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-config.h"
17#include "submodule.h"
18#include "ll-merge.h"
19#include "string-list.h"
20#include "argv-array.h"
21#ifdef NO_FAST_WORKING_DIRECTORY
23#define FAST_WORKING_DIRECTORY 0
24#else
25#define FAST_WORKING_DIRECTORY 1
26#endif
27static int diff_detect_rename_default;
29static int diff_rename_limit_default = 400;
30static int diff_suppress_blank_empty;
31static int diff_use_color_default = -1;
32static int diff_context_default = 3;
33static const char *diff_word_regex_cfg;
34static const char *external_diff_cmd_cfg;
35static const char *diff_order_file_cfg;
36int diff_auto_refresh_index = 1;
37static int diff_mnemonic_prefix;
38static int diff_no_prefix;
39static int diff_stat_graph_width;
40static int diff_dirstat_permille_default = 30;
41static struct diff_options default_diff_options;
42static long diff_algorithm;
43static char diff_colors[][COLOR_MAXLEN] = {
45 GIT_COLOR_RESET,
46 GIT_COLOR_NORMAL, /* CONTEXT */
47 GIT_COLOR_BOLD, /* METAINFO */
48 GIT_COLOR_CYAN, /* FRAGINFO */
49 GIT_COLOR_RED, /* OLD */
50 GIT_COLOR_GREEN, /* NEW */
51 GIT_COLOR_YELLOW, /* COMMIT */
52 GIT_COLOR_BG_RED, /* WHITESPACE */
53 GIT_COLOR_NORMAL, /* FUNCINFO */
54};
55static int parse_diff_color_slot(const char *var)
57{
58 if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
59 return DIFF_CONTEXT;
60 if (!strcasecmp(var, "meta"))
61 return DIFF_METAINFO;
62 if (!strcasecmp(var, "frag"))
63 return DIFF_FRAGINFO;
64 if (!strcasecmp(var, "old"))
65 return DIFF_FILE_OLD;
66 if (!strcasecmp(var, "new"))
67 return DIFF_FILE_NEW;
68 if (!strcasecmp(var, "commit"))
69 return DIFF_COMMIT;
70 if (!strcasecmp(var, "whitespace"))
71 return DIFF_WHITESPACE;
72 if (!strcasecmp(var, "func"))
73 return DIFF_FUNCINFO;
74 return -1;
75}
76static int parse_dirstat_params(struct diff_options *options, const char *params_string,
78 struct strbuf *errmsg)
79{
80 char *params_copy = xstrdup(params_string);
81 struct string_list params = STRING_LIST_INIT_NODUP;
82 int ret = 0;
83 int i;
84 if (*params_copy)
86 string_list_split_in_place(¶ms, params_copy, ',', -1);
87 for (i = 0; i < params.nr; i++) {
88 const char *p = params.items[i].string;
89 if (!strcmp(p, "changes")) {
90 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
91 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
92 } else if (!strcmp(p, "lines")) {
93 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
94 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
95 } else if (!strcmp(p, "files")) {
96 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
97 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
98 } else if (!strcmp(p, "noncumulative")) {
99 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
100 } else if (!strcmp(p, "cumulative")) {
101 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
102 } else if (isdigit(*p)) {
103 char *end;
104 int permille = strtoul(p, &end, 10) * 10;
105 if (*end == '.' && isdigit(*++end)) {
106 /* only use first digit */
107 permille += *end - '0';
108 /* .. and ignore any further digits */
109 while (isdigit(*++end))
110 ; /* nothing */
111 }
112 if (!*end)
113 options->dirstat_permille = permille;
114 else {
115 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
116 p);
117 ret++;
118 }
119 } else {
120 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
121 ret++;
122 }
123 }
125 string_list_clear(¶ms, 0);
126 free(params_copy);
127 return ret;
128}
129static int parse_submodule_params(struct diff_options *options, const char *value)
131{
132 if (!strcmp(value, "log"))
133 DIFF_OPT_SET(options, SUBMODULE_LOG);
134 else if (!strcmp(value, "short"))
135 DIFF_OPT_CLR(options, SUBMODULE_LOG);
136 else
137 return -1;
138 return 0;
139}
140static int git_config_rename(const char *var, const char *value)
142{
143 if (!value)
144 return DIFF_DETECT_RENAME;
145 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
146 return DIFF_DETECT_COPY;
147 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
148}
149long parse_algorithm_value(const char *value)
151{
152 if (!value)
153 return -1;
154 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
155 return 0;
156 else if (!strcasecmp(value, "minimal"))
157 return XDF_NEED_MINIMAL;
158 else if (!strcasecmp(value, "patience"))
159 return XDF_PATIENCE_DIFF;
160 else if (!strcasecmp(value, "histogram"))
161 return XDF_HISTOGRAM_DIFF;
162 return -1;
163}
164/*
166 * These are to give UI layer defaults.
167 * The core-level commands such as git-diff-files should
168 * never be affected by the setting of diff.renames
169 * the user happens to have in the configuration file.
170 */
171int git_diff_ui_config(const char *var, const char *value, void *cb)
172{
173 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
174 diff_use_color_default = git_config_colorbool(var, value);
175 return 0;
176 }
177 if (!strcmp(var, "diff.context")) {
178 diff_context_default = git_config_int(var, value);
179 if (diff_context_default < 0)
180 return -1;
181 return 0;
182 }
183 if (!strcmp(var, "diff.renames")) {
184 diff_detect_rename_default = git_config_rename(var, value);
185 return 0;
186 }
187 if (!strcmp(var, "diff.autorefreshindex")) {
188 diff_auto_refresh_index = git_config_bool(var, value);
189 return 0;
190 }
191 if (!strcmp(var, "diff.mnemonicprefix")) {
192 diff_mnemonic_prefix = git_config_bool(var, value);
193 return 0;
194 }
195 if (!strcmp(var, "diff.noprefix")) {
196 diff_no_prefix = git_config_bool(var, value);
197 return 0;
198 }
199 if (!strcmp(var, "diff.statgraphwidth")) {
200 diff_stat_graph_width = git_config_int(var, value);
201 return 0;
202 }
203 if (!strcmp(var, "diff.external"))
204 return git_config_string(&external_diff_cmd_cfg, var, value);
205 if (!strcmp(var, "diff.wordregex"))
206 return git_config_string(&diff_word_regex_cfg, var, value);
207 if (!strcmp(var, "diff.orderfile"))
208 return git_config_pathname(&diff_order_file_cfg, var, value);
209 if (!strcmp(var, "diff.ignoresubmodules"))
211 handle_ignore_submodules_arg(&default_diff_options, value);
212 if (!strcmp(var, "diff.submodule")) {
214 if (parse_submodule_params(&default_diff_options, value))
215 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
216 value);
217 return 0;
218 }
219 if (!strcmp(var, "diff.algorithm")) {
221 diff_algorithm = parse_algorithm_value(value);
222 if (diff_algorithm < 0)
223 return -1;
224 return 0;
225 }
226 if (git_color_config(var, value, cb) < 0)
228 return -1;
229 return git_diff_basic_config(var, value, cb);
231}
232int git_diff_basic_config(const char *var, const char *value, void *cb)
234{
235 const char *name;
236 if (!strcmp(var, "diff.renamelimit")) {
238 diff_rename_limit_default = git_config_int(var, value);
239 return 0;
240 }
241 if (userdiff_config(var, value) < 0)
243 return -1;
244 if (skip_prefix(var, "diff.color.", &name) ||
246 skip_prefix(var, "color.diff.", &name)) {
247 int slot = parse_diff_color_slot(name);
248 if (slot < 0)
249 return 0;
250 if (!value)
251 return config_error_nonbool(var);
252 return color_parse(value, diff_colors[slot]);
253 }
254 /* like GNU diff's --suppress-blank-empty option */
256 if (!strcmp(var, "diff.suppressblankempty") ||
257 /* for backwards compatibility */
258 !strcmp(var, "diff.suppress-blank-empty")) {
259 diff_suppress_blank_empty = git_config_bool(var, value);
260 return 0;
261 }
262 if (!strcmp(var, "diff.dirstat")) {
264 struct strbuf errmsg = STRBUF_INIT;
265 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
266 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
267 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
268 errmsg.buf);
269 strbuf_release(&errmsg);
270 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
271 return 0;
272 }
273 if (starts_with(var, "submodule."))
275 return parse_submodule_config_option(var, value);
276 return git_default_config(var, value, cb);
278}
279static char *quote_two(const char *one, const char *two)
281{
282 int need_one = quote_c_style(one, NULL, NULL, 1);
283 int need_two = quote_c_style(two, NULL, NULL, 1);
284 struct strbuf res = STRBUF_INIT;
285 if (need_one + need_two) {
287 strbuf_addch(&res, '"');
288 quote_c_style(one, &res, NULL, 1);
289 quote_c_style(two, &res, NULL, 1);
290 strbuf_addch(&res, '"');
291 } else {
292 strbuf_addstr(&res, one);
293 strbuf_addstr(&res, two);
294 }
295 return strbuf_detach(&res, NULL);
296}
297static const char *external_diff(void)
299{
300 static const char *external_diff_cmd = NULL;
301 static int done_preparing = 0;
302 if (done_preparing)
304 return external_diff_cmd;
305 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
306 if (!external_diff_cmd)
307 external_diff_cmd = external_diff_cmd_cfg;
308 done_preparing = 1;
309 return external_diff_cmd;
310}
311static struct diff_tempfile {
313 const char *name; /* filename external diff should read from */
314 char hex[41];
315 char mode[10];
316 char tmp_path[PATH_MAX];
317} diff_temp[2];
318typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
320struct emit_callback {
322 int color_diff;
323 unsigned ws_rule;
324 int blank_at_eof_in_preimage;
325 int blank_at_eof_in_postimage;
326 int lno_in_preimage;
327 int lno_in_postimage;
328 sane_truncate_fn truncate;
329 const char **label_path;
330 struct diff_words_data *diff_words;
331 struct diff_options *opt;
332 int *found_changesp;
333 struct strbuf *header;
334};
335static int count_lines(const char *data, int size)
337{
338 int count, ch, completely_empty = 1, nl_just_seen = 0;
339 count = 0;
340 while (0 < size--) {
341 ch = *data++;
342 if (ch == '\n') {
343 count++;
344 nl_just_seen = 1;
345 completely_empty = 0;
346 }
347 else {
348 nl_just_seen = 0;
349 completely_empty = 0;
350 }
351 }
352 if (completely_empty)
353 return 0;
354 if (!nl_just_seen)
355 count++; /* no trailing newline */
356 return count;
357}
358static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
360{
361 if (!DIFF_FILE_VALID(one)) {
362 mf->ptr = (char *)""; /* does not matter */
363 mf->size = 0;
364 return 0;
365 }
366 else if (diff_populate_filespec(one, 0))
367 return -1;
368 mf->ptr = one->data;
370 mf->size = one->size;
371 return 0;
372}
373/* like fill_mmfile, but only for size, so we can avoid retrieving blob */
375static unsigned long diff_filespec_size(struct diff_filespec *one)
376{
377 if (!DIFF_FILE_VALID(one))
378 return 0;
379 diff_populate_filespec(one, CHECK_SIZE_ONLY);
380 return one->size;
381}
382static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
384{
385 char *ptr = mf->ptr;
386 long size = mf->size;
387 int cnt = 0;
388 if (!size)
390 return cnt;
391 ptr += size - 1; /* pointing at the very end */
392 if (*ptr != '\n')
393 ; /* incomplete line */
394 else
395 ptr--; /* skip the last LF */
396 while (mf->ptr < ptr) {
397 char *prev_eol;
398 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
399 if (*prev_eol == '\n')
400 break;
401 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
402 break;
403 cnt++;
404 ptr = prev_eol - 1;
405 }
406 return cnt;
407}
408static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
410 struct emit_callback *ecbdata)
411{
412 int l1, l2, at;
413 unsigned ws_rule = ecbdata->ws_rule;
414 l1 = count_trailing_blank(mf1, ws_rule);
415 l2 = count_trailing_blank(mf2, ws_rule);
416 if (l2 <= l1) {
417 ecbdata->blank_at_eof_in_preimage = 0;
418 ecbdata->blank_at_eof_in_postimage = 0;
419 return;
420 }
421 at = count_lines(mf1->ptr, mf1->size);
422 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
423 at = count_lines(mf2->ptr, mf2->size);
425 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
426}
427static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
429 int first, const char *line, int len)
430{
431 int has_trailing_newline, has_trailing_carriage_return;
432 int nofirst;
433 FILE *file = o->file;
434 fputs(diff_line_prefix(o), file);
436 if (len == 0) {
438 has_trailing_newline = (first == '\n');
439 has_trailing_carriage_return = (!has_trailing_newline &&
440 (first == '\r'));
441 nofirst = has_trailing_newline || has_trailing_carriage_return;
442 } else {
443 has_trailing_newline = (len > 0 && line[len-1] == '\n');
444 if (has_trailing_newline)
445 len--;
446 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
447 if (has_trailing_carriage_return)
448 len--;
449 nofirst = 0;
450 }
451 if (len || !nofirst) {
453 fputs(set, file);
454 if (!nofirst)
455 fputc(first, file);
456 fwrite(line, len, 1, file);
457 fputs(reset, file);
458 }
459 if (has_trailing_carriage_return)
460 fputc('\r', file);
461 if (has_trailing_newline)
462 fputc('\n', file);
463}
464static void emit_line(struct diff_options *o, const char *set, const char *reset,
466 const char *line, int len)
467{
468 emit_line_0(o, set, reset, line[0], line+1, len-1);
469}
470static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
472{
473 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
474 ecbdata->blank_at_eof_in_preimage &&
475 ecbdata->blank_at_eof_in_postimage &&
476 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
477 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
478 return 0;
479 return ws_blank_line(line, len, ecbdata->ws_rule);
480}
481static void emit_line_checked(const char *reset,
483 struct emit_callback *ecbdata,
484 const char *line, int len,
485 enum color_diff color,
486 unsigned ws_error_highlight,
487 char sign)
488{
489 const char *set = diff_get_color(ecbdata->color_diff, color);
490 const char *ws = NULL;
491 if (ecbdata->opt->ws_error_highlight & ws_error_highlight) {
493 ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
494 if (!*ws)
495 ws = NULL;
496 }
497 if (!ws)
499 emit_line_0(ecbdata->opt, set, reset, sign, line, len);
500 else if (sign == '+' && new_blank_line_at_eof(ecbdata, line, len))
501 /* Blank line at EOF - paint '+' as well */
502 emit_line_0(ecbdata->opt, ws, reset, sign, line, len);
503 else {
504 /* Emit just the prefix, then the rest. */
505 emit_line_0(ecbdata->opt, set, reset, sign, "", 0);
506 ws_check_emit(line, len, ecbdata->ws_rule,
507 ecbdata->opt->file, set, reset, ws);
508 }
509}
510static void emit_add_line(const char *reset,
512 struct emit_callback *ecbdata,
513 const char *line, int len)
514{
515 emit_line_checked(reset, ecbdata, line, len,
516 DIFF_FILE_NEW, WSEH_NEW, '+');
517}
518static void emit_del_line(const char *reset,
520 struct emit_callback *ecbdata,
521 const char *line, int len)
522{
523 emit_line_checked(reset, ecbdata, line, len,
524 DIFF_FILE_OLD, WSEH_OLD, '-');
525}
526static void emit_context_line(const char *reset,
528 struct emit_callback *ecbdata,
529 const char *line, int len)
530{
531 emit_line_checked(reset, ecbdata, line, len,
532 DIFF_CONTEXT, WSEH_CONTEXT, ' ');
533}
534static void emit_hunk_header(struct emit_callback *ecbdata,
536 const char *line, int len)
537{
538 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
539 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
540 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
541 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
542 static const char atat[2] = { '@', '@' };
543 const char *cp, *ep;
544 struct strbuf msgbuf = STRBUF_INIT;
545 int org_len = len;
546 int i = 1;
547 /*
549 * As a hunk header must begin with "@@ -<old>, +<new> @@",
550 * it always is at least 10 bytes long.
