1#include "cache.h"
2#include "config.h"
3#include "grep.h"
4#include "object-store.h"
5#include "userdiff.h"
6#include "xdiff-interface.h"
7#include "diff.h"
8#include "diffcore.h"
9#include "commit.h"
10#include "quote.h"
11static int grep_source_load(struct grep_source *gs);
13static int grep_source_is_binary(struct grep_source *gs);
14static struct grep_opt grep_defaults;
16static void std_output(struct grep_opt *opt, const void *buf, size_t size)
18{
19 fwrite(buf, size, 1, stdout);
20}
21static void color_set(char *dst, const char *color_bytes)
23{
24 xsnprintf(dst, COLOR_MAXLEN, "%s", color_bytes);
25}
26/*
28 * Initialize the grep_defaults template with hardcoded defaults.
29 * We could let the compiler do this, but without C99 initializers
30 * the code gets unwieldy and unreadable, so...
31 */
32void init_grep_defaults(void)
33{
34 struct grep_opt *opt = &grep_defaults;
35 static int run_once;
36 if (run_once)
38 return;
39 run_once++;
40 memset(opt, 0, sizeof(*opt));
42 opt->relative = 1;
43 opt->pathname = 1;
44 opt->max_depth = -1;
45 opt->pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
46 color_set(opt->color_context, "");
47 color_set(opt->color_filename, "");
48 color_set(opt->color_function, "");
49 color_set(opt->color_lineno, "");
50 color_set(opt->color_match_context, GIT_COLOR_BOLD_RED);
51 color_set(opt->color_match_selected, GIT_COLOR_BOLD_RED);
52 color_set(opt->color_selected, "");
53 color_set(opt->color_sep, GIT_COLOR_CYAN);
54 opt->color = -1;
55 opt->output = std_output;
56}
57static int parse_pattern_type_arg(const char *opt, const char *arg)
59{
60 if (!strcmp(arg, "default"))
61 return GREP_PATTERN_TYPE_UNSPECIFIED;
62 else if (!strcmp(arg, "basic"))
63 return GREP_PATTERN_TYPE_BRE;
64 else if (!strcmp(arg, "extended"))
65 return GREP_PATTERN_TYPE_ERE;
66 else if (!strcmp(arg, "fixed"))
67 return GREP_PATTERN_TYPE_FIXED;
68 else if (!strcmp(arg, "perl"))
69 return GREP_PATTERN_TYPE_PCRE;
70 die("bad %s argument: %s", opt, arg);
71}
72/*
74 * Read the configuration file once and store it in
75 * the grep_defaults template.
76 */
77int grep_config(const char *var, const char *value, void *cb)
78{
79 struct grep_opt *opt = &grep_defaults;
80 char *color = NULL;
81 if (userdiff_config(var, value) < 0)
83 return -1;
84 if (!strcmp(var, "grep.extendedregexp")) {
86 opt->extended_regexp_option = git_config_bool(var, value);
87 return 0;
88 }
89 if (!strcmp(var, "grep.patterntype")) {
91 opt->pattern_type_option = parse_pattern_type_arg(var, value);
92 return 0;
93 }
94 if (!strcmp(var, "grep.linenumber")) {
96 opt->linenum = git_config_bool(var, value);
97 return 0;
98 }
99 if (!strcmp(var, "grep.fullname")) {
101 opt->relative = !git_config_bool(var, value);
102 return 0;
103 }
104 if (!strcmp(var, "color.grep"))
106 opt->color = git_config_colorbool(var, value);
107 else if (!strcmp(var, "color.grep.context"))
108 color = opt->color_context;
109 else if (!strcmp(var, "color.grep.filename"))
110 color = opt->color_filename;
111 else if (!strcmp(var, "color.grep.function"))
112 color = opt->color_function;
113 else if (!strcmp(var, "color.grep.linenumber"))
114 color = opt->color_lineno;
115 else if (!strcmp(var, "color.grep.matchcontext"))
116 color = opt->color_match_context;
117 else if (!strcmp(var, "color.grep.matchselected"))
118 color = opt->color_match_selected;
119 else if (!strcmp(var, "color.grep.selected"))
120 color = opt->color_selected;
121 else if (!strcmp(var, "color.grep.separator"))
122 color = opt->color_sep;
123 else if (!strcmp(var, "color.grep.match")) {
124 int rc = 0;
125 if (!value)
126 return config_error_nonbool(var);
127 rc |= color_parse(value, opt->color_match_context);
128 rc |= color_parse(value, opt->color_match_selected);
129 return rc;
130 }
131 if (color) {
133 if (!value)
134 return config_error_nonbool(var);
135 return color_parse(value, color);
136 }
137 return 0;
138}
139/*
141 * Initialize one instance of grep_opt and copy the
142 * default values from the template we read the configuration
143 * information in an earlier call to git_config(grep_config).
144 */
145void grep_init(struct grep_opt *opt, const char *prefix)
146{
147 struct grep_opt *def = &grep_defaults;
148 memset(opt, 0, sizeof(*opt));
150 opt->prefix = prefix;
151 opt->prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
152 opt->pattern_tail = &opt->pattern_list;
153 opt->header_tail = &opt->header_list;
154 opt->color = def->color;
156 opt->extended_regexp_option = def->extended_regexp_option;
157 opt->pattern_type_option = def->pattern_type_option;
158 opt->linenum = def->linenum;
159 opt->max_depth = def->max_depth;
160 opt->pathname = def->pathname;
161 opt->relative = def->relative;
162 opt->output = def->output;
163 color_set(opt->color_context, def->color_context);
165 color_set(opt->color_filename, def->color_filename);
166 color_set(opt->color_function, def->color_function);
167 color_set(opt->color_lineno, def->color_lineno);
168 color_set(opt->color_match_context, def->color_match_context);
169 color_set(opt->color_match_selected, def->color_match_selected);
170 color_set(opt->color_selected, def->color_selected);
171 color_set(opt->color_sep, def->color_sep);
172}
173static void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, struct grep_opt *opt)
175{
176 /*
177 * When committing to the pattern type by setting the relevant
178 * fields in grep_opt it's generally not necessary to zero out
179 * the fields we're not choosing, since they won't have been
180 * set by anything. The extended_regexp_option field is the
181 * only exception to this.
182 *
183 * This is because in the process of parsing grep.patternType
184 * & grep.extendedRegexp we set opt->pattern_type_option and
185 * opt->extended_regexp_option, respectively. We then
186 * internally use opt->extended_regexp_option to see if we're
187 * compiling an ERE. It must be unset if that's not actually
188 * the case.
189 */
190 if (pattern_type != GREP_PATTERN_TYPE_ERE &&
191 opt->extended_regexp_option)
192 opt->extended_regexp_option = 0;
193 switch (pattern_type) {
195 case GREP_PATTERN_TYPE_UNSPECIFIED:
196 /* fall through */
197 case GREP_PATTERN_TYPE_BRE:
199 break;
200 case GREP_PATTERN_TYPE_ERE:
202 opt->extended_regexp_option = 1;
203 break;
204 case GREP_PATTERN_TYPE_FIXED:
206 opt->fixed = 1;
207 break;
208 case GREP_PATTERN_TYPE_PCRE:
210#ifdef USE_LIBPCRE2
211 opt->pcre2 = 1;
212#else
213 /*
214 * It's important that pcre1 always be assigned to
215 * even when there's no USE_LIBPCRE* defined. We still
216 * call the PCRE stub function, it just dies with
217 * "cannot use Perl-compatible regexes[...]".
218 */
219 opt->pcre1 = 1;
220#endif
221 break;
222 }
223}
224void grep_commit_pattern_type(enum grep_pattern_type pattern_type, struct grep_opt *opt)
226{
227 if (pattern_type != GREP_PATTERN_TYPE_UNSPECIFIED)
228 grep_set_pattern_type_option(pattern_type, opt);
229 else if (opt->pattern_type_option != GREP_PATTERN_TYPE_UNSPECIFIED)
230 grep_set_pattern_type_option(opt->pattern_type_option, opt);
231 else if (opt->extended_regexp_option)
232 /*
233 * This branch *must* happen after setting from the
234 * opt->pattern_type_option above, we don't want
235 * grep.extendedRegexp to override grep.patternType!
