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packets: Add more utility functions for IPv4 and IPv6 addresses.

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We had these functions scattered around the source tree anyway.  packets.h
is a good place to centralize them.

I do plan to introduce some additional callers.
This commit is contained in:
Ben Pfaff
2011-08-17 10:55:15 -07:00
parent e7ed3a3a5f
commit aad29cd1a1
7 changed files with 119 additions and 45 deletions
