1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4#include "cache.h"
5#include "quote.h"
6#include "diff.h"
7#include "diffcore.h"
8#include "delta.h"
9#include "xdiff-interface.h"
10#include "color.h"
11#include "attr.h"
12#include "run-command.h"
13#include "utf8.h"
14#include "userdiff.h"
15#include "sigchain.h"
16#include "submodule.h"
17#include "ll-merge.h"
18#include "string-list.h"
19#ifdef NO_FAST_WORKING_DIRECTORY
21#define FAST_WORKING_DIRECTORY 0
22#else
23#define FAST_WORKING_DIRECTORY 1
24#endif
25static int diff_detect_rename_default;
27static int diff_rename_limit_default = 400;
28static int diff_suppress_blank_empty;
29static int diff_use_color_default = -1;
30static int diff_context_default = 3;
31static const char *diff_word_regex_cfg;
32static const char *external_diff_cmd_cfg;
33int diff_auto_refresh_index = 1;
34static int diff_mnemonic_prefix;
35static int diff_no_prefix;
36static int diff_stat_graph_width;
37static int diff_dirstat_permille_default = 30;
38static struct diff_options default_diff_options;
39static char diff_colors[][COLOR_MAXLEN] = {
41 GIT_COLOR_RESET,
42 GIT_COLOR_NORMAL, /* PLAIN */
43 GIT_COLOR_BOLD, /* METAINFO */
44 GIT_COLOR_CYAN, /* FRAGINFO */
45 GIT_COLOR_RED, /* OLD */
46 GIT_COLOR_GREEN, /* NEW */
47 GIT_COLOR_YELLOW, /* COMMIT */
48 GIT_COLOR_BG_RED, /* WHITESPACE */
49 GIT_COLOR_NORMAL, /* FUNCINFO */
50};
51static int parse_diff_color_slot(const char *var, int ofs)
53{
54 if (!strcasecmp(var+ofs, "plain"))
55 return DIFF_PLAIN;
56 if (!strcasecmp(var+ofs, "meta"))
57 return DIFF_METAINFO;
58 if (!strcasecmp(var+ofs, "frag"))
59 return DIFF_FRAGINFO;
60 if (!strcasecmp(var+ofs, "old"))
61 return DIFF_FILE_OLD;
62 if (!strcasecmp(var+ofs, "new"))
63 return DIFF_FILE_NEW;
64 if (!strcasecmp(var+ofs, "commit"))
65 return DIFF_COMMIT;
66 if (!strcasecmp(var+ofs, "whitespace"))
67 return DIFF_WHITESPACE;
68 if (!strcasecmp(var+ofs, "func"))
69 return DIFF_FUNCINFO;
70 return -1;
71}
72static int parse_dirstat_params(struct diff_options *options, const char *params_string,
74 struct strbuf *errmsg)
75{
76 char *params_copy = xstrdup(params_string);
77 struct string_list params = STRING_LIST_INIT_NODUP;
78 int ret = 0;
79 int i;
80 if (*params_copy)
82 string_list_split_in_place(¶ms, params_copy, ',', -1);
83 for (i = 0; i < params.nr; i++) {
84 const char *p = params.items[i].string;
85 if (!strcmp(p, "changes")) {
86 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
87 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
88 } else if (!strcmp(p, "lines")) {
89 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
90 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
91 } else if (!strcmp(p, "files")) {
92 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
93 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
94 } else if (!strcmp(p, "noncumulative")) {
95 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
96 } else if (!strcmp(p, "cumulative")) {
97 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
98 } else if (isdigit(*p)) {
99 char *end;
100 int permille = strtoul(p, &end, 10) * 10;
101 if (*end == '.' && isdigit(*++end)) {
102 /* only use first digit */
103 permille += *end - '0';
104 /* .. and ignore any further digits */
105 while (isdigit(*++end))
106 ; /* nothing */
107 }
108 if (!*end)
109 options->dirstat_permille = permille;
110 else {
111 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
112 p);
113 ret++;
114 }
115 } else {
116 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
117 ret++;
118 }
119 }
121 string_list_clear(¶ms, 0);
122 free(params_copy);
123 return ret;
124}
125static int git_config_rename(const char *var, const char *value)
127{
128 if (!value)
129 return DIFF_DETECT_RENAME;
130 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
131 return DIFF_DETECT_COPY;
132 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
133}
134/*
136 * These are to give UI layer defaults.
137 * The core-level commands such as git-diff-files should
138 * never be affected by the setting of diff.renames
139 * the user happens to have in the configuration file.
140 */
141int git_diff_ui_config(const char *var, const char *value, void *cb)
142{
143 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
144 diff_use_color_default = git_config_colorbool(var, value);
145 return 0;
146 }
147 if (!strcmp(var, "diff.context")) {
148 diff_context_default = git_config_int(var, value);
149 if (diff_context_default < 0)
150 return -1;
151 return 0;
152 }
153 if (!strcmp(var, "diff.renames")) {
154 diff_detect_rename_default = git_config_rename(var, value);
155 return 0;
156 }
157 if (!strcmp(var, "diff.autorefreshindex")) {
158 diff_auto_refresh_index = git_config_bool(var, value);
159 return 0;
160 }
161 if (!strcmp(var, "diff.mnemonicprefix")) {
162 diff_mnemonic_prefix = git_config_bool(var, value);
163 return 0;
164 }
165 if (!strcmp(var, "diff.noprefix")) {
166 diff_no_prefix = git_config_bool(var, value);
167 return 0;
168 }
169 if (!strcmp(var, "diff.statgraphwidth")) {
170 diff_stat_graph_width = git_config_int(var, value);
171 return 0;
172 }
173 if (!strcmp(var, "diff.external"))
174 return git_config_string(&external_diff_cmd_cfg, var, value);
175 if (!strcmp(var, "diff.wordregex"))
176 return git_config_string(&diff_word_regex_cfg, var, value);
177 if (!strcmp(var, "diff.ignoresubmodules"))
179 handle_ignore_submodules_arg(&default_diff_options, value);
180 if (git_color_config(var, value, cb) < 0)
182 return -1;
183 return git_diff_basic_config(var, value, cb);
185}
186int git_diff_basic_config(const char *var, const char *value, void *cb)
188{
189 if (!strcmp(var, "diff.renamelimit")) {
190 diff_rename_limit_default = git_config_int(var, value);
191 return 0;
192 }
193 if (userdiff_config(var, value) < 0)
195 return -1;
196 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
198 int slot = parse_diff_color_slot(var, 11);
199 if (slot < 0)
200 return 0;
201 if (!value)
202 return config_error_nonbool(var);
203 color_parse(value, var, diff_colors[slot]);
204 return 0;
205 }
206 /* like GNU diff's --suppress-blank-empty option */
208 if (!strcmp(var, "diff.suppressblankempty") ||
209 /* for backwards compatibility */
210 !strcmp(var, "diff.suppress-blank-empty")) {
211 diff_suppress_blank_empty = git_config_bool(var, value);
212 return 0;
213 }
214 if (!strcmp(var, "diff.dirstat")) {
216 struct strbuf errmsg = STRBUF_INIT;
217 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
218 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
219 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
220 errmsg.buf);
221 strbuf_release(&errmsg);
222 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
223 return 0;
224 }
225 if (!prefixcmp(var, "submodule."))
227 return parse_submodule_config_option(var, value);
228 return git_default_config(var, value, cb);
230}
231static char *quote_two(const char *one, const char *two)
233{
234 int need_one = quote_c_style(one, NULL, NULL, 1);
235 int need_two = quote_c_style(two, NULL, NULL, 1);
236 struct strbuf res = STRBUF_INIT;
237 if (need_one + need_two) {
239 strbuf_addch(&res, '"');
240 quote_c_style(one, &res, NULL, 1);
241 quote_c_style(two, &res, NULL, 1);
242 strbuf_addch(&res, '"');
243 } else {
244 strbuf_addstr(&res, one);
245 strbuf_addstr(&res, two);
246 }
247 return strbuf_detach(&res, NULL);
248}
249static const char *external_diff(void)
251{
252 static const char *external_diff_cmd = NULL;
253 static int done_preparing = 0;
254 if (done_preparing)
256 return external_diff_cmd;
257 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
258 if (!external_diff_cmd)
259 external_diff_cmd = external_diff_cmd_cfg;
260 done_preparing = 1;
261 return external_diff_cmd;
262}
263static struct diff_tempfile {
265 const char *name; /* filename external diff should read from */
266 char hex[41];
267 char mode[10];
268 char tmp_path[PATH_MAX];
269} diff_temp[2];
270typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
272struct emit_callback {
274 int color_diff;
275 unsigned ws_rule;
276 int blank_at_eof_in_preimage;
277 int blank_at_eof_in_postimage;
278 int lno_in_preimage;
279 int lno_in_postimage;
280 sane_truncate_fn truncate;
281 const char **label_path;
282 struct diff_words_data *diff_words;
283 struct diff_options *opt;
284 int *found_changesp;
285 struct strbuf *header;
286};
287static int count_lines(const char *data, int size)
289{
290 int count, ch, completely_empty = 1, nl_just_seen = 0;
291 count = 0;
292 while (0 < size--) {
293 ch = *data++;
294 if (ch == '\n') {
295 count++;
296 nl_just_seen = 1;
297 completely_empty = 0;
298 }
299 else {
300 nl_just_seen = 0;
301 completely_empty = 0;
302 }
303 }
304 if (completely_empty)
305 return 0;
306 if (!nl_just_seen)
307 count++; /* no trailing newline */
308 return count;
309}
310static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
312{
313 if (!DIFF_FILE_VALID(one)) {
314 mf->ptr = (char *)""; /* does not matter */
315 mf->size = 0;
316 return 0;
317 }
318 else if (diff_populate_filespec(one, 0))
319 return -1;
320 mf->ptr = one->data;
322 mf->size = one->size;
323 return 0;
324}
325/* like fill_mmfile, but only for size, so we can avoid retrieving blob */
327static unsigned long diff_filespec_size(struct diff_filespec *one)
328{
329 if (!DIFF_FILE_VALID(one))
330 return 0;
331 diff_populate_filespec(one, 1);
332 return one->size;
333}
334static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
336{
337 char *ptr = mf->ptr;
338 long size = mf->size;
339 int cnt = 0;
340 if (!size)
342 return cnt;
343 ptr += size - 1; /* pointing at the very end */
344 if (*ptr != '\n')
345 ; /* incomplete line */
346 else
347 ptr--; /* skip the last LF */
348 while (mf->ptr < ptr) {
349 char *prev_eol;
350 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
351 if (*prev_eol == '\n')
352 break;
353 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
354 break;
355 cnt++;
356 ptr = prev_eol - 1;
357 }
358 return cnt;
359}
360static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
362 struct emit_callback *ecbdata)
363{
364 int l1, l2, at;
365 unsigned ws_rule = ecbdata->ws_rule;
366 l1 = count_trailing_blank(mf1, ws_rule);
367 l2 = count_trailing_blank(mf2, ws_rule);
368 if (l2 <= l1) {
369 ecbdata->blank_at_eof_in_preimage = 0;
370 ecbdata->blank_at_eof_in_postimage = 0;
371 return;
372 }
373 at = count_lines(mf1->ptr, mf1->size);
374 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
375 at = count_lines(mf2->ptr, mf2->size);
377 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
378}
379static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
381 int first, const char *line, int len)
382{
383 int has_trailing_newline, has_trailing_carriage_return;
384 int nofirst;
385 FILE *file = o->file;
386 if (o->output_prefix) {
388 struct strbuf *msg = NULL;
389 msg = o->output_prefix(o, o->output_prefix_data);
390 assert(msg);
391 fwrite(msg->buf, msg->len, 1, file);
392 }
393 if (len == 0) {
395 has_trailing_newline = (first == '\n');
396 has_trailing_carriage_return = (!has_trailing_newline &&
397 (first == '\r'));
398 nofirst = has_trailing_newline || has_trailing_carriage_return;
399 } else {
400 has_trailing_newline = (len > 0 && line[len-1] == '\n');
401 if (has_trailing_newline)
402 len--;
403 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
404 if (has_trailing_carriage_return)
405 len--;
406 nofirst = 0;
407 }
408 if (len || !nofirst) {
410 fputs(set, file);
411 if (!nofirst)
412 fputc(first, file);
413 fwrite(line, len, 1, file);
414 fputs(reset, file);
415 }
416 if (has_trailing_carriage_return)
417 fputc('\r', file);
418 if (has_trailing_newline)
419 fputc('\n', file);
420}
421static void emit_line(struct diff_options *o, const char *set, const char *reset,
423 const char *line, int len)
424{
425 emit_line_0(o, set, reset, line[0], line+1, len-1);
426}
427static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
429{
430 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
431 ecbdata->blank_at_eof_in_preimage &&
432 ecbdata->blank_at_eof_in_postimage &&
433 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
434 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
435 return 0;
436 return ws_blank_line(line, len, ecbdata->ws_rule);
437}
438static void emit_add_line(const char *reset,
440 struct emit_callback *ecbdata,
441 const char *line, int len)
442{
443 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
444 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
445 if (!*ws)
447 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
448 else if (new_blank_line_at_eof(ecbdata, line, len))
449 /* Blank line at EOF - paint '+' as well */
450 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
451 else {
452 /* Emit just the prefix, then the rest. */
453 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
454 ws_check_emit(line, len, ecbdata->ws_rule,
455 ecbdata->opt->file, set, reset, ws);
456 }
457}
458static void emit_hunk_header(struct emit_callback *ecbdata,
460 const char *line, int len)
461{
462 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
463 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
464 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
465 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
466 static const char atat[2] = { '@', '@' };
467 const char *cp, *ep;
468 struct strbuf msgbuf = STRBUF_INIT;
469 int org_len = len;
470 int i = 1;
471 /*
473 * As a hunk header must begin with "@@ -<old>, +<new> @@",
474 * it always is at least 10 bytes long.
475 */
476 if (len < 10 ||
477 memcmp(line, atat, 2) ||
478 !(ep = memmem(line + 2, len - 2, atat, 2))) {
479 emit_line(ecbdata->opt, plain, reset, line, len);
480 return;
481 }
482 ep += 2; /* skip over @@ */
483 /* The hunk header in fraginfo color */
485 strbuf_add(&msgbuf, frag, strlen(frag));
486 strbuf_add(&msgbuf, line, ep - line);
487 strbuf_add(&msgbuf, reset, strlen(reset));
488 /*
490 * trailing "\r\n"
491 */
492 for ( ; i < 3; i++)
493 if (line[len - i] == '\r' || line[len - i] == '\n')
494 len--;
495 /* blank before the func header */
497 for (cp = ep; ep - line < len; ep++)
498 if (*ep != ' ' && *ep != '\t')
499 break;
500 if (ep != cp) {
501 strbuf_add(&msgbuf, plain, strlen(plain));
502 strbuf_add(&msgbuf, cp, ep - cp);
503 strbuf_add(&msgbuf, reset, strlen(reset));
504 }
505 if (ep < line + len) {
507 strbuf_add(&msgbuf, func, strlen(func));
508 strbuf_add(&msgbuf, ep, line + len - ep);
509 strbuf_add(&msgbuf, reset, strlen(reset));
510 }
511 strbuf_add(&msgbuf, line + len, org_len - len);
513 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
514 strbuf_release(&msgbuf);
515}
516static struct diff_tempfile *claim_diff_tempfile(void) {
518 int i;
519 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
520 if (!diff_temp[i].name)
521 return diff_temp + i;
522 die("BUG: diff is failing to clean up its tempfiles");
523}
524static int remove_tempfile_installed;
526static void remove_tempfile(void)
528{
529 int i;
530 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
531 if (diff_temp[i].name == diff_temp[i].tmp_path)
532 unlink_or_warn(diff_temp[i].name);
533 diff_temp[i].name = NULL;
534 }
535}
536static void remove_tempfile_on_signal(int signo)
538{
539 remove_tempfile();
540 sigchain_pop(signo);
541 raise(signo);
542}
543static void print_line_count(FILE *file, int count)
545{
546 switch (count) {
547 case 0:
548 fprintf(file, "0,0");
549 break;
550 case 1:
551 fprintf(file, "1");
552 break;
553 default:
554 fprintf(file, "1,%d", count);
555 break;
556 }
557}
558static void emit_rewrite_lines(struct emit_callback *ecb,
560 int prefix, const char *data, int size)
561{
562 const char *endp = NULL;
563 static const char *nneof = " No newline at end of file\n";
564 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
565 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
566 while (0 < size) {
568 int len;
569 endp = memchr(data, '\n', size);
571 len = endp ? (endp - data + 1) : size;
572 if (prefix != '+') {
573 ecb->lno_in_preimage++;
574 emit_line_0(ecb->opt, old, reset, '-',
575 data, len);
576 } else {
577 ecb->lno_in_postimage++;
578 emit_add_line(reset, ecb, data, len);
579 }
580 size -= len;
581 data += len;
582 }
583 if (!endp) {
584 const char *plain = diff_get_color(ecb->color_diff,
585 DIFF_PLAIN);
586 putc('\n', ecb->opt->file);
587 emit_line_0(ecb->opt, plain, reset, '\\',
588 nneof, strlen(nneof));
589 }
590}
591static void emit_rewrite_diff(const char *name_a,
593 const char *name_b,
594 struct diff_filespec *one,
595 struct diff_filespec *two,
596 struct userdiff_driver *textconv_one,
597 struct userdiff_driver *textconv_two,
598 struct diff_options *o)
599{
600 int lc_a, lc_b;
601 const char *name_a_tab, *name_b_tab;
602 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
603 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
604 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
605 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
606 const char *a_prefix, *b_prefix;
607 char *data_one, *data_two;
608 size_t size_one, size_two;
609 struct emit_callback ecbdata;
610 char *line_prefix = "";
611 struct strbuf *msgbuf;
612 if (o && o->output_prefix) {
614 msgbuf = o->output_prefix(o, o->output_prefix_data);
615 line_prefix = msgbuf->buf;
616 }
617 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
619 a_prefix = o->b_prefix;
620 b_prefix = o->a_prefix;
621 } else {
622 a_prefix = o->a_prefix;
623 b_prefix = o->b_prefix;
624 }
625 name_a += (*name_a == '/');
627 name_b += (*name_b == '/');
628 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
629 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
630 strbuf_reset(&a_name);
632 strbuf_reset(&b_name);
633 quote_two_c_style(&a_name, a_prefix, name_a, 0);
634 quote_two_c_style(&b_name, b_prefix, name_b, 0);
635 size_one = fill_textconv(textconv_one, one, &data_one);
637 size_two = fill_textconv(textconv_two, two, &data_two);
638 memset(&ecbdata, 0, sizeof(ecbdata));
640 ecbdata.color_diff = want_color(o->use_color);
641 ecbdata.found_changesp = &o->found_changes;
642 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
643 ecbdata.opt = o;
644 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
645 mmfile_t mf1, mf2;
646 mf1.ptr = (char *)data_one;
647 mf2.ptr = (char *)data_two;
648 mf1.size = size_one;
649 mf2.size = size_two;
650 check_blank_at_eof(&mf1, &mf2, &ecbdata);
651 }
652 ecbdata.lno_in_preimage = 1;
653 ecbdata.lno_in_postimage = 1;
654 lc_a = count_lines(data_one, size_one);
656 lc_b = count_lines(data_two, size_two);
657 fprintf(o->file,
658 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
659 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
660 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
661 line_prefix, fraginfo);
662 if (!o->irreversible_delete)
663 print_line_count(o->file, lc_a);
664 else
665 fprintf(o->file, "?,?");
666 fprintf(o->file, " +");
667 print_line_count(o->file, lc_b);
668 fprintf(o->file, " @@%s\n", reset);
669 if (lc_a && !o->irreversible_delete)
670 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
671 if (lc_b)
672 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
673 if (textconv_one)
674 free((char *)data_one);
675 if (textconv_two)
676 free((char *)data_two);
677}
678struct diff_words_buffer {
680 mmfile_t text;
681 long alloc;
682 struct diff_words_orig {
683 const char *begin, *end;
684 } *orig;
685 int orig_nr, orig_alloc;
686};
687static void diff_words_append(char *line, unsigned long len,
689 struct diff_words_buffer *buffer)
690{
691 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
692 line++;
693 len--;
694 memcpy(buffer->text.ptr + buffer->text.size, line, len);
695 buffer->text.size += len;
696 buffer->text.ptr[buffer->text.size] = '\0';
697}
698struct diff_words_style_elem {
700 const char *prefix;
701 const char *suffix;
702 const char *color; /* NULL; filled in by the setup code if
703 * color is enabled */
704};
705struct diff_words_style {
707 enum diff_words_type type;
708 struct diff_words_style_elem new, old, ctx;
709 const char *newline;
710};
711static struct diff_words_style diff_words_styles[] = {
713 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
714 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
715 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
716};
717struct diff_words_data {
719 struct diff_words_buffer minus, plus;
720 const char *current_plus;
721 int last_minus;
722 struct diff_options *opt;
723 regex_t *word_regex;
724 enum diff_words_type type;
725 struct diff_words_style *style;
726};
727static int fn_out_diff_words_write_helper(FILE *fp,
729 struct diff_words_style_elem *st_el,
730 const char *newline,
731 size_t count, const char *buf,
732 const char *line_prefix)
733{
734 int print = 0;
735 while (count) {
737 char *p = memchr(buf, '\n', count);
738 if (print)
739 fputs(line_prefix, fp);
740 if (p != buf) {
741 if (st_el->color && fputs(st_el->color, fp) < 0)
742 return -1;
743 if (fputs(st_el->prefix, fp) < 0 ||
744 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
745 fputs(st_el->suffix, fp) < 0)
746 return -1;
747 if (st_el->color && *st_el->color
748 && fputs(GIT_COLOR_RESET, fp) < 0)
749 return -1;
750 }
751 if (!p)
752 return 0;
753 if (fputs(newline, fp) < 0)
754 return -1;
755 count -= p + 1 - buf;
756 buf = p + 1;
757 print = 1;
758 }
759 return 0;
760}
761/*
763 * '--color-words' algorithm can be described as:
764 *
765 * 1. collect a the minus/plus lines of a diff hunk, divided into
766 * minus-lines and plus-lines;
767 *
768 * 2. break both minus-lines and plus-lines into words and
769 * place them into two mmfile_t with one word for each line;
770 *
771 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
772 *
773 * And for the common parts of the both file, we output the plus side text.
