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Merge branch 'mm/rebase-i-exec'
[git/jnareb-git/bp-gitweb.git] / diff.c
blob6fb97d4623192167e9b9f83b02dfe9250f028c0a
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
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 200;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33 static int diff_no_prefix;
34 static struct diff_options default_diff_options;
35
36 static char diff_colors[][COLOR_MAXLEN] = {
37 GIT_COLOR_RESET,
38 GIT_COLOR_NORMAL, /* PLAIN */
39 GIT_COLOR_BOLD, /* METAINFO */
40 GIT_COLOR_CYAN, /* FRAGINFO */
41 GIT_COLOR_RED, /* OLD */
42 GIT_COLOR_GREEN, /* NEW */
43 GIT_COLOR_YELLOW, /* COMMIT */
44 GIT_COLOR_BG_RED, /* WHITESPACE */
45 GIT_COLOR_NORMAL, /* FUNCINFO */
46 };
47
48 static int parse_diff_color_slot(const char *var, int ofs)
49 {
50 if (!strcasecmp(var+ofs, "plain"))
51 return DIFF_PLAIN;
52 if (!strcasecmp(var+ofs, "meta"))
53 return DIFF_METAINFO;
54 if (!strcasecmp(var+ofs, "frag"))
55 return DIFF_FRAGINFO;
56 if (!strcasecmp(var+ofs, "old"))
57 return DIFF_FILE_OLD;
58 if (!strcasecmp(var+ofs, "new"))
59 return DIFF_FILE_NEW;
60 if (!strcasecmp(var+ofs, "commit"))
61 return DIFF_COMMIT;
62 if (!strcasecmp(var+ofs, "whitespace"))
63 return DIFF_WHITESPACE;
64 if (!strcasecmp(var+ofs, "func"))
65 return DIFF_FUNCINFO;
66 return -1;
67 }
68
69 static int git_config_rename(const char *var, const char *value)
70 {
71 if (!value)
72 return DIFF_DETECT_RENAME;
73 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
74 return DIFF_DETECT_COPY;
75 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
76 }
77
78 /*
79 * These are to give UI layer defaults.
80 * The core-level commands such as git-diff-files should
81 * never be affected by the setting of diff.renames
82 * the user happens to have in the configuration file.
83 */
84 int git_diff_ui_config(const char *var, const char *value, void *cb)
85 {
86 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
87 diff_use_color_default = git_config_colorbool(var, value, -1);
88 return 0;
89 }
90 if (!strcmp(var, "diff.renames")) {
91 diff_detect_rename_default = git_config_rename(var, value);
92 return 0;
93 }
94 if (!strcmp(var, "diff.autorefreshindex")) {
95 diff_auto_refresh_index = git_config_bool(var, value);
96 return 0;
97 }
98 if (!strcmp(var, "diff.mnemonicprefix")) {
99 diff_mnemonic_prefix = git_config_bool(var, value);
100 return 0;
101 }
102 if (!strcmp(var, "diff.noprefix")) {
103 diff_no_prefix = git_config_bool(var, value);
104 return 0;
105 }
106 if (!strcmp(var, "diff.external"))
107 return git_config_string(&external_diff_cmd_cfg, var, value);
108 if (!strcmp(var, "diff.wordregex"))
109 return git_config_string(&diff_word_regex_cfg, var, value);
110
111 if (!strcmp(var, "diff.ignoresubmodules"))
112 handle_ignore_submodules_arg(&default_diff_options, value);
113
114 return git_diff_basic_config(var, value, cb);
115 }
116
117 int git_diff_basic_config(const char *var, const char *value, void *cb)
118 {
119 if (!strcmp(var, "diff.renamelimit")) {
120 diff_rename_limit_default = git_config_int(var, value);
121 return 0;
122 }
123
124 switch (userdiff_config(var, value)) {
125 case 0: break;
126 case -1: return -1;
127 default: return 0;
128 }
129
130 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
131 int slot = parse_diff_color_slot(var, 11);
132 if (slot < 0)
133 return 0;
134 if (!value)
135 return config_error_nonbool(var);
136 color_parse(value, var, diff_colors[slot]);
137 return 0;
138 }
139
140 /* like GNU diff's --suppress-blank-empty option */
141 if (!strcmp(var, "diff.suppressblankempty") ||
142 /* for backwards compatibility */
143 !strcmp(var, "diff.suppress-blank-empty")) {
144 diff_suppress_blank_empty = git_config_bool(var, value);
145 return 0;
146 }
147
148 if (!prefixcmp(var, "submodule."))
149 return parse_submodule_config_option(var, value);
150
151 return git_color_default_config(var, value, cb);
152 }
153
154 static char *quote_two(const char *one, const char *two)
155 {
156 int need_one = quote_c_style(one, NULL, NULL, 1);
157 int need_two = quote_c_style(two, NULL, NULL, 1);
158 struct strbuf res = STRBUF_INIT;
159
160 if (need_one + need_two) {
161 strbuf_addch(&res, '"');
162 quote_c_style(one, &res, NULL, 1);
163 quote_c_style(two, &res, NULL, 1);
164 strbuf_addch(&res, '"');
165 } else {
166 strbuf_addstr(&res, one);
167 strbuf_addstr(&res, two);
168 }
169 return strbuf_detach(&res, NULL);
170 }
171
172 static const char *external_diff(void)
173 {
174 static const char *external_diff_cmd = NULL;
175 static int done_preparing = 0;
176
177 if (done_preparing)
178 return external_diff_cmd;
179 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
180 if (!external_diff_cmd)
181 external_diff_cmd = external_diff_cmd_cfg;
182 done_preparing = 1;
183 return external_diff_cmd;
184 }
185
186 static struct diff_tempfile {
187 const char *name; /* filename external diff should read from */
188 char hex[41];
189 char mode[10];
190 char tmp_path[PATH_MAX];
191 } diff_temp[2];
192
193 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
194
195 struct emit_callback {
196 int color_diff;
197 unsigned ws_rule;
198 int blank_at_eof_in_preimage;
199 int blank_at_eof_in_postimage;
200 int lno_in_preimage;
201 int lno_in_postimage;
202 sane_truncate_fn truncate;
203 const char **label_path;
204 struct diff_words_data *diff_words;
205 struct diff_options *opt;
206 int *found_changesp;
207 struct strbuf *header;
208 };
209
210 static int count_lines(const char *data, int size)
211 {
212 int count, ch, completely_empty = 1, nl_just_seen = 0;
213 count = 0;
214 while (0 < size--) {
215 ch = *data++;
216 if (ch == '\n') {
217 count++;
218 nl_just_seen = 1;
219 completely_empty = 0;
220 }
221 else {
222 nl_just_seen = 0;
223 completely_empty = 0;
224 }
225 }
226 if (completely_empty)
227 return 0;
228 if (!nl_just_seen)
229 count++; /* no trailing newline */
230 return count;
231 }
232
233 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
234 {
235 if (!DIFF_FILE_VALID(one)) {
236 mf->ptr = (char *)""; /* does not matter */
237 mf->size = 0;
238 return 0;
239 }
240 else if (diff_populate_filespec(one, 0))
241 return -1;
242
243 mf->ptr = one->data;
244 mf->size = one->size;
245 return 0;
246 }
247
248 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
249 {
250 char *ptr = mf->ptr;
251 long size = mf->size;
252 int cnt = 0;
253
254 if (!size)
255 return cnt;
256 ptr += size - 1; /* pointing at the very end */
257 if (*ptr != '\n')
258 ; /* incomplete line */
259 else
260 ptr--; /* skip the last LF */
261 while (mf->ptr < ptr) {
262 char *prev_eol;
263 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
264 if (*prev_eol == '\n')
265 break;
266 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
267 break;
268 cnt++;
269 ptr = prev_eol - 1;
270 }
271 return cnt;
272 }
273
274 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
275 struct emit_callback *ecbdata)
276 {
277 int l1, l2, at;
278 unsigned ws_rule = ecbdata->ws_rule;
279 l1 = count_trailing_blank(mf1, ws_rule);
280 l2 = count_trailing_blank(mf2, ws_rule);
281 if (l2 <= l1) {
282 ecbdata->blank_at_eof_in_preimage = 0;
283 ecbdata->blank_at_eof_in_postimage = 0;
284 return;
285 }
286 at = count_lines(mf1->ptr, mf1->size);
287 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
288
289 at = count_lines(mf2->ptr, mf2->size);
290 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
291 }
292
293 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
294 int first, const char *line, int len)
295 {
296 int has_trailing_newline, has_trailing_carriage_return;
297 int nofirst;
298 FILE *file = o->file;
299
300 if (o->output_prefix) {
301 struct strbuf *msg = NULL;
302 msg = o->output_prefix(o, o->output_prefix_data);
303 assert(msg);
304 fwrite(msg->buf, msg->len, 1, file);
305 }
306
307 if (len == 0) {
308 has_trailing_newline = (first == '\n');
309 has_trailing_carriage_return = (!has_trailing_newline &&
310 (first == '\r'));
311 nofirst = has_trailing_newline || has_trailing_carriage_return;
312 } else {
313 has_trailing_newline = (len > 0 && line[len-1] == '\n');
314 if (has_trailing_newline)
315 len--;
316 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
317 if (has_trailing_carriage_return)
318 len--;
319 nofirst = 0;
320 }
321
322 if (len || !nofirst) {
323 fputs(set, file);
324 if (!nofirst)
325 fputc(first, file);
326 fwrite(line, len, 1, file);
327 fputs(reset, file);
328 }
329 if (has_trailing_carriage_return)
330 fputc('\r', file);
331 if (has_trailing_newline)
332 fputc('\n', file);
333 }
334
335 static void emit_line(struct diff_options *o, const char *set, const char *reset,
336 const char *line, int len)
337 {
338 emit_line_0(o, set, reset, line[0], line+1, len-1);
339 }
340
341 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
342 {
343 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
344 ecbdata->blank_at_eof_in_preimage &&
345 ecbdata->blank_at_eof_in_postimage &&
346 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
347 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
348 return 0;
349 return ws_blank_line(line, len, ecbdata->ws_rule);
350 }
351
352 static void emit_add_line(const char *reset,
353 struct emit_callback *ecbdata,
354 const char *line, int len)
355 {
356 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
357 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
358
359 if (!*ws)
360 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
361 else if (new_blank_line_at_eof(ecbdata, line, len))
362 /* Blank line at EOF - paint '+' as well */
363 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
364 else {
365 /* Emit just the prefix, then the rest. */
366 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
367 ws_check_emit(line, len, ecbdata->ws_rule,
368 ecbdata->opt->file, set, reset, ws);
369 }
370 }
371
372 static void emit_hunk_header(struct emit_callback *ecbdata,
373 const char *line, int len)
374 {
375 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
376 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
377 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
378 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
379 static const char atat[2] = { '@', '@' };
380 const char *cp, *ep;
381 struct strbuf msgbuf = STRBUF_INIT;
382 int org_len = len;
383 int i = 1;
384
385 /*
386 * As a hunk header must begin with "@@ -<old>, +<new> @@",
387 * it always is at least 10 bytes long.
388 */
389 if (len < 10 ||
390 memcmp(line, atat, 2) ||
391 !(ep = memmem(line + 2, len - 2, atat, 2))) {
392 emit_line(ecbdata->opt, plain, reset, line, len);
393 return;
394 }
395 ep += 2; /* skip over @@ */
396
397 /* The hunk header in fraginfo color */
398 strbuf_add(&msgbuf, frag, strlen(frag));
399 strbuf_add(&msgbuf, line, ep - line);
400 strbuf_add(&msgbuf, reset, strlen(reset));
401
402 /*
403 * trailing "\r\n"
404 */
405 for ( ; i < 3; i++)
406 if (line[len - i] == '\r' || line[len - i] == '\n')
407 len--;
408
409 /* blank before the func header */
410 for (cp = ep; ep - line < len; ep++)
411 if (*ep != ' ' && *ep != '\t')
412 break;
413 if (ep != cp) {
414 strbuf_add(&msgbuf, plain, strlen(plain));
415 strbuf_add(&msgbuf, cp, ep - cp);
416 strbuf_add(&msgbuf, reset, strlen(reset));
417 }
418
419 if (ep < line + len) {
420 strbuf_add(&msgbuf, func, strlen(func));
421 strbuf_add(&msgbuf, ep, line + len - ep);
422 strbuf_add(&msgbuf, reset, strlen(reset));
423 }
424
425 strbuf_add(&msgbuf, line + len, org_len - len);
426 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
427 strbuf_release(&msgbuf);
428 }
429
430 static struct diff_tempfile *claim_diff_tempfile(void) {
431 int i;
432 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
433 if (!diff_temp[i].name)
434 return diff_temp + i;
435 die("BUG: diff is failing to clean up its tempfiles");
436 }
437
438 static int remove_tempfile_installed;
439
440 static void remove_tempfile(void)
441 {
442 int i;
443 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
444 if (diff_temp[i].name == diff_temp[i].tmp_path)
445 unlink_or_warn(diff_temp[i].name);
446 diff_temp[i].name = NULL;
447 }
448 }
449
450 static void remove_tempfile_on_signal(int signo)
451 {
452 remove_tempfile();
453 sigchain_pop(signo);
454 raise(signo);
455 }
456
457 static void print_line_count(FILE *file, int count)
458 {
459 switch (count) {
460 case 0:
461 fprintf(file, "0,0");
462 break;
463 case 1:
464 fprintf(file, "1");
465 break;
466 default:
467 fprintf(file, "1,%d", count);
468 break;
469 }
470 }
471
472 static void emit_rewrite_lines(struct emit_callback *ecb,
473 int prefix, const char *data, int size)
474 {
475 const char *endp = NULL;
476 static const char *nneof = " No newline at end of file\n";
477 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
478 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
479
480 while (0 < size) {
481 int len;
482
483 endp = memchr(data, '\n', size);
484 len = endp ? (endp - data + 1) : size;
485 if (prefix != '+') {
486 ecb->lno_in_preimage++;
487 emit_line_0(ecb->opt, old, reset, '-',
488 data, len);
489 } else {
490 ecb->lno_in_postimage++;
491 emit_add_line(reset, ecb, data, len);
492 }
493 size -= len;
494 data += len;
495 }
496 if (!endp) {
497 const char *plain = diff_get_color(ecb->color_diff,
498 DIFF_PLAIN);
499 emit_line_0(ecb->opt, plain, reset, '\\',
500 nneof, strlen(nneof));
501 }
502 }
503
504 static void emit_rewrite_diff(const char *name_a,
505 const char *name_b,
506 struct diff_filespec *one,
507 struct diff_filespec *two,
508 struct userdiff_driver *textconv_one,
509 struct userdiff_driver *textconv_two,
510 struct diff_options *o)
511 {
512 int lc_a, lc_b;
513 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
514 const char *name_a_tab, *name_b_tab;
515 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
516 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
517 const char *reset = diff_get_color(color_diff, DIFF_RESET);
518 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
519 const char *a_prefix, *b_prefix;
520 char *data_one, *data_two;
521 size_t size_one, size_two;
522 struct emit_callback ecbdata;
523 char *line_prefix = "";
524 struct strbuf *msgbuf;
525
526 if (o && o->output_prefix) {
527 msgbuf = o->output_prefix(o, o->output_prefix_data);
528 line_prefix = msgbuf->buf;
529 }
530
531 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
532 a_prefix = o->b_prefix;
533 b_prefix = o->a_prefix;
534 } else {
535 a_prefix = o->a_prefix;
536 b_prefix = o->b_prefix;
537 }
538
539 name_a += (*name_a == '/');
540 name_b += (*name_b == '/');
541 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
542 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
543
544 strbuf_reset(&a_name);
545 strbuf_reset(&b_name);
546 quote_two_c_style(&a_name, a_prefix, name_a, 0);
547 quote_two_c_style(&b_name, b_prefix, name_b, 0);
548
549 size_one = fill_textconv(textconv_one, one, &data_one);
550 size_two = fill_textconv(textconv_two, two, &data_two);
551
552 memset(&ecbdata, 0, sizeof(ecbdata));
553 ecbdata.color_diff = color_diff;
554 ecbdata.found_changesp = &o->found_changes;
555 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
556 ecbdata.opt = o;
557 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
558 mmfile_t mf1, mf2;
559 mf1.ptr = (char *)data_one;
560 mf2.ptr = (char *)data_two;
561 mf1.size = size_one;
562 mf2.size = size_two;
563 check_blank_at_eof(&mf1, &mf2, &ecbdata);
564 }
565 ecbdata.lno_in_preimage = 1;
566 ecbdata.lno_in_postimage = 1;
567
568 lc_a = count_lines(data_one, size_one);
569 lc_b = count_lines(data_two, size_two);
570 fprintf(o->file,
571 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
572 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
573 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
574 line_prefix, fraginfo);
575 print_line_count(o->file, lc_a);
576 fprintf(o->file, " +");
577 print_line_count(o->file, lc_b);
578 fprintf(o->file, " @@%s\n", reset);
579 if (lc_a)
580 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
581 if (lc_b)
582 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
583 if (textconv_one)
584 free((char *)data_one);
585 if (textconv_two)
586 free((char *)data_two);
587 }
588
589 struct diff_words_buffer {
590 mmfile_t text;
591 long alloc;
592 struct diff_words_orig {
593 const char *begin, *end;
594 } *orig;
595 int orig_nr, orig_alloc;
596 };
597
598 static void diff_words_append(char *line, unsigned long len,
599 struct diff_words_buffer *buffer)
600 {
601 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
602 line++;
603 len--;
604 memcpy(buffer->text.ptr + buffer->text.size, line, len);
605 buffer->text.size += len;
606 buffer->text.ptr[buffer->text.size] = '\0';
607 }
608
609 struct diff_words_style_elem
610 {
611 const char *prefix;
612 const char *suffix;
613 const char *color; /* NULL; filled in by the setup code if
614 * color is enabled */
615 };
616
617 struct diff_words_style
618 {
619 enum diff_words_type type;
620 struct diff_words_style_elem new, old, ctx;
621 const char *newline;
622 };
623
624 struct diff_words_style diff_words_styles[] = {
625 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
626 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
627 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
628 };
629
630 struct diff_words_data {
631 struct diff_words_buffer minus, plus;
632 const char *current_plus;
633 int last_minus;
634 struct diff_options *opt;
635 regex_t *word_regex;
636 enum diff_words_type type;
637 struct diff_words_style *style;
638 };
639
640 static int fn_out_diff_words_write_helper(FILE *fp,
641 struct diff_words_style_elem *st_el,
642 const char *newline,
643 size_t count, const char *buf,
644 const char *line_prefix)
645 {
646 int print = 0;
647
648 while (count) {
649 char *p = memchr(buf, '\n', count);
650 if (print)
651 fputs(line_prefix, fp);
652 if (p != buf) {
653 if (st_el->color && fputs(st_el->color, fp) < 0)
654 return -1;
655 if (fputs(st_el->prefix, fp) < 0 ||
656 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
657 fputs(st_el->suffix, fp) < 0)
658 return -1;
659 if (st_el->color && *st_el->color
660 && fputs(GIT_COLOR_RESET, fp) < 0)
661 return -1;
662 }
663 if (!p)
664 return 0;
665 if (fputs(newline, fp) < 0)
666 return -1;
667 count -= p + 1 - buf;
668 buf = p + 1;
669 print = 1;
670 }
671 return 0;
672 }
673
674 /*
675 * '--color-words' algorithm can be described as:
676 *
677 * 1. collect a the minus/plus lines of a diff hunk, divided into
678 * minus-lines and plus-lines;
679 *
680 * 2. break both minus-lines and plus-lines into words and
681 * place them into two mmfile_t with one word for each line;
682 *
683 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
684 *
685 * And for the common parts of the both file, we output the plus side text.
