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hashmap: adjust documentation to reflect reality
[git/debian.git] / grep.c
blobd0b9b6cdfa74537ed67dcfef4ae486466d7185f8
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
481 assert(opt->pcre2);
482
483 p->pcre2_compile_context = NULL;
484
485 if (opt->ignore_case) {
486 if (has_non_ascii(p->pattern)) {
487 character_tables = pcre2_maketables(NULL);
488 p->pcre2_compile_context = pcre2_compile_context_create(NULL);
489 pcre2_set_character_tables(p->pcre2_compile_context, character_tables);
490 }
491 options |= PCRE2_CASELESS;
492 }
493 if (is_utf8_locale() && has_non_ascii(p->pattern))
494 options |= PCRE2_UTF;
495
496 p->pcre2_pattern = pcre2_compile((PCRE2_SPTR)p->pattern,
497 p->patternlen, options, &error, &erroffset,
498 p->pcre2_compile_context);
499
500 if (p->pcre2_pattern) {
501 p->pcre2_match_data = pcre2_match_data_create_from_pattern(p->pcre2_pattern, NULL);
502 if (!p->pcre2_match_data)
503 die("Couldn't allocate PCRE2 match data");
504 } else {
505 pcre2_get_error_message(error, errbuf, sizeof(errbuf));
506 compile_regexp_failed(p, (const char *)&errbuf);
507 }
508
509 pcre2_config(PCRE2_CONFIG_JIT, &p->pcre2_jit_on);
510 if (p->pcre2_jit_on == 1) {
511 jitret = pcre2_jit_compile(p->pcre2_pattern, PCRE2_JIT_COMPLETE);
512 if (jitret)
513 die("Couldn't JIT the PCRE2 pattern '%s', got '%d'\n", p->pattern, jitret);
514 p->pcre2_jit_stack = pcre2_jit_stack_create(1, 1024 * 1024, NULL);
515 if (!p->pcre2_jit_stack)
516 die("Couldn't allocate PCRE2 JIT stack");
517 p->pcre2_match_context = pcre2_match_context_create(NULL);
518 if (!p->pcre2_match_context)
519 die("Couldn't allocate PCRE2 match context");
520 pcre2_jit_stack_assign(p->pcre2_match_context, NULL, p->pcre2_jit_stack);
521 } else if (p->pcre2_jit_on != 0) {
522 die("BUG: The pcre2_jit_on variable should be 0 or 1, not %d",
523 p->pcre1_jit_on);
524 }
525 }
526
527 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
528 regmatch_t *match, int eflags)
529 {
530 int ret, flags = 0;
531 PCRE2_SIZE *ovector;
532 PCRE2_UCHAR errbuf[256];
533
534 if (eflags & REG_NOTBOL)
535 flags |= PCRE2_NOTBOL;
536
537 if (p->pcre2_jit_on)
538 ret = pcre2_jit_match(p->pcre2_pattern, (unsigned char *)line,
539 eol - line, 0, flags, p->pcre2_match_data,
540 NULL);
541 else
542 ret = pcre2_match(p->pcre2_pattern, (unsigned char *)line,
543 eol - line, 0, flags, p->pcre2_match_data,
544 NULL);
545
546 if (ret < 0 && ret != PCRE2_ERROR_NOMATCH) {
547 pcre2_get_error_message(ret, errbuf, sizeof(errbuf));
548 die("%s failed with error code %d: %s",
549 (p->pcre2_jit_on ? "pcre2_jit_match" : "pcre2_match"), ret,
550 errbuf);
551 }
552 if (ret > 0) {
553 ovector = pcre2_get_ovector_pointer(p->pcre2_match_data);
554 ret = 0;
555 match->rm_so = (int)ovector[0];
556 match->rm_eo = (int)ovector[1];
557 }
558
559 return ret;
560 }
561
562 static void free_pcre2_pattern(struct grep_pat *p)
563 {
564 pcre2_compile_context_free(p->pcre2_compile_context);
565 pcre2_code_free(p->pcre2_pattern);
566 pcre2_match_data_free(p->pcre2_match_data);
567 pcre2_jit_stack_free(p->pcre2_jit_stack);
568 pcre2_match_context_free(p->pcre2_match_context);
569 }
570 #else /* !USE_LIBPCRE2 */
571 static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
572 {
573 /*
574 * Unreachable until USE_LIBPCRE2 becomes synonymous with
575 * USE_LIBPCRE. See the sibling comment in
576 * grep_set_pattern_type_option().
577 */
578 die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
579 }
580
581 static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
582 regmatch_t *match, int eflags)
583 {
584 return 1;
585 }
586
587 static void free_pcre2_pattern(struct grep_pat *p)
588 {
589 }
590 #endif /* !USE_LIBPCRE2 */
591
592 static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
593 {
594 struct strbuf sb = STRBUF_INIT;
595 int err;
596 int regflags = 0;
597
598 basic_regex_quote_buf(&sb, p->pattern);
599 if (opt->ignore_case)
600 regflags |= REG_ICASE;
601 err = regcomp(&p->regexp, sb.buf, regflags);
602 if (opt->debug)
603 fprintf(stderr, "fixed %s\n", sb.buf);
604 strbuf_release(&sb);
605 if (err) {
606 char errbuf[1024];
607 regerror(err, &p->regexp, errbuf, sizeof(errbuf));
608 regfree(&p->regexp);
609 compile_regexp_failed(p, errbuf);
610 }
611 }
612
613 static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
614 {
615 int ascii_only;
616 int err;
617 int regflags = REG_NEWLINE;
618
619 p->word_regexp = opt->word_regexp;
620 p->ignore_case = opt->ignore_case;
621 ascii_only = !has_non_ascii(p->pattern);
622
623 /*
624 * Even when -F (fixed) asks us to do a non-regexp search, we
625 * may not be able to correctly case-fold when -i
626 * (ignore-case) is asked (in which case, we'll synthesize a
627 * regexp to match the pattern that matches regexp special
628 * characters literally, while ignoring case differences). On
629 * the other hand, even without -F, if the pattern does not
630 * have any regexp special characters and there is no need for
631 * case-folding search, we can internally turn it into a
632 * simple string match using kws. p->fixed tells us if we
633 * want to use kws.