236 */
237 grep_set_pattern_type_option(GREP_PATTERN_TYPE_ERE, opt);
238}
239static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
241 const char *origin, int no,
242 enum grep_pat_token t,
243 enum grep_header_field field)
244{
245 struct grep_pat *p = xcalloc(1, sizeof(*p));
246 p->pattern = xmemdupz(pat, patlen);
247 p->patternlen = patlen;
248 p->origin = origin;
249 p->no = no;
250 p->token = t;
251 p->field = field;
252 return p;
253}
254static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
256{
257 **tail = p;
258 *tail = &p->next;
259 p->next = NULL;
260 switch (p->token) {
262 case GREP_PATTERN: /* atom */
263 case GREP_PATTERN_HEAD:
264 case GREP_PATTERN_BODY:
265 for (;;) {
266 struct grep_pat *new_pat;
267 size_t len = 0;
268 char *cp = p->pattern + p->patternlen, *nl = NULL;
269 while (++len <= p->patternlen) {
270 if (*(--cp) == '\n') {
271 nl = cp;
272 break;
273 }
274 }
275 if (!nl)
276 break;
277 new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
278 p->no, p->token, p->field);
279 new_pat->next = p->next;
280 if (!p->next)
281 *tail = &new_pat->next;
282 p->next = new_pat;
283 *nl = '\0';
284 p->patternlen -= len;
285 }
286 break;
287 default:
288 break;
289 }
290}
291void append_header_grep_pattern(struct grep_opt *opt,
293 enum grep_header_field field, const char *pat)
294{
295 struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
296 GREP_PATTERN_HEAD, field);
297 if (field == GREP_HEADER_REFLOG)
298 opt->use_reflog_filter = 1;
299 do_append_grep_pat(&opt->header_tail, p);
300}
301void append_grep_pattern(struct grep_opt *opt, const char *pat,
303 const char *origin, int no, enum grep_pat_token t)
304{
305 append_grep_pat(opt, pat, strlen(pat), origin, no, t);
306}
307void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
309 const char *origin, int no, enum grep_pat_token t)
310{
311 struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
312 do_append_grep_pat(&opt->pattern_tail, p);
313}
314struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
316{
317 struct grep_pat *pat;
318 struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
319 *ret = *opt;
320 ret->pattern_list = NULL;
322 ret->pattern_tail = &ret->pattern_list;
323 for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
325 {
326 if(pat->token == GREP_PATTERN_HEAD)
327 append_header_grep_pattern(ret, pat->field,
328 pat->pattern);
329 else
330 append_grep_pat(ret, pat->pattern, pat->patternlen,
331 pat->origin, pat->no, pat->token);
332 }
333 return ret;
335}
336static NORETURN void compile_regexp_failed(const struct grep_pat *p,
338 const char *error)
339{
340 char where[1024];
341 if (p->no)
343 xsnprintf(where, sizeof(where), "In '%s' at %d, ", p->origin, p->no);
344 else if (p->origin)
345 xsnprintf(where, sizeof(where), "%s, ", p->origin);
346 else
347 where[0] = 0;
348 die("%s'%s': %s", where, p->pattern, error);
350}
351static int is_fixed(const char *s, size_t len)
353{
354 size_t i;
355 for (i = 0; i < len; i++) {
357 if (is_regex_special(s[i]))
358 return 0;
359 }
360 return 1;
362}
363static int has_null(const char *s, size_t len)
365{
366 /*
367 * regcomp cannot accept patterns with NULs so when using it
368 * we consider any pattern containing a NUL fixed.
369 */
370 if (memchr(s, 0, len))
371 return 1;
372 return 0;
374}
375#ifdef USE_LIBPCRE1
377static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
378{
379 const char *error;
380 int erroffset;
381 int options = PCRE_MULTILINE;
382 if (opt->ignore_case) {
384 if (has_non_ascii(p->pattern))
385 p->pcre1_tables = pcre_maketables();
386 options |= PCRE_CASELESS;
387 }
388 if (is_utf8_locale() && has_non_ascii(p->pattern))
389 options |= PCRE_UTF8;
390 p->pcre1_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
392 p->pcre1_tables);
393 if (!p->pcre1_regexp)
394 compile_regexp_failed(p, error);
395 p->pcre1_extra_info = pcre_study(p->pcre1_regexp, GIT_PCRE_STUDY_JIT_COMPILE, &error);
397 if (!p->pcre1_extra_info && error)
398 die("%s", error);
399#ifdef GIT_PCRE1_USE_JIT
401 pcre_config(PCRE_CONFIG_JIT, &p->pcre1_jit_on);
402 if (p->pcre1_jit_on == 1) {
403 p->pcre1_jit_stack = pcre_jit_stack_alloc(1, 1024 * 1024);
404 if (!p->pcre1_jit_stack)
405 die("Couldn't allocate PCRE JIT stack");
406 pcre_assign_jit_stack(p->pcre1_extra_info, NULL, p->pcre1_jit_stack);
407 } else if (p->pcre1_jit_on != 0) {
408 die("BUG: The pcre1_jit_on variable should be 0 or 1, not %d",
409 p->pcre1_jit_on);
410 }
411#endif
412}
413static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
415 regmatch_t *match, int eflags)
416{
417 int ovector[30], ret, flags = 0;
418 if (eflags & REG_NOTBOL)
420 flags |= PCRE_NOTBOL;
421#ifdef GIT_PCRE1_USE_JIT
423 if (p->pcre1_jit_on) {
424 ret = pcre_jit_exec(p->pcre1_regexp, p->pcre1_extra_info, line,
425 eol - line, 0, flags, ovector,
426 ARRAY_SIZE(ovector), p->pcre1_jit_stack);
427 } else
428#endif
429 {
430 ret = pcre_exec(p->pcre1_regexp, p->pcre1_extra_info, line,
431 eol - line, 0, flags, ovector,
432 ARRAY_SIZE(ovector));
433 }
434 if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
436 die("pcre_exec failed with error code %d", ret);
437 if (ret > 0) {
438 ret = 0;
439 match->rm_so = ovector[0];
440 match->rm_eo = ovector[1];
441 }
442 return ret;
444}
445static void free_pcre1_regexp(struct grep_pat *p)
447{
448 pcre_free(p->pcre1_regexp);
449#ifdef GIT_PCRE1_USE_JIT
450 if (p->pcre1_jit_on) {
451 pcre_free_study(p->pcre1_extra_info);
452 pcre_jit_stack_free(p->pcre1_jit_stack);
453 } else
454#endif
455 {
456 pcre_free(p->pcre1_extra_info);
457 }
458 pcre_free((void *)p->pcre1_tables);
459}
460#else /* !USE_LIBPCRE1 */
461static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
462{
463 die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
464}
465static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
467 regmatch_t *match, int eflags)
468{
469 return 1;
470}
471static void free_pcre1_regexp(struct grep_pat *p)
473{
474}
475#endif /* !USE_LIBPCRE1 */
476#ifdef USE_LIBPCRE2
478static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
479{
480 int error;
481 PCRE2_UCHAR errbuf[256];
482 PCRE2_SIZE erroffset;
483 int options = PCRE2_MULTILINE;
484 const uint8_t *character_tables = NULL;
485 int jitret;
486 int patinforet;
487 size_t jitsizearg;
488 assert(opt->pcre2);
490 p->pcre2_compile_context = NULL;
492 if (opt->ignore_case) {
494 if (has_non_ascii(p->pattern)) {
495 character_tables = pcre2_maketables(NULL);
496 p->pcre2_compile_context = pcre2_compile_context_create(NULL);
497 pcre2_set_character_tables(p->pcre2_compile_context, character_tables);
498 }
499 options |= PCRE2_CASELESS;
500 }
501 if (is_utf8_locale() && has_non_ascii(p->pattern))
502 options |= PCRE2_UTF;
503 p->pcre2_pattern = pcre2_compile((PCRE2_SPTR)p->pattern,
505 p->patternlen, options, &error, &erroffset,
506 p->pcre2_compile_context);
507 if (p->pcre2_pattern) {
509 p->pcre2_match_data = pcre2_match_data_create_from_pattern(p->pcre2_pattern, NULL);
510 if (!p->pcre2_match_data)
511 die("Couldn't allocate PCRE2 match data");
512 } else {
513 pcre2_get_error_message(error, errbuf, sizeof(errbuf));
514 compile_regexp_failed(p, (const char *)&errbuf);
515 }
516 pcre2_config(PCRE2_CONFIG_JIT, &p->pcre2_jit_on);
518 if (p->pcre2_jit_on == 1) {
519 jitret = pcre2_jit_compile(p->pcre2_pattern, PCRE2_JIT_COMPLETE);
520 if (jitret)
521 die("Couldn't JIT the PCRE2 pattern '%s', got '%d'\n", p->pattern, jitret);
522 /*
524 * The pcre2_config(PCRE2_CONFIG_JIT, ...) call just
525 * tells us whether the library itself supports JIT,
526 * but to see whether we're going to be actually using
527 * JIT we need to extract PCRE2_INFO_JITSIZE from the
528 * pattern *after* we do pcre2_jit_compile() above.
