summary refs log tree commit diff
path: root/math/math.h
blob: 2693fcc9d00d94e8b690d7ea938478c421a7d9b5 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
/* 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  */