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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [w_log10.c] - Rev 414
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/* @(#)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. * ==================================================== */ /* FUNCTION <<log10>>, <<log10f>>---base 10 logarithms INDEX log10 INDEX log10f ANSI_SYNOPSIS #include <math.h> double log10(double <[x]>); float log10f(float <[x]>); TRAD_SYNOPSIS #include <math.h> double log10(<[x]>) double <[x]>; float log10f(<[x]>) float <[x]>; DESCRIPTION <<log10>> returns the base 10 logarithm of <[x]>. It is implemented as <<log(<[x]>) / log(10)>>. <<log10f>> is identical, save that it takes and returns <<float>> values. RETURNS <<log10>> and <<log10f>> return the calculated value. See the description of <<log>> for information on errors. PORTABILITY <<log10>> is ANSI C. <<log10f>> is an extension. */ /* * wrapper log10(X) */ #include "fdlibm.h" #include <errno.h> #ifndef _DOUBLE_IS_32BITS #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; struct exception exc; z = __ieee754_log10(x); if(_LIB_VERSION == _IEEE_ || isnan(x)) return z; if(x<=0.0) { #ifndef HUGE_VAL #define HUGE_VAL inf double inf = 0.0; SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ #endif exc.name = "log10"; exc.err = 0; exc.arg1 = x; exc.arg2 = x; if (_LIB_VERSION == _SVID_) exc.retval = -HUGE; else exc.retval = -HUGE_VAL; if(x==0.0) { /* log10(0) */ exc.type = SING; if (_LIB_VERSION == _POSIX_) errno = ERANGE; else if (!matherr(&exc)) { errno = ERANGE; } } else { /* log10(x<0) */ exc.type = DOMAIN; if (_LIB_VERSION == _POSIX_) errno = EDOM; else if (!matherr(&exc)) { errno = EDOM; } exc.retval = nan(""); } if (exc.err != 0) errno = exc.err; return exc.retval; } else return z; #endif } #endif /* defined(_DOUBLE_IS_32BITS) */
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