634 */
635 if (opt->fixed ||
636 has_null(p->pattern, p->patternlen) ||
637 is_fixed(p->pattern, p->patternlen))
638 p->fixed = !p->ignore_case || ascii_only;
639
640 if (p->fixed) {
641 p->kws = kwsalloc(p->ignore_case ? tolower_trans_tbl : NULL);
642 kwsincr(p->kws, p->pattern, p->patternlen);
643 kwsprep(p->kws);
644 return;
645 } else if (opt->fixed) {
646 /*
647 * We come here when the pattern has the non-ascii
648 * characters we cannot case-fold, and asked to
649 * ignore-case.
650 */
651 compile_fixed_regexp(p, opt);
652 return;
653 }
654
655 if (opt->pcre2) {
656 compile_pcre2_pattern(p, opt);
657 return;
658 }
659
660 if (opt->pcre1) {
661 compile_pcre1_regexp(p, opt);
662 return;
663 }
664
665 if (p->ignore_case)
666 regflags |= REG_ICASE;
667 if (opt->extended_regexp_option)
668 regflags |= REG_EXTENDED;
669 err = regcomp(&p->regexp, p->pattern, regflags);
670 if (err) {
671 char errbuf[1024];
672 regerror(err, &p->regexp, errbuf, 1024);
673 regfree(&p->regexp);
674 compile_regexp_failed(p, errbuf);
675 }
676 }
677
678 static struct grep_expr *compile_pattern_or(struct grep_pat **);
679 static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
680 {
681 struct grep_pat *p;
682 struct grep_expr *x;
683
684 p = *list;
685 if (!p)
686 return NULL;
687 switch (p->token) {
688 case GREP_PATTERN: /* atom */
689 case GREP_PATTERN_HEAD:
690 case GREP_PATTERN_BODY:
691 x = xcalloc(1, sizeof (struct grep_expr));
692 x->node = GREP_NODE_ATOM;
693 x->u.atom = p;
694 *list = p->next;
695 return x;
696 case GREP_OPEN_PAREN:
697 *list = p->next;
698 x = compile_pattern_or(list);
699 if (!*list || (*list)->token != GREP_CLOSE_PAREN)
700 die("unmatched parenthesis");
701 *list = (*list)->next;
702 return x;
703 default:
704 return NULL;
705 }
706 }
707
708 static struct grep_expr *compile_pattern_not(struct grep_pat **list)
709 {
710 struct grep_pat *p;
711 struct grep_expr *x;
712
713 p = *list;
714 if (!p)
715 return NULL;
716 switch (p->token) {
717 case GREP_NOT:
718 if (!p->next)
719 die("--not not followed by pattern expression");
720 *list = p->next;
721 x = xcalloc(1, sizeof (struct grep_expr));
722 x->node = GREP_NODE_NOT;
723 x->u.unary = compile_pattern_not(list);
724 if (!x->u.unary)
725 die("--not followed by non pattern expression");
726 return x;
727 default:
728 return compile_pattern_atom(list);
729 }
730 }
731
732 static struct grep_expr *compile_pattern_and(struct grep_pat **list)
733 {
734 struct grep_pat *p;
735 struct grep_expr *x, *y, *z;
736
737 x = compile_pattern_not(list);
738 p = *list;
739 if (p && p->token == GREP_AND) {
740 if (!p->next)
741 die("--and not followed by pattern expression");
742 *list = p->next;
743 y = compile_pattern_and(list);
744 if (!y)
745 die("--and not followed by pattern expression");
746 z = xcalloc(1, sizeof (struct grep_expr));
747 z->node = GREP_NODE_AND;
748 z->u.binary.left = x;
749 z->u.binary.right = y;
750 return z;
751 }
752 return x;
753 }
754
755 static struct grep_expr *compile_pattern_or(struct grep_pat **list)
756 {
757 struct grep_pat *p;
758 struct grep_expr *x, *y, *z;
759
760 x = compile_pattern_and(list);
761 p = *list;
762 if (x && p && p->token != GREP_CLOSE_PAREN) {
763 y = compile_pattern_or(list);
764 if (!y)
765 die("not a pattern expression %s", p->pattern);
766 z = xcalloc(1, sizeof (struct grep_expr));
767 z->node = GREP_NODE_OR;
768 z->u.binary.left = x;
769 z->u.binary.right = y;
770 return z;
771 }
772 return x;
773 }
774
775 static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
776 {
777 return compile_pattern_or(list);
778 }
779
780 static void indent(int in)
781 {
782 while (in-- > 0)
783 fputc(' ', stderr);
784 }
785
786 static void dump_grep_pat(struct grep_pat *p)
787 {
788 switch (p->token) {
789 case GREP_AND: fprintf(stderr, "*and*"); break;
790 case GREP_OPEN_PAREN: fprintf(stderr, "*(*"); break;
791 case GREP_CLOSE_PAREN: fprintf(stderr, "*)*"); break;
792 case GREP_NOT: fprintf(stderr, "*not*"); break;
793 case GREP_OR: fprintf(stderr, "*or*"); break;
794
795 case GREP_PATTERN: fprintf(stderr, "pattern"); break;
796 case GREP_PATTERN_HEAD: fprintf(stderr, "pattern_head"); break;
797 case GREP_PATTERN_BODY: fprintf(stderr, "pattern_body"); break;
798 }
799
800 switch (p->token) {
801 default: break;
802 case GREP_PATTERN_HEAD:
803 fprintf(stderr, "<head %d>", p->field); break;
804 case GREP_PATTERN_BODY:
805 fprintf(stderr, "<body>"); break;
806 }
807 switch (p->token) {
808 default: break;
809 case GREP_PATTERN_HEAD:
810 case GREP_PATTERN_BODY:
811 case GREP_PATTERN:
812 fprintf(stderr, "%.*s", (int)p->patternlen, p->pattern);
813 break;
814 }
815 fputc('\n', stderr);
816 }
817
818 static void dump_grep_expression_1(struct grep_expr *x, int in)
819 {
820 indent(in);
821 switch (x->node) {
822 case GREP_NODE_TRUE:
823 fprintf(stderr, "true\n");
824 break;