529 *
530 * This is because if the pattern contains the
531 * (*NO_JIT) verb (see pcre2syntax(3))
532 * pcre2_jit_compile() will exit early with 0. If we
533 * then proceed to call pcre2_jit_match() further down
534 * the line instead of pcre2_match() we'll either
535 * segfault (pre PCRE 10.31) or run into a fatal error
536 * (post PCRE2 10.31)
537 */
538 patinforet = pcre2_pattern_info(p->pcre2_pattern, PCRE2_INFO_JITSIZE, &jitsizearg);
539 if (patinforet)
540 BUG("pcre2_pattern_info() failed: %d", patinforet);
541 if (jitsizearg == 0) {
542 p->pcre2_jit_on = 0;
543 return;
544 }
545 p->pcre2_jit_stack = pcre2_jit_stack_create(1, 1024 * 1024, NULL);
547 if (!p->pcre2_jit_stack)
548 die("Couldn't allocate PCRE2 JIT stack");
549 p->pcre2_match_context = pcre2_match_context_create(NULL);
550 if (!p->pcre2_match_context)
551 die("Couldn't allocate PCRE2 match context");
552 pcre2_jit_stack_assign(p->pcre2_match_context, NULL, p->pcre2_jit_stack);
553 } else if (p->pcre2_jit_on != 0) {
554 die("BUG: The pcre2_jit_on variable should be 0 or 1, not %d",
555 p->pcre1_jit_on);
556 }
557}
558static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
560 regmatch_t *match, int eflags)
561{
562 int ret, flags = 0;
563 PCRE2_SIZE *ovector;
564 PCRE2_UCHAR errbuf[256];
565 if (eflags & REG_NOTBOL)
567 flags |= PCRE2_NOTBOL;
568 if (p->pcre2_jit_on)
570 ret = pcre2_jit_match(p->pcre2_pattern, (unsigned char *)line,
571 eol - line, 0, flags, p->pcre2_match_data,
572 NULL);
573 else
574 ret = pcre2_match(p->pcre2_pattern, (unsigned char *)line,
575 eol - line, 0, flags, p->pcre2_match_data,
576 NULL);
577 if (ret < 0 && ret != PCRE2_ERROR_NOMATCH) {
579 pcre2_get_error_message(ret, errbuf, sizeof(errbuf));
580 die("%s failed with error code %d: %s",
581 (p->pcre2_jit_on ? "pcre2_jit_match" : "pcre2_match"), ret,
582 errbuf);
583 }
584 if (ret > 0) {
585 ovector = pcre2_get_ovector_pointer(p->pcre2_match_data);
586 ret = 0;
587 match->rm_so = (int)ovector[0];
588 match->rm_eo = (int)ovector[1];
589 }
590 return ret;
592}
593static void free_pcre2_pattern(struct grep_pat *p)
595{
596 pcre2_compile_context_free(p->pcre2_compile_context);
597 pcre2_code_free(p->pcre2_pattern);
598 pcre2_match_data_free(p->pcre2_match_data);
599 pcre2_jit_stack_free(p->pcre2_jit_stack);
600 pcre2_match_context_free(p->pcre2_match_context);
601}
602#else /* !USE_LIBPCRE2 */
603static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
604{
605 /*
606 * Unreachable until USE_LIBPCRE2 becomes synonymous with
607 * USE_LIBPCRE. See the sibling comment in
608 * grep_set_pattern_type_option().
609 */
610 die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
611}
612static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
614 regmatch_t *match, int eflags)
615{
616 return 1;
617}
618static void free_pcre2_pattern(struct grep_pat *p)
620{
621}
622#endif /* !USE_LIBPCRE2 */
623static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
625{
626 struct strbuf sb = STRBUF_INIT;
627 int err;
628 int regflags = 0;
629 basic_regex_quote_buf(&sb, p->pattern);
631 if (opt->ignore_case)
632 regflags |= REG_ICASE;
633 err = regcomp(&p->regexp, sb.buf, regflags);
634 if (opt->debug)
635 fprintf(stderr, "fixed %s\n", sb.buf);
636 strbuf_release(&sb);
637 if (err) {
638 char errbuf[1024];
639 regerror(err, &p->regexp, errbuf, sizeof(errbuf));
640 regfree(&p->regexp);
641 compile_regexp_failed(p, errbuf);
642 }
643}
644static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
646{
647 int ascii_only;
648 int err;
649 int regflags = REG_NEWLINE;
650 p->word_regexp = opt->word_regexp;
652 p->ignore_case = opt->ignore_case;
653 ascii_only = !has_non_ascii(p->pattern);
654 /*
656 * Even when -F (fixed) asks us to do a non-regexp search, we
657 * may not be able to correctly case-fold when -i
658 * (ignore-case) is asked (in which case, we'll synthesize a
659 * regexp to match the pattern that matches regexp special
660 * characters literally, while ignoring case differences). On
661 * the other hand, even without -F, if the pattern does not
662 * have any regexp special characters and there is no need for
663 * case-folding search, we can internally turn it into a
664 * simple string match using kws. p->fixed tells us if we
665 * want to use kws.
666 */
667 if (opt->fixed ||
668 has_null(p->pattern, p->patternlen) ||
669 is_fixed(p->pattern, p->patternlen))
670 p->fixed = !p->ignore_case || ascii_only;
671 if (p->fixed) {
673 p->kws = kwsalloc(p->ignore_case ? tolower_trans_tbl : NULL);
674 kwsincr(p->kws, p->pattern, p->patternlen);
675 kwsprep(p->kws);
676 return;
677 } else if (opt->fixed) {
678 /*
679 * We come here when the pattern has the non-ascii
680 * characters we cannot case-fold, and asked to
681 * ignore-case.
