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 #ifndef lint 14 static char rcsid[] = "$Id: w_sqrt.c,v 1.3 1994/02/18 02:28:10 jtc Exp $"; 15 #endif 16 17 /* 18 * wrapper sqrt(x) 19 */ 20 21 #include <math.h> 22 23 #ifdef __STDC__ 24 double sqrt(double x) /* wrapper sqrt */ 25 #else 26 double sqrt(x) /* wrapper sqrt */ 27 double x; 28 #endif 29 { 30 #ifdef _IEEE_LIBM 31 return __ieee754_sqrt(x); 32 #else 33 double z; 34 z = __ieee754_sqrt(x); 35 if(_LIB_VERSION == _IEEE_ || isnan(x)) return z; 36 if(x<0.0) { 37 return __kernel_standard(x,x,26); /* sqrt(negative) */ 38 } else 39 return z; 40 #endif 41 } 42