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Doc/gitsubmodules: make some changes to improve readability and syntax
[git/debian.git] / grep.c
blob3d7cd0e96f1ee160a66dd500c58d4026bf24e34c
1 #include "cache.h"
2 #include "config.h"
3 #include "grep.h"
4 #include "userdiff.h"
5 #include "xdiff-interface.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "commit.h"
9 #include "quote.h"
10
11 static int grep_source_load(struct grep_source *gs);
12 static int grep_source_is_binary(struct grep_source *gs);
13
14 static struct grep_opt grep_defaults;
15
16 static void std_output(struct grep_opt *opt, const void *buf, size_t size)
17 {
18 fwrite(buf, size, 1, stdout);
19 }
20
21 /*
22 * Initialize the grep_defaults template with hardcoded defaults.
23 * We could let the compiler do this, but without C99 initializers
24 * the code gets unwieldy and unreadable, so...
25 */
26 void init_grep_defaults(void)
27 {
28 struct grep_opt *opt = &grep_defaults;
29 static int run_once;
30
31 if (run_once)
32 return;
33 run_once++;
34
35 memset(opt, 0, sizeof(*opt));
36 opt->relative = 1;
37 opt->pathname = 1;
38 opt->max_depth = -1;
39 opt->pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
40 color_set(opt->color_context, "");
41 color_set(opt->color_filename, "");
42 color_set(opt->color_function, "");
43 color_set(opt->color_lineno, "");
44 color_set(opt->color_match_context, GIT_COLOR_BOLD_RED);
45 color_set(opt->color_match_selected, GIT_COLOR_BOLD_RED);
46 color_set(opt->color_selected, "");
47 color_set(opt->color_sep, GIT_COLOR_CYAN);
48 opt->color = -1;
49 opt->output = std_output;
50 }
51
52 static int parse_pattern_type_arg(const char *opt, const char *arg)
53 {
54 if (!strcmp(arg, "default"))
55 return GREP_PATTERN_TYPE_UNSPECIFIED;
56 else if (!strcmp(arg, "basic"))
57 return GREP_PATTERN_TYPE_BRE;
58 else if (!strcmp(arg, "extended"))
59 return GREP_PATTERN_TYPE_ERE;
60 else if (!strcmp(arg, "fixed"))
61 return GREP_PATTERN_TYPE_FIXED;
62 else if (!strcmp(arg, "perl"))
63 return GREP_PATTERN_TYPE_PCRE;
64 die("bad %s argument: %s", opt, arg);
65 }
66
67 /*
68 * Read the configuration file once and store it in
69 * the grep_defaults template.
70 */
71 int grep_config(const char *var, const char *value, void *cb)
72 {
73 struct grep_opt *opt = &grep_defaults;
74 char *color = NULL;
75
76 if (userdiff_config(var, value) < 0)
77 return -1;
78
79 if (!strcmp(var, "grep.extendedregexp")) {
80 opt->extended_regexp_option = git_config_bool(var, value);
81 return 0;
82 }
83
84 if (!strcmp(var, "grep.patterntype")) {
85 opt->pattern_type_option = parse_pattern_type_arg(var, value);
86 return 0;
87 }
88
89 if (!strcmp(var, "grep.linenumber")) {
90 opt->linenum = git_config_bool(var, value);
91 return 0;
92 }
93
94 if (!strcmp(var, "grep.fullname")) {
95 opt->relative = !git_config_bool(var, value);
96 return 0;
97 }
98
99 if (!strcmp(var, "color.grep"))
100 opt->color = git_config_colorbool(var, value);
101 else if (!strcmp(var, "color.grep.context"))
102 color = opt->color_context;
103 else if (!strcmp(var, "color.grep.filename"))
104 color = opt->color_filename;
105 else if (!strcmp(var, "color.grep.function"))
106 color = opt->color_function;
107 else if (!strcmp(var, "color.grep.linenumber"))
108 color = opt->color_lineno;
109 else if (!strcmp(var, "color.grep.matchcontext"))
110 color = opt->color_match_context;
111 else if (!strcmp(var, "color.grep.matchselected"))
112 color = opt->color_match_selected;
113 else if (!strcmp(var, "color.grep.selected"))
114 color = opt->color_selected;
115 else if (!strcmp(var, "color.grep.separator"))
116 color = opt->color_sep;
117 else if (!strcmp(var, "color.grep.match")) {
118 int rc = 0;
119 if (!value)
120 return config_error_nonbool(var);
121 rc |= color_parse(value, opt->color_match_context);
122 rc |= color_parse(value, opt->color_match_selected);
123 return rc;
124 }
125
126 if (color) {
127 if (!value)
128 return config_error_nonbool(var);
129 return color_parse(value, color);
130 }
131 return 0;
132 }
133
134 /*
135 * Initialize one instance of grep_opt and copy the
136 * default values from the template we read the configuration
137 * information in an earlier call to git_config(grep_config).
138 */
139 void grep_init(struct grep_opt *opt, const char *prefix)
140 {
141 struct grep_opt *def = &grep_defaults;
142
143 memset(opt, 0, sizeof(*opt));
144 opt->prefix = prefix;
145 opt->prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
146 opt->pattern_tail = &opt->pattern_list;
147 opt->header_tail = &opt->header_list;
148
149 opt->color = def->color;
150 opt->extended_regexp_option = def->extended_regexp_option;
151 opt->pattern_type_option = def->pattern_type_option;
152 opt->linenum = def->linenum;
153 opt->max_depth = def->max_depth;
154 opt->pathname = def->pathname;
155 opt->relative = def->relative;
156 opt->output = def->output;
157
158 color_set(opt->color_context, def->color_context);
159 color_set(opt->color_filename, def->color_filename);
160 color_set(opt->color_function, def->color_function);
161 color_set(opt->color_lineno, def->color_lineno);
162 color_set(opt->color_match_context, def->color_match_context);
163 color_set(opt->color_match_selected, def->color_match_selected);
164 color_set(opt->color_selected, def->color_selected);
165 color_set(opt->color_sep, def->color_sep);
166 }
167
168 static void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, struct grep_opt *opt)
169 {
170 /*
171 * When committing to the pattern type by setting the relevant
172 * fields in grep_opt it's generally not necessary to zero out
173 * the fields we're not choosing, since they won't have been
174 * set by anything. The extended_regexp_option field is the
175 * only exception to this.
176 *
177 * This is because in the process of parsing grep.patternType
178 * & grep.extendedRegexp we set opt->pattern_type_option and
179 * opt->extended_regexp_option, respectively. We then
180 * internally use opt->extended_regexp_option to see if we're
181 * compiling an ERE. It must be unset if that's not actually
182 * the case.
183 */
184 if (pattern_type != GREP_PATTERN_TYPE_ERE &&
185 opt->extended_regexp_option)
186 opt->extended_regexp_option = 0;
187
188 switch (pattern_type) {
189 case GREP_PATTERN_TYPE_UNSPECIFIED:
190 /* fall through */
191
192 case GREP_PATTERN_TYPE_BRE:
193 break;
194
195 case GREP_PATTERN_TYPE_ERE:
196 opt->extended_regexp_option = 1;
197 break;
198
199 case GREP_PATTERN_TYPE_FIXED:
200 opt->fixed = 1;
201 break;
202
203 case GREP_PATTERN_TYPE_PCRE:
204 #ifdef USE_LIBPCRE2
205 opt->pcre2 = 1;
206 #else
207 /*
208 * It's important that pcre1 always be assigned to
209 * even when there's no USE_LIBPCRE* defined. We still
210 * call the PCRE stub function, it just dies with
211 * "cannot use Perl-compatible regexes[...]".
212 */
213 opt->pcre1 = 1;
214 #endif
215 break;
216 }
217 }
218
219 void grep_commit_pattern_type(enum grep_pattern_type pattern_type, struct grep_opt *opt)
220 {
221 if (pattern_type != GREP_PATTERN_TYPE_UNSPECIFIED)
222 grep_set_pattern_type_option(pattern_type, opt);
223 else if (opt->pattern_type_option != GREP_PATTERN_TYPE_UNSPECIFIED)
224 grep_set_pattern_type_option(opt->pattern_type_option, opt);
225 else if (opt->extended_regexp_option)
226 /*
227 * This branch *must* happen after setting from the
228 * opt->pattern_type_option above, we don't want
229 * grep.extendedRegexp to override grep.patternType!
