grep: grep: refactor handling of binary mode options
[git/git.git] / grep.c
1 #include "cache.h"
2 #include "grep.h"
3 #include "userdiff.h"
4 #include "xdiff-interface.h"
5
6 void append_header_grep_pattern(struct grep_opt *opt, enum grep_header_field field, const char *pat)
7 {
8 struct grep_pat *p = xcalloc(1, sizeof(*p));
9 p->pattern = pat;
10 p->origin = "header";
11 p->no = 0;
12 p->token = GREP_PATTERN_HEAD;
13 p->field = field;
14 *opt->header_tail = p;
15 opt->header_tail = &p->next;
16 p->next = NULL;
17 }
18
19 void append_grep_pattern(struct grep_opt *opt, const char *pat,
20 const char *origin, int no, enum grep_pat_token t)
21 {
22 struct grep_pat *p = xcalloc(1, sizeof(*p));
23 p->pattern = pat;
24 p->origin = origin;
25 p->no = no;
26 p->token = t;
27 *opt->pattern_tail = p;
28 opt->pattern_tail = &p->next;
29 p->next = NULL;
30 }
31
32 struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
33 {
34 struct grep_pat *pat;
35 struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
36 *ret = *opt;
37
38 ret->pattern_list = NULL;
39 ret->pattern_tail = &ret->pattern_list;
40
41 for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
42 {
43 if(pat->token == GREP_PATTERN_HEAD)
44 append_header_grep_pattern(ret, pat->field,
45 pat->pattern);
46 else
47 append_grep_pattern(ret, pat->pattern, pat->origin,
48 pat->no, pat->token);
49 }
50
51 return ret;
52 }
53
54 static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
55 {
56 int err;
57
58 p->word_regexp = opt->word_regexp;
59 p->ignore_case = opt->ignore_case;
60 p->fixed = opt->fixed;
61
62 if (p->fixed)
63 return;
64
65 err = regcomp(&p->regexp, p->pattern, opt->regflags);
66 if (err) {
67 char errbuf[1024];
68 char where[1024];
69 if (p->no)
70 sprintf(where, "In '%s' at %d, ",
71 p->origin, p->no);
72 else if (p->origin)
73 sprintf(where, "%s, ", p->origin);
74 else
75 where[0] = 0;
76 regerror(err, &p->regexp, errbuf, 1024);
77 regfree(&p->regexp);
78 die("%s'%s': %s", where, p->pattern, errbuf);
79 }
80 }
81
82 static struct grep_expr *compile_pattern_or(struct grep_pat **);
83 static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
84 {
85 struct grep_pat *p;
86 struct grep_expr *x;
87
88 p = *list;
89 if (!p)
90 return NULL;
91 switch (p->token) {
92 case GREP_PATTERN: /* atom */
93 case GREP_PATTERN_HEAD:
94 case GREP_PATTERN_BODY:
95 x = xcalloc(1, sizeof (struct grep_expr));
96 x->node = GREP_NODE_ATOM;
97 x->u.atom = p;
98 *list = p->next;
99 return x;
100 case GREP_OPEN_PAREN:
101 *list = p->next;
102 x = compile_pattern_or(list);
103 if (!*list || (*list)->token != GREP_CLOSE_PAREN)
104 die("unmatched parenthesis");
105 *list = (*list)->next;
106 return x;
107 default:
108 return NULL;
109 }
110 }
111
112 static struct grep_expr *compile_pattern_not(struct grep_pat **list)
113 {
114 struct grep_pat *p;
115 struct grep_expr *x;
116
117 p = *list;
118 if (!p)
119 return NULL;
120 switch (p->token) {
121 case GREP_NOT:
122 if (!p->next)
123 die("--not not followed by pattern expression");
124 *list = p->next;
125 x = xcalloc(1, sizeof (struct grep_expr));
126 x->node = GREP_NODE_NOT;
127 x->u.unary = compile_pattern_not(list);
128 if (!x->u.unary)
129 die("--not followed by non pattern expression");
130 return x;
131 default:
132 return compile_pattern_atom(list);
133 }
134 }
135
136 static struct grep_expr *compile_pattern_and(struct grep_pat **list)
137 {
138 struct grep_pat *p;
139 struct grep_expr *x, *y, *z;
140
141 x = compile_pattern_not(list);
142 p = *list;
