| |
| /* @(#)w_log.c 1.3 95/01/18 */ |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunSoft, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| /* |
| * wrapper log(x) |
| */ |
| |
| #include "fdlibm.h" |
| |
| |
| #ifdef __STDC__ |
| double log(double x) /* wrapper log */ |
| #else |
| double log(x) /* wrapper log */ |
| double x; |
| #endif |
| { |
| #ifdef _IEEE_LIBM |
| return __ieee754_log(x); |
| #else |
| double z; |
| z = __ieee754_log(x); |
| if(_LIB_VERSION == _IEEE_ || isnan(x) || x > 0.0) return z; |
| if(x==0.0) |
| return __kernel_standard(x,x,16); /* log(0) */ |
| else |
| return __kernel_standard(x,x,17); /* log(x<0) */ |
| #endif |
| } |
