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diff.c: convert word diffing to use emit_diff_symbol
[thirdparty/git.git] / diff.c
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1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4#include "cache.h"
5#include "config.h"
6#include "tempfile.h"
7#include "quote.h"
8#include "diff.h"
9#include "diffcore.h"
10#include "delta.h"
11#include "xdiff-interface.h"
12#include "color.h"
13#include "attr.h"
14#include "run-command.h"
15#include "utf8.h"
16#include "userdiff.h"
17#include "submodule-config.h"
18#include "submodule.h"
19#include "ll-merge.h"
20#include "string-list.h"
21#include "argv-array.h"
22#include "graph.h"
23
24#ifdef NO_FAST_WORKING_DIRECTORY
25#define FAST_WORKING_DIRECTORY 0
26#else
27#define FAST_WORKING_DIRECTORY 1
28#endif
29
30static int diff_detect_rename_default;
31static int diff_indent_heuristic = 1;
32static int diff_rename_limit_default = 400;
33static int diff_suppress_blank_empty;
34static int diff_use_color_default = -1;
35static int diff_context_default = 3;
36static int diff_interhunk_context_default;
37static const char *diff_word_regex_cfg;
38static const char *external_diff_cmd_cfg;
39static const char *diff_order_file_cfg;
40int diff_auto_refresh_index = 1;
41static int diff_mnemonic_prefix;
42static int diff_no_prefix;
43static int diff_stat_graph_width;
44static int diff_dirstat_permille_default = 30;
45static struct diff_options default_diff_options;
46static long diff_algorithm;
47static unsigned ws_error_highlight_default = WSEH_NEW;
48
49static char diff_colors[][COLOR_MAXLEN] = {
50 GIT_COLOR_RESET,
51 GIT_COLOR_NORMAL, /* CONTEXT */
52 GIT_COLOR_BOLD, /* METAINFO */
53 GIT_COLOR_CYAN, /* FRAGINFO */
54 GIT_COLOR_RED, /* OLD */
55 GIT_COLOR_GREEN, /* NEW */
56 GIT_COLOR_YELLOW, /* COMMIT */
57 GIT_COLOR_BG_RED, /* WHITESPACE */
58 GIT_COLOR_NORMAL, /* FUNCINFO */
59};
60
61static NORETURN void die_want_option(const char *option_name)
62{
63 die(_("option '%s' requires a value"), option_name);
64}
65
66static int parse_diff_color_slot(const char *var)
67{
68 if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
69 return DIFF_CONTEXT;
70 if (!strcasecmp(var, "meta"))
71 return DIFF_METAINFO;
72 if (!strcasecmp(var, "frag"))
73 return DIFF_FRAGINFO;
74 if (!strcasecmp(var, "old"))
75 return DIFF_FILE_OLD;
76 if (!strcasecmp(var, "new"))
77 return DIFF_FILE_NEW;
78 if (!strcasecmp(var, "commit"))
79 return DIFF_COMMIT;
80 if (!strcasecmp(var, "whitespace"))
81 return DIFF_WHITESPACE;
82 if (!strcasecmp(var, "func"))
83 return DIFF_FUNCINFO;
84 return -1;
85}
86
87static int parse_dirstat_params(struct diff_options *options, const char *params_string,
88 struct strbuf *errmsg)
89{
90 char *params_copy = xstrdup(params_string);
91 struct string_list params = STRING_LIST_INIT_NODUP;
92 int ret = 0;
93 int i;
94
95 if (*params_copy)
96 string_list_split_in_place(&params, params_copy, ',', -1);
97 for (i = 0; i < params.nr; i++) {
98 const char *p = params.items[i].string;
99 if (!strcmp(p, "changes")) {
100 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
101 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
102 } else if (!strcmp(p, "lines")) {
103 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
104 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
105 } else if (!strcmp(p, "files")) {
106 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
107 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
108 } else if (!strcmp(p, "noncumulative")) {
109 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
110 } else if (!strcmp(p, "cumulative")) {
111 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
112 } else if (isdigit(*p)) {
113 char *end;
114 int permille = strtoul(p, &end, 10) * 10;
115 if (*end == '.' && isdigit(*++end)) {
116 /* only use first digit */
117 permille += *end - '0';
118 /* .. and ignore any further digits */
119 while (isdigit(*++end))
120 ; /* nothing */
121 }
122 if (!*end)
123 options->dirstat_permille = permille;
124 else {
125 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
126 p);
127 ret++;
128 }
129 } else {
130 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
131 ret++;
132 }
133
134 }
135 string_list_clear(&params, 0);
136 free(params_copy);
137 return ret;
138}
139
140static int parse_submodule_params(struct diff_options *options, const char *value)
141{
142 if (!strcmp(value, "log"))
143 options->submodule_format = DIFF_SUBMODULE_LOG;
144 else if (!strcmp(value, "short"))
145 options->submodule_format = DIFF_SUBMODULE_SHORT;
146 else if (!strcmp(value, "diff"))
147 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
148 else
149 return -1;
150 return 0;
151}
152
153static int git_config_rename(const char *var, const char *value)
154{
155 if (!value)
156 return DIFF_DETECT_RENAME;
157 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
158 return DIFF_DETECT_COPY;
159 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
160}
161
162long parse_algorithm_value(const char *value)
163{
164 if (!value)
165 return -1;
166 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
167 return 0;
168 else if (!strcasecmp(value, "minimal"))
169 return XDF_NEED_MINIMAL;
170 else if (!strcasecmp(value, "patience"))
171 return XDF_PATIENCE_DIFF;
172 else if (!strcasecmp(value, "histogram"))
173 return XDF_HISTOGRAM_DIFF;
174 return -1;
175}
176
177static int parse_one_token(const char **arg, const char *token)
178{
179 const char *rest;
180 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
181 *arg = rest;
182 return 1;
183 }
184 return 0;
185}
186
187static int parse_ws_error_highlight(const char *arg)
188{
189 const char *orig_arg = arg;
190 unsigned val = 0;
191
192 while (*arg) {
193 if (parse_one_token(&arg, "none"))
194 val = 0;
195 else if (parse_one_token(&arg, "default"))
196 val = WSEH_NEW;
197 else if (parse_one_token(&arg, "all"))
198 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
199 else if (parse_one_token(&arg, "new"))
200 val |= WSEH_NEW;
201 else if (parse_one_token(&arg, "old"))
202 val |= WSEH_OLD;
203 else if (parse_one_token(&arg, "context"))
204 val |= WSEH_CONTEXT;
205 else {
206 return -1 - (int)(arg - orig_arg);
207 }
208 if (*arg)
209 arg++;
210 }
211 return val;
212}
213
214/*
215 * These are to give UI layer defaults.
216 * The core-level commands such as git-diff-files should
217 * never be affected by the setting of diff.renames
218 * the user happens to have in the configuration file.
219 */
220void init_diff_ui_defaults(void)
221{
222 diff_detect_rename_default = 1;
223}
224
225int git_diff_heuristic_config(const char *var, const char *value, void *cb)
226{
227 if (!strcmp(var, "diff.indentheuristic"))
228 diff_indent_heuristic = git_config_bool(var, value);
229 return 0;
230}
231
232int git_diff_ui_config(const char *var, const char *value, void *cb)
233{
234 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
235 diff_use_color_default = git_config_colorbool(var, value);
236 return 0;
237 }
238 if (!strcmp(var, "diff.context")) {
239 diff_context_default = git_config_int(var, value);
240 if (diff_context_default < 0)
241 return -1;
242 return 0;
243 }
244 if (!strcmp(var, "diff.interhunkcontext")) {
245 diff_interhunk_context_default = git_config_int(var, value);
246 if (diff_interhunk_context_default < 0)
247 return -1;
248 return 0;
249 }
250 if (!strcmp(var, "diff.renames")) {
251 diff_detect_rename_default = git_config_rename(var, value);
252 return 0;
253 }
254 if (!strcmp(var, "diff.autorefreshindex")) {
255 diff_auto_refresh_index = git_config_bool(var, value);
256 return 0;
257 }
258 if (!strcmp(var, "diff.mnemonicprefix")) {
259 diff_mnemonic_prefix = git_config_bool(var, value);
260 return 0;
261 }
262 if (!strcmp(var, "diff.noprefix")) {
263 diff_no_prefix = git_config_bool(var, value);
264 return 0;
265 }
266 if (!strcmp(var, "diff.statgraphwidth")) {
267 diff_stat_graph_width = git_config_int(var, value);
268 return 0;
269 }
270 if (!strcmp(var, "diff.external"))
271 return git_config_string(&external_diff_cmd_cfg, var, value);
272 if (!strcmp(var, "diff.wordregex"))
273 return git_config_string(&diff_word_regex_cfg, var, value);
274 if (!strcmp(var, "diff.orderfile"))
275 return git_config_pathname(&diff_order_file_cfg, var, value);
276
277 if (!strcmp(var, "diff.ignoresubmodules"))
278 handle_ignore_submodules_arg(&default_diff_options, value);
279
280 if (!strcmp(var, "diff.submodule")) {
281 if (parse_submodule_params(&default_diff_options, value))
282 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
283 value);
284 return 0;
285 }
286
287 if (!strcmp(var, "diff.algorithm")) {
288 diff_algorithm = parse_algorithm_value(value);
289 if (diff_algorithm < 0)
290 return -1;
291 return 0;
292 }
293
294 if (!strcmp(var, "diff.wserrorhighlight")) {
295 int val = parse_ws_error_highlight(value);
296 if (val < 0)
297 return -1;
298 ws_error_highlight_default = val;
299 return 0;
300 }
301
302 if (git_color_config(var, value, cb) < 0)
303 return -1;
304
305 return git_diff_basic_config(var, value, cb);
306}
307
308int git_diff_basic_config(const char *var, const char *value, void *cb)
309{
310 const char *name;
311
312 if (!strcmp(var, "diff.renamelimit")) {
313 diff_rename_limit_default = git_config_int(var, value);
314 return 0;
315 }
316
317 if (userdiff_config(var, value) < 0)
318 return -1;
319
320 if (skip_prefix(var, "diff.color.", &name) ||
321 skip_prefix(var, "color.diff.", &name)) {
322 int slot = parse_diff_color_slot(name);
323 if (slot < 0)
324 return 0;
325 if (!value)
326 return config_error_nonbool(var);
327 return color_parse(value, diff_colors[slot]);
328 }
329
330 /* like GNU diff's --suppress-blank-empty option */
331 if (!strcmp(var, "diff.suppressblankempty") ||
332 /* for backwards compatibility */
333 !strcmp(var, "diff.suppress-blank-empty")) {
334 diff_suppress_blank_empty = git_config_bool(var, value);
335 return 0;
336 }
337
338 if (!strcmp(var, "diff.dirstat")) {
339 struct strbuf errmsg = STRBUF_INIT;
340 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
341 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
342 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
343 errmsg.buf);
344 strbuf_release(&errmsg);
345 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
346 return 0;
347 }
348
349 if (starts_with(var, "submodule."))
350 return parse_submodule_config_option(var, value);
351
352 if (git_diff_heuristic_config(var, value, cb) < 0)
353 return -1;
354
355 return git_default_config(var, value, cb);
356}
357
358static char *quote_two(const char *one, const char *two)
359{
360 int need_one = quote_c_style(one, NULL, NULL, 1);
361 int need_two = quote_c_style(two, NULL, NULL, 1);
362 struct strbuf res = STRBUF_INIT;
363
364 if (need_one + need_two) {
365 strbuf_addch(&res, '"');
366 quote_c_style(one, &res, NULL, 1);
367 quote_c_style(two, &res, NULL, 1);
368 strbuf_addch(&res, '"');
369 } else {
370 strbuf_addstr(&res, one);
371 strbuf_addstr(&res, two);
372 }
373 return strbuf_detach(&res, NULL);
374}
375
376static const char *external_diff(void)
377{
378 static const char *external_diff_cmd = NULL;
379 static int done_preparing = 0;
380
381 if (done_preparing)
382 return external_diff_cmd;
383 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
384 if (!external_diff_cmd)
385 external_diff_cmd = external_diff_cmd_cfg;
386 done_preparing = 1;
387 return external_diff_cmd;
388}
389
390/*
391 * Keep track of files used for diffing. Sometimes such an entry
392 * refers to a temporary file, sometimes to an existing file, and
393 * sometimes to "/dev/null".
394 */
395static struct diff_tempfile {
396 /*
397 * filename external diff should read from, or NULL if this
398 * entry is currently not in use:
399 */
400 const char *name;
401
402 char hex[GIT_MAX_HEXSZ + 1];
403 char mode[10];
404
405 /*
406 * If this diff_tempfile instance refers to a temporary file,
407 * this tempfile object is used to manage its lifetime.
408 */
409 struct tempfile tempfile;
410} diff_temp[2];
411
412typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
413
414struct emit_callback {
415 int color_diff;
416 unsigned ws_rule;
417 int blank_at_eof_in_preimage;
418 int blank_at_eof_in_postimage;
419 int lno_in_preimage;
420 int lno_in_postimage;
421 sane_truncate_fn truncate;
422 const char **label_path;
423 struct diff_words_data *diff_words;
424 struct diff_options *opt;
425 struct strbuf *header;
426};
427
428static int count_lines(const char *data, int size)
429{
430 int count, ch, completely_empty = 1, nl_just_seen = 0;
431 count = 0;
432 while (0 < size--) {
433 ch = *data++;
434 if (ch == '\n') {
435 count++;
436 nl_just_seen = 1;
437 completely_empty = 0;
438 }
439 else {
440 nl_just_seen = 0;
441 completely_empty = 0;
442 }
443 }
444 if (completely_empty)
445 return 0;
446 if (!nl_just_seen)
447 count++; /* no trailing newline */
448 return count;
449}
450
451static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
452{
453 if (!DIFF_FILE_VALID(one)) {
454 mf->ptr = (char *)""; /* does not matter */
455 mf->size = 0;
456 return 0;
457 }
458 else if (diff_populate_filespec(one, 0))
459 return -1;
460
461 mf->ptr = one->data;
462 mf->size = one->size;
463 return 0;
464}
465
466/* like fill_mmfile, but only for size, so we can avoid retrieving blob */
467static unsigned long diff_filespec_size(struct diff_filespec *one)
468{
469 if (!DIFF_FILE_VALID(one))
470 return 0;
471 diff_populate_filespec(one, CHECK_SIZE_ONLY);
472 return one->size;
473}
474
475static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
476{
477 char *ptr = mf->ptr;
478 long size = mf->size;
479 int cnt = 0;
480
481 if (!size)
482 return cnt;
483 ptr += size - 1; /* pointing at the very end */
484 if (*ptr != '\n')
485 ; /* incomplete line */
486 else
487 ptr--; /* skip the last LF */
488 while (mf->ptr < ptr) {
489 char *prev_eol;
490 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
491 if (*prev_eol == '\n')
492 break;
493 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
494 break;
495 cnt++;
496 ptr = prev_eol - 1;
497 }
498 return cnt;
499}
500
501static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
502 struct emit_callback *ecbdata)
503{
504 int l1, l2, at;
505 unsigned ws_rule = ecbdata->ws_rule;
506 l1 = count_trailing_blank(mf1, ws_rule);
507 l2 = count_trailing_blank(mf2, ws_rule);
508 if (l2 <= l1) {
509 ecbdata->blank_at_eof_in_preimage = 0;
510 ecbdata->blank_at_eof_in_postimage = 0;
511 return;
512 }
513 at = count_lines(mf1->ptr, mf1->size);
514 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
515
516 at = count_lines(mf2->ptr, mf2->size);
517 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
518}
519
520static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
521 int first, const char *line, int len)
522{
523 int has_trailing_newline, has_trailing_carriage_return;
524 int nofirst;
525 FILE *file = o->file;
526
527 fputs(diff_line_prefix(o), file);
528
529 if (len == 0) {
530 has_trailing_newline = (first == '\n');
531 has_trailing_carriage_return = (!has_trailing_newline &&
532 (first == '\r'));
533 nofirst = has_trailing_newline || has_trailing_carriage_return;
534 } else {
535 has_trailing_newline = (len > 0 && line[len-1] == '\n');
536 if (has_trailing_newline)
537 len--;
538 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
539 if (has_trailing_carriage_return)
540 len--;
541 nofirst = 0;
542 }
543
544 if (len || !nofirst) {
545 fputs(set, file);
546 if (!nofirst)
547 fputc(first, file);
548 fwrite(line, len, 1, file);
549 fputs(reset, file);
550 }
551 if (has_trailing_carriage_return)
552 fputc('\r', file);
553 if (has_trailing_newline)
554 fputc('\n', file);
555}
556
557static void emit_line(struct diff_options *o, const char *set, const char *reset,
558 const char *line, int len)
559{
560 emit_line_0(o, set, reset, line[0], line+1, len-1);
561}
562
563enum diff_symbol {
564 DIFF_SYMBOL_BINARY_DIFF_HEADER,
565 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
566 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
567 DIFF_SYMBOL_BINARY_DIFF_BODY,
568 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
569 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
570 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
571 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
572 DIFF_SYMBOL_STATS_LINE,
573 DIFF_SYMBOL_WORD_DIFF,
574 DIFF_SYMBOL_SUBMODULE_ADD,
575 DIFF_SYMBOL_SUBMODULE_DEL,
576 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
577 DIFF_SYMBOL_SUBMODULE_MODIFIED,
578 DIFF_SYMBOL_SUBMODULE_HEADER,
579 DIFF_SYMBOL_SUBMODULE_ERROR,
580 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
581 DIFF_SYMBOL_REWRITE_DIFF,
582 DIFF_SYMBOL_BINARY_FILES,
583 DIFF_SYMBOL_HEADER,
584 DIFF_SYMBOL_FILEPAIR_PLUS,
585 DIFF_SYMBOL_FILEPAIR_MINUS,
586 DIFF_SYMBOL_WORDS_PORCELAIN,
587 DIFF_SYMBOL_WORDS,
588 DIFF_SYMBOL_CONTEXT,
589 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
590 DIFF_SYMBOL_PLUS,
591 DIFF_SYMBOL_MINUS,
592 DIFF_SYMBOL_NO_LF_EOF,
593 DIFF_SYMBOL_CONTEXT_FRAGINFO,
594 DIFF_SYMBOL_CONTEXT_MARKER,
595 DIFF_SYMBOL_SEPARATOR
596};
597/*
598 * Flags for content lines:
599 * 0..12 are whitespace rules
600 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
601 * 16 is marking if the line is blank at EOF
602 */
603#define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
604#define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
605
606static void emit_line_ws_markup(struct diff_options *o,
607 const char *set, const char *reset,
608 const char *line, int len, char sign,
609 unsigned ws_rule, int blank_at_eof)
610{
611 const char *ws = NULL;
612
613 if (o->ws_error_highlight & ws_rule) {
614 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
615 if (!*ws)
616 ws = NULL;
617 }
618
619 if (!ws)
620 emit_line_0(o, set, reset, sign, line, len);
621 else if (blank_at_eof)
622 /* Blank line at EOF - paint '+' as well */
623 emit_line_0(o, ws, reset, sign, line, len);
624 else {
625 /* Emit just the prefix, then the rest. */
626 emit_line_0(o, set, reset, sign, "", 0);
627 ws_check_emit(line, len, ws_rule,
628 o->file, set, reset, ws);
629 }
630}
631
632static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
633 const char *line, int len, unsigned flags)
634{
635 static const char *nneof = " No newline at end of file\n";
636 const char *context, *reset, *set, *meta, *fraginfo;
637 struct strbuf sb = STRBUF_INIT;
638 switch (s) {
639 case DIFF_SYMBOL_NO_LF_EOF:
640 context = diff_get_color_opt(o, DIFF_CONTEXT);
641 reset = diff_get_color_opt(o, DIFF_RESET);
642 putc('\n', o->file);
643 emit_line_0(o, context, reset, '\\',
644 nneof, strlen(nneof));
645 break;
646 case DIFF_SYMBOL_SUBMODULE_HEADER:
647 case DIFF_SYMBOL_SUBMODULE_ERROR:
648 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
649 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
650 case DIFF_SYMBOL_STATS_LINE:
651 case DIFF_SYMBOL_BINARY_DIFF_BODY:
652 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
653 emit_line(o, "", "", line, len);
654 break;
655 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
656 case DIFF_SYMBOL_CONTEXT_MARKER:
657 context = diff_get_color_opt(o, DIFF_CONTEXT);
658 reset = diff_get_color_opt(o, DIFF_RESET);
659 emit_line(o, context, reset, line, len);
660 break;
661 case DIFF_SYMBOL_SEPARATOR:
662 fprintf(o->file, "%s%c",
663 diff_line_prefix(o),
664 o->line_termination);
665 break;
666 case DIFF_SYMBOL_CONTEXT:
667 set = diff_get_color_opt(o, DIFF_CONTEXT);
668 reset = diff_get_color_opt(o, DIFF_RESET);
669 emit_line_ws_markup(o, set, reset, line, len, ' ',
670 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
671 break;
672 case DIFF_SYMBOL_PLUS:
673 set = diff_get_color_opt(o, DIFF_FILE_NEW);
674 reset = diff_get_color_opt(o, DIFF_RESET);
675 emit_line_ws_markup(o, set, reset, line, len, '+',
676 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
677 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
678 break;
679 case DIFF_SYMBOL_MINUS:
680 set = diff_get_color_opt(o, DIFF_FILE_OLD);
681 reset = diff_get_color_opt(o, DIFF_RESET);
682 emit_line_ws_markup(o, set, reset, line, len, '-',
683 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
684 break;
685 case DIFF_SYMBOL_WORDS_PORCELAIN:
686 context = diff_get_color_opt(o, DIFF_CONTEXT);
687 reset = diff_get_color_opt(o, DIFF_RESET);
688 emit_line(o, context, reset, line, len);
689 fputs("~\n", o->file);
690 break;
691 case DIFF_SYMBOL_WORDS:
692 context = diff_get_color_opt(o, DIFF_CONTEXT);
693 reset = diff_get_color_opt(o, DIFF_RESET);
694 /*
695 * Skip the prefix character, if any. With
696 * diff_suppress_blank_empty, there may be
697 * none.