143 if (p && p->token == GREP_AND) {
144 if (!p->next)
145 die("--and not followed by pattern expression");
146 *list = p->next;
147 y = compile_pattern_and(list);
148 if (!y)
149 die("--and not followed by pattern expression");
150 z = xcalloc(1, sizeof (struct grep_expr));
151 z->node = GREP_NODE_AND;
152 z->u.binary.left = x;
153 z->u.binary.right = y;
154 return z;
155 }
156 return x;
157 }
158
159 static struct grep_expr *compile_pattern_or(struct grep_pat **list)
160 {
161 struct grep_pat *p;
162 struct grep_expr *x, *y, *z;
163
164 x = compile_pattern_and(list);
165 p = *list;
166 if (x && p && p->token != GREP_CLOSE_PAREN) {
167 y = compile_pattern_or(list);
168 if (!y)
169 die("not a pattern expression %s", p->pattern);
170 z = xcalloc(1, sizeof (struct grep_expr));
171 z->node = GREP_NODE_OR;
172 z->u.binary.left = x;
173 z->u.binary.right = y;
174 return z;
175 }
176 return x;
177 }
178
179 static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
180 {
181 return compile_pattern_or(list);
182 }
183
184 void compile_grep_patterns(struct grep_opt *opt)
185 {
186 struct grep_pat *p;
187 struct grep_expr *header_expr = NULL;
188
189 if (opt->header_list) {
190 p = opt->header_list;
191 header_expr = compile_pattern_expr(&p);
192 if (p)
193 die("incomplete pattern expression: %s", p->pattern);
194 for (p = opt->header_list; p; p = p->next) {
195 switch (p->token) {
196 case GREP_PATTERN: /* atom */
197 case GREP_PATTERN_HEAD:
198 case GREP_PATTERN_BODY:
199 compile_regexp(p, opt);
200 break;
201 default:
202 opt->extended = 1;
203 break;
204 }
205 }
206 }
207
208 for (p = opt->pattern_list; p; p = p->next) {
209 switch (p->token) {
210 case GREP_PATTERN: /* atom */
211 case GREP_PATTERN_HEAD:
212 case GREP_PATTERN_BODY:
213 compile_regexp(p, opt);
214 break;
215 default:
216 opt->extended = 1;
217 break;
218 }
219 }
220
221 if (opt->all_match || header_expr)
222 opt->extended = 1;
223 else if (!opt->extended)
224 return;
225
226 /* Then bundle them up in an expression.
227 * A classic recursive descent parser would do.
228 */
229 p = opt->pattern_list;
230 if (p)
231 opt->pattern_expression = compile_pattern_expr(&p);
232 if (p)
233 die("incomplete pattern expression: %s", p->pattern);
234
235 if (!header_expr)
236 return;
237
238 if (opt->pattern_expression) {
239 struct grep_expr *z;
240 z = xcalloc(1, sizeof(*z));
241 z->node = GREP_NODE_OR;
242 z->u.binary.left = opt->pattern_expression;
243 z->u.binary.right = header_expr;
244 opt->pattern_expression = z;
245 } else {
246 opt->pattern_expression = header_expr;
247 }
248 opt->all_match = 1;
249 }
250
251 static void free_pattern_expr(struct grep_expr *x)
252 {
253 switch (x->node) {
254 case GREP_NODE_ATOM:
255 break;
256 case GREP_NODE_NOT:
257 free_pattern_expr(x->u.unary);
258 break;
259 case GREP_NODE_AND:
260 case GREP_NODE_OR:
261 free_pattern_expr(x->u.binary.left);
262 free_pattern_expr(x->u.binary.right);
263 break;
264 }
265 free(x);
266 }
267
268 void free_grep_patterns(struct grep_opt *opt)
269 {
270 struct grep_pat *p, *n;
271
272 for (p = opt->pattern_list; p; p = n) {
273 n = p->next;
274 switch (p->token) {
275 case GREP_PATTERN: /* atom */
276 case GREP_PATTERN_HEAD:
277 case GREP_PATTERN_BODY:
278 regfree(&p->regexp);
279 break;
280 default:
281 break;
282 }
283 free(p);
284 }
285
286 if (!opt->extended)
287 return;
288 free_pattern_expr(opt->pattern_expression);
289 }
290
291 static char *end_of_line(char *cp, unsigned long *left)
292 {
293 unsigned long l = *left;
294 while (l && *cp != '\n') {
