105 lines
3.8 KiB
C
105 lines
3.8 KiB
C
/*----------------------------------------------------------------------------*/
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/**
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@file ieeefp-compat.h
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@author N. Devillard
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@date Feb 2002
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@version $Revision: 2.11 $
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@brief This module implements the isnan() and isinf() macros.
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The isnan() and isinf() macros are unfortunately not yet part of
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the standard C math library everywhere. They can usually be found
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in different places, if they are offered at all, and require the
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application to link against the math library. To avoid portability
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problems and linking against -lm, this module implements a fast
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and portable way of finding out whether a floating-point value
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(float or double) is a NaN or an Inf.
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Instead of calling isnan() and isinf(), the programmer including
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this file should call qfits_isnan() and qfits_isinf().
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*/
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/*----------------------------------------------------------------------------*/
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/*
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$Id: ieeefp-compat.h,v 2.11 2003/11/24 09:44:53 yjung Exp $
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$Author: yjung $
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$Date: 2003/11/24 09:44:53 $
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$Revision: 2.11 $
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*/
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#ifndef IEEEFP_COMPAT_H
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#define IEEEFP_COMPAT_H
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/*-----------------------------------------------------------------------------
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Macros
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-----------------------------------------------------------------------------*/
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/* <dox> */
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/*----------------------------------------------------------------------------*/
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/**
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@brief Test a floating-point variable for NaN value.
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@param n Number to test (float or double)
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@return 1 if n is NaN, 0 else.
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This macro is needed to support both float and double variables
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as input parameter. It checks on the size of the input variable
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to branch to the float or double version.
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Portability is an issue for this function which is present on
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most Unixes but not all, under various libraries (C lib on BSD,
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Math lib on Linux, sunmath on Solaris, ...). Integrating the
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code for this function makes qfits independent from any math
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library.
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*/
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/*----------------------------------------------------------------------------*/
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#define qfits_isnan(n) ((sizeof(n)==sizeof(float)) ? _qfits_isnanf(n) : \
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(sizeof(n)==sizeof(double)) ? _qfits_isnand(n) : -1)
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/*----------------------------------------------------------------------------*/
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/**
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@brief Test a floating-point variable for Inf value.
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@param n Number to test (float or double)
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@return 1 if n is Inf or -Inf, 0 else.
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This macro is needed to support both float and double variables
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as input parameter. It checks on the size of the input variable
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to branch to the float or double version.
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Portability is an issue for this function which is missing on most
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Unixes. Most of the time, another function called finite() is
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offered to perform the opposite task, but it is not consistent
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among platforms and found in various libraries. Integrating the
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code for this function makes qfits independent from any math
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library.
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*/
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/*----------------------------------------------------------------------------*/
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#define qfits_isinf(n) ((sizeof(n)==sizeof(float)) ? _qfits_isinff(n) : \
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(sizeof(n)==sizeof(double)) ? _qfits_isinfd(n) : -1)
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/*-----------------------------------------------------------------------------
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Function prototypes
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-----------------------------------------------------------------------------*/
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/**
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* Test a float variable for NaN value.
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* Do not call directly, call qfits_isnan().
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*/
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int _qfits_isnanf (float f);
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/**
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* Test a float variable for Inf value.
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* Do not call directly, call qfits_isinf().
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*/
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int _qfits_isinff (float f);
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/**
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* Test a double variable for NaN value.
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* Do not call directly, call qfits_isnan().
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*/
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int _qfits_isnand (double d);
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/**
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* Test a double variable for Inf value.
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* Do not call directly, call qfits_isinf().
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*/
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int _qfits_isinfd (double d);
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/* </dox> */
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#endif
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/* vim: set ts=4 et sw=4 tw=75 */
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