682 */
683 compile_fixed_regexp(p, opt);
684 return;
685 }
686 if (opt->pcre2) {
688 compile_pcre2_pattern(p, opt);
689 return;
690 }
691 if (opt->pcre1) {
693 compile_pcre1_regexp(p, opt);
694 return;
695 }
696 if (p->ignore_case)
698 regflags |= REG_ICASE;
699 if (opt->extended_regexp_option)
700 regflags |= REG_EXTENDED;
701 err = regcomp(&p->regexp, p->pattern, regflags);
702 if (err) {
703 char errbuf[1024];
704 regerror(err, &p->regexp, errbuf, 1024);
705 regfree(&p->regexp);
706 compile_regexp_failed(p, errbuf);
707 }
708}
709static struct grep_expr *compile_pattern_or(struct grep_pat **);
711static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
712{
713 struct grep_pat *p;
714 struct grep_expr *x;
715 p = *list;
717 if (!p)
718 return NULL;
719 switch (p->token) {
720 case GREP_PATTERN: /* atom */
721 case GREP_PATTERN_HEAD:
722 case GREP_PATTERN_BODY:
723 x = xcalloc(1, sizeof (struct grep_expr));
724 x->node = GREP_NODE_ATOM;
725 x->u.atom = p;
726 *list = p->next;
727 return x;
728 case GREP_OPEN_PAREN:
729 *list = p->next;
730 x = compile_pattern_or(list);
731 if (!*list || (*list)->token != GREP_CLOSE_PAREN)
732 die("unmatched parenthesis");
733 *list = (*list)->next;
734 return x;
735 default:
736 return NULL;
737 }
738}
739static struct grep_expr *compile_pattern_not(struct grep_pat **list)
741{
742 struct grep_pat *p;
743 struct grep_expr *x;
744 p = *list;
746 if (!p)
747 return NULL;
748 switch (p->token) {
749 case GREP_NOT:
750 if (!p->next)
751 die("--not not followed by pattern expression");
752 *list = p->next;
753 x = xcalloc(1, sizeof (struct grep_expr));
754 x->node = GREP_NODE_NOT;
755 x->u.unary = compile_pattern_not(list);
756 if (!x->u.unary)
757 die("--not followed by non pattern expression");
758 return x;
759 default:
760 return compile_pattern_atom(list);
761 }
762}
763static struct grep_expr *compile_pattern_and(struct grep_pat **list)
765{
766 struct grep_pat *p;
767 struct grep_expr *x, *y, *z;
768 x = compile_pattern_not(list);
770 p = *list;
771 if (p && p->token == GREP_AND) {
772 if (!p->next)
773 die("--and not followed by pattern expression");
774 *list = p->next;
775 y = compile_pattern_and(list);
776 if (!y)
777 die("--and not followed by pattern expression");
778 z = xcalloc(1, sizeof (struct grep_expr));
779 z->node = GREP_NODE_AND;
780 z->u.binary.left = x;
781 z->u.binary.right = y;
782 return z;
783 }
784 return x;
785}
786static struct grep_expr *compile_pattern_or(struct grep_pat **list)
788{
789 struct grep_pat *p;
790 struct grep_expr *x, *y, *z;
791 x = compile_pattern_and(list);
793 p = *list;
794 if (x && p && p->token != GREP_CLOSE_PAREN) {
795 y = compile_pattern_or(list);
796 if (!y)
797 die("not a pattern expression %s", p->pattern);
798 z = xcalloc(1, sizeof (struct grep_expr));
799 z->node = GREP_NODE_OR;
800 z->u.binary.left = x;
801 z->u.binary.right = y;
802 return z;
803 }
804 return x;
805}
806static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
808{
809 return compile_pattern_or(list);
810}
811static void indent(int in)
813{
814 while (in-- > 0)
815 fputc(' ', stderr);
816}
817static void dump_grep_pat(struct grep_pat *p)
819{
820 switch (p->token) {
821 case GREP_AND: fprintf(stderr, "*and*"); break;
822 case GREP_OPEN_PAREN: fprintf(stderr, "*(*"); break;
823 case GREP_CLOSE_PAREN: fprintf(stderr, "*)*"); break;
824 case GREP_NOT: fprintf(stderr, "*not*"); break;
825 case GREP_OR: fprintf(stderr, "*or*"); break;
826 case GREP_PATTERN: fprintf(stderr, "pattern"); break;
828 case GREP_PATTERN_HEAD: fprintf(stderr, "pattern_head"); break;
829 case GREP_PATTERN_BODY: fprintf(stderr, "pattern_body"); break;
830 }
831 switch (p->token) {
833 default: break;
834 case GREP_PATTERN_HEAD:
835 fprintf(stderr, "<head %d>", p->field); break;
836 case GREP_PATTERN_BODY:
837 fprintf(stderr, "<body>"); break;
838 }
839 switch (p->token) {
840 default: break;
841 case GREP_PATTERN_HEAD:
842 case GREP_PATTERN_BODY:
843 case GREP_PATTERN:
844 fprintf(stderr, "%.*s", (int)p->patternlen, p->pattern);
845 break;
846 }
847 fputc('\n', stderr);
848}
849static void dump_grep_expression_1(struct grep_expr *x, int in)
851{
852 indent(in);
853 switch (x->node) {
854 case GREP_NODE_TRUE:
855 fprintf(stderr, "true\n");
856 break;
857 case GREP_NODE_ATOM:
858 dump_grep_pat(x->u.atom);
859 break;
860 case GREP_NODE_NOT:
861 fprintf(stderr, "(not\n");
862 dump_grep_expression_1(x->u.unary, in+1);
863 indent(in);
864 fprintf(stderr, ")\n");
865 break;
866 case GREP_NODE_AND:
867 fprintf(stderr, "(and\n");
868 dump_grep_expression_1(x->u.binary.left, in+1);
869 dump_grep_expression_1(x->u.binary.right, in+1);
870 indent(in);
871 fprintf(stderr, ")\n");
872 break;
873 case GREP_NODE_OR:
874 fprintf(stderr, "(or\n");
875 dump_grep_expression_1(x->u.binary.left, in+1);
876 dump_grep_expression_1(x->u.binary.right, in+1);
877 indent(in);
878 fprintf(stderr, ")\n");
879 break;
880 }
881}
882static void dump_grep_expression(struct grep_opt *opt)
884{
885 struct grep_expr *x = opt->pattern_expression;
886 if (opt->all_match)
888 fprintf(stderr, "[all-match]\n");
889 dump_grep_expression_1(x, 0);
890 fflush(NULL);
891}
892static struct grep_expr *grep_true_expr(void)
894{
895 struct grep_expr *z = xcalloc(1, sizeof(*z));
896 z->node = GREP_NODE_TRUE;
897 return z;
898}
899static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
901{
902 struct grep_expr *z = xcalloc(1, sizeof(*z));
903 z->node = GREP_NODE_OR;
904 z->u.binary.left = left;
905 z->u.binary.right = right;
906 return z;
907}
908static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
910{
911 struct grep_pat *p;
912 struct grep_expr *header_expr;
913 struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
914 enum grep_header_field fld;
915 if (!opt->header_list)
917 return NULL;
918 for (p = opt->header_list; p; p = p->next) {
920 if (p->token != GREP_PATTERN_HEAD)
921 die("BUG: a non-header pattern in grep header list.");
922 if (p->field < GREP_HEADER_FIELD_MIN ||
923 GREP_HEADER_FIELD_MAX <= p->field)
924 die("BUG: unknown header field %d", p->field);
925 compile_regexp(p, opt);
926 }
927 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
929 header_group[fld] = NULL;
930 for (p = opt->header_list; p; p = p->next) {
932 struct grep_expr *h;
933 struct grep_pat *pp = p;
934 h = compile_pattern_atom(&pp);
936 if (!h || pp != p->next)
937 die("BUG: malformed header expr");
938 if (!header_group[p->field]) {
939 header_group[p->field] = h;
940 continue;
941 }
942 header_group[p->field] = grep_or_expr(h, header_group[p->field]);
943 }
944 header_expr = NULL;
946 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
948 if (!header_group[fld])
949 continue;
950 if (!header_expr)
951 header_expr = grep_true_expr();
952 header_expr = grep_or_expr(header_group[fld], header_expr);
953 }
954 return header_expr;
955}