774 * diff_words->current_plus is used to trace the current position of the plus file
775 * which printed. diff_words->last_minus is used to trace the last minus word
776 * printed.
777 *
778 * For '--graph' to work with '--color-words', we need to output the graph prefix
779 * on each line of color words output. Generally, there are two conditions on
780 * which we should output the prefix.
781 *
782 * 1. diff_words->last_minus == 0 &&
783 * diff_words->current_plus == diff_words->plus.text.ptr
784 *
785 * that is: the plus text must start as a new line, and if there is no minus
786 * word printed, a graph prefix must be printed.
787 *
788 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
789 * *(diff_words->current_plus - 1) == '\n'
790 *
791 * that is: a graph prefix must be printed following a '\n'
792 */
793static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
794{
795 if ((diff_words->last_minus == 0 &&
796 diff_words->current_plus == diff_words->plus.text.ptr) ||
797 (diff_words->current_plus > diff_words->plus.text.ptr &&
798 *(diff_words->current_plus - 1) == '\n')) {
799 return 1;
800 } else {
801 return 0;
802 }
803}
804static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
806{
807 struct diff_words_data *diff_words = priv;
808 struct diff_words_style *style = diff_words->style;
809 int minus_first, minus_len, plus_first, plus_len;
810 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
811 struct diff_options *opt = diff_words->opt;
812 struct strbuf *msgbuf;
813 char *line_prefix = "";
814 if (line[0] != '@' || parse_hunk_header(line, len,
816 &minus_first, &minus_len, &plus_first, &plus_len))
817 return;
818 assert(opt);
820 if (opt->output_prefix) {
821 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
822 line_prefix = msgbuf->buf;
823 }
824 /* POSIX requires that first be decremented by one if len == 0... */
826 if (minus_len) {
827 minus_begin = diff_words->minus.orig[minus_first].begin;
828 minus_end =
829 diff_words->minus.orig[minus_first + minus_len - 1].end;
830 } else
831 minus_begin = minus_end =
832 diff_words->minus.orig[minus_first].end;
833 if (plus_len) {
835 plus_begin = diff_words->plus.orig[plus_first].begin;
836 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
837 } else
838 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
839 if (color_words_output_graph_prefix(diff_words)) {
841 fputs(line_prefix, diff_words->opt->file);
842 }
843 if (diff_words->current_plus != plus_begin) {
844 fn_out_diff_words_write_helper(diff_words->opt->file,
845 &style->ctx, style->newline,
846 plus_begin - diff_words->current_plus,
847 diff_words->current_plus, line_prefix);
848 if (*(plus_begin - 1) == '\n')
849 fputs(line_prefix, diff_words->opt->file);
850 }
851 if (minus_begin != minus_end) {
852 fn_out_diff_words_write_helper(diff_words->opt->file,
853 &style->old, style->newline,
854 minus_end - minus_begin, minus_begin,
855 line_prefix);
856 }
857 if (plus_begin != plus_end) {
858 fn_out_diff_words_write_helper(diff_words->opt->file,
859 &style->new, style->newline,
860 plus_end - plus_begin, plus_begin,
861 line_prefix);
862 }
863 diff_words->current_plus = plus_end;
865 diff_words->last_minus = minus_first;
866}
867/* This function starts looking at *begin, and returns 0 iff a word was found. */
869static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
870 int *begin, int *end)
871{
872 if (word_regex && *begin < buffer->size) {
873 regmatch_t match[1];
874 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
875 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
876 '\n', match[0].rm_eo - match[0].rm_so);
877 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
878 *begin += match[0].rm_so;
879 return *begin >= *end;
880 }
881 return -1;
882 }
883 /* find the next word */
885 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
886 (*begin)++;
887 if (*begin >= buffer->size)
888 return -1;
889 /* find the end of the word */
891 *end = *begin + 1;
892 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
893 (*end)++;
894 return 0;
896}
897/*
899 * This function splits the words in buffer->text, stores the list with
900 * newline separator into out, and saves the offsets of the original words
901 * in buffer->orig.
902 */
903static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
904 regex_t *word_regex)
905{
906 int i, j;
907 long alloc = 0;
908 out->size = 0;
910 out->ptr = NULL;
911 /* fake an empty "0th" word */
913 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
914 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
915 buffer->orig_nr = 1;
916 for (i = 0; i < buffer->text.size; i++) {
918 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
919 return;
920 /* store original boundaries */
922 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
923 buffer->orig_alloc);
924 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
925 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
926 buffer->orig_nr++;
927 /* store one word */
929 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
930 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
931 out->ptr[out->size + j - i] = '\n';
932 out->size += j - i + 1;
933 i = j - 1;
935 }
936}
937/* this executes the word diff on the accumulated buffers */
939static void diff_words_show(struct diff_words_data *diff_words)
940{
941 xpparam_t xpp;
942 xdemitconf_t xecfg;
943 mmfile_t minus, plus;
944 struct diff_words_style *style = diff_words->style;
945 struct diff_options *opt = diff_words->opt;
947 struct strbuf *msgbuf;
948 char *line_prefix = "";
949 assert(opt);
951 if (opt->output_prefix) {
952 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
953 line_prefix = msgbuf->buf;
954 }
955 /* special case: only removal */
957 if (!diff_words->plus.text.size) {
958 fputs(line_prefix, diff_words->opt->file);
959 fn_out_diff_words_write_helper(diff_words->opt->file,
960 &style->old, style->newline,
961 diff_words->minus.text.size,
962 diff_words->minus.text.ptr, line_prefix);
963 diff_words->minus.text.size = 0;
964 return;
965 }
966 diff_words->current_plus = diff_words->plus.text.ptr;
968 diff_words->last_minus = 0;
969 memset(&xpp, 0, sizeof(xpp));
971 memset(&xecfg, 0, sizeof(xecfg));
972 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
973 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
974 xpp.flags = 0;
975 /* as only the hunk header will be parsed, we need a 0-context */
976 xecfg.ctxlen = 0;
977 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
978 &xpp, &xecfg);
979 free(minus.ptr);
980 free(plus.ptr);
981 if (diff_words->current_plus != diff_words->plus.text.ptr +
982 diff_words->plus.text.size) {
983 if (color_words_output_graph_prefix(diff_words))
984 fputs(line_prefix, diff_words->opt->file);
985 fn_out_diff_words_write_helper(diff_words->opt->file,
986 &style->ctx, style->newline,
987 diff_words->plus.text.ptr + diff_words->plus.text.size
988 - diff_words->current_plus, diff_words->current_plus,
989 line_prefix);
990 }
991 diff_words->minus.text.size = diff_words->plus.text.size = 0;
992}
993/* In "color-words" mode, show word-diff of words accumulated in the buffer */
995static void diff_words_flush(struct emit_callback *ecbdata)
996{
997 if (ecbdata->diff_words->minus.text.size ||
998 ecbdata->diff_words->plus.text.size)
999 diff_words_show(ecbdata->diff_words);
1000}
1001static void diff_filespec_load_driver(struct diff_filespec *one)
1003{
1004 /* Use already-loaded driver */
1005 if (one->driver)
1006 return;
1007 if (S_ISREG(one->mode))
1009 one->driver = userdiff_find_by_path(one->path);
1010 /* Fallback to default settings */
1012 if (!one->driver)
1013 one->driver = userdiff_find_by_name("default");
1014}
1015static const char *userdiff_word_regex(struct diff_filespec *one)
1017{
1018 diff_filespec_load_driver(one);
1019 return one->driver->word_regex;
1020}
1021static void init_diff_words_data(struct emit_callback *ecbdata,
1023 struct diff_options *orig_opts,
1024 struct diff_filespec *one,
1025 struct diff_filespec *two)
1026{
1027 int i;
1028 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1029 memcpy(o, orig_opts, sizeof(struct diff_options));
1030 ecbdata->diff_words =
1032 xcalloc(1, sizeof(struct diff_words_data));
1033 ecbdata->diff_words->type = o->word_diff;
1034 ecbdata->diff_words->opt = o;
1035 if (!o->word_regex)
1036 o->word_regex = userdiff_word_regex(one);
1037 if (!o->word_regex)
1038 o->word_regex = userdiff_word_regex(two);
1039 if (!o->word_regex)
1040 o->word_regex = diff_word_regex_cfg;
1041 if (o->word_regex) {
1042 ecbdata->diff_words->word_regex = (regex_t *)
1043 xmalloc(sizeof(regex_t));
1044 if (regcomp(ecbdata->diff_words->word_regex,
1045 o->word_regex,
1046 REG_EXTENDED | REG_NEWLINE))
1047 die ("Invalid regular expression: %s",
1048 o->word_regex);
1049 }
1050 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1051 if (o->word_diff == diff_words_styles[i].type) {
1052 ecbdata->diff_words->style =
1053 &diff_words_styles[i];
1054 break;
1055 }
1056 }
1057 if (want_color(o->use_color)) {
1058 struct diff_words_style *st = ecbdata->diff_words->style;
1059 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1060 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1061 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1062 }
1063}
1064static void free_diff_words_data(struct emit_callback *ecbdata)
1066{
1067 if (ecbdata->diff_words) {
1068 diff_words_flush(ecbdata);
1069 free (ecbdata->diff_words->opt);
1070 free (ecbdata->diff_words->minus.text.ptr);
1071 free (ecbdata->diff_words->minus.orig);
1072 free (ecbdata->diff_words->plus.text.ptr);
1073 free (ecbdata->diff_words->plus.orig);
1074 if (ecbdata->diff_words->word_regex) {
1075 regfree(ecbdata->diff_words->word_regex);
1076 free(ecbdata->diff_words->word_regex);
1077 }
1078 free(ecbdata->diff_words);
1079 ecbdata->diff_words = NULL;
1080 }
1081}
1082const char *diff_get_color(int diff_use_color, enum color_diff ix)
1084{
1085 if (want_color(diff_use_color))
1086 return diff_colors[ix];
1087 return "";
1088}
1089static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1091{
1092 const char *cp;
1093 unsigned long allot;
1094 size_t l = len;
1095 if (ecb->truncate)
1097 return ecb->truncate(line, len);
1098 cp = line;
1099 allot = l;
1100 while (0 < l) {
1101 (void) utf8_width(&cp, &l);
1102 if (!cp)
1103 break; /* truncated in the middle? */
1104 }
1105 return allot - l;
1106}
1107static void find_lno(const char *line, struct emit_callback *ecbdata)
1109{
1110 const char *p;
1111 ecbdata->lno_in_preimage = 0;
1112 ecbdata->lno_in_postimage = 0;
1113 p = strchr(line, '-');
1114 if (!p)
1115 return; /* cannot happen */
1116 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1117 p = strchr(p, '+');
1118 if (!p)
1119 return; /* cannot happen */
1120 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1121}
1122static void fn_out_consume(void *priv, char *line, unsigned long len)
1124{
1125 struct emit_callback *ecbdata = priv;
1126 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1127 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1128 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1129 struct diff_options *o = ecbdata->opt;
1130 char *line_prefix = "";
1131 struct strbuf *msgbuf;
1132 if (o && o->output_prefix) {
1134 msgbuf = o->output_prefix(o, o->output_prefix_data);
1135 line_prefix = msgbuf->buf;
1136 }
1137 if (ecbdata->header) {
1139 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1140 strbuf_reset(ecbdata->header);
1141 ecbdata->header = NULL;
1142 }
1143 *(ecbdata->found_changesp) = 1;
1144 if (ecbdata->label_path[0]) {
1146 const char *name_a_tab, *name_b_tab;
1147 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1149 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1150 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1152 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1153 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1154 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1155 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1156 }
1157 if (diff_suppress_blank_empty
1159 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1160 line[0] = '\n';
1161 len = 1;
1162 }
1163 if (line[0] == '@') {
1165 if (ecbdata->diff_words)
1166 diff_words_flush(ecbdata);
1167 len = sane_truncate_line(ecbdata, line, len);
1168 find_lno(line, ecbdata);
1169 emit_hunk_header(ecbdata, line, len);
1170 if (line[len-1] != '\n')
1171 putc('\n', ecbdata->opt->file);
1172 return;
1173 }
1174 if (len < 1) {
1176 emit_line(ecbdata->opt, reset, reset, line, len);
1177 if (ecbdata->diff_words
1178 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1179 fputs("~\n", ecbdata->opt->file);
1180 return;
1181 }
1182 if (ecbdata->diff_words) {
1184 if (line[0] == '-') {
1185 diff_words_append(line, len,
1186 &ecbdata->diff_words->minus);
1187 return;
1188 } else if (line[0] == '+') {
1189 diff_words_append(line, len,
1190 &ecbdata->diff_words->plus);
1191 return;
1192 } else if (!prefixcmp(line, "\\ ")) {
1193 /*
1194 * Eat the "no newline at eof" marker as if we
1195 * saw a "+" or "-" line with nothing on it,
1196 * and return without diff_words_flush() to
1197 * defer processing. If this is the end of
1198 * preimage, more "+" lines may come after it.
1199 */
1200 return;
1201 }
1202 diff_words_flush(ecbdata);
1203 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1204 emit_line(ecbdata->opt, plain, reset, line, len);
1205 fputs("~\n", ecbdata->opt->file);
1206 } else {
1207 /*
1208 * Skip the prefix character, if any. With
1209 * diff_suppress_blank_empty, there may be
1210 * none.
