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Commit | Line | Data |
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83b5d2f5 | 1 | #include "cache.h" |
83b5d2f5 | 2 | #include "grep.h" |
6bfce93e | 3 | #include "xdiff-interface.h" |
83b5d2f5 | 4 | |
a4d7d2c6 JH |
5 | void append_header_grep_pattern(struct grep_opt *opt, enum grep_header_field field, const char *pat) |
6 | { | |
7 | struct grep_pat *p = xcalloc(1, sizeof(*p)); | |
8 | p->pattern = pat; | |
9 | p->origin = "header"; | |
10 | p->no = 0; | |
11 | p->token = GREP_PATTERN_HEAD; | |
12 | p->field = field; | |
13 | *opt->pattern_tail = p; | |
14 | opt->pattern_tail = &p->next; | |
15 | p->next = NULL; | |
16 | } | |
17 | ||
83b5d2f5 JH |
18 | void append_grep_pattern(struct grep_opt *opt, const char *pat, |
19 | const char *origin, int no, enum grep_pat_token t) | |
20 | { | |
21 | struct grep_pat *p = xcalloc(1, sizeof(*p)); | |
22 | p->pattern = pat; | |
23 | p->origin = origin; | |
24 | p->no = no; | |
25 | p->token = t; | |
26 | *opt->pattern_tail = p; | |
27 | opt->pattern_tail = &p->next; | |
28 | p->next = NULL; | |
29 | } | |
30 | ||
c822255c RS |
31 | static int is_fixed(const char *s) |
32 | { | |
f9b7cce6 | 33 | while (*s && !is_regex_special(*s)) |
c822255c RS |
34 | s++; |
35 | return !*s; | |
36 | } | |
37 | ||
83b5d2f5 JH |
38 | static void compile_regexp(struct grep_pat *p, struct grep_opt *opt) |
39 | { | |
c822255c RS |
40 | int err; |
41 | ||
d7eb527d RS |
42 | p->word_regexp = opt->word_regexp; |
43 | ||
c822255c RS |
44 | if (opt->fixed || is_fixed(p->pattern)) |
45 | p->fixed = 1; | |
46 | if (opt->regflags & REG_ICASE) | |
47 | p->fixed = 0; | |
48 | if (p->fixed) | |
49 | return; | |
50 | ||
51 | err = regcomp(&p->regexp, p->pattern, opt->regflags); | |
83b5d2f5 JH |
52 | if (err) { |
53 | char errbuf[1024]; | |
54 | char where[1024]; | |
55 | if (p->no) | |
56 | sprintf(where, "In '%s' at %d, ", | |
57 | p->origin, p->no); | |
58 | else if (p->origin) | |
59 | sprintf(where, "%s, ", p->origin); | |
60 | else | |
61 | where[0] = 0; | |
62 | regerror(err, &p->regexp, errbuf, 1024); | |
63 | regfree(&p->regexp); | |
64 | die("%s'%s': %s", where, p->pattern, errbuf); | |
65 | } | |
66 | } | |
67 | ||
0ab7befa | 68 | static struct grep_expr *compile_pattern_or(struct grep_pat **); |
83b5d2f5 JH |
69 | static struct grep_expr *compile_pattern_atom(struct grep_pat **list) |
70 | { | |
71 | struct grep_pat *p; | |
72 | struct grep_expr *x; | |
73 | ||
74 | p = *list; | |
75 | switch (p->token) { | |
76 | case GREP_PATTERN: /* atom */ | |
480c1ca6 JH |
77 | case GREP_PATTERN_HEAD: |
78 | case GREP_PATTERN_BODY: | |
83b5d2f5 JH |
79 | x = xcalloc(1, sizeof (struct grep_expr)); |
80 | x->node = GREP_NODE_ATOM; | |
81 | x->u.atom = p; | |
82 | *list = p->next; | |
83 | return x; | |
84 | case GREP_OPEN_PAREN: | |
85 | *list = p->next; | |
0ab7befa | 86 | x = compile_pattern_or(list); |
83b5d2f5 JH |
87 | if (!x) |
88 | return NULL; | |
89 | if (!*list || (*list)->token != GREP_CLOSE_PAREN) | |
90 | die("unmatched parenthesis"); | |
91 | *list = (*list)->next; | |
92 | return x; | |
93 | default: | |
94 | return NULL; | |
95 | } | |
96 | } | |
97 | ||
98 | static struct grep_expr *compile_pattern_not(struct grep_pat **list) | |
99 | { | |