551 */
552 if (len < 10 ||
553 memcmp(line, atat, 2) ||
554 !(ep = memmem(line + 2, len - 2, atat, 2))) {
555 emit_line(ecbdata->opt, context, reset, line, len);
556 return;
557 }
558 ep += 2; /* skip over @@ */
559 /* The hunk header in fraginfo color */
561 strbuf_addstr(&msgbuf, frag);
562 strbuf_add(&msgbuf, line, ep - line);
563 strbuf_addstr(&msgbuf, reset);
564 /*
566 * trailing "\r\n"
567 */
568 for ( ; i < 3; i++)
569 if (line[len - i] == '\r' || line[len - i] == '\n')
570 len--;
571 /* blank before the func header */
573 for (cp = ep; ep - line < len; ep++)
574 if (*ep != ' ' && *ep != '\t')
575 break;
576 if (ep != cp) {
577 strbuf_addstr(&msgbuf, context);
578 strbuf_add(&msgbuf, cp, ep - cp);
579 strbuf_addstr(&msgbuf, reset);
580 }
581 if (ep < line + len) {
583 strbuf_addstr(&msgbuf, func);
584 strbuf_add(&msgbuf, ep, line + len - ep);
585 strbuf_addstr(&msgbuf, reset);
586 }
587 strbuf_add(&msgbuf, line + len, org_len - len);
589 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
590 strbuf_release(&msgbuf);
591}
592static struct diff_tempfile *claim_diff_tempfile(void) {
594 int i;
595 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
596 if (!diff_temp[i].name)
597 return diff_temp + i;
598 die("BUG: diff is failing to clean up its tempfiles");
599}
600static int remove_tempfile_installed;
602static void remove_tempfile(void)
604{
605 int i;
606 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
607 if (diff_temp[i].name == diff_temp[i].tmp_path)
608 unlink_or_warn(diff_temp[i].name);
609 diff_temp[i].name = NULL;
610 }
611}
612static void remove_tempfile_on_signal(int signo)
614{
615 remove_tempfile();
616 sigchain_pop(signo);
617 raise(signo);
618}
619static void print_line_count(FILE *file, int count)
621{
622 switch (count) {
623 case 0:
624 fprintf(file, "0,0");
625 break;
626 case 1:
627 fprintf(file, "1");
628 break;
629 default:
630 fprintf(file, "1,%d", count);
631 break;
632 }
633}
634static void emit_rewrite_lines(struct emit_callback *ecb,
636 int prefix, const char *data, int size)
637{
638 const char *endp = NULL;
639 static const char *nneof = " No newline at end of file\n";
640 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
641 while (0 < size) {
643 int len;
644 endp = memchr(data, '\n', size);
646 len = endp ? (endp - data + 1) : size;
647 if (prefix != '+') {
648 ecb->lno_in_preimage++;
649 emit_del_line(reset, ecb, data, len);
650 } else {
651 ecb->lno_in_postimage++;
652 emit_add_line(reset, ecb, data, len);
653 }
654 size -= len;
655 data += len;
656 }
657 if (!endp) {
658 const char *context = diff_get_color(ecb->color_diff,
659 DIFF_CONTEXT);
660 putc('\n', ecb->opt->file);
661 emit_line_0(ecb->opt, context, reset, '\\',
662 nneof, strlen(nneof));
663 }
664}
665static void emit_rewrite_diff(const char *name_a,
667 const char *name_b,
668 struct diff_filespec *one,
669 struct diff_filespec *two,
670 struct userdiff_driver *textconv_one,
671 struct userdiff_driver *textconv_two,
672 struct diff_options *o)
673{
674 int lc_a, lc_b;
675 const char *name_a_tab, *name_b_tab;
676 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
677 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
678 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
679 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
680 const char *a_prefix, *b_prefix;
681 char *data_one, *data_two;
682 size_t size_one, size_two;
683 struct emit_callback ecbdata;
684 const char *line_prefix = diff_line_prefix(o);
685 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
687 a_prefix = o->b_prefix;
688 b_prefix = o->a_prefix;
689 } else {
690 a_prefix = o->a_prefix;
691 b_prefix = o->b_prefix;
692 }
693 name_a += (*name_a == '/');
695 name_b += (*name_b == '/');
696 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
697 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
698 strbuf_reset(&a_name);
700 strbuf_reset(&b_name);
701 quote_two_c_style(&a_name, a_prefix, name_a, 0);
702 quote_two_c_style(&b_name, b_prefix, name_b, 0);
703 size_one = fill_textconv(textconv_one, one, &data_one);
705 size_two = fill_textconv(textconv_two, two, &data_two);
706 memset(&ecbdata, 0, sizeof(ecbdata));
708 ecbdata.color_diff = want_color(o->use_color);
709 ecbdata.found_changesp = &o->found_changes;
710 ecbdata.ws_rule = whitespace_rule(name_b);
711 ecbdata.opt = o;
712 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
713 mmfile_t mf1, mf2;
714 mf1.ptr = (char *)data_one;
715 mf2.ptr = (char *)data_two;
716 mf1.size = size_one;
717 mf2.size = size_two;
718 check_blank_at_eof(&mf1, &mf2, &ecbdata);
719 }
720 ecbdata.lno_in_preimage = 1;
721 ecbdata.lno_in_postimage = 1;
722 lc_a = count_lines(data_one, size_one);
724 lc_b = count_lines(data_two, size_two);
725 fprintf(o->file,
726 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
727 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
728 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
729 line_prefix, fraginfo);
730 if (!o->irreversible_delete)
731 print_line_count(o->file, lc_a);
732 else
733 fprintf(o->file, "?,?");
734 fprintf(o->file, " +");
735 print_line_count(o->file, lc_b);
736 fprintf(o->file, " @@%s\n", reset);
737 if (lc_a && !o->irreversible_delete)
738 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
739 if (lc_b)
740 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
741 if (textconv_one)
742 free((char *)data_one);
743 if (textconv_two)
744 free((char *)data_two);
745}
746struct diff_words_buffer {
748 mmfile_t text;
749 long alloc;
750 struct diff_words_orig {
751 const char *begin, *end;
752 } *orig;
753 int orig_nr, orig_alloc;
754};
755static void diff_words_append(char *line, unsigned long len,
757 struct diff_words_buffer *buffer)
758{
759 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
760 line++;
761 len--;
762 memcpy(buffer->text.ptr + buffer->text.size, line, len);
763 buffer->text.size += len;
764 buffer->text.ptr[buffer->text.size] = '\0';
765}
766struct diff_words_style_elem {
768 const char *prefix;
769 const char *suffix;
770 const char *color; /* NULL; filled in by the setup code if
771 * color is enabled */
772};
773struct diff_words_style {
775 enum diff_words_type type;
776 struct diff_words_style_elem new, old, ctx;
777 const char *newline;
778};
779static struct diff_words_style diff_words_styles[] = {
781 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
782 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
783 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
784};
785struct diff_words_data {
787 struct diff_words_buffer minus, plus;
788 const char *current_plus;
789 int last_minus;
790 struct diff_options *opt;
791 regex_t *word_regex;
792 enum diff_words_type type;
793 struct diff_words_style *style;
794};
795static int fn_out_diff_words_write_helper(FILE *fp,
797 struct diff_words_style_elem *st_el,
798 const char *newline,
799 size_t count, const char *buf,
800 const char *line_prefix)
801{
802 int print = 0;
803 while (count) {
805 char *p = memchr(buf, '\n', count);
806 if (print)
807 fputs(line_prefix, fp);
808 if (p != buf) {
809 if (st_el->color && fputs(st_el->color, fp) < 0)
810 return -1;
811 if (fputs(st_el->prefix, fp) < 0 ||
812 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
813 fputs(st_el->suffix, fp) < 0)
814 return -1;
815 if (st_el->color && *st_el->color
816 && fputs(GIT_COLOR_RESET, fp) < 0)
817 return -1;
818 }
819 if (!p)
820 return 0;
821 if (fputs(newline, fp) < 0)
822 return -1;
823 count -= p + 1 - buf;
824 buf = p + 1;
825 print = 1;
826 }
827 return 0;
828}
829/*
831 * '--color-words' algorithm can be described as:
832 *
833 * 1. collect a the minus/plus lines of a diff hunk, divided into
834 * minus-lines and plus-lines;
835 *
836 * 2. break both minus-lines and plus-lines into words and
837 * place them into two mmfile_t with one word for each line;
838 *
839 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
840 *
841 * And for the common parts of the both file, we output the plus side text.
842 * diff_words->current_plus is used to trace the current position of the plus file
843 * which printed. diff_words->last_minus is used to trace the last minus word
844 * printed.
845 *
846 * For '--graph' to work with '--color-words', we need to output the graph prefix
847 * on each line of color words output. Generally, there are two conditions on
848 * which we should output the prefix.
849 *
850 * 1. diff_words->last_minus == 0 &&
851 * diff_words->current_plus == diff_words->plus.text.ptr
852 *
853 * that is: the plus text must start as a new line, and if there is no minus
854 * word printed, a graph prefix must be printed.
855 *
856 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
857 * *(diff_words->current_plus - 1) == '\n'
858 *
859 * that is: a graph prefix must be printed following a '\n'
860 */
861static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
862{
863 if ((diff_words->last_minus == 0 &&
864 diff_words->current_plus == diff_words->plus.text.ptr) ||
865 (diff_words->current_plus > diff_words->plus.text.ptr &&
866 *(diff_words->current_plus - 1) == '\n')) {
867 return 1;
868 } else {
869 return 0;
870 }
871}
872static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
874{
875 struct diff_words_data *diff_words = priv;
876 struct diff_words_style *style = diff_words->style;
877 int minus_first, minus_len, plus_first, plus_len;
878 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
879 struct diff_options *opt = diff_words->opt;
880 const char *line_prefix;
881 if (line[0] != '@' || parse_hunk_header(line, len,
883 &minus_first, &minus_len, &plus_first, &plus_len))
884 return;
885 assert(opt);
887 line_prefix = diff_line_prefix(opt);
888 /* POSIX requires that first be decremented by one if len == 0... */
890 if (minus_len) {
891 minus_begin = diff_words->minus.orig[minus_first].begin;
892 minus_end =
893 diff_words->minus.orig[minus_first + minus_len - 1].end;
894 } else
895 minus_begin = minus_end =
896 diff_words->minus.orig[minus_first].end;
897 if (plus_len) {
899 plus_begin = diff_words->plus.orig[plus_first].begin;
900 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
901 } else
902 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
903 if (color_words_output_graph_prefix(diff_words)) {
905 fputs(line_prefix, diff_words->opt->file);
906 }
907 if (diff_words->current_plus != plus_begin) {
908 fn_out_diff_words_write_helper(diff_words->opt->file,
909 &style->ctx, style->newline,
910 plus_begin - diff_words->current_plus,
911 diff_words->current_plus, line_prefix);
912 if (*(plus_begin - 1) == '\n')
913 fputs(line_prefix, diff_words->opt->file);
914 }
915 if (minus_begin != minus_end) {
916 fn_out_diff_words_write_helper(diff_words->opt->file,
917 &style->old, style->newline,
918 minus_end - minus_begin, minus_begin,
919 line_prefix);
920 }
921 if (plus_begin != plus_end) {
922 fn_out_diff_words_write_helper(diff_words->opt->file,
923 &style->new, style->newline,
924 plus_end - plus_begin, plus_begin,
925 line_prefix);
926 }
927 diff_words->current_plus = plus_end;
929 diff_words->last_minus = minus_first;
930}
931/* This function starts looking at *begin, and returns 0 iff a word was found. */
933static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
934 int *begin, int *end)
935{
936 if (word_regex && *begin < buffer->size) {
937 regmatch_t match[1];
938 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
939 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
940 '\n', match[0].rm_eo - match[0].rm_so);
941 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
942 *begin += match[0].rm_so;
943 return *begin >= *end;
944 }
945 return -1;
946 }
947 /* find the next word */
949 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
950 (*begin)++;
951 if (*begin >= buffer->size)
952 return -1;
953 /* find the end of the word */
955 *end = *begin + 1;
956 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
957 (*end)++;
958 return 0;
960}
961/*
963 * This function splits the words in buffer->text, stores the list with
964 * newline separator into out, and saves the offsets of the original words
965 * in buffer->orig.
966 */
967static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
968 regex_t *word_regex)
969{
970 int i, j;
971 long alloc = 0;
972 out->size = 0;
974 out->ptr = NULL;
975 /* fake an empty "0th" word */
977 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
978 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
979 buffer->orig_nr = 1;
980 for (i = 0; i < buffer->text.size; i++) {
982 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
983 return;
984 /* store original boundaries */
986 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
987 buffer->orig_alloc);
988 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
989 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
990 buffer->orig_nr++;
991 /* store one word */
993 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
994 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
995 out->ptr[out->size + j - i] = '\n';
996 out->size += j - i + 1;
997 i = j - 1;
999 }
1000}
1001/* this executes the word diff on the accumulated buffers */
1003static void diff_words_show(struct diff_words_data *diff_words)
1004{
1005 xpparam_t xpp;
1006 xdemitconf_t xecfg;
1007 mmfile_t minus, plus;
1008 struct diff_words_style *style = diff_words->style;
1009 struct diff_options *opt = diff_words->opt;
1011 const char *line_prefix;
1012 assert(opt);
1014 line_prefix = diff_line_prefix(opt);
1015 /* special case: only removal */
1017 if (!diff_words->plus.text.size) {
1018 fputs(line_prefix, diff_words->opt->file);
1019 fn_out_diff_words_write_helper(diff_words->opt->file,
1020 &style->old, style->newline,
1021 diff_words->minus.text.size,
1022 diff_words->minus.text.ptr, line_prefix);
1023 diff_words->minus.text.size = 0;
1024 return;
1025 }
1026 diff_words->current_plus = diff_words->plus.text.ptr;
1028 diff_words->last_minus = 0;
1029 memset(&xpp, 0, sizeof(xpp));
1031 memset(&xecfg, 0, sizeof(xecfg));
1032 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1033 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1034 xpp.flags = 0;
1035 /* as only the hunk header will be parsed, we need a 0-context */
1036 xecfg.ctxlen = 0;
1037 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1038 &xpp, &xecfg);
1039 free(minus.ptr);
1040 free(plus.ptr);
1041 if (diff_words->current_plus != diff_words->plus.text.ptr +
1042 diff_words->plus.text.size) {
1043 if (color_words_output_graph_prefix(diff_words))
1044 fputs(line_prefix, diff_words->opt->file);
1045 fn_out_diff_words_write_helper(diff_words->opt->file,
1046 &style->ctx, style->newline,
1047 diff_words->plus.text.ptr + diff_words->plus.text.size
1048 - diff_words->current_plus, diff_words->current_plus,
1049 line_prefix);
1050 }
1051 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1052}
1053/* In "color-words" mode, show word-diff of words accumulated in the buffer */
1055static void diff_words_flush(struct emit_callback *ecbdata)
1056{
1057 if (ecbdata->diff_words->minus.text.size ||
1058 ecbdata->diff_words->plus.text.size)
1059 diff_words_show(ecbdata->diff_words);
1060}
1061static void diff_filespec_load_driver(struct diff_filespec *one)
1063{
1064 /* Use already-loaded driver */
1065 if (one->driver)
1066 return;
1067 if (S_ISREG(one->mode))
1069 one->driver = userdiff_find_by_path(one->path);
1070 /* Fallback to default settings */
1072 if (!one->driver)
1073 one->driver = userdiff_find_by_name("default");
1074}
1075static const char *userdiff_word_regex(struct diff_filespec *one)
1077{
1078 diff_filespec_load_driver(one);
1079 return one->driver->word_regex;
1080}
1081static void init_diff_words_data(struct emit_callback *ecbdata,
1083 struct diff_options *orig_opts,
1084 struct diff_filespec *one,
1085 struct diff_filespec *two)
1086{
1087 int i;
1088 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1089 memcpy(o, orig_opts, sizeof(struct diff_options));
1090 ecbdata->diff_words =
1092 xcalloc(1, sizeof(struct diff_words_data));
1093 ecbdata->diff_words->type = o->word_diff;
1094 ecbdata->diff_words->opt = o;
1095 if (!o->word_regex)
1096 o->word_regex = userdiff_word_regex(one);
1097 if (!o->word_regex)
1098 o->word_regex = userdiff_word_regex(two);
1099 if (!o->word_regex)
1100 o->word_regex = diff_word_regex_cfg;
1101 if (o->word_regex) {
1102 ecbdata->diff_words->word_regex = (regex_t *)
1103 xmalloc(sizeof(regex_t));
1104 if (regcomp(ecbdata->diff_words->word_regex,
1105 o->word_regex,
1106 REG_EXTENDED | REG_NEWLINE))
1107 die ("Invalid regular expression: %s",
1108 o->word_regex);
1109 }
1110 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1111 if (o->word_diff == diff_words_styles[i].type) {
1112 ecbdata->diff_words->style =
1113 &diff_words_styles[i];
1114 break;
1115 }
1116 }
1117 if (want_color(o->use_color)) {
1118 struct diff_words_style *st = ecbdata->diff_words->style;
1119 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1120 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1121 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1122 }
1123}
1124static void free_diff_words_data(struct emit_callback *ecbdata)
1126{
1127 if (ecbdata->diff_words) {
1128 diff_words_flush(ecbdata);
1129 free (ecbdata->diff_words->opt);
1130 free (ecbdata->diff_words->minus.text.ptr);
1131 free (ecbdata->diff_words->minus.orig);
1132 free (ecbdata->diff_words->plus.text.ptr);
1133 free (ecbdata->diff_words->plus.orig);
1134 if (ecbdata->diff_words->word_regex) {
1135 regfree(ecbdata->diff_words->word_regex);
1136 free(ecbdata->diff_words->word_regex);
1137 }
1138 free(ecbdata->diff_words);
1139 ecbdata->diff_words = NULL;
1140 }
1141}
1142const char *diff_get_color(int diff_use_color, enum color_diff ix)
1144{
1145 if (want_color(diff_use_color))
1146 return diff_colors[ix];
1147 return "";
1148}
1149const char *diff_line_prefix(struct diff_options *opt)
1151{
1152 struct strbuf *msgbuf;
1153 if (!opt->output_prefix)
1154 return "";
1155 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1157 return msgbuf->buf;
1158}
1159static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1161{
1162 const char *cp;
1163 unsigned long allot;
1164 size_t l = len;
1165 if (ecb->truncate)
1167 return ecb->truncate(line, len);
1168 cp = line;
1169 allot = l;
1170 while (0 < l) {
1171 (void) utf8_width(&cp, &l);
1172 if (!cp)
1173 break; /* truncated in the middle? */
1174 }
1175 return allot - l;
1176}
1177static void find_lno(const char *line, struct emit_callback *ecbdata)
1179{
1180 const char *p;
1181 ecbdata->lno_in_preimage = 0;
1182 ecbdata->lno_in_postimage = 0;
1183 p = strchr(line, '-');
1184 if (!p)
1185 return; /* cannot happen */
1186 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1187 p = strchr(p, '+');
1188 if (!p)
1189 return; /* cannot happen */
1190 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1191}
1192static void fn_out_consume(void *priv, char *line, unsigned long len)
1194{
1195 struct emit_callback *ecbdata = priv;
1196 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1197 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1198 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1199 struct diff_options *o = ecbdata->opt;
1200 const char *line_prefix = diff_line_prefix(o);
1201 if (ecbdata->header) {
1203 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1204 strbuf_reset(ecbdata->header);
1205 ecbdata->header = NULL;
1206 }
1207 *(ecbdata->found_changesp) = 1;
1208 if (ecbdata->label_path[0]) {
1210 const char *name_a_tab, *name_b_tab;
1211 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1213 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1214 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1216 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1217 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1218 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1219 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1220 }
1221 if (diff_suppress_blank_empty
1223 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1224 line[0] = '\n';
1225 len = 1;
1226 }
1227 if (line[0] == '@') {
1229 if (ecbdata->diff_words)
1230 diff_words_flush(ecbdata);
1231 len = sane_truncate_line(ecbdata, line, len);
1232 find_lno(line, ecbdata);
1233 emit_hunk_header(ecbdata, line, len);
1234 if (line[len-1] != '\n')
1235 putc('\n', ecbdata->opt->file);
1236 return;
1237 }
1238 if (len < 1) {
1240 emit_line(ecbdata->opt, reset, reset, line, len);
1241 if (ecbdata->diff_words
1242 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1243 fputs("~\n", ecbdata->opt->file);
1244 return;
1245 }
1246 if (ecbdata->diff_words) {
1248 if (line[0] == '-') {
1249 diff_words_append(line, len,
1250 &ecbdata->diff_words->minus);
1251 return;
1252 } else if (line[0] == '+') {
1253 diff_words_append(line, len,
1254 &ecbdata->diff_words->plus);
1255 return;
1256 } else if (starts_with(line, "\\ ")) {
1257 /*
1258 * Eat the "no newline at eof" marker as if we
1259 * saw a "+" or "-" line with nothing on it,
1260 * and return without diff_words_flush() to
1261 * defer processing. If this is the end of
1262 * preimage, more "+" lines may come after it.
1263 */
1264 return;
1265 }
1266 diff_words_flush(ecbdata);
1267 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1268 emit_line(ecbdata->opt, context, reset, line, len);
1269 fputs("~\n", ecbdata->opt->file);
1270 } else {
1271 /*
1272 * Skip the prefix character, if any. With
1273 * diff_suppress_blank_empty, there may be
1274 * none.
1275 */
1276 if (line[0] != '\n') {
1277 line++;
1278 len--;
1279 }
1280 emit_line(ecbdata->opt, context, reset, line, len);
1281 }
1282 return;
1283 }
1284 switch (line[0]) {
1286 case '+':
1287 ecbdata->lno_in_postimage++;
1288 emit_add_line(reset, ecbdata, line + 1, len - 1);
1289 break;
1290 case '-':
1291 ecbdata->lno_in_preimage++;
1292 emit_del_line(reset, ecbdata, line + 1, len - 1);
1293 break;
1294 case ' ':
1295 ecbdata->lno_in_postimage++;
1296 ecbdata->lno_in_preimage++;
1297 emit_context_line(reset, ecbdata, line + 1, len - 1);
1298 break;
1299 default:
1300 /* incomplete line at the end */
1301 ecbdata->lno_in_preimage++;
1302 emit_line(ecbdata->opt,
1303 diff_get_color(ecbdata->color_diff, DIFF_CONTEXT),
1304 reset, line, len);
1305 break;
1306 }
1307}
1308static char *pprint_rename(const char *a, const char *b)
1310{
1311 const char *old = a;
1312 const char *new = b;
1313 struct strbuf name = STRBUF_INIT;
1314 int pfx_length, sfx_length;
1315 int pfx_adjust_for_slash;
1316 int len_a = strlen(a);
1317 int len_b = strlen(b);
1318 int a_midlen, b_midlen;
1319 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1320 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1321 if (qlen_a || qlen_b) {
1323 quote_c_style(a, &name, NULL, 0);
1324 strbuf_addstr(&name, " => ");
1325 quote_c_style(b, &name, NULL, 0);
1326 return strbuf_detach(&name, NULL);
1327 }
1328 /* Find common prefix */
1330 pfx_length = 0;
1331 while (*old && *new && *old == *new) {
1332 if (*old == '/')
1333 pfx_length = old - a + 1;
1334 old++;
1335 new++;
1336 }
1337 /* Find common suffix */
1339 old = a + len_a;
1340 new = b + len_b;
1341 sfx_length = 0;
1342 /*
1343 * If there is a common prefix, it must end in a slash. In
1344 * that case we let this loop run 1 into the prefix to see the
1345 * same slash.
