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Annotation of OpenXM_contrib/gmp/mpz/random.c, Revision 1.1

1.1     ! maekawa     1: /* mpz_random -- Generate a random mpz_t of specified size.
        !             2:    This function is non-portable and generates poor random numbers.
        !             3:
        !             4: Copyright (C) 1991, 1993, 1994, 1995 Free Software Foundation, Inc.
        !             5:
        !             6: This file is part of the GNU MP Library.
        !             7:
        !             8: The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: it under the terms of the GNU Library General Public License as published by
        !            10: the Free Software Foundation; either version 2 of the License, or (at your
        !            11: option) any later version.
        !            12:
        !            13: The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            16: License for more details.
        !            17:
        !            18: You should have received a copy of the GNU Library General Public License
        !            19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: MA 02111-1307, USA. */
        !            22:
        !            23: #include "gmp.h"
        !            24: #include "gmp-impl.h"
        !            25: #include "urandom.h"
        !            26:
        !            27: void
        !            28: #if __STDC__
        !            29: mpz_random (mpz_ptr x, mp_size_t size)
        !            30: #else
        !            31: mpz_random (x, size)
        !            32:      mpz_ptr x;
        !            33:      mp_size_t size;
        !            34: #endif
        !            35: {
        !            36:   mp_size_t i;
        !            37:   mp_limb_t ran;
        !            38:   mp_ptr xp;
        !            39:   mp_size_t abs_size;
        !            40:
        !            41:   abs_size = ABS (size);
        !            42:
        !            43:   if (x->_mp_alloc < abs_size)
        !            44:     _mpz_realloc (x, abs_size);
        !            45:
        !            46:   xp = x->_mp_d;
        !            47:
        !            48:   for (i = 0; i < abs_size; i++)
        !            49:     {
        !            50:       ran = urandom ();
        !            51:       xp[i] = ran;
        !            52:     }
        !            53:
        !            54:   MPN_NORMALIZE (xp, abs_size);
        !            55:   x->_mp_size = size < 0 ? -abs_size : abs_size;
        !            56: }