956static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
958{
959 struct grep_expr *z = x;
960 while (x) {
962 assert(x->node == GREP_NODE_OR);
963 if (x->u.binary.right &&
964 x->u.binary.right->node == GREP_NODE_TRUE) {
965 x->u.binary.right = y;
966 break;
967 }
968 x = x->u.binary.right;
969 }
970 return z;
971}
972static void compile_grep_patterns_real(struct grep_opt *opt)
974{
975 struct grep_pat *p;
976 struct grep_expr *header_expr = prep_header_patterns(opt);
977 for (p = opt->pattern_list; p; p = p->next) {
979 switch (p->token) {
980 case GREP_PATTERN: /* atom */
981 case GREP_PATTERN_HEAD:
982 case GREP_PATTERN_BODY:
983 compile_regexp(p, opt);
984 break;
985 default:
986 opt->extended = 1;
987 break;
988 }
989 }
990 if (opt->all_match || header_expr)
992 opt->extended = 1;
993 else if (!opt->extended && !opt->debug)
994 return;
995 p = opt->pattern_list;
997 if (p)
998 opt->pattern_expression = compile_pattern_expr(&p);
999 if (p)
1000 die("incomplete pattern expression: %s", p->pattern);
1001 if (!header_expr)
1003 return;
1004 if (!opt->pattern_expression)
1006 opt->pattern_expression = header_expr;
1007 else if (opt->all_match)
1008 opt->pattern_expression = grep_splice_or(header_expr,
1009 opt->pattern_expression);
1010 else
1011 opt->pattern_expression = grep_or_expr(opt->pattern_expression,
1012 header_expr);
1013 opt->all_match = 1;
1014}
1015void compile_grep_patterns(struct grep_opt *opt)
1017{
1018 compile_grep_patterns_real(opt);
1019 if (opt->debug)
1020 dump_grep_expression(opt);
1021}
1022static void free_pattern_expr(struct grep_expr *x)
1024{
1025 switch (x->node) {
1026 case GREP_NODE_TRUE:
1027 case GREP_NODE_ATOM:
1028 break;
1029 case GREP_NODE_NOT:
1030 free_pattern_expr(x->u.unary);
1031 break;
1032 case GREP_NODE_AND:
1033 case GREP_NODE_OR:
1034 free_pattern_expr(x->u.binary.left);
1035 free_pattern_expr(x->u.binary.right);
1036 break;
1037 }
1038 free(x);
1039}
1040void free_grep_patterns(struct grep_opt *opt)
1042{
1043 struct grep_pat *p, *n;
1044 for (p = opt->pattern_list; p; p = n) {
1046 n = p->next;
1047 switch (p->token) {
1048 case GREP_PATTERN: /* atom */
1049 case GREP_PATTERN_HEAD:
1050 case GREP_PATTERN_BODY:
1051 if (p->kws)
1052 kwsfree(p->kws);
1053 else if (p->pcre1_regexp)
1054 free_pcre1_regexp(p);
1055 else if (p->pcre2_pattern)
1056 free_pcre2_pattern(p);
1057 else
1058 regfree(&p->regexp);
1059 free(p->pattern);
1060 break;
1061 default:
1062 break;
1063 }
1064 free(p);
1065 }
1066 if (!opt->extended)
1068 return;
1069 free_pattern_expr(opt->pattern_expression);
1070}
1071static char *end_of_line(char *cp, unsigned long *left)
1073{
1074 unsigned long l = *left;
1075 while (l && *cp != '\n') {
1076 l--;
1077 cp++;
1078 }
1079 *left = l;
1080 return cp;
1081}
1082static int word_char(char ch)
1084{
1085 return isalnum(ch) || ch == '_';
1086}
1087static void output_color(struct grep_opt *opt, const void *data, size_t size,
1089 const char *color)
1090{
1091 if (want_color(opt->color) && color && color[0]) {
1092 opt->output(opt, color, strlen(color));
1093 opt->output(opt, data, size);
1094 opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
1095 } else
1096 opt->output(opt, data, size);
1097}
1098static void output_sep(struct grep_opt *opt, char sign)
1100{
1101 if (opt->null_following_name)
1102 opt->output(opt, "\0", 1);
1103 else
1104 output_color(opt, &sign, 1, opt->color_sep);
1105}
1106static void show_name(struct grep_opt *opt, const char *name)
1108{
1109 output_color(opt, name, strlen(name), opt->color_filename);
1110 opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
1111}
1112static int fixmatch(struct grep_pat *p, char *line, char *eol,
1114 regmatch_t *match)
1115{
1116 struct kwsmatch kwsm;
1117 size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
1118 if (offset == -1) {
1119 match->rm_so = match->rm_eo = -1;
1120 return REG_NOMATCH;
1121 } else {
1122 match->rm_so = offset;
1123 match->rm_eo = match->rm_so + kwsm.size[0];
1124 return 0;
1125 }
1126}
1127static int patmatch(struct grep_pat *p, char *line, char *eol,
1129 regmatch_t *match, int eflags)
1130{
1131 int hit;
1132 if (p->fixed)
1134 hit = !fixmatch(p, line, eol, match);
1135 else if (p->pcre1_regexp)
1136 hit = !pcre1match(p, line, eol, match, eflags);
1137 else if (p->pcre2_pattern)
1138 hit = !pcre2match(p, line, eol, match, eflags);
1139 else
1140 hit = !regexec_buf(&p->regexp, line, eol - line, 1, match,
1141 eflags);
1142 return hit;
1144}
1145static int strip_timestamp(char *bol, char **eol_p)
1147{
1148 char *eol = *eol_p;
1149 int ch;
1150 while (bol < --eol) {
1152 if (*eol != '>')
1153 continue;
1154 *eol_p = ++eol;
1155 ch = *eol;
1156 *eol = '\0';
1157 return ch;
1158 }
1159 return 0;
1160}
1161static struct {
1163 const char *field;
1164 size_t len;
1165} header_field[] = {
1166 { "author ", 7 },
1167 { "committer ", 10 },
1168 { "reflog ", 7 },
1169};
1170static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
1172 enum grep_context ctx,
1173 regmatch_t *pmatch, int eflags)
1174{
1175 int hit = 0;
1176 int saved_ch = 0;
1177 const char *start = bol;
1178 if ((p->token != GREP_PATTERN) &&
1180 ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
1181 return 0;
1182 if (p->token == GREP_PATTERN_HEAD) {
1184 const char *field;
1185 size_t len;
1186 assert(p->field < ARRAY_SIZE(header_field));
1187 field = header_field[p->field].field;
1188 len = header_field[p->field].len;
1189 if (strncmp(bol, field, len))
1190 return 0;
1191 bol += len;
1192 switch (p->field) {
1193 case GREP_HEADER_AUTHOR:
1194 case GREP_HEADER_COMMITTER:
1195 saved_ch = strip_timestamp(bol, &eol);
1196 break;
1197 default:
1198 break;
1199 }
1200 }
1201 again:
1203 hit = patmatch(p, bol, eol, pmatch, eflags);
1204 if (hit && p->word_regexp) {
1206 if ((pmatch[0].rm_so < 0) ||
1207 (eol - bol) < pmatch[0].rm_so ||
1208 (pmatch[0].rm_eo < 0) ||
1209 (eol - bol) < pmatch[0].rm_eo)
1210 die("regexp returned nonsense");
1211 /* Match beginning must be either beginning of the
1213 * line, or at word boundary (i.e. the last char must
1214 * not be a word char). Similarly, match end must be
1215 * either end of the line, or at word boundary
1216 * (i.e. the next char must not be a word char).
1217 */
1218 if ( ((pmatch[0].rm_so == 0) ||
1219 !word_char(bol[pmatch[0].rm_so-1])) &&
1220 ((pmatch[0].rm_eo == (eol-bol)) ||
1221 !word_char(bol[pmatch[0].rm_eo])) )
1222 ;
1223 else
1224 hit = 0;
1225 /* Words consist of at least one character. */
1227 if (pmatch->rm_so == pmatch->rm_eo)
1228 hit = 0;
1229 if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
1231 /* There could be more than one match on the
1232 * line, and the first match might not be
1233 * strict word match. But later ones could be!
1234 * Forward to the next possible start, i.e. the
1235 * next position following a non-word char.