100 | struct grep_pat *p; | |
101 | struct grep_expr *x; | |
102 | ||
103 | p = *list; | |
104 | switch (p->token) { | |
105 | case GREP_NOT: | |
106 | if (!p->next) | |
107 | die("--not not followed by pattern expression"); | |
108 | *list = p->next; | |
109 | x = xcalloc(1, sizeof (struct grep_expr)); | |
110 | x->node = GREP_NODE_NOT; | |
111 | x->u.unary = compile_pattern_not(list); | |
112 | if (!x->u.unary) | |
113 | die("--not followed by non pattern expression"); | |
114 | return x; | |
115 | default: | |
116 | return compile_pattern_atom(list); | |
117 | } | |
118 | } | |
119 | ||
120 | static struct grep_expr *compile_pattern_and(struct grep_pat **list) | |
121 | { | |
122 | struct grep_pat *p; | |
123 | struct grep_expr *x, *y, *z; | |
124 | ||
125 | x = compile_pattern_not(list); | |
126 | p = *list; | |
127 | if (p && p->token == GREP_AND) { | |
128 | if (!p->next) | |
129 | die("--and not followed by pattern expression"); | |
130 | *list = p->next; | |
131 | y = compile_pattern_and(list); | |
132 | if (!y) | |
133 | die("--and not followed by pattern expression"); | |
134 | z = xcalloc(1, sizeof (struct grep_expr)); | |
135 | z->node = GREP_NODE_AND; | |
136 | z->u.binary.left = x; | |
137 | z->u.binary.right = y; | |
138 | return z; | |
139 | } | |
140 | return x; | |
141 | } | |
142 | ||
143 | static struct grep_expr *compile_pattern_or(struct grep_pat **list) | |
144 | { | |
145 | struct grep_pat *p; | |
146 | struct grep_expr *x, *y, *z; | |
147 | ||
148 | x = compile_pattern_and(list); | |
149 | p = *list; | |
150 | if (x && p && p->token != GREP_CLOSE_PAREN) { | |
151 | y = compile_pattern_or(list); | |
152 | if (!y) | |
153 | die("not a pattern expression %s", p->pattern); | |
154 | z = xcalloc(1, sizeof (struct grep_expr)); | |
155 | z->node = GREP_NODE_OR; | |
156 | z->u.binary.left = x; | |
157 | z->u.binary.right = y; | |
158 | return z; | |
159 | } | |
160 | return x; | |
161 | } | |
162 | ||
163 | static struct grep_expr *compile_pattern_expr(struct grep_pat **list) | |
164 | { | |
165 | return compile_pattern_or(list); | |
166 | } | |
167 | ||
168 | void compile_grep_patterns(struct grep_opt *opt) | |
169 | { | |
170 | struct grep_pat *p; | |
171 | ||
0ab7befa JH |
172 | if (opt->all_match) |
173 | opt->extended = 1; | |
174 | ||
83b5d2f5 | 175 | for (p = opt->pattern_list; p; p = p->next) { |
480c1ca6 JH |
176 | switch (p->token) { |
177 | case GREP_PATTERN: /* atom */ | |
178 | case GREP_PATTERN_HEAD: | |
179 | case GREP_PATTERN_BODY: | |
c822255c | 180 | compile_regexp(p, opt); |
480c1ca6 JH |
181 | break; |
182 | default: | |
83b5d2f5 | 183 | opt->extended = 1; |
480c1ca6 JH |
184 | break; |
185 | } | |
83b5d2f5 JH |
186 | } |
187 | ||
188 | if (!opt->extended) | |
189 | return; | |
190 | ||
191 | /* Then bundle them up in an expression. | |
192 | * A classic recursive descent parser would do. | |
193 | */ | |
194 | p = opt->pattern_list; | |
ba150a3f MB |
195 | if (p) |
196 | opt->pattern_expression = compile_pattern_expr(&p); | |
83b5d2f5 JH |
197 | if (p) |
198 | die("incomplete pattern expression: %s", p->pattern); | |
199 | } | |
200 | ||
b48fb5b6 JH |
201 | static void free_pattern_expr(struct grep_expr *x) |
202 | { | |
203 | switch (x->node) { | |
204 | case GREP_NODE_ATOM: | |
205 | break; | |