686 * diff_words->current_plus is used to trace the current position of the plus file
687 * which printed. diff_words->last_minus is used to trace the last minus word
688 * printed.
689 *
690 * For '--graph' to work with '--color-words', we need to output the graph prefix
691 * on each line of color words output. Generally, there are two conditions on
692 * which we should output the prefix.
693 *
694 * 1. diff_words->last_minus == 0 &&
695 * diff_words->current_plus == diff_words->plus.text.ptr
696 *
697 * that is: the plus text must start as a new line, and if there is no minus
698 * word printed, a graph prefix must be printed.
699 *
700 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
701 * *(diff_words->current_plus - 1) == '\n'
702 *
703 * that is: a graph prefix must be printed following a '\n'
704 */
705 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
706 {
707 if ((diff_words->last_minus == 0 &&
708 diff_words->current_plus == diff_words->plus.text.ptr) ||
709 (diff_words->current_plus > diff_words->plus.text.ptr &&
710 *(diff_words->current_plus - 1) == '\n')) {
711 return 1;
712 } else {
713 return 0;
714 }
715 }
716
717 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
718 {
719 struct diff_words_data *diff_words = priv;
720 struct diff_words_style *style = diff_words->style;
721 int minus_first, minus_len, plus_first, plus_len;
722 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
723 struct diff_options *opt = diff_words->opt;
724 struct strbuf *msgbuf;
725 char *line_prefix = "";
726
727 if (line[0] != '@' || parse_hunk_header(line, len,
728 &minus_first, &minus_len, &plus_first, &plus_len))
729 return;
730
731 assert(opt);
732 if (opt->output_prefix) {
733 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
734 line_prefix = msgbuf->buf;
735 }
736
737 /* POSIX requires that first be decremented by one if len == 0... */
738 if (minus_len) {
739 minus_begin = diff_words->minus.orig[minus_first].begin;
740 minus_end =
741 diff_words->minus.orig[minus_first + minus_len - 1].end;
742 } else
743 minus_begin = minus_end =
744 diff_words->minus.orig[minus_first].end;
745
746 if (plus_len) {
747 plus_begin = diff_words->plus.orig[plus_first].begin;
748 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
749 } else
750 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
751
752 if (color_words_output_graph_prefix(diff_words)) {
753 fputs(line_prefix, diff_words->opt->file);
754 }
755 if (diff_words->current_plus != plus_begin) {
756 fn_out_diff_words_write_helper(diff_words->opt->file,
757 &style->ctx, style->newline,
758 plus_begin - diff_words->current_plus,
759 diff_words->current_plus, line_prefix);
760 if (*(plus_begin - 1) == '\n')
761 fputs(line_prefix, diff_words->opt->file);
762 }
763 if (minus_begin != minus_end) {
764 fn_out_diff_words_write_helper(diff_words->opt->file,
765 &style->old, style->newline,
766 minus_end - minus_begin, minus_begin,
767 line_prefix);
768 }
769 if (plus_begin != plus_end) {
770 fn_out_diff_words_write_helper(diff_words->opt->file,
771 &style->new, style->newline,
772 plus_end - plus_begin, plus_begin,
773 line_prefix);
774 }
775
776 diff_words->current_plus = plus_end;
777 diff_words->last_minus = minus_first;
778 }
779
780 /* This function starts looking at *begin, and returns 0 iff a word was found. */
781 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
782 int *begin, int *end)
783 {
784 if (word_regex && *begin < buffer->size) {
785 regmatch_t match[1];
786 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
787 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
788 '\n', match[0].rm_eo - match[0].rm_so);
789 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
790 *begin += match[0].rm_so;
791 return *begin >= *end;
792 }
793 return -1;
794 }
795
796 /* find the next word */
797 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
798 (*begin)++;
799 if (*begin >= buffer->size)
800 return -1;
801
802 /* find the end of the word */
803 *end = *begin + 1;
804 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
805 (*end)++;
806
807 return 0;
808 }
809
810 /*
811 * This function splits the words in buffer->text, stores the list with
812 * newline separator into out, and saves the offsets of the original words
813 * in buffer->orig.
814 */
815 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
816 regex_t *word_regex)
817 {
818 int i, j;
819 long alloc = 0;
820
821 out->size = 0;
822 out->ptr = NULL;
823
824 /* fake an empty "0th" word */
825 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
826 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
827 buffer->orig_nr = 1;
828
829 for (i = 0; i < buffer->text.size; i++) {
830 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
831 return;
832
833 /* store original boundaries */
834 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
835 buffer->orig_alloc);
836 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
837 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
838 buffer->orig_nr++;
839
840 /* store one word */
841 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
842 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
843 out->ptr[out->size + j - i] = '\n';
844 out->size += j - i + 1;
845
846 i = j - 1;
847 }
848 }
849
850 /* this executes the word diff on the accumulated buffers */
851 static void diff_words_show(struct diff_words_data *diff_words)
852 {
853 xpparam_t xpp;
854 xdemitconf_t xecfg;
855 mmfile_t minus, plus;
856 struct diff_words_style *style = diff_words->style;
857
858 struct diff_options *opt = diff_words->opt;
859 struct strbuf *msgbuf;
860 char *line_prefix = "";
861
862 assert(opt);
863 if (opt->output_prefix) {
864 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
865 line_prefix = msgbuf->buf;
866 }
867
868 /* special case: only removal */
869 if (!diff_words->plus.text.size) {
870 fputs(line_prefix, diff_words->opt->file);
871 fn_out_diff_words_write_helper(diff_words->opt->file,
872 &style->old, style->newline,
873 diff_words->minus.text.size,
874 diff_words->minus.text.ptr, line_prefix);
875 diff_words->minus.text.size = 0;
876 return;
877 }
878
879 diff_words->current_plus = diff_words->plus.text.ptr;
880 diff_words->last_minus = 0;
881
882 memset(&xpp, 0, sizeof(xpp));
883 memset(&xecfg, 0, sizeof(xecfg));
884 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
885 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
886 xpp.flags = 0;
887 /* as only the hunk header will be parsed, we need a 0-context */
888 xecfg.ctxlen = 0;
889 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
890 &xpp, &xecfg);
891 free(minus.ptr);
892 free(plus.ptr);
893 if (diff_words->current_plus != diff_words->plus.text.ptr +
894 diff_words->plus.text.size) {
895 if (color_words_output_graph_prefix(diff_words))
896 fputs(line_prefix, diff_words->opt->file);
897 fn_out_diff_words_write_helper(diff_words->opt->file,
898 &style->ctx, style->newline,
899 diff_words->plus.text.ptr + diff_words->plus.text.size
900 - diff_words->current_plus, diff_words->current_plus,
901 line_prefix);
902 }
903 diff_words->minus.text.size = diff_words->plus.text.size = 0;
904 }
905
906 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
907 static void diff_words_flush(struct emit_callback *ecbdata)
908 {
909 if (ecbdata->diff_words->minus.text.size ||
910 ecbdata->diff_words->plus.text.size)
911 diff_words_show(ecbdata->diff_words);
912 }
913
914 static void free_diff_words_data(struct emit_callback *ecbdata)
915 {
916 if (ecbdata->diff_words) {
917 diff_words_flush(ecbdata);
918 free (ecbdata->diff_words->minus.text.ptr);
919 free (ecbdata->diff_words->minus.orig);
920 free (ecbdata->diff_words->plus.text.ptr);
921 free (ecbdata->diff_words->plus.orig);
922 free(ecbdata->diff_words->word_regex);
923 free(ecbdata->diff_words);
924 ecbdata->diff_words = NULL;
925 }
926 }
927
928 const char *diff_get_color(int diff_use_color, enum color_diff ix)
929 {
930 if (diff_use_color)
931 return diff_colors[ix];
932 return "";
933 }
934
935 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
936 {
937 const char *cp;
938 unsigned long allot;
939 size_t l = len;
940
941 if (ecb->truncate)
942 return ecb->truncate(line, len);
943 cp = line;
944 allot = l;
945 while (0 < l) {
946 (void) utf8_width(&cp, &l);
947 if (!cp)
948 break; /* truncated in the middle? */
949 }
950 return allot - l;
951 }
952
953 static void find_lno(const char *line, struct emit_callback *ecbdata)
954 {
955 const char *p;
956 ecbdata->lno_in_preimage = 0;
957 ecbdata->lno_in_postimage = 0;
958 p = strchr(line, '-');
959 if (!p)
960 return; /* cannot happen */
961 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
962 p = strchr(p, '+');
963 if (!p)
964 return; /* cannot happen */
965 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
966 }
967
968 static void fn_out_consume(void *priv, char *line, unsigned long len)
969 {
970 struct emit_callback *ecbdata = priv;
971 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
972 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
973 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
974 struct diff_options *o = ecbdata->opt;
975 char *line_prefix = "";
976 struct strbuf *msgbuf;
977
978 if (o && o->output_prefix) {
979 msgbuf = o->output_prefix(o, o->output_prefix_data);
980 line_prefix = msgbuf->buf;
981 }
982
983 if (ecbdata->header) {
984 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
985 strbuf_reset(ecbdata->header);
986 ecbdata->header = NULL;
987 }
988 *(ecbdata->found_changesp) = 1;
989
990 if (ecbdata->label_path[0]) {
991 const char *name_a_tab, *name_b_tab;
992
993 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
994 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
995
996 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
997 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
998 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
999 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1000 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1001 }
1002
1003 if (diff_suppress_blank_empty
1004 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1005 line[0] = '\n';
1006 len = 1;
1007 }
1008
1009 if (line[0] == '@') {
1010 if (ecbdata->diff_words)
1011 diff_words_flush(ecbdata);
1012 len = sane_truncate_line(ecbdata, line, len);
1013 find_lno(line, ecbdata);
1014 emit_hunk_header(ecbdata, line, len);
1015 if (line[len-1] != '\n')
1016 putc('\n', ecbdata->opt->file);
1017 return;
1018 }
1019
1020 if (len < 1) {
1021 emit_line(ecbdata->opt, reset, reset, line, len);
1022 if (ecbdata->diff_words
1023 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1024 fputs("~\n", ecbdata->opt->file);
1025 return;
1026 }
1027
1028 if (ecbdata->diff_words) {
1029 if (line[0] == '-') {
1030 diff_words_append(line, len,
1031 &ecbdata->diff_words->minus);
1032 return;
1033 } else if (line[0] == '+') {
1034 diff_words_append(line, len,
1035 &ecbdata->diff_words->plus);
1036 return;
1037 }
1038 diff_words_flush(ecbdata);
1039 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1040 emit_line(ecbdata->opt, plain, reset, line, len);
1041 fputs("~\n", ecbdata->opt->file);
1042 } else {
1043 /* don't print the prefix character */
1044 emit_line(ecbdata->opt, plain, reset, line+1, len-1);
1045 }
1046 return;
1047 }
1048
1049 if (line[0] != '+') {
1050 const char *color =
1051 diff_get_color(ecbdata->color_diff,
1052 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1053 ecbdata->lno_in_preimage++;
1054 if (line[0] == ' ')
1055 ecbdata->lno_in_postimage++;
1056 emit_line(ecbdata->opt, color, reset, line, len);
1057 } else {
1058 ecbdata->lno_in_postimage++;
1059 emit_add_line(reset, ecbdata, line + 1, len - 1);
1060 }
1061 }
1062
1063 static char *pprint_rename(const char *a, const char *b)
1064 {
1065 const char *old = a;
1066 const char *new = b;
1067 struct strbuf name = STRBUF_INIT;
1068 int pfx_length, sfx_length;
1069 int len_a = strlen(a);
1070 int len_b = strlen(b);
1071 int a_midlen, b_midlen;
1072 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1073 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1074
1075 if (qlen_a || qlen_b) {
1076 quote_c_style(a, &name, NULL, 0);
1077 strbuf_addstr(&name, " => ");
1078 quote_c_style(b, &name, NULL, 0);
1079 return strbuf_detach(&name, NULL);
1080 }
1081
1082 /* Find common prefix */
1083 pfx_length = 0;
1084 while (*old && *new && *old == *new) {
1085 if (*old == '/')
1086 pfx_length = old - a + 1;
1087 old++;
1088 new++;
1089 }
1090
1091 /* Find common suffix */
1092 old = a + len_a;
1093 new = b + len_b;
1094 sfx_length = 0;
1095 while (a <= old && b <= new && *old == *new) {
1096 if (*old == '/')
1097 sfx_length = len_a - (old - a);
1098 old--;
1099 new--;
1100 }
1101
1102 /*
1103 * pfx{mid-a => mid-b}sfx
1104 * {pfx-a => pfx-b}sfx
1105 * pfx{sfx-a => sfx-b}
1106 * name-a => name-b
1107 */
1108 a_midlen = len_a - pfx_length - sfx_length;
1109 b_midlen = len_b - pfx_length - sfx_length;
1110 if (a_midlen < 0)
1111 a_midlen = 0;
1112 if (b_midlen < 0)
1113 b_midlen = 0;
1114
1115 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1116 if (pfx_length + sfx_length) {
1117 strbuf_add(&name, a, pfx_length);
1118 strbuf_addch(&name, '{');
1119 }
1120 strbuf_add(&name, a + pfx_length, a_midlen);
1121 strbuf_addstr(&name, " => ");
1122 strbuf_add(&name, b + pfx_length, b_midlen);
1123 if (pfx_length + sfx_length) {
1124 strbuf_addch(&name, '}');
1125 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1126 }
1127 return strbuf_detach(&name, NULL);
1128 }
1129
1130 struct diffstat_t {
1131 int nr;
1132 int alloc;
1133 struct diffstat_file {
1134 char *from_name;
1135 char *name;
1136 char *print_name;
1137 unsigned is_unmerged:1;
1138 unsigned is_binary:1;
1139 unsigned is_renamed:1;
1140 uintmax_t added, deleted;
1141 } **files;
1142 };
1143
1144 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1145 const char *name_a,
1146 const char *name_b)
1147 {
1148 struct diffstat_file *x;
1149 x = xcalloc(sizeof (*x), 1);
1150 if (diffstat->nr == diffstat->alloc) {
1151 diffstat->alloc = alloc_nr(diffstat->alloc);
1152 diffstat->files = xrealloc(diffstat->files,
1153 diffstat->alloc * sizeof(x));
1154 }
1155 diffstat->files[diffstat->nr++] = x;
1156 if (name_b) {
1157 x->from_name = xstrdup(name_a);
1158 x->name = xstrdup(name_b);
1159 x->is_renamed = 1;
1160 }
1161 else {
1162 x->from_name = NULL;
1163 x->name = xstrdup(name_a);
1164 }
1165 return x;
1166 }
1167
1168 static void diffstat_consume(void *priv, char *line, unsigned long len)
1169 {
1170 struct diffstat_t *diffstat = priv;
1171 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1172
1173 if (line[0] == '+')
1174 x->added++;
1175 else if (line[0] == '-')
1176 x->deleted++;
1177 }
1178
1179 const char mime_boundary_leader[] = "------------";
1180
1181 static int scale_linear(int it, int width, int max_change)
1182 {
1183 /*
1184 * make sure that at least one '-' is printed if there were deletions,
1185 * and likewise for '+'.
