t5520: verify that `pull --rebase` shows the helpful advice when failing
[git/git.git] / grep.c
CommitLineData
83b5d2f5 1#include "cache.h"
83b5d2f5 2#include "grep.h"
60ecac98 3#include "userdiff.h"
6bfce93e 4#include "xdiff-interface.h"
335ec3bf
JK
5#include "diff.h"
6#include "diffcore.h"
5c1ebcca 7#include "commit.h"
793dc676 8#include "quote.h"
83b5d2f5 9
07a7d656
JH
10static int grep_source_load(struct grep_source *gs);
11static int grep_source_is_binary(struct grep_source *gs);
12
7687a054
JH
13static struct grep_opt grep_defaults;
14
15/*
16 * Initialize the grep_defaults template with hardcoded defaults.
17 * We could let the compiler do this, but without C99 initializers
18 * the code gets unwieldy and unreadable, so...
19 */
20void init_grep_defaults(void)
21{
22 struct grep_opt *opt = &grep_defaults;
918d4e1c
JH
23 static int run_once;
24
25 if (run_once)
26 return;
27 run_once++;
7687a054
JH
28
29 memset(opt, 0, sizeof(*opt));
30 opt->relative = 1;
31 opt->pathname = 1;
32 opt->regflags = REG_NEWLINE;
33 opt->max_depth = -1;
34 opt->pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
35 opt->extended_regexp_option = 0;
7ce4fb94
JK
36 color_set(opt->color_context, "");
37 color_set(opt->color_filename, "");
38 color_set(opt->color_function, "");
39 color_set(opt->color_lineno, "");
40 color_set(opt->color_match_context, GIT_COLOR_BOLD_RED);
41 color_set(opt->color_match_selected, GIT_COLOR_BOLD_RED);
42 color_set(opt->color_selected, "");
43 color_set(opt->color_sep, GIT_COLOR_CYAN);
7687a054
JH
44 opt->color = -1;
45}
46
47static int parse_pattern_type_arg(const char *opt, const char *arg)
48{
49 if (!strcmp(arg, "default"))
50 return GREP_PATTERN_TYPE_UNSPECIFIED;
51 else if (!strcmp(arg, "basic"))
52 return GREP_PATTERN_TYPE_BRE;
53 else if (!strcmp(arg, "extended"))
54 return GREP_PATTERN_TYPE_ERE;
55 else if (!strcmp(arg, "fixed"))
56 return GREP_PATTERN_TYPE_FIXED;
57 else if (!strcmp(arg, "perl"))
58 return GREP_PATTERN_TYPE_PCRE;
59 die("bad %s argument: %s", opt, arg);
60}
61
62/*
63 * Read the configuration file once and store it in
64 * the grep_defaults template.
65 */
66int grep_config(const char *var, const char *value, void *cb)
67{
68 struct grep_opt *opt = &grep_defaults;
69 char *color = NULL;
70
71 if (userdiff_config(var, value) < 0)
72 return -1;
73
74 if (!strcmp(var, "grep.extendedregexp")) {
75 if (git_config_bool(var, value))
76 opt->extended_regexp_option = 1;
77 else
78 opt->extended_regexp_option = 0;
79 return 0;
80 }
81
82 if (!strcmp(var, "grep.patterntype")) {
83 opt->pattern_type_option = parse_pattern_type_arg(var, value);
84 return 0;
85 }
86
87 if (!strcmp(var, "grep.linenumber")) {
88 opt->linenum = git_config_bool(var, value);
89 return 0;
90 }
91
6453f7b3
AS
92 if (!strcmp(var, "grep.fullname")) {
93 opt->relative = !git_config_bool(var, value);
94 return 0;
95 }
96
7687a054
JH
97 if (!strcmp(var, "color.grep"))
98 opt->color = git_config_colorbool(var, value);
99 else if (!strcmp(var, "color.grep.context"))
100 color = opt->color_context;
101 else if (!strcmp(var, "color.grep.filename"))
102 color = opt->color_filename;
103 else if (!strcmp(var, "color.grep.function"))
104 color = opt->color_function;
105 else if (!strcmp(var, "color.grep.linenumber"))
106 color = opt->color_lineno;
79a77109
RS
107 else if (!strcmp(var, "color.grep.matchcontext"))
108 color = opt->color_match_context;
109 else if (!strcmp(var, "color.grep.matchselected"))
110 color = opt->color_match_selected;
7687a054
JH
111 else if (!strcmp(var, "color.grep.selected"))
112 color = opt->color_selected;
113 else if (!strcmp(var, "color.grep.separator"))
114 color = opt->color_sep;
79a77109
RS
115 else if (!strcmp(var, "color.grep.match")) {
116 int rc = 0;
117 if (!value)
118 return config_error_nonbool(var);
bf1f639e
JH
119 rc |= color_parse(value, opt->color_match_context);
120 rc |= color_parse(value, opt->color_match_selected);
79a77109
RS
121 return rc;
122 }
7687a054
JH
123
124 if (color) {
125 if (!value)
126 return config_error_nonbool(var);
f6c5a296 127 return color_parse(value, color);
7687a054
JH
128 }
129 return 0;
130}
131
132/*
133 * Initialize one instance of grep_opt and copy the
134 * default values from the template we read the configuration
135 * information in an earlier call to git_config(grep_config).
136 */
137void grep_init(struct grep_opt *opt, const char *prefix)
138{
139 struct grep_opt *def = &grep_defaults;
140
141 memset(opt, 0, sizeof(*opt));
142 opt->prefix = prefix;
143 opt->prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
144 opt->pattern_tail = &opt->pattern_list;
145 opt->header_tail = &opt->header_list;
146
147 opt->color = def->color;
148 opt->extended_regexp_option = def->extended_regexp_option;
149 opt->pattern_type_option = def->pattern_type_option;
150 opt->linenum = def->linenum;
151 opt->max_depth = def->max_depth;
152 opt->pathname = def->pathname;
153 opt->regflags = def->regflags;
154 opt->relative = def->relative;
155
7ce4fb94
JK
156 color_set(opt->color_context, def->color_context);
157 color_set(opt->color_filename, def->color_filename);
158 color_set(opt->color_function, def->color_function);
159 color_set(opt->color_lineno, def->color_lineno);
160 color_set(opt->color_match_context, def->color_match_context);
161 color_set(opt->color_match_selected, def->color_match_selected);
162 color_set(opt->color_selected, def->color_selected);
163 color_set(opt->color_sep, def->color_sep);
7687a054 164}
07a7d656 165
c5c31d33
JH
166void grep_commit_pattern_type(enum grep_pattern_type pattern_type, struct grep_opt *opt)
167{
168 if (pattern_type != GREP_PATTERN_TYPE_UNSPECIFIED)
169 grep_set_pattern_type_option(pattern_type, opt);
170 else if (opt->pattern_type_option != GREP_PATTERN_TYPE_UNSPECIFIED)
171 grep_set_pattern_type_option(opt->pattern_type_option, opt);
172 else if (opt->extended_regexp_option)
173 grep_set_pattern_type_option(GREP_PATTERN_TYPE_ERE, opt);
174}
175
176void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, struct grep_opt *opt)
177{
178 switch (pattern_type) {
179 case GREP_PATTERN_TYPE_UNSPECIFIED:
180 /* fall through */
181
182 case GREP_PATTERN_TYPE_BRE:
183 opt->fixed = 0;
184 opt->pcre = 0;
185 opt->regflags &= ~REG_EXTENDED;
186 break;
187
188 case GREP_PATTERN_TYPE_ERE:
189 opt->fixed = 0;
190 opt->pcre = 0;
191 opt->regflags |= REG_EXTENDED;
192 break;
193
194 case GREP_PATTERN_TYPE_FIXED:
195 opt->fixed = 1;
196 opt->pcre = 0;
197 opt->regflags &= ~REG_EXTENDED;
198 break;
199
200 case GREP_PATTERN_TYPE_PCRE:
201 opt->fixed = 0;
202 opt->pcre = 1;
203 opt->regflags &= ~REG_EXTENDED;
204 break;
205 }
206}
207
fc456751
RS
208static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
209 const char *origin, int no,
210 enum grep_pat_token t,
211 enum grep_header_field field)
a4d7d2c6
JH
212{
213 struct grep_pat *p = xcalloc(1, sizeof(*p));
526a858a 214 p->pattern = xmemdupz(pat, patlen);
fc456751
RS
215 p->patternlen = patlen;
216 p->origin = origin;
217 p->no = no;
218 p->token = t;
a4d7d2c6 219 p->field = field;
fc456751
RS
220 return p;
221}
222
2b3873ff
RS