1211 */
1212 if (line[0] != '\n') {
1213 line++;
1214 len--;
1215 }
1216 emit_line(ecbdata->opt, plain, reset, line, len);
1217 }
1218 return;
1219 }
1220 if (line[0] != '+') {
1222 const char *color =
1223 diff_get_color(ecbdata->color_diff,
1224 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1225 ecbdata->lno_in_preimage++;
1226 if (line[0] == ' ')
1227 ecbdata->lno_in_postimage++;
1228 emit_line(ecbdata->opt, color, reset, line, len);
1229 } else {
1230 ecbdata->lno_in_postimage++;
1231 emit_add_line(reset, ecbdata, line + 1, len - 1);
1232 }
1233}
1234static char *pprint_rename(const char *a, const char *b)
1236{
1237 const char *old = a;
1238 const char *new = b;
1239 struct strbuf name = STRBUF_INIT;
1240 int pfx_length, sfx_length;
1241 int len_a = strlen(a);
1242 int len_b = strlen(b);
1243 int a_midlen, b_midlen;
1244 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1245 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1246 if (qlen_a || qlen_b) {
1248 quote_c_style(a, &name, NULL, 0);
1249 strbuf_addstr(&name, " => ");
1250 quote_c_style(b, &name, NULL, 0);
1251 return strbuf_detach(&name, NULL);
1252 }
1253 /* Find common prefix */
1255 pfx_length = 0;
1256 while (*old && *new && *old == *new) {
1257 if (*old == '/')
1258 pfx_length = old - a + 1;
1259 old++;
1260 new++;
1261 }
1262 /* Find common suffix */
1264 old = a + len_a;
1265 new = b + len_b;
1266 sfx_length = 0;
1267 while (a <= old && b <= new && *old == *new) {
1268 if (*old == '/')
1269 sfx_length = len_a - (old - a);
1270 old--;
1271 new--;
1272 }
1273 /*
1275 * pfx{mid-a => mid-b}sfx
1276 * {pfx-a => pfx-b}sfx
1277 * pfx{sfx-a => sfx-b}
1278 * name-a => name-b
1279 */
1280 a_midlen = len_a - pfx_length - sfx_length;
1281 b_midlen = len_b - pfx_length - sfx_length;
1282 if (a_midlen < 0)
1283 a_midlen = 0;
1284 if (b_midlen < 0)
1285 b_midlen = 0;
1286 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1288 if (pfx_length + sfx_length) {
1289 strbuf_add(&name, a, pfx_length);
1290 strbuf_addch(&name, '{');
1291 }
1292 strbuf_add(&name, a + pfx_length, a_midlen);
1293 strbuf_addstr(&name, " => ");
1294 strbuf_add(&name, b + pfx_length, b_midlen);
1295 if (pfx_length + sfx_length) {
1296 strbuf_addch(&name, '}');
1297 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1298 }
1299 return strbuf_detach(&name, NULL);
1300}
1301struct diffstat_t {
1303 int nr;
1304 int alloc;
1305 struct diffstat_file {
1306 char *from_name;
1307 char *name;
1308 char *print_name;
1309 unsigned is_unmerged:1;
1310 unsigned is_binary:1;
1311 unsigned is_renamed:1;
1312 unsigned is_interesting:1;
1313 uintmax_t added, deleted;
1314 } **files;
1315};
1316static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1318 const char *name_a,
1319 const char *name_b)
1320{
1321 struct diffstat_file *x;
1322 x = xcalloc(sizeof (*x), 1);
1323 if (diffstat->nr == diffstat->alloc) {
1324 diffstat->alloc = alloc_nr(diffstat->alloc);
1325 diffstat->files = xrealloc(diffstat->files,
1326 diffstat->alloc * sizeof(x));
1327 }
1328 diffstat->files[diffstat->nr++] = x;
1329 if (name_b) {
1330 x->from_name = xstrdup(name_a);
1331 x->name = xstrdup(name_b);
1332 x->is_renamed = 1;
1333 }
1334 else {
1335 x->from_name = NULL;
1336 x->name = xstrdup(name_a);
1337 }
1338 return x;
1339}
1340static void diffstat_consume(void *priv, char *line, unsigned long len)
1342{
1343 struct diffstat_t *diffstat = priv;
1344 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1345 if (line[0] == '+')
1347 x->added++;
1348 else if (line[0] == '-')
1349 x->deleted++;
1350}
1351const char mime_boundary_leader[] = "------------";
1353static int scale_linear(int it, int width, int max_change)
1355{
1356 if (!it)
1357 return 0;
1358 /*
1359 * make sure that at least one '-' or '+' is printed if
1360 * there is any change to this path. The easiest way is to
1361 * scale linearly as if the alloted width is one column shorter
1362 * than it is, and then add 1 to the result.
1363 */
1364 return 1 + (it * (width - 1) / max_change);
1365}
1366static void show_name(FILE *file,
1368 const char *prefix, const char *name, int len)
1369{
1370 fprintf(file, " %s%-*s |", prefix, len, name);
1371}
1372static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1374{
1375 if (cnt <= 0)
1376 return;
1377 fprintf(file, "%s", set);
1378 while (cnt--)
1379 putc(ch, file);
1380 fprintf(file, "%s", reset);
1381}
1382static void fill_print_name(struct diffstat_file *file)
1384{
1385 char *pname;
1386 if (file->print_name)
1388 return;
1389 if (!file->is_renamed) {
1391 struct strbuf buf = STRBUF_INIT;
1392 if (quote_c_style(file->name, &buf, NULL, 0)) {
1393 pname = strbuf_detach(&buf, NULL);
1394 } else {
1395 pname = file->name;
1396 strbuf_release(&buf);
1397 }
1398 } else {
1399 pname = pprint_rename(file->from_name, file->name);
1400 }
1401 file->print_name = pname;
1402}
1403int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1405{
1406 struct strbuf sb = STRBUF_INIT;
1407 int ret;
1408 if (!files) {
1410 assert(insertions == 0 && deletions == 0);
1411 return fprintf(fp, "%s\n", " 0 files changed");
1412 }
1413 strbuf_addf(&sb,
1415 (files == 1) ? " %d file changed" : " %d files changed",
1416 files);
1417 /*
1419 * For binary diff, the caller may want to print "x files
1420 * changed" with insertions == 0 && deletions == 0.
1421 *
1422 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1423 * is probably less confusing (i.e skip over "2 files changed
1424 * but nothing about added/removed lines? Is this a bug in Git?").
1425 */
1426 if (insertions || deletions == 0) {
1427 /*
1428 * TRANSLATORS: "+" in (+) is a line addition marker;
1429 * do not translate it.
1430 */
1431 strbuf_addf(&sb,
1432 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1433 insertions);
1434 }
1435 if (deletions || insertions == 0) {
1437 /*
1438 * TRANSLATORS: "-" in (-) is a line removal marker;
1439 * do not translate it.
1440 */
1441 strbuf_addf(&sb,
1442 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1443 deletions);
1444 }
1445 strbuf_addch(&sb, '\n');
1446 ret = fputs(sb.buf, fp);
1447 strbuf_release(&sb);
1448 return ret;
1449}
1450static void show_stats(struct diffstat_t *data, struct diff_options *options)
1452{
1453 int i, len, add, del, adds = 0, dels = 0;
1454 uintmax_t max_change = 0, max_len = 0;
1455 int total_files = data->nr, count;
1456 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1457 const char *reset, *add_c, *del_c;
1458 const char *line_prefix = "";
1459 int extra_shown = 0;
1460 struct strbuf *msg = NULL;
1461 if (data->nr == 0)
1463 return;
1464 if (options->output_prefix) {
1466 msg = options->output_prefix(options, options->output_prefix_data);
1467 line_prefix = msg->buf;
1468 }
1469 count = options->stat_count ? options->stat_count : data->nr;
1471 reset = diff_get_color_opt(options, DIFF_RESET);
1473 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1474 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1475 /*
1477 * Find the longest filename and max number of changes
1478 */
1479 for (i = 0; (i < count) && (i < data->nr); i++) {
1480 struct diffstat_file *file = data->files[i];
1481 uintmax_t change = file->added + file->deleted;
1482 if (!data->files[i]->is_interesting &&
1483 (change == 0)) {
1484 count++; /* not shown == room for one more */
1485 continue;
1486 }
1487 fill_print_name(file);
1488 len = strlen(file->print_name);
1489 if (max_len < len)
1490 max_len = len;
1491 if (file->is_unmerged) {
1493 /* "Unmerged" is 8 characters */
1494 bin_width = bin_width < 8 ? 8 : bin_width;
1495 continue;
1496 }
1497 if (file->is_binary) {
1498 /* "Bin XXX -> YYY bytes" */
1499 int w = 14 + decimal_width(file->added)
1500 + decimal_width(file->deleted);
1501 bin_width = bin_width < w ? w : bin_width;
1502 /* Display change counts aligned with "Bin" */
1503 number_width = 3;
1504 continue;
1505 }
1506 if (max_change < change)
1508 max_change = change;
1509 }
1510 count = i; /* min(count, data->nr) */
1511 /*
1513 * We have width = stat_width or term_columns() columns total.
1514 * We want a maximum of min(max_len, stat_name_width) for the name part.
1515 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1516 * We also need 1 for " " and 4 + decimal_width(max_change)
1517 * for " | NNNN " and one the empty column at the end, altogether
1518 * 6 + decimal_width(max_change).
1519 *
1520 * If there's not enough space, we will use the smaller of
1521 * stat_name_width (if set) and 5/8*width for the filename,
1522 * and the rest for constant elements + graph part, but no more
1523 * than stat_graph_width for the graph part.
1524 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1525 * for the standard terminal size).
1526 *
1527 * In other words: stat_width limits the maximum width, and
1528 * stat_name_width fixes the maximum width of the filename,
1529 * and is also used to divide available columns if there
1530 * aren't enough.
1531 *
1532 * Binary files are displayed with "Bin XXX -> YYY bytes"
1533 * instead of the change count and graph. This part is treated
1534 * similarly to the graph part, except that it is not
1535 * "scaled". If total width is too small to accomodate the
1536 * guaranteed minimum width of the filename part and the
1537 * separators and this message, this message will "overflow"
1538 * making the line longer than the maximum width.
1539 */
1540 if (options->stat_width == -1)
1542 width = term_columns() - options->output_prefix_length;
1543 else
1544 width = options->stat_width ? options->stat_width : 80;
1545 number_width = decimal_width(max_change) > number_width ?
1546 decimal_width(max_change) : number_width;
1547 if (options->stat_graph_width == -1)
1549 options->stat_graph_width = diff_stat_graph_width;
1550 /*
1552 * Guarantee 3/8*16==6 for the graph part
1553 * and 5/8*16==10 for the filename part
1554 */
1555 if (width < 16 + 6 + number_width)
1556 width = 16 + 6 + number_width;
1557 /*
1559 * First assign sizes that are wanted, ignoring available width.
1560 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1561 * starting from "XXX" should fit in graph_width.
1562 */
1563 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1564 if (options->stat_graph_width &&
1565 options->stat_graph_width < graph_width)
1566 graph_width = options->stat_graph_width;
1567 name_width = (options->stat_name_width > 0 &&
1569 options->stat_name_width < max_len) ?
1570 options->stat_name_width : max_len;
1571 /*
1573 * Adjust adjustable widths not to exceed maximum width
1574 */
1575 if (name_width + number_width + 6 + graph_width > width) {
1576 if (graph_width > width * 3/8 - number_width - 6) {
1577 graph_width = width * 3/8 - number_width - 6;
1578 if (graph_width < 6)
1579 graph_width = 6;
1580 }
1581 if (options->stat_graph_width &&
1583 graph_width > options->stat_graph_width)
1584 graph_width = options->stat_graph_width;
1585 if (name_width > width - number_width - 6 - graph_width)
1586 name_width = width - number_width - 6 - graph_width;
1587 else
1588 graph_width = width - number_width - 6 - name_width;
1589 }
1590 /*
1592 * From here name_width is the width of the name area,
1593 * and graph_width is the width of the graph area.
1594 * max_change is used to scale graph properly.
1595 */
1596 for (i = 0; i < count; i++) {
1597 const char *prefix = "";
1598 char *name = data->files[i]->print_name;
1599 uintmax_t added = data->files[i]->added;
1600 uintmax_t deleted = data->files[i]->deleted;
1601 int name_len;
1602 if (!data->files[i]->is_interesting &&
1604 (added + deleted == 0)) {
1605 total_files--;
1606 continue;
1607 }
1608 /*
1609 * "scale" the filename
1610 */
1611 len = name_width;
1612 name_len = strlen(name);
1613 if (name_width < name_len) {
1614 char *slash;
1615 prefix = "...";
1616 len -= 3;
1617 name += name_len - len;
1618 slash = strchr(name, '/');
1619 if (slash)
1620 name = slash;
1621 }
1622 if (data->files[i]->is_binary) {
1624 fprintf(options->file, "%s", line_prefix);
1625 show_name(options->file, prefix, name, len);
1626 fprintf(options->file, " %*s", number_width, "Bin");
1627 if (!added && !deleted) {
1628 putc('\n', options->file);
1629 continue;
1630 }
1631 fprintf(options->file, " %s%"PRIuMAX"%s",
1632 del_c, deleted, reset);
1633 fprintf(options->file, " -> ");
1634 fprintf(options->file, "%s%"PRIuMAX"%s",
1635 add_c, added, reset);
1636 fprintf(options->file, " bytes");
1637 fprintf(options->file, "\n");
1638 continue;
1639 }
1640 else if (data->files[i]->is_unmerged) {
1641 fprintf(options->file, "%s", line_prefix);
1642 show_name(options->file, prefix, name, len);
1643 fprintf(options->file, " Unmerged\n");
1644 continue;
1645 }
1646 /*
1648 * scale the add/delete
1649 */
1650 add = added;
1651 del = deleted;
1652 adds += add;
1653 dels += del;
1654 if (graph_width <= max_change) {
1656 int total = add + del;
1657 total = scale_linear(add + del, graph_width, max_change);
1659 if (total < 2 && add && del)
1660 /* width >= 2 due to the sanity check */
1661 total = 2;
1662 if (add < del) {
1663 add = scale_linear(add, graph_width, max_change);
1664 del = total - add;
1665 } else {
1666 del = scale_linear(del, graph_width, max_change);
1667 add = total - del;
1668 }
1669 }
1670 fprintf(options->file, "%s", line_prefix);
1671 show_name(options->file, prefix, name, len);
1672 fprintf(options->file, " %*"PRIuMAX"%s",
1673 number_width, added + deleted,
1674 added + deleted ? " " : "");
1675 show_graph(options->file, '+', add, add_c, reset);
1676 show_graph(options->file, '-', del, del_c, reset);
1677 fprintf(options->file, "\n");
1678 }
1679 for (i = count; i < data->nr; i++) {
1680 uintmax_t added = data->files[i]->added;
1681 uintmax_t deleted = data->files[i]->deleted;
1682 if (!data->files[i]->is_interesting &&
1683 (added + deleted == 0)) {
1684 total_files--;
1685 continue;
1686 }
1687 adds += added;
1688 dels += deleted;
1689 if (!extra_shown)
1690 fprintf(options->file, "%s ...\n", line_prefix);
1691 extra_shown = 1;
1692 }
1693 fprintf(options->file, "%s", line_prefix);
1694 print_stat_summary(options->file, total_files, adds, dels);
1695}
1696static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1698{
1699 int i, adds = 0, dels = 0, total_files = data->nr;
1700 if (data->nr == 0)
1702 return;
1703 for (i = 0; i < data->nr; i++) {
1705 int added = data->files[i]->added;
1706 int deleted= data->files[i]->deleted;
1707 if (data->files[i]->is_unmerged)
1709 continue;
1710 if (!data->files[i]->is_interesting && (added + deleted == 0)) {
1711 total_files--;
1712 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1713 adds += added;
1714 dels += deleted;
1715 }
1716 }
1717 if (options->output_prefix) {
1718 struct strbuf *msg = NULL;
1719 msg = options->output_prefix(options,
1720 options->output_prefix_data);
1721 fprintf(options->file, "%s", msg->buf);
1722 }
1723 print_stat_summary(options->file, total_files, adds, dels);
1724}
1725static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1727{
1728 int i;
1729 if (data->nr == 0)
1731 return;
1732 for (i = 0; i < data->nr; i++) {
1734 struct diffstat_file *file = data->files[i];
1735 if (options->output_prefix) {
1737 struct strbuf *msg = NULL;
1738 msg = options->output_prefix(options,
1739 options->output_prefix_data);
1740 fprintf(options->file, "%s", msg->buf);
1741 }
1742 if (file->is_binary)
1744 fprintf(options->file, "-\t-\t");
1745 else
1746 fprintf(options->file,
1747 "%"PRIuMAX"\t%"PRIuMAX"\t",
1748 file->added, file->deleted);
1749 if (options->line_termination) {
1750 fill_print_name(file);
1751 if (!file->is_renamed)
1752 write_name_quoted(file->name, options->file,
1753 options->line_termination);
1754 else {
1755 fputs(file->print_name, options->file);
1756 putc(options->line_termination, options->file);
1757 }
1758 } else {
1759 if (file->is_renamed) {
1760 putc('\0', options->file);
1761 write_name_quoted(file->from_name, options->file, '\0');
1762 }
1763 write_name_quoted(file->name, options->file, '\0');
1764 }
1765 }
1766}
1767struct dirstat_file {
1769 const char *name;
1770 unsigned long changed;
1771};
1772struct dirstat_dir {
1774 struct dirstat_file *files;
1775 int alloc, nr, permille, cumulative;
1776};
1777static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1779 unsigned long changed, const char *base, int baselen)
1780{
1781 unsigned long this_dir = 0;
1782 unsigned int sources = 0;
1783 const char *line_prefix = "";
1784 struct strbuf *msg = NULL;
1785 if (opt->output_prefix) {
1787 msg = opt->output_prefix(opt, opt->output_prefix_data);
1788 line_prefix = msg->buf;
1789 }
1790 while (dir->nr) {
1792 struct dirstat_file *f = dir->files;
1793 int namelen = strlen(f->name);
1794 unsigned long this;
1795 char *slash;
1796 if (namelen < baselen)
1798 break;
1799 if (memcmp(f->name, base, baselen))
1800 break;
1801 slash = strchr(f->name + baselen, '/');
1802 if (slash) {
1803 int newbaselen = slash + 1 - f->name;
1804 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1805 sources++;
1806 } else {
1807 this = f->changed;
1808 dir->files++;
1809 dir->nr--;
1810 sources += 2;
1811 }
1812 this_dir += this;
1813 }
1814 /*
1816 * We don't report dirstat's for
1817 * - the top level
1818 * - or cases where everything came from a single directory
1819 * under this directory (sources == 1).
1820 */
1821 if (baselen && sources != 1) {
1822 if (this_dir) {
1823 int permille = this_dir * 1000 / changed;
1824 if (permille >= dir->permille) {
1825 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1826 permille / 10, permille % 10, baselen, base);
1827 if (!dir->cumulative)
1828 return 0;
1829 }
1830 }
1831 }
1832 return this_dir;
1833}
1834static int dirstat_compare(const void *_a, const void *_b)
1836{
1837 const struct dirstat_file *a = _a;
1838 const struct dirstat_file *b = _b;
1839 return strcmp(a->name, b->name);
1840}
1841static void show_dirstat(struct diff_options *options)
1843{
1844 int i;
1845 unsigned long changed;
1846 struct dirstat_dir dir;
1847 struct diff_queue_struct *q = &diff_queued_diff;
1848 dir.files = NULL;
1850 dir.alloc = 0;
1851 dir.nr = 0;
1852 dir.permille = options->dirstat_permille;
1853 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1854 changed = 0;
1856 for (i = 0; i < q->nr; i++) {
1857 struct diff_filepair *p = q->queue[i];
1858 const char *name;
1859 unsigned long copied, added, damage;
1860 int content_changed;
1861 name = p->two->path ? p->two->path : p->one->path;
1863 if (p->one->sha1_valid && p->two->sha1_valid)
1865 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1866 else
1867 content_changed = 1;
1868 if (!content_changed) {
1870 /*
1871 * The SHA1 has not changed, so pre-/post-content is
1872 * identical. We can therefore skip looking at the
1873 * file contents altogether.
1874 */
1875 damage = 0;
1876 goto found_damage;
1877 }
1878 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1880 /*
1881 * In --dirstat-by-file mode, we don't really need to
1882 * look at the actual file contents at all.
1883 * The fact that the SHA1 changed is enough for us to
1884 * add this file to the list of results
1885 * (with each file contributing equal damage).
