refs: refactor logic to look up storage backends

[thirdparty/git.git] / refs.c

diff --git a/refs.c b/refs.c
index 16bfa21df75e6d6425674817e1e5eb847f1d16b7..dea3d5c9a083a0d42f0b676c0716df0d1a930c2b 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -33,17 +33,33 @@
 /*
  * List of all available backends
  */
-static struct ref_storage_be *refs_backends = &refs_be_files;
+static const struct ref_storage_be *refs_backends[] = {
+       [REF_STORAGE_FORMAT_FILES] = &refs_be_files,
+};
 
-static struct ref_storage_be *find_ref_storage_backend(const char *name)
+static const struct ref_storage_be *find_ref_storage_backend(unsigned int ref_storage_format)
 {
-       struct ref_storage_be *be;
-       for (be = refs_backends; be; be = be->next)
-               if (!strcmp(be->name, name))
-                       return be;
+       if (ref_storage_format < ARRAY_SIZE(refs_backends))
+               return refs_backends[ref_storage_format];
        return NULL;
 }
 
+unsigned int ref_storage_format_by_name(const char *name)
+{
+       for (unsigned int i = 0; i < ARRAY_SIZE(refs_backends); i++)
+               if (refs_backends[i] && !strcmp(refs_backends[i]->name, name))
+                       return i;
+       return REF_STORAGE_FORMAT_UNKNOWN;
+}
+
+const char *ref_storage_format_to_name(unsigned int ref_storage_format)
+{
+       const struct ref_storage_be *be = find_ref_storage_backend(ref_storage_format);
+       if (!be)
+               return "unknown";
+       return be->name;
+}
+
 /*
  * How to handle various characters in refnames:
  * 0: An acceptable character for refs
@@ -2029,12 +2045,12 @@ static struct ref_store *ref_store_init(struct repository *repo,
                                        const char *gitdir,
                                        unsigned int flags)
 {
-       const char *be_name = "files";
-       struct ref_storage_be *be = find_ref_storage_backend(be_name);
+       unsigned int format = REF_STORAGE_FORMAT_FILES;
+       const struct ref_storage_be *be = find_ref_storage_backend(format);
        struct ref_store *refs;
 
        if (!be)
-               BUG("reference backend %s is unknown", be_name);
+               BUG("reference backend is unknown");
 
        refs = be->init(repo, gitdir, flags);
        return refs;