major abi changes:

* introduce the mbstate_t typedef.
impacts gnu libiconv, which has already been taken care of.
* Prepare for mb stuff to really exist, replace macro MB_CUR_MAX with
an external variable __mb_cur_max (impacts libX11 and various ports).
* use mbstate in all the mb <-> wchar functions with state.
* add a stub iswctype function allowing some ports to compile.
bash and gdiff are missing wcscoll, and need to be told there's no i18n
until this is fixed.
Discussed and matthieu, otto, millert, kettenis, deraadt.
Major libc bump

src/include/stddef.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: stddef.h,v 1.7 2005/04/14 20:59:10 espie Exp $	*/
+/*	$OpenBSD: stddef.h,v 1.8 2005/05/11 18:44:12 espie Exp $	*/
 /*	$NetBSD: stddef.h,v 1.4 1994/10/26 00:56:26 cgd Exp $	*/
 
 /*-
@@ -57,6 +57,11 @@ typedef	_BSD_WINT_T_	wint_t;
 #undef	_BSD_WINT_T_
 #endif
 
+#ifdef	_BSD_MBSTATE_T_
+typedef	_BSD_MBSTATE_T_	mbstate_t;
+#undef	_BSD_MBSTATE_T_
+#endif
+
 #ifndef	NULL
 #ifdef 	__GNUG__
 #define NULL	__null

src/include/stdlib.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: stdlib.h,v 1.32 2004/08/03 19:59:42 millert Exp $	*/
+/*	$OpenBSD: stdlib.h,v 1.33 2005/05/11 18:44:12 espie Exp $	*/
 /*	$NetBSD: stdlib.h,v 1.25 1995/12/27 21:19:08 jtc Exp $	*/
 
 /*-
@@ -84,7 +84,8 @@ typedef struct {
 
 #define	RAND_MAX	0x7fffffff
 
-#define	MB_CUR_MAX	1	/* XXX */
+extern size_t	__mb_cur_max;
+#define	MB_CUR_MAX	__mb_cur_max
 
 #include <sys/cdefs.h>
 

src/include/wchar.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: wchar.h,v 1.1 2005/04/14 20:59:10 espie Exp $	*/
+/*	$OpenBSD: wchar.h,v 1.2 2005/05/11 18:44:12 espie Exp $	*/
 /*	$NetBSD: wchar.h,v 1.16 2003/03/07 07:11:35 tshiozak Exp $	*/
 
 /*-
@@ -84,6 +84,11 @@ typedef	_BSD_WCHAR_T_	wchar_t;
 #undef	_BSD_WCHAR_T_
 #endif
 
+#ifdef	_BSD_MBSTATE_T_
+typedef	_BSD_MBSTATE_T_	mbstate_t;
+#undef	_BSD_MBSTATE_T_
+#endif
+
 #ifdef	_BSD_WINT_T_
 typedef	_BSD_WINT_T_	wint_t;
 #undef	_BSD_WINT_T_
@@ -99,6 +104,14 @@ typedef	_BSD_SIZE_T_	size_t;
 #endif
 
 __BEGIN_DECLS
+wint_t	btowc(int);
+size_t	mbrlen(const char * __restrict, size_t, mbstate_t * __restrict);
+size_t	mbrtowc(wchar_t * __restrict, const char * __restrict, size_t,
+	    mbstate_t * __restrict);
+int	mbsinit(const mbstate_t *);
+size_t	mbsrtowcs(wchar_t * __restrict, const char ** __restrict, size_t,
+	    mbstate_t * __restrict);
+size_t	wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);
 wchar_t	*wcscat(wchar_t * __restrict, const wchar_t * __restrict);
 wchar_t	*wcschr(const wchar_t *, wchar_t);
 int	wcscmp(const wchar_t *, const wchar_t *);
@@ -113,6 +126,8 @@ wchar_t	*wcsncpy(wchar_t * __restrict , const wchar_t * __restrict,
 	    size_t);
 wchar_t	*wcspbrk(const wchar_t *, const wchar_t *);
 wchar_t	*wcsrchr(const wchar_t *, wchar_t);
+size_t	wcsrtombs(char * __restrict, const wchar_t ** __restrict, size_t,
+	    mbstate_t * __restrict);
 size_t	wcsspn(const wchar_t *, const wchar_t *);
 wchar_t	*wcsstr(const wchar_t *, const wchar_t *);
 wchar_t *wcstok(wchar_t * __restrict, const wchar_t * __restrict,
@@ -128,6 +143,7 @@ wchar_t	*wmemset(wchar_t *, wchar_t, size_t);
 
 size_t	wcslcat(wchar_t *, const wchar_t *, size_t);
 size_t	wcslcpy(wchar_t *, const wchar_t *, size_t);
+int	wctob(wint_t);
 __END_DECLS
 
 #endif /* !_WCHAR_H_ */

src/include/wctype.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: wctype.h,v 1.2 2005/04/30 09:14:23 espie Exp $	*/
+/*	$OpenBSD: wctype.h,v 1.3 2005/05/11 18:44:12 espie Exp $	*/
 /*	$NetBSD: wctype.h,v 1.5 2003/03/02 22:18:11 tshiozak Exp $	*/
 
 /*-
@@ -69,6 +69,8 @@ int	iswupper(wint_t);
 int	iswxdigit(wint_t);
 wint_t	towlower(wint_t);
 wint_t	towupper(wint_t);
+int	iswctype(wint_t, wctype_t);
+wctype_t	wctype(const char *);
 __END_DECLS
 
 #endif		/* _WCTYPE_H_ */

src/lib/libc/stdlib/Makefile.inc

@@ -6,7 +6,7 @@
 SRCS+=	a64l.c abort.c atexit.c atoi.c atof.c atol.c atoll.c bsearch.c \
 	calloc.c cfree.c exit.c ecvt.c gcvt.c getenv.c getopt_long.c \
 	getsubopt.c hcreate.c heapsort.c l64a.c llabs.c lsearch.c malloc.c \
-	merge.c multibyte.c putenv.c qsort.c radixsort.c rand.c random.c \
+	merge.c putenv.c qsort.c radixsort.c rand.c random.c \
 	realpath.c setenv.c strtod.c strtol.c strtoll.c strtonum.c strtoul.c \
 	strtoull.c system.c \
 	tfind.c tsearch.c _rand48.c drand48.c erand48.c jrand48.c lcong48.c \