mbrtowc: Tiny optimization.

* lib/mbrtowc.c (mbrtowc): Delay pstate assignment until it is needed.

2 files changed, 9 insertions, 3 deletions

diff --git a/ChangeLog b/ChangeLog
index 289730afdc..dbdc5303b5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2011-02-20  Bruno Haible  <bruno@clisp.org>
+
+	mbrtowc: Tiny optimization.
+	* lib/mbrtowc.c (mbrtowc): Delay pstate assignment until it is needed.
+
 2011-02-20  Jim Meyering  <meyering@redhat.com>
 
 	test-exclude.c: remove unmatched #endif
diff --git a/lib/mbrtowc.c b/lib/mbrtowc.c
index 0546f6db7a..d9c25cced6 100644
--- a/lib/mbrtowc.c
+++ b/lib/mbrtowc.c
@@ -40,9 +40,6 @@ mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
 {
   char *pstate = (char *)ps;
 
-  if (pstate == NULL)
-    pstate = internal_state;
-
   if (s == NULL)
     {
       pwc = NULL;
@@ -54,6 +51,10 @@ mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
     return (size_t)(-2);
 
   /* Here n > 0.  */
+
+  if (pstate == NULL)
+    pstate = internal_state;
+
   {
     size_t nstate = pstate[0];
     char buf[4];