(two);
2336 data->deleted = diff_filespec_size(one);
2337 }
2339 else if (complete_rewrite) {
2340 diff_populate_filespec(one, 0);
2341 diff_populate_filespec(two, 0);
2342 data->deleted = count_lines(one->data, one->size);
2343 data->added = count_lines(two->data, two->size);
2344 }
2346 else {
2347 /* Crazy xdl interfaces.. */
2348 xpparam_t xpp;
2349 xdemitconf_t xecfg;
2351 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2352 die("unable to read files to diff");
2354 memset(&xpp, 0, sizeof(xpp));
2355 memset(&xecfg, 0, sizeof(xecfg));
2356 xpp.flags = o->xdl_opts;
2357 xecfg.ctxlen = o->context;
2358 xecfg.interhunkctxlen = o->interhunkcontext;
2359 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2360 &xpp, &xecfg);
2361 }
2363 diff_free_filespec_data(one);
2364 diff_free_filespec_data(two);
2365 }
2367 static void builtin_checkdiff(const char *name_a, const char *name_b,
2368 const char *attr_path,
2369 struct diff_filespec *one,
2370 struct diff_filespec *two,
2371 struct diff_options *o)
2372 {
2373 mmfile_t mf1, mf2;
2374 struct checkdiff_t data;
2376 if (!two)
2377 return;
2379 memset(&data, 0, sizeof(data));
2380 data.filename = name_b ? name_b : name_a;
2381 data.lineno = 0;
2382 data.o = o;
2383 data.ws_rule = whitespace_rule(attr_path);
2384 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2386 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2387 die("unable to read files to diff");
2389 /*
2390 * All the other codepaths check both sides, but not checking
2391 * the "old" side here is deliberate. We are checking the newly
2392 * introduced changes, and as long as the "new" side is text, we
2393 * can and should check what it introduces.
2394 */
2395 if (diff_filespec_is_binary(two))
2396 goto free_and_return;
2397 else {
2398 /* Crazy xdl interfaces.. */
2399 xpparam_t xpp;
2400 xdemitconf_t xecfg;
2402 memset(&xpp, 0, sizeof(xpp));
2403 memset(&xecfg, 0, sizeof(xecfg));
2404 xecfg.ctxlen = 1; /* at least one context line */
2405 xpp.flags = 0;
2406 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2407 &xpp, &xecfg);
2409 if (data.ws_rule & WS_BLANK_AT_EOF) {
2410 struct emit_callback ecbdata;
2411 int blank_at_eof;
2413 ecbdata.ws_rule = data.ws_rule;
2414 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2415 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2417 if (blank_at_eof) {
2418 static char *err;
2419 if (!err)
2420 err = whitespace_error_string(WS_BLANK_AT_EOF);
2421 fprintf(o->file, "%s:%d: %s.\n",
2422 data.filename, blank_at_eof, err);
2423 data.status = 1; /* report errors */
2424 }
2425 }
2426 }
2427 free_and_return:
2428 diff_free_filespec_data(one);
2429 diff_free_filespec_data(two);
2430 if (data.status)
2431 DIFF_OPT_SET(o, CHECK_FAILED);
2432 }
2434 struct diff_filespec *alloc_filespec(const char *path)
2435 {
2436 int namelen = strlen(path);
2437 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2439 memset(spec, 0, sizeof(*spec));
2440 spec->path = (char *)(spec + 1);
2441 memcpy(spec->path, path, namelen+1);
2442 spec->count = 1;
2443 spec->is_binary = -1;
2444 return spec;
2445 }
2447 void free_filespec(struct diff_filespec *spec)
2448 {
2449 if (!--spec->count) {
2450 diff_free_filespec_data(spec);
2451 free(spec);
2452 }
2453 }
2455 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2456 unsigned short mode)
2457 {
2458 if (mode) {
2459 spec->mode = canon_mode(mode);
2460 hashcpy(spec->sha1, sha1);
2461 spec->sha1_valid = !is_null_sha1(sha1);
2462 }
2463 }
2465 /*
2466 * Given a name and sha1 pair, if the index tells us the file in
2467 * the work tree has that object contents, return true, so that
2468 * prepare_temp_file() does not have to inflate and extract.
2469 */
2470 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2471 {
2472 struct cache_entry *ce;
2473 struct stat st;
2474 int pos, len;
2476 /*
2477 * We do not read the cache ourselves here, because the
2478 * benchmark with my previous version that always reads cache
2479 * shows that it makes things worse for diff-tree comparing
2480 * two linux-2.6 kernel trees in an already checked out work
2481 * tree. This is because most diff-tree comparisons deal with
2482 * only a small number of files, while reading the cache is
2483 * expensive for a large project, and its cost outweighs the
2484 * savings we get by not inflating the object to a temporary
2485 * file. Practically, this code only helps when we are used
2486 * by diff-cache --cached, which does read the cache before
2487 * calling us.
2488 */
2489 if (!active_cache)
2490 return 0;
2492 /* We want to avoid the working directory if our caller
2493 * doesn't need the data in a normal file, this system
2494 * is rather slow with its stat/open/mmap/close syscalls,
2495 * and the object is contained in a pack file. The pack
2496 * is probably already open and will be faster to obtain
2497 * the data through than the working directory. Loose
2498 * objects however would tend to be slower as they need
2499 * to be individually opened and inflated.
2500 */
2501 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2502 return 0;
2504 len = strlen(name);
2505 pos = cache_name_pos(name, len);
2506 if (pos < 0)
2507 return 0;
2508 ce = active_cache[pos];
2510 /*
2511 * This is not the sha1 we are looking for, or
2512 * unreusable because it is not a regular file.
2513 */
2514 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2515 return 0;
2517 /*
2518 * If ce is marked as "assume unchanged", there is no
2519 * guarantee that work tree matches what we are looking for.
2520 */
2521 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2522 return 0;
2524 /*
2525 * If ce matches the file in the work tree, we can reuse it.
2526 */
2527 if (ce_uptodate(ce) ||
2528 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2529 return 1;
2531 return 0;
2532 }
2534 static int populate_from_stdin(struct diff_filespec *s)
2535 {
2536 struct strbuf buf = STRBUF_INIT;
2537 size_t size = 0;
2539 if (strbuf_read(&buf, 0, 0) < 0)
2540 return error("error while reading from stdin %s",
2541 strerror(errno));
2543 s->should_munmap = 0;
2544 s->data = strbuf_detach(&buf, &size);
2545 s->size = size;
2546 s->should_free = 1;
2547 return 0;
2548 }
2550 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2551 {
2552 int len;
2553 char *data = xmalloc(100), *dirty = "";
2555 /* Are we looking at the work tree? */
2556 if (s->dirty_submodule)
2557 dirty = "-dirty";
2559 len = snprintf(data, 100,
2560 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2561 s->data = data;
2562 s->size = len;
2563 s->should_free = 1;
2564 if (size_only) {
2565 s->data = NULL;
2566 free(data);
2567 }
2568 return 0;
2569 }
2571 /*
2572 * While doing rename detection and pickaxe operation, we may need to
2573 * grab the data for the blob (or file) for our own in-core comparison.
2574 * diff_filespec has data and size fields for this purpose.
2575 */
2576 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2577 {
2578 int err = 0;
2579 if (!DIFF_FILE_VALID(s))
2580 die("internal error: asking to populate invalid file.");
2581 if (S_ISDIR(s->mode))
2582 return -1;
2584 if (s->data)
2585 return 0;
2587 if (size_only && 0 < s->size)
2588 return 0;
2590 if (S_ISGITLINK(s->mode))
2591 return diff_populate_gitlink(s, size_only);
2593 if (!s->sha1_valid ||
2594 reuse_worktree_file(s->path, s->sha1, 0)) {
2595 struct strbuf buf = STRBUF_INIT;
2596 struct stat st;
2597 int fd;
2599 if (!strcmp(s->path, "-"))
2600 return populate_from_stdin(s);
2602 if (lstat(s->path, &st) < 0) {
2603 if (errno == ENOENT) {
2604 err_empty:
2605 err = -1;
2606 empty:
2607 s->data = (char *)"";
2608 s->size = 0;
2609 return err;
2610 }
2611 }
2612 s->size = xsize_t(st.st_size);
2613 if (!s->size)
2614 goto empty;
2615 if (S_ISLNK(st.st_mode)) {
2616 struct strbuf sb = STRBUF_INIT;
2618 if (strbuf_readlink(&sb, s->path, s->size))
2619 goto err_empty;
2620 s->size = sb.len;
2621 s->data = strbuf_detach(&sb, NULL);
2622 s->should_free = 1;
2623 return 0;
2624 }
2625 if (size_only)
2626 return 0;
2627 fd = open(s->path, O_RDONLY);
2628 if (fd < 0)
2629 goto err_empty;
2630 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2631 close(fd);
2632 s->should_munmap = 1;
2634 /*
2635 * Convert from working tree format to canonical git format
2636 */
2637 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2638 size_t size = 0;
2639 munmap(s->data, s->size);
2640 s->should_munmap = 0;
2641 s->data = strbuf_detach(&buf, &size);
2642 s->size = size;
2643 s->should_free = 1;
2644 }
2645 }
2646 else {
2647 enum object_type type;
2648 if (size_only) {
2649 type = sha1_object_info(s->sha1, &s->size);
2650 if (type < 0)
2651 die("unable to read %s", sha1_to_hex(s->sha1));
2652 } else {
2653 s->data = read_sha1_file(s->sha1, &type, &s->size);
2654 if (!s->data)
2655 die("unable to read %s", sha1_to_hex(s->sha1));
2656 s->should_free = 1;
2657 }
2658 }
2659 return 0;
2660 }
2662 void diff_free_filespec_blob(struct diff_filespec *s)
2663 {
2664 if (s->should_free)
2665 free(s->data);
2666 else if (s->should_munmap)
2667 munmap(s->data, s->size);
2669 if (s->should_free || s->should_munmap) {
2670 s->should_free = s->should_munmap = 0;
2671 s->data = NULL;
2672 }
2673 }
2675 void diff_free_filespec_data(struct diff_filespec *s)
2676 {
2677 diff_free_filespec_blob(s);
2678 free(s->cnt_data);
2679 s->cnt_data = NULL;
2680 }
2682 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2683 void *blob,
2684 unsigned long size,
2685 const unsigned char *sha1,
2686 int mode)
2687 {
2688 int fd;
2689 struct strbuf buf = STRBUF_INIT;
2690 struct strbuf template = STRBUF_INIT;
2691 char *path_dup = xstrdup(path);
2692 const char *base = basename(path_dup);
2694 /* Generate "XXXXXX_basename.ext" */
2695 strbuf_addstr(&template, "XXXXXX_");
2696 strbuf_addstr(&template, base);
2698 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2699 strlen(base) + 1);
2700 if (fd < 0)
2701 die_errno("unable to create temp-file");
2702 if (convert_to_working_tree(path,
2703 (const char *)blob, (size_t)size, &buf)) {
2704 blob = buf.buf;
2705 size = buf.len;
2706 }
2707 if (write_in_full(fd, blob, size) != size)
2708 die_errno("unable to write temp-file");
2709 close(fd);
2710 temp->name = temp->tmp_path;
2711 strcpy(temp->hex, sha1_to_hex(sha1));
2712 temp->hex[40] = 0;
2713 sprintf(temp->mode, "%06o", mode);
2714 strbuf_release(&buf);
2715 strbuf_release(&template);
2716 free(path_dup);
2717 }
2719 static struct diff_tempfile *prepare_temp_file(const char *name,
2720 struct diff_filespec *one)
2721 {
2722 struct diff_tempfile *temp = claim_diff_tempfile();
2724 if (!DIFF_FILE_VALID(one)) {
2725 not_a_valid_file:
2726 /* A '-' entry produces this for file-2, and
2727 * a '+' entry produces this for file-1.