698 */
699 if (line[0] != '\n') {
700 line++;
701 len--;
702 }
703 emit_line(o, context, reset, line, len);
704 break;
705 case DIFF_SYMBOL_FILEPAIR_PLUS:
706 meta = diff_get_color_opt(o, DIFF_METAINFO);
707 reset = diff_get_color_opt(o, DIFF_RESET);
708 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
709 line, reset,
710 strchr(line, ' ') ? "\t" : "");
711 break;
712 case DIFF_SYMBOL_FILEPAIR_MINUS:
713 meta = diff_get_color_opt(o, DIFF_METAINFO);
714 reset = diff_get_color_opt(o, DIFF_RESET);
715 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
716 line, reset,
717 strchr(line, ' ') ? "\t" : "");
718 break;
719 case DIFF_SYMBOL_BINARY_FILES:
720 case DIFF_SYMBOL_HEADER:
721 fprintf(o->file, "%s", line);
722 break;
723 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
724 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
725 break;
726 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
727 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
728 break;
729 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
730 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
731 break;
732 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
733 fputs(diff_line_prefix(o), o->file);
734 fputc('\n', o->file);
735 break;
736 case DIFF_SYMBOL_REWRITE_DIFF:
737 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
738 reset = diff_get_color_opt(o, DIFF_RESET);
739 emit_line(o, fraginfo, reset, line, len);
740 break;
741 case DIFF_SYMBOL_SUBMODULE_ADD:
742 set = diff_get_color_opt(o, DIFF_FILE_NEW);
743 reset = diff_get_color_opt(o, DIFF_RESET);
744 emit_line(o, set, reset, line, len);
745 break;
746 case DIFF_SYMBOL_SUBMODULE_DEL:
747 set = diff_get_color_opt(o, DIFF_FILE_OLD);
748 reset = diff_get_color_opt(o, DIFF_RESET);
749 emit_line(o, set, reset, line, len);
750 break;
751 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
752 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
753 diff_line_prefix(o), line);
754 break;
755 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
756 fprintf(o->file, "%sSubmodule %s contains modified content\n",
757 diff_line_prefix(o), line);
758 break;
759 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
760 emit_line(o, "", "", " 0 files changed\n",
761 strlen(" 0 files changed\n"));
762 break;
763 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
764 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
765 break;
766 case DIFF_SYMBOL_WORD_DIFF:
767 fprintf(o->file, "%.*s", len, line);
768 break;
769 default:
770 die("BUG: unknown diff symbol");
771 }
772 strbuf_release(&sb);
773}
774
775void diff_emit_submodule_del(struct diff_options *o, const char *line)
776{
777 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
778}
779
780void diff_emit_submodule_add(struct diff_options *o, const char *line)
781{
782 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
783}
784
785void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
786{
787 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
788 path, strlen(path), 0);
789}
790
791void diff_emit_submodule_modified(struct diff_options *o, const char *path)
792{
793 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
794 path, strlen(path), 0);
795}
796
797void diff_emit_submodule_header(struct diff_options *o, const char *header)
798{
799 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
800 header, strlen(header), 0);
801}
802
803void diff_emit_submodule_error(struct diff_options *o, const char *err)
804{
805 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
806}
807
808void diff_emit_submodule_pipethrough(struct diff_options *o,
809 const char *line, int len)
810{
811 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
812}
813
814static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
815{
816 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
817 ecbdata->blank_at_eof_in_preimage &&
818 ecbdata->blank_at_eof_in_postimage &&
819 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
820 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
821 return 0;
822 return ws_blank_line(line, len, ecbdata->ws_rule);
823}
824
825static void emit_add_line(const char *reset,
826 struct emit_callback *ecbdata,
827 const char *line, int len)
828{
829 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
830 if (new_blank_line_at_eof(ecbdata, line, len))
831 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
832
833 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
834}
835
836static void emit_del_line(const char *reset,
837 struct emit_callback *ecbdata,
838 const char *line, int len)
839{
840 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
841 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
842}
843
844static void emit_context_line(const char *reset,
845 struct emit_callback *ecbdata,
846 const char *line, int len)
847{
848 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
849 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
850}
851
852static void emit_hunk_header(struct emit_callback *ecbdata,
853 const char *line, int len)
854{
855 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
856 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
857 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
858 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
859 static const char atat[2] = { '@', '@' };
860 const char *cp, *ep;
861 struct strbuf msgbuf = STRBUF_INIT;
862 int org_len = len;
863 int i = 1;
864
865 /*
866 * As a hunk header must begin with "@@ -<old>, +<new> @@",
867 * it always is at least 10 bytes long.
868 */
869 if (len < 10 ||
870 memcmp(line, atat, 2) ||
871 !(ep = memmem(line + 2, len - 2, atat, 2))) {
872 emit_diff_symbol(ecbdata->opt,
873 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
874 return;
875 }
876 ep += 2; /* skip over @@ */
877
878 /* The hunk header in fraginfo color */
879 strbuf_addstr(&msgbuf, frag);
880 strbuf_add(&msgbuf, line, ep - line);
881 strbuf_addstr(&msgbuf, reset);
882
883 /*
884 * trailing "\r\n"
885 */
886 for ( ; i < 3; i++)
887 if (line[len - i] == '\r' || line[len - i] == '\n')
888 len--;
889
890 /* blank before the func header */
891 for (cp = ep; ep - line < len; ep++)
892 if (*ep != ' ' && *ep != '\t')
893 break;
894 if (ep != cp) {
895 strbuf_addstr(&msgbuf, context);
896 strbuf_add(&msgbuf, cp, ep - cp);
897 strbuf_addstr(&msgbuf, reset);
898 }
899
900 if (ep < line + len) {
901 strbuf_addstr(&msgbuf, func);
902 strbuf_add(&msgbuf, ep, line + len - ep);
903 strbuf_addstr(&msgbuf, reset);
904 }
905
906 strbuf_add(&msgbuf, line + len, org_len - len);
907 strbuf_complete_line(&msgbuf);
908 emit_diff_symbol(ecbdata->opt,
909 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
910 strbuf_release(&msgbuf);
911}
912
913static struct diff_tempfile *claim_diff_tempfile(void) {
914 int i;
915 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
916 if (!diff_temp[i].name)
917 return diff_temp + i;
918 die("BUG: diff is failing to clean up its tempfiles");
919}
920
921static void remove_tempfile(void)
922{
923 int i;
924 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
925 if (is_tempfile_active(&diff_temp[i].tempfile))
926 delete_tempfile(&diff_temp[i].tempfile);
927 diff_temp[i].name = NULL;
928 }
929}
930
931static void add_line_count(struct strbuf *out, int count)
932{
933 switch (count) {
934 case 0:
935 strbuf_addstr(out, "0,0");
936 break;
937 case 1:
938 strbuf_addstr(out, "1");
939 break;
940 default:
941 strbuf_addf(out, "1,%d", count);
942 break;
943 }
944}
945
946static void emit_rewrite_lines(struct emit_callback *ecb,
947 int prefix, const char *data, int size)
948{
949 const char *endp = NULL;
950 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
951
952 while (0 < size) {
953 int len;
954
955 endp = memchr(data, '\n', size);
956 len = endp ? (endp - data + 1) : size;
957 if (prefix != '+') {
958 ecb->lno_in_preimage++;
959 emit_del_line(reset, ecb, data, len);
960 } else {
961 ecb->lno_in_postimage++;
962 emit_add_line(reset, ecb, data, len);
963 }
964 size -= len;
965 data += len;
966 }
967 if (!endp)
968 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
969}
970
971static void emit_rewrite_diff(const char *name_a,
972 const char *name_b,
973 struct diff_filespec *one,
974 struct diff_filespec *two,
975 struct userdiff_driver *textconv_one,
976 struct userdiff_driver *textconv_two,
977 struct diff_options *o)
978{
979 int lc_a, lc_b;
980 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
981 const char *a_prefix, *b_prefix;
982 char *data_one, *data_two;
983 size_t size_one, size_two;
984 struct emit_callback ecbdata;
985 struct strbuf out = STRBUF_INIT;
986
987 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
988 a_prefix = o->b_prefix;
989 b_prefix = o->a_prefix;
990 } else {
991 a_prefix = o->a_prefix;
992 b_prefix = o->b_prefix;
993 }
994
995 name_a += (*name_a == '/');
996 name_b += (*name_b == '/');
997
998 strbuf_reset(&a_name);
999 strbuf_reset(&b_name);
1000 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1001 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1002
1003 size_one = fill_textconv(textconv_one, one, &data_one);
1004 size_two = fill_textconv(textconv_two, two, &data_two);
1005
1006 memset(&ecbdata, 0, sizeof(ecbdata));
1007 ecbdata.color_diff = want_color(o->use_color);
1008 ecbdata.ws_rule = whitespace_rule(name_b);
1009 ecbdata.opt = o;
1010 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1011 mmfile_t mf1, mf2;
1012 mf1.ptr = (char *)data_one;
1013 mf2.ptr = (char *)data_two;
1014 mf1.size = size_one;
1015 mf2.size = size_two;
1016 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1017 }
1018 ecbdata.lno_in_preimage = 1;
1019 ecbdata.lno_in_postimage = 1;
1020
1021 lc_a = count_lines(data_one, size_one);
1022 lc_b = count_lines(data_two, size_two);
1023
1024 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1025 a_name.buf, a_name.len, 0);
1026 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1027 b_name.buf, b_name.len, 0);
1028
1029 strbuf_addstr(&out, "@@ -");
1030 if (!o->irreversible_delete)
1031 add_line_count(&out, lc_a);
1032 else
1033 strbuf_addstr(&out, "?,?");
1034 strbuf_addstr(&out, " +");
1035 add_line_count(&out, lc_b);
1036 strbuf_addstr(&out, " @@\n");
1037 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1038 strbuf_release(&out);
1039
1040 if (lc_a && !o->irreversible_delete)
1041 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1042 if (lc_b)
1043 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1044 if (textconv_one)
1045 free((char *)data_one);
1046 if (textconv_two)
1047 free((char *)data_two);
1048}
1049
1050struct diff_words_buffer {
1051 mmfile_t text;
1052 long alloc;
1053 struct diff_words_orig {
1054 const char *begin, *end;
1055 } *orig;
1056 int orig_nr, orig_alloc;
1057};
1058
1059static void diff_words_append(char *line, unsigned long len,
1060 struct diff_words_buffer *buffer)
1061{
1062 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1063 line++;
1064 len--;
1065 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1066 buffer->text.size += len;
1067 buffer->text.ptr[buffer->text.size] = '\0';
1068}
1069
1070struct diff_words_style_elem {
1071 const char *prefix;
1072 const char *suffix;
1073 const char *color; /* NULL; filled in by the setup code if
1074 * color is enabled */
1075};
1076
1077struct diff_words_style {
1078 enum diff_words_type type;
1079 struct diff_words_style_elem new, old, ctx;
1080 const char *newline;
1081};
1082
1083static struct diff_words_style diff_words_styles[] = {
1084 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1085 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1086 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1087};
1088
1089struct diff_words_data {
1090 struct diff_words_buffer minus, plus;
1091 const char *current_plus;
1092 int last_minus;
1093 struct diff_options *opt;
1094 regex_t *word_regex;
1095 enum diff_words_type type;
1096 struct diff_words_style *style;
1097};
1098
1099static int fn_out_diff_words_write_helper(struct diff_options *o,
1100 struct diff_words_style_elem *st_el,
1101 const char *newline,
1102 size_t count, const char *buf)
1103{
1104 int print = 0;
1105 struct strbuf sb = STRBUF_INIT;
1106
1107 while (count) {
1108 char *p = memchr(buf, '\n', count);
1109 if (print)
1110 strbuf_addstr(&sb, diff_line_prefix(o));
1111
1112 if (p != buf) {
1113 const char *reset = st_el->color && *st_el->color ?
1114 GIT_COLOR_RESET : NULL;
1115 if (st_el->color && *st_el->color)
1116 strbuf_addstr(&sb, st_el->color);
1117 strbuf_addstr(&sb, st_el->prefix);
1118 strbuf_add(&sb, buf, p ? p - buf : count);
1119 strbuf_addstr(&sb, st_el->suffix);
1120 if (reset)
1121 strbuf_addstr(&sb, reset);
1122 }
1123 if (!p)
1124 goto out;
1125
1126 strbuf_addstr(&sb, newline);
1127 count -= p + 1 - buf;
1128 buf = p + 1;
1129 print = 1;
1130 if (count) {
1131 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1132 sb.buf, sb.len, 0);
1133 strbuf_reset(&sb);
1134 }
1135 }
1136
1137out:
1138 if (sb.len)
1139 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1140 sb.buf, sb.len, 0);
1141 strbuf_release(&sb);
1142 return 0;
1143}
1144
1145/*
1146 * '--color-words' algorithm can be described as:
1147 *
1148 * 1. collect the minus/plus lines of a diff hunk, divided into
1149 * minus-lines and plus-lines;
1150 *
1151 * 2. break both minus-lines and plus-lines into words and
1152 * place them into two mmfile_t with one word for each line;
1153 *
1154 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1155 *
1156 * And for the common parts of the both file, we output the plus side text.
1157 * diff_words->current_plus is used to trace the current position of the plus file
1158 * which printed. diff_words->last_minus is used to trace the last minus word
1159 * printed.
1160 *
1161 * For '--graph' to work with '--color-words', we need to output the graph prefix
1162 * on each line of color words output. Generally, there are two conditions on
1163 * which we should output the prefix.
1164 *
1165 * 1. diff_words->last_minus == 0 &&
1166 * diff_words->current_plus == diff_words->plus.text.ptr
1167 *
1168 * that is: the plus text must start as a new line, and if there is no minus
1169 * word printed, a graph prefix must be printed.
1170 *
1171 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1172 * *(diff_words->current_plus - 1) == '\n'
1173 *
1174 * that is: a graph prefix must be printed following a '\n'
1175 */
1176static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1177{
1178 if ((diff_words->last_minus == 0 &&
1179 diff_words->current_plus == diff_words->plus.text.ptr) ||
1180 (diff_words->current_plus > diff_words->plus.text.ptr &&
1181 *(diff_words->current_plus - 1) == '\n')) {
1182 return 1;
1183 } else {
1184 return 0;
1185 }
1186}
1187
1188static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
1189{
1190 struct diff_words_data *diff_words = priv;
1191 struct diff_words_style *style = diff_words->style;
1192 int minus_first, minus_len, plus_first, plus_len;
1193 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1194 struct diff_options *opt = diff_words->opt;
1195 const char *line_prefix;
1196
1197 if (line[0] != '@' || parse_hunk_header(line, len,
1198 &minus_first, &minus_len, &plus_first, &plus_len))
1199 return;
1200
1201 assert(opt);
1202 line_prefix = diff_line_prefix(opt);
1203
1204 /* POSIX requires that first be decremented by one if len == 0... */
1205 if (minus_len) {
1206 minus_begin = diff_words->minus.orig[minus_first].begin;
1207 minus_end =
1208 diff_words->minus.orig[minus_first + minus_len - 1].end;
1209 } else
1210 minus_begin = minus_end =
1211 diff_words->minus.orig[minus_first].end;
1212
1213 if (plus_len) {
1214 plus_begin = diff_words->plus.orig[plus_first].begin;
1215 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1216 } else
1217 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1218
1219 if (color_words_output_graph_prefix(diff_words)) {
1220 fputs(line_prefix, diff_words->opt->file);
1221 }
1222 if (diff_words->current_plus != plus_begin) {
1223 fn_out_diff_words_write_helper(diff_words->opt,
1224 &style->ctx, style->newline,
1225 plus_begin - diff_words->current_plus,
1226 diff_words->current_plus);
1227 }
1228 if (minus_begin != minus_end) {
1229 fn_out_diff_words_write_helper(diff_words->opt,
1230 &style->old, style->newline,
1231 minus_end - minus_begin, minus_begin);
1232 }
1233 if (plus_begin != plus_end) {
1234 fn_out_diff_words_write_helper(diff_words->opt,
1235 &style->new, style->newline,
1236 plus_end - plus_begin, plus_begin);
1237 }
1238
1239 diff_words->current_plus = plus_end;
1240 diff_words->last_minus = minus_first;
1241}
1242
1243/* This function starts looking at *begin, and returns 0 iff a word was found. */
1244static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1245 int *begin, int *end)
1246{
1247 if (word_regex && *begin < buffer->size) {
1248 regmatch_t match[1];
1249 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1250 buffer->size - *begin, 1, match, 0)) {
1251 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1252 '\n', match[0].rm_eo - match[0].rm_so);
1253 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1254 *begin += match[0].rm_so;
1255 return *begin >= *end;
1256 }
1257 return -1;
1258 }
1259
1260 /* find the next word */
1261 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
1262 (*begin)++;
1263 if (*begin >= buffer->size)
1264 return -1;
1265
1266 /* find the end of the word */
1267 *end = *begin + 1;
1268 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
1269 (*end)++;
1270
1271 return 0;
1272}
1273
1274/*
1275 * This function splits the words in buffer->text, stores the list with
1276 * newline separator into out, and saves the offsets of the original words
1277 * in buffer->orig.
1278 */
1279static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
1280 regex_t *word_regex)
1281{
1282 int i, j;
1283 long alloc = 0;
1284
1285 out->size = 0;
1286 out->ptr = NULL;
1287
1288 /* fake an empty "0th" word */
1289 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
1290 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
1291 buffer->orig_nr = 1;
1292
1293 for (i = 0; i < buffer->text.size; i++) {
1294 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
1295 return;
1296
1297 /* store original boundaries */
1298 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
1299 buffer->orig_alloc);
1300 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
1301 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
1302 buffer->orig_nr++;
1303
1304 /* store one word */
1305 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
1306 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
1307 out->ptr[out->size + j - i] = '\n';
1308 out->size += j - i + 1;
1309
1310 i = j - 1;
1311 }
1312}
1313
1314/* this executes the word diff on the accumulated buffers */
1315static void diff_words_show(struct diff_words_data *diff_words)
1316{
1317 xpparam_t xpp;
1318 xdemitconf_t xecfg;
1319 mmfile_t minus, plus;
1320 struct diff_words_style *style = diff_words->style;
1321
1322 struct diff_options *opt = diff_words->opt;
1323 const char *line_prefix;
1324
1325 assert(opt);
1326 line_prefix = diff_line_prefix(opt);
1327
1328 /* special case: only removal */
1329 if (!diff_words->plus.text.size) {
1330 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
1331 line_prefix, strlen(line_prefix), 0);
1332 fn_out_diff_words_write_helper(diff_words->opt,
1333 &style->old, style->newline,
1334 diff_words->minus.text.size,
1335 diff_words->minus.text.ptr);
1336 diff_words->minus.text.size = 0;
1337 return;
1338 }
1339
1340 diff_words->current_plus = diff_words->plus.text.ptr;
1341 diff_words->last_minus = 0;
1342
1343 memset(&xpp, 0, sizeof(xpp));
1344 memset(&xecfg, 0, sizeof(xecfg));
1345 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1346 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1347 xpp.flags = 0;
1348 /* as only the hunk header will be parsed, we need a 0-context */
1349 xecfg.ctxlen = 0;
1350 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1351 &xpp, &xecfg))
1352 die("unable to generate word diff");
1353 free(minus.ptr);
1354 free(plus.ptr);
1355 if (diff_words->current_plus != diff_words->plus.text.ptr +
1356 diff_words->plus.text.size) {
1357 if (color_words_output_graph_prefix(diff_words))
1358 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
1359 line_prefix, strlen(line_prefix), 0);
1360 fn_out_diff_words_write_helper(diff_words->opt,
1361 &style->ctx, style->newline,
1362 diff_words->plus.text.ptr + diff_words->plus.text.size
1363 - diff_words->current_plus, diff_words->current_plus);
1364 }
1365 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1366}
1367
1368/* In "color-words" mode, show word-diff of words accumulated in the buffer */
1369static void diff_words_flush(struct emit_callback *ecbdata)
1370{
1371 if (ecbdata->diff_words->minus.text.size ||
1372 ecbdata->diff_words->plus.text.size)
1373 diff_words_show(ecbdata->diff_words);
1374}
1375
1376static void diff_filespec_load_driver(struct diff_filespec *one)
1377{
1378 /* Use already-loaded driver */
1379 if (one->driver)
1380 return;
1381
1382 if (S_ISREG(one->mode))
1383 one->driver = userdiff_find_by_path(one->path);
1384
1385 /* Fallback to default settings */
1386 if (!one->driver)
1387 one->driver = userdiff_find_by_name("default");
1388}
1389
1390static const char *userdiff_word_regex(struct diff_filespec *one)
1391{
1392 diff_filespec_load_driver(one);
1393 return one->driver->word_regex;
1394}
1395
1396static void init_diff_words_data(struct emit_callback *ecbdata,
1397 struct diff_options *orig_opts,
1398 struct diff_filespec *one,
1399 struct diff_filespec *two)
1400{
1401 int i;
1402 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1403 memcpy(o, orig_opts, sizeof(struct diff_options));
1404
1405 ecbdata->diff_words =
1406 xcalloc(1, sizeof(struct diff_words_data));
1407 ecbdata->diff_words->type = o->word_diff;
1408 ecbdata->diff_words->opt = o;
1409 if (!o->word_regex)
1410 o->word_regex = userdiff_word_regex(one);
1411 if (!o->word_regex)
1412 o->word_regex = userdiff_word_regex(two);
1413 if (!o->word_regex)
1414 o->word_regex = diff_word_regex_cfg;
1415 if (o->word_regex) {
1416 ecbdata->diff_words->word_regex = (regex_t *)
1417 xmalloc(sizeof(regex_t));
1418 if (regcomp(ecbdata->diff_words->word_regex,
1419 o->word_regex,
1420 REG_EXTENDED | REG_NEWLINE))
1421 die ("Invalid regular expression: %s",
1422 o->word_regex);
1423 }
1424 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1425 if (o->word_diff == diff_words_styles[i].type) {
1426 ecbdata->diff_words->style =
1427 &diff_words_styles[i];
1428 break;
1429 }
1430 }
1431 if (want_color(o->use_color)) {
1432 struct diff_words_style *st = ecbdata->diff_words->style;
1433 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1434 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1435 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1436 }
1437}
1438
1439static void free_diff_words_data(struct emit_callback *ecbdata)
1440{
1441 if (ecbdata->diff_words) {
1442 diff_words_flush(ecbdata);
1443 free (ecbdata->diff_words->opt);
1444 free (ecbdata->diff_words->minus.text.ptr);
1445 free (ecbdata->diff_words->minus.orig);
1446 free (ecbdata->diff_words->plus.text.ptr);
1447 free (ecbdata->diff_words->plus.orig);
1448 if (ecbdata->diff_words->word_regex) {
1449 regfree(ecbdata->diff_words->word_regex);
1450 free(ecbdata->diff_words->word_regex);
1451 }
1452 FREE_AND_NULL(ecbdata->diff_words);
1453 }
1454}
1455
1456const char *diff_get_color(int diff_use_color, enum color_diff ix)
1457{
1458 if (want_color(diff_use_color))
1459 return diff_colors[ix];
1460 return "";
1461}
1462
1463const char *diff_line_prefix(struct diff_options *opt)
1464{
1465 struct strbuf *msgbuf;
1466 if (!opt->output_prefix)
1467 return "";
1468
1469 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1470 return msgbuf->buf;
1471}
1472
1473static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1474{
1475 const char *cp;
1476 unsigned long allot;
1477 size_t l = len;
1478
1479 if (ecb->truncate)
1480 return ecb->truncate(line, len);
1481 cp = line;
1482 allot = l;
1483 while (0 < l) {
1484 (void) utf8_width(&cp, &l);
1485 if (!cp)
1486 break; /* truncated in the middle? */
1487 }
1488 return allot - l;
1489}
1490
1491static void find_lno(const char *line, struct emit_callback *ecbdata)
1492{
1493 const char *p;
1494 ecbdata->lno_in_preimage = 0;
1495 ecbdata->lno_in_postimage = 0;
1496 p = strchr(line, '-');
1497 if (!p)
1498 return; /* cannot happen */
1499 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1500 p = strchr(p, '+');
1501 if (!p)
1502 return; /* cannot happen */
1503 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1504}
1505
1506static void fn_out_consume(void *priv, char *line, unsigned long len)
1507{
1508 struct emit_callback *ecbdata = priv;
1509 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1510 struct diff_options *o = ecbdata->opt;
1511
1512 o->found_changes = 1;
1513
1514 if (ecbdata->header) {
1515 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
1516 ecbdata->header->buf, ecbdata->header->len, 0);
1517 strbuf_reset(ecbdata->header);
1518 ecbdata->header = NULL;
1519 }
1520
1521 if (ecbdata->label_path[0]) {
1522 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1523 ecbdata->label_path[0],
1524 strlen(ecbdata->label_path[0]), 0);
1525 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1526 ecbdata->label_path[1],
1527 strlen(ecbdata->label_path[1]), 0);
1528 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1529 }
1530
1531 if (diff_suppress_blank_empty
1532 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1533 line[0] = '\n';
1534 len = 1;
1535 }
1536
1537 if (line[0] == '@') {
1538 if (ecbdata->diff_words)
1539 diff_words_flush(ecbdata);
1540 len = sane_truncate_line(ecbdata, line, len);
1541 find_lno(line, ecbdata);
1542 emit_hunk_header(ecbdata, line, len);
1543 return;
1544 }
1545
1546 if (ecbdata->diff_words) {
1547 enum diff_symbol s =
1548 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
1549 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
1550 if (line[0] == '-') {
1551 diff_words_append(line, len,
1552 &ecbdata->diff_words->minus);
1553 return;
1554 } else if (line[0] == '+') {
1555 diff_words_append(line, len,
1556 &ecbdata->diff_words->plus);
1557 return;
1558 } else if (starts_with(line, "\\ ")) {
1559 /*
1560 * Eat the "no newline at eof" marker as if we
1561 * saw a "+" or "-" line with nothing on it,
1562 * and return without diff_words_flush() to
1563 * defer processing. If this is the end of
1564 * preimage, more "+" lines may come after it.
