lib/msun/src/w_log10.c

/* @(#)w_log10.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.
 * ====================================================
 */

#ifndef lint
static char rcsid[] = "$Id: w_log10.c,v 1.3 1994/02/18 02:27:58 jtc Exp $";
#endif

/*
 * wrapper log10(X)
 */

#include "math.h"


#ifdef __STDC__
        double log10(double x)          /* wrapper log10 */
#else
        double log10(x)                 /* wrapper log10 */
        double x;
#endif
{
#ifdef _IEEE_LIBM
        return __ieee754_log10(x);
#else
        double z;
        z = __ieee754_log10(x);
        if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
        if(x<=0.0) {
            if(x==0.0)
                return __kernel_standard(x,x,18); /* log10(0) */
            else
                return __kernel_standard(x,x,19); /* log10(x<0) */
        } else
            return z;
#endif
}