206 | case GREP_NODE_NOT: | |
207 | free_pattern_expr(x->u.unary); | |
208 | break; | |
209 | case GREP_NODE_AND: | |
210 | case GREP_NODE_OR: | |
211 | free_pattern_expr(x->u.binary.left); | |
212 | free_pattern_expr(x->u.binary.right); | |
213 | break; | |
214 | } | |
215 | free(x); | |
216 | } | |
217 | ||
218 | void free_grep_patterns(struct grep_opt *opt) | |
219 | { | |
220 | struct grep_pat *p, *n; | |
221 | ||
222 | for (p = opt->pattern_list; p; p = n) { | |
223 | n = p->next; | |
224 | switch (p->token) { | |
225 | case GREP_PATTERN: /* atom */ | |
226 | case GREP_PATTERN_HEAD: | |
227 | case GREP_PATTERN_BODY: | |
228 | regfree(&p->regexp); | |
229 | break; | |
230 | default: | |
231 | break; | |
232 | } | |
233 | free(p); | |
234 | } | |
235 | ||
236 | if (!opt->extended) | |
237 | return; | |
238 | free_pattern_expr(opt->pattern_expression); | |
239 | } | |
240 | ||
83b5d2f5 JH |
241 | static char *end_of_line(char *cp, unsigned long *left) |
242 | { | |
243 | unsigned long l = *left; | |
244 | while (l && *cp != '\n') { | |
245 | l--; | |
246 | cp++; | |
247 | } | |
248 | *left = l; | |
249 | return cp; | |
250 | } | |
251 | ||
252 | static int word_char(char ch) | |
253 | { | |
254 | return isalnum(ch) || ch == '_'; | |
255 | } | |
256 | ||
83caecca RZ |
257 | static void show_name(struct grep_opt *opt, const char *name) |
258 | { | |
259 | printf("%s%c", name, opt->null_following_name ? '\0' : '\n'); | |
260 | } | |
261 | ||
83b5d2f5 JH |
262 | static int fixmatch(const char *pattern, char *line, regmatch_t *match) |
263 | { | |
264 | char *hit = strstr(line, pattern); | |
265 | if (!hit) { | |
266 | match->rm_so = match->rm_eo = -1; | |
267 | return REG_NOMATCH; | |
268 | } | |
269 | else { | |
270 | match->rm_so = hit - line; | |
271 | match->rm_eo = match->rm_so + strlen(pattern); | |
272 | return 0; | |
273 | } | |
274 | } | |
275 | ||
a4d7d2c6 JH |
276 | static int strip_timestamp(char *bol, char **eol_p) |
277 | { | |
278 | char *eol = *eol_p; | |
279 | int ch; | |
280 | ||
281 | while (bol < --eol) { | |
282 | if (*eol != '>') | |
283 | continue; | |
284 | *eol_p = ++eol; | |
285 | ch = *eol; | |
286 | *eol = '\0'; | |
287 | return ch; | |
288 | } | |
289 | return 0; | |
290 | } | |
291 | ||
292 | static struct { | |
293 | const char *field; | |
294 | size_t len; | |
295 | } header_field[] = { | |
296 | { "author ", 7 }, | |
297 | { "committer ", 10 }, | |
298 | }; | |
299 | ||
d7eb527d | 300 | static int match_one_pattern(struct grep_pat *p, char *bol, char *eol, |
79212772 RS |
301 | enum grep_context ctx, |
302 | regmatch_t *pmatch, int eflags) | |
83b5d2f5 JH |
303 | { |
304 | int hit = 0; | |
a4d7d2c6 | 305 | int saved_ch = 0; |
83b5d2f5 | 306 | |
480c1ca6 JH |
307 | if ((p->token != GREP_PATTERN) && |
308 | ((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD))) | |
309 | return 0; | |
310 | ||
a4d7d2c6 JH |
311 | if (p->token == GREP_PATTERN_HEAD) { |
312 | const char *field; | |
313 | size_t len; | |
314 | assert(p->field < ARRAY_SIZE(header_field)); | |
315 | field = header_field[p->field].field; | |
316 | len = header_field[p->field].len; | |
317 | if (strncmp(bol, field, len)) | |
318 | return 0; | |
319 | bol += len; | |
320 | saved_ch = strip_timestamp(bol, &eol); | |
321 | } | |
322 | ||
