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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: }