Merge branch 'rs/fgrep'

diff --git a/grep.c b/grep.c
index 600f69f2fe2a0271f4bdf736f95f70c8f7381aa4..6485760ff30e0575ee13b43fc8c7fb8e2e291346 100644 (file)
--- a/grep.c
+++ b/grep.c
@@ -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)
@@ -395,7 +419,7 @@ static int match_expr_eval(struct grep_opt *o,
                h |= match_expr_eval(o, x->u.binary.right, bol, eol, ctx, 1);
                break;
        default:
-               die("Unexpected node type (internal error) %d\n", x->node);
+               die("Unexpected node type (internal error) %d", x->node);
        }
        if (collect_hits)
                x->hit |= h;