223static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
224{
225 **tail = p;
226 *tail = &p->next;
a4d7d2c6 227 p->next = NULL;
526a858a
RS
228
229 switch (p->token) {
230 case GREP_PATTERN: /* atom */
231 case GREP_PATTERN_HEAD:
232 case GREP_PATTERN_BODY:
233 for (;;) {
234 struct grep_pat *new_pat;
235 size_t len = 0;
236 char *cp = p->pattern + p->patternlen, *nl = NULL;
237 while (++len <= p->patternlen) {
238 if (*(--cp) == '\n') {
239 nl = cp;
240 break;
241 }
242 }
243 if (!nl)
244 break;
245 new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
246 p->no, p->token, p->field);
247 new_pat->next = p->next;
248 if (!p->next)
249 *tail = &new_pat->next;
250 p->next = new_pat;
251 *nl = '\0';
252 p->patternlen -= len;
253 }
254 break;
255 default:
256 break;
257 }
2b3873ff
RS
258}
259
fc456751
RS
260void append_header_grep_pattern(struct grep_opt *opt,
261 enum grep_header_field field, const char *pat)
262{
263 struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
264 GREP_PATTERN_HEAD, field);
baa6378f
JH
265 if (field == GREP_HEADER_REFLOG)
266 opt->use_reflog_filter = 1;
2b3873ff 267 do_append_grep_pat(&opt->header_tail, p);
a4d7d2c6
JH
268}
269
83b5d2f5
JH
270void append_grep_pattern(struct grep_opt *opt, const char *pat,
271 const char *origin, int no, enum grep_pat_token t)
ed40a095
RS
272{
273 append_grep_pat(opt, pat, strlen(pat), origin, no, t);
274}
275
276void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
277 const char *origin, int no, enum grep_pat_token t)
83b5d2f5 278{
fc456751 279 struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
2b3873ff 280 do_append_grep_pat(&opt->pattern_tail, p);
83b5d2f5
JH
281}
282
5b594f45
FK
283struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
284{
285 struct grep_pat *pat;
286 struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
287 *ret = *opt;
288
289 ret->pattern_list = NULL;
290 ret->pattern_tail = &ret->pattern_list;
291
292 for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
293 {
294 if(pat->token == GREP_PATTERN_HEAD)
295 append_header_grep_pattern(ret, pat->field,
296 pat->pattern);
297 else
ed40a095
RS
298 append_grep_pat(ret, pat->pattern, pat->patternlen,
299 pat->origin, pat->no, pat->token);
5b594f45
FK
300 }
301
302 return ret;
303}
304
a30c148a
MK
305static NORETURN void compile_regexp_failed(const struct grep_pat *p,
306 const char *error)
307{
308 char where[1024];
309
310 if (p->no)
19bdd3e7 311 xsnprintf(where, sizeof(where), "In '%s' at %d, ", p->origin, p->no);
a30c148a 312 else if (p->origin)
19bdd3e7 313 xsnprintf(where, sizeof(where), "%s, ", p->origin);
a30c148a
MK
314 else
315 where[0] = 0;
316
317 die("%s'%s': %s", where, p->pattern, error);
318}
319
63e7e9d8
MK
320#ifdef USE_LIBPCRE
321static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
322{
323 const char *error;
324 int erroffset;
fba4f125 325 int options = PCRE_MULTILINE;
63e7e9d8 326
9d9babb8
NTND
327 if (opt->ignore_case) {
328 if (has_non_ascii(p->pattern))
329 p->pcre_tables = pcre_maketables();
63e7e9d8 330 options |= PCRE_CASELESS;
9d9babb8 331 }
18547aac
NTND
332 if (is_utf8_locale() && has_non_ascii(p->pattern))
333 options |= PCRE_UTF8;
63e7e9d8
MK
334
335 p->pcre_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
9d9babb8 336 p->pcre_tables);
63e7e9d8
MK
337 if (!p->pcre_regexp)
338 compile_regexp_failed(p, error);
339
340 p->pcre_extra_info = pcre_study(p->pcre_regexp, 0, &error);
341 if (!p->pcre_extra_info && error)
342 die("%s", error);
343}
344
345static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
346 regmatch_t *match, int eflags)
347{
348 int ovector[30], ret, flags = 0;
349
350 if (eflags & REG_NOTBOL)
351 flags |= PCRE_NOTBOL;
352
353 ret = pcre_exec(p->pcre_regexp, p->pcre_extra_info, line, eol - line,
354 0, flags, ovector, ARRAY_SIZE(ovector));
355 if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
356 die("pcre_exec failed with error code %d", ret);
357 if (ret > 0) {
358 ret = 0;
359 match->rm_so = ovector[0];
360 match->rm_eo = ovector[1];
361 }
362
363 return ret;
364}
365
366static void free_pcre_regexp(struct grep_pat *p)
367{
368 pcre_free(p->pcre_regexp);
369 pcre_free(p->pcre_extra_info);
9d9babb8 370 pcre_free((void *)p->pcre_tables);
63e7e9d8
MK
371}
372#else /* !USE_LIBPCRE */
373static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
374{
375 die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
376}
377
378static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
379 regmatch_t *match, int eflags)
380{
381 return 1;
382}
383
384static void free_pcre_regexp(struct grep_pat *p)
385{
386}
387#endif /* !USE_LIBPCRE */
388
9eceddee
FK
389static int is_fixed(const char *s, size_t len)
390{
391 size_t i;
392
393 /* regcomp cannot accept patterns with NULs so we
394 * consider any pattern containing a NUL fixed.
395 */
396 if (memchr(s, 0, len))
397 return 1;
398
399 for (i = 0; i < len; i++) {
400 if (is_regex_special(s[i]))
401 return 0;
402 }
403
404 return 1;
405}
406
793dc676
NTND
407static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
408{
409 struct strbuf sb = STRBUF_INIT;
410 int err;
411 int regflags;
412
413 basic_regex_quote_buf(&sb, p->pattern);
414 regflags = opt->regflags & ~REG_EXTENDED;
415 if (opt->ignore_case)
416 regflags |= REG_ICASE;
417 err = regcomp(&p->regexp, sb.buf, regflags);
418 if (opt->debug)
419 fprintf(stderr, "fixed %s\n", sb.buf);
420 strbuf_release(&sb);
421 if (err) {
422 char errbuf[1024];
423 regerror(err, &p->regexp, errbuf, sizeof(errbuf));
424 regfree(&p->regexp);
425 compile_regexp_failed(p, errbuf);
426 }
427}
428
83b5d2f5
JH
429static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
430{
5c1ebcca 431 int icase, ascii_only;
c822255c
RS
432 int err;
433
d7eb527d 434 p->word_regexp = opt->word_regexp;
5183bf67 435 p->ignore_case = opt->ignore_case;
5c1ebcca
NTND
436 icase = opt->regflags & REG_ICASE || p->ignore_case;
437 ascii_only = !has_non_ascii(p->pattern);
d7eb527d 438
793dc676
NTND
439 /*
440 * Even when -F (fixed) asks us to do a non-regexp search, we
441 * may not be able to correctly case-fold when -i
442 * (ignore-case) is asked (in which case, we'll synthesize a
443 * regexp to match the pattern that matches regexp special
444 * characters literally, while ignoring case differences). On
445 * the other hand, even without -F, if the pattern does not
446 * have any regexp special characters and there is no need for
447 * case-folding search, we can internally turn it into a
448 * simple string match using kws. p->fixed tells us if we
449 * want to use kws.
450 */
9eceddee 451 if (opt->fixed || is_fixed(p->pattern, p->patternlen))
793dc676 452 p->fixed = !icase || ascii_only;
9eceddee
FK
453 else
454 p->fixed = 0;
455
456 if (p->fixed) {
695f95ba 457 p->kws = kwsalloc(icase ? tolower_trans_tbl : NULL);
9eceddee
FK
458 kwsincr(p->kws, p->pattern, p->patternlen);
459 kwsprep(p->kws);
c822255c 460 return;
793dc676
NTND
461 } else if (opt->fixed) {
462 /*
463 * We come here when the pattern has the non-ascii
464 * characters we cannot case-fold, and asked to
465 * ignore-case.
