gen_scanf_fmt(): delete function and use snprintf() instead

To replace "%.*s" with "%s", all we have to do is use snprintf()
to interpolate "%s" into the pattern.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/refs.c b/refs.c
index 7ac3043f88704040bdfb06ee1d811f9af8ba66ef..5e54af267abf91646e754b283c9b89f5dc2ca1bb 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -3334,29 +3334,6 @@ int update_refs(const char *action, const struct ref_update **updates_orig,
        return ret;
 }
 
-/*
- * generate a format suitable for scanf from a ref_rev_parse_rules
- * rule, that is replace the "%.*s" spec with a "%s" spec
- */
-static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
-{
-       char *spec;
-
-       spec = strstr(rule, "%.*s");
-       if (!spec || strstr(spec + 4, "%.*s"))
-               die("invalid rule in ref_rev_parse_rules: %s", rule);
-
-       /* copy all until spec */
-       strncpy(scanf_fmt, rule, spec - rule);
-       scanf_fmt[spec - rule] = '\0';
-       /* copy new spec */
-       strcat(scanf_fmt, "%s");
-       /* copy remaining rule */
-       strcat(scanf_fmt, spec + 4);
-
-       return;
-}
-
 char *shorten_unambiguous_ref(const char *refname, int strict)
 {
        int i;
@@ -3364,8 +3341,13 @@ char *shorten_unambiguous_ref(const char *refname, int strict)
        static int nr_rules;
        char *short_name;
 
-       /* pre generate scanf formats from ref_rev_parse_rules[] */
        if (!nr_rules) {
+               /*
+                * Pre-generate scanf formats from ref_rev_parse_rules[].
+                * Generate a format suitable for scanf from a
+                * ref_rev_parse_rules rule by interpolating "%s" at the
+                * location of the "%.*s".
+                */
                size_t total_len = 0;
                size_t offset = 0;
 
@@ -3378,9 +3360,10 @@ char *shorten_unambiguous_ref(const char *refname, int strict)
 
                offset = 0;
                for (i = 0; i < nr_rules; i++) {
+                       assert(offset < total_len);
                        scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset;
-                       gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]);
-                       offset += strlen(ref_rev_parse_rules[i]);
+                       offset += snprintf(scanf_fmts[i], total_len - offset,
+                                          ref_rev_parse_rules[i], 2, "%s") + 1;
                }
        }