1346 *
1347 * If there is no common prefix, we cannot do this as it would
1348 * underrun the input strings.
1349 */
1350 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1351 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1352 b + pfx_length - pfx_adjust_for_slash <= new &&
1353 *old == *new) {
1354 if (*old == '/')
1355 sfx_length = len_a - (old - a);
1356 old--;
1357 new--;
1358 }
1359 /*
1361 * pfx{mid-a => mid-b}sfx
1362 * {pfx-a => pfx-b}sfx
1363 * pfx{sfx-a => sfx-b}
1364 * name-a => name-b
1365 */
1366 a_midlen = len_a - pfx_length - sfx_length;
1367 b_midlen = len_b - pfx_length - sfx_length;
1368 if (a_midlen < 0)
1369 a_midlen = 0;
1370 if (b_midlen < 0)
1371 b_midlen = 0;
1372 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1374 if (pfx_length + sfx_length) {
1375 strbuf_add(&name, a, pfx_length);
1376 strbuf_addch(&name, '{');
1377 }
1378 strbuf_add(&name, a + pfx_length, a_midlen);
1379 strbuf_addstr(&name, " => ");
1380 strbuf_add(&name, b + pfx_length, b_midlen);
1381 if (pfx_length + sfx_length) {
1382 strbuf_addch(&name, '}');
1383 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1384 }
1385 return strbuf_detach(&name, NULL);
1386}
1387struct diffstat_t {
1389 int nr;
1390 int alloc;
1391 struct diffstat_file {
1392 char *from_name;
1393 char *name;
1394 char *print_name;
1395 unsigned is_unmerged:1;
1396 unsigned is_binary:1;
1397 unsigned is_renamed:1;
1398 unsigned is_interesting:1;
1399 uintmax_t added, deleted;
1400 } **files;
1401};
1402static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1404 const char *name_a,
1405 const char *name_b)
1406{
1407 struct diffstat_file *x;
1408 x = xcalloc(1, sizeof(*x));
1409 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1410 diffstat->files[diffstat->nr++] = x;
1411 if (name_b) {
1412 x->from_name = xstrdup(name_a);
1413 x->name = xstrdup(name_b);
1414 x->is_renamed = 1;
1415 }
1416 else {
1417 x->from_name = NULL;
1418 x->name = xstrdup(name_a);
1419 }
1420 return x;
1421}
1422static void diffstat_consume(void *priv, char *line, unsigned long len)
1424{
1425 struct diffstat_t *diffstat = priv;
1426 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1427 if (line[0] == '+')
1429 x->added++;
1430 else if (line[0] == '-')
1431 x->deleted++;
1432}
1433const char mime_boundary_leader[] = "------------";
1435static int scale_linear(int it, int width, int max_change)
1437{
1438 if (!it)
1439 return 0;
1440 /*
1441 * make sure that at least one '-' or '+' is printed if
1442 * there is any change to this path. The easiest way is to
1443 * scale linearly as if the alloted width is one column shorter
1444 * than it is, and then add 1 to the result.
1445 */
1446 return 1 + (it * (width - 1) / max_change);
1447}
1448static void show_name(FILE *file,
1450 const char *prefix, const char *name, int len)
1451{
1452 fprintf(file, " %s%-*s |", prefix, len, name);
1453}
1454static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1456{
1457 if (cnt <= 0)
1458 return;
1459 fprintf(file, "%s", set);
1460 while (cnt--)
1461 putc(ch, file);
1462 fprintf(file, "%s", reset);
1463}
1464static void fill_print_name(struct diffstat_file *file)
1466{
1467 char *pname;
1468 if (file->print_name)
1470 return;
1471 if (!file->is_renamed) {
1473 struct strbuf buf = STRBUF_INIT;
1474 if (quote_c_style(file->name, &buf, NULL, 0)) {
1475 pname = strbuf_detach(&buf, NULL);
1476 } else {
1477 pname = file->name;
1478 strbuf_release(&buf);
1479 }
1480 } else {
1481 pname = pprint_rename(file->from_name, file->name);
1482 }
1483 file->print_name = pname;
1484}
1485int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1487{
1488 struct strbuf sb = STRBUF_INIT;
1489 int ret;
1490 if (!files) {
1492 assert(insertions == 0 && deletions == 0);
1493 return fprintf(fp, "%s\n", " 0 files changed");
1494 }
1495 strbuf_addf(&sb,
1497 (files == 1) ? " %d file changed" : " %d files changed",
1498 files);
1499 /*
1501 * For binary diff, the caller may want to print "x files
1502 * changed" with insertions == 0 && deletions == 0.
1503 *
1504 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1505 * is probably less confusing (i.e skip over "2 files changed
1506 * but nothing about added/removed lines? Is this a bug in Git?").
1507 */
1508 if (insertions || deletions == 0) {
1509 strbuf_addf(&sb,
1510 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1511 insertions);
1512 }
1513 if (deletions || insertions == 0) {
1515 strbuf_addf(&sb,
1516 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1517 deletions);
1518 }
1519 strbuf_addch(&sb, '\n');
1520 ret = fputs(sb.buf, fp);
1521 strbuf_release(&sb);
1522 return ret;
1523}
1524static void show_stats(struct diffstat_t *data, struct diff_options *options)
1526{
1527 int i, len, add, del, adds = 0, dels = 0;
1528 uintmax_t max_change = 0, max_len = 0;
1529 int total_files = data->nr, count;
1530 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1531 const char *reset, *add_c, *del_c;
1532 const char *line_prefix = "";
1533 int extra_shown = 0;
1534 if (data->nr == 0)
1536 return;
1537 line_prefix = diff_line_prefix(options);
1539 count = options->stat_count ? options->stat_count : data->nr;
1540 reset = diff_get_color_opt(options, DIFF_RESET);
1542 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1543 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1544 /*
1546 * Find the longest filename and max number of changes
1547 */
1548 for (i = 0; (i < count) && (i < data->nr); i++) {
1549 struct diffstat_file *file = data->files[i];
1550 uintmax_t change = file->added + file->deleted;
1551 if (!file->is_interesting && (change == 0)) {
1553 count++; /* not shown == room for one more */
1554 continue;
1555 }
1556 fill_print_name(file);
1557 len = strlen(file->print_name);
1558 if (max_len < len)
1559 max_len = len;
1560 if (file->is_unmerged) {
1562 /* "Unmerged" is 8 characters */
1563 bin_width = bin_width < 8 ? 8 : bin_width;
1564 continue;
1565 }
1566 if (file->is_binary) {
1567 /* "Bin XXX -> YYY bytes" */
1568 int w = 14 + decimal_width(file->added)
1569 + decimal_width(file->deleted);
1570 bin_width = bin_width < w ? w : bin_width;
1571 /* Display change counts aligned with "Bin" */
1572 number_width = 3;
1573 continue;
1574 }
1575 if (max_change < change)
1577 max_change = change;
1578 }
1579 count = i; /* where we can stop scanning in data->files[] */
1580 /*
1582 * We have width = stat_width or term_columns() columns total.
1583 * We want a maximum of min(max_len, stat_name_width) for the name part.
1584 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1585 * We also need 1 for " " and 4 + decimal_width(max_change)
1586 * for " | NNNN " and one the empty column at the end, altogether
1587 * 6 + decimal_width(max_change).
1588 *
1589 * If there's not enough space, we will use the smaller of
1590 * stat_name_width (if set) and 5/8*width for the filename,
1591 * and the rest for constant elements + graph part, but no more
1592 * than stat_graph_width for the graph part.
1593 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1594 * for the standard terminal size).
1595 *
1596 * In other words: stat_width limits the maximum width, and
1597 * stat_name_width fixes the maximum width of the filename,
1598 * and is also used to divide available columns if there
1599 * aren't enough.
1600 *
1601 * Binary files are displayed with "Bin XXX -> YYY bytes"
1602 * instead of the change count and graph. This part is treated
1603 * similarly to the graph part, except that it is not
1604 * "scaled". If total width is too small to accommodate the
1605 * guaranteed minimum width of the filename part and the
1606 * separators and this message, this message will "overflow"
1607 * making the line longer than the maximum width.
1608 */
1609 if (options->stat_width == -1)
1611 width = term_columns() - options->output_prefix_length;
1612 else
1613 width = options->stat_width ? options->stat_width : 80;
1614 number_width = decimal_width(max_change) > number_width ?
1615 decimal_width(max_change) : number_width;
1616 if (options->stat_graph_width == -1)
1618 options->stat_graph_width = diff_stat_graph_width;
1619 /*
1621 * Guarantee 3/8*16==6 for the graph part
1622 * and 5/8*16==10 for the filename part
1623 */
1624 if (width < 16 + 6 + number_width)
1625 width = 16 + 6 + number_width;
1626 /*
1628 * First assign sizes that are wanted, ignoring available width.
1629 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1630 * starting from "XXX" should fit in graph_width.
1631 */
1632 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1633 if (options->stat_graph_width &&
1634 options->stat_graph_width < graph_width)
1635 graph_width = options->stat_graph_width;
1636 name_width = (options->stat_name_width > 0 &&
1638 options->stat_name_width < max_len) ?
1639 options->stat_name_width : max_len;
1640 /*
1642 * Adjust adjustable widths not to exceed maximum width
1643 */
1644 if (name_width + number_width + 6 + graph_width > width) {
1645 if (graph_width > width * 3/8 - number_width - 6) {
1646 graph_width = width * 3/8 - number_width - 6;
1647 if (graph_width < 6)
1648 graph_width = 6;
1649 }
1650 if (options->stat_graph_width &&
1652 graph_width > options->stat_graph_width)
1653 graph_width = options->stat_graph_width;
1654 if (name_width > width - number_width - 6 - graph_width)
1655 name_width = width - number_width - 6 - graph_width;
1656 else
1657 graph_width = width - number_width - 6 - name_width;
1658 }
1659 /*
1661 * From here name_width is the width of the name area,
1662 * and graph_width is the width of the graph area.
1663 * max_change is used to scale graph properly.
1664 */
1665 for (i = 0; i < count; i++) {
1666 const char *prefix = "";
1667 struct diffstat_file *file = data->files[i];
1668 char *name = file->print_name;
1669 uintmax_t added = file->added;
1670 uintmax_t deleted = file->deleted;
1671 int name_len;
1672 if (!file->is_interesting && (added + deleted == 0))
1674 continue;
1675 /*
1677 * "scale" the filename
1678 */
1679 len = name_width;
1680 name_len = strlen(name);
1681 if (name_width < name_len) {
1682 char *slash;
1683 prefix = "...";
1684 len -= 3;
1685 name += name_len - len;
1686 slash = strchr(name, '/');
1687 if (slash)
1688 name = slash;
1689 }
1690 if (file->is_binary) {
1692 fprintf(options->file, "%s", line_prefix);
1693 show_name(options->file, prefix, name, len);
1694 fprintf(options->file, " %*s", number_width, "Bin");
1695 if (!added && !deleted) {
1696 putc('\n', options->file);
1697 continue;
1698 }
1699 fprintf(options->file, " %s%"PRIuMAX"%s",
1700 del_c, deleted, reset);
1701 fprintf(options->file, " -> ");
1702 fprintf(options->file, "%s%"PRIuMAX"%s",
1703 add_c, added, reset);
1704 fprintf(options->file, " bytes");
1705 fprintf(options->file, "\n");
1706 continue;
1707 }
1708 else if (file->is_unmerged) {
1709 fprintf(options->file, "%s", line_prefix);
1710 show_name(options->file, prefix, name, len);
1711 fprintf(options->file, " Unmerged\n");
1712 continue;
1713 }
1714 /*
1716 * scale the add/delete
1717 */
1718 add = added;
1719 del = deleted;
1720 if (graph_width <= max_change) {
1722 int total = scale_linear(add + del, graph_width, max_change);
1723 if (total < 2 && add && del)
1724 /* width >= 2 due to the sanity check */
1725 total = 2;
1726 if (add < del) {
1727 add = scale_linear(add, graph_width, max_change);
1728 del = total - add;
1729 } else {
1730 del = scale_linear(del, graph_width, max_change);
1731 add = total - del;
1732 }
1733 }
1734 fprintf(options->file, "%s", line_prefix);
1735 show_name(options->file, prefix, name, len);
1736 fprintf(options->file, " %*"PRIuMAX"%s",
1737 number_width, added + deleted,
1738 added + deleted ? " " : "");
1739 show_graph(options->file, '+', add, add_c, reset);
1740 show_graph(options->file, '-', del, del_c, reset);
1741 fprintf(options->file, "\n");
1742 }
1743 for (i = 0; i < data->nr; i++) {
1745 struct diffstat_file *file = data->files[i];
1746 uintmax_t added = file->added;
1747 uintmax_t deleted = file->deleted;
1748 if (file->is_unmerged ||
1750 (!file->is_interesting && (added + deleted == 0))) {
1751 total_files--;
1752 continue;
1753 }
1754 if (!file->is_binary) {
1756 adds += added;
1757 dels += deleted;
1758 }
1759 if (i < count)
1760 continue;
1761 if (!extra_shown)
1762 fprintf(options->file, "%s ...\n", line_prefix);
1763 extra_shown = 1;
1764 }
1765 fprintf(options->file, "%s", line_prefix);
1766 print_stat_summary(options->file, total_files, adds, dels);
1767}
1768static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1770{
1771 int i, adds = 0, dels = 0, total_files = data->nr;
1772 if (data->nr == 0)
1774 return;
1775 for (i = 0; i < data->nr; i++) {
1777 int added = data->files[i]->added;
1778 int deleted= data->files[i]->deleted;
1779 if (data->files[i]->is_unmerged ||
1781 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1782 total_files--;
1783 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1784 adds += added;
1785 dels += deleted;
1786 }
1787 }
1788 fprintf(options->file, "%s", diff_line_prefix(options));
1789 print_stat_summary(options->file, total_files, adds, dels);
1790}
1791static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1793{
1794 int i;
1795 if (data->nr == 0)
1797 return;
1798 for (i = 0; i < data->nr; i++) {
1800 struct diffstat_file *file = data->files[i];
1801 fprintf(options->file, "%s", diff_line_prefix(options));
1803 if (file->is_binary)
1805 fprintf(options->file, "-\t-\t");
1806 else
1807 fprintf(options->file,
1808 "%"PRIuMAX"\t%"PRIuMAX"\t",
1809 file->added, file->deleted);
1810 if (options->line_termination) {
1811 fill_print_name(file);
1812 if (!file->is_renamed)
1813 write_name_quoted(file->name, options->file,
1814 options->line_termination);
1815 else {
1816 fputs(file->print_name, options->file);
1817 putc(options->line_termination, options->file);
1818 }
1819 } else {
1820 if (file->is_renamed) {
1821 putc('\0', options->file);
1822 write_name_quoted(file->from_name, options->file, '\0');
1823 }
1824 write_name_quoted(file->name, options->file, '\0');
1825 }
1826 }
1827}
1828struct dirstat_file {
1830 const char *name;
1831 unsigned long changed;
1832};
1833struct dirstat_dir {
1835 struct dirstat_file *files;
1836 int alloc, nr, permille, cumulative;
1837};
1838static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1840 unsigned long changed, const char *base, int baselen)
1841{
1842 unsigned long this_dir = 0;
1843 unsigned int sources = 0;
1844 const char *line_prefix = diff_line_prefix(opt);
1845 while (dir->nr) {
1847 struct dirstat_file *f = dir->files;
1848 int namelen = strlen(f->name);
1849 unsigned long this;
1850 char *slash;
1851 if (namelen < baselen)
1853 break;
1854 if (memcmp(f->name, base, baselen))
1855 break;
1856 slash = strchr(f->name + baselen, '/');
1857 if (slash) {
1858 int newbaselen = slash + 1 - f->name;
1859 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1860 sources++;
1861 } else {
1862 this = f->changed;
1863 dir->files++;
1864 dir->nr--;
1865 sources += 2;
1866 }
1867 this_dir += this;
1868 }
1869 /*
1871 * We don't report dirstat's for
1872 * - the top level
1873 * - or cases where everything came from a single directory
1874 * under this directory (sources == 1).
1875 */
1876 if (baselen && sources != 1) {
1877 if (this_dir) {
1878 int permille = this_dir * 1000 / changed;
1879 if (permille >= dir->permille) {
1880 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1881 permille / 10, permille % 10, baselen, base);
1882 if (!dir->cumulative)
1883 return 0;
1884 }
1885 }
1886 }
1887 return this_dir;
1888}
1889static int dirstat_compare(const void *_a, const void *_b)
1891{
1892 const struct dirstat_file *a = _a;
1893 const struct dirstat_file *b = _b;
1894 return strcmp(a->name, b->name);
1895}
1896static void show_dirstat(struct diff_options *options)
1898{
1899 int i;
1900 unsigned long changed;
1901 struct dirstat_dir dir;
1902 struct diff_queue_struct *q = &diff_queued_diff;
1903 dir.files = NULL;
1905 dir.alloc = 0;
1906 dir.nr = 0;
1907 dir.permille = options->dirstat_permille;
1908 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1909 changed = 0;
1911 for (i = 0; i < q->nr; i++) {
1912 struct diff_filepair *p = q->queue[i];
1913 const char *name;
1914 unsigned long copied, added, damage;
1915 int content_changed;
1916 name = p->two->path ? p->two->path : p->one->path;
1918 if (p->one->sha1_valid && p->two->sha1_valid)
1920 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1921 else
1922 content_changed = 1;
1923 if (!content_changed) {
1925 /*
1926 * The SHA1 has not changed, so pre-/post-content is
1927 * identical. We can therefore skip looking at the
1928 * file contents altogether.
1929 */
1930 damage = 0;
1931 goto found_damage;
1932 }
1933 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1935 /*
1936 * In --dirstat-by-file mode, we don't really need to
1937 * look at the actual file contents at all.
1938 * The fact that the SHA1 changed is enough for us to
1939 * add this file to the list of results
1940 * (with each file contributing equal damage).
1941 */
1942 damage = 1;
1943 goto found_damage;
1944 }
1945 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1947 diff_populate_filespec(p->one, 0);
1948 diff_populate_filespec(p->two, 0);
1949 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1950 &copied, &added);
1951 diff_free_filespec_data(p->one);
1952 diff_free_filespec_data(p->two);
1953 } else if (DIFF_FILE_VALID(p->one)) {
1954 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
1955 copied = added = 0;
1956 diff_free_filespec_data(p->one);
1957 } else if (DIFF_FILE_VALID(p->two)) {
1958 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
1959 copied = 0;
1960 added = p->two->size;
1961 diff_free_filespec_data(p->two);
1962 } else
1963 continue;
1964 /*
1966 * Original minus copied is the removed material,
1967 * added is the new material. They are both damages
1968 * made to the preimage.