1186 */
1187 if (max_change < 2)
1188 return it;
1189 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1190 }
1191
1192 static void show_name(FILE *file,
1193 const char *prefix, const char *name, int len)
1194 {
1195 fprintf(file, " %s%-*s |", prefix, len, name);
1196 }
1197
1198 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1199 {
1200 if (cnt <= 0)
1201 return;
1202 fprintf(file, "%s", set);
1203 while (cnt--)
1204 putc(ch, file);
1205 fprintf(file, "%s", reset);
1206 }
1207
1208 static void fill_print_name(struct diffstat_file *file)
1209 {
1210 char *pname;
1211
1212 if (file->print_name)
1213 return;
1214
1215 if (!file->is_renamed) {
1216 struct strbuf buf = STRBUF_INIT;
1217 if (quote_c_style(file->name, &buf, NULL, 0)) {
1218 pname = strbuf_detach(&buf, NULL);
1219 } else {
1220 pname = file->name;
1221 strbuf_release(&buf);
1222 }
1223 } else {
1224 pname = pprint_rename(file->from_name, file->name);
1225 }
1226 file->print_name = pname;
1227 }
1228
1229 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1230 {
1231 int i, len, add, del, adds = 0, dels = 0;
1232 uintmax_t max_change = 0, max_len = 0;
1233 int total_files = data->nr;
1234 int width, name_width;
1235 const char *reset, *set, *add_c, *del_c;
1236 const char *line_prefix = "";
1237 struct strbuf *msg = NULL;
1238
1239 if (data->nr == 0)
1240 return;
1241
1242 if (options->output_prefix) {
1243 msg = options->output_prefix(options, options->output_prefix_data);
1244 line_prefix = msg->buf;
1245 }
1246
1247 width = options->stat_width ? options->stat_width : 80;
1248 name_width = options->stat_name_width ? options->stat_name_width : 50;
1249
1250 /* Sanity: give at least 5 columns to the graph,
1251 * but leave at least 10 columns for the name.
1252 */
1253 if (width < 25)
1254 width = 25;
1255 if (name_width < 10)
1256 name_width = 10;
1257 else if (width < name_width + 15)
1258 name_width = width - 15;
1259
1260 /* Find the longest filename and max number of changes */
1261 reset = diff_get_color_opt(options, DIFF_RESET);
1262 set = diff_get_color_opt(options, DIFF_PLAIN);
1263 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1264 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1265
1266 for (i = 0; i < data->nr; i++) {
1267 struct diffstat_file *file = data->files[i];
1268 uintmax_t change = file->added + file->deleted;
1269 fill_print_name(file);
1270 len = strlen(file->print_name);
1271 if (max_len < len)
1272 max_len = len;
1273
1274 if (file->is_binary || file->is_unmerged)
1275 continue;
1276 if (max_change < change)
1277 max_change = change;
1278 }
1279
1280 /* Compute the width of the graph part;
1281 * 10 is for one blank at the beginning of the line plus
1282 * " | count " between the name and the graph.
1283 *
1284 * From here on, name_width is the width of the name area,
1285 * and width is the width of the graph area.
1286 */
1287 name_width = (name_width < max_len) ? name_width : max_len;
1288 if (width < (name_width + 10) + max_change)
1289 width = width - (name_width + 10);
1290 else
1291 width = max_change;
1292
1293 for (i = 0; i < data->nr; i++) {
1294 const char *prefix = "";
1295 char *name = data->files[i]->print_name;
1296 uintmax_t added = data->files[i]->added;
1297 uintmax_t deleted = data->files[i]->deleted;
1298 int name_len;
1299
1300 /*
1301 * "scale" the filename
1302 */
1303 len = name_width;
1304 name_len = strlen(name);
1305 if (name_width < name_len) {
1306 char *slash;
1307 prefix = "...";
1308 len -= 3;
1309 name += name_len - len;
1310 slash = strchr(name, '/');
1311 if (slash)
1312 name = slash;
1313 }
1314
1315 if (data->files[i]->is_binary) {
1316 fprintf(options->file, "%s", line_prefix);
1317 show_name(options->file, prefix, name, len);
1318 fprintf(options->file, " Bin ");
1319 fprintf(options->file, "%s%"PRIuMAX"%s",
1320 del_c, deleted, reset);
1321 fprintf(options->file, " -> ");
1322 fprintf(options->file, "%s%"PRIuMAX"%s",
1323 add_c, added, reset);
1324 fprintf(options->file, " bytes");
1325 fprintf(options->file, "\n");
1326 continue;
1327 }
1328 else if (data->files[i]->is_unmerged) {
1329 fprintf(options->file, "%s", line_prefix);
1330 show_name(options->file, prefix, name, len);
1331 fprintf(options->file, " Unmerged\n");
1332 continue;
1333 }
1334 else if (!data->files[i]->is_renamed &&
1335 (added + deleted == 0)) {
1336 total_files--;
1337 continue;
1338 }
1339
1340 /*
1341 * scale the add/delete
1342 */
1343 add = added;
1344 del = deleted;
1345 adds += add;
1346 dels += del;
1347
1348 if (width <= max_change) {
1349 add = scale_linear(add, width, max_change);
1350 del = scale_linear(del, width, max_change);
1351 }
1352 fprintf(options->file, "%s", line_prefix);
1353 show_name(options->file, prefix, name, len);
1354 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1355 added + deleted ? " " : "");
1356 show_graph(options->file, '+', add, add_c, reset);
1357 show_graph(options->file, '-', del, del_c, reset);
1358 fprintf(options->file, "\n");
1359 }
1360 fprintf(options->file, "%s", line_prefix);
1361 fprintf(options->file,
1362 " %d files changed, %d insertions(+), %d deletions(-)\n",
1363 total_files, adds, dels);
1364 }
1365
1366 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1367 {
1368 int i, adds = 0, dels = 0, total_files = data->nr;
1369
1370 if (data->nr == 0)
1371 return;
1372
1373 for (i = 0; i < data->nr; i++) {
1374 if (!data->files[i]->is_binary &&
1375 !data->files[i]->is_unmerged) {
1376 int added = data->files[i]->added;
1377 int deleted= data->files[i]->deleted;
1378 if (!data->files[i]->is_renamed &&
1379 (added + deleted == 0)) {
1380 total_files--;
1381 } else {
1382 adds += added;
1383 dels += deleted;
1384 }
1385 }
1386 }
1387 if (options->output_prefix) {
1388 struct strbuf *msg = NULL;
1389 msg = options->output_prefix(options,
1390 options->output_prefix_data);
1391 fprintf(options->file, "%s", msg->buf);
1392 }
1393 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1394 total_files, adds, dels);
1395 }
1396
1397 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1398 {
1399 int i;
1400
1401 if (data->nr == 0)
1402 return;
1403
1404 for (i = 0; i < data->nr; i++) {
1405 struct diffstat_file *file = data->files[i];
1406
1407 if (options->output_prefix) {
1408 struct strbuf *msg = NULL;
1409 msg = options->output_prefix(options,
1410 options->output_prefix_data);
1411 fprintf(options->file, "%s", msg->buf);
1412 }
1413
1414 if (file->is_binary)
1415 fprintf(options->file, "-\t-\t");
1416 else
1417 fprintf(options->file,
1418 "%"PRIuMAX"\t%"PRIuMAX"\t",
1419 file->added, file->deleted);
1420 if (options->line_termination) {
1421 fill_print_name(file);
1422 if (!file->is_renamed)
1423 write_name_quoted(file->name, options->file,
1424 options->line_termination);
1425 else {
1426 fputs(file->print_name, options->file);
1427 putc(options->line_termination, options->file);
1428 }
1429 } else {
1430 if (file->is_renamed) {
1431 putc('\0', options->file);
1432 write_name_quoted(file->from_name, options->file, '\0');
1433 }
1434 write_name_quoted(file->name, options->file, '\0');
1435 }
1436 }
1437 }
1438
1439 struct dirstat_file {
1440 const char *name;
1441 unsigned long changed;
1442 };
1443
1444 struct dirstat_dir {
1445 struct dirstat_file *files;
1446 int alloc, nr, percent, cumulative;
1447 };
1448
1449 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1450 unsigned long changed, const char *base, int baselen)
1451 {
1452 unsigned long this_dir = 0;
1453 unsigned int sources = 0;
1454 const char *line_prefix = "";
1455 struct strbuf *msg = NULL;
1456
1457 if (opt->output_prefix) {
1458 msg = opt->output_prefix(opt, opt->output_prefix_data);
1459 line_prefix = msg->buf;
1460 }
1461
1462 while (dir->nr) {
1463 struct dirstat_file *f = dir->files;
1464 int namelen = strlen(f->name);
1465 unsigned long this;
1466 char *slash;
1467
1468 if (namelen < baselen)
1469 break;
1470 if (memcmp(f->name, base, baselen))
1471 break;
1472 slash = strchr(f->name + baselen, '/');
1473 if (slash) {
1474 int newbaselen = slash + 1 - f->name;
1475 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1476 sources++;
1477 } else {
1478 this = f->changed;
1479 dir->files++;
1480 dir->nr--;
1481 sources += 2;
1482 }
1483 this_dir += this;
1484 }
1485
1486 /*
1487 * We don't report dirstat's for
1488 * - the top level
1489 * - or cases where everything came from a single directory
1490 * under this directory (sources == 1).
1491 */
1492 if (baselen && sources != 1) {
1493 int permille = this_dir * 1000 / changed;
1494 if (permille) {
1495 int percent = permille / 10;
1496 if (percent >= dir->percent) {
1497 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1498 percent, permille % 10, baselen, base);
1499 if (!dir->cumulative)
1500 return 0;
1501 }
1502 }
1503 }
1504 return this_dir;
1505 }
1506
1507 static int dirstat_compare(const void *_a, const void *_b)
1508 {
1509 const struct dirstat_file *a = _a;
1510 const struct dirstat_file *b = _b;
1511 return strcmp(a->name, b->name);
1512 }
1513
1514 static void show_dirstat(struct diff_options *options)
1515 {
1516 int i;
1517 unsigned long changed;
1518 struct dirstat_dir dir;
1519 struct diff_queue_struct *q = &diff_queued_diff;
1520
1521 dir.files = NULL;
1522 dir.alloc = 0;
1523 dir.nr = 0;
1524 dir.percent = options->dirstat_percent;
1525 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1526
1527 changed = 0;
1528 for (i = 0; i < q->nr; i++) {
1529 struct diff_filepair *p = q->queue[i];
1530 const char *name;
1531 unsigned long copied, added, damage;
1532
1533 name = p->one->path ? p->one->path : p->two->path;
1534
1535 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1536 diff_populate_filespec(p->one, 0);
1537 diff_populate_filespec(p->two, 0);
1538 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1539 &copied, &added);
1540 diff_free_filespec_data(p->one);
1541 diff_free_filespec_data(p->two);
1542 } else if (DIFF_FILE_VALID(p->one)) {
1543 diff_populate_filespec(p->one, 1);
1544 copied = added = 0;
1545 diff_free_filespec_data(p->one);
1546 } else if (DIFF_FILE_VALID(p->two)) {
1547 diff_populate_filespec(p->two, 1);
1548 copied = 0;
1549 added = p->two->size;
1550 diff_free_filespec_data(p->two);
1551 } else
1552 continue;
1553
1554 /*
1555 * Original minus copied is the removed material,
1556 * added is the new material. They are both damages
1557 * made to the preimage. In --dirstat-by-file mode, count
1558 * damaged files, not damaged lines. This is done by
1559 * counting only a single damaged line per file.
1560 */
1561 damage = (p->one->size - copied) + added;
1562 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1563 damage = 1;
1564
1565 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1566 dir.files[dir.nr].name = name;
1567 dir.files[dir.nr].changed = damage;
1568 changed += damage;
1569 dir.nr++;
1570 }
1571
1572 /* This can happen even with many files, if everything was renames */
1573 if (!changed)
1574 return;
1575
1576 /* Show all directories with more than x% of the changes */
1577 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1578 gather_dirstat(options, &dir, changed, "", 0);
1579 }
1580
1581 static void free_diffstat_info(struct diffstat_t *diffstat)
1582 {
1583 int i;
1584 for (i = 0; i < diffstat->nr; i++) {
1585 struct diffstat_file *f = diffstat->files[i];
1586 if (f->name != f->print_name)
1587 free(f->print_name);
1588 free(f->name);
1589 free(f->from_name);
1590 free(f);
1591 }
1592 free(diffstat->files);
1593 }
1594
1595 struct checkdiff_t {
1596 const char *filename;
1597 int lineno;
1598 int conflict_marker_size;
1599 struct diff_options *o;
1600 unsigned ws_rule;
1601 unsigned status;
1602 };
1603
1604 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1605 {
1606 char firstchar;
1607 int cnt;
1608
1609 if (len < marker_size + 1)
1610 return 0;
1611 firstchar = line[0];
1612 switch (firstchar) {
1613 case '=': case '>': case '<': case '|':
1614 break;
1615 default:
1616 return 0;
1617 }
1618 for (cnt = 1; cnt < marker_size; cnt++)
1619 if (line[cnt] != firstchar)
1620 return 0;
1621 /* line[1] thru line[marker_size-1] are same as firstchar */
1622 if (len < marker_size + 1 || !isspace(line[marker_size]))
1623 return 0;
1624 return 1;
1625 }
1626
1627 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1628 {
1629 struct checkdiff_t *data = priv;
1630 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1631 int marker_size = data->conflict_marker_size;
1632 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1633 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1634 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1635 char *err;
1636 char *line_prefix = "";
1637 struct strbuf *msgbuf;
1638
1639 assert(data->o);
1640 if (data->o->output_prefix) {
1641 msgbuf = data->o->output_prefix(data->o,
1642 data->o->output_prefix_data);
1643 line_prefix = msgbuf->buf;
1644 }
1645
1646 if (line[0] == '+') {
1647 unsigned bad;
1648 data->lineno++;
1649 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1650 data->status |= 1;
1651 fprintf(data->o->file,
1652 "%s%s:%d: leftover conflict marker\n",
1653 line_prefix, data->filename, data->lineno);
1654 }
1655 bad = ws_check(line + 1, len - 1, data->ws_rule);
1656 if (!bad)
1657 return;
1658 data->status |= bad;
1659 err = whitespace_error_string(bad);
1660 fprintf(data->o->file, "%s%s:%d: %s.\n",
1661 line_prefix, data->filename, data->lineno, err);
1662 free(err);
1663 emit_line(data->o, set, reset, line, 1);
1664 ws_check_emit(line + 1, len - 1, data->ws_rule,
1665 data->o->file, set, reset, ws);
1666 } else if (line[0] == ' ') {
1667 data->lineno++;
1668 } else if (line[0] == '@') {
1669 char *plus = strchr(line, '+');
1670 if (plus)
1671 data->lineno = strtol(plus, NULL, 10) - 1;
1672 else
1673 die("invalid diff");
1674 }
1675 }
1676
1677 static unsigned char *deflate_it(char *data,
1678 unsigned long size,
1679 unsigned long *result_size)
1680 {
1681 int bound;
1682 unsigned char *deflated;
1683 z_stream stream;
1684
1685 memset(&stream, 0, sizeof(stream));
1686 deflateInit(&stream, zlib_compression_level);
1687 bound = deflateBound(&stream, size);
1688 deflated = xmalloc(bound);
1689 stream.next_out = deflated;
1690 stream.avail_out = bound;
1691
1692 stream.next_in = (unsigned char *)data;
1693 stream.avail_in = size;
1694 while (deflate(&stream, Z_FINISH) == Z_OK)
1695 ; /* nothing */
1696 deflateEnd(&stream);
1697 *result_size = stream.total_out;
1698 return deflated;
1699 }
1700
1701 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1702 {
1703 void *cp;
1704 void *delta;
1705 void *deflated;
1706 void *data;
1707 unsigned long orig_size;
1708 unsigned long delta_size;
1709 unsigned long deflate_size;
1710 unsigned long data_size;
1711
1712 /* We could do deflated delta, or we could do just deflated two,
1713 * whichever is smaller.