1236 */
1237 bol = pmatch[0].rm_so + bol + 1;
1238 while (word_char(bol[-1]) && bol < eol)
1239 bol++;
1240 eflags |= REG_NOTBOL;
1241 if (bol < eol)
1242 goto again;
1243 }
1244 }
1245 if (p->token == GREP_PATTERN_HEAD && saved_ch)
1246 *eol = saved_ch;
1247 if (hit) {
1248 pmatch[0].rm_so += bol - start;
1249 pmatch[0].rm_eo += bol - start;
1250 }
1251 return hit;
1252}
1253static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
1255 enum grep_context ctx, int collect_hits)
1256{
1257 int h = 0;
1258 regmatch_t match;
1259 if (!x)
1261 die("Not a valid grep expression");
1262 switch (x->node) {
1263 case GREP_NODE_TRUE:
1264 h = 1;
1265 break;
1266 case GREP_NODE_ATOM:
1267 h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
1268 break;
1269 case GREP_NODE_NOT:
1270 h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
1271 break;
1272 case GREP_NODE_AND:
1273 if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
1274 return 0;
1275 h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
1276 break;
1277 case GREP_NODE_OR:
1278 if (!collect_hits)
1279 return (match_expr_eval(x->u.binary.left,
1280 bol, eol, ctx, 0) ||
1281 match_expr_eval(x->u.binary.right,
1282 bol, eol, ctx, 0));
1283 h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
1284 x->u.binary.left->hit |= h;
1285 h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
1286 break;
1287 default:
1288 die("Unexpected node type (internal error) %d", x->node);
1289 }
1290 if (collect_hits)
1291 x->hit |= h;
1292 return h;
1293}
1294static int match_expr(struct grep_opt *opt, char *bol, char *eol,
1296 enum grep_context ctx, int collect_hits)
1297{
1298 struct grep_expr *x = opt->pattern_expression;
1299 return match_expr_eval(x, bol, eol, ctx, collect_hits);
1300}
1301static int match_line(struct grep_opt *opt, char *bol, char *eol,
1303 enum grep_context ctx, int collect_hits)
1304{
1305 struct grep_pat *p;
1306 regmatch_t match;
1307 if (opt->extended)
1309 return match_expr(opt, bol, eol, ctx, collect_hits);
1310 /* we do not call with collect_hits without being extended */
1312 for (p = opt->pattern_list; p; p = p->next) {
1313 if (match_one_pattern(p, bol, eol, ctx, &match, 0))
1314 return 1;
1315 }
1316 return 0;
1317}
1318static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
1320 enum grep_context ctx,
1321 regmatch_t *pmatch, int eflags)
1322{
1323 regmatch_t match;
1324 if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
1326 return 0;
1327 if (match.rm_so < 0 || match.rm_eo < 0)
1328 return 0;
1329 if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
1330 if (match.rm_so > pmatch->rm_so)
1331 return 1;
1332 if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
1333 return 1;
1334 }
1335 pmatch->rm_so = match.rm_so;
1336 pmatch->rm_eo = match.rm_eo;
1337 return 1;
1338}
1339static int next_match(struct grep_opt *opt, char *bol, char *eol,
1341 enum grep_context ctx, regmatch_t *pmatch, int eflags)
1342{
1343 struct grep_pat *p;
1344 int hit = 0;
1345 pmatch->rm_so = pmatch->rm_eo = -1;
1347 if (bol < eol) {
1348 for (p = opt->pattern_list; p; p = p->next) {
1349 switch (p->token) {
1350 case GREP_PATTERN: /* atom */
1351 case GREP_PATTERN_HEAD:
1352 case GREP_PATTERN_BODY:
1353 hit |= match_next_pattern(p, bol, eol, ctx,
1354 pmatch, eflags);
1355 break;
1356 default:
1357 break;
1358 }
1359 }
1360 }
1361 return hit;
1362}
1363static void show_line(struct grep_opt *opt, char *bol, char *eol,
1365 const char *name, unsigned lno, char sign)
1366{
1367 int rest = eol - bol;
1368 const char *match_color, *line_color = NULL;
1369 if (opt->file_break && opt->last_shown == 0) {
1371 if (opt->show_hunk_mark)
1372 opt->output(opt, "\n", 1);
1373 } else if (opt->pre_context || opt->post_context || opt->funcbody) {
1374 if (opt->last_shown == 0) {
1375 if (opt->show_hunk_mark) {
1376 output_color(opt, "--", 2, opt->color_sep);
1377 opt->output(opt, "\n", 1);
1378 }
1379 } else if (lno > opt->last_shown + 1) {
1380 output_color(opt, "--", 2, opt->color_sep);
1381 opt->output(opt, "\n", 1);
1382 }
1383 }
1384 if (opt->heading && opt->last_shown == 0) {
1385 output_color(opt, name, strlen(name), opt->color_filename);
1386 opt->output(opt, "\n", 1);
1387 }
1388 opt->last_shown = lno;
1389 if (!opt->heading && opt->pathname) {
1391 output_color(opt, name, strlen(name), opt->color_filename);
1392 output_sep(opt, sign);
1393 }
1394 if (opt->linenum) {
1395 char buf[32];
1396 xsnprintf(buf, sizeof(buf), "%d", lno);
1397 output_color(opt, buf, strlen(buf), opt->color_lineno);
1398 output_sep(opt, sign);
1399 }
1400 if (opt->color) {
1401 regmatch_t match;
1402 enum grep_context ctx = GREP_CONTEXT_BODY;
1403 int ch = *eol;
1404 int eflags = 0;
1405 if (sign == ':')
1407 match_color = opt->color_match_selected;
1408 else
1409 match_color = opt->color_match_context;
1410 if (sign == ':')
1411 line_color = opt->color_selected;
1412 else if (sign == '-')
1413 line_color = opt->color_context;
1414 else if (sign == '=')
1415 line_color = opt->color_function;
1416 *eol = '\0';
1417 while (next_match(opt, bol, eol, ctx, &match, eflags)) {
1418 if (match.rm_so == match.rm_eo)
1419 break;
1420 output_color(opt, bol, match.rm_so, line_color);
1422 output_color(opt, bol + match.rm_so,
1423 match.rm_eo - match.rm_so, match_color);
1424 bol += match.rm_eo;
1425 rest -= match.rm_eo;
1426 eflags = REG_NOTBOL;
1427 }
1428 *eol = ch;
1429 }
1430 output_color(opt, bol, rest, line_color);
1431 opt->output(opt, "\n", 1);
1432}
1433#ifndef NO_PTHREADS
1435int grep_use_locks;
1436/*
1438 * This lock protects access to the gitattributes machinery, which is
1439 * not thread-safe.
1440 */
1441pthread_mutex_t grep_attr_mutex;
1442static inline void grep_attr_lock(void)
1444{
1445 if (grep_use_locks)
1446 pthread_mutex_lock(&grep_attr_mutex);
1447}
1448static inline void grep_attr_unlock(void)
1450{
1451 if (grep_use_locks)
1452 pthread_mutex_unlock(&grep_attr_mutex);
1453}
1454/*
1456 * Same as git_attr_mutex, but protecting the thread-unsafe object db access.
1457 */
1458pthread_mutex_t grep_read_mutex;
1459#else
1461#define grep_attr_lock()
1462#define grep_attr_unlock()
1463#endif
1464static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
1466{
1467 xdemitconf_t *xecfg = opt->priv;
1468 if (xecfg && !xecfg->find_func) {
1469 grep_source_load_driver(gs);
1470 if (gs->driver->funcname.pattern) {
1471 const struct userdiff_funcname *pe = &gs->driver->funcname;
1472 xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
1473 } else {
1474 xecfg = opt->priv = NULL;
1475 }
1476 }
1477 if (xecfg) {
1479 char buf[1];
1480 return xecfg->find_func(bol, eol - bol, buf, 1,
1481 xecfg->find_func_priv) >= 0;
1482 }
1483 if (bol == eol)
1485 return 0;
1486 if (isalpha(*bol) || *bol == '_' || *bol == '$')
1487 return 1;
1488 return 0;
1489}
1490static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
1492 char *bol, unsigned lno)
1493{
1494 while (bol > gs->buf) {
1495 char *eol = --bol;
1496 while (bol > gs->buf && bol[-1] != '\n')
1498 bol--;
1499 lno--;
1500 if (lno <= opt->last_shown)
1502 break;
1503 if (match_funcname(opt, gs, bol, eol)) {
1505 show_line(opt, bol, eol, gs->name, lno, '=');
1506 break;
1507 }
1508 }
1509}
1510static int is_empty_line(const char *bol, const char *eol);
1512static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
1514 char *bol, char *end, unsigned lno)
1515{
1516 unsigned cur = lno, from = 1, funcname_lno = 0, orig_from;
1517 int funcname_needed = !!opt->funcname, comment_needed = 0;
1518 if (opt->pre_context < lno)
1520 from = lno - opt->pre_context;
1521 if (from <= opt->last_shown)
1522 from = opt->last_shown + 1;
1523 orig_from = from;
1524 if (opt->funcbody) {
1525 if (match_funcname(opt, gs, bol, end))
1526 comment_needed = 1;
1527 else
