t-scan.c
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上传日期:2022-08-06
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- /* Tests of mpz_scan0 and mpz_scan1.
- Copyright 2000, 2001, 2002, 2003 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"
- unsigned long
- refmpz_scan (mpz_srcptr z, unsigned long i, int sought)
- {
- unsigned long z_bits = (unsigned long) ABSIZ(z) * GMP_NUMB_BITS;
- do
- {
- if (mpz_tstbit (z, i) == sought)
- return i;
- i++;
- }
- while (i <= z_bits);
- return ULONG_MAX;
- }
- unsigned long
- refmpz_scan0 (mpz_srcptr z, unsigned long starting_bit)
- {
- return refmpz_scan (z, starting_bit, 0);
- }
- unsigned long
- refmpz_scan1 (mpz_srcptr z, unsigned long starting_bit)
- {
- return refmpz_scan (z, starting_bit, 1);
- }
- void
- check_ref (void)
- {
- static const int offset[] = {
- -2, -1, 0, 1, 2, 3
- };
- mpz_t z;
- int test, neg, sought, oindex, o;
- mp_size_t size, isize;
- unsigned long start, got, want;
- mpz_init (z);
- for (test = 0; test < 5; test++)
- {
- for (size = 0; size < 5; size++)
- {
- mpz_random2 (z, size);
- for (neg = 0; neg <= 1; neg++)
- {
- if (neg)
- mpz_neg (z, z);
- for (isize = 0; isize <= size; isize++)
- {
- for (oindex = 0; oindex <= numberof (offset); oindex++)
- {
- o = offset[oindex];
- if ((int) isize*GMP_NUMB_BITS < -o)
- continue; /* start would be negative */
- start = isize*GMP_NUMB_BITS + o;
- for (sought = 0; sought <= 1; sought++)
- {
- if (sought == 0)
- {
- got = mpz_scan0 (z, start);
- want = refmpz_scan0 (z, start);
- }
- else
- {
- got = mpz_scan1 (z, start);
- want = refmpz_scan1 (z, start);
- }
- if (got != want)
- {
- printf ("wrong at test=%d, size=%ld, neg=%d, start=%lu, sought=%dn",
- test, size, neg, start, sought);
- printf (" z 0x");
- mpz_out_str (stdout, -16, z);
- printf ("n");
- printf (" got=%lu, want=%lun", got, want);
- exit (1);
- }
- }
- }
- }
- }
- }
- }
- mpz_clear (z);
- }
- int
- main (int argc, char *argv[])
- {
- tests_start ();
- check_ref ();
- tests_end ();
- exit (0);
- }