2728 */
2729 temp->name = "/dev/null";
2730 strcpy(temp->hex, ".");
2731 strcpy(temp->mode, ".");
2732 return temp;
2733 }
2735 if (!remove_tempfile_installed) {
2736 atexit(remove_tempfile);
2737 sigchain_push_common(remove_tempfile_on_signal);
2738 remove_tempfile_installed = 1;
2739 }
2741 if (!one->sha1_valid ||
2742 reuse_worktree_file(name, one->sha1, 1)) {
2743 struct stat st;
2744 if (lstat(name, &st) < 0) {
2745 if (errno == ENOENT)
2746 goto not_a_valid_file;
2747 die_errno("stat(%s)", name);
2748 }
2749 if (S_ISLNK(st.st_mode)) {
2750 struct strbuf sb = STRBUF_INIT;
2751 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2752 die_errno("readlink(%s)", name);
2753 prep_temp_blob(name, temp, sb.buf, sb.len,
2754 (one->sha1_valid ?
2755 one->sha1 : null_sha1),
2756 (one->sha1_valid ?
2757 one->mode : S_IFLNK));
2758 strbuf_release(&sb);
2759 }
2760 else {
2761 /* we can borrow from the file in the work tree */
2762 temp->name = name;
2763 if (!one->sha1_valid)
2764 strcpy(temp->hex, sha1_to_hex(null_sha1));
2765 else
2766 strcpy(temp->hex, sha1_to_hex(one->sha1));
2767 /* Even though we may sometimes borrow the
2768 * contents from the work tree, we always want
2769 * one->mode. mode is trustworthy even when
2770 * !(one->sha1_valid), as long as
2771 * DIFF_FILE_VALID(one).
2772 */
2773 sprintf(temp->mode, "%06o", one->mode);
2774 }
2775 return temp;
2776 }
2777 else {
2778 if (diff_populate_filespec(one, 0))
2779 die("cannot read data blob for %s", one->path);
2780 prep_temp_blob(name, temp, one->data, one->size,
2781 one->sha1, one->mode);
2782 }
2783 return temp;
2784 }
2786 /* An external diff command takes:
2787 *
2788 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2789 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2790 *
2791 */
2792 static void run_external_diff(const char *pgm,
2793 const char *name,
2794 const char *other,
2795 struct diff_filespec *one,
2796 struct diff_filespec *two,
2797 const char *xfrm_msg,
2798 int complete_rewrite)
2799 {
2800 const char *spawn_arg[10];
2801 int retval;
2802 const char **arg = &spawn_arg[0];
2804 if (one && two) {
2805 struct diff_tempfile *temp_one, *temp_two;
2806 const char *othername = (other ? other : name);
2807 temp_one = prepare_temp_file(name, one);
2808 temp_two = prepare_temp_file(othername, two);
2809 *arg++ = pgm;
2810 *arg++ = name;
2811 *arg++ = temp_one->name;
2812 *arg++ = temp_one->hex;
2813 *arg++ = temp_one->mode;
2814 *arg++ = temp_two->name;
2815 *arg++ = temp_two->hex;
2816 *arg++ = temp_two->mode;
2817 if (other) {
2818 *arg++ = other;
2819 *arg++ = xfrm_msg;
2820 }
2821 } else {
2822 *arg++ = pgm;
2823 *arg++ = name;
2824 }
2825 *arg = NULL;
2826 fflush(NULL);
2827 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2828 remove_tempfile();
2829 if (retval) {
2830 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2831 exit(1);
2832 }
2833 }
2835 static int similarity_index(struct diff_filepair *p)
2836 {
2837 return p->score * 100 / MAX_SCORE;
2838 }
2840 static void fill_metainfo(struct strbuf *msg,
2841 const char *name,
2842 const char *other,
2843 struct diff_filespec *one,
2844 struct diff_filespec *two,
2845 struct diff_options *o,
2846 struct diff_filepair *p,
2847 int *must_show_header,
2848 int use_color)
2849 {
2850 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2851 const char *reset = diff_get_color(use_color, DIFF_RESET);
2852 struct strbuf *msgbuf;
2853 char *line_prefix = "";
2855 *must_show_header = 1;
2856 if (o->output_prefix) {
2857 msgbuf = o->output_prefix(o, o->output_prefix_data);
2858 line_prefix = msgbuf->buf;
2859 }
2860 strbuf_init(msg, PATH_MAX * 2 + 300);
2861 switch (p->status) {
2862 case DIFF_STATUS_COPIED:
2863 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2864 line_prefix, set, similarity_index(p));
2865 strbuf_addf(msg, "%s\n%s%scopy from ",
2866 reset, line_prefix, set);
2867 quote_c_style(name, msg, NULL, 0);
2868 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2869 quote_c_style(other, msg, NULL, 0);
2870 strbuf_addf(msg, "%s\n", reset);
2871 break;
2872 case DIFF_STATUS_RENAMED:
2873 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2874 line_prefix, set, similarity_index(p));
2875 strbuf_addf(msg, "%s\n%s%srename from ",
2876 reset, line_prefix, set);
2877 quote_c_style(name, msg, NULL, 0);
2878 strbuf_addf(msg, "%s\n%s%srename to ",
2879 reset, line_prefix, set);
2880 quote_c_style(other, msg, NULL, 0);
2881 strbuf_addf(msg, "%s\n", reset);
2882 break;
2883 case DIFF_STATUS_MODIFIED:
2884 if (p->score) {
2885 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2886 line_prefix,
2887 set, similarity_index(p), reset);
2888 break;
2889 }
2890 /* fallthru */
2891 default:
2892 *must_show_header = 0;
2893 }
2894 if (one && two && hashcmp(one->sha1, two->sha1)) {
2895 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2897 if (DIFF_OPT_TST(o, BINARY)) {
2898 mmfile_t mf;
2899 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2900 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2901 abbrev = 40;
2902 }
2903 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2904 find_unique_abbrev(one->sha1, abbrev));
2905 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2906 if (one->mode == two->mode)
2907 strbuf_addf(msg, " %06o", one->mode);
2908 strbuf_addf(msg, "%s\n", reset);
2909 }
2910 }
2912 static void run_diff_cmd(const char *pgm,
2913 const char *name,
2914 const char *other,
2915 const char *attr_path,
2916 struct diff_filespec *one,
2917 struct diff_filespec *two,
2918 struct strbuf *msg,
2919 struct diff_options *o,
2920 struct diff_filepair *p)
2921 {
2922 const char *xfrm_msg = NULL;
2923 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2924 int must_show_header = 0;
2926 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2927 pgm = NULL;
2928 else {
2929 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2930 if (drv && drv->external)
2931 pgm = drv->external;
2932 }
2934 if (msg) {
2935 /*
2936 * don't use colors when the header is intended for an
2937 * external diff driver
2938 */
2939 fill_metainfo(msg, name, other, one, two, o, p,
2940 &must_show_header,
2941 want_color(o->use_color) && !pgm);
2942 xfrm_msg = msg->len ? msg->buf : NULL;
2943 }
2945 if (pgm) {
2946 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2947 complete_rewrite);
2948 return;
2949 }
2950 if (one && two)
2951 builtin_diff(name, other ? other : name,
2952 one, two, xfrm_msg, must_show_header,
2953 o, complete_rewrite);
2954 else
2955 fprintf(o->file, "* Unmerged path %s\n", name);
2956 }
2958 static void diff_fill_sha1_info(struct diff_filespec *one)
2959 {
2960 if (DIFF_FILE_VALID(one)) {
2961 if (!one->sha1_valid) {
2962 struct stat st;
2963 if (!strcmp(one->path, "-")) {
2964 hashcpy(one->sha1, null_sha1);
2965 return;
2966 }
2967 if (lstat(one->path, &st) < 0)
2968 die_errno("stat '%s'", one->path);
2969 if (index_path(one->sha1, one->path, &st, 0))
2970 die("cannot hash %s", one->path);
2971 }
2972 }
2973 else
2974 hashclr(one->sha1);
2975 }
2977 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2978 {
2979 /* Strip the prefix but do not molest /dev/null and absolute paths */
2980 if (*namep && **namep != '/') {
2981 *namep += prefix_length;
2982 if (**namep == '/')
2983 ++*namep;
2984 }
2985 if (*otherp && **otherp != '/') {
2986 *otherp += prefix_length;
2987 if (**otherp == '/')
2988 ++*otherp;
2989 }
2990 }
2992 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2993 {
2994 const char *pgm = external_diff();
2995 struct strbuf msg;
2996 struct diff_filespec *one = p->one;
2997 struct diff_filespec *two = p->two;
2998 const char *name;
2999 const char *other;
3000 const char *attr_path;
3002 name = p->one->path;
3003 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3004 attr_path = name;
3005 if (o->prefix_length)
3006 strip_prefix(o->prefix_length, &name, &other);
3008 if (DIFF_PAIR_UNMERGED(p)) {
3009 run_diff_cmd(pgm, name, NULL, attr_path,
3010 NULL, NULL, NULL, o, p);
3011 return;
3012 }
3014 diff_fill_sha1_info(one);
3015 diff_fill_sha1_info(two);
3017 if (!pgm &&
3018 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3019 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3020 /*
3021 * a filepair that changes between file and symlink
3022 * needs to be split into deletion and creation.
