[glibc.git] / math / math.h

/* Declarations for math functions.
Copyright (C) 1991, 92, 93, 95, 96 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, 1992 Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

/*
 *	ANSI Standard: 4.5 MATHEMATICS	<math.h>
 */

#ifndef	_MATH_H

#define	_MATH_H	1
#include <features.h>

__BEGIN_DECLS

#define	__need_Emath
#include <errno.h>

/* Get machine-dependent HUGE_VAL value (returned on overflow).
   On all IEEE754 machines, this is +Infinity.  */
#include <huge_val.h>

/* Get machine-dependent NAN value (returned for some domain errors).  */
#ifdef	 __USE_GNU
#include <nan.h>
#endif


/* The file <mathcalls.h> contains the prototypes for all the actual
   math functions.  These macros are used for those prototypes, so
   we can easily declare each function as both `name' and `__name',
   and can declare the float versions `namef' and `__namef'.  */

#define __MATHCALL(function,suffix, args)	\
  __MATHDECL (_Mdouble_, function,suffix, args)
#define __MATHDECL(type, function,suffix, args) \
  __MATHDECL_1(type, function,suffix, args); \
  __MATHDECL_1(type, __##function,suffix, args)
#define __MATHDECL_1(type, function,suffix, args) \
  extern type __MATH_PRECNAME(function,suffix) args

#define _Mdouble_ 		double
#define __MATH_PRECNAME(name,r)	name##r
#include <mathcalls.h>
#undef	_Mdouble_
#undef	__MATH_PRECNAME

#ifdef __USE_MISC
/* Include the file of declarations again, this type using `float'
   instead of `double' and appending f to each function name.  */

#define _Mdouble_ 		float
#define __MATH_PRECNAME(name,r)	name##f##r
#include <mathcalls.h>
#undef	_Mdouble_
#undef	__MATH_PRECNAME
#endif


#ifdef	__USE_MISC
/* Support for various different standard error handling behaviors.  */

typedef enum { _IEEE_ = -1, _SVID_, _XOPEN_, _POSIX_ } _LIB_VERSION_TYPE;

/* This variable can be changed at run-time to any of the values above to
   affect floating point error handling behavior (it may also be necessary
   to change the hardware FPU exception settings).  */
extern _LIB_VERSION_TYPE _LIB_VERSION;
#endif


#ifdef __USE_SVID
/* In SVID error handling, `matherr' is called with this description
   of the exceptional condition.  */
struct exception
  {
    int type;
    char *name;
    double arg1;
    double arg2;
    double retval;
  };

extern int matherr __P ((struct exception *));

#define X_TLOSS		1.41484755040568800000e+16

/* Types of exceptions in the `type' field.  */
#define	DOMAIN		1
#define	SING		2
#define	OVERFLOW	3
#define	UNDERFLOW	4
#define	TLOSS		5
#define	PLOSS		6

/* SVID mode specifies returning this large value instead of infinity.  */
#define HUGE		FLT_MAX
#include <float.h>		/* Defines FLT_MAX.  */

#endif


/* Get machine-dependent inline versions (if there are any).  */
#include <__math.h>


__END_DECLS


#ifdef __USE_BSD
/* Some useful constants.  */
#define	M_E		2.7182818284590452354	/* e */
#define	M_LOG2E		1.4426950408889634074	/* log 2e */
#define	M_LOG10E	0.43429448190325182765	/* log 10e */
#define	M_LN2		0.69314718055994530942	/* log e2 */
#define	M_LN10		2.30258509299404568402	/* log e10 */
#define	M_PI		3.14159265358979323846	/* pi */
#define	M_PI_2		1.57079632679489661923	/* pi/2 */
#define	M_PI_4		0.78539816339744830962	/* pi/4 */
#define	M_1_PI		0.31830988618379067154	/* 1/pi */
#define	M_2_PI		0.63661977236758134308	/* 2/pi */
#define	M_2_SQRTPI	1.12837916709551257390	/* 2/sqrt(pi) */
#define	M_SQRT2		1.41421356237309504880	/* sqrt(2) */
#define	M_SQRT1_2	0.70710678118654752440	/* 1/sqrt(2) */
#endif


