-/* Extract from NAME, which has the form "[user][:.][group]",
- a USERNAME, UID U, GROUPNAME, and GID G.
- Either user or group, or both, must be present.
- If the group is omitted but the ":" separator is given,
- use the given user's login group.
- If SPEC_ARG contains a `:', then use that as the separator, ignoring
- any `.'s. If there is no `:', but there is a `.', then first look
- up the entire SPEC_ARG as a login name. If that look-up fails, then
- try again interpreting the `.' as a separator.
-
- USERNAME and GROUPNAME will be in newly malloc'd memory.
- Either one might be NULL instead, indicating that it was not
- given and the corresponding numeric ID was left unchanged.
-
- Return NULL if successful, a static error message string if not. */
-
-const char *
-parse_user_spec (const char *spec_arg, uid_t *uid, gid_t *gid,
- char **username_arg, char **groupname_arg)
+static char const *
+parse_with_separator (char const *spec, char const *separator,
+ uid_t *uid, gid_t *gid,
+ char **username, char **groupname)