math/math.h

   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.
   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 not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 /*
  21  *      ISO C 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 /* Get machine-dependent HUGE_VAL value (returned on overflow).
  32    On all IEEE754 machines, this is +Infinity.  */
  33 #include <huge_val.h>
  34
  35 /* Get machine-dependent NAN value (returned for some domain errors).  */
  36 #ifdef   __USE_GNU
  37 #include <nan.h>
  38 #endif
  39
  40
  41 /* The file <mathcalls.h> contains the prototypes for all the actual
  42    math functions.  These macros are used for those prototypes, so
  43    we can easily declare each function as both `name' and `__name',
  44    and can declare the float versions `namef' and `__namef'.  */
  45
  46 #define __MATHCALL(function,suffix, args)       \
  47   __MATHDECL (_Mdouble_, function,suffix, args)
  48 #define __MATHDECL(type, function,suffix, args) \
  49   __MATHDECL_1(type, function,suffix, args); \
  50   __MATHDECL_1(type, __##function,suffix, args)
  51 #define __MATHDECL_1(type, function,suffix, args) \
  52   extern type __MATH_PRECNAME(function,suffix) args
  53
  54 #define _Mdouble_               double
  55 #define __MATH_PRECNAME(name,r) name##r
  56 #include <mathcalls.h>
  57 #undef  _Mdouble_
  58 #undef  __MATH_PRECNAME
  59
  60 #ifdef __USE_MISC
  61
  62
  63 /* Include the file of declarations again, this time using `float'
  64    instead of `double' and appending f to each function name.  */
  65
  66 #ifndef _Mfloat_
  67 #define _Mfloat_                float
  68 #endif
  69 #define _Mdouble_               _Mfloat_
  70 #define __MATH_PRECNAME(name,r) name##f##r
  71 #include <mathcalls.h>
  72 #undef  _Mdouble_
  73 #undef  __MATH_PRECNAME
  74
  75 /* Include the file of declarations again, this time using `long double'
  76    instead of `double' and appending l to each function name.  */
  77
  78 #ifndef _Mlong_double_
  79 #define _Mlong_double_          long double
  80 #endif
  81 #define _Mdouble_               _Mlong_double_
  82 #define __MATH_PRECNAME(name,r) name##l##r
  83 #include <mathcalls.h>
  84 #undef  _Mdouble_
  85 #undef  __MATH_PRECNAME
  86
  87 #endif  /* Use misc.  */
  88
  89
  90 #ifdef  __USE_MISC
  91 /* Support for various different standard error handling behaviors.  */
  92
  93 typedef enum { _IEEE_ = -1, _SVID_, _XOPEN_, _POSIX_ } _LIB_VERSION_TYPE;
  94
  95 /* This variable can be changed at run-time to any of the values above to
  96    affect floating point error handling behavior (it may also be necessary
  97    to change the hardware FPU exception settings).  */
  98 extern _LIB_VERSION_TYPE _LIB_VERSION;
  99 #endif
 100
 101
 102 #ifdef __USE_SVID
 103 /* In SVID error handling, `matherr' is called with this description
 104    of the exceptional condition.  */
 105 struct exception
 106   {
 107     int type;
 108     char *name;
 109     double arg1;
 110     double arg2;
 111     double retval;
 112   };
 113
 114 extern int __matherr __P ((struct exception *));
 115 extern int matherr __P ((struct exception *));
 116
 117 #define X_TLOSS         1.41484755040568800000e+16
 118
 119 /* Types of exceptions in the `type' field.  */
 120 #define DOMAIN          1
 121 #define SING            2
 122 #define OVERFLOW        3
 123 #define UNDERFLOW       4
 124 #define TLOSS           5
 125 #define PLOSS           6
 126
 127 /* SVID mode specifies returning this large value instead of infinity.  */
 128 #define HUGE            FLT_MAX
 129 #include <float.h>              /* Defines FLT_MAX.  */
 130
 131 #endif
 132
 133
 134 #ifdef __USE_BSD
 135
 136 /* Some useful constants.  */
 137 #define M_E             _Mldbl(2.7182818284590452354)   /* e */
 138 #define M_LOG2E         _Mldbl(1.4426950408889634074)   /* log 2e */
 139 #define M_LOG10E        _Mldbl(0.43429448190325182765)  /* log 10e */
 140 #define M_LN2           _Mldbl(0.69314718055994530942)  /* log e2 */
 141 #define M_LN10          _Mldbl(2.30258509299404568402)  /* log e10 */
 142 #define M_PI            _Mldbl(3.14159265358979323846)  /* pi */
 143 #define M_PI_2          _Mldbl(1.57079632679489661923)  /* pi/2 */
 144 #define M_PI_4          _Mldbl(0.78539816339744830962)  /* pi/4 */
 145 #define M_1_PI          _Mldbl(0.31830988618379067154)  /* 1/pi */
 146 #define M_2_PI          _Mldbl(0.63661977236758134308)  /* 2/pi */
 147 #define M_2_SQRTPI      _Mldbl(1.12837916709551257390)  /* 2/sqrt(pi) */
 148 #define M_SQRT2         _Mldbl(1.41421356237309504880)  /* sqrt(2) */
 149 #define M_SQRT1_2       _Mldbl(0.70710678118654752440)  /* 1/sqrt(2) */
 150
 151 /* Our constants might specify more precision than `double' can represent.
 152    Use `long double' constants in standard and GNU C, where they are
 153    supported and the cast to `double'.  */
 154 #if __STDC__ - 0 || __GNUC__ - 0
 155 #define _Mldbl(x) x##L
 156 #else   /* Traditional C.  */
 157 #define _Mldbl(x) x
 158 #endif  /* Standard or GNU C.  */
 159
 160 #endif
 161
 162
 163 /* Get machine-dependent inline versions (if there are any).  */
 164 #if defined (__NO_MATH_INLINES) || defined (__OPTIMIZE__)
 165 #include <__math.h>
 166 #endif
 167
 168
 169 __END_DECLS
 170
 171
 172 #endif /* math.h  */