1969 * If the resulting damage is zero, we know that
1970 * diffcore_count_changes() considers the two entries to
1971 * be identical, but since content_changed is true, we
1972 * know that there must have been _some_ kind of change,
1973 * so we force all entries to have damage > 0.
1974 */
1975 damage = (p->one->size - copied) + added;
1976 if (!damage)
1977 damage = 1;
1978found_damage:
1980 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1981 dir.files[dir.nr].name = name;
1982 dir.files[dir.nr].changed = damage;
1983 changed += damage;
1984 dir.nr++;
1985 }
1986 /* This can happen even with many files, if everything was renames */
1988 if (!changed)
1989 return;
1990 /* Show all directories with more than x% of the changes */
1992 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1993 gather_dirstat(options, &dir, changed, "", 0);
1994}
1995static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1997{
1998 int i;
1999 unsigned long changed;
2000 struct dirstat_dir dir;
2001 if (data->nr == 0)
2003 return;
2004 dir.files = NULL;
2006 dir.alloc = 0;
2007 dir.nr = 0;
2008 dir.permille = options->dirstat_permille;
2009 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2010 changed = 0;
2012 for (i = 0; i < data->nr; i++) {
2013 struct diffstat_file *file = data->files[i];
2014 unsigned long damage = file->added + file->deleted;
2015 if (file->is_binary)
2016 /*
2017 * binary files counts bytes, not lines. Must find some
2018 * way to normalize binary bytes vs. textual lines.
2019 * The following heuristic assumes that there are 64
2020 * bytes per "line".
2021 * This is stupid and ugly, but very cheap...
2022 */
2023 damage = (damage + 63) / 64;
2024 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2025 dir.files[dir.nr].name = file->name;
2026 dir.files[dir.nr].changed = damage;
2027 changed += damage;
2028 dir.nr++;
2029 }
2030 /* This can happen even with many files, if everything was renames */
2032 if (!changed)
2033 return;
2034 /* Show all directories with more than x% of the changes */
2036 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2037 gather_dirstat(options, &dir, changed, "", 0);
2038}
2039static void free_diffstat_info(struct diffstat_t *diffstat)
2041{
2042 int i;
2043 for (i = 0; i < diffstat->nr; i++) {
2044 struct diffstat_file *f = diffstat->files[i];
2045 if (f->name != f->print_name)
2046 free(f->print_name);
2047 free(f->name);
2048 free(f->from_name);
2049 free(f);
2050 }
2051 free(diffstat->files);
2052}
2053struct checkdiff_t {
2055 const char *filename;
2056 int lineno;
2057 int conflict_marker_size;
2058 struct diff_options *o;
2059 unsigned ws_rule;
2060 unsigned status;
2061};
2062static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2064{
2065 char firstchar;
2066 int cnt;
2067 if (len < marker_size + 1)
2069 return 0;
2070 firstchar = line[0];
2071 switch (firstchar) {
2072 case '=': case '>': case '<': case '|':
2073 break;
2074 default:
2075 return 0;
2076 }
2077 for (cnt = 1; cnt < marker_size; cnt++)
2078 if (line[cnt] != firstchar)
2079 return 0;
2080 /* line[1] thru line[marker_size-1] are same as firstchar */
2081 if (len < marker_size + 1 || !isspace(line[marker_size]))
2082 return 0;
2083 return 1;
2084}
2085static void checkdiff_consume(void *priv, char *line, unsigned long len)
2087{
2088 struct checkdiff_t *data = priv;
2089 int marker_size = data->conflict_marker_size;
2090 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2091 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2092 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2093 char *err;
2094 const char *line_prefix;
2095 assert(data->o);
2097 line_prefix = diff_line_prefix(data->o);
2098 if (line[0] == '+') {
2100 unsigned bad;
2101 data->lineno++;
2102 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2103 data->status |= 1;
2104 fprintf(data->o->file,
2105 "%s%s:%d: leftover conflict marker\n",
2106 line_prefix, data->filename, data->lineno);
2107 }
2108 bad = ws_check(line + 1, len - 1, data->ws_rule);
2109 if (!bad)
2110 return;
2111 data->status |= bad;
2112 err = whitespace_error_string(bad);
2113 fprintf(data->o->file, "%s%s:%d: %s.\n",
2114 line_prefix, data->filename, data->lineno, err);
2115 free(err);
2116 emit_line(data->o, set, reset, line, 1);
2117 ws_check_emit(line + 1, len - 1, data->ws_rule,
2118 data->o->file, set, reset, ws);
2119 } else if (line[0] == ' ') {
2120 data->lineno++;
2121 } else if (line[0] == '@') {
2122 char *plus = strchr(line, '+');
2123 if (plus)
2124 data->lineno = strtol(plus, NULL, 10) - 1;
2125 else
2126 die("invalid diff");
2127 }
2128}
2129static unsigned char *deflate_it(char *data,
2131 unsigned long size,
2132 unsigned long *result_size)
2133{
2134 int bound;
2135 unsigned char *deflated;
2136 git_zstream stream;
2137 git_deflate_init(&stream, zlib_compression_level);
2139 bound = git_deflate_bound(&stream, size);
2140 deflated = xmalloc(bound);
2141 stream.next_out = deflated;
2142 stream.avail_out = bound;
2143 stream.next_in = (unsigned char *)data;
2145 stream.avail_in = size;
2146 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2147 ; /* nothing */
2148 git_deflate_end(&stream);
2149 *result_size = stream.total_out;
2150 return deflated;
2151}
2152static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2154 const char *prefix)
2155{
2156 void *cp;
2157 void *delta;
2158 void *deflated;
2159 void *data;
2160 unsigned long orig_size;
2161 unsigned long delta_size;
2162 unsigned long deflate_size;
2163 unsigned long data_size;
2164 /* We could do deflated delta, or we could do just deflated two,
2166 * whichever is smaller.
2167 */
2168 delta = NULL;
2169 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2170 if (one->size && two->size) {
2171 delta = diff_delta(one->ptr, one->size,
2172 two->ptr, two->size,
2173 &delta_size, deflate_size);
2174 if (delta) {
2175 void *to_free = delta;
2176 orig_size = delta_size;
2177 delta = deflate_it(delta, delta_size, &delta_size);
2178 free(to_free);
2179 }
2180 }
2181 if (delta && delta_size < deflate_size) {
2183 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2184 free(deflated);
2185 data = delta;
2186 data_size = delta_size;
2187 }
2188 else {
2189 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2190 free(delta);
2191 data = deflated;
2192 data_size = deflate_size;
2193 }
2194 /* emit data encoded in base85 */
2196 cp = data;
2197 while (data_size) {
2198 int bytes = (52 < data_size) ? 52 : data_size;
2199 char line[70];
2200 data_size -= bytes;
2201 if (bytes <= 26)
2202 line[0] = bytes + 'A' - 1;
2203 else
2204 line[0] = bytes - 26 + 'a' - 1;
2205 encode_85(line + 1, cp, bytes);
2206 cp = (char *) cp + bytes;
2207 fprintf(file, "%s", prefix);
2208 fputs(line, file);
2209 fputc('\n', file);
2210 }
2211 fprintf(file, "%s\n", prefix);
2212 free(data);
2213}
2214static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2216 const char *prefix)
2217{
2218 fprintf(file, "%sGIT binary patch\n", prefix);
2219 emit_binary_diff_body(file, one, two, prefix);
2220 emit_binary_diff_body(file, two, one, prefix);
2221}
2222int diff_filespec_is_binary(struct diff_filespec *one)
2224{
2225 if (one->is_binary == -1) {
2226 diff_filespec_load_driver(one);
2227 if (one->driver->binary != -1)
2228 one->is_binary = one->driver->binary;
2229 else {
2230 if (!one->data && DIFF_FILE_VALID(one))
2231 diff_populate_filespec(one, CHECK_BINARY);
2232 if (one->is_binary == -1 && one->data)
2233 one->is_binary = buffer_is_binary(one->data,
2234 one->size);
2235 if (one->is_binary == -1)
2236 one->is_binary = 0;
2237 }
2238 }
2239 return one->is_binary;
2240}
2241static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2243{
2244 diff_filespec_load_driver(one);
2245 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2246}
2247void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2249{
2250 if (!options->a_prefix)
2251 options->a_prefix = a;
2252 if (!options->b_prefix)
2253 options->b_prefix = b;
2254}
2255struct userdiff_driver *get_textconv(struct diff_filespec *one)
2257{
2258 if (!DIFF_FILE_VALID(one))
2259 return NULL;
2260 diff_filespec_load_driver(one);
2262 return userdiff_get_textconv(one->driver);
2263}
2264static void builtin_diff(const char *name_a,
2266 const char *name_b,
2267 struct diff_filespec *one,
2268 struct diff_filespec *two,
2269 const char *xfrm_msg,
2270 int must_show_header,
2271 struct diff_options *o,
2272 int complete_rewrite)
2273{
2274 mmfile_t mf1, mf2;
2275 const char *lbl[2];
2276 char *a_one, *b_two;
2277 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2278 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2279 const char *a_prefix, *b_prefix;
2280 struct userdiff_driver *textconv_one = NULL;
2281 struct userdiff_driver *textconv_two = NULL;
2282 struct strbuf header = STRBUF_INIT;
2283 const char *line_prefix = diff_line_prefix(o);
2284 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2286 (!one->mode || S_ISGITLINK(one->mode)) &&
2287 (!two->mode || S_ISGITLINK(two->mode))) {
2288 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2289 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2290 show_submodule_summary(o->file, one->path ? one->path : two->path,
2291 line_prefix,
2292 one->sha1, two->sha1, two->dirty_submodule,
2293 meta, del, add, reset);
2294 return;
2295 }
2296 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2298 textconv_one = get_textconv(one);
2299 textconv_two = get_textconv(two);
2300 }
2301 diff_set_mnemonic_prefix(o, "a/", "b/");
2303 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2304 a_prefix = o->b_prefix;
2305 b_prefix = o->a_prefix;
2306 } else {
2307 a_prefix = o->a_prefix;
2308 b_prefix = o->b_prefix;
2309 }
2310 /* Never use a non-valid filename anywhere if at all possible */
2312 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2313 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2314 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2316 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2317 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2318 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2319 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2320 if (lbl[0][0] == '/') {
2321 /* /dev/null */
2322 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2323 if (xfrm_msg)
2324 strbuf_addstr(&header, xfrm_msg);
2325 must_show_header = 1;
2326 }
2327 else if (lbl[1][0] == '/') {
2328 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2329 if (xfrm_msg)
2330 strbuf_addstr(&header, xfrm_msg);
2331 must_show_header = 1;
2332 }
2333 else {
2334 if (one->mode != two->mode) {
2335 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2336 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2337 must_show_header = 1;
2338 }
2339 if (xfrm_msg)
2340 strbuf_addstr(&header, xfrm_msg);
2341 /*
2343 * we do not run diff between different kind
2344 * of objects.
2345 */
2346 if ((one->mode ^ two->mode) & S_IFMT)
2347 goto free_ab_and_return;
2348 if (complete_rewrite &&
2349 (textconv_one || !diff_filespec_is_binary(one)) &&
2350 (textconv_two || !diff_filespec_is_binary(two))) {
2351 fprintf(o->file, "%s", header.buf);
2352 strbuf_reset(&header);
2353 emit_rewrite_diff(name_a, name_b, one, two,
2354 textconv_one, textconv_two, o);
2355 o->found_changes = 1;
2356 goto free_ab_and_return;
2357 }
2358 }
2359 if (o->irreversible_delete && lbl[1][0] == '/') {
2361 fprintf(o->file, "%s", header.buf);
2362 strbuf_reset(&header);
2363 goto free_ab_and_return;
2364 } else if (!DIFF_OPT_TST(o, TEXT) &&
2365 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2366 (!textconv_two && diff_filespec_is_binary(two)) )) {
2367 if (!one->data && !two->data &&
2368 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2369 !DIFF_OPT_TST(o, BINARY)) {
2370 if (!hashcmp(one->sha1, two->sha1)) {
2371 if (must_show_header)
2372 fprintf(o->file, "%s", header.buf);
2373 goto free_ab_and_return;
2374 }
2375 fprintf(o->file, "%s", header.buf);
2376 fprintf(o->file, "%sBinary files %s and %s differ\n",
2377 line_prefix, lbl[0], lbl[1]);
2378 goto free_ab_and_return;
2379 }
2380 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2381 die("unable to read files to diff");
2382 /* Quite common confusing case */
2383 if (mf1.size == mf2.size &&
2384 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2385 if (must_show_header)
2386 fprintf(o->file, "%s", header.buf);
2387 goto free_ab_and_return;
2388 }
2389 fprintf(o->file, "%s", header.buf);
2390 strbuf_reset(&header);
2391 if (DIFF_OPT_TST(o, BINARY))
2392 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2393 else
2394 fprintf(o->file, "%sBinary files %s and %s differ\n",
2395 line_prefix, lbl[0], lbl[1]);
2396 o->found_changes = 1;
2397 } else {
2398 /* Crazy xdl interfaces.. */
2399 const char *diffopts = getenv("GIT_DIFF_OPTS");
2400 const char *v;
2401 xpparam_t xpp;
2402 xdemitconf_t xecfg;
2403 struct emit_callback ecbdata;
2404 const struct userdiff_funcname *pe;
2405 if (must_show_header) {
2407 fprintf(o->file, "%s", header.buf);
2408 strbuf_reset(&header);
2409 }
2410 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2412 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2413 pe = diff_funcname_pattern(one);
2415 if (!pe)
2416 pe = diff_funcname_pattern(two);
2417 memset(&xpp, 0, sizeof(xpp));
2419 memset(&xecfg, 0, sizeof(xecfg));
2420 memset(&ecbdata, 0, sizeof(ecbdata));
2421 ecbdata.label_path = lbl;
2422 ecbdata.color_diff = want_color(o->use_color);
2423 ecbdata.found_changesp = &o->found_changes;
2424 ecbdata.ws_rule = whitespace_rule(name_b);
2425 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2426 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2427 ecbdata.opt = o;
2428 ecbdata.header = header.len ? &header : NULL;
2429 xpp.flags = o->xdl_opts;
2430 xecfg.ctxlen = o->context;
2431 xecfg.interhunkctxlen = o->interhunkcontext;
2432 xecfg.flags = XDL_EMIT_FUNCNAMES;
2433 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2434 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2435 if (pe)
2436 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2437 if (!diffopts)
2438 ;
2439 else if (skip_prefix(diffopts, "--unified=", &v))
2440 xecfg.ctxlen = strtoul(v, NULL, 10);
2441 else if (skip_prefix(diffopts, "-u", &v))
2442 xecfg.ctxlen = strtoul(v, NULL, 10);
2443 if (o->word_diff)
2444 init_diff_words_data(&ecbdata, o, one, two);
2445 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2446 &xpp, &xecfg);
2447 if (o->word_diff)
2448 free_diff_words_data(&ecbdata);
2449 if (textconv_one)
2450 free(mf1.ptr);
2451 if (textconv_two)
2452 free(mf2.ptr);
2453 xdiff_clear_find_func(&xecfg);
2454 }
2455 free_ab_and_return:
2457 strbuf_release(&header);
2458 diff_free_filespec_data(one);
2459 diff_free_filespec_data(two);
2460 free(a_one);
2461 free(b_two);
2462 return;
2463}
2464static void builtin_diffstat(const char *name_a, const char *name_b,
2466 struct diff_filespec *one,
2467 struct diff_filespec *two,
2468 struct diffstat_t *diffstat,
2469 struct diff_options *o,
2470 struct diff_filepair *p)
2471{
2472 mmfile_t mf1, mf2;
2473 struct diffstat_file *data;
2474 int same_contents;
2475 int complete_rewrite = 0;
2476 if (!DIFF_PAIR_UNMERGED(p)) {
2478 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2479 complete_rewrite = 1;
2480 }
2481 data = diffstat_add(diffstat, name_a, name_b);
2483 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2484 if (!one || !two) {
2486 data->is_unmerged = 1;
2487 return;
2488 }
2489 same_contents = !hashcmp(one->sha1, two->sha1);
2491 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2493 data->is_binary = 1;
2494 if (same_contents) {
2495 data->added = 0;
2496 data->deleted = 0;
2497 } else {
2498 data->added = diff_filespec_size(two);
2499 data->deleted = diff_filespec_size(one);
2500 }
2501 }
2502 else if (complete_rewrite) {
2504 diff_populate_filespec(one, 0);
2505 diff_populate_filespec(two, 0);
2506 data->deleted = count_lines(one->data, one->size);
2507 data->added = count_lines(two->data, two->size);
2508 }
2509 else if (!same_contents) {
2511 /* Crazy xdl interfaces.. */
2512 xpparam_t xpp;
2513 xdemitconf_t xecfg;
2514 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2516 die("unable to read files to diff");
2517 memset(&xpp, 0, sizeof(xpp));
2519 memset(&xecfg, 0, sizeof(xecfg));
2520 xpp.flags = o->xdl_opts;
2521 xecfg.ctxlen = o->context;
2522 xecfg.interhunkctxlen = o->interhunkcontext;
2523 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2524 &xpp, &xecfg);
2525 }
2526 diff_free_filespec_data(one);
2528 diff_free_filespec_data(two);
2529}
2530static void builtin_checkdiff(const char *name_a, const char *name_b,
2532 const char *attr_path,
2533 struct diff_filespec *one,
2534 struct diff_filespec *two,
2535 struct diff_options *o)
2536{
2537 mmfile_t mf1, mf2;
2538 struct checkdiff_t data;
2539 if (!two)
2541 return;
2542 memset(&data, 0, sizeof(data));
2544 data.filename = name_b ? name_b : name_a;
2545 data.lineno = 0;
2546 data.o = o;
2547 data.ws_rule = whitespace_rule(attr_path);
2548 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2549 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2551 die("unable to read files to diff");
2552 /*
2554 * All the other codepaths check both sides, but not checking
2555 * the "old" side here is deliberate. We are checking the newly
2556 * introduced changes, and as long as the "new" side is text, we
2557 * can and should check what it introduces.
2558 */
2559 if (diff_filespec_is_binary(two))
2560 goto free_and_return;
2561 else {
2562 /* Crazy xdl interfaces.. */
2563 xpparam_t xpp;
2564 xdemitconf_t xecfg;
2565 memset(&xpp, 0, sizeof(xpp));
2567 memset(&xecfg, 0, sizeof(xecfg));
2568 xecfg.ctxlen = 1; /* at least one context line */
2569 xpp.flags = 0;
2570 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2571 &xpp, &xecfg);
2572 if (data.ws_rule & WS_BLANK_AT_EOF) {
2574 struct emit_callback ecbdata;
2575 int blank_at_eof;
2576 ecbdata.ws_rule = data.ws_rule;
2578 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2579 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2580 if (blank_at_eof) {
2582 static char *err;
2583 if (!err)
2584 err = whitespace_error_string(WS_BLANK_AT_EOF);
2585 fprintf(o->file, "%s:%d: %s.\n",
2586 data.filename, blank_at_eof, err);
2587 data.status = 1; /* report errors */
2588 }
2589 }
2590 }
2591 free_and_return:
2592 diff_free_filespec_data(one);
2593 diff_free_filespec_data(two);
2594 if (data.status)
2595 DIFF_OPT_SET(o, CHECK_FAILED);
2596}
2597struct diff_filespec *alloc_filespec(const char *path)
2599{
2600 int namelen = strlen(path);
2601 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2602 memset(spec, 0, sizeof(*spec));
2604 spec->path = (char *)(spec + 1);
2605 memcpy(spec->path, path, namelen+1);
2606 spec->count = 1;
2607 spec->is_binary = -1;
2608 return spec;
2609}
2610void free_filespec(struct diff_filespec *spec)
2612{
2613 if (!--spec->count) {
2614 diff_free_filespec_data(spec);
2615 free(spec);
2616 }
2617}
2618void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2620 int sha1_valid, unsigned short mode)
2621{
2622 if (mode) {
2623 spec->mode = canon_mode(mode);
2624 hashcpy(spec->sha1, sha1);
2625 spec->sha1_valid = sha1_valid;
2626 }
2627}
2628/*
2630 * Given a name and sha1 pair, if the index tells us the file in
2631 * the work tree has that object contents, return true, so that
2632 * prepare_temp_file() does not have to inflate and extract.
