233 lines
6.9 KiB
C
233 lines
6.9 KiB
C
/* Prototype declarations for math functions; helper file for <math.h>.
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Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/* NOTE: Because of the special way this file is used by <math.h>, this
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file must NOT be protected from multiple inclusion as header files
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usually are.
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This file provides prototype declarations for the math functions.
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Most functions are declared using the macro:
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__MATHCALL (NAME,[_r], (ARGS...));
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This means there is a function `NAME' returning `double' and a function
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`NAMEf' returning `float'. Each place `_Mdouble_' appears in the
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prototype, that is actually `double' in the prototype for `NAME' and
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`float' in the prototype for `NAMEf'. Reentrant variant functions are
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called `NAME_r' and `NAMEf_r'.
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Functions returning other types like `int' are declared using the macro:
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__MATHDECL (TYPE, NAME,[_r], (ARGS...));
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This is just like __MATHCALL but for a function returning `TYPE'
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instead of `_Mdouble_'. In all of these cases, there is still
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both a `NAME' and a `NAMEf' that takes `float' arguments. */
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#ifndef _MATH_H
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#error "Never include mathcalls.h directly; include <math.h> instead."
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#endif
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/* Trigonometric functions. */
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/* Arc cosine of X. */
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__MATHCALL (acos,, (_Mdouble_ __x));
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/* Arc sine of X. */
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__MATHCALL (asin,, (_Mdouble_ __x));
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/* Arc tangent of X. */
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__MATHCALL (atan,, (_Mdouble_ __x));
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/* Arc tangent of Y/X. */
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__MATHCALL (atan2,, (_Mdouble_ __y, _Mdouble_ __x));
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/* Cosine of X. */
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__MATHCALL (cos,, (_Mdouble_ __x));
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/* Sine of X. */
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__MATHCALL (sin,, (_Mdouble_ __x));
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/* Tangent of X. */
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__MATHCALL (tan,, (_Mdouble_ __x));
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/* Hyperbolic functions. */
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/* Hyperbolic cosine of X. */
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__MATHCALL (cosh,, (_Mdouble_ __x));
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/* Hyperbolic sine of X. */
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__MATHCALL (sinh,, (_Mdouble_ __x));
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/* Hyperbolic tangent of X. */
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__MATHCALL (tanh,, (_Mdouble_ __x));
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#ifdef __USE_MISC
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/* Hyperbolic arc cosine of X. */
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__MATHCALL (acosh,, (_Mdouble_ __x));
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/* Hyperbolic arc sine of X. */
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__MATHCALL (asinh,, (_Mdouble_ __x));
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/* Hyperbolic arc tangent of X. */
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__MATHCALL (atanh,, (_Mdouble_ __x));
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#endif
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/* Exponential and logarithmic functions. */
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/* Exponentional function of X. */
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__MATHCALL (exp,, (_Mdouble_ __x));
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/* Break VALUE into a normalized fraction and an integral power of 2. */
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__MATHCALL (frexp,, (_Mdouble_ __value, int *__exp));
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/* X times (two to the EXP power). */
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__MATHCALL (ldexp,, (_Mdouble_ __x, int __exp));
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/* Natural logarithm of X. */
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__MATHCALL (log,, (_Mdouble_ __x));
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/* Base-ten logarithm of X. */
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__MATHCALL (log10,, (_Mdouble_ __x));
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#ifdef __USE_MISC
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/* Return exp(X) - 1. */
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__MATHCALL (expm1,, (_Mdouble_ __x));
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/* Return log(1 + X). */
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__MATHCALL (log1p,, (_Mdouble_ __x));
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#endif
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/* Break VALUE into integral and fractional parts. */
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__MATHCALL (modf,, (_Mdouble_ __value, _Mdouble_ *__iptr));
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/* Power functions. */
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/* Return X to the Y power. */
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__MATHCALL (pow,, (_Mdouble_ __x, _Mdouble_ __y));
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/* Return the square root of X. */
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__MATHCALL (sqrt,, (_Mdouble_ __x));
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#ifdef __USE_MISC
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/* Return the cube root of X. */
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__MATHCALL (cbrt,, (_Mdouble_ __x));
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#endif
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/* Nearest integer, absolute value, and remainder functions. */
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/* Smallest integral value not less than X. */
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__MATHCALL (ceil,, (_Mdouble_ __x));
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/* Absolute value of X. */
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__MATHCALL (fabs,, (_Mdouble_ __x));
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/* Largest integer not greater than X. */
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__MATHCALL (floor,, (_Mdouble_ __x));
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/* Floating-point modulo remainder of X/Y. */
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__MATHCALL (fmod,, (_Mdouble_ __x, _Mdouble_ __y));
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#ifdef __USE_MISC
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/* Return 0 if VALUE is finite or NaN, +1 if it
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is +Infinity, -1 if it is -Infinity. */
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__MATHDECL (int, isinf,, (_Mdouble_ __value));
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/* Return nonzero if VALUE is not a number. */
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__MATHDECL (int, isnan,, (_Mdouble_ __value));
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/* Return nonzero if VALUE is finite and not NaN. */
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__MATHDECL (int, finite,, (_Mdouble_ __value));
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/* Deal with an infinite or NaN result.
