--- /dev/null
+/* 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=%d\n",
+ test, size, neg, start, sought);
+ printf (" z 0x");
+ mpz_out_str (stdout, -16, z);
+ printf ("\n");
+ printf (" got=%lu, want=%lu\n", got, want);
+ exit (1);
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ mpz_clear (z);
+}
+
+
+int
+main (int argc, char *argv[])
+{
+ tests_start ();
+
+ check_ref ();
+
+ tests_end ();
+ exit (0);
+}