3023 */
3024 struct diff_filespec *null = alloc_filespec(two->path);
3025 run_diff_cmd(NULL, name, other, attr_path,
3026 one, null, &msg, o, p);
3027 free(null);
3028 strbuf_release(&msg);
3030 null = alloc_filespec(one->path);
3031 run_diff_cmd(NULL, name, other, attr_path,
3032 null, two, &msg, o, p);
3033 free(null);
3034 }
3035 else
3036 run_diff_cmd(pgm, name, other, attr_path,
3037 one, two, &msg, o, p);
3039 strbuf_release(&msg);
3040 }
3042 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3043 struct diffstat_t *diffstat)
3044 {
3045 const char *name;
3046 const char *other;
3047 int complete_rewrite = 0;
3049 if (DIFF_PAIR_UNMERGED(p)) {
3050 /* unmerged */
3051 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
3052 return;
3053 }
3055 name = p->one->path;
3056 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3058 if (o->prefix_length)
3059 strip_prefix(o->prefix_length, &name, &other);
3061 diff_fill_sha1_info(p->one);
3062 diff_fill_sha1_info(p->two);
3064 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3065 complete_rewrite = 1;
3066 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
3067 }
3069 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3070 {
3071 const char *name;
3072 const char *other;
3073 const char *attr_path;
3075 if (DIFF_PAIR_UNMERGED(p)) {
3076 /* unmerged */
3077 return;
3078 }
3080 name = p->one->path;
3081 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3082 attr_path = other ? other : name;
3084 if (o->prefix_length)
3085 strip_prefix(o->prefix_length, &name, &other);
3087 diff_fill_sha1_info(p->one);
3088 diff_fill_sha1_info(p->two);
3090 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3091 }
3093 void diff_setup(struct diff_options *options)
3094 {
3095 memcpy(options, &default_diff_options, sizeof(*options));
3097 options->file = stdout;
3099 options->line_termination = '\n';
3100 options->break_opt = -1;
3101 options->rename_limit = -1;
3102 options->dirstat_permille = diff_dirstat_permille_default;
3103 options->context = 3;
3105 options->change = diff_change;
3106 options->add_remove = diff_addremove;
3107 options->use_color = diff_use_color_default;
3108 options->detect_rename = diff_detect_rename_default;
3110 if (diff_no_prefix) {
3111 options->a_prefix = options->b_prefix = "";
3112 } else if (!diff_mnemonic_prefix) {
3113 options->a_prefix = "a/";
3114 options->b_prefix = "b/";
3115 }
3116 }
3118 int diff_setup_done(struct diff_options *options)
3119 {
3120 int count = 0;
3122 if (options->output_format & DIFF_FORMAT_NAME)
3123 count++;
3124 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3125 count++;
3126 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3127 count++;
3128 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3129 count++;
3130 if (count > 1)
3131 die("--name-only, --name-status, --check and -s are mutually exclusive");
3133 /*
3134 * Most of the time we can say "there are changes"
3135 * only by checking if there are changed paths, but
3136 * --ignore-whitespace* options force us to look
3137 * inside contents.
3138 */
3140 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3141 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3142 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3143 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3144 else
3145 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3147 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3148 options->detect_rename = DIFF_DETECT_COPY;
3150 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3151 options->prefix = NULL;
3152 if (options->prefix)
3153 options->prefix_length = strlen(options->prefix);
3154 else
3155 options->prefix_length = 0;
3157 if (options->output_format & (DIFF_FORMAT_NAME |
3158 DIFF_FORMAT_NAME_STATUS |
3159 DIFF_FORMAT_CHECKDIFF |
3160 DIFF_FORMAT_NO_OUTPUT))
3161 options->output_format &= ~(DIFF_FORMAT_RAW |
3162 DIFF_FORMAT_NUMSTAT |
3163 DIFF_FORMAT_DIFFSTAT |
3164 DIFF_FORMAT_SHORTSTAT |
3165 DIFF_FORMAT_DIRSTAT |
3166 DIFF_FORMAT_SUMMARY |
3167 DIFF_FORMAT_PATCH);
3169 /*
3170 * These cases always need recursive; we do not drop caller-supplied
3171 * recursive bits for other formats here.
3172 */
3173 if (options->output_format & (DIFF_FORMAT_PATCH |
3174 DIFF_FORMAT_NUMSTAT |
3175 DIFF_FORMAT_DIFFSTAT |
3176 DIFF_FORMAT_SHORTSTAT |
3177 DIFF_FORMAT_DIRSTAT |
3178 DIFF_FORMAT_SUMMARY |
3179 DIFF_FORMAT_CHECKDIFF))
3180 DIFF_OPT_SET(options, RECURSIVE);
3181 /*
3182 * Also pickaxe would not work very well if you do not say recursive
3183 */
3184 if (options->pickaxe)
3185 DIFF_OPT_SET(options, RECURSIVE);
3186 /*
3187 * When patches are generated, submodules diffed against the work tree
3188 * must be checked for dirtiness too so it can be shown in the output
3189 */
3190 if (options->output_format & DIFF_FORMAT_PATCH)
3191 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3193 if (options->detect_rename && options->rename_limit < 0)
3194 options->rename_limit = diff_rename_limit_default;
3195 if (options->setup & DIFF_SETUP_USE_CACHE) {
3196 if (!active_cache)
3197 /* read-cache does not die even when it fails
3198 * so it is safe for us to do this here. Also
3199 * it does not smudge active_cache or active_nr
3200 * when it fails, so we do not have to worry about
3201 * cleaning it up ourselves either.
3202 */
3203 read_cache();
3204 }
3205 if (options->abbrev <= 0 || 40 < options->abbrev)
3206 options->abbrev = 40; /* full */
3208 /*
3209 * It does not make sense to show the first hit we happened
3210 * to have found. It does not make sense not to return with
3211 * exit code in such a case either.