825 case GREP_NODE_ATOM:
826 dump_grep_pat(x->u.atom);
827 break;
828 case GREP_NODE_NOT:
829 fprintf(stderr, "(not\n");
830 dump_grep_expression_1(x->u.unary, in+1);
831 indent(in);
832 fprintf(stderr, ")\n");
833 break;
834 case GREP_NODE_AND:
835 fprintf(stderr, "(and\n");
836 dump_grep_expression_1(x->u.binary.left, in+1);
837 dump_grep_expression_1(x->u.binary.right, in+1);
838 indent(in);
839 fprintf(stderr, ")\n");
840 break;
841 case GREP_NODE_OR:
842 fprintf(stderr, "(or\n");
843 dump_grep_expression_1(x->u.binary.left, in+1);
844 dump_grep_expression_1(x->u.binary.right, in+1);
845 indent(in);
846 fprintf(stderr, ")\n");
847 break;
848 }
849 }
850
851 static void dump_grep_expression(struct grep_opt *opt)
852 {
853 struct grep_expr *x = opt->pattern_expression;
854
855 if (opt->all_match)
856 fprintf(stderr, "[all-match]\n");
857 dump_grep_expression_1(x, 0);
858 fflush(NULL);
859 }
860
861 static struct grep_expr *grep_true_expr(void)
862 {
863 struct grep_expr *z = xcalloc(1, sizeof(*z));
864 z->node = GREP_NODE_TRUE;
865 return z;
866 }
867
868 static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
869 {
870 struct grep_expr *z = xcalloc(1, sizeof(*z));
871 z->node = GREP_NODE_OR;
872 z->u.binary.left = left;
873 z->u.binary.right = right;
874 return z;
875 }
876
877 static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
878 {
879 struct grep_pat *p;
880 struct grep_expr *header_expr;
881 struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
882 enum grep_header_field fld;
883
884 if (!opt->header_list)
885 return NULL;
886
887 for (p = opt->header_list; p; p = p->next) {
888 if (p->token != GREP_PATTERN_HEAD)
889 die("BUG: a non-header pattern in grep header list.");
890 if (p->field < GREP_HEADER_FIELD_MIN ||
891 GREP_HEADER_FIELD_MAX <= p->field)
892 die("BUG: unknown header field %d", p->field);
893 compile_regexp(p, opt);
894 }
895
896 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
897 header_group[fld] = NULL;
898
899 for (p = opt->header_list; p; p = p->next) {
900 struct grep_expr *h;
901 struct grep_pat *pp = p;
902
903 h = compile_pattern_atom(&pp);
904 if (!h || pp != p->next)
905 die("BUG: malformed header expr");
906 if (!header_group[p->field]) {
907 header_group[p->field] = h;
908 continue;
909 }
910 header_group[p->field] = grep_or_expr(h, header_group[p->field]);
911 }
912
913 header_expr = NULL;
914
915 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
916 if (!header_group[fld])
917 continue;
918 if (!header_expr)
919 header_expr = grep_true_expr();
920 header_expr = grep_or_expr(header_group[fld], header_expr);
921 }
922 return header_expr;
923 }
924
925 static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
926 {
927 struct grep_expr *z = x;
928
929 while (x) {
930 assert(x->node == GREP_NODE_OR);
931 if (x->u.binary.right &&
932 x->u.binary.right->node == GREP_NODE_TRUE) {
933 x->u.binary.right = y;
934 break;
935 }
936 x = x->u.binary.right;
937 }
938 return z;
939 }
940
941 static void compile_grep_patterns_real(struct grep_opt *opt)
942 {
943 struct grep_pat *p;
944 struct grep_expr *header_expr = prep_header_patterns(opt);
945
946 for (p = opt->pattern_list; p; p = p->next) {
947 switch (p->token) {
948 case GREP_PATTERN: /* atom */
949 case GREP_PATTERN_HEAD:
950 case GREP_PATTERN_BODY:
951 compile_regexp(p, opt);
952 break;
953 default:
954 opt->extended = 1;
955 break;
956 }
957 }
958
959 if (opt->all_match || header_expr)
960 opt->extended = 1;
961 else if (!opt->extended && !opt->debug)
962 return;
963
964 p = opt->pattern_list;
965 if (p)
966 opt->pattern_expression = compile_pattern_expr(&p);
967 if (p)
968 die("incomplete pattern expression: %s", p->pattern);
969
970 if (!header_expr)
971 return;
972
973 if (!opt->pattern_expression)
974 opt->pattern_expression = header_expr;
975 else if (opt->all_match)
976 opt->pattern_expression = grep_splice_or(header_expr,
977 opt->pattern_expression);
978 else
979 opt->pattern_expression = grep_or_expr(opt->pattern_expression,
980 header_expr);
981 opt->all_match = 1;
982 }
983
984 void compile_grep_patterns(struct grep_opt *opt)
985 {
986 compile_grep_patterns_real(opt);
987 if (opt->debug)
988 dump_grep_expression(opt);
989 }
990
991 static void free_pattern_expr(struct grep_expr *x)
992 {
993 switch (x->node) {
994 case GREP_NODE_TRUE:
995 case GREP_NODE_ATOM:
996 break;
997 case GREP_NODE_NOT:
998 free_pattern_expr(x->u.unary);
999 break;
1000 case GREP_NODE_AND:
1001 case GREP_NODE_OR:
1002 free_pattern_expr(x->u.binary.left);
1003 free_pattern_expr(x->u.binary.right);
1004 break;
1005 }
1006 free(x);
1007 }
1008
1009 void free_grep_patterns(struct grep_opt *opt)
1010 {
1011 struct grep_pat *p, *n;
1012
1013 for (p = opt->pattern_list; p; p = n) {
1014 n = p->next;
1015 switch (p->token) {
1016 case GREP_PATTERN: /* atom */