1886 */
1887 damage = 1;
1888 goto found_damage;
1889 }
1890 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1892 diff_populate_filespec(p->one, 0);
1893 diff_populate_filespec(p->two, 0);
1894 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1895 &copied, &added);
1896 diff_free_filespec_data(p->one);
1897 diff_free_filespec_data(p->two);
1898 } else if (DIFF_FILE_VALID(p->one)) {
1899 diff_populate_filespec(p->one, 1);
1900 copied = added = 0;
1901 diff_free_filespec_data(p->one);
1902 } else if (DIFF_FILE_VALID(p->two)) {
1903 diff_populate_filespec(p->two, 1);
1904 copied = 0;
1905 added = p->two->size;
1906 diff_free_filespec_data(p->two);
1907 } else
1908 continue;
1909 /*
1911 * Original minus copied is the removed material,
1912 * added is the new material. They are both damages
1913 * made to the preimage.
1914 * If the resulting damage is zero, we know that
1915 * diffcore_count_changes() considers the two entries to
1916 * be identical, but since content_changed is true, we
1917 * know that there must have been _some_ kind of change,
1918 * so we force all entries to have damage > 0.
1919 */
1920 damage = (p->one->size - copied) + added;
1921 if (!damage)
1922 damage = 1;
1923found_damage:
1925 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1926 dir.files[dir.nr].name = name;
1927 dir.files[dir.nr].changed = damage;
1928 changed += damage;
1929 dir.nr++;
1930 }
1931 /* This can happen even with many files, if everything was renames */
1933 if (!changed)
1934 return;
1935 /* Show all directories with more than x% of the changes */
1937 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1938 gather_dirstat(options, &dir, changed, "", 0);
1939}
1940static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1942{
1943 int i;
1944 unsigned long changed;
1945 struct dirstat_dir dir;
1946 if (data->nr == 0)
1948 return;
1949 dir.files = NULL;
1951 dir.alloc = 0;
1952 dir.nr = 0;
1953 dir.permille = options->dirstat_permille;
1954 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1955 changed = 0;
1957 for (i = 0; i < data->nr; i++) {
1958 struct diffstat_file *file = data->files[i];
1959 unsigned long damage = file->added + file->deleted;
1960 if (file->is_binary)
1961 /*
1962 * binary files counts bytes, not lines. Must find some
1963 * way to normalize binary bytes vs. textual lines.
1964 * The following heuristic assumes that there are 64
1965 * bytes per "line".
1966 * This is stupid and ugly, but very cheap...
1967 */
1968 damage = (damage + 63) / 64;
1969 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1970 dir.files[dir.nr].name = file->name;
1971 dir.files[dir.nr].changed = damage;
1972 changed += damage;
1973 dir.nr++;
1974 }
1975 /* This can happen even with many files, if everything was renames */
1977 if (!changed)
1978 return;
1979 /* Show all directories with more than x% of the changes */
1981 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1982 gather_dirstat(options, &dir, changed, "", 0);
1983}
1984static void free_diffstat_info(struct diffstat_t *diffstat)
1986{
1987 int i;
1988 for (i = 0; i < diffstat->nr; i++) {
1989 struct diffstat_file *f = diffstat->files[i];
1990 if (f->name != f->print_name)
1991 free(f->print_name);
1992 free(f->name);
1993 free(f->from_name);
1994 free(f);
1995 }
1996 free(diffstat->files);
1997}
1998struct checkdiff_t {
2000 const char *filename;
2001 int lineno;
2002 int conflict_marker_size;
2003 struct diff_options *o;
2004 unsigned ws_rule;
2005 unsigned status;
2006};
2007static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2009{
2010 char firstchar;
2011 int cnt;
2012 if (len < marker_size + 1)
2014 return 0;
2015 firstchar = line[0];
2016 switch (firstchar) {
2017 case '=': case '>': case '<': case '|':
2018 break;
2019 default:
2020 return 0;
2021 }
2022 for (cnt = 1; cnt < marker_size; cnt++)
2023 if (line[cnt] != firstchar)
2024 return 0;
2025 /* line[1] thru line[marker_size-1] are same as firstchar */
2026 if (len < marker_size + 1 || !isspace(line[marker_size]))
2027 return 0;
2028 return 1;
2029}
2030static void checkdiff_consume(void *priv, char *line, unsigned long len)
2032{
2033 struct checkdiff_t *data = priv;
2034 int marker_size = data->conflict_marker_size;
2035 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2036 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2037 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2038 char *err;
2039 char *line_prefix = "";
2040 struct strbuf *msgbuf;
2041 assert(data->o);
2043 if (data->o->output_prefix) {
2044 msgbuf = data->o->output_prefix(data->o,
2045 data->o->output_prefix_data);
2046 line_prefix = msgbuf->buf;
2047 }
2048 if (line[0] == '+') {
2050 unsigned bad;
2051 data->lineno++;
2052 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2053 data->status |= 1;
2054 fprintf(data->o->file,
2055 "%s%s:%d: leftover conflict marker\n",
2056 line_prefix, data->filename, data->lineno);
2057 }
2058 bad = ws_check(line + 1, len - 1, data->ws_rule);
2059 if (!bad)
2060 return;
2061 data->status |= bad;
2062 err = whitespace_error_string(bad);
2063 fprintf(data->o->file, "%s%s:%d: %s.\n",
2064 line_prefix, data->filename, data->lineno, err);
2065 free(err);
2066 emit_line(data->o, set, reset, line, 1);
2067 ws_check_emit(line + 1, len - 1, data->ws_rule,
2068 data->o->file, set, reset, ws);
2069 } else if (line[0] == ' ') {
2070 data->lineno++;
2071 } else if (line[0] == '@') {
2072 char *plus = strchr(line, '+');
2073 if (plus)
2074 data->lineno = strtol(plus, NULL, 10) - 1;
2075 else
2076 die("invalid diff");
2077 }
2078}
2079static unsigned char *deflate_it(char *data,
2081 unsigned long size,
2082 unsigned long *result_size)
2083{
2084 int bound;
2085 unsigned char *deflated;
2086 git_zstream stream;
2087 memset(&stream, 0, sizeof(stream));
2089 git_deflate_init(&stream, zlib_compression_level);
2090 bound = git_deflate_bound(&stream, size);
2091 deflated = xmalloc(bound);
2092 stream.next_out = deflated;
2093 stream.avail_out = bound;
2094 stream.next_in = (unsigned char *)data;
2096 stream.avail_in = size;
2097 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2098 ; /* nothing */
2099 git_deflate_end(&stream);
2100 *result_size = stream.total_out;
2101 return deflated;
2102}
2103static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2105{
2106 void *cp;
2107 void *delta;
2108 void *deflated;
2109 void *data;
2110 unsigned long orig_size;
2111 unsigned long delta_size;
2112 unsigned long deflate_size;
2113 unsigned long data_size;
2114 /* We could do deflated delta, or we could do just deflated two,
2116 * whichever is smaller.
2117 */
2118 delta = NULL;
2119 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2120 if (one->size && two->size) {
2121 delta = diff_delta(one->ptr, one->size,
2122 two->ptr, two->size,
2123 &delta_size, deflate_size);
2124 if (delta) {
2125 void *to_free = delta;
2126 orig_size = delta_size;
2127 delta = deflate_it(delta, delta_size, &delta_size);
2128 free(to_free);
2129 }
2130 }
2131 if (delta && delta_size < deflate_size) {
2133 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2134 free(deflated);
2135 data = delta;
2136 data_size = delta_size;
2137 }
2138 else {
2139 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2140 free(delta);
2141 data = deflated;
2142 data_size = deflate_size;
2143 }
2144 /* emit data encoded in base85 */
2146 cp = data;
2147 while (data_size) {
2148 int bytes = (52 < data_size) ? 52 : data_size;
2149 char line[70];
2150 data_size -= bytes;
2151 if (bytes <= 26)
2152 line[0] = bytes + 'A' - 1;
2153 else
2154 line[0] = bytes - 26 + 'a' - 1;
2155 encode_85(line + 1, cp, bytes);
2156 cp = (char *) cp + bytes;
2157 fprintf(file, "%s", prefix);
2158 fputs(line, file);
2159 fputc('\n', file);
2160 }
2161 fprintf(file, "%s\n", prefix);
2162 free(data);
2163}
2164static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2166{
2167 fprintf(file, "%sGIT binary patch\n", prefix);
2168 emit_binary_diff_body(file, one, two, prefix);
2169 emit_binary_diff_body(file, two, one, prefix);
2170}
2171int diff_filespec_is_binary(struct diff_filespec *one)
2173{
2174 if (one->is_binary == -1) {
2175 diff_filespec_load_driver(one);
2176 if (one->driver->binary != -1)
2177 one->is_binary = one->driver->binary;
2178 else {
2179 if (!one->data && DIFF_FILE_VALID(one))
2180 diff_populate_filespec(one, 0);
2181 if (one->data)
2182 one->is_binary = buffer_is_binary(one->data,
2183 one->size);
2184 if (one->is_binary == -1)
2185 one->is_binary = 0;
2186 }
2187 }
2188 return one->is_binary;
2189}
2190static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2192{
2193 diff_filespec_load_driver(one);
2194 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2195}
2196void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2198{
2199 if (!options->a_prefix)
2200 options->a_prefix = a;
2201 if (!options->b_prefix)
2202 options->b_prefix = b;
2203}
2204struct userdiff_driver *get_textconv(struct diff_filespec *one)
2206{
2207 if (!DIFF_FILE_VALID(one))
2208 return NULL;
2209 diff_filespec_load_driver(one);
2211 return userdiff_get_textconv(one->driver);
2212}
2213static void builtin_diff(const char *name_a,
2215 const char *name_b,
2216 struct diff_filespec *one,
2217 struct diff_filespec *two,
2218 const char *xfrm_msg,
2219 int must_show_header,
2220 struct diff_options *o,
2221 int complete_rewrite)
2222{
2223 mmfile_t mf1, mf2;
2224 const char *lbl[2];
2225 char *a_one, *b_two;
2226 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2227 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2228 const char *a_prefix, *b_prefix;
2229 struct userdiff_driver *textconv_one = NULL;
2230 struct userdiff_driver *textconv_two = NULL;
2231 struct strbuf header = STRBUF_INIT;
2232 struct strbuf *msgbuf;
2233 char *line_prefix = "";
2234 if (o->output_prefix) {
2236 msgbuf = o->output_prefix(o, o->output_prefix_data);
2237 line_prefix = msgbuf->buf;
2238 }
2239 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2241 (!one->mode || S_ISGITLINK(one->mode)) &&
2242 (!two->mode || S_ISGITLINK(two->mode))) {
2243 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2244 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2245 show_submodule_summary(o->file, one ? one->path : two->path,
2246 one->sha1, two->sha1, two->dirty_submodule,
2247 del, add, reset);
2248 return;
2249 }
2250 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2252 textconv_one = get_textconv(one);
2253 textconv_two = get_textconv(two);
2254 }
2255 diff_set_mnemonic_prefix(o, "a/", "b/");
2257 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2258 a_prefix = o->b_prefix;
2259 b_prefix = o->a_prefix;
2260 } else {
2261 a_prefix = o->a_prefix;
2262 b_prefix = o->b_prefix;
2263 }
2264 /* Never use a non-valid filename anywhere if at all possible */
2266 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2267 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2268 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2270 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2271 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2272 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2273 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2274 if (lbl[0][0] == '/') {
2275 /* /dev/null */
2276 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2277 if (xfrm_msg)
2278 strbuf_addstr(&header, xfrm_msg);
2279 must_show_header = 1;
2280 }
2281 else if (lbl[1][0] == '/') {
2282 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2283 if (xfrm_msg)
2284 strbuf_addstr(&header, xfrm_msg);
2285 must_show_header = 1;
2286 }
2287 else {
2288 if (one->mode != two->mode) {
2289 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2290 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2291 must_show_header = 1;
2292 }
2293 if (xfrm_msg)
2294 strbuf_addstr(&header, xfrm_msg);
2295 /*
2297 * we do not run diff between different kind
2298 * of objects.
2299 */
2300 if ((one->mode ^ two->mode) & S_IFMT)
2301 goto free_ab_and_return;
2302 if (complete_rewrite &&
2303 (textconv_one || !diff_filespec_is_binary(one)) &&
2304 (textconv_two || !diff_filespec_is_binary(two))) {
2305 fprintf(o->file, "%s", header.buf);
2306 strbuf_reset(&header);
2307 emit_rewrite_diff(name_a, name_b, one, two,
2308 textconv_one, textconv_two, o);
2309 o->found_changes = 1;
2310 goto free_ab_and_return;
2311 }
2312 }
2313 if (o->irreversible_delete && lbl[1][0] == '/') {
2315 fprintf(o->file, "%s", header.buf);
2316 strbuf_reset(&header);
2317 goto free_ab_and_return;
2318 } else if (!DIFF_OPT_TST(o, TEXT) &&
2319 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2320 (!textconv_two && diff_filespec_is_binary(two)) )) {
2321 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2322 die("unable to read files to diff");
2323 /* Quite common confusing case */
2324 if (mf1.size == mf2.size &&
2325 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2326 if (must_show_header)
2327 fprintf(o->file, "%s", header.buf);
2328 goto free_ab_and_return;
2329 }
2330 fprintf(o->file, "%s", header.buf);
2331 strbuf_reset(&header);
2332 if (DIFF_OPT_TST(o, BINARY))
2333 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2334 else
2335 fprintf(o->file, "%sBinary files %s and %s differ\n",
2336 line_prefix, lbl[0], lbl[1]);
2337 o->found_changes = 1;
2338 } else {
2339 /* Crazy xdl interfaces.. */
2340 const char *diffopts = getenv("GIT_DIFF_OPTS");
2341 xpparam_t xpp;
2342 xdemitconf_t xecfg;
2343 struct emit_callback ecbdata;
2344 const struct userdiff_funcname *pe;
2345 if (must_show_header) {
2347 fprintf(o->file, "%s", header.buf);
2348 strbuf_reset(&header);
2349 }
2350 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2352 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2353 pe = diff_funcname_pattern(one);
2355 if (!pe)
2356 pe = diff_funcname_pattern(two);
2357 memset(&xpp, 0, sizeof(xpp));
2359 memset(&xecfg, 0, sizeof(xecfg));
2360 memset(&ecbdata, 0, sizeof(ecbdata));
2361 ecbdata.label_path = lbl;
2362 ecbdata.color_diff = want_color(o->use_color);
2363 ecbdata.found_changesp = &o->found_changes;
2364 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2365 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2366 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2367 ecbdata.opt = o;
2368 ecbdata.header = header.len ? &header : NULL;
2369 xpp.flags = o->xdl_opts;
2370 xecfg.ctxlen = o->context;
2371 xecfg.interhunkctxlen = o->interhunkcontext;
2372 xecfg.flags = XDL_EMIT_FUNCNAMES;
2373 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2374 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2375 if (pe)
2376 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2377 if (!diffopts)
2378 ;
2379 else if (!prefixcmp(diffopts, "--unified="))
2380 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2381 else if (!prefixcmp(diffopts, "-u"))
2382 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2383 if (o->word_diff)
2384 init_diff_words_data(&ecbdata, o, one, two);
2385 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2386 &xpp, &xecfg);
2387 if (o->word_diff)
2388 free_diff_words_data(&ecbdata);
2389 if (textconv_one)
2390 free(mf1.ptr);
2391 if (textconv_two)
2392 free(mf2.ptr);
2393 xdiff_clear_find_func(&xecfg);
2394 }
2395 free_ab_and_return:
2397 strbuf_release(&header);
2398 diff_free_filespec_data(one);
2399 diff_free_filespec_data(two);
2400 free(a_one);
2401 free(b_two);
2402 return;
2403}
2404static void builtin_diffstat(const char *name_a, const char *name_b,
2406 struct diff_filespec *one,
2407 struct diff_filespec *two,
2408 struct diffstat_t *diffstat,
2409 struct diff_options *o,
2410 struct diff_filepair *p)
2411{
2412 mmfile_t mf1, mf2;
2413 struct diffstat_file *data;
2414 int same_contents;
2415 int complete_rewrite = 0;
2416 if (!DIFF_PAIR_UNMERGED(p)) {
2418 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2419 complete_rewrite = 1;
2420 }
2421 data = diffstat_add(diffstat, name_a, name_b);
2423 data->is_interesting = p->status != 0;
2424 if (!one || !two) {
2426 data->is_unmerged = 1;
2427 return;
2428 }
2429 same_contents = !hashcmp(one->sha1, two->sha1);
2431 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2433 data->is_binary = 1;
2434 if (same_contents) {
2435 data->added = 0;
2436 data->deleted = 0;
2437 } else {
2438 data->added = diff_filespec_size(two);
2439 data->deleted = diff_filespec_size(one);
2440 }
2441 }
2442 else if (complete_rewrite) {
2444 diff_populate_filespec(one, 0);
2445 diff_populate_filespec(two, 0);
2446 data->deleted = count_lines(one->data, one->size);
2447 data->added = count_lines(two->data, two->size);
2448 }
2449 else if (!same_contents) {
2451 /* Crazy xdl interfaces.. */
2452 xpparam_t xpp;
2453 xdemitconf_t xecfg;
2454 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2456 die("unable to read files to diff");
2457 memset(&xpp, 0, sizeof(xpp));
2459 memset(&xecfg, 0, sizeof(xecfg));
2460 xpp.flags = o->xdl_opts;
2461 xecfg.ctxlen = o->context;
2462 xecfg.interhunkctxlen = o->interhunkcontext;
2463 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2464 &xpp, &xecfg);
2465 }
2466 diff_free_filespec_data(one);
2468 diff_free_filespec_data(two);
2469}
2470static void builtin_checkdiff(const char *name_a, const char *name_b,
2472 const char *attr_path,
2473 struct diff_filespec *one,
2474 struct diff_filespec *two,
2475 struct diff_options *o)
2476{
2477 mmfile_t mf1, mf2;
2478 struct checkdiff_t data;
2479 if (!two)
2481 return;
2482 memset(&data, 0, sizeof(data));
2484 data.filename = name_b ? name_b : name_a;
2485 data.lineno = 0;
2486 data.o = o;
2487 data.ws_rule = whitespace_rule(attr_path);
2488 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2489 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2491 die("unable to read files to diff");
2492 /*
2494 * All the other codepaths check both sides, but not checking
2495 * the "old" side here is deliberate. We are checking the newly
2496 * introduced changes, and as long as the "new" side is text, we
2497 * can and should check what it introduces.