230 */
231 grep_set_pattern_type_option(GREP_PATTERN_TYPE_ERE, opt);
232 }
233
234 static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
235 const char *origin, int no,
236 enum grep_pat_token t,
237 enum grep_header_field field)
238 {
239 struct grep_pat *p = xcalloc(1, sizeof(*p));
240 p->pattern = xmemdupz(pat, patlen);
241 p->patternlen = patlen;
242 p->origin = origin;
243 p->no = no;
244 p->token = t;
245 p->field = field;
246 return p;
247 }
248
249 static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
250 {
251 **tail = p;
252 *tail = &p->next;
253 p->next = NULL;
254
255 switch (p->token) {
256 case GREP_PATTERN: /* atom */
257 case GREP_PATTERN_HEAD:
258 case GREP_PATTERN_BODY:
259 for (;;) {
260 struct grep_pat *new_pat;
261 size_t len = 0;
262 char *cp = p->pattern + p->patternlen, *nl = NULL;
263 while (++len <= p->patternlen) {
264 if (*(--cp) == '\n') {
265 nl = cp;
266 break;
267 }
268 }
269 if (!nl)
270 break;
271 new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
272 p->no, p->token, p->field);
273 new_pat->next = p->next;
274 if (!p->next)
275 *tail = &new_pat->next;
276 p->next = new_pat;
277 *nl = '\0';
278 p->patternlen -= len;
279 }
280 break;
281 default:
282 break;
283 }
284 }
285
286 void append_header_grep_pattern(struct grep_opt *opt,
287 enum grep_header_field field, const char *pat)
288 {
289 struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
290 GREP_PATTERN_HEAD, field);
291 if (field == GREP_HEADER_REFLOG)
292 opt->use_reflog_filter = 1;
293 do_append_grep_pat(&opt->header_tail, p);
294 }
295
296 void append_grep_pattern(struct grep_opt *opt, const char *pat,
297 const char *origin, int no, enum grep_pat_token t)
298 {
299 append_grep_pat(opt, pat, strlen(pat), origin, no, t);
300 }
301
302 void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
303 const char *origin, int no, enum grep_pat_token t)
304 {
305 struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
306 do_append_grep_pat(&opt->pattern_tail, p);
307 }
308
309 struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
310 {
311 struct grep_pat *pat;
312 struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
313 *ret = *opt;
314
315 ret->pattern_list = NULL;
316 ret->pattern_tail = &ret->pattern_list;
317
318 for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
319 {
320 if(pat->token == GREP_PATTERN_HEAD)
321 append_header_grep_pattern(ret, pat->field,
322 pat->pattern);
323 else
324 append_grep_pat(ret, pat->pattern, pat->patternlen,
325 pat->origin, pat->no, pat->token);
326 }
327
328 return ret;
329 }
330
331 static NORETURN void compile_regexp_failed(const struct grep_pat *p,
332 const char *error)
333 {
334 char where[1024];
335
336 if (p->no)
337 xsnprintf(where, sizeof(where), "In '%s' at %d, ", p->origin, p->no);
338 else if (p->origin)
339 xsnprintf(where, sizeof(where), "%s, ", p->origin);
340 else
341 where[0] = 0;
342
343 die("%s'%s': %s", where, p->pattern, error);
344 }
345
346 static int is_fixed(const char *s, size_t len)
347 {
348 size_t i;
349
350 for (i = 0; i < len; i++) {
351 if (is_regex_special(s[i]))
352 return 0;
353 }
354
355 return 1;
356 }
357
358 static int has_null(const char *s, size_t len)
359 {
360 /*
361 * regcomp cannot accept patterns with NULs so when using it
362 * we consider any pattern containing a NUL fixed.
363 */
364 if (memchr(s, 0, len))
365 return 1;
366
367 return 0;
368 }
369
370 #ifdef USE_LIBPCRE1
371 static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
372 {
373 const char *error;
374 int erroffset;
375 int options = PCRE_MULTILINE;
376
377 if (opt->ignore_case) {
378 if (has_non_ascii(p->pattern))
379 p->pcre1_tables = pcre_maketables();
380 options |= PCRE_CASELESS;
381 }
382 if (is_utf8_locale() && has_non_ascii(p->pattern))
383 options |= PCRE_UTF8;
384
385 p->pcre1_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
386 p->pcre1_tables);
387 if (!p->pcre1_regexp)
388 compile_regexp_failed(p, error);
389
390 p->pcre1_extra_info = pcre_study(p->pcre1_regexp, GIT_PCRE_STUDY_JIT_COMPILE, &error);
391 if (!p->pcre1_extra_info && error)
392 die("%s", error);
393
394 #ifdef GIT_PCRE1_USE_JIT
395 pcre_config(PCRE_CONFIG_JIT, &p->pcre1_jit_on);
396 if (p->pcre1_jit_on == 1) {
397 p->pcre1_jit_stack = pcre_jit_stack_alloc(1, 1024 * 1024);
398 if (!p->pcre1_jit_stack)
399 die("Couldn't allocate PCRE JIT stack");
400 pcre_assign_jit_stack(p->pcre1_extra_info, NULL, p->pcre1_jit_stack);
401 } else if (p->pcre1_jit_on != 0) {
402 die("BUG: The pcre1_jit_on variable should be 0 or 1, not %d",
403 p->pcre1_jit_on);
404 }
405 #endif
406 }
407
408 static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
409 regmatch_t *match, int eflags)
410 {
411 int ovector[30], ret, flags = 0;
412
413 if (eflags & REG_NOTBOL)
414 flags |= PCRE_NOTBOL;
415
416 #ifdef GIT_PCRE1_USE_JIT
417 if (p->pcre1_jit_on) {
418 ret = pcre_jit_exec(p->pcre1_regexp, p->pcre1_extra_info, line,
419 eol - line, 0, flags, ovector,
420 ARRAY_SIZE(ovector), p->pcre1_jit_stack);
421 } else
422 #endif
423 {
424 ret = pcre_exec(p->pcre1_regexp, p->pcre1_extra_info, line,
425 eol - line, 0, flags, ovector,
426 ARRAY_SIZE(ovector));
427 }
428
429 if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
430 die("pcre_exec failed with error code %d", ret);
431 if (ret > 0) {
432 ret = 0;
433 match->rm_so = ovector[0];
434 match->rm_eo = ovector[1];
435 }
436
437 return ret;
438 }
439
440 static void free_pcre1_regexp(struct grep_pat *p)
441 {
442 pcre_free(p->pcre1_regexp);
443 #ifdef GIT_PCRE1_USE_JIT
444 if (p->pcre1_jit_on) {
445 pcre_free_study(p->pcre1_extra_info);
446 pcre_jit_stack_free(p->pcre1_jit_stack);
447 } else
448 #endif
449 {
450 pcre_free(p->pcre1_extra_info);
451 }
452 pcre_free((void *)p->pcre1_tables);
453 }
454 #else /* !USE_LIBPCRE1 */
455 static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
456 {
457 die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
458 }
459
460 static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
461 regmatch_t *match, int eflags)
462 {
463 return 1;
464 }
465
466 static void free_pcre1_regexp(struct grep_pat *p)
467 {
468 }
469 #endif /* !USE_LIBPCRE1 */
470
471 #ifdef USE_LIBPCRE2
472 static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
473 {
474 int error;
475 PCRE2_UCHAR errbuf[256];
476 PCRE2_SIZE erroffset;
477 int options = PCRE2_MULTILINE;
478 const uint8_t *character_tables = NULL;
479 int jitret;
480 int patinforet;
481 size_t jitsizearg;
482
483 assert(opt->pcre2);
484
485 p->pcre2_compile_context = NULL;
486
487 if (opt->ignore_case) {
488 if (has_non_ascii(p->pattern)) {
489 character_tables = pcre2_maketables(NULL);
490 p->pcre2_compile_context = pcre2_compile_context_create(NULL);
491 pcre2_set_character_tables(p->pcre2_compile_context, character_tables);
492 }
493 options |= PCRE2_CASELESS;
494 }
495 if (is_utf8_locale() && has_non_ascii(p->pattern))
496 options |= PCRE2_UTF;
497
498 p->pcre2_pattern = pcre2_compile((PCRE2_SPTR)p->pattern,
499 p->patternlen, options, &error, &erroffset,
500 p->pcre2_compile_context);
501
502 if (p->pcre2_pattern) {
503 p->pcre2_match_data = pcre2_match_data_create_from_pattern(p->pcre2_pattern, NULL);
504 if (!p->pcre2_match_data)
505 die("Couldn't allocate PCRE2 match data");
506 } else {
507 pcre2_get_error_message(error, errbuf, sizeof(errbuf));
508 compile_regexp_failed(p, (const char *)&errbuf);
509 }
510
511 pcre2_config(PCRE2_CONFIG_JIT, &p->pcre2_jit_on);
512 if (p->pcre2_jit_on == 1) {
513 jitret = pcre2_jit_compile(p->pcre2_pattern, PCRE2_JIT_COMPLETE);
514 if (jitret)
515 die("Couldn't JIT the PCRE2 pattern '%s', got '%d'\n", p->pattern, jitret);
516
517 /*
518 * The pcre2_config(PCRE2_CONFIG_JIT, ...) call just
519 * tells us whether the library itself supports JIT,
520 * but to see whether we're going to be actually using
521 * JIT we need to extract PCRE2_INFO_JITSIZE from the
522 * pattern *after* we do pcre2_jit_compile() above.