1565 */
1566 return;
1567 }
1568 diff_words_flush(ecbdata);
1569 emit_diff_symbol(o, s, line, len, 0);
1570 return;
1571 }
1572
1573 switch (line[0]) {
1574 case '+':
1575 ecbdata->lno_in_postimage++;
1576 emit_add_line(reset, ecbdata, line + 1, len - 1);
1577 break;
1578 case '-':
1579 ecbdata->lno_in_preimage++;
1580 emit_del_line(reset, ecbdata, line + 1, len - 1);
1581 break;
1582 case ' ':
1583 ecbdata->lno_in_postimage++;
1584 ecbdata->lno_in_preimage++;
1585 emit_context_line(reset, ecbdata, line + 1, len - 1);
1586 break;
1587 default:
1588 /* incomplete line at the end */
1589 ecbdata->lno_in_preimage++;
1590 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
1591 line, len, 0);
1592 break;
1593 }
1594}
1595
1596static char *pprint_rename(const char *a, const char *b)
1597{
1598 const char *old = a;
1599 const char *new = b;
1600 struct strbuf name = STRBUF_INIT;
1601 int pfx_length, sfx_length;
1602 int pfx_adjust_for_slash;
1603 int len_a = strlen(a);
1604 int len_b = strlen(b);
1605 int a_midlen, b_midlen;
1606 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1607 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1608
1609 if (qlen_a || qlen_b) {
1610 quote_c_style(a, &name, NULL, 0);
1611 strbuf_addstr(&name, " => ");
1612 quote_c_style(b, &name, NULL, 0);
1613 return strbuf_detach(&name, NULL);
1614 }
1615
1616 /* Find common prefix */
1617 pfx_length = 0;
1618 while (*old && *new && *old == *new) {
1619 if (*old == '/')
1620 pfx_length = old - a + 1;
1621 old++;
1622 new++;
1623 }
1624
1625 /* Find common suffix */
1626 old = a + len_a;
1627 new = b + len_b;
1628 sfx_length = 0;
1629 /*
1630 * If there is a common prefix, it must end in a slash. In
1631 * that case we let this loop run 1 into the prefix to see the
1632 * same slash.
1633 *
1634 * If there is no common prefix, we cannot do this as it would
1635 * underrun the input strings.
1636 */
1637 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1638 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1639 b + pfx_length - pfx_adjust_for_slash <= new &&
1640 *old == *new) {
1641 if (*old == '/')
1642 sfx_length = len_a - (old - a);
1643 old--;
1644 new--;
1645 }
1646
1647 /*
1648 * pfx{mid-a => mid-b}sfx
1649 * {pfx-a => pfx-b}sfx
1650 * pfx{sfx-a => sfx-b}
1651 * name-a => name-b
1652 */
1653 a_midlen = len_a - pfx_length - sfx_length;
1654 b_midlen = len_b - pfx_length - sfx_length;
1655 if (a_midlen < 0)
1656 a_midlen = 0;
1657 if (b_midlen < 0)
1658 b_midlen = 0;
1659
1660 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1661 if (pfx_length + sfx_length) {
1662 strbuf_add(&name, a, pfx_length);
1663 strbuf_addch(&name, '{');
1664 }
1665 strbuf_add(&name, a + pfx_length, a_midlen);
1666 strbuf_addstr(&name, " => ");
1667 strbuf_add(&name, b + pfx_length, b_midlen);
1668 if (pfx_length + sfx_length) {
1669 strbuf_addch(&name, '}');
1670 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1671 }
1672 return strbuf_detach(&name, NULL);
1673}
1674
1675struct diffstat_t {
1676 int nr;
1677 int alloc;
1678 struct diffstat_file {
1679 char *from_name;
1680 char *name;
1681 char *print_name;
1682 unsigned is_unmerged:1;
1683 unsigned is_binary:1;
1684 unsigned is_renamed:1;
1685 unsigned is_interesting:1;
1686 uintmax_t added, deleted;
1687 } **files;
1688};
1689
1690static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1691 const char *name_a,
1692 const char *name_b)
1693{
1694 struct diffstat_file *x;
1695 x = xcalloc(1, sizeof(*x));
1696 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1697 diffstat->files[diffstat->nr++] = x;
1698 if (name_b) {
1699 x->from_name = xstrdup(name_a);
1700 x->name = xstrdup(name_b);
1701 x->is_renamed = 1;
1702 }
1703 else {
1704 x->from_name = NULL;
1705 x->name = xstrdup(name_a);
1706 }
1707 return x;
1708}
1709
1710static void diffstat_consume(void *priv, char *line, unsigned long len)
1711{
1712 struct diffstat_t *diffstat = priv;
1713 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1714
1715 if (line[0] == '+')
1716 x->added++;
1717 else if (line[0] == '-')
1718 x->deleted++;
1719}
1720
1721const char mime_boundary_leader[] = "------------";
1722
1723static int scale_linear(int it, int width, int max_change)
1724{
1725 if (!it)
1726 return 0;
1727 /*
1728 * make sure that at least one '-' or '+' is printed if
1729 * there is any change to this path. The easiest way is to
1730 * scale linearly as if the alloted width is one column shorter
1731 * than it is, and then add 1 to the result.
1732 */
1733 return 1 + (it * (width - 1) / max_change);
1734}
1735
1736static void show_graph(struct strbuf *out, char ch, int cnt,
1737 const char *set, const char *reset)
1738{
1739 if (cnt <= 0)
1740 return;
1741 strbuf_addstr(out, set);
1742 strbuf_addchars(out, ch, cnt);
1743 strbuf_addstr(out, reset);
1744}
1745
1746static void fill_print_name(struct diffstat_file *file)
1747{
1748 char *pname;
1749
1750 if (file->print_name)
1751 return;
1752
1753 if (!file->is_renamed) {
1754 struct strbuf buf = STRBUF_INIT;
1755 if (quote_c_style(file->name, &buf, NULL, 0)) {
1756 pname = strbuf_detach(&buf, NULL);
1757 } else {
1758 pname = file->name;
1759 strbuf_release(&buf);
1760 }
1761 } else {
1762 pname = pprint_rename(file->from_name, file->name);
1763 }
1764 file->print_name = pname;
1765}
1766
1767static void print_stat_summary_inserts_deletes(struct diff_options *options,
1768 int files, int insertions, int deletions)
1769{
1770 struct strbuf sb = STRBUF_INIT;
1771
1772 if (!files) {
1773 assert(insertions == 0 && deletions == 0);
1774 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
1775 NULL, 0, 0);
1776 return;
1777 }
1778
1779 strbuf_addf(&sb,
1780 (files == 1) ? " %d file changed" : " %d files changed",
1781 files);
1782
1783 /*
1784 * For binary diff, the caller may want to print "x files
1785 * changed" with insertions == 0 && deletions == 0.
1786 *
1787 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1788 * is probably less confusing (i.e skip over "2 files changed
1789 * but nothing about added/removed lines? Is this a bug in Git?").
1790 */
1791 if (insertions || deletions == 0) {
1792 strbuf_addf(&sb,
1793 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1794 insertions);
1795 }
1796
1797 if (deletions || insertions == 0) {
1798 strbuf_addf(&sb,
1799 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1800 deletions);
1801 }
1802 strbuf_addch(&sb, '\n');
1803 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
1804 sb.buf, sb.len, 0);
1805 strbuf_release(&sb);
1806}
1807
1808void print_stat_summary(FILE *fp, int files,
1809 int insertions, int deletions)
1810{
1811 struct diff_options o;
1812 memset(&o, 0, sizeof(o));
1813 o.file = fp;
1814
1815 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
1816}
1817
1818static void show_stats(struct diffstat_t *data, struct diff_options *options)
1819{
1820 int i, len, add, del, adds = 0, dels = 0;
1821 uintmax_t max_change = 0, max_len = 0;
1822 int total_files = data->nr, count;
1823 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1824 const char *reset, *add_c, *del_c;
1825 int extra_shown = 0;
1826 const char *line_prefix = diff_line_prefix(options);
1827 struct strbuf out = STRBUF_INIT;
1828
1829 if (data->nr == 0)
1830 return;
1831
1832 count = options->stat_count ? options->stat_count : data->nr;
1833
1834 reset = diff_get_color_opt(options, DIFF_RESET);
1835 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1836 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1837
1838 /*
1839 * Find the longest filename and max number of changes
1840 */
1841 for (i = 0; (i < count) && (i < data->nr); i++) {
1842 struct diffstat_file *file = data->files[i];
1843 uintmax_t change = file->added + file->deleted;
1844
1845 if (!file->is_interesting && (change == 0)) {
1846 count++; /* not shown == room for one more */
1847 continue;
1848 }
1849 fill_print_name(file);
1850 len = strlen(file->print_name);
1851 if (max_len < len)
1852 max_len = len;
1853
1854 if (file->is_unmerged) {
1855 /* "Unmerged" is 8 characters */
1856 bin_width = bin_width < 8 ? 8 : bin_width;
1857 continue;
1858 }
1859 if (file->is_binary) {
1860 /* "Bin XXX -> YYY bytes" */
1861 int w = 14 + decimal_width(file->added)
1862 + decimal_width(file->deleted);
1863 bin_width = bin_width < w ? w : bin_width;
1864 /* Display change counts aligned with "Bin" */
1865 number_width = 3;
1866 continue;
1867 }
1868
1869 if (max_change < change)
1870 max_change = change;
1871 }
1872 count = i; /* where we can stop scanning in data->files[] */
1873
1874 /*
1875 * We have width = stat_width or term_columns() columns total.
1876 * We want a maximum of min(max_len, stat_name_width) for the name part.
1877 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1878 * We also need 1 for " " and 4 + decimal_width(max_change)
1879 * for " | NNNN " and one the empty column at the end, altogether
1880 * 6 + decimal_width(max_change).
1881 *
1882 * If there's not enough space, we will use the smaller of
1883 * stat_name_width (if set) and 5/8*width for the filename,
1884 * and the rest for constant elements + graph part, but no more
1885 * than stat_graph_width for the graph part.
1886 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1887 * for the standard terminal size).
1888 *
1889 * In other words: stat_width limits the maximum width, and
1890 * stat_name_width fixes the maximum width of the filename,
1891 * and is also used to divide available columns if there
1892 * aren't enough.
1893 *
1894 * Binary files are displayed with "Bin XXX -> YYY bytes"
1895 * instead of the change count and graph. This part is treated
1896 * similarly to the graph part, except that it is not
1897 * "scaled". If total width is too small to accommodate the
1898 * guaranteed minimum width of the filename part and the
1899 * separators and this message, this message will "overflow"
1900 * making the line longer than the maximum width.
1901 */
1902
1903 if (options->stat_width == -1)
1904 width = term_columns() - strlen(line_prefix);
1905 else
1906 width = options->stat_width ? options->stat_width : 80;
1907 number_width = decimal_width(max_change) > number_width ?
1908 decimal_width(max_change) : number_width;
1909
1910 if (options->stat_graph_width == -1)
1911 options->stat_graph_width = diff_stat_graph_width;
1912
1913 /*
1914 * Guarantee 3/8*16==6 for the graph part
1915 * and 5/8*16==10 for the filename part
1916 */
1917 if (width < 16 + 6 + number_width)
1918 width = 16 + 6 + number_width;
1919
1920 /*
1921 * First assign sizes that are wanted, ignoring available width.
1922 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1923 * starting from "XXX" should fit in graph_width.
1924 */
1925 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1926 if (options->stat_graph_width &&
1927 options->stat_graph_width < graph_width)
1928 graph_width = options->stat_graph_width;
1929
1930 name_width = (options->stat_name_width > 0 &&
1931 options->stat_name_width < max_len) ?
1932 options->stat_name_width : max_len;
1933
1934 /*
1935 * Adjust adjustable widths not to exceed maximum width
1936 */
1937 if (name_width + number_width + 6 + graph_width > width) {
1938 if (graph_width > width * 3/8 - number_width - 6) {
1939 graph_width = width * 3/8 - number_width - 6;
1940 if (graph_width < 6)
1941 graph_width = 6;
1942 }
1943
1944 if (options->stat_graph_width &&
1945 graph_width > options->stat_graph_width)
1946 graph_width = options->stat_graph_width;
1947 if (name_width > width - number_width - 6 - graph_width)
1948 name_width = width - number_width - 6 - graph_width;
1949 else
1950 graph_width = width - number_width - 6 - name_width;
1951 }
1952
1953 /*
1954 * From here name_width is the width of the name area,
1955 * and graph_width is the width of the graph area.
1956 * max_change is used to scale graph properly.
1957 */
1958 for (i = 0; i < count; i++) {
1959 const char *prefix = "";
1960 struct diffstat_file *file = data->files[i];
1961 char *name = file->print_name;
1962 uintmax_t added = file->added;
1963 uintmax_t deleted = file->deleted;
1964 int name_len;
1965
1966 if (!file->is_interesting && (added + deleted == 0))
1967 continue;
1968
1969 /*
1970 * "scale" the filename
1971 */
1972 len = name_width;
1973 name_len = strlen(name);
1974 if (name_width < name_len) {
1975 char *slash;
1976 prefix = "...";
1977 len -= 3;
1978 name += name_len - len;
1979 slash = strchr(name, '/');
1980 if (slash)
1981 name = slash;
1982 }
1983
1984 if (file->is_binary) {
1985 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
1986 strbuf_addf(&out, " %*s", number_width, "Bin");
1987 if (!added && !deleted) {
1988 strbuf_addch(&out, '\n');
1989 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
1990 out.buf, out.len, 0);
1991 strbuf_reset(&out);
1992 continue;
1993 }
1994 strbuf_addf(&out, " %s%"PRIuMAX"%s",
1995 del_c, deleted, reset);
1996 strbuf_addstr(&out, " -> ");
1997 strbuf_addf(&out, "%s%"PRIuMAX"%s",
1998 add_c, added, reset);
1999 strbuf_addstr(&out, " bytes\n");
2000 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2001 out.buf, out.len, 0);
2002 strbuf_reset(&out);
2003 continue;
2004 }
2005 else if (file->is_unmerged) {
2006 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2007 strbuf_addstr(&out, " Unmerged\n");
2008 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2009 out.buf, out.len, 0);
2010 strbuf_reset(&out);
2011 continue;
2012 }
2013
2014 /*
2015 * scale the add/delete
2016 */
2017 add = added;
2018 del = deleted;
2019
2020 if (graph_width <= max_change) {
2021 int total = scale_linear(add + del, graph_width, max_change);
2022 if (total < 2 && add && del)
2023 /* width >= 2 due to the sanity check */
2024 total = 2;
2025 if (add < del) {
2026 add = scale_linear(add, graph_width, max_change);
2027 del = total - add;
2028 } else {
2029 del = scale_linear(del, graph_width, max_change);
2030 add = total - del;
2031 }
2032 }
2033 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2034 strbuf_addf(&out, " %*"PRIuMAX"%s",
2035 number_width, added + deleted,
2036 added + deleted ? " " : "");
2037 show_graph(&out, '+', add, add_c, reset);
2038 show_graph(&out, '-', del, del_c, reset);
2039 strbuf_addch(&out, '\n');
2040 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2041 out.buf, out.len, 0);
2042 strbuf_reset(&out);
2043 }
2044
2045 for (i = 0; i < data->nr; i++) {
2046 struct diffstat_file *file = data->files[i];
2047 uintmax_t added = file->added;
2048 uintmax_t deleted = file->deleted;
2049
2050 if (file->is_unmerged ||
2051 (!file->is_interesting && (added + deleted == 0))) {
2052 total_files--;
2053 continue;
2054 }
2055
2056 if (!file->is_binary) {
2057 adds += added;
2058 dels += deleted;
2059 }
2060 if (i < count)
2061 continue;
2062 if (!extra_shown)
2063 emit_diff_symbol(options,
2064 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2065 NULL, 0, 0);
2066 extra_shown = 1;
2067 }
2068
2069 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2070}
2071
2072static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2073{
2074 int i, adds = 0, dels = 0, total_files = data->nr;
2075
2076 if (data->nr == 0)
2077 return;
2078
2079 for (i = 0; i < data->nr; i++) {
2080 int added = data->files[i]->added;
2081 int deleted = data->files[i]->deleted;
2082
2083 if (data->files[i]->is_unmerged ||
2084 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2085 total_files--;
2086 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2087 adds += added;
2088 dels += deleted;
2089 }
2090 }
2091 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2092}
2093
2094static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2095{
2096 int i;
2097
2098 if (data->nr == 0)
2099 return;
2100
2101 for (i = 0; i < data->nr; i++) {
2102 struct diffstat_file *file = data->files[i];
2103
2104 fprintf(options->file, "%s", diff_line_prefix(options));
2105
2106 if (file->is_binary)
2107 fprintf(options->file, "-\t-\t");
2108 else
2109 fprintf(options->file,
2110 "%"PRIuMAX"\t%"PRIuMAX"\t",
2111 file->added, file->deleted);
2112 if (options->line_termination) {
2113 fill_print_name(file);
2114 if (!file->is_renamed)
2115 write_name_quoted(file->name, options->file,
2116 options->line_termination);
2117 else {
2118 fputs(file->print_name, options->file);
2119 putc(options->line_termination, options->file);
2120 }
2121 } else {
2122 if (file->is_renamed) {
2123 putc('\0', options->file);
2124 write_name_quoted(file->from_name, options->file, '\0');
2125 }
2126 write_name_quoted(file->name, options->file, '\0');
2127 }
2128 }
2129}
2130
2131struct dirstat_file {
2132 const char *name;
2133 unsigned long changed;
2134};
2135
2136struct dirstat_dir {
2137 struct dirstat_file *files;
2138 int alloc, nr, permille, cumulative;
2139};
2140
2141static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2142 unsigned long changed, const char *base, int baselen)
2143{
2144 unsigned long this_dir = 0;
2145 unsigned int sources = 0;
2146 const char *line_prefix = diff_line_prefix(opt);
2147
2148 while (dir->nr) {
2149 struct dirstat_file *f = dir->files;
2150 int namelen = strlen(f->name);
2151 unsigned long this;
2152 char *slash;
2153
2154 if (namelen < baselen)
2155 break;
2156 if (memcmp(f->name, base, baselen))
2157 break;
2158 slash = strchr(f->name + baselen, '/');
2159 if (slash) {
2160 int newbaselen = slash + 1 - f->name;
2161 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2162 sources++;
2163 } else {
2164 this = f->changed;
2165 dir->files++;
2166 dir->nr--;
2167 sources += 2;
2168 }
2169 this_dir += this;
2170 }
2171
2172 /*
2173 * We don't report dirstat's for
2174 * - the top level
2175 * - or cases where everything came from a single directory
2176 * under this directory (sources == 1).
