69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/* mpz_random -- Generate a random MP_INT of specified size.
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Copyright (C) 1991, 1993 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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The GNU MP Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the GNU MP Library; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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#if defined (hpux) || defined (__alpha__)
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/* HPUX lacks random(). DEC Alpha's random() returns a double. */
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static inline long
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urandom ()
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{
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return mrand48 ();
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}
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#else
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long random ();
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static inline long
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urandom ()
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{
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/* random() returns 31 bits, we want 32. */
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return random() ^ (random() << 1);
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}
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#endif
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void
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#ifdef __STDC__
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mpz_random (MP_INT *x, mp_size size)
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#else
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mpz_random (x, size)
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MP_INT *x;
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mp_size size;
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#endif
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{
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mp_size i;
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mp_limb ran;
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if (x->alloc < size)
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_mpz_realloc (x, size);
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for (i = 0; i < size; i++)
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{
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ran = urandom ();
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x->d[i] = ran;
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}
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for (i = size - 1; i >= 0; i--)
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if (x->d[i] != 0)
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break;
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x->size = i + 1;
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}
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