3 files changed, 30 insertions, 3 deletions
diff --git a/wcsmbs/btowc.c b/wcsmbs/btowc.c
index 1ba0221403..6add7ed8bb 100644
--- a/wcsmbs/btowc.c
+++ b/wcsmbs/btowc.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1996,1997,1998,1999,2000,2002 Free Software Foundation, Inc.
+/* Copyright (C) 1996-2000,2002,2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.
 
@@ -17,6 +17,7 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
+#include <ctype.h>
 #include <dlfcn.h>
 #include <gconv.h>
 #include <stdio.h>
@@ -37,6 +38,11 @@ __btowc (c)
   if (c < SCHAR_MIN || c > UCHAR_MAX || c == EOF)
     return WEOF;
 
+  /* We know that only ASCII compatible encodings are used for the
+     locale and that the wide character encoding is ISO 10646.  */
+  if (isascii (c))
+    return (wint_t) c;
+
   /* Get the conversion functions.  */
   fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
 
diff --git a/wcsmbs/wchar.h b/wcsmbs/wchar.h
index 1fe7e94d92..fe4ee80bff 100644
--- a/wcsmbs/wchar.h
+++ b/wcsmbs/wchar.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1995-2002, 2003, 2004 Free Software Foundation, Inc.
+/* Copyright (C) 1995-2004, 2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -320,6 +320,22 @@ __END_NAMESPACE_C99
 
 #ifdef __USE_EXTERN_INLINES
 /* Define inline function as optimization.  */
+
+/* We can use the BTOWC and WCTOB optimizations since we know that all
+   locales must use ASCII encoding for the values in the ASCII range
+   and because the wchar_t encoding is always ISO 10646.  */
+extern wint_t __btowc_alias (int __c) __asm ("btowc");
+extern __inline wint_t
+__NTH (btowc (int __c))
+{ return (__builtin_constant_p (__c) && __c >= '\0' && __c <= '\x7f'
+	  ? (wint_t) __c : __btowc_alias (__c)); }
+
+extern int __wctob_alias (wint_t __c) __asm ("wctob");
+extern __inline int
+__NTH (wctob (wint_t __wc))
+{ return (__builtin_constant_p (__wc) && __wc >= L'\0' && __wc <= L'\x7f'
+	  ? (int) __wc : __wctob_alias (__wc)); }
+
 extern __inline size_t
 __NTH (mbrlen (__const char *__restrict __s, size_t __n,
 	       mbstate_t *__restrict __ps))
diff --git a/wcsmbs/wctob.c b/wcsmbs/wctob.c
index 854a3f25db..0f241577a4 100644
--- a/wcsmbs/wctob.c
+++ b/wcsmbs/wctob.c
@@ -40,6 +40,11 @@ wctob (c)
   if (c == WEOF)
     return EOF;
 
+  /* We know that only ASCII compatible encodings are used for the
+     locale and that the wide character encoding is ISO 10646.  */
+  if (c >= L'\0' && c <= L'\x7f')
+    return (int) c;
+
   /* Tell where we want the result.  */
   data.__outbuf = buf;
   data.__outbufend = buf + MB_LEN_MAX;
@@ -69,5 +74,5 @@ wctob (c)
       || data.__outbuf != (unsigned char *) (buf + 1))
     return EOF;
 
-  return (unsigned char) buf[0];
+  return buf[0];
 }