add alloc_ref_with_prefix()

In three cases in remote.c, a "raw" ref is allocated using alloc_ref()
and then its is constructed using sprintf().  Clean it up by adding a
helper function, alloc_ref_with_prefix(), which creates a composite
name.  Use it in alloc_ref_from_str(), too, as it simplifies the code.

Open code alloc_ref() in alloc_ref_with_prefix(), as the former is
going to be removed in the patch after the next.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/remote.c b/remote.c
index 8a04066d6142823183033aaff8754febe31ad1b0..98cbcf94c3535404c4138a6e5b80da97cb3294f2 100644 (file)
--- a/remote.c
+++ b/remote.c
@@ -749,6 +749,16 @@ int remote_find_tracking(struct remote *remote, struct refspec *refspec)
        return -1;
 }
 
+static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
+               const char *name)
+{
+       size_t len = strlen(name);
+       struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
+       memcpy(ref->name, prefix, prefixlen);
+       memcpy(ref->name + prefixlen, name, len);
+       return ref;
+}
+
 struct ref *alloc_ref(unsigned namelen)
 {
        struct ref *ret = xcalloc(1, sizeof(struct ref) + namelen);
@@ -757,9 +767,7 @@ struct ref *alloc_ref(unsigned namelen)
 
 struct ref *alloc_ref_from_str(const char* str)
 {
-       struct ref *ret = alloc_ref(strlen(str) + 1);
-       strcpy(ret->name, str);
-       return ret;
+       return alloc_ref_with_prefix("", 0, str);
 }
 
 static struct ref *copy_ref(const struct ref *ref)
@@ -1152,10 +1160,8 @@ static struct ref *get_expanded_map(const struct ref *remote_refs,
                        struct ref *cpy = copy_ref(ref);
                        match = ref->name + remote_prefix_len;
 
-                       cpy->peer_ref = alloc_ref(local_prefix_len +
-                                                 strlen(match) + 1);
-                       sprintf(cpy->peer_ref->name, "%s%s",
-                               refspec->dst, match);
+                       cpy->peer_ref = alloc_ref_with_prefix(refspec->dst,
+                                       local_prefix_len, match);
                        if (refspec->force)
                                cpy->peer_ref->force = 1;
                        *tail = cpy;
@@ -1188,7 +1194,6 @@ struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
 
 static struct ref *get_local_ref(const char *name)
 {
-       struct ref *ret;
        if (!name)
                return NULL;
 
@@ -1198,15 +1203,10 @@ static struct ref *get_local_ref(const char *name)
 
        if (!prefixcmp(name, "heads/") ||
            !prefixcmp(name, "tags/") ||
-           !prefixcmp(name, "remotes/")) {
-               ret = alloc_ref(strlen(name) + 6);
-               sprintf(ret->name, "refs/%s", name);
-               return ret;
-       }
+           !prefixcmp(name, "remotes/"))
+               return alloc_ref_with_prefix("refs/", 5, name);
 
-       ret = alloc_ref(strlen(name) + 12);
-       sprintf(ret->name, "refs/heads/%s", name);
-       return ret;
+       return alloc_ref_with_prefix("refs/heads/", 11, name);
 }
 
 int get_fetch_map(const struct ref *remote_refs,