2498 */
2499 if (diff_filespec_is_binary(two))
2500 goto free_and_return;
2501 else {
2502 /* Crazy xdl interfaces.. */
2503 xpparam_t xpp;
2504 xdemitconf_t xecfg;
2505 memset(&xpp, 0, sizeof(xpp));
2507 memset(&xecfg, 0, sizeof(xecfg));
2508 xecfg.ctxlen = 1; /* at least one context line */
2509 xpp.flags = 0;
2510 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2511 &xpp, &xecfg);
2512 if (data.ws_rule & WS_BLANK_AT_EOF) {
2514 struct emit_callback ecbdata;
2515 int blank_at_eof;
2516 ecbdata.ws_rule = data.ws_rule;
2518 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2519 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2520 if (blank_at_eof) {
2522 static char *err;
2523 if (!err)
2524 err = whitespace_error_string(WS_BLANK_AT_EOF);
2525 fprintf(o->file, "%s:%d: %s.\n",
2526 data.filename, blank_at_eof, err);
2527 data.status = 1; /* report errors */
2528 }
2529 }
2530 }
2531 free_and_return:
2532 diff_free_filespec_data(one);
2533 diff_free_filespec_data(two);
2534 if (data.status)
2535 DIFF_OPT_SET(o, CHECK_FAILED);
2536}
2537struct diff_filespec *alloc_filespec(const char *path)
2539{
2540 int namelen = strlen(path);
2541 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2542 memset(spec, 0, sizeof(*spec));
2544 spec->path = (char *)(spec + 1);
2545 memcpy(spec->path, path, namelen+1);
2546 spec->count = 1;
2547 spec->is_binary = -1;
2548 return spec;
2549}
2550void free_filespec(struct diff_filespec *spec)
2552{
2553 if (!--spec->count) {
2554 diff_free_filespec_data(spec);
2555 free(spec);
2556 }
2557}
2558void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2560 int sha1_valid, unsigned short mode)
2561{
2562 if (mode) {
2563 spec->mode = canon_mode(mode);
2564 hashcpy(spec->sha1, sha1);
2565 spec->sha1_valid = sha1_valid;
2566 }
2567}
2568/*
2570 * Given a name and sha1 pair, if the index tells us the file in
2571 * the work tree has that object contents, return true, so that
2572 * prepare_temp_file() does not have to inflate and extract.
2573 */
2574static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2575{
2576 struct cache_entry *ce;
2577 struct stat st;
2578 int pos, len;
2579 /*
2581 * We do not read the cache ourselves here, because the
2582 * benchmark with my previous version that always reads cache
2583 * shows that it makes things worse for diff-tree comparing
2584 * two linux-2.6 kernel trees in an already checked out work
2585 * tree. This is because most diff-tree comparisons deal with
2586 * only a small number of files, while reading the cache is
2587 * expensive for a large project, and its cost outweighs the
2588 * savings we get by not inflating the object to a temporary
2589 * file. Practically, this code only helps when we are used
2590 * by diff-cache --cached, which does read the cache before
2591 * calling us.
2592 */
2593 if (!active_cache)
2594 return 0;
2595 /* We want to avoid the working directory if our caller
2597 * doesn't need the data in a normal file, this system
2598 * is rather slow with its stat/open/mmap/close syscalls,
2599 * and the object is contained in a pack file. The pack
2600 * is probably already open and will be faster to obtain
2601 * the data through than the working directory. Loose
2602 * objects however would tend to be slower as they need
2603 * to be individually opened and inflated.
2604 */
2605 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2606 return 0;
2607 len = strlen(name);
2609 pos = cache_name_pos(name, len);
2610 if (pos < 0)
2611 return 0;
2612 ce = active_cache[pos];
2613 /*
2615 * This is not the sha1 we are looking for, or
2616 * unreusable because it is not a regular file.
2617 */
2618 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2619 return 0;
2620 /*
2622 * If ce is marked as "assume unchanged", there is no
2623 * guarantee that work tree matches what we are looking for.
2624 */
2625 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2626 return 0;
2627 /*
2629 * If ce matches the file in the work tree, we can reuse it.
2630 */
2631 if (ce_uptodate(ce) ||
2632 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2633 return 1;
2634 return 0;
2636}
2637static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2639{
2640 int len;
2641 char *data = xmalloc(100), *dirty = "";
2642 /* Are we looking at the work tree? */
2644 if (s->dirty_submodule)
2645 dirty = "-dirty";
2646 len = snprintf(data, 100,
2648 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2649 s->data = data;
2650 s->size = len;
2651 s->should_free = 1;
2652 if (size_only) {
2653 s->data = NULL;
2654 free(data);
2655 }
2656 return 0;
2657}
2658/*
2660 * While doing rename detection and pickaxe operation, we may need to
2661 * grab the data for the blob (or file) for our own in-core comparison.
2662 * diff_filespec has data and size fields for this purpose.
2663 */
2664int diff_populate_filespec(struct diff_filespec *s, int size_only)
2665{
2666 int err = 0;
2667 if (!DIFF_FILE_VALID(s))
2668 die("internal error: asking to populate invalid file.");
2669 if (S_ISDIR(s->mode))
2670 return -1;
2671 if (s->data)
2673 return 0;
2674 if (size_only && 0 < s->size)
2676 return 0;
2677 if (S_ISGITLINK(s->mode))
2679 return diff_populate_gitlink(s, size_only);
2680 if (!s->sha1_valid ||
2682 reuse_worktree_file(s->path, s->sha1, 0)) {
2683 struct strbuf buf = STRBUF_INIT;
2684 struct stat st;
2685 int fd;
2686 if (lstat(s->path, &st) < 0) {
2688 if (errno == ENOENT) {
2689 err_empty:
2690 err = -1;
2691 empty:
2692 s->data = (char *)"";
2693 s->size = 0;
2694 return err;
2695 }
2696 }
2697 s->size = xsize_t(st.st_size);
2698 if (!s->size)
2699 goto empty;
2700 if (S_ISLNK(st.st_mode)) {
2701 struct strbuf sb = STRBUF_INIT;
2702 if (strbuf_readlink(&sb, s->path, s->size))
2704 goto err_empty;
2705 s->size = sb.len;
2706 s->data = strbuf_detach(&sb, NULL);
2707 s->should_free = 1;
2708 return 0;
2709 }
2710 if (size_only)
2711 return 0;
2712 fd = open(s->path, O_RDONLY);
2713 if (fd < 0)
2714 goto err_empty;
2715 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2716 close(fd);
2717 s->should_munmap = 1;
2718 /*
2720 * Convert from working tree format to canonical git format
2721 */
2722 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2723 size_t size = 0;
2724 munmap(s->data, s->size);
2725 s->should_munmap = 0;
2726 s->data = strbuf_detach(&buf, &size);
2727 s->size = size;
2728 s->should_free = 1;
2729 }
2730 }
2731 else {
2732 enum object_type type;
2733 if (size_only) {
2734 type = sha1_object_info(s->sha1, &s->size);
2735 if (type < 0)
2736 die("unable to read %s", sha1_to_hex(s->sha1));
2737 } else {
2738 s->data = read_sha1_file(s->sha1, &type, &s->size);
2739 if (!s->data)
2740 die("unable to read %s", sha1_to_hex(s->sha1));
2741 s->should_free = 1;
2742 }
2743 }
2744 return 0;
2745}
2746void diff_free_filespec_blob(struct diff_filespec *s)
2748{
2749 if (s->should_free)
2750 free(s->data);
2751 else if (s->should_munmap)
2752 munmap(s->data, s->size);
2753 if (s->should_free || s->should_munmap) {
2755 s->should_free = s->should_munmap = 0;
2756 s->data = NULL;
2757 }
2758}
2759void diff_free_filespec_data(struct diff_filespec *s)
2761{
2762 diff_free_filespec_blob(s);
2763 free(s->cnt_data);
2764 s->cnt_data = NULL;
2765}
2766static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2768 void *blob,
2769 unsigned long size,
2770 const unsigned char *sha1,
2771 int mode)
2772{
2773 int fd;
2774 struct strbuf buf = STRBUF_INIT;
2775 struct strbuf template = STRBUF_INIT;
2776 char *path_dup = xstrdup(path);
2777 const char *base = basename(path_dup);
2778 /* Generate "XXXXXX_basename.ext" */
2780 strbuf_addstr(&template, "XXXXXX_");
2781 strbuf_addstr(&template, base);
2782 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2784 strlen(base) + 1);
2785 if (fd < 0)
2786 die_errno("unable to create temp-file");
2787 if (convert_to_working_tree(path,
2788 (const char *)blob, (size_t)size, &buf)) {
2789 blob = buf.buf;
2790 size = buf.len;
2791 }
2792 if (write_in_full(fd, blob, size) != size)
2793 die_errno("unable to write temp-file");
2794 close(fd);
2795 temp->name = temp->tmp_path;
2796 strcpy(temp->hex, sha1_to_hex(sha1));
2797 temp->hex[40] = 0;
2798 sprintf(temp->mode, "%06o", mode);
2799 strbuf_release(&buf);
2800 strbuf_release(&template);
2801 free(path_dup);
2802}
2803static struct diff_tempfile *prepare_temp_file(const char *name,
2805 struct diff_filespec *one)
2806{
2807 struct diff_tempfile *temp = claim_diff_tempfile();
2808 if (!DIFF_FILE_VALID(one)) {
2810 not_a_valid_file:
2811 /* A '-' entry produces this for file-2, and
2812 * a '+' entry produces this for file-1.
2813 */
2814 temp->name = "/dev/null";
2815 strcpy(temp->hex, ".");
2816 strcpy(temp->mode, ".");
2817 return temp;
2818 }
2819 if (!remove_tempfile_installed) {
2821 atexit(remove_tempfile);
2822 sigchain_push_common(remove_tempfile_on_signal);
2823 remove_tempfile_installed = 1;
2824 }
2825 if (!one->sha1_valid ||
2827 reuse_worktree_file(name, one->sha1, 1)) {
2828 struct stat st;
2829 if (lstat(name, &st) < 0) {
2830 if (errno == ENOENT)
2831 goto not_a_valid_file;
2832 die_errno("stat(%s)", name);
2833 }
2834 if (S_ISLNK(st.st_mode)) {
2835 struct strbuf sb = STRBUF_INIT;
2836 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2837 die_errno("readlink(%s)", name);
2838 prep_temp_blob(name, temp, sb.buf, sb.len,
2839 (one->sha1_valid ?
2840 one->sha1 : null_sha1),
2841 (one->sha1_valid ?
2842 one->mode : S_IFLNK));
2843 strbuf_release(&sb);
2844 }
2845 else {
2846 /* we can borrow from the file in the work tree */
2847 temp->name = name;
2848 if (!one->sha1_valid)
2849 strcpy(temp->hex, sha1_to_hex(null_sha1));
2850 else
2851 strcpy(temp->hex, sha1_to_hex(one->sha1));
2852 /* Even though we may sometimes borrow the
2853 * contents from the work tree, we always want
2854 * one->mode. mode is trustworthy even when
2855 * !(one->sha1_valid), as long as
2856 * DIFF_FILE_VALID(one).
2857 */
2858 sprintf(temp->mode, "%06o", one->mode);
2859 }
2860 return temp;
2861 }
2862 else {
2863 if (diff_populate_filespec(one, 0))
2864 die("cannot read data blob for %s", one->path);
2865 prep_temp_blob(name, temp, one->data, one->size,
2866 one->sha1, one->mode);
2867 }
2868 return temp;
2869}
2870/* An external diff command takes:
2872 *
2873 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2874 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2875 *
2876 */
2877static void run_external_diff(const char *pgm,
2878 const char *name,
2879 const char *other,
2880 struct diff_filespec *one,
2881 struct diff_filespec *two,
2882 const char *xfrm_msg,
2883 int complete_rewrite)
2884{
2885 const char *spawn_arg[10];
2886 int retval;
2887 const char **arg = &spawn_arg[0];
2888 if (one && two) {
2890 struct diff_tempfile *temp_one, *temp_two;
2891 const char *othername = (other ? other : name);
2892 temp_one = prepare_temp_file(name, one);
2893 temp_two = prepare_temp_file(othername, two);
2894 *arg++ = pgm;
2895 *arg++ = name;
2896 *arg++ = temp_one->name;
2897 *arg++ = temp_one->hex;
2898 *arg++ = temp_one->mode;
2899 *arg++ = temp_two->name;
2900 *arg++ = temp_two->hex;
2901 *arg++ = temp_two->mode;
2902 if (other) {
2903 *arg++ = other;
2904 *arg++ = xfrm_msg;
2905 }
2906 } else {
2907 *arg++ = pgm;
2908 *arg++ = name;
2909 }
2910 *arg = NULL;
2911 fflush(NULL);
2912 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2913 remove_tempfile();
2914 if (retval) {
2915 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2916 exit(1);
2917 }
2918}
2919static int similarity_index(struct diff_filepair *p)
2921{
2922 return p->score * 100 / MAX_SCORE;
2923}
2924static void fill_metainfo(struct strbuf *msg,
2926 const char *name,
2927 const char *other,
2928 struct diff_filespec *one,
2929 struct diff_filespec *two,
2930 struct diff_options *o,
2931 struct diff_filepair *p,
2932 int *must_show_header,
2933 int use_color)
2934{
2935 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2936 const char *reset = diff_get_color(use_color, DIFF_RESET);
2937 struct strbuf *msgbuf;
2938 char *line_prefix = "";
2939 *must_show_header = 1;
2941 if (o->output_prefix) {
2942 msgbuf = o->output_prefix(o, o->output_prefix_data);
2943 line_prefix = msgbuf->buf;
2944 }
2945 strbuf_init(msg, PATH_MAX * 2 + 300);
2946 switch (p->status) {
2947 case DIFF_STATUS_COPIED:
2948 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2949 line_prefix, set, similarity_index(p));
2950 strbuf_addf(msg, "%s\n%s%scopy from ",
2951 reset, line_prefix, set);
2952 quote_c_style(name, msg, NULL, 0);
2953 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2954 quote_c_style(other, msg, NULL, 0);
2955 strbuf_addf(msg, "%s\n", reset);
2956 break;
2957 case DIFF_STATUS_RENAMED:
2958 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2959 line_prefix, set, similarity_index(p));
2960 strbuf_addf(msg, "%s\n%s%srename from ",
2961 reset, line_prefix, set);
2962 quote_c_style(name, msg, NULL, 0);
2963 strbuf_addf(msg, "%s\n%s%srename to ",
2964 reset, line_prefix, set);
2965 quote_c_style(other, msg, NULL, 0);
2966 strbuf_addf(msg, "%s\n", reset);
2967 break;
2968 case DIFF_STATUS_MODIFIED:
2969 if (p->score) {
2970 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2971 line_prefix,
2972 set, similarity_index(p), reset);
2973 break;
2974 }
2975 /* fallthru */
2976 default:
2977 *must_show_header = 0;
2978 }
2979 if (one && two && hashcmp(one->sha1, two->sha1)) {
2980 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2981 if (DIFF_OPT_TST(o, BINARY)) {
2983 mmfile_t mf;
2984 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2985 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2986 abbrev = 40;
2987 }
2988 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2989 find_unique_abbrev(one->sha1, abbrev));
2990 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2991 if (one->mode == two->mode)
2992 strbuf_addf(msg, " %06o", one->mode);
2993 strbuf_addf(msg, "%s\n", reset);
2994 }
2995}
2996static void run_diff_cmd(const char *pgm,
2998 const char *name,
2999 const char *other,
3000 const char *attr_path,
3001 struct diff_filespec *one,
3002 struct diff_filespec *two,
3003 struct strbuf *msg,
3004 struct diff_options *o,
3005 struct diff_filepair *p)
3006{
3007 const char *xfrm_msg = NULL;
3008 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3009 int must_show_header = 0;
3010 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3013 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3014 if (drv && drv->external)
3015 pgm = drv->external;
3016 }
3017 if (msg) {
3019 /*
3020 * don't use colors when the header is intended for an
3021 * external diff driver
3022 */
3023 fill_metainfo(msg, name, other, one, two, o, p,
3024 &must_show_header,
3025 want_color(o->use_color) && !pgm);
3026 xfrm_msg = msg->len ? msg->buf : NULL;
3027 }
3028 if (pgm) {
3030 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3031 complete_rewrite);
3032 return;
3033 }
3034 if (one && two)
3035 builtin_diff(name, other ? other : name,
3036 one, two, xfrm_msg, must_show_header,
3037 o, complete_rewrite);
3038 else
3039 fprintf(o->file, "* Unmerged path %s\n", name);
3040}
3041static void diff_fill_sha1_info(struct diff_filespec *one)
3043{
3044 if (DIFF_FILE_VALID(one)) {
3045 if (!one->sha1_valid) {
3046 struct stat st;
3047 if (one->is_stdin) {
3048 hashcpy(one->sha1, null_sha1);
3049 return;
3050 }
3051 if (lstat(one->path, &st) < 0)
3052 die_errno("stat '%s'", one->path);
3053 if (index_path(one->sha1, one->path, &st, 0))
3054 die("cannot hash %s", one->path);
3055 }
3056 }
3057 else
3058 hashclr(one->sha1);
3059}
3060static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3062{
3063 /* Strip the prefix but do not molest /dev/null and absolute paths */
3064 if (*namep && **namep != '/') {
3065 *namep += prefix_length;
3066 if (**namep == '/')
3067 ++*namep;
3068 }
3069 if (*otherp && **otherp != '/') {
3070 *otherp += prefix_length;
3071 if (**otherp == '/')
3072 ++*otherp;
3073 }
3074}
3075static void run_diff(struct diff_filepair *p, struct diff_options *o)
3077{
3078 const char *pgm = external_diff();
3079 struct strbuf msg;
3080 struct diff_filespec *one = p->one;
3081 struct diff_filespec *two = p->two;
3082 const char *name;
3083 const char *other;
3084 const char *attr_path;
3085 name = p->one->path;
3087 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3088 attr_path = name;
3089 if (o->prefix_length)
3090 strip_prefix(o->prefix_length, &name, &other);
3091 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3093 pgm = NULL;
3094 if (DIFF_PAIR_UNMERGED(p)) {
3096 run_diff_cmd(pgm, name, NULL, attr_path,
3097 NULL, NULL, NULL, o, p);
3098 return;
3099 }
3100 diff_fill_sha1_info(one);
3102 diff_fill_sha1_info(two);
3103 if (!pgm &&
3105 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3106 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3107 /*
3108 * a filepair that changes between file and symlink
3109 * needs to be split into deletion and creation.
