1 /* @(#)w_sqrt.c 5.1 93/09/24 */ 2 /* 3 * ==================================================== 4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 5 * 6 * Developed at SunPro, a Sun Microsystems, Inc. business. 7 * Permission to use, copy, modify, and distribute this 8 * software is freely granted, provided that this notice 9 * is preserved. 10 * ==================================================== 11 */ 12 13 #include <sys/cdefs.h> 14 #if defined(LIBM_SCCS) && !defined(lint) 15 __RCSID("$NetBSD: w_sqrt.c,v 1.7 1997/10/09 11:36:12 lukem Exp $"); 16 #endif 17 18 /* 19 * wrapper sqrt(x) 20 */ 21 22 #include "math.h" 23 #include "math_private.h" 24 25 #ifdef __STDC__ 26 double sqrt(double x) /* wrapper sqrt */ 27 #else 28 double sqrt(x) /* wrapper sqrt */ 29 double x; 30 #endif 31 { 32 #ifdef _IEEE_LIBM 33 return __ieee754_sqrt(x); 34 #else 35 double z; 36 z = __ieee754_sqrt(x); 37 if(_LIB_VERSION == _IEEE_ || isnan(x)) return z; 38 if(x<0.0) { 39 return __kernel_standard(x,x,26); /* sqrt(negative) */ 40 } else 41 return z; 42 #endif 43 } 44