83b5d2f5 | 323 | again: |
79212772 | 324 | if (p->fixed) |
83b5d2f5 | 325 | hit = !fixmatch(p->pattern, bol, pmatch); |
79212772 RS |
326 | else |
327 | hit = !regexec(&p->regexp, bol, 1, pmatch, eflags); | |
83b5d2f5 | 328 | |
d7eb527d | 329 | if (hit && p->word_regexp) { |
83b5d2f5 JH |
330 | if ((pmatch[0].rm_so < 0) || |
331 | (eol - bol) <= pmatch[0].rm_so || | |
332 | (pmatch[0].rm_eo < 0) || | |
333 | (eol - bol) < pmatch[0].rm_eo) | |
334 | die("regexp returned nonsense"); | |
335 | ||
336 | /* Match beginning must be either beginning of the | |
337 | * line, or at word boundary (i.e. the last char must | |
338 | * not be a word char). Similarly, match end must be | |
339 | * either end of the line, or at word boundary | |
340 | * (i.e. the next char must not be a word char). | |
341 | */ | |
fb62eb7f | 342 | if ( ((pmatch[0].rm_so == 0) || |
83b5d2f5 JH |
343 | !word_char(bol[pmatch[0].rm_so-1])) && |
344 | ((pmatch[0].rm_eo == (eol-bol)) || | |
345 | !word_char(bol[pmatch[0].rm_eo])) ) | |
346 | ; | |
347 | else | |
348 | hit = 0; | |
349 | ||
350 | if (!hit && pmatch[0].rm_so + bol + 1 < eol) { | |
351 | /* There could be more than one match on the | |
352 | * line, and the first match might not be | |
353 | * strict word match. But later ones could be! | |
fb62eb7f RS |
354 | * Forward to the next possible start, i.e. the |
355 | * next position following a non-word char. | |
83b5d2f5 JH |
356 | */ |
357 | bol = pmatch[0].rm_so + bol + 1; | |
fb62eb7f RS |
358 | while (word_char(bol[-1]) && bol < eol) |
359 | bol++; | |
360 | if (bol < eol) | |
361 | goto again; | |
83b5d2f5 JH |
362 | } |
363 | } | |
a4d7d2c6 JH |
364 | if (p->token == GREP_PATTERN_HEAD && saved_ch) |
365 | *eol = saved_ch; | |
83b5d2f5 JH |
366 | return hit; |
367 | } | |
368 | ||
d7eb527d RS |
369 | static int match_expr_eval(struct grep_expr *x, char *bol, char *eol, |
370 | enum grep_context ctx, int collect_hits) | |
83b5d2f5 | 371 | { |
0ab7befa | 372 | int h = 0; |
79212772 | 373 | regmatch_t match; |
0ab7befa | 374 | |
83b5d2f5 JH |
375 | switch (x->node) { |
376 | case GREP_NODE_ATOM: | |
79212772 | 377 | h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0); |
83b5d2f5 JH |
378 | break; |
379 | case GREP_NODE_NOT: | |
d7eb527d | 380 | h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0); |
0ab7befa | 381 | break; |
83b5d2f5 | 382 | case GREP_NODE_AND: |
d7eb527d | 383 | if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0)) |
252d560d | 384 | return 0; |
d7eb527d | 385 | h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0); |
0ab7befa | 386 | break; |
83b5d2f5 | 387 | case GREP_NODE_OR: |
0ab7befa | 388 | if (!collect_hits) |
d7eb527d | 389 | return (match_expr_eval(x->u.binary.left, |
0ab7befa | 390 | bol, eol, ctx, 0) || |
d7eb527d | 391 | match_expr_eval(x->u.binary.right, |
0ab7befa | 392 | bol, eol, ctx, 0)); |
d7eb527d | 393 | h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0); |
0ab7befa | 394 | x->u.binary.left->hit |= h; |
d7eb527d | 395 | h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1); |
0ab7befa JH |
396 | break; |
397 | default: | |
d7530708 | 398 | die("Unexpected node type (internal error) %d", x->node); |
83b5d2f5 | 399 | } |
0ab7befa JH |
400 | if (collect_hits) |
401 | x->hit |= h; | |
402 | return h; | |