295 l--;
296 cp++;
297 }
298 *left = l;
299 return cp;
300 }
301
302 static int word_char(char ch)
303 {
304 return isalnum(ch) || ch == '_';
305 }
306
307 static void output_color(struct grep_opt *opt, const void *data, size_t size,
308 const char *color)
309 {
310 if (opt->color && color && color[0]) {
311 opt->output(opt, color, strlen(color));
312 opt->output(opt, data, size);
313 opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
314 } else
315 opt->output(opt, data, size);
316 }
317
318 static void output_sep(struct grep_opt *opt, char sign)
319 {
320 if (opt->null_following_name)
321 opt->output(opt, "\0", 1);
322 else
323 output_color(opt, &sign, 1, opt->color_sep);
324 }
325
326 static void show_name(struct grep_opt *opt, const char *name)
327 {
328 output_color(opt, name, strlen(name), opt->color_filename);
329 opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
330 }
331
332
333 static int fixmatch(const char *pattern, char *line, int ignore_case, regmatch_t *match)
334 {
335 char *hit;
336 if (ignore_case)
337 hit = strcasestr(line, pattern);
338 else
339 hit = strstr(line, pattern);
340
341 if (!hit) {
342 match->rm_so = match->rm_eo = -1;
343 return REG_NOMATCH;
344 }
345 else {
346 match->rm_so = hit - line;
347 match->rm_eo = match->rm_so + strlen(pattern);
348 return 0;
349 }
350 }
351
352 static int strip_timestamp(char *bol, char **eol_p)
353 {
354 char *eol = *eol_p;
355 int ch;
356
357 while (bol < --eol) {
358 if (*eol != '>')
359 continue;
360 *eol_p = ++eol;
361 ch = *eol;
362 *eol = '\0';
363 return ch;
364 }
365 return 0;
366 }
367
368 static struct {
369 const char *field;
370 size_t len;
371 } header_field[] = {
372 { "author ", 7 },
373 { "committer ", 10 },
374 };
375
376 static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
377 enum grep_context ctx,
378 regmatch_t *pmatch, int eflags)
379 {
380 int hit = 0;
381 int saved_ch = 0;
382 const char *start = bol;
383
384 if ((p->token != GREP_PATTERN) &&
385 ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
386 return 0;
387
388 if (p->token == GREP_PATTERN_HEAD) {
389 const char *field;
390 size_t len;
391 assert(p->field < ARRAY_SIZE(header_field));
392 field = header_field[p->field].field;
393 len = header_field[p->field].len;
394 if (strncmp(bol, field, len))
395 return 0;
396 bol += len;
397 saved_ch = strip_timestamp(bol, &eol);
398 }
399
400 again:
401 if (p->fixed)
402 hit = !fixmatch(p->pattern, bol, p->ignore_case, pmatch);
403 else
404 hit = !regexec(&p->regexp, bol, 1, pmatch, eflags);
405
406 if (hit && p->word_regexp) {
407 if ((pmatch[0].rm_so < 0) ||
408 (eol - bol) < pmatch[0].rm_so ||
409 (pmatch[0].rm_eo < 0) ||
410 (eol - bol) < pmatch[0].rm_eo)
411 die("regexp returned nonsense");
412
413 /* Match beginning must be either beginning of the
414 * line, or at word boundary (i.e. the last char must
415 * not be a word char). Similarly, match end must be
416 * either end of the line, or at word boundary
417 * (i.e. the next char must not be a word char).
418 */
419 if ( ((pmatch[0].rm_so == 0) ||
420 !word_char(bol[pmatch[0].rm_so-1])) &&
421 ((pmatch[0].rm_eo == (eol-bol)) ||
422 !word_char(bol[pmatch[0].rm_eo])) )
423 ;
424 else
425 hit = 0;
426
427 /* Words consist of at least one character. */
428 if (pmatch->rm_so == pmatch->rm_eo)
429 hit = 0;
430
431 if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
432 /* There could be more than one match on the
433 * line, and the first match might not be
434 * strict word match. But later ones could be!
