Allow mbrtowc() and wcrtomb() to be implemented directly, instead of

as wrappers around the deprecated 4.4BSD rune functions. This paves the
way for state-dependent encodings, which the rune API does not support.
- Add __emulated_sgetrune() and __emulated_sputrune(), which are
  implementations of sgetrune() and sputrune() in terms of
  mbrtowc() and wcrtomb().
- Rename the old rune-wrapper mbrtowc() and wcrtomb() functions to
  __emulated_mbrtowc() and __emulated_wcrtomb().
- Add __mbrtowc and __wcrtomb function pointers, which point to the
  current locale's conversion functions, or the __emulated versions.
- Implement mbrtowc() and wcrtomb() as calls to these function pointers.
- Make the "NONE" encoding implement mbrtowc() and wcrtomb() directly.

All of this emulation mess will be removed, together with rune support,
in FreeBSD 6.

1 files changed, 18 insertions, 3 deletions

diff --git a/lib/libc/locale/mbrtowc.c b/lib/libc/locale/mbrtowc.c
index 7e4d90ef12ab..e99308242a8c 100644
--- a/lib/libc/locale/mbrtowc.c
+++ b/lib/libc/locale/mbrtowc.c
@@ -1,5 +1,5 @@
 /*-
- * Copyright (c) 2002 Tim J. Robbins.
+ * Copyright (c) 2002, 2003 Tim J. Robbins.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -32,9 +32,24 @@ __FBSDID("$FreeBSD$");
 #include <stdlib.h>
 #include <wchar.h>
 
+extern size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict,
+    size_t, mbstate_t * __restrict);
+
+size_t
+mbrtowc(wchar_t * __restrict pwc, const char * __restrict s,
+    size_t n, mbstate_t * __restrict ps)
+{
+
+	return (__mbrtowc(pwc, s, n, ps));
+}
+
+/*
+ * Emulate the ISO C mbrtowc() function in terms of the deprecated
+ * 4.4BSD sgetrune() function.
+ */
 size_t
-mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
-    mbstate_t * __restrict ps __unused)
+__emulated_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s,
+    size_t n, mbstate_t * __restrict ps __unused)
 {
         const char *e;
         rune_t r;