2177 */
2178 if (baselen && sources != 1) {
2179 if (this_dir) {
2180 int permille = this_dir * 1000 / changed;
2181 if (permille >= dir->permille) {
2182 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2183 permille / 10, permille % 10, baselen, base);
2184 if (!dir->cumulative)
2185 return 0;
2186 }
2187 }
2188 }
2189 return this_dir;
2190}
2191
2192static int dirstat_compare(const void *_a, const void *_b)
2193{
2194 const struct dirstat_file *a = _a;
2195 const struct dirstat_file *b = _b;
2196 return strcmp(a->name, b->name);
2197}
2198
2199static void show_dirstat(struct diff_options *options)
2200{
2201 int i;
2202 unsigned long changed;
2203 struct dirstat_dir dir;
2204 struct diff_queue_struct *q = &diff_queued_diff;
2205
2206 dir.files = NULL;
2207 dir.alloc = 0;
2208 dir.nr = 0;
2209 dir.permille = options->dirstat_permille;
2210 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2211
2212 changed = 0;
2213 for (i = 0; i < q->nr; i++) {
2214 struct diff_filepair *p = q->queue[i];
2215 const char *name;
2216 unsigned long copied, added, damage;
2217 int content_changed;
2218
2219 name = p->two->path ? p->two->path : p->one->path;
2220
2221 if (p->one->oid_valid && p->two->oid_valid)
2222 content_changed = oidcmp(&p->one->oid, &p->two->oid);
2223 else
2224 content_changed = 1;
2225
2226 if (!content_changed) {
2227 /*
2228 * The SHA1 has not changed, so pre-/post-content is
2229 * identical. We can therefore skip looking at the
2230 * file contents altogether.
2231 */
2232 damage = 0;
2233 goto found_damage;
2234 }
2235
2236 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
2237 /*
2238 * In --dirstat-by-file mode, we don't really need to
2239 * look at the actual file contents at all.
2240 * The fact that the SHA1 changed is enough for us to
2241 * add this file to the list of results
2242 * (with each file contributing equal damage).
2243 */
2244 damage = 1;
2245 goto found_damage;
2246 }
2247
2248 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
2249 diff_populate_filespec(p->one, 0);
2250 diff_populate_filespec(p->two, 0);
2251 diffcore_count_changes(p->one, p->two, NULL, NULL,
2252 &copied, &added);
2253 diff_free_filespec_data(p->one);
2254 diff_free_filespec_data(p->two);
2255 } else if (DIFF_FILE_VALID(p->one)) {
2256 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
2257 copied = added = 0;
2258 diff_free_filespec_data(p->one);
2259 } else if (DIFF_FILE_VALID(p->two)) {
2260 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
2261 copied = 0;
2262 added = p->two->size;
2263 diff_free_filespec_data(p->two);
2264 } else
2265 continue;
2266
2267 /*
2268 * Original minus copied is the removed material,
2269 * added is the new material. They are both damages
2270 * made to the preimage.
2271 * If the resulting damage is zero, we know that
2272 * diffcore_count_changes() considers the two entries to
2273 * be identical, but since content_changed is true, we
2274 * know that there must have been _some_ kind of change,
2275 * so we force all entries to have damage > 0.
2276 */
2277 damage = (p->one->size - copied) + added;
2278 if (!damage)
2279 damage = 1;
2280
2281found_damage:
2282 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2283 dir.files[dir.nr].name = name;
2284 dir.files[dir.nr].changed = damage;
2285 changed += damage;
2286 dir.nr++;
2287 }
2288
2289 /* This can happen even with many files, if everything was renames */
2290 if (!changed)
2291 return;
2292
2293 /* Show all directories with more than x% of the changes */
2294 QSORT(dir.files, dir.nr, dirstat_compare);
2295 gather_dirstat(options, &dir, changed, "", 0);
2296}
2297
2298static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
2299{
2300 int i;
2301 unsigned long changed;
2302 struct dirstat_dir dir;
2303
2304 if (data->nr == 0)
2305 return;
2306
2307 dir.files = NULL;
2308 dir.alloc = 0;
2309 dir.nr = 0;
2310 dir.permille = options->dirstat_permille;
2311 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2312
2313 changed = 0;
2314 for (i = 0; i < data->nr; i++) {
2315 struct diffstat_file *file = data->files[i];
2316 unsigned long damage = file->added + file->deleted;
2317 if (file->is_binary)
2318 /*
2319 * binary files counts bytes, not lines. Must find some
2320 * way to normalize binary bytes vs. textual lines.
2321 * The following heuristic assumes that there are 64
2322 * bytes per "line".
2323 * This is stupid and ugly, but very cheap...
2324 */
2325 damage = (damage + 63) / 64;
2326 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2327 dir.files[dir.nr].name = file->name;
2328 dir.files[dir.nr].changed = damage;
2329 changed += damage;
2330 dir.nr++;
2331 }
2332
2333 /* This can happen even with many files, if everything was renames */
2334 if (!changed)
2335 return;
2336
2337 /* Show all directories with more than x% of the changes */
2338 QSORT(dir.files, dir.nr, dirstat_compare);
2339 gather_dirstat(options, &dir, changed, "", 0);
2340}
2341
2342static void free_diffstat_info(struct diffstat_t *diffstat)
2343{
2344 int i;
2345 for (i = 0; i < diffstat->nr; i++) {
2346 struct diffstat_file *f = diffstat->files[i];
2347 if (f->name != f->print_name)
2348 free(f->print_name);
2349 free(f->name);
2350 free(f->from_name);
2351 free(f);
2352 }
2353 free(diffstat->files);
2354}
2355
2356struct checkdiff_t {
2357 const char *filename;
2358 int lineno;
2359 int conflict_marker_size;
2360 struct diff_options *o;
2361 unsigned ws_rule;
2362 unsigned status;
2363};
2364
2365static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2366{
2367 char firstchar;
2368 int cnt;
2369
2370 if (len < marker_size + 1)
2371 return 0;
2372 firstchar = line[0];
2373 switch (firstchar) {
2374 case '=': case '>': case '<': case '|':
2375 break;
2376 default:
2377 return 0;
2378 }
2379 for (cnt = 1; cnt < marker_size; cnt++)
2380 if (line[cnt] != firstchar)
2381 return 0;
2382 /* line[1] thru line[marker_size-1] are same as firstchar */
2383 if (len < marker_size + 1 || !isspace(line[marker_size]))
2384 return 0;
2385 return 1;
2386}
2387
2388static void checkdiff_consume(void *priv, char *line, unsigned long len)
2389{
2390 struct checkdiff_t *data = priv;
2391 int marker_size = data->conflict_marker_size;
2392 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2393 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2394 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2395 char *err;
2396 const char *line_prefix;
2397
2398 assert(data->o);
2399 line_prefix = diff_line_prefix(data->o);
2400
2401 if (line[0] == '+') {
2402 unsigned bad;
2403 data->lineno++;
2404 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2405 data->status |= 1;
2406 fprintf(data->o->file,
2407 "%s%s:%d: leftover conflict marker\n",
2408 line_prefix, data->filename, data->lineno);
2409 }
2410 bad = ws_check(line + 1, len - 1, data->ws_rule);
2411 if (!bad)
2412 return;
2413 data->status |= bad;
2414 err = whitespace_error_string(bad);
2415 fprintf(data->o->file, "%s%s:%d: %s.\n",
2416 line_prefix, data->filename, data->lineno, err);
2417 free(err);
2418 emit_line(data->o, set, reset, line, 1);
2419 ws_check_emit(line + 1, len - 1, data->ws_rule,
2420 data->o->file, set, reset, ws);
2421 } else if (line[0] == ' ') {
2422 data->lineno++;
2423 } else if (line[0] == '@') {
2424 char *plus = strchr(line, '+');
2425 if (plus)
2426 data->lineno = strtol(plus, NULL, 10) - 1;
2427 else
2428 die("invalid diff");
2429 }
2430}
2431
2432static unsigned char *deflate_it(char *data,
2433 unsigned long size,
2434 unsigned long *result_size)
2435{
2436 int bound;
2437 unsigned char *deflated;
2438 git_zstream stream;
2439
2440 git_deflate_init(&stream, zlib_compression_level);
2441 bound = git_deflate_bound(&stream, size);
2442 deflated = xmalloc(bound);
2443 stream.next_out = deflated;
2444 stream.avail_out = bound;
2445
2446 stream.next_in = (unsigned char *)data;
2447 stream.avail_in = size;
2448 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2449 ; /* nothing */
2450 git_deflate_end(&stream);
2451 *result_size = stream.total_out;
2452 return deflated;
2453}
2454
2455static void emit_binary_diff_body(struct diff_options *o,
2456 mmfile_t *one, mmfile_t *two)
2457{
2458 void *cp;
2459 void *delta;
2460 void *deflated;
2461 void *data;
2462 unsigned long orig_size;
2463 unsigned long delta_size;
2464 unsigned long deflate_size;
2465 unsigned long data_size;
2466
2467 /* We could do deflated delta, or we could do just deflated two,
2468 * whichever is smaller.
2469 */
2470 delta = NULL;
2471 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2472 if (one->size && two->size) {
2473 delta = diff_delta(one->ptr, one->size,
2474 two->ptr, two->size,
2475 &delta_size, deflate_size);
2476 if (delta) {
2477 void *to_free = delta;
2478 orig_size = delta_size;
2479 delta = deflate_it(delta, delta_size, &delta_size);
2480 free(to_free);
2481 }
2482 }
2483
2484 if (delta && delta_size < deflate_size) {
2485 char *s = xstrfmt("%lu", orig_size);
2486 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
2487 s, strlen(s), 0);
2488 free(s);
2489 free(deflated);
2490 data = delta;
2491 data_size = delta_size;
2492 } else {
2493 char *s = xstrfmt("%lu", two->size);
2494 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
2495 s, strlen(s), 0);
2496 free(s);
2497 free(delta);
2498 data = deflated;
2499 data_size = deflate_size;
2500 }
2501
2502 /* emit data encoded in base85 */
2503 cp = data;
2504 while (data_size) {
2505 int len;
2506 int bytes = (52 < data_size) ? 52 : data_size;
2507 char line[71];
2508 data_size -= bytes;
2509 if (bytes <= 26)
2510 line[0] = bytes + 'A' - 1;
2511 else
2512 line[0] = bytes - 26 + 'a' - 1;
2513 encode_85(line + 1, cp, bytes);
2514 cp = (char *) cp + bytes;
2515
2516 len = strlen(line);
2517 line[len++] = '\n';
2518 line[len] = '\0';
2519
2520 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
2521 line, len, 0);
2522 }
2523 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
2524 free(data);
2525}
2526
2527static void emit_binary_diff(struct diff_options *o,
2528 mmfile_t *one, mmfile_t *two)
2529{
2530 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
2531 emit_binary_diff_body(o, one, two);
2532 emit_binary_diff_body(o, two, one);
2533}
2534
2535int diff_filespec_is_binary(struct diff_filespec *one)
2536{
2537 if (one->is_binary == -1) {
2538 diff_filespec_load_driver(one);
2539 if (one->driver->binary != -1)
2540 one->is_binary = one->driver->binary;
2541 else {
2542 if (!one->data && DIFF_FILE_VALID(one))
2543 diff_populate_filespec(one, CHECK_BINARY);
2544 if (one->is_binary == -1 && one->data)
2545 one->is_binary = buffer_is_binary(one->data,
2546 one->size);
2547 if (one->is_binary == -1)
2548 one->is_binary = 0;
2549 }
2550 }
2551 return one->is_binary;
2552}
2553
2554static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2555{
2556 diff_filespec_load_driver(one);
2557 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2558}
2559
2560void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2561{
2562 if (!options->a_prefix)
2563 options->a_prefix = a;
2564 if (!options->b_prefix)
2565 options->b_prefix = b;
2566}
2567
2568struct userdiff_driver *get_textconv(struct diff_filespec *one)
2569{
2570 if (!DIFF_FILE_VALID(one))
2571 return NULL;
2572
2573 diff_filespec_load_driver(one);
2574 return userdiff_get_textconv(one->driver);
2575}
2576
2577static void builtin_diff(const char *name_a,
2578 const char *name_b,
2579 struct diff_filespec *one,
2580 struct diff_filespec *two,
2581 const char *xfrm_msg,
2582 int must_show_header,
2583 struct diff_options *o,
2584 int complete_rewrite)
2585{
2586 mmfile_t mf1, mf2;
2587 const char *lbl[2];
2588 char *a_one, *b_two;
2589 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2590 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2591 const char *a_prefix, *b_prefix;
2592 struct userdiff_driver *textconv_one = NULL;
2593 struct userdiff_driver *textconv_two = NULL;
2594 struct strbuf header = STRBUF_INIT;
2595 const char *line_prefix = diff_line_prefix(o);
2596
2597 diff_set_mnemonic_prefix(o, "a/", "b/");
2598 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2599 a_prefix = o->b_prefix;
2600 b_prefix = o->a_prefix;
2601 } else {
2602 a_prefix = o->a_prefix;
2603 b_prefix = o->b_prefix;
2604 }
2605
2606 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
2607 (!one->mode || S_ISGITLINK(one->mode)) &&
2608 (!two->mode || S_ISGITLINK(two->mode))) {
2609 show_submodule_summary(o, one->path ? one->path : two->path,
2610 &one->oid, &two->oid,
2611 two->dirty_submodule);
2612 return;
2613 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
2614 (!one->mode || S_ISGITLINK(one->mode)) &&
2615 (!two->mode || S_ISGITLINK(two->mode))) {
2616 show_submodule_inline_diff(o, one->path ? one->path : two->path,
2617 &one->oid, &two->oid,
2618 two->dirty_submodule);
2619 return;
2620 }
2621
2622 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2623 textconv_one = get_textconv(one);
2624 textconv_two = get_textconv(two);
2625 }
2626
2627 /* Never use a non-valid filename anywhere if at all possible */
2628 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2629 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2630
2631 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2632 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2633 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2634 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2635 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2636 if (lbl[0][0] == '/') {
2637 /* /dev/null */
2638 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2639 if (xfrm_msg)
2640 strbuf_addstr(&header, xfrm_msg);
2641 must_show_header = 1;
2642 }
2643 else if (lbl[1][0] == '/') {
2644 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2645 if (xfrm_msg)
2646 strbuf_addstr(&header, xfrm_msg);
2647 must_show_header = 1;
2648 }
2649 else {
2650 if (one->mode != two->mode) {
2651 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2652 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2653 must_show_header = 1;
2654 }
2655 if (xfrm_msg)
2656 strbuf_addstr(&header, xfrm_msg);
2657
2658 /*
2659 * we do not run diff between different kind
2660 * of objects.
2661 */
2662 if ((one->mode ^ two->mode) & S_IFMT)
2663 goto free_ab_and_return;
2664 if (complete_rewrite &&
2665 (textconv_one || !diff_filespec_is_binary(one)) &&
2666 (textconv_two || !diff_filespec_is_binary(two))) {
2667 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2668 header.buf, header.len, 0);
2669 strbuf_reset(&header);
2670 emit_rewrite_diff(name_a, name_b, one, two,
2671 textconv_one, textconv_two, o);
2672 o->found_changes = 1;
2673 goto free_ab_and_return;
2674 }
2675 }
2676
2677 if (o->irreversible_delete && lbl[1][0] == '/') {
2678 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
2679 header.len, 0);
2680 strbuf_reset(&header);
2681 goto free_ab_and_return;
2682 } else if (!DIFF_OPT_TST(o, TEXT) &&
2683 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2684 (!textconv_two && diff_filespec_is_binary(two)) )) {
2685 struct strbuf sb = STRBUF_INIT;
2686 if (!one->data && !two->data &&
2687 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2688 !DIFF_OPT_TST(o, BINARY)) {
2689 if (!oidcmp(&one->oid, &two->oid)) {
2690 if (must_show_header)
2691 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2692 header.buf, header.len,
2693 0);
2694 goto free_ab_and_return;
2695 }
2696 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2697 header.buf, header.len, 0);
2698 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
2699 diff_line_prefix(o), lbl[0], lbl[1]);
2700 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
2701 sb.buf, sb.len, 0);
2702 strbuf_release(&sb);
2703 goto free_ab_and_return;
2704 }
2705 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2706 die("unable to read files to diff");
2707 /* Quite common confusing case */
2708 if (mf1.size == mf2.size &&
2709 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2710 if (must_show_header)
2711 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2712 header.buf, header.len, 0);
2713 goto free_ab_and_return;
2714 }
2715 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
2716 strbuf_reset(&header);
2717 if (DIFF_OPT_TST(o, BINARY))
2718 emit_binary_diff(o, &mf1, &mf2);
2719 else {
2720 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
2721 diff_line_prefix(o), lbl[0], lbl[1]);
2722 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
2723 sb.buf, sb.len, 0);
2724 strbuf_release(&sb);
2725 }
2726 o->found_changes = 1;
2727 } else {
2728 /* Crazy xdl interfaces.. */
2729 const char *diffopts = getenv("GIT_DIFF_OPTS");
2730 const char *v;
2731 xpparam_t xpp;
2732 xdemitconf_t xecfg;
2733 struct emit_callback ecbdata;
2734 const struct userdiff_funcname *pe;
2735
2736 if (must_show_header) {
2737 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2738 header.buf, header.len, 0);
2739 strbuf_reset(&header);
2740 }
2741
2742 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2743 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2744
2745 pe = diff_funcname_pattern(one);
2746 if (!pe)
2747 pe = diff_funcname_pattern(two);
2748
2749 memset(&xpp, 0, sizeof(xpp));
2750 memset(&xecfg, 0, sizeof(xecfg));
2751 memset(&ecbdata, 0, sizeof(ecbdata));
2752 ecbdata.label_path = lbl;
2753 ecbdata.color_diff = want_color(o->use_color);
2754 ecbdata.ws_rule = whitespace_rule(name_b);
2755 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2756 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2757 ecbdata.opt = o;
2758 ecbdata.header = header.len ? &header : NULL;
2759 xpp.flags = o->xdl_opts;
2760 xecfg.ctxlen = o->context;
2761 xecfg.interhunkctxlen = o->interhunkcontext;
2762 xecfg.flags = XDL_EMIT_FUNCNAMES;
2763 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2764 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2765 if (pe)
2766 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2767 if (!diffopts)
2768 ;
2769 else if (skip_prefix(diffopts, "--unified=", &v))
2770 xecfg.ctxlen = strtoul(v, NULL, 10);
2771 else if (skip_prefix(diffopts, "-u", &v))
2772 xecfg.ctxlen = strtoul(v, NULL, 10);
2773 if (o->word_diff)
2774 init_diff_words_data(&ecbdata, o, one, two);
2775 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2776 &xpp, &xecfg))
2777 die("unable to generate diff for %s", one->path);
2778 if (o->word_diff)
2779 free_diff_words_data(&ecbdata);
2780 if (textconv_one)
2781 free(mf1.ptr);
2782 if (textconv_two)
2783 free(mf2.ptr);
2784 xdiff_clear_find_func(&xecfg);
2785 }
2786
2787 free_ab_and_return:
2788 strbuf_release(&header);
2789 diff_free_filespec_data(one);
2790 diff_free_filespec_data(two);
2791 free(a_one);
2792 free(b_two);
2793 return;
2794}
2795
2796static void builtin_diffstat(const char *name_a, const char *name_b,
2797 struct diff_filespec *one,
2798 struct diff_filespec *two,
2799 struct diffstat_t *diffstat,
2800 struct diff_options *o,
2801 struct diff_filepair *p)
2802{
2803 mmfile_t mf1, mf2;
2804 struct diffstat_file *data;
2805 int same_contents;
2806 int complete_rewrite = 0;
2807
2808 if (!DIFF_PAIR_UNMERGED(p)) {
2809 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2810 complete_rewrite = 1;
2811 }
2812
2813 data = diffstat_add(diffstat, name_a, name_b);
2814 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2815
2816 if (!one || !two) {
2817 data->is_unmerged = 1;
2818 return;
2819 }
2820
2821 same_contents = !oidcmp(&one->oid, &two->oid);
2822
2823 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2824 data->is_binary = 1;
2825 if (same_contents) {
2826 data->added = 0;
2827 data->deleted = 0;
2828 } else {
2829 data->added = diff_filespec_size(two);
2830 data->deleted = diff_filespec_size(one);
2831 }
2832 }
2833
2834 else if (complete_rewrite) {
2835 diff_populate_filespec(one, 0);
2836 diff_populate_filespec(two, 0);
2837 data->deleted = count_lines(one->data, one->size);
2838 data->added = count_lines(two->data, two->size);
2839 }
2840
2841 else if (!same_contents) {
2842 /* Crazy xdl interfaces.. */
2843 xpparam_t xpp;
2844 xdemitconf_t xecfg;
2845
2846 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2847 die("unable to read files to diff");
2848
2849 memset(&xpp, 0, sizeof(xpp));
2850 memset(&xecfg, 0, sizeof(xecfg));
2851 xpp.flags = o->xdl_opts;
2852 xecfg.ctxlen = o->context;
2853 xecfg.interhunkctxlen = o->interhunkcontext;
2854 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2855 &xpp, &xecfg))
2856 die("unable to generate diffstat for %s", one->path);
2857 }
2858
2859 diff_free_filespec_data(one);
2860 diff_free_filespec_data(two);
2861}
2862
2863static void builtin_checkdiff(const char *name_a, const char *name_b,
2864 const char *attr_path,
2865 struct diff_filespec *one,
2866 struct diff_filespec *two,
2867 struct diff_options *o)
2868{
2869 mmfile_t mf1, mf2;
2870 struct checkdiff_t data;
2871
2872 if (!two)
2873 return;
2874
2875 memset(&data, 0, sizeof(data));
2876 data.filename = name_b ? name_b : name_a;
2877 data.lineno = 0;
2878 data.o = o;
2879 data.ws_rule = whitespace_rule(attr_path);
2880 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2881
2882 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2883 die("unable to read files to diff");
2884
2885 /*
2886 * All the other codepaths check both sides, but not checking
2887 * the "old" side here is deliberate. We are checking the newly
2888 * introduced changes, and as long as the "new" side is text, we
2889 * can and should check what it introduces.