435 * Forward to the next possible start, i.e. the
436 * next position following a non-word char.
437 */
438 bol = pmatch[0].rm_so + bol + 1;
439 while (word_char(bol[-1]) && bol < eol)
440 bol++;
441 eflags |= REG_NOTBOL;
442 if (bol < eol)
443 goto again;
444 }
445 }
446 if (p->token == GREP_PATTERN_HEAD && saved_ch)
447 *eol = saved_ch;
448 if (hit) {
449 pmatch[0].rm_so += bol - start;
450 pmatch[0].rm_eo += bol - start;
451 }
452 return hit;
453 }
454
455 static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
456 enum grep_context ctx, int collect_hits)
457 {
458 int h = 0;
459 regmatch_t match;
460
461 if (!x)
462 die("Not a valid grep expression");
463 switch (x->node) {
464 case GREP_NODE_ATOM:
465 h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
466 break;
467 case GREP_NODE_NOT:
468 h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
469 break;
470 case GREP_NODE_AND:
471 if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
472 return 0;
473 h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
474 break;
475 case GREP_NODE_OR:
476 if (!collect_hits)
477 return (match_expr_eval(x->u.binary.left,
478 bol, eol, ctx, 0) ||
479 match_expr_eval(x->u.binary.right,
480 bol, eol, ctx, 0));
481 h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
482 x->u.binary.left->hit |= h;
483 h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
484 break;
485 default:
486 die("Unexpected node type (internal error) %d", x->node);
487 }
488 if (collect_hits)
489 x->hit |= h;
490 return h;
491 }
492
493 static int match_expr(struct grep_opt *opt, char *bol, char *eol,
494 enum grep_context ctx, int collect_hits)
495 {
496 struct grep_expr *x = opt->pattern_expression;
497 return match_expr_eval(x, bol, eol, ctx, collect_hits);
498 }
499
500 static int match_line(struct grep_opt *opt, char *bol, char *eol,
501 enum grep_context ctx, int collect_hits)
502 {
503 struct grep_pat *p;
504 regmatch_t match;
505
506 if (opt->extended)
507 return match_expr(opt, bol, eol, ctx, collect_hits);
508
509 /* we do not call with collect_hits without being extended */
510 for (p = opt->pattern_list; p; p = p->next) {
511 if (match_one_pattern(p, bol, eol, ctx, &match, 0))
512 return 1;
513 }
514 return 0;
515 }
516
517 static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
518 enum grep_context ctx,
519 regmatch_t *pmatch, int eflags)
520 {
521 regmatch_t match;
522
523 if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
524 return 0;
525 if (match.rm_so < 0 || match.rm_eo < 0)
526 return 0;
527 if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
528 if (match.rm_so > pmatch->rm_so)
529 return 1;
530 if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
531 return 1;
532 }
533 pmatch->rm_so = match.rm_so;
534 pmatch->rm_eo = match.rm_eo;
535 return 1;
536 }
537
538 static int next_match(struct grep_opt *opt, char *bol, char *eol,
539 enum grep_context ctx, regmatch_t *pmatch, int eflags)
540 {
541 struct grep_pat *p;
542 int hit = 0;
543
544 pmatch->rm_so = pmatch->rm_eo = -1;
545 if (bol < eol) {
546 for (p = opt->pattern_list; p; p = p->next) {
547 switch (p->token) {
548 case GREP_PATTERN: /* atom */
549 case GREP_PATTERN_HEAD:
550 case GREP_PATTERN_BODY:
551 hit |= match_next_pattern(p, bol, eol, ctx,
552 pmatch, eflags);
553 break;
554 default:
555 break;
556 }
557 }
558 }
559 return hit;
560 }
561
562 static void show_line(struct grep_opt *opt, char *bol, char *eol,
563 const char *name, unsigned lno, char sign)
564 {
565 int rest = eol - bol;
566 char *line_color = NULL;
567