1714 */
1715 delta = NULL;
1716 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1717 if (one->size && two->size) {
1718 delta = diff_delta(one->ptr, one->size,
1719 two->ptr, two->size,
1720 &delta_size, deflate_size);
1721 if (delta) {
1722 void *to_free = delta;
1723 orig_size = delta_size;
1724 delta = deflate_it(delta, delta_size, &delta_size);
1725 free(to_free);
1726 }
1727 }
1728
1729 if (delta && delta_size < deflate_size) {
1730 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1731 free(deflated);
1732 data = delta;
1733 data_size = delta_size;
1734 }
1735 else {
1736 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1737 free(delta);
1738 data = deflated;
1739 data_size = deflate_size;
1740 }
1741
1742 /* emit data encoded in base85 */
1743 cp = data;
1744 while (data_size) {
1745 int bytes = (52 < data_size) ? 52 : data_size;
1746 char line[70];
1747 data_size -= bytes;
1748 if (bytes <= 26)
1749 line[0] = bytes + 'A' - 1;
1750 else
1751 line[0] = bytes - 26 + 'a' - 1;
1752 encode_85(line + 1, cp, bytes);
1753 cp = (char *) cp + bytes;
1754 fprintf(file, "%s", prefix);
1755 fputs(line, file);
1756 fputc('\n', file);
1757 }
1758 fprintf(file, "%s\n", prefix);
1759 free(data);
1760 }
1761
1762 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1763 {
1764 fprintf(file, "%sGIT binary patch\n", prefix);
1765 emit_binary_diff_body(file, one, two, prefix);
1766 emit_binary_diff_body(file, two, one, prefix);
1767 }
1768
1769 static void diff_filespec_load_driver(struct diff_filespec *one)
1770 {
1771 if (!one->driver)
1772 one->driver = userdiff_find_by_path(one->path);
1773 if (!one->driver)
1774 one->driver = userdiff_find_by_name("default");
1775 }
1776
1777 int diff_filespec_is_binary(struct diff_filespec *one)
1778 {
1779 if (one->is_binary == -1) {
1780 diff_filespec_load_driver(one);
1781 if (one->driver->binary != -1)
1782 one->is_binary = one->driver->binary;
1783 else {
1784 if (!one->data && DIFF_FILE_VALID(one))
1785 diff_populate_filespec(one, 0);
1786 if (one->data)
1787 one->is_binary = buffer_is_binary(one->data,
1788 one->size);
1789 if (one->is_binary == -1)
1790 one->is_binary = 0;
1791 }
1792 }
1793 return one->is_binary;
1794 }
1795
1796 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1797 {
1798 diff_filespec_load_driver(one);
1799 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1800 }
1801
1802 static const char *userdiff_word_regex(struct diff_filespec *one)
1803 {
1804 diff_filespec_load_driver(one);
1805 return one->driver->word_regex;
1806 }
1807
1808 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1809 {
1810 if (!options->a_prefix)
1811 options->a_prefix = a;
1812 if (!options->b_prefix)
1813 options->b_prefix = b;
1814 }
1815
1816 struct userdiff_driver *get_textconv(struct diff_filespec *one)
1817 {
1818 if (!DIFF_FILE_VALID(one))
1819 return NULL;
1820 if (!S_ISREG(one->mode))
1821 return NULL;
1822 diff_filespec_load_driver(one);
1823 if (!one->driver->textconv)
1824 return NULL;
1825
1826 if (one->driver->textconv_want_cache && !one->driver->textconv_cache) {
1827 struct notes_cache *c = xmalloc(sizeof(*c));
1828 struct strbuf name = STRBUF_INIT;
1829
1830 strbuf_addf(&name, "textconv/%s", one->driver->name);
1831 notes_cache_init(c, name.buf, one->driver->textconv);
1832 one->driver->textconv_cache = c;
1833 }
1834
1835 return one->driver;
1836 }
1837
1838 static void builtin_diff(const char *name_a,
1839 const char *name_b,
1840 struct diff_filespec *one,
1841 struct diff_filespec *two,
1842 const char *xfrm_msg,
1843 int must_show_header,
1844 struct diff_options *o,
1845 int complete_rewrite)
1846 {
1847 mmfile_t mf1, mf2;
1848 const char *lbl[2];
1849 char *a_one, *b_two;
1850 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1851 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1852 const char *a_prefix, *b_prefix;
1853 struct userdiff_driver *textconv_one = NULL;
1854 struct userdiff_driver *textconv_two = NULL;
1855 struct strbuf header = STRBUF_INIT;
1856 struct strbuf *msgbuf;
1857 char *line_prefix = "";
1858
1859 if (o->output_prefix) {
1860 msgbuf = o->output_prefix(o, o->output_prefix_data);
1861 line_prefix = msgbuf->buf;
1862 }
1863
1864 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1865 (!one->mode || S_ISGITLINK(one->mode)) &&
1866 (!two->mode || S_ISGITLINK(two->mode))) {
1867 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1868 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1869 show_submodule_summary(o->file, one ? one->path : two->path,
1870 one->sha1, two->sha1, two->dirty_submodule,
1871 del, add, reset);
1872 return;
1873 }
1874
1875 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1876 textconv_one = get_textconv(one);
1877 textconv_two = get_textconv(two);
1878 }
1879
1880 diff_set_mnemonic_prefix(o, "a/", "b/");
1881 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1882 a_prefix = o->b_prefix;
1883 b_prefix = o->a_prefix;
1884 } else {
1885 a_prefix = o->a_prefix;
1886 b_prefix = o->b_prefix;
1887 }
1888
1889 /* Never use a non-valid filename anywhere if at all possible */
1890 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1891 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1892
1893 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1894 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1895 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1896 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1897 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
1898 if (lbl[0][0] == '/') {
1899 /* /dev/null */
1900 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
1901 if (xfrm_msg)
1902 strbuf_addstr(&header, xfrm_msg);
1903 must_show_header = 1;
1904 }
1905 else if (lbl[1][0] == '/') {
1906 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
1907 if (xfrm_msg)
1908 strbuf_addstr(&header, xfrm_msg);
1909 must_show_header = 1;
1910 }
1911 else {
1912 if (one->mode != two->mode) {
1913 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
1914 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
1915 must_show_header = 1;
1916 }
1917 if (xfrm_msg)
1918 strbuf_addstr(&header, xfrm_msg);
1919
1920 /*
1921 * we do not run diff between different kind
1922 * of objects.
1923 */
1924 if ((one->mode ^ two->mode) & S_IFMT)
1925 goto free_ab_and_return;
1926 if (complete_rewrite &&
1927 (textconv_one || !diff_filespec_is_binary(one)) &&
1928 (textconv_two || !diff_filespec_is_binary(two))) {
1929 fprintf(o->file, "%s", header.buf);
1930 strbuf_reset(&header);
1931 emit_rewrite_diff(name_a, name_b, one, two,
1932 textconv_one, textconv_two, o);
1933 o->found_changes = 1;
1934 goto free_ab_and_return;
1935 }
1936 }
1937
1938 if (!DIFF_OPT_TST(o, TEXT) &&
1939 ( (!textconv_one && diff_filespec_is_binary(one)) ||
1940 (!textconv_two && diff_filespec_is_binary(two)) )) {
1941 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1942 die("unable to read files to diff");
1943 /* Quite common confusing case */
1944 if (mf1.size == mf2.size &&
1945 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
1946 if (must_show_header)
1947 fprintf(o->file, "%s", header.buf);
1948 goto free_ab_and_return;
1949 }
1950 fprintf(o->file, "%s", header.buf);
1951 strbuf_reset(&header);
1952 if (DIFF_OPT_TST(o, BINARY))
1953 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
1954 else
1955 fprintf(o->file, "%sBinary files %s and %s differ\n",
1956 line_prefix, lbl[0], lbl[1]);
1957 o->found_changes = 1;
1958 }
1959 else {
1960 /* Crazy xdl interfaces.. */
1961 const char *diffopts = getenv("GIT_DIFF_OPTS");
1962 xpparam_t xpp;
1963 xdemitconf_t xecfg;
1964 struct emit_callback ecbdata;
1965 const struct userdiff_funcname *pe;
1966
1967 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
1968 fprintf(o->file, "%s", header.buf);
1969 strbuf_reset(&header);
1970 }
1971
1972 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
1973 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
1974
1975 pe = diff_funcname_pattern(one);
1976 if (!pe)
1977 pe = diff_funcname_pattern(two);
1978
1979 memset(&xpp, 0, sizeof(xpp));
1980 memset(&xecfg, 0, sizeof(xecfg));
1981 memset(&ecbdata, 0, sizeof(ecbdata));
1982 ecbdata.label_path = lbl;
1983 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1984 ecbdata.found_changesp = &o->found_changes;
1985 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1986 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1987 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1988 ecbdata.opt = o;
1989 ecbdata.header = header.len ? &header : NULL;
1990 xpp.flags = o->xdl_opts;
1991 xecfg.ctxlen = o->context;
1992 xecfg.interhunkctxlen = o->interhunkcontext;
1993 xecfg.flags = XDL_EMIT_FUNCNAMES;
1994 if (pe)
1995 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1996 if (!diffopts)
1997 ;
1998 else if (!prefixcmp(diffopts, "--unified="))
1999 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2000 else if (!prefixcmp(diffopts, "-u"))
2001 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2002 if (o->word_diff) {
2003 int i;
2004
2005 ecbdata.diff_words =
2006 xcalloc(1, sizeof(struct diff_words_data));
2007 ecbdata.diff_words->type = o->word_diff;
2008 ecbdata.diff_words->opt = o;
2009 if (!o->word_regex)
2010 o->word_regex = userdiff_word_regex(one);
2011 if (!o->word_regex)
2012 o->word_regex = userdiff_word_regex(two);
2013 if (!o->word_regex)
2014 o->word_regex = diff_word_regex_cfg;
2015 if (o->word_regex) {
2016 ecbdata.diff_words->word_regex = (regex_t *)
2017 xmalloc(sizeof(regex_t));
2018 if (regcomp(ecbdata.diff_words->word_regex,
2019 o->word_regex,
2020 REG_EXTENDED | REG_NEWLINE))
2021 die ("Invalid regular expression: %s",
2022 o->word_regex);
2023 }
2024 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2025 if (o->word_diff == diff_words_styles[i].type) {
2026 ecbdata.diff_words->style =
2027 &diff_words_styles[i];
2028 break;
2029 }
2030 }
2031 if (DIFF_OPT_TST(o, COLOR_DIFF)) {
2032 struct diff_words_style *st = ecbdata.diff_words->style;
2033 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2034 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2035 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2036 }
2037 }
2038 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2039 &xpp, &xecfg);
2040 if (o->word_diff)
2041 free_diff_words_data(&ecbdata);
2042 if (textconv_one)
2043 free(mf1.ptr);
2044 if (textconv_two)
2045 free(mf2.ptr);
2046 xdiff_clear_find_func(&xecfg);
2047 }
2048
2049 free_ab_and_return:
2050 strbuf_release(&header);
2051 diff_free_filespec_data(one);
2052 diff_free_filespec_data(two);
2053 free(a_one);
2054 free(b_two);
2055 return;
2056 }
2057
2058 static void builtin_diffstat(const char *name_a, const char *name_b,
2059 struct diff_filespec *one,
2060 struct diff_filespec *two,
2061 struct diffstat_t *diffstat,
2062 struct diff_options *o,
2063 int complete_rewrite)
2064 {
2065 mmfile_t mf1, mf2;
2066 struct diffstat_file *data;
2067
2068 data = diffstat_add(diffstat, name_a, name_b);
2069
2070 if (!one || !two) {
2071 data->is_unmerged = 1;
2072 return;
2073 }
2074 if (complete_rewrite) {
2075 diff_populate_filespec(one, 0);
2076 diff_populate_filespec(two, 0);
2077 data->deleted = count_lines(one->data, one->size);
2078 data->added = count_lines(two->data, two->size);
2079 goto free_and_return;
2080 }
2081 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2082 die("unable to read files to diff");
2083
2084 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2085 data->is_binary = 1;
2086 data->added = mf2.size;
2087 data->deleted = mf1.size;
2088 } else {
2089 /* Crazy xdl interfaces.. */
2090 xpparam_t xpp;
2091 xdemitconf_t xecfg;
2092
2093 memset(&xpp, 0, sizeof(xpp));
2094 memset(&xecfg, 0, sizeof(xecfg));
2095 xpp.flags = o->xdl_opts;
2096 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2097 &xpp, &xecfg);
2098 }
2099
2100 free_and_return:
2101 diff_free_filespec_data(one);
2102 diff_free_filespec_data(two);
2103 }
2104
2105 static void builtin_checkdiff(const char *name_a, const char *name_b,
2106 const char *attr_path,
2107 struct diff_filespec *one,
2108 struct diff_filespec *two,
2109 struct diff_options *o)
2110 {
2111 mmfile_t mf1, mf2;
2112 struct checkdiff_t data;
2113
2114 if (!two)
2115 return;
2116
2117 memset(&data, 0, sizeof(data));
2118 data.filename = name_b ? name_b : name_a;
2119 data.lineno = 0;
2120 data.o = o;
2121 data.ws_rule = whitespace_rule(attr_path);
2122 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2123
2124 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2125 die("unable to read files to diff");
2126
2127 /*
2128 * All the other codepaths check both sides, but not checking
2129 * the "old" side here is deliberate. We are checking the newly
2130 * introduced changes, and as long as the "new" side is text, we
2131 * can and should check what it introduces.
2132 */
2133 if (diff_filespec_is_binary(two))
2134 goto free_and_return;
2135 else {
2136 /* Crazy xdl interfaces.. */
2137 xpparam_t xpp;
2138 xdemitconf_t xecfg;
2139
2140 memset(&xpp, 0, sizeof(xpp));
2141 memset(&xecfg, 0, sizeof(xecfg));
2142 xecfg.ctxlen = 1; /* at least one context line */
2143 xpp.flags = 0;
2144 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2145 &xpp, &xecfg);
2146
2147 if (data.ws_rule & WS_BLANK_AT_EOF) {
2148 struct emit_callback ecbdata;
2149 int blank_at_eof;
2150
2151 ecbdata.ws_rule = data.ws_rule;
2152 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2153 blank_at_eof = ecbdata.blank_at_eof_in_preimage;
2154
2155 if (blank_at_eof) {
2156 static char *err;
2157 if (!err)
2158 err = whitespace_error_string(WS_BLANK_AT_EOF);
2159 fprintf(o->file, "%s:%d: %s.\n",
2160 data.filename, blank_at_eof, err);
2161 data.status = 1; /* report errors */
2162 }
2163 }
2164 }
2165 free_and_return:
2166 diff_free_filespec_data(one);
2167 diff_free_filespec_data(two);
2168 if (data.status)
2169 DIFF_OPT_SET(o, CHECK_FAILED);
2170 }
2171
2172 struct diff_filespec *alloc_filespec(const char *path)
2173 {
2174 int namelen = strlen(path);
2175 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2176
2177 memset(spec, 0, sizeof(*spec));
2178 spec->path = (char *)(spec + 1);
2179 memcpy(spec->path, path, namelen+1);
2180 spec->count = 1;
2181 spec->is_binary = -1;
2182 return spec;
2183 }
2184
2185 void free_filespec(struct diff_filespec *spec)
2186 {
2187 if (!--spec->count) {
2188 diff_free_filespec_data(spec);
2189 free(spec);
2190 }
2191 }
2192
2193 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2194 unsigned short mode)
2195 {
2196 if (mode) {
2197 spec->mode = canon_mode(mode);
2198 hashcpy(spec->sha1, sha1);
2199 spec->sha1_valid = !is_null_sha1(sha1);
2200 }
2201 }
2202
2203 /*
2204 * Given a name and sha1 pair, if the index tells us the file in
2205 * the work tree has that object contents, return true, so that
2206 * prepare_temp_file() does not have to inflate and extract.
2207 */
2208 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2209 {
2210 struct cache_entry *ce;
2211 struct stat st;
2212 int pos, len;
2213
2214 /*
2215 * We do not read the cache ourselves here, because the
2216 * benchmark with my previous version that always reads cache
2217 * shows that it makes things worse for diff-tree comparing
2218 * two linux-2.6 kernel trees in an already checked out work
2219 * tree. This is because most diff-tree comparisons deal with
2220 * only a small number of files, while reading the cache is
2221 * expensive for a large project, and its cost outweighs the
2222 * savings we get by not inflating the object to a temporary
2223 * file. Practically, this code only helps when we are used
2224 * by diff-cache --cached, which does read the cache before
2225 * calling us.
2226 */
2227 if (!active_cache)
2228 return 0;
2229
2230 /* We want to avoid the working directory if our caller
2231 * doesn't need the data in a normal file, this system
2232 * is rather slow with its stat/open/mmap/close syscalls,
2233 * and the object is contained in a pack file. The pack
2234 * is probably already open and will be faster to obtain
2235 * the data through than the working directory. Loose
2236 * objects however would tend to be slower as they need
2237 * to be individually opened and inflated.
2238 */
2239 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2240 return 0;
2241
2242 len = strlen(name);
2243 pos = cache_name_pos(name, len);
2244 if (pos < 0)
2245 return 0;
2246 ce = active_cache[pos];
2247
2248 /*
2249 * This is not the sha1 we are looking for, or
2250 * unreusable because it is not a regular file.
