source: trunk/sys/libm/w_log.c @ 95

/* @(#)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.
 * ====================================================
 */

/*
 * wrapper log(x)
 */

#include <libm/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
}