2890 */
2891 if (diff_filespec_is_binary(two))
2892 goto free_and_return;
2893 else {
2894 /* Crazy xdl interfaces.. */
2895 xpparam_t xpp;
2896 xdemitconf_t xecfg;
2897
2898 memset(&xpp, 0, sizeof(xpp));
2899 memset(&xecfg, 0, sizeof(xecfg));
2900 xecfg.ctxlen = 1; /* at least one context line */
2901 xpp.flags = 0;
2902 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2903 &xpp, &xecfg))
2904 die("unable to generate checkdiff for %s", one->path);
2905
2906 if (data.ws_rule & WS_BLANK_AT_EOF) {
2907 struct emit_callback ecbdata;
2908 int blank_at_eof;
2909
2910 ecbdata.ws_rule = data.ws_rule;
2911 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2912 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2913
2914 if (blank_at_eof) {
2915 static char *err;
2916 if (!err)
2917 err = whitespace_error_string(WS_BLANK_AT_EOF);
2918 fprintf(o->file, "%s:%d: %s.\n",
2919 data.filename, blank_at_eof, err);
2920 data.status = 1; /* report errors */
2921 }
2922 }
2923 }
2924 free_and_return:
2925 diff_free_filespec_data(one);
2926 diff_free_filespec_data(two);
2927 if (data.status)
2928 DIFF_OPT_SET(o, CHECK_FAILED);
2929}
2930
2931struct diff_filespec *alloc_filespec(const char *path)
2932{
2933 struct diff_filespec *spec;
2934
2935 FLEXPTR_ALLOC_STR(spec, path, path);
2936 spec->count = 1;
2937 spec->is_binary = -1;
2938 return spec;
2939}
2940
2941void free_filespec(struct diff_filespec *spec)
2942{
2943 if (!--spec->count) {
2944 diff_free_filespec_data(spec);
2945 free(spec);
2946 }
2947}
2948
2949void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
2950 int oid_valid, unsigned short mode)
2951{
2952 if (mode) {
2953 spec->mode = canon_mode(mode);
2954 oidcpy(&spec->oid, oid);
2955 spec->oid_valid = oid_valid;
2956 }
2957}
2958
2959/*
2960 * Given a name and sha1 pair, if the index tells us the file in
2961 * the work tree has that object contents, return true, so that
2962 * prepare_temp_file() does not have to inflate and extract.
2963 */
2964static int reuse_worktree_file(const char *name, const struct object_id *oid, int want_file)
2965{
2966 const struct cache_entry *ce;
2967 struct stat st;
2968 int pos, len;
2969
2970 /*
2971 * We do not read the cache ourselves here, because the
2972 * benchmark with my previous version that always reads cache
2973 * shows that it makes things worse for diff-tree comparing
2974 * two linux-2.6 kernel trees in an already checked out work
2975 * tree. This is because most diff-tree comparisons deal with
2976 * only a small number of files, while reading the cache is
2977 * expensive for a large project, and its cost outweighs the
2978 * savings we get by not inflating the object to a temporary
2979 * file. Practically, this code only helps when we are used
2980 * by diff-cache --cached, which does read the cache before
2981 * calling us.
2982 */
2983 if (!active_cache)
2984 return 0;
2985
2986 /* We want to avoid the working directory if our caller
2987 * doesn't need the data in a normal file, this system
2988 * is rather slow with its stat/open/mmap/close syscalls,
2989 * and the object is contained in a pack file. The pack
2990 * is probably already open and will be faster to obtain
2991 * the data through than the working directory. Loose
2992 * objects however would tend to be slower as they need
2993 * to be individually opened and inflated.
2994 */
2995 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(oid->hash))
2996 return 0;
2997
2998 /*
2999 * Similarly, if we'd have to convert the file contents anyway, that
3000 * makes the optimization not worthwhile.
3001 */
3002 if (!want_file && would_convert_to_git(&the_index, name))
3003 return 0;
3004
3005 len = strlen(name);
3006 pos = cache_name_pos(name, len);
3007 if (pos < 0)
3008 return 0;
3009 ce = active_cache[pos];
3010
3011 /*
3012 * This is not the sha1 we are looking for, or
3013 * unreusable because it is not a regular file.
3014 */
3015 if (oidcmp(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3016 return 0;
3017
3018 /*
3019 * If ce is marked as "assume unchanged", there is no
3020 * guarantee that work tree matches what we are looking for.
3021 */
3022 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3023 return 0;
3024
3025 /*
3026 * If ce matches the file in the work tree, we can reuse it.
3027 */
3028 if (ce_uptodate(ce) ||
3029 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
3030 return 1;
3031
3032 return 0;
3033}
3034
3035static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3036{
3037 struct strbuf buf = STRBUF_INIT;
3038 char *dirty = "";
3039
3040 /* Are we looking at the work tree? */
3041 if (s->dirty_submodule)
3042 dirty = "-dirty";
3043
3044 strbuf_addf(&buf, "Subproject commit %s%s\n",
3045 oid_to_hex(&s->oid), dirty);
3046 s->size = buf.len;
3047 if (size_only) {
3048 s->data = NULL;
3049 strbuf_release(&buf);
3050 } else {
3051 s->data = strbuf_detach(&buf, NULL);
3052 s->should_free = 1;
3053 }
3054 return 0;
3055}
3056
3057/*
3058 * While doing rename detection and pickaxe operation, we may need to
3059 * grab the data for the blob (or file) for our own in-core comparison.
3060 * diff_filespec has data and size fields for this purpose.
3061 */
3062int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
3063{
3064 int size_only = flags & CHECK_SIZE_ONLY;
3065 int err = 0;
3066 /*
3067 * demote FAIL to WARN to allow inspecting the situation
3068 * instead of refusing.
3069 */
3070 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
3071 ? SAFE_CRLF_WARN
3072 : safe_crlf);
3073
3074 if (!DIFF_FILE_VALID(s))
3075 die("internal error: asking to populate invalid file.");
3076 if (S_ISDIR(s->mode))
3077 return -1;
3078
3079 if (s->data)
3080 return 0;
3081
3082 if (size_only && 0 < s->size)
3083 return 0;
3084
3085 if (S_ISGITLINK(s->mode))
3086 return diff_populate_gitlink(s, size_only);
3087
3088 if (!s->oid_valid ||
3089 reuse_worktree_file(s->path, &s->oid, 0)) {
3090 struct strbuf buf = STRBUF_INIT;
3091 struct stat st;
3092 int fd;
3093
3094 if (lstat(s->path, &st) < 0) {
3095 if (errno == ENOENT) {
3096 err_empty:
3097 err = -1;
3098 empty:
3099 s->data = (char *)"";
3100 s->size = 0;
3101 return err;
3102 }
3103 }
3104 s->size = xsize_t(st.st_size);
3105 if (!s->size)
3106 goto empty;
3107 if (S_ISLNK(st.st_mode)) {
3108 struct strbuf sb = STRBUF_INIT;
3109
3110 if (strbuf_readlink(&sb, s->path, s->size))
3111 goto err_empty;
3112 s->size = sb.len;
3113 s->data = strbuf_detach(&sb, NULL);
3114 s->should_free = 1;
3115 return 0;
3116 }
3117
3118 /*
3119 * Even if the caller would be happy with getting
3120 * only the size, we cannot return early at this
3121 * point if the path requires us to run the content
3122 * conversion.
3123 */
3124 if (size_only && !would_convert_to_git(&the_index, s->path))
3125 return 0;
3126
3127 /*
3128 * Note: this check uses xsize_t(st.st_size) that may
3129 * not be the true size of the blob after it goes
3130 * through convert_to_git(). This may not strictly be
3131 * correct, but the whole point of big_file_threshold
3132 * and is_binary check being that we want to avoid
3133 * opening the file and inspecting the contents, this
3134 * is probably fine.
3135 */
3136 if ((flags & CHECK_BINARY) &&
3137 s->size > big_file_threshold && s->is_binary == -1) {
3138 s->is_binary = 1;
3139 return 0;
3140 }
3141 fd = open(s->path, O_RDONLY);
3142 if (fd < 0)
3143 goto err_empty;
3144 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3145 close(fd);
3146 s->should_munmap = 1;
3147
3148 /*
3149 * Convert from working tree format to canonical git format
3150 */
3151 if (convert_to_git(&the_index, s->path, s->data, s->size, &buf, crlf_warn)) {
3152 size_t size = 0;
3153 munmap(s->data, s->size);
3154 s->should_munmap = 0;
3155 s->data = strbuf_detach(&buf, &size);
3156 s->size = size;
3157 s->should_free = 1;
3158 }
3159 }
3160 else {
3161 enum object_type type;
3162 if (size_only || (flags & CHECK_BINARY)) {
3163 type = sha1_object_info(s->oid.hash, &s->size);
3164 if (type < 0)
3165 die("unable to read %s",
3166 oid_to_hex(&s->oid));
3167 if (size_only)
3168 return 0;
3169 if (s->size > big_file_threshold && s->is_binary == -1) {
3170 s->is_binary = 1;
3171 return 0;
3172 }
3173 }
3174 s->data = read_sha1_file(s->oid.hash, &type, &s->size);
3175 if (!s->data)
3176 die("unable to read %s", oid_to_hex(&s->oid));
3177 s->should_free = 1;
3178 }
3179 return 0;
3180}
3181
3182void diff_free_filespec_blob(struct diff_filespec *s)
3183{
3184 if (s->should_free)
3185 free(s->data);
3186 else if (s->should_munmap)
3187 munmap(s->data, s->size);
3188
3189 if (s->should_free || s->should_munmap) {
3190 s->should_free = s->should_munmap = 0;
3191 s->data = NULL;
3192 }
3193}
3194
3195void diff_free_filespec_data(struct diff_filespec *s)
3196{
3197 diff_free_filespec_blob(s);
3198 FREE_AND_NULL(s->cnt_data);
3199}
3200
3201static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
3202 void *blob,
3203 unsigned long size,
3204 const struct object_id *oid,
3205 int mode)
3206{
3207 int fd;
3208 struct strbuf buf = STRBUF_INIT;
3209 struct strbuf template = STRBUF_INIT;
3210 char *path_dup = xstrdup(path);
3211 const char *base = basename(path_dup);
3212
3213 /* Generate "XXXXXX_basename.ext" */
3214 strbuf_addstr(&template, "XXXXXX_");
3215 strbuf_addstr(&template, base);
3216
3217 fd = mks_tempfile_ts(&temp->tempfile, template.buf, strlen(base) + 1);
3218 if (fd < 0)
3219 die_errno("unable to create temp-file");
3220 if (convert_to_working_tree(path,
3221 (const char *)blob, (size_t)size, &buf)) {
3222 blob = buf.buf;
3223 size = buf.len;
3224 }
3225 if (write_in_full(fd, blob, size) != size)
3226 die_errno("unable to write temp-file");
3227 close_tempfile(&temp->tempfile);
3228 temp->name = get_tempfile_path(&temp->tempfile);
3229 oid_to_hex_r(temp->hex, oid);
3230 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
3231 strbuf_release(&buf);
3232 strbuf_release(&template);
3233 free(path_dup);
3234}
3235
3236static struct diff_tempfile *prepare_temp_file(const char *name,
3237 struct diff_filespec *one)
3238{
3239 struct diff_tempfile *temp = claim_diff_tempfile();
3240
3241 if (!DIFF_FILE_VALID(one)) {
3242 not_a_valid_file:
3243 /* A '-' entry produces this for file-2, and
3244 * a '+' entry produces this for file-1.
3245 */
3246 temp->name = "/dev/null";
3247 xsnprintf(temp->hex, sizeof(temp->hex), ".");
3248 xsnprintf(temp->mode, sizeof(temp->mode), ".");
3249 return temp;
3250 }
3251
3252 if (!S_ISGITLINK(one->mode) &&
3253 (!one->oid_valid ||
3254 reuse_worktree_file(name, &one->oid, 1))) {
3255 struct stat st;
3256 if (lstat(name, &st) < 0) {
3257 if (errno == ENOENT)
3258 goto not_a_valid_file;
3259 die_errno("stat(%s)", name);
3260 }
3261 if (S_ISLNK(st.st_mode)) {
3262 struct strbuf sb = STRBUF_INIT;
3263 if (strbuf_readlink(&sb, name, st.st_size) < 0)
3264 die_errno("readlink(%s)", name);
3265 prep_temp_blob(name, temp, sb.buf, sb.len,
3266 (one->oid_valid ?
3267 &one->oid : &null_oid),
3268 (one->oid_valid ?
3269 one->mode : S_IFLNK));
3270 strbuf_release(&sb);
3271 }
3272 else {
3273 /* we can borrow from the file in the work tree */
3274 temp->name = name;
3275 if (!one->oid_valid)
3276 oid_to_hex_r(temp->hex, &null_oid);
3277 else
3278 oid_to_hex_r(temp->hex, &one->oid);
3279 /* Even though we may sometimes borrow the
3280 * contents from the work tree, we always want
3281 * one->mode. mode is trustworthy even when
3282 * !(one->oid_valid), as long as
3283 * DIFF_FILE_VALID(one).
3284 */
3285 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
3286 }
3287 return temp;
3288 }
3289 else {
3290 if (diff_populate_filespec(one, 0))
3291 die("cannot read data blob for %s", one->path);
3292 prep_temp_blob(name, temp, one->data, one->size,
3293 &one->oid, one->mode);
3294 }
3295 return temp;
3296}
3297
3298static void add_external_diff_name(struct argv_array *argv,
3299 const char *name,
3300 struct diff_filespec *df)
3301{
3302 struct diff_tempfile *temp = prepare_temp_file(name, df);
3303 argv_array_push(argv, temp->name);
3304 argv_array_push(argv, temp->hex);
3305 argv_array_push(argv, temp->mode);
3306}
3307
3308/* An external diff command takes:
3309 *
3310 * diff-cmd name infile1 infile1-sha1 infile1-mode \
3311 * infile2 infile2-sha1 infile2-mode [ rename-to ]
3312 *
3313 */
3314static void run_external_diff(const char *pgm,
3315 const char *name,
3316 const char *other,
3317 struct diff_filespec *one,
3318 struct diff_filespec *two,
3319 const char *xfrm_msg,
3320 int complete_rewrite,
3321 struct diff_options *o)
3322{
3323 struct argv_array argv = ARGV_ARRAY_INIT;
3324 struct argv_array env = ARGV_ARRAY_INIT;
3325 struct diff_queue_struct *q = &diff_queued_diff;
3326
3327 argv_array_push(&argv, pgm);
3328 argv_array_push(&argv, name);
3329
3330 if (one && two) {
3331 add_external_diff_name(&argv, name, one);
3332 if (!other)
3333 add_external_diff_name(&argv, name, two);
3334 else {
3335 add_external_diff_name(&argv, other, two);
3336 argv_array_push(&argv, other);
3337 argv_array_push(&argv, xfrm_msg);
3338 }
3339 }
3340
3341 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
3342 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
3343
3344 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
3345 die(_("external diff died, stopping at %s"), name);
3346
3347 remove_tempfile();
3348 argv_array_clear(&argv);
3349 argv_array_clear(&env);
3350}
3351
3352static int similarity_index(struct diff_filepair *p)
3353{
3354 return p->score * 100 / MAX_SCORE;
3355}
3356
3357static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
3358{
3359 if (startup_info->have_repository)
3360 return find_unique_abbrev(oid->hash, abbrev);
3361 else {
3362 char *hex = oid_to_hex(oid);
3363 if (abbrev < 0)
3364 abbrev = FALLBACK_DEFAULT_ABBREV;
3365 if (abbrev > GIT_SHA1_HEXSZ)
3366 die("BUG: oid abbreviation out of range: %d", abbrev);
3367 if (abbrev)
3368 hex[abbrev] = '\0';
3369 return hex;
3370 }
3371}
3372
3373static void fill_metainfo(struct strbuf *msg,
3374 const char *name,
3375 const char *other,
3376 struct diff_filespec *one,
3377 struct diff_filespec *two,
3378 struct diff_options *o,
3379 struct diff_filepair *p,
3380 int *must_show_header,
3381 int use_color)
3382{
3383 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3384 const char *reset = diff_get_color(use_color, DIFF_RESET);
3385 const char *line_prefix = diff_line_prefix(o);
3386
3387 *must_show_header = 1;
3388 strbuf_init(msg, PATH_MAX * 2 + 300);
3389 switch (p->status) {
3390 case DIFF_STATUS_COPIED:
3391 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3392 line_prefix, set, similarity_index(p));
3393 strbuf_addf(msg, "%s\n%s%scopy from ",
3394 reset, line_prefix, set);
3395 quote_c_style(name, msg, NULL, 0);
3396 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3397 quote_c_style(other, msg, NULL, 0);
3398 strbuf_addf(msg, "%s\n", reset);
3399 break;
3400 case DIFF_STATUS_RENAMED:
3401 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3402 line_prefix, set, similarity_index(p));
3403 strbuf_addf(msg, "%s\n%s%srename from ",
3404 reset, line_prefix, set);
3405 quote_c_style(name, msg, NULL, 0);
3406 strbuf_addf(msg, "%s\n%s%srename to ",
3407 reset, line_prefix, set);
3408 quote_c_style(other, msg, NULL, 0);
3409 strbuf_addf(msg, "%s\n", reset);
3410 break;
3411 case DIFF_STATUS_MODIFIED:
3412 if (p->score) {
3413 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3414 line_prefix,
3415 set, similarity_index(p), reset);
3416 break;
3417 }
3418 /* fallthru */
3419 default:
3420 *must_show_header = 0;
3421 }
3422 if (one && two && oidcmp(&one->oid, &two->oid)) {
3423 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3424
3425 if (DIFF_OPT_TST(o, BINARY)) {
3426 mmfile_t mf;
3427 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3428 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3429 abbrev = 40;
3430 }
3431 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
3432 diff_abbrev_oid(&one->oid, abbrev),
3433 diff_abbrev_oid(&two->oid, abbrev));
3434 if (one->mode == two->mode)
3435 strbuf_addf(msg, " %06o", one->mode);
3436 strbuf_addf(msg, "%s\n", reset);
3437 }
3438}
3439
3440static void run_diff_cmd(const char *pgm,
3441 const char *name,
3442 const char *other,
3443 const char *attr_path,
3444 struct diff_filespec *one,
3445 struct diff_filespec *two,
3446 struct strbuf *msg,
3447 struct diff_options *o,
3448 struct diff_filepair *p)
3449{
3450 const char *xfrm_msg = NULL;
3451 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3452 int must_show_header = 0;
3453
3454
3455 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3456 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3457 if (drv && drv->external)
3458 pgm = drv->external;
3459 }
3460
3461 if (msg) {
3462 /*
3463 * don't use colors when the header is intended for an
3464 * external diff driver
3465 */
3466 fill_metainfo(msg, name, other, one, two, o, p,
3467 &must_show_header,
3468 want_color(o->use_color) && !pgm);
3469 xfrm_msg = msg->len ? msg->buf : NULL;
3470 }
3471
3472 if (pgm) {
3473 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3474 complete_rewrite, o);
3475 return;
3476 }
3477 if (one && two)
3478 builtin_diff(name, other ? other : name,
3479 one, two, xfrm_msg, must_show_header,
3480 o, complete_rewrite);
3481 else
3482 fprintf(o->file, "* Unmerged path %s\n", name);
3483}
3484
3485static void diff_fill_oid_info(struct diff_filespec *one)
3486{
3487 if (DIFF_FILE_VALID(one)) {
3488 if (!one->oid_valid) {
3489 struct stat st;
3490 if (one->is_stdin) {
3491 oidclr(&one->oid);
3492 return;
3493 }
3494 if (lstat(one->path, &st) < 0)
3495 die_errno("stat '%s'", one->path);
3496 if (index_path(one->oid.hash, one->path, &st, 0))
3497 die("cannot hash %s", one->path);
3498 }
3499 }
3500 else
3501 oidclr(&one->oid);
3502}
3503
3504static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3505{
3506 /* Strip the prefix but do not molest /dev/null and absolute paths */
3507 if (*namep && **namep != '/') {
3508 *namep += prefix_length;
3509 if (**namep == '/')
3510 ++*namep;
3511 }
3512 if (*otherp && **otherp != '/') {
3513 *otherp += prefix_length;
3514 if (**otherp == '/')
3515 ++*otherp;
3516 }
3517}
3518
3519static void run_diff(struct diff_filepair *p, struct diff_options *o)
3520{
3521 const char *pgm = external_diff();
3522 struct strbuf msg;
3523 struct diff_filespec *one = p->one;
3524 struct diff_filespec *two = p->two;
3525 const char *name;
3526 const char *other;
3527 const char *attr_path;
3528
3529 name = one->path;
3530 other = (strcmp(name, two->path) ? two->path : NULL);
3531 attr_path = name;
3532 if (o->prefix_length)
3533 strip_prefix(o->prefix_length, &name, &other);
3534
3535 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3536 pgm = NULL;
3537
3538 if (DIFF_PAIR_UNMERGED(p)) {
3539 run_diff_cmd(pgm, name, NULL, attr_path,
3540 NULL, NULL, NULL, o, p);
3541 return;
3542 }
3543
3544 diff_fill_oid_info(one);
3545 diff_fill_oid_info(two);
3546
3547 if (!pgm &&
3548 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3549 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3550 /*
3551 * a filepair that changes between file and symlink
3552 * needs to be split into deletion and creation.