466 */
467 compile_fixed_regexp(p, opt);
468 return;
9eceddee 469 }
c822255c 470
63e7e9d8
MK
471 if (opt->pcre) {
472 compile_pcre_regexp(p, opt);
473 return;
474 }
475
c822255c 476 err = regcomp(&p->regexp, p->pattern, opt->regflags);
83b5d2f5
JH
477 if (err) {
478 char errbuf[1024];
83b5d2f5
JH
479 regerror(err, &p->regexp, errbuf, 1024);
480 regfree(&p->regexp);
a30c148a 481 compile_regexp_failed(p, errbuf);
83b5d2f5
JH
482 }
483}
484
0ab7befa 485static struct grep_expr *compile_pattern_or(struct grep_pat **);
83b5d2f5
JH
486static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
487{
488 struct grep_pat *p;
489 struct grep_expr *x;
490
491 p = *list;
c922b01f
LT
492 if (!p)
493 return NULL;
83b5d2f5
JH
494 switch (p->token) {
495 case GREP_PATTERN: /* atom */
480c1ca6
JH
496 case GREP_PATTERN_HEAD:
497 case GREP_PATTERN_BODY:
83b5d2f5
JH
498 x = xcalloc(1, sizeof (struct grep_expr));
499 x->node = GREP_NODE_ATOM;
500 x->u.atom = p;
501 *list = p->next;
502 return x;
503 case GREP_OPEN_PAREN:
504 *list = p->next;
0ab7befa 505 x = compile_pattern_or(list);
83b5d2f5
JH
506 if (!*list || (*list)->token != GREP_CLOSE_PAREN)
507 die("unmatched parenthesis");
508 *list = (*list)->next;
509 return x;
510 default:
511 return NULL;
512 }
513}
514
515static struct grep_expr *compile_pattern_not(struct grep_pat **list)
516{
517 struct grep_pat *p;
518 struct grep_expr *x;
519
520 p = *list;
c922b01f
LT
521 if (!p)
522 return NULL;
83b5d2f5
JH
523 switch (p->token) {
524 case GREP_NOT:
525 if (!p->next)
526 die("--not not followed by pattern expression");
527 *list = p->next;
528 x = xcalloc(1, sizeof (struct grep_expr));
529 x->node = GREP_NODE_NOT;
530 x->u.unary = compile_pattern_not(list);
531 if (!x->u.unary)
532 die("--not followed by non pattern expression");
533 return x;
534 default:
535 return compile_pattern_atom(list);
536 }
537}
538
539static struct grep_expr *compile_pattern_and(struct grep_pat **list)
540{
541 struct grep_pat *p;
542 struct grep_expr *x, *y, *z;
543
544 x = compile_pattern_not(list);
545 p = *list;
546 if (p && p->token == GREP_AND) {
547 if (!p->next)
548 die("--and not followed by pattern expression");
549 *list = p->next;
550 y = compile_pattern_and(list);
551 if (!y)
552 die("--and not followed by pattern expression");
553 z = xcalloc(1, sizeof (struct grep_expr));
554 z->node = GREP_NODE_AND;
555 z->u.binary.left = x;
556 z->u.binary.right = y;
557 return z;
558 }
559 return x;
560}
561
562static struct grep_expr *compile_pattern_or(struct grep_pat **list)
563{
564 struct grep_pat *p;
565 struct grep_expr *x, *y, *z;
566
567 x = compile_pattern_and(list);
568 p = *list;
569 if (x && p && p->token != GREP_CLOSE_PAREN) {
570 y = compile_pattern_or(list);
571 if (!y)
572 die("not a pattern expression %s", p->pattern);
573 z = xcalloc(1, sizeof (struct grep_expr));
574 z->node = GREP_NODE_OR;
575 z->u.binary.left = x;
576 z->u.binary.right = y;
577 return z;
578 }
579 return x;
580}
581
582static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
583{
584 return compile_pattern_or(list);
585}
586
17bf35a3
JH
587static void indent(int in)
588{
589 while (in-- > 0)
590 fputc(' ', stderr);
591}
592
593static void dump_grep_pat(struct grep_pat *p)
594{
595 switch (p->token) {
596 case GREP_AND: fprintf(stderr, "*and*"); break;
597 case GREP_OPEN_PAREN: fprintf(stderr, "*(*"); break;
598 case GREP_CLOSE_PAREN: fprintf(stderr, "*)*"); break;
599 case GREP_NOT: fprintf(stderr, "*not*"); break;
600 case GREP_OR: fprintf(stderr, "*or*"); break;
601
602 case GREP_PATTERN: fprintf(stderr, "pattern"); break;
603 case GREP_PATTERN_HEAD: fprintf(stderr, "pattern_head"); break;
604 case GREP_PATTERN_BODY: fprintf(stderr, "pattern_body"); break;
605 }
606
607 switch (p->token) {
608 default: break;
609 case GREP_PATTERN_HEAD:
610 fprintf(stderr, "<head %d>", p->field); break;
611 case GREP_PATTERN_BODY:
612 fprintf(stderr, "<body>"); break;
613 }
614 switch (p->token) {
615 default: break;
616 case GREP_PATTERN_HEAD:
617 case GREP_PATTERN_BODY:
618 case GREP_PATTERN:
619 fprintf(stderr, "%.*s", (int)p->patternlen, p->pattern);
620 break;
621 }
622 fputc('\n', stderr);
623}
624
625static void dump_grep_expression_1(struct grep_expr *x, int in)
626{
627 indent(in);
628 switch (x->node) {
629 case GREP_NODE_TRUE:
630 fprintf(stderr, "true\n");
631 break;
632 case GREP_NODE_ATOM:
633 dump_grep_pat(x->u.atom);
634 break;
635 case GREP_NODE_NOT:
636 fprintf(stderr, "(not\n");
637 dump_grep_expression_1(x->u.unary, in+1);
638 indent(in);
639 fprintf(stderr, ")\n");
640 break;
641 case GREP_NODE_AND:
642 fprintf(stderr, "(and\n");
643 dump_grep_expression_1(x->u.binary.left, in+1);
644 dump_grep_expression_1(x->u.binary.right, in+1);
645 indent(in);
646 fprintf(stderr, ")\n");
647 break;
648 case GREP_NODE_OR:
649 fprintf(stderr, "(or\n");
650 dump_grep_expression_1(x->u.binary.left, in+1);
651 dump_grep_expression_1(x->u.binary.right, in+1);
652 indent(in);
653 fprintf(stderr, ")\n");
654 break;
655 }
656}
657
07a7d656 658static void dump_grep_expression(struct grep_opt *opt)
17bf35a3
JH
659{
660 struct grep_expr *x = opt->pattern_expression;
661
662 if (opt->all_match)
663 fprintf(stderr, "[all-match]\n");
664 dump_grep_expression_1(x, 0);
665 fflush(NULL);
666}
667
5aaeb733
JH
668static struct grep_expr *grep_true_expr(void)
669{
670 struct grep_expr *z = xcalloc(1, sizeof(*z));
671 z->node = GREP_NODE_TRUE;
672 return z;
673}
674
675static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
676{
677 struct grep_expr *z = xcalloc(1, sizeof(*z));
678 z->node = GREP_NODE_OR;
679 z->u.binary.left = left;
680 z->u.binary.right = right;
681 return z;
682}
683
95ce9ce2 684static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
83b5d2f5
JH
685{
686 struct grep_pat *p;
95ce9ce2 687 struct grep_expr *header_expr;
5aaeb733
JH
688 struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
689 enum grep_header_field fld;
83b5d2f5 690
95ce9ce2
JH
691 if (!opt->header_list)
692 return NULL;
2385f246 693
95ce9ce2
JH
694 for (p = opt->header_list; p; p = p->next) {
695 if (p->token != GREP_PATTERN_HEAD)
696 die("bug: a non-header pattern in grep header list.");
3ce3ffb8
AP
697 if (p->field < GREP_HEADER_FIELD_MIN ||
698 GREP_HEADER_FIELD_MAX <= p->field)
95ce9ce2
JH
699 die("bug: unknown header field %d", p->field);
700 compile_regexp(p, opt);
80235ba7 701 }
5aaeb733
JH
702
703 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
704 header_group[fld] = NULL;
705
706 for (p = opt->header_list; p; p = p->next) {
707 struct grep_expr *h;
708 struct grep_pat *pp = p;
709
710 h = compile_pattern_atom(&pp);
711 if (!h || pp != p->next)
712 die("bug: malformed header expr");
713 if (!header_group[p->field]) {
714 header_group[p->field] = h;
715 continue;
716 }
717 header_group[p->field] = grep_or_expr(h, header_group[p->field]);
718 }
719
720 header_expr = NULL;
721
722 for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
723 if (!header_group[fld])
724 continue;
725 if (!header_expr)
726 header_expr = grep_true_expr();
727 header_expr = grep_or_expr(header_group[fld], header_expr);