523 *
524 * This is because if the pattern contains the
525 * (*NO_JIT) verb (see pcre2syntax(3))
526 * pcre2_jit_compile() will exit early with 0. If we
527 * then proceed to call pcre2_jit_match() further down
528 * the line instead of pcre2_match() we'll either
529 * segfault (pre PCRE 10.31) or run into a fatal error
530 * (post PCRE2 10.31)
531 */
532 patinforet = pcre2_pattern_info(p->pcre2_pattern, PCRE2_INFO_JITSIZE, &jitsizearg);
533 if (patinforet)
534 BUG("pcre2_pattern_info() failed: %d", patinforet);
535 if (jitsizearg == 0) {
536 p->pcre2_jit_on = 0;
537 return;
538 }
539
540 p->pcre2_jit_stack = pcre2_jit_stack_create(1, 1024 * 1024, NULL);
541 if (!p->pcre2_jit_stack)
542 die("Couldn't allocate PCRE2 JIT stack");
543 p->pcre2_match_context = pcre2_match_context_create(NULL);
544 if (!p->pcre2_match_context)
545 die("Couldn't allocate PCRE2 match context");
546 pcre2_jit_stack_assign(p->pcre2_match_context, NULL, p->pcre2_jit_stack);
547 } else if (p->pcre2_jit_on != 0) {
548 die("BUG: The pcre2_jit_on variable should be 0 or 1, not %d",
549 p->pcre1_jit_on);
550 }
551 }
552
553 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
554 regmatch_t *match, int eflags)
555 {
556 int ret, flags = 0;
557 PCRE2_SIZE *ovector;
558 PCRE2_UCHAR errbuf[256];
559
560 if (eflags & REG_NOTBOL)
561 flags |= PCRE2_NOTBOL;
562
563 if (p->pcre2_jit_on)
564 ret = pcre2_jit_match(p->pcre2_pattern, (unsigned char *)line,
565 eol - line, 0, flags, p->pcre2_match_data,
566 NULL);
567 else
568 ret = pcre2_match(p->pcre2_pattern, (unsigned char *)line,
569 eol - line, 0, flags, p->pcre2_match_data,
570 NULL);
571
572 if (ret < 0 && ret != PCRE2_ERROR_NOMATCH) {
573 pcre2_get_error_message(ret, errbuf, sizeof(errbuf));
574 die("%s failed with error code %d: %s",
575 (p->pcre2_jit_on ? "pcre2_jit_match" : "pcre2_match"), ret,
576 errbuf);
577 }
578 if (ret > 0) {
579 ovector = pcre2_get_ovector_pointer(p->pcre2_match_data);
580 ret = 0;
581 match->rm_so = (int)ovector[0];
582 match->rm_eo = (int)ovector[1];
583 }
584
585 return ret;
586 }
587
588 static void free_pcre2_pattern(struct grep_pat *p)
589 {
590 pcre2_compile_context_free(p->pcre2_compile_context);
591 pcre2_code_free(p->pcre2_pattern);
592 pcre2_match_data_free(p->pcre2_match_data);
593 pcre2_jit_stack_free(p->pcre2_jit_stack);
594 pcre2_match_context_free(p->pcre2_match_context);
595 }
596 #else /* !USE_LIBPCRE2 */
597 static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
598 {
599 /*
600 * Unreachable until USE_LIBPCRE2 becomes synonymous with
601 * USE_LIBPCRE. See the sibling comment in
602 * grep_set_pattern_type_option().
603 */
604 die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
605 }
606
607 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
608 regmatch_t *match, int eflags)
609 {
610 return 1;
611 }
612
613 static void free_pcre2_pattern(struct grep_pat *p)
614 {
615 }
616 #endif /* !USE_LIBPCRE2 */
617
618 static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
619 {
620 struct strbuf sb = STRBUF_INIT;
621 int err;
622 int regflags = 0;
623
624 basic_regex_quote_buf(&sb, p->pattern);
625 if (opt->ignore_case)
626 regflags |= REG_ICASE;
627 err = regcomp(&p->regexp, sb.buf, regflags);
628 if (opt->debug)
629 fprintf(stderr, "fixed %s\n", sb.buf);
630 strbuf_release(&sb);
631 if (err) {
632 char errbuf[1024];
633 regerror(err, &p->regexp, errbuf, sizeof(errbuf));
634 regfree(&p->regexp);
635 compile_regexp_failed(p, errbuf);
636 }
637 }
638
639 static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
640 {
641 int ascii_only;
642 int err;
643 int regflags = REG_NEWLINE;
644
645 p->word_regexp = opt->word_regexp;
646 p->ignore_case = opt->ignore_case;
647 ascii_only = !has_non_ascii(p->pattern);
648
649 /*
650 * Even when -F (fixed) asks us to do a non-regexp search, we
651 * may not be able to correctly case-fold when -i
652 * (ignore-case) is asked (in which case, we'll synthesize a
653 * regexp to match the pattern that matches regexp special
654 * characters literally, while ignoring case differences). On
655 * the other hand, even without -F, if the pattern does not
656 * have any regexp special characters and there is no need for
657 * case-folding search, we can internally turn it into a
658 * simple string match using kws. p->fixed tells us if we
659 * want to use kws.
660 */
661 if (opt->fixed ||
662 has_null(p->pattern, p->patternlen) ||
663 is_fixed(p->pattern, p->patternlen))
664 p->fixed = !p->ignore_case || ascii_only;
665
666 if (p->fixed) {
667 p->kws = kwsalloc(p->ignore_case ? tolower_trans_tbl : NULL);
668 kwsincr(p->kws, p->pattern, p->patternlen);
669 kwsprep(p->kws);
670 return;
671 } else if (opt->fixed) {
672 /*
673 * We come here when the pattern has the non-ascii
674 * characters we cannot case-fold, and asked to
675 * ignore-case.
