mirror of
https://github.com/adtools/clib2.git
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fa31c468dc
- nan() and nanf() now return quiet NaNs. - Added internal __inf() and __inff() functions. - strtof() now calls nanf() and __inff(), respectively, to produce the special floating point values for nan/inf/infinity. - strtod() now calls nan() and __inf(), respectively, to produce the special floating point values for nan/inf/infinity. - The scanf() family now calls nan() and __inf(), respectively, to produce the special floating point values for nan/inf/infinity. git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14948 87f5fb63-7c3d-0410-a384-fd976d0f7a62
154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/*
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* $Id: math_fpclassify.c,v 1.3 2005-05-14 10:52:31 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _STDIO_HEADERS_H
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#include "stdio_headers.h"
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#endif /* _STDIO_HEADERS_H */
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/****************************************************************************/
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#if defined (FLOATING_POINT_SUPPORT)
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/****************************************************************************/
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/* The following is not part of the ISO 'C' (1994) standard, but it should
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be part of ISO/IEC 9899:1999, also known as "C99". */
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/****************************************************************************/
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int
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__fpclassify_float(float number)
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{
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union ieee_single x;
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int result;
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x.value = number;
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D(("number = 0x%08lx",x.raw[0]));
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if((x.raw[0] & 0x7f800000) == 0x7f800000 && (x.raw[0] & 0x007fffff) != 0)
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{
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SHOWMSG("not a number");
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/* Exponent = 255 and fraction != 0.0 -> not a number */
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result = FP_NAN;
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}
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else if ((x.raw[0] & 0x7fffffff) == 0x7f800000)
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{
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SHOWMSG("infinity");
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/* Exponent = 255 and fraction = 0.0 -> infinity */
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result = FP_INFINITE;
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}
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else if ((x.raw[0] & 0x7fffffff) == 0)
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{
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SHOWMSG("zero");
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/* Both exponent and fraction are zero -> zero */
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result = FP_ZERO;
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}
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else if ((x.raw[0] & 0x7f800000) == 0)
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{
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SHOWMSG("subnormal");
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/* Exponent = 0 -> subnormal (IEEE 754) */
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result = FP_SUBNORMAL;
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}
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else
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{
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SHOWMSG("normal");
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result = FP_NORMAL;
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}
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SHOWVALUE(result);
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return(result);
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}
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/****************************************************************************/
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int
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__fpclassify_double(double number)
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{
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union ieee_double x;
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int result;
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x.value = number;
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D(("number = 0x%08lx%08lx",x.raw[0],x.raw[1]));
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if(((x.raw[0] & 0x7ff00000) == 0x7ff00000) && ((x.raw[0] & 0x000fffff) != 0 || (x.raw[1] != 0)))
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{
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SHOWMSG("not a number");
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/* Exponent = 2047 and fraction != 0.0 -> not a number */
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result = FP_NAN;
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}
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else if (((x.raw[0] & 0x7fffffff) == 0x7ff00000) && (x.raw[1] == 0))
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{
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SHOWMSG("infinity");
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/* Exponent = 2047 and fraction = 0.0 -> infinity */
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result = FP_INFINITE;
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}
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else if ((((x.raw[0] & 0x7fffffff) == 0) && (x.raw[1] == 0)))
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{
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SHOWMSG("zero");
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/* Both exponent and fraction are zero -> zero */
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result = FP_ZERO;
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}
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else if ((x.raw[0] & 0x7fff0000) == 0)
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{
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SHOWMSG("subnormal");
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/* Exponent = 0 -> subnormal (IEEE 754) */
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result = FP_SUBNORMAL;
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}
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else
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{
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SHOWMSG("normal");
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result = FP_NORMAL;
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}
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SHOWVALUE(result);
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return(result);
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}
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/****************************************************************************/
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#endif /* FLOATING_POINT_SUPPORT */
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