2251 */
2252 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2253 return 0;
2254
2255 /*
2256 * If ce is marked as "assume unchanged", there is no
2257 * guarantee that work tree matches what we are looking for.
2258 */
2259 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2260 return 0;
2261
2262 /*
2263 * If ce matches the file in the work tree, we can reuse it.
2264 */
2265 if (ce_uptodate(ce) ||
2266 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2267 return 1;
2268
2269 return 0;
2270 }
2271
2272 static int populate_from_stdin(struct diff_filespec *s)
2273 {
2274 struct strbuf buf = STRBUF_INIT;
2275 size_t size = 0;
2276
2277 if (strbuf_read(&buf, 0, 0) < 0)
2278 return error("error while reading from stdin %s",
2279 strerror(errno));
2280
2281 s->should_munmap = 0;
2282 s->data = strbuf_detach(&buf, &size);
2283 s->size = size;
2284 s->should_free = 1;
2285 return 0;
2286 }
2287
2288 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2289 {
2290 int len;
2291 char *data = xmalloc(100), *dirty = "";
2292
2293 /* Are we looking at the work tree? */
2294 if (s->dirty_submodule)
2295 dirty = "-dirty";
2296
2297 len = snprintf(data, 100,
2298 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2299 s->data = data;
2300 s->size = len;
2301 s->should_free = 1;
2302 if (size_only) {
2303 s->data = NULL;
2304 free(data);
2305 }
2306 return 0;
2307 }
2308
2309 /*
2310 * While doing rename detection and pickaxe operation, we may need to
2311 * grab the data for the blob (or file) for our own in-core comparison.
2312 * diff_filespec has data and size fields for this purpose.
2313 */
2314 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2315 {
2316 int err = 0;
2317 if (!DIFF_FILE_VALID(s))
2318 die("internal error: asking to populate invalid file.");
2319 if (S_ISDIR(s->mode))
2320 return -1;
2321
2322 if (s->data)
2323 return 0;
2324
2325 if (size_only && 0 < s->size)
2326 return 0;
2327
2328 if (S_ISGITLINK(s->mode))
2329 return diff_populate_gitlink(s, size_only);
2330
2331 if (!s->sha1_valid ||
2332 reuse_worktree_file(s->path, s->sha1, 0)) {
2333 struct strbuf buf = STRBUF_INIT;
2334 struct stat st;
2335 int fd;
2336
2337 if (!strcmp(s->path, "-"))
2338 return populate_from_stdin(s);
2339
2340 if (lstat(s->path, &st) < 0) {
2341 if (errno == ENOENT) {
2342 err_empty:
2343 err = -1;
2344 empty:
2345 s->data = (char *)"";
2346 s->size = 0;
2347 return err;
2348 }
2349 }
2350 s->size = xsize_t(st.st_size);
2351 if (!s->size)
2352 goto empty;
2353 if (S_ISLNK(st.st_mode)) {
2354 struct strbuf sb = STRBUF_INIT;
2355
2356 if (strbuf_readlink(&sb, s->path, s->size))
2357 goto err_empty;
2358 s->size = sb.len;
2359 s->data = strbuf_detach(&sb, NULL);
2360 s->should_free = 1;
2361 return 0;
2362 }
2363 if (size_only)
2364 return 0;
2365 fd = open(s->path, O_RDONLY);
2366 if (fd < 0)
2367 goto err_empty;
2368 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2369 close(fd);
2370 s->should_munmap = 1;
2371
2372 /*
2373 * Convert from working tree format to canonical git format
2374 */
2375 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2376 size_t size = 0;
2377 munmap(s->data, s->size);
2378 s->should_munmap = 0;
2379 s->data = strbuf_detach(&buf, &size);
2380 s->size = size;
2381 s->should_free = 1;
2382 }
2383 }
2384 else {
2385 enum object_type type;
2386 if (size_only)
2387 type = sha1_object_info(s->sha1, &s->size);
2388 else {
2389 s->data = read_sha1_file(s->sha1, &type, &s->size);
2390 s->should_free = 1;
2391 }
2392 }
2393 return 0;
2394 }
2395
2396 void diff_free_filespec_blob(struct diff_filespec *s)
2397 {
2398 if (s->should_free)
2399 free(s->data);
2400 else if (s->should_munmap)
2401 munmap(s->data, s->size);
2402
2403 if (s->should_free || s->should_munmap) {
2404 s->should_free = s->should_munmap = 0;
2405 s->data = NULL;
2406 }
2407 }
2408
2409 void diff_free_filespec_data(struct diff_filespec *s)
2410 {
2411 diff_free_filespec_blob(s);
2412 free(s->cnt_data);
2413 s->cnt_data = NULL;
2414 }
2415
2416 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2417 void *blob,
2418 unsigned long size,
2419 const unsigned char *sha1,
2420 int mode)
2421 {
2422 int fd;
2423 struct strbuf buf = STRBUF_INIT;
2424 struct strbuf template = STRBUF_INIT;
2425 char *path_dup = xstrdup(path);
2426 const char *base = basename(path_dup);
2427
2428 /* Generate "XXXXXX_basename.ext" */
2429 strbuf_addstr(&template, "XXXXXX_");
2430 strbuf_addstr(&template, base);
2431
2432 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2433 strlen(base) + 1);
2434 if (fd < 0)
2435 die_errno("unable to create temp-file");
2436 if (convert_to_working_tree(path,
2437 (const char *)blob, (size_t)size, &buf)) {
2438 blob = buf.buf;
2439 size = buf.len;
2440 }
2441 if (write_in_full(fd, blob, size) != size)
2442 die_errno("unable to write temp-file");
2443 close(fd);
2444 temp->name = temp->tmp_path;
2445 strcpy(temp->hex, sha1_to_hex(sha1));
2446 temp->hex[40] = 0;
2447 sprintf(temp->mode, "%06o", mode);
2448 strbuf_release(&buf);
2449 strbuf_release(&template);
2450 free(path_dup);
2451 }
2452
2453 static struct diff_tempfile *prepare_temp_file(const char *name,
2454 struct diff_filespec *one)
2455 {
2456 struct diff_tempfile *temp = claim_diff_tempfile();
2457
2458 if (!DIFF_FILE_VALID(one)) {
2459 not_a_valid_file:
2460 /* A '-' entry produces this for file-2, and
2461 * a '+' entry produces this for file-1.
2462 */
2463 temp->name = "/dev/null";
2464 strcpy(temp->hex, ".");
2465 strcpy(temp->mode, ".");
2466 return temp;
2467 }
2468
2469 if (!remove_tempfile_installed) {
2470 atexit(remove_tempfile);
2471 sigchain_push_common(remove_tempfile_on_signal);
2472 remove_tempfile_installed = 1;
2473 }
2474
2475 if (!one->sha1_valid ||
2476 reuse_worktree_file(name, one->sha1, 1)) {
2477 struct stat st;
2478 if (lstat(name, &st) < 0) {
2479 if (errno == ENOENT)
2480 goto not_a_valid_file;
2481 die_errno("stat(%s)", name);
2482 }
2483 if (S_ISLNK(st.st_mode)) {
2484 struct strbuf sb = STRBUF_INIT;
2485 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2486 die_errno("readlink(%s)", name);
2487 prep_temp_blob(name, temp, sb.buf, sb.len,
2488 (one->sha1_valid ?
2489 one->sha1 : null_sha1),
2490 (one->sha1_valid ?
2491 one->mode : S_IFLNK));
2492 strbuf_release(&sb);
2493 }
2494 else {
2495 /* we can borrow from the file in the work tree */
2496 temp->name = name;
2497 if (!one->sha1_valid)
2498 strcpy(temp->hex, sha1_to_hex(null_sha1));
2499 else
2500 strcpy(temp->hex, sha1_to_hex(one->sha1));
2501 /* Even though we may sometimes borrow the
2502 * contents from the work tree, we always want
2503 * one->mode. mode is trustworthy even when
2504 * !(one->sha1_valid), as long as
2505 * DIFF_FILE_VALID(one).
2506 */
2507 sprintf(temp->mode, "%06o", one->mode);
2508 }
2509 return temp;
2510 }
2511 else {
2512 if (diff_populate_filespec(one, 0))
2513 die("cannot read data blob for %s", one->path);
2514 prep_temp_blob(name, temp, one->data, one->size,
2515 one->sha1, one->mode);
2516 }
2517 return temp;
2518 }
2519
2520 /* An external diff command takes:
2521 *
2522 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2523 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2524 *
2525 */
2526 static void run_external_diff(const char *pgm,
2527 const char *name,
2528 const char *other,
2529 struct diff_filespec *one,
2530 struct diff_filespec *two,
2531 const char *xfrm_msg,
2532 int complete_rewrite)
2533 {
2534 const char *spawn_arg[10];
2535 int retval;
2536 const char **arg = &spawn_arg[0];
2537
2538 if (one && two) {
2539 struct diff_tempfile *temp_one, *temp_two;
2540 const char *othername = (other ? other : name);
2541 temp_one = prepare_temp_file(name, one);
2542 temp_two = prepare_temp_file(othername, two);
2543 *arg++ = pgm;
2544 *arg++ = name;
2545 *arg++ = temp_one->name;
2546 *arg++ = temp_one->hex;
2547 *arg++ = temp_one->mode;
2548 *arg++ = temp_two->name;
2549 *arg++ = temp_two->hex;
2550 *arg++ = temp_two->mode;
2551 if (other) {
2552 *arg++ = other;
2553 *arg++ = xfrm_msg;
2554 }
2555 } else {
2556 *arg++ = pgm;
2557 *arg++ = name;
2558 }
2559 *arg = NULL;
2560 fflush(NULL);
2561 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2562 remove_tempfile();
2563 if (retval) {
2564 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2565 exit(1);
2566 }
2567 }
2568
2569 static int similarity_index(struct diff_filepair *p)
2570 {
2571 return p->score * 100 / MAX_SCORE;
2572 }
2573
2574 static void fill_metainfo(struct strbuf *msg,
2575 const char *name,
2576 const char *other,
2577 struct diff_filespec *one,
2578 struct diff_filespec *two,
2579 struct diff_options *o,
2580 struct diff_filepair *p,
2581 int *must_show_header,
2582 int use_color)
2583 {
2584 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2585 const char *reset = diff_get_color(use_color, DIFF_RESET);
2586 struct strbuf *msgbuf;
2587 char *line_prefix = "";
2588
2589 *must_show_header = 1;
2590 if (o->output_prefix) {
2591 msgbuf = o->output_prefix(o, o->output_prefix_data);
2592 line_prefix = msgbuf->buf;
2593 }
2594 strbuf_init(msg, PATH_MAX * 2 + 300);
2595 switch (p->status) {
2596 case DIFF_STATUS_COPIED:
2597 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2598 line_prefix, set, similarity_index(p));
2599 strbuf_addf(msg, "%s\n%s%scopy from ",
2600 reset, line_prefix, set);
2601 quote_c_style(name, msg, NULL, 0);
2602 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2603 quote_c_style(other, msg, NULL, 0);
2604 strbuf_addf(msg, "%s\n", reset);
2605 break;
2606 case DIFF_STATUS_RENAMED:
2607 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2608 line_prefix, set, similarity_index(p));
2609 strbuf_addf(msg, "%s\n%s%srename from ",
2610 reset, line_prefix, set);
2611 quote_c_style(name, msg, NULL, 0);
2612 strbuf_addf(msg, "%s\n%s%srename to ",
2613 reset, line_prefix, set);
2614 quote_c_style(other, msg, NULL, 0);
2615 strbuf_addf(msg, "%s\n", reset);
2616 break;
2617 case DIFF_STATUS_MODIFIED:
2618 if (p->score) {
2619 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2620 line_prefix,
2621 set, similarity_index(p), reset);
2622 break;
2623 }
2624 /* fallthru */
2625 default:
2626 *must_show_header = 0;
2627 }
2628 if (one && two && hashcmp(one->sha1, two->sha1)) {
2629 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2630
2631 if (DIFF_OPT_TST(o, BINARY)) {
2632 mmfile_t mf;
2633 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2634 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2635 abbrev = 40;
2636 }
2637 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2638 find_unique_abbrev(one->sha1, abbrev));
2639 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2640 if (one->mode == two->mode)
2641 strbuf_addf(msg, " %06o", one->mode);
2642 strbuf_addf(msg, "%s\n", reset);
2643 }
2644 }
2645
2646 static void run_diff_cmd(const char *pgm,
2647 const char *name,
2648 const char *other,
2649 const char *attr_path,
2650 struct diff_filespec *one,
2651 struct diff_filespec *two,
2652 struct strbuf *msg,
2653 struct diff_options *o,
2654 struct diff_filepair *p)
2655 {
2656 const char *xfrm_msg = NULL;
2657 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2658 int must_show_header = 0;
2659
2660 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2661 pgm = NULL;
2662 else {
2663 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2664 if (drv && drv->external)
2665 pgm = drv->external;
2666 }
2667
2668 if (msg) {
2669 /*
2670 * don't use colors when the header is intended for an
2671 * external diff driver
2672 */
2673 fill_metainfo(msg, name, other, one, two, o, p,
2674 &must_show_header,
2675 DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
2676 xfrm_msg = msg->len ? msg->buf : NULL;
2677 }
2678
2679 if (pgm) {
2680 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2681 complete_rewrite);
2682 return;
2683 }
2684 if (one && two)
2685 builtin_diff(name, other ? other : name,
2686 one, two, xfrm_msg, must_show_header,
2687 o, complete_rewrite);
2688 else
2689 fprintf(o->file, "* Unmerged path %s\n", name);
2690 }
2691
2692 static void diff_fill_sha1_info(struct diff_filespec *one)
2693 {
2694 if (DIFF_FILE_VALID(one)) {
2695 if (!one->sha1_valid) {
2696 struct stat st;
2697 if (!strcmp(one->path, "-")) {
2698 hashcpy(one->sha1, null_sha1);
2699 return;
2700 }
2701 if (lstat(one->path, &st) < 0)
2702 die_errno("stat '%s'", one->path);
2703 if (index_path(one->sha1, one->path, &st, 0))
2704 die("cannot hash %s", one->path);
2705 }
2706 }
2707 else
2708 hashclr(one->sha1);
2709 }
2710
2711 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2712 {
2713 /* Strip the prefix but do not molest /dev/null and absolute paths */
2714 if (*namep && **namep != '/') {
2715 *namep += prefix_length;
2716 if (**namep == '/')
2717 ++*namep;
2718 }
2719 if (*otherp && **otherp != '/') {
2720 *otherp += prefix_length;
2721 if (**otherp == '/')
2722 ++*otherp;
2723 }
2724 }
2725
2726 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2727 {
2728 const char *pgm = external_diff();
2729 struct strbuf msg;
2730 struct diff_filespec *one = p->one;
2731 struct diff_filespec *two = p->two;
2732 const char *name;
2733 const char *other;
2734 const char *attr_path;
2735
2736 name = p->one->path;
2737 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2738 attr_path = name;
2739 if (o->prefix_length)
2740 strip_prefix(o->prefix_length, &name, &other);
2741
2742 if (DIFF_PAIR_UNMERGED(p)) {
2743 run_diff_cmd(pgm, name, NULL, attr_path,
2744 NULL, NULL, NULL, o, p);
2745 return;
2746 }
2747
2748 diff_fill_sha1_info(one);
2749 diff_fill_sha1_info(two);
2750
2751 if (!pgm &&
2752 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2753 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2754 /*
2755 * a filepair that changes between file and symlink
2756 * needs to be split into deletion and creation.
2757 */
2758 struct diff_filespec *null = alloc_filespec(two->path);
2759 run_diff_cmd(NULL, name, other, attr_path,
2760 one, null, &msg, o, p);
2761 free(null);
2762 strbuf_release(&msg);
2763
2764 null = alloc_filespec(one->path);
2765 run_diff_cmd(NULL, name, other, attr_path,
2766 null, two, &msg, o, p);
2767 free(null);
2768 }
2769 else
2770 run_diff_cmd(pgm, name, other, attr_path,
2771 one, two, &msg, o, p);
2772
2773 strbuf_release(&msg);
2774 }
2775
2776 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2777 struct diffstat_t *diffstat)
2778 {
2779 const char *name;
2780 const char *other;
2781 int complete_rewrite = 0;
2782
2783 if (DIFF_PAIR_UNMERGED(p)) {
2784 /* unmerged */
2785 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2786 return;
2787 }
2788
2789 name = p->one->path;
2790 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2791
2792 if (o->prefix_length)
2793 strip_prefix(o->prefix_length, &name, &other);
2794
2795 diff_fill_sha1_info(p->one);
2796 diff_fill_sha1_info(p->two);
2797
2798 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2799 complete_rewrite = 1;
2800 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2801 }
2802
2803 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2804 {
2805 const char *name;
2806 const char *other;
2807 const char *attr_path;
2808
2809 if (DIFF_PAIR_UNMERGED(p)) {
2810 /* unmerged */
2811 return;
2812 }
2813
2814 name = p->one->path;
2815 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2816 attr_path = other ? other : name;
2817
2818 if (o->prefix_length)
2819 strip_prefix(o->prefix_length, &name, &other);
2820
2821 diff_fill_sha1_info(p->one);
2822 diff_fill_sha1_info(p->two);
2823
2824 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2825 }
2826
2827 void diff_setup(struct diff_options *options)
2828 {
2829 memcpy(options, &default_diff_options, sizeof(*options));
2830
2831 options->file = stdout;
2832
2833 options->line_termination = '\n';
2834 options->break_opt = -1;
2835 options->rename_limit = -1;
2836 options->dirstat_percent = 3;
2837 options->context = 3;
2838
2839 options->change = diff_change;
2840 options->add_remove = diff_addremove;
2841 if (diff_use_color_default > 0)
2842 DIFF_OPT_SET(options, COLOR_DIFF);
2843 options->detect_rename = diff_detect_rename_default;
2844
2845 if (diff_no_prefix) {
2846 options->a_prefix = options->b_prefix = "";
2847 } else if (!diff_mnemonic_prefix) {
2848 options->a_prefix = "a/";
2849 options->b_prefix = "b/";
2850 }
2851 }
2852
2853 int diff_setup_done(struct diff_options *options)
2854 {
2855 int count = 0;
2856
2857 if (options->output_format & DIFF_FORMAT_NAME)
2858 count++;
2859 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2860 count++;
2861 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2862 count++;
2863 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2864 count++;
2865 if (count > 1)
2866 die("--name-only, --name-status, --check and -s are mutually exclusive");
2867
2868 /*
2869 * Most of the time we can say "there are changes"
2870 * only by checking if there are changed paths, but
2871 * --ignore-whitespace* options force us to look
2872 * inside contents.