728 }
95ce9ce2
JH
729 return header_expr;
730}
731
13e4fc7e
JH
732static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
733{
734 struct grep_expr *z = x;
735
736 while (x) {
737 assert(x->node == GREP_NODE_OR);
738 if (x->u.binary.right &&
739 x->u.binary.right->node == GREP_NODE_TRUE) {
740 x->u.binary.right = y;
741 break;
742 }
743 x = x->u.binary.right;
744 }
745 return z;
746}
747
17bf35a3 748static void compile_grep_patterns_real(struct grep_opt *opt)
95ce9ce2
JH
749{
750 struct grep_pat *p;
751 struct grep_expr *header_expr = prep_header_patterns(opt);
0ab7befa 752
83b5d2f5 753 for (p = opt->pattern_list; p; p = p->next) {
480c1ca6
JH
754 switch (p->token) {
755 case GREP_PATTERN: /* atom */
756 case GREP_PATTERN_HEAD:
757 case GREP_PATTERN_BODY:
c822255c 758 compile_regexp(p, opt);
480c1ca6
JH
759 break;
760 default:
83b5d2f5 761 opt->extended = 1;
480c1ca6
JH
762 break;
763 }
83b5d2f5
JH
764 }
765
80235ba7
JH
766 if (opt->all_match || header_expr)
767 opt->extended = 1;
17bf35a3 768 else if (!opt->extended && !opt->debug)
83b5d2f5
JH
769 return;
770
83b5d2f5 771 p = opt->pattern_list;
ba150a3f
MB
772 if (p)
773 opt->pattern_expression = compile_pattern_expr(&p);
83b5d2f5
JH
774 if (p)
775 die("incomplete pattern expression: %s", p->pattern);
80235ba7
JH
776
777 if (!header_expr)
778 return;
779
5aaeb733 780 if (!opt->pattern_expression)
80235ba7 781 opt->pattern_expression = header_expr;
13e4fc7e
JH
782 else if (opt->all_match)
783 opt->pattern_expression = grep_splice_or(header_expr,
784 opt->pattern_expression);
5aaeb733
JH
785 else
786 opt->pattern_expression = grep_or_expr(opt->pattern_expression,
787 header_expr);
80235ba7 788 opt->all_match = 1;
83b5d2f5
JH
789}
790
17bf35a3
JH
791void compile_grep_patterns(struct grep_opt *opt)
792{
793 compile_grep_patterns_real(opt);
794 if (opt->debug)
795 dump_grep_expression(opt);
796}
797
b48fb5b6
JH
798static void free_pattern_expr(struct grep_expr *x)
799{
800 switch (x->node) {
5aaeb733 801 case GREP_NODE_TRUE:
b48fb5b6
JH
802 case GREP_NODE_ATOM:
803 break;
804 case GREP_NODE_NOT:
805 free_pattern_expr(x->u.unary);
806 break;
807 case GREP_NODE_AND:
808 case GREP_NODE_OR:
809 free_pattern_expr(x->u.binary.left);
810 free_pattern_expr(x->u.binary.right);
811 break;
812 }
813 free(x);
814}
815
816void free_grep_patterns(struct grep_opt *opt)
817{
818 struct grep_pat *p, *n;
819
820 for (p = opt->pattern_list; p; p = n) {
821 n = p->next;
822 switch (p->token) {
823 case GREP_PATTERN: /* atom */
824 case GREP_PATTERN_HEAD:
825 case GREP_PATTERN_BODY:
9eceddee
FK
826 if (p->kws)
827 kwsfree(p->kws);
828 else if (p->pcre_regexp)
63e7e9d8
MK
829 free_pcre_regexp(p);
830 else
831 regfree(&p->regexp);
526a858a 832 free(p->pattern);
b48fb5b6
JH
833 break;
834 default:
835 break;
836 }
837 free(p);
838 }
839
840 if (!opt->extended)
841 return;
842 free_pattern_expr(opt->pattern_expression);
843}
844
83b5d2f5
JH
845static char *end_of_line(char *cp, unsigned long *left)
846{
847 unsigned long l = *left;
848 while (l && *cp != '\n') {
849 l--;
850 cp++;
851 }
852 *left = l;
853 return cp;
854}
855
856static int word_char(char ch)
857{
858 return isalnum(ch) || ch == '_';
859}
860
55f638bd
ML
861static void output_color(struct grep_opt *opt, const void *data, size_t size,
862 const char *color)
863{
daa0c3d9 864 if (want_color(opt->color) && color && color[0]) {
55f638bd
ML
865 opt->output(opt, color, strlen(color));
866 opt->output(opt, data, size);
867 opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
868 } else
869 opt->output(opt, data, size);
870}
871
872static void output_sep(struct grep_opt *opt, char sign)
873{
874 if (opt->null_following_name)
875 opt->output(opt, "\0", 1);
876 else
877 output_color(opt, &sign, 1, opt->color_sep);
878}
879
83caecca
RZ
880static void show_name(struct grep_opt *opt, const char *name)
881{
55f638bd 882 output_color(opt, name, strlen(name), opt->color_filename);
5b594f45 883 opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
83caecca
RZ
884}
885
ed40a095
RS
886static int fixmatch(struct grep_pat *p, char *line, char *eol,
887 regmatch_t *match)
83b5d2f5 888{
9eceddee
FK
889 struct kwsmatch kwsm;
890 size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
891 if (offset == -1) {
83b5d2f5
JH
892 match->rm_so = match->rm_eo = -1;
893 return REG_NOMATCH;
9eceddee
FK
894 } else {
895 match->rm_so = offset;
896 match->rm_eo = match->rm_so + kwsm.size[0];
83b5d2f5
JH
897 return 0;
898 }
899}
900
f96e5673
RS
901static int regmatch(const regex_t *preg, char *line, char *eol,
902 regmatch_t *match, int eflags)
903{
904#ifdef REG_STARTEND
905 match->rm_so = 0;
906 match->rm_eo = eol - line;
907 eflags |= REG_STARTEND;
908#endif
909 return regexec(preg, line, 1, match, eflags);
910}
911
97e77784
MK
912static int patmatch(struct grep_pat *p, char *line, char *eol,
913 regmatch_t *match, int eflags)
914{
915 int hit;
916
917 if (p->fixed)
918 hit = !fixmatch(p, line, eol, match);
63e7e9d8
MK
919 else if (p->pcre_regexp)
920 hit = !pcrematch(p, line, eol, match, eflags);
97e77784
MK
921 else
922 hit = !regmatch(&p->regexp, line, eol, match, eflags);
923
924 return hit;
925}
926
a4d7d2c6
JH
927static int strip_timestamp(char *bol, char **eol_p)
928{
929 char *eol = *eol_p;
930 int ch;
931
932 while (bol < --eol) {
933 if (*eol != '>')
934 continue;
935 *eol_p = ++eol;
936 ch = *eol;
937 *eol = '\0';
938 return ch;
939 }
940 return 0;
941}
942
943static struct {
944 const char *field;
945 size_t len;
946} header_field[] = {
947 { "author ", 7 },
948 { "committer ", 10 },
72fd13f7 949 { "reflog ", 7 },
a4d7d2c6
JH
950};
951
d7eb527d 952static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
79212772
RS
953 enum grep_context ctx,
954 regmatch_t *pmatch, int eflags)
83b5d2f5
JH
955{
956 int hit = 0;
a4d7d2c6 957 int saved_ch = 0;
e701fadb 958 const char *start = bol;
83b5d2f5 959
480c1ca6
JH
960 if ((p->token != GREP_PATTERN) &&
961 ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
962 return 0;
963
a4d7d2c6
JH
964 if (p->token == GREP_PATTERN_HEAD) {
965 const char *field;
966 size_t len;
967 assert(p->field < ARRAY_SIZE(header_field));
968 field = header_field[p->field].field;
969 len = header_field[p->field].len;
970 if (strncmp(bol, field, len))
971 return 0;
972 bol += len;
ad4813b3
NTND
973 switch (p->field) {
974 case GREP_HEADER_AUTHOR:
975 case GREP_HEADER_COMMITTER:
976 saved_ch = strip_timestamp(bol, &eol);
977 break;
978 default:
979 break;
980 }
a4d7d2c6
JH
981 }
982
83b5d2f5 983 again:
97e77784 984 hit = patmatch(p, bol, eol, pmatch, eflags);
83b5d2f5 985
d7eb527d 986 if (hit && p->word_regexp) {
83b5d2f5 987 if ((pmatch[0].rm_so < 0) ||
84201eae 988 (eol - bol) < pmatch[0].rm_so ||
83b5d2f5
JH
989 (pmatch[0].rm_eo < 0) ||
990 (eol - bol) < pmatch[0].rm_eo)
991 die("regexp returned nonsense");
992
993 /* Match beginning must be either beginning of the
994 * line, or at word boundary (i.e. the last char must
995 * not be a word char). Similarly, match end must be
996 * either end of the line, or at word boundary
997 * (i.e. the next char must not be a word char).
