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Annotation of OpenXM_contrib/gmp/mpfr/save_expo.c, Revision 1.1.1.1

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: }