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Annotation of OpenXM_contrib/gmp/mpz/random.c, Revision 1.1.1.1

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: }