998 */
fb62eb7f 999 if ( ((pmatch[0].rm_so == 0) ||
83b5d2f5
JH
1000 !word_char(bol[pmatch[0].rm_so-1])) &&
1001 ((pmatch[0].rm_eo == (eol-bol)) ||
1002 !word_char(bol[pmatch[0].rm_eo])) )
1003 ;
1004 else
1005 hit = 0;
1006
84201eae
RS
1007 /* Words consist of at least one character. */
1008 if (pmatch->rm_so == pmatch->rm_eo)
1009 hit = 0;
1010
83b5d2f5
JH
1011 if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
1012 /* There could be more than one match on the
1013 * line, and the first match might not be
1014 * strict word match. But later ones could be!
fb62eb7f
RS
1015 * Forward to the next possible start, i.e. the
1016 * next position following a non-word char.
83b5d2f5
JH
1017 */
1018 bol = pmatch[0].rm_so + bol + 1;
fb62eb7f
RS
1019 while (word_char(bol[-1]) && bol < eol)
1020 bol++;
dbb6a4ad 1021 eflags |= REG_NOTBOL;
fb62eb7f
RS
1022 if (bol < eol)
1023 goto again;
83b5d2f5
JH
1024 }
1025 }
a4d7d2c6
JH
1026 if (p->token == GREP_PATTERN_HEAD && saved_ch)
1027 *eol = saved_ch;
e701fadb
RS
1028 if (hit) {
1029 pmatch[0].rm_so += bol - start;
1030 pmatch[0].rm_eo += bol - start;
1031 }
83b5d2f5
JH
1032 return hit;
1033}
1034
d7eb527d
RS
1035static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
1036 enum grep_context ctx, int collect_hits)
83b5d2f5 1037{
0ab7befa 1038 int h = 0;
79212772 1039 regmatch_t match;
0ab7befa 1040
c922b01f
LT
1041 if (!x)
1042 die("Not a valid grep expression");
83b5d2f5 1043 switch (x->node) {
5aaeb733
JH
1044 case GREP_NODE_TRUE:
1045 h = 1;
1046 break;
83b5d2f5 1047 case GREP_NODE_ATOM:
79212772 1048 h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
83b5d2f5
JH
1049 break;
1050 case GREP_NODE_NOT:
d7eb527d 1051 h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
0ab7befa 1052 break;
83b5d2f5 1053 case GREP_NODE_AND:
d7eb527d 1054 if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
252d560d 1055 return 0;
d7eb527d 1056 h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
0ab7befa 1057 break;
83b5d2f5 1058 case GREP_NODE_OR:
0ab7befa 1059 if (!collect_hits)
d7eb527d 1060 return (match_expr_eval(x->u.binary.left,
0ab7befa 1061 bol, eol, ctx, 0) ||
d7eb527d 1062 match_expr_eval(x->u.binary.right,
0ab7befa 1063 bol, eol, ctx, 0));
d7eb527d 1064 h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
0ab7befa 1065 x->u.binary.left->hit |= h;
d7eb527d 1066 h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
0ab7befa
JH
1067 break;
1068 default:
d7530708 1069 die("Unexpected node type (internal error) %d", x->node);
83b5d2f5 1070 }
0ab7befa
JH
1071 if (collect_hits)
1072 x->hit |= h;
1073 return h;
83b5d2f5
JH
1074}
1075
480c1ca6 1076static int match_expr(struct grep_opt *opt, char *bol, char *eol,
0ab7befa 1077 enum grep_context ctx, int collect_hits)
83b5d2f5
JH
1078{
1079 struct grep_expr *x = opt->pattern_expression;
d7eb527d 1080 return match_expr_eval(x, bol, eol, ctx, collect_hits);
83b5d2f5
JH
1081}
1082
480c1ca6 1083static int match_line(struct grep_opt *opt, char *bol, char *eol,
0ab7befa 1084 enum grep_context ctx, int collect_hits)
83b5d2f5
JH
1085{
1086 struct grep_pat *p;
79212772
RS
1087 regmatch_t match;
1088
83b5d2f5 1089 if (opt->extended)
0ab7befa
JH
1090 return match_expr(opt, bol, eol, ctx, collect_hits);
1091
1092 /* we do not call with collect_hits without being extended */
83b5d2f5 1093 for (p = opt->pattern_list; p; p = p->next) {
79212772 1094 if (match_one_pattern(p, bol, eol, ctx, &match, 0))
83b5d2f5
JH
1095 return 1;
1096 }
1097 return 0;
1098}
1099
7e8f59d5
RS
1100static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
1101 enum grep_context ctx,
1102 regmatch_t *pmatch, int eflags)
1103{
1104 regmatch_t match;
1105
1106 if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
1107 return 0;
1108 if (match.rm_so < 0 || match.rm_eo < 0)
1109 return 0;
1110 if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
1111 if (match.rm_so > pmatch->rm_so)
1112 return 1;
1113 if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
1114 return 1;
1115 }
1116 pmatch->rm_so = match.rm_so;
1117 pmatch->rm_eo = match.rm_eo;
1118 return 1;
1119}
1120
1121static int next_match(struct grep_opt *opt, char *bol, char *eol,
1122 enum grep_context ctx, regmatch_t *pmatch, int eflags)
1123{
1124 struct grep_pat *p;
1125 int hit = 0;
1126
1127 pmatch->rm_so = pmatch->rm_eo = -1;
1128 if (bol < eol) {
1129 for (p = opt->pattern_list; p; p = p->next) {
1130 switch (p->token) {
1131 case GREP_PATTERN: /* atom */
1132 case GREP_PATTERN_HEAD:
1133 case GREP_PATTERN_BODY:
1134 hit |= match_next_pattern(p, bol, eol, ctx,
1135 pmatch, eflags);
1136 break;
1137 default:
1138 break;
1139 }
1140 }
1141 }
1142 return hit;
1143}
1144
1145static void show_line(struct grep_opt *opt, char *bol, char *eol,
1146 const char *name, unsigned lno, char sign)
1147{
1148 int rest = eol - bol;
79a77109 1149 const char *match_color, *line_color = NULL;
7e8f59d5 1150
a8f0e764
RS
1151 if (opt->file_break && opt->last_shown == 0) {
1152 if (opt->show_hunk_mark)
1153 opt->output(opt, "\n", 1);
ba8ea749 1154 } else if (opt->pre_context || opt->post_context || opt->funcbody) {
046802d0 1155 if (opt->last_shown == 0) {
55f638bd
ML
1156 if (opt->show_hunk_mark) {
1157 output_color(opt, "--", 2, opt->color_sep);
1158 opt->output(opt, "\n", 1);
07b838f0 1159 }
55f638bd
ML
1160 } else if (lno > opt->last_shown + 1) {
1161 output_color(opt, "--", 2, opt->color_sep);
1162 opt->output(opt, "\n", 1);
1163 }
5dd06d38 1164 }
1d84f72e
RS
1165 if (opt->heading && opt->last_shown == 0) {
1166 output_color(opt, name, strlen(name), opt->color_filename);
1167 opt->output(opt, "\n", 1);
1168 }
5dd06d38
RS
1169 opt->last_shown = lno;
1170
1d84f72e 1171 if (!opt->heading && opt->pathname) {
55f638bd
ML
1172 output_color(opt, name, strlen(name), opt->color_filename);
1173 output_sep(opt, sign);
5b594f45
FK
1174 }
1175 if (opt->linenum) {
1176 char buf[32];
1177 snprintf(buf, sizeof(buf), "%d", lno);
55f638bd
ML
1178 output_color(opt, buf, strlen(buf), opt->color_lineno);
1179 output_sep(opt, sign);
5b594f45 1180 }
7e8f59d5
RS
1181 if (opt->color) {
1182 regmatch_t match;
1183 enum grep_context ctx = GREP_CONTEXT_BODY;
1184 int ch = *eol;
1185 int eflags = 0;
1186
79a77109
RS
1187 if (sign == ':')
1188 match_color = opt->color_match_selected;
1189 else
1190 match_color = opt->color_match_context;
00588bb5
ML
1191 if (sign == ':')
1192 line_color = opt->color_selected;
1193 else if (sign == '-')
1194 line_color = opt->color_context;
1195 else if (sign == '=')
1196 line_color = opt->color_function;
7e8f59d5
RS
1197 *eol = '\0';
1198 while (next_match(opt, bol, eol, ctx, &match, eflags)) {
1f5b9cc4
RS
1199 if (match.rm_so == match.rm_eo)
1200 break;
5b594f45 1201
00588bb5 1202 output_color(opt, bol, match.rm_so, line_color);
55f638bd 1203 output_color(opt, bol + match.rm_so,
79a77109 1204 match.rm_eo - match.rm_so, match_color);
7e8f59d5
RS
1205 bol += match.rm_eo;
1206 rest -= match.rm_eo;
1207 eflags = REG_NOTBOL;
1208 }
1209 *eol = ch;
1210 }
00588bb5 1211 output_color(opt, bol, rest, line_color);
5b594f45 1212 opt->output(opt, "\n", 1);
7e8f59d5
RS
1213}
1214
0579f91d 1215#ifndef NO_PTHREADS
78db6ea9
JK
1216int grep_use_locks;
1217
0579f91d
TR
1218/*
1219 * This lock protects access to the gitattributes machinery, which is
1220 * not thread-safe.