1017 case GREP_PATTERN_HEAD:
1018 case GREP_PATTERN_BODY:
1019 if (p->kws)
1020 kwsfree(p->kws);
1021 else if (p->pcre1_regexp)
1022 free_pcre1_regexp(p);
1023 else if (p->pcre2_pattern)
1024 free_pcre2_pattern(p);
1025 else
1026 regfree(&p->regexp);
1027 free(p->pattern);
1028 break;
1029 default:
1030 break;
1031 }
1032 free(p);
1033 }
1034
1035 if (!opt->extended)
1036 return;
1037 free_pattern_expr(opt->pattern_expression);
1038 }
1039
1040 static char *end_of_line(char *cp, unsigned long *left)
1041 {
1042 unsigned long l = *left;
1043 while (l && *cp != '\n') {
1044 l--;
1045 cp++;
1046 }
1047 *left = l;
1048 return cp;
1049 }
1050
1051 static int word_char(char ch)
1052 {
1053 return isalnum(ch) || ch == '_';
1054 }
1055
1056 static void output_color(struct grep_opt *opt, const void *data, size_t size,
1057 const char *color)
1058 {
1059 if (want_color(opt->color) && color && color[0]) {
1060 opt->output(opt, color, strlen(color));
1061 opt->output(opt, data, size);
1062 opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
1063 } else
1064 opt->output(opt, data, size);
1065 }
1066
1067 static void output_sep(struct grep_opt *opt, char sign)
1068 {
1069 if (opt->null_following_name)
1070 opt->output(opt, "\0", 1);
1071 else
1072 output_color(opt, &sign, 1, opt->color_sep);
1073 }
1074
1075 static void show_name(struct grep_opt *opt, const char *name)
1076 {
1077 output_color(opt, name, strlen(name), opt->color_filename);
1078 opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
1079 }
1080
1081 static int fixmatch(struct grep_pat *p, char *line, char *eol,
1082 regmatch_t *match)
1083 {
1084 struct kwsmatch kwsm;
1085 size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
1086 if (offset == -1) {
1087 match->rm_so = match->rm_eo = -1;
1088 return REG_NOMATCH;
1089 } else {
1090 match->rm_so = offset;
1091 match->rm_eo = match->rm_so + kwsm.size[0];
1092 return 0;
1093 }
1094 }
1095
1096 static int patmatch(struct grep_pat *p, char *line, char *eol,
1097 regmatch_t *match, int eflags)
1098 {
1099 int hit;
1100
1101 if (p->fixed)
1102 hit = !fixmatch(p, line, eol, match);
1103 else if (p->pcre1_regexp)
1104 hit = !pcre1match(p, line, eol, match, eflags);
1105 else if (p->pcre2_pattern)
1106 hit = !pcre2match(p, line, eol, match, eflags);
1107 else
1108 hit = !regexec_buf(&p->regexp, line, eol - line, 1, match,
1109 eflags);
1110
1111 return hit;
1112 }
1113
1114 static int strip_timestamp(char *bol, char **eol_p)
1115 {
1116 char *eol = *eol_p;
1117 int ch;
1118
1119 while (bol < --eol) {
1120 if (*eol != '>')
1121 continue;
1122 *eol_p = ++eol;
1123 ch = *eol;
1124 *eol = '\0';
1125 return ch;
1126 }
1127 return 0;
1128 }
1129
1130 static struct {
1131 const char *field;
1132 size_t len;
1133 } header_field[] = {
1134 { "author ", 7 },
1135 { "committer ", 10 },
1136 { "reflog ", 7 },
1137 };
1138
1139 static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
1140 enum grep_context ctx,
1141 regmatch_t *pmatch, int eflags)
1142 {
1143 int hit = 0;
1144 int saved_ch = 0;
1145 const char *start = bol;
1146
1147 if ((p->token != GREP_PATTERN) &&
1148 ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
1149 return 0;
1150
1151 if (p->token == GREP_PATTERN_HEAD) {
1152 const char *field;
1153 size_t len;
1154 assert(p->field < ARRAY_SIZE(header_field));
1155 field = header_field[p->field].field;
1156 len = header_field[p->field].len;
1157 if (strncmp(bol, field, len))
1158 return 0;
1159 bol += len;
1160 switch (p->field) {
1161 case GREP_HEADER_AUTHOR:
1162 case GREP_HEADER_COMMITTER:
1163 saved_ch = strip_timestamp(bol, &eol);
1164 break;
1165 default:
1166 break;
1167 }
1168 }
1169
1170 again:
1171 hit = patmatch(p, bol, eol, pmatch, eflags);
1172
1173 if (hit && p->word_regexp) {
1174 if ((pmatch[0].rm_so < 0) ||
1175 (eol - bol) < pmatch[0].rm_so ||
1176 (pmatch[0].rm_eo < 0) ||
1177 (eol - bol) < pmatch[0].rm_eo)
1178 die("regexp returned nonsense");
1179
1180 /* Match beginning must be either beginning of the
1181 * line, or at word boundary (i.e. the last char must
1182 * not be a word char). Similarly, match end must be
1183 * either end of the line, or at word boundary
1184 * (i.e. the next char must not be a word char).
1185 */
1186 if ( ((pmatch[0].rm_so == 0) ||
1187 !word_char(bol[pmatch[0].rm_so-1])) &&
1188 ((pmatch[0].rm_eo == (eol-bol)) ||
1189 !word_char(bol[pmatch[0].rm_eo])) )
1190 ;
1191 else
1192 hit = 0;
1193
1194 /* Words consist of at least one character. */
1195 if (pmatch->rm_so == pmatch->rm_eo)
1196 hit = 0;
1197
1198 if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
1199 /* There could be more than one match on the
1200 * line, and the first match might not be
1201 * strict word match. But later ones could be!
1202 * Forward to the next possible start, i.e. the
1203 * next position following a non-word char.