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If ERROR is ERANGE, result is +Inf;
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if ERROR is - ERANGE, result is -Inf;
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otherwise result is NaN.
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This will set `errno' to either ERANGE or EDOM,
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and may return an infinity or NaN, or may do something else. */
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__MATHCALL (infnan,, (int __error));
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/* Return X with its signed changed to Y's. */
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__MATHCALL (copysign,, (_Mdouble_ __x, _Mdouble_ __y));
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/* Return X times (2 to the Nth power). */
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__MATHCALL (scalb,, (_Mdouble_ __x, _Mdouble_ __n));
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/* Return X times (2 to the Nth power). */
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__MATHCALL (scalbn,, (_Mdouble_ __x, int __n));
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/* Return the remainder of X/Y. */
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__MATHCALL (drem,, (_Mdouble_ __x, _Mdouble_ __y));
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/* Return the base 2 signed integral exponent of X. */
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__MATHCALL (logb,, (_Mdouble_ __x));
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/* Return the integer nearest X in the direction of the
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prevailing rounding mode. */
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__MATHCALL (rint,, (_Mdouble_ __x));
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/* Return `sqrt(X*X + Y*Y)'. */
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__MATHCALL (hypot,, (_Mdouble_ __x, _Mdouble_ __y));
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struct __MATH_PRECNAME(__cabs_complex,)
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{
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_Mdouble_ x, y;
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};
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/* Return `sqrt(X*X + Y*Y)'. */
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__MATHCALL (cabs,, (struct __MATH_PRECNAME(__cabs_complex,)));
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/* Return X + epsilon if X < Y, X - epsilon if X > Y. */
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__MATHCALL (nextafter,, (_Mdouble_ __x, _Mdouble_ __y));
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/* Return the remainder of integer divison X / Y with infinite precision. */
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__MATHCALL (remainder,, (_Mdouble_ __x, _Mdouble_ __y));
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/* Return the binary exponent of X, which must be nonzero. */
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__MATHDECL (int, ilogb,, (_Mdouble_ __x));
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/* Return the fractional part of X after dividing out `ilogb (X)'. */
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__MATHCALL (significand,, (_Mdouble_ __x));
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/* Error, gamma, and Bessel functions. */
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__MATHCALL (erf,, (_Mdouble_));
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__MATHCALL (erfc,, (_Mdouble_));
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__MATHCALL (gamma,, (_Mdouble_));
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__MATHCALL (j0,, (_Mdouble_));
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__MATHCALL (j1,, (_Mdouble_));
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__MATHCALL (jn,, (int, _Mdouble_));
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__MATHCALL (lgamma,, (_Mdouble_));
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__MATHCALL (y0,, (_Mdouble_));
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__MATHCALL (y1,, (_Mdouble_));
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__MATHCALL (yn,, (int, _Mdouble_));
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/* This variable is used by `gamma' and `lgamma'. */
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extern int signgam;
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#ifdef __USE_REENTRANT
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/* Reentrant versions of gamma and lgamma. Those functions use the global
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variable `signgam'. The reentrant versions instead take a pointer and
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store the value through it. */
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__MATHCALL (gamma,_r, (_Mdouble_, int *));
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__MATHCALL (lgamma,_r, (_Mdouble_, int *));
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#endif
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#endif /* Use misc. */
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