676 */
677 compile_fixed_regexp(p, opt);
678 return;
679 }
680
681 if (opt->pcre2) {
682 compile_pcre2_pattern(p, opt);
683 return;
684 }
685
686 if (opt->pcre1) {
687 compile_pcre1_regexp(p, opt);
688 return;
689 }
690
691 if (p->ignore_case)
692 regflags |= REG_ICASE;
693 if (opt->extended_regexp_option)
694 regflags |= REG_EXTENDED;
695 err = regcomp(&p->regexp, p->pattern, regflags);
696 if (err) {
697 char errbuf[1024];
698 regerror(err, &p->regexp, errbuf, 1024);
699 regfree(&p->regexp);
700 compile_regexp_failed(p, errbuf);
701 }
702 }
703
704 static struct grep_expr *compile_pattern_or(struct grep_pat **);
705 static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
706 {
707 struct grep_pat *p;
708 struct grep_expr *x;
709
710 p = *list;
711 if (!p)
712 return NULL;
713 switch (p->token) {
714 case GREP_PATTERN: /* atom */
715 case GREP_PATTERN_HEAD:
716 case GREP_PATTERN_BODY:
717 x = xcalloc(1, sizeof (struct grep_expr));
718 x->node = GREP_NODE_ATOM;
719 x->u.atom = p;
720 *list = p->next;
721 return x;
722 case GREP_OPEN_PAREN:
723 *list = p->next;
724 x = compile_pattern_or(list);
725 if (!*list || (*list)->token != GREP_CLOSE_PAREN)
726 die("unmatched parenthesis");
727 *list = (*list)->next;
728 return x;
729 default:
730 return NULL;
731 }
732 }
733
734 static struct grep_expr *compile_pattern_not(struct grep_pat **list)
735 {
736 struct grep_pat *p;
737 struct grep_expr *x;
738
739 p = *list;
740 if (!p)
741 return NULL;
742 switch (p->token) {
743 case GREP_NOT:
744 if (!p->next)
745 die("--not not followed by pattern expression");
746 *list = p->next;
747 x = xcalloc(1, sizeof (struct grep_expr));
748 x->node = GREP_NODE_NOT;
749 x->u.unary = compile_pattern_not(list);
750 if (!x->u.unary)
751 die("--not followed by non pattern expression");
752 return x;
753 default:
754 return compile_pattern_atom(list);
755 }
756 }
757
758 static struct grep_expr *compile_pattern_and(struct grep_pat **list)
759 {
760 struct grep_pat *p;
761 struct grep_expr *x, *y, *z;
762
763 x = compile_pattern_not(list);
764 p = *list;
765 if (p && p->token == GREP_AND) {
766 if (!p->next)
767 die("--and not followed by pattern expression");
768 *list = p->next;
769 y = compile_pattern_and(list);
770 if (!y)
771 die("--and not followed by pattern expression");
772 z = xcalloc(1, sizeof (struct grep_expr));
773 z->node = GREP_NODE_AND;
774 z->u.binary.left = x;
775 z->u.binary.right = y;
776 return z;
777 }
778 return x;
779 }
780
781 static struct grep_expr *compile_pattern_or(struct grep_pat **list)
782 {
783 struct grep_pat *p;
784 struct grep_expr *x, *y, *z;
785
786 x = compile_pattern_and(list);
787 p = *list;
788 if (x && p && p->token != GREP_CLOSE_PAREN) {
789 y = compile_pattern_or(list);
790 if (!y)
791 die("not a pattern expression %s", p->pattern);
792 z = xcalloc(1, sizeof (struct grep_expr));
793 z->node = GREP_NODE_OR;
794 z->u.binary.left = x;
795 z->u.binary.right = y;
796 return z;
797 }
798 return x;
799 }
800
801 static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
802 {
803 return compile_pattern_or(list);
804 }
805
806 static void indent(int in)
807 {
808 while (in-- > 0)
809 fputc(' ', stderr);
810 }
811
812 static void dump_grep_pat(struct grep_pat *p)
813 {
814 switch (p->token) {
815 case GREP_AND: fprintf(stderr, "*and*"); break;
816 case GREP_OPEN_PAREN: fprintf(stderr, "*(*"); break;
817 case GREP_CLOSE_PAREN: fprintf(stderr, "*)*"); break;
818 case GREP_NOT: fprintf(stderr, "*not*"); break;
819 case GREP_OR: fprintf(stderr, "*or*"); break;
820
821 case GREP_PATTERN: fprintf(stderr, "pattern"); break;
822 case GREP_PATTERN_HEAD: fprintf(stderr, "pattern_head"); break;
823 case GREP_PATTERN_BODY: fprintf(stderr, "pattern_body"); break;
824 }
825
826 switch (p->token) {
827 default: break;
828 case GREP_PATTERN_HEAD:
829 fprintf(stderr, "<head %d>", p->field); break;
830 case GREP_PATTERN_BODY:
831 fprintf(stderr, "<body>"); break;
832 }
833 switch (p->token) {
834 default: break;
835 case GREP_PATTERN_HEAD:
836 case GREP_PATTERN_BODY:
837 case GREP_PATTERN:
838 fprintf(stderr, "%.*s", (int)p->patternlen, p->pattern);
839 break;
840 }
841 fputc('\n', stderr);
842 }
843
844 static void dump_grep_expression_1(struct grep_expr *x, int in)
845 {
846 indent(in);
847 switch (x->node) {
848 case GREP_NODE_TRUE:
849 fprintf(stderr, "true\n");
850 break;
851 case GREP_NODE_ATOM:
852 dump_grep_pat(x->u.atom);
853 break;
854 case GREP_NODE_NOT:
855 fprintf(stderr, "(not\n");
856 dump_grep_expression_1(x->u.unary, in+1);
857 indent(in);
858 fprintf(stderr, ")\n");
859 break;
860 case GREP_NODE_AND:
861 fprintf(stderr, "(and\n");
862 dump_grep_expression_1(x->u.binary.left, in+1);
863 dump_grep_expression_1(x->u.binary.right, in+1);
864 indent(in);
865 fprintf(stderr, ")\n");
866 break;
867 case GREP_NODE_OR:
868 fprintf(stderr, "(or\n");
869 dump_grep_expression_1(x->u.binary.left, in+1);
870 dump_grep_expression_1(x->u.binary.right, in+1);
871 indent(in);
872 fprintf(stderr, ")\n");
873 break;
874 }
875 }
876
877 static void dump_grep_expression(struct grep_opt *opt)
878 {
879 struct grep_expr *x = opt->pattern_expression;
880
881 if (opt->all_match)
882 fprintf(stderr, "[all-match]\n");
883 dump_grep_expression_1(x, 0);
884 fflush(NULL);
885 }
886
887 static struct grep_expr *grep_true_expr(void)
888 {
889 struct grep_expr *z = xcalloc(1, sizeof(*z));
890 z->node = GREP_NODE_TRUE;
891 return z;
892 }
893
894 static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
895 {
896 struct grep_expr *z = xcalloc(1, sizeof(*z));
897 z->node = GREP_NODE_OR;
898 z->u.binary.left = left;
899 z->u.binary.right = right;
900 return z;
901 }
902
903 static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
904 {
905 struct grep_pat *p;
906 struct grep_expr *header_expr;
907 struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
908 enum grep_header_field fld;
909
910 if (!opt->header_list)
911 return NULL;
912
913 for (p = opt->header_list; p; p = p->next) {
914 if (p->token != GREP_PATTERN_HEAD)
915 die("BUG: a non-header pattern in grep header list.");
916 if (p->field < GREP_HEADER_FIELD_MIN ||
917 GREP_HEADER_FIELD_MAX <= p->field)
918 die("BUG: unknown header field %d", p->field);
919 compile_regexp(p, opt);
920 }
921
922 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
923 header_group[fld] = NULL;
924
925 for (p = opt->header_list; p; p = p->next) {
926 struct grep_expr *h;
927 struct grep_pat *pp = p;
928
929 h = compile_pattern_atom(&pp);
930 if (!h || pp != p->next)
931 die("BUG: malformed header expr");
932 if (!header_group[p->field]) {
933 header_group[p->field] = h;
934 continue;
935 }
936 header_group[p->field] = grep_or_expr(h, header_group[p->field]);
937 }
938
939 header_expr = NULL;
940
941 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
942 if (!header_group[fld])
943 continue;
944 if (!header_expr)
945 header_expr = grep_true_expr();
946 header_expr = grep_or_expr(header_group[fld], header_expr);
947 }
948 return header_expr;
949 }
950
