1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4#include "cache.h"
5#include "tempfile.h"
6#include "quote.h"
7#include "diff.h"
8#include "diffcore.h"
9#include "delta.h"
10#include "xdiff-interface.h"
11#include "color.h"
12#include "attr.h"
13#include "run-command.h"
14#include "utf8.h"
15#include "userdiff.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}
311/*
313 * Keep track of files used for diffing. Sometimes such an entry
314 * refers to a temporary file, sometimes to an existing file, and
315 * sometimes to "/dev/null".
316 */
317static struct diff_tempfile {
318 /*
319 * filename external diff should read from, or NULL if this
320 * entry is currently not in use:
321 */
322 const char *name;
323 char hex[GIT_SHA1_HEXSZ + 1];
325 char mode[10];
326 /*
328 * If this diff_tempfile instance refers to a temporary file,
329 * this tempfile object is used to manage its lifetime.
330 */
331 struct tempfile tempfile;
332} diff_temp[2];
333typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
335struct emit_callback {
337 int color_diff;
338 unsigned ws_rule;
339 int blank_at_eof_in_preimage;
340 int blank_at_eof_in_postimage;
341 int lno_in_preimage;
342 int lno_in_postimage;
343 sane_truncate_fn truncate;
344 const char **label_path;
345 struct diff_words_data *diff_words;
346 struct diff_options *opt;
347 int *found_changesp;
348 struct strbuf *header;
349};
350static int count_lines(const char *data, int size)
352{
353 int count, ch, completely_empty = 1, nl_just_seen = 0;
354 count = 0;
355 while (0 < size--) {
356 ch = *data++;
357 if (ch == '\n') {
358 count++;
359 nl_just_seen = 1;
360 completely_empty = 0;
361 }
362 else {
363 nl_just_seen = 0;
364 completely_empty = 0;
365 }
366 }
367 if (completely_empty)
368 return 0;
369 if (!nl_just_seen)
370 count++; /* no trailing newline */
371 return count;
372}
373static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
375{
376 if (!DIFF_FILE_VALID(one)) {
377 mf->ptr = (char *)""; /* does not matter */
378 mf->size = 0;
379 return 0;
380 }
381 else if (diff_populate_filespec(one, 0))
382 return -1;
383 mf->ptr = one->data;
385 mf->size = one->size;
386 return 0;
387}
388/* like fill_mmfile, but only for size, so we can avoid retrieving blob */
390static unsigned long diff_filespec_size(struct diff_filespec *one)
391{
392 if (!DIFF_FILE_VALID(one))
393 return 0;
394 diff_populate_filespec(one, CHECK_SIZE_ONLY);
395 return one->size;
396}
397static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
399{
400 char *ptr = mf->ptr;
401 long size = mf->size;
402 int cnt = 0;
403 if (!size)
405 return cnt;
406 ptr += size - 1; /* pointing at the very end */
407 if (*ptr != '\n')
408 ; /* incomplete line */
409 else
410 ptr--; /* skip the last LF */
411 while (mf->ptr < ptr) {
412 char *prev_eol;
413 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
414 if (*prev_eol == '\n')
415 break;
416 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
417 break;
418 cnt++;
419 ptr = prev_eol - 1;
420 }
421 return cnt;
422}
423static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
425 struct emit_callback *ecbdata)
426{
427 int l1, l2, at;
428 unsigned ws_rule = ecbdata->ws_rule;
429 l1 = count_trailing_blank(mf1, ws_rule);
430 l2 = count_trailing_blank(mf2, ws_rule);
431 if (l2 <= l1) {
432 ecbdata->blank_at_eof_in_preimage = 0;
433 ecbdata->blank_at_eof_in_postimage = 0;
434 return;
435 }
436 at = count_lines(mf1->ptr, mf1->size);
437 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
438 at = count_lines(mf2->ptr, mf2->size);
440 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
441}
442static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
444 int first, const char *line, int len)
445{
446 int has_trailing_newline, has_trailing_carriage_return;
447 int nofirst;
448 FILE *file = o->file;
449 fputs(diff_line_prefix(o), file);
451 if (len == 0) {
453 has_trailing_newline = (first == '\n');
454 has_trailing_carriage_return = (!has_trailing_newline &&
455 (first == '\r'));
456 nofirst = has_trailing_newline || has_trailing_carriage_return;
457 } else {
458 has_trailing_newline = (len > 0 && line[len-1] == '\n');
459 if (has_trailing_newline)
460 len--;
461 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
462 if (has_trailing_carriage_return)
463 len--;
464 nofirst = 0;
465 }
466 if (len || !nofirst) {
468 fputs(set, file);
469 if (!nofirst)
470 fputc(first, file);
471 fwrite(line, len, 1, file);
472 fputs(reset, file);
473 }
474 if (has_trailing_carriage_return)
475 fputc('\r', file);
476 if (has_trailing_newline)
477 fputc('\n', file);
478}
479static void emit_line(struct diff_options *o, const char *set, const char *reset,
481 const char *line, int len)
482{
483 emit_line_0(o, set, reset, line[0], line+1, len-1);
484}
485static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
487{
488 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
489 ecbdata->blank_at_eof_in_preimage &&
490 ecbdata->blank_at_eof_in_postimage &&
491 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
492 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
493 return 0;
494 return ws_blank_line(line, len, ecbdata->ws_rule);
495}
496static void emit_line_checked(const char *reset,
498 struct emit_callback *ecbdata,
499 const char *line, int len,
500 enum color_diff color,
501 unsigned ws_error_highlight,
502 char sign)
503{
504 const char *set = diff_get_color(ecbdata->color_diff, color);
505 const char *ws = NULL;
506 if (ecbdata->opt->ws_error_highlight & ws_error_highlight) {
508 ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
509 if (!*ws)
510 ws = NULL;
511 }
512 if (!ws)
514 emit_line_0(ecbdata->opt, set, reset, sign, line, len);
515 else if (sign == '+' && new_blank_line_at_eof(ecbdata, line, len))
516 /* Blank line at EOF - paint '+' as well */
517 emit_line_0(ecbdata->opt, ws, reset, sign, line, len);
518 else {
519 /* Emit just the prefix, then the rest. */
520 emit_line_0(ecbdata->opt, set, reset, sign, "", 0);
521 ws_check_emit(line, len, ecbdata->ws_rule,
522 ecbdata->opt->file, set, reset, ws);
523 }
524}
525static void emit_add_line(const char *reset,
527 struct emit_callback *ecbdata,
528 const char *line, int len)
529{
530 emit_line_checked(reset, ecbdata, line, len,
531 DIFF_FILE_NEW, WSEH_NEW, '+');
532}
533static void emit_del_line(const char *reset,
535 struct emit_callback *ecbdata,
536 const char *line, int len)
537{
538 emit_line_checked(reset, ecbdata, line, len,
539 DIFF_FILE_OLD, WSEH_OLD, '-');
540}
541static void emit_context_line(const char *reset,
543 struct emit_callback *ecbdata,
544 const char *line, int len)
545{
546 emit_line_checked(reset, ecbdata, line, len,
547 DIFF_CONTEXT, WSEH_CONTEXT, ' ');
548}
549static void emit_hunk_header(struct emit_callback *ecbdata,
551 const char *line, int len)
552{
553 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
554 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
555 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
556 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
557 static const char atat[2] = { '@', '@' };
558 const char *cp, *ep;
559 struct strbuf msgbuf = STRBUF_INIT;
560 int org_len = len;
561 int i = 1;
562 /*
564 * As a hunk header must begin with "@@ -<old>, +<new> @@",
565 * it always is at least 10 bytes long.
566 */
567 if (len < 10 ||
568 memcmp(line, atat, 2) ||
569 !(ep = memmem(line + 2, len - 2, atat, 2))) {
570 emit_line(ecbdata->opt, context, reset, line, len);
571 return;
572 }
573 ep += 2; /* skip over @@ */
574 /* The hunk header in fraginfo color */
576 strbuf_addstr(&msgbuf, frag);
577 strbuf_add(&msgbuf, line, ep - line);
578 strbuf_addstr(&msgbuf, reset);
579 /*
581 * trailing "\r\n"
582 */
583 for ( ; i < 3; i++)
584 if (line[len - i] == '\r' || line[len - i] == '\n')
585 len--;
586 /* blank before the func header */
588 for (cp = ep; ep - line < len; ep++)
589 if (*ep != ' ' && *ep != '\t')
590 break;
591 if (ep != cp) {
592 strbuf_addstr(&msgbuf, context);
593 strbuf_add(&msgbuf, cp, ep - cp);
594 strbuf_addstr(&msgbuf, reset);
595 }
596 if (ep < line + len) {
598 strbuf_addstr(&msgbuf, func);
599 strbuf_add(&msgbuf, ep, line + len - ep);
600 strbuf_addstr(&msgbuf, reset);
601 }
602 strbuf_add(&msgbuf, line + len, org_len - len);
604 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
605 strbuf_release(&msgbuf);
606}
607static struct diff_tempfile *claim_diff_tempfile(void) {
609 int i;
610 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
611 if (!diff_temp[i].name)
612 return diff_temp + i;
613 die("BUG: diff is failing to clean up its tempfiles");
614}
615static void remove_tempfile(void)
617{
618 int i;
619 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
620 if (is_tempfile_active(&diff_temp[i].tempfile))
621 delete_tempfile(&diff_temp[i].tempfile);
622 diff_temp[i].name = NULL;
623 }
624}
625static void print_line_count(FILE *file, int count)
627{
628 switch (count) {
629 case 0:
630 fprintf(file, "0,0");
631 break;
632 case 1:
633 fprintf(file, "1");
634 break;
635 default:
636 fprintf(file, "1,%d", count);
637 break;
638 }
639}
640static void emit_rewrite_lines(struct emit_callback *ecb,
642 int prefix, const char *data, int size)
643{
644 const char *endp = NULL;
645 static const char *nneof = " No newline at end of file\n";
646 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
647 while (0 < size) {
649 int len;
650 endp = memchr(data, '\n', size);
652 len = endp ? (endp - data + 1) : size;
653 if (prefix != '+') {
654 ecb->lno_in_preimage++;
655 emit_del_line(reset, ecb, data, len);
656 } else {
657 ecb->lno_in_postimage++;
658 emit_add_line(reset, ecb, data, len);
659 }
660 size -= len;
661 data += len;
662 }
663 if (!endp) {
664 const char *context = diff_get_color(ecb->color_diff,
665 DIFF_CONTEXT);
666 putc('\n', ecb->opt->file);
667 emit_line_0(ecb->opt, context, reset, '\\',
668 nneof, strlen(nneof));
669 }
670}
671static void emit_rewrite_diff(const char *name_a,
673 const char *name_b,
674 struct diff_filespec *one,
675 struct diff_filespec *two,
676 struct userdiff_driver *textconv_one,
677 struct userdiff_driver *textconv_two,
678 struct diff_options *o)
679{
680 int lc_a, lc_b;
681 const char *name_a_tab, *name_b_tab;
682 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
683 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
684 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
685 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
686 const char *a_prefix, *b_prefix;
687 char *data_one, *data_two;
688 size_t size_one, size_two;
689 struct emit_callback ecbdata;
690 const char *line_prefix = diff_line_prefix(o);
691 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
693 a_prefix = o->b_prefix;
694 b_prefix = o->a_prefix;
695 } else {
696 a_prefix = o->a_prefix;
697 b_prefix = o->b_prefix;
698 }
699 name_a += (*name_a == '/');
701 name_b += (*name_b == '/');
702 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
703 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
704 strbuf_reset(&a_name);
706 strbuf_reset(&b_name);
707 quote_two_c_style(&a_name, a_prefix, name_a, 0);
708 quote_two_c_style(&b_name, b_prefix, name_b, 0);
709 size_one = fill_textconv(textconv_one, one, &data_one);
711 size_two = fill_textconv(textconv_two, two, &data_two);
712 memset(&ecbdata, 0, sizeof(ecbdata));
714 ecbdata.color_diff = want_color(o->use_color);
715 ecbdata.found_changesp = &o->found_changes;
716 ecbdata.ws_rule = whitespace_rule(name_b);
717 ecbdata.opt = o;
718 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
719 mmfile_t mf1, mf2;
720 mf1.ptr = (char *)data_one;
721 mf2.ptr = (char *)data_two;
722 mf1.size = size_one;
723 mf2.size = size_two;
724 check_blank_at_eof(&mf1, &mf2, &ecbdata);
725 }
726 ecbdata.lno_in_preimage = 1;
727 ecbdata.lno_in_postimage = 1;
728 lc_a = count_lines(data_one, size_one);
730 lc_b = count_lines(data_two, size_two);
731 fprintf(o->file,
732 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
733 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
734 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
735 line_prefix, fraginfo);
736 if (!o->irreversible_delete)
737 print_line_count(o->file, lc_a);
738 else
739 fprintf(o->file, "?,?");
740 fprintf(o->file, " +");
741 print_line_count(o->file, lc_b);
742 fprintf(o->file, " @@%s\n", reset);
743 if (lc_a && !o->irreversible_delete)
744 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
745 if (lc_b)
746 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
747 if (textconv_one)
748 free((char *)data_one);
749 if (textconv_two)
750 free((char *)data_two);
751}
752struct diff_words_buffer {
754 mmfile_t text;
755 long alloc;
756 struct diff_words_orig {
757 const char *begin, *end;
758 } *orig;
759 int orig_nr, orig_alloc;
760};
761static void diff_words_append(char *line, unsigned long len,
763 struct diff_words_buffer *buffer)
764{
765 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
766 line++;
767 len--;
768 memcpy(buffer->text.ptr + buffer->text.size, line, len);
769 buffer->text.size += len;
770 buffer->text.ptr[buffer->text.size] = '\0';
771}
772struct diff_words_style_elem {
774 const char *prefix;
775 const char *suffix;
776 const char *color; /* NULL; filled in by the setup code if
777 * color is enabled */
778};
779struct diff_words_style {
781 enum diff_words_type type;
782 struct diff_words_style_elem new, old, ctx;
783 const char *newline;
784};
785static struct diff_words_style diff_words_styles[] = {
787 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
788 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
789 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
790};
791struct diff_words_data {
793 struct diff_words_buffer minus, plus;
794 const char *current_plus;
795 int last_minus;
796 struct diff_options *opt;
797 regex_t *word_regex;
798 enum diff_words_type type;
799 struct diff_words_style *style;
800};
801static int fn_out_diff_words_write_helper(FILE *fp,
803 struct diff_words_style_elem *st_el,
804 const char *newline,
805 size_t count, const char *buf,
806 const char *line_prefix)
807{
808 int print = 0;
809 while (count) {
811 char *p = memchr(buf, '\n', count);
812 if (print)
813 fputs(line_prefix, fp);
814 if (p != buf) {
815 if (st_el->color && fputs(st_el->color, fp) < 0)
816 return -1;
817 if (fputs(st_el->prefix, fp) < 0 ||
818 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
819 fputs(st_el->suffix, fp) < 0)
820 return -1;
821 if (st_el->color && *st_el->color
822 && fputs(GIT_COLOR_RESET, fp) < 0)
823 return -1;
824 }
825 if (!p)
826 return 0;
827 if (fputs(newline, fp) < 0)
828 return -1;
829 count -= p + 1 - buf;
830 buf = p + 1;
831 print = 1;
832 }
833 return 0;
834}
835/*
837 * '--color-words' algorithm can be described as:
838 *
839 * 1. collect a the minus/plus lines of a diff hunk, divided into
840 * minus-lines and plus-lines;
841 *
842 * 2. break both minus-lines and plus-lines into words and
843 * place them into two mmfile_t with one word for each line;
844 *
845 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
846 *
847 * And for the common parts of the both file, we output the plus side text.
848 * diff_words->current_plus is used to trace the current position of the plus file
849 * which printed. diff_words->last_minus is used to trace the last minus word
850 * printed.
851 *
852 * For '--graph' to work with '--color-words', we need to output the graph prefix
853 * on each line of color words output. Generally, there are two conditions on
854 * which we should output the prefix.
855 *
856 * 1. diff_words->last_minus == 0 &&
857 * diff_words->current_plus == diff_words->plus.text.ptr
858 *
859 * that is: the plus text must start as a new line, and if there is no minus
860 * word printed, a graph prefix must be printed.
861 *
862 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
863 * *(diff_words->current_plus - 1) == '\n'
864 *
865 * that is: a graph prefix must be printed following a '\n'
866 */
867static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
868{
869 if ((diff_words->last_minus == 0 &&
870 diff_words->current_plus == diff_words->plus.text.ptr) ||
871 (diff_words->current_plus > diff_words->plus.text.ptr &&
872 *(diff_words->current_plus - 1) == '\n')) {
873 return 1;
874 } else {
875 return 0;
876 }
877}
878static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
880{
881 struct diff_words_data *diff_words = priv;
882 struct diff_words_style *style = diff_words->style;
883 int minus_first, minus_len, plus_first, plus_len;
884 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
885 struct diff_options *opt = diff_words->opt;
886 const char *line_prefix;
887 if (line[0] != '@' || parse_hunk_header(line, len,
889 &minus_first, &minus_len, &plus_first, &plus_len))
890 return;
891 assert(opt);
893 line_prefix = diff_line_prefix(opt);
894 /* POSIX requires that first be decremented by one if len == 0... */
896 if (minus_len) {
897 minus_begin = diff_words->minus.orig[minus_first].begin;
898 minus_end =
899 diff_words->minus.orig[minus_first + minus_len - 1].end;
900 } else
901 minus_begin = minus_end =
902 diff_words->minus.orig[minus_first].end;
903 if (plus_len) {
905 plus_begin = diff_words->plus.orig[plus_first].begin;
906 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
907 } else
908 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
909 if (color_words_output_graph_prefix(diff_words)) {
911 fputs(line_prefix, diff_words->opt->file);
912 }
913 if (diff_words->current_plus != plus_begin) {
914 fn_out_diff_words_write_helper(diff_words->opt->file,
915 &style->ctx, style->newline,
916 plus_begin - diff_words->current_plus,
917 diff_words->current_plus, line_prefix);
918 if (*(plus_begin - 1) == '\n')
919 fputs(line_prefix, diff_words->opt->file);
920 }
921 if (minus_begin != minus_end) {
922 fn_out_diff_words_write_helper(diff_words->opt->file,
923 &style->old, style->newline,
924 minus_end - minus_begin, minus_begin,
925 line_prefix);
926 }
927 if (plus_begin != plus_end) {
928 fn_out_diff_words_write_helper(diff_words->opt->file,
929 &style->new, style->newline,
930 plus_end - plus_begin, plus_begin,
931 line_prefix);
932 }
933 diff_words->current_plus = plus_end;
935 diff_words->last_minus = minus_first;
936}
937/* This function starts looking at *begin, and returns 0 iff a word was found. */
939static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
940 int *begin, int *end)
941{
942 if (word_regex && *begin < buffer->size) {
943 regmatch_t match[1];
944 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
945 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
946 '\n', match[0].rm_eo - match[0].rm_so);
947 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
948 *begin += match[0].rm_so;
949 return *begin >= *end;
950 }
951 return -1;
952 }
953 /* find the next word */
955 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
956 (*begin)++;
957 if (*begin >= buffer->size)
958 return -1;
959 /* find the end of the word */
961 *end = *begin + 1;
962 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
963 (*end)++;
964 return 0;
966}
967/*
969 * This function splits the words in buffer->text, stores the list with
970 * newline separator into out, and saves the offsets of the original words
971 * in buffer->orig.
