1 2 /* @(#)w_log.c 1.3 95/01/18 */ 3 /* 4 * ==================================================== 5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 6 * 7 * Developed at SunSoft, a Sun Microsystems, Inc. business. 8 * Permission to use, copy, modify, and distribute this 9 * software is freely granted, provided that this notice 10 * is preserved. 11 * ==================================================== 12 */ 13 14 /* 15 * wrapper ieee_log(x) 16 */ 17 18 #include "fdlibm.h" 19 20 21 #ifdef __STDC__ 22 double ieee_log(double x) /* wrapper log */ 23 #else 24 double ieee_log(x) /* wrapper log */ 25 double x; 26 #endif 27 { 28 #ifdef _IEEE_LIBM 29 return __ieee754_log(x); 30 #else 31 double z; 32 z = __ieee754_log(x); 33 if(_LIB_VERSION == _IEEE_ || ieee_isnan(x) || x > 0.0) return z; 34 if(x==0.0) 35 return __kernel_standard(x,x,16); /* ieee_log(0) */ 36 else 37 return __kernel_standard(x,x,17); /* ieee_log(x<0) */ 38 #endif 39 } 40