83b5d2f5 JH |
403 | } |
404 | ||
480c1ca6 | 405 | static int match_expr(struct grep_opt *opt, char *bol, char *eol, |
0ab7befa | 406 | enum grep_context ctx, int collect_hits) |
83b5d2f5 JH |
407 | { |
408 | struct grep_expr *x = opt->pattern_expression; | |
d7eb527d | 409 | return match_expr_eval(x, bol, eol, ctx, collect_hits); |
83b5d2f5 JH |
410 | } |
411 | ||
480c1ca6 | 412 | static int match_line(struct grep_opt *opt, char *bol, char *eol, |
0ab7befa | 413 | enum grep_context ctx, int collect_hits) |
83b5d2f5 JH |
414 | { |
415 | struct grep_pat *p; | |
79212772 RS |
416 | regmatch_t match; |
417 | ||
83b5d2f5 | 418 | if (opt->extended) |
0ab7befa JH |
419 | return match_expr(opt, bol, eol, ctx, collect_hits); |
420 | ||
421 | /* we do not call with collect_hits without being extended */ | |
83b5d2f5 | 422 | for (p = opt->pattern_list; p; p = p->next) { |
79212772 | 423 | if (match_one_pattern(p, bol, eol, ctx, &match, 0)) |
83b5d2f5 JH |
424 | return 1; |
425 | } | |
426 | return 0; | |
427 | } | |
428 | ||
7e8f59d5 RS |
429 | static int match_next_pattern(struct grep_pat *p, char *bol, char *eol, |
430 | enum grep_context ctx, | |
431 | regmatch_t *pmatch, int eflags) | |
432 | { | |
433 | regmatch_t match; | |
434 | ||
435 | if (!match_one_pattern(p, bol, eol, ctx, &match, eflags)) | |
436 | return 0; | |
437 | if (match.rm_so < 0 || match.rm_eo < 0) | |
438 | return 0; | |
439 | if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) { | |
440 | if (match.rm_so > pmatch->rm_so) | |
441 | return 1; | |
442 | if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo) | |
443 | return 1; | |
444 | } | |
445 | pmatch->rm_so = match.rm_so; | |
446 | pmatch->rm_eo = match.rm_eo; | |
447 | return 1; | |
448 | } | |
449 | ||
450 | static int next_match(struct grep_opt *opt, char *bol, char *eol, | |
451 | enum grep_context ctx, regmatch_t *pmatch, int eflags) | |
452 | { | |
453 | struct grep_pat *p; | |
454 | int hit = 0; | |
455 | ||
456 | pmatch->rm_so = pmatch->rm_eo = -1; | |
457 | if (bol < eol) { | |
458 | for (p = opt->pattern_list; p; p = p->next) { | |
459 | switch (p->token) { | |
460 | case GREP_PATTERN: /* atom */ | |
461 | case GREP_PATTERN_HEAD: | |
462 | case GREP_PATTERN_BODY: | |
463 | hit |= match_next_pattern(p, bol, eol, ctx, | |
464 | pmatch, eflags); | |
465 | break; | |
466 | default: | |
467 | break; | |
468 | } | |
469 | } | |
470 | } | |
471 | return hit; | |
472 | } | |
473 | ||
474 | static void show_line(struct grep_opt *opt, char *bol, char *eol, | |
475 | const char *name, unsigned lno, char sign) | |
476 | { | |
477 | int rest = eol - bol; | |
478 | ||
479 | if (opt->null_following_name) | |
480 | sign = '\0'; | |
481 | if (opt->pathname) | |
482 | printf("%s%c", name, sign); | |
483 | if (opt->linenum) | |
484 | printf("%d%c", lno, sign); | |
485 | if (opt->color) { | |
486 | regmatch_t match; | |
487 | enum grep_context ctx = GREP_CONTEXT_BODY; | |
488 | int ch = *eol; | |
489 | int eflags = 0; | |
490 | ||
491 | *eol = '\0'; | |
492 | while (next_match(opt, bol, eol, ctx, &match, eflags)) { | |
493 | printf("%.*s%s%.*s%s", | |
747a322b | 494 | (int)match.rm_so, bol, |
7e8f59d5 | 495 | opt->color_match, |
747a322b | 496 | (int)(match.rm_eo - match.rm_so), bol + match.rm_so, |
7e8f59d5 RS |
