/usr/src/openvswitch-1.4.0/tests/test-util.c is in openvswitch-datapath-dkms 1.4.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | /*
* Copyright (c) 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include "random.h"
#include "util.h"
static void
check_log_2_floor(uint32_t x, int n)
{
if (log_2_floor(x) != n) {
fprintf(stderr, "log_2_floor(%"PRIu32") is %d but should be %d\n",
x, log_2_floor(x), n);
abort();
}
}
static void
check_ctz(uint32_t x, int n)
{
if (ctz(x) != n) {
fprintf(stderr, "ctz(%"PRIu32") is %d but should be %d\n",
x, ctz(x), n);
abort();
}
}
int
main(void)
{
int n;
for (n = 0; n < 32; n++) {
/* Check minimum x such that f(x) == n. */
check_log_2_floor(1 << n, n);
check_ctz(1 << n, n);
/* Check maximum x such that f(x) == n. */
check_log_2_floor((1 << n) | ((1 << n) - 1), n);
check_ctz(UINT32_MAX << n, n);
/* Check a random value in the middle. */
check_log_2_floor((random_uint32() & ((1 << n) - 1)) | (1 << n), n);
check_ctz((random_uint32() | 1) << n, n);
}
/* Check ctz(0).
* (log_2_floor(0) is undefined.) */
check_ctz(0, 32);
return 0;
}
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