3110 */
3111 struct diff_filespec *null = alloc_filespec(two->path);
3112 run_diff_cmd(NULL, name, other, attr_path,
3113 one, null, &msg, o, p);
3114 free(null);
3115 strbuf_release(&msg);
3116 null = alloc_filespec(one->path);
3118 run_diff_cmd(NULL, name, other, attr_path,
3119 null, two, &msg, o, p);
3120 free(null);
3121 }
3122 else
3123 run_diff_cmd(pgm, name, other, attr_path,
3124 one, two, &msg, o, p);
3125 strbuf_release(&msg);
3127}
3128static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3130 struct diffstat_t *diffstat)
3131{
3132 const char *name;
3133 const char *other;
3134 if (DIFF_PAIR_UNMERGED(p)) {
3136 /* unmerged */
3137 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3138 return;
3139 }
3140 name = p->one->path;
3142 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3143 if (o->prefix_length)
3145 strip_prefix(o->prefix_length, &name, &other);
3146 diff_fill_sha1_info(p->one);
3148 diff_fill_sha1_info(p->two);
3149 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3151}
3152static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3154{
3155 const char *name;
3156 const char *other;
3157 const char *attr_path;
3158 if (DIFF_PAIR_UNMERGED(p)) {
3160 /* unmerged */
3161 return;
3162 }
3163 name = p->one->path;
3165 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3166 attr_path = other ? other : name;
3167 if (o->prefix_length)
3169 strip_prefix(o->prefix_length, &name, &other);
3170 diff_fill_sha1_info(p->one);
3172 diff_fill_sha1_info(p->two);
3173 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3175}
3176void diff_setup(struct diff_options *options)
3178{
3179 memcpy(options, &default_diff_options, sizeof(*options));
3180 options->file = stdout;
3182 options->line_termination = '\n';
3184 options->break_opt = -1;
3185 options->rename_limit = -1;
3186 options->dirstat_permille = diff_dirstat_permille_default;
3187 options->context = diff_context_default;
3188 DIFF_OPT_SET(options, RENAME_EMPTY);
3189 options->change = diff_change;
3191 options->add_remove = diff_addremove;
3192 options->use_color = diff_use_color_default;
3193 options->detect_rename = diff_detect_rename_default;
3194 if (diff_no_prefix) {
3196 options->a_prefix = options->b_prefix = "";
3197 } else if (!diff_mnemonic_prefix) {
3198 options->a_prefix = "a/";
3199 options->b_prefix = "b/";
3200 }
3201}
3202void diff_setup_done(struct diff_options *options)
3204{
3205 int count = 0;
3206 if (options->output_format & DIFF_FORMAT_NAME)
3208 count++;
3209 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3210 count++;
3211 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3212 count++;
3213 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3214 count++;
3215 if (count > 1)
3216 die("--name-only, --name-status, --check and -s are mutually exclusive");
3217 /*
3219 * Most of the time we can say "there are changes"
3220 * only by checking if there are changed paths, but
3221 * --ignore-whitespace* options force us to look
3222 * inside contents.
3223 */
3224 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3226 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3227 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3228 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3229 else
3230 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3231 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3233 options->detect_rename = DIFF_DETECT_COPY;
3234 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3236 options->prefix = NULL;
3237 if (options->prefix)
3238 options->prefix_length = strlen(options->prefix);
3239 else
3240 options->prefix_length = 0;
3241 if (options->output_format & (DIFF_FORMAT_NAME |
3243 DIFF_FORMAT_NAME_STATUS |
3244 DIFF_FORMAT_CHECKDIFF |
3245 DIFF_FORMAT_NO_OUTPUT))
3246 options->output_format &= ~(DIFF_FORMAT_RAW |
3247 DIFF_FORMAT_NUMSTAT |
3248 DIFF_FORMAT_DIFFSTAT |
3249 DIFF_FORMAT_SHORTSTAT |
3250 DIFF_FORMAT_DIRSTAT |
3251 DIFF_FORMAT_SUMMARY |
3252 DIFF_FORMAT_PATCH);
3253 /*
3255 * These cases always need recursive; we do not drop caller-supplied
3256 * recursive bits for other formats here.
3257 */
3258 if (options->output_format & (DIFF_FORMAT_PATCH |
3259 DIFF_FORMAT_NUMSTAT |
3260 DIFF_FORMAT_DIFFSTAT |
3261 DIFF_FORMAT_SHORTSTAT |
3262 DIFF_FORMAT_DIRSTAT |
3263 DIFF_FORMAT_SUMMARY |
3264 DIFF_FORMAT_CHECKDIFF))
3265 DIFF_OPT_SET(options, RECURSIVE);
3266 /*
3267 * Also pickaxe would not work very well if you do not say recursive
3268 */
3269 if (options->pickaxe)
3270 DIFF_OPT_SET(options, RECURSIVE);
3271 /*
3272 * When patches are generated, submodules diffed against the work tree
3273 * must be checked for dirtiness too so it can be shown in the output
3274 */
3275 if (options->output_format & DIFF_FORMAT_PATCH)
3276 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3277 if (options->detect_rename && options->rename_limit < 0)
3279 options->rename_limit = diff_rename_limit_default;
3280 if (options->setup & DIFF_SETUP_USE_CACHE) {
3281 if (!active_cache)
3282 /* read-cache does not die even when it fails
3283 * so it is safe for us to do this here. Also
3284 * it does not smudge active_cache or active_nr
3285 * when it fails, so we do not have to worry about
3286 * cleaning it up ourselves either.
3287 */
3288 read_cache();
3289 }
3290 if (options->abbrev <= 0 || 40 < options->abbrev)
3291 options->abbrev = 40; /* full */
3292 /*
3294 * It does not make sense to show the first hit we happened
3295 * to have found. It does not make sense not to return with
3296 * exit code in such a case either.
3297 */
3298 if (DIFF_OPT_TST(options, QUICK)) {
3299 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3300 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3301 }
3302}
3303static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3305{
3306 char c, *eq;
3307 int len;
3308 if (*arg != '-')
3310 return 0;
3311 c = *++arg;
3312 if (!c)
3313 return 0;
3314 if (c == arg_short) {
3315 c = *++arg;
3316 if (!c)
3317 return 1;
3318 if (val && isdigit(c)) {
3319 char *end;
3320 int n = strtoul(arg, &end, 10);
3321 if (*end)
3322 return 0;
3323 *val = n;
3324 return 1;
3325 }
3326 return 0;
3327 }
3328 if (c != '-')
3329 return 0;
3330 arg++;
3331 eq = strchr(arg, '=');
3332 if (eq)
3333 len = eq - arg;
3334 else
3335 len = strlen(arg);
3336 if (!len || strncmp(arg, arg_long, len))
3337 return 0;
3338 if (eq) {
3339 int n;
3340 char *end;
3341 if (!isdigit(*++eq))
3342 return 0;
3343 n = strtoul(eq, &end, 10);
3344 if (*end)
3345 return 0;
3346 *val = n;
3347 }
3348 return 1;
3349}
3350static int diff_scoreopt_parse(const char *opt);
3352static inline int short_opt(char opt, const char **argv,
3354 const char **optarg)
3355{
3356 const char *arg = argv[0];
3357 if (arg[0] != '-' || arg[1] != opt)
3358 return 0;
3359 if (arg[2] != '\0') {
3360 *optarg = arg + 2;
3361 return 1;
3362 }
3363 if (!argv[1])
3364 die("Option '%c' requires a value", opt);
3365 *optarg = argv[1];
3366 return 2;
3367}
3368int parse_long_opt(const char *opt, const char **argv,
3370 const char **optarg)
3371{
3372 const char *arg = argv[0];
3373 if (arg[0] != '-' || arg[1] != '-')
3374 return 0;
3375 arg += strlen("--");
3376 if (prefixcmp(arg, opt))
3377 return 0;
3378 arg += strlen(opt);
3379 if (*arg == '=') { /* sticked form: --option=value */
3380 *optarg = arg + 1;
3381 return 1;
3382 }
3383 if (*arg != '\0')
3384 return 0;
3385 /* separate form: --option value */
3386 if (!argv[1])
3387 die("Option '--%s' requires a value", opt);
3388 *optarg = argv[1];
3389 return 2;
3390}
3391static int stat_opt(struct diff_options *options, const char **av)
3393{
3394 const char *arg = av[0];
3395 char *end;
3396 int width = options->stat_width;
3397 int name_width = options->stat_name_width;
3398 int graph_width = options->stat_graph_width;
3399 int count = options->stat_count;
3400 int argcount = 1;
3401 arg += strlen("--stat");
3403 end = (char *)arg;
3404 switch (*arg) {
3406 case '-':
3407 if (!prefixcmp(arg, "-width")) {
3408 arg += strlen("-width");
3409 if (*arg == '=')
3410 width = strtoul(arg + 1, &end, 10);
3411 else if (!*arg && !av[1])
3412 die("Option '--stat-width' requires a value");
3413 else if (!*arg) {
3414 width = strtoul(av[1], &end, 10);
3415 argcount = 2;
3416 }
3417 } else if (!prefixcmp(arg, "-name-width")) {
3418 arg += strlen("-name-width");
3419 if (*arg == '=')
3420 name_width = strtoul(arg + 1, &end, 10);
3421 else if (!*arg && !av[1])
3422 die("Option '--stat-name-width' requires a value");
3423 else if (!*arg) {
3424 name_width = strtoul(av[1], &end, 10);
3425 argcount = 2;
3426 }
3427 } else if (!prefixcmp(arg, "-graph-width")) {
3428 arg += strlen("-graph-width");
3429 if (*arg == '=')
3430 graph_width = strtoul(arg + 1, &end, 10);
3431 else if (!*arg && !av[1])
3432 die("Option '--stat-graph-width' requires a value");
3433 else if (!*arg) {
3434 graph_width = strtoul(av[1], &end, 10);
3435 argcount = 2;
3436 }
3437 } else if (!prefixcmp(arg, "-count")) {
3438 arg += strlen("-count");
3439 if (*arg == '=')
3440 count = strtoul(arg + 1, &end, 10);
3441 else if (!*arg && !av[1])
3442 die("Option '--stat-count' requires a value");
3443 else if (!*arg) {
3444 count = strtoul(av[1], &end, 10);
3445 argcount = 2;
3446 }
3447 }
3448 break;
3449 case '=':
3450 width = strtoul(arg+1, &end, 10);
3451 if (*end == ',')
3452 name_width = strtoul(end+1, &end, 10);
3453 if (*end == ',')
3454 count = strtoul(end+1, &end, 10);
3455 }
3456 /* Important! This checks all the error cases! */
3458 if (*end)
3459 return 0;
3460 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3461 options->stat_name_width = name_width;
3462 options->stat_graph_width = graph_width;
3463 options->stat_width = width;
3464 options->stat_count = count;
3465 return argcount;
3466}
3467static int parse_dirstat_opt(struct diff_options *options, const char *params)
3469{
3470 struct strbuf errmsg = STRBUF_INIT;
3471 if (parse_dirstat_params(options, params, &errmsg))
3472 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3473 errmsg.buf);
3474 strbuf_release(&errmsg);
3475 /*
3476 * The caller knows a dirstat-related option is given from the command
3477 * line; allow it to say "return this_function();"
3478 */
3479 options->output_format |= DIFF_FORMAT_DIRSTAT;
3480 return 1;
3481}
3482int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3484{
3485 const char *arg = av[0];
3486 const char *optarg;
3487 int argcount;
3488 /* Output format options */
3490 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3491 options->output_format |= DIFF_FORMAT_PATCH;
3492 else if (opt_arg(arg, 'U', "unified", &options->context))
3493 options->output_format |= DIFF_FORMAT_PATCH;
3494 else if (!strcmp(arg, "--raw"))
3495 options->output_format |= DIFF_FORMAT_RAW;
3496 else if (!strcmp(arg, "--patch-with-raw"))
3497 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3498 else if (!strcmp(arg, "--numstat"))
3499 options->output_format |= DIFF_FORMAT_NUMSTAT;
3500 else if (!strcmp(arg, "--shortstat"))
3501 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3502 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3503 return parse_dirstat_opt(options, "");
3504 else if (!prefixcmp(arg, "-X"))
3505 return parse_dirstat_opt(options, arg + 2);
3506 else if (!prefixcmp(arg, "--dirstat="))
3507 return parse_dirstat_opt(options, arg + 10);
3508 else if (!strcmp(arg, "--cumulative"))
3509 return parse_dirstat_opt(options, "cumulative");
3510 else if (!strcmp(arg, "--dirstat-by-file"))
3511 return parse_dirstat_opt(options, "files");
3512 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3513 parse_dirstat_opt(options, "files");
3514 return parse_dirstat_opt(options, arg + 18);
3515 }
3516 else if (!strcmp(arg, "--check"))
3517 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3518 else if (!strcmp(arg, "--summary"))
3519 options->output_format |= DIFF_FORMAT_SUMMARY;
3520 else if (!strcmp(arg, "--patch-with-stat"))
3521 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3522 else if (!strcmp(arg, "--name-only"))
3523 options->output_format |= DIFF_FORMAT_NAME;
3524 else if (!strcmp(arg, "--name-status"))
3525 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3526 else if (!strcmp(arg, "-s"))
3527 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3528 else if (!prefixcmp(arg, "--stat"))
3529 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3530 return stat_opt(options, av);
3531 /* renames options */
3533 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3534 !strcmp(arg, "--break-rewrites")) {
3535 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3536 return error("invalid argument to -B: %s", arg+2);
3537 }
3538 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3539 !strcmp(arg, "--find-renames")) {
3540 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3541 return error("invalid argument to -M: %s", arg+2);
3542 options->detect_rename = DIFF_DETECT_RENAME;
3543 }
3544 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3545 options->irreversible_delete = 1;
3546 }
3547 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3548 !strcmp(arg, "--find-copies")) {
3549 if (options->detect_rename == DIFF_DETECT_COPY)
3550 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3551 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3552 return error("invalid argument to -C: %s", arg+2);
3553 options->detect_rename = DIFF_DETECT_COPY;
3554 }
3555 else if (!strcmp(arg, "--no-renames"))
3556 options->detect_rename = 0;
3557 else if (!strcmp(arg, "--rename-empty"))
3558 DIFF_OPT_SET(options, RENAME_EMPTY);
3559 else if (!strcmp(arg, "--no-rename-empty"))
3560 DIFF_OPT_CLR(options, RENAME_EMPTY);
3561 else if (!strcmp(arg, "--relative"))
3562 DIFF_OPT_SET(options, RELATIVE_NAME);
3563 else if (!prefixcmp(arg, "--relative=")) {
3564 DIFF_OPT_SET(options, RELATIVE_NAME);
3565 options->prefix = arg + 11;
3566 }
3567 /* xdiff options */
3569 else if (!strcmp(arg, "--minimal"))
3570 DIFF_XDL_SET(options, NEED_MINIMAL);
3571 else if (!strcmp(arg, "--no-minimal"))
3572 DIFF_XDL_CLR(options, NEED_MINIMAL);
3573 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3574 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3575 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3576 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3577 else if (!strcmp(arg, "--ignore-space-at-eol"))
3578 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3579 else if (!strcmp(arg, "--patience"))
3580 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3581 else if (!strcmp(arg, "--histogram"))
3582 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3583 /* flags options */
3585 else if (!strcmp(arg, "--binary")) {
3586 options->output_format |= DIFF_FORMAT_PATCH;
3587 DIFF_OPT_SET(options, BINARY);
3588 }
3589 else if (!strcmp(arg, "--full-index"))
3590 DIFF_OPT_SET(options, FULL_INDEX);
3591 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3592 DIFF_OPT_SET(options, TEXT);
3593 else if (!strcmp(arg, "-R"))
3594 DIFF_OPT_SET(options, REVERSE_DIFF);
3595 else if (!strcmp(arg, "--find-copies-harder"))
3596 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3597 else if (!strcmp(arg, "--follow"))
3598 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3599 else if (!strcmp(arg, "--color"))
3600 options->use_color = 1;
3601 else if (!prefixcmp(arg, "--color=")) {
3602 int value = git_config_colorbool(NULL, arg+8);
3603 if (value < 0)
3604 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3605 options->use_color = value;
3606 }
3607 else if (!strcmp(arg, "--no-color"))
3608 options->use_color = 0;
3609 else if (!strcmp(arg, "--color-words")) {
3610 options->use_color = 1;
3611 options->word_diff = DIFF_WORDS_COLOR;
3612 }
3613 else if (!prefixcmp(arg, "--color-words=")) {
3614 options->use_color = 1;
3615 options->word_diff = DIFF_WORDS_COLOR;
3616 options->word_regex = arg + 14;
3617 }
3618 else if (!strcmp(arg, "--word-diff")) {
3619 if (options->word_diff == DIFF_WORDS_NONE)
3620 options->word_diff = DIFF_WORDS_PLAIN;
3621 }
3622 else if (!prefixcmp(arg, "--word-diff=")) {
3623 const char *type = arg + 12;
3624 if (!strcmp(type, "plain"))
3625 options->word_diff = DIFF_WORDS_PLAIN;
3626 else if (!strcmp(type, "color")) {
3627 options->use_color = 1;
3628 options->word_diff = DIFF_WORDS_COLOR;
3629 }
3630 else if (!strcmp(type, "porcelain"))
3631 options->word_diff = DIFF_WORDS_PORCELAIN;
3632 else if (!strcmp(type, "none"))
3633 options->word_diff = DIFF_WORDS_NONE;
3634 else
3635 die("bad --word-diff argument: %s", type);
3636 }
3637 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3638 if (options->word_diff == DIFF_WORDS_NONE)
3639 options->word_diff = DIFF_WORDS_PLAIN;
3640 options->word_regex = optarg;
3641 return argcount;
3642 }
3643 else if (!strcmp(arg, "--exit-code"))
3644 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3645 else if (!strcmp(arg, "--quiet"))
3646 DIFF_OPT_SET(options, QUICK);
3647 else if (!strcmp(arg, "--ext-diff"))
3648 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3649 else if (!strcmp(arg, "--no-ext-diff"))
3650 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3651 else if (!strcmp(arg, "--textconv"))
3652 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3653 else if (!strcmp(arg, "--no-textconv"))
3654 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3655 else if (!strcmp(arg, "--ignore-submodules")) {
3656 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3657 handle_ignore_submodules_arg(options, "all");
3658 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3659 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3660 handle_ignore_submodules_arg(options, arg + 20);
3661 } else if (!strcmp(arg, "--submodule"))
3662 DIFF_OPT_SET(options, SUBMODULE_LOG);
3663 else if (!prefixcmp(arg, "--submodule=")) {
3664 if (!strcmp(arg + 12, "log"))
3665 DIFF_OPT_SET(options, SUBMODULE_LOG);
3666 }
3667 /* misc options */
3669 else if (!strcmp(arg, "-z"))
3670 options->line_termination = 0;
3671 else if ((argcount = short_opt('l', av, &optarg))) {
3672 options->rename_limit = strtoul(optarg, NULL, 10);
3673 return argcount;
3674 }
3675 else if ((argcount = short_opt('S', av, &optarg))) {
3676 options->pickaxe = optarg;
3677 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3678 return argcount;
3679 } else if ((argcount = short_opt('G', av, &optarg))) {
3680 options->pickaxe = optarg;
3681 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3682 return argcount;
3683 }
3684 else if (!strcmp(arg, "--pickaxe-all"))
3685 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3686 else if (!strcmp(arg, "--pickaxe-regex"))
3687 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3688 else if ((argcount = short_opt('O', av, &optarg))) {
3689 options->orderfile = optarg;
3690 return argcount;
3691 }
3692 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3693 options->filter = optarg;
3694 return argcount;
3695 }
3696 else if (!strcmp(arg, "--abbrev"))
3697 options->abbrev = DEFAULT_ABBREV;
3698 else if (!prefixcmp(arg, "--abbrev=")) {
3699 options->abbrev = strtoul(arg + 9, NULL, 10);
3700 if (options->abbrev < MINIMUM_ABBREV)
3701 options->abbrev = MINIMUM_ABBREV;
3702 else if (40 < options->abbrev)
3703 options->abbrev = 40;
3704 }
3705 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3706 options->a_prefix = optarg;
3707 return argcount;
3708 }
3709 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3710 options->b_prefix = optarg;
3711 return argcount;
3712 }
3713 else if (!strcmp(arg, "--no-prefix"))
3714 options->a_prefix = options->b_prefix = "";
3715 else if (opt_arg(arg, '\0', "inter-hunk-context",
3716 &options->interhunkcontext))
3717 ;
3718 else if (!strcmp(arg, "-W"))
3719 DIFF_OPT_SET(options, FUNCCONTEXT);
3720 else if (!strcmp(arg, "--function-context"))
3721 DIFF_OPT_SET(options, FUNCCONTEXT);
3722 else if (!strcmp(arg, "--no-function-context"))
3723 DIFF_OPT_CLR(options, FUNCCONTEXT);
3724 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3725 options->file = fopen(optarg, "w");
3726 if (!options->file)
3727 die_errno("Could not open '%s'", optarg);
3728 options->close_file = 1;
3729 return argcount;
3730 } else
3731 return 0;
3732 return 1;
3733}
3734int parse_rename_score(const char **cp_p)
3736{
3737 unsigned long num, scale;
3738 int ch, dot;
3739 const char *cp = *cp_p;
3740 num = 0;
3742 scale = 1;
3743 dot = 0;
3744 for (;;) {
3745 ch = *cp;
3746 if ( !dot && ch == '.' ) {
3747 scale = 1;
3748 dot = 1;
3749 } else if ( ch == '%' ) {
3750 scale = dot ? scale*100 : 100;
3751 cp++; /* % is always at the end */
3752 break;
3753 } else if ( ch >= '0' && ch <= '9' ) {
3754 if ( scale < 100000 ) {
3755 scale *= 10;
3756 num = (num*10) + (ch-'0');
3757 }
3758 } else {
3759 break;
3760 }
3761 cp++;
3762 }
3763 *cp_p = cp;
3764 /* user says num divided by scale and we say internally that
3766 * is MAX_SCORE * num / scale.