497 | GIT_COLOR_RESET); |
498 | bol += match.rm_eo; | |
499 | rest -= match.rm_eo; | |
500 | eflags = REG_NOTBOL; | |
501 | } | |
502 | *eol = ch; | |
503 | } | |
504 | printf("%.*s\n", rest, bol); | |
505 | } | |
506 | ||
0ab7befa JH |
507 | static int grep_buffer_1(struct grep_opt *opt, const char *name, |
508 | char *buf, unsigned long size, int collect_hits) | |
83b5d2f5 JH |
509 | { |
510 | char *bol = buf; | |
511 | unsigned long left = size; | |
512 | unsigned lno = 1; | |
513 | struct pre_context_line { | |
514 | char *bol; | |
515 | char *eol; | |
516 | } *prev = NULL, *pcl; | |
517 | unsigned last_hit = 0; | |
518 | unsigned last_shown = 0; | |
519 | int binary_match_only = 0; | |
520 | const char *hunk_mark = ""; | |
521 | unsigned count = 0; | |
480c1ca6 | 522 | enum grep_context ctx = GREP_CONTEXT_HEAD; |
83b5d2f5 JH |
523 | |
524 | if (buffer_is_binary(buf, size)) { | |
525 | switch (opt->binary) { | |
526 | case GREP_BINARY_DEFAULT: | |
527 | binary_match_only = 1; | |
528 | break; | |
529 | case GREP_BINARY_NOMATCH: | |
530 | return 0; /* Assume unmatch */ | |
531 | break; | |
532 | default: | |
533 | break; | |
534 | } | |
535 | } | |
536 | ||
537 | if (opt->pre_context) | |
538 | prev = xcalloc(opt->pre_context, sizeof(*prev)); | |
539 | if (opt->pre_context || opt->post_context) | |
540 | hunk_mark = "--\n"; | |
541 | ||
542 | while (left) { | |
543 | char *eol, ch; | |
0ab7befa | 544 | int hit; |
83b5d2f5 JH |
545 | |
546 | eol = end_of_line(bol, &left); | |
547 | ch = *eol; | |
548 | *eol = 0; | |
549 | ||
480c1ca6 JH |
550 | if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol)) |
551 | ctx = GREP_CONTEXT_BODY; | |
552 | ||
0ab7befa | 553 | hit = match_line(opt, bol, eol, ctx, collect_hits); |
83b5d2f5 JH |
554 | *eol = ch; |
555 | ||
0ab7befa JH |
556 | if (collect_hits) |
557 | goto next_line; | |
558 | ||
83b5d2f5 JH |
559 | /* "grep -v -e foo -e bla" should list lines |
560 | * that do not have either, so inversion should | |
561 | * be done outside. | |
562 | */ | |
563 | if (opt->invert) | |
564 | hit = !hit; | |
565 | if (opt->unmatch_name_only) { | |
566 | if (hit) | |
567 | return 0; | |
568 | goto next_line; | |
569 | } | |
570 | if (hit) { | |
571 | count++; | |
572 | if (opt->status_only) | |
573 | return 1; | |
574 | if (binary_match_only) { | |
575 | printf("Binary file %s matches\n", name); | |
576 | return 1; | |
577 | } | |
578 | if (opt->name_only) { | |
83caecca | 579 | show_name(opt, name); |
83b5d2f5 JH |
580 | return 1; |
581 | } | |
582 | /* Hit at this line. If we haven't shown the | |
583 | * pre-context lines, we would need to show them. | |
584 | * When asked to do "count", this still show | |
585 | * the context which is nonsense, but the user | |
586 | * deserves to get that ;-). | |
587 | */ | |
588 | if (opt->pre_context) { | |
589 | unsigned from; | |
590 | if (opt->pre_context < lno) | |
591 | from = lno - opt->pre_context; | |
592 | else | |
593 | from = 1; | |
594 | if (from <= last_shown) | |
595 | from = last_shown + 1; | |
596 | if (last_shown && from != last_shown + 1) | |
9db56f71 | 597 | fputs(hunk_mark, stdout); |
83b5d2f5 JH |
598 | while (from < lno) { |
599 | pcl = &prev[lno-from-1]; | |
600 | show_line(opt, pcl->bol, pcl->eol, | |
601 | name, from, '-'); | |