1204 */
1205 bol = pmatch[0].rm_so + bol + 1;
1206 while (word_char(bol[-1]) && bol < eol)
1207 bol++;
1208 eflags |= REG_NOTBOL;
1209 if (bol < eol)
1210 goto again;
1211 }
1212 }
1213 if (p->token == GREP_PATTERN_HEAD && saved_ch)
1214 *eol = saved_ch;
1215 if (hit) {
1216 pmatch[0].rm_so += bol - start;
1217 pmatch[0].rm_eo += bol - start;
1218 }
1219 return hit;
1220 }
1221
1222 static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
1223 enum grep_context ctx, int collect_hits)
1224 {
1225 int h = 0;
1226 regmatch_t match;
1227
1228 if (!x)
1229 die("Not a valid grep expression");
1230 switch (x->node) {
1231 case GREP_NODE_TRUE:
1232 h = 1;
1233 break;
1234 case GREP_NODE_ATOM:
1235 h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
1236 break;
1237 case GREP_NODE_NOT:
1238 h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
1239 break;
1240 case GREP_NODE_AND:
1241 if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
1242 return 0;
1243 h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
1244 break;
1245 case GREP_NODE_OR:
1246 if (!collect_hits)
1247 return (match_expr_eval(x->u.binary.left,
1248 bol, eol, ctx, 0) ||
1249 match_expr_eval(x->u.binary.right,
1250 bol, eol, ctx, 0));
1251 h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
1252 x->u.binary.left->hit |= h;
1253 h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
1254 break;
1255 default:
1256 die("Unexpected node type (internal error) %d", x->node);
1257 }
1258 if (collect_hits)
1259 x->hit |= h;
1260 return h;
1261 }
1262
1263 static int match_expr(struct grep_opt *opt, char *bol, char *eol,
1264 enum grep_context ctx, int collect_hits)
1265 {
1266 struct grep_expr *x = opt->pattern_expression;
1267 return match_expr_eval(x, bol, eol, ctx, collect_hits);
1268 }
1269
1270 static int match_line(struct grep_opt *opt, char *bol, char *eol,
1271 enum grep_context ctx, int collect_hits)
1272 {
1273 struct grep_pat *p;
1274 regmatch_t match;
1275
1276 if (opt->extended)
1277 return match_expr(opt, bol, eol, ctx, collect_hits);
1278
1279 /* we do not call with collect_hits without being extended */
1280 for (p = opt->pattern_list; p; p = p->next) {
1281 if (match_one_pattern(p, bol, eol, ctx, &match, 0))
1282 return 1;
1283 }
1284 return 0;
1285 }
1286
1287 static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
1288 enum grep_context ctx,
1289 regmatch_t *pmatch, int eflags)
1290 {
1291 regmatch_t match;
1292
1293 if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
1294 return 0;
1295 if (match.rm_so < 0 || match.rm_eo < 0)
1296 return 0;
1297 if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
1298 if (match.rm_so > pmatch->rm_so)
1299 return 1;
1300 if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
1301 return 1;
1302 }
1303 pmatch->rm_so = match.rm_so;
1304 pmatch->rm_eo = match.rm_eo;
1305 return 1;
1306 }
1307
1308 static int next_match(struct grep_opt *opt, char *bol, char *eol,
1309 enum grep_context ctx, regmatch_t *pmatch, int eflags)
1310 {
1311 struct grep_pat *p;
1312 int hit = 0;
1313
1314 pmatch->rm_so = pmatch->rm_eo = -1;
1315 if (bol < eol) {
1316 for (p = opt->pattern_list; p; p = p->next) {
1317 switch (p->token) {
1318 case GREP_PATTERN: /* atom */
1319 case GREP_PATTERN_HEAD:
1320 case GREP_PATTERN_BODY:
1321 hit |= match_next_pattern(p, bol, eol, ctx,
1322 pmatch, eflags);
1323 break;
1324 default:
1325 break;
1326 }
1327 }
1328 }
1329 return hit;
1330 }
1331
1332 static void show_line(struct grep_opt *opt, char *bol, char *eol,
1333 const char *name, unsigned lno, char sign)
1334 {
1335 int rest = eol - bol;
1336 const char *match_color, *line_color = NULL;
1337
1338 if (opt->file_break && opt->last_shown == 0) {
1339 if (opt->show_hunk_mark)
1340 opt->output(opt, "\n", 1);
1341 } else if (opt->pre_context || opt->post_context || opt->funcbody) {
1342 if (opt->last_shown == 0) {
1343 if (opt->show_hunk_mark) {
1344 output_color(opt, "--", 2, opt->color_sep);
1345 opt->output(opt, "\n", 1);
1346 }
1347 } else if (lno > opt->last_shown + 1) {
1348 output_color(opt, "--", 2, opt->color_sep);
1349 opt->output(opt, "\n", 1);
1350 }
1351 }
1352 if (opt->heading && opt->last_shown == 0) {
1353 output_color(opt, name, strlen(name), opt->color_filename);
1354 opt->output(opt, "\n", 1);
1355 }
1356 opt->last_shown = lno;
1357
1358 if (!opt->heading && opt->pathname) {
1359 output_color(opt, name, strlen(name), opt->color_filename);
1360 output_sep(opt, sign);
1361 }
1362 if (opt->linenum) {
1363 char buf[32];
1364 xsnprintf(buf, sizeof(buf), "%d", lno);
1365 output_color(opt, buf, strlen(buf), opt->color_lineno);
1366 output_sep(opt, sign);
1367 }
1368 if (opt->color) {
1369 regmatch_t match;
1370 enum grep_context ctx = GREP_CONTEXT_BODY;
1371 int ch = *eol;
1372 int eflags = 0;
1373
1374 if (sign == ':')
1375 match_color = opt->color_match_selected;
1376 else
1377 match_color = opt->color_match_context;
1378 if (sign == ':')
1379 line_color = opt->color_selected;
1380 else if (sign == '-')
1381 line_color = opt->color_context;
1382 else if (sign == '=')
1383 line_color = opt->color_function;
1384 *eol = '\0';
1385 while (next_match(opt, bol, eol, ctx, &match, eflags)) {
1386 if (match.rm_so == match.rm_eo)
1387 break;
1388
1389 output_color(opt, bol, match.rm_so, line_color);
1390 output_color(opt, bol + match.rm_so,
1391 match.rm_eo - match.rm_so, match_color);
1392 bol += match.rm_eo;
1393 rest -= match.rm_eo;
1394 eflags = REG_NOTBOL;
1395 }
1396 *eol = ch;
1397 }
1398 output_color(opt, bol, rest, line_color);
1399 opt->output(opt, "\n", 1);
1400 }
1401
1402 #ifndef NO_PTHREADS
1403 int grep_use_locks;
1404
1405 /*
1406 * This lock protects access to the gitattributes machinery, which is
1407 * not thread-safe.
1408 */
1409 pthread_mutex_t grep_attr_mutex;
1410
1411 static inline void grep_attr_lock(void)
1412 {
1413 if (grep_use_locks)
1414 pthread_mutex_lock(&grep_attr_mutex);
1415 }
1416
1417 static inline void grep_attr_unlock(void)
1418 {
1419 if (grep_use_locks)
1420 pthread_mutex_unlock(&grep_attr_mutex);
1421 }
1422
1423 /*
1424 * Same as git_attr_mutex, but protecting the thread-unsafe object db access.