2873 */
2874
2875 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2876 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2877 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2878 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2879 else
2880 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2881
2882 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2883 options->detect_rename = DIFF_DETECT_COPY;
2884
2885 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2886 options->prefix = NULL;
2887 if (options->prefix)
2888 options->prefix_length = strlen(options->prefix);
2889 else
2890 options->prefix_length = 0;
2891
2892 if (options->output_format & (DIFF_FORMAT_NAME |
2893 DIFF_FORMAT_NAME_STATUS |
2894 DIFF_FORMAT_CHECKDIFF |
2895 DIFF_FORMAT_NO_OUTPUT))
2896 options->output_format &= ~(DIFF_FORMAT_RAW |
2897 DIFF_FORMAT_NUMSTAT |
2898 DIFF_FORMAT_DIFFSTAT |
2899 DIFF_FORMAT_SHORTSTAT |
2900 DIFF_FORMAT_DIRSTAT |
2901 DIFF_FORMAT_SUMMARY |
2902 DIFF_FORMAT_PATCH);
2903
2904 /*
2905 * These cases always need recursive; we do not drop caller-supplied
2906 * recursive bits for other formats here.
2907 */
2908 if (options->output_format & (DIFF_FORMAT_PATCH |
2909 DIFF_FORMAT_NUMSTAT |
2910 DIFF_FORMAT_DIFFSTAT |
2911 DIFF_FORMAT_SHORTSTAT |
2912 DIFF_FORMAT_DIRSTAT |
2913 DIFF_FORMAT_SUMMARY |
2914 DIFF_FORMAT_CHECKDIFF))
2915 DIFF_OPT_SET(options, RECURSIVE);
2916 /*
2917 * Also pickaxe would not work very well if you do not say recursive
2918 */
2919 if (options->pickaxe)
2920 DIFF_OPT_SET(options, RECURSIVE);
2921 /*
2922 * When patches are generated, submodules diffed against the work tree
2923 * must be checked for dirtiness too so it can be shown in the output
2924 */
2925 if (options->output_format & DIFF_FORMAT_PATCH)
2926 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
2927
2928 if (options->detect_rename && options->rename_limit < 0)
2929 options->rename_limit = diff_rename_limit_default;
2930 if (options->setup & DIFF_SETUP_USE_CACHE) {
2931 if (!active_cache)
2932 /* read-cache does not die even when it fails
2933 * so it is safe for us to do this here. Also
2934 * it does not smudge active_cache or active_nr
2935 * when it fails, so we do not have to worry about
2936 * cleaning it up ourselves either.
2937 */
2938 read_cache();
2939 }
2940 if (options->abbrev <= 0 || 40 < options->abbrev)
2941 options->abbrev = 40; /* full */
2942
2943 /*
2944 * It does not make sense to show the first hit we happened
2945 * to have found. It does not make sense not to return with
2946 * exit code in such a case either.
2947 */
2948 if (DIFF_OPT_TST(options, QUICK)) {
2949 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2950 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2951 }
2952
2953 return 0;
2954 }
2955
2956 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2957 {
2958 char c, *eq;
2959 int len;
2960
2961 if (*arg != '-')
2962 return 0;
2963 c = *++arg;
2964 if (!c)
2965 return 0;
2966 if (c == arg_short) {
2967 c = *++arg;
2968 if (!c)
2969 return 1;
2970 if (val && isdigit(c)) {
2971 char *end;
2972 int n = strtoul(arg, &end, 10);
2973 if (*end)
2974 return 0;
2975 *val = n;
2976 return 1;
2977 }
2978 return 0;
2979 }
2980 if (c != '-')
2981 return 0;
2982 arg++;
2983 eq = strchr(arg, '=');
2984 if (eq)
2985 len = eq - arg;
2986 else
2987 len = strlen(arg);
2988 if (!len || strncmp(arg, arg_long, len))
2989 return 0;
2990 if (eq) {
2991 int n;
2992 char *end;
2993 if (!isdigit(*++eq))
2994 return 0;
2995 n = strtoul(eq, &end, 10);
2996 if (*end)
2997 return 0;
2998 *val = n;
2999 }
3000 return 1;
3001 }
3002
3003 static int diff_scoreopt_parse(const char *opt);
3004
3005 static inline int short_opt(char opt, const char **argv,
3006 const char **optarg)
3007 {
3008 const char *arg = argv[0];
3009 if (arg[0] != '-' || arg[1] != opt)
3010 return 0;
3011 if (arg[2] != '\0') {
3012 *optarg = arg + 2;
3013 return 1;
3014 }
3015 if (!argv[1])
3016 die("Option '%c' requires a value", opt);
3017 *optarg = argv[1];
3018 return 2;
3019 }
3020
3021 int parse_long_opt(const char *opt, const char **argv,
3022 const char **optarg)
3023 {
3024 const char *arg = argv[0];
3025 if (arg[0] != '-' || arg[1] != '-')
3026 return 0;
3027 arg += strlen("--");
3028 if (prefixcmp(arg, opt))
3029 return 0;
3030 arg += strlen(opt);
3031 if (*arg == '=') { /* sticked form: --option=value */
3032 *optarg = arg + 1;
3033 return 1;
3034 }
3035 if (*arg != '\0')
3036 return 0;
3037 /* separate form: --option value */
3038 if (!argv[1])
3039 die("Option '--%s' requires a value", opt);
3040 *optarg = argv[1];
3041 return 2;
3042 }
3043
3044 static int stat_opt(struct diff_options *options, const char **av)
3045 {
3046 const char *arg = av[0];
3047 char *end;
3048 int width = options->stat_width;
3049 int name_width = options->stat_name_width;
3050 int argcount = 1;
3051
3052 arg += strlen("--stat");
3053 end = (char *)arg;
3054
3055 switch (*arg) {
3056 case '-':
3057 if (!prefixcmp(arg, "-width")) {
3058 arg += strlen("-width");
3059 if (*arg == '=')
3060 width = strtoul(arg + 1, &end, 10);
3061 else if (!*arg && !av[1])
3062 die("Option '--stat-width' requires a value");
3063 else if (!*arg) {
3064 width = strtoul(av[1], &end, 10);
3065 argcount = 2;
3066 }
3067 } else if (!prefixcmp(arg, "-name-width")) {
3068 arg += strlen("-name-width");
3069 if (*arg == '=')
3070 name_width = strtoul(arg + 1, &end, 10);
3071 else if (!*arg && !av[1])
3072 die("Option '--stat-name-width' requires a value");
3073 else if (!*arg) {
3074 name_width = strtoul(av[1], &end, 10);
3075 argcount = 2;
3076 }
3077 }
3078 break;
3079 case '=':
3080 width = strtoul(arg+1, &end, 10);
3081 if (*end == ',')
3082 name_width = strtoul(end+1, &end, 10);
3083 }
3084
3085 /* Important! This checks all the error cases! */
3086 if (*end)
3087 return 0;
3088 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3089 options->stat_name_width = name_width;
3090 options->stat_width = width;
3091 return argcount;
3092 }
3093
3094 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3095 {
3096 const char *arg = av[0];
3097 const char *optarg;
3098 int argcount;
3099
3100 /* Output format options */
3101 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3102 options->output_format |= DIFF_FORMAT_PATCH;
3103 else if (opt_arg(arg, 'U', "unified", &options->context))
3104 options->output_format |= DIFF_FORMAT_PATCH;
3105 else if (!strcmp(arg, "--raw"))
3106 options->output_format |= DIFF_FORMAT_RAW;
3107 else if (!strcmp(arg, "--patch-with-raw"))
3108 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3109 else if (!strcmp(arg, "--numstat"))
3110 options->output_format |= DIFF_FORMAT_NUMSTAT;
3111 else if (!strcmp(arg, "--shortstat"))
3112 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3113 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
3114 options->output_format |= DIFF_FORMAT_DIRSTAT;
3115 else if (!strcmp(arg, "--cumulative")) {
3116 options->output_format |= DIFF_FORMAT_DIRSTAT;
3117 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
3118 } else if (opt_arg(arg, 0, "dirstat-by-file",
3119 &options->dirstat_percent)) {
3120 options->output_format |= DIFF_FORMAT_DIRSTAT;
3121 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
3122 }
3123 else if (!strcmp(arg, "--check"))
3124 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3125 else if (!strcmp(arg, "--summary"))
3126 options->output_format |= DIFF_FORMAT_SUMMARY;
3127 else if (!strcmp(arg, "--patch-with-stat"))
3128 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3129 else if (!strcmp(arg, "--name-only"))
3130 options->output_format |= DIFF_FORMAT_NAME;
3131 else if (!strcmp(arg, "--name-status"))
3132 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3133 else if (!strcmp(arg, "-s"))
3134 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3135 else if (!prefixcmp(arg, "--stat"))
3136 /* --stat, --stat-width, or --stat-name-width */
3137 return stat_opt(options, av);
3138
3139 /* renames options */
3140 else if (!prefixcmp(arg, "-B")) {
3141 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3142 return -1;
3143 }
3144 else if (!prefixcmp(arg, "-M")) {
3145 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3146 return -1;
3147 options->detect_rename = DIFF_DETECT_RENAME;
3148 }
3149 else if (!prefixcmp(arg, "-C")) {
3150 if (options->detect_rename == DIFF_DETECT_COPY)
3151 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3152 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3153 return -1;
3154 options->detect_rename = DIFF_DETECT_COPY;
3155 }
3156 else if (!strcmp(arg, "--no-renames"))
3157 options->detect_rename = 0;
3158 else if (!strcmp(arg, "--relative"))
3159 DIFF_OPT_SET(options, RELATIVE_NAME);
3160 else if (!prefixcmp(arg, "--relative=")) {
3161 DIFF_OPT_SET(options, RELATIVE_NAME);
3162 options->prefix = arg + 11;
3163 }
3164
3165 /* xdiff options */
3166 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3167 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3168 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3169 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3170 else if (!strcmp(arg, "--ignore-space-at-eol"))
3171 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3172 else if (!strcmp(arg, "--patience"))
3173 DIFF_XDL_SET(options, PATIENCE_DIFF);
3174
3175 /* flags options */
3176 else if (!strcmp(arg, "--binary")) {
3177 options->output_format |= DIFF_FORMAT_PATCH;
3178 DIFF_OPT_SET(options, BINARY);
3179 }
3180 else if (!strcmp(arg, "--full-index"))
3181 DIFF_OPT_SET(options, FULL_INDEX);
3182 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3183 DIFF_OPT_SET(options, TEXT);
3184 else if (!strcmp(arg, "-R"))
3185 DIFF_OPT_SET(options, REVERSE_DIFF);
3186 else if (!strcmp(arg, "--find-copies-harder"))
3187 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3188 else if (!strcmp(arg, "--follow"))
3189 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3190 else if (!strcmp(arg, "--color"))
3191 DIFF_OPT_SET(options, COLOR_DIFF);
3192 else if (!prefixcmp(arg, "--color=")) {
3193 int value = git_config_colorbool(NULL, arg+8, -1);
3194 if (value == 0)
3195 DIFF_OPT_CLR(options, COLOR_DIFF);
3196 else if (value > 0)
3197 DIFF_OPT_SET(options, COLOR_DIFF);
3198 else
3199 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3200 }
3201 else if (!strcmp(arg, "--no-color"))
3202 DIFF_OPT_CLR(options, COLOR_DIFF);
3203 else if (!strcmp(arg, "--color-words")) {
3204 DIFF_OPT_SET(options, COLOR_DIFF);
3205 options->word_diff = DIFF_WORDS_COLOR;
3206 }
3207 else if (!prefixcmp(arg, "--color-words=")) {
3208 DIFF_OPT_SET(options, COLOR_DIFF);
3209 options->word_diff = DIFF_WORDS_COLOR;
3210 options->word_regex = arg + 14;
3211 }
3212 else if (!strcmp(arg, "--word-diff")) {
3213 if (options->word_diff == DIFF_WORDS_NONE)
3214 options->word_diff = DIFF_WORDS_PLAIN;
3215 }
3216 else if (!prefixcmp(arg, "--word-diff=")) {
3217 const char *type = arg + 12;
3218 if (!strcmp(type, "plain"))
3219 options->word_diff = DIFF_WORDS_PLAIN;
3220 else if (!strcmp(type, "color")) {
3221 DIFF_OPT_SET(options, COLOR_DIFF);
3222 options->word_diff = DIFF_WORDS_COLOR;
3223 }
3224 else if (!strcmp(type, "porcelain"))
3225 options->word_diff = DIFF_WORDS_PORCELAIN;
3226 else if (!strcmp(type, "none"))
3227 options->word_diff = DIFF_WORDS_NONE;
3228 else
3229 die("bad --word-diff argument: %s", type);
3230 }
3231 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3232 if (options->word_diff == DIFF_WORDS_NONE)
3233 options->word_diff = DIFF_WORDS_PLAIN;
3234 options->word_regex = optarg;
3235 return argcount;
3236 }
3237 else if (!strcmp(arg, "--exit-code"))
3238 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3239 else if (!strcmp(arg, "--quiet"))
3240 DIFF_OPT_SET(options, QUICK);
3241 else if (!strcmp(arg, "--ext-diff"))
3242 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3243 else if (!strcmp(arg, "--no-ext-diff"))
3244 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3245 else if (!strcmp(arg, "--textconv"))
3246 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3247 else if (!strcmp(arg, "--no-textconv"))
3248 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3249 else if (!strcmp(arg, "--ignore-submodules")) {
3250 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3251 handle_ignore_submodules_arg(options, "all");
3252 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3253 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3254 handle_ignore_submodules_arg(options, arg + 20);
3255 } else if (!strcmp(arg, "--submodule"))
3256 DIFF_OPT_SET(options, SUBMODULE_LOG);
3257 else if (!prefixcmp(arg, "--submodule=")) {
3258 if (!strcmp(arg + 12, "log"))
3259 DIFF_OPT_SET(options, SUBMODULE_LOG);
3260 }
3261
3262 /* misc options */
3263 else if (!strcmp(arg, "-z"))
3264 options->line_termination = 0;
3265 else if ((argcount = short_opt('l', av, &optarg))) {
3266 options->rename_limit = strtoul(optarg, NULL, 10);
3267 return argcount;
3268 }
3269 else if ((argcount = short_opt('S', av, &optarg))) {
3270 options->pickaxe = optarg;
3271 return argcount;
3272 }
3273 else if (!strcmp(arg, "--pickaxe-all"))
3274 options->pickaxe_opts = DIFF_PICKAXE_ALL;
3275 else if (!strcmp(arg, "--pickaxe-regex"))
3276 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
3277 else if ((argcount = short_opt('O', av, &optarg))) {
3278 options->orderfile = optarg;
3279 return argcount;
3280 }
3281 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3282 options->filter = optarg;
3283 return argcount;
3284 }
3285 else if (!strcmp(arg, "--abbrev"))
3286 options->abbrev = DEFAULT_ABBREV;
3287 else if (!prefixcmp(arg, "--abbrev=")) {
3288 options->abbrev = strtoul(arg + 9, NULL, 10);
3289 if (options->abbrev < MINIMUM_ABBREV)
3290 options->abbrev = MINIMUM_ABBREV;
3291 else if (40 < options->abbrev)
3292 options->abbrev = 40;
3293 }
3294 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3295 options->a_prefix = optarg;
3296 return argcount;
3297 }
3298 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3299 options->b_prefix = optarg;
3300 return argcount;
3301 }
3302 else if (!strcmp(arg, "--no-prefix"))
3303 options->a_prefix = options->b_prefix = "";
3304 else if (opt_arg(arg, '\0', "inter-hunk-context",
3305 &options->interhunkcontext))
3306 ;
3307 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3308 options->file = fopen(optarg, "w");
3309 if (!options->file)
3310 die_errno("Could not open '%s'", arg + strlen("--output="));
3311 options->close_file = 1;
3312 return argcount;
3313 } else
3314 return 0;
3315 return 1;
3316 }
3317
3318 static int parse_num(const char **cp_p)
3319 {
3320 unsigned long num, scale;
3321 int ch, dot;
3322 const char *cp = *cp_p;
3323
3324 num = 0;
3325 scale = 1;
3326 dot = 0;
3327 for (;;) {
3328 ch = *cp;
3329 if ( !dot && ch == '.' ) {
3330 scale = 1;
3331 dot = 1;
3332 } else if ( ch == '%' ) {
3333 scale = dot ? scale*100 : 100;
3334 cp++; /* % is always at the end */
3335 break;
3336 } else if ( ch >= '0' && ch <= '9' ) {
3337 if ( scale < 100000 ) {
3338 scale *= 10;
3339 num = (num*10) + (ch-'0');
3340 }
3341 } else {
3342 break;
3343 }
3344 cp++;
3345 }
3346 *cp_p = cp;
3347
3348 /* user says num divided by scale and we say internally that
3349 * is MAX_SCORE * num / scale.
