/* Copyright (C) 1991, 1992 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
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

/*
 *	ANSI Standard: 4.10 GENERAL UTILITIES	<stdlib.h>
 */

#ifndef	_STDLIB_H

#define	_STDLIB_H	1
#include <features.h>

/* Get size_t, wchar_t and NULL from <stddef.h>.  */
#define	__need_size_t
#define	__need_wchar_t
#define	__need_NULL
#include <stddef.h>

#define	__need_Emath
#include <errno.h>

/* Get HUGE_VAL (returned by strtod on overflow) from <float.h>.  */
#define	__need_HUGE_VAL
#include <float.h>


/* Returned by `div'.  */
typedef struct
  {
    int quot;	/* Quotient.  */
    int rem;	/* Remainder.  */
  } div_t;

/* Returned by `ldiv'.  */
typedef struct
  {
    long int quot;	/* Quotient.  */
    long int rem;	/* Remainder.  */
  } ldiv_t;


/* The largest number rand will return (same as INT_MAX).  */
#define	RAND_MAX	2147483647


/* We define these the same for all machines.
   Changes from this to the outside world should be done in `_exit'.  */
#define	EXIT_FAILURE	1	/* Failing exit status.  */
#define	EXIT_SUCCESS	0	/* Successful exit status.  */


/* Maximum length of a multibyte character in the current locale.
   This is just one until the fancy locale support is finished.  */
#define	MB_CUR_MAX	1


/* Convert a string to a floating-point number.  */
extern double EXFUN(atof, (CONST char *__nptr));
/* Convert a string to an integer.  */
extern int EXFUN(atoi, (CONST char *__nptr));
/* Convert a string to a long integer.  */
extern long int EXFUN(atol, (CONST char *__nptr));

/* Convert a string to a floating-point number.  */
extern double EXFUN(strtod, (CONST char *__nptr, char **__endptr));
/* Convert a string to a long integer.  */
extern long int EXFUN(strtol, (CONST char *__nptr, char **__endptr,
			       int __base));
/* Convert a string to an unsigned long integer.  */
extern unsigned long int EXFUN(strtoul, (CONST char *__nptr,
					 char **__endptr, int __base));

#ifdef	__OPTIMIZE__
#define	atof(nptr)	strtod((nptr), (char **) NULL)
#define	atoi(nptr)	((int) atol(nptr))
#define	atol(nptr)	strtol((nptr), (char **) NULL, 10)
#endif	/* Optimizing.  */


/* Return a random integer between 0 and RAND_MAX inclusive.  */
extern int EXFUN(rand, (NOARGS));
/* Seed the random number generator with the given number.  */
extern void EXFUN(srand, (unsigned int __seed));

/* These are the functions that actually do things.  The `random', `srandom',
   `initstate' and `setstate' functions are those from BSD Unices.
   The `rand' and `srand' functions are required by the ANSI standard.
   We provide both interfaces to the same random number generator.  */
/* Return a random long integer between 0 and RAND_MAX inclusive.  */
extern long int EXFUN(__random, (NOARGS));
/* Seed the random number generator with the given number.  */
extern void EXFUN(__srandom, (unsigned int __seed));

/* Initialize the random number generator to use state buffer STATEBUF,
   of length STATELEN, and seed it with SEED.  Optimal lengths are 8, 16,
   32, 64, 128 and 256, the bigger the better; values less than 8 will
   cause an error and values greater than 256 will be rounded down.  */
extern PTR EXFUN(__initstate, (unsigned int __seed, PTR __statebuf,
			       size_t __statelen));
/* Switch the random number generator to state buffer STATEBUF,
   which should have been previously initialized by `initstate'.  */
extern PTR EXFUN(__setstate, (PTR __statebuf));

#ifdef	__USE_BSD
extern long int EXFUN(random, (NOARGS));
extern void EXFUN(srandom, (unsigned int __seed));
extern PTR EXFUN(initstate, (unsigned int __seed, PTR __statebuf,
			     size_t __statelen));
extern PTR EXFUN(setstate, (PTR __statebuf));

#ifdef	__OPTIMIZE__
#define	random()		__random()
#define	srandom(seed)		__srandom(seed)
#define	initstate(s, b, n)	__initstate((s), (b), (n))
#define	setstate(state)		__setstate(state)
#endif	/* Optimizing.  */
#endif	/* Use BSD.  */

#ifdef	__OPTIMIZE__
#define	rand()		((int) __random())
#define	srand(seed)	__srandom(seed)
#endif	/* Optimizing.  */


/* Allocate SIZE bytes of memory.  */
extern PTR EXFUN(malloc, (size_t __size));
/* Re-allocate the previously allocated block
   in PTR, making the new block SIZE bytes long.  */
extern PTR EXFUN(realloc, (PTR __ptr, size_t __size));
/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
extern PTR EXFUN(calloc, (size_t __nmemb, size_t __size));
/* Free a block allocated by `malloc', `realloc' or `calloc'.  */
extern void EXFUN(free, (PTR __ptr));	

