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Annotation of OpenXM_contrib/gmp/mpfr/set_prec.c, Revision 1.1.1.2

1.1       maekawa     1: /* mpfr_set_prec -- reset the precision of a floating-point number
                      2:
1.1.1.2 ! ohara       3: Copyright 1999, 2001 Free Software Foundation, Inc.
1.1       maekawa     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
1.1.1.2 ! ohara       8: it under the terms of the GNU Lesser General Public License as published by
        !             9: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    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
1.1.1.2 ! ohara      14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    15: License for more details.
                     16:
1.1.1.2 ! ohara      17: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    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"
1.1.1.2 ! ohara      26: #include "mpfr-impl.h"
1.1       maekawa    27:
1.1.1.2 ! ohara      28: int
        !            29: mpfr_set_prec (mpfr_ptr x, mp_prec_t p)
1.1       maekawa    30: {
1.1.1.2 ! ohara      31:   mp_size_t xsize;
1.1       maekawa    32:
1.1.1.2 ! ohara      33:   MPFR_ASSERTN(p >= MPFR_PREC_MIN && p <= MPFR_PREC_MAX);
1.1       maekawa    34:
1.1.1.2 ! ohara      35:   xsize = (p - 1) / BITS_PER_MP_LIMB + 1; /* new limb size */
1.1       maekawa    36:
1.1.1.2 ! ohara      37:   if (xsize > MPFR_ABSSIZE(x))
        !            38:     {
        !            39:       MPFR_MANT(x) = (mp_ptr) (*__gmp_reallocate_func)
        !            40:         (MPFR_MANT(x), (size_t) MPFR_ABSSIZE(x) * BYTES_PER_MP_LIMB,
        !            41:          (size_t) xsize * BYTES_PER_MP_LIMB);
        !            42:       MPFR_SIZE(x) = xsize; /* new number of allocated limbs */
        !            43:     }
1.1       maekawa    44:
1.1.1.2 ! ohara      45:   MPFR_PREC(x) = p;
        !            46:   MPFR_SET_NAN(x); /* initializes to NaN */
        !            47:
        !            48:   return MPFR_MANT(x) == NULL;
1.1       maekawa    49: }
                     50:
1.1.1.2 ! ohara      51: mp_prec_t
        !            52: mpfr_get_prec (mpfr_srcptr x)
1.1       maekawa    53: {
1.1.1.2 ! ohara      54:   return MPFR_PREC(x);
1.1       maekawa    55: }