951 static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
952 {
953 struct grep_expr *z = x;
954
955 while (x) {
956 assert(x->node == GREP_NODE_OR);
957 if (x->u.binary.right &&
958 x->u.binary.right->node == GREP_NODE_TRUE) {
959 x->u.binary.right = y;
960 break;
961 }
962 x = x->u.binary.right;
963 }
964 return z;
965 }
966
967 static void compile_grep_patterns_real(struct grep_opt *opt)
968 {
969 struct grep_pat *p;
970 struct grep_expr *header_expr = prep_header_patterns(opt);
971
972 for (p = opt->pattern_list; p; p = p->next) {
973 switch (p->token) {
974 case GREP_PATTERN: /* atom */
975 case GREP_PATTERN_HEAD:
976 case GREP_PATTERN_BODY:
977 compile_regexp(p, opt);
978 break;
979 default:
980 opt->extended = 1;
981 break;
982 }
983 }
984
985 if (opt->all_match || header_expr)
986 opt->extended = 1;
987 else if (!opt->extended && !opt->debug)
988 return;
989
990 p = opt->pattern_list;
991 if (p)
992 opt->pattern_expression = compile_pattern_expr(&p);
993 if (p)
994 die("incomplete pattern expression: %s", p->pattern);
995
996 if (!header_expr)
997 return;
998
999 if (!opt->pattern_expression)
1000 opt->pattern_expression = header_expr;
1001 else if (opt->all_match)
1002 opt->pattern_expression = grep_splice_or(header_expr,
1003 opt->pattern_expression);
1004 else
1005 opt->pattern_expression = grep_or_expr(opt->pattern_expression,
1006 header_expr);
1007 opt->all_match = 1;
1008 }
1009
1010 void compile_grep_patterns(struct grep_opt *opt)
1011 {
1012 compile_grep_patterns_real(opt);
1013 if (opt->debug)
1014 dump_grep_expression(opt);
1015 }
1016
1017 static void free_pattern_expr(struct grep_expr *x)
1018 {
1019 switch (x->node) {
1020 case GREP_NODE_TRUE:
1021 case GREP_NODE_ATOM:
1022 break;
1023 case GREP_NODE_NOT:
1024 free_pattern_expr(x->u.unary);
1025 break;
1026 case GREP_NODE_AND:
1027 case GREP_NODE_OR:
1028 free_pattern_expr(x->u.binary.left);
1029 free_pattern_expr(x->u.binary.right);
1030 break;
1031 }
1032 free(x);
1033 }
1034
1035 void free_grep_patterns(struct grep_opt *opt)
1036 {
1037 struct grep_pat *p, *n;
1038
1039 for (p = opt->pattern_list; p; p = n) {
1040 n = p->next;
1041 switch (p->token) {
1042 case GREP_PATTERN: /* atom */
1043 case GREP_PATTERN_HEAD:
1044 case GREP_PATTERN_BODY:
1045 if (p->kws)
1046 kwsfree(p->kws);
1047 else if (p->pcre1_regexp)
1048 free_pcre1_regexp(p);
1049 else if (p->pcre2_pattern)
1050 free_pcre2_pattern(p);
1051 else
1052 regfree(&p->regexp);
1053 free(p->pattern);
1054 break;
1055 default:
1056 break;
1057 }
1058 free(p);
1059 }
1060
1061 if (!opt->extended)
1062 return;
1063 free_pattern_expr(opt->pattern_expression);
1064 }
1065
1066 static char *end_of_line(char *cp, unsigned long *left)
1067 {
1068 unsigned long l = *left;
1069 while (l && *cp != '\n') {
1070 l--;
1071 cp++;
1072 }
1073 *left = l;
1074 return cp;
1075 }
1076
1077 static int word_char(char ch)
1078 {
1079 return isalnum(ch) || ch == '_';
1080 }
1081
1082 static void output_color(struct grep_opt *opt, const void *data, size_t size,
1083 const char *color)
1084 {
1085 if (want_color(opt->color) && color && color[0]) {
1086 opt->output(opt, color, strlen(color));
1087 opt->output(opt, data, size);
1088 opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
1089 } else
1090 opt->output(opt, data, size);
1091 }
1092
1093 static void output_sep(struct grep_opt *opt, char sign)
1094 {
1095 if (opt->null_following_name)
1096 opt->output(opt, "\0", 1);
1097 else
1098 output_color(opt, &sign, 1, opt->color_sep);
1099 }
1100
1101 static void show_name(struct grep_opt *opt, const char *name)
1102 {
1103 output_color(opt, name, strlen(name), opt->color_filename);
1104 opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
1105 }
1106
1107 static int fixmatch(struct grep_pat *p, char *line, char *eol,
1108 regmatch_t *match)
1109 {
1110 struct kwsmatch kwsm;
1111 size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
1112 if (offset == -1) {
1113 match->rm_so = match->rm_eo = -1;
1114 return REG_NOMATCH;
1115 } else {
1116 match->rm_so = offset;
1117 match->rm_eo = match->rm_so + kwsm.size[0];
1118 return 0;
1119 }
1120 }
1121
1122 static int patmatch(struct grep_pat *p, char *line, char *eol,
1123 regmatch_t *match, int eflags)
1124 {
1125 int hit;
1126
1127 if (p->fixed)
1128 hit = !fixmatch(p, line, eol, match);
1129 else if (p->pcre1_regexp)
1130 hit = !pcre1match(p, line, eol, match, eflags);
1131 else if (p->pcre2_pattern)
1132 hit = !pcre2match(p, line, eol, match, eflags);
1133 else
1134 hit = !regexec_buf(&p->regexp, line, eol - line, 1, match,
1135 eflags);
1136
1137 return hit;
1138 }
1139
1140 static int strip_timestamp(char *bol, char **eol_p)
1141 {
1142 char *eol = *eol_p;
1143 int ch;
1144
1145 while (bol < --eol) {
1146 if (*eol != '>')
1147 continue;
1148 *eol_p = ++eol;
1149 ch = *eol;
1150 *eol = '\0';
1151 return ch;
1152 }
1153 return 0;
1154 }
1155
1156 static struct {
1157 const char *field;
1158 size_t len;
1159 } header_field[] = {
1160 { "author ", 7 },
1161 { "committer ", 10 },
1162 { "reflog ", 7 },
1163 };
1164
1165 static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
1166 enum grep_context ctx,
1167 regmatch_t *pmatch, int eflags)
1168 {
1169 int hit = 0;
1170 int saved_ch = 0;
1171 const char *start = bol;
1172
1173 if ((p->token != GREP_PATTERN) &&
1174 ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
1175 return 0;
1176
1177 if (p->token == GREP_PATTERN_HEAD) {
1178 const char *field;
1179 size_t len;
1180 assert(p->field < ARRAY_SIZE(header_field));
1181 field = header_field[p->field].field;
1182 len = header_field[p->field].len;
1183 if (strncmp(bol, field, len))
1184 return 0;
1185 bol += len;
1186 switch (p->field) {
1187 case GREP_HEADER_AUTHOR:
1188 case GREP_HEADER_COMMITTER:
1189 saved_ch = strip_timestamp(bol, &eol);
1190 break;
1191 default:
1192 break;
1193 }
1194 }
1195
1196 again:
1197 hit = patmatch(p, bol, eol, pmatch, eflags);
1198
1199 if (hit && p->word_regexp) {
1200 if ((pmatch[0].rm_so < 0) ||
1201 (eol - bol) < pmatch[0].rm_so ||
1202 (pmatch[0].rm_eo < 0) ||
1203 (eol - bol) < pmatch[0].rm_eo)
1204 die("regexp returned nonsense");
1205
1206 /* Match beginning must be either beginning of the
1207 * line, or at word boundary (i.e. the last char must
1208 * not be a word char). Similarly, match end must be
1209 * either end of the line, or at word boundary
1210 * (i.e. the next char must not be a word char).
1211 */
1212 if ( ((pmatch[0].rm_so == 0) ||
1213 !word_char(bol[pmatch[0].rm_so-1])) &&
1214 ((pmatch[0].rm_eo == (eol-bol)) ||
1215 !word_char(bol[pmatch[0].rm_eo])) )
1216 ;
1217 else
1218 hit = 0;
1219
1220 /* Words consist of at least one character. */
1221 if (pmatch->rm_so == pmatch->rm_eo)
1222 hit = 0;
1223
1224 if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
1225 /* There could be more than one match on the
1226 * line, and the first match might not be
1227 * strict word match. But later ones could be!
1228 * Forward to the next possible start, i.e. the
1229 * next position following a non-word char.