568 if (opt->pre_context || opt->post_context) {
569 if (opt->last_shown == 0) {
570 if (opt->show_hunk_mark) {
571 output_color(opt, "--", 2, opt->color_sep);
572 opt->output(opt, "\n", 1);
573 }
574 } else if (lno > opt->last_shown + 1) {
575 output_color(opt, "--", 2, opt->color_sep);
576 opt->output(opt, "\n", 1);
577 }
578 }
579 opt->last_shown = lno;
580
581 if (opt->pathname) {
582 output_color(opt, name, strlen(name), opt->color_filename);
583 output_sep(opt, sign);
584 }
585 if (opt->linenum) {
586 char buf[32];
587 snprintf(buf, sizeof(buf), "%d", lno);
588 output_color(opt, buf, strlen(buf), opt->color_lineno);
589 output_sep(opt, sign);
590 }
591 if (opt->color) {
592 regmatch_t match;
593 enum grep_context ctx = GREP_CONTEXT_BODY;
594 int ch = *eol;
595 int eflags = 0;
596
597 if (sign == ':')
598 line_color = opt->color_selected;
599 else if (sign == '-')
600 line_color = opt->color_context;
601 else if (sign == '=')
602 line_color = opt->color_function;
603 *eol = '\0';
604 while (next_match(opt, bol, eol, ctx, &match, eflags)) {
605 if (match.rm_so == match.rm_eo)
606 break;
607
608 output_color(opt, bol, match.rm_so, line_color);
609 output_color(opt, bol + match.rm_so,
610 match.rm_eo - match.rm_so,
611 opt->color_match);
612 bol += match.rm_eo;
613 rest -= match.rm_eo;
614 eflags = REG_NOTBOL;
615 }
616 *eol = ch;
617 }
618 output_color(opt, bol, rest, line_color);
619 opt->output(opt, "\n", 1);
620 }
621
622 static int match_funcname(struct grep_opt *opt, char *bol, char *eol)
623 {
624 xdemitconf_t *xecfg = opt->priv;
625 if (xecfg && xecfg->find_func) {
626 char buf[1];
627 return xecfg->find_func(bol, eol - bol, buf, 1,
628 xecfg->find_func_priv) >= 0;
629 }
630
631 if (bol == eol)
632 return 0;
633 if (isalpha(*bol) || *bol == '_' || *bol == '$')
634 return 1;
635 return 0;
636 }
637
638 static void show_funcname_line(struct grep_opt *opt, const char *name,
639 char *buf, char *bol, unsigned lno)
640 {
641 while (bol > buf) {
642 char *eol = --bol;
643
644 while (bol > buf && bol[-1] != '\n')
645 bol--;
646 lno--;
647
648 if (lno <= opt->last_shown)
649 break;
650
651 if (match_funcname(opt, bol, eol)) {
652 show_line(opt, bol, eol, name, lno, '=');
653 break;
654 }
655 }
656 }
657
658 static void show_pre_context(struct grep_opt *opt, const char *name, char *buf,
659 char *bol, unsigned lno)
660 {
661 unsigned cur = lno, from = 1, funcname_lno = 0;
662 int funcname_needed = opt->funcname;
663
664 if (opt->pre_context < lno)
665 from = lno - opt->pre_context;
666 if (from <= opt->last_shown)
667 from = opt->last_shown + 1;
668
669 /* Rewind. */
670 while (bol > buf && cur > from) {
671 char *eol = --bol;
672
673 while (bol > buf && bol[-1] != '\n')
674 bol--;
675 cur--;
676 if (funcname_needed && match_funcname(opt, bol, eol)) {
677 funcname_lno = cur;
678 funcname_needed = 0;
679 }
680 }
681
682 /* We need to look even further back to find a function signature. */
683 if (opt->funcname && funcname_needed)
684 show_funcname_line(opt, name, buf, bol, cur);
685
686 /* Back forward. */
687 while (cur < lno) {
688 char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
689
690 while (*eol != '\n')
691 eol++;
692 show_line(opt, bol, eol, name, cur, sign);
693 bol = eol + 1;
694 cur++;
695 }
696 }
697
698 static int should_lookahead(struct grep_opt *opt)
699 {
700 struct grep_pat *p;
701
702 if (opt->extended)
703 return 0; /* punt for too complex stuff */
704 if (opt->invert)
705 return 0;
706 for (p = opt->pattern_list; p; p = p->next) {
707 if (p->token != GREP_PATTERN)
