65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/* mpz_set_f (dest_integer, src_float) -- Assign DEST_INTEGER from SRC_FLOAT.
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Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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void
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#if __STDC__
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mpz_set_f (mpz_ptr w, mpf_srcptr u)
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#else
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mpz_set_f (w, u)
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mpz_ptr w;
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mpf_srcptr u;
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#endif
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{
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mp_ptr wp, up;
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mp_size_t usize, size;
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mp_exp_t exp;
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usize = SIZ (u);
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size = ABS (usize);
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exp = EXP (u);
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if (w->_mp_alloc < exp)
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_mpz_realloc (w, exp);
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wp = w->_mp_d;
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up = u->_mp_d;
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if (exp <= 0)
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{
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SIZ (w) = 0;
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return;
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}
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if (exp < size)
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{
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MPN_COPY (wp, up + size - exp, exp);
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}
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else
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{
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MPN_ZERO (wp, exp - size);
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MPN_COPY (wp + exp - size, up, size);
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}
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w->_mp_size = usize >= 0 ? exp : -exp;
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}
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