972 */
973static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
974 regex_t *word_regex)
975{
976 int i, j;
977 long alloc = 0;
978 out->size = 0;
980 out->ptr = NULL;
981 /* fake an empty "0th" word */
983 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
984 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
985 buffer->orig_nr = 1;
986 for (i = 0; i < buffer->text.size; i++) {
988 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
989 return;
990 /* store original boundaries */
992 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
993 buffer->orig_alloc);
994 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
995 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
996 buffer->orig_nr++;
997 /* store one word */
999 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
1000 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
1001 out->ptr[out->size + j - i] = '\n';
1002 out->size += j - i + 1;
1003 i = j - 1;
1005 }
1006}
1007/* this executes the word diff on the accumulated buffers */
1009static void diff_words_show(struct diff_words_data *diff_words)
1010{
1011 xpparam_t xpp;
1012 xdemitconf_t xecfg;
1013 mmfile_t minus, plus;
1014 struct diff_words_style *style = diff_words->style;
1015 struct diff_options *opt = diff_words->opt;
1017 const char *line_prefix;
1018 assert(opt);
1020 line_prefix = diff_line_prefix(opt);
1021 /* special case: only removal */
1023 if (!diff_words->plus.text.size) {
1024 fputs(line_prefix, diff_words->opt->file);
1025 fn_out_diff_words_write_helper(diff_words->opt->file,
1026 &style->old, style->newline,
1027 diff_words->minus.text.size,
1028 diff_words->minus.text.ptr, line_prefix);
1029 diff_words->minus.text.size = 0;
1030 return;
1031 }
1032 diff_words->current_plus = diff_words->plus.text.ptr;
1034 diff_words->last_minus = 0;
1035 memset(&xpp, 0, sizeof(xpp));
1037 memset(&xecfg, 0, sizeof(xecfg));
1038 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1039 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1040 xpp.flags = 0;
1041 /* as only the hunk header will be parsed, we need a 0-context */
1042 xecfg.ctxlen = 0;
1043 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1044 &xpp, &xecfg))
1045 die("unable to generate word diff");
1046 free(minus.ptr);
1047 free(plus.ptr);
1048 if (diff_words->current_plus != diff_words->plus.text.ptr +
1049 diff_words->plus.text.size) {
1050 if (color_words_output_graph_prefix(diff_words))
1051 fputs(line_prefix, diff_words->opt->file);
1052 fn_out_diff_words_write_helper(diff_words->opt->file,
1053 &style->ctx, style->newline,
1054 diff_words->plus.text.ptr + diff_words->plus.text.size
1055 - diff_words->current_plus, diff_words->current_plus,
1056 line_prefix);
1057 }
1058 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1059}
1060/* In "color-words" mode, show word-diff of words accumulated in the buffer */
1062static void diff_words_flush(struct emit_callback *ecbdata)
1063{
1064 if (ecbdata->diff_words->minus.text.size ||
1065 ecbdata->diff_words->plus.text.size)
1066 diff_words_show(ecbdata->diff_words);
1067}
1068static void diff_filespec_load_driver(struct diff_filespec *one)
1070{
1071 /* Use already-loaded driver */
1072 if (one->driver)
1073 return;
1074 if (S_ISREG(one->mode))
1076 one->driver = userdiff_find_by_path(one->path);
1077 /* Fallback to default settings */
1079 if (!one->driver)
1080 one->driver = userdiff_find_by_name("default");
1081}
1082static const char *userdiff_word_regex(struct diff_filespec *one)
1084{
1085 diff_filespec_load_driver(one);
1086 return one->driver->word_regex;
1087}
1088static void init_diff_words_data(struct emit_callback *ecbdata,
1090 struct diff_options *orig_opts,
1091 struct diff_filespec *one,
1092 struct diff_filespec *two)
1093{
1094 int i;
1095 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1096 memcpy(o, orig_opts, sizeof(struct diff_options));
1097 ecbdata->diff_words =
1099 xcalloc(1, sizeof(struct diff_words_data));
1100 ecbdata->diff_words->type = o->word_diff;
1101 ecbdata->diff_words->opt = o;
1102 if (!o->word_regex)
1103 o->word_regex = userdiff_word_regex(one);
1104 if (!o->word_regex)
1105 o->word_regex = userdiff_word_regex(two);
1106 if (!o->word_regex)
1107 o->word_regex = diff_word_regex_cfg;
1108 if (o->word_regex) {
1109 ecbdata->diff_words->word_regex = (regex_t *)
1110 xmalloc(sizeof(regex_t));
1111 if (regcomp(ecbdata->diff_words->word_regex,
1112 o->word_regex,
1113 REG_EXTENDED | REG_NEWLINE))
1114 die ("Invalid regular expression: %s",
1115 o->word_regex);
1116 }
1117 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1118 if (o->word_diff == diff_words_styles[i].type) {
1119 ecbdata->diff_words->style =
1120 &diff_words_styles[i];
1121 break;
1122 }
1123 }
1124 if (want_color(o->use_color)) {
1125 struct diff_words_style *st = ecbdata->diff_words->style;
1126 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1127 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1128 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1129 }
1130}
1131static void free_diff_words_data(struct emit_callback *ecbdata)
1133{
1134 if (ecbdata->diff_words) {
1135 diff_words_flush(ecbdata);
1136 free (ecbdata->diff_words->opt);
1137 free (ecbdata->diff_words->minus.text.ptr);
1138 free (ecbdata->diff_words->minus.orig);
1139 free (ecbdata->diff_words->plus.text.ptr);
1140 free (ecbdata->diff_words->plus.orig);
1141 if (ecbdata->diff_words->word_regex) {
1142 regfree(ecbdata->diff_words->word_regex);
1143 free(ecbdata->diff_words->word_regex);
1144 }
1145 free(ecbdata->diff_words);
1146 ecbdata->diff_words = NULL;
1147 }
1148}
1149const char *diff_get_color(int diff_use_color, enum color_diff ix)
1151{
1152 if (want_color(diff_use_color))
1153 return diff_colors[ix];
1154 return "";
1155}
1156const char *diff_line_prefix(struct diff_options *opt)
1158{
1159 struct strbuf *msgbuf;
1160 if (!opt->output_prefix)
1161 return "";
1162 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1164 return msgbuf->buf;
1165}
1166static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1168{
1169 const char *cp;
1170 unsigned long allot;
1171 size_t l = len;
1172 if (ecb->truncate)
1174 return ecb->truncate(line, len);
1175 cp = line;
1176 allot = l;
1177 while (0 < l) {
1178 (void) utf8_width(&cp, &l);
1179 if (!cp)
1180 break; /* truncated in the middle? */
1181 }
1182 return allot - l;
1183}
1184static void find_lno(const char *line, struct emit_callback *ecbdata)
1186{
1187 const char *p;
1188 ecbdata->lno_in_preimage = 0;
1189 ecbdata->lno_in_postimage = 0;
1190 p = strchr(line, '-');
1191 if (!p)
1192 return; /* cannot happen */
1193 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1194 p = strchr(p, '+');
1195 if (!p)
1196 return; /* cannot happen */
1197 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1198}
1199static void fn_out_consume(void *priv, char *line, unsigned long len)
1201{
1202 struct emit_callback *ecbdata = priv;
1203 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1204 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1205 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1206 struct diff_options *o = ecbdata->opt;
1207 const char *line_prefix = diff_line_prefix(o);
1208 if (ecbdata->header) {
1210 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1211 strbuf_reset(ecbdata->header);
1212 ecbdata->header = NULL;
1213 }
1214 *(ecbdata->found_changesp) = 1;
1215 if (ecbdata->label_path[0]) {
1217 const char *name_a_tab, *name_b_tab;
1218 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1220 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1221 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1223 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1224 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1225 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1226 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1227 }
1228 if (diff_suppress_blank_empty
1230 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1231 line[0] = '\n';
1232 len = 1;
1233 }
1234 if (line[0] == '@') {
1236 if (ecbdata->diff_words)
1237 diff_words_flush(ecbdata);
1238 len = sane_truncate_line(ecbdata, line, len);
1239 find_lno(line, ecbdata);
1240 emit_hunk_header(ecbdata, line, len);
1241 if (line[len-1] != '\n')
1242 putc('\n', ecbdata->opt->file);
1243 return;
1244 }
1245 if (len < 1) {
1247 emit_line(ecbdata->opt, reset, reset, line, len);
1248 if (ecbdata->diff_words
1249 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1250 fputs("~\n", ecbdata->opt->file);
1251 return;
1252 }
1253 if (ecbdata->diff_words) {
1255 if (line[0] == '-') {
1256 diff_words_append(line, len,
1257 &ecbdata->diff_words->minus);
1258 return;
1259 } else if (line[0] == '+') {
1260 diff_words_append(line, len,
1261 &ecbdata->diff_words->plus);
1262 return;
1263 } else if (starts_with(line, "\\ ")) {
1264 /*
1265 * Eat the "no newline at eof" marker as if we
1266 * saw a "+" or "-" line with nothing on it,
1267 * and return without diff_words_flush() to
1268 * defer processing. If this is the end of
1269 * preimage, more "+" lines may come after it.
1270 */
1271 return;
1272 }
1273 diff_words_flush(ecbdata);
1274 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1275 emit_line(ecbdata->opt, context, reset, line, len);
1276 fputs("~\n", ecbdata->opt->file);
1277 } else {
1278 /*
1279 * Skip the prefix character, if any. With
1280 * diff_suppress_blank_empty, there may be
1281 * none.
1282 */
1283 if (line[0] != '\n') {
1284 line++;
1285 len--;
1286 }
1287 emit_line(ecbdata->opt, context, reset, line, len);
1288 }
1289 return;
1290 }
1291 switch (line[0]) {
1293 case '+':
1294 ecbdata->lno_in_postimage++;
1295 emit_add_line(reset, ecbdata, line + 1, len - 1);
1296 break;
1297 case '-':
1298 ecbdata->lno_in_preimage++;
1299 emit_del_line(reset, ecbdata, line + 1, len - 1);
1300 break;
1301 case ' ':
1302 ecbdata->lno_in_postimage++;
1303 ecbdata->lno_in_preimage++;
1304 emit_context_line(reset, ecbdata, line + 1, len - 1);
1305 break;
1306 default:
1307 /* incomplete line at the end */
1308 ecbdata->lno_in_preimage++;
1309 emit_line(ecbdata->opt,
1310 diff_get_color(ecbdata->color_diff, DIFF_CONTEXT),
1311 reset, line, len);
1312 break;
1313 }
1314}
1315static char *pprint_rename(const char *a, const char *b)
1317{
1318 const char *old = a;
1319 const char *new = b;
1320 struct strbuf name = STRBUF_INIT;
1321 int pfx_length, sfx_length;
1322 int pfx_adjust_for_slash;
1323 int len_a = strlen(a);
1324 int len_b = strlen(b);
1325 int a_midlen, b_midlen;
1326 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1327 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1328 if (qlen_a || qlen_b) {
1330 quote_c_style(a, &name, NULL, 0);
1331 strbuf_addstr(&name, " => ");
1332 quote_c_style(b, &name, NULL, 0);
1333 return strbuf_detach(&name, NULL);
1334 }
1335 /* Find common prefix */
1337 pfx_length = 0;
1338 while (*old && *new && *old == *new) {
1339 if (*old == '/')
1340 pfx_length = old - a + 1;
1341 old++;
1342 new++;
1343 }
1344 /* Find common suffix */
1346 old = a + len_a;
1347 new = b + len_b;
1348 sfx_length = 0;
1349 /*
1350 * If there is a common prefix, it must end in a slash. In
1351 * that case we let this loop run 1 into the prefix to see the
1352 * same slash.
1353 *
1354 * If there is no common prefix, we cannot do this as it would
1355 * underrun the input strings.
1356 */
1357 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1358 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1359 b + pfx_length - pfx_adjust_for_slash <= new &&
1360 *old == *new) {
1361 if (*old == '/')
1362 sfx_length = len_a - (old - a);
1363 old--;
1364 new--;
1365 }
1366 /*
1368 * pfx{mid-a => mid-b}sfx
1369 * {pfx-a => pfx-b}sfx
1370 * pfx{sfx-a => sfx-b}
1371 * name-a => name-b
1372 */
1373 a_midlen = len_a - pfx_length - sfx_length;
1374 b_midlen = len_b - pfx_length - sfx_length;
1375 if (a_midlen < 0)
1376 a_midlen = 0;
1377 if (b_midlen < 0)
1378 b_midlen = 0;
1379 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1381 if (pfx_length + sfx_length) {
1382 strbuf_add(&name, a, pfx_length);
1383 strbuf_addch(&name, '{');
1384 }
1385 strbuf_add(&name, a + pfx_length, a_midlen);
1386 strbuf_addstr(&name, " => ");
1387 strbuf_add(&name, b + pfx_length, b_midlen);
1388 if (pfx_length + sfx_length) {
1389 strbuf_addch(&name, '}');
1390 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1391 }
1392 return strbuf_detach(&name, NULL);
1393}
1394struct diffstat_t {
1396 int nr;
1397 int alloc;
1398 struct diffstat_file {
1399 char *from_name;
1400 char *name;
1401 char *print_name;
1402 unsigned is_unmerged:1;
1403 unsigned is_binary:1;
1404 unsigned is_renamed:1;
1405 unsigned is_interesting:1;
1406 uintmax_t added, deleted;
1407 } **files;
1408};
1409static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1411 const char *name_a,
1412 const char *name_b)
1413{
1414 struct diffstat_file *x;
1415 x = xcalloc(1, sizeof(*x));
1416 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1417 diffstat->files[diffstat->nr++] = x;
1418 if (name_b) {
1419 x->from_name = xstrdup(name_a);
1420 x->name = xstrdup(name_b);
1421 x->is_renamed = 1;
1422 }
1423 else {
1424 x->from_name = NULL;
1425 x->name = xstrdup(name_a);
1426 }
1427 return x;
1428}
1429static void diffstat_consume(void *priv, char *line, unsigned long len)
1431{
1432 struct diffstat_t *diffstat = priv;
1433 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1434 if (line[0] == '+')
1436 x->added++;
1437 else if (line[0] == '-')
1438 x->deleted++;
1439}
1440const char mime_boundary_leader[] = "------------";
1442static int scale_linear(int it, int width, int max_change)
1444{
1445 if (!it)
1446 return 0;
1447 /*
1448 * make sure that at least one '-' or '+' is printed if
1449 * there is any change to this path. The easiest way is to
1450 * scale linearly as if the alloted width is one column shorter
1451 * than it is, and then add 1 to the result.
1452 */
1453 return 1 + (it * (width - 1) / max_change);
1454}
1455static void show_name(FILE *file,
1457 const char *prefix, const char *name, int len)
1458{
1459 fprintf(file, " %s%-*s |", prefix, len, name);
1460}
1461static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1463{
1464 if (cnt <= 0)
1465 return;
1466 fprintf(file, "%s", set);
1467 while (cnt--)
1468 putc(ch, file);
1469 fprintf(file, "%s", reset);
1470}
1471static void fill_print_name(struct diffstat_file *file)
1473{
1474 char *pname;
1475 if (file->print_name)
1477 return;
1478 if (!file->is_renamed) {
1480 struct strbuf buf = STRBUF_INIT;
1481 if (quote_c_style(file->name, &buf, NULL, 0)) {
1482 pname = strbuf_detach(&buf, NULL);
1483 } else {
1484 pname = file->name;
1485 strbuf_release(&buf);
1486 }
1487 } else {
1488 pname = pprint_rename(file->from_name, file->name);
1489 }
1490 file->print_name = pname;
1491}
1492int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1494{
1495 struct strbuf sb = STRBUF_INIT;
1496 int ret;
1497 if (!files) {
1499 assert(insertions == 0 && deletions == 0);
1500 return fprintf(fp, "%s\n", " 0 files changed");
1501 }
1502 strbuf_addf(&sb,
1504 (files == 1) ? " %d file changed" : " %d files changed",
1505 files);
1506 /*
1508 * For binary diff, the caller may want to print "x files
1509 * changed" with insertions == 0 && deletions == 0.
1510 *
1511 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1512 * is probably less confusing (i.e skip over "2 files changed
1513 * but nothing about added/removed lines? Is this a bug in Git?").
1514 */
1515 if (insertions || deletions == 0) {
1516 strbuf_addf(&sb,
1517 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1518 insertions);
1519 }
1520 if (deletions || insertions == 0) {
1522 strbuf_addf(&sb,
1523 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1524 deletions);
1525 }
1526 strbuf_addch(&sb, '\n');
1527 ret = fputs(sb.buf, fp);
1528 strbuf_release(&sb);
1529 return ret;
1530}
1531static void show_stats(struct diffstat_t *data, struct diff_options *options)
1533{
1534 int i, len, add, del, adds = 0, dels = 0;
1535 uintmax_t max_change = 0, max_len = 0;
1536 int total_files = data->nr, count;
1537 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1538 const char *reset, *add_c, *del_c;
1539 const char *line_prefix = "";
1540 int extra_shown = 0;
1541 if (data->nr == 0)
1543 return;
1544 line_prefix = diff_line_prefix(options);
1546 count = options->stat_count ? options->stat_count : data->nr;
1547 reset = diff_get_color_opt(options, DIFF_RESET);
1549 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1550 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1551 /*
1553 * Find the longest filename and max number of changes
1554 */
1555 for (i = 0; (i < count) && (i < data->nr); i++) {
1556 struct diffstat_file *file = data->files[i];
1557 uintmax_t change = file->added + file->deleted;
1558 if (!file->is_interesting && (change == 0)) {
1560 count++; /* not shown == room for one more */
1561 continue;
1562 }
1563 fill_print_name(file);
1564 len = strlen(file->print_name);
1565 if (max_len < len)
1566 max_len = len;
1567 if (file->is_unmerged) {
1569 /* "Unmerged" is 8 characters */
1570 bin_width = bin_width < 8 ? 8 : bin_width;
1571 continue;
1572 }
1573 if (file->is_binary) {
1574 /* "Bin XXX -> YYY bytes" */
1575 int w = 14 + decimal_width(file->added)
1576 + decimal_width(file->deleted);
1577 bin_width = bin_width < w ? w : bin_width;
1578 /* Display change counts aligned with "Bin" */
1579 number_width = 3;
1580 continue;
1581 }
1582 if (max_change < change)
1584 max_change = change;
1585 }
1586 count = i; /* where we can stop scanning in data->files[] */
1587 /*
1589 * We have width = stat_width or term_columns() columns total.