#endif /* math.h  */
Commit	Line	Data
f7eac6eb RM	1	/* Declarations for math functions.
f7eac6eb RM	2	Copyright (C) 1991, 92, 93, 95, 96 Free Software Foundation, Inc.
28f540f4 RM	3	This file is part of the GNU C Library.
	4
	5	The GNU C Library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Library General Public License as
	7	published by the Free Software Foundation; either version 2 of the
	8	License, or (at your option) any later version.
	9
	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Library General Public License for more details.
	14
	15	You should have received a copy of the GNU Library General Public
	16	License along with the GNU C Library; see the file COPYING.LIB. If
	17	not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
	18	Cambridge, MA 02139, USA. */
	19
	20	/*
	21	* ANSI Standard: 4.5 MATHEMATICS <math.h>
	22	*/
	23
	24	#ifndef _MATH_H
	25
	26	#define _MATH_H 1
	27	#include <features.h>
	28
	29	__BEGIN_DECLS
	30
	31	#define __need_Emath
	32	#include <errno.h>
	33
f7eac6eb RM	34	/* Get machine-dependent HUGE_VAL value (returned on overflow).
f7eac6eb RM	35	On all IEEE754 machines, this is +Infinity. */
28f540f4 RM	36	#include <huge_val.h>
	37
	38	/* Get machine-dependent NAN value (returned for some domain errors). */
	39	#ifdef __USE_GNU
	40	#include <nan.h>
	41	#endif
	42
	43
f7eac6eb RM	44	/* The file <mathcalls.h> contains the prototypes for all the actual
	45	math functions. These macros are used for those prototypes, so
	46	we can easily declare each function as both `name' and `__name',
	47	and can declare the float versions `namef' and `__namef'. */
	48
	49	#define __MATHCALL(function,suffix, args) \
	50	__MATHDECL (_Mdouble_, function,suffix, args)
	51	#define __MATHDECL(type, function,suffix, args) \
	52	__MATHDECL_1(type, function,suffix, args); \
	53	__MATHDECL_1(type, __##function,suffix, args)
	54	#define __MATHDECL_1(type, function,suffix, args) \
	55	extern type __MATH_PRECNAME(function,suffix) args
	56
	57	#define _Mdouble_ double
	58	#define __MATH_PRECNAME(name,r) name##r
	59	#include <mathcalls.h>
	60	#undef _Mdouble_
	61	#undef __MATH_PRECNAME
	62
	63	#ifdef __USE_MISC
	64	/* Include the file of declarations again, this type using `float'
	65	instead of `double' and appending f to each function name. */
	66
	67	#define _Mdouble_ float
	68	#define __MATH_PRECNAME(name,r) name##f##r
	69	#include <mathcalls.h>
	70	#undef _Mdouble_
	71	#undef __MATH_PRECNAME
28f540f4 RM	72	#endif
28f540f4 RM	73
28f540f4 RM	74
28f540f4 RM	75	#ifdef __USE_MISC
f7eac6eb	76	/* Support for various different standard error handling behaviors. */
28f540f4	77
f7eac6eb	78	typedef enum { _IEEE_ = -1, _SVID_, _XOPEN_, _POSIX_ } _LIB_VERSION_TYPE;
28f540f4	79
f7eac6eb RM	80	/* This variable can be changed at run-time to any of the values above to
	81	affect floating point error handling behavior (it may also be necessary
	82	to change the hardware FPU exception settings). */
	83	extern _LIB_VERSION_TYPE _LIB_VERSION;
28f540f4 RM	84	#endif
	85
	86
f7eac6eb RM	87	#ifdef __USE_SVID
	88	/* In SVID error handling, `matherr' is called with this description
	89	of the exceptional condition. */
	90	struct exception
	91	{
	92	int type;
	93	char *name;
	94	double arg1;
	95	double arg2;
	96	double retval;
	97	};
28f540f4	98
f7eac6eb	99	extern int matherr __P ((struct exception *));
28f540f4	100
f7eac6eb	101	#define X_TLOSS 1.41484755040568800000e+16
28f540f4	102
f7eac6eb RM	103	/* Types of exceptions in the `type' field. */
	104	#define DOMAIN 1
	105	#define SING 2
	106	#define OVERFLOW 3
	107	#define UNDERFLOW 4
	108	#define TLOSS 5
	109	#define PLOSS 6
28f540f4	110
f7eac6eb RM	111	/* SVID mode specifies returning this large value instead of infinity. */
	112	#define HUGE FLT_MAX
	113	#include <float.h> /* Defines FLT_MAX. */
28f540f4	114
28f540f4 RM	115	#endif
28f540f4 RM	116
28f540f4 RM	117
	118	/* Get machine-dependent inline versions (if there are any). */
	119	#include <__math.h>
	120
f7eac6eb	121
28f540f4 RM	122	__END_DECLS
	123
	124
	125	#ifdef __USE_BSD
	126	/* Some useful constants. */
	127	#define M_E 2.7182818284590452354 /* e */
	128	#define M_LOG2E 1.4426950408889634074 /* log 2e */
	129	#define M_LOG10E 0.43429448190325182765 /* log 10e */
	130	#define M_LN2 0.69314718055994530942 /* log e2 */
	131	#define M_LN10 2.30258509299404568402 /* log e10 */
	132	#define M_PI 3.14159265358979323846 /* pi */
	133	#define M_PI_2 1.57079632679489661923 /* pi/2 */
	134	#define M_PI_4 0.78539816339744830962 /* pi/4 */
	135	#define M_1_PI 0.31830988618379067154 /* 1/pi */
	136	#define M_2_PI 0.63661977236758134308 /* 2/pi */
	137	#define M_2_SQRTPI 1.12837916709551257390 /* 2/sqrt(pi) */
	138	#define M_SQRT2 1.41421356237309504880 /* sqrt(2) */
	139	#define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */
	140	#endif
	141
	142
	143	#endif /* math.h */