2633 */
2634static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2635{
2636 const struct cache_entry *ce;
2637 struct stat st;
2638 int pos, len;
2639 /*
2641 * We do not read the cache ourselves here, because the
2642 * benchmark with my previous version that always reads cache
2643 * shows that it makes things worse for diff-tree comparing
2644 * two linux-2.6 kernel trees in an already checked out work
2645 * tree. This is because most diff-tree comparisons deal with
2646 * only a small number of files, while reading the cache is
2647 * expensive for a large project, and its cost outweighs the
2648 * savings we get by not inflating the object to a temporary
2649 * file. Practically, this code only helps when we are used
2650 * by diff-cache --cached, which does read the cache before
2651 * calling us.
2652 */
2653 if (!active_cache)
2654 return 0;
2655 /* We want to avoid the working directory if our caller
2657 * doesn't need the data in a normal file, this system
2658 * is rather slow with its stat/open/mmap/close syscalls,
2659 * and the object is contained in a pack file. The pack
2660 * is probably already open and will be faster to obtain
2661 * the data through than the working directory. Loose
2662 * objects however would tend to be slower as they need
2663 * to be individually opened and inflated.
2664 */
2665 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2666 return 0;
2667 len = strlen(name);
2669 pos = cache_name_pos(name, len);
2670 if (pos < 0)
2671 return 0;
2672 ce = active_cache[pos];
2673 /*
2675 * This is not the sha1 we are looking for, or
2676 * unreusable because it is not a regular file.
2677 */
2678 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2679 return 0;
2680 /*
2682 * If ce is marked as "assume unchanged", there is no
2683 * guarantee that work tree matches what we are looking for.
2684 */
2685 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2686 return 0;
2687 /*
2689 * If ce matches the file in the work tree, we can reuse it.
2690 */
2691 if (ce_uptodate(ce) ||
2692 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2693 return 1;
2694 return 0;
2696}
2697static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2699{
2700 int len;
2701 char *data = xmalloc(100), *dirty = "";
2702 /* Are we looking at the work tree? */
2704 if (s->dirty_submodule)
2705 dirty = "-dirty";
2706 len = snprintf(data, 100,
2708 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2709 s->data = data;
2710 s->size = len;
2711 s->should_free = 1;
2712 if (size_only) {
2713 s->data = NULL;
2714 free(data);
2715 }
2716 return 0;
2717}
2718/*
2720 * While doing rename detection and pickaxe operation, we may need to
2721 * grab the data for the blob (or file) for our own in-core comparison.
2722 * diff_filespec has data and size fields for this purpose.
2723 */
2724int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
2725{
2726 int size_only = flags & CHECK_SIZE_ONLY;
2727 int err = 0;
2728 /*
2729 * demote FAIL to WARN to allow inspecting the situation
2730 * instead of refusing.
2731 */
2732 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2733 ? SAFE_CRLF_WARN
2734 : safe_crlf);
2735 if (!DIFF_FILE_VALID(s))
2737 die("internal error: asking to populate invalid file.");
2738 if (S_ISDIR(s->mode))
2739 return -1;
2740 if (s->data)
2742 return 0;
2743 if (size_only && 0 < s->size)
2745 return 0;
2746 if (S_ISGITLINK(s->mode))
2748 return diff_populate_gitlink(s, size_only);
2749 if (!s->sha1_valid ||
2751 reuse_worktree_file(s->path, s->sha1, 0)) {
2752 struct strbuf buf = STRBUF_INIT;
2753 struct stat st;
2754 int fd;
2755 if (lstat(s->path, &st) < 0) {
2757 if (errno == ENOENT) {
2758 err_empty:
2759 err = -1;
2760 empty:
2761 s->data = (char *)"";
2762 s->size = 0;
2763 return err;
2764 }
2765 }
2766 s->size = xsize_t(st.st_size);
2767 if (!s->size)
2768 goto empty;
2769 if (S_ISLNK(st.st_mode)) {
2770 struct strbuf sb = STRBUF_INIT;
2771 if (strbuf_readlink(&sb, s->path, s->size))
2773 goto err_empty;
2774 s->size = sb.len;
2775 s->data = strbuf_detach(&sb, NULL);
2776 s->should_free = 1;
2777 return 0;
2778 }
2779 if (size_only)
2780 return 0;
2781 if ((flags & CHECK_BINARY) &&
2782 s->size > big_file_threshold && s->is_binary == -1) {
2783 s->is_binary = 1;
2784 return 0;
2785 }
2786 fd = open(s->path, O_RDONLY);
2787 if (fd < 0)
2788 goto err_empty;
2789 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2790 close(fd);
2791 s->should_munmap = 1;
2792 /*
2794 * Convert from working tree format to canonical git format
2795 */
2796 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2797 size_t size = 0;
2798 munmap(s->data, s->size);
2799 s->should_munmap = 0;
2800 s->data = strbuf_detach(&buf, &size);
2801 s->size = size;
2802 s->should_free = 1;
2803 }
2804 }
2805 else {
2806 enum object_type type;
2807 if (size_only || (flags & CHECK_BINARY)) {
2808 type = sha1_object_info(s->sha1, &s->size);
2809 if (type < 0)
2810 die("unable to read %s", sha1_to_hex(s->sha1));
2811 if (size_only)
2812 return 0;
2813 if (s->size > big_file_threshold && s->is_binary == -1) {
2814 s->is_binary = 1;
2815 return 0;
2816 }
2817 }
2818 s->data = read_sha1_file(s->sha1, &type, &s->size);
2819 if (!s->data)
2820 die("unable to read %s", sha1_to_hex(s->sha1));
2821 s->should_free = 1;
2822 }
2823 return 0;
2824}
2825void diff_free_filespec_blob(struct diff_filespec *s)
2827{
2828 if (s->should_free)
2829 free(s->data);
2830 else if (s->should_munmap)
2831 munmap(s->data, s->size);
2832 if (s->should_free || s->should_munmap) {
2834 s->should_free = s->should_munmap = 0;
2835 s->data = NULL;
2836 }
2837}
2838void diff_free_filespec_data(struct diff_filespec *s)
2840{
2841 diff_free_filespec_blob(s);
2842 free(s->cnt_data);
2843 s->cnt_data = NULL;
2844}
2845static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2847 void *blob,
2848 unsigned long size,
2849 const unsigned char *sha1,
2850 int mode)
2851{
2852 int fd;
2853 struct strbuf buf = STRBUF_INIT;
2854 struct strbuf template = STRBUF_INIT;
2855 char *path_dup = xstrdup(path);
2856 const char *base = basename(path_dup);
2857 /* Generate "XXXXXX_basename.ext" */
2859 strbuf_addstr(&template, "XXXXXX_");
2860 strbuf_addstr(&template, base);
2861 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2863 strlen(base) + 1);
2864 if (fd < 0)
2865 die_errno("unable to create temp-file");
2866 if (convert_to_working_tree(path,
2867 (const char *)blob, (size_t)size, &buf)) {
2868 blob = buf.buf;
2869 size = buf.len;
2870 }
2871 if (write_in_full(fd, blob, size) != size)
2872 die_errno("unable to write temp-file");
2873 close(fd);
2874 temp->name = temp->tmp_path;
2875 strcpy(temp->hex, sha1_to_hex(sha1));
2876 temp->hex[40] = 0;
2877 sprintf(temp->mode, "%06o", mode);
2878 strbuf_release(&buf);
2879 strbuf_release(&template);
2880 free(path_dup);
2881}
2882static struct diff_tempfile *prepare_temp_file(const char *name,
2884 struct diff_filespec *one)
2885{
2886 struct diff_tempfile *temp = claim_diff_tempfile();
2887 if (!DIFF_FILE_VALID(one)) {
2889 not_a_valid_file:
2890 /* A '-' entry produces this for file-2, and
2891 * a '+' entry produces this for file-1.
2892 */
2893 temp->name = "/dev/null";
2894 strcpy(temp->hex, ".");
2895 strcpy(temp->mode, ".");
2896 return temp;
2897 }
2898 if (!remove_tempfile_installed) {
2900 atexit(remove_tempfile);
2901 sigchain_push_common(remove_tempfile_on_signal);
2902 remove_tempfile_installed = 1;
2903 }
2904 if (!S_ISGITLINK(one->mode) &&
2906 (!one->sha1_valid ||
2907 reuse_worktree_file(name, one->sha1, 1))) {
2908 struct stat st;
2909 if (lstat(name, &st) < 0) {
2910 if (errno == ENOENT)
2911 goto not_a_valid_file;
2912 die_errno("stat(%s)", name);
2913 }
2914 if (S_ISLNK(st.st_mode)) {
2915 struct strbuf sb = STRBUF_INIT;
2916 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2917 die_errno("readlink(%s)", name);
2918 prep_temp_blob(name, temp, sb.buf, sb.len,
2919 (one->sha1_valid ?
2920 one->sha1 : null_sha1),
2921 (one->sha1_valid ?
2922 one->mode : S_IFLNK));
2923 strbuf_release(&sb);
2924 }
2925 else {
2926 /* we can borrow from the file in the work tree */
2927 temp->name = name;
2928 if (!one->sha1_valid)
2929 strcpy(temp->hex, sha1_to_hex(null_sha1));
2930 else
2931 strcpy(temp->hex, sha1_to_hex(one->sha1));
2932 /* Even though we may sometimes borrow the
2933 * contents from the work tree, we always want
2934 * one->mode. mode is trustworthy even when
2935 * !(one->sha1_valid), as long as
2936 * DIFF_FILE_VALID(one).
2937 */
2938 sprintf(temp->mode, "%06o", one->mode);
2939 }
2940 return temp;
2941 }
2942 else {
2943 if (diff_populate_filespec(one, 0))
2944 die("cannot read data blob for %s", one->path);
2945 prep_temp_blob(name, temp, one->data, one->size,
2946 one->sha1, one->mode);
2947 }
2948 return temp;
2949}
2950static void add_external_diff_name(struct argv_array *argv,
2952 const char *name,
2953 struct diff_filespec *df)
2954{
2955 struct diff_tempfile *temp = prepare_temp_file(name, df);
2956 argv_array_push(argv, temp->name);
2957 argv_array_push(argv, temp->hex);
2958 argv_array_push(argv, temp->mode);
2959}
2960/* An external diff command takes:
2962 *
2963 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2964 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2965 *
2966 */
2967static void run_external_diff(const char *pgm,
2968 const char *name,
2969 const char *other,
2970 struct diff_filespec *one,
2971 struct diff_filespec *two,
2972 const char *xfrm_msg,
2973 int complete_rewrite,
2974 struct diff_options *o)
2975{
2976 struct argv_array argv = ARGV_ARRAY_INIT;
2977 struct argv_array env = ARGV_ARRAY_INIT;
2978 struct diff_queue_struct *q = &diff_queued_diff;
2979 argv_array_push(&argv, pgm);
2981 argv_array_push(&argv, name);
2982 if (one && two) {
2984 add_external_diff_name(&argv, name, one);
2985 if (!other)
2986 add_external_diff_name(&argv, name, two);
2987 else {
2988 add_external_diff_name(&argv, other, two);
2989 argv_array_push(&argv, other);
2990 argv_array_push(&argv, xfrm_msg);
2991 }
2992 }
2993 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
2995 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
2996 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
2998 die(_("external diff died, stopping at %s"), name);
2999 remove_tempfile();
3001 argv_array_clear(&argv);
3002 argv_array_clear(&env);
3003}
3004static int similarity_index(struct diff_filepair *p)
3006{
3007 return p->score * 100 / MAX_SCORE;
3008}
3009static void fill_metainfo(struct strbuf *msg,
3011 const char *name,
3012 const char *other,
3013 struct diff_filespec *one,
3014 struct diff_filespec *two,
3015 struct diff_options *o,
3016 struct diff_filepair *p,
3017 int *must_show_header,
3018 int use_color)
3019{
3020 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3021 const char *reset = diff_get_color(use_color, DIFF_RESET);
3022 const char *line_prefix = diff_line_prefix(o);
3023 *must_show_header = 1;
3025 strbuf_init(msg, PATH_MAX * 2 + 300);
3026 switch (p->status) {
3027 case DIFF_STATUS_COPIED:
3028 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3029 line_prefix, set, similarity_index(p));
3030 strbuf_addf(msg, "%s\n%s%scopy from ",
3031 reset, line_prefix, set);
3032 quote_c_style(name, msg, NULL, 0);
3033 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3034 quote_c_style(other, msg, NULL, 0);
3035 strbuf_addf(msg, "%s\n", reset);
3036 break;
3037 case DIFF_STATUS_RENAMED:
3038 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3039 line_prefix, set, similarity_index(p));
3040 strbuf_addf(msg, "%s\n%s%srename from ",
3041 reset, line_prefix, set);
3042 quote_c_style(name, msg, NULL, 0);
3043 strbuf_addf(msg, "%s\n%s%srename to ",
3044 reset, line_prefix, set);
3045 quote_c_style(other, msg, NULL, 0);
3046 strbuf_addf(msg, "%s\n", reset);
3047 break;
3048 case DIFF_STATUS_MODIFIED:
3049 if (p->score) {
3050 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3051 line_prefix,
3052 set, similarity_index(p), reset);
3053 break;
3054 }
3055 /* fallthru */
3056 default:
3057 *must_show_header = 0;
3058 }
3059 if (one && two && hashcmp(one->sha1, two->sha1)) {
3060 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3061 if (DIFF_OPT_TST(o, BINARY)) {
3063 mmfile_t mf;
3064 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3065 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3066 abbrev = 40;
3067 }
3068 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3069 find_unique_abbrev(one->sha1, abbrev));
3070 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3071 if (one->mode == two->mode)
3072 strbuf_addf(msg, " %06o", one->mode);
3073 strbuf_addf(msg, "%s\n", reset);
3074 }
3075}
3076static void run_diff_cmd(const char *pgm,
3078 const char *name,
3079 const char *other,
3080 const char *attr_path,
3081 struct diff_filespec *one,
3082 struct diff_filespec *two,
3083 struct strbuf *msg,
3084 struct diff_options *o,
3085 struct diff_filepair *p)
3086{
3087 const char *xfrm_msg = NULL;
3088 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3089 int must_show_header = 0;
3090 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3093 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3094 if (drv && drv->external)
3095 pgm = drv->external;
3096 }
3097 if (msg) {
3099 /*
3100 * don't use colors when the header is intended for an
3101 * external diff driver
3102 */
3103 fill_metainfo(msg, name, other, one, two, o, p,
3104 &must_show_header,
3105 want_color(o->use_color) && !pgm);
3106 xfrm_msg = msg->len ? msg->buf : NULL;
3107 }
3108 if (pgm) {
3110 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3111 complete_rewrite, o);
3112 return;
3113 }
3114 if (one && two)
3115 builtin_diff(name, other ? other : name,
3116 one, two, xfrm_msg, must_show_header,
3117 o, complete_rewrite);
3118 else
3119 fprintf(o->file, "* Unmerged path %s\n", name);
3120}
3121static void diff_fill_sha1_info(struct diff_filespec *one)
3123{
3124 if (DIFF_FILE_VALID(one)) {
3125 if (!one->sha1_valid) {
3126 struct stat st;
3127 if (one->is_stdin) {
3128 hashcpy(one->sha1, null_sha1);
3129 return;
3130 }
3131 if (lstat(one->path, &st) < 0)
3132 die_errno("stat '%s'", one->path);
3133 if (index_path(one->sha1, one->path, &st, 0))
3134 die("cannot hash %s", one->path);
3135 }
3136 }
3137 else
3138 hashclr(one->sha1);
3139}
3140static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3142{
3143 /* Strip the prefix but do not molest /dev/null and absolute paths */
3144 if (*namep && **namep != '/') {
3145 *namep += prefix_length;
3146 if (**namep == '/')
3147 ++*namep;
3148 }
3149 if (*otherp && **otherp != '/') {
3150 *otherp += prefix_length;
3151 if (**otherp == '/')
3152 ++*otherp;
3153 }
3154}
3155static void run_diff(struct diff_filepair *p, struct diff_options *o)
3157{
3158 const char *pgm = external_diff();
3159 struct strbuf msg;
3160 struct diff_filespec *one = p->one;
3161 struct diff_filespec *two = p->two;
3162 const char *name;
3163 const char *other;
3164 const char *attr_path;
3165 name = p->one->path;
3167 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3168 attr_path = name;
3169 if (o->prefix_length)
3170 strip_prefix(o->prefix_length, &name, &other);
3171 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3173 pgm = NULL;
3174 if (DIFF_PAIR_UNMERGED(p)) {
3176 run_diff_cmd(pgm, name, NULL, attr_path,
3177 NULL, NULL, NULL, o, p);
3178 return;
3179 }
3180 diff_fill_sha1_info(one);
3182 diff_fill_sha1_info(two);
3183 if (!pgm &&
3185 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3186 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3187 /*
3188 * a filepair that changes between file and symlink
3189 * needs to be split into deletion and creation.
3190 */
3191 struct diff_filespec *null = alloc_filespec(two->path);
3192 run_diff_cmd(NULL, name, other, attr_path,
3193 one, null, &msg, o, p);
3194 free(null);
3195 strbuf_release(&msg);
3196 null = alloc_filespec(one->path);
3198 run_diff_cmd(NULL, name, other, attr_path,
3199 null, two, &msg, o, p);
3200 free(null);
3201 }
3202 else
3203 run_diff_cmd(pgm, name, other, attr_path,
3204 one, two, &msg, o, p);
3205 strbuf_release(&msg);
3207}
3208static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3210 struct diffstat_t *diffstat)
3211{
3212 const char *name;
3213 const char *other;
3214 if (DIFF_PAIR_UNMERGED(p)) {
3216 /* unmerged */
3217 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3218 return;
3219 }
3220 name = p->one->path;
3222 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3223 if (o->prefix_length)
3225 strip_prefix(o->prefix_length, &name, &other);
3226 diff_fill_sha1_info(p->one);
3228 diff_fill_sha1_info(p->two);
3229 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3231}
3232static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3234{
3235 const char *name;
3236 const char *other;
3237 const char *attr_path;
3238 if (DIFF_PAIR_UNMERGED(p)) {
3240 /* unmerged */
3241 return;
3242 }
3243 name = p->one->path;
3245 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3246 attr_path = other ? other : name;
3247 if (o->prefix_length)
3249 strip_prefix(o->prefix_length, &name, &other);
3250 diff_fill_sha1_info(p->one);
3252 diff_fill_sha1_info(p->two);
3253 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3255}
3256void diff_setup(struct diff_options *options)
3258{
3259 memcpy(options, &default_diff_options, sizeof(*options));
3260 options->file = stdout;
3262 options->line_termination = '\n';
3264 options->break_opt = -1;
3265 options->rename_limit = -1;
3266 options->dirstat_permille = diff_dirstat_permille_default;
3267 options->context = diff_context_default;
3268 options->ws_error_highlight = WSEH_NEW;
3269 DIFF_OPT_SET(options, RENAME_EMPTY);
3270 /* pathchange left =NULL by default */
3272 options->change = diff_change;
3273 options->add_remove = diff_addremove;
3274 options->use_color = diff_use_color_default;
3275 options->detect_rename = diff_detect_rename_default;
3276 options->xdl_opts |= diff_algorithm;
3277 options->orderfile = diff_order_file_cfg;
3279 if (diff_no_prefix) {
3281 options->a_prefix = options->b_prefix = "";
3282 } else if (!diff_mnemonic_prefix) {
3283 options->a_prefix = "a/";
3284 options->b_prefix = "b/";
3285 }
3286}
3287void diff_setup_done(struct diff_options *options)
3289{
3290 int count = 0;
3291 if (options->set_default)
3293 options->set_default(options);
3294 if (options->output_format & DIFF_FORMAT_NAME)
3296 count++;
3297 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3298 count++;
3299 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3300 count++;
3301 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3302 count++;
3303 if (count > 1)
3304 die("--name-only, --name-status, --check and -s are mutually exclusive");
3305 /*
3307 * Most of the time we can say "there are changes"
3308 * only by checking if there are changed paths, but
3309 * --ignore-whitespace* options force us to look
3310 * inside contents.
