BZ #15969: search locale archive again after alias expansion

If a locale alias is defined in locale.alias but not in an archive,
and the referenced locale is only present in the archive, setlocale
will fail if given the alias name.  This is unintuitive.  This patch
fixes it, arranging for the locale archive to be searched again after
alias expansion.

for  ChangeLog

	[BZ #15969]
	* locale/findlocale.c (_nl_find_locale): Retry archive search
	after alias expansion.

1 files changed, 15 insertions, 4 deletions

diff --git a/locale/findlocale.c b/locale/findlocale.c
index ab879d7775..360f58b904 100644
--- a/locale/findlocale.c
+++ b/locale/findlocale.c
@@ -156,15 +156,26 @@ _nl_find_locale (const char *locale_path, size_t locale_path_len,
       if (__glibc_likely (data != NULL))
 	return data;
 
+      /* Nothing in the archive with the given name.  Expanding it as
+	 an alias and retry.  */
+      loc_name = (char *) _nl_expand_alias (*name);
+      if (loc_name != NULL)
+	{
+	  data = _nl_load_locale_from_archive (category, &loc_name);
+	  if (__builtin_expect (data != NULL, 1))
+	    return data;
+	}
+
       /* Nothing in the archive.  Set the default path to search below.  */
       locale_path = _nl_default_locale_path;
       locale_path_len = sizeof _nl_default_locale_path;
     }
+  else
+    /* We really have to load some data.  First see whether the name is
+       an alias.  Please note that this makes it impossible to have "C"
+       or "POSIX" as aliases.  */
+    loc_name = (char *) _nl_expand_alias (*name);
 
-  /* We really have to load some data.  First see whether the name is
-     an alias.  Please note that this makes it impossible to have "C"
-     or "POSIX" as aliases.  */
-  loc_name = (char *) _nl_expand_alias (*name);
   if (loc_name == NULL)
     /* It is no alias.  */
     loc_name = (char *) *name;