3212 */
3213 if (DIFF_OPT_TST(options, QUICK)) {
3214 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3215 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3216 }
3218 return 0;
3219 }
3221 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3222 {
3223 char c, *eq;
3224 int len;
3226 if (*arg != '-')
3227 return 0;
3228 c = *++arg;
3229 if (!c)
3230 return 0;
3231 if (c == arg_short) {
3232 c = *++arg;
3233 if (!c)
3234 return 1;
3235 if (val && isdigit(c)) {
3236 char *end;
3237 int n = strtoul(arg, &end, 10);
3238 if (*end)
3239 return 0;
3240 *val = n;
3241 return 1;
3242 }
3243 return 0;
3244 }
3245 if (c != '-')
3246 return 0;
3247 arg++;
3248 eq = strchr(arg, '=');
3249 if (eq)
3250 len = eq - arg;
3251 else
3252 len = strlen(arg);
3253 if (!len || strncmp(arg, arg_long, len))
3254 return 0;
3255 if (eq) {
3256 int n;
3257 char *end;
3258 if (!isdigit(*++eq))
3259 return 0;
3260 n = strtoul(eq, &end, 10);
3261 if (*end)
3262 return 0;
3263 *val = n;
3264 }
3265 return 1;
3266 }
3268 static int diff_scoreopt_parse(const char *opt);
3270 static inline int short_opt(char opt, const char **argv,
3271 const char **optarg)
3272 {
3273 const char *arg = argv[0];
3274 if (arg[0] != '-' || arg[1] != opt)
3275 return 0;
3276 if (arg[2] != '\0') {
3277 *optarg = arg + 2;
3278 return 1;
3279 }
3280 if (!argv[1])
3281 die("Option '%c' requires a value", opt);
3282 *optarg = argv[1];
3283 return 2;
3284 }
3286 int parse_long_opt(const char *opt, const char **argv,
3287 const char **optarg)
3288 {
3289 const char *arg = argv[0];
3290 if (arg[0] != '-' || arg[1] != '-')
3291 return 0;
3292 arg += strlen("--");
3293 if (prefixcmp(arg, opt))
3294 return 0;
3295 arg += strlen(opt);
3296 if (*arg == '=') { /* sticked form: --option=value */
3297 *optarg = arg + 1;
3298 return 1;
3299 }
3300 if (*arg != '\0')
3301 return 0;
3302 /* separate form: --option value */
3303 if (!argv[1])
3304 die("Option '--%s' requires a value", opt);
3305 *optarg = argv[1];
3306 return 2;
3307 }
3309 static int stat_opt(struct diff_options *options, const char **av)
3310 {
3311 const char *arg = av[0];
3312 char *end;
3313 int width = options->stat_width;
3314 int name_width = options->stat_name_width;
3315 int count = options->stat_count;
3316 int argcount = 1;
3318 arg += strlen("--stat");
3319 end = (char *)arg;
3321 switch (*arg) {
3322 case '-':
3323 if (!prefixcmp(arg, "-width")) {
3324 arg += strlen("-width");
3325 if (*arg == '=')
3326 width = strtoul(arg + 1, &end, 10);
3327 else if (!*arg && !av[1])
3328 die("Option '--stat-width' requires a value");
3329 else if (!*arg) {
3330 width = strtoul(av[1], &end, 10);
3331 argcount = 2;
3332 }
3333 } else if (!prefixcmp(arg, "-name-width")) {
3334 arg += strlen("-name-width");
3335 if (*arg == '=')
3336 name_width = strtoul(arg + 1, &end, 10);
3337 else if (!*arg && !av[1])
3338 die("Option '--stat-name-width' requires a value");
3339 else if (!*arg) {
3340 name_width = strtoul(av[1], &end, 10);
3341 argcount = 2;
3342 }
3343 } else if (!prefixcmp(arg, "-count")) {
3344 arg += strlen("-count");
3345 if (*arg == '=')
3346 count = strtoul(arg + 1, &end, 10);
3347 else if (!*arg && !av[1])
3348 die("Option '--stat-count' requires a value");
3349 else if (!*arg) {
3350 count = strtoul(av[1], &end, 10);
3351 argcount = 2;
3352 }
3353 }
3354 break;
3355 case '=':
3356 width = strtoul(arg+1, &end, 10);
3357 if (*end == ',')
3358 name_width = strtoul(end+1, &end, 10);
3359 if (*end == ',')
3360 count = strtoul(end+1, &end, 10);
3361 }
3363 /* Important! This checks all the error cases! */
3364 if (*end)
3365 return 0;
3366 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3367 options->stat_name_width = name_width;
3368 options->stat_width = width;
3369 options->stat_count = count;
3370 return argcount;
3371 }
3373 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3374 {
3375 struct strbuf errmsg = STRBUF_INIT;
3376 if (parse_dirstat_params(options, params, &errmsg))
3377 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3378 errmsg.buf);
3379 strbuf_release(&errmsg);
3380 /*
3381 * The caller knows a dirstat-related option is given from the command
3382 * line; allow it to say "return this_function();"
3383 */
3384 options->output_format |= DIFF_FORMAT_DIRSTAT;
3385 return 1;
3386 }
3388 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3389 {
3390 const char *arg = av[0];
3391 const char *optarg;
3392 int argcount;
3394 /* Output format options */
3395 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3396 options->output_format |= DIFF_FORMAT_PATCH;
3397 else if (opt_arg(arg, 'U', "unified", &options->context))
3398 options->output_format |= DIFF_FORMAT_PATCH;
3399 else if (!strcmp(arg, "--raw"))
3400 options->output_format |= DIFF_FORMAT_RAW;
3401 else if (!strcmp(arg, "--patch-with-raw"))
3402 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3403 else if (!strcmp(arg, "--numstat"))
3404 options->output_format |= DIFF_FORMAT_NUMSTAT;
3405 else if (!strcmp(arg, "--shortstat"))
3406 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3407 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3408 return parse_dirstat_opt(options, "");
3409 else if (!prefixcmp(arg, "-X"))
3410 return parse_dirstat_opt(options, arg + 2);
3411 else if (!prefixcmp(arg, "--dirstat="))
3412 return parse_dirstat_opt(options, arg + 10);
3413 else if (!strcmp(arg, "--cumulative"))
3414 return parse_dirstat_opt(options, "cumulative");
3415 else if (!strcmp(arg, "--dirstat-by-file"))
3416 return parse_dirstat_opt(options, "files");
3417 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3418 parse_dirstat_opt(options, "files");
3419 return parse_dirstat_opt(options, arg + 18);
3420 }
3421 else if (!strcmp(arg, "--check"))
3422 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3423 else if (!strcmp(arg, "--summary"))
3424 options->output_format |= DIFF_FORMAT_SUMMARY;
3425 else if (!strcmp(arg, "--patch-with-stat"))
3426 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3427 else if (!strcmp(arg, "--name-only"))
3428 options->output_format |= DIFF_FORMAT_NAME;
3429 else if (!strcmp(arg, "--name-status"))
3430 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3431 else if (!strcmp(arg, "-s"))
3432 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3433 else if (!prefixcmp(arg, "--stat"))
3434 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3435 return stat_opt(options, av);
3437 /* renames options */
3438 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3439 !strcmp(arg, "--break-rewrites")) {
3440 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3441 return error("invalid argument to -B: %s", arg+2);
3442 }
3443 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3444 !strcmp(arg, "--find-renames")) {
3445 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3446 return error("invalid argument to -M: %s", arg+2);
3447 options->detect_rename = DIFF_DETECT_RENAME;
3448 }
3449 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3450 options->irreversible_delete = 1;
3451 }
3452 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3453 !strcmp(arg, "--find-copies")) {
3454 if (options->detect_rename == DIFF_DETECT_COPY)
3455 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3456 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3457 return error("invalid argument to -C: %s", arg+2);
3458 options->detect_rename = DIFF_DETECT_COPY;
3459 }
3460 else if (!strcmp(arg, "--no-renames"))
3461 options->detect_rename = 0;
3462 else if (!strcmp(arg, "--relative"))
3463 DIFF_OPT_SET(options, RELATIVE_NAME);
3464 else if (!prefixcmp(arg, "--relative=")) {
3465 DIFF_OPT_SET(options, RELATIVE_NAME);
3466 options->prefix = arg + 11;
3467 }
3469 /* xdiff options */
3470 else if (!strcmp(arg, "--minimal"))
3471 DIFF_XDL_SET(options, NEED_MINIMAL);
3472 else if (!strcmp(arg, "--no-minimal"))
3473 DIFF_XDL_CLR(options, NEED_MINIMAL);
3474 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3475 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3476 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3477 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3478 else if (!strcmp(arg, "--ignore-space-at-eol"))
3479 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3480 else if (!strcmp(arg, "--patience"))
3481 DIFF_XDL_SET(options, PATIENCE_DIFF);
3482 else if (!strcmp(arg, "--histogram"))
3483 DIFF_XDL_SET(options, HISTOGRAM_DIFF);
3485 /* flags options */
3486 else if (!strcmp(arg, "--binary")) {
3487 options->output_format |= DIFF_FORMAT_PATCH;
3488 DIFF_OPT_SET(options, BINARY);
3489 }
3490 else if (!strcmp(arg, "--full-index"))
3491 DIFF_OPT_SET(options, FULL_INDEX);
3492 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3493 DIFF_OPT_SET(options, TEXT);
3494 else if (!strcmp(arg, "-R"))
3495 DIFF_OPT_SET(options, REVERSE_DIFF);
3496 else if (!strcmp(arg, "--find-copies-harder"))
3497 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3498 else if (!strcmp(arg, "--follow"))
3499 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3500 else if (!strcmp(arg, "--color"))
3501 options->use_color = 1;
3502 else if (!prefixcmp(arg, "--color=")) {
3503 int value = git_config_colorbool(NULL, arg+8);
3504 if (value < 0)
3505 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3506 options->use_color = value;
3507 }
3508 else if (!strcmp(arg, "--no-color"))
3509 options->use_color = 0;
3510 else if (!strcmp(arg, "--color-words")) {
3511 options->use_color = 1;
3512 options->word_diff = DIFF_WORDS_COLOR;
3513 }
3514 else if (!prefixcmp(arg, "--color-words=")) {
3515 options->use_color = 1;
3516 options->word_diff = DIFF_WORDS_COLOR;
3517 options->word_regex = arg + 14;
3518 }
3519 else if (!strcmp(arg, "--word-diff")) {