1590 * We want a maximum of min(max_len, stat_name_width) for the name part.
1591 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1592 * We also need 1 for " " and 4 + decimal_width(max_change)
1593 * for " | NNNN " and one the empty column at the end, altogether
1594 * 6 + decimal_width(max_change).
1595 *
1596 * If there's not enough space, we will use the smaller of
1597 * stat_name_width (if set) and 5/8*width for the filename,
1598 * and the rest for constant elements + graph part, but no more
1599 * than stat_graph_width for the graph part.
1600 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1601 * for the standard terminal size).
1602 *
1603 * In other words: stat_width limits the maximum width, and
1604 * stat_name_width fixes the maximum width of the filename,
1605 * and is also used to divide available columns if there
1606 * aren't enough.
1607 *
1608 * Binary files are displayed with "Bin XXX -> YYY bytes"
1609 * instead of the change count and graph. This part is treated
1610 * similarly to the graph part, except that it is not
1611 * "scaled". If total width is too small to accommodate the
1612 * guaranteed minimum width of the filename part and the
1613 * separators and this message, this message will "overflow"
1614 * making the line longer than the maximum width.
1615 */
1616 if (options->stat_width == -1)
1618 width = term_columns() - options->output_prefix_length;
1619 else
1620 width = options->stat_width ? options->stat_width : 80;
1621 number_width = decimal_width(max_change) > number_width ?
1622 decimal_width(max_change) : number_width;
1623 if (options->stat_graph_width == -1)
1625 options->stat_graph_width = diff_stat_graph_width;
1626 /*
1628 * Guarantee 3/8*16==6 for the graph part
1629 * and 5/8*16==10 for the filename part
1630 */
1631 if (width < 16 + 6 + number_width)
1632 width = 16 + 6 + number_width;
1633 /*
1635 * First assign sizes that are wanted, ignoring available width.
1636 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1637 * starting from "XXX" should fit in graph_width.
1638 */
1639 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1640 if (options->stat_graph_width &&
1641 options->stat_graph_width < graph_width)
1642 graph_width = options->stat_graph_width;
1643 name_width = (options->stat_name_width > 0 &&
1645 options->stat_name_width < max_len) ?
1646 options->stat_name_width : max_len;
1647 /*
1649 * Adjust adjustable widths not to exceed maximum width
1650 */
1651 if (name_width + number_width + 6 + graph_width > width) {
1652 if (graph_width > width * 3/8 - number_width - 6) {
1653 graph_width = width * 3/8 - number_width - 6;
1654 if (graph_width < 6)
1655 graph_width = 6;
1656 }
1657 if (options->stat_graph_width &&
1659 graph_width > options->stat_graph_width)
1660 graph_width = options->stat_graph_width;
1661 if (name_width > width - number_width - 6 - graph_width)
1662 name_width = width - number_width - 6 - graph_width;
1663 else
1664 graph_width = width - number_width - 6 - name_width;
1665 }
1666 /*
1668 * From here name_width is the width of the name area,
1669 * and graph_width is the width of the graph area.
1670 * max_change is used to scale graph properly.
1671 */
1672 for (i = 0; i < count; i++) {
1673 const char *prefix = "";
1674 struct diffstat_file *file = data->files[i];
1675 char *name = file->print_name;
1676 uintmax_t added = file->added;
1677 uintmax_t deleted = file->deleted;
1678 int name_len;
1679 if (!file->is_interesting && (added + deleted == 0))
1681 continue;
1682 /*
1684 * "scale" the filename
1685 */
1686 len = name_width;
1687 name_len = strlen(name);
1688 if (name_width < name_len) {
1689 char *slash;
1690 prefix = "...";
1691 len -= 3;
1692 name += name_len - len;
1693 slash = strchr(name, '/');
1694 if (slash)
1695 name = slash;
1696 }
1697 if (file->is_binary) {
1699 fprintf(options->file, "%s", line_prefix);
1700 show_name(options->file, prefix, name, len);
1701 fprintf(options->file, " %*s", number_width, "Bin");
1702 if (!added && !deleted) {
1703 putc('\n', options->file);
1704 continue;
1705 }
1706 fprintf(options->file, " %s%"PRIuMAX"%s",
1707 del_c, deleted, reset);
1708 fprintf(options->file, " -> ");
1709 fprintf(options->file, "%s%"PRIuMAX"%s",
1710 add_c, added, reset);
1711 fprintf(options->file, " bytes");
1712 fprintf(options->file, "\n");
1713 continue;
1714 }
1715 else if (file->is_unmerged) {
1716 fprintf(options->file, "%s", line_prefix);
1717 show_name(options->file, prefix, name, len);
1718 fprintf(options->file, " Unmerged\n");
1719 continue;
1720 }
1721 /*
1723 * scale the add/delete
1724 */
1725 add = added;
1726 del = deleted;
1727 if (graph_width <= max_change) {
1729 int total = scale_linear(add + del, graph_width, max_change);
1730 if (total < 2 && add && del)
1731 /* width >= 2 due to the sanity check */
1732 total = 2;
1733 if (add < del) {
1734 add = scale_linear(add, graph_width, max_change);
1735 del = total - add;
1736 } else {
1737 del = scale_linear(del, graph_width, max_change);
1738 add = total - del;
1739 }
1740 }
1741 fprintf(options->file, "%s", line_prefix);
1742 show_name(options->file, prefix, name, len);
1743 fprintf(options->file, " %*"PRIuMAX"%s",
1744 number_width, added + deleted,
1745 added + deleted ? " " : "");
1746 show_graph(options->file, '+', add, add_c, reset);
1747 show_graph(options->file, '-', del, del_c, reset);
1748 fprintf(options->file, "\n");
1749 }
1750 for (i = 0; i < data->nr; i++) {
1752 struct diffstat_file *file = data->files[i];
1753 uintmax_t added = file->added;
1754 uintmax_t deleted = file->deleted;
1755 if (file->is_unmerged ||
1757 (!file->is_interesting && (added + deleted == 0))) {
1758 total_files--;
1759 continue;
1760 }
1761 if (!file->is_binary) {
1763 adds += added;
1764 dels += deleted;
1765 }
1766 if (i < count)
1767 continue;
1768 if (!extra_shown)
1769 fprintf(options->file, "%s ...\n", line_prefix);
1770 extra_shown = 1;
1771 }
1772 fprintf(options->file, "%s", line_prefix);
1773 print_stat_summary(options->file, total_files, adds, dels);
1774}
1775static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1777{
1778 int i, adds = 0, dels = 0, total_files = data->nr;
1779 if (data->nr == 0)
1781 return;
1782 for (i = 0; i < data->nr; i++) {
1784 int added = data->files[i]->added;
1785 int deleted= data->files[i]->deleted;
1786 if (data->files[i]->is_unmerged ||
1788 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1789 total_files--;
1790 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1791 adds += added;
1792 dels += deleted;
1793 }
1794 }
1795 fprintf(options->file, "%s", diff_line_prefix(options));
1796 print_stat_summary(options->file, total_files, adds, dels);
1797}
1798static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1800{
1801 int i;
1802 if (data->nr == 0)
1804 return;
1805 for (i = 0; i < data->nr; i++) {
1807 struct diffstat_file *file = data->files[i];
1808 fprintf(options->file, "%s", diff_line_prefix(options));
1810 if (file->is_binary)
1812 fprintf(options->file, "-\t-\t");
1813 else
1814 fprintf(options->file,
1815 "%"PRIuMAX"\t%"PRIuMAX"\t",
1816 file->added, file->deleted);
1817 if (options->line_termination) {
1818 fill_print_name(file);
1819 if (!file->is_renamed)
1820 write_name_quoted(file->name, options->file,
1821 options->line_termination);
1822 else {
1823 fputs(file->print_name, options->file);
1824 putc(options->line_termination, options->file);
1825 }
1826 } else {
1827 if (file->is_renamed) {
1828 putc('\0', options->file);
1829 write_name_quoted(file->from_name, options->file, '\0');
1830 }
1831 write_name_quoted(file->name, options->file, '\0');
1832 }
1833 }
1834}
1835struct dirstat_file {
1837 const char *name;
1838 unsigned long changed;
1839};
1840struct dirstat_dir {
1842 struct dirstat_file *files;
1843 int alloc, nr, permille, cumulative;
1844};
1845static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1847 unsigned long changed, const char *base, int baselen)
1848{
1849 unsigned long this_dir = 0;
1850 unsigned int sources = 0;
1851 const char *line_prefix = diff_line_prefix(opt);
1852 while (dir->nr) {
1854 struct dirstat_file *f = dir->files;
1855 int namelen = strlen(f->name);
1856 unsigned long this;
1857 char *slash;
1858 if (namelen < baselen)
1860 break;
1861 if (memcmp(f->name, base, baselen))
1862 break;
1863 slash = strchr(f->name + baselen, '/');
1864 if (slash) {
1865 int newbaselen = slash + 1 - f->name;
1866 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1867 sources++;
1868 } else {
1869 this = f->changed;
1870 dir->files++;
1871 dir->nr--;
1872 sources += 2;
1873 }
1874 this_dir += this;
1875 }
1876 /*
1878 * We don't report dirstat's for
1879 * - the top level
1880 * - or cases where everything came from a single directory
1881 * under this directory (sources == 1).
1882 */
1883 if (baselen && sources != 1) {
1884 if (this_dir) {
1885 int permille = this_dir * 1000 / changed;
1886 if (permille >= dir->permille) {
1887 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1888 permille / 10, permille % 10, baselen, base);
1889 if (!dir->cumulative)
1890 return 0;
1891 }
1892 }
1893 }
1894 return this_dir;
1895}
1896static int dirstat_compare(const void *_a, const void *_b)
1898{
1899 const struct dirstat_file *a = _a;
1900 const struct dirstat_file *b = _b;
1901 return strcmp(a->name, b->name);
1902}
1903static void show_dirstat(struct diff_options *options)
1905{
1906 int i;
1907 unsigned long changed;
1908 struct dirstat_dir dir;
1909 struct diff_queue_struct *q = &diff_queued_diff;
1910 dir.files = NULL;
1912 dir.alloc = 0;
1913 dir.nr = 0;
1914 dir.permille = options->dirstat_permille;
1915 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1916 changed = 0;
1918 for (i = 0; i < q->nr; i++) {
1919 struct diff_filepair *p = q->queue[i];
1920 const char *name;
1921 unsigned long copied, added, damage;
1922 int content_changed;
1923 name = p->two->path ? p->two->path : p->one->path;
1925 if (p->one->sha1_valid && p->two->sha1_valid)
1927 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1928 else
1929 content_changed = 1;
1930 if (!content_changed) {
1932 /*
1933 * The SHA1 has not changed, so pre-/post-content is
1934 * identical. We can therefore skip looking at the
1935 * file contents altogether.
1936 */
1937 damage = 0;
1938 goto found_damage;
1939 }
1940 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1942 /*
1943 * In --dirstat-by-file mode, we don't really need to
1944 * look at the actual file contents at all.
1945 * The fact that the SHA1 changed is enough for us to
1946 * add this file to the list of results
1947 * (with each file contributing equal damage).
1948 */
1949 damage = 1;
1950 goto found_damage;
1951 }
1952 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1954 diff_populate_filespec(p->one, 0);
1955 diff_populate_filespec(p->two, 0);
1956 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1957 &copied, &added);
1958 diff_free_filespec_data(p->one);
1959 diff_free_filespec_data(p->two);
1960 } else if (DIFF_FILE_VALID(p->one)) {
1961 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
1962 copied = added = 0;
1963 diff_free_filespec_data(p->one);
1964 } else if (DIFF_FILE_VALID(p->two)) {
1965 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
1966 copied = 0;
1967 added = p->two->size;
1968 diff_free_filespec_data(p->two);
1969 } else
1970 continue;
1971 /*
1973 * Original minus copied is the removed material,
1974 * added is the new material. They are both damages
1975 * made to the preimage.
1976 * If the resulting damage is zero, we know that
1977 * diffcore_count_changes() considers the two entries to
1978 * be identical, but since content_changed is true, we
1979 * know that there must have been _some_ kind of change,
1980 * so we force all entries to have damage > 0.
1981 */
1982 damage = (p->one->size - copied) + added;
1983 if (!damage)
1984 damage = 1;
1985found_damage:
1987 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1988 dir.files[dir.nr].name = name;
1989 dir.files[dir.nr].changed = damage;
1990 changed += damage;
1991 dir.nr++;
1992 }
1993 /* This can happen even with many files, if everything was renames */
1995 if (!changed)
1996 return;
1997 /* Show all directories with more than x% of the changes */
1999 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2000 gather_dirstat(options, &dir, changed, "", 0);
2001}
2002static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
2004{
2005 int i;
2006 unsigned long changed;
2007 struct dirstat_dir dir;
2008 if (data->nr == 0)
2010 return;
2011 dir.files = NULL;
2013 dir.alloc = 0;
2014 dir.nr = 0;
2015 dir.permille = options->dirstat_permille;
2016 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2017 changed = 0;
2019 for (i = 0; i < data->nr; i++) {
2020 struct diffstat_file *file = data->files[i];
2021 unsigned long damage = file->added + file->deleted;
2022 if (file->is_binary)
2023 /*
2024 * binary files counts bytes, not lines. Must find some
2025 * way to normalize binary bytes vs. textual lines.
2026 * The following heuristic assumes that there are 64
2027 * bytes per "line".
2028 * This is stupid and ugly, but very cheap...
2029 */
2030 damage = (damage + 63) / 64;
2031 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2032 dir.files[dir.nr].name = file->name;
2033 dir.files[dir.nr].changed = damage;
2034 changed += damage;
2035 dir.nr++;
2036 }
2037 /* This can happen even with many files, if everything was renames */
2039 if (!changed)
2040 return;
2041 /* Show all directories with more than x% of the changes */
2043 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2044 gather_dirstat(options, &dir, changed, "", 0);
2045}
2046static void free_diffstat_info(struct diffstat_t *diffstat)
2048{
2049 int i;
2050 for (i = 0; i < diffstat->nr; i++) {
2051 struct diffstat_file *f = diffstat->files[i];
2052 if (f->name != f->print_name)
2053 free(f->print_name);
2054 free(f->name);
2055 free(f->from_name);
2056 free(f);
2057 }
2058 free(diffstat->files);
2059}
2060struct checkdiff_t {
2062 const char *filename;
2063 int lineno;
2064 int conflict_marker_size;
2065 struct diff_options *o;
2066 unsigned ws_rule;
2067 unsigned status;
2068};
2069static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2071{
2072 char firstchar;
2073 int cnt;
2074 if (len < marker_size + 1)
2076 return 0;
2077 firstchar = line[0];
2078 switch (firstchar) {
2079 case '=': case '>': case '<': case '|':
2080 break;
2081 default:
2082 return 0;
2083 }
2084 for (cnt = 1; cnt < marker_size; cnt++)
2085 if (line[cnt] != firstchar)
2086 return 0;
2087 /* line[1] thru line[marker_size-1] are same as firstchar */
2088 if (len < marker_size + 1 || !isspace(line[marker_size]))
2089 return 0;
2090 return 1;
2091}
2092static void checkdiff_consume(void *priv, char *line, unsigned long len)
2094{
2095 struct checkdiff_t *data = priv;
2096 int marker_size = data->conflict_marker_size;
2097 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2098 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2099 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2100 char *err;
2101 const char *line_prefix;
2102 assert(data->o);
2104 line_prefix = diff_line_prefix(data->o);
2105 if (line[0] == '+') {
2107 unsigned bad;
2108 data->lineno++;
2109 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2110 data->status |= 1;
2111 fprintf(data->o->file,
2112 "%s%s:%d: leftover conflict marker\n",
2113 line_prefix, data->filename, data->lineno);
2114 }
2115 bad = ws_check(line + 1, len - 1, data->ws_rule);
2116 if (!bad)
2117 return;
2118 data->status |= bad;
2119 err = whitespace_error_string(bad);
2120 fprintf(data->o->file, "%s%s:%d: %s.\n",
2121 line_prefix, data->filename, data->lineno, err);
2122 free(err);
2123 emit_line(data->o, set, reset, line, 1);
2124 ws_check_emit(line + 1, len - 1, data->ws_rule,
2125 data->o->file, set, reset, ws);
2126 } else if (line[0] == ' ') {
2127 data->lineno++;
2128 } else if (line[0] == '@') {
2129 char *plus = strchr(line, '+');
2130 if (plus)
2131 data->lineno = strtol(plus, NULL, 10) - 1;
2132 else
2133 die("invalid diff");
2134 }
2135}
2136static unsigned char *deflate_it(char *data,
2138 unsigned long size,
2139 unsigned long *result_size)
2140{
2141 int bound;
2142 unsigned char *deflated;
2143 git_zstream stream;
2144 git_deflate_init(&stream, zlib_compression_level);
2146 bound = git_deflate_bound(&stream, size);
2147 deflated = xmalloc(bound);
2148 stream.next_out = deflated;
2149 stream.avail_out = bound;
2150 stream.next_in = (unsigned char *)data;
2152 stream.avail_in = size;
2153 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2154 ; /* nothing */
2155 git_deflate_end(&stream);
2156 *result_size = stream.total_out;
2157 return deflated;
2158}
2159static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2161 const char *prefix)
2162{
2163 void *cp;
2164 void *delta;
2165 void *deflated;
2166 void *data;
2167 unsigned long orig_size;
2168 unsigned long delta_size;
2169 unsigned long deflate_size;
2170 unsigned long data_size;
2171 /* We could do deflated delta, or we could do just deflated two,
2173 * whichever is smaller.