602 | from++; | |
603 | } | |
604 | last_shown = lno-1; | |
605 | } | |
606 | if (last_shown && lno != last_shown + 1) | |
9db56f71 | 607 | fputs(hunk_mark, stdout); |
83b5d2f5 JH |
608 | if (!opt->count) |
609 | show_line(opt, bol, eol, name, lno, ':'); | |
610 | last_shown = last_hit = lno; | |
611 | } | |
612 | else if (last_hit && | |
613 | lno <= last_hit + opt->post_context) { | |
614 | /* If the last hit is within the post context, | |
615 | * we need to show this line. | |
616 | */ | |
617 | if (last_shown && lno != last_shown + 1) | |
9db56f71 | 618 | fputs(hunk_mark, stdout); |
83b5d2f5 JH |
619 | show_line(opt, bol, eol, name, lno, '-'); |
620 | last_shown = lno; | |
621 | } | |
622 | if (opt->pre_context) { | |
623 | memmove(prev+1, prev, | |
624 | (opt->pre_context-1) * sizeof(*prev)); | |
625 | prev->bol = bol; | |
626 | prev->eol = eol; | |
627 | } | |
628 | ||
629 | next_line: | |
630 | bol = eol + 1; | |
631 | if (!left) | |
632 | break; | |
633 | left--; | |
634 | lno++; | |
635 | } | |
636 | ||
b48fb5b6 | 637 | free(prev); |
0ab7befa JH |
638 | if (collect_hits) |
639 | return 0; | |
b48fb5b6 | 640 | |
83b5d2f5 JH |
641 | if (opt->status_only) |
642 | return 0; | |
643 | if (opt->unmatch_name_only) { | |
644 | /* We did not see any hit, so we want to show this */ | |
83caecca | 645 | show_name(opt, name); |
83b5d2f5 JH |
646 | return 1; |
647 | } | |
648 | ||
649 | /* NEEDSWORK: | |
650 | * The real "grep -c foo *.c" gives many "bar.c:0" lines, | |
651 | * which feels mostly useless but sometimes useful. Maybe | |
652 | * make it another option? For now suppress them. | |
653 | */ | |
654 | if (opt->count && count) | |
83caecca RZ |
655 | printf("%s%c%u\n", name, |
656 | opt->null_following_name ? '\0' : ':', count); | |
83b5d2f5 JH |
657 | return !!last_hit; |
658 | } | |
659 | ||
0ab7befa JH |
660 | static void clr_hit_marker(struct grep_expr *x) |
661 | { | |
662 | /* All-hit markers are meaningful only at the very top level | |
663 | * OR node. | |
664 | */ | |
665 | while (1) { | |
666 | x->hit = 0; | |
667 | if (x->node != GREP_NODE_OR) | |
668 | return; | |
669 | x->u.binary.left->hit = 0; | |
670 | x = x->u.binary.right; | |
671 | } | |
672 | } | |
673 | ||
674 | static int chk_hit_marker(struct grep_expr *x) | |
675 | { | |
676 | /* Top level nodes have hit markers. See if they all are hits */ | |
677 | while (1) { | |
678 | if (x->node != GREP_NODE_OR) | |
679 | return x->hit; | |
680 | if (!x->u.binary.left->hit) | |
681 | return 0; | |
682 | x = x->u.binary.right; | |
683 | } | |
684 | } | |
685 | ||
686 | int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long size) | |
687 | { | |
688 | /* | |
689 | * we do not have to do the two-pass grep when we do not check | |
690 | * buffer-wide "all-match". | |
691 | */ | |
692 | if (!opt->all_match) | |
693 | return grep_buffer_1(opt, name, buf, size, 0); | |
694 | ||
695 | /* Otherwise the toplevel "or" terms hit a bit differently. | |
696 | * We first clear hit markers from them. | |
697 | */ | |
698 | clr_hit_marker(opt->pattern_expression); | |
699 | grep_buffer_1(opt, name, buf, size, 1); | |
700 | ||
701 | if (!chk_hit_marker(opt->pattern_expression)) | |
702 | return 0; | |
703 | ||
704 | return grep_buffer_1(opt, name, buf, size, 0); | |
705 | } |