3553 */
3554 struct diff_filespec *null = alloc_filespec(two->path);
3555 run_diff_cmd(NULL, name, other, attr_path,
3556 one, null, &msg, o, p);
3557 free(null);
3558 strbuf_release(&msg);
3559
3560 null = alloc_filespec(one->path);
3561 run_diff_cmd(NULL, name, other, attr_path,
3562 null, two, &msg, o, p);
3563 free(null);
3564 }
3565 else
3566 run_diff_cmd(pgm, name, other, attr_path,
3567 one, two, &msg, o, p);
3568
3569 strbuf_release(&msg);
3570}
3571
3572static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3573 struct diffstat_t *diffstat)
3574{
3575 const char *name;
3576 const char *other;
3577
3578 if (DIFF_PAIR_UNMERGED(p)) {
3579 /* unmerged */
3580 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3581 return;
3582 }
3583
3584 name = p->one->path;
3585 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3586
3587 if (o->prefix_length)
3588 strip_prefix(o->prefix_length, &name, &other);
3589
3590 diff_fill_oid_info(p->one);
3591 diff_fill_oid_info(p->two);
3592
3593 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3594}
3595
3596static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3597{
3598 const char *name;
3599 const char *other;
3600 const char *attr_path;
3601
3602 if (DIFF_PAIR_UNMERGED(p)) {
3603 /* unmerged */
3604 return;
3605 }
3606
3607 name = p->one->path;
3608 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3609 attr_path = other ? other : name;
3610
3611 if (o->prefix_length)
3612 strip_prefix(o->prefix_length, &name, &other);
3613
3614 diff_fill_oid_info(p->one);
3615 diff_fill_oid_info(p->two);
3616
3617 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3618}
3619
3620void diff_setup(struct diff_options *options)
3621{
3622 memcpy(options, &default_diff_options, sizeof(*options));
3623
3624 options->file = stdout;
3625
3626 options->abbrev = DEFAULT_ABBREV;
3627 options->line_termination = '\n';
3628 options->break_opt = -1;
3629 options->rename_limit = -1;
3630 options->dirstat_permille = diff_dirstat_permille_default;
3631 options->context = diff_context_default;
3632 options->interhunkcontext = diff_interhunk_context_default;
3633 options->ws_error_highlight = ws_error_highlight_default;
3634 DIFF_OPT_SET(options, RENAME_EMPTY);
3635
3636 /* pathchange left =NULL by default */
3637 options->change = diff_change;
3638 options->add_remove = diff_addremove;
3639 options->use_color = diff_use_color_default;
3640 options->detect_rename = diff_detect_rename_default;
3641 options->xdl_opts |= diff_algorithm;
3642 if (diff_indent_heuristic)
3643 DIFF_XDL_SET(options, INDENT_HEURISTIC);
3644
3645 options->orderfile = diff_order_file_cfg;
3646
3647 if (diff_no_prefix) {
3648 options->a_prefix = options->b_prefix = "";
3649 } else if (!diff_mnemonic_prefix) {
3650 options->a_prefix = "a/";
3651 options->b_prefix = "b/";
3652 }
3653}
3654
3655void diff_setup_done(struct diff_options *options)
3656{
3657 int count = 0;
3658
3659 if (options->set_default)
3660 options->set_default(options);
3661
3662 if (options->output_format & DIFF_FORMAT_NAME)
3663 count++;
3664 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3665 count++;
3666 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3667 count++;
3668 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3669 count++;
3670 if (count > 1)
3671 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
3672
3673 /*
3674 * Most of the time we can say "there are changes"
3675 * only by checking if there are changed paths, but
3676 * --ignore-whitespace* options force us to look
3677 * inside contents.
3678 */
3679
3680 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3681 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3682 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3683 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3684 else
3685 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3686
3687 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3688 options->detect_rename = DIFF_DETECT_COPY;
3689
3690 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3691 options->prefix = NULL;
3692 if (options->prefix)
3693 options->prefix_length = strlen(options->prefix);
3694 else
3695 options->prefix_length = 0;
3696
3697 if (options->output_format & (DIFF_FORMAT_NAME |
3698 DIFF_FORMAT_NAME_STATUS |
3699 DIFF_FORMAT_CHECKDIFF |
3700 DIFF_FORMAT_NO_OUTPUT))
3701 options->output_format &= ~(DIFF_FORMAT_RAW |
3702 DIFF_FORMAT_NUMSTAT |
3703 DIFF_FORMAT_DIFFSTAT |
3704 DIFF_FORMAT_SHORTSTAT |
3705 DIFF_FORMAT_DIRSTAT |
3706 DIFF_FORMAT_SUMMARY |
3707 DIFF_FORMAT_PATCH);
3708
3709 /*
3710 * These cases always need recursive; we do not drop caller-supplied
3711 * recursive bits for other formats here.
3712 */
3713 if (options->output_format & (DIFF_FORMAT_PATCH |
3714 DIFF_FORMAT_NUMSTAT |
3715 DIFF_FORMAT_DIFFSTAT |
3716 DIFF_FORMAT_SHORTSTAT |
3717 DIFF_FORMAT_DIRSTAT |
3718 DIFF_FORMAT_SUMMARY |
3719 DIFF_FORMAT_CHECKDIFF))
3720 DIFF_OPT_SET(options, RECURSIVE);
3721 /*
3722 * Also pickaxe would not work very well if you do not say recursive
3723 */
3724 if (options->pickaxe)
3725 DIFF_OPT_SET(options, RECURSIVE);
3726 /*
3727 * When patches are generated, submodules diffed against the work tree
3728 * must be checked for dirtiness too so it can be shown in the output
3729 */
3730 if (options->output_format & DIFF_FORMAT_PATCH)
3731 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3732
3733 if (options->detect_rename && options->rename_limit < 0)
3734 options->rename_limit = diff_rename_limit_default;
3735 if (options->setup & DIFF_SETUP_USE_CACHE) {
3736 if (!active_cache)
3737 /* read-cache does not die even when it fails
3738 * so it is safe for us to do this here. Also
3739 * it does not smudge active_cache or active_nr
3740 * when it fails, so we do not have to worry about
3741 * cleaning it up ourselves either.
3742 */
3743 read_cache();
3744 }
3745 if (40 < options->abbrev)
3746 options->abbrev = 40; /* full */
3747
3748 /*
3749 * It does not make sense to show the first hit we happened
3750 * to have found. It does not make sense not to return with
3751 * exit code in such a case either.
3752 */
3753 if (DIFF_OPT_TST(options, QUICK)) {
3754 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3755 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3756 }
3757
3758 options->diff_path_counter = 0;
3759
3760 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3761 die(_("--follow requires exactly one pathspec"));
3762}
3763
3764static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3765{
3766 char c, *eq;
3767 int len;
3768
3769 if (*arg != '-')
3770 return 0;
3771 c = *++arg;
3772 if (!c)
3773 return 0;
3774 if (c == arg_short) {
3775 c = *++arg;
3776 if (!c)
3777 return 1;
3778 if (val && isdigit(c)) {
3779 char *end;
3780 int n = strtoul(arg, &end, 10);
3781 if (*end)
3782 return 0;
3783 *val = n;
3784 return 1;
3785 }
3786 return 0;
3787 }
3788 if (c != '-')
3789 return 0;
3790 arg++;
3791 eq = strchrnul(arg, '=');
3792 len = eq - arg;
3793 if (!len || strncmp(arg, arg_long, len))
3794 return 0;
3795 if (*eq) {
3796 int n;
3797 char *end;
3798 if (!isdigit(*++eq))
3799 return 0;
3800 n = strtoul(eq, &end, 10);
3801 if (*end)
3802 return 0;
3803 *val = n;
3804 }
3805 return 1;
3806}
3807
3808static int diff_scoreopt_parse(const char *opt);
3809
3810static inline int short_opt(char opt, const char **argv,
3811 const char **optarg)
3812{
3813 const char *arg = argv[0];
3814 if (arg[0] != '-' || arg[1] != opt)
3815 return 0;
3816 if (arg[2] != '\0') {
3817 *optarg = arg + 2;
3818 return 1;
3819 }
3820 if (!argv[1])
3821 die("Option '%c' requires a value", opt);
3822 *optarg = argv[1];
3823 return 2;
3824}
3825
3826int parse_long_opt(const char *opt, const char **argv,
3827 const char **optarg)
3828{
3829 const char *arg = argv[0];
3830 if (!skip_prefix(arg, "--", &arg))
3831 return 0;
3832 if (!skip_prefix(arg, opt, &arg))
3833 return 0;
3834 if (*arg == '=') { /* stuck form: --option=value */
3835 *optarg = arg + 1;
3836 return 1;
3837 }
3838 if (*arg != '\0')
3839 return 0;
3840 /* separate form: --option value */
3841 if (!argv[1])
3842 die("Option '--%s' requires a value", opt);
3843 *optarg = argv[1];
3844 return 2;
3845}
3846
3847static int stat_opt(struct diff_options *options, const char **av)
3848{
3849 const char *arg = av[0];
3850 char *end;
3851 int width = options->stat_width;
3852 int name_width = options->stat_name_width;
3853 int graph_width = options->stat_graph_width;
3854 int count = options->stat_count;
3855 int argcount = 1;
3856
3857 if (!skip_prefix(arg, "--stat", &arg))
3858 die("BUG: stat option does not begin with --stat: %s", arg);
3859 end = (char *)arg;
3860
3861 switch (*arg) {
3862 case '-':
3863 if (skip_prefix(arg, "-width", &arg)) {
3864 if (*arg == '=')
3865 width = strtoul(arg + 1, &end, 10);
3866 else if (!*arg && !av[1])
3867 die_want_option("--stat-width");
3868 else if (!*arg) {
3869 width = strtoul(av[1], &end, 10);
3870 argcount = 2;
3871 }
3872 } else if (skip_prefix(arg, "-name-width", &arg)) {
3873 if (*arg == '=')
3874 name_width = strtoul(arg + 1, &end, 10);
3875 else if (!*arg && !av[1])
3876 die_want_option("--stat-name-width");
3877 else if (!*arg) {
3878 name_width = strtoul(av[1], &end, 10);
3879 argcount = 2;
3880 }
3881 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3882 if (*arg == '=')
3883 graph_width = strtoul(arg + 1, &end, 10);
3884 else if (!*arg && !av[1])
3885 die_want_option("--stat-graph-width");
3886 else if (!*arg) {
3887 graph_width = strtoul(av[1], &end, 10);
3888 argcount = 2;
3889 }
3890 } else if (skip_prefix(arg, "-count", &arg)) {
3891 if (*arg == '=')
3892 count = strtoul(arg + 1, &end, 10);
3893 else if (!*arg && !av[1])
3894 die_want_option("--stat-count");
3895 else if (!*arg) {
3896 count = strtoul(av[1], &end, 10);
3897 argcount = 2;
3898 }
3899 }
3900 break;
3901 case '=':
3902 width = strtoul(arg+1, &end, 10);
3903 if (*end == ',')
3904 name_width = strtoul(end+1, &end, 10);
3905 if (*end == ',')
3906 count = strtoul(end+1, &end, 10);
3907 }
3908
3909 /* Important! This checks all the error cases! */
3910 if (*end)
3911 return 0;
3912 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3913 options->stat_name_width = name_width;
3914 options->stat_graph_width = graph_width;
3915 options->stat_width = width;
3916 options->stat_count = count;
3917 return argcount;
3918}
3919
3920static int parse_dirstat_opt(struct diff_options *options, const char *params)
3921{
3922 struct strbuf errmsg = STRBUF_INIT;
3923 if (parse_dirstat_params(options, params, &errmsg))
3924 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3925 errmsg.buf);
3926 strbuf_release(&errmsg);
3927 /*
3928 * The caller knows a dirstat-related option is given from the command
3929 * line; allow it to say "return this_function();"
3930 */
3931 options->output_format |= DIFF_FORMAT_DIRSTAT;
3932 return 1;
3933}
3934
3935static int parse_submodule_opt(struct diff_options *options, const char *value)
3936{
3937 if (parse_submodule_params(options, value))
3938 die(_("Failed to parse --submodule option parameter: '%s'"),
3939 value);
3940 return 1;
3941}
3942
3943static const char diff_status_letters[] = {
3944 DIFF_STATUS_ADDED,
3945 DIFF_STATUS_COPIED,
3946 DIFF_STATUS_DELETED,
3947 DIFF_STATUS_MODIFIED,
3948 DIFF_STATUS_RENAMED,
3949 DIFF_STATUS_TYPE_CHANGED,
3950 DIFF_STATUS_UNKNOWN,
3951 DIFF_STATUS_UNMERGED,
3952 DIFF_STATUS_FILTER_AON,
3953 DIFF_STATUS_FILTER_BROKEN,
3954 '\0',
3955};
3956
3957static unsigned int filter_bit['Z' + 1];
3958
3959static void prepare_filter_bits(void)
3960{
3961 int i;
3962
3963 if (!filter_bit[DIFF_STATUS_ADDED]) {
3964 for (i = 0; diff_status_letters[i]; i++)
3965 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3966 }
3967}
3968
3969static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3970{
3971 return opt->filter & filter_bit[(int) status];
3972}
3973
3974static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3975{
3976 int i, optch;
3977
3978 prepare_filter_bits();
3979
3980 /*
3981 * If there is a negation e.g. 'd' in the input, and we haven't
3982 * initialized the filter field with another --diff-filter, start
3983 * from full set of bits, except for AON.
3984 */
3985 if (!opt->filter) {
3986 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3987 if (optch < 'a' || 'z' < optch)
3988 continue;
3989 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3990 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3991 break;
3992 }
3993 }
3994
3995 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3996 unsigned int bit;
3997 int negate;
3998
3999 if ('a' <= optch && optch <= 'z') {
4000 negate = 1;
4001 optch = toupper(optch);
4002 } else {
4003 negate = 0;
4004 }
4005
4006 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4007 if (!bit)
4008 return optarg[i];
4009 if (negate)
4010 opt->filter &= ~bit;
4011 else
4012 opt->filter |= bit;
4013 }
4014 return 0;
4015}
4016
4017static void enable_patch_output(int *fmt) {
4018 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4019 *fmt |= DIFF_FORMAT_PATCH;
4020}
4021
4022static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
4023{
4024 int val = parse_ws_error_highlight(arg);
4025
4026 if (val < 0) {
4027 error("unknown value after ws-error-highlight=%.*s",
4028 -1 - val, arg);
4029 return 0;
4030 }
4031 opt->ws_error_highlight = val;
4032 return 1;
4033}
4034
4035int diff_opt_parse(struct diff_options *options,
4036 const char **av, int ac, const char *prefix)
4037{
4038 const char *arg = av[0];
4039 const char *optarg;
4040 int argcount;
4041
4042 if (!prefix)
4043 prefix = "";
4044
4045 /* Output format options */
4046 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
4047 || opt_arg(arg, 'U', "unified", &options->context))
4048 enable_patch_output(&options->output_format);
4049 else if (!strcmp(arg, "--raw"))
4050 options->output_format |= DIFF_FORMAT_RAW;
4051 else if (!strcmp(arg, "--patch-with-raw")) {
4052 enable_patch_output(&options->output_format);
4053 options->output_format |= DIFF_FORMAT_RAW;
4054 } else if (!strcmp(arg, "--numstat"))
4055 options->output_format |= DIFF_FORMAT_NUMSTAT;
4056 else if (!strcmp(arg, "--shortstat"))
4057 options->output_format |= DIFF_FORMAT_SHORTSTAT;
4058 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
4059 return parse_dirstat_opt(options, "");
4060 else if (skip_prefix(arg, "-X", &arg))
4061 return parse_dirstat_opt(options, arg);
4062 else if (skip_prefix(arg, "--dirstat=", &arg))
4063 return parse_dirstat_opt(options, arg);
4064 else if (!strcmp(arg, "--cumulative"))
4065 return parse_dirstat_opt(options, "cumulative");
4066 else if (!strcmp(arg, "--dirstat-by-file"))
4067 return parse_dirstat_opt(options, "files");
4068 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
4069 parse_dirstat_opt(options, "files");
4070 return parse_dirstat_opt(options, arg);
4071 }
4072 else if (!strcmp(arg, "--check"))
4073 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4074 else if (!strcmp(arg, "--summary"))
4075 options->output_format |= DIFF_FORMAT_SUMMARY;
4076 else if (!strcmp(arg, "--patch-with-stat")) {
4077 enable_patch_output(&options->output_format);
4078 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4079 } else if (!strcmp(arg, "--name-only"))
4080 options->output_format |= DIFF_FORMAT_NAME;
4081 else if (!strcmp(arg, "--name-status"))
4082 options->output_format |= DIFF_FORMAT_NAME_STATUS;
4083 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
4084 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4085 else if (starts_with(arg, "--stat"))
4086 /* --stat, --stat-width, --stat-name-width, or --stat-count */
4087 return stat_opt(options, av);
4088
4089 /* renames options */
4090 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
4091 !strcmp(arg, "--break-rewrites")) {
4092 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
4093 return error("invalid argument to -B: %s", arg+2);
4094 }
4095 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
4096 !strcmp(arg, "--find-renames")) {
4097 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4098 return error("invalid argument to -M: %s", arg+2);
4099 options->detect_rename = DIFF_DETECT_RENAME;
4100 }
4101 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
4102 options->irreversible_delete = 1;
4103 }
4104 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
4105 !strcmp(arg, "--find-copies")) {
4106 if (options->detect_rename == DIFF_DETECT_COPY)
4107 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
4108 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4109 return error("invalid argument to -C: %s", arg+2);
4110 options->detect_rename = DIFF_DETECT_COPY;
4111 }
4112 else if (!strcmp(arg, "--no-renames"))
4113 options->detect_rename = 0;
4114 else if (!strcmp(arg, "--rename-empty"))
4115 DIFF_OPT_SET(options, RENAME_EMPTY);
4116 else if (!strcmp(arg, "--no-rename-empty"))
4117 DIFF_OPT_CLR(options, RENAME_EMPTY);
4118 else if (!strcmp(arg, "--relative"))
4119 DIFF_OPT_SET(options, RELATIVE_NAME);
4120 else if (skip_prefix(arg, "--relative=", &arg)) {
4121 DIFF_OPT_SET(options, RELATIVE_NAME);
4122 options->prefix = arg;
4123 }
4124
4125 /* xdiff options */
4126 else if (!strcmp(arg, "--minimal"))
4127 DIFF_XDL_SET(options, NEED_MINIMAL);
4128 else if (!strcmp(arg, "--no-minimal"))
4129 DIFF_XDL_CLR(options, NEED_MINIMAL);
4130 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
4131 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
4132 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
4133 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
4134 else if (!strcmp(arg, "--ignore-space-at-eol"))
4135 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
4136 else if (!strcmp(arg, "--ignore-blank-lines"))
4137 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
4138 else if (!strcmp(arg, "--indent-heuristic"))
4139 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4140 else if (!strcmp(arg, "--no-indent-heuristic"))
4141 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
4142 else if (!strcmp(arg, "--patience"))
4143 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4144 else if (!strcmp(arg, "--histogram"))
4145 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
4146 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
4147 long value = parse_algorithm_value(optarg);
4148 if (value < 0)
4149 return error("option diff-algorithm accepts \"myers\", "
4150 "\"minimal\", \"patience\" and \"histogram\"");
4151 /* clear out previous settings */
4152 DIFF_XDL_CLR(options, NEED_MINIMAL);
4153 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
4154 options->xdl_opts |= value;
4155 return argcount;
4156 }
4157
4158 /* flags options */
4159 else if (!strcmp(arg, "--binary")) {
4160 enable_patch_output(&options->output_format);
4161 DIFF_OPT_SET(options, BINARY);
4162 }
4163 else if (!strcmp(arg, "--full-index"))
4164 DIFF_OPT_SET(options, FULL_INDEX);
4165 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
4166 DIFF_OPT_SET(options, TEXT);
4167 else if (!strcmp(arg, "-R"))
4168 DIFF_OPT_SET(options, REVERSE_DIFF);
4169 else if (!strcmp(arg, "--find-copies-harder"))
4170 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
4171 else if (!strcmp(arg, "--follow"))
4172 DIFF_OPT_SET(options, FOLLOW_RENAMES);
4173 else if (!strcmp(arg, "--no-follow")) {
4174 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
4175 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
4176 } else if (!strcmp(arg, "--color"))
4177 options->use_color = 1;
4178 else if (skip_prefix(arg, "--color=", &arg)) {
4179 int value = git_config_colorbool(NULL, arg);
4180 if (value < 0)
4181 return error("option `color' expects \"always\", \"auto\", or \"never\"");
4182 options->use_color = value;
4183 }
4184 else if (!strcmp(arg, "--no-color"))
4185 options->use_color = 0;
4186 else if (!strcmp(arg, "--color-words")) {
4187 options->use_color = 1;
4188 options->word_diff = DIFF_WORDS_COLOR;
4189 }
4190 else if (skip_prefix(arg, "--color-words=", &arg)) {
4191 options->use_color = 1;
4192 options->word_diff = DIFF_WORDS_COLOR;
4193 options->word_regex = arg;
4194 }
4195 else if (!strcmp(arg, "--word-diff")) {
4196 if (options->word_diff == DIFF_WORDS_NONE)
4197 options->word_diff = DIFF_WORDS_PLAIN;
4198 }
4199 else if (skip_prefix(arg, "--word-diff=", &arg)) {
4200 if (!strcmp(arg, "plain"))
4201 options->word_diff = DIFF_WORDS_PLAIN;
4202 else if (!strcmp(arg, "color")) {
4203 options->use_color = 1;
4204 options->word_diff = DIFF_WORDS_COLOR;
4205 }
4206 else if (!strcmp(arg, "porcelain"))
4207 options->word_diff = DIFF_WORDS_PORCELAIN;
4208 else if (!strcmp(arg, "none"))
4209 options->word_diff = DIFF_WORDS_NONE;
4210 else
4211 die("bad --word-diff argument: %s", arg);
4212 }
4213 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
4214 if (options->word_diff == DIFF_WORDS_NONE)
4215 options->word_diff = DIFF_WORDS_PLAIN;
4216 options->word_regex = optarg;
4217 return argcount;
4218 }
4219 else if (!strcmp(arg, "--exit-code"))
4220 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
4221 else if (!strcmp(arg, "--quiet"))
4222 DIFF_OPT_SET(options, QUICK);
4223 else if (!strcmp(arg, "--ext-diff"))
4224 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
4225 else if (!strcmp(arg, "--no-ext-diff"))
4226 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
4227 else if (!strcmp(arg, "--textconv"))
4228 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
4229 else if (!strcmp(arg, "--no-textconv"))
4230 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
4231 else if (!strcmp(arg, "--ignore-submodules")) {
4232 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
4233 handle_ignore_submodules_arg(options, "all");
4234 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
4235 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
4236 handle_ignore_submodules_arg(options, arg);
4237 } else if (!strcmp(arg, "--submodule"))
4238 options->submodule_format = DIFF_SUBMODULE_LOG;
4239 else if (skip_prefix(arg, "--submodule=", &arg))
4240 return parse_submodule_opt(options, arg);
4241 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
4242 return parse_ws_error_highlight_opt(options, arg);
4243 else if (!strcmp(arg, "--ita-invisible-in-index"))
4244 options->ita_invisible_in_index = 1;
4245 else if (!strcmp(arg, "--ita-visible-in-index"))
4246 options->ita_invisible_in_index = 0;
4247
4248 /* misc options */
4249 else if (!strcmp(arg, "-z"))
4250 options->line_termination = 0;
4251 else if ((argcount = short_opt('l', av, &optarg))) {
4252 options->rename_limit = strtoul(optarg, NULL, 10);
4253 return argcount;
4254 }
4255 else if ((argcount = short_opt('S', av, &optarg))) {
4256 options->pickaxe = optarg;
4257 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
4258 return argcount;
4259 } else if ((argcount = short_opt('G', av, &optarg))) {
4260 options->pickaxe = optarg;
4261 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
4262 return argcount;
4263 }
4264 else if (!strcmp(arg, "--pickaxe-all"))
4265 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
4266 else if (!strcmp(arg, "--pickaxe-regex"))
4267 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
4268 else if ((argcount = short_opt('O', av, &optarg))) {
4269 options->orderfile = prefix_filename(prefix, optarg);
4270 return argcount;
4271 }
4272 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
4273 int offending = parse_diff_filter_opt(optarg, options);
4274 if (offending)
4275 die("unknown change class '%c' in --diff-filter=%s",
4276 offending, optarg);
4277 return argcount;
4278 }
4279 else if (!strcmp(arg, "--no-abbrev"))
4280 options->abbrev = 0;
4281 else if (!strcmp(arg, "--abbrev"))
4282 options->abbrev = DEFAULT_ABBREV;
4283 else if (skip_prefix(arg, "--abbrev=", &arg)) {
4284 options->abbrev = strtoul(arg, NULL, 10);
4285 if (options->abbrev < MINIMUM_ABBREV)
4286 options->abbrev = MINIMUM_ABBREV;
4287 else if (40 < options->abbrev)
4288 options->abbrev = 40;
4289 }
4290 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
4291 options->a_prefix = optarg;
4292 return argcount;
4293 }
4294 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
4295 options->line_prefix = optarg;
4296 options->line_prefix_length = strlen(options->line_prefix);
4297 graph_setup_line_prefix(options);
4298 return argcount;
4299 }
4300 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
4301 options->b_prefix = optarg;
4302 return argcount;
4303 }
4304 else if (!strcmp(arg, "--no-prefix"))
4305 options->a_prefix = options->b_prefix = "";
4306 else if (opt_arg(arg, '\0', "inter-hunk-context",
4307 &options->interhunkcontext))
4308 ;
4309 else if (!strcmp(arg, "-W"))
4310 DIFF_OPT_SET(options, FUNCCONTEXT);
4311 else if (!strcmp(arg, "--function-context"))
4312 DIFF_OPT_SET(options, FUNCCONTEXT);
4313 else if (!strcmp(arg, "--no-function-context"))
4314 DIFF_OPT_CLR(options, FUNCCONTEXT);
4315 else if ((argcount = parse_long_opt("output", av, &optarg))) {
4316 char *path = prefix_filename(prefix, optarg);
4317 options->file = xfopen(path, "w");
4318 options->close_file = 1;
4319 if (options->use_color != GIT_COLOR_ALWAYS)
4320 options->use_color = GIT_COLOR_NEVER;
4321 free(path);
4322 return argcount;
4323 } else
4324 return 0;
4325 return 1;
4326}
4327
4328int parse_rename_score(const char **cp_p)
4329{
4330 unsigned long num, scale;
4331 int ch, dot;
4332 const char *cp = *cp_p;
4333
4334 num = 0;
4335 scale = 1;
4336 dot = 0;
4337 for (;;) {
4338 ch = *cp;
4339 if ( !dot && ch == '.' ) {
4340 scale = 1;
4341 dot = 1;
4342 } else if ( ch == '%' ) {
4343 scale = dot ? scale*100 : 100;
4344 cp++; /* % is always at the end */
4345 break;
4346 } else if ( ch >= '0' && ch <= '9' ) {
4347 if ( scale < 100000 ) {
4348 scale *= 10;
4349 num = (num*10) + (ch-'0');
4350 }
4351 } else {
4352 break;
4353 }
4354 cp++;
4355 }
4356 *cp_p = cp;
4357
4358 /* user says num divided by scale and we say internally that
4359 * is MAX_SCORE * num / scale.