1221 */
1222pthread_mutex_t grep_attr_mutex;
1223
78db6ea9 1224static inline void grep_attr_lock(void)
0579f91d 1225{
78db6ea9 1226 if (grep_use_locks)
0579f91d
TR
1227 pthread_mutex_lock(&grep_attr_mutex);
1228}
1229
78db6ea9 1230static inline void grep_attr_unlock(void)
0579f91d 1231{
78db6ea9 1232 if (grep_use_locks)
0579f91d
TR
1233 pthread_mutex_unlock(&grep_attr_mutex);
1234}
b3aeb285
JK
1235
1236/*
1237 * Same as git_attr_mutex, but protecting the thread-unsafe object db access.
1238 */
1239pthread_mutex_t grep_read_mutex;
1240
0579f91d 1241#else
78db6ea9
JK
1242#define grep_attr_lock()
1243#define grep_attr_unlock()
0579f91d
TR
1244#endif
1245
e1327023 1246static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
2944e4e6 1247{
60ecac98 1248 xdemitconf_t *xecfg = opt->priv;
0579f91d 1249 if (xecfg && !xecfg->find_func) {
94ad9d9e
JK
1250 grep_source_load_driver(gs);
1251 if (gs->driver->funcname.pattern) {
1252 const struct userdiff_funcname *pe = &gs->driver->funcname;
0579f91d
TR
1253 xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
1254 } else {
1255 xecfg = opt->priv = NULL;
1256 }
1257 }
1258
1259 if (xecfg) {
60ecac98
RS
1260 char buf[1];
1261 return xecfg->find_func(bol, eol - bol, buf, 1,
1262 xecfg->find_func_priv) >= 0;
1263 }
1264
2944e4e6
RS
1265 if (bol == eol)
1266 return 0;
1267 if (isalpha(*bol) || *bol == '_' || *bol == '$')
1268 return 1;
1269 return 0;
1270}
1271
e1327023
JK
1272static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
1273 char *bol, unsigned lno)
2944e4e6 1274{
e1327023 1275 while (bol > gs->buf) {
2944e4e6
RS
1276 char *eol = --bol;
1277
e1327023 1278 while (bol > gs->buf && bol[-1] != '\n')
2944e4e6
RS
1279 bol--;
1280 lno--;
1281
1282 if (lno <= opt->last_shown)
1283 break;
1284
e1327023
JK
1285 if (match_funcname(opt, gs, bol, eol)) {
1286 show_line(opt, bol, eol, gs->name, lno, '=');
2944e4e6
RS
1287 break;
1288 }
1289 }
1290}
1291
e1327023 1292static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
ba8ea749 1293 char *bol, char *end, unsigned lno)
49de3216 1294{
2944e4e6 1295 unsigned cur = lno, from = 1, funcname_lno = 0;
ba8ea749
RS
1296 int funcname_needed = !!opt->funcname;
1297
e1327023 1298 if (opt->funcbody && !match_funcname(opt, gs, bol, end))
ba8ea749 1299 funcname_needed = 2;
49de3216
RS
1300
1301 if (opt->pre_context < lno)
1302 from = lno - opt->pre_context;
1303 if (from <= opt->last_shown)
1304 from = opt->last_shown + 1;
1305
1306 /* Rewind. */
e1327023 1307 while (bol > gs->buf &&
ba8ea749 1308 cur > (funcname_needed == 2 ? opt->last_shown + 1 : from)) {
2944e4e6
RS
1309 char *eol = --bol;
1310
e1327023 1311 while (bol > gs->buf && bol[-1] != '\n')
49de3216
RS
1312 bol--;
1313 cur--;
e1327023 1314 if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
2944e4e6
RS
1315 funcname_lno = cur;
1316 funcname_needed = 0;
1317 }
49de3216
RS
1318 }
1319
2944e4e6
RS
1320 /* We need to look even further back to find a function signature. */
1321 if (opt->funcname && funcname_needed)
e1327023 1322 show_funcname_line(opt, gs, bol, cur);
2944e4e6 1323
49de3216
RS
1324 /* Back forward. */
1325 while (cur < lno) {
2944e4e6 1326 char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
49de3216
RS
1327
1328 while (*eol != '\n')
1329 eol++;
e1327023 1330 show_line(opt, bol, eol, gs->name, cur, sign);
49de3216
RS
1331 bol = eol + 1;
1332 cur++;
1333 }
1334}
1335
a26345b6
JH
1336static int should_lookahead(struct grep_opt *opt)
1337{
1338 struct grep_pat *p;
1339
1340 if (opt->extended)
1341 return 0; /* punt for too complex stuff */
1342 if (opt->invert)
1343 return 0;
1344 for (p = opt->pattern_list; p; p = p->next) {
1345 if (p->token != GREP_PATTERN)
1346 return 0; /* punt for "header only" and stuff */
1347 }
1348 return 1;
1349}
1350
1351static int look_ahead(struct grep_opt *opt,
1352 unsigned long *left_p,
1353 unsigned *lno_p,
1354 char **bol_p)
1355{
1356 unsigned lno = *lno_p;
1357 char *bol = *bol_p;
1358 struct grep_pat *p;
1359 char *sp, *last_bol;
1360 regoff_t earliest = -1;
1361
1362 for (p = opt->pattern_list; p; p = p->next) {
1363 int hit;
1364 regmatch_t m;
1365
97e77784 1366 hit = patmatch(p, bol, bol + *left_p, &m, 0);
a26345b6
JH
1367 if (!hit || m.rm_so < 0 || m.rm_eo < 0)
1368 continue;
1369 if (earliest < 0 || m.rm_so < earliest)
1370 earliest = m.rm_so;
1371 }
1372
1373 if (earliest < 0) {
1374 *bol_p = bol + *left_p;
1375 *left_p = 0;
1376 return 1;
1377 }
1378 for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
1379 ; /* find the beginning of the line */
1380 last_bol = sp;
1381
1382 for (sp = bol; sp < last_bol; sp++) {
1383 if (*sp == '\n')
1384 lno++;
1385 }
1386 *left_p -= last_bol - bol;
1387 *bol_p = last_bol;
1388 *lno_p = lno;
1389 return 0;
1390}
1391
5b594f45
FK
1392static void std_output(struct grep_opt *opt, const void *buf, size_t size)
1393{
1394 fwrite(buf, size, 1, stdout);
1395}
1396
335ec3bf
JK
1397static int fill_textconv_grep(struct userdiff_driver *driver,
1398 struct grep_source *gs)
1399{
1400 struct diff_filespec *df;
1401 char *buf;
1402 size_t size;
1403
1404 if (!driver || !driver->textconv)
1405 return grep_source_load(gs);
1406
1407 /*
1408 * The textconv interface is intimately tied to diff_filespecs, so we
1409 * have to pretend to be one. If we could unify the grep_source
1410 * and diff_filespec structs, this mess could just go away.
