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70317d8506
* libm/mathfp/s_logarithm.c: Fix error introduced by previous
fix when handling negative input values. Make function
consistent with math directory and glibc version such that
inf and nan values return inf and nan respectively with no
errno setting.
* libm/mathfp/sf_logarithm.c: Ditto.
* libm/math/w_log.c: Set errno to ERANGE when input is 0.0.
* libm/math/wf_log.c: Ditto.
* libm/math/w_log10.c: Ditto.
* libm/math/wf_log10.c: Ditto.
87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
/* wf_log.c -- float version of w_log.c.
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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/*
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* wrapper logf(x)
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*/
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#include "fdlibm.h"
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#include <errno.h>
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#ifdef __STDC__
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float logf(float x) /* wrapper logf */
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#else
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float logf(x) /* wrapper logf */
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float x;
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#endif
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{
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#ifdef _IEEE_LIBM
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return __ieee754_logf(x);
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#else
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float z;
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struct exception exc;
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z = __ieee754_logf(x);
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if(_LIB_VERSION == _IEEE_ || isnanf(x) || x > (float)0.0) return z;
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#ifndef HUGE_VAL
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#define HUGE_VAL inf
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double inf = 0.0;
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SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */
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#endif
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exc.name = "logf";
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exc.err = 0;
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exc.arg1 = exc.arg2 = (double)x;
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if (_LIB_VERSION == _SVID_)
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exc.retval = -HUGE;
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else
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exc.retval = -HUGE_VAL;
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if(x==(float)0.0) {
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/* logf(0) */
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exc.type = SING;
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if (_LIB_VERSION == _POSIX_)
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errno = ERANGE;
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else if (!matherr(&exc)) {
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errno = ERANGE;
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}
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} else {
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/* logf(x<0) */
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exc.type = DOMAIN;
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if (_LIB_VERSION == _POSIX_)
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errno = EDOM;
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else if (!matherr(&exc)) {
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errno = EDOM;
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}
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exc.retval = nan("");
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}
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if (exc.err != 0)
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errno = exc.err;
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return (float)exc.retval;
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#endif
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}
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#ifdef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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double log(double x)
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#else
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double log(x)
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double x;
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#endif
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{
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return (double) logf((float) x);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */
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