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glibc/math/s_clog10l.c
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/* Compute complex base 10 logarithm. | |
Copyright (C) 1997, 1998 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#include <complex.h> | |
#include <math.h> | |
#include "math_private.h" | |
__complex__ long double | |
__clog10l (__complex__ long double x) | |
{ | |
__complex__ long double result; | |
int rcls = fpclassify (__real__ x); | |
int icls = fpclassify (__imag__ x); | |
if (rcls == FP_ZERO && icls == FP_ZERO) | |
{ | |
/* Real and imaginary part are 0.0. */ | |
__imag__ result = signbit (__real__ x) ? M_PIl : 0.0; | |
__imag__ result = __copysignl (__imag__ result, __imag__ x); | |
/* Yes, the following line raises an exception. */ | |
__real__ result = -1.0 / fabsl (__real__ x); | |
} | |
else if (rcls != FP_NAN && icls != FP_NAN) | |
{ | |
/* Neither real nor imaginary part is NaN. */ | |
__real__ result = __ieee754_log10l (__ieee754_hypotl (__real__ x, | |
__imag__ x)); | |
__imag__ result = M_LOG10El * __ieee754_atan2l (__imag__ x, __real__ x); | |
} | |
else | |
{ | |
__imag__ result = __nanl (""); | |
if (rcls == FP_INFINITE || icls == FP_INFINITE) | |
/* Real or imaginary part is infinite. */ | |
__real__ result = HUGE_VALL; | |
else | |
__real__ result = __nanl (""); | |
} | |
return result; | |
} | |
weak_alias (__clog10l, clog10l) |