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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

/*	$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 $	*/

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)stdlib.h	5.13 (Berkeley) 6/4/91
 */

#ifndef _STDLIB_H_
#define _STDLIB_H_
#include <machine/ansi.h>

#if !defined(_ANSI_SOURCE)	/* for quad_t, etc. */
#include <sys/types.h>
#endif

#ifdef	_BSD_SIZE_T_
typedef	_BSD_SIZE_T_	size_t;
#undef	_BSD_SIZE_T_
#endif

#ifdef	_BSD_WCHAR_T_
/* in C++, wchar_t is a built-in type */
#ifndef __cplusplus
typedef	_BSD_WCHAR_T_	wchar_t;
#endif
#undef	_BSD_WCHAR_T_
#endif

typedef struct {
	int quot;		/* quotient */
	int rem;		/* remainder */
} div_t;

typedef struct {
	long quot;		/* quotient */
	long rem;		/* remainder */
} ldiv_t;

#if !defined(_ANSI_SOURCE)
typedef struct {
	quad_t quot;		/* quotient */
	quad_t rem;		/* remainder */
} qdiv_t;
#endif


#ifndef	NULL
#ifdef 	__GNUG__
#define NULL	__null
#else
#define	NULL	0L
#endif
#endif

#define	EXIT_FAILURE	1
#define	EXIT_SUCCESS	0

#define	RAND_MAX	0x7fffffff

extern size_t	__mb_cur_max;
#define	MB_CUR_MAX	__mb_cur_max

#include <sys/cdefs.h>

/*
 * Some header files may define an abs macro.
 * If defined, undef it to prevent a syntax error and issue a warning.
 */
#ifdef abs
#undef abs
#warning abs macro collides with abs() prototype, undefining
#endif

__BEGIN_DECLS
__dead void	 abort(void);
int	 abs(int);
int	 atexit(void (*)(void));
double	 atof(const char *);
int	 atoi(const char *);
long	 atol(const char *);
long long atoll(const char *);
void	*bsearch(const void *, const void *, size_t, size_t,
	    int (*)(const void *, const void *));
void	*calloc(size_t, size_t);
div_t	 div(int, int);
char	*ecvt(double, int, int *, int *);
__dead void	 exit(int);
__dead void	 _Exit(int);
char	*fcvt(double, int, int *, int *);
void	 free(void *);
char	*gcvt(double, int, char *);
char	*getenv(const char *);
long	 labs(long);
ldiv_t	 ldiv(long, long);
long long
	 llabs(long long);
void	*malloc(size_t);
void	 qsort(void *, size_t, size_t, int (*)(const void *, const void *));
int	 rand(void);
int	 rand_r(unsigned int *);
void	*realloc(void *, size_t);
void	 srand(unsigned);
double	 strtod(const char *, char **);
long	 strtol(const char *, char **, int);
long long
	 strtoll(const char *, char **, int);
long long
	 strtonum(const char *, long long, long long, const char **);
unsigned long
	 strtoul(const char *, char **, int);
unsigned long long
	 strtoull(const char *, char **, int);
int	 system(const char *);

/* these are currently just stubs */
int	 mblen(const char *, size_t);
size_t	 mbstowcs(wchar_t *, const char *, size_t);
int	 wctomb(char *, wchar_t);
int	 mbtowc(wchar_t *, const char *, size_t);
size_t	 wcstombs(char *, const wchar_t *, size_t);

#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
#if defined(alloca) && (alloca == __builtin_alloca) && (__GNUC__ < 2)
void  *alloca(int);     /* built-in for gcc */ 
#else 
void  *alloca(size_t); 
#endif /* __GNUC__ */ 

char	*getbsize(int *, long *);
char	*cgetcap(char *, const char *, int);
int	 cgetclose(void);
int	 cgetent(char **, char **, const char *);
int	 cgetfirst(char **, char **);
int	 cgetmatch(char *, const char *);
int	 cgetnext(char **, char **);
int	 cgetnum(char *, const char *, long *);
int	 cgetset(const char *);
int	 cgetusedb(int);
int	 cgetstr(char *, const char *, char **);
int	 cgetustr(char *, const char *, char **);

int	 daemon(int, int);
char	*devname(int, int);
int	 getloadavg(double [], int);

long	 a64l(const char *);
char	*l64a(long);

void	 cfree(void *);

#ifndef _GETOPT_DEFINED_
#define _GETOPT_DEFINED_
int	 getopt(int, char * const *, const char *);
extern	 char *optarg;			/* getopt(3) external variables */
extern	 int opterr;
extern	 int optind;
extern	 int optopt;
extern	 int optreset;
int	 getsubopt(char **, char * const *, char **);
extern	 char *suboptarg;		/* getsubopt(3) external variable */
#endif /* _GETOPT_DEFINED_ */

int	 heapsort(void *, size_t, size_t, int (*)(const void *, const void *));
int	 mergesort(void *, size_t, size_t, int (*)(const void *, const void *));
int	 radixsort(const unsigned char **, int, const unsigned char *,
	    unsigned);
int	 sradixsort(const unsigned char **, int, const unsigned char *,
	    unsigned);

char	*initstate(unsigned int, char *, size_t)
		__attribute__((__bounded__ (__string__,2,3)));
long	 random(void);
char	*realpath(const char *, char *);
char	*setstate(const char *);
void	 srandom(unsigned int);
void	 srandomdev(void);

int	 putenv(const char *);
int	 setenv(const char *, const char *, int);
void	 unsetenv(const char *);
void	 setproctitle(const char *, ...)
	__attribute__((__format__ (__printf__, 1, 2)));

quad_t	 qabs(quad_t);
qdiv_t	 qdiv(quad_t, quad_t);
quad_t	 strtoq(const char *, char **, int);
u_quad_t strtouq(const char *, char **, int);

double	 drand48(void);
double	 erand48(unsigned short[3]);
long	 jrand48(unsigned short[3]);
void	 lcong48(unsigned short[7]);
long	 lrand48(void);
long	 mrand48(void);
long	 nrand48(unsigned short[3]);
unsigned short *seed48(unsigned short[3]);
void	 srand48(long);

u_int32_t arc4random(void);
void	arc4random_stir(void);
void	arc4random_addrandom(unsigned char *, int)
	__attribute__((__bounded__ (__string__,1,2)));
#endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */

__END_DECLS

#endif /* _STDLIB_H_ */