1425 */
1426 pthread_mutex_t grep_read_mutex;
1427
1428 #else
1429 #define grep_attr_lock()
1430 #define grep_attr_unlock()
1431 #endif
1432
1433 static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
1434 {
1435 xdemitconf_t *xecfg = opt->priv;
1436 if (xecfg && !xecfg->find_func) {
1437 grep_source_load_driver(gs);
1438 if (gs->driver->funcname.pattern) {
1439 const struct userdiff_funcname *pe = &gs->driver->funcname;
1440 xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
1441 } else {
1442 xecfg = opt->priv = NULL;
1443 }
1444 }
1445
1446 if (xecfg) {
1447 char buf[1];
1448 return xecfg->find_func(bol, eol - bol, buf, 1,
1449 xecfg->find_func_priv) >= 0;
1450 }
1451
1452 if (bol == eol)
1453 return 0;
1454 if (isalpha(*bol) || *bol == '_' || *bol == '$')
1455 return 1;
1456 return 0;
1457 }
1458
1459 static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
1460 char *bol, unsigned lno)
1461 {
1462 while (bol > gs->buf) {
1463 char *eol = --bol;
1464
1465 while (bol > gs->buf && bol[-1] != '\n')
1466 bol--;
1467 lno--;
1468
1469 if (lno <= opt->last_shown)
1470 break;
1471
1472 if (match_funcname(opt, gs, bol, eol)) {
1473 show_line(opt, bol, eol, gs->name, lno, '=');
1474 break;
1475 }
1476 }
1477 }
1478
1479 static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
1480 char *bol, char *end, unsigned lno)
1481 {
1482 unsigned cur = lno, from = 1, funcname_lno = 0;
1483 int funcname_needed = !!opt->funcname;
1484
1485 if (opt->funcbody && !match_funcname(opt, gs, bol, end))
1486 funcname_needed = 2;
1487
1488 if (opt->pre_context < lno)
1489 from = lno - opt->pre_context;
1490 if (from <= opt->last_shown)
1491 from = opt->last_shown + 1;
1492
1493 /* Rewind. */
1494 while (bol > gs->buf &&
1495 cur > (funcname_needed == 2 ? opt->last_shown + 1 : from)) {
1496 char *eol = --bol;
1497
1498 while (bol > gs->buf && bol[-1] != '\n')
1499 bol--;
1500 cur--;
1501 if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
1502 funcname_lno = cur;
1503 funcname_needed = 0;
1504 }
1505 }
1506
1507 /* We need to look even further back to find a function signature. */
1508 if (opt->funcname && funcname_needed)
1509 show_funcname_line(opt, gs, bol, cur);
1510
1511 /* Back forward. */
1512 while (cur < lno) {
1513 char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
1514
1515 while (*eol != '\n')
1516 eol++;
1517 show_line(opt, bol, eol, gs->name, cur, sign);
1518 bol = eol + 1;
1519 cur++;
1520 }
1521 }
1522
1523 static int should_lookahead(struct grep_opt *opt)
1524 {
1525 struct grep_pat *p;
1526
1527 if (opt->extended)
1528 return 0; /* punt for too complex stuff */
1529 if (opt->invert)
1530 return 0;
1531 for (p = opt->pattern_list; p; p = p->next) {
1532 if (p->token != GREP_PATTERN)
1533 return 0; /* punt for "header only" and stuff */
1534 }
1535 return 1;
1536 }
1537
1538 static int look_ahead(struct grep_opt *opt,
1539 unsigned long *left_p,
1540 unsigned *lno_p,
1541 char **bol_p)
1542 {
1543 unsigned lno = *lno_p;
1544 char *bol = *bol_p;
1545 struct grep_pat *p;
1546 char *sp, *last_bol;
1547 regoff_t earliest = -1;
1548
1549 for (p = opt->pattern_list; p; p = p->next) {
1550 int hit;
1551 regmatch_t m;
1552
1553 hit = patmatch(p, bol, bol + *left_p, &m, 0);
1554 if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1555 continue;
1556 if (earliest < 0 || m.rm_so < earliest)
1557 earliest = m.rm_so;
1558 }
1559
1560 if (earliest < 0) {
1561 *bol_p = bol + *left_p;
1562 *left_p = 0;
1563 return 1;
1564 }
1565 for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1566 ; /* find the beginning of the line */
1567 last_bol = sp;
1568
1569 for (sp = bol; sp < last_bol; sp++) {
1570 if (*sp == '\n')
1571 lno++;
1572 }
1573 *left_p -= last_bol - bol;
1574 *bol_p = last_bol;
1575 *lno_p = lno;
1576 return 0;
1577 }
1578
1579 static int fill_textconv_grep(struct userdiff_driver *driver,
1580 struct grep_source *gs)
1581 {
1582 struct diff_filespec *df;
1583 char *buf;
1584 size_t size;
1585
1586 if (!driver || !driver->textconv)
1587 return grep_source_load(gs);
1588
1589 /*
1590 * The textconv interface is intimately tied to diff_filespecs, so we
1591 * have to pretend to be one. If we could unify the grep_source
1592 * and diff_filespec structs, this mess could just go away.
1593 */
1594 df = alloc_filespec(gs->path);
1595 switch (gs->type) {
1596 case GREP_SOURCE_OID:
1597 fill_filespec(df, gs->identifier, 1, 0100644);
1598 break;
1599 case GREP_SOURCE_FILE:
1600 fill_filespec(df, &null_oid, 0, 0100644);
1601 break;
1602 default:
1603 die("BUG: attempt to textconv something without a path?");
1604 }
1605
1606 /*
1607 * fill_textconv is not remotely thread-safe; it may load objects
1608 * behind the scenes, and it modifies the global diff tempfile
1609 * structure.
1610 */
1611 grep_read_lock();
1612 size = fill_textconv(driver, df, &buf);
1613 grep_read_unlock();
1614 free_filespec(df);
1615
1616 /*
1617 * The normal fill_textconv usage by the diff machinery would just keep
1618 * the textconv'd buf separate from the diff_filespec. But much of the
1619 * grep code passes around a grep_source and assumes that its "buf"
1620 * pointer is the beginning of the thing we are searching. So let's
1621 * install our textconv'd version into the grep_source, taking care not
1622 * to leak any existing buffer.