1230 */
1231 bol = pmatch[0].rm_so + bol + 1;
1232 while (word_char(bol[-1]) && bol < eol)
1233 bol++;
1234 eflags |= REG_NOTBOL;
1235 if (bol < eol)
1236 goto again;
1237 }
1238 }
1239 if (p->token == GREP_PATTERN_HEAD && saved_ch)
1240 *eol = saved_ch;
1241 if (hit) {
1242 pmatch[0].rm_so += bol - start;
1243 pmatch[0].rm_eo += bol - start;
1244 }
1245 return hit;
1246 }
1247
1248 static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
1249 enum grep_context ctx, int collect_hits)
1250 {
1251 int h = 0;
1252 regmatch_t match;
1253
1254 if (!x)
1255 die("Not a valid grep expression");
1256 switch (x->node) {
1257 case GREP_NODE_TRUE:
1258 h = 1;
1259 break;
1260 case GREP_NODE_ATOM:
1261 h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
1262 break;
1263 case GREP_NODE_NOT:
1264 h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
1265 break;
1266 case GREP_NODE_AND:
1267 if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
1268 return 0;
1269 h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
1270 break;
1271 case GREP_NODE_OR:
1272 if (!collect_hits)
1273 return (match_expr_eval(x->u.binary.left,
1274 bol, eol, ctx, 0) ||
1275 match_expr_eval(x->u.binary.right,
1276 bol, eol, ctx, 0));
1277 h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
1278 x->u.binary.left->hit |= h;
1279 h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
1280 break;
1281 default:
1282 die("Unexpected node type (internal error) %d", x->node);
1283 }
1284 if (collect_hits)
1285 x->hit |= h;
1286 return h;
1287 }
1288
1289 static int match_expr(struct grep_opt *opt, char *bol, char *eol,
1290 enum grep_context ctx, int collect_hits)
1291 {
1292 struct grep_expr *x = opt->pattern_expression;
1293 return match_expr_eval(x, bol, eol, ctx, collect_hits);
1294 }
1295
1296 static int match_line(struct grep_opt *opt, char *bol, char *eol,
1297 enum grep_context ctx, int collect_hits)
1298 {
1299 struct grep_pat *p;
1300 regmatch_t match;
1301
1302 if (opt->extended)
1303 return match_expr(opt, bol, eol, ctx, collect_hits);
1304
1305 /* we do not call with collect_hits without being extended */
1306 for (p = opt->pattern_list; p; p = p->next) {
1307 if (match_one_pattern(p, bol, eol, ctx, &match, 0))
1308 return 1;
1309 }
1310 return 0;
1311 }
1312
1313 static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
1314 enum grep_context ctx,
1315 regmatch_t *pmatch, int eflags)
1316 {
1317 regmatch_t match;
1318
1319 if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
1320 return 0;
1321 if (match.rm_so < 0 || match.rm_eo < 0)
1322 return 0;
1323 if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
1324 if (match.rm_so > pmatch->rm_so)
1325 return 1;
1326 if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
1327 return 1;
1328 }
1329 pmatch->rm_so = match.rm_so;
1330 pmatch->rm_eo = match.rm_eo;
1331 return 1;
1332 }
1333
1334 static int next_match(struct grep_opt *opt, char *bol, char *eol,
1335 enum grep_context ctx, regmatch_t *pmatch, int eflags)
1336 {
1337 struct grep_pat *p;
1338 int hit = 0;
1339
1340 pmatch->rm_so = pmatch->rm_eo = -1;
1341 if (bol < eol) {
1342 for (p = opt->pattern_list; p; p = p->next) {
1343 switch (p->token) {
1344 case GREP_PATTERN: /* atom */
1345 case GREP_PATTERN_HEAD:
1346 case GREP_PATTERN_BODY:
1347 hit |= match_next_pattern(p, bol, eol, ctx,
1348 pmatch, eflags);
1349 break;
1350 default:
1351 break;
1352 }
1353 }
1354 }
1355 return hit;
1356 }
1357
1358 static void show_line(struct grep_opt *opt, char *bol, char *eol,
1359 const char *name, unsigned lno, char sign)
1360 {
1361 int rest = eol - bol;
1362 const char *match_color, *line_color = NULL;
1363
1364 if (opt->file_break && opt->last_shown == 0) {
1365 if (opt->show_hunk_mark)
1366 opt->output(opt, "\n", 1);
1367 } else if (opt->pre_context || opt->post_context || opt->funcbody) {
1368 if (opt->last_shown == 0) {
1369 if (opt->show_hunk_mark) {
1370 output_color(opt, "--", 2, opt->color_sep);
1371 opt->output(opt, "\n", 1);
1372 }
1373 } else if (lno > opt->last_shown + 1) {
1374 output_color(opt, "--", 2, opt->color_sep);
1375 opt->output(opt, "\n", 1);
1376 }
1377 }
1378 if (opt->heading && opt->last_shown == 0) {
1379 output_color(opt, name, strlen(name), opt->color_filename);
1380 opt->output(opt, "\n", 1);
1381 }
1382 opt->last_shown = lno;
1383
1384 if (!opt->heading && opt->pathname) {
1385 output_color(opt, name, strlen(name), opt->color_filename);
1386 output_sep(opt, sign);
1387 }
1388 if (opt->linenum) {
1389 char buf[32];
1390 xsnprintf(buf, sizeof(buf), "%d", lno);
1391 output_color(opt, buf, strlen(buf), opt->color_lineno);
1392 output_sep(opt, sign);
1393 }
1394 if (opt->color) {
1395 regmatch_t match;
1396 enum grep_context ctx = GREP_CONTEXT_BODY;
1397 int ch = *eol;
1398 int eflags = 0;
1399
1400 if (sign == ':')
1401 match_color = opt->color_match_selected;
1402 else
1403 match_color = opt->color_match_context;
1404 if (sign == ':')
1405 line_color = opt->color_selected;
1406 else if (sign == '-')
1407 line_color = opt->color_context;
1408 else if (sign == '=')
1409 line_color = opt->color_function;
1410 *eol = '\0';
1411 while (next_match(opt, bol, eol, ctx, &match, eflags)) {
1412 if (match.rm_so == match.rm_eo)
1413 break;
1414
1415 output_color(opt, bol, match.rm_so, line_color);
1416 output_color(opt, bol + match.rm_so,
1417 match.rm_eo - match.rm_so, match_color);
1418 bol += match.rm_eo;
1419 rest -= match.rm_eo;
1420 eflags = REG_NOTBOL;
1421 }
1422 *eol = ch;
1423 }
1424 output_color(opt, bol, rest, line_color);
1425 opt->output(opt, "\n", 1);
1426 }
1427
1428 #ifndef NO_PTHREADS
1429 int grep_use_locks;
1430
1431 /*
1432 * This lock protects access to the gitattributes machinery, which is
1433 * not thread-safe.
1434 */
1435 pthread_mutex_t grep_attr_mutex;
1436
1437 static inline void grep_attr_lock(void)
1438 {
1439 if (grep_use_locks)
1440 pthread_mutex_lock(&grep_attr_mutex);
1441 }
1442
1443 static inline void grep_attr_unlock(void)
1444 {
1445 if (grep_use_locks)
1446 pthread_mutex_unlock(&grep_attr_mutex);
1447 }
1448
1449 /*
1450 * Same as git_attr_mutex, but protecting the thread-unsafe object db access.
1451 */
1452 pthread_mutex_t grep_read_mutex;
1453
1454 #else
1455 #define grep_attr_lock()
1456 #define grep_attr_unlock()
1457 #endif
1458
1459 static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
1460 {
1461 xdemitconf_t *xecfg = opt->priv;
1462 if (xecfg && !xecfg->find_func) {
1463 grep_source_load_driver(gs);
1464 if (gs->driver->funcname.pattern) {
1465 const struct userdiff_funcname *pe = &gs->driver->funcname;
1466 xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
1467 } else {
1468 xecfg = opt->priv = NULL;
1469 }
1470 }
1471
1472 if (xecfg) {
1473 char buf[1];
1474 return xecfg->find_func(bol, eol - bol, buf, 1,
1475 xecfg->find_func_priv) >= 0;
1476 }
1477
1478 if (bol == eol)
1479 return 0;
1480 if (isalpha(*bol) || *bol == '_' || *bol == '$')
1481 return 1;
1482 return 0;
1483 }
1484
1485 static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
1486 char *bol, unsigned lno)
1487 {
1488 while (bol > gs->buf) {
1489 char *eol = --bol;
1490
1491 while (bol > gs->buf && bol[-1] != '\n')
1492 bol--;
1493 lno--;
1494
1495 if (lno <= opt->last_shown)
1496 break;
1497
1498 if (match_funcname(opt, gs, bol, eol)) {
1499 show_line(opt, bol, eol, gs->name, lno, '=');
1500 break;
1501 }
1502 }
1503 }
1504
1505 static int is_empty_line(const char *bol, const char *eol);
1506
1507 static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
1508 char *bol, char *end, unsigned lno)
1509 {
1510 unsigned cur = lno, from = 1, funcname_lno = 0, orig_from;
1511 int funcname_needed = !!opt->funcname, comment_needed = 0;
1512
1513 if (opt->pre_context < lno)
1514 from = lno - opt->pre_context;
1515 if (from <= opt->last_shown)
1516 from = opt->last_shown + 1;
1517 orig_from = from;
1518 if (opt->funcbody) {
1519 if (match_funcname(opt, gs, bol, end))
1520 comment_needed = 1;
1521 else
