1 /* @(#)w_log10.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_log10.c,v 1.9 2002/05/26 22:02:02 wiz Exp $"); 16 #endif 17 18 /* 19 * wrapper log10(X) 20 */ 21 22 #include "math.h" 23 #include "math_private.h" 24 25 26 double 27 log10(double x) /* wrapper log10 */ 28 { 29 #ifdef _IEEE_LIBM 30 return __ieee754_log10(x); 31 #else 32 double z; 33 z = __ieee754_log10(x); 34 if(_LIB_VERSION == _IEEE_ || isnan(x)) return z; 35 if(x<=0.0) { 36 if(x==0.0) 37 return __kernel_standard(x,x,18); /* log10(0) */ 38 else 39 return __kernel_standard(x,x,19); /* log10(x<0) */ 40 } else 41 return z; 42 #endif 43 } 44