3520 if (options->word_diff == DIFF_WORDS_NONE)
3521 options->word_diff = DIFF_WORDS_PLAIN;
3522 }
3523 else if (!prefixcmp(arg, "--word-diff=")) {
3524 const char *type = arg + 12;
3525 if (!strcmp(type, "plain"))
3526 options->word_diff = DIFF_WORDS_PLAIN;
3527 else if (!strcmp(type, "color")) {
3528 options->use_color = 1;
3529 options->word_diff = DIFF_WORDS_COLOR;
3530 }
3531 else if (!strcmp(type, "porcelain"))
3532 options->word_diff = DIFF_WORDS_PORCELAIN;
3533 else if (!strcmp(type, "none"))
3534 options->word_diff = DIFF_WORDS_NONE;
3535 else
3536 die("bad --word-diff argument: %s", type);
3537 }
3538 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3539 if (options->word_diff == DIFF_WORDS_NONE)
3540 options->word_diff = DIFF_WORDS_PLAIN;
3541 options->word_regex = optarg;
3542 return argcount;
3543 }
3544 else if (!strcmp(arg, "--exit-code"))
3545 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3546 else if (!strcmp(arg, "--quiet"))
3547 DIFF_OPT_SET(options, QUICK);
3548 else if (!strcmp(arg, "--ext-diff"))
3549 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3550 else if (!strcmp(arg, "--no-ext-diff"))
3551 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3552 else if (!strcmp(arg, "--textconv"))
3553 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3554 else if (!strcmp(arg, "--no-textconv"))
3555 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3556 else if (!strcmp(arg, "--ignore-submodules")) {
3557 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3558 handle_ignore_submodules_arg(options, "all");
3559 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3560 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3561 handle_ignore_submodules_arg(options, arg + 20);
3562 } else if (!strcmp(arg, "--submodule"))
3563 DIFF_OPT_SET(options, SUBMODULE_LOG);
3564 else if (!prefixcmp(arg, "--submodule=")) {
3565 if (!strcmp(arg + 12, "log"))
3566 DIFF_OPT_SET(options, SUBMODULE_LOG);
3567 }
3569 /* misc options */
3570 else if (!strcmp(arg, "-z"))
3571 options->line_termination = 0;
3572 else if ((argcount = short_opt('l', av, &optarg))) {
3573 options->rename_limit = strtoul(optarg, NULL, 10);
3574 return argcount;
3575 }
3576 else if ((argcount = short_opt('S', av, &optarg))) {
3577 options->pickaxe = optarg;
3578 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3579 return argcount;
3580 } else if ((argcount = short_opt('G', av, &optarg))) {
3581 options->pickaxe = optarg;
3582 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3583 return argcount;
3584 }
3585 else if (!strcmp(arg, "--pickaxe-all"))
3586 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3587 else if (!strcmp(arg, "--pickaxe-regex"))
3588 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3589 else if ((argcount = short_opt('O', av, &optarg))) {
3590 options->orderfile = optarg;
3591 return argcount;
3592 }
3593 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3594 options->filter = optarg;
3595 return argcount;
3596 }
3597 else if (!strcmp(arg, "--abbrev"))
3598 options->abbrev = DEFAULT_ABBREV;
3599 else if (!prefixcmp(arg, "--abbrev=")) {
3600 options->abbrev = strtoul(arg + 9, NULL, 10);
3601 if (options->abbrev < MINIMUM_ABBREV)
3602 options->abbrev = MINIMUM_ABBREV;
3603 else if (40 < options->abbrev)
3604 options->abbrev = 40;
3605 }
3606 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3607 options->a_prefix = optarg;
3608 return argcount;
3609 }
3610 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3611 options->b_prefix = optarg;
3612 return argcount;
3613 }
3614 else if (!strcmp(arg, "--no-prefix"))
3615 options->a_prefix = options->b_prefix = "";
3616 else if (opt_arg(arg, '\0', "inter-hunk-context",
3617 &options->interhunkcontext))
3618 ;
3619 else if (!strcmp(arg, "-W"))
3620 DIFF_OPT_SET(options, FUNCCONTEXT);
3621 else if (!strcmp(arg, "--function-context"))
3622 DIFF_OPT_SET(options, FUNCCONTEXT);
3623 else if (!strcmp(arg, "--no-function-context"))
3624 DIFF_OPT_CLR(options, FUNCCONTEXT);
3625 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3626 options->file = fopen(optarg, "w");
3627 if (!options->file)
3628 die_errno("Could not open '%s'", optarg);
3629 options->close_file = 1;
3630 return argcount;
3631 } else
3632 return 0;
3633 return 1;
3634 }
3636 int parse_rename_score(const char **cp_p)
3637 {
3638 unsigned long num, scale;
3639 int ch, dot;
3640 const char *cp = *cp_p;
3642 num = 0;
3643 scale = 1;
3644 dot = 0;
3645 for (;;) {
3646 ch = *cp;
3647 if ( !dot && ch == '.' ) {
3648 scale = 1;
3649 dot = 1;
3650 } else if ( ch == '%' ) {
3651 scale = dot ? scale*100 : 100;
3652 cp++; /* % is always at the end */
3653 break;
3654 } else if ( ch >= '0' && ch <= '9' ) {
3655 if ( scale < 100000 ) {
3656 scale *= 10;
3657 num = (num*10) + (ch-'0');
3658 }
3659 } else {
3660 break;
3661 }
3662 cp++;
3663 }
3664 *cp_p = cp;
3666 /* user says num divided by scale and we say internally that
3667 * is MAX_SCORE * num / scale.
3668 */
3669 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3670 }
3672 static int diff_scoreopt_parse(const char *opt)
3673 {
3674 int opt1, opt2, cmd;
3676 if (*opt++ != '-')
3677 return -1;
3678 cmd = *opt++;
3679 if (cmd == '-') {
3680 /* convert the long-form arguments into short-form versions */
3681 if (!prefixcmp(opt, "break-rewrites")) {
3682 opt += strlen("break-rewrites");
3683 if (*opt == 0 || *opt++ == '=')
3684 cmd = 'B';
3685 } else if (!prefixcmp(opt, "find-copies")) {
3686 opt += strlen("find-copies");
3687 if (*opt == 0 || *opt++ == '=')
3688 cmd = 'C';
3689 } else if (!prefixcmp(opt, "find-renames")) {
3690 opt += strlen("find-renames");
3691 if (*opt == 0 || *opt++ == '=')
3692 cmd = 'M';
3693 }
3694 }
3695 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3696 return -1; /* that is not a -M, -C nor -B option */
3698 opt1 = parse_rename_score(&opt);
3699 if (cmd != 'B')
3700 opt2 = 0;
3701 else {
3702 if (*opt == 0)
3703 opt2 = 0;
3704 else if (*opt != '/')
3705 return -1; /* we expect -B80/99 or -B80 */
3706 else {
3707 opt++;
3708 opt2 = parse_rename_score(&opt);
3709 }
3710 }
3711 if (*opt != 0)
3712 return -1;
3713 return opt1 | (opt2 << 16);
3714 }
3716 struct diff_queue_struct diff_queued_diff;
3718 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3719 {
3720 if (queue->alloc <= queue->nr) {
3721 queue->alloc = alloc_nr(queue->alloc);
3722 queue->queue = xrealloc(queue->queue,
3723 sizeof(dp) * queue->alloc);
3724 }
3725 queue->queue[queue->nr++] = dp;
3726 }
3728 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3729 struct diff_filespec *one,
3730 struct diff_filespec *two)
3731 {
3732 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3733 dp->one = one;
3734 dp->two = two;
3735 if (queue)
3736 diff_q(queue, dp);
3737 return dp;
3738 }
3740 void diff_free_filepair(struct diff_filepair *p)
3741 {
3742 free_filespec(p->one);
3743 free_filespec(p->two);
3744 free(p);
3745 }
3747 /* This is different from find_unique_abbrev() in that
3748 * it stuffs the result with dots for alignment.
3749 */
3750 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3751 {
3752 int abblen;
3753 const char *abbrev;
3754 if (len == 40)
3755 return sha1_to_hex(sha1);
3757 abbrev = find_unique_abbrev(sha1, len);
3758 abblen = strlen(abbrev);
3759 if (abblen < 37) {
3760 static char hex[41];
3761 if (len < abblen && abblen <= len + 2)
3762 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3763 else
3764 sprintf(hex, "%s...", abbrev);
3765 return hex;
3766 }
3767 return sha1_to_hex(sha1);
3768 }
3770 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3771 {
3772 int line_termination = opt->line_termination;
3773 int inter_name_termination = line_termination ? '\t' : '\0';
3774 if (opt->output_prefix) {
3775 struct strbuf *msg = NULL;
3776 msg = opt->output_prefix(opt, opt->output_prefix_data);
3777 fprintf(opt->file, "%s", msg->buf);
3778 }
3780 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3781 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3782 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3783 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3784 }
3785 if (p->score) {
3786 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3787 inter_name_termination);
3788 } else {
3789 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3790 }
3792 if (p->status == DIFF_STATUS_COPIED ||
3793 p->status == DIFF_STATUS_RENAMED) {
3794 const char *name_a, *name_b;
3795 name_a = p->one->path;
3796 name_b = p->two->path;
3797 strip_prefix(opt->prefix_length, &name_a, &name_b);
3798 write_name_quoted(name_a, opt->file, inter_name_termination);
3799 write_name_quoted(name_b, opt->file, line_termination);
3800 } else {
3801 const char *name_a, *name_b;
3802 name_a = p->one->mode ? p->one->path : p->two->path;
3803 name_b = NULL;
3804 strip_prefix(opt->prefix_length, &name_a, &name_b);
3805 write_name_quoted(name_a, opt->file, line_termination);
3806 }
3807 }
3809 int diff_unmodified_pair(struct diff_filepair *p)
3810 {
3811 /* This function is written stricter than necessary to support
3812 * the currently implemented transformers, but the idea is to
3813 * let transformers to produce diff_filepairs any way they want,
3814 * and filter and clean them up here before producing the output.
3815 */
3816 struct diff_filespec *one = p->one, *two = p->two;
3818 if (DIFF_PAIR_UNMERGED(p))
3819 return 0; /* unmerged is interesting */
3821 /* deletion, addition, mode or type change
3822 * and rename are all interesting.
3823 */
3824 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3825 DIFF_PAIR_MODE_CHANGED(p) ||
3826 strcmp(one->path, two->path))
3827 return 0;
3829 /* both are valid and point at the same path. that is, we are
3830 * dealing with a change.