1522 funcname_needed = 1;
1523 from = opt->last_shown + 1;
1524 }
1525
1526 /* Rewind. */
1527 while (bol > gs->buf && cur > from) {
1528 char *next_bol = bol;
1529 char *eol = --bol;
1530
1531 while (bol > gs->buf && bol[-1] != '\n')
1532 bol--;
1533 cur--;
1534 if (comment_needed && (is_empty_line(bol, eol) ||
1535 match_funcname(opt, gs, bol, eol))) {
1536 comment_needed = 0;
1537 from = orig_from;
1538 if (cur < from) {
1539 cur++;
1540 bol = next_bol;
1541 break;
1542 }
1543 }
1544 if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
1545 funcname_lno = cur;
1546 funcname_needed = 0;
1547 if (opt->funcbody)
1548 comment_needed = 1;
1549 else
1550 from = orig_from;
1551 }
1552 }
1553
1554 /* We need to look even further back to find a function signature. */
1555 if (opt->funcname && funcname_needed)
1556 show_funcname_line(opt, gs, bol, cur);
1557
1558 /* Back forward. */
1559 while (cur < lno) {
1560 char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
1561
1562 while (*eol != '\n')
1563 eol++;
1564 show_line(opt, bol, eol, gs->name, cur, sign);
1565 bol = eol + 1;
1566 cur++;
1567 }
1568 }
1569
1570 static int should_lookahead(struct grep_opt *opt)
1571 {
1572 struct grep_pat *p;
1573
1574 if (opt->extended)
1575 return 0; /* punt for too complex stuff */
1576 if (opt->invert)
1577 return 0;
1578 for (p = opt->pattern_list; p; p = p->next) {
1579 if (p->token != GREP_PATTERN)
1580 return 0; /* punt for "header only" and stuff */
1581 }
1582 return 1;
1583 }
1584
1585 static int look_ahead(struct grep_opt *opt,
1586 unsigned long *left_p,
1587 unsigned *lno_p,
1588 char **bol_p)
1589 {
1590 unsigned lno = *lno_p;
1591 char *bol = *bol_p;
1592 struct grep_pat *p;
1593 char *sp, *last_bol;
1594 regoff_t earliest = -1;
1595
1596 for (p = opt->pattern_list; p; p = p->next) {
1597 int hit;
1598 regmatch_t m;
1599
1600 hit = patmatch(p, bol, bol + *left_p, &m, 0);
1601 if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1602 continue;
1603 if (earliest < 0 || m.rm_so < earliest)
1604 earliest = m.rm_so;
1605 }
1606
1607 if (earliest < 0) {
1608 *bol_p = bol + *left_p;
1609 *left_p = 0;
1610 return 1;
1611 }
1612 for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1613 ; /* find the beginning of the line */
1614 last_bol = sp;
1615
1616 for (sp = bol; sp < last_bol; sp++) {
1617 if (*sp == '\n')
1618 lno++;
1619 }
1620 *left_p -= last_bol - bol;
1621 *bol_p = last_bol;
1622 *lno_p = lno;
1623 return 0;
1624 }
1625
1626 static int fill_textconv_grep(struct userdiff_driver *driver,
1627 struct grep_source *gs)
1628 {
1629 struct diff_filespec *df;
1630 char *buf;
1631 size_t size;
1632
1633 if (!driver || !driver->textconv)
1634 return grep_source_load(gs);
1635
1636 /*
1637 * The textconv interface is intimately tied to diff_filespecs, so we
1638 * have to pretend to be one. If we could unify the grep_source
1639 * and diff_filespec structs, this mess could just go away.
1640 */
1641 df = alloc_filespec(gs->path);
1642 switch (gs->type) {
1643 case GREP_SOURCE_OID:
1644 fill_filespec(df, gs->identifier, 1, 0100644);
1645 break;
1646 case GREP_SOURCE_FILE:
1647 fill_filespec(df, &null_oid, 0, 0100644);
1648 break;
1649 default:
1650 die("BUG: attempt to textconv something without a path?");
1651 }
1652
1653 /*
1654 * fill_textconv is not remotely thread-safe; it may load objects
1655 * behind the scenes, and it modifies the global diff tempfile
1656 * structure.
1657 */
1658 grep_read_lock();
1659 size = fill_textconv(driver, df, &buf);
1660 grep_read_unlock();
1661 free_filespec(df);
1662
1663 /*
1664 * The normal fill_textconv usage by the diff machinery would just keep
1665 * the textconv'd buf separate from the diff_filespec. But much of the
1666 * grep code passes around a grep_source and assumes that its "buf"
1667 * pointer is the beginning of the thing we are searching. So let's
1668 * install our textconv'd version into the grep_source, taking care not
1669 * to leak any existing buffer.
1670 */
1671 grep_source_clear_data(gs);
1672 gs->buf = buf;
1673 gs->size = size;
1674
1675 return 0;
1676 }
1677
1678 static int is_empty_line(const char *bol, const char *eol)
1679 {
1680 while (bol < eol && isspace(*bol))
1681 bol++;
1682 return bol == eol;
1683 }
1684
1685 static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
1686 {
1687 char *bol;
1688 char *peek_bol = NULL;
1689 unsigned long left;
1690 unsigned lno = 1;
1691 unsigned last_hit = 0;
1692 int binary_match_only = 0;
1693 unsigned count = 0;
1694 int try_lookahead = 0;
1695 int show_function = 0;
1696 struct userdiff_driver *textconv = NULL;
1697 enum grep_context ctx = GREP_CONTEXT_HEAD;
1698 xdemitconf_t xecfg;
1699
1700 if (!opt->output)
1701 opt->output = std_output;
1702
1703 if (opt->pre_context || opt->post_context || opt->file_break ||
1704 opt->funcbody) {
1705 /* Show hunk marks, except for the first file. */
1706 if (opt->last_shown)
1707 opt->show_hunk_mark = 1;
1708 /*
1709 * If we're using threads then we can't easily identify
1710 * the first file. Always put hunk marks in that case
1711 * and skip the very first one later in work_done().
1712 */
1713 if (opt->output != std_output)
1714 opt->show_hunk_mark = 1;
1715 }
1716 opt->last_shown = 0;
1717
1718 if (opt->allow_textconv) {
1719 grep_source_load_driver(gs);
1720 /*
1721 * We might set up the shared textconv cache data here, which
1722 * is not thread-safe.
1723 */
1724 grep_attr_lock();
1725 textconv = userdiff_get_textconv(gs->driver);
1726 grep_attr_unlock();
1727 }
1728
1729 /*
1730 * We know the result of a textconv is text, so we only have to care
1731 * about binary handling if we are not using it.
1732 */
1733 if (!textconv) {
1734 switch (opt->binary) {
1735 case GREP_BINARY_DEFAULT:
1736 if (grep_source_is_binary(gs))
1737 binary_match_only = 1;
1738 break;
1739 case GREP_BINARY_NOMATCH:
1740 if (grep_source_is_binary(gs))
1741 return 0; /* Assume unmatch */
1742 break;
1743 case GREP_BINARY_TEXT:
1744 break;
1745 default:
1746 die("BUG: unknown binary handling mode");
1747 }
1748 }
1749
1750 memset(&xecfg, 0, sizeof(xecfg));
1751 opt->priv = &xecfg;
1752
1753 try_lookahead = should_lookahead(opt);
1754
1755 if (fill_textconv_grep(textconv, gs) < 0)
1756 return 0;
1757
1758 bol = gs->buf;
1759 left = gs->size;
1760 while (left) {
1761 char *eol, ch;
1762 int hit;
1763
1764 /*
1765 * look_ahead() skips quickly to the line that possibly
1766 * has the next hit; don't call it if we need to do
1767 * something more than just skipping the current line
1768 * in response to an unmatch for the current line. E.g.
1769 * inside a post-context window, we will show the current
1770 * line as a context around the previous hit when it
1771 * doesn't hit.
1772 */
1773 if (try_lookahead
1774 && !(last_hit
1775 && (show_function ||
1776 lno <= last_hit + opt->post_context))
1777 && look_ahead(opt, &left, &lno, &bol))
1778 break;
1779 eol = end_of_line(bol, &left);
1780 ch = *eol;
1781 *eol = 0;
1782
1783 if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1784 ctx = GREP_CONTEXT_BODY;
1785
1786 hit = match_line(opt, bol, eol, ctx, collect_hits);
1787 *eol = ch;
1788
1789 if (collect_hits)
1790 goto next_line;
1791
1792 /* "grep -v -e foo -e bla" should list lines
1793 * that do not have either, so inversion should
1794 * be done outside.
1795 */
1796 if (opt->invert)
1797 hit = !hit;
1798 if (opt->unmatch_name_only) {
1799 if (hit)
1800 return 0;
1801 goto next_line;
1802 }
1803 if (hit) {
1804 count++;
1805 if (opt->status_only)
1806 return 1;
1807 if (opt->name_only) {
1808 show_name(opt, gs->name);
1809 return 1;
1810 }
1811 if (opt->count)
1812 goto next_line;
1813 if (binary_match_only) {
1814 opt->output(opt, "Binary file ", 12);
1815 output_color(opt, gs->name, strlen(gs->name),
1816 opt->color_filename);
1817 opt->output(opt, " matches\n", 9);
1818 return 1;
1819 }
1820 /* Hit at this line. If we haven't shown the
1821 * pre-context lines, we would need to show them.