1623 */
1624 grep_source_clear_data(gs);
1625 gs->buf = buf;
1626 gs->size = size;
1627
1628 return 0;
1629 }
1630
1631 static int is_empty_line(const char *bol, const char *eol)
1632 {
1633 while (bol < eol && isspace(*bol))
1634 bol++;
1635 return bol == eol;
1636 }
1637
1638 static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
1639 {
1640 char *bol;
1641 char *peek_bol = NULL;
1642 unsigned long left;
1643 unsigned lno = 1;
1644 unsigned last_hit = 0;
1645 int binary_match_only = 0;
1646 unsigned count = 0;
1647 int try_lookahead = 0;
1648 int show_function = 0;
1649 struct userdiff_driver *textconv = NULL;
1650 enum grep_context ctx = GREP_CONTEXT_HEAD;
1651 xdemitconf_t xecfg;
1652
1653 if (!opt->output)
1654 opt->output = std_output;
1655
1656 if (opt->pre_context || opt->post_context || opt->file_break ||
1657 opt->funcbody) {
1658 /* Show hunk marks, except for the first file. */
1659 if (opt->last_shown)
1660 opt->show_hunk_mark = 1;
1661 /*
1662 * If we're using threads then we can't easily identify
1663 * the first file. Always put hunk marks in that case
1664 * and skip the very first one later in work_done().
1665 */
1666 if (opt->output != std_output)
1667 opt->show_hunk_mark = 1;
1668 }
1669 opt->last_shown = 0;
1670
1671 if (opt->allow_textconv) {
1672 grep_source_load_driver(gs);
1673 /*
1674 * We might set up the shared textconv cache data here, which
1675 * is not thread-safe.
1676 */
1677 grep_attr_lock();
1678 textconv = userdiff_get_textconv(gs->driver);
1679 grep_attr_unlock();
1680 }
1681
1682 /*
1683 * We know the result of a textconv is text, so we only have to care
1684 * about binary handling if we are not using it.
1685 */
1686 if (!textconv) {
1687 switch (opt->binary) {
1688 case GREP_BINARY_DEFAULT:
1689 if (grep_source_is_binary(gs))
1690 binary_match_only = 1;
1691 break;
1692 case GREP_BINARY_NOMATCH:
1693 if (grep_source_is_binary(gs))
1694 return 0; /* Assume unmatch */
1695 break;
1696 case GREP_BINARY_TEXT:
1697 break;
1698 default:
1699 die("BUG: unknown binary handling mode");
1700 }
1701 }
1702
1703 memset(&xecfg, 0, sizeof(xecfg));
1704 opt->priv = &xecfg;
1705
1706 try_lookahead = should_lookahead(opt);
1707
1708 if (fill_textconv_grep(textconv, gs) < 0)
1709 return 0;
1710
1711 bol = gs->buf;
1712 left = gs->size;
1713 while (left) {
1714 char *eol, ch;
1715 int hit;
1716
1717 /*
1718 * look_ahead() skips quickly to the line that possibly
1719 * has the next hit; don't call it if we need to do
1720 * something more than just skipping the current line
1721 * in response to an unmatch for the current line. E.g.
1722 * inside a post-context window, we will show the current
1723 * line as a context around the previous hit when it
1724 * doesn't hit.
1725 */
1726 if (try_lookahead
1727 && !(last_hit
1728 && (show_function ||
1729 lno <= last_hit + opt->post_context))
1730 && look_ahead(opt, &left, &lno, &bol))
1731 break;
1732 eol = end_of_line(bol, &left);
1733 ch = *eol;
1734 *eol = 0;
1735
1736 if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1737 ctx = GREP_CONTEXT_BODY;
1738
1739 hit = match_line(opt, bol, eol, ctx, collect_hits);
1740 *eol = ch;
1741
1742 if (collect_hits)
1743 goto next_line;
1744
1745 /* "grep -v -e foo -e bla" should list lines
1746 * that do not have either, so inversion should
1747 * be done outside.
1748 */
1749 if (opt->invert)
1750 hit = !hit;
1751 if (opt->unmatch_name_only) {
1752 if (hit)
1753 return 0;
1754 goto next_line;
1755 }
1756 if (hit) {
1757 count++;
1758 if (opt->status_only)
1759 return 1;
1760 if (opt->name_only) {
1761 show_name(opt, gs->name);
1762 return 1;
1763 }
1764 if (opt->count)
1765 goto next_line;
1766 if (binary_match_only) {
1767 opt->output(opt, "Binary file ", 12);
1768 output_color(opt, gs->name, strlen(gs->name),
1769 opt->color_filename);
1770 opt->output(opt, " matches\n", 9);
1771 return 1;
1772 }
1773 /* Hit at this line. If we haven't shown the
1774 * pre-context lines, we would need to show them.
1775 */
1776 if (opt->pre_context || opt->funcbody)
1777 show_pre_context(opt, gs, bol, eol, lno);
1778 else if (opt->funcname)
1779 show_funcname_line(opt, gs, bol, lno);
1780 show_line(opt, bol, eol, gs->name, lno, ':');
1781 last_hit = lno;
1782 if (opt->funcbody)
1783 show_function = 1;
1784 goto next_line;
1785 }
1786 if (show_function && (!peek_bol || peek_bol < bol)) {
1787 unsigned long peek_left = left;
1788 char *peek_eol = eol;
1789
1790 /*
1791 * Trailing empty lines are not interesting.
1792 * Peek past them to see if they belong to the
1793 * body of the current function.
1794 */
1795 peek_bol = bol;
1796 while (is_empty_line(peek_bol, peek_eol)) {
1797 peek_bol = peek_eol + 1;
1798 peek_eol = end_of_line(peek_bol, &peek_left);
1799 }
1800
1801 if (match_funcname(opt, gs, peek_bol, peek_eol))
1802 show_function = 0;
1803 }
1804 if (show_function ||
1805 (last_hit && lno <= last_hit + opt->post_context)) {
1806 /* If the last hit is within the post context,
1807 * we need to show this line.
1808 */
1809 show_line(opt, bol, eol, gs->name, lno, '-');
1810 }
1811
1812 next_line:
1813 bol = eol + 1;
1814 if (!left)
1815 break;
1816 left--;
1817 lno++;
1818 }
1819
1820 if (collect_hits)
1821 return 0;
1822
1823 if (opt->status_only)
1824 return opt->unmatch_name_only;
1825 if (opt->unmatch_name_only) {
1826 /* We did not see any hit, so we want to show this */
1827 show_name(opt, gs->name);
1828 return 1;
1829 }
1830
1831 xdiff_clear_find_func(&xecfg);
1832 opt->priv = NULL;
1833
1834 /* NEEDSWORK:
1835 * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1836 * which feels mostly useless but sometimes useful. Maybe
1837 * make it another option? For now suppress them.