3311 */
3312 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3314 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3315 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3316 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3317 else
3318 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3319 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3321 options->detect_rename = DIFF_DETECT_COPY;
3322 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3324 options->prefix = NULL;
3325 if (options->prefix)
3326 options->prefix_length = strlen(options->prefix);
3327 else
3328 options->prefix_length = 0;
3329 if (options->output_format & (DIFF_FORMAT_NAME |
3331 DIFF_FORMAT_NAME_STATUS |
3332 DIFF_FORMAT_CHECKDIFF |
3333 DIFF_FORMAT_NO_OUTPUT))
3334 options->output_format &= ~(DIFF_FORMAT_RAW |
3335 DIFF_FORMAT_NUMSTAT |
3336 DIFF_FORMAT_DIFFSTAT |
3337 DIFF_FORMAT_SHORTSTAT |
3338 DIFF_FORMAT_DIRSTAT |
3339 DIFF_FORMAT_SUMMARY |
3340 DIFF_FORMAT_PATCH);
3341 /*
3343 * These cases always need recursive; we do not drop caller-supplied
3344 * recursive bits for other formats here.
3345 */
3346 if (options->output_format & (DIFF_FORMAT_PATCH |
3347 DIFF_FORMAT_NUMSTAT |
3348 DIFF_FORMAT_DIFFSTAT |
3349 DIFF_FORMAT_SHORTSTAT |
3350 DIFF_FORMAT_DIRSTAT |
3351 DIFF_FORMAT_SUMMARY |
3352 DIFF_FORMAT_CHECKDIFF))
3353 DIFF_OPT_SET(options, RECURSIVE);
3354 /*
3355 * Also pickaxe would not work very well if you do not say recursive
3356 */
3357 if (options->pickaxe)
3358 DIFF_OPT_SET(options, RECURSIVE);
3359 /*
3360 * When patches are generated, submodules diffed against the work tree
3361 * must be checked for dirtiness too so it can be shown in the output
3362 */
3363 if (options->output_format & DIFF_FORMAT_PATCH)
3364 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3365 if (options->detect_rename && options->rename_limit < 0)
3367 options->rename_limit = diff_rename_limit_default;
3368 if (options->setup & DIFF_SETUP_USE_CACHE) {
3369 if (!active_cache)
3370 /* read-cache does not die even when it fails
3371 * so it is safe for us to do this here. Also
3372 * it does not smudge active_cache or active_nr
3373 * when it fails, so we do not have to worry about
3374 * cleaning it up ourselves either.
3375 */
3376 read_cache();
3377 }
3378 if (options->abbrev <= 0 || 40 < options->abbrev)
3379 options->abbrev = 40; /* full */
3380 /*
3382 * It does not make sense to show the first hit we happened
3383 * to have found. It does not make sense not to return with
3384 * exit code in such a case either.
3385 */
3386 if (DIFF_OPT_TST(options, QUICK)) {
3387 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3388 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3389 }
3390 options->diff_path_counter = 0;
3392 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3394 die(_("--follow requires exactly one pathspec"));
3395}
3396static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3398{
3399 char c, *eq;
3400 int len;
3401 if (*arg != '-')
3403 return 0;
3404 c = *++arg;
3405 if (!c)
3406 return 0;
3407 if (c == arg_short) {
3408 c = *++arg;
3409 if (!c)
3410 return 1;
3411 if (val && isdigit(c)) {
3412 char *end;
3413 int n = strtoul(arg, &end, 10);
3414 if (*end)
3415 return 0;
3416 *val = n;
3417 return 1;
3418 }
3419 return 0;
3420 }
3421 if (c != '-')
3422 return 0;
3423 arg++;
3424 eq = strchrnul(arg, '=');
3425 len = eq - arg;
3426 if (!len || strncmp(arg, arg_long, len))
3427 return 0;
3428 if (*eq) {
3429 int n;
3430 char *end;
3431 if (!isdigit(*++eq))
3432 return 0;
3433 n = strtoul(eq, &end, 10);
3434 if (*end)
3435 return 0;
3436 *val = n;
3437 }
3438 return 1;
3439}
3440static int diff_scoreopt_parse(const char *opt);
3442static inline int short_opt(char opt, const char **argv,
3444 const char **optarg)
3445{
3446 const char *arg = argv[0];
3447 if (arg[0] != '-' || arg[1] != opt)
3448 return 0;
3449 if (arg[2] != '\0') {
3450 *optarg = arg + 2;
3451 return 1;
3452 }
3453 if (!argv[1])
3454 die("Option '%c' requires a value", opt);
3455 *optarg = argv[1];
3456 return 2;
3457}
3458int parse_long_opt(const char *opt, const char **argv,
3460 const char **optarg)
3461{
3462 const char *arg = argv[0];
3463 if (!skip_prefix(arg, "--", &arg))
3464 return 0;
3465 if (!skip_prefix(arg, opt, &arg))
3466 return 0;
3467 if (*arg == '=') { /* stuck form: --option=value */
3468 *optarg = arg + 1;
3469 return 1;
3470 }
3471 if (*arg != '\0')
3472 return 0;
3473 /* separate form: --option value */
3474 if (!argv[1])
3475 die("Option '--%s' requires a value", opt);
3476 *optarg = argv[1];
3477 return 2;
3478}
3479static int stat_opt(struct diff_options *options, const char **av)
3481{
3482 const char *arg = av[0];
3483 char *end;
3484 int width = options->stat_width;
3485 int name_width = options->stat_name_width;
3486 int graph_width = options->stat_graph_width;
3487 int count = options->stat_count;
3488 int argcount = 1;
3489 if (!skip_prefix(arg, "--stat", &arg))
3491 die("BUG: stat option does not begin with --stat: %s", arg);
3492 end = (char *)arg;
3493 switch (*arg) {
3495 case '-':
3496 if (skip_prefix(arg, "-width", &arg)) {
3497 if (*arg == '=')
3498 width = strtoul(arg + 1, &end, 10);
3499 else if (!*arg && !av[1])
3500 die("Option '--stat-width' requires a value");
3501 else if (!*arg) {
3502 width = strtoul(av[1], &end, 10);
3503 argcount = 2;
3504 }
3505 } else if (skip_prefix(arg, "-name-width", &arg)) {
3506 if (*arg == '=')
3507 name_width = strtoul(arg + 1, &end, 10);
3508 else if (!*arg && !av[1])
3509 die("Option '--stat-name-width' requires a value");
3510 else if (!*arg) {
3511 name_width = strtoul(av[1], &end, 10);
3512 argcount = 2;
3513 }
3514 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3515 if (*arg == '=')
3516 graph_width = strtoul(arg + 1, &end, 10);
3517 else if (!*arg && !av[1])
3518 die("Option '--stat-graph-width' requires a value");
3519 else if (!*arg) {
3520 graph_width = strtoul(av[1], &end, 10);
3521 argcount = 2;
3522 }
3523 } else if (skip_prefix(arg, "-count", &arg)) {
3524 if (*arg == '=')
3525 count = strtoul(arg + 1, &end, 10);
3526 else if (!*arg && !av[1])
3527 die("Option '--stat-count' requires a value");
3528 else if (!*arg) {
3529 count = strtoul(av[1], &end, 10);
3530 argcount = 2;
3531 }
3532 }
3533 break;
3534 case '=':
3535 width = strtoul(arg+1, &end, 10);
3536 if (*end == ',')
3537 name_width = strtoul(end+1, &end, 10);
3538 if (*end == ',')
3539 count = strtoul(end+1, &end, 10);
3540 }
3541 /* Important! This checks all the error cases! */
3543 if (*end)
3544 return 0;
3545 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3546 options->stat_name_width = name_width;
3547 options->stat_graph_width = graph_width;
3548 options->stat_width = width;
3549 options->stat_count = count;
3550 return argcount;
3551}
3552static int parse_dirstat_opt(struct diff_options *options, const char *params)
3554{
3555 struct strbuf errmsg = STRBUF_INIT;
3556 if (parse_dirstat_params(options, params, &errmsg))
3557 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3558 errmsg.buf);
3559 strbuf_release(&errmsg);
3560 /*
3561 * The caller knows a dirstat-related option is given from the command
3562 * line; allow it to say "return this_function();"
3563 */
3564 options->output_format |= DIFF_FORMAT_DIRSTAT;
3565 return 1;
3566}
3567static int parse_submodule_opt(struct diff_options *options, const char *value)
3569{
3570 if (parse_submodule_params(options, value))
3571 die(_("Failed to parse --submodule option parameter: '%s'"),
3572 value);
3573 return 1;
3574}
3575static const char diff_status_letters[] = {
3577 DIFF_STATUS_ADDED,
3578 DIFF_STATUS_COPIED,
3579 DIFF_STATUS_DELETED,
3580 DIFF_STATUS_MODIFIED,
3581 DIFF_STATUS_RENAMED,
3582 DIFF_STATUS_TYPE_CHANGED,
3583 DIFF_STATUS_UNKNOWN,
3584 DIFF_STATUS_UNMERGED,
3585 DIFF_STATUS_FILTER_AON,
3586 DIFF_STATUS_FILTER_BROKEN,
3587 '\0',
3588};
3589static unsigned int filter_bit['Z' + 1];
3591static void prepare_filter_bits(void)
3593{
3594 int i;
3595 if (!filter_bit[DIFF_STATUS_ADDED]) {
3597 for (i = 0; diff_status_letters[i]; i++)
3598 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3599 }
3600}
3601static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3603{
3604 return opt->filter & filter_bit[(int) status];
3605}
3606static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3608{
3609 int i, optch;
3610 prepare_filter_bits();
3612 /*
3614 * If there is a negation e.g. 'd' in the input, and we haven't
3615 * initialized the filter field with another --diff-filter, start
3616 * from full set of bits, except for AON.
3617 */
3618 if (!opt->filter) {
3619 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3620 if (optch < 'a' || 'z' < optch)
3621 continue;
3622 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3623 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3624 break;
3625 }
3626 }
3627 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3629 unsigned int bit;
3630 int negate;
3631 if ('a' <= optch && optch <= 'z') {
3633 negate = 1;
3634 optch = toupper(optch);
3635 } else {
3636 negate = 0;
3637 }
3638 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3640 if (!bit)
3641 return optarg[i];
3642 if (negate)
3643 opt->filter &= ~bit;
3644 else
3645 opt->filter |= bit;
3646 }
3647 return 0;
3648}
3649static void enable_patch_output(int *fmt) {
3651 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3652 *fmt |= DIFF_FORMAT_PATCH;
3653}
3654static int parse_one_token(const char **arg, const char *token)
3656{
3657 const char *rest;
3658 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
3659 *arg = rest;
3660 return 1;
3661 }
3662 return 0;
3663}
3664static int parse_ws_error_highlight(struct diff_options *opt, const char *arg)
3666{
3667 const char *orig_arg = arg;
3668 unsigned val = 0;
3669 while (*arg) {
3670 if (parse_one_token(&arg, "none"))
3671 val = 0;
3672 else if (parse_one_token(&arg, "default"))
3673 val = WSEH_NEW;
3674 else if (parse_one_token(&arg, "all"))
3675 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
3676 else if (parse_one_token(&arg, "new"))
3677 val |= WSEH_NEW;
3678 else if (parse_one_token(&arg, "old"))
3679 val |= WSEH_OLD;
3680 else if (parse_one_token(&arg, "context"))
3681 val |= WSEH_CONTEXT;
3682 else {
3683 error("unknown value after ws-error-highlight=%.*s",
3684 (int)(arg - orig_arg), orig_arg);
3685 return 0;
3686 }
3687 if (*arg)
3688 arg++;
3689 }
3690 opt->ws_error_highlight = val;
3691 return 1;
3692}
3693int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3695{
3696 const char *arg = av[0];
3697 const char *optarg;
3698 int argcount;
3699 /* Output format options */
3701 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3702 || opt_arg(arg, 'U', "unified", &options->context))
3703 enable_patch_output(&options->output_format);
3704 else if (!strcmp(arg, "--raw"))
3705 options->output_format |= DIFF_FORMAT_RAW;
3706 else if (!strcmp(arg, "--patch-with-raw")) {
3707 enable_patch_output(&options->output_format);
3708 options->output_format |= DIFF_FORMAT_RAW;
3709 } else if (!strcmp(arg, "--numstat"))
3710 options->output_format |= DIFF_FORMAT_NUMSTAT;
3711 else if (!strcmp(arg, "--shortstat"))
3712 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3713 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3714 return parse_dirstat_opt(options, "");
3715 else if (skip_prefix(arg, "-X", &arg))
3716 return parse_dirstat_opt(options, arg);
3717 else if (skip_prefix(arg, "--dirstat=", &arg))
3718 return parse_dirstat_opt(options, arg);
3719 else if (!strcmp(arg, "--cumulative"))
3720 return parse_dirstat_opt(options, "cumulative");
3721 else if (!strcmp(arg, "--dirstat-by-file"))
3722 return parse_dirstat_opt(options, "files");
3723 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3724 parse_dirstat_opt(options, "files");
3725 return parse_dirstat_opt(options, arg);
3726 }
3727 else if (!strcmp(arg, "--check"))
3728 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3729 else if (!strcmp(arg, "--summary"))
3730 options->output_format |= DIFF_FORMAT_SUMMARY;
3731 else if (!strcmp(arg, "--patch-with-stat")) {
3732 enable_patch_output(&options->output_format);
3733 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3734 } else if (!strcmp(arg, "--name-only"))
3735 options->output_format |= DIFF_FORMAT_NAME;
3736 else if (!strcmp(arg, "--name-status"))
3737 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3738 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3739 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3740 else if (starts_with(arg, "--stat"))
3741 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3742 return stat_opt(options, av);
3743 /* renames options */
3745 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3746 !strcmp(arg, "--break-rewrites")) {
3747 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3748 return error("invalid argument to -B: %s", arg+2);
3749 }
3750 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3751 !strcmp(arg, "--find-renames")) {
3752 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3753 return error("invalid argument to -M: %s", arg+2);
3754 options->detect_rename = DIFF_DETECT_RENAME;
3755 }
3756 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3757 options->irreversible_delete = 1;
3758 }
3759 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3760 !strcmp(arg, "--find-copies")) {
3761 if (options->detect_rename == DIFF_DETECT_COPY)
3762 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3763 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3764 return error("invalid argument to -C: %s", arg+2);
3765 options->detect_rename = DIFF_DETECT_COPY;
3766 }
3767 else if (!strcmp(arg, "--no-renames"))
3768 options->detect_rename = 0;
3769 else if (!strcmp(arg, "--rename-empty"))
3770 DIFF_OPT_SET(options, RENAME_EMPTY);
3771 else if (!strcmp(arg, "--no-rename-empty"))
3772 DIFF_OPT_CLR(options, RENAME_EMPTY);
3773 else if (!strcmp(arg, "--relative"))
3774 DIFF_OPT_SET(options, RELATIVE_NAME);
3775 else if (skip_prefix(arg, "--relative=", &arg)) {
3776 DIFF_OPT_SET(options, RELATIVE_NAME);
3777 options->prefix = arg;
3778 }
3779 /* xdiff options */
3781 else if (!strcmp(arg, "--minimal"))
3782 DIFF_XDL_SET(options, NEED_MINIMAL);
3783 else if (!strcmp(arg, "--no-minimal"))
3784 DIFF_XDL_CLR(options, NEED_MINIMAL);
3785 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3786 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3787 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3788 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3789 else if (!strcmp(arg, "--ignore-space-at-eol"))
3790 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3791 else if (!strcmp(arg, "--ignore-blank-lines"))
3792 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3793 else if (!strcmp(arg, "--patience"))
3794 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3795 else if (!strcmp(arg, "--histogram"))
3796 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3797 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3798 long value = parse_algorithm_value(optarg);
3799 if (value < 0)
3800 return error("option diff-algorithm accepts \"myers\", "
3801 "\"minimal\", \"patience\" and \"histogram\"");
3802 /* clear out previous settings */
3803 DIFF_XDL_CLR(options, NEED_MINIMAL);
3804 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3805 options->xdl_opts |= value;
3806 return argcount;
3807 }
3808 /* flags options */
3810 else if (!strcmp(arg, "--binary")) {
3811 enable_patch_output(&options->output_format);
3812 DIFF_OPT_SET(options, BINARY);
3813 }
3814 else if (!strcmp(arg, "--full-index"))
3815 DIFF_OPT_SET(options, FULL_INDEX);
3816 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3817 DIFF_OPT_SET(options, TEXT);
3818 else if (!strcmp(arg, "-R"))
3819 DIFF_OPT_SET(options, REVERSE_DIFF);
3820 else if (!strcmp(arg, "--find-copies-harder"))
3821 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3822 else if (!strcmp(arg, "--follow"))
3823 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3824 else if (!strcmp(arg, "--no-follow")) {
3825 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3826 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
3827 } else if (!strcmp(arg, "--color"))
3828 options->use_color = 1;
3829 else if (skip_prefix(arg, "--color=", &arg)) {
3830 int value = git_config_colorbool(NULL, arg);
3831 if (value < 0)
3832 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3833 options->use_color = value;
3834 }
3835 else if (!strcmp(arg, "--no-color"))
3836 options->use_color = 0;
3837 else if (!strcmp(arg, "--color-words")) {
3838 options->use_color = 1;
3839 options->word_diff = DIFF_WORDS_COLOR;
3840 }
3841 else if (skip_prefix(arg, "--color-words=", &arg)) {
3842 options->use_color = 1;
3843 options->word_diff = DIFF_WORDS_COLOR;
3844 options->word_regex = arg;
3845 }
3846 else if (!strcmp(arg, "--word-diff")) {
3847 if (options->word_diff == DIFF_WORDS_NONE)
3848 options->word_diff = DIFF_WORDS_PLAIN;
3849 }
3850 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3851 if (!strcmp(arg, "plain"))
3852 options->word_diff = DIFF_WORDS_PLAIN;
3853 else if (!strcmp(arg, "color")) {
3854 options->use_color = 1;
3855 options->word_diff = DIFF_WORDS_COLOR;
3856 }
3857 else if (!strcmp(arg, "porcelain"))
3858 options->word_diff = DIFF_WORDS_PORCELAIN;
3859 else if (!strcmp(arg, "none"))
3860 options->word_diff = DIFF_WORDS_NONE;
3861 else
3862 die("bad --word-diff argument: %s", arg);
3863 }
3864 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3865 if (options->word_diff == DIFF_WORDS_NONE)
3866 options->word_diff = DIFF_WORDS_PLAIN;
3867 options->word_regex = optarg;
3868 return argcount;
3869 }
3870 else if (!strcmp(arg, "--exit-code"))
3871 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3872 else if (!strcmp(arg, "--quiet"))
3873 DIFF_OPT_SET(options, QUICK);
3874 else if (!strcmp(arg, "--ext-diff"))
3875 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3876 else if (!strcmp(arg, "--no-ext-diff"))
3877 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3878 else if (!strcmp(arg, "--textconv"))
3879 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3880 else if (!strcmp(arg, "--no-textconv"))
3881 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3882 else if (!strcmp(arg, "--ignore-submodules")) {
3883 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3884 handle_ignore_submodules_arg(options, "all");
3885 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3886 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3887 handle_ignore_submodules_arg(options, arg);
3888 } else if (!strcmp(arg, "--submodule"))
3889 DIFF_OPT_SET(options, SUBMODULE_LOG);
3890 else if (skip_prefix(arg, "--submodule=", &arg))
3891 return parse_submodule_opt(options, arg);
3892 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
3893 return parse_ws_error_highlight(options, arg);
3894 /* misc options */
3896 else if (!strcmp(arg, "-z"))
3897 options->line_termination = 0;
3898 else if ((argcount = short_opt('l', av, &optarg))) {
3899 options->rename_limit = strtoul(optarg, NULL, 10);
3900 return argcount;
3901 }
3902 else if ((argcount = short_opt('S', av, &optarg))) {
3903 options->pickaxe = optarg;
3904 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3905 return argcount;
3906 } else if ((argcount = short_opt('G', av, &optarg))) {
3907 options->pickaxe = optarg;
3908 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3909 return argcount;
3910 }
3911 else if (!strcmp(arg, "--pickaxe-all"))
3912 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3913 else if (!strcmp(arg, "--pickaxe-regex"))
3914 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3915 else if ((argcount = short_opt('O', av, &optarg))) {
3916 options->orderfile = optarg;
3917 return argcount;
3918 }
3919 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3920 int offending = parse_diff_filter_opt(optarg, options);
3921 if (offending)
3922 die("unknown change class '%c' in --diff-filter=%s",
3923 offending, optarg);
3924 return argcount;
3925 }
3926 else if (!strcmp(arg, "--abbrev"))
3927 options->abbrev = DEFAULT_ABBREV;
3928 else if (skip_prefix(arg, "--abbrev=", &arg)) {
3929 options->abbrev = strtoul(arg, NULL, 10);
3930 if (options->abbrev < MINIMUM_ABBREV)
3931 options->abbrev = MINIMUM_ABBREV;
3932 else if (40 < options->abbrev)
3933 options->abbrev = 40;
3934 }
3935 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3936 options->a_prefix = optarg;
3937 return argcount;
3938 }
3939 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3940 options->b_prefix = optarg;
3941 return argcount;
3942 }
3943 else if (!strcmp(arg, "--no-prefix"))
3944 options->a_prefix = options->b_prefix = "";
3945 else if (opt_arg(arg, '\0', "inter-hunk-context",
3946 &options->interhunkcontext))
3947 ;
3948 else if (!strcmp(arg, "-W"))
3949 DIFF_OPT_SET(options, FUNCCONTEXT);
3950 else if (!strcmp(arg, "--function-context"))
3951 DIFF_OPT_SET(options, FUNCCONTEXT);
3952 else if (!strcmp(arg, "--no-function-context"))
3953 DIFF_OPT_CLR(options, FUNCCONTEXT);
3954 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3955 options->file = fopen(optarg, "w");
3956 if (!options->file)
3957 die_errno("Could not open '%s'", optarg);
3958 options->close_file = 1;
3959 return argcount;
3960 } else
3961 return 0;
3962 return 1;
3963}
3964int parse_rename_score(const char **cp_p)
3966{
3967 unsigned long num, scale;
3968 int ch, dot;
3969 const char *cp = *cp_p;
3970 num = 0;
3972 scale = 1;
3973 dot = 0;
3974 for (;;) {
3975 ch = *cp;
3976 if ( !dot && ch == '.' ) {
3977 scale = 1;
3978 dot = 1;
3979 } else if ( ch == '%' ) {
3980 scale = dot ? scale*100 : 100;
3981 cp++; /* % is always at the end */
3982 break;
3983 } else if ( ch >= '0' && ch <= '9' ) {
3984 if ( scale < 100000 ) {
3985 scale *= 10;
3986 num = (num*10) + (ch-'0');
3987 }
3988 } else {
3989 break;
3990 }
3991 cp++;
3992 }
3993 *cp_p = cp;
3994 /* user says num divided by scale and we say internally that
3996 * is MAX_SCORE * num / scale.
