builtin-grep: -F (--fixed-strings)

[git.git] / builtin-grep.c

diff --git a/builtin-grep.c b/builtin-grep.c
index d290074af28e0eb84fac25011da67a5ddd02b798..fead35662944070f8502ed0484fe6b6085d7ac86 100644 (file)
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -98,6 +98,7 @@ struct grep_opt {
        unsigned unmatch_name_only:1;
        unsigned count:1;
        unsigned word_regexp:1;
+       unsigned fixed:1;
 #define GREP_BINARY_DEFAULT    0
 #define GREP_BINARY_NOMATCH    1
 #define GREP_BINARY_TEXT       2
@@ -179,6 +180,20 @@ static int buffer_is_binary(const char *ptr, unsigned long size)
        return 0;
 }
 
+static int fixmatch(const char *pattern, char *line, regmatch_t *match)
+{
+       char *hit = strstr(line, pattern);
+       if (!hit) {
+               match->rm_so = match->rm_eo = -1;
+               return REG_NOMATCH;
+       }
+       else {
+               match->rm_so = hit - line;
+               match->rm_eo = match->rm_so + strlen(pattern);
+               return 0;
+       }
+}
+
 static int grep_buffer(struct grep_opt *opt, const char *name,
                       char *buf, unsigned long size)
 {
@@ -224,9 +239,14 @@ static int grep_buffer(struct grep_opt *opt, const char *name,
                *eol = 0;
 
                for (p = opt->pattern_list; p; p = p->next) {
-                       regex_t *exp = &p->regexp;
-                       hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
-                                      pmatch, 0);
+                       if (!opt->fixed) {
+                               regex_t *exp = &p->regexp;
+                               hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
+                                              pmatch, 0);
+                       }
+                       else {
+                               hit = !fixmatch(p->pattern, bol, pmatch);
+                       }
 
                        if (hit && opt->word_regexp) {
                                /* Match beginning must be either
@@ -241,10 +261,10 @@ static int grep_buffer(struct grep_opt *opt, const char *name,
                                        die("regexp returned nonsense");
                                if (pmatch[0].rm_so != 0 &&
                                    word_char(bol[pmatch[0].rm_so-1]))
-                                       continue; /* not a word boundary */
-                               if ((eol-bol) < pmatch[0].rm_eo &&
+                                       hit = 0;
+                               if (pmatch[0].rm_eo != (eol-bol) &&
                                    word_char(bol[pmatch[0].rm_eo]))
-                                       continue; /* not a word boundary */
+                                       hit = 0;
                        }
                        if (hit)
                                break;
@@ -549,6 +569,11 @@ int cmd_grep(int argc, const char **argv, char **envp)
                        opt.regflags |= REG_EXTENDED;
                        continue;
                }
+               if (!strcmp("-F", arg) ||
+                   !strcmp("--fixed-strings", arg)) {
+                       opt.fixed = 1;
+                       continue;
+               }
                if (!strcmp("-G", arg) ||
                    !strcmp("--basic-regexp", arg)) {
                        opt.regflags &= ~REG_EXTENDED;
@@ -674,7 +699,10 @@ int cmd_grep(int argc, const char **argv, char **envp)
 
        if (!opt.pattern_list)
                die("no pattern given.");
-       compile_patterns(&opt);
+       if ((opt.regflags != REG_NEWLINE) && opt.fixed)
+               die("cannot mix --fixed-strings and regexp");
+       if (!opt.fixed)
+               compile_patterns(&opt);
 
        /* Check revs and then paths */
        for (i = 1; i < argc; i++) {