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Annotation of OpenXM_contrib/gmp/mpfr/set_prec.c, Revision 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: }