diff options
| -rw-r--r-- | grep.c | 40 | ||||
| -rw-r--r-- | grep.h | 1 |
2 files changed, 33 insertions, 8 deletions
@@ -28,9 +28,31 @@ void append_grep_pattern(struct grep_opt *opt, const char *pat, p->next = NULL; } +static int isregexspecial(int c) +{ + return isspecial(c) || c == '$' || c == '(' || c == ')' || c == '+' || + c == '.' || c == '^' || c == '{' || c == '|'; +} + +static int is_fixed(const char *s) +{ + while (!isregexspecial(*s)) + s++; + return !*s; +} + static void compile_regexp(struct grep_pat *p, struct grep_opt *opt) { - int err = regcomp(&p->regexp, p->pattern, opt->regflags); + int err; + + if (opt->fixed || is_fixed(p->pattern)) + p->fixed = 1; + if (opt->regflags & REG_ICASE) + p->fixed = 0; + if (p->fixed) + return; + + err = regcomp(&p->regexp, p->pattern, opt->regflags); if (err) { char errbuf[1024]; char where[1024]; @@ -159,8 +181,7 @@ void compile_grep_patterns(struct grep_opt *opt) case GREP_PATTERN: /* atom */ case GREP_PATTERN_HEAD: case GREP_PATTERN_BODY: - if (!opt->fixed) - compile_regexp(p, opt); + compile_regexp(p, opt); break; default: opt->extended = 1; @@ -294,7 +315,6 @@ static struct { static int match_one_pattern(struct grep_opt *opt, struct grep_pat *p, char *bol, char *eol, enum grep_context ctx) { int hit = 0; - int at_true_bol = 1; int saved_ch = 0; regmatch_t pmatch[10]; @@ -315,7 +335,7 @@ static int match_one_pattern(struct grep_opt *opt, struct grep_pat *p, char *bol } again: - if (!opt->fixed) { + if (!p->fixed) { regex_t *exp = &p->regexp; hit = !regexec(exp, bol, ARRAY_SIZE(pmatch), pmatch, 0); @@ -337,7 +357,7 @@ static int match_one_pattern(struct grep_opt *opt, struct grep_pat *p, char *bol * either end of the line, or at word boundary * (i.e. the next char must not be a word char). */ - if ( ((pmatch[0].rm_so == 0 && at_true_bol) || + if ( ((pmatch[0].rm_so == 0) || !word_char(bol[pmatch[0].rm_so-1])) && ((pmatch[0].rm_eo == (eol-bol)) || !word_char(bol[pmatch[0].rm_eo])) ) @@ -349,10 +369,14 @@ static int match_one_pattern(struct grep_opt *opt, struct grep_pat *p, char *bol /* There could be more than one match on the * line, and the first match might not be * strict word match. But later ones could be! + * Forward to the next possible start, i.e. the + * next position following a non-word char. */ bol = pmatch[0].rm_so + bol + 1; - at_true_bol = 0; - goto again; + while (word_char(bol[-1]) && bol < eol) + bol++; + if (bol < eol) + goto again; } } if (p->token == GREP_PATTERN_HEAD && saved_ch) @@ -30,6 +30,7 @@ struct grep_pat { const char *pattern; enum grep_header_field field; regex_t regexp; + unsigned fixed:1; }; enum grep_expr_node { |