4360 */
4361 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
4362}
4363
4364static int diff_scoreopt_parse(const char *opt)
4365{
4366 int opt1, opt2, cmd;
4367
4368 if (*opt++ != '-')
4369 return -1;
4370 cmd = *opt++;
4371 if (cmd == '-') {
4372 /* convert the long-form arguments into short-form versions */
4373 if (skip_prefix(opt, "break-rewrites", &opt)) {
4374 if (*opt == 0 || *opt++ == '=')
4375 cmd = 'B';
4376 } else if (skip_prefix(opt, "find-copies", &opt)) {
4377 if (*opt == 0 || *opt++ == '=')
4378 cmd = 'C';
4379 } else if (skip_prefix(opt, "find-renames", &opt)) {
4380 if (*opt == 0 || *opt++ == '=')
4381 cmd = 'M';
4382 }
4383 }
4384 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4385 return -1; /* that is not a -M, -C, or -B option */
4386
4387 opt1 = parse_rename_score(&opt);
4388 if (cmd != 'B')
4389 opt2 = 0;
4390 else {
4391 if (*opt == 0)
4392 opt2 = 0;
4393 else if (*opt != '/')
4394 return -1; /* we expect -B80/99 or -B80 */
4395 else {
4396 opt++;
4397 opt2 = parse_rename_score(&opt);
4398 }
4399 }
4400 if (*opt != 0)
4401 return -1;
4402 return opt1 | (opt2 << 16);
4403}
4404
4405struct diff_queue_struct diff_queued_diff;
4406
4407void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4408{
4409 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4410 queue->queue[queue->nr++] = dp;
4411}
4412
4413struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4414 struct diff_filespec *one,
4415 struct diff_filespec *two)
4416{
4417 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4418 dp->one = one;
4419 dp->two = two;
4420 if (queue)
4421 diff_q(queue, dp);
4422 return dp;
4423}
4424
4425void diff_free_filepair(struct diff_filepair *p)
4426{
4427 free_filespec(p->one);
4428 free_filespec(p->two);
4429 free(p);
4430}
4431
4432const char *diff_aligned_abbrev(const struct object_id *oid, int len)
4433{
4434 int abblen;
4435 const char *abbrev;
4436
4437 if (len == GIT_SHA1_HEXSZ)
4438 return oid_to_hex(oid);
4439
4440 abbrev = diff_abbrev_oid(oid, len);
4441 abblen = strlen(abbrev);
4442
4443 /*
4444 * In well-behaved cases, where the abbbreviated result is the
4445 * same as the requested length, append three dots after the
4446 * abbreviation (hence the whole logic is limited to the case
4447 * where abblen < 37); when the actual abbreviated result is a
4448 * bit longer than the requested length, we reduce the number
4449 * of dots so that they match the well-behaved ones. However,
4450 * if the actual abbreviation is longer than the requested
4451 * length by more than three, we give up on aligning, and add
4452 * three dots anyway, to indicate that the output is not the
4453 * full object name. Yes, this may be suboptimal, but this
4454 * appears only in "diff --raw --abbrev" output and it is not
4455 * worth the effort to change it now. Note that this would
4456 * likely to work fine when the automatic sizing of default
4457 * abbreviation length is used--we would be fed -1 in "len" in
4458 * that case, and will end up always appending three-dots, but
4459 * the automatic sizing is supposed to give abblen that ensures
4460 * uniqueness across all objects (statistically speaking).
4461 */
4462 if (abblen < GIT_SHA1_HEXSZ - 3) {
4463 static char hex[GIT_MAX_HEXSZ + 1];
4464 if (len < abblen && abblen <= len + 2)
4465 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
4466 else
4467 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
4468 return hex;
4469 }
4470
4471 return oid_to_hex(oid);
4472}
4473
4474static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4475{
4476 int line_termination = opt->line_termination;
4477 int inter_name_termination = line_termination ? '\t' : '\0';
4478
4479 fprintf(opt->file, "%s", diff_line_prefix(opt));
4480 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4481 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4482 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
4483 fprintf(opt->file, "%s ",
4484 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
4485 }
4486 if (p->score) {
4487 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4488 inter_name_termination);
4489 } else {
4490 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4491 }
4492
4493 if (p->status == DIFF_STATUS_COPIED ||
4494 p->status == DIFF_STATUS_RENAMED) {
4495 const char *name_a, *name_b;
4496 name_a = p->one->path;
4497 name_b = p->two->path;
4498 strip_prefix(opt->prefix_length, &name_a, &name_b);
4499 write_name_quoted(name_a, opt->file, inter_name_termination);
4500 write_name_quoted(name_b, opt->file, line_termination);
4501 } else {
4502 const char *name_a, *name_b;
4503 name_a = p->one->mode ? p->one->path : p->two->path;
4504 name_b = NULL;
4505 strip_prefix(opt->prefix_length, &name_a, &name_b);
4506 write_name_quoted(name_a, opt->file, line_termination);
4507 }
4508}
4509
4510int diff_unmodified_pair(struct diff_filepair *p)
4511{
4512 /* This function is written stricter than necessary to support
4513 * the currently implemented transformers, but the idea is to
4514 * let transformers to produce diff_filepairs any way they want,
4515 * and filter and clean them up here before producing the output.
4516 */
4517 struct diff_filespec *one = p->one, *two = p->two;
4518
4519 if (DIFF_PAIR_UNMERGED(p))
4520 return 0; /* unmerged is interesting */
4521
4522 /* deletion, addition, mode or type change
4523 * and rename are all interesting.
4524 */
4525 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4526 DIFF_PAIR_MODE_CHANGED(p) ||
4527 strcmp(one->path, two->path))
4528 return 0;
4529
4530 /* both are valid and point at the same path. that is, we are
4531 * dealing with a change.
4532 */
4533 if (one->oid_valid && two->oid_valid &&
4534 !oidcmp(&one->oid, &two->oid) &&
4535 !one->dirty_submodule && !two->dirty_submodule)
4536 return 1; /* no change */
4537 if (!one->oid_valid && !two->oid_valid)
4538 return 1; /* both look at the same file on the filesystem. */
4539 return 0;
4540}
4541
4542static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4543{
4544 if (diff_unmodified_pair(p))
4545 return;
4546
4547 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4548 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4549 return; /* no tree diffs in patch format */
4550
4551 run_diff(p, o);
4552}
4553
4554static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4555 struct diffstat_t *diffstat)
4556{
4557 if (diff_unmodified_pair(p))
4558 return;
4559
4560 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4561 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4562 return; /* no useful stat for tree diffs */
4563
4564 run_diffstat(p, o, diffstat);
4565}
4566
4567static void diff_flush_checkdiff(struct diff_filepair *p,
4568 struct diff_options *o)
4569{
4570 if (diff_unmodified_pair(p))
4571 return;
4572
4573 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4574 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4575 return; /* nothing to check in tree diffs */
4576
4577 run_checkdiff(p, o);
4578}
4579
4580int diff_queue_is_empty(void)
4581{
4582 struct diff_queue_struct *q = &diff_queued_diff;
4583 int i;
4584 for (i = 0; i < q->nr; i++)
4585 if (!diff_unmodified_pair(q->queue[i]))
4586 return 0;
4587 return 1;
4588}
4589
4590#if DIFF_DEBUG
4591void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4592{
4593 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4594 x, one ? one : "",
4595 s->path,
4596 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4597 s->mode,
4598 s->oid_valid ? oid_to_hex(&s->oid) : "");
4599 fprintf(stderr, "queue[%d] %s size %lu\n",
4600 x, one ? one : "",
4601 s->size);
4602}
4603
4604void diff_debug_filepair(const struct diff_filepair *p, int i)
4605{
4606 diff_debug_filespec(p->one, i, "one");
4607 diff_debug_filespec(p->two, i, "two");
4608 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4609 p->score, p->status ? p->status : '?',
4610 p->one->rename_used, p->broken_pair);
4611}
4612
4613void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4614{
4615 int i;
4616 if (msg)
4617 fprintf(stderr, "%s\n", msg);
4618 fprintf(stderr, "q->nr = %d\n", q->nr);
4619 for (i = 0; i < q->nr; i++) {
4620 struct diff_filepair *p = q->queue[i];
4621 diff_debug_filepair(p, i);
4622 }
4623}
4624#endif
4625
4626static void diff_resolve_rename_copy(void)
4627{
4628 int i;
4629 struct diff_filepair *p;
4630 struct diff_queue_struct *q = &diff_queued_diff;
4631
4632 diff_debug_queue("resolve-rename-copy", q);
4633
4634 for (i = 0; i < q->nr; i++) {
4635 p = q->queue[i];
4636 p->status = 0; /* undecided */
4637 if (DIFF_PAIR_UNMERGED(p))
4638 p->status = DIFF_STATUS_UNMERGED;
4639 else if (!DIFF_FILE_VALID(p->one))
4640 p->status = DIFF_STATUS_ADDED;
4641 else if (!DIFF_FILE_VALID(p->two))
4642 p->status = DIFF_STATUS_DELETED;
4643 else if (DIFF_PAIR_TYPE_CHANGED(p))
4644 p->status = DIFF_STATUS_TYPE_CHANGED;
4645
4646 /* from this point on, we are dealing with a pair
4647 * whose both sides are valid and of the same type, i.e.
4648 * either in-place edit or rename/copy edit.
4649 */
4650 else if (DIFF_PAIR_RENAME(p)) {
4651 /*
4652 * A rename might have re-connected a broken
4653 * pair up, causing the pathnames to be the
4654 * same again. If so, that's not a rename at
4655 * all, just a modification..
4656 *
4657 * Otherwise, see if this source was used for
4658 * multiple renames, in which case we decrement
4659 * the count, and call it a copy.
4660 */
4661 if (!strcmp(p->one->path, p->two->path))
4662 p->status = DIFF_STATUS_MODIFIED;
4663 else if (--p->one->rename_used > 0)
4664 p->status = DIFF_STATUS_COPIED;
4665 else
4666 p->status = DIFF_STATUS_RENAMED;
4667 }
4668 else if (oidcmp(&p->one->oid, &p->two->oid) ||
4669 p->one->mode != p->two->mode ||
4670 p->one->dirty_submodule ||
4671 p->two->dirty_submodule ||
4672 is_null_oid(&p->one->oid))
4673 p->status = DIFF_STATUS_MODIFIED;
4674 else {
4675 /* This is a "no-change" entry and should not
4676 * happen anymore, but prepare for broken callers.