3831 */
3832 if (one->sha1_valid && two->sha1_valid &&
3833 !hashcmp(one->sha1, two->sha1) &&
3834 !one->dirty_submodule && !two->dirty_submodule)
3835 return 1; /* no change */
3836 if (!one->sha1_valid && !two->sha1_valid)
3837 return 1; /* both look at the same file on the filesystem. */
3838 return 0;
3839 }
3841 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3842 {
3843 if (diff_unmodified_pair(p))
3844 return;
3846 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3847 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3848 return; /* no tree diffs in patch format */
3850 run_diff(p, o);
3851 }
3853 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3854 struct diffstat_t *diffstat)
3855 {
3856 if (diff_unmodified_pair(p))
3857 return;
3859 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3860 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3861 return; /* no useful stat for tree diffs */
3863 run_diffstat(p, o, diffstat);
3864 }
3866 static void diff_flush_checkdiff(struct diff_filepair *p,
3867 struct diff_options *o)
3868 {
3869 if (diff_unmodified_pair(p))
3870 return;
3872 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3873 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3874 return; /* nothing to check in tree diffs */
3876 run_checkdiff(p, o);
3877 }
3879 int diff_queue_is_empty(void)
3880 {
3881 struct diff_queue_struct *q = &diff_queued_diff;
3882 int i;
3883 for (i = 0; i < q->nr; i++)
3884 if (!diff_unmodified_pair(q->queue[i]))
3885 return 0;
3886 return 1;
3887 }
3889 #if DIFF_DEBUG
3890 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3891 {
3892 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3893 x, one ? one : "",
3894 s->path,
3895 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3896 s->mode,
3897 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3898 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3899 x, one ? one : "",
3900 s->size, s->xfrm_flags);
3901 }
3903 void diff_debug_filepair(const struct diff_filepair *p, int i)
3904 {
3905 diff_debug_filespec(p->one, i, "one");
3906 diff_debug_filespec(p->two, i, "two");
3907 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3908 p->score, p->status ? p->status : '?',
3909 p->one->rename_used, p->broken_pair);
3910 }
3912 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3913 {
3914 int i;
3915 if (msg)
3916 fprintf(stderr, "%s\n", msg);
3917 fprintf(stderr, "q->nr = %d\n", q->nr);
3918 for (i = 0; i < q->nr; i++) {
3919 struct diff_filepair *p = q->queue[i];
3920 diff_debug_filepair(p, i);
3921 }
3922 }
3923 #endif
3925 static void diff_resolve_rename_copy(void)
3926 {
3927 int i;
3928 struct diff_filepair *p;
3929 struct diff_queue_struct *q = &diff_queued_diff;
3931 diff_debug_queue("resolve-rename-copy", q);
3933 for (i = 0; i < q->nr; i++) {
3934 p = q->queue[i];
3935 p->status = 0; /* undecided */
3936 if (DIFF_PAIR_UNMERGED(p))
3937 p->status = DIFF_STATUS_UNMERGED;
3938 else if (!DIFF_FILE_VALID(p->one))
3939 p->status = DIFF_STATUS_ADDED;
3940 else if (!DIFF_FILE_VALID(p->two))
3941 p->status = DIFF_STATUS_DELETED;
3942 else if (DIFF_PAIR_TYPE_CHANGED(p))
3943 p->status = DIFF_STATUS_TYPE_CHANGED;
3945 /* from this point on, we are dealing with a pair
3946 * whose both sides are valid and of the same type, i.e.
3947 * either in-place edit or rename/copy edit.
3948 */
3949 else if (DIFF_PAIR_RENAME(p)) {
3950 /*
3951 * A rename might have re-connected a broken
3952 * pair up, causing the pathnames to be the
3953 * same again. If so, that's not a rename at
3954 * all, just a modification..
3955 *
3956 * Otherwise, see if this source was used for
3957 * multiple renames, in which case we decrement
3958 * the count, and call it a copy.
3959 */
3960 if (!strcmp(p->one->path, p->two->path))
3961 p->status = DIFF_STATUS_MODIFIED;
3962 else if (--p->one->rename_used > 0)
3963 p->status = DIFF_STATUS_COPIED;
3964 else
3965 p->status = DIFF_STATUS_RENAMED;
3966 }
3967 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3968 p->one->mode != p->two->mode ||
3969 p->one->dirty_submodule ||
3970 p->two->dirty_submodule ||
3971 is_null_sha1(p->one->sha1))
3972 p->status = DIFF_STATUS_MODIFIED;
3973 else {
3974 /* This is a "no-change" entry and should not
3975 * happen anymore, but prepare for broken callers.
3976 */
3977 error("feeding unmodified %s to diffcore",
3978 p->one->path);
3979 p->status = DIFF_STATUS_UNKNOWN;
3980 }
3981 }
3982 diff_debug_queue("resolve-rename-copy done", q);
3983 }
3985 static int check_pair_status(struct diff_filepair *p)
3986 {
3987 switch (p->status) {
3988 case DIFF_STATUS_UNKNOWN:
3989 return 0;
3990 case 0:
3991 die("internal error in diff-resolve-rename-copy");
3992 default:
3993 return 1;
3994 }
3995 }
3997 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3998 {
3999 int fmt = opt->output_format;
4001 if (fmt & DIFF_FORMAT_CHECKDIFF)
4002 diff_flush_checkdiff(p, opt);
4003 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4004 diff_flush_raw(p, opt);
4005 else if (fmt & DIFF_FORMAT_NAME) {
4006 const char *name_a, *name_b;
4007 name_a = p->two->path;
4008 name_b = NULL;
4009 strip_prefix(opt->prefix_length, &name_a, &name_b);
4010 write_name_quoted(name_a, opt->file, opt->line_termination);
4011 }
4012 }
4014 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4015 {
4016 if (fs->mode)
4017 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4018 else
4019 fprintf(file, " %s ", newdelete);
4020 write_name_quoted(fs->path, file, '\n');
4021 }
4024 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4025 const char *line_prefix)
4026 {
4027 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4028 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4029 p->two->mode, show_name ? ' ' : '\n');
4030 if (show_name) {
4031 write_name_quoted(p->two->path, file, '\n');
4032 }
4033 }
4034 }
4036 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4037 const char *line_prefix)
4038 {
4039 char *names = pprint_rename(p->one->path, p->two->path);
4041 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4042 free(names);
4043 show_mode_change(file, p, 0, line_prefix);
4044 }
4046 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4047 {
4048 FILE *file = opt->file;
4049 char *line_prefix = "";
4051 if (opt->output_prefix) {
4052 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4053 line_prefix = buf->buf;
4054 }
4056 switch(p->status) {
4057 case DIFF_STATUS_DELETED:
4058 fputs(line_prefix, file);
4059 show_file_mode_name(file, "delete", p->one);
4060 break;
4061 case DIFF_STATUS_ADDED:
4062 fputs(line_prefix, file);
4063 show_file_mode_name(file, "create", p->two);
4064 break;
4065 case DIFF_STATUS_COPIED:
4066 fputs(line_prefix, file);
4067 show_rename_copy(file, "copy", p, line_prefix);
4068 break;
4069 case DIFF_STATUS_RENAMED:
4070 fputs(line_prefix, file);
4071 show_rename_copy(file, "rename", p, line_prefix);
4072 break;
4073 default:
4074 if (p->score) {
4075 fprintf(file, "%s rewrite ", line_prefix);
4076 write_name_quoted(p->two->path, file, ' ');
4077 fprintf(file, "(%d%%)\n", similarity_index(p));
4078 }
4079 show_mode_change(file, p, !p->score, line_prefix);
4080 break;
4081 }
4082 }
4084 struct patch_id_t {
4085 git_SHA_CTX *ctx;
4086 int patchlen;
4087 };
4089 static int remove_space(char *line, int len)
4090 {
4091 int i;
4092 char *dst = line;
4093 unsigned char c;
4095 for (i = 0; i < len; i++)
4096 if (!isspace((c = line[i])))
4097 *dst++ = c;
4099 return dst - line;
4100 }
4102 static void patch_id_consume(void *priv, char *line, unsigned long len)
4103 {
4104 struct patch_id_t *data = priv;
4105 int new_len;
4107 /* Ignore line numbers when computing the SHA1 of the patch */
4108 if (!prefixcmp(line, "@@ -"))
4109 return;
4111 new_len = remove_space(line, len);
4113 git_SHA1_Update(data->ctx, line, new_len);
4114 data->patchlen += new_len;
4115 }
4117 /* returns 0 upon success, and writes result into sha1 */
4118 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4119 {
4120 struct diff_queue_struct *q = &diff_queued_diff;
4121 int i;
4122 git_SHA_CTX ctx;
4123 struct patch_id_t data;
4124 char buffer[PATH_MAX * 4 + 20];
4126 git_SHA1_Init(&ctx);
4127 memset(&data, 0, sizeof(struct patch_id_t));
4128 data.ctx = &ctx;
4130 for (i = 0; i < q->nr; i++) {
4131 xpparam_t xpp;
4132 xdemitconf_t xecfg;
4133 mmfile_t mf1, mf2;
4134 struct diff_filepair *p = q->queue[i];
4135 int len1, len2;
4137 memset(&xpp, 0, sizeof(xpp));
4138 memset(&xecfg, 0, sizeof(xecfg));
4139 if (p->status == 0)
4140 return error("internal diff status error");
4141 if (p->status == DIFF_STATUS_UNKNOWN)
4142 continue;
4143 if (diff_unmodified_pair(p))
4144 continue;
4145 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4146 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4147 continue;
4148 if (DIFF_PAIR_UNMERGED(p))
4149 continue;
4151 diff_fill_sha1_info(p->one);
4152 diff_fill_sha1_info(p->two);
4153 if (fill_mmfile(&mf1, p->one) < 0 ||
4154 fill_mmfile(&mf2, p->two) < 0)
