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/* mpfr_copysign -- Produce a value with the magnitude of x and sign of y
Copyright (C) 2001 Free Software Foundation.
This file is part of the MPFR Library.
The MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "mpfr.h"
#include "mpfr-impl.h"
/* The computation of z with magnitude of x and sign of y
z = sign(y) * abs(x)
*/
int
mpfr_copysign (mpfr_ptr z, mpfr_srcptr x ,mpfr_srcptr y , mp_rnd_t rnd_mode)
{
if (MPFR_IS_NAN(y))
{
MPFR_SET_NAN(z);
return 1;
}
if (MPFR_IS_NAN(x))
{
MPFR_SET_NAN(z);
MPFR_SET_SAME_SIGN(z,y);
return 1;
}
MPFR_CLEAR_NAN(z);
if (MPFR_IS_INF(x)) {
MPFR_SET_INF(z);
MPFR_SET_SAME_SIGN(z,y);
return 0;
}
MPFR_CLEAR_INF(z);
if (!MPFR_NOTZERO(x))
{
MPFR_SET_ZERO(z);
MPFR_SET_SAME_SIGN(z,y);
return 0;
}
/* GENERAL CASE*/
{
int inexact=0;
inexact =mpfr_set(z,x,rnd_mode);
MPFR_SET_SAME_SIGN(z,y);
return inexact;
}
}
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