2174 */
2175 delta = NULL;
2176 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2177 if (one->size && two->size) {
2178 delta = diff_delta(one->ptr, one->size,
2179 two->ptr, two->size,
2180 &delta_size, deflate_size);
2181 if (delta) {
2182 void *to_free = delta;
2183 orig_size = delta_size;
2184 delta = deflate_it(delta, delta_size, &delta_size);
2185 free(to_free);
2186 }
2187 }
2188 if (delta && delta_size < deflate_size) {
2190 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2191 free(deflated);
2192 data = delta;
2193 data_size = delta_size;
2194 }
2195 else {
2196 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2197 free(delta);
2198 data = deflated;
2199 data_size = deflate_size;
2200 }
2201 /* emit data encoded in base85 */
2203 cp = data;
2204 while (data_size) {
2205 int bytes = (52 < data_size) ? 52 : data_size;
2206 char line[70];
2207 data_size -= bytes;
2208 if (bytes <= 26)
2209 line[0] = bytes + 'A' - 1;
2210 else
2211 line[0] = bytes - 26 + 'a' - 1;
2212 encode_85(line + 1, cp, bytes);
2213 cp = (char *) cp + bytes;
2214 fprintf(file, "%s", prefix);
2215 fputs(line, file);
2216 fputc('\n', file);
2217 }
2218 fprintf(file, "%s\n", prefix);
2219 free(data);
2220}
2221static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2223 const char *prefix)
2224{
2225 fprintf(file, "%sGIT binary patch\n", prefix);
2226 emit_binary_diff_body(file, one, two, prefix);
2227 emit_binary_diff_body(file, two, one, prefix);
2228}
2229int diff_filespec_is_binary(struct diff_filespec *one)
2231{
2232 if (one->is_binary == -1) {
2233 diff_filespec_load_driver(one);
2234 if (one->driver->binary != -1)
2235 one->is_binary = one->driver->binary;
2236 else {
2237 if (!one->data && DIFF_FILE_VALID(one))
2238 diff_populate_filespec(one, CHECK_BINARY);
2239 if (one->is_binary == -1 && one->data)
2240 one->is_binary = buffer_is_binary(one->data,
2241 one->size);
2242 if (one->is_binary == -1)
2243 one->is_binary = 0;
2244 }
2245 }
2246 return one->is_binary;
2247}
2248static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2250{
2251 diff_filespec_load_driver(one);
2252 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2253}
2254void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2256{
2257 if (!options->a_prefix)
2258 options->a_prefix = a;
2259 if (!options->b_prefix)
2260 options->b_prefix = b;
2261}
2262struct userdiff_driver *get_textconv(struct diff_filespec *one)
2264{
2265 if (!DIFF_FILE_VALID(one))
2266 return NULL;
2267 diff_filespec_load_driver(one);
2269 return userdiff_get_textconv(one->driver);
2270}
2271static void builtin_diff(const char *name_a,
2273 const char *name_b,
2274 struct diff_filespec *one,
2275 struct diff_filespec *two,
2276 const char *xfrm_msg,
2277 int must_show_header,
2278 struct diff_options *o,
2279 int complete_rewrite)
2280{
2281 mmfile_t mf1, mf2;
2282 const char *lbl[2];
2283 char *a_one, *b_two;
2284 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2285 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2286 const char *a_prefix, *b_prefix;
2287 struct userdiff_driver *textconv_one = NULL;
2288 struct userdiff_driver *textconv_two = NULL;
2289 struct strbuf header = STRBUF_INIT;
2290 const char *line_prefix = diff_line_prefix(o);
2291 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2293 (!one->mode || S_ISGITLINK(one->mode)) &&
2294 (!two->mode || S_ISGITLINK(two->mode))) {
2295 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2296 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2297 show_submodule_summary(o->file, one->path ? one->path : two->path,
2298 line_prefix,
2299 one->sha1, two->sha1, two->dirty_submodule,
2300 meta, del, add, reset);
2301 return;
2302 }
2303 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2305 textconv_one = get_textconv(one);
2306 textconv_two = get_textconv(two);
2307 }
2308 diff_set_mnemonic_prefix(o, "a/", "b/");
2310 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2311 a_prefix = o->b_prefix;
2312 b_prefix = o->a_prefix;
2313 } else {
2314 a_prefix = o->a_prefix;
2315 b_prefix = o->b_prefix;
2316 }
2317 /* Never use a non-valid filename anywhere if at all possible */
2319 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2320 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2321 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2323 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2324 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2325 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2326 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2327 if (lbl[0][0] == '/') {
2328 /* /dev/null */
2329 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2330 if (xfrm_msg)
2331 strbuf_addstr(&header, xfrm_msg);
2332 must_show_header = 1;
2333 }
2334 else if (lbl[1][0] == '/') {
2335 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2336 if (xfrm_msg)
2337 strbuf_addstr(&header, xfrm_msg);
2338 must_show_header = 1;
2339 }
2340 else {
2341 if (one->mode != two->mode) {
2342 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2343 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2344 must_show_header = 1;
2345 }
2346 if (xfrm_msg)
2347 strbuf_addstr(&header, xfrm_msg);
2348 /*
2350 * we do not run diff between different kind
2351 * of objects.
2352 */
2353 if ((one->mode ^ two->mode) & S_IFMT)
2354 goto free_ab_and_return;
2355 if (complete_rewrite &&
2356 (textconv_one || !diff_filespec_is_binary(one)) &&
2357 (textconv_two || !diff_filespec_is_binary(two))) {
2358 fprintf(o->file, "%s", header.buf);
2359 strbuf_reset(&header);
2360 emit_rewrite_diff(name_a, name_b, one, two,
2361 textconv_one, textconv_two, o);
2362 o->found_changes = 1;
2363 goto free_ab_and_return;
2364 }
2365 }
2366 if (o->irreversible_delete && lbl[1][0] == '/') {
2368 fprintf(o->file, "%s", header.buf);
2369 strbuf_reset(&header);
2370 goto free_ab_and_return;
2371 } else if (!DIFF_OPT_TST(o, TEXT) &&
2372 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2373 (!textconv_two && diff_filespec_is_binary(two)) )) {
2374 if (!one->data && !two->data &&
2375 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2376 !DIFF_OPT_TST(o, BINARY)) {
2377 if (!hashcmp(one->sha1, two->sha1)) {
2378 if (must_show_header)
2379 fprintf(o->file, "%s", header.buf);
2380 goto free_ab_and_return;
2381 }
2382 fprintf(o->file, "%s", header.buf);
2383 fprintf(o->file, "%sBinary files %s and %s differ\n",
2384 line_prefix, lbl[0], lbl[1]);
2385 goto free_ab_and_return;
2386 }
2387 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2388 die("unable to read files to diff");
2389 /* Quite common confusing case */
2390 if (mf1.size == mf2.size &&
2391 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2392 if (must_show_header)
2393 fprintf(o->file, "%s", header.buf);
2394 goto free_ab_and_return;
2395 }
2396 fprintf(o->file, "%s", header.buf);
2397 strbuf_reset(&header);
2398 if (DIFF_OPT_TST(o, BINARY))
2399 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2400 else
2401 fprintf(o->file, "%sBinary files %s and %s differ\n",
2402 line_prefix, lbl[0], lbl[1]);
2403 o->found_changes = 1;
2404 } else {
2405 /* Crazy xdl interfaces.. */
2406 const char *diffopts = getenv("GIT_DIFF_OPTS");
2407 const char *v;
2408 xpparam_t xpp;
2409 xdemitconf_t xecfg;
2410 struct emit_callback ecbdata;
2411 const struct userdiff_funcname *pe;
2412 if (must_show_header) {
2414 fprintf(o->file, "%s", header.buf);
2415 strbuf_reset(&header);
2416 }
2417 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2419 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2420 pe = diff_funcname_pattern(one);
2422 if (!pe)
2423 pe = diff_funcname_pattern(two);
2424 memset(&xpp, 0, sizeof(xpp));
2426 memset(&xecfg, 0, sizeof(xecfg));
2427 memset(&ecbdata, 0, sizeof(ecbdata));
2428 ecbdata.label_path = lbl;
2429 ecbdata.color_diff = want_color(o->use_color);
2430 ecbdata.found_changesp = &o->found_changes;
2431 ecbdata.ws_rule = whitespace_rule(name_b);
2432 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2433 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2434 ecbdata.opt = o;
2435 ecbdata.header = header.len ? &header : NULL;
2436 xpp.flags = o->xdl_opts;
2437 xecfg.ctxlen = o->context;
2438 xecfg.interhunkctxlen = o->interhunkcontext;
2439 xecfg.flags = XDL_EMIT_FUNCNAMES;
2440 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2441 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2442 if (pe)
2443 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2444 if (!diffopts)
2445 ;
2446 else if (skip_prefix(diffopts, "--unified=", &v))
2447 xecfg.ctxlen = strtoul(v, NULL, 10);
2448 else if (skip_prefix(diffopts, "-u", &v))
2449 xecfg.ctxlen = strtoul(v, NULL, 10);
2450 if (o->word_diff)
2451 init_diff_words_data(&ecbdata, o, one, two);
2452 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2453 &xpp, &xecfg))
2454 die("unable to generate diff for %s", one->path);
2455 if (o->word_diff)
2456 free_diff_words_data(&ecbdata);
2457 if (textconv_one)
2458 free(mf1.ptr);
2459 if (textconv_two)
2460 free(mf2.ptr);
2461 xdiff_clear_find_func(&xecfg);
2462 }
2463 free_ab_and_return:
2465 strbuf_release(&header);
2466 diff_free_filespec_data(one);
2467 diff_free_filespec_data(two);
2468 free(a_one);
2469 free(b_two);
2470 return;
2471}
2472static void builtin_diffstat(const char *name_a, const char *name_b,
2474 struct diff_filespec *one,
2475 struct diff_filespec *two,
2476 struct diffstat_t *diffstat,
2477 struct diff_options *o,
2478 struct diff_filepair *p)
2479{
2480 mmfile_t mf1, mf2;
2481 struct diffstat_file *data;
2482 int same_contents;
2483 int complete_rewrite = 0;
2484 if (!DIFF_PAIR_UNMERGED(p)) {
2486 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2487 complete_rewrite = 1;
2488 }
2489 data = diffstat_add(diffstat, name_a, name_b);
2491 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2492 if (!one || !two) {
2494 data->is_unmerged = 1;
2495 return;
2496 }
2497 same_contents = !hashcmp(one->sha1, two->sha1);
2499 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2501 data->is_binary = 1;
2502 if (same_contents) {
2503 data->added = 0;
2504 data->deleted = 0;
2505 } else {
2506 data->added = diff_filespec_size(two);
2507 data->deleted = diff_filespec_size(one);
2508 }
2509 }
2510 else if (complete_rewrite) {
2512 diff_populate_filespec(one, 0);
2513 diff_populate_filespec(two, 0);
2514 data->deleted = count_lines(one->data, one->size);
2515 data->added = count_lines(two->data, two->size);
2516 }
2517 else if (!same_contents) {
2519 /* Crazy xdl interfaces.. */
2520 xpparam_t xpp;
2521 xdemitconf_t xecfg;
2522 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2524 die("unable to read files to diff");
2525 memset(&xpp, 0, sizeof(xpp));
2527 memset(&xecfg, 0, sizeof(xecfg));
2528 xpp.flags = o->xdl_opts;
2529 xecfg.ctxlen = o->context;
2530 xecfg.interhunkctxlen = o->interhunkcontext;
2531 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2532 &xpp, &xecfg))
2533 die("unable to generate diffstat for %s", one->path);
2534 }
2535 diff_free_filespec_data(one);
2537 diff_free_filespec_data(two);
2538}
2539static void builtin_checkdiff(const char *name_a, const char *name_b,
2541 const char *attr_path,
2542 struct diff_filespec *one,
2543 struct diff_filespec *two,
2544 struct diff_options *o)
2545{
2546 mmfile_t mf1, mf2;
2547 struct checkdiff_t data;
2548 if (!two)
2550 return;
2551 memset(&data, 0, sizeof(data));
2553 data.filename = name_b ? name_b : name_a;
2554 data.lineno = 0;
2555 data.o = o;
2556 data.ws_rule = whitespace_rule(attr_path);
2557 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2558 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2560 die("unable to read files to diff");
2561 /*
2563 * All the other codepaths check both sides, but not checking
2564 * the "old" side here is deliberate. We are checking the newly
2565 * introduced changes, and as long as the "new" side is text, we
2566 * can and should check what it introduces.
2567 */
2568 if (diff_filespec_is_binary(two))
2569 goto free_and_return;
2570 else {
2571 /* Crazy xdl interfaces.. */
2572 xpparam_t xpp;
2573 xdemitconf_t xecfg;
2574 memset(&xpp, 0, sizeof(xpp));
2576 memset(&xecfg, 0, sizeof(xecfg));
2577 xecfg.ctxlen = 1; /* at least one context line */
2578 xpp.flags = 0;
2579 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2580 &xpp, &xecfg))
2581 die("unable to generate checkdiff for %s", one->path);
2582 if (data.ws_rule & WS_BLANK_AT_EOF) {
2584 struct emit_callback ecbdata;
2585 int blank_at_eof;
2586 ecbdata.ws_rule = data.ws_rule;
2588 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2589 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2590 if (blank_at_eof) {
2592 static char *err;
2593 if (!err)
2594 err = whitespace_error_string(WS_BLANK_AT_EOF);
2595 fprintf(o->file, "%s:%d: %s.\n",
2596 data.filename, blank_at_eof, err);
2597 data.status = 1; /* report errors */
2598 }
2599 }
2600 }
2601 free_and_return:
2602 diff_free_filespec_data(one);
2603 diff_free_filespec_data(two);
2604 if (data.status)
2605 DIFF_OPT_SET(o, CHECK_FAILED);
2606}
2607struct diff_filespec *alloc_filespec(const char *path)
2609{
2610 struct diff_filespec *spec;
2611 FLEXPTR_ALLOC_STR(spec, path, path);
2613 spec->count = 1;
2614 spec->is_binary = -1;
2615 return spec;
2616}
2617void free_filespec(struct diff_filespec *spec)
2619{
2620 if (!--spec->count) {
2621 diff_free_filespec_data(spec);
2622 free(spec);
2623 }
2624}
2625void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2627 int sha1_valid, unsigned short mode)
2628{
2629 if (mode) {
2630 spec->mode = canon_mode(mode);
2631 hashcpy(spec->sha1, sha1);
2632 spec->sha1_valid = sha1_valid;
2633 }
2634}
2635/*
2637 * Given a name and sha1 pair, if the index tells us the file in
2638 * the work tree has that object contents, return true, so that
2639 * prepare_temp_file() does not have to inflate and extract.
2640 */
2641static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2642{
2643 const struct cache_entry *ce;
2644 struct stat st;
2645 int pos, len;
2646 /*
2648 * We do not read the cache ourselves here, because the
2649 * benchmark with my previous version that always reads cache
2650 * shows that it makes things worse for diff-tree comparing
2651 * two linux-2.6 kernel trees in an already checked out work
2652 * tree. This is because most diff-tree comparisons deal with
2653 * only a small number of files, while reading the cache is
2654 * expensive for a large project, and its cost outweighs the
2655 * savings we get by not inflating the object to a temporary
2656 * file. Practically, this code only helps when we are used
2657 * by diff-cache --cached, which does read the cache before
2658 * calling us.
2659 */
2660 if (!active_cache)
2661 return 0;
2662 /* We want to avoid the working directory if our caller
2664 * doesn't need the data in a normal file, this system
2665 * is rather slow with its stat/open/mmap/close syscalls,
2666 * and the object is contained in a pack file. The pack
2667 * is probably already open and will be faster to obtain
2668 * the data through than the working directory. Loose
2669 * objects however would tend to be slower as they need
2670 * to be individually opened and inflated.
2671 */
2672 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2673 return 0;
2674 len = strlen(name);
2676 pos = cache_name_pos(name, len);
2677 if (pos < 0)
2678 return 0;
2679 ce = active_cache[pos];
2680 /*
2682 * This is not the sha1 we are looking for, or
2683 * unreusable because it is not a regular file.
2684 */
2685 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2686 return 0;
2687 /*
2689 * If ce is marked as "assume unchanged", there is no
2690 * guarantee that work tree matches what we are looking for.
2691 */
2692 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2693 return 0;
2694 /*
2696 * If ce matches the file in the work tree, we can reuse it.
2697 */
2698 if (ce_uptodate(ce) ||
2699 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2700 return 1;
2701 return 0;
2703}
2704static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2706{
2707 struct strbuf buf = STRBUF_INIT;
2708 char *dirty = "";
2709 /* Are we looking at the work tree? */
2711 if (s->dirty_submodule)
2712 dirty = "-dirty";
2713 strbuf_addf(&buf, "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2715 s->size = buf.len;
2716 if (size_only) {
2717 s->data = NULL;
2718 strbuf_release(&buf);
2719 } else {
2720 s->data = strbuf_detach(&buf, NULL);
2721 s->should_free = 1;
2722 }
2723 return 0;
2724}
2725/*
2727 * While doing rename detection and pickaxe operation, we may need to
2728 * grab the data for the blob (or file) for our own in-core comparison.
2729 * diff_filespec has data and size fields for this purpose.
2730 */
2731int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
2732{
2733 int size_only = flags & CHECK_SIZE_ONLY;
2734 int err = 0;
2735 /*
2736 * demote FAIL to WARN to allow inspecting the situation
2737 * instead of refusing.
2738 */
2739 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2740 ? SAFE_CRLF_WARN
2741 : safe_crlf);
2742 if (!DIFF_FILE_VALID(s))
2744 die("internal error: asking to populate invalid file.");
2745 if (S_ISDIR(s->mode))
2746 return -1;
2747 if (s->data)
2749 return 0;
2750 if (size_only && 0 < s->size)
2752 return 0;
2753 if (S_ISGITLINK(s->mode))
2755 return diff_populate_gitlink(s, size_only);
2756 if (!s->sha1_valid ||
2758 reuse_worktree_file(s->path, s->sha1, 0)) {
2759 struct strbuf buf = STRBUF_INIT;
2760 struct stat st;
2761 int fd;
2762 if (lstat(s->path, &st) < 0) {
2764 if (errno == ENOENT) {
2765 err_empty:
2766 err = -1;
2767 empty:
2768 s->data = (char *)"";
2769 s->size = 0;
2770 return err;
2771 }
2772 }
2773 s->size = xsize_t(st.st_size);
2774 if (!s->size)
2775 goto empty;
2776 if (S_ISLNK(st.st_mode)) {
2777 struct strbuf sb = STRBUF_INIT;
2778 if (strbuf_readlink(&sb, s->path, s->size))
2780 goto err_empty;
2781 s->size = sb.len;
2782 s->data = strbuf_detach(&sb, NULL);
2783 s->should_free = 1;
2784 return 0;
2785 }
2786 /*
2788 * Even if the caller would be happy with getting
2789 * only the size, we cannot return early at this
2790 * point if the path requires us to run the content
2791 * conversion.