1822 */
1823 if (opt->pre_context || opt->funcbody)
1824 show_pre_context(opt, gs, bol, eol, lno);
1825 else if (opt->funcname)
1826 show_funcname_line(opt, gs, bol, lno);
1827 show_line(opt, bol, eol, gs->name, lno, ':');
1828 last_hit = lno;
1829 if (opt->funcbody)
1830 show_function = 1;
1831 goto next_line;
1832 }
1833 if (show_function && (!peek_bol || peek_bol < bol)) {
1834 unsigned long peek_left = left;
1835 char *peek_eol = eol;
1836
1837 /*
1838 * Trailing empty lines are not interesting.
1839 * Peek past them to see if they belong to the
1840 * body of the current function.
1841 */
1842 peek_bol = bol;
1843 while (is_empty_line(peek_bol, peek_eol)) {
1844 peek_bol = peek_eol + 1;
1845 peek_eol = end_of_line(peek_bol, &peek_left);
1846 }
1847
1848 if (match_funcname(opt, gs, peek_bol, peek_eol))
1849 show_function = 0;
1850 }
1851 if (show_function ||
1852 (last_hit && lno <= last_hit + opt->post_context)) {
1853 /* If the last hit is within the post context,
1854 * we need to show this line.
1855 */
1856 show_line(opt, bol, eol, gs->name, lno, '-');
1857 }
1858
1859 next_line:
1860 bol = eol + 1;
1861 if (!left)
1862 break;
1863 left--;
1864 lno++;
1865 }
1866
1867 if (collect_hits)
1868 return 0;
1869
1870 if (opt->status_only)
1871 return opt->unmatch_name_only;
1872 if (opt->unmatch_name_only) {
1873 /* We did not see any hit, so we want to show this */
1874 show_name(opt, gs->name);
1875 return 1;
1876 }
1877
1878 xdiff_clear_find_func(&xecfg);
1879 opt->priv = NULL;
1880
1881 /* NEEDSWORK:
1882 * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1883 * which feels mostly useless but sometimes useful. Maybe
1884 * make it another option? For now suppress them.
1885 */
1886 if (opt->count && count) {
1887 char buf[32];
1888 if (opt->pathname) {
1889 output_color(opt, gs->name, strlen(gs->name),
1890 opt->color_filename);
1891 output_sep(opt, ':');
1892 }
1893 xsnprintf(buf, sizeof(buf), "%u\n", count);
1894 opt->output(opt, buf, strlen(buf));
1895 return 1;
1896 }
1897 return !!last_hit;
1898 }
1899
1900 static void clr_hit_marker(struct grep_expr *x)
1901 {
1902 /* All-hit markers are meaningful only at the very top level
1903 * OR node.
1904 */
1905 while (1) {
1906 x->hit = 0;
1907 if (x->node != GREP_NODE_OR)
1908 return;
1909 x->u.binary.left->hit = 0;
1910 x = x->u.binary.right;
1911 }
1912 }
1913
1914 static int chk_hit_marker(struct grep_expr *x)
1915 {
1916 /* Top level nodes have hit markers. See if they all are hits */
1917 while (1) {
1918 if (x->node != GREP_NODE_OR)
1919 return x->hit;
1920 if (!x->u.binary.left->hit)
1921 return 0;
1922 x = x->u.binary.right;
1923 }
1924 }
1925
1926 int grep_source(struct grep_opt *opt, struct grep_source *gs)
1927 {
1928 /*
1929 * we do not have to do the two-pass grep when we do not check
1930 * buffer-wide "all-match".
1931 */
1932 if (!opt->all_match)
1933 return grep_source_1(opt, gs, 0);
1934
1935 /* Otherwise the toplevel "or" terms hit a bit differently.
1936 * We first clear hit markers from them.
1937 */
1938 clr_hit_marker(opt->pattern_expression);
1939 grep_source_1(opt, gs, 1);
1940
1941 if (!chk_hit_marker(opt->pattern_expression))
1942 return 0;
1943
1944 return grep_source_1(opt, gs, 0);
1945 }
1946
1947 int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
1948 {
1949 struct grep_source gs;
1950 int r;
1951
1952 grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL, NULL);
1953 gs.buf = buf;
1954 gs.size = size;
1955
1956 r = grep_source(opt, &gs);
1957
1958 grep_source_clear(&gs);
1959 return r;
1960 }
1961
1962 void grep_source_init(struct grep_source *gs, enum grep_source_type type,
1963 const char *name, const char *path,
1964 const void *identifier)
1965 {
1966 gs->type = type;
1967 gs->name = xstrdup_or_null(name);
1968 gs->path = xstrdup_or_null(path);
1969 gs->buf = NULL;
1970 gs->size = 0;
1971 gs->driver = NULL;
1972
1973 switch (type) {
1974 case GREP_SOURCE_FILE:
1975 gs->identifier = xstrdup(identifier);
1976 break;
1977 case GREP_SOURCE_OID:
1978 gs->identifier = oiddup(identifier);
1979 break;
1980 case GREP_SOURCE_BUF:
1981 gs->identifier = NULL;
1982 break;
1983 }
1984 }
1985
1986 void grep_source_clear(struct grep_source *gs)
1987 {
1988 FREE_AND_NULL(gs->name);
1989 FREE_AND_NULL(gs->path);
1990 FREE_AND_NULL(gs->identifier);
1991 grep_source_clear_data(gs);
1992 }
1993
1994 void grep_source_clear_data(struct grep_source *gs)
1995 {
1996 switch (gs->type) {
1997 case GREP_SOURCE_FILE:
1998 case GREP_SOURCE_OID:
1999 FREE_AND_NULL(gs->buf);
2000 gs->size = 0;
2001 break;
2002 case GREP_SOURCE_BUF:
2003 /* leave user-provided buf intact */
2004 break;
2005 }
2006 }
2007
2008 static int grep_source_load_oid(struct grep_source *gs)
2009 {
2010 enum object_type type;
2011
2012 grep_read_lock();
2013 gs->buf = read_sha1_file(gs->identifier, &type, &gs->size);
2014 grep_read_unlock();
2015
2016 if (!gs->buf)
2017 return error(_("'%s': unable to read %s"),
2018 gs->name,
2019 oid_to_hex(gs->identifier));
2020 return 0;
2021 }
2022
2023 static int grep_source_load_file(struct grep_source *gs)
2024 {
2025 const char *filename = gs->identifier;
2026 struct stat st;
2027 char *data;
2028 size_t size;
2029 int i;
2030
2031 if (lstat(filename, &st) < 0) {
2032 err_ret:
2033 if (errno != ENOENT)
2034 error_errno(_("failed to stat '%s'"), filename);
2035 return -1;
2036 }
2037 if (!S_ISREG(st.st_mode))
2038 return -1;
2039 size = xsize_t(st.st_size);
2040 i = open(filename, O_RDONLY);
2041 if (i < 0)
2042 goto err_ret;
2043 data = xmallocz(size);
2044 if (st.st_size != read_in_full(i, data, size)) {
2045 error_errno(_("'%s': short read"), filename);
2046 close(i);
2047 free(data);
2048 return -1;
2049 }
2050 close(i);
2051
2052 gs->buf = data;
2053 gs->size = size;
2054 return 0;
2055 }
2056
2057 static int grep_source_load(struct grep_source *gs)
2058 {
2059 if (gs->buf)
2060 return 0;
2061
2062 switch (gs->type) {
2063 case GREP_SOURCE_FILE:
2064 return grep_source_load_file(gs);
2065 case GREP_SOURCE_OID:
2066 return grep_source_load_oid(gs);
2067 case GREP_SOURCE_BUF:
2068 return gs->buf ? 0 : -1;
2069 }
2070 die("BUG: invalid grep_source type to load");
2071 }
2072
2073 void grep_source_load_driver(struct grep_source *gs)
2074 {
2075 if (gs->driver)
2076 return;
2077
2078 grep_attr_lock();
2079 if (gs->path)
2080 gs->driver = userdiff_find_by_path(gs->path);
2081 if (!gs->driver)
2082 gs->driver = userdiff_find_by_name("default");
2083 grep_attr_unlock();
2084 }
2085
2086 static int grep_source_is_binary(struct grep_source *gs)
2087 {
2088 grep_source_load_driver(gs);
2089 if (gs->driver->binary != -1)
2090 return gs->driver->binary;
2091
2092 if (!grep_source_load(gs))
2093 return buffer_is_binary(gs->buf, gs->size);
2094
2095 return 0;
2096 }
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