1528 funcname_needed = 1;
1529 from = opt->last_shown + 1;
1530 }
1531 /* Rewind. */
1533 while (bol > gs->buf && cur > from) {
1534 char *next_bol = bol;
1535 char *eol = --bol;
1536 while (bol > gs->buf && bol[-1] != '\n')
1538 bol--;
1539 cur--;
1540 if (comment_needed && (is_empty_line(bol, eol) ||
1541 match_funcname(opt, gs, bol, eol))) {
1542 comment_needed = 0;
1543 from = orig_from;
1544 if (cur < from) {
1545 cur++;
1546 bol = next_bol;
1547 break;
1548 }
1549 }
1550 if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
1551 funcname_lno = cur;
1552 funcname_needed = 0;
1553 if (opt->funcbody)
1554 comment_needed = 1;
1555 else
1556 from = orig_from;
1557 }
1558 }
1559 /* We need to look even further back to find a function signature. */
1561 if (opt->funcname && funcname_needed)
1562 show_funcname_line(opt, gs, bol, cur);
1563 /* Back forward. */
1565 while (cur < lno) {
1566 char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
1567 while (*eol != '\n')
1569 eol++;
1570 show_line(opt, bol, eol, gs->name, cur, sign);
1571 bol = eol + 1;
1572 cur++;
1573 }
1574}
1575static int should_lookahead(struct grep_opt *opt)
1577{
1578 struct grep_pat *p;
1579 if (opt->extended)
1581 return 0; /* punt for too complex stuff */
1582 if (opt->invert)
1583 return 0;
1584 for (p = opt->pattern_list; p; p = p->next) {
1585 if (p->token != GREP_PATTERN)
1586 return 0; /* punt for "header only" and stuff */
1587 }
1588 return 1;
1589}
1590static int look_ahead(struct grep_opt *opt,
1592 unsigned long *left_p,
1593 unsigned *lno_p,
1594 char **bol_p)
1595{
1596 unsigned lno = *lno_p;
1597 char *bol = *bol_p;
1598 struct grep_pat *p;
1599 char *sp, *last_bol;
1600 regoff_t earliest = -1;
1601 for (p = opt->pattern_list; p; p = p->next) {
1603 int hit;
1604 regmatch_t m;
1605 hit = patmatch(p, bol, bol + *left_p, &m, 0);
1607 if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1608 continue;
1609 if (earliest < 0 || m.rm_so < earliest)
1610 earliest = m.rm_so;
1611 }
1612 if (earliest < 0) {
1614 *bol_p = bol + *left_p;
1615 *left_p = 0;
1616 return 1;
1617 }
1618 for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1619 ; /* find the beginning of the line */
1620 last_bol = sp;
1621 for (sp = bol; sp < last_bol; sp++) {
1623 if (*sp == '\n')
1624 lno++;
1625 }
1626 *left_p -= last_bol - bol;
1627 *bol_p = last_bol;
1628 *lno_p = lno;
1629 return 0;
1630}
1631static int fill_textconv_grep(struct userdiff_driver *driver,
1633 struct grep_source *gs)
1634{
1635 struct diff_filespec *df;
1636 char *buf;
1637 size_t size;
1638 if (!driver || !driver->textconv)
1640 return grep_source_load(gs);
1641 /*
1643 * The textconv interface is intimately tied to diff_filespecs, so we
1644 * have to pretend to be one. If we could unify the grep_source
1645 * and diff_filespec structs, this mess could just go away.
1646 */
1647 df = alloc_filespec(gs->path);
1648 switch (gs->type) {
1649 case GREP_SOURCE_OID:
1650 fill_filespec(df, gs->identifier, 1, 0100644);
1651 break;
1652 case GREP_SOURCE_FILE:
1653 fill_filespec(df, &null_oid, 0, 0100644);
1654 break;
1655 default:
1656 die("BUG: attempt to textconv something without a path?");
1657 }
1658 /*
1660 * fill_textconv is not remotely thread-safe; it may load objects
1661 * behind the scenes, and it modifies the global diff tempfile
1662 * structure.
1663 */
1664 grep_read_lock();
1665 size = fill_textconv(driver, df, &buf);
1666 grep_read_unlock();
1667 free_filespec(df);
1668 /*
1670 * The normal fill_textconv usage by the diff machinery would just keep
1671 * the textconv'd buf separate from the diff_filespec. But much of the
1672 * grep code passes around a grep_source and assumes that its "buf"
1673 * pointer is the beginning of the thing we are searching. So let's
1674 * install our textconv'd version into the grep_source, taking care not
1675 * to leak any existing buffer.
1676 */
1677 grep_source_clear_data(gs);
1678 gs->buf = buf;
1679 gs->size = size;
1680 return 0;
1682}
1683static int is_empty_line(const char *bol, const char *eol)
1685{
1686 while (bol < eol && isspace(*bol))
1687 bol++;
1688 return bol == eol;
1689}
1690static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
1692{
1693 char *bol;
1694 char *peek_bol = NULL;
1695 unsigned long left;
1696 unsigned lno = 1;
1697 unsigned last_hit = 0;
1698 int binary_match_only = 0;
1699 unsigned count = 0;
1700 int try_lookahead = 0;
1701 int show_function = 0;
1702 struct userdiff_driver *textconv = NULL;
1703 enum grep_context ctx = GREP_CONTEXT_HEAD;
1704 xdemitconf_t xecfg;
1705 if (!opt->output)
1707 opt->output = std_output;
1708 if (opt->pre_context || opt->post_context || opt->file_break ||
1710 opt->funcbody) {
1711 /* Show hunk marks, except for the first file. */
1712 if (opt->last_shown)
1713 opt->show_hunk_mark = 1;
1714 /*
1715 * If we're using threads then we can't easily identify
1716 * the first file. Always put hunk marks in that case
1717 * and skip the very first one later in work_done().
1718 */
1719 if (opt->output != std_output)
1720 opt->show_hunk_mark = 1;
1721 }
1722 opt->last_shown = 0;
1723 if (opt->allow_textconv) {
1725 grep_source_load_driver(gs);
1726 /*
1727 * We might set up the shared textconv cache data here, which
1728 * is not thread-safe.
1729 */
1730 grep_attr_lock();
1731 textconv = userdiff_get_textconv(gs->driver);
1732 grep_attr_unlock();
1733 }
1734 /*
1736 * We know the result of a textconv is text, so we only have to care
1737 * about binary handling if we are not using it.
1738 */
1739 if (!textconv) {
1740 switch (opt->binary) {
1741 case GREP_BINARY_DEFAULT:
1742 if (grep_source_is_binary(gs))
1743 binary_match_only = 1;
1744 break;
1745 case GREP_BINARY_NOMATCH:
1746 if (grep_source_is_binary(gs))
1747 return 0; /* Assume unmatch */
1748 break;
1749 case GREP_BINARY_TEXT:
1750 break;
1751 default:
1752 die("BUG: unknown binary handling mode");
1753 }
1754 }
1755 memset(&xecfg, 0, sizeof(xecfg));
1757 opt->priv = &xecfg;
1758 try_lookahead = should_lookahead(opt);
1760 if (fill_textconv_grep(textconv, gs) < 0)
1762 return 0;
1763 bol = gs->buf;
1765 left = gs->size;
1766 while (left) {
1767 char *eol, ch;
1768 int hit;
1769 /*
1771 * look_ahead() skips quickly to the line that possibly
1772 * has the next hit; don't call it if we need to do
1773 * something more than just skipping the current line
1774 * in response to an unmatch for the current line. E.g.
1775 * inside a post-context window, we will show the current
1776 * line as a context around the previous hit when it
1777 * doesn't hit.
1778 */
1779 if (try_lookahead
1780 && !(last_hit
1781 && (show_function ||
1782 lno <= last_hit + opt->post_context))
1783 && look_ahead(opt, &left, &lno, &bol))
1784 break;
1785 eol = end_of_line(bol, &left);
1786 ch = *eol;
1787 *eol = 0;
1788 if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1790 ctx = GREP_CONTEXT_BODY;
1791 hit = match_line(opt, bol, eol, ctx, collect_hits);
1793 *eol = ch;
1794 if (collect_hits)
1796 goto next_line;
1797 /* "grep -v -e foo -e bla" should list lines
1799 * that do not have either, so inversion should
1800 * be done outside.
1801 */
1802 if (opt->invert)
1803 hit = !hit;
1804 if (opt->unmatch_name_only) {
1805 if (hit)
1806 return 0;
1807 goto next_line;
1808 }
1809 if (hit) {
1810 count++;
1811 if (opt->status_only)
1812 return 1;
1813 if (opt->name_only) {
1814 show_name(opt, gs->name);
1815 return 1;
1816 }
1817 if (opt->count)
1818 goto next_line;
1819 if (binary_match_only) {
1820 opt->output(opt, "Binary file ", 12);
1821 output_color(opt, gs->name, strlen(gs->name),
1822 opt->color_filename);
1823 opt->output(opt, " matches\n", 9);
1824 return 1;
1825 }
1826 /* Hit at this line. If we haven't shown the
1827 * pre-context lines, we would need to show them.
