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/* Exercise the lc2exp random functions.
Copyright 2002 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
#include <stdio.h>
#include <stdlib.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "tests.h"
/* a=0 and c=0 produces zero results always. */
void
check_zero (unsigned long m2exp)
{
gmp_randstate_t r;
mpz_t a;
unsigned long c;
int i;
mpz_init_set_ui (a, 0L);
c = 0L;
gmp_randinit_lc_2exp (r, a, c, m2exp);
gmp_randseed_ui (r, 0L);
for (i = 0; i < 5; i++)
{
mpz_urandomb (a, r, 123L);
if (mpz_sgn (a) != 0)
{
printf ("check_zero m2exp=%lu: didn't get zero\n", m2exp);
gmp_printf (" rand=%#Zx\n", a);
abort ();
}
}
mpz_clear (a);
gmp_randclear (r);
}
/* negative a */
void
check_nega (void)
{
gmp_randstate_t r;
mpz_t a;
unsigned long c, m2exp;
int i;
mpz_init (a);
mpz_setbit (a, 1000L);
mpz_neg (a, a);
c = 0L;
m2exp = 45L;
gmp_randinit_lc_2exp (r, a, c, m2exp);
gmp_randseed_ui (r, 0L);
for (i = 0; i < 5; i++)
{
mpz_urandomb (a, r, 123L);
if (mpz_sgn (a) != 0)
printf ("check_nega m2exp=%lu: didn't get zero\n", m2exp);
}
mpz_clear (a);
gmp_randclear (r);
}
void
check_bigc (void)
{
gmp_randstate_t r;
mpz_t a;
unsigned long c, m2exp, bits;
int i;
mpz_init_set_ui (a, 0L);
c = ULONG_MAX;
m2exp = 8;
gmp_randinit_lc_2exp (r, a, c, m2exp);
gmp_randseed_ui (r, 0L);
for (i = 0; i < 20; i++)
{
bits = 123L;
mpz_urandomb (a, r, bits);
if (mpz_sgn (a) < 0 || mpz_sizeinbase (a, 2) > bits)
{
printf ("check_bigc: mpz_urandomb out of range\n");
printf (" m2exp=%lu\n", m2exp);
gmp_printf (" rand=%#ZX\n", a);
gmp_printf (" sizeinbase2=%u\n", mpz_sizeinbase (a, 2));
}
}
mpz_clear (a);
gmp_randclear (r);
}
void
check_bigc1 (void)
{
gmp_randstate_t r;
mpz_t a;
unsigned long c, m2exp;
int i;
mpz_init_set_ui (a, 0L);
c = ULONG_MAX;
m2exp = 2;
gmp_randinit_lc_2exp (r, a, c, m2exp);
gmp_randseed_ui (r, 0L);
for (i = 0; i < 20; i++)
{
mpz_urandomb (a, r, 1L);
if (mpz_cmp_ui (a, 1L) != 0)
{
printf ("check_bigc1: mpz_urandomb didn't give 1\n");
printf (" m2exp=%lu\n", m2exp);
gmp_printf (" got rand=%#ZX\n", a);
abort ();
}
}
mpz_clear (a);
gmp_randclear (r);
}
/* Checks parameters which triggered an assertion failure in the past.
Happened when limbs(a)+limbs(c) < bits_to_limbs(m2exp). */
void
check_bigm (void)
{
gmp_randstate_t rstate;
mpz_t a;
mpz_init_set_ui (a, 5L);
gmp_randinit_lc_2exp (rstate, a, 1L, 384L);
mpz_urandomb (a, rstate, 20L);
gmp_randclear (rstate);
mpz_clear (a);
}
/* Checks for seeds bigger than the modulus. */
void
check_bigs (void)
{
gmp_randstate_t rstate;
mpz_t sd, a;
int i;
mpz_init (sd);
mpz_setbit (sd, 300L);
mpz_sub_ui (sd, sd, 1L);
mpz_clrbit (sd, 13L);
mpz_init_set_ui (a, 123456789L);
gmp_randinit_lc_2exp (rstate, a, 5L, 64L);
for (i = 0; i < 20; i++)
{
mpz_neg (sd, sd);
gmp_randseed (rstate, sd);
mpz_mul_ui (sd, sd, 7L);
mpz_urandomb (a, rstate, 80L);
}
gmp_randclear (rstate);
mpz_clear (a);
mpz_clear (sd);
}
int
main (void)
{
tests_start ();
check_zero (2L);
check_zero (7L);
check_zero (32L);
check_zero (64L);
check_zero (1000L);
check_nega ();
check_bigc ();
check_bigc1 ();
check_bigm ();
check_bigs ();
tests_end ();
exit (0);
}
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