3350 */
3351 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3352 }
3353
3354 static int diff_scoreopt_parse(const char *opt)
3355 {
3356 int opt1, opt2, cmd;
3357
3358 if (*opt++ != '-')
3359 return -1;
3360 cmd = *opt++;
3361 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3362 return -1; /* that is not a -M, -C nor -B option */
3363
3364 opt1 = parse_num(&opt);
3365 if (cmd != 'B')
3366 opt2 = 0;
3367 else {
3368 if (*opt == 0)
3369 opt2 = 0;
3370 else if (*opt != '/')
3371 return -1; /* we expect -B80/99 or -B80 */
3372 else {
3373 opt++;
3374 opt2 = parse_num(&opt);
3375 }
3376 }
3377 if (*opt != 0)
3378 return -1;
3379 return opt1 | (opt2 << 16);
3380 }
3381
3382 struct diff_queue_struct diff_queued_diff;
3383
3384 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3385 {
3386 if (queue->alloc <= queue->nr) {
3387 queue->alloc = alloc_nr(queue->alloc);
3388 queue->queue = xrealloc(queue->queue,
3389 sizeof(dp) * queue->alloc);
3390 }
3391 queue->queue[queue->nr++] = dp;
3392 }
3393
3394 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3395 struct diff_filespec *one,
3396 struct diff_filespec *two)
3397 {
3398 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3399 dp->one = one;
3400 dp->two = two;
3401 if (queue)
3402 diff_q(queue, dp);
3403 return dp;
3404 }
3405
3406 void diff_free_filepair(struct diff_filepair *p)
3407 {
3408 free_filespec(p->one);
3409 free_filespec(p->two);
3410 free(p);
3411 }
3412
3413 /* This is different from find_unique_abbrev() in that
3414 * it stuffs the result with dots for alignment.
3415 */
3416 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3417 {
3418 int abblen;
3419 const char *abbrev;
3420 if (len == 40)
3421 return sha1_to_hex(sha1);
3422
3423 abbrev = find_unique_abbrev(sha1, len);
3424 abblen = strlen(abbrev);
3425 if (abblen < 37) {
3426 static char hex[41];
3427 if (len < abblen && abblen <= len + 2)
3428 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3429 else
3430 sprintf(hex, "%s...", abbrev);
3431 return hex;
3432 }
3433 return sha1_to_hex(sha1);
3434 }
3435
3436 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3437 {
3438 int line_termination = opt->line_termination;
3439 int inter_name_termination = line_termination ? '\t' : '\0';
3440 if (opt->output_prefix) {
3441 struct strbuf *msg = NULL;
3442 msg = opt->output_prefix(opt, opt->output_prefix_data);
3443 fprintf(opt->file, "%s", msg->buf);
3444 }
3445
3446 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3447 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3448 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3449 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3450 }
3451 if (p->score) {
3452 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3453 inter_name_termination);
3454 } else {
3455 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3456 }
3457
3458 if (p->status == DIFF_STATUS_COPIED ||
3459 p->status == DIFF_STATUS_RENAMED) {
3460 const char *name_a, *name_b;
3461 name_a = p->one->path;
3462 name_b = p->two->path;
3463 strip_prefix(opt->prefix_length, &name_a, &name_b);
3464 write_name_quoted(name_a, opt->file, inter_name_termination);
3465 write_name_quoted(name_b, opt->file, line_termination);
3466 } else {
3467 const char *name_a, *name_b;
3468 name_a = p->one->mode ? p->one->path : p->two->path;
3469 name_b = NULL;
3470 strip_prefix(opt->prefix_length, &name_a, &name_b);
3471 write_name_quoted(name_a, opt->file, line_termination);
3472 }
3473 }
3474
3475 int diff_unmodified_pair(struct diff_filepair *p)
3476 {
3477 /* This function is written stricter than necessary to support
3478 * the currently implemented transformers, but the idea is to
3479 * let transformers to produce diff_filepairs any way they want,
3480 * and filter and clean them up here before producing the output.
3481 */
3482 struct diff_filespec *one = p->one, *two = p->two;
3483
3484 if (DIFF_PAIR_UNMERGED(p))
3485 return 0; /* unmerged is interesting */
3486
3487 /* deletion, addition, mode or type change
3488 * and rename are all interesting.
3489 */
3490 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3491 DIFF_PAIR_MODE_CHANGED(p) ||
3492 strcmp(one->path, two->path))
3493 return 0;
3494
3495 /* both are valid and point at the same path. that is, we are
3496 * dealing with a change.
3497 */
3498 if (one->sha1_valid && two->sha1_valid &&
3499 !hashcmp(one->sha1, two->sha1) &&
3500 !one->dirty_submodule && !two->dirty_submodule)
3501 return 1; /* no change */
3502 if (!one->sha1_valid && !two->sha1_valid)
3503 return 1; /* both look at the same file on the filesystem. */
3504 return 0;
3505 }
3506
3507 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3508 {
3509 if (diff_unmodified_pair(p))
3510 return;
3511
3512 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3513 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3514 return; /* no tree diffs in patch format */
3515
3516 run_diff(p, o);
3517 }
3518
3519 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3520 struct diffstat_t *diffstat)
3521 {
3522 if (diff_unmodified_pair(p))
3523 return;
3524
3525 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3526 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3527 return; /* no tree diffs in patch format */
3528
3529 run_diffstat(p, o, diffstat);
3530 }
3531
3532 static void diff_flush_checkdiff(struct diff_filepair *p,
3533 struct diff_options *o)
3534 {
3535 if (diff_unmodified_pair(p))
3536 return;
3537
3538 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3539 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3540 return; /* no tree diffs in patch format */
3541
3542 run_checkdiff(p, o);
3543 }
3544
3545 int diff_queue_is_empty(void)
3546 {
3547 struct diff_queue_struct *q = &diff_queued_diff;
3548 int i;
3549 for (i = 0; i < q->nr; i++)
3550 if (!diff_unmodified_pair(q->queue[i]))
3551 return 0;
3552 return 1;
3553 }
3554
3555 #if DIFF_DEBUG
3556 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3557 {
3558 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3559 x, one ? one : "",
3560 s->path,
3561 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3562 s->mode,
3563 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3564 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3565 x, one ? one : "",
3566 s->size, s->xfrm_flags);
3567 }
3568
3569 void diff_debug_filepair(const struct diff_filepair *p, int i)
3570 {
3571 diff_debug_filespec(p->one, i, "one");
3572 diff_debug_filespec(p->two, i, "two");
3573 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3574 p->score, p->status ? p->status : '?',
3575 p->one->rename_used, p->broken_pair);
3576 }
3577
3578 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3579 {
3580 int i;
3581 if (msg)
3582 fprintf(stderr, "%s\n", msg);
3583 fprintf(stderr, "q->nr = %d\n", q->nr);
3584 for (i = 0; i < q->nr; i++) {
3585 struct diff_filepair *p = q->queue[i];
3586 diff_debug_filepair(p, i);
3587 }
3588 }
3589 #endif
3590
3591 static void diff_resolve_rename_copy(void)
3592 {
3593 int i;
3594 struct diff_filepair *p;
3595 struct diff_queue_struct *q = &diff_queued_diff;
3596
3597 diff_debug_queue("resolve-rename-copy", q);
3598
3599 for (i = 0; i < q->nr; i++) {
3600 p = q->queue[i];
3601 p->status = 0; /* undecided */
3602 if (DIFF_PAIR_UNMERGED(p))
3603 p->status = DIFF_STATUS_UNMERGED;
3604 else if (!DIFF_FILE_VALID(p->one))
3605 p->status = DIFF_STATUS_ADDED;
3606 else if (!DIFF_FILE_VALID(p->two))
3607 p->status = DIFF_STATUS_DELETED;
3608 else if (DIFF_PAIR_TYPE_CHANGED(p))
3609 p->status = DIFF_STATUS_TYPE_CHANGED;
3610
3611 /* from this point on, we are dealing with a pair
3612 * whose both sides are valid and of the same type, i.e.
3613 * either in-place edit or rename/copy edit.
3614 */
3615 else if (DIFF_PAIR_RENAME(p)) {
3616 /*
3617 * A rename might have re-connected a broken
3618 * pair up, causing the pathnames to be the
3619 * same again. If so, that's not a rename at
3620 * all, just a modification..
3621 *
3622 * Otherwise, see if this source was used for
3623 * multiple renames, in which case we decrement
3624 * the count, and call it a copy.
3625 */
3626 if (!strcmp(p->one->path, p->two->path))
3627 p->status = DIFF_STATUS_MODIFIED;
3628 else if (--p->one->rename_used > 0)
3629 p->status = DIFF_STATUS_COPIED;
3630 else
3631 p->status = DIFF_STATUS_RENAMED;
3632 }
3633 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3634 p->one->mode != p->two->mode ||
3635 p->one->dirty_submodule ||
3636 p->two->dirty_submodule ||
3637 is_null_sha1(p->one->sha1))
3638 p->status = DIFF_STATUS_MODIFIED;
3639 else {
3640 /* This is a "no-change" entry and should not
3641 * happen anymore, but prepare for broken callers.
3642 */
3643 error("feeding unmodified %s to diffcore",
3644 p->one->path);
3645 p->status = DIFF_STATUS_UNKNOWN;
3646 }
3647 }
3648 diff_debug_queue("resolve-rename-copy done", q);
3649 }
3650
3651 static int check_pair_status(struct diff_filepair *p)
3652 {
3653 switch (p->status) {
3654 case DIFF_STATUS_UNKNOWN:
3655 return 0;
3656 case 0:
3657 die("internal error in diff-resolve-rename-copy");
3658 default:
3659 return 1;
3660 }
3661 }
3662
3663 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3664 {
3665 int fmt = opt->output_format;
3666
3667 if (fmt & DIFF_FORMAT_CHECKDIFF)
3668 diff_flush_checkdiff(p, opt);
3669 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3670 diff_flush_raw(p, opt);
3671 else if (fmt & DIFF_FORMAT_NAME) {
3672 const char *name_a, *name_b;
3673 name_a = p->two->path;
3674 name_b = NULL;
3675 strip_prefix(opt->prefix_length, &name_a, &name_b);
3676 write_name_quoted(name_a, opt->file, opt->line_termination);
3677 }
3678 }
3679
3680 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3681 {
3682 if (fs->mode)
3683 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3684 else
3685 fprintf(file, " %s ", newdelete);
3686 write_name_quoted(fs->path, file, '\n');
3687 }
3688
3689
3690 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
3691 const char *line_prefix)
3692 {
3693 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3694 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
3695 p->two->mode, show_name ? ' ' : '\n');
3696 if (show_name) {
3697 write_name_quoted(p->two->path, file, '\n');
3698 }
3699 }
3700 }
3701
3702 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
3703 const char *line_prefix)
3704 {
3705 char *names = pprint_rename(p->one->path, p->two->path);
3706
3707 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3708 free(names);
3709 show_mode_change(file, p, 0, line_prefix);
3710 }
3711
3712 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
3713 {
3714 FILE *file = opt->file;
3715 char *line_prefix = "";
3716
3717 if (opt->output_prefix) {
3718 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
3719 line_prefix = buf->buf;
3720 }
3721
3722 switch(p->status) {
3723 case DIFF_STATUS_DELETED:
3724 fputs(line_prefix, file);
3725 show_file_mode_name(file, "delete", p->one);
3726 break;
3727 case DIFF_STATUS_ADDED:
3728 fputs(line_prefix, file);
3729 show_file_mode_name(file, "create", p->two);
3730 break;
3731 case DIFF_STATUS_COPIED:
3732 fputs(line_prefix, file);
3733 show_rename_copy(file, "copy", p, line_prefix);
3734 break;
3735 case DIFF_STATUS_RENAMED:
3736 fputs(line_prefix, file);
3737 show_rename_copy(file, "rename", p, line_prefix);
3738 break;
3739 default:
3740 if (p->score) {
3741 fprintf(file, "%s rewrite ", line_prefix);
3742 write_name_quoted(p->two->path, file, ' ');
3743 fprintf(file, "(%d%%)\n", similarity_index(p));
3744 }
3745 show_mode_change(file, p, !p->score, line_prefix);
3746 break;
3747 }
3748 }
3749
3750 struct patch_id_t {
3751 git_SHA_CTX *ctx;
3752 int patchlen;
3753 };
3754
3755 static int remove_space(char *line, int len)
3756 {
3757 int i;
3758 char *dst = line;
3759 unsigned char c;
3760
3761 for (i = 0; i < len; i++)
3762 if (!isspace((c = line[i])))
3763 *dst++ = c;
3764
3765 return dst - line;
3766 }
3767
3768 static void patch_id_consume(void *priv, char *line, unsigned long len)
3769 {
3770 struct patch_id_t *data = priv;
3771 int new_len;
3772
3773 /* Ignore line numbers when computing the SHA1 of the patch */
3774 if (!prefixcmp(line, "@@ -"))
3775 return;
3776
3777 new_len = remove_space(line, len);
3778
3779 git_SHA1_Update(data->ctx, line, new_len);
3780 data->patchlen += new_len;
3781 }
3782
3783 /* returns 0 upon success, and writes result into sha1 */
3784 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3785 {
3786 struct diff_queue_struct *q = &diff_queued_diff;
3787 int i;
3788 git_SHA_CTX ctx;
3789 struct patch_id_t data;
3790 char buffer[PATH_MAX * 4 + 20];
3791
3792 git_SHA1_Init(&ctx);
3793 memset(&data, 0, sizeof(struct patch_id_t));
3794 data.ctx = &ctx;
3795
3796 for (i = 0; i < q->nr; i++) {
3797 xpparam_t xpp;
3798 xdemitconf_t xecfg;
3799 mmfile_t mf1, mf2;
3800 struct diff_filepair *p = q->queue[i];
3801 int len1, len2;
3802
3803 memset(&xpp, 0, sizeof(xpp));
3804 memset(&xecfg, 0, sizeof(xecfg));
3805 if (p->status == 0)
3806 return error("internal diff status error");
3807 if (p->status == DIFF_STATUS_UNKNOWN)
3808 continue;
3809 if (diff_unmodified_pair(p))
3810 continue;
3811 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3812 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3813 continue;
3814 if (DIFF_PAIR_UNMERGED(p))
3815 continue;
3816
3817 diff_fill_sha1_info(p->one);
3818 diff_fill_sha1_info(p->two);
3819 if (fill_mmfile(&mf1, p->one) < 0 ||
3820 fill_mmfile(&mf2, p->two) < 0)
3821 return error("unable to read files to diff");
3822
3823 len1 = remove_space(p->one->path, strlen(p->one->path));
3824 len2 = remove_space(p->two->path, strlen(p->two->path));
3825 if (p->one->mode == 0)
3826 len1 = snprintf(buffer, sizeof(buffer),
3827 "diff--gita/%.*sb/%.*s"
3828 "newfilemode%06o"
3829 "---/dev/null"
3830 "+++b/%.*s",
3831 len1, p->one->path,
3832 len2, p->two->path,
3833 p->two->mode,
3834 len2, p->two->path);
3835 else if (p->two->mode == 0)
3836 len1 = snprintf(buffer, sizeof(buffer),
3837 "diff--gita/%.*sb/%.*s"
3838 "deletedfilemode%06o"
3839 "---a/%.*s"
3840 "+++/dev/null",
3841 len1, p->one->path,
3842 len2, p->two->path,
3843 p->one->mode,
3844 len1, p->one->path);
3845 else
3846 len1 = snprintf(buffer, sizeof(buffer),
3847 "diff--gita/%.*sb/%.*s"
3848 "---a/%.*s"
3849 "+++b/%.*s",
3850 len1, p->one->path,
3851 len2, p->two->path,
3852 len1, p->one->path,
3853 len2, p->two->path);
3854 git_SHA1_Update(&ctx, buffer, len1);
3855
3856 xpp.flags = 0;
3857 xecfg.ctxlen = 3;
3858 xecfg.flags = XDL_EMIT_FUNCNAMES;
3859 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3860 &xpp, &xecfg);
3861 }
3862
3863 git_SHA1_Final(sha1, &ctx);
3864 return 0;
3865 }
3866
3867 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3868 {
3869 struct diff_queue_struct *q = &diff_queued_diff;
3870 int i;
3871 int result = diff_get_patch_id(options, sha1);
3872
3873 for (i = 0; i < q->nr; i++)
3874 diff_free_filepair(q->queue[i]);
3875
3876 free(q->queue);
3877 DIFF_QUEUE_CLEAR(q);
3878
3879 return result;
3880 }
3881
3882 static int is_summary_empty(const struct diff_queue_struct *q)
3883 {
3884 int i;
3885
3886 for (i = 0; i < q->nr; i++) {
3887 const struct diff_filepair *p = q->queue[i];
3888
3889 switch (p->status) {
3890 case DIFF_STATUS_DELETED:
3891 case DIFF_STATUS_ADDED:
3892 case DIFF_STATUS_COPIED:
3893 case DIFF_STATUS_RENAMED:
3894 return 0;
3895 default:
3896 if (p->score)
3897 return 0;
3898 if (p->one->mode && p->two->mode &&
3899 p->one->mode != p->two->mode)
3900 return 0;
3901 break;
3902 }
3903 }
3904 return 1;
3905 }
3906
3907 void diff_flush(struct diff_options *options)
3908 {
3909 struct diff_queue_struct *q = &diff_queued_diff;
3910 int i, output_format = options->output_format;
3911 int separator = 0;
3912
3913 /*
3914 * Order: raw, stat, summary, patch
3915 * or: name/name-status/checkdiff (other bits clear)
3916 */
3917 if (!q->nr)
3918 goto free_queue;
3919
3920 if (output_format & (DIFF_FORMAT_RAW |
3921 DIFF_FORMAT_NAME |
3922 DIFF_FORMAT_NAME_STATUS |
3923 DIFF_FORMAT_CHECKDIFF)) {
3924 for (i = 0; i < q->nr; i++) {
3925 struct diff_filepair *p = q->queue[i];
3926 if (check_pair_status(p))
3927 flush_one_pair(p, options);
3928 }
3929 separator++;
3930 }
3931
3932 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3933 struct diffstat_t diffstat;
3934
3935 memset(&diffstat, 0, sizeof(struct diffstat_t));
3936 for (i = 0; i < q->nr; i++) {
3937 struct diff_filepair *p = q->queue[i];
3938 if (check_pair_status(p))
3939 diff_flush_stat(p, options, &diffstat);
3940 }
3941 if (output_format & DIFF_FORMAT_NUMSTAT)
3942 show_numstat(&diffstat, options);
3943 if (output_format & DIFF_FORMAT_DIFFSTAT)
3944 show_stats(&diffstat, options);
3945 if (output_format & DIFF_FORMAT_SHORTSTAT)
3946 show_shortstats(&diffstat, options);
3947 free_diffstat_info(&diffstat);
3948 separator++;
3949 }
3950 if (output_format & DIFF_FORMAT_DIRSTAT)
3951 show_dirstat(options);
3952
3953 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3954 for (i = 0; i < q->nr; i++) {
3955 diff_summary(options, q->queue[i]);
3956 }
3957 separator++;
3958 }
3959
3960 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
3961 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
3962 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
3963 /*
3964 * run diff_flush_patch for the exit status. setting
3965 * options->file to /dev/null should be safe, becaue we
3966 * aren't supposed to produce any output anyway.