4155 return error("unable to read files to diff");
4157 len1 = remove_space(p->one->path, strlen(p->one->path));
4158 len2 = remove_space(p->two->path, strlen(p->two->path));
4159 if (p->one->mode == 0)
4160 len1 = snprintf(buffer, sizeof(buffer),
4161 "diff--gita/%.*sb/%.*s"
4162 "newfilemode%06o"
4163 "---/dev/null"
4164 "+++b/%.*s",
4165 len1, p->one->path,
4166 len2, p->two->path,
4167 p->two->mode,
4168 len2, p->two->path);
4169 else if (p->two->mode == 0)
4170 len1 = snprintf(buffer, sizeof(buffer),
4171 "diff--gita/%.*sb/%.*s"
4172 "deletedfilemode%06o"
4173 "---a/%.*s"
4174 "+++/dev/null",
4175 len1, p->one->path,
4176 len2, p->two->path,
4177 p->one->mode,
4178 len1, p->one->path);
4179 else
4180 len1 = snprintf(buffer, sizeof(buffer),
4181 "diff--gita/%.*sb/%.*s"
4182 "---a/%.*s"
4183 "+++b/%.*s",
4184 len1, p->one->path,
4185 len2, p->two->path,
4186 len1, p->one->path,
4187 len2, p->two->path);
4188 git_SHA1_Update(&ctx, buffer, len1);
4190 if (diff_filespec_is_binary(p->one) ||
4191 diff_filespec_is_binary(p->two)) {
4192 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4193 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4194 continue;
4195 }
4197 xpp.flags = 0;
4198 xecfg.ctxlen = 3;
4199 xecfg.flags = 0;
4200 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4201 &xpp, &xecfg);
4202 }
4204 git_SHA1_Final(sha1, &ctx);
4205 return 0;
4206 }
4208 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4209 {
4210 struct diff_queue_struct *q = &diff_queued_diff;
4211 int i;
4212 int result = diff_get_patch_id(options, sha1);
4214 for (i = 0; i < q->nr; i++)
4215 diff_free_filepair(q->queue[i]);
4217 free(q->queue);
4218 DIFF_QUEUE_CLEAR(q);
4220 return result;
4221 }
4223 static int is_summary_empty(const struct diff_queue_struct *q)
4224 {
4225 int i;
4227 for (i = 0; i < q->nr; i++) {
4228 const struct diff_filepair *p = q->queue[i];
4230 switch (p->status) {
4231 case DIFF_STATUS_DELETED:
4232 case DIFF_STATUS_ADDED:
4233 case DIFF_STATUS_COPIED:
4234 case DIFF_STATUS_RENAMED:
4235 return 0;
4236 default:
4237 if (p->score)
4238 return 0;
4239 if (p->one->mode && p->two->mode &&
4240 p->one->mode != p->two->mode)
4241 return 0;
4242 break;
4243 }
4244 }
4245 return 1;
4246 }
4248 static const char rename_limit_warning[] =
4249 "inexact rename detection was skipped due to too many files.";
4251 static const char degrade_cc_to_c_warning[] =
4252 "only found copies from modified paths due to too many files.";
4254 static const char rename_limit_advice[] =
4255 "you may want to set your %s variable to at least "
4256 "%d and retry the command.";
4258 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4259 {
4260 if (degraded_cc)
4261 warning(degrade_cc_to_c_warning);
4262 else if (needed)
4263 warning(rename_limit_warning);
4264 else
4265 return;
4266 if (0 < needed && needed < 32767)
4267 warning(rename_limit_advice, varname, needed);
4268 }
4270 void diff_flush(struct diff_options *options)
4271 {
4272 struct diff_queue_struct *q = &diff_queued_diff;
4273 int i, output_format = options->output_format;
4274 int separator = 0;
4275 int dirstat_by_line = 0;
4277 /*
4278 * Order: raw, stat, summary, patch
4279 * or: name/name-status/checkdiff (other bits clear)
4280 */
4281 if (!q->nr)
4282 goto free_queue;
4284 if (output_format & (DIFF_FORMAT_RAW |
4285 DIFF_FORMAT_NAME |
4286 DIFF_FORMAT_NAME_STATUS |
4287 DIFF_FORMAT_CHECKDIFF)) {
4288 for (i = 0; i < q->nr; i++) {
4289 struct diff_filepair *p = q->queue[i];
4290 if (check_pair_status(p))
4291 flush_one_pair(p, options);
4292 }
4293 separator++;
4294 }
4296 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4297 dirstat_by_line = 1;
4299 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4300 dirstat_by_line) {
4301 struct diffstat_t diffstat;
4303 memset(&diffstat, 0, sizeof(struct diffstat_t));
4304 for (i = 0; i < q->nr; i++) {
4305 struct diff_filepair *p = q->queue[i];
4306 if (check_pair_status(p))
4307 diff_flush_stat(p, options, &diffstat);
4308 }
4309 if (output_format & DIFF_FORMAT_NUMSTAT)
4310 show_numstat(&diffstat, options);
4311 if (output_format & DIFF_FORMAT_DIFFSTAT)
4312 show_stats(&diffstat, options);
4313 if (output_format & DIFF_FORMAT_SHORTSTAT)
4314 show_shortstats(&diffstat, options);
4315 if (output_format & DIFF_FORMAT_DIRSTAT)
4316 show_dirstat_by_line(&diffstat, options);
4317 free_diffstat_info(&diffstat);
4318 separator++;
4319 }
4320 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4321 show_dirstat(options);
4323 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4324 for (i = 0; i < q->nr; i++) {
4325 diff_summary(options, q->queue[i]);
4326 }
4327 separator++;
4328 }
4330 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4331 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4332 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4333 /*
4334 * run diff_flush_patch for the exit status. setting
4335 * options->file to /dev/null should be safe, becaue we
4336 * aren't supposed to produce any output anyway.
4337 */
4338 if (options->close_file)
4339 fclose(options->file);
4340 options->file = fopen("/dev/null", "w");
4341 if (!options->file)
4342 die_errno("Could not open /dev/null");
4343 options->close_file = 1;
4344 for (i = 0; i < q->nr; i++) {
4345 struct diff_filepair *p = q->queue[i];
4346 if (check_pair_status(p))
4347 diff_flush_patch(p, options);
4348 if (options->found_changes)
4349 break;
4350 }
4351 }
4353 if (output_format & DIFF_FORMAT_PATCH) {
4354 if (separator) {
4355 putc(options->line_termination, options->file);
4356 if (options->stat_sep) {
4357 /* attach patch instead of inline */
4358 fputs(options->stat_sep, options->file);
4359 }
4360 }
4362 for (i = 0; i < q->nr; i++) {
4363 struct diff_filepair *p = q->queue[i];
4364 if (check_pair_status(p))
4365 diff_flush_patch(p, options);
4366 }
4367 }
4369 if (output_format & DIFF_FORMAT_CALLBACK)
4370 options->format_callback(q, options, options->format_callback_data);
4372 for (i = 0; i < q->nr; i++)
4373 diff_free_filepair(q->queue[i]);
4374 free_queue:
4375 free(q->queue);
4376 DIFF_QUEUE_CLEAR(q);
4377 if (options->close_file)
4378 fclose(options->file);
4380 /*
4381 * Report the content-level differences with HAS_CHANGES;
4382 * diff_addremove/diff_change does not set the bit when
4383 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4384 */
4385 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4386 if (options->found_changes)
4387 DIFF_OPT_SET(options, HAS_CHANGES);
4388 else
4389 DIFF_OPT_CLR(options, HAS_CHANGES);
4390 }
4391 }
4393 static void diffcore_apply_filter(const char *filter)
4394 {
4395 int i;
4396 struct diff_queue_struct *q = &diff_queued_diff;
4397 struct diff_queue_struct outq;
4398 DIFF_QUEUE_CLEAR(&outq);
4400 if (!filter)
4401 return;
4403 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4404 int found;
4405 for (i = found = 0; !found && i < q->nr; i++) {
4406 struct diff_filepair *p = q->queue[i];
4407 if (((p->status == DIFF_STATUS_MODIFIED) &&
4408 ((p->score &&
4409 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4410 (!p->score &&
4411 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4412 ((p->status != DIFF_STATUS_MODIFIED) &&
4413 strchr(filter, p->status)))
4414 found++;
4415 }
4416 if (found)
4417 return;
4419 /* otherwise we will clear the whole queue
4420 * by copying the empty outq at the end of this
4421 * function, but first clear the current entries
4422 * in the queue.
4423 */
4424 for (i = 0; i < q->nr; i++)
4425 diff_free_filepair(q->queue[i]);
4426 }
4427 else {
4428 /* Only the matching ones */
4429 for (i = 0; i < q->nr; i++) {
4430 struct diff_filepair *p = q->queue[i];
4432 if (((p->status == DIFF_STATUS_MODIFIED) &&
4433 ((p->score &&
4434 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4435 (!p->score &&
4436 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4437 ((p->status != DIFF_STATUS_MODIFIED) &&
4438 strchr(filter, p->status)))
4439 diff_q(&outq, p);
4440 else
4441 diff_free_filepair(p);
4442 }
4443 }
4444 free(q->queue);
4445 *q = outq;
4446 }
4448 /* Check whether two filespecs with the same mode and size are identical */
4449 static int diff_filespec_is_identical(struct diff_filespec *one,
4450 struct diff_filespec *two)
4451 {
4452 if (S_ISGITLINK(one->mode))
4453 return 0;
4454 if (diff_populate_filespec(one, 0))
4455 return 0;
4456 if (diff_populate_filespec(two, 0))
4457 return 0;
4458 return !memcmp(one->data, two->data, one->size);
4459 }
4461 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4462 {
4463 int i;
4464 struct diff_queue_struct *q = &diff_queued_diff;
4465 struct diff_queue_struct outq;
4466 DIFF_QUEUE_CLEAR(&outq);
4468 for (i = 0; i < q->nr; i++) {
4469 struct diff_filepair *p = q->queue[i];
4471 /*
4472 * 1. Entries that come from stat info dirtiness
4473 * always have both sides (iow, not create/delete),
4474 * one side of the object name is unknown, with
4475 * the same mode and size. Keep the ones that
4476 * do not match these criteria. They have real
4477 * differences.