2792 */
2793 if (size_only && !would_convert_to_git(s->path))
2794 return 0;
2795 /*
2797 * Note: this check uses xsize_t(st.st_size) that may
2798 * not be the true size of the blob after it goes
2799 * through convert_to_git(). This may not strictly be
2800 * correct, but the whole point of big_file_threshold
2801 * and is_binary check being that we want to avoid
2802 * opening the file and inspecting the contents, this
2803 * is probably fine.
2804 */
2805 if ((flags & CHECK_BINARY) &&
2806 s->size > big_file_threshold && s->is_binary == -1) {
2807 s->is_binary = 1;
2808 return 0;
2809 }
2810 fd = open(s->path, O_RDONLY);
2811 if (fd < 0)
2812 goto err_empty;
2813 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2814 close(fd);
2815 s->should_munmap = 1;
2816 /*
2818 * Convert from working tree format to canonical git format
2819 */
2820 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2821 size_t size = 0;
2822 munmap(s->data, s->size);
2823 s->should_munmap = 0;
2824 s->data = strbuf_detach(&buf, &size);
2825 s->size = size;
2826 s->should_free = 1;
2827 }
2828 }
2829 else {
2830 enum object_type type;
2831 if (size_only || (flags & CHECK_BINARY)) {
2832 type = sha1_object_info(s->sha1, &s->size);
2833 if (type < 0)
2834 die("unable to read %s", sha1_to_hex(s->sha1));
2835 if (size_only)
2836 return 0;
2837 if (s->size > big_file_threshold && s->is_binary == -1) {
2838 s->is_binary = 1;
2839 return 0;
2840 }
2841 }
2842 s->data = read_sha1_file(s->sha1, &type, &s->size);
2843 if (!s->data)
2844 die("unable to read %s", sha1_to_hex(s->sha1));
2845 s->should_free = 1;
2846 }
2847 return 0;
2848}
2849void diff_free_filespec_blob(struct diff_filespec *s)
2851{
2852 if (s->should_free)
2853 free(s->data);
2854 else if (s->should_munmap)
2855 munmap(s->data, s->size);
2856 if (s->should_free || s->should_munmap) {
2858 s->should_free = s->should_munmap = 0;
2859 s->data = NULL;
2860 }
2861}
2862void diff_free_filespec_data(struct diff_filespec *s)
2864{
2865 diff_free_filespec_blob(s);
2866 free(s->cnt_data);
2867 s->cnt_data = NULL;
2868}
2869static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2871 void *blob,
2872 unsigned long size,
2873 const unsigned char *sha1,
2874 int mode)
2875{
2876 int fd;
2877 struct strbuf buf = STRBUF_INIT;
2878 struct strbuf template = STRBUF_INIT;
2879 char *path_dup = xstrdup(path);
2880 const char *base = basename(path_dup);
2881 /* Generate "XXXXXX_basename.ext" */
2883 strbuf_addstr(&template, "XXXXXX_");
2884 strbuf_addstr(&template, base);
2885 fd = mks_tempfile_ts(&temp->tempfile, template.buf, strlen(base) + 1);
2887 if (fd < 0)
2888 die_errno("unable to create temp-file");
2889 if (convert_to_working_tree(path,
2890 (const char *)blob, (size_t)size, &buf)) {
2891 blob = buf.buf;
2892 size = buf.len;
2893 }
2894 if (write_in_full(fd, blob, size) != size)
2895 die_errno("unable to write temp-file");
2896 close_tempfile(&temp->tempfile);
2897 temp->name = get_tempfile_path(&temp->tempfile);
2898 sha1_to_hex_r(temp->hex, sha1);
2899 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
2900 strbuf_release(&buf);
2901 strbuf_release(&template);
2902 free(path_dup);
2903}
2904static struct diff_tempfile *prepare_temp_file(const char *name,
2906 struct diff_filespec *one)
2907{
2908 struct diff_tempfile *temp = claim_diff_tempfile();
2909 if (!DIFF_FILE_VALID(one)) {
2911 not_a_valid_file:
2912 /* A '-' entry produces this for file-2, and
2913 * a '+' entry produces this for file-1.
2914 */
2915 temp->name = "/dev/null";
2916 xsnprintf(temp->hex, sizeof(temp->hex), ".");
2917 xsnprintf(temp->mode, sizeof(temp->mode), ".");
2918 return temp;
2919 }
2920 if (!S_ISGITLINK(one->mode) &&
2922 (!one->sha1_valid ||
2923 reuse_worktree_file(name, one->sha1, 1))) {
2924 struct stat st;
2925 if (lstat(name, &st) < 0) {
2926 if (errno == ENOENT)
2927 goto not_a_valid_file;
2928 die_errno("stat(%s)", name);
2929 }
2930 if (S_ISLNK(st.st_mode)) {
2931 struct strbuf sb = STRBUF_INIT;
2932 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2933 die_errno("readlink(%s)", name);
2934 prep_temp_blob(name, temp, sb.buf, sb.len,
2935 (one->sha1_valid ?
2936 one->sha1 : null_sha1),
2937 (one->sha1_valid ?
2938 one->mode : S_IFLNK));
2939 strbuf_release(&sb);
2940 }
2941 else {
2942 /* we can borrow from the file in the work tree */
2943 temp->name = name;
2944 if (!one->sha1_valid)
2945 sha1_to_hex_r(temp->hex, null_sha1);
2946 else
2947 sha1_to_hex_r(temp->hex, one->sha1);
2948 /* Even though we may sometimes borrow the
2949 * contents from the work tree, we always want
2950 * one->mode. mode is trustworthy even when
2951 * !(one->sha1_valid), as long as
2952 * DIFF_FILE_VALID(one).
2953 */
2954 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
2955 }
2956 return temp;
2957 }
2958 else {
2959 if (diff_populate_filespec(one, 0))
2960 die("cannot read data blob for %s", one->path);
2961 prep_temp_blob(name, temp, one->data, one->size,
2962 one->sha1, one->mode);
2963 }
2964 return temp;
2965}
2966static void add_external_diff_name(struct argv_array *argv,
2968 const char *name,
2969 struct diff_filespec *df)
2970{
2971 struct diff_tempfile *temp = prepare_temp_file(name, df);
2972 argv_array_push(argv, temp->name);
2973 argv_array_push(argv, temp->hex);
2974 argv_array_push(argv, temp->mode);
2975}
2976/* An external diff command takes:
2978 *
2979 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2980 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2981 *
2982 */
2983static void run_external_diff(const char *pgm,
2984 const char *name,
2985 const char *other,
2986 struct diff_filespec *one,
2987 struct diff_filespec *two,
2988 const char *xfrm_msg,
2989 int complete_rewrite,
2990 struct diff_options *o)
2991{
2992 struct argv_array argv = ARGV_ARRAY_INIT;
2993 struct argv_array env = ARGV_ARRAY_INIT;
2994 struct diff_queue_struct *q = &diff_queued_diff;
2995 argv_array_push(&argv, pgm);
2997 argv_array_push(&argv, name);
2998 if (one && two) {
3000 add_external_diff_name(&argv, name, one);
3001 if (!other)
3002 add_external_diff_name(&argv, name, two);
3003 else {
3004 add_external_diff_name(&argv, other, two);
3005 argv_array_push(&argv, other);
3006 argv_array_push(&argv, xfrm_msg);
3007 }
3008 }
3009 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
3011 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
3012 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
3014 die(_("external diff died, stopping at %s"), name);
3015 remove_tempfile();
3017 argv_array_clear(&argv);
3018 argv_array_clear(&env);
3019}
3020static int similarity_index(struct diff_filepair *p)
3022{
3023 return p->score * 100 / MAX_SCORE;
3024}
3025static void fill_metainfo(struct strbuf *msg,
3027 const char *name,
3028 const char *other,
3029 struct diff_filespec *one,
3030 struct diff_filespec *two,
3031 struct diff_options *o,
3032 struct diff_filepair *p,
3033 int *must_show_header,
3034 int use_color)
3035{
3036 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3037 const char *reset = diff_get_color(use_color, DIFF_RESET);
3038 const char *line_prefix = diff_line_prefix(o);
3039 *must_show_header = 1;
3041 strbuf_init(msg, PATH_MAX * 2 + 300);
3042 switch (p->status) {
3043 case DIFF_STATUS_COPIED:
3044 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3045 line_prefix, set, similarity_index(p));
3046 strbuf_addf(msg, "%s\n%s%scopy from ",
3047 reset, line_prefix, set);
3048 quote_c_style(name, msg, NULL, 0);
3049 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3050 quote_c_style(other, msg, NULL, 0);
3051 strbuf_addf(msg, "%s\n", reset);
3052 break;
3053 case DIFF_STATUS_RENAMED:
3054 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3055 line_prefix, set, similarity_index(p));
3056 strbuf_addf(msg, "%s\n%s%srename from ",
3057 reset, line_prefix, set);
3058 quote_c_style(name, msg, NULL, 0);
3059 strbuf_addf(msg, "%s\n%s%srename to ",
3060 reset, line_prefix, set);
3061 quote_c_style(other, msg, NULL, 0);
3062 strbuf_addf(msg, "%s\n", reset);
3063 break;
3064 case DIFF_STATUS_MODIFIED:
3065 if (p->score) {
3066 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3067 line_prefix,
3068 set, similarity_index(p), reset);
3069 break;
3070 }
3071 /* fallthru */
3072 default:
3073 *must_show_header = 0;
3074 }
3075 if (one && two && hashcmp(one->sha1, two->sha1)) {
3076 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3077 if (DIFF_OPT_TST(o, BINARY)) {
3079 mmfile_t mf;
3080 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3081 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3082 abbrev = 40;
3083 }
3084 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3085 find_unique_abbrev(one->sha1, abbrev));
3086 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3087 if (one->mode == two->mode)
3088 strbuf_addf(msg, " %06o", one->mode);
3089 strbuf_addf(msg, "%s\n", reset);
3090 }
3091}
3092static void run_diff_cmd(const char *pgm,
3094 const char *name,
3095 const char *other,
3096 const char *attr_path,
3097 struct diff_filespec *one,
3098 struct diff_filespec *two,
3099 struct strbuf *msg,
3100 struct diff_options *o,
3101 struct diff_filepair *p)
3102{
3103 const char *xfrm_msg = NULL;
3104 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3105 int must_show_header = 0;
3106 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3109 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3110 if (drv && drv->external)
3111 pgm = drv->external;
3112 }
3113 if (msg) {
3115 /*
3116 * don't use colors when the header is intended for an
3117 * external diff driver
3118 */
3119 fill_metainfo(msg, name, other, one, two, o, p,
3120 &must_show_header,
3121 want_color(o->use_color) && !pgm);
3122 xfrm_msg = msg->len ? msg->buf : NULL;
3123 }
3124 if (pgm) {
3126 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3127 complete_rewrite, o);
3128 return;
3129 }
3130 if (one && two)
3131 builtin_diff(name, other ? other : name,
3132 one, two, xfrm_msg, must_show_header,
3133 o, complete_rewrite);
3134 else
3135 fprintf(o->file, "* Unmerged path %s\n", name);
3136}
3137static void diff_fill_sha1_info(struct diff_filespec *one)
3139{
3140 if (DIFF_FILE_VALID(one)) {
3141 if (!one->sha1_valid) {
3142 struct stat st;
3143 if (one->is_stdin) {
3144 hashcpy(one->sha1, null_sha1);
3145 return;
3146 }
3147 if (lstat(one->path, &st) < 0)
3148 die_errno("stat '%s'", one->path);
3149 if (index_path(one->sha1, one->path, &st, 0))
3150 die("cannot hash %s", one->path);
3151 }
3152 }
3153 else
3154 hashclr(one->sha1);
3155}
3156static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3158{
3159 /* Strip the prefix but do not molest /dev/null and absolute paths */
3160 if (*namep && **namep != '/') {
3161 *namep += prefix_length;
3162 if (**namep == '/')
3163 ++*namep;
3164 }
3165 if (*otherp && **otherp != '/') {
3166 *otherp += prefix_length;
3167 if (**otherp == '/')
3168 ++*otherp;
3169 }
3170}
3171static void run_diff(struct diff_filepair *p, struct diff_options *o)
3173{
3174 const char *pgm = external_diff();
3175 struct strbuf msg;
3176 struct diff_filespec *one = p->one;
3177 struct diff_filespec *two = p->two;
3178 const char *name;
3179 const char *other;
3180 const char *attr_path;
3181 name = p->one->path;
3183 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3184 attr_path = name;
3185 if (o->prefix_length)
3186 strip_prefix(o->prefix_length, &name, &other);
3187 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3189 pgm = NULL;
3190 if (DIFF_PAIR_UNMERGED(p)) {
3192 run_diff_cmd(pgm, name, NULL, attr_path,
3193 NULL, NULL, NULL, o, p);
3194 return;
3195 }
3196 diff_fill_sha1_info(one);
3198 diff_fill_sha1_info(two);
3199 if (!pgm &&
3201 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3202 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3203 /*
3204 * a filepair that changes between file and symlink
3205 * needs to be split into deletion and creation.
3206 */
3207 struct diff_filespec *null = alloc_filespec(two->path);
3208 run_diff_cmd(NULL, name, other, attr_path,
3209 one, null, &msg, o, p);
3210 free(null);
3211 strbuf_release(&msg);
3212 null = alloc_filespec(one->path);
3214 run_diff_cmd(NULL, name, other, attr_path,
3215 null, two, &msg, o, p);
3216 free(null);
3217 }
3218 else
3219 run_diff_cmd(pgm, name, other, attr_path,
3220 one, two, &msg, o, p);
3221 strbuf_release(&msg);
3223}
3224static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3226 struct diffstat_t *diffstat)
3227{
3228 const char *name;
3229 const char *other;
3230 if (DIFF_PAIR_UNMERGED(p)) {
3232 /* unmerged */
3233 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3234 return;
3235 }
3236 name = p->one->path;
3238 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3239 if (o->prefix_length)
3241 strip_prefix(o->prefix_length, &name, &other);
3242 diff_fill_sha1_info(p->one);
3244 diff_fill_sha1_info(p->two);
3245 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3247}
3248static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3250{
3251 const char *name;
3252 const char *other;
3253 const char *attr_path;
3254 if (DIFF_PAIR_UNMERGED(p)) {
3256 /* unmerged */
3257 return;
3258 }
3259 name = p->one->path;
3261 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3262 attr_path = other ? other : name;
3263 if (o->prefix_length)
3265 strip_prefix(o->prefix_length, &name, &other);
3266 diff_fill_sha1_info(p->one);
3268 diff_fill_sha1_info(p->two);
3269 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3271}
3272void diff_setup(struct diff_options *options)
3274{
3275 memcpy(options, &default_diff_options, sizeof(*options));
3276 options->file = stdout;
3278 options->line_termination = '\n';
3280 options->break_opt = -1;
3281 options->rename_limit = -1;
3282 options->dirstat_permille = diff_dirstat_permille_default;
3283 options->context = diff_context_default;
3284 options->ws_error_highlight = WSEH_NEW;
3285 DIFF_OPT_SET(options, RENAME_EMPTY);
3286 /* pathchange left =NULL by default */
3288 options->change = diff_change;
3289 options->add_remove = diff_addremove;
3290 options->use_color = diff_use_color_default;
3291 options->detect_rename = diff_detect_rename_default;
3292 options->xdl_opts |= diff_algorithm;
3293 options->orderfile = diff_order_file_cfg;
3295 if (diff_no_prefix) {
3297 options->a_prefix = options->b_prefix = "";
3298 } else if (!diff_mnemonic_prefix) {
3299 options->a_prefix = "a/";
3300 options->b_prefix = "b/";
3301 }
3302}
3303void diff_setup_done(struct diff_options *options)
3305{
3306 int count = 0;
3307 if (options->set_default)
3309 options->set_default(options);
3310 if (options->output_format & DIFF_FORMAT_NAME)
3312 count++;
3313 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3314 count++;
3315 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3316 count++;
3317 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3318 count++;
3319 if (count > 1)
3320 die("--name-only, --name-status, --check and -s are mutually exclusive");
3321 /*
3323 * Most of the time we can say "there are changes"
3324 * only by checking if there are changed paths, but
3325 * --ignore-whitespace* options force us to look
3326 * inside contents.
3327 */
3328 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3330 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3331 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3332 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3333 else
3334 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3335 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3337 options->detect_rename = DIFF_DETECT_COPY;
3338 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3340 options->prefix = NULL;
3341 if (options->prefix)
3342 options->prefix_length = strlen(options->prefix);
3343 else
3344 options->prefix_length = 0;
3345 if (options->output_format & (DIFF_FORMAT_NAME |
3347 DIFF_FORMAT_NAME_STATUS |
3348 DIFF_FORMAT_CHECKDIFF |
3349 DIFF_FORMAT_NO_OUTPUT))
3350 options->output_format &= ~(DIFF_FORMAT_RAW |
3351 DIFF_FORMAT_NUMSTAT |
3352 DIFF_FORMAT_DIFFSTAT |
3353 DIFF_FORMAT_SHORTSTAT |
3354 DIFF_FORMAT_DIRSTAT |
3355 DIFF_FORMAT_SUMMARY |
3356 DIFF_FORMAT_PATCH);
3357 /*
3359 * These cases always need recursive; we do not drop caller-supplied
3360 * recursive bits for other formats here.
3361 */
3362 if (options->output_format & (DIFF_FORMAT_PATCH |
3363 DIFF_FORMAT_NUMSTAT |
3364 DIFF_FORMAT_DIFFSTAT |
3365 DIFF_FORMAT_SHORTSTAT |
3366 DIFF_FORMAT_DIRSTAT |
3367 DIFF_FORMAT_SUMMARY |
3368 DIFF_FORMAT_CHECKDIFF))
3369 DIFF_OPT_SET(options, RECURSIVE);
3370 /*
3371 * Also pickaxe would not work very well if you do not say recursive
3372 */
3373 if (options->pickaxe)
3374 DIFF_OPT_SET(options, RECURSIVE);
3375 /*
3376 * When patches are generated, submodules diffed against the work tree
3377 * must be checked for dirtiness too so it can be shown in the output
3378 */
3379 if (options->output_format & DIFF_FORMAT_PATCH)
3380 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3381 if (options->detect_rename && options->rename_limit < 0)
3383 options->rename_limit = diff_rename_limit_default;
3384 if (options->setup & DIFF_SETUP_USE_CACHE) {
3385 if (!active_cache)
3386 /* read-cache does not die even when it fails
3387 * so it is safe for us to do this here. Also
3388 * it does not smudge active_cache or active_nr
3389 * when it fails, so we do not have to worry about
3390 * cleaning it up ourselves either.