1828 */
1829 if (opt->pre_context || opt->funcbody)
1830 show_pre_context(opt, gs, bol, eol, lno);
1831 else if (opt->funcname)
1832 show_funcname_line(opt, gs, bol, lno);
1833 show_line(opt, bol, eol, gs->name, lno, ':');
1834 last_hit = lno;
1835 if (opt->funcbody)
1836 show_function = 1;
1837 goto next_line;
1838 }
1839 if (show_function && (!peek_bol || peek_bol < bol)) {
1840 unsigned long peek_left = left;
1841 char *peek_eol = eol;
1842 /*
1844 * Trailing empty lines are not interesting.
1845 * Peek past them to see if they belong to the
1846 * body of the current function.
1847 */
1848 peek_bol = bol;
1849 while (is_empty_line(peek_bol, peek_eol)) {
1850 peek_bol = peek_eol + 1;
1851 peek_eol = end_of_line(peek_bol, &peek_left);
1852 }
1853 if (match_funcname(opt, gs, peek_bol, peek_eol))
1855 show_function = 0;
1856 }
1857 if (show_function ||
1858 (last_hit && lno <= last_hit + opt->post_context)) {
1859 /* If the last hit is within the post context,
1860 * we need to show this line.
1861 */
1862 show_line(opt, bol, eol, gs->name, lno, '-');
1863 }
1864 next_line:
1866 bol = eol + 1;
1867 if (!left)
1868 break;
1869 left--;
1870 lno++;
1871 }
1872 if (collect_hits)
1874 return 0;
1875 if (opt->status_only)
1877 return opt->unmatch_name_only;
1878 if (opt->unmatch_name_only) {
1879 /* We did not see any hit, so we want to show this */
1880 show_name(opt, gs->name);
1881 return 1;
1882 }
1883 xdiff_clear_find_func(&xecfg);
1885 opt->priv = NULL;
1886 /* NEEDSWORK:
1888 * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1889 * which feels mostly useless but sometimes useful. Maybe
1890 * make it another option? For now suppress them.
1891 */
1892 if (opt->count && count) {
1893 char buf[32];
1894 if (opt->pathname) {
1895 output_color(opt, gs->name, strlen(gs->name),
1896 opt->color_filename);
1897 output_sep(opt, ':');
1898 }
1899 xsnprintf(buf, sizeof(buf), "%u\n", count);
1900 opt->output(opt, buf, strlen(buf));
1901 return 1;
1902 }
1903 return !!last_hit;
1904}
1905static void clr_hit_marker(struct grep_expr *x)
1907{
1908 /* All-hit markers are meaningful only at the very top level
1909 * OR node.
1910 */
1911 while (1) {
1912 x->hit = 0;
1913 if (x->node != GREP_NODE_OR)
1914 return;
1915 x->u.binary.left->hit = 0;
1916 x = x->u.binary.right;
1917 }
1918}
1919static int chk_hit_marker(struct grep_expr *x)
1921{
1922 /* Top level nodes have hit markers. See if they all are hits */
1923 while (1) {
1924 if (x->node != GREP_NODE_OR)
1925 return x->hit;
1926 if (!x->u.binary.left->hit)
1927 return 0;
1928 x = x->u.binary.right;
1929 }
1930}
1931int grep_source(struct grep_opt *opt, struct grep_source *gs)
1933{
1934 /*
1935 * we do not have to do the two-pass grep when we do not check
1936 * buffer-wide "all-match".
1937 */
1938 if (!opt->all_match)
1939 return grep_source_1(opt, gs, 0);
1940 /* Otherwise the toplevel "or" terms hit a bit differently.
1942 * We first clear hit markers from them.
1943 */
1944 clr_hit_marker(opt->pattern_expression);
1945 grep_source_1(opt, gs, 1);
1946 if (!chk_hit_marker(opt->pattern_expression))
1948 return 0;
1949 return grep_source_1(opt, gs, 0);
1951}
1952int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
1954{
1955 struct grep_source gs;
1956 int r;
1957 grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL, NULL);
1959 gs.buf = buf;
1960 gs.size = size;
1961 r = grep_source(opt, &gs);
1963 grep_source_clear(&gs);
1965 return r;
1966}
1967void grep_source_init(struct grep_source *gs, enum grep_source_type type,
1969 const char *name, const char *path,
1970 const void *identifier)
1971{
1972 gs->type = type;
1973 gs->name = xstrdup_or_null(name);
1974 gs->path = xstrdup_or_null(path);
1975 gs->buf = NULL;
1976 gs->size = 0;
1977 gs->driver = NULL;
1978 switch (type) {
1980 case GREP_SOURCE_FILE:
1981 gs->identifier = xstrdup(identifier);
1982 break;
1983 case GREP_SOURCE_OID:
1984 gs->identifier = oiddup(identifier);
1985 break;
1986 case GREP_SOURCE_BUF:
1987 gs->identifier = NULL;
1988 break;
1989 }
1990}
1991void grep_source_clear(struct grep_source *gs)
1993{
1994 FREE_AND_NULL(gs->name);
1995 FREE_AND_NULL(gs->path);
1996 FREE_AND_NULL(gs->identifier);
1997 grep_source_clear_data(gs);
1998}
1999void grep_source_clear_data(struct grep_source *gs)
2001{
2002 switch (gs->type) {
2003 case GREP_SOURCE_FILE:
2004 case GREP_SOURCE_OID:
2005 FREE_AND_NULL(gs->buf);
2006 gs->size = 0;
2007 break;
2008 case GREP_SOURCE_BUF:
2009 /* leave user-provided buf intact */
2010 break;
2011 }
2012}
2013static int grep_source_load_oid(struct grep_source *gs)
2015{
2016 enum object_type type;
2017 grep_read_lock();
2019 gs->buf = read_object_file(gs->identifier, &type, &gs->size);
2020 grep_read_unlock();
2021 if (!gs->buf)
2023 return error(_("'%s': unable to read %s"),
2024 gs->name,
2025 oid_to_hex(gs->identifier));
2026 return 0;
2027}
2028static int grep_source_load_file(struct grep_source *gs)
2030{
2031 const char *filename = gs->identifier;
2032 struct stat st;
2033 char *data;
2034 size_t size;
2035 int i;
2036 if (lstat(filename, &st) < 0) {
2038 err_ret:
2039 if (errno != ENOENT)
2040 error_errno(_("failed to stat '%s'"), filename);
2041 return -1;
2042 }
2043 if (!S_ISREG(st.st_mode))
2044 return -1;
2045 size = xsize_t(st.st_size);
2046 i = open(filename, O_RDONLY);
2047 if (i < 0)
2048 goto err_ret;
2049 data = xmallocz(size);
2050 if (st.st_size != read_in_full(i, data, size)) {
2051 error_errno(_("'%s': short read"), filename);
2052 close(i);
2053 free(data);
2054 return -1;
2055 }
2056 close(i);
2057 gs->buf = data;
2059 gs->size = size;
2060 return 0;
2061}
2062static int grep_source_load(struct grep_source *gs)
2064{
2065 if (gs->buf)
2066 return 0;
2067 switch (gs->type) {
2069 case GREP_SOURCE_FILE:
2070 return grep_source_load_file(gs);
2071 case GREP_SOURCE_OID:
2072 return grep_source_load_oid(gs);
2073 case GREP_SOURCE_BUF:
2074 return gs->buf ? 0 : -1;
2075 }
2076 die("BUG: invalid grep_source type to load");
2077}
2078void grep_source_load_driver(struct grep_source *gs)
2080{
2081 if (gs->driver)
2082 return;
2083 grep_attr_lock();
2085 if (gs->path)
2086 gs->driver = userdiff_find_by_path(gs->path);
2087 if (!gs->driver)
2088 gs->driver = userdiff_find_by_name("default");
2089 grep_attr_unlock();
2090}
2091static int grep_source_is_binary(struct grep_source *gs)
2093{
2094 grep_source_load_driver(gs);
2095 if (gs->driver->binary != -1)
2096 return gs->driver->binary;
2097 if (!grep_source_load(gs))
2099 return buffer_is_binary(gs->buf, gs->size);
2100 return 0;
2102}