3967 */
3968 if (options->close_file)
3969 fclose(options->file);
3970 options->file = fopen("/dev/null", "w");
3971 if (!options->file)
3972 die_errno("Could not open /dev/null");
3973 options->close_file = 1;
3974 for (i = 0; i < q->nr; i++) {
3975 struct diff_filepair *p = q->queue[i];
3976 if (check_pair_status(p))
3977 diff_flush_patch(p, options);
3978 if (options->found_changes)
3979 break;
3980 }
3981 }
3982
3983 if (output_format & DIFF_FORMAT_PATCH) {
3984 if (separator) {
3985 putc(options->line_termination, options->file);
3986 if (options->stat_sep) {
3987 /* attach patch instead of inline */
3988 fputs(options->stat_sep, options->file);
3989 }
3990 }
3991
3992 for (i = 0; i < q->nr; i++) {
3993 struct diff_filepair *p = q->queue[i];
3994 if (check_pair_status(p))
3995 diff_flush_patch(p, options);
3996 }
3997 }
3998
3999 if (output_format & DIFF_FORMAT_CALLBACK)
4000 options->format_callback(q, options, options->format_callback_data);
4001
4002 for (i = 0; i < q->nr; i++)
4003 diff_free_filepair(q->queue[i]);
4004 free_queue:
4005 free(q->queue);
4006 DIFF_QUEUE_CLEAR(q);
4007 if (options->close_file)
4008 fclose(options->file);
4009
4010 /*
4011 * Report the content-level differences with HAS_CHANGES;
4012 * diff_addremove/diff_change does not set the bit when
4013 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4014 */
4015 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4016 if (options->found_changes)
4017 DIFF_OPT_SET(options, HAS_CHANGES);
4018 else
4019 DIFF_OPT_CLR(options, HAS_CHANGES);
4020 }
4021 }
4022
4023 static void diffcore_apply_filter(const char *filter)
4024 {
4025 int i;
4026 struct diff_queue_struct *q = &diff_queued_diff;
4027 struct diff_queue_struct outq;
4028 DIFF_QUEUE_CLEAR(&outq);
4029
4030 if (!filter)
4031 return;
4032
4033 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4034 int found;
4035 for (i = found = 0; !found && i < q->nr; i++) {
4036 struct diff_filepair *p = q->queue[i];
4037 if (((p->status == DIFF_STATUS_MODIFIED) &&
4038 ((p->score &&
4039 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4040 (!p->score &&
4041 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4042 ((p->status != DIFF_STATUS_MODIFIED) &&
4043 strchr(filter, p->status)))
4044 found++;
4045 }
4046 if (found)
4047 return;
4048
4049 /* otherwise we will clear the whole queue
4050 * by copying the empty outq at the end of this
4051 * function, but first clear the current entries
4052 * in the queue.
4053 */
4054 for (i = 0; i < q->nr; i++)
4055 diff_free_filepair(q->queue[i]);
4056 }
4057 else {
4058 /* Only the matching ones */
4059 for (i = 0; i < q->nr; i++) {
4060 struct diff_filepair *p = q->queue[i];
4061
4062 if (((p->status == DIFF_STATUS_MODIFIED) &&
4063 ((p->score &&
4064 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4065 (!p->score &&
4066 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4067 ((p->status != DIFF_STATUS_MODIFIED) &&
4068 strchr(filter, p->status)))
4069 diff_q(&outq, p);
4070 else
4071 diff_free_filepair(p);
4072 }
4073 }
4074 free(q->queue);
4075 *q = outq;
4076 }
4077
4078 /* Check whether two filespecs with the same mode and size are identical */
4079 static int diff_filespec_is_identical(struct diff_filespec *one,
4080 struct diff_filespec *two)
4081 {
4082 if (S_ISGITLINK(one->mode))
4083 return 0;
4084 if (diff_populate_filespec(one, 0))
4085 return 0;
4086 if (diff_populate_filespec(two, 0))
4087 return 0;
4088 return !memcmp(one->data, two->data, one->size);
4089 }
4090
4091 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4092 {
4093 int i;
4094 struct diff_queue_struct *q = &diff_queued_diff;
4095 struct diff_queue_struct outq;
4096 DIFF_QUEUE_CLEAR(&outq);
4097
4098 for (i = 0; i < q->nr; i++) {
4099 struct diff_filepair *p = q->queue[i];
4100
4101 /*
4102 * 1. Entries that come from stat info dirtiness
4103 * always have both sides (iow, not create/delete),
4104 * one side of the object name is unknown, with
4105 * the same mode and size. Keep the ones that
4106 * do not match these criteria. They have real
4107 * differences.
4108 *
4109 * 2. At this point, the file is known to be modified,
4110 * with the same mode and size, and the object
4111 * name of one side is unknown. Need to inspect
4112 * the identical contents.
4113 */
4114 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4115 !DIFF_FILE_VALID(p->two) ||
4116 (p->one->sha1_valid && p->two->sha1_valid) ||
4117 (p->one->mode != p->two->mode) ||
4118 diff_populate_filespec(p->one, 1) ||
4119 diff_populate_filespec(p->two, 1) ||
4120 (p->one->size != p->two->size) ||
4121 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4122 diff_q(&outq, p);
4123 else {
4124 /*
4125 * The caller can subtract 1 from skip_stat_unmatch
4126 * to determine how many paths were dirty only
4127 * due to stat info mismatch.
4128 */
4129 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4130 diffopt->skip_stat_unmatch++;
4131 diff_free_filepair(p);
4132 }
4133 }
4134 free(q->queue);
4135 *q = outq;
4136 }
4137
4138 static int diffnamecmp(const void *a_, const void *b_)
4139 {
4140 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4141 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4142 const char *name_a, *name_b;
4143
4144 name_a = a->one ? a->one->path : a->two->path;
4145 name_b = b->one ? b->one->path : b->two->path;
4146 return strcmp(name_a, name_b);
4147 }
4148
4149 void diffcore_fix_diff_index(struct diff_options *options)
4150 {
4151 struct diff_queue_struct *q = &diff_queued_diff;
4152 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4153 }
4154
4155 void diffcore_std(struct diff_options *options)
4156 {
4157 if (options->skip_stat_unmatch)
4158 diffcore_skip_stat_unmatch(options);
4159 if (!options->found_follow) {
4160 /* See try_to_follow_renames() in tree-diff.c */
4161 if (options->break_opt != -1)
4162 diffcore_break(options->break_opt);
4163 if (options->detect_rename)
4164 diffcore_rename(options);
4165 if (options->break_opt != -1)
4166 diffcore_merge_broken();
4167 }
4168 if (options->pickaxe)
4169 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
4170 if (options->orderfile)
4171 diffcore_order(options->orderfile);
4172 if (!options->found_follow)
4173 /* See try_to_follow_renames() in tree-diff.c */
4174 diff_resolve_rename_copy();
4175 diffcore_apply_filter(options->filter);
4176
4177 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4178 DIFF_OPT_SET(options, HAS_CHANGES);
4179 else
4180 DIFF_OPT_CLR(options, HAS_CHANGES);
4181
4182 options->found_follow = 0;
4183 }
4184
4185 int diff_result_code(struct diff_options *opt, int status)
4186 {
4187 int result = 0;
4188 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4189 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4190 return status;
4191 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4192 DIFF_OPT_TST(opt, HAS_CHANGES))
4193 result |= 01;
4194 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4195 DIFF_OPT_TST(opt, CHECK_FAILED))
4196 result |= 02;
4197 return result;
4198 }
4199
4200 /*
4201 * Shall changes to this submodule be ignored?
4202 *
4203 * Submodule changes can be configured to be ignored separately for each path,
4204 * but that configuration can be overridden from the command line.
4205 */
4206 static int is_submodule_ignored(const char *path, struct diff_options *options)
4207 {
4208 int ignored = 0;
4209 unsigned orig_flags = options->flags;
4210 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4211 set_diffopt_flags_from_submodule_config(options, path);
4212 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4213 ignored = 1;
4214 options->flags = orig_flags;
4215 return ignored;
4216 }
4217
4218 void diff_addremove(struct diff_options *options,
4219 int addremove, unsigned mode,
4220 const unsigned char *sha1,
4221 const char *concatpath, unsigned dirty_submodule)
4222 {
4223 struct diff_filespec *one, *two;
4224
4225 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4226 return;
4227
4228 /* This may look odd, but it is a preparation for
4229 * feeding "there are unchanged files which should
4230 * not produce diffs, but when you are doing copy
4231 * detection you would need them, so here they are"
4232 * entries to the diff-core. They will be prefixed
4233 * with something like '=' or '*' (I haven't decided
4234 * which but should not make any difference).
4235 * Feeding the same new and old to diff_change()
4236 * also has the same effect.
4237 * Before the final output happens, they are pruned after
4238 * merged into rename/copy pairs as appropriate.
4239 */
4240 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4241 addremove = (addremove == '+' ? '-' :
4242 addremove == '-' ? '+' : addremove);
4243
4244 if (options->prefix &&
4245 strncmp(concatpath, options->prefix, options->prefix_length))
4246 return;
4247
4248 one = alloc_filespec(concatpath);
4249 two = alloc_filespec(concatpath);
4250
4251 if (addremove != '+')
4252 fill_filespec(one, sha1, mode);
4253 if (addremove != '-') {
4254 fill_filespec(two, sha1, mode);
4255 two->dirty_submodule = dirty_submodule;
4256 }
4257
4258 diff_queue(&diff_queued_diff, one, two);
4259 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4260 DIFF_OPT_SET(options, HAS_CHANGES);
4261 }
4262
4263 void diff_change(struct diff_options *options,
4264 unsigned old_mode, unsigned new_mode,
4265 const unsigned char *old_sha1,
4266 const unsigned char *new_sha1,
4267 const char *concatpath,
4268 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4269 {
4270 struct diff_filespec *one, *two;
4271
4272 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4273 is_submodule_ignored(concatpath, options))
4274 return;
4275
4276 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4277 unsigned tmp;
4278 const unsigned char *tmp_c;
4279 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4280 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4281 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4282 new_dirty_submodule = tmp;
4283 }
4284
4285 if (options->prefix &&
4286 strncmp(concatpath, options->prefix, options->prefix_length))
4287 return;
4288
4289 one = alloc_filespec(concatpath);
4290 two = alloc_filespec(concatpath);
4291 fill_filespec(one, old_sha1, old_mode);
4292 fill_filespec(two, new_sha1, new_mode);
4293 one->dirty_submodule = old_dirty_submodule;
4294 two->dirty_submodule = new_dirty_submodule;
4295
4296 diff_queue(&diff_queued_diff, one, two);
4297 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4298 DIFF_OPT_SET(options, HAS_CHANGES);
4299 }
4300
4301 void diff_unmerge(struct diff_options *options,
4302 const char *path,
4303 unsigned mode, const unsigned char *sha1)
4304 {
4305 struct diff_filespec *one, *two;
4306
4307 if (options->prefix &&
4308 strncmp(path, options->prefix, options->prefix_length))
4309 return;
4310
4311 one = alloc_filespec(path);
4312 two = alloc_filespec(path);
4313 fill_filespec(one, sha1, mode);
4314 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
4315 }
4316
4317 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4318 size_t *outsize)
4319 {
4320 struct diff_tempfile *temp;
4321 const char *argv[3];
4322 const char **arg = argv;
4323 struct child_process child;
4324 struct strbuf buf = STRBUF_INIT;
4325 int err = 0;
4326
4327 temp = prepare_temp_file(spec->path, spec);
4328 *arg++ = pgm;
4329 *arg++ = temp->name;
4330 *arg = NULL;
4331
4332 memset(&child, 0, sizeof(child));
4333 child.use_shell = 1;
4334 child.argv = argv;
4335 child.out = -1;
4336 if (start_command(&child)) {
4337 remove_tempfile();
4338 return NULL;
4339 }
4340
4341 if (strbuf_read(&buf, child.out, 0) < 0)
4342 err = error("error reading from textconv command '%s'", pgm);
4343 close(child.out);
4344
4345 if (finish_command(&child) || err) {
4346 strbuf_release(&buf);
4347 remove_tempfile();
4348 return NULL;
4349 }
4350 remove_tempfile();
4351
4352 return strbuf_detach(&buf, outsize);
4353 }
4354
4355 size_t fill_textconv(struct userdiff_driver *driver,
4356 struct diff_filespec *df,
4357 char **outbuf)
4358 {
4359 size_t size;
4360
4361 if (!driver || !driver->textconv) {
4362 if (!DIFF_FILE_VALID(df)) {
4363 *outbuf = "";
4364 return 0;
4365 }
4366 if (diff_populate_filespec(df, 0))
4367 die("unable to read files to diff");
4368 *outbuf = df->data;
4369 return df->size;
4370 }
4371
4372 if (driver->textconv_cache) {
4373 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4374 &size);
4375 if (*outbuf)
4376 return size;
4377 }
4378
4379 *outbuf = run_textconv(driver->textconv, df, &size);
4380 if (!*outbuf)
4381 die("unable to read files to diff");
4382
4383 if (driver->textconv_cache) {
4384 /* ignore errors, as we might be in a readonly repository */
4385 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4386 size);
4387 /*
4388 * we could save up changes and flush them all at the end,
4389 * but we would need an extra call after all diffing is done.
4390 * Since generating a cache entry is the slow path anyway,
4391 * this extra overhead probably isn't a big deal.
4392 */
4393 notes_cache_write(driver->textconv_cache);
4394 }
4395
4396 return size;
4397 }