3997 */
3998 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3999}
4000static int diff_scoreopt_parse(const char *opt)
4002{
4003 int opt1, opt2, cmd;
4004 if (*opt++ != '-')
4006 return -1;
4007 cmd = *opt++;
4008 if (cmd == '-') {
4009 /* convert the long-form arguments into short-form versions */
4010 if (skip_prefix(opt, "break-rewrites", &opt)) {
4011 if (*opt == 0 || *opt++ == '=')
4012 cmd = 'B';
4013 } else if (skip_prefix(opt, "find-copies", &opt)) {
4014 if (*opt == 0 || *opt++ == '=')
4015 cmd = 'C';
4016 } else if (skip_prefix(opt, "find-renames", &opt)) {
4017 if (*opt == 0 || *opt++ == '=')
4018 cmd = 'M';
4019 }
4020 }
4021 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4022 return -1; /* that is not a -M, -C, or -B option */
4023 opt1 = parse_rename_score(&opt);
4025 if (cmd != 'B')
4026 opt2 = 0;
4027 else {
4028 if (*opt == 0)
4029 opt2 = 0;
4030 else if (*opt != '/')
4031 return -1; /* we expect -B80/99 or -B80 */
4032 else {
4033 opt++;
4034 opt2 = parse_rename_score(&opt);
4035 }
4036 }
4037 if (*opt != 0)
4038 return -1;
4039 return opt1 | (opt2 << 16);
4040}
4041struct diff_queue_struct diff_queued_diff;
4043void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4045{
4046 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4047 queue->queue[queue->nr++] = dp;
4048}
4049struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4051 struct diff_filespec *one,
4052 struct diff_filespec *two)
4053{
4054 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4055 dp->one = one;
4056 dp->two = two;
4057 if (queue)
4058 diff_q(queue, dp);
4059 return dp;
4060}
4061void diff_free_filepair(struct diff_filepair *p)
4063{
4064 free_filespec(p->one);
4065 free_filespec(p->two);
4066 free(p);
4067}
4068/* This is different from find_unique_abbrev() in that
4070 * it stuffs the result with dots for alignment.
4071 */
4072const char *diff_unique_abbrev(const unsigned char *sha1, int len)
4073{
4074 int abblen;
4075 const char *abbrev;
4076 if (len == 40)
4077 return sha1_to_hex(sha1);
4078 abbrev = find_unique_abbrev(sha1, len);
4080 abblen = strlen(abbrev);
4081 if (abblen < 37) {
4082 static char hex[41];
4083 if (len < abblen && abblen <= len + 2)
4084 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
4085 else
4086 sprintf(hex, "%s...", abbrev);
4087 return hex;
4088 }
4089 return sha1_to_hex(sha1);
4090}
4091static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4093{
4094 int line_termination = opt->line_termination;
4095 int inter_name_termination = line_termination ? '\t' : '\0';
4096 fprintf(opt->file, "%s", diff_line_prefix(opt));
4098 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4099 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4100 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4101 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4102 }
4103 if (p->score) {
4104 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4105 inter_name_termination);
4106 } else {
4107 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4108 }
4109 if (p->status == DIFF_STATUS_COPIED ||
4111 p->status == DIFF_STATUS_RENAMED) {
4112 const char *name_a, *name_b;
4113 name_a = p->one->path;
4114 name_b = p->two->path;
4115 strip_prefix(opt->prefix_length, &name_a, &name_b);
4116 write_name_quoted(name_a, opt->file, inter_name_termination);
4117 write_name_quoted(name_b, opt->file, line_termination);
4118 } else {
4119 const char *name_a, *name_b;
4120 name_a = p->one->mode ? p->one->path : p->two->path;
4121 name_b = NULL;
4122 strip_prefix(opt->prefix_length, &name_a, &name_b);
4123 write_name_quoted(name_a, opt->file, line_termination);
4124 }
4125}
4126int diff_unmodified_pair(struct diff_filepair *p)
4128{
4129 /* This function is written stricter than necessary to support
4130 * the currently implemented transformers, but the idea is to
4131 * let transformers to produce diff_filepairs any way they want,
4132 * and filter and clean them up here before producing the output.
4133 */
4134 struct diff_filespec *one = p->one, *two = p->two;
4135 if (DIFF_PAIR_UNMERGED(p))
4137 return 0; /* unmerged is interesting */
4138 /* deletion, addition, mode or type change
4140 * and rename are all interesting.
4141 */
4142 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4143 DIFF_PAIR_MODE_CHANGED(p) ||
4144 strcmp(one->path, two->path))
4145 return 0;
4146 /* both are valid and point at the same path. that is, we are
4148 * dealing with a change.
4149 */
4150 if (one->sha1_valid && two->sha1_valid &&
4151 !hashcmp(one->sha1, two->sha1) &&
4152 !one->dirty_submodule && !two->dirty_submodule)
4153 return 1; /* no change */
4154 if (!one->sha1_valid && !two->sha1_valid)
4155 return 1; /* both look at the same file on the filesystem. */
4156 return 0;
4157}
4158static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4160{
4161 if (diff_unmodified_pair(p))
4162 return;
4163 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4165 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4166 return; /* no tree diffs in patch format */
4167 run_diff(p, o);
4169}
4170static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4172 struct diffstat_t *diffstat)
4173{
4174 if (diff_unmodified_pair(p))
4175 return;
4176 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4178 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4179 return; /* no useful stat for tree diffs */
4180 run_diffstat(p, o, diffstat);
4182}
4183static void diff_flush_checkdiff(struct diff_filepair *p,
4185 struct diff_options *o)
4186{
4187 if (diff_unmodified_pair(p))
4188 return;
4189 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4191 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4192 return; /* nothing to check in tree diffs */
4193 run_checkdiff(p, o);
4195}
4196int diff_queue_is_empty(void)
4198{
4199 struct diff_queue_struct *q = &diff_queued_diff;
4200 int i;
4201 for (i = 0; i < q->nr; i++)
4202 if (!diff_unmodified_pair(q->queue[i]))
4203 return 0;
4204 return 1;
4205}
4206#if DIFF_DEBUG
4208void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4209{
4210 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4211 x, one ? one : "",
4212 s->path,
4213 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4214 s->mode,
4215 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4216 fprintf(stderr, "queue[%d] %s size %lu\n",
4217 x, one ? one : "",
4218 s->size);
4219}
4220void diff_debug_filepair(const struct diff_filepair *p, int i)
4222{
4223 diff_debug_filespec(p->one, i, "one");
4224 diff_debug_filespec(p->two, i, "two");
4225 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4226 p->score, p->status ? p->status : '?',
4227 p->one->rename_used, p->broken_pair);
4228}
4229void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4231{
4232 int i;
4233 if (msg)
4234 fprintf(stderr, "%s\n", msg);
4235 fprintf(stderr, "q->nr = %d\n", q->nr);
4236 for (i = 0; i < q->nr; i++) {
4237 struct diff_filepair *p = q->queue[i];
4238 diff_debug_filepair(p, i);
4239 }
4240}
4241#endif
4242static void diff_resolve_rename_copy(void)
4244{
4245 int i;
4246 struct diff_filepair *p;
4247 struct diff_queue_struct *q = &diff_queued_diff;
4248 diff_debug_queue("resolve-rename-copy", q);
4250 for (i = 0; i < q->nr; i++) {
4252 p = q->queue[i];
4253 p->status = 0; /* undecided */
4254 if (DIFF_PAIR_UNMERGED(p))
4255 p->status = DIFF_STATUS_UNMERGED;
4256 else if (!DIFF_FILE_VALID(p->one))
4257 p->status = DIFF_STATUS_ADDED;
4258 else if (!DIFF_FILE_VALID(p->two))
4259 p->status = DIFF_STATUS_DELETED;
4260 else if (DIFF_PAIR_TYPE_CHANGED(p))
4261 p->status = DIFF_STATUS_TYPE_CHANGED;
4262 /* from this point on, we are dealing with a pair
4264 * whose both sides are valid and of the same type, i.e.
4265 * either in-place edit or rename/copy edit.
4266 */
4267 else if (DIFF_PAIR_RENAME(p)) {
4268 /*
4269 * A rename might have re-connected a broken
4270 * pair up, causing the pathnames to be the
4271 * same again. If so, that's not a rename at
4272 * all, just a modification..
4273 *
4274 * Otherwise, see if this source was used for
4275 * multiple renames, in which case we decrement
4276 * the count, and call it a copy.
4277 */
4278 if (!strcmp(p->one->path, p->two->path))
4279 p->status = DIFF_STATUS_MODIFIED;
4280 else if (--p->one->rename_used > 0)
4281 p->status = DIFF_STATUS_COPIED;
4282 else
4283 p->status = DIFF_STATUS_RENAMED;
4284 }
4285 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4286 p->one->mode != p->two->mode ||
4287 p->one->dirty_submodule ||
4288 p->two->dirty_submodule ||
4289 is_null_sha1(p->one->sha1))
4290 p->status = DIFF_STATUS_MODIFIED;
4291 else {
4292 /* This is a "no-change" entry and should not
4293 * happen anymore, but prepare for broken callers.
4294 */
4295 error("feeding unmodified %s to diffcore",
4296 p->one->path);
4297 p->status = DIFF_STATUS_UNKNOWN;
4298 }
4299 }
4300 diff_debug_queue("resolve-rename-copy done", q);
4301}
4302static int check_pair_status(struct diff_filepair *p)
4304{
4305 switch (p->status) {
4306 case DIFF_STATUS_UNKNOWN:
4307 return 0;
4308 case 0:
4309 die("internal error in diff-resolve-rename-copy");
4310 default:
4311 return 1;
4312 }
4313}
4314static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4316{
4317 int fmt = opt->output_format;
4318 if (fmt & DIFF_FORMAT_CHECKDIFF)
4320 diff_flush_checkdiff(p, opt);
4321 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4322 diff_flush_raw(p, opt);
4323 else if (fmt & DIFF_FORMAT_NAME) {
4324 const char *name_a, *name_b;
4325 name_a = p->two->path;
4326 name_b = NULL;
4327 strip_prefix(opt->prefix_length, &name_a, &name_b);
4328 write_name_quoted(name_a, opt->file, opt->line_termination);
4329 }
4330}
4331static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4333{
4334 if (fs->mode)
4335 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4336 else
4337 fprintf(file, " %s ", newdelete);
4338 write_name_quoted(fs->path, file, '\n');
4339}
4340static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4343 const char *line_prefix)
4344{
4345 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4346 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4347 p->two->mode, show_name ? ' ' : '\n');
4348 if (show_name) {
4349 write_name_quoted(p->two->path, file, '\n');
4350 }
4351 }
4352}
4353static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4355 const char *line_prefix)
4356{
4357 char *names = pprint_rename(p->one->path, p->two->path);
4358 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4360 free(names);
4361 show_mode_change(file, p, 0, line_prefix);
4362}
4363static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4365{
4366 FILE *file = opt->file;
4367 const char *line_prefix = diff_line_prefix(opt);
4368 switch(p->status) {
4370 case DIFF_STATUS_DELETED:
4371 fputs(line_prefix, file);
4372 show_file_mode_name(file, "delete", p->one);
4373 break;
4374 case DIFF_STATUS_ADDED:
4375 fputs(line_prefix, file);
4376 show_file_mode_name(file, "create", p->two);
4377 break;
4378 case DIFF_STATUS_COPIED:
4379 fputs(line_prefix, file);
4380 show_rename_copy(file, "copy", p, line_prefix);
4381 break;
4382 case DIFF_STATUS_RENAMED:
4383 fputs(line_prefix, file);
4384 show_rename_copy(file, "rename", p, line_prefix);
4385 break;
4386 default:
4387 if (p->score) {
4388 fprintf(file, "%s rewrite ", line_prefix);
4389 write_name_quoted(p->two->path, file, ' ');
4390 fprintf(file, "(%d%%)\n", similarity_index(p));
4391 }
4392 show_mode_change(file, p, !p->score, line_prefix);
4393 break;
4394 }
4395}
4396struct patch_id_t {
4398 git_SHA_CTX *ctx;
4399 int patchlen;
4400};
4401static int remove_space(char *line, int len)
4403{
4404 int i;
4405 char *dst = line;
4406 unsigned char c;
4407 for (i = 0; i < len; i++)
4409 if (!isspace((c = line[i])))
4410 *dst++ = c;
4411 return dst - line;
4413}
4414static void patch_id_consume(void *priv, char *line, unsigned long len)
4416{
4417 struct patch_id_t *data = priv;
4418 int new_len;
4419 /* Ignore line numbers when computing the SHA1 of the patch */
4421 if (starts_with(line, "@@ -"))
4422 return;
4423 new_len = remove_space(line, len);
4425 git_SHA1_Update(data->ctx, line, new_len);
4427 data->patchlen += new_len;
4428}
4429/* returns 0 upon success, and writes result into sha1 */
4431static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4432{
4433 struct diff_queue_struct *q = &diff_queued_diff;
4434 int i;
4435 git_SHA_CTX ctx;
4436 struct patch_id_t data;
4437 char buffer[PATH_MAX * 4 + 20];
4438 git_SHA1_Init(&ctx);
4440 memset(&data, 0, sizeof(struct patch_id_t));
4441 data.ctx = &ctx;
4442 for (i = 0; i < q->nr; i++) {
4444 xpparam_t xpp;
4445 xdemitconf_t xecfg;
4446 mmfile_t mf1, mf2;
4447 struct diff_filepair *p = q->queue[i];
4448 int len1, len2;
4449 memset(&xpp, 0, sizeof(xpp));
4451 memset(&xecfg, 0, sizeof(xecfg));
4452 if (p->status == 0)
4453 return error("internal diff status error");
4454 if (p->status == DIFF_STATUS_UNKNOWN)
4455 continue;
4456 if (diff_unmodified_pair(p))
4457 continue;
4458 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4459 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4460 continue;
4461 if (DIFF_PAIR_UNMERGED(p))
4462 continue;
4463 diff_fill_sha1_info(p->one);
4465 diff_fill_sha1_info(p->two);
4466 if (fill_mmfile(&mf1, p->one) < 0 ||
4467 fill_mmfile(&mf2, p->two) < 0)
4468 return error("unable to read files to diff");
4469 len1 = remove_space(p->one->path, strlen(p->one->path));
4471 len2 = remove_space(p->two->path, strlen(p->two->path));
4472 if (p->one->mode == 0)
4473 len1 = snprintf(buffer, sizeof(buffer),
4474 "diff--gita/%.*sb/%.*s"
4475 "newfilemode%06o"
4476 "---/dev/null"
4477 "+++b/%.*s",
4478 len1, p->one->path,
4479 len2, p->two->path,
4480 p->two->mode,
4481 len2, p->two->path);
4482 else if (p->two->mode == 0)
4483 len1 = snprintf(buffer, sizeof(buffer),
4484 "diff--gita/%.*sb/%.*s"
4485 "deletedfilemode%06o"
4486 "---a/%.*s"
4487 "+++/dev/null",
4488 len1, p->one->path,
4489 len2, p->two->path,
4490 p->one->mode,
4491 len1, p->one->path);
4492 else
4493 len1 = snprintf(buffer, sizeof(buffer),
4494 "diff--gita/%.*sb/%.*s"
4495 "---a/%.*s"
4496 "+++b/%.*s",
4497 len1, p->one->path,
4498 len2, p->two->path,
4499 len1, p->one->path,
4500 len2, p->two->path);
4501 git_SHA1_Update(&ctx, buffer, len1);
4502 if (diff_filespec_is_binary(p->one) ||
4504 diff_filespec_is_binary(p->two)) {
4505 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4506 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4507 continue;
4508 }
4509 xpp.flags = 0;
4511 xecfg.ctxlen = 3;
4512 xecfg.flags = 0;
4513 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4514 &xpp, &xecfg);
4515 }
4516 git_SHA1_Final(sha1, &ctx);
4518 return 0;
4519}
4520int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4522{
4523 struct diff_queue_struct *q = &diff_queued_diff;
4524 int i;
4525 int result = diff_get_patch_id(options, sha1);
4526 for (i = 0; i < q->nr; i++)
4528 diff_free_filepair(q->queue[i]);
4529 free(q->queue);
4531 DIFF_QUEUE_CLEAR(q);
4532 return result;
4534}
4535static int is_summary_empty(const struct diff_queue_struct *q)
4537{
4538 int i;
4539 for (i = 0; i < q->nr; i++) {
4541 const struct diff_filepair *p = q->queue[i];
4542 switch (p->status) {
4544 case DIFF_STATUS_DELETED:
4545 case DIFF_STATUS_ADDED:
4546 case DIFF_STATUS_COPIED:
4547 case DIFF_STATUS_RENAMED:
4548 return 0;
4549 default:
4550 if (p->score)
4551 return 0;
4552 if (p->one->mode && p->two->mode &&
4553 p->one->mode != p->two->mode)
4554 return 0;
4555 break;
4556 }
4557 }
4558 return 1;
4559}
4560static const char rename_limit_warning[] =
4562"inexact rename detection was skipped due to too many files.";
4563static const char degrade_cc_to_c_warning[] =
4565"only found copies from modified paths due to too many files.";
4566static const char rename_limit_advice[] =
4568"you may want to set your %s variable to at least "
4569"%d and retry the command.";
4570void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4572{
4573 if (degraded_cc)
4574 warning(degrade_cc_to_c_warning);
4575 else if (needed)
4576 warning(rename_limit_warning);
4577 else
4578 return;
4579 if (0 < needed && needed < 32767)
4580 warning(rename_limit_advice, varname, needed);
4581}
4582void diff_flush(struct diff_options *options)
4584{
4585 struct diff_queue_struct *q = &diff_queued_diff;
4586 int i, output_format = options->output_format;
4587 int separator = 0;
4588 int dirstat_by_line = 0;
4589 /*
4591 * Order: raw, stat, summary, patch
4592 * or: name/name-status/checkdiff (other bits clear)
4593 */
4594 if (!q->nr)
4595 goto free_queue;
4596 if (output_format & (DIFF_FORMAT_RAW |
4598 DIFF_FORMAT_NAME |
4599 DIFF_FORMAT_NAME_STATUS |
4600 DIFF_FORMAT_CHECKDIFF)) {
4601 for (i = 0; i < q->nr; i++) {
4602 struct diff_filepair *p = q->queue[i];
4603 if (check_pair_status(p))
4604 flush_one_pair(p, options);
4605 }
4606 separator++;
4607 }
4608 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4610 dirstat_by_line = 1;
4611 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4613 dirstat_by_line) {
4614 struct diffstat_t diffstat;
4615 memset(&diffstat, 0, sizeof(struct diffstat_t));
4617 for (i = 0; i < q->nr; i++) {
4618 struct diff_filepair *p = q->queue[i];
4619 if (check_pair_status(p))
4620 diff_flush_stat(p, options, &diffstat);
4621 }
4622 if (output_format & DIFF_FORMAT_NUMSTAT)
4623 show_numstat(&diffstat, options);
4624 if (output_format & DIFF_FORMAT_DIFFSTAT)
4625 show_stats(&diffstat, options);
4626 if (output_format & DIFF_FORMAT_SHORTSTAT)
4627 show_shortstats(&diffstat, options);
4628 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
4629 show_dirstat_by_line(&diffstat, options);
4630 free_diffstat_info(&diffstat);
4631 separator++;
4632 }
4633 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4634 show_dirstat(options);
4635 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4637 for (i = 0; i < q->nr; i++) {
4638 diff_summary(options, q->queue[i]);
4639 }
4640 separator++;
4641 }
4642 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4644 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4645 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4646 /*
4647 * run diff_flush_patch for the exit status. setting
4648 * options->file to /dev/null should be safe, because we
4649 * aren't supposed to produce any output anyway.
