-extern int head_ref(each_ref_fn fn, void *cb_data);
-extern int for_each_ref(each_ref_fn fn, void *cb_data);
-extern int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data);
-extern int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data, unsigned int broken);
-extern int for_each_tag_ref(each_ref_fn fn, void *cb_data);
-extern int for_each_branch_ref(each_ref_fn fn, void *cb_data);
-extern int for_each_remote_ref(each_ref_fn fn, void *cb_data);
-extern int for_each_replace_ref(each_ref_fn fn, void *cb_data);
-extern int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data);
-extern int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, const char *prefix, void *cb_data);
-
-extern int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
-extern int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
-extern int for_each_ref_in_submodule(const char *submodule, const char *prefix,
+int head_ref(each_ref_fn fn, void *cb_data);
+int for_each_ref(each_ref_fn fn, void *cb_data);
+int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data);
+int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data,
+ unsigned int broken);
+int for_each_tag_ref(each_ref_fn fn, void *cb_data);
+int for_each_branch_ref(each_ref_fn fn, void *cb_data);
+int for_each_remote_ref(each_ref_fn fn, void *cb_data);
+int for_each_replace_ref(each_ref_fn fn, void *cb_data);
+int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data);
+int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
+ const char *prefix, void *cb_data);
+
+int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
+int for_each_ref_submodule(const char *submodule,
+ each_ref_fn fn, void *cb_data);
+int for_each_ref_in_submodule(const char *submodule, const char *prefix,