4677 */
4678 error("feeding unmodified %s to diffcore",
4679 p->one->path);
4680 p->status = DIFF_STATUS_UNKNOWN;
4681 }
4682 }
4683 diff_debug_queue("resolve-rename-copy done", q);
4684}
4685
4686static int check_pair_status(struct diff_filepair *p)
4687{
4688 switch (p->status) {
4689 case DIFF_STATUS_UNKNOWN:
4690 return 0;
4691 case 0:
4692 die("internal error in diff-resolve-rename-copy");
4693 default:
4694 return 1;
4695 }
4696}
4697
4698static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4699{
4700 int fmt = opt->output_format;
4701
4702 if (fmt & DIFF_FORMAT_CHECKDIFF)
4703 diff_flush_checkdiff(p, opt);
4704 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4705 diff_flush_raw(p, opt);
4706 else if (fmt & DIFF_FORMAT_NAME) {
4707 const char *name_a, *name_b;
4708 name_a = p->two->path;
4709 name_b = NULL;
4710 strip_prefix(opt->prefix_length, &name_a, &name_b);
4711 fprintf(opt->file, "%s", diff_line_prefix(opt));
4712 write_name_quoted(name_a, opt->file, opt->line_termination);
4713 }
4714}
4715
4716static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4717{
4718 if (fs->mode)
4719 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4720 else
4721 fprintf(file, " %s ", newdelete);
4722 write_name_quoted(fs->path, file, '\n');
4723}
4724
4725
4726static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4727 const char *line_prefix)
4728{
4729 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4730 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4731 p->two->mode, show_name ? ' ' : '\n');
4732 if (show_name) {
4733 write_name_quoted(p->two->path, file, '\n');
4734 }
4735 }
4736}
4737
4738static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4739 const char *line_prefix)
4740{
4741 char *names = pprint_rename(p->one->path, p->two->path);
4742
4743 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4744 free(names);
4745 show_mode_change(file, p, 0, line_prefix);
4746}
4747
4748static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4749{
4750 FILE *file = opt->file;
4751 const char *line_prefix = diff_line_prefix(opt);
4752
4753 switch(p->status) {
4754 case DIFF_STATUS_DELETED:
4755 fputs(line_prefix, file);
4756 show_file_mode_name(file, "delete", p->one);
4757 break;
4758 case DIFF_STATUS_ADDED:
4759 fputs(line_prefix, file);
4760 show_file_mode_name(file, "create", p->two);
4761 break;
4762 case DIFF_STATUS_COPIED:
4763 fputs(line_prefix, file);
4764 show_rename_copy(file, "copy", p, line_prefix);
4765 break;
4766 case DIFF_STATUS_RENAMED:
4767 fputs(line_prefix, file);
4768 show_rename_copy(file, "rename", p, line_prefix);
4769 break;
4770 default:
4771 if (p->score) {
4772 fprintf(file, "%s rewrite ", line_prefix);
4773 write_name_quoted(p->two->path, file, ' ');
4774 fprintf(file, "(%d%%)\n", similarity_index(p));
4775 }
4776 show_mode_change(file, p, !p->score, line_prefix);
4777 break;
4778 }
4779}
4780
4781struct patch_id_t {
4782 git_SHA_CTX *ctx;
4783 int patchlen;
4784};
4785
4786static int remove_space(char *line, int len)
4787{
4788 int i;
4789 char *dst = line;
4790 unsigned char c;
4791
4792 for (i = 0; i < len; i++)
4793 if (!isspace((c = line[i])))
4794 *dst++ = c;
4795
4796 return dst - line;
4797}
4798
4799static void patch_id_consume(void *priv, char *line, unsigned long len)
4800{
4801 struct patch_id_t *data = priv;
4802 int new_len;
4803
4804 /* Ignore line numbers when computing the SHA1 of the patch */
4805 if (starts_with(line, "@@ -"))
4806 return;
4807
4808 new_len = remove_space(line, len);
4809
4810 git_SHA1_Update(data->ctx, line, new_len);
4811 data->patchlen += new_len;
4812}
4813
4814static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
4815{
4816 git_SHA1_Update(ctx, str, strlen(str));
4817}
4818
4819static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
4820{
4821 /* large enough for 2^32 in octal */
4822 char buf[12];
4823 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
4824 git_SHA1_Update(ctx, buf, len);
4825}
4826
4827/* returns 0 upon success, and writes result into sha1 */
4828static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
4829{
4830 struct diff_queue_struct *q = &diff_queued_diff;
4831 int i;
4832 git_SHA_CTX ctx;
4833 struct patch_id_t data;
4834
4835 git_SHA1_Init(&ctx);
4836 memset(&data, 0, sizeof(struct patch_id_t));
4837 data.ctx = &ctx;
4838
4839 for (i = 0; i < q->nr; i++) {
4840 xpparam_t xpp;
4841 xdemitconf_t xecfg;
4842 mmfile_t mf1, mf2;
4843 struct diff_filepair *p = q->queue[i];
4844 int len1, len2;
4845
4846 memset(&xpp, 0, sizeof(xpp));
4847 memset(&xecfg, 0, sizeof(xecfg));
4848 if (p->status == 0)
4849 return error("internal diff status error");
4850 if (p->status == DIFF_STATUS_UNKNOWN)
4851 continue;
4852 if (diff_unmodified_pair(p))
4853 continue;
4854 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4855 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4856 continue;
4857 if (DIFF_PAIR_UNMERGED(p))
4858 continue;
4859
4860 diff_fill_oid_info(p->one);
4861 diff_fill_oid_info(p->two);
4862
4863 len1 = remove_space(p->one->path, strlen(p->one->path));
4864 len2 = remove_space(p->two->path, strlen(p->two->path));
4865 patch_id_add_string(&ctx, "diff--git");
4866 patch_id_add_string(&ctx, "a/");
4867 git_SHA1_Update(&ctx, p->one->path, len1);
4868 patch_id_add_string(&ctx, "b/");
4869 git_SHA1_Update(&ctx, p->two->path, len2);
4870
4871 if (p->one->mode == 0) {
4872 patch_id_add_string(&ctx, "newfilemode");
4873 patch_id_add_mode(&ctx, p->two->mode);
4874 patch_id_add_string(&ctx, "---/dev/null");
4875 patch_id_add_string(&ctx, "+++b/");
4876 git_SHA1_Update(&ctx, p->two->path, len2);
4877 } else if (p->two->mode == 0) {
4878 patch_id_add_string(&ctx, "deletedfilemode");
4879 patch_id_add_mode(&ctx, p->one->mode);
4880 patch_id_add_string(&ctx, "---a/");
4881 git_SHA1_Update(&ctx, p->one->path, len1);
4882 patch_id_add_string(&ctx, "+++/dev/null");
4883 } else {
4884 patch_id_add_string(&ctx, "---a/");
4885 git_SHA1_Update(&ctx, p->one->path, len1);
4886 patch_id_add_string(&ctx, "+++b/");
4887 git_SHA1_Update(&ctx, p->two->path, len2);
4888 }
4889
4890 if (diff_header_only)
4891 continue;
4892
4893 if (fill_mmfile(&mf1, p->one) < 0 ||
4894 fill_mmfile(&mf2, p->two) < 0)
4895 return error("unable to read files to diff");
4896
4897 if (diff_filespec_is_binary(p->one) ||
4898 diff_filespec_is_binary(p->two)) {
4899 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
4900 GIT_SHA1_HEXSZ);
4901 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
4902 GIT_SHA1_HEXSZ);
4903 continue;
4904 }
4905
4906 xpp.flags = 0;
4907 xecfg.ctxlen = 3;
4908 xecfg.flags = 0;
4909 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4910 &xpp, &xecfg))
4911 return error("unable to generate patch-id diff for %s",
4912 p->one->path);
4913 }
4914
4915 git_SHA1_Final(oid->hash, &ctx);
4916 return 0;
4917}
4918
4919int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
4920{
4921 struct diff_queue_struct *q = &diff_queued_diff;
4922 int i;
4923 int result = diff_get_patch_id(options, oid, diff_header_only);
4924
4925 for (i = 0; i < q->nr; i++)
4926 diff_free_filepair(q->queue[i]);
4927
4928 free(q->queue);
4929 DIFF_QUEUE_CLEAR(q);
4930
4931 return result;
4932}
4933
4934static int is_summary_empty(const struct diff_queue_struct *q)
4935{
4936 int i;
4937
4938 for (i = 0; i < q->nr; i++) {
4939 const struct diff_filepair *p = q->queue[i];
4940
4941 switch (p->status) {
4942 case DIFF_STATUS_DELETED:
4943 case DIFF_STATUS_ADDED:
4944 case DIFF_STATUS_COPIED:
4945 case DIFF_STATUS_RENAMED:
4946 return 0;
4947 default:
4948 if (p->score)
4949 return 0;
4950 if (p->one->mode && p->two->mode &&
4951 p->one->mode != p->two->mode)
4952 return 0;
4953 break;
4954 }
4955 }
4956 return 1;
4957}
4958
4959static const char rename_limit_warning[] =
4960N_("inexact rename detection was skipped due to too many files.");
4961
4962static const char degrade_cc_to_c_warning[] =
4963N_("only found copies from modified paths due to too many files.");
4964
4965static const char rename_limit_advice[] =
4966N_("you may want to set your %s variable to at least "
4967 "%d and retry the command.");
4968
4969void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4970{
4971 if (degraded_cc)
4972 warning(_(degrade_cc_to_c_warning));
4973 else if (needed)
4974 warning(_(rename_limit_warning));
4975 else
4976 return;
4977 if (0 < needed && needed < 32767)
4978 warning(_(rename_limit_advice), varname, needed);
4979}
4980
4981static void diff_flush_patch_all_file_pairs(struct diff_options *o)
4982{
4983 int i;
4984 struct diff_queue_struct *q = &diff_queued_diff;
4985
4986 if (WSEH_NEW & WS_RULE_MASK)
4987 die("BUG: WS rules bit mask overlaps with diff symbol flags");
4988
4989 for (i = 0; i < q->nr; i++) {
4990 struct diff_filepair *p = q->queue[i];
4991 if (check_pair_status(p))
4992 diff_flush_patch(p, o);
4993 }
4994}
4995
4996void diff_flush(struct diff_options *options)
4997{
4998 struct diff_queue_struct *q = &diff_queued_diff;
4999 int i, output_format = options->output_format;
5000 int separator = 0;
5001 int dirstat_by_line = 0;
5002
5003 /*
5004 * Order: raw, stat, summary, patch
5005 * or: name/name-status/checkdiff (other bits clear)
5006 */
5007 if (!q->nr)
5008 goto free_queue;
5009
5010 if (output_format & (DIFF_FORMAT_RAW |
5011 DIFF_FORMAT_NAME |
5012 DIFF_FORMAT_NAME_STATUS |
5013 DIFF_FORMAT_CHECKDIFF)) {
5014 for (i = 0; i < q->nr; i++) {
5015 struct diff_filepair *p = q->queue[i];
5016 if (check_pair_status(p))
5017 flush_one_pair(p, options);
5018 }
5019 separator++;
5020 }
5021
5022 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
5023 dirstat_by_line = 1;
5024
5025 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
5026 dirstat_by_line) {
5027 struct diffstat_t diffstat;
5028
5029 memset(&diffstat, 0, sizeof(struct diffstat_t));
5030 for (i = 0; i < q->nr; i++) {
5031 struct diff_filepair *p = q->queue[i];
5032 if (check_pair_status(p))
5033 diff_flush_stat(p, options, &diffstat);
5034 }
5035 if (output_format & DIFF_FORMAT_NUMSTAT)
5036 show_numstat(&diffstat, options);
5037 if (output_format & DIFF_FORMAT_DIFFSTAT)
5038 show_stats(&diffstat, options);
5039 if (output_format & DIFF_FORMAT_SHORTSTAT)
5040 show_shortstats(&diffstat, options);
5041 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
5042 show_dirstat_by_line(&diffstat, options);
5043 free_diffstat_info(&diffstat);
5044 separator++;
5045 }
5046 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
5047 show_dirstat(options);
5048
5049 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
5050 for (i = 0; i < q->nr; i++) {
5051 diff_summary(options, q->queue[i]);
5052 }
5053 separator++;
5054 }
5055
5056 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
5057 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
5058 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
5059 /*
5060 * run diff_flush_patch for the exit status. setting
5061 * options->file to /dev/null should be safe, because we
5062 * aren't supposed to produce any output anyway.
5063 */
5064 if (options->close_file)
5065 fclose(options->file);
5066 options->file = xfopen("/dev/null", "w");
5067 options->close_file = 1;
5068 for (i = 0; i < q->nr; i++) {
5069 struct diff_filepair *p = q->queue[i];
5070 if (check_pair_status(p))
5071 diff_flush_patch(p, options);
5072 if (options->found_changes)
5073 break;
5074 }
5075 }
5076
5077 if (output_format & DIFF_FORMAT_PATCH) {
5078 if (separator) {
5079 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
5080 if (options->stat_sep) {
5081 /* attach patch instead of inline */
5082 fputs(options->stat_sep, options->file);
5083 }
5084 }
5085
5086 diff_flush_patch_all_file_pairs(options);
5087 }
5088
5089 if (output_format & DIFF_FORMAT_CALLBACK)
5090 options->format_callback(q, options, options->format_callback_data);
5091
5092 for (i = 0; i < q->nr; i++)
5093 diff_free_filepair(q->queue[i]);
5094free_queue:
5095 free(q->queue);
5096 DIFF_QUEUE_CLEAR(q);
5097 if (options->close_file)
5098 fclose(options->file);
5099
5100 /*
5101 * Report the content-level differences with HAS_CHANGES;
5102 * diff_addremove/diff_change does not set the bit when
5103 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
5104 */
5105 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
5106 if (options->found_changes)
5107 DIFF_OPT_SET(options, HAS_CHANGES);
5108 else
5109 DIFF_OPT_CLR(options, HAS_CHANGES);
5110 }
5111}
5112
5113static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
5114{
5115 return (((p->status == DIFF_STATUS_MODIFIED) &&
5116 ((p->score &&
5117 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
5118 (!p->score &&
5119 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
5120 ((p->status != DIFF_STATUS_MODIFIED) &&
5121 filter_bit_tst(p->status, options)));
5122}
5123
5124static void diffcore_apply_filter(struct diff_options *options)
5125{
5126 int i;
5127 struct diff_queue_struct *q = &diff_queued_diff;
5128 struct diff_queue_struct outq;
5129
5130 DIFF_QUEUE_CLEAR(&outq);
5131
5132 if (!options->filter)
5133 return;
5134
5135 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
5136 int found;
5137 for (i = found = 0; !found && i < q->nr; i++) {
5138 if (match_filter(options, q->queue[i]))
5139 found++;
5140 }
5141 if (found)
5142 return;
5143
5144 /* otherwise we will clear the whole queue
5145 * by copying the empty outq at the end of this
5146 * function, but first clear the current entries
5147 * in the queue.
5148 */
5149 for (i = 0; i < q->nr; i++)
5150 diff_free_filepair(q->queue[i]);
5151 }
5152 else {
5153 /* Only the matching ones */
5154 for (i = 0; i < q->nr; i++) {
5155 struct diff_filepair *p = q->queue[i];
5156 if (match_filter(options, p))
5157 diff_q(&outq, p);
5158 else
5159 diff_free_filepair(p);
5160 }
5161 }
5162 free(q->queue);
5163 *q = outq;
5164}
5165
5166/* Check whether two filespecs with the same mode and size are identical */
5167static int diff_filespec_is_identical(struct diff_filespec *one,
5168 struct diff_filespec *two)
5169{
5170 if (S_ISGITLINK(one->mode))
5171 return 0;
5172 if (diff_populate_filespec(one, 0))
5173 return 0;
5174 if (diff_populate_filespec(two, 0))
5175 return 0;
5176 return !memcmp(one->data, two->data, one->size);
5177}
5178
5179static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
5180{
5181 if (p->done_skip_stat_unmatch)
5182 return p->skip_stat_unmatch_result;
5183
5184 p->done_skip_stat_unmatch = 1;
5185 p->skip_stat_unmatch_result = 0;
5186 /*
5187 * 1. Entries that come from stat info dirtiness
5188 * always have both sides (iow, not create/delete),
5189 * one side of the object name is unknown, with
5190 * the same mode and size. Keep the ones that
5191 * do not match these criteria. They have real
5192 * differences.
5193 *
5194 * 2. At this point, the file is known to be modified,
5195 * with the same mode and size, and the object
5196 * name of one side is unknown. Need to inspect
5197 * the identical contents.
5198 */
5199 if (!DIFF_FILE_VALID(p->one) || /* (1) */
5200 !DIFF_FILE_VALID(p->two) ||
5201 (p->one->oid_valid && p->two->oid_valid) ||
5202 (p->one->mode != p->two->mode) ||
5203 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
5204 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
5205 (p->one->size != p->two->size) ||
5206 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
5207 p->skip_stat_unmatch_result = 1;
5208 return p->skip_stat_unmatch_result;
5209}
5210
5211static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
5212{
5213 int i;
5214 struct diff_queue_struct *q = &diff_queued_diff;
5215 struct diff_queue_struct outq;
5216 DIFF_QUEUE_CLEAR(&outq);
5217
5218 for (i = 0; i < q->nr; i++) {
5219 struct diff_filepair *p = q->queue[i];
5220
5221 if (diff_filespec_check_stat_unmatch(p))
5222 diff_q(&outq, p);
5223 else {
5224 /*
5225 * The caller can subtract 1 from skip_stat_unmatch
5226 * to determine how many paths were dirty only
5227 * due to stat info mismatch.
5228 */
5229 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
5230 diffopt->skip_stat_unmatch++;
5231 diff_free_filepair(p);
5232 }
5233 }
5234 free(q->queue);
5235 *q = outq;
5236}
5237
5238static int diffnamecmp(const void *a_, const void *b_)
5239{
5240 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
5241 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
5242 const char *name_a, *name_b;
5243
5244 name_a = a->one ? a->one->path : a->two->path;
5245 name_b = b->one ? b->one->path : b->two->path;
5246 return strcmp(name_a, name_b);
5247}
5248
5249void diffcore_fix_diff_index(struct diff_options *options)
5250{
5251 struct diff_queue_struct *q = &diff_queued_diff;
5252 QSORT(q->queue, q->nr, diffnamecmp);
5253}
5254
5255void diffcore_std(struct diff_options *options)
5256{
5257 /* NOTE please keep the following in sync with diff_tree_combined() */
5258 if (options->skip_stat_unmatch)
5259 diffcore_skip_stat_unmatch(options);
5260 if (!options->found_follow) {
5261 /* See try_to_follow_renames() in tree-diff.c */
5262 if (options->break_opt != -1)
5263 diffcore_break(options->break_opt);
5264 if (options->detect_rename)
5265 diffcore_rename(options);
5266 if (options->break_opt != -1)
5267 diffcore_merge_broken();
5268 }
5269 if (options->pickaxe)
5270 diffcore_pickaxe(options);
5271 if (options->orderfile)
5272 diffcore_order(options->orderfile);
5273 if (!options->found_follow)
5274 /* See try_to_follow_renames() in tree-diff.c */
5275 diff_resolve_rename_copy();
5276 diffcore_apply_filter(options);
5277
5278 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5279 DIFF_OPT_SET(options, HAS_CHANGES);
5280 else
5281 DIFF_OPT_CLR(options, HAS_CHANGES);
5282
5283 options->found_follow = 0;
5284}
5285
5286int diff_result_code(struct diff_options *opt, int status)
5287{
5288 int result = 0;
5289
5290 diff_warn_rename_limit("diff.renameLimit",
5291 opt->needed_rename_limit,
5292 opt->degraded_cc_to_c);
5293 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5294 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
5295 return status;
5296 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5297 DIFF_OPT_TST(opt, HAS_CHANGES))
5298 result |= 01;
5299 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
5300 DIFF_OPT_TST(opt, CHECK_FAILED))
5301 result |= 02;
5302 return result;
5303}
5304
5305int diff_can_quit_early(struct diff_options *opt)
5306{
5307 return (DIFF_OPT_TST(opt, QUICK) &&
5308 !opt->filter &&
5309 DIFF_OPT_TST(opt, HAS_CHANGES));
5310}
5311
5312/*
5313 * Shall changes to this submodule be ignored?
5314 *
5315 * Submodule changes can be configured to be ignored separately for each path,
5316 * but that configuration can be overridden from the command line.
5317 */
5318static int is_submodule_ignored(const char *path, struct diff_options *options)
5319{
5320 int ignored = 0;
5321 unsigned orig_flags = options->flags;
5322 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
5323 set_diffopt_flags_from_submodule_config(options, path);
5324 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
5325 ignored = 1;
5326 options->flags = orig_flags;
5327 return ignored;
5328}
5329
5330void diff_addremove(struct diff_options *options,
5331 int addremove, unsigned mode,
5332 const struct object_id *oid,
5333 int oid_valid,
5334 const char *concatpath, unsigned dirty_submodule)
5335{
5336 struct diff_filespec *one, *two;
5337
5338 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
5339 return;
5340
5341 /* This may look odd, but it is a preparation for
5342 * feeding "there are unchanged files which should
5343 * not produce diffs, but when you are doing copy
5344 * detection you would need them, so here they are"
5345 * entries to the diff-core. They will be prefixed
5346 * with something like '=' or '*' (I haven't decided
5347 * which but should not make any difference).
5348 * Feeding the same new and old to diff_change()
5349 * also has the same effect.
5350 * Before the final output happens, they are pruned after
5351 * merged into rename/copy pairs as appropriate.
5352 */
5353 if (DIFF_OPT_TST(options, REVERSE_DIFF))
5354 addremove = (addremove == '+' ? '-' :
5355 addremove == '-' ? '+' : addremove);
5356
5357 if (options->prefix &&
5358 strncmp(concatpath, options->prefix, options->prefix_length))
5359 return;
5360
5361 one = alloc_filespec(concatpath);
5362 two = alloc_filespec(concatpath);
5363
5364 if (addremove != '+')
5365 fill_filespec(one, oid, oid_valid, mode);
5366 if (addremove != '-') {
5367 fill_filespec(two, oid, oid_valid, mode);
5368 two->dirty_submodule = dirty_submodule;
5369 }
5370
5371 diff_queue(&diff_queued_diff, one, two);
5372 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5373 DIFF_OPT_SET(options, HAS_CHANGES);
5374}
5375
5376void diff_change(struct diff_options *options,
5377 unsigned old_mode, unsigned new_mode,
5378 const struct object_id *old_oid,
5379 const struct object_id *new_oid,
5380 int old_oid_valid, int new_oid_valid,
5381 const char *concatpath,
5382 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
5383{
5384 struct diff_filespec *one, *two;
5385 struct diff_filepair *p;
5386
5387 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
5388 is_submodule_ignored(concatpath, options))
5389 return;
5390
5391 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
5392 SWAP(old_mode, new_mode);
5393 SWAP(old_oid, new_oid);
5394 SWAP(old_oid_valid, new_oid_valid);
5395 SWAP(old_dirty_submodule, new_dirty_submodule);
5396 }
5397
5398 if (options->prefix &&
5399 strncmp(concatpath, options->prefix, options->prefix_length))
5400 return;
5401
5402 one = alloc_filespec(concatpath);
5403 two = alloc_filespec(concatpath);
5404 fill_filespec(one, old_oid, old_oid_valid, old_mode);
5405 fill_filespec(two, new_oid, new_oid_valid, new_mode);
5406 one->dirty_submodule = old_dirty_submodule;
5407 two->dirty_submodule = new_dirty_submodule;
5408 p = diff_queue(&diff_queued_diff, one, two);
5409
5410 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5411 return;
5412
5413 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5414 !diff_filespec_check_stat_unmatch(p))
5415 return;
5416
5417 DIFF_OPT_SET(options, HAS_CHANGES);
5418}
5419
5420struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5421{
5422 struct diff_filepair *pair;
5423 struct diff_filespec *one, *two;
5424
5425 if (options->prefix &&
5426 strncmp(path, options->prefix, options->prefix_length))
5427 return NULL;
5428
5429 one = alloc_filespec(path);
5430 two = alloc_filespec(path);
5431 pair = diff_queue(&diff_queued_diff, one, two);
5432 pair->is_unmerged = 1;
5433 return pair;
5434}
5435
5436static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5437 size_t *outsize)
5438{
5439 struct diff_tempfile *temp;
5440 const char *argv[3];
5441 const char **arg = argv;
5442 struct child_process child = CHILD_PROCESS_INIT;
5443 struct strbuf buf = STRBUF_INIT;
5444 int err = 0;
5445
5446 temp = prepare_temp_file(spec->path, spec);
5447 *arg++ = pgm;
5448 *arg++ = temp->name;
5449 *arg = NULL;
5450
5451 child.use_shell = 1;
5452 child.argv = argv;
5453 child.out = -1;
5454 if (start_command(&child)) {
5455 remove_tempfile();
5456 return NULL;
5457 }
5458
5459 if (strbuf_read(&buf, child.out, 0) < 0)
5460 err = error("error reading from textconv command '%s'", pgm);
5461 close(child.out);
5462
5463 if (finish_command(&child) || err) {
5464 strbuf_release(&buf);
5465 remove_tempfile();
5466 return NULL;
5467 }
5468 remove_tempfile();
5469
5470 return strbuf_detach(&buf, outsize);
5471}
5472
5473size_t fill_textconv(struct userdiff_driver *driver,
5474 struct diff_filespec *df,
5475 char **outbuf)
5476{
5477 size_t size;
5478
5479 if (!driver) {
5480 if (!DIFF_FILE_VALID(df)) {
5481 *outbuf = "";
5482 return 0;
5483 }
5484 if (diff_populate_filespec(df, 0))
5485 die("unable to read files to diff");
5486 *outbuf = df->data;
5487 return df->size;
5488 }
5489
5490 if (!driver->textconv)
5491 die("BUG: fill_textconv called with non-textconv driver");
5492
5493 if (driver->textconv_cache && df->oid_valid) {
5494 *outbuf = notes_cache_get(driver->textconv_cache,
5495 &df->oid,
5496 &size);
5497 if (*outbuf)
5498 return size;
5499 }
5500
5501 *outbuf = run_textconv(driver->textconv, df, &size);
5502 if (!*outbuf)
5503 die("unable to read files to diff");
5504
5505 if (driver->textconv_cache && df->oid_valid) {
5506 /* ignore errors, as we might be in a readonly repository */
5507 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
5508 size);
5509 /*
5510 * we could save up changes and flush them all at the end,
5511 * but we would need an extra call after all diffing is done.
5512 * Since generating a cache entry is the slow path anyway,
5513 * this extra overhead probably isn't a big deal.
5514 */
5515 notes_cache_write(driver->textconv_cache);
5516 }
5517
5518 return size;
5519}
5520
5521int textconv_object(const char *path,
5522 unsigned mode,
5523 const struct object_id *oid,
5524 int oid_valid,
5525 char **buf,
5526 unsigned long *buf_size)
5527{
5528 struct diff_filespec *df;
5529 struct userdiff_driver *textconv;
5530
5531 df = alloc_filespec(path);
5532 fill_filespec(df, oid, oid_valid, mode);
5533 textconv = get_textconv(df);
5534 if (!textconv) {
5535 free_filespec(df);
5536 return 0;
5537 }
5538
5539 *buf_size = fill_textconv(textconv, df, buf);
5540 free_filespec(df);
5541 return 1;
5542}
5543
5544void setup_diff_pager(struct diff_options *opt)
5545{
5546 /*
5547 * If the user asked for our exit code, then either they want --quiet
5548 * or --exit-code. We should definitely not bother with a pager in the
5549 * former case, as we will generate no output. Since we still properly
5550 * report our exit code even when a pager is run, we _could_ run a
5551 * pager with --exit-code. But since we have not done so historically,
5552 * and because it is easy to find people oneline advising "git diff
5553 * --exit-code" in hooks and other scripts, we do not do so.
5554 */
5555 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5556 check_pager_config("diff") != 0)
5557 setup_pager();
5558}
Unnamed repository; edit this file 'description' to name the repository.