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glibc  2.9
w_hypot.c
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00001 /* @(#)w_hypot.c 5.1 93/09/24 */
00002 /*
00003  * ====================================================
00004  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
00005  *
00006  * Developed at SunPro, a Sun Microsystems, Inc. business.
00007  * Permission to use, copy, modify, and distribute this
00008  * software is freely granted, provided that this notice
00009  * is preserved.
00010  * ====================================================
00011  */
00012 
00013 #if defined(LIBM_SCCS) && !defined(lint)
00014 static char rcsid[] = "$NetBSD: w_hypot.c,v 1.6 1995/05/10 20:49:07 jtc Exp $";
00015 #endif
00016 
00017 /*
00018  * wrapper hypot(x,y)
00019  */
00020 
00021 #include <math.h>
00022 #include "math_private.h"
00023 
00024 
00025 #ifdef __STDC__
00026        double __hypot(double x, double y)/* wrapper hypot */
00027 #else
00028        double __hypot(x,y)         /* wrapper hypot */
00029        double x,y;
00030 #endif
00031 {
00032 #ifdef _IEEE_LIBM
00033        return __ieee754_hypot(x,y);
00034 #else
00035        double z;
00036        z = __ieee754_hypot(x,y);
00037        if(_LIB_VERSION == _IEEE_) return z;
00038        if((!__finite(z))&&__finite(x)&&__finite(y))
00039            return __kernel_standard(x,y,4); /* hypot overflow */
00040        else
00041            return z;
00042 #endif
00043 }
00044 weak_alias (__hypot, hypot)
00045 #ifdef NO_LONG_DOUBLE
00046 strong_alias (__hypot, __hypotl)
00047 weak_alias (__hypot, hypotl)
00048 #endif