3767 */
3768 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3769}
3770static int diff_scoreopt_parse(const char *opt)
3772{
3773 int opt1, opt2, cmd;
3774 if (*opt++ != '-')
3776 return -1;
3777 cmd = *opt++;
3778 if (cmd == '-') {
3779 /* convert the long-form arguments into short-form versions */
3780 if (!prefixcmp(opt, "break-rewrites")) {
3781 opt += strlen("break-rewrites");
3782 if (*opt == 0 || *opt++ == '=')
3783 cmd = 'B';
3784 } else if (!prefixcmp(opt, "find-copies")) {
3785 opt += strlen("find-copies");
3786 if (*opt == 0 || *opt++ == '=')
3787 cmd = 'C';
3788 } else if (!prefixcmp(opt, "find-renames")) {
3789 opt += strlen("find-renames");
3790 if (*opt == 0 || *opt++ == '=')
3791 cmd = 'M';
3792 }
3793 }
3794 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3795 return -1; /* that is not a -M, -C nor -B option */
3796 opt1 = parse_rename_score(&opt);
3798 if (cmd != 'B')
3799 opt2 = 0;
3800 else {
3801 if (*opt == 0)
3802 opt2 = 0;
3803 else if (*opt != '/')
3804 return -1; /* we expect -B80/99 or -B80 */
3805 else {
3806 opt++;
3807 opt2 = parse_rename_score(&opt);
3808 }
3809 }
3810 if (*opt != 0)
3811 return -1;
3812 return opt1 | (opt2 << 16);
3813}
3814struct diff_queue_struct diff_queued_diff;
3816void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3818{
3819 if (queue->alloc <= queue->nr) {
3820 queue->alloc = alloc_nr(queue->alloc);
3821 queue->queue = xrealloc(queue->queue,
3822 sizeof(dp) * queue->alloc);
3823 }
3824 queue->queue[queue->nr++] = dp;
3825}
3826struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3828 struct diff_filespec *one,
3829 struct diff_filespec *two)
3830{
3831 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3832 dp->one = one;
3833 dp->two = two;
3834 if (queue)
3835 diff_q(queue, dp);
3836 return dp;
3837}
3838void diff_free_filepair(struct diff_filepair *p)
3840{
3841 free_filespec(p->one);
3842 free_filespec(p->two);
3843 free(p);
3844}
3845/* This is different from find_unique_abbrev() in that
3847 * it stuffs the result with dots for alignment.
3848 */
3849const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3850{
3851 int abblen;
3852 const char *abbrev;
3853 if (len == 40)
3854 return sha1_to_hex(sha1);
3855 abbrev = find_unique_abbrev(sha1, len);
3857 abblen = strlen(abbrev);
3858 if (abblen < 37) {
3859 static char hex[41];
3860 if (len < abblen && abblen <= len + 2)
3861 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3862 else
3863 sprintf(hex, "%s...", abbrev);
3864 return hex;
3865 }
3866 return sha1_to_hex(sha1);
3867}
3868static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3870{
3871 int line_termination = opt->line_termination;
3872 int inter_name_termination = line_termination ? '\t' : '\0';
3873 if (opt->output_prefix) {
3874 struct strbuf *msg = NULL;
3875 msg = opt->output_prefix(opt, opt->output_prefix_data);
3876 fprintf(opt->file, "%s", msg->buf);
3877 }
3878 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3880 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3881 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3882 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3883 }
3884 if (p->score) {
3885 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3886 inter_name_termination);
3887 } else {
3888 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3889 }
3890 if (p->status == DIFF_STATUS_COPIED ||
3892 p->status == DIFF_STATUS_RENAMED) {
3893 const char *name_a, *name_b;
3894 name_a = p->one->path;
3895 name_b = p->two->path;
3896 strip_prefix(opt->prefix_length, &name_a, &name_b);
3897 write_name_quoted(name_a, opt->file, inter_name_termination);
3898 write_name_quoted(name_b, opt->file, line_termination);
3899 } else {
3900 const char *name_a, *name_b;
3901 name_a = p->one->mode ? p->one->path : p->two->path;
3902 name_b = NULL;
3903 strip_prefix(opt->prefix_length, &name_a, &name_b);
3904 write_name_quoted(name_a, opt->file, line_termination);
3905 }
3906}
3907int diff_unmodified_pair(struct diff_filepair *p)
3909{
3910 /* This function is written stricter than necessary to support
3911 * the currently implemented transformers, but the idea is to
3912 * let transformers to produce diff_filepairs any way they want,
3913 * and filter and clean them up here before producing the output.
3914 */
3915 struct diff_filespec *one = p->one, *two = p->two;
3916 if (DIFF_PAIR_UNMERGED(p))
3918 return 0; /* unmerged is interesting */
3919 /* deletion, addition, mode or type change
3921 * and rename are all interesting.
3922 */
3923 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3924 DIFF_PAIR_MODE_CHANGED(p) ||
3925 strcmp(one->path, two->path))
3926 return 0;
3927 /* both are valid and point at the same path. that is, we are
3929 * dealing with a change.
3930 */
3931 if (one->sha1_valid && two->sha1_valid &&
3932 !hashcmp(one->sha1, two->sha1) &&
3933 !one->dirty_submodule && !two->dirty_submodule)
3934 return 1; /* no change */
3935 if (!one->sha1_valid && !two->sha1_valid)
3936 return 1; /* both look at the same file on the filesystem. */
3937 return 0;
3938}
3939static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3941{
3942 if (diff_unmodified_pair(p))
3943 return;
3944 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3946 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3947 return; /* no tree diffs in patch format */
3948 run_diff(p, o);
3950}
3951static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3953 struct diffstat_t *diffstat)
3954{
3955 if (diff_unmodified_pair(p))
3956 return;
3957 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3959 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3960 return; /* no useful stat for tree diffs */
3961 run_diffstat(p, o, diffstat);
3963}
3964static void diff_flush_checkdiff(struct diff_filepair *p,
3966 struct diff_options *o)
3967{
3968 if (diff_unmodified_pair(p))
3969 return;
3970 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3972 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3973 return; /* nothing to check in tree diffs */
3974 run_checkdiff(p, o);
3976}
3977int diff_queue_is_empty(void)
3979{
3980 struct diff_queue_struct *q = &diff_queued_diff;
3981 int i;
3982 for (i = 0; i < q->nr; i++)
3983 if (!diff_unmodified_pair(q->queue[i]))
3984 return 0;
3985 return 1;
3986}
3987#if DIFF_DEBUG
3989void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3990{
3991 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3992 x, one ? one : "",
3993 s->path,
3994 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3995 s->mode,
3996 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3997 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3998 x, one ? one : "",
3999 s->size, s->xfrm_flags);
4000}
4001void diff_debug_filepair(const struct diff_filepair *p, int i)
4003{
4004 diff_debug_filespec(p->one, i, "one");
4005 diff_debug_filespec(p->two, i, "two");
4006 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4007 p->score, p->status ? p->status : '?',
4008 p->one->rename_used, p->broken_pair);
4009}
4010void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4012{
4013 int i;
4014 if (msg)
4015 fprintf(stderr, "%s\n", msg);
4016 fprintf(stderr, "q->nr = %d\n", q->nr);
4017 for (i = 0; i < q->nr; i++) {
4018 struct diff_filepair *p = q->queue[i];
4019 diff_debug_filepair(p, i);
4020 }
4021}
4022#endif
4023static void diff_resolve_rename_copy(void)
4025{
4026 int i;
4027 struct diff_filepair *p;
4028 struct diff_queue_struct *q = &diff_queued_diff;
4029 diff_debug_queue("resolve-rename-copy", q);
4031 for (i = 0; i < q->nr; i++) {
4033 p = q->queue[i];
4034 p->status = 0; /* undecided */
4035 if (DIFF_PAIR_UNMERGED(p))
4036 p->status = DIFF_STATUS_UNMERGED;
4037 else if (!DIFF_FILE_VALID(p->one))
4038 p->status = DIFF_STATUS_ADDED;
4039 else if (!DIFF_FILE_VALID(p->two))
4040 p->status = DIFF_STATUS_DELETED;
4041 else if (DIFF_PAIR_TYPE_CHANGED(p))
4042 p->status = DIFF_STATUS_TYPE_CHANGED;
4043 /* from this point on, we are dealing with a pair
4045 * whose both sides are valid and of the same type, i.e.
4046 * either in-place edit or rename/copy edit.
4047 */
4048 else if (DIFF_PAIR_RENAME(p)) {
4049 /*
4050 * A rename might have re-connected a broken
4051 * pair up, causing the pathnames to be the
4052 * same again. If so, that's not a rename at
4053 * all, just a modification..
4054 *
4055 * Otherwise, see if this source was used for
4056 * multiple renames, in which case we decrement
4057 * the count, and call it a copy.
4058 */
4059 if (!strcmp(p->one->path, p->two->path))
4060 p->status = DIFF_STATUS_MODIFIED;
4061 else if (--p->one->rename_used > 0)
4062 p->status = DIFF_STATUS_COPIED;
4063 else
4064 p->status = DIFF_STATUS_RENAMED;
4065 }
4066 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4067 p->one->mode != p->two->mode ||
4068 p->one->dirty_submodule ||
4069 p->two->dirty_submodule ||
4070 is_null_sha1(p->one->sha1))
4071 p->status = DIFF_STATUS_MODIFIED;
4072 else {
4073 /* This is a "no-change" entry and should not
4074 * happen anymore, but prepare for broken callers.
4075 */
4076 error("feeding unmodified %s to diffcore",
4077 p->one->path);
4078 p->status = DIFF_STATUS_UNKNOWN;
4079 }
4080 }
4081 diff_debug_queue("resolve-rename-copy done", q);
4082}
4083static int check_pair_status(struct diff_filepair *p)
4085{
4086 switch (p->status) {
4087 case DIFF_STATUS_UNKNOWN:
4088 return 0;
4089 case 0:
4090 die("internal error in diff-resolve-rename-copy");
4091 default:
4092 return 1;
4093 }
4094}
4095static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4097{
4098 int fmt = opt->output_format;
4099 if (fmt & DIFF_FORMAT_CHECKDIFF)
4101 diff_flush_checkdiff(p, opt);
4102 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4103 diff_flush_raw(p, opt);
4104 else if (fmt & DIFF_FORMAT_NAME) {
4105 const char *name_a, *name_b;
4106 name_a = p->two->path;
4107 name_b = NULL;
4108 strip_prefix(opt->prefix_length, &name_a, &name_b);
4109 write_name_quoted(name_a, opt->file, opt->line_termination);
4110 }
4111}
4112static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4114{
4115 if (fs->mode)
4116 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4117 else
4118 fprintf(file, " %s ", newdelete);
4119 write_name_quoted(fs->path, file, '\n');
4120}
4121static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4124 const char *line_prefix)
4125{
4126 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4127 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4128 p->two->mode, show_name ? ' ' : '\n');
4129 if (show_name) {
4130 write_name_quoted(p->two->path, file, '\n');
4131 }
4132 }
4133}
4134static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4136 const char *line_prefix)
4137{
4138 char *names = pprint_rename(p->one->path, p->two->path);
4139 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4141 free(names);
4142 show_mode_change(file, p, 0, line_prefix);
4143}
4144static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4146{
4147 FILE *file = opt->file;
4148 char *line_prefix = "";
4149 if (opt->output_prefix) {
4151 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4152 line_prefix = buf->buf;
4153 }
4154 switch(p->status) {
4156 case DIFF_STATUS_DELETED:
4157 fputs(line_prefix, file);
4158 show_file_mode_name(file, "delete", p->one);
4159 break;
4160 case DIFF_STATUS_ADDED:
4161 fputs(line_prefix, file);
4162 show_file_mode_name(file, "create", p->two);
4163 break;
4164 case DIFF_STATUS_COPIED:
4165 fputs(line_prefix, file);
4166 show_rename_copy(file, "copy", p, line_prefix);
4167 break;
4168 case DIFF_STATUS_RENAMED:
4169 fputs(line_prefix, file);
4170 show_rename_copy(file, "rename", p, line_prefix);
4171 break;
4172 default:
4173 if (p->score) {
4174 fprintf(file, "%s rewrite ", line_prefix);
4175 write_name_quoted(p->two->path, file, ' ');
4176 fprintf(file, "(%d%%)\n", similarity_index(p));
4177 }
4178 show_mode_change(file, p, !p->score, line_prefix);
4179 break;
4180 }
4181}
4182struct patch_id_t {
4184 git_SHA_CTX *ctx;
4185 int patchlen;
4186};
4187static int remove_space(char *line, int len)
4189{
4190 int i;
4191 char *dst = line;
4192 unsigned char c;
4193 for (i = 0; i < len; i++)
4195 if (!isspace((c = line[i])))
4196 *dst++ = c;
4197 return dst - line;
4199}
4200static void patch_id_consume(void *priv, char *line, unsigned long len)
4202{
4203 struct patch_id_t *data = priv;
4204 int new_len;
4205 /* Ignore line numbers when computing the SHA1 of the patch */
4207 if (!prefixcmp(line, "@@ -"))
4208 return;
4209 new_len = remove_space(line, len);
4211 git_SHA1_Update(data->ctx, line, new_len);
4213 data->patchlen += new_len;
4214}
4215/* returns 0 upon success, and writes result into sha1 */
4217static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4218{
4219 struct diff_queue_struct *q = &diff_queued_diff;
4220 int i;
4221 git_SHA_CTX ctx;
4222 struct patch_id_t data;
4223 char buffer[PATH_MAX * 4 + 20];
4224 git_SHA1_Init(&ctx);
4226 memset(&data, 0, sizeof(struct patch_id_t));
4227 data.ctx = &ctx;
4228 for (i = 0; i < q->nr; i++) {
4230 xpparam_t xpp;
4231 xdemitconf_t xecfg;
4232 mmfile_t mf1, mf2;
4233 struct diff_filepair *p = q->queue[i];
4234 int len1, len2;
4235 memset(&xpp, 0, sizeof(xpp));
4237 memset(&xecfg, 0, sizeof(xecfg));
4238 if (p->status == 0)
4239 return error("internal diff status error");
4240 if (p->status == DIFF_STATUS_UNKNOWN)
4241 continue;
4242 if (diff_unmodified_pair(p))
4243 continue;
4244 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4245 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4246 continue;
4247 if (DIFF_PAIR_UNMERGED(p))
4248 continue;
4249 diff_fill_sha1_info(p->one);
4251 diff_fill_sha1_info(p->two);
4252 if (fill_mmfile(&mf1, p->one) < 0 ||
4253 fill_mmfile(&mf2, p->two) < 0)
4254 return error("unable to read files to diff");
4255 len1 = remove_space(p->one->path, strlen(p->one->path));
4257 len2 = remove_space(p->two->path, strlen(p->two->path));
4258 if (p->one->mode == 0)
4259 len1 = snprintf(buffer, sizeof(buffer),
4260 "diff--gita/%.*sb/%.*s"
4261 "newfilemode%06o"
4262 "---/dev/null"
4263 "+++b/%.*s",
4264 len1, p->one->path,
4265 len2, p->two->path,
4266 p->two->mode,
4267 len2, p->two->path);
4268 else if (p->two->mode == 0)
4269 len1 = snprintf(buffer, sizeof(buffer),
4270 "diff--gita/%.*sb/%.*s"
4271 "deletedfilemode%06o"
4272 "---a/%.*s"
4273 "+++/dev/null",
4274 len1, p->one->path,
4275 len2, p->two->path,
4276 p->one->mode,
4277 len1, p->one->path);
4278 else
4279 len1 = snprintf(buffer, sizeof(buffer),
4280 "diff--gita/%.*sb/%.*s"
4281 "---a/%.*s"
4282 "+++b/%.*s",
4283 len1, p->one->path,
4284 len2, p->two->path,
4285 len1, p->one->path,
4286 len2, p->two->path);
4287 git_SHA1_Update(&ctx, buffer, len1);
4288 if (diff_filespec_is_binary(p->one) ||
4290 diff_filespec_is_binary(p->two)) {
4291 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4292 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4293 continue;
4294 }
4295 xpp.flags = 0;
4297 xecfg.ctxlen = 3;
4298 xecfg.flags = 0;
4299 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4300 &xpp, &xecfg);
4301 }
4302 git_SHA1_Final(sha1, &ctx);
4304 return 0;
4305}
4306int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4308{
4309 struct diff_queue_struct *q = &diff_queued_diff;
4310 int i;
4311 int result = diff_get_patch_id(options, sha1);
4312 for (i = 0; i < q->nr; i++)
4314 diff_free_filepair(q->queue[i]);
4315 free(q->queue);
4317 DIFF_QUEUE_CLEAR(q);
4318 return result;
4320}
4321static int is_summary_empty(const struct diff_queue_struct *q)
4323{
4324 int i;
4325 for (i = 0; i < q->nr; i++) {
4327 const struct diff_filepair *p = q->queue[i];
4328 switch (p->status) {
4330 case DIFF_STATUS_DELETED:
4331 case DIFF_STATUS_ADDED:
4332 case DIFF_STATUS_COPIED:
4333 case DIFF_STATUS_RENAMED:
4334 return 0;
4335 default:
4336 if (p->score)
4337 return 0;
4338 if (p->one->mode && p->two->mode &&
4339 p->one->mode != p->two->mode)
4340 return 0;
4341 break;
4342 }
4343 }
4344 return 1;
4345}
4346static const char rename_limit_warning[] =
4348"inexact rename detection was skipped due to too many files.";
4349static const char degrade_cc_to_c_warning[] =
4351"only found copies from modified paths due to too many files.";
4352static const char rename_limit_advice[] =
4354"you may want to set your %s variable to at least "
4355"%d and retry the command.";
4356void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4358{
4359 if (degraded_cc)
4360 warning(degrade_cc_to_c_warning);
4361 else if (needed)
4362 warning(rename_limit_warning);
4363 else
4364 return;
4365 if (0 < needed && needed < 32767)
4366 warning(rename_limit_advice, varname, needed);
4367}
4368void diff_flush(struct diff_options *options)
4370{
4371 struct diff_queue_struct *q = &diff_queued_diff;
4372 int i, output_format = options->output_format;
4373 int separator = 0;
4374 int dirstat_by_line = 0;
4375 /*
4377 * Order: raw, stat, summary, patch
4378 * or: name/name-status/checkdiff (other bits clear)
4379 */
4380 if (!q->nr)
4381 goto free_queue;
4382 if (output_format & (DIFF_FORMAT_RAW |
4384 DIFF_FORMAT_NAME |
4385 DIFF_FORMAT_NAME_STATUS |
4386 DIFF_FORMAT_CHECKDIFF)) {
4387 for (i = 0; i < q->nr; i++) {
4388 struct diff_filepair *p = q->queue[i];
4389 if (check_pair_status(p))
4390 flush_one_pair(p, options);
4391 }
4392 separator++;
4393 }
4394 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4396 dirstat_by_line = 1;
4397 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4399 dirstat_by_line) {
4400 struct diffstat_t diffstat;
4401 memset(&diffstat, 0, sizeof(struct diffstat_t));
4403 for (i = 0; i < q->nr; i++) {
4404 struct diff_filepair *p = q->queue[i];
4405 if (check_pair_status(p))
4406 diff_flush_stat(p, options, &diffstat);
4407 }
4408 if (output_format & DIFF_FORMAT_NUMSTAT)
4409 show_numstat(&diffstat, options);
4410 if (output_format & DIFF_FORMAT_DIFFSTAT)
4411 show_stats(&diffstat, options);
4412 if (output_format & DIFF_FORMAT_SHORTSTAT)
4413 show_shortstats(&diffstat, options);
4414 if (output_format & DIFF_FORMAT_DIRSTAT)
4415 show_dirstat_by_line(&diffstat, options);
4416 free_diffstat_info(&diffstat);
4417 separator++;
4418 }
4419 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4420 show_dirstat(options);
4421 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4423 for (i = 0; i < q->nr; i++) {
4424 diff_summary(options, q->queue[i]);
4425 }
4426 separator++;
4427 }
4428 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4430 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4431 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4432 /*
4433 * run diff_flush_patch for the exit status. setting
4434 * options->file to /dev/null should be safe, becaue we
4435 * aren't supposed to produce any output anyway.
