65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/* mpz_set_f (dest_integer, src_float) -- Assign DEST_INTEGER from SRC_FLOAT.
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Copyright 1996, 2001 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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 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 Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser 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., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, 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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mpz_set_f (mpz_ptr w, mpf_srcptr u)
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{
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mp_ptr wp, up;
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mp_size_t size;
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mp_exp_t exp;
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/* abs(u)<1 truncates to zero */
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exp = EXP (u);
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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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MPZ_REALLOC (w, exp);
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wp = PTR(w);
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up = PTR(u);
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size = SIZ (u);
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SIZ(w) = (size >= 0 ? exp : -exp);
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size = ABS (size);
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if (exp > size)
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{
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/* pad with low zeros to get a total "exp" many limbs */
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mp_size_t zeros = exp - size;
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MPN_ZERO (wp, zeros);
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wp += zeros;
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}
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else
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{
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/* exp<=size, trucate to the high "exp" many limbs */
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up += (size - exp);
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size = exp;
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}
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MPN_COPY (wp, up, size);
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}
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