NetBSD-5.0.2/lib/libm/src/w_log10f.c

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/* w_log10f.c -- float version of w_log10.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * 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.
 * ====================================================
 */

#include <sys/cdefs.h>
#if defined(LIBM_SCCS) && !defined(lint)
__RCSID("$NetBSD: w_log10f.c,v 1.6 2002/05/26 22:02:02 wiz Exp $");
#endif

/*
 * wrapper log10f(X)
 */

#include "math.h"
#include "math_private.h"


float
log10f(float x)		/* wrapper log10f */
{
#ifdef _IEEE_LIBM
	return __ieee754_log10f(x);
#else
	float z;
	z = __ieee754_log10f(x);
	if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z;
	if(x<=(float)0.0) {
	    if(x==(float)0.0)
	        /* log10(0) */
	        return (float)__kernel_standard((double)x,(double)x,118);
	    else
	        /* log10(x<0) */
	        return (float)__kernel_standard((double)x,(double)x,119);
	} else
	    return z;
#endif
}