1411 */
1412 df = alloc_filespec(gs->path);
1413 switch (gs->type) {
1414 case GREP_SOURCE_SHA1:
1415 fill_filespec(df, gs->identifier, 1, 0100644);
1416 break;
1417 case GREP_SOURCE_FILE:
1418 fill_filespec(df, null_sha1, 0, 0100644);
1419 break;
1420 default:
1421 die("BUG: attempt to textconv something without a path?");
1422 }
1423
1424 /*
1425 * fill_textconv is not remotely thread-safe; it may load objects
1426 * behind the scenes, and it modifies the global diff tempfile
1427 * structure.
1428 */
1429 grep_read_lock();
1430 size = fill_textconv(driver, df, &buf);
1431 grep_read_unlock();
1432 free_filespec(df);
1433
1434 /*
1435 * The normal fill_textconv usage by the diff machinery would just keep
1436 * the textconv'd buf separate from the diff_filespec. But much of the
1437 * grep code passes around a grep_source and assumes that its "buf"
1438 * pointer is the beginning of the thing we are searching. So let's
1439 * install our textconv'd version into the grep_source, taking care not
1440 * to leak any existing buffer.
1441 */
1442 grep_source_clear_data(gs);
1443 gs->buf = buf;
1444 gs->size = size;
1445
1446 return 0;
1447}
1448
4aa2c475
RS
1449static int is_empty_line(const char *bol, const char *eol)
1450{
1451 while (bol < eol && isspace(*bol))
1452 bol++;
1453 return bol == eol;
1454}
1455
e1327023 1456static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
83b5d2f5 1457{
e1327023 1458 char *bol;
4aa2c475 1459 char *peek_bol = NULL;
e1327023 1460 unsigned long left;
83b5d2f5 1461 unsigned lno = 1;
83b5d2f5 1462 unsigned last_hit = 0;
83b5d2f5 1463 int binary_match_only = 0;
83b5d2f5 1464 unsigned count = 0;
a26345b6 1465 int try_lookahead = 0;
ba8ea749 1466 int show_function = 0;
335ec3bf 1467 struct userdiff_driver *textconv = NULL;
480c1ca6 1468 enum grep_context ctx = GREP_CONTEXT_HEAD;
60ecac98 1469 xdemitconf_t xecfg;
83b5d2f5 1470
5b594f45
FK
1471 if (!opt->output)
1472 opt->output = std_output;
1473
ba8ea749
RS
1474 if (opt->pre_context || opt->post_context || opt->file_break ||
1475 opt->funcbody) {
08303c36
RS
1476 /* Show hunk marks, except for the first file. */
1477 if (opt->last_shown)
1478 opt->show_hunk_mark = 1;
1479 /*
1480 * If we're using threads then we can't easily identify
1481 * the first file. Always put hunk marks in that case
1482 * and skip the very first one later in work_done().
1483 */
1484 if (opt->output != std_output)
1485 opt->show_hunk_mark = 1;
1486 }
431d6e7b
RS
1487 opt->last_shown = 0;
1488
335ec3bf
JK
1489 if (opt->allow_textconv) {
1490 grep_source_load_driver(gs);
1491 /*
1492 * We might set up the shared textconv cache data here, which
1493 * is not thread-safe.
1494 */
1495 grep_attr_lock();
1496 textconv = userdiff_get_textconv(gs->driver);
1497 grep_attr_unlock();
1498 }
1499
1500 /*
1501 * We know the result of a textconv is text, so we only have to care
1502 * about binary handling if we are not using it.
1503 */
1504 if (!textconv) {
1505 switch (opt->binary) {
1506 case GREP_BINARY_DEFAULT:
1507 if (grep_source_is_binary(gs))
1508 binary_match_only = 1;
1509 break;
1510 case GREP_BINARY_NOMATCH:
1511 if (grep_source_is_binary(gs))
1512 return 0; /* Assume unmatch */
1513 break;
1514 case GREP_BINARY_TEXT:
1515 break;
1516 default:
1517 die("bug: unknown binary handling mode");
1518 }
83b5d2f5
JH
1519 }
1520
60ecac98 1521 memset(&xecfg, 0, sizeof(xecfg));
0579f91d
TR
1522 opt->priv = &xecfg;
1523
a26345b6 1524 try_lookahead = should_lookahead(opt);
60ecac98 1525
335ec3bf 1526 if (fill_textconv_grep(textconv, gs) < 0)
08265798
JK
1527 return 0;
1528
e1327023
JK
1529 bol = gs->buf;
1530 left = gs->size;
83b5d2f5
JH
1531 while (left) {
1532 char *eol, ch;
0ab7befa 1533 int hit;
83b5d2f5 1534
a26345b6 1535 /*
8997da38 1536 * look_ahead() skips quickly to the line that possibly
a26345b6
JH
1537 * has the next hit; don't call it if we need to do
1538 * something more than just skipping the current line
1539 * in response to an unmatch for the current line. E.g.
1540 * inside a post-context window, we will show the current
1541 * line as a context around the previous hit when it
1542 * doesn't hit.
1543 */
1544 if (try_lookahead
1545 && !(last_hit
ba8ea749
RS
1546 && (show_function ||
1547 lno <= last_hit + opt->post_context))
a26345b6
JH
1548 && look_ahead(opt, &left, &lno, &bol))
1549 break;
83b5d2f5
JH
1550 eol = end_of_line(bol, &left);
1551 ch = *eol;
1552 *eol = 0;
1553
480c1ca6
JH
1554 if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
1555 ctx = GREP_CONTEXT_BODY;
1556
0ab7befa 1557 hit = match_line(opt, bol, eol, ctx, collect_hits);
83b5d2f5
JH
1558 *eol = ch;
1559
0ab7befa
JH
1560 if (collect_hits)
1561 goto next_line;
1562
83b5d2f5
JH
1563 /* "grep -v -e foo -e bla" should list lines
1564 * that do not have either, so inversion should
1565 * be done outside.
1566 */
1567 if (opt->invert)
1568 hit = !hit;
1569 if (opt->unmatch_name_only) {
1570 if (hit)
1571 return 0;
1572 goto next_line;
1573 }
1574 if (hit) {
1575 count++;
1576 if (opt->status_only)
1577 return 1;
321ffcc0 1578 if (opt->name_only) {
e1327023 1579 show_name(opt, gs->name);
321ffcc0
RS
1580 return 1;
1581 }
c30c10cf
RS
1582 if (opt->count)
1583 goto next_line;
83b5d2f5 1584 if (binary_match_only) {
5b594f45 1585 opt->output(opt, "Binary file ", 12);
e1327023 1586 output_color(opt, gs->name, strlen(gs->name),
55f638bd 1587 opt->color_filename);
5b594f45 1588 opt->output(opt, " matches\n", 9);
83b5d2f5
JH
1589 return 1;
1590 }
83b5d2f5
JH
1591 /* Hit at this line. If we haven't shown the
1592 * pre-context lines, we would need to show them.
83b5d2f5 1593 */
ba8ea749 1594 if (opt->pre_context || opt->funcbody)
e1327023 1595 show_pre_context(opt, gs, bol, eol, lno);
2944e4e6 1596 else if (opt->funcname)
e1327023
JK
1597 show_funcname_line(opt, gs, bol, lno);
1598 show_line(opt, bol, eol, gs->name, lno, ':');
5dd06d38 1599 last_hit = lno;
ba8ea749
RS
1600 if (opt->funcbody)
1601 show_function = 1;
1602 goto next_line;
83b5d2f5 1603 }
4aa2c475
RS
1604 if (show_function && (!peek_bol || peek_bol < bol)) {
1605 unsigned long peek_left = left;
1606 char *peek_eol = eol;
1607
1608 /*
1609 * Trailing empty lines are not interesting.
1610 * Peek past them to see if they belong to the
1611 * body of the current function.
1612 */
1613 peek_bol = bol;
1614 while (is_empty_line(peek_bol, peek_eol)) {
1615 peek_bol = peek_eol + 1;
1616 peek_eol = end_of_line(peek_bol, &peek_left);
1617 }
1618
1619 if (match_funcname(opt, gs, peek_bol, peek_eol))
1620 show_function = 0;
1621 }
ba8ea749
RS
1622 if (show_function ||
1623 (last_hit && lno <= last_hit + opt->post_context)) {
83b5d2f5
JH
1624 /* If the last hit is within the post context,
1625 * we need to show this line.