3391 */
3392 read_cache();
3393 }
3394 if (options->abbrev <= 0 || 40 < options->abbrev)
3395 options->abbrev = 40; /* full */
3396 /*
3398 * It does not make sense to show the first hit we happened
3399 * to have found. It does not make sense not to return with
3400 * exit code in such a case either.
3401 */
3402 if (DIFF_OPT_TST(options, QUICK)) {
3403 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3404 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3405 }
3406 options->diff_path_counter = 0;
3408 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3410 die(_("--follow requires exactly one pathspec"));
3411}
3412static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3414{
3415 char c, *eq;
3416 int len;
3417 if (*arg != '-')
3419 return 0;
3420 c = *++arg;
3421 if (!c)
3422 return 0;
3423 if (c == arg_short) {
3424 c = *++arg;
3425 if (!c)
3426 return 1;
3427 if (val && isdigit(c)) {
3428 char *end;
3429 int n = strtoul(arg, &end, 10);
3430 if (*end)
3431 return 0;
3432 *val = n;
3433 return 1;
3434 }
3435 return 0;
3436 }
3437 if (c != '-')
3438 return 0;
3439 arg++;
3440 eq = strchrnul(arg, '=');
3441 len = eq - arg;
3442 if (!len || strncmp(arg, arg_long, len))
3443 return 0;
3444 if (*eq) {
3445 int n;
3446 char *end;
3447 if (!isdigit(*++eq))
3448 return 0;
3449 n = strtoul(eq, &end, 10);
3450 if (*end)
3451 return 0;
3452 *val = n;
3453 }
3454 return 1;
3455}
3456static int diff_scoreopt_parse(const char *opt);
3458static inline int short_opt(char opt, const char **argv,
3460 const char **optarg)
3461{
3462 const char *arg = argv[0];
3463 if (arg[0] != '-' || arg[1] != opt)
3464 return 0;
3465 if (arg[2] != '\0') {
3466 *optarg = arg + 2;
3467 return 1;
3468 }
3469 if (!argv[1])
3470 die("Option '%c' requires a value", opt);
3471 *optarg = argv[1];
3472 return 2;
3473}
3474int parse_long_opt(const char *opt, const char **argv,
3476 const char **optarg)
3477{
3478 const char *arg = argv[0];
3479 if (!skip_prefix(arg, "--", &arg))
3480 return 0;
3481 if (!skip_prefix(arg, opt, &arg))
3482 return 0;
3483 if (*arg == '=') { /* stuck form: --option=value */
3484 *optarg = arg + 1;
3485 return 1;
3486 }
3487 if (*arg != '\0')
3488 return 0;
3489 /* separate form: --option value */
3490 if (!argv[1])
3491 die("Option '--%s' requires a value", opt);
3492 *optarg = argv[1];
3493 return 2;
3494}
3495static int stat_opt(struct diff_options *options, const char **av)
3497{
3498 const char *arg = av[0];
3499 char *end;
3500 int width = options->stat_width;
3501 int name_width = options->stat_name_width;
3502 int graph_width = options->stat_graph_width;
3503 int count = options->stat_count;
3504 int argcount = 1;
3505 if (!skip_prefix(arg, "--stat", &arg))
3507 die("BUG: stat option does not begin with --stat: %s", arg);
3508 end = (char *)arg;
3509 switch (*arg) {
3511 case '-':
3512 if (skip_prefix(arg, "-width", &arg)) {
3513 if (*arg == '=')
3514 width = strtoul(arg + 1, &end, 10);
3515 else if (!*arg && !av[1])
3516 die("Option '--stat-width' requires a value");
3517 else if (!*arg) {
3518 width = strtoul(av[1], &end, 10);
3519 argcount = 2;
3520 }
3521 } else if (skip_prefix(arg, "-name-width", &arg)) {
3522 if (*arg == '=')
3523 name_width = strtoul(arg + 1, &end, 10);
3524 else if (!*arg && !av[1])
3525 die("Option '--stat-name-width' requires a value");
3526 else if (!*arg) {
3527 name_width = strtoul(av[1], &end, 10);
3528 argcount = 2;
3529 }
3530 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3531 if (*arg == '=')
3532 graph_width = strtoul(arg + 1, &end, 10);
3533 else if (!*arg && !av[1])
3534 die("Option '--stat-graph-width' requires a value");
3535 else if (!*arg) {
3536 graph_width = strtoul(av[1], &end, 10);
3537 argcount = 2;
3538 }
3539 } else if (skip_prefix(arg, "-count", &arg)) {
3540 if (*arg == '=')
3541 count = strtoul(arg + 1, &end, 10);
3542 else if (!*arg && !av[1])
3543 die("Option '--stat-count' requires a value");
3544 else if (!*arg) {
3545 count = strtoul(av[1], &end, 10);
3546 argcount = 2;
3547 }
3548 }
3549 break;
3550 case '=':
3551 width = strtoul(arg+1, &end, 10);
3552 if (*end == ',')
3553 name_width = strtoul(end+1, &end, 10);
3554 if (*end == ',')
3555 count = strtoul(end+1, &end, 10);
3556 }
3557 /* Important! This checks all the error cases! */
3559 if (*end)
3560 return 0;
3561 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3562 options->stat_name_width = name_width;
3563 options->stat_graph_width = graph_width;
3564 options->stat_width = width;
3565 options->stat_count = count;
3566 return argcount;
3567}
3568static int parse_dirstat_opt(struct diff_options *options, const char *params)
3570{
3571 struct strbuf errmsg = STRBUF_INIT;
3572 if (parse_dirstat_params(options, params, &errmsg))
3573 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3574 errmsg.buf);
3575 strbuf_release(&errmsg);
3576 /*
3577 * The caller knows a dirstat-related option is given from the command
3578 * line; allow it to say "return this_function();"
3579 */
3580 options->output_format |= DIFF_FORMAT_DIRSTAT;
3581 return 1;
3582}
3583static int parse_submodule_opt(struct diff_options *options, const char *value)
3585{
3586 if (parse_submodule_params(options, value))
3587 die(_("Failed to parse --submodule option parameter: '%s'"),
3588 value);
3589 return 1;
3590}
3591static const char diff_status_letters[] = {
3593 DIFF_STATUS_ADDED,
3594 DIFF_STATUS_COPIED,
3595 DIFF_STATUS_DELETED,
3596 DIFF_STATUS_MODIFIED,
3597 DIFF_STATUS_RENAMED,
3598 DIFF_STATUS_TYPE_CHANGED,
3599 DIFF_STATUS_UNKNOWN,
3600 DIFF_STATUS_UNMERGED,
3601 DIFF_STATUS_FILTER_AON,
3602 DIFF_STATUS_FILTER_BROKEN,
3603 '\0',
3604};
3605static unsigned int filter_bit['Z' + 1];
3607static void prepare_filter_bits(void)
3609{
3610 int i;
3611 if (!filter_bit[DIFF_STATUS_ADDED]) {
3613 for (i = 0; diff_status_letters[i]; i++)
3614 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3615 }
3616}
3617static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3619{
3620 return opt->filter & filter_bit[(int) status];
3621}
3622static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3624{
3625 int i, optch;
3626 prepare_filter_bits();
3628 /*
3630 * If there is a negation e.g. 'd' in the input, and we haven't
3631 * initialized the filter field with another --diff-filter, start
3632 * from full set of bits, except for AON.
3633 */
3634 if (!opt->filter) {
3635 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3636 if (optch < 'a' || 'z' < optch)
3637 continue;
3638 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3639 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3640 break;
3641 }
3642 }
3643 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3645 unsigned int bit;
3646 int negate;
3647 if ('a' <= optch && optch <= 'z') {
3649 negate = 1;
3650 optch = toupper(optch);
3651 } else {
3652 negate = 0;
3653 }
3654 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3656 if (!bit)
3657 return optarg[i];
3658 if (negate)
3659 opt->filter &= ~bit;
3660 else
3661 opt->filter |= bit;
3662 }
3663 return 0;
3664}
3665static void enable_patch_output(int *fmt) {
3667 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3668 *fmt |= DIFF_FORMAT_PATCH;
3669}
3670static int parse_one_token(const char **arg, const char *token)
3672{
3673 const char *rest;
3674 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
3675 *arg = rest;
3676 return 1;
3677 }
3678 return 0;
3679}
3680static int parse_ws_error_highlight(struct diff_options *opt, const char *arg)
3682{
3683 const char *orig_arg = arg;
3684 unsigned val = 0;
3685 while (*arg) {
3686 if (parse_one_token(&arg, "none"))
3687 val = 0;
3688 else if (parse_one_token(&arg, "default"))
3689 val = WSEH_NEW;
3690 else if (parse_one_token(&arg, "all"))
3691 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
3692 else if (parse_one_token(&arg, "new"))
3693 val |= WSEH_NEW;
3694 else if (parse_one_token(&arg, "old"))
3695 val |= WSEH_OLD;
3696 else if (parse_one_token(&arg, "context"))
3697 val |= WSEH_CONTEXT;
3698 else {
3699 error("unknown value after ws-error-highlight=%.*s",
3700 (int)(arg - orig_arg), orig_arg);
3701 return 0;
3702 }
3703 if (*arg)
3704 arg++;
3705 }
3706 opt->ws_error_highlight = val;
3707 return 1;
3708}
3709int diff_opt_parse(struct diff_options *options,
3711 const char **av, int ac, const char *prefix)
3712{
3713 const char *arg = av[0];
3714 const char *optarg;
3715 int argcount;
3716 if (!prefix)
3718 prefix = "";
3719 /* Output format options */
3721 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3722 || opt_arg(arg, 'U', "unified", &options->context))
3723 enable_patch_output(&options->output_format);
3724 else if (!strcmp(arg, "--raw"))
3725 options->output_format |= DIFF_FORMAT_RAW;
3726 else if (!strcmp(arg, "--patch-with-raw")) {
3727 enable_patch_output(&options->output_format);
3728 options->output_format |= DIFF_FORMAT_RAW;
3729 } else if (!strcmp(arg, "--numstat"))
3730 options->output_format |= DIFF_FORMAT_NUMSTAT;
3731 else if (!strcmp(arg, "--shortstat"))
3732 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3733 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3734 return parse_dirstat_opt(options, "");
3735 else if (skip_prefix(arg, "-X", &arg))
3736 return parse_dirstat_opt(options, arg);
3737 else if (skip_prefix(arg, "--dirstat=", &arg))
3738 return parse_dirstat_opt(options, arg);
3739 else if (!strcmp(arg, "--cumulative"))
3740 return parse_dirstat_opt(options, "cumulative");
3741 else if (!strcmp(arg, "--dirstat-by-file"))
3742 return parse_dirstat_opt(options, "files");
3743 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3744 parse_dirstat_opt(options, "files");
3745 return parse_dirstat_opt(options, arg);
3746 }
3747 else if (!strcmp(arg, "--check"))
3748 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3749 else if (!strcmp(arg, "--summary"))
3750 options->output_format |= DIFF_FORMAT_SUMMARY;
3751 else if (!strcmp(arg, "--patch-with-stat")) {
3752 enable_patch_output(&options->output_format);
3753 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3754 } else if (!strcmp(arg, "--name-only"))
3755 options->output_format |= DIFF_FORMAT_NAME;
3756 else if (!strcmp(arg, "--name-status"))
3757 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3758 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3759 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3760 else if (starts_with(arg, "--stat"))
3761 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3762 return stat_opt(options, av);
3763 /* renames options */
3765 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3766 !strcmp(arg, "--break-rewrites")) {
3767 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3768 return error("invalid argument to -B: %s", arg+2);
3769 }
3770 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3771 !strcmp(arg, "--find-renames")) {
3772 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3773 return error("invalid argument to -M: %s", arg+2);
3774 options->detect_rename = DIFF_DETECT_RENAME;
3775 }
3776 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3777 options->irreversible_delete = 1;
3778 }
3779 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3780 !strcmp(arg, "--find-copies")) {
3781 if (options->detect_rename == DIFF_DETECT_COPY)
3782 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3783 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3784 return error("invalid argument to -C: %s", arg+2);
3785 options->detect_rename = DIFF_DETECT_COPY;
3786 }
3787 else if (!strcmp(arg, "--no-renames"))
3788 options->detect_rename = 0;
3789 else if (!strcmp(arg, "--rename-empty"))
3790 DIFF_OPT_SET(options, RENAME_EMPTY);
3791 else if (!strcmp(arg, "--no-rename-empty"))
3792 DIFF_OPT_CLR(options, RENAME_EMPTY);
3793 else if (!strcmp(arg, "--relative"))
3794 DIFF_OPT_SET(options, RELATIVE_NAME);
3795 else if (skip_prefix(arg, "--relative=", &arg)) {
3796 DIFF_OPT_SET(options, RELATIVE_NAME);
3797 options->prefix = arg;
3798 }
3799 /* xdiff options */
3801 else if (!strcmp(arg, "--minimal"))
3802 DIFF_XDL_SET(options, NEED_MINIMAL);
3803 else if (!strcmp(arg, "--no-minimal"))
3804 DIFF_XDL_CLR(options, NEED_MINIMAL);
3805 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3806 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3807 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3808 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3809 else if (!strcmp(arg, "--ignore-space-at-eol"))
3810 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3811 else if (!strcmp(arg, "--ignore-blank-lines"))
3812 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3813 else if (!strcmp(arg, "--patience"))
3814 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3815 else if (!strcmp(arg, "--histogram"))
3816 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3817 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3818 long value = parse_algorithm_value(optarg);
3819 if (value < 0)
3820 return error("option diff-algorithm accepts \"myers\", "
3821 "\"minimal\", \"patience\" and \"histogram\"");
3822 /* clear out previous settings */
3823 DIFF_XDL_CLR(options, NEED_MINIMAL);
3824 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3825 options->xdl_opts |= value;
3826 return argcount;
3827 }
3828 /* flags options */
3830 else if (!strcmp(arg, "--binary")) {
3831 enable_patch_output(&options->output_format);
3832 DIFF_OPT_SET(options, BINARY);
3833 }
3834 else if (!strcmp(arg, "--full-index"))
3835 DIFF_OPT_SET(options, FULL_INDEX);
3836 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3837 DIFF_OPT_SET(options, TEXT);
3838 else if (!strcmp(arg, "-R"))
3839 DIFF_OPT_SET(options, REVERSE_DIFF);
3840 else if (!strcmp(arg, "--find-copies-harder"))
3841 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3842 else if (!strcmp(arg, "--follow"))
3843 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3844 else if (!strcmp(arg, "--no-follow")) {
3845 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3846 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
3847 } else if (!strcmp(arg, "--color"))
3848 options->use_color = 1;
3849 else if (skip_prefix(arg, "--color=", &arg)) {
3850 int value = git_config_colorbool(NULL, arg);
3851 if (value < 0)
3852 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3853 options->use_color = value;
3854 }
3855 else if (!strcmp(arg, "--no-color"))
3856 options->use_color = 0;
3857 else if (!strcmp(arg, "--color-words")) {
3858 options->use_color = 1;
3859 options->word_diff = DIFF_WORDS_COLOR;
3860 }
3861 else if (skip_prefix(arg, "--color-words=", &arg)) {
3862 options->use_color = 1;
3863 options->word_diff = DIFF_WORDS_COLOR;
3864 options->word_regex = arg;
3865 }
3866 else if (!strcmp(arg, "--word-diff")) {
3867 if (options->word_diff == DIFF_WORDS_NONE)
3868 options->word_diff = DIFF_WORDS_PLAIN;
3869 }
3870 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3871 if (!strcmp(arg, "plain"))
3872 options->word_diff = DIFF_WORDS_PLAIN;
3873 else if (!strcmp(arg, "color")) {
3874 options->use_color = 1;
3875 options->word_diff = DIFF_WORDS_COLOR;
3876 }
3877 else if (!strcmp(arg, "porcelain"))
3878 options->word_diff = DIFF_WORDS_PORCELAIN;
3879 else if (!strcmp(arg, "none"))
3880 options->word_diff = DIFF_WORDS_NONE;
3881 else
3882 die("bad --word-diff argument: %s", arg);
3883 }
3884 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3885 if (options->word_diff == DIFF_WORDS_NONE)
3886 options->word_diff = DIFF_WORDS_PLAIN;
3887 options->word_regex = optarg;
3888 return argcount;
3889 }
3890 else if (!strcmp(arg, "--exit-code"))
3891 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3892 else if (!strcmp(arg, "--quiet"))
3893 DIFF_OPT_SET(options, QUICK);
3894 else if (!strcmp(arg, "--ext-diff"))
3895 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3896 else if (!strcmp(arg, "--no-ext-diff"))
3897 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3898 else if (!strcmp(arg, "--textconv"))
3899 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3900 else if (!strcmp(arg, "--no-textconv"))
3901 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3902 else if (!strcmp(arg, "--ignore-submodules")) {
3903 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3904 handle_ignore_submodules_arg(options, "all");
3905 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3906 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3907 handle_ignore_submodules_arg(options, arg);
3908 } else if (!strcmp(arg, "--submodule"))
3909 DIFF_OPT_SET(options, SUBMODULE_LOG);
3910 else if (skip_prefix(arg, "--submodule=", &arg))
3911 return parse_submodule_opt(options, arg);
3912 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
3913 return parse_ws_error_highlight(options, arg);
3914 /* misc options */
3916 else if (!strcmp(arg, "-z"))
3917 options->line_termination = 0;
3918 else if ((argcount = short_opt('l', av, &optarg))) {
3919 options->rename_limit = strtoul(optarg, NULL, 10);
3920 return argcount;
3921 }
3922 else if ((argcount = short_opt('S', av, &optarg))) {
3923 options->pickaxe = optarg;
3924 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3925 return argcount;
3926 } else if ((argcount = short_opt('G', av, &optarg))) {
3927 options->pickaxe = optarg;
3928 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3929 return argcount;
3930 }
3931 else if (!strcmp(arg, "--pickaxe-all"))
3932 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3933 else if (!strcmp(arg, "--pickaxe-regex"))
3934 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3935 else if ((argcount = short_opt('O', av, &optarg))) {
3936 const char *path = prefix_filename(prefix, strlen(prefix), optarg);
3937 options->orderfile = xstrdup(path);
3938 return argcount;
3939 }
3940 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3941 int offending = parse_diff_filter_opt(optarg, options);
3942 if (offending)
3943 die("unknown change class '%c' in --diff-filter=%s",
3944 offending, optarg);
3945 return argcount;
3946 }
3947 else if (!strcmp(arg, "--abbrev"))
3948 options->abbrev = DEFAULT_ABBREV;
3949 else if (skip_prefix(arg, "--abbrev=", &arg)) {
3950 options->abbrev = strtoul(arg, NULL, 10);
3951 if (options->abbrev < MINIMUM_ABBREV)
3952 options->abbrev = MINIMUM_ABBREV;
3953 else if (40 < options->abbrev)
3954 options->abbrev = 40;
3955 }
3956 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3957 options->a_prefix = optarg;
3958 return argcount;
3959 }
3960 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3961 options->b_prefix = optarg;
3962 return argcount;
3963 }
3964 else if (!strcmp(arg, "--no-prefix"))
3965 options->a_prefix = options->b_prefix = "";
3966 else if (opt_arg(arg, '\0', "inter-hunk-context",
3967 &options->interhunkcontext))
3968 ;
3969 else if (!strcmp(arg, "-W"))
3970 DIFF_OPT_SET(options, FUNCCONTEXT);
3971 else if (!strcmp(arg, "--function-context"))
3972 DIFF_OPT_SET(options, FUNCCONTEXT);
3973 else if (!strcmp(arg, "--no-function-context"))
3974 DIFF_OPT_CLR(options, FUNCCONTEXT);
3975 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3976 const char *path = prefix_filename(prefix, strlen(prefix), optarg);
3977 options->file = fopen(path, "w");
3978 if (!options->file)
3979 die_errno("Could not open '%s'", path);
3980 options->close_file = 1;
3981 return argcount;
3982 } else
3983 return 0;
3984 return 1;
3985}
3986int parse_rename_score(const char **cp_p)
3988{
3989 unsigned long num, scale;
3990 int ch, dot;
3991 const char *cp = *cp_p;
3992 num = 0;
3994 scale = 1;
3995 dot = 0;
3996 for (;;) {
3997 ch = *cp;
3998 if ( !dot && ch == '.' ) {
3999 scale = 1;
4000 dot = 1;
4001 } else if ( ch == '%' ) {
4002 scale = dot ? scale*100 : 100;
4003 cp++; /* % is always at the end */
4004 break;
4005 } else if ( ch >= '0' && ch <= '9' ) {
4006 if ( scale < 100000 ) {
4007 scale *= 10;
4008 num = (num*10) + (ch-'0');
4009 }
4010 } else {
4011 break;
4012 }
4013 cp++;
4014 }
4015 *cp_p = cp;
4016 /* user says num divided by scale and we say internally that
4018 * is MAX_SCORE * num / scale.