708 return 0; /* punt for "header only" and stuff */
709 }
710 return 1;
711 }
712
713 static int look_ahead(struct grep_opt *opt,
714 unsigned long *left_p,
715 unsigned *lno_p,
716 char **bol_p)
717 {
718 unsigned lno = *lno_p;
719 char *bol = *bol_p;
720 struct grep_pat *p;
721 char *sp, *last_bol;
722 regoff_t earliest = -1;
723
724 for (p = opt->pattern_list; p; p = p->next) {
725 int hit;
726 regmatch_t m;
727
728 if (p->fixed)
729 hit = !fixmatch(p->pattern, bol, p->ignore_case, &m);
730 else {
731 #ifdef REG_STARTEND
732 m.rm_so = 0;
733 m.rm_eo = *left_p;
734 hit = !regexec(&p->regexp, bol, 1, &m, REG_STARTEND);
735 #else
736 hit = !regexec(&p->regexp, bol, 1, &m, 0);
737 #endif
738 }
739 if (!hit || m.rm_so < 0 || m.rm_eo < 0)
740 continue;
741 if (earliest < 0 || m.rm_so < earliest)
742 earliest = m.rm_so;
743 }
744
745 if (earliest < 0) {
746 *bol_p = bol + *left_p;
747 *left_p = 0;
748 return 1;
749 }
750 for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
751 ; /* find the beginning of the line */
752 last_bol = sp;
753
754 for (sp = bol; sp < last_bol; sp++) {
755 if (*sp == '\n')
756 lno++;
757 }
758 *left_p -= last_bol - bol;
759 *bol_p = last_bol;
760 *lno_p = lno;
761 return 0;
762 }
763
764 int grep_threads_ok(const struct grep_opt *opt)
765 {
766 /* If this condition is true, then we may use the attribute
767 * machinery in grep_buffer_1. The attribute code is not
768 * thread safe, so we disable the use of threads.
769 */
770 if (opt->funcname && !opt->unmatch_name_only && !opt->status_only &&
771 !opt->name_only)
772 return 0;
773
774 return 1;
775 }
776
777 static void std_output(struct grep_opt *opt, const void *buf, size_t size)
778 {
779 fwrite(buf, size, 1, stdout);
780 }
781
782 static int grep_buffer_1(struct grep_opt *opt, const char *name,
783 char *buf, unsigned long size, int collect_hits)
784 {
785 char *bol = buf;
786 unsigned long left = size;
787 unsigned lno = 1;
788 unsigned last_hit = 0;
789 int binary_match_only = 0;
790 unsigned count = 0;
791 int try_lookahead = 0;
792 enum grep_context ctx = GREP_CONTEXT_HEAD;
793 xdemitconf_t xecfg;
794
795 if (!opt->output)
796 opt->output = std_output;
797
798 if (opt->last_shown && (opt->pre_context || opt->post_context) &&
799 opt->output == std_output)
800 opt->show_hunk_mark = 1;
801 opt->last_shown = 0;
802
803 switch (opt->binary) {
804 case GREP_BINARY_DEFAULT:
805 if (buffer_is_binary(buf, size))
806 binary_match_only = 1;
807 break;
808 case GREP_BINARY_NOMATCH:
809 if (buffer_is_binary(buf, size))
810 return 0; /* Assume unmatch */
811 break;
812 case GREP_BINARY_TEXT:
813 break;
814 default:
815 die("bug: unknown binary handling mode");
816 }
817
818 memset(&xecfg, 0, sizeof(xecfg));
819 if (opt->funcname && !opt->unmatch_name_only && !opt->status_only &&
820 !opt->name_only && !binary_match_only && !collect_hits) {
821 struct userdiff_driver *drv = userdiff_find_by_path(name);
822 if (drv && drv->funcname.pattern) {
823 const struct userdiff_funcname *pe = &drv->funcname;
824 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
825 opt->priv = &xecfg;
826 }
827 }
828 try_lookahead = should_lookahead(opt);
829
830 while (left) {
831 char *eol, ch;
832 int hit;
833
834 /*
835 * look_ahead() skips quicly to the line that possibly
836 * has the next hit; don't call it if we need to do
837 * something more than just skipping the current line
838 * in response to an unmatch for the current line. E.g.
839 * inside a post-context window, we will show the current
840 * line as a context around the previous hit when it
841 * doesn't hit.
