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/* wf_log.c -- float version of w_log.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.
* ====================================================
*/
/*
* wrapper logf(x)
*/
#include "fdlibm.h"
#if __OBSOLETE_MATH_FLOAT
#include <errno.h>
#if !defined(_IEEE_LIBM) || !defined(HAVE_ALIAS_ATTRIBUTE)
#ifdef __STDC__
float logf(float x) /* wrapper logf */
#else
float logf(x) /* wrapper logf */
float x;
#endif
{
float z;
z = __ieee754_logf(x);
if(_LIB_VERSION == _IEEE_ || isnan(x) || x > 0.0f) return z;
if(x==0.0f) {
/* logf(0) */
errno = ERANGE;
return -HUGE_VALF;
} else {
/* logf(x<0) */
errno = EDOM;
return nanf("");
}
}
#endif
#ifdef _DOUBLE_IS_32BITS
#ifdef __STDC__
double log(double x)
#else
double log(x)
double x;
#endif
{
return (double) logf((float) x);
}
#endif /* defined(_DOUBLE_IS_32BITS) */
#endif /* __OBSOLETE_MATH_FLOAT */
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