1 /* Declarations for math functions.
2 Copyright (C) 1991, 92, 93, 95, 96 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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 Free Software Foundation, Inc., 675 Mass Ave,
18 Cambridge, MA 02139, USA. */
21 * ANSI Standard: 4.5 MATHEMATICS <math.h>
34 /* Get machine-dependent HUGE_VAL value (returned on overflow).
35 On all IEEE754 machines, this is +Infinity. */
38 /* Get machine-dependent NAN value (returned for some domain errors). */
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'. */
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
57 #define _Mdouble_ double
58 #define __MATH_PRECNAME(name,r) name##r
59 #include <mathcalls.h>
61 #undef __MATH_PRECNAME
65 /* Include the file of declarations again, this type using `float'
66 instead of `double' and appending f to each function name. */
68 #define _Mdouble_ float
69 #define __MATH_PRECNAME(name,r) name##f##r
70 #include <mathcalls.h>
72 #undef __MATH_PRECNAME
74 /* Include the file of declarations again, this type using `long double'
75 instead of `double' and appending l to each function name. */
77 #define _Mdouble_ long double
78 #define __MATH_PRECNAME(name,r) name##l##r
79 #include <mathcalls.h>
81 #undef __MATH_PRECNAME
83 #endif /* Use misc. */
87 /* Support for various different standard error handling behaviors. */
89 typedef enum { _IEEE_ = -1, _SVID_, _XOPEN_, _POSIX_ } _LIB_VERSION_TYPE;
91 /* This variable can be changed at run-time to any of the values above to
92 affect floating point error handling behavior (it may also be necessary
93 to change the hardware FPU exception settings). */
94 extern _LIB_VERSION_TYPE _LIB_VERSION;
99 /* In SVID error handling, `matherr' is called with this description
100 of the exceptional condition. */
110 extern int matherr __P ((struct exception *));
112 #define X_TLOSS 1.41484755040568800000e+16
114 /* Types of exceptions in the `type' field. */
122 /* SVID mode specifies returning this large value instead of infinity. */
124 #include <float.h> /* Defines FLT_MAX. */
131 /* Some useful constants. */
132 #define M_E _Mldbl(2.7182818284590452354) /* e */
133 #define M_LOG2E _Mldbl(1.4426950408889634074) /* log 2e */
134 #define M_LOG10E _Mldbl(0.43429448190325182765) /* log 10e */
135 #define M_LN2 _Mldbl(0.69314718055994530942) /* log e2 */
136 #define M_LN10 _Mldbl(2.30258509299404568402) /* log e10 */
137 #define M_PI _Mldbl(3.14159265358979323846) /* pi */
138 #define M_PI_2 _Mldbl(1.57079632679489661923) /* pi/2 */
139 #define M_PI_4 _Mldbl(0.78539816339744830962) /* pi/4 */
140 #define M_1_PI _Mldbl(0.31830988618379067154) /* 1/pi */
141 #define M_2_PI _Mldbl(0.63661977236758134308) /* 2/pi */
142 #define M_2_SQRTPI _Mldbl(1.12837916709551257390) /* 2/sqrt(pi) */
143 #define M_SQRT2 _Mldbl(1.41421356237309504880) /* sqrt(2) */
144 #define M_SQRT1_2 _Mldbl(0.70710678118654752440) /* 1/sqrt(2) */
146 /* Our constants might specify more precision than `double' can represent.
147 Use `long double' constants in standard and GNU C, where they are
148 supported and the cast to `double'. */
149 #if __STDC__ - 0 || __GNUC__ - 0
150 #define _Mldbl(x) x##L
151 #else /* Traditional C. */
153 #endif /* Standard or GNU C. */
158 /* Get machine-dependent inline versions (if there are any). */
159 #if defined (__NO_MATH_INLINES) || defined (__OPTIMIZE__)