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Annotation of OpenXM_contrib/gmp/mpfr/save_expo.c, Revision 1.1

1.1     ! ohara       1: /* Save/restore the minimum and maximum exponents.
        !             2:
        !             3: Copyright 2001 Free Software Foundation, Inc.
        !             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 Lesser General Public License as published by
        !             9: the Free Software Foundation; either version 2.1 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 Lesser General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Lesser 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 <stdlib.h>
        !            24: #include "gmp.h"
        !            25: #include "mpfr.h"
        !            26: #include "mpfr-impl.h"
        !            27:
        !            28: static unsigned int saved_flags;
        !            29: static mp_exp_t saved_emin;
        !            30: static mp_exp_t saved_emax;
        !            31: static unsigned int save_ctr = 0;
        !            32:
        !            33: void
        !            34: mpfr_save_emin_emax (void)
        !            35: {
        !            36:   if (save_ctr++ == 0)
        !            37:     {
        !            38:       saved_flags = __mpfr_flags;
        !            39:       saved_emin = __mpfr_emin;
        !            40:       saved_emax = __mpfr_emax;
        !            41:       __mpfr_emin = MPFR_EMIN_MIN;
        !            42:       __mpfr_emax = MPFR_EMAX_MAX;
        !            43:     }
        !            44:   else if (save_ctr == 0)
        !            45:     {
        !            46:       fprintf(stderr,
        !            47:               "Error: Too many consecutive calls to mpfr_save_emin_emax!\n"
        !            48:               "Probably a bug.\n");
        !            49:       exit(1);
        !            50:     }
        !            51: }
        !            52:
        !            53: void
        !            54: mpfr_restore_emin_emax (void)
        !            55: {
        !            56:   if (--save_ctr == 0)
        !            57:     {
        !            58:       __mpfr_flags = saved_flags;
        !            59:       __mpfr_emin = saved_emin;
        !            60:       __mpfr_emax = saved_emax;
        !            61:     }
        !            62: }