Annotation of OpenXM/src/kan96xx/gmp-2.0.2/mpz/set_f.c, Revision 1.1.1.1
1.1 maekawa 1: /* mpz_set_f (dest_integer, src_float) -- Assign DEST_INTEGER from SRC_FLOAT.
2:
3: Copyright (C) 1996 Free Software Foundation, Inc.
4:
5: This file is part of the GNU MP Library.
6:
7: The GNU MP Library is free software; you can redistribute it and/or modify
8: it under the terms of the GNU Library General Public License as published by
9: the Free Software Foundation; either version 2 of the License, or (at your
10: option) any later version.
11:
12: The GNU MP Library is distributed in the hope that it will be useful, but
13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
15: License for more details.
16:
17: You should have received a copy of the GNU Library General Public License
18: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20: MA 02111-1307, USA. */
21:
22: #include "gmp.h"
23: #include "gmp-impl.h"
24:
25: void
26: #if __STDC__
27: mpz_set_f (mpz_ptr w, mpf_srcptr u)
28: #else
29: mpz_set_f (w, u)
30: mpz_ptr w;
31: mpf_srcptr u;
32: #endif
33: {
34: mp_ptr wp, up;
35: mp_size_t usize, size;
36: mp_exp_t exp;
37:
38: usize = SIZ (u);
39: size = ABS (usize);
40: exp = EXP (u);
41:
42: if (w->_mp_alloc < exp)
43: _mpz_realloc (w, exp);
44:
45: wp = w->_mp_d;
46: up = u->_mp_d;
47:
48: if (exp <= 0)
49: {
50: SIZ (w) = 0;
51: return;
52: }
53: if (exp < size)
54: {
55: MPN_COPY (wp, up + size - exp, exp);
56: }
57: else
58: {
59: MPN_ZERO (wp, exp - size);
60: MPN_COPY (wp + exp - size, up, size);
61: }
62:
63: w->_mp_size = usize >= 0 ? exp : -exp;
64: }
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