#ifdef	__USE_MISC
/* Free a block.  An alias for `free'.	(Sun Unices).  */
extern void EXFUN(cfree, (PTR __ptr));

#ifdef	__OPTIMIZE__
#define	cfree(ptr)	free(ptr)
#endif	/* Optimizing.  */
#endif	/* Use misc.  */

#if defined(__USE_GNU) || defined(__USE_BSD) || defined(__USE_MISC)
#include <alloca.h>
#endif	/* Use GNU, BSD, or misc.  */

#ifdef	__USE_BSD
/* Allocate SIZE bytes on a page boundary.  The storage cannot be freed.  */
extern PTR EXFUN(valloc, (size_t __size));
#endif


#ifndef	__NORETURN
#ifdef	__GNUC__
/* The `volatile' keyword tells GCC that a function never returns.  */
#define	__NORETURN	__volatile
#else	/* Not GCC.  */
#define	__NORETURN
#endif	/* GCC.  */
#endif	/* __NORETURN not defined.  */

/* Abort execution and generate a core-dump.  */
extern __NORETURN void EXFUN(abort, (NOARGS));


/* Register a function to be called when `exit' is called.  */
extern int EXFUN(atexit, (void (*__func)(NOARGS)));

#ifdef	__USE_MISC
/* Register a function to be called with the status
   given to `exit' and the given argument.  */
extern int EXFUN(on_exit, (void (*__func)(int __status, PTR __arg),
			   PTR __arg));
#endif

/* Call all functions registered with `atexit' and `on_exit',
   in the reverse of the order in which they were registered
   perform stdio cleanup, and terminate program execution with STATUS.  */
extern __NORETURN void EXFUN(exit, (int __status));


/* Return the value of envariable NAME, or NULL if it doesn't exist.  */
extern char *EXFUN(getenv, (CONST char *__name));

#ifdef	__USE_SVID
/* The SVID says this is in <stdio.h>, but this seems a better place.	*/
/* Put STRING, which is of the form "NAME=VALUE", in the environment.
   If there is no `=', remove NAME from the environment.  */
extern int EXFUN(putenv, (CONST char *__string));
#endif

/* Execute the given line as a shell command.  */
extern int EXFUN(system, (CONST char *__command));


/* Shorthand for type of comparison functions.  */
typedef int (*__compar_fn_t) (CONST PTR, CONST PTR);

#ifdef	__GNUC__
#define	comparison_fn_t	__compar_fn_t
#endif

/* Do a binary search for KEY in BASE, which consists of NMEMB elements
   of SIZE bytes each, using COMPAR to perform the comparisons.  */
extern PTR EXFUN(bsearch, (CONST PTR __key, CONST PTR __base,
			   size_t __nmemb, size_t __size,
			   __compar_fn_t __compar));

/* Sort NMEMB elements of BASE, of SIZE bytes each,
   using COMPAR to perform the comparisons.  */
extern void EXFUN(qsort, (PTR __base, size_t __nmemb, size_t __size,
			  __compar_fn_t __compar));


#ifndef	__CONSTVALUE
#ifdef	__GNUC__
/* The `const' keyword tells GCC that a function's return value is
   based solely on its arguments, and there are no side-effects.  */
#define	__CONSTVALUE	__const
#else
#define	__CONSTVALUE
#endif	/* GCC.  */
#endif	/* __CONSTVALUE not defined.  */

/* Return the absolute value of X.  */
extern __CONSTVALUE int EXFUN(abs, (int __x));
extern __CONSTVALUE long int EXFUN(labs, (long int __x));

#if	defined(__GNUC__) && defined(__OPTIMIZE__)
#define	abs(x)	__builtin_abs(x)
#define	labs(x)	__builtin_labs(x)
#endif	/* GCC and optimizing.  */


/* Return the `div_t' or `ldiv_t' representation
   of the value of NUMER over DENOM. */
/* GCC may have built-ins for these someday.  */
extern __CONSTVALUE div_t EXFUN(div, (int __numer, int __denom));
extern __CONSTVALUE ldiv_t EXFUN(ldiv, (long int __numer, long int __denom));


/* Return the length of the multibyte character
   in S, which is no longer than N.  */
extern int EXFUN(mblen, (CONST char *__s, size_t __n));
/* Return the length of the given multibyte character,
   putting its `wchar_t' representation in *PWC.  */
extern int EXFUN(mbtowc, (wchar_t *__pwc, CONST char *__s, size_t __n));
/* Put the multibyte character represented
   by WCHAR in S, returning its length.  */
extern int EXFUN(wctomb, (char *__s, wchar_t __wchar));

#ifdef	__OPTIMIZE__
#define	mblen(s, n)	mbtowc((wchar_t *) NULL, (s), (n))
#endif	/* Optimizing.  */


/* Convert a multibyte string to a wide char string.  */
extern size_t EXFUN(mbstowcs, (wchar_t *__pwcs, CONST char *__s, size_t __n));
/* Convert a wide char string to multibyte string.  */
extern size_t EXFUN(wcstombs, (char *__s, CONST wchar_t *__pwcs, size_t __n));


#endif	/* stdlib.h  */