4019 */
4020 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
4021}
4022static int diff_scoreopt_parse(const char *opt)
4024{
4025 int opt1, opt2, cmd;
4026 if (*opt++ != '-')
4028 return -1;
4029 cmd = *opt++;
4030 if (cmd == '-') {
4031 /* convert the long-form arguments into short-form versions */
4032 if (skip_prefix(opt, "break-rewrites", &opt)) {
4033 if (*opt == 0 || *opt++ == '=')
4034 cmd = 'B';
4035 } else if (skip_prefix(opt, "find-copies", &opt)) {
4036 if (*opt == 0 || *opt++ == '=')
4037 cmd = 'C';
4038 } else if (skip_prefix(opt, "find-renames", &opt)) {
4039 if (*opt == 0 || *opt++ == '=')
4040 cmd = 'M';
4041 }
4042 }
4043 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4044 return -1; /* that is not a -M, -C, or -B option */
4045 opt1 = parse_rename_score(&opt);
4047 if (cmd != 'B')
4048 opt2 = 0;
4049 else {
4050 if (*opt == 0)
4051 opt2 = 0;
4052 else if (*opt != '/')
4053 return -1; /* we expect -B80/99 or -B80 */
4054 else {
4055 opt++;
4056 opt2 = parse_rename_score(&opt);
4057 }
4058 }
4059 if (*opt != 0)
4060 return -1;
4061 return opt1 | (opt2 << 16);
4062}
4063struct diff_queue_struct diff_queued_diff;
4065void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4067{
4068 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4069 queue->queue[queue->nr++] = dp;
4070}
4071struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4073 struct diff_filespec *one,
4074 struct diff_filespec *two)
4075{
4076 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4077 dp->one = one;
4078 dp->two = two;
4079 if (queue)
4080 diff_q(queue, dp);
4081 return dp;
4082}
4083void diff_free_filepair(struct diff_filepair *p)
4085{
4086 free_filespec(p->one);
4087 free_filespec(p->two);
4088 free(p);
4089}
4090/* This is different from find_unique_abbrev() in that
4092 * it stuffs the result with dots for alignment.
4093 */
4094const char *diff_unique_abbrev(const unsigned char *sha1, int len)
4095{
4096 int abblen;
4097 const char *abbrev;
4098 if (len == 40)
4099 return sha1_to_hex(sha1);
4100 abbrev = find_unique_abbrev(sha1, len);
4102 abblen = strlen(abbrev);
4103 if (abblen < 37) {
4104 static char hex[41];
4105 if (len < abblen && abblen <= len + 2)
4106 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
4107 else
4108 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
4109 return hex;
4110 }
4111 return sha1_to_hex(sha1);
4112}
4113static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4115{
4116 int line_termination = opt->line_termination;
4117 int inter_name_termination = line_termination ? '\t' : '\0';
4118 fprintf(opt->file, "%s", diff_line_prefix(opt));
4120 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4121 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4122 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4123 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4124 }
4125 if (p->score) {
4126 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4127 inter_name_termination);
4128 } else {
4129 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4130 }
4131 if (p->status == DIFF_STATUS_COPIED ||
4133 p->status == DIFF_STATUS_RENAMED) {
4134 const char *name_a, *name_b;
4135 name_a = p->one->path;
4136 name_b = p->two->path;
4137 strip_prefix(opt->prefix_length, &name_a, &name_b);
4138 write_name_quoted(name_a, opt->file, inter_name_termination);
4139 write_name_quoted(name_b, opt->file, line_termination);
4140 } else {
4141 const char *name_a, *name_b;
4142 name_a = p->one->mode ? p->one->path : p->two->path;
4143 name_b = NULL;
4144 strip_prefix(opt->prefix_length, &name_a, &name_b);
4145 write_name_quoted(name_a, opt->file, line_termination);
4146 }
4147}
4148int diff_unmodified_pair(struct diff_filepair *p)
4150{
4151 /* This function is written stricter than necessary to support
4152 * the currently implemented transformers, but the idea is to
4153 * let transformers to produce diff_filepairs any way they want,
4154 * and filter and clean them up here before producing the output.
4155 */
4156 struct diff_filespec *one = p->one, *two = p->two;
4157 if (DIFF_PAIR_UNMERGED(p))
4159 return 0; /* unmerged is interesting */
4160 /* deletion, addition, mode or type change
4162 * and rename are all interesting.
4163 */
4164 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4165 DIFF_PAIR_MODE_CHANGED(p) ||
4166 strcmp(one->path, two->path))
4167 return 0;
4168 /* both are valid and point at the same path. that is, we are
4170 * dealing with a change.
4171 */
4172 if (one->sha1_valid && two->sha1_valid &&
4173 !hashcmp(one->sha1, two->sha1) &&
4174 !one->dirty_submodule && !two->dirty_submodule)
4175 return 1; /* no change */
4176 if (!one->sha1_valid && !two->sha1_valid)
4177 return 1; /* both look at the same file on the filesystem. */
4178 return 0;
4179}
4180static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4182{
4183 if (diff_unmodified_pair(p))
4184 return;
4185 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4187 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4188 return; /* no tree diffs in patch format */
4189 run_diff(p, o);
4191}
4192static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4194 struct diffstat_t *diffstat)
4195{
4196 if (diff_unmodified_pair(p))
4197 return;
4198 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4200 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4201 return; /* no useful stat for tree diffs */
4202 run_diffstat(p, o, diffstat);
4204}
4205static void diff_flush_checkdiff(struct diff_filepair *p,
4207 struct diff_options *o)
4208{
4209 if (diff_unmodified_pair(p))
4210 return;
4211 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4213 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4214 return; /* nothing to check in tree diffs */
4215 run_checkdiff(p, o);
4217}
4218int diff_queue_is_empty(void)
4220{
4221 struct diff_queue_struct *q = &diff_queued_diff;
4222 int i;
4223 for (i = 0; i < q->nr; i++)
4224 if (!diff_unmodified_pair(q->queue[i]))
4225 return 0;
4226 return 1;
4227}
4228#if DIFF_DEBUG
4230void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4231{
4232 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4233 x, one ? one : "",
4234 s->path,
4235 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4236 s->mode,
4237 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4238 fprintf(stderr, "queue[%d] %s size %lu\n",
4239 x, one ? one : "",
4240 s->size);
4241}
4242void diff_debug_filepair(const struct diff_filepair *p, int i)
4244{
4245 diff_debug_filespec(p->one, i, "one");
4246 diff_debug_filespec(p->two, i, "two");
4247 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4248 p->score, p->status ? p->status : '?',
4249 p->one->rename_used, p->broken_pair);
4250}
4251void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4253{
4254 int i;
4255 if (msg)
4256 fprintf(stderr, "%s\n", msg);
4257 fprintf(stderr, "q->nr = %d\n", q->nr);
4258 for (i = 0; i < q->nr; i++) {
4259 struct diff_filepair *p = q->queue[i];
4260 diff_debug_filepair(p, i);
4261 }
4262}
4263#endif
4264static void diff_resolve_rename_copy(void)
4266{
4267 int i;
4268 struct diff_filepair *p;
4269 struct diff_queue_struct *q = &diff_queued_diff;
4270 diff_debug_queue("resolve-rename-copy", q);
4272 for (i = 0; i < q->nr; i++) {
4274 p = q->queue[i];
4275 p->status = 0; /* undecided */
4276 if (DIFF_PAIR_UNMERGED(p))
4277 p->status = DIFF_STATUS_UNMERGED;
4278 else if (!DIFF_FILE_VALID(p->one))
4279 p->status = DIFF_STATUS_ADDED;
4280 else if (!DIFF_FILE_VALID(p->two))
4281 p->status = DIFF_STATUS_DELETED;
4282 else if (DIFF_PAIR_TYPE_CHANGED(p))
4283 p->status = DIFF_STATUS_TYPE_CHANGED;
4284 /* from this point on, we are dealing with a pair
4286 * whose both sides are valid and of the same type, i.e.
4287 * either in-place edit or rename/copy edit.
4288 */
4289 else if (DIFF_PAIR_RENAME(p)) {
4290 /*
4291 * A rename might have re-connected a broken
4292 * pair up, causing the pathnames to be the
4293 * same again. If so, that's not a rename at
4294 * all, just a modification..
4295 *
4296 * Otherwise, see if this source was used for
4297 * multiple renames, in which case we decrement
4298 * the count, and call it a copy.
4299 */
4300 if (!strcmp(p->one->path, p->two->path))
4301 p->status = DIFF_STATUS_MODIFIED;
4302 else if (--p->one->rename_used > 0)
4303 p->status = DIFF_STATUS_COPIED;
4304 else
4305 p->status = DIFF_STATUS_RENAMED;
4306 }
4307 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4308 p->one->mode != p->two->mode ||
4309 p->one->dirty_submodule ||
4310 p->two->dirty_submodule ||
4311 is_null_sha1(p->one->sha1))
4312 p->status = DIFF_STATUS_MODIFIED;
4313 else {
4314 /* This is a "no-change" entry and should not
4315 * happen anymore, but prepare for broken callers.
4316 */
4317 error("feeding unmodified %s to diffcore",
4318 p->one->path);
4319 p->status = DIFF_STATUS_UNKNOWN;
4320 }
4321 }
4322 diff_debug_queue("resolve-rename-copy done", q);
4323}
4324static int check_pair_status(struct diff_filepair *p)
4326{
4327 switch (p->status) {
4328 case DIFF_STATUS_UNKNOWN:
4329 return 0;
4330 case 0:
4331 die("internal error in diff-resolve-rename-copy");
4332 default:
4333 return 1;
4334 }
4335}
4336static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4338{
4339 int fmt = opt->output_format;
4340 if (fmt & DIFF_FORMAT_CHECKDIFF)
4342 diff_flush_checkdiff(p, opt);
4343 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4344 diff_flush_raw(p, opt);
4345 else if (fmt & DIFF_FORMAT_NAME) {
4346 const char *name_a, *name_b;
4347 name_a = p->two->path;
4348 name_b = NULL;
4349 strip_prefix(opt->prefix_length, &name_a, &name_b);
4350 write_name_quoted(name_a, opt->file, opt->line_termination);
4351 }
4352}
4353static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4355{
4356 if (fs->mode)
4357 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4358 else
4359 fprintf(file, " %s ", newdelete);
4360 write_name_quoted(fs->path, file, '\n');
4361}
4362static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4365 const char *line_prefix)
4366{
4367 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4368 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4369 p->two->mode, show_name ? ' ' : '\n');
4370 if (show_name) {
4371 write_name_quoted(p->two->path, file, '\n');
4372 }
4373 }
4374}
4375static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4377 const char *line_prefix)
4378{
4379 char *names = pprint_rename(p->one->path, p->two->path);
4380 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4382 free(names);
4383 show_mode_change(file, p, 0, line_prefix);
4384}
4385static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4387{
4388 FILE *file = opt->file;
4389 const char *line_prefix = diff_line_prefix(opt);
4390 switch(p->status) {
4392 case DIFF_STATUS_DELETED:
4393 fputs(line_prefix, file);
4394 show_file_mode_name(file, "delete", p->one);
4395 break;
4396 case DIFF_STATUS_ADDED:
4397 fputs(line_prefix, file);
4398 show_file_mode_name(file, "create", p->two);
4399 break;
4400 case DIFF_STATUS_COPIED:
4401 fputs(line_prefix, file);
4402 show_rename_copy(file, "copy", p, line_prefix);
4403 break;
4404 case DIFF_STATUS_RENAMED:
4405 fputs(line_prefix, file);
4406 show_rename_copy(file, "rename", p, line_prefix);
4407 break;
4408 default:
4409 if (p->score) {
4410 fprintf(file, "%s rewrite ", line_prefix);
4411 write_name_quoted(p->two->path, file, ' ');
4412 fprintf(file, "(%d%%)\n", similarity_index(p));
4413 }
4414 show_mode_change(file, p, !p->score, line_prefix);
4415 break;
4416 }
4417}
4418struct patch_id_t {
4420 git_SHA_CTX *ctx;
4421 int patchlen;
4422};
4423static int remove_space(char *line, int len)
4425{
4426 int i;
4427 char *dst = line;
4428 unsigned char c;
4429 for (i = 0; i < len; i++)
4431 if (!isspace((c = line[i])))
4432 *dst++ = c;
4433 return dst - line;
4435}
4436static void patch_id_consume(void *priv, char *line, unsigned long len)
4438{
4439 struct patch_id_t *data = priv;
4440 int new_len;
4441 /* Ignore line numbers when computing the SHA1 of the patch */
4443 if (starts_with(line, "@@ -"))
4444 return;
4445 new_len = remove_space(line, len);
4447 git_SHA1_Update(data->ctx, line, new_len);
4449 data->patchlen += new_len;
4450}
4451/* returns 0 upon success, and writes result into sha1 */
4453static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4454{
4455 struct diff_queue_struct *q = &diff_queued_diff;
4456 int i;
4457 git_SHA_CTX ctx;
4458 struct patch_id_t data;
4459 char buffer[PATH_MAX * 4 + 20];
4460 git_SHA1_Init(&ctx);
4462 memset(&data, 0, sizeof(struct patch_id_t));
4463 data.ctx = &ctx;
4464 for (i = 0; i < q->nr; i++) {
4466 xpparam_t xpp;
4467 xdemitconf_t xecfg;
4468 mmfile_t mf1, mf2;
4469 struct diff_filepair *p = q->queue[i];
4470 int len1, len2;
4471 memset(&xpp, 0, sizeof(xpp));
4473 memset(&xecfg, 0, sizeof(xecfg));
4474 if (p->status == 0)
4475 return error("internal diff status error");
4476 if (p->status == DIFF_STATUS_UNKNOWN)
4477 continue;
4478 if (diff_unmodified_pair(p))
4479 continue;
4480 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4481 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4482 continue;
4483 if (DIFF_PAIR_UNMERGED(p))
4484 continue;
4485 diff_fill_sha1_info(p->one);
4487 diff_fill_sha1_info(p->two);
4488 if (fill_mmfile(&mf1, p->one) < 0 ||
4489 fill_mmfile(&mf2, p->two) < 0)
4490 return error("unable to read files to diff");
4491 len1 = remove_space(p->one->path, strlen(p->one->path));
4493 len2 = remove_space(p->two->path, strlen(p->two->path));
4494 if (p->one->mode == 0)
4495 len1 = snprintf(buffer, sizeof(buffer),
4496 "diff--gita/%.*sb/%.*s"
4497 "newfilemode%06o"
4498 "---/dev/null"
4499 "+++b/%.*s",
4500 len1, p->one->path,
4501 len2, p->two->path,
4502 p->two->mode,
4503 len2, p->two->path);
4504 else if (p->two->mode == 0)
4505 len1 = snprintf(buffer, sizeof(buffer),
4506 "diff--gita/%.*sb/%.*s"
4507 "deletedfilemode%06o"
4508 "---a/%.*s"
4509 "+++/dev/null",
4510 len1, p->one->path,
4511 len2, p->two->path,
4512 p->one->mode,
4513 len1, p->one->path);
4514 else
4515 len1 = snprintf(buffer, sizeof(buffer),
4516 "diff--gita/%.*sb/%.*s"
4517 "---a/%.*s"
4518 "+++b/%.*s",
4519 len1, p->one->path,
4520 len2, p->two->path,
4521 len1, p->one->path,
4522 len2, p->two->path);
4523 git_SHA1_Update(&ctx, buffer, len1);
4524 if (diff_filespec_is_binary(p->one) ||
4526 diff_filespec_is_binary(p->two)) {
4527 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4528 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4529 continue;
4530 }
4531 xpp.flags = 0;
4533 xecfg.ctxlen = 3;
4534 xecfg.flags = 0;
4535 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4536 &xpp, &xecfg))
4537 return error("unable to generate patch-id diff for %s",
4538 p->one->path);
4539 }
4540 git_SHA1_Final(sha1, &ctx);
4542 return 0;
4543}
4544int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4546{
4547 struct diff_queue_struct *q = &diff_queued_diff;
4548 int i;
4549 int result = diff_get_patch_id(options, sha1);
4550 for (i = 0; i < q->nr; i++)
4552 diff_free_filepair(q->queue[i]);
4553 free(q->queue);
4555 DIFF_QUEUE_CLEAR(q);
4556 return result;
4558}
4559static int is_summary_empty(const struct diff_queue_struct *q)
4561{
4562 int i;
4563 for (i = 0; i < q->nr; i++) {
4565 const struct diff_filepair *p = q->queue[i];
4566 switch (p->status) {
4568 case DIFF_STATUS_DELETED:
4569 case DIFF_STATUS_ADDED:
4570 case DIFF_STATUS_COPIED:
4571 case DIFF_STATUS_RENAMED:
4572 return 0;
4573 default:
4574 if (p->score)
4575 return 0;
4576 if (p->one->mode && p->two->mode &&
4577 p->one->mode != p->two->mode)
4578 return 0;
4579 break;
4580 }
4581 }
4582 return 1;
4583}
4584static const char rename_limit_warning[] =
4586"inexact rename detection was skipped due to too many files.";
4587static const char degrade_cc_to_c_warning[] =
4589"only found copies from modified paths due to too many files.";
4590static const char rename_limit_advice[] =
4592"you may want to set your %s variable to at least "
4593"%d and retry the command.";
4594void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4596{
4597 if (degraded_cc)
4598 warning(degrade_cc_to_c_warning);
4599 else if (needed)
4600 warning(rename_limit_warning);
4601 else
4602 return;
4603 if (0 < needed && needed < 32767)
4604 warning(rename_limit_advice, varname, needed);
4605}
4606void diff_flush(struct diff_options *options)
4608{
4609 struct diff_queue_struct *q = &diff_queued_diff;
4610 int i, output_format = options->output_format;
4611 int separator = 0;
4612 int dirstat_by_line = 0;
4613 /*
4615 * Order: raw, stat, summary, patch
4616 * or: name/name-status/checkdiff (other bits clear)
4617 */
4618 if (!q->nr)
4619 goto free_queue;
4620 if (output_format & (DIFF_FORMAT_RAW |
4622 DIFF_FORMAT_NAME |
4623 DIFF_FORMAT_NAME_STATUS |
4624 DIFF_FORMAT_CHECKDIFF)) {
4625 for (i = 0; i < q->nr; i++) {
4626 struct diff_filepair *p = q->queue[i];
4627 if (check_pair_status(p))
4628 flush_one_pair(p, options);
4629 }
4630 separator++;
4631 }
4632 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4634 dirstat_by_line = 1;
4635 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4637 dirstat_by_line) {
4638 struct diffstat_t diffstat;
4639 memset(&diffstat, 0, sizeof(struct diffstat_t));
4641 for (i = 0; i < q->nr; i++) {
4642 struct diff_filepair *p = q->queue[i];
4643 if (check_pair_status(p))
4644 diff_flush_stat(p, options, &diffstat);
4645 }
4646 if (output_format & DIFF_FORMAT_NUMSTAT)
4647 show_numstat(&diffstat, options);
4648 if (output_format & DIFF_FORMAT_DIFFSTAT)
4649 show_stats(&diffstat, options);
4650 if (output_format & DIFF_FORMAT_SHORTSTAT)
4651 show_shortstats(&diffstat, options);
4652 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
4653 show_dirstat_by_line(&diffstat, options);
4654 free_diffstat_info(&diffstat);
4655 separator++;
4656 }
4657 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4658 show_dirstat(options);
4659 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4661 for (i = 0; i < q->nr; i++) {
4662 diff_summary(options, q->queue[i]);
4663 }
4664 separator++;
4665 }
4666 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4668 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4669 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4670 /*
4671 * run diff_flush_patch for the exit status. setting
4672 * options->file to /dev/null should be safe, because we
4673 * aren't supposed to produce any output anyway.
