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/* Copyright (C) 1993 Hongjiu Lu
Changed by Olaf Flebbe for long double
This file is part of the Linux C Library.
The Linux C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The Linux 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
Library General Public License for more details. */
/*
Original Code by John C. Bowman (bowman@hagar.ph.utexas.edu).
*/
#include <ansidecl.h>
#include <errno.h>
#include <math.h>
long double
DEFUN(atanhl, (x), long double x)
{
long double y = fabsl( x);
if (y >= 1.0 ) {
if (y==1.0)
return __infnanl( ERANGE);
else
return __infnanl( (x > 0? EDOM:-EDOM));
}
return copysignl( 0.5*log1pl(-2.0*y/(1.0+y)), x);
}
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