Annotation of OpenXM_contrib/gmp/mpfr/set_prec.c, Revision 1.1.1.1
1.1 maekawa 1: /* mpfr_set_prec -- reset the precision of a floating-point number
2:
3: Copyright (C) 1999 PolKA project, Inria Lorraine and Loria
4:
5: This file is part of the MPFR Library.
6:
7: The MPFR 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 MPFR 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 MPFR 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 <stdio.h>
23: #include "gmp.h"
24: #include "gmp-impl.h"
25: #include "mpfr.h"
26:
27: void
28: #if __STDC__
29: mpfr_set_prec (mpfr_t x, unsigned long int p)
30: #else
31: mpfr_set_prec (x, p)
32: mpfr_t x;
33: unsigned long int p;
34: #endif
35: {
36: unsigned long xsize;
37:
38: if (p==0) {
39: printf("*** cannot set precision to 0 bits\n"); exit(1);
40: }
41:
42: xsize = (p - 1)/BITS_PER_MP_LIMB + 1; /* new limb size */
43:
44: if (xsize > ABSSIZE(x)) {
45: x -> _mp_d = (mp_ptr) (*_mp_reallocate_func)
46: (x -> _mp_d, ABSSIZE(x)*BYTES_PER_MP_LIMB, xsize * BYTES_PER_MP_LIMB);
47: SIZE(x) = xsize; /* new number of allocated limbs */
48: }
49:
50: x -> _mp_prec = p;
51: }
52:
53: unsigned long int
54: #if __STDC__
55: mpfr_get_prec (mpfr_t x)
56: #else
57: mpfr_get_prec (x)
58: mpfr_t x;
59: #endif
60: {
61: return x -> _mp_prec;
62: }
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