4650 */
4651 if (options->close_file)
4652 fclose(options->file);
4653 options->file = fopen("/dev/null", "w");
4654 if (!options->file)
4655 die_errno("Could not open /dev/null");
4656 options->close_file = 1;
4657 for (i = 0; i < q->nr; i++) {
4658 struct diff_filepair *p = q->queue[i];
4659 if (check_pair_status(p))
4660 diff_flush_patch(p, options);
4661 if (options->found_changes)
4662 break;
4663 }
4664 }
4665 if (output_format & DIFF_FORMAT_PATCH) {
4667 if (separator) {
4668 fprintf(options->file, "%s%c",
4669 diff_line_prefix(options),
4670 options->line_termination);
4671 if (options->stat_sep) {
4672 /* attach patch instead of inline */
4673 fputs(options->stat_sep, options->file);
4674 }
4675 }
4676 for (i = 0; i < q->nr; i++) {
4678 struct diff_filepair *p = q->queue[i];
4679 if (check_pair_status(p))
4680 diff_flush_patch(p, options);
4681 }
4682 }
4683 if (output_format & DIFF_FORMAT_CALLBACK)
4685 options->format_callback(q, options, options->format_callback_data);
4686 for (i = 0; i < q->nr; i++)
4688 diff_free_filepair(q->queue[i]);
4689free_queue:
4690 free(q->queue);
4691 DIFF_QUEUE_CLEAR(q);
4692 if (options->close_file)
4693 fclose(options->file);
4694 /*
4696 * Report the content-level differences with HAS_CHANGES;
4697 * diff_addremove/diff_change does not set the bit when
4698 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4699 */
4700 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4701 if (options->found_changes)
4702 DIFF_OPT_SET(options, HAS_CHANGES);
4703 else
4704 DIFF_OPT_CLR(options, HAS_CHANGES);
4705 }
4706}
4707static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4709{
4710 return (((p->status == DIFF_STATUS_MODIFIED) &&
4711 ((p->score &&
4712 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4713 (!p->score &&
4714 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4715 ((p->status != DIFF_STATUS_MODIFIED) &&
4716 filter_bit_tst(p->status, options)));
4717}
4718static void diffcore_apply_filter(struct diff_options *options)
4720{
4721 int i;
4722 struct diff_queue_struct *q = &diff_queued_diff;
4723 struct diff_queue_struct outq;
4724 DIFF_QUEUE_CLEAR(&outq);
4726 if (!options->filter)
4728 return;
4729 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4731 int found;
4732 for (i = found = 0; !found && i < q->nr; i++) {
4733 if (match_filter(options, q->queue[i]))
4734 found++;
4735 }
4736 if (found)
4737 return;
4738 /* otherwise we will clear the whole queue
4740 * by copying the empty outq at the end of this
4741 * function, but first clear the current entries
4742 * in the queue.
4743 */
4744 for (i = 0; i < q->nr; i++)
4745 diff_free_filepair(q->queue[i]);
4746 }
4747 else {
4748 /* Only the matching ones */
4749 for (i = 0; i < q->nr; i++) {
4750 struct diff_filepair *p = q->queue[i];
4751 if (match_filter(options, p))
4752 diff_q(&outq, p);
4753 else
4754 diff_free_filepair(p);
4755 }
4756 }
4757 free(q->queue);
4758 *q = outq;
4759}
4760/* Check whether two filespecs with the same mode and size are identical */
4762static int diff_filespec_is_identical(struct diff_filespec *one,
4763 struct diff_filespec *two)
4764{
4765 if (S_ISGITLINK(one->mode))
4766 return 0;
4767 if (diff_populate_filespec(one, 0))
4768 return 0;
4769 if (diff_populate_filespec(two, 0))
4770 return 0;
4771 return !memcmp(one->data, two->data, one->size);
4772}
4773static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4775{
4776 if (p->done_skip_stat_unmatch)
4777 return p->skip_stat_unmatch_result;
4778 p->done_skip_stat_unmatch = 1;
4780 p->skip_stat_unmatch_result = 0;
4781 /*
4782 * 1. Entries that come from stat info dirtiness
4783 * always have both sides (iow, not create/delete),
4784 * one side of the object name is unknown, with
4785 * the same mode and size. Keep the ones that
4786 * do not match these criteria. They have real
4787 * differences.
4788 *
4789 * 2. At this point, the file is known to be modified,
4790 * with the same mode and size, and the object
4791 * name of one side is unknown. Need to inspect
4792 * the identical contents.
4793 */
4794 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4795 !DIFF_FILE_VALID(p->two) ||
4796 (p->one->sha1_valid && p->two->sha1_valid) ||
4797 (p->one->mode != p->two->mode) ||
4798 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
4799 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
4800 (p->one->size != p->two->size) ||
4801 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4802 p->skip_stat_unmatch_result = 1;
4803 return p->skip_stat_unmatch_result;
4804}
4805static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4807{
4808 int i;
4809 struct diff_queue_struct *q = &diff_queued_diff;
4810 struct diff_queue_struct outq;
4811 DIFF_QUEUE_CLEAR(&outq);
4812 for (i = 0; i < q->nr; i++) {
4814 struct diff_filepair *p = q->queue[i];
4815 if (diff_filespec_check_stat_unmatch(p))
4817 diff_q(&outq, p);
4818 else {
4819 /*
4820 * The caller can subtract 1 from skip_stat_unmatch
4821 * to determine how many paths were dirty only
4822 * due to stat info mismatch.
4823 */
4824 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4825 diffopt->skip_stat_unmatch++;
4826 diff_free_filepair(p);
4827 }
4828 }
4829 free(q->queue);
4830 *q = outq;
4831}
4832static int diffnamecmp(const void *a_, const void *b_)
4834{
4835 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4836 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4837 const char *name_a, *name_b;
4838 name_a = a->one ? a->one->path : a->two->path;
4840 name_b = b->one ? b->one->path : b->two->path;
4841 return strcmp(name_a, name_b);
4842}
4843void diffcore_fix_diff_index(struct diff_options *options)
4845{
4846 struct diff_queue_struct *q = &diff_queued_diff;
4847 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4848}
4849void diffcore_std(struct diff_options *options)
4851{
4852 /* NOTE please keep the following in sync with diff_tree_combined() */
4853 if (options->skip_stat_unmatch)
4854 diffcore_skip_stat_unmatch(options);
4855 if (!options->found_follow) {
4856 /* See try_to_follow_renames() in tree-diff.c */
4857 if (options->break_opt != -1)
4858 diffcore_break(options->break_opt);
4859 if (options->detect_rename)
4860 diffcore_rename(options);
4861 if (options->break_opt != -1)
4862 diffcore_merge_broken();
4863 }
4864 if (options->pickaxe)
4865 diffcore_pickaxe(options);
4866 if (options->orderfile)
4867 diffcore_order(options->orderfile);
4868 if (!options->found_follow)
4869 /* See try_to_follow_renames() in tree-diff.c */
4870 diff_resolve_rename_copy();
4871 diffcore_apply_filter(options);
4872 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4874 DIFF_OPT_SET(options, HAS_CHANGES);
4875 else
4876 DIFF_OPT_CLR(options, HAS_CHANGES);
4877 options->found_follow = 0;
4879}
4880int diff_result_code(struct diff_options *opt, int status)
4882{
4883 int result = 0;
4884 diff_warn_rename_limit("diff.renameLimit",
4886 opt->needed_rename_limit,
4887 opt->degraded_cc_to_c);
4888 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4889 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4890 return status;
4891 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4892 DIFF_OPT_TST(opt, HAS_CHANGES))
4893 result |= 01;
4894 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4895 DIFF_OPT_TST(opt, CHECK_FAILED))
4896 result |= 02;
4897 return result;
4898}
4899int diff_can_quit_early(struct diff_options *opt)
4901{
4902 return (DIFF_OPT_TST(opt, QUICK) &&
4903 !opt->filter &&
4904 DIFF_OPT_TST(opt, HAS_CHANGES));
4905}
4906/*
4908 * Shall changes to this submodule be ignored?
4909 *
4910 * Submodule changes can be configured to be ignored separately for each path,
4911 * but that configuration can be overridden from the command line.
4912 */
4913static int is_submodule_ignored(const char *path, struct diff_options *options)
4914{
4915 int ignored = 0;
4916 unsigned orig_flags = options->flags;
4917 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4918 set_diffopt_flags_from_submodule_config(options, path);
4919 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4920 ignored = 1;
4921 options->flags = orig_flags;
4922 return ignored;
4923}
4924void diff_addremove(struct diff_options *options,
4926 int addremove, unsigned mode,
4927 const unsigned char *sha1,
4928 int sha1_valid,
4929 const char *concatpath, unsigned dirty_submodule)
4930{
4931 struct diff_filespec *one, *two;
4932 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4934 return;
4935 /* This may look odd, but it is a preparation for
4937 * feeding "there are unchanged files which should
4938 * not produce diffs, but when you are doing copy
4939 * detection you would need them, so here they are"
4940 * entries to the diff-core. They will be prefixed
4941 * with something like '=' or '*' (I haven't decided
4942 * which but should not make any difference).
4943 * Feeding the same new and old to diff_change()
4944 * also has the same effect.
4945 * Before the final output happens, they are pruned after
4946 * merged into rename/copy pairs as appropriate.
4947 */
4948 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4949 addremove = (addremove == '+' ? '-' :
4950 addremove == '-' ? '+' : addremove);
4951 if (options->prefix &&
4953 strncmp(concatpath, options->prefix, options->prefix_length))
4954 return;
4955 one = alloc_filespec(concatpath);
4957 two = alloc_filespec(concatpath);
4958 if (addremove != '+')
4960 fill_filespec(one, sha1, sha1_valid, mode);
4961 if (addremove != '-') {
4962 fill_filespec(two, sha1, sha1_valid, mode);
4963 two->dirty_submodule = dirty_submodule;
4964 }
4965 diff_queue(&diff_queued_diff, one, two);
4967 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4968 DIFF_OPT_SET(options, HAS_CHANGES);
4969}
4970void diff_change(struct diff_options *options,
4972 unsigned old_mode, unsigned new_mode,
4973 const unsigned char *old_sha1,
4974 const unsigned char *new_sha1,
4975 int old_sha1_valid, int new_sha1_valid,
4976 const char *concatpath,
4977 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4978{
4979 struct diff_filespec *one, *two;
4980 struct diff_filepair *p;
4981 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4983 is_submodule_ignored(concatpath, options))
4984 return;
4985 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4987 unsigned tmp;
4988 const unsigned char *tmp_c;
4989 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4990 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4991 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4992 new_sha1_valid = tmp;
4993 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4994 new_dirty_submodule = tmp;
4995 }
4996 if (options->prefix &&
4998 strncmp(concatpath, options->prefix, options->prefix_length))
4999 return;
5000 one = alloc_filespec(concatpath);
5002 two = alloc_filespec(concatpath);
5003 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
5004 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
5005 one->dirty_submodule = old_dirty_submodule;
5006 two->dirty_submodule = new_dirty_submodule;
5007 p = diff_queue(&diff_queued_diff, one, two);
5008 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5010 return;
5011 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5013 !diff_filespec_check_stat_unmatch(p))
5014 return;
5015 DIFF_OPT_SET(options, HAS_CHANGES);
5017}
5018struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5020{
5021 struct diff_filepair *pair;
5022 struct diff_filespec *one, *two;
5023 if (options->prefix &&
5025 strncmp(path, options->prefix, options->prefix_length))
5026 return NULL;
5027 one = alloc_filespec(path);
5029 two = alloc_filespec(path);
5030 pair = diff_queue(&diff_queued_diff, one, two);
5031 pair->is_unmerged = 1;
5032 return pair;
5033}
5034static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5036 size_t *outsize)
5037{
5038 struct diff_tempfile *temp;
5039 const char *argv[3];
5040 const char **arg = argv;
5041 struct child_process child = CHILD_PROCESS_INIT;
5042 struct strbuf buf = STRBUF_INIT;
5043 int err = 0;
5044 temp = prepare_temp_file(spec->path, spec);
5046 *arg++ = pgm;
5047 *arg++ = temp->name;
5048 *arg = NULL;
5049 child.use_shell = 1;
5051 child.argv = argv;
5052 child.out = -1;
5053 if (start_command(&child)) {
5054 remove_tempfile();
5055 return NULL;
5056 }
5057 if (strbuf_read(&buf, child.out, 0) < 0)
5059 err = error("error reading from textconv command '%s'", pgm);
5060 close(child.out);
5061 if (finish_command(&child) || err) {
5063 strbuf_release(&buf);
5064 remove_tempfile();
5065 return NULL;
5066 }
5067 remove_tempfile();
5068 return strbuf_detach(&buf, outsize);
5070}
5071size_t fill_textconv(struct userdiff_driver *driver,
5073 struct diff_filespec *df,
5074 char **outbuf)
5075{
5076 size_t size;
5077 if (!driver || !driver->textconv) {
5079 if (!DIFF_FILE_VALID(df)) {
5080 *outbuf = "";
5081 return 0;
5082 }
5083 if (diff_populate_filespec(df, 0))
5084 die("unable to read files to diff");
5085 *outbuf = df->data;
5086 return df->size;
5087 }
5088 if (driver->textconv_cache && df->sha1_valid) {
5090 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
5091 &size);
5092 if (*outbuf)
5093 return size;
5094 }
5095 *outbuf = run_textconv(driver->textconv, df, &size);
5097 if (!*outbuf)
5098 die("unable to read files to diff");
5099 if (driver->textconv_cache && df->sha1_valid) {
5101 /* ignore errors, as we might be in a readonly repository */
5102 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5103 size);
5104 /*
5105 * we could save up changes and flush them all at the end,
5106 * but we would need an extra call after all diffing is done.
5107 * Since generating a cache entry is the slow path anyway,
5108 * this extra overhead probably isn't a big deal.
5109 */
5110 notes_cache_write(driver->textconv_cache);
5111 }
5112 return size;
5114}
5115void setup_diff_pager(struct diff_options *opt)
5117{
5118 /*
5119 * If the user asked for our exit code, then either they want --quiet
5120 * or --exit-code. We should definitely not bother with a pager in the
5121 * former case, as we will generate no output. Since we still properly
5122 * report our exit code even when a pager is run, we _could_ run a
5123 * pager with --exit-code. But since we have not done so historically,
5124 * and because it is easy to find people oneline advising "git diff
5125 * --exit-code" in hooks and other scripts, we do not do so.
5126 */
5127 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5128 check_pager_config("diff") != 0)
5129 setup_pager();
5130}