4674 */
4675 if (options->close_file)
4676 fclose(options->file);
4677 options->file = fopen("/dev/null", "w");
4678 if (!options->file)
4679 die_errno("Could not open /dev/null");
4680 options->close_file = 1;
4681 for (i = 0; i < q->nr; i++) {
4682 struct diff_filepair *p = q->queue[i];
4683 if (check_pair_status(p))
4684 diff_flush_patch(p, options);
4685 if (options->found_changes)
4686 break;
4687 }
4688 }
4689 if (output_format & DIFF_FORMAT_PATCH) {
4691 if (separator) {
4692 fprintf(options->file, "%s%c",
4693 diff_line_prefix(options),
4694 options->line_termination);
4695 if (options->stat_sep) {
4696 /* attach patch instead of inline */
4697 fputs(options->stat_sep, options->file);
4698 }
4699 }
4700 for (i = 0; i < q->nr; i++) {
4702 struct diff_filepair *p = q->queue[i];
4703 if (check_pair_status(p))
4704 diff_flush_patch(p, options);
4705 }
4706 }
4707 if (output_format & DIFF_FORMAT_CALLBACK)
4709 options->format_callback(q, options, options->format_callback_data);
4710 for (i = 0; i < q->nr; i++)
4712 diff_free_filepair(q->queue[i]);
4713free_queue:
4714 free(q->queue);
4715 DIFF_QUEUE_CLEAR(q);
4716 if (options->close_file)
4717 fclose(options->file);
4718 /*
4720 * Report the content-level differences with HAS_CHANGES;
4721 * diff_addremove/diff_change does not set the bit when
4722 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4723 */
4724 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4725 if (options->found_changes)
4726 DIFF_OPT_SET(options, HAS_CHANGES);
4727 else
4728 DIFF_OPT_CLR(options, HAS_CHANGES);
4729 }
4730}
4731static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4733{
4734 return (((p->status == DIFF_STATUS_MODIFIED) &&
4735 ((p->score &&
4736 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4737 (!p->score &&
4738 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4739 ((p->status != DIFF_STATUS_MODIFIED) &&
4740 filter_bit_tst(p->status, options)));
4741}
4742static void diffcore_apply_filter(struct diff_options *options)
4744{
4745 int i;
4746 struct diff_queue_struct *q = &diff_queued_diff;
4747 struct diff_queue_struct outq;
4748 DIFF_QUEUE_CLEAR(&outq);
4750 if (!options->filter)
4752 return;
4753 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4755 int found;
4756 for (i = found = 0; !found && i < q->nr; i++) {
4757 if (match_filter(options, q->queue[i]))
4758 found++;
4759 }
4760 if (found)
4761 return;
4762 /* otherwise we will clear the whole queue
4764 * by copying the empty outq at the end of this
4765 * function, but first clear the current entries
4766 * in the queue.
4767 */
4768 for (i = 0; i < q->nr; i++)
4769 diff_free_filepair(q->queue[i]);
4770 }
4771 else {
4772 /* Only the matching ones */
4773 for (i = 0; i < q->nr; i++) {
4774 struct diff_filepair *p = q->queue[i];
4775 if (match_filter(options, p))
4776 diff_q(&outq, p);
4777 else
4778 diff_free_filepair(p);
4779 }
4780 }
4781 free(q->queue);
4782 *q = outq;
4783}
4784/* Check whether two filespecs with the same mode and size are identical */
4786static int diff_filespec_is_identical(struct diff_filespec *one,
4787 struct diff_filespec *two)
4788{
4789 if (S_ISGITLINK(one->mode))
4790 return 0;
4791 if (diff_populate_filespec(one, 0))
4792 return 0;
4793 if (diff_populate_filespec(two, 0))
4794 return 0;
4795 return !memcmp(one->data, two->data, one->size);
4796}
4797static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4799{
4800 if (p->done_skip_stat_unmatch)
4801 return p->skip_stat_unmatch_result;
4802 p->done_skip_stat_unmatch = 1;
4804 p->skip_stat_unmatch_result = 0;
4805 /*
4806 * 1. Entries that come from stat info dirtiness
4807 * always have both sides (iow, not create/delete),
4808 * one side of the object name is unknown, with
4809 * the same mode and size. Keep the ones that
4810 * do not match these criteria. They have real
4811 * differences.
4812 *
4813 * 2. At this point, the file is known to be modified,
4814 * with the same mode and size, and the object
4815 * name of one side is unknown. Need to inspect
4816 * the identical contents.
4817 */
4818 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4819 !DIFF_FILE_VALID(p->two) ||
4820 (p->one->sha1_valid && p->two->sha1_valid) ||
4821 (p->one->mode != p->two->mode) ||
4822 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
4823 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
4824 (p->one->size != p->two->size) ||
4825 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4826 p->skip_stat_unmatch_result = 1;
4827 return p->skip_stat_unmatch_result;
4828}
4829static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4831{
4832 int i;
4833 struct diff_queue_struct *q = &diff_queued_diff;
4834 struct diff_queue_struct outq;
4835 DIFF_QUEUE_CLEAR(&outq);
4836 for (i = 0; i < q->nr; i++) {
4838 struct diff_filepair *p = q->queue[i];
4839 if (diff_filespec_check_stat_unmatch(p))
4841 diff_q(&outq, p);
4842 else {
4843 /*
4844 * The caller can subtract 1 from skip_stat_unmatch
4845 * to determine how many paths were dirty only
4846 * due to stat info mismatch.
4847 */
4848 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4849 diffopt->skip_stat_unmatch++;
4850 diff_free_filepair(p);
4851 }
4852 }
4853 free(q->queue);
4854 *q = outq;
4855}
4856static int diffnamecmp(const void *a_, const void *b_)
4858{
4859 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4860 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4861 const char *name_a, *name_b;
4862 name_a = a->one ? a->one->path : a->two->path;
4864 name_b = b->one ? b->one->path : b->two->path;
4865 return strcmp(name_a, name_b);
4866}
4867void diffcore_fix_diff_index(struct diff_options *options)
4869{
4870 struct diff_queue_struct *q = &diff_queued_diff;
4871 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4872}
4873void diffcore_std(struct diff_options *options)
4875{
4876 /* NOTE please keep the following in sync with diff_tree_combined() */
4877 if (options->skip_stat_unmatch)
4878 diffcore_skip_stat_unmatch(options);
4879 if (!options->found_follow) {
4880 /* See try_to_follow_renames() in tree-diff.c */
4881 if (options->break_opt != -1)
4882 diffcore_break(options->break_opt);
4883 if (options->detect_rename)
4884 diffcore_rename(options);
4885 if (options->break_opt != -1)
4886 diffcore_merge_broken();
4887 }
4888 if (options->pickaxe)
4889 diffcore_pickaxe(options);
4890 if (options->orderfile)
4891 diffcore_order(options->orderfile);
4892 if (!options->found_follow)
4893 /* See try_to_follow_renames() in tree-diff.c */
4894 diff_resolve_rename_copy();
4895 diffcore_apply_filter(options);
4896 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4898 DIFF_OPT_SET(options, HAS_CHANGES);
4899 else
4900 DIFF_OPT_CLR(options, HAS_CHANGES);
4901 options->found_follow = 0;
4903}
4904int diff_result_code(struct diff_options *opt, int status)
4906{
4907 int result = 0;
4908 diff_warn_rename_limit("diff.renameLimit",
4910 opt->needed_rename_limit,
4911 opt->degraded_cc_to_c);
4912 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4913 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4914 return status;
4915 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4916 DIFF_OPT_TST(opt, HAS_CHANGES))
4917 result |= 01;
4918 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4919 DIFF_OPT_TST(opt, CHECK_FAILED))
4920 result |= 02;
4921 return result;
4922}
4923int diff_can_quit_early(struct diff_options *opt)
4925{
4926 return (DIFF_OPT_TST(opt, QUICK) &&
4927 !opt->filter &&
4928 DIFF_OPT_TST(opt, HAS_CHANGES));
4929}
4930/*
4932 * Shall changes to this submodule be ignored?
4933 *
4934 * Submodule changes can be configured to be ignored separately for each path,
4935 * but that configuration can be overridden from the command line.
4936 */
4937static int is_submodule_ignored(const char *path, struct diff_options *options)
4938{
4939 int ignored = 0;
4940 unsigned orig_flags = options->flags;
4941 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4942 set_diffopt_flags_from_submodule_config(options, path);
4943 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4944 ignored = 1;
4945 options->flags = orig_flags;
4946 return ignored;
4947}
4948void diff_addremove(struct diff_options *options,
4950 int addremove, unsigned mode,
4951 const unsigned char *sha1,
4952 int sha1_valid,
4953 const char *concatpath, unsigned dirty_submodule)
4954{
4955 struct diff_filespec *one, *two;
4956 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4958 return;
4959 /* This may look odd, but it is a preparation for
4961 * feeding "there are unchanged files which should
4962 * not produce diffs, but when you are doing copy
4963 * detection you would need them, so here they are"
4964 * entries to the diff-core. They will be prefixed
4965 * with something like '=' or '*' (I haven't decided
4966 * which but should not make any difference).
4967 * Feeding the same new and old to diff_change()
4968 * also has the same effect.
4969 * Before the final output happens, they are pruned after
4970 * merged into rename/copy pairs as appropriate.
4971 */
4972 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4973 addremove = (addremove == '+' ? '-' :
4974 addremove == '-' ? '+' : addremove);
4975 if (options->prefix &&
4977 strncmp(concatpath, options->prefix, options->prefix_length))
4978 return;
4979 one = alloc_filespec(concatpath);
4981 two = alloc_filespec(concatpath);
4982 if (addremove != '+')
4984 fill_filespec(one, sha1, sha1_valid, mode);
4985 if (addremove != '-') {
4986 fill_filespec(two, sha1, sha1_valid, mode);
4987 two->dirty_submodule = dirty_submodule;
4988 }
4989 diff_queue(&diff_queued_diff, one, two);
4991 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4992 DIFF_OPT_SET(options, HAS_CHANGES);
4993}
4994void diff_change(struct diff_options *options,
4996 unsigned old_mode, unsigned new_mode,
4997 const unsigned char *old_sha1,
4998 const unsigned char *new_sha1,
4999 int old_sha1_valid, int new_sha1_valid,
5000 const char *concatpath,
5001 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
5002{
5003 struct diff_filespec *one, *two;
5004 struct diff_filepair *p;
5005 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
5007 is_submodule_ignored(concatpath, options))
5008 return;
5009 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
5011 unsigned tmp;
5012 const unsigned char *tmp_c;
5013 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
5014 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
5015 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
5016 new_sha1_valid = tmp;
5017 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
5018 new_dirty_submodule = tmp;
5019 }
5020 if (options->prefix &&
5022 strncmp(concatpath, options->prefix, options->prefix_length))
5023 return;
5024 one = alloc_filespec(concatpath);
5026 two = alloc_filespec(concatpath);
5027 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
5028 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
5029 one->dirty_submodule = old_dirty_submodule;
5030 two->dirty_submodule = new_dirty_submodule;
5031 p = diff_queue(&diff_queued_diff, one, two);
5032 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5034 return;
5035 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5037 !diff_filespec_check_stat_unmatch(p))
5038 return;
5039 DIFF_OPT_SET(options, HAS_CHANGES);
5041}
5042struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5044{
5045 struct diff_filepair *pair;
5046 struct diff_filespec *one, *two;
5047 if (options->prefix &&
5049 strncmp(path, options->prefix, options->prefix_length))
5050 return NULL;
5051 one = alloc_filespec(path);
5053 two = alloc_filespec(path);
5054 pair = diff_queue(&diff_queued_diff, one, two);
5055 pair->is_unmerged = 1;
5056 return pair;
5057}
5058static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5060 size_t *outsize)
5061{
5062 struct diff_tempfile *temp;
5063 const char *argv[3];
5064 const char **arg = argv;
5065 struct child_process child = CHILD_PROCESS_INIT;
5066 struct strbuf buf = STRBUF_INIT;
5067 int err = 0;
5068 temp = prepare_temp_file(spec->path, spec);
5070 *arg++ = pgm;
5071 *arg++ = temp->name;
5072 *arg = NULL;
5073 child.use_shell = 1;
5075 child.argv = argv;
5076 child.out = -1;
5077 if (start_command(&child)) {
5078 remove_tempfile();
5079 return NULL;
5080 }
5081 if (strbuf_read(&buf, child.out, 0) < 0)
5083 err = error("error reading from textconv command '%s'", pgm);
5084 close(child.out);
5085 if (finish_command(&child) || err) {
5087 strbuf_release(&buf);
5088 remove_tempfile();
5089 return NULL;
5090 }
5091 remove_tempfile();
5092 return strbuf_detach(&buf, outsize);
5094}
5095size_t fill_textconv(struct userdiff_driver *driver,
5097 struct diff_filespec *df,
5098 char **outbuf)
5099{
5100 size_t size;
5101 if (!driver) {
5103 if (!DIFF_FILE_VALID(df)) {
5104 *outbuf = "";
5105 return 0;
5106 }
5107 if (diff_populate_filespec(df, 0))
5108 die("unable to read files to diff");
5109 *outbuf = df->data;
5110 return df->size;
5111 }
5112 if (!driver->textconv)
5114 die("BUG: fill_textconv called with non-textconv driver");
5115 if (driver->textconv_cache && df->sha1_valid) {
5117 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
5118 &size);
5119 if (*outbuf)
5120 return size;
5121 }
5122 *outbuf = run_textconv(driver->textconv, df, &size);
5124 if (!*outbuf)
5125 die("unable to read files to diff");
5126 if (driver->textconv_cache && df->sha1_valid) {
5128 /* ignore errors, as we might be in a readonly repository */
5129 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5130 size);
5131 /*
5132 * we could save up changes and flush them all at the end,
5133 * but we would need an extra call after all diffing is done.
5134 * Since generating a cache entry is the slow path anyway,
5135 * this extra overhead probably isn't a big deal.
5136 */
5137 notes_cache_write(driver->textconv_cache);
5138 }
5139 return size;
5141}
5142void setup_diff_pager(struct diff_options *opt)
5144{
5145 /*
5146 * If the user asked for our exit code, then either they want --quiet
5147 * or --exit-code. We should definitely not bother with a pager in the
5148 * former case, as we will generate no output. Since we still properly
5149 * report our exit code even when a pager is run, we _could_ run a
5150 * pager with --exit-code. But since we have not done so historically,
5151 * and because it is easy to find people oneline advising "git diff
5152 * --exit-code" in hooks and other scripts, we do not do so.
5153 */
5154 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5155 check_pager_config("diff") != 0)
5156 setup_pager();
5157}