60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
|
/* mpf_init_set -- Initialize a float and assign it from another float.
|
||
|
|
|
||
|
|
Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
This file is part of the GNU MP Library.
|
||
|
|
|
||
|
|
The GNU MP 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 GNU MP 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.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Library General Public License
|
||
|
|
along with the GNU MP 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 "gmp.h"
|
||
|
|
#include "gmp-impl.h"
|
||
|
|
|
||
|
|
void
|
||
|
|
#if __STDC__
|
||
|
|
mpf_init_set (mpf_ptr r, mpf_srcptr s)
|
||
|
|
#else
|
||
|
|
mpf_init_set (r, s)
|
||
|
|
mpf_ptr r;
|
||
|
|
mpf_srcptr s;
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
mp_ptr rp, sp;
|
||
|
|
mp_size_t ssize, size;
|
||
|
|
mp_size_t prec;
|
||
|
|
|
||
|
|
prec = __gmp_default_fp_limb_precision;
|
||
|
|
r->_mp_d = (mp_ptr) (*_mp_allocate_func) ((prec + 1) * BYTES_PER_MP_LIMB);
|
||
|
|
r->_mp_prec = prec;
|
||
|
|
|
||
|
|
prec++; /* lie not to lose precision in assignment */
|
||
|
|
ssize = s->_mp_size;
|
||
|
|
size = ABS (ssize);
|
||
|
|
|
||
|
|
rp = r->_mp_d;
|
||
|
|
sp = s->_mp_d;
|
||
|
|
|
||
|
|
if (size > prec)
|
||
|
|
{
|
||
|
|
sp += size - prec;
|
||
|
|
size = prec;
|
||
|
|
}
|
||
|
|
|
||
|
|
MPN_COPY (rp, sp, size);
|
||
|
|
|
||
|
|
r->_mp_exp = s->_mp_exp;
|
||
|
|
r->_mp_size = ssize >= 0 ? size : -size;
|
||
|
|
}
|