4478 *
4479 * 2. At this point, the file is known to be modified,
4480 * with the same mode and size, and the object
4481 * name of one side is unknown. Need to inspect
4482 * the identical contents.
4483 */
4484 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4485 !DIFF_FILE_VALID(p->two) ||
4486 (p->one->sha1_valid && p->two->sha1_valid) ||
4487 (p->one->mode != p->two->mode) ||
4488 diff_populate_filespec(p->one, 1) ||
4489 diff_populate_filespec(p->two, 1) ||
4490 (p->one->size != p->two->size) ||
4491 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4492 diff_q(&outq, p);
4493 else {
4494 /*
4495 * The caller can subtract 1 from skip_stat_unmatch
4496 * to determine how many paths were dirty only
4497 * due to stat info mismatch.
4498 */
4499 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4500 diffopt->skip_stat_unmatch++;
4501 diff_free_filepair(p);
4502 }
4503 }
4504 free(q->queue);
4505 *q = outq;
4506 }
4508 static int diffnamecmp(const void *a_, const void *b_)
4509 {
4510 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4511 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4512 const char *name_a, *name_b;
4514 name_a = a->one ? a->one->path : a->two->path;
4515 name_b = b->one ? b->one->path : b->two->path;
4516 return strcmp(name_a, name_b);
4517 }
4519 void diffcore_fix_diff_index(struct diff_options *options)
4520 {
4521 struct diff_queue_struct *q = &diff_queued_diff;
4522 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4523 }
4525 void diffcore_std(struct diff_options *options)
4526 {
4527 if (options->skip_stat_unmatch)
4528 diffcore_skip_stat_unmatch(options);
4529 if (!options->found_follow) {
4530 /* See try_to_follow_renames() in tree-diff.c */
4531 if (options->break_opt != -1)
4532 diffcore_break(options->break_opt);
4533 if (options->detect_rename)
4534 diffcore_rename(options);
4535 if (options->break_opt != -1)
4536 diffcore_merge_broken();
4537 }
4538 if (options->pickaxe)
4539 diffcore_pickaxe(options);
4540 if (options->orderfile)
4541 diffcore_order(options->orderfile);
4542 if (!options->found_follow)
4543 /* See try_to_follow_renames() in tree-diff.c */
4544 diff_resolve_rename_copy();
4545 diffcore_apply_filter(options->filter);
4547 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4548 DIFF_OPT_SET(options, HAS_CHANGES);
4549 else
4550 DIFF_OPT_CLR(options, HAS_CHANGES);
4552 options->found_follow = 0;
4553 }
4555 int diff_result_code(struct diff_options *opt, int status)
4556 {
4557 int result = 0;
4559 diff_warn_rename_limit("diff.renamelimit",
4560 opt->needed_rename_limit,
4561 opt->degraded_cc_to_c);
4562 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4563 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4564 return status;
4565 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4566 DIFF_OPT_TST(opt, HAS_CHANGES))
4567 result |= 01;
4568 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4569 DIFF_OPT_TST(opt, CHECK_FAILED))
4570 result |= 02;
4571 return result;
4572 }
4574 int diff_can_quit_early(struct diff_options *opt)
4575 {
4576 return (DIFF_OPT_TST(opt, QUICK) &&
4577 !opt->filter &&
4578 DIFF_OPT_TST(opt, HAS_CHANGES));
4579 }
4581 /*
4582 * Shall changes to this submodule be ignored?
4583 *
4584 * Submodule changes can be configured to be ignored separately for each path,
4585 * but that configuration can be overridden from the command line.
4586 */
4587 static int is_submodule_ignored(const char *path, struct diff_options *options)
4588 {
4589 int ignored = 0;
4590 unsigned orig_flags = options->flags;
4591 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4592 set_diffopt_flags_from_submodule_config(options, path);
4593 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4594 ignored = 1;
4595 options->flags = orig_flags;
4596 return ignored;
4597 }
4599 void diff_addremove(struct diff_options *options,
4600 int addremove, unsigned mode,
4601 const unsigned char *sha1,
4602 const char *concatpath, unsigned dirty_submodule)
4603 {
4604 struct diff_filespec *one, *two;
4606 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4607 return;
4609 /* This may look odd, but it is a preparation for
4610 * feeding "there are unchanged files which should
4611 * not produce diffs, but when you are doing copy
4612 * detection you would need them, so here they are"
4613 * entries to the diff-core. They will be prefixed
4614 * with something like '=' or '*' (I haven't decided
4615 * which but should not make any difference).
4616 * Feeding the same new and old to diff_change()
4617 * also has the same effect.
4618 * Before the final output happens, they are pruned after
4619 * merged into rename/copy pairs as appropriate.
4620 */
4621 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4622 addremove = (addremove == '+' ? '-' :
4623 addremove == '-' ? '+' : addremove);
4625 if (options->prefix &&
4626 strncmp(concatpath, options->prefix, options->prefix_length))
4627 return;
4629 one = alloc_filespec(concatpath);
4630 two = alloc_filespec(concatpath);
4632 if (addremove != '+')
4633 fill_filespec(one, sha1, mode);
4634 if (addremove != '-') {
4635 fill_filespec(two, sha1, mode);
4636 two->dirty_submodule = dirty_submodule;
4637 }
4639 diff_queue(&diff_queued_diff, one, two);
4640 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4641 DIFF_OPT_SET(options, HAS_CHANGES);
4642 }
4644 void diff_change(struct diff_options *options,
4645 unsigned old_mode, unsigned new_mode,
4646 const unsigned char *old_sha1,
4647 const unsigned char *new_sha1,
4648 const char *concatpath,
4649 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4650 {
4651 struct diff_filespec *one, *two;
4653 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4654 is_submodule_ignored(concatpath, options))
4655 return;
4657 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4658 unsigned tmp;
4659 const unsigned char *tmp_c;
4660 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4661 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4662 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4663 new_dirty_submodule = tmp;
4664 }
4666 if (options->prefix &&
4667 strncmp(concatpath, options->prefix, options->prefix_length))
4668 return;
4670 one = alloc_filespec(concatpath);
4671 two = alloc_filespec(concatpath);
4672 fill_filespec(one, old_sha1, old_mode);
4673 fill_filespec(two, new_sha1, new_mode);
4674 one->dirty_submodule = old_dirty_submodule;
4675 two->dirty_submodule = new_dirty_submodule;
4677 diff_queue(&diff_queued_diff, one, two);
4678 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4679 DIFF_OPT_SET(options, HAS_CHANGES);
4680 }
4682 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4683 {
4684 struct diff_filepair *pair;
4685 struct diff_filespec *one, *two;
4687 if (options->prefix &&
4688 strncmp(path, options->prefix, options->prefix_length))
4689 return NULL;
4691 one = alloc_filespec(path);
4692 two = alloc_filespec(path);
4693 pair = diff_queue(&diff_queued_diff, one, two);
4694 pair->is_unmerged = 1;
4695 return pair;
4696 }
4698 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4699 size_t *outsize)
4700 {
4701 struct diff_tempfile *temp;
4702 const char *argv[3];
4703 const char **arg = argv;
4704 struct child_process child;
4705 struct strbuf buf = STRBUF_INIT;
4706 int err = 0;
4708 temp = prepare_temp_file(spec->path, spec);
4709 *arg++ = pgm;
4710 *arg++ = temp->name;
4711 *arg = NULL;
4713 memset(&child, 0, sizeof(child));
4714 child.use_shell = 1;
4715 child.argv = argv;
4716 child.out = -1;
4717 if (start_command(&child)) {
4718 remove_tempfile();
4719 return NULL;
4720 }
4722 if (strbuf_read(&buf, child.out, 0) < 0)
4723 err = error("error reading from textconv command '%s'", pgm);
4724 close(child.out);
4726 if (finish_command(&child) || err) {
4727 strbuf_release(&buf);
4728 remove_tempfile();
4729 return NULL;
4730 }
4731 remove_tempfile();
4733 return strbuf_detach(&buf, outsize);
4734 }
4736 size_t fill_textconv(struct userdiff_driver *driver,
4737 struct diff_filespec *df,
4738 char **outbuf)
4739 {
4740 size_t size;
4742 if (!driver || !driver->textconv) {
4743 if (!DIFF_FILE_VALID(df)) {
4744 *outbuf = "";
4745 return 0;
4746 }
4747 if (diff_populate_filespec(df, 0))
4748 die("unable to read files to diff");
4749 *outbuf = df->data;
4750 return df->size;
4751 }
4753 if (driver->textconv_cache && df->sha1_valid) {
4754 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4755 &size);
4756 if (*outbuf)
4757 return size;
4758 }
4760 *outbuf = run_textconv(driver->textconv, df, &size);
4761 if (!*outbuf)
4762 die("unable to read files to diff");
4764 if (driver->textconv_cache && df->sha1_valid) {
4765 /* ignore errors, as we might be in a readonly repository */
4766 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4767 size);
4768 /*
4769 * we could save up changes and flush them all at the end,
4770 * but we would need an extra call after all diffing is done.
4771 * Since generating a cache entry is the slow path anyway,
4772 * this extra overhead probably isn't a big deal.
4773 */
4774 notes_cache_write(driver->textconv_cache);
4775 }
4777 return size;
4778 }