4436 */
4437 if (options->close_file)
4438 fclose(options->file);
4439 options->file = fopen("/dev/null", "w");
4440 if (!options->file)
4441 die_errno("Could not open /dev/null");
4442 options->close_file = 1;
4443 for (i = 0; i < q->nr; i++) {
4444 struct diff_filepair *p = q->queue[i];
4445 if (check_pair_status(p))
4446 diff_flush_patch(p, options);
4447 if (options->found_changes)
4448 break;
4449 }
4450 }
4451 if (output_format & DIFF_FORMAT_PATCH) {
4453 if (separator) {
4454 if (options->output_prefix) {
4455 struct strbuf *msg = NULL;
4456 msg = options->output_prefix(options,
4457 options->output_prefix_data);
4458 fwrite(msg->buf, msg->len, 1, stdout);
4459 }
4460 putc(options->line_termination, options->file);
4461 if (options->stat_sep) {
4462 /* attach patch instead of inline */
4463 fputs(options->stat_sep, options->file);
4464 }
4465 }
4466 for (i = 0; i < q->nr; i++) {
4468 struct diff_filepair *p = q->queue[i];
4469 if (check_pair_status(p))
4470 diff_flush_patch(p, options);
4471 }
4472 }
4473 if (output_format & DIFF_FORMAT_CALLBACK)
4475 options->format_callback(q, options, options->format_callback_data);
4476 for (i = 0; i < q->nr; i++)
4478 diff_free_filepair(q->queue[i]);
4479free_queue:
4480 free(q->queue);
4481 DIFF_QUEUE_CLEAR(q);
4482 if (options->close_file)
4483 fclose(options->file);
4484 /*
4486 * Report the content-level differences with HAS_CHANGES;
4487 * diff_addremove/diff_change does not set the bit when
4488 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4489 */
4490 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4491 if (options->found_changes)
4492 DIFF_OPT_SET(options, HAS_CHANGES);
4493 else
4494 DIFF_OPT_CLR(options, HAS_CHANGES);
4495 }
4496}
4497static void diffcore_apply_filter(const char *filter)
4499{
4500 int i;
4501 struct diff_queue_struct *q = &diff_queued_diff;
4502 struct diff_queue_struct outq;
4503 DIFF_QUEUE_CLEAR(&outq);
4504 if (!filter)
4506 return;
4507 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4509 int found;
4510 for (i = found = 0; !found && i < q->nr; i++) {
4511 struct diff_filepair *p = q->queue[i];
4512 if (((p->status == DIFF_STATUS_MODIFIED) &&
4513 ((p->score &&
4514 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4515 (!p->score &&
4516 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4517 ((p->status != DIFF_STATUS_MODIFIED) &&
4518 strchr(filter, p->status)))
4519 found++;
4520 }
4521 if (found)
4522 return;
4523 /* otherwise we will clear the whole queue
4525 * by copying the empty outq at the end of this
4526 * function, but first clear the current entries
4527 * in the queue.
4528 */
4529 for (i = 0; i < q->nr; i++)
4530 diff_free_filepair(q->queue[i]);
4531 }
4532 else {
4533 /* Only the matching ones */
4534 for (i = 0; i < q->nr; i++) {
4535 struct diff_filepair *p = q->queue[i];
4536 if (((p->status == DIFF_STATUS_MODIFIED) &&
4538 ((p->score &&
4539 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4540 (!p->score &&
4541 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4542 ((p->status != DIFF_STATUS_MODIFIED) &&
4543 strchr(filter, p->status)))
4544 diff_q(&outq, p);
4545 else
4546 diff_free_filepair(p);
4547 }
4548 }
4549 free(q->queue);
4550 *q = outq;
4551}
4552/* Check whether two filespecs with the same mode and size are identical */
4554static int diff_filespec_is_identical(struct diff_filespec *one,
4555 struct diff_filespec *two)
4556{
4557 if (S_ISGITLINK(one->mode))
4558 return 0;
4559 if (diff_populate_filespec(one, 0))
4560 return 0;
4561 if (diff_populate_filespec(two, 0))
4562 return 0;
4563 return !memcmp(one->data, two->data, one->size);
4564}
4565static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4567{
4568 int i;
4569 struct diff_queue_struct *q = &diff_queued_diff;
4570 struct diff_queue_struct outq;
4571 DIFF_QUEUE_CLEAR(&outq);
4572 for (i = 0; i < q->nr; i++) {
4574 struct diff_filepair *p = q->queue[i];
4575 /*
4577 * 1. Entries that come from stat info dirtiness
4578 * always have both sides (iow, not create/delete),
4579 * one side of the object name is unknown, with
4580 * the same mode and size. Keep the ones that
4581 * do not match these criteria. They have real
4582 * differences.
4583 *
4584 * 2. At this point, the file is known to be modified,
4585 * with the same mode and size, and the object
4586 * name of one side is unknown. Need to inspect
4587 * the identical contents.
4588 */
4589 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4590 !DIFF_FILE_VALID(p->two) ||
4591 (p->one->sha1_valid && p->two->sha1_valid) ||
4592 (p->one->mode != p->two->mode) ||
4593 diff_populate_filespec(p->one, 1) ||
4594 diff_populate_filespec(p->two, 1) ||
4595 (p->one->size != p->two->size) ||
4596 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4597 diff_q(&outq, p);
4598 else {
4599 /*
4600 * The caller can subtract 1 from skip_stat_unmatch
4601 * to determine how many paths were dirty only
4602 * due to stat info mismatch.
4603 */
4604 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4605 diffopt->skip_stat_unmatch++;
4606 diff_free_filepair(p);
4607 }
4608 }
4609 free(q->queue);
4610 *q = outq;
4611}
4612static int diffnamecmp(const void *a_, const void *b_)
4614{
4615 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4616 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4617 const char *name_a, *name_b;
4618 name_a = a->one ? a->one->path : a->two->path;
4620 name_b = b->one ? b->one->path : b->two->path;
4621 return strcmp(name_a, name_b);
4622}
4623void diffcore_fix_diff_index(struct diff_options *options)
4625{
4626 struct diff_queue_struct *q = &diff_queued_diff;
4627 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4628}
4629void diffcore_std(struct diff_options *options)
4631{
4632 if (options->skip_stat_unmatch)
4633 diffcore_skip_stat_unmatch(options);
4634 if (!options->found_follow) {
4635 /* See try_to_follow_renames() in tree-diff.c */
4636 if (options->break_opt != -1)
4637 diffcore_break(options->break_opt);
4638 if (options->detect_rename)
4639 diffcore_rename(options);
4640 if (options->break_opt != -1)
4641 diffcore_merge_broken();
4642 }
4643 if (options->pickaxe)
4644 diffcore_pickaxe(options);
4645 if (options->orderfile)
4646 diffcore_order(options->orderfile);
4647 if (!options->found_follow)
4648 /* See try_to_follow_renames() in tree-diff.c */
4649 diff_resolve_rename_copy();
4650 diffcore_apply_filter(options->filter);
4651 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4653 DIFF_OPT_SET(options, HAS_CHANGES);
4654 else
4655 DIFF_OPT_CLR(options, HAS_CHANGES);
4656 options->found_follow = 0;
4658}
4659int diff_result_code(struct diff_options *opt, int status)
4661{
4662 int result = 0;
4663 diff_warn_rename_limit("diff.renamelimit",
4665 opt->needed_rename_limit,
4666 opt->degraded_cc_to_c);
4667 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4668 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4669 return status;
4670 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4671 DIFF_OPT_TST(opt, HAS_CHANGES))
4672 result |= 01;
4673 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4674 DIFF_OPT_TST(opt, CHECK_FAILED))
4675 result |= 02;
4676 return result;
4677}
4678int diff_can_quit_early(struct diff_options *opt)
4680{
4681 return (DIFF_OPT_TST(opt, QUICK) &&
4682 !opt->filter &&
4683 DIFF_OPT_TST(opt, HAS_CHANGES));
4684}
4685/*
4687 * Shall changes to this submodule be ignored?
4688 *
4689 * Submodule changes can be configured to be ignored separately for each path,
4690 * but that configuration can be overridden from the command line.
4691 */
4692static int is_submodule_ignored(const char *path, struct diff_options *options)
4693{
4694 int ignored = 0;
4695 unsigned orig_flags = options->flags;
4696 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4697 set_diffopt_flags_from_submodule_config(options, path);
4698 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4699 ignored = 1;
4700 options->flags = orig_flags;
4701 return ignored;
4702}
4703void diff_addremove(struct diff_options *options,
4705 int addremove, unsigned mode,
4706 const unsigned char *sha1,
4707 int sha1_valid,
4708 const char *concatpath, unsigned dirty_submodule)
4709{
4710 struct diff_filespec *one, *two;
4711 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4713 return;
4714 /* This may look odd, but it is a preparation for
4716 * feeding "there are unchanged files which should
4717 * not produce diffs, but when you are doing copy
4718 * detection you would need them, so here they are"
4719 * entries to the diff-core. They will be prefixed
4720 * with something like '=' or '*' (I haven't decided
4721 * which but should not make any difference).
4722 * Feeding the same new and old to diff_change()
4723 * also has the same effect.
4724 * Before the final output happens, they are pruned after
4725 * merged into rename/copy pairs as appropriate.
4726 */
4727 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4728 addremove = (addremove == '+' ? '-' :
4729 addremove == '-' ? '+' : addremove);
4730 if (options->prefix &&
4732 strncmp(concatpath, options->prefix, options->prefix_length))
4733 return;
4734 one = alloc_filespec(concatpath);
4736 two = alloc_filespec(concatpath);
4737 if (addremove != '+')
4739 fill_filespec(one, sha1, sha1_valid, mode);
4740 if (addremove != '-') {
4741 fill_filespec(two, sha1, sha1_valid, mode);
4742 two->dirty_submodule = dirty_submodule;
4743 }
4744 diff_queue(&diff_queued_diff, one, two);
4746 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4747 DIFF_OPT_SET(options, HAS_CHANGES);
4748}
4749void diff_change(struct diff_options *options,
4751 unsigned old_mode, unsigned new_mode,
4752 const unsigned char *old_sha1,
4753 const unsigned char *new_sha1,
4754 int old_sha1_valid, int new_sha1_valid,
4755 const char *concatpath,
4756 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4757{
4758 struct diff_filespec *one, *two;
4759 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4761 is_submodule_ignored(concatpath, options))
4762 return;
4763 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4765 unsigned tmp;
4766 const unsigned char *tmp_c;
4767 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4768 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4769 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4770 new_sha1_valid = tmp;
4771 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4772 new_dirty_submodule = tmp;
4773 }
4774 if (options->prefix &&
4776 strncmp(concatpath, options->prefix, options->prefix_length))
4777 return;
4778 one = alloc_filespec(concatpath);
4780 two = alloc_filespec(concatpath);
4781 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
4782 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
4783 one->dirty_submodule = old_dirty_submodule;
4784 two->dirty_submodule = new_dirty_submodule;
4785 diff_queue(&diff_queued_diff, one, two);
4787 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4788 DIFF_OPT_SET(options, HAS_CHANGES);
4789}
4790struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4792{
4793 struct diff_filepair *pair;
4794 struct diff_filespec *one, *two;
4795 if (options->prefix &&
4797 strncmp(path, options->prefix, options->prefix_length))
4798 return NULL;
4799 one = alloc_filespec(path);
4801 two = alloc_filespec(path);
4802 pair = diff_queue(&diff_queued_diff, one, two);
4803 pair->is_unmerged = 1;
4804 return pair;
4805}
4806static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4808 size_t *outsize)
4809{
4810 struct diff_tempfile *temp;
4811 const char *argv[3];
4812 const char **arg = argv;
4813 struct child_process child;
4814 struct strbuf buf = STRBUF_INIT;
4815 int err = 0;
4816 temp = prepare_temp_file(spec->path, spec);
4818 *arg++ = pgm;
4819 *arg++ = temp->name;
4820 *arg = NULL;
4821 memset(&child, 0, sizeof(child));
4823 child.use_shell = 1;
4824 child.argv = argv;
4825 child.out = -1;
4826 if (start_command(&child)) {
4827 remove_tempfile();
4828 return NULL;
4829 }
4830 if (strbuf_read(&buf, child.out, 0) < 0)
4832 err = error("error reading from textconv command '%s'", pgm);
4833 close(child.out);
4834 if (finish_command(&child) || err) {
4836 strbuf_release(&buf);
4837 remove_tempfile();
4838 return NULL;
4839 }
4840 remove_tempfile();
4841 return strbuf_detach(&buf, outsize);
4843}
4844size_t fill_textconv(struct userdiff_driver *driver,
4846 struct diff_filespec *df,
4847 char **outbuf)
4848{
4849 size_t size;
4850 if (!driver || !driver->textconv) {
4852 if (!DIFF_FILE_VALID(df)) {
4853 *outbuf = "";
4854 return 0;
4855 }
4856 if (diff_populate_filespec(df, 0))
4857 die("unable to read files to diff");
4858 *outbuf = df->data;
4859 return df->size;
4860 }
4861 if (driver->textconv_cache && df->sha1_valid) {
4863 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4864 &size);
4865 if (*outbuf)
4866 return size;
4867 }
4868 *outbuf = run_textconv(driver->textconv, df, &size);
4870 if (!*outbuf)
4871 die("unable to read files to diff");
4872 if (driver->textconv_cache && df->sha1_valid) {
4874 /* ignore errors, as we might be in a readonly repository */
4875 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4876 size);
4877 /*
4878 * we could save up changes and flush them all at the end,
4879 * but we would need an extra call after all diffing is done.
4880 * Since generating a cache entry is the slow path anyway,
4881 * this extra overhead probably isn't a big deal.
4882 */
4883 notes_cache_write(driver->textconv_cache);
4884 }
4885 return size;
4887}
4888void setup_diff_pager(struct diff_options *opt)
4890{
4891 /*
4892 * If the user asked for our exit code, then either they want --quiet
4893 * or --exit-code. We should definitely not bother with a pager in the
4894 * former case, as we will generate no output. Since we still properly
4895 * report our exit code even when a pager is run, we _could_ run a
4896 * pager with --exit-code. But since we have not done so historically,
4897 * and because it is easy to find people oneline advising "git diff
4898 * --exit-code" in hooks and other scripts, we do not do so.
4899 */
4900 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4901 check_pager_config("diff") != 0)
4902 setup_pager();
4903}