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 1.7 1997/10/09 11:35:39 lukem Exp $"); 16 #endif 17 18 /* 19 * wrapper log10(X) 20 */ 21 22 #include "math.h" 23 #include "math_private.h" 24 25 26 #ifdef __STDC__ 27 double log10(double x) /* wrapper log10 */ 28 #else 29 double log10(x) /* wrapper log10 */ 30 double x; 31 #endif 32 { 33 #ifdef _IEEE_LIBM 34 return __ieee754_log10(x); 35 #else 36 double z; 37 z = __ieee754_log10(x); 38 if(_LIB_VERSION == _IEEE_ || isnan(x)) return z; 39 if(x<=0.0) { 40 if(x==0.0) 41 return __kernel_standard(x,x,18); /* log10(0) */ 42 else 43 return __kernel_standard(x,x,19); /* log10(x<0) */ 44 } else 45 return z; 46 #endif 47 } 48