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/*
* Copyright (c) 2011, 2012 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 "command-line.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
test_log_2_floor(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
{
int n;
for (n = 0; n < 32; n++) {
/* Check minimum x such that f(x) == n. */
check_log_2_floor(1 << n, n);
/* Check maximum x such that f(x) == n. */
check_log_2_floor((1 << n) | ((1 << n) - 1), n);
/* Check a random value in the middle. */
check_log_2_floor((random_uint32() & ((1 << n) - 1)) | (1 << n), n);
}
/* log_2_floor(0) is undefined, so don't check it. */
}
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();
}
}
static void
test_ctz(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
{
int n;
for (n = 0; n < 32; n++) {
/* Check minimum x such that f(x) == n. */
check_ctz(1 << n, n);
/* Check maximum x such that f(x) == n. */
check_ctz(UINT32_MAX << n, n);
/* Check a random value in the middle. */
check_ctz((random_uint32() | 1) << n, n);
}
/* Check ctz(0). */
check_ctz(0, 32);
}
static void
test_follow_symlinks(int argc, char *argv[])
{
int i;
for (i = 1; i < argc; i++) {
char *target = follow_symlinks(argv[i]);
puts(target);
free(target);
}
}
static const struct command commands[] = {
{"ctz", 0, 0, test_ctz},
{"log_2_floor", 0, 0, test_log_2_floor},
{"follow-symlinks", 1, INT_MAX, test_follow_symlinks},
{NULL, 0, 0, NULL},
};
int
main(int argc, char *argv[])
{
set_program_name(argv[0]);
run_command(argc - 1, argv + 1, commands);
return 0;
}
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