1838 */
1839 if (opt->count && count) {
1840 char buf[32];
1841 if (opt->pathname) {
1842 output_color(opt, gs->name, strlen(gs->name),
1843 opt->color_filename);
1844 output_sep(opt, ':');
1845 }
1846 xsnprintf(buf, sizeof(buf), "%u\n", count);
1847 opt->output(opt, buf, strlen(buf));
1848 return 1;
1849 }
1850 return !!last_hit;
1851 }
1852
1853 static void clr_hit_marker(struct grep_expr *x)
1854 {
1855 /* All-hit markers are meaningful only at the very top level
1856 * OR node.
1857 */
1858 while (1) {
1859 x->hit = 0;
1860 if (x->node != GREP_NODE_OR)
1861 return;
1862 x->u.binary.left->hit = 0;
1863 x = x->u.binary.right;
1864 }
1865 }
1866
1867 static int chk_hit_marker(struct grep_expr *x)
1868 {
1869 /* Top level nodes have hit markers. See if they all are hits */
1870 while (1) {
1871 if (x->node != GREP_NODE_OR)
1872 return x->hit;
1873 if (!x->u.binary.left->hit)
1874 return 0;
1875 x = x->u.binary.right;
1876 }
1877 }
1878
1879 int grep_source(struct grep_opt *opt, struct grep_source *gs)
1880 {
1881 /*
1882 * we do not have to do the two-pass grep when we do not check
1883 * buffer-wide "all-match".
1884 */
1885 if (!opt->all_match)
1886 return grep_source_1(opt, gs, 0);
1887
1888 /* Otherwise the toplevel "or" terms hit a bit differently.
1889 * We first clear hit markers from them.
1890 */
1891 clr_hit_marker(opt->pattern_expression);
1892 grep_source_1(opt, gs, 1);
1893
1894 if (!chk_hit_marker(opt->pattern_expression))
1895 return 0;
1896
1897 return grep_source_1(opt, gs, 0);
1898 }
1899
1900 int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
1901 {
1902 struct grep_source gs;
1903 int r;
1904
1905 grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL, NULL);
1906 gs.buf = buf;
1907 gs.size = size;
1908
1909 r = grep_source(opt, &gs);
1910
1911 grep_source_clear(&gs);
1912 return r;
1913 }
1914
1915 void grep_source_init(struct grep_source *gs, enum grep_source_type type,
1916 const char *name, const char *path,
1917 const void *identifier)
1918 {
1919 gs->type = type;
1920 gs->name = xstrdup_or_null(name);
1921 gs->path = xstrdup_or_null(path);
1922 gs->buf = NULL;
1923 gs->size = 0;
1924 gs->driver = NULL;
1925
1926 switch (type) {
1927 case GREP_SOURCE_FILE:
1928 gs->identifier = xstrdup(identifier);
1929 break;
1930 case GREP_SOURCE_OID:
1931 gs->identifier = oiddup(identifier);
1932 break;
1933 case GREP_SOURCE_BUF:
1934 gs->identifier = NULL;
1935 break;
1936 }
1937 }
1938
1939 void grep_source_clear(struct grep_source *gs)
1940 {
1941 FREE_AND_NULL(gs->name);
1942 FREE_AND_NULL(gs->path);
1943 FREE_AND_NULL(gs->identifier);
1944 grep_source_clear_data(gs);
1945 }
1946
1947 void grep_source_clear_data(struct grep_source *gs)
1948 {
1949 switch (gs->type) {
1950 case GREP_SOURCE_FILE:
1951 case GREP_SOURCE_OID:
1952 FREE_AND_NULL(gs->buf);
1953 gs->size = 0;
1954 break;
1955 case GREP_SOURCE_BUF:
1956 /* leave user-provided buf intact */
1957 break;
1958 }
1959 }
1960
1961 static int grep_source_load_oid(struct grep_source *gs)
1962 {
1963 enum object_type type;
1964
1965 grep_read_lock();
1966 gs->buf = read_sha1_file(gs->identifier, &type, &gs->size);
1967 grep_read_unlock();
1968
1969 if (!gs->buf)
1970 return error(_("'%s': unable to read %s"),
1971 gs->name,
1972 oid_to_hex(gs->identifier));
1973 return 0;
1974 }
1975
1976 static int grep_source_load_file(struct grep_source *gs)
1977 {
1978 const char *filename = gs->identifier;
1979 struct stat st;
1980 char *data;
1981 size_t size;
1982 int i;
1983
1984 if (lstat(filename, &st) < 0) {
1985 err_ret:
1986 if (errno != ENOENT)
1987 error_errno(_("failed to stat '%s'"), filename);
1988 return -1;
1989 }
1990 if (!S_ISREG(st.st_mode))
1991 return -1;
1992 size = xsize_t(st.st_size);
1993 i = open(filename, O_RDONLY);
1994 if (i < 0)
1995 goto err_ret;
1996 data = xmallocz(size);
1997 if (st.st_size != read_in_full(i, data, size)) {
1998 error_errno(_("'%s': short read"), filename);
1999 close(i);
2000 free(data);
2001 return -1;
2002 }
2003 close(i);
2004
2005 gs->buf = data;
2006 gs->size = size;
2007 return 0;
2008 }
2009
2010 static int grep_source_load(struct grep_source *gs)
2011 {
2012 if (gs->buf)
2013 return 0;
2014
2015 switch (gs->type) {
2016 case GREP_SOURCE_FILE:
2017 return grep_source_load_file(gs);
2018 case GREP_SOURCE_OID:
2019 return grep_source_load_oid(gs);
2020 case GREP_SOURCE_BUF:
2021 return gs->buf ? 0 : -1;
2022 }
2023 die("BUG: invalid grep_source type to load");
2024 }
2025
2026 void grep_source_load_driver(struct grep_source *gs)
2027 {
2028 if (gs->driver)
2029 return;
2030
2031 grep_attr_lock();
2032 if (gs->path)
2033 gs->driver = userdiff_find_by_path(gs->path);
2034 if (!gs->driver)
2035 gs->driver = userdiff_find_by_name("default");
2036 grep_attr_unlock();
2037 }
2038
2039 static int grep_source_is_binary(struct grep_source *gs)
2040 {
2041 grep_source_load_driver(gs);
2042 if (gs->driver->binary != -1)
2043 return gs->driver->binary;
2044
2045 if (!grep_source_load(gs))
2046 return buffer_is_binary(gs->buf, gs->size);
2047
2048 return 0;
2049 }
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