1626 */
e1327023 1627 show_line(opt, bol, eol, gs->name, lno, '-');
83b5d2f5 1628 }
83b5d2f5
JH
1629
1630 next_line:
1631 bol = eol + 1;
1632 if (!left)
1633 break;
1634 left--;
1635 lno++;
1636 }
1637
0ab7befa
JH
1638 if (collect_hits)
1639 return 0;
b48fb5b6 1640
83b5d2f5
JH
1641 if (opt->status_only)
1642 return 0;
1643 if (opt->unmatch_name_only) {
1644 /* We did not see any hit, so we want to show this */
e1327023 1645 show_name(opt, gs->name);
83b5d2f5
JH
1646 return 1;
1647 }
1648
60ecac98
RS
1649 xdiff_clear_find_func(&xecfg);
1650 opt->priv = NULL;
1651
83b5d2f5
JH
1652 /* NEEDSWORK:
1653 * The real "grep -c foo *.c" gives many "bar.c:0" lines,
1654 * which feels mostly useless but sometimes useful. Maybe
1655 * make it another option? For now suppress them.
1656 */
5b594f45
FK
1657 if (opt->count && count) {
1658 char buf[32];
f76d947a
RS
1659 if (opt->pathname) {
1660 output_color(opt, gs->name, strlen(gs->name),
1661 opt->color_filename);
1662 output_sep(opt, ':');
1663 }
55f638bd 1664 snprintf(buf, sizeof(buf), "%u\n", count);
5b594f45 1665 opt->output(opt, buf, strlen(buf));
c30c10cf 1666 return 1;
5b594f45 1667 }
83b5d2f5
JH
1668 return !!last_hit;
1669}
1670
0ab7befa
JH
1671static void clr_hit_marker(struct grep_expr *x)
1672{
1673 /* All-hit markers are meaningful only at the very top level
1674 * OR node.
1675 */
1676 while (1) {
1677 x->hit = 0;
1678 if (x->node != GREP_NODE_OR)
1679 return;
1680 x->u.binary.left->hit = 0;
1681 x = x->u.binary.right;
1682 }
1683}
1684
1685static int chk_hit_marker(struct grep_expr *x)
1686{
1687 /* Top level nodes have hit markers. See if they all are hits */
1688 while (1) {
1689 if (x->node != GREP_NODE_OR)
1690 return x->hit;
1691 if (!x->u.binary.left->hit)
1692 return 0;
1693 x = x->u.binary.right;
1694 }
1695}
1696
e1327023 1697int grep_source(struct grep_opt *opt, struct grep_source *gs)
0ab7befa
JH
1698{
1699 /*
1700 * we do not have to do the two-pass grep when we do not check
1701 * buffer-wide "all-match".
1702 */
1703 if (!opt->all_match)
e1327023 1704 return grep_source_1(opt, gs, 0);
0ab7befa
JH
1705
1706 /* Otherwise the toplevel "or" terms hit a bit differently.
1707 * We first clear hit markers from them.
1708 */
1709 clr_hit_marker(opt->pattern_expression);
e1327023 1710 grep_source_1(opt, gs, 1);
0ab7befa
JH
1711
1712 if (!chk_hit_marker(opt->pattern_expression))
1713 return 0;
1714
e1327023
JK
1715 return grep_source_1(opt, gs, 0);
1716}
1717
c876d6da 1718int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
e1327023
JK
1719{
1720 struct grep_source gs;
1721 int r;
1722
55c61688 1723 grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL, NULL);
e1327023
JK
1724 gs.buf = buf;
1725 gs.size = size;
1726
1727 r = grep_source(opt, &gs);
1728
1729 grep_source_clear(&gs);
1730 return r;
1731}
1732
1733void grep_source_init(struct grep_source *gs, enum grep_source_type type,
55c61688
NTND
1734 const char *name, const char *path,
1735 const void *identifier)
e1327023
JK
1736{
1737 gs->type = type;
8c53f071
JK
1738 gs->name = xstrdup_or_null(name);
1739 gs->path = xstrdup_or_null(path);
e1327023
JK
1740 gs->buf = NULL;
1741 gs->size = 0;
94ad9d9e 1742 gs->driver = NULL;
e1327023
JK
1743
1744 switch (type) {
1745 case GREP_SOURCE_FILE:
1746 gs->identifier = xstrdup(identifier);
1747 break;
1748 case GREP_SOURCE_SHA1:
1749 gs->identifier = xmalloc(20);
50546b15 1750 hashcpy(gs->identifier, identifier);
e1327023
JK
1751 break;
1752 case GREP_SOURCE_BUF:
1753 gs->identifier = NULL;
1754 }
1755}
1756
1757void grep_source_clear(struct grep_source *gs)
1758{
1759 free(gs->name);
1760 gs->name = NULL;
55c61688
NTND
1761 free(gs->path);
1762 gs->path = NULL;
e1327023
JK
1763 free(gs->identifier);
1764 gs->identifier = NULL;
1765 grep_source_clear_data(gs);
1766}
1767
1768void grep_source_clear_data(struct grep_source *gs)
1769{
1770 switch (gs->type) {
1771 case GREP_SOURCE_FILE:
1772 case GREP_SOURCE_SHA1:
1773 free(gs->buf);
1774 gs->buf = NULL;
1775 gs->size = 0;
1776 break;
1777 case GREP_SOURCE_BUF:
1778 /* leave user-provided buf intact */
1779 break;
1780 }
1781}
1782
1783static int grep_source_load_sha1(struct grep_source *gs)
1784{
1785 enum object_type type;
1786
1787 grep_read_lock();
1788 gs->buf = read_sha1_file(gs->identifier, &type, &gs->size);
1789 grep_read_unlock();
1790
1791 if (!gs->buf)
1792 return error(_("'%s': unable to read %s"),
1793 gs->name,
1794 sha1_to_hex(gs->identifier));
1795 return 0;
1796}
1797
1798static int grep_source_load_file(struct grep_source *gs)
1799{
1800 const char *filename = gs->identifier;
1801 struct stat st;
1802 char *data;
1803 size_t size;
1804 int i;
1805
1806 if (lstat(filename, &st) < 0) {
1807 err_ret:
1808 if (errno != ENOENT)
7645d8f1 1809 error_errno(_("failed to stat '%s'"), filename);
e1327023
JK
1810 return -1;
1811 }
1812 if (!S_ISREG(st.st_mode))
1813 return -1;
1814 size = xsize_t(st.st_size);
1815 i = open(filename, O_RDONLY);
1816 if (i < 0)
1817 goto err_ret;
3733e694 1818 data = xmallocz(size);
e1327023 1819 if (st.st_size != read_in_full(i, data, size)) {
7645d8f1 1820 error_errno(_("'%s': short read"), filename);
e1327023
JK
1821 close(i);
1822 free(data);
1823 return -1;
1824 }
1825 close(i);
e1327023
JK
1826
1827 gs->buf = data;
1828 gs->size = size;
1829 return 0;
1830}
1831
3083301e 1832static int grep_source_load(struct grep_source *gs)
e1327023
JK
1833{
1834 if (gs->buf)
1835 return 0;
1836
1837 switch (gs->type) {
1838 case GREP_SOURCE_FILE:
1839 return grep_source_load_file(gs);
1840 case GREP_SOURCE_SHA1:
1841 return grep_source_load_sha1(gs);
1842 case GREP_SOURCE_BUF:
1843 return gs->buf ? 0 : -1;
1844 }
1845 die("BUG: invalid grep_source type");
0ab7befa 1846}
94ad9d9e
JK
1847
1848void grep_source_load_driver(struct grep_source *gs)
1849{
1850 if (gs->driver)
1851 return;
1852
1853 grep_attr_lock();
55c61688
NTND
1854 if (gs->path)
1855 gs->driver = userdiff_find_by_path(gs->path);
94ad9d9e
JK
1856 if (!gs->driver)
1857 gs->driver = userdiff_find_by_name("default");
1858 grep_attr_unlock();
1859}
41b59bfc 1860
3083301e 1861static int grep_source_is_binary(struct grep_source *gs)
41b59bfc
JK
1862{
1863 grep_source_load_driver(gs);
1864 if (gs->driver->binary != -1)
1865 return gs->driver->binary;
1866
1867 if (!grep_source_load(gs))
1868 return buffer_is_binary(gs->buf, gs->size);
1869
1870 return 0;
1871}