0,0 → 1,44 |
/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ |
/* @(#)w_log.c 5.1 93/09/24 */ |
/* |
* ==================================================== |
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
* |
* Developed at SunPro, a Sun Microsystems, Inc. business. |
* Permission to use, copy, modify, and distribute this |
* software is freely granted, provided that this notice |
* is preserved. |
* ==================================================== |
*/ |
|
#if defined(LIBM_SCCS) && !defined(lint) |
static char rcsid[] = "$Id: w_log.c,v 1.4 1994/08/10 20:35:09 jtc Exp $"; |
#endif |
|
/* |
* wrapper log(x) |
*/ |
|
#include "math.h" |
#include "math_private.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 |
} |