842 */
843 if (try_lookahead
844 && !(last_hit
845 && lno <= last_hit + opt->post_context)
846 && look_ahead(opt, &left, &lno, &bol))
847 break;
848 eol = end_of_line(bol, &left);
849 ch = *eol;
850 *eol = 0;
851
852 if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
853 ctx = GREP_CONTEXT_BODY;
854
855 hit = match_line(opt, bol, eol, ctx, collect_hits);
856 *eol = ch;
857
858 if (collect_hits)
859 goto next_line;
860
861 /* "grep -v -e foo -e bla" should list lines
862 * that do not have either, so inversion should
863 * be done outside.
864 */
865 if (opt->invert)
866 hit = !hit;
867 if (opt->unmatch_name_only) {
868 if (hit)
869 return 0;
870 goto next_line;
871 }
872 if (hit) {
873 count++;
874 if (opt->status_only)
875 return 1;
876 if (binary_match_only) {
877 opt->output(opt, "Binary file ", 12);
878 output_color(opt, name, strlen(name),
879 opt->color_filename);
880 opt->output(opt, " matches\n", 9);
881 return 1;
882 }
883 if (opt->name_only) {
884 show_name(opt, name);
885 return 1;
886 }
887 /* Hit at this line. If we haven't shown the
888 * pre-context lines, we would need to show them.
889 * When asked to do "count", this still show
890 * the context which is nonsense, but the user
891 * deserves to get that ;-).
892 */
893 if (opt->pre_context)
894 show_pre_context(opt, name, buf, bol, lno);
895 else if (opt->funcname)
896 show_funcname_line(opt, name, buf, bol, lno);
897 if (!opt->count)
898 show_line(opt, bol, eol, name, lno, ':');
899 last_hit = lno;
900 }
901 else if (last_hit &&
902 lno <= last_hit + opt->post_context) {
903 /* If the last hit is within the post context,
904 * we need to show this line.
905 */
906 show_line(opt, bol, eol, name, lno, '-');
907 }
908
909 next_line:
910 bol = eol + 1;
911 if (!left)
912 break;
913 left--;
914 lno++;
915 }
916
917 if (collect_hits)
918 return 0;
919
920 if (opt->status_only)
921 return 0;
922 if (opt->unmatch_name_only) {
923 /* We did not see any hit, so we want to show this */
924 show_name(opt, name);
925 return 1;
926 }
927
928 xdiff_clear_find_func(&xecfg);
929 opt->priv = NULL;
930
931 /* NEEDSWORK:
932 * The real "grep -c foo *.c" gives many "bar.c:0" lines,
933 * which feels mostly useless but sometimes useful. Maybe
934 * make it another option? For now suppress them.
935 */
936 if (opt->count && count) {
937 char buf[32];
938 output_color(opt, name, strlen(name), opt->color_filename);
939 output_sep(opt, ':');
940 snprintf(buf, sizeof(buf), "%u\n", count);
941 opt->output(opt, buf, strlen(buf));
942 }
943 return !!last_hit;
944 }
945
946 static void clr_hit_marker(struct grep_expr *x)
947 {
948 /* All-hit markers are meaningful only at the very top level
949 * OR node.
950 */
951 while (1) {
952 x->hit = 0;
953 if (x->node != GREP_NODE_OR)
954 return;
955 x->u.binary.left->hit = 0;
956 x = x->u.binary.right;
957 }
958 }
959
960 static int chk_hit_marker(struct grep_expr *x)
961 {
962 /* Top level nodes have hit markers. See if they all are hits */
963 while (1) {
964 if (x->node != GREP_NODE_OR)
965 return x->hit;
966 if (!x->u.binary.left->hit)
967 return 0;
968 x = x->u.binary.right;
969 }
970 }
971
972 int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long size)
973 {
974 /*
975 * we do not have to do the two-pass grep when we do not check
976 * buffer-wide "all-match".
977 */
978 if (!opt->all_match)
979 return grep_buffer_1(opt, name, buf, size, 0);
980
981 /* Otherwise the toplevel "or" terms hit a bit differently.
982 * We first clear hit markers from them.
983 */
984 clr_hit_marker(opt->pattern_expression);
985 grep_buffer_1(opt, name, buf, size, 1);
986
987 if (!chk_hit_marker(opt->pattern_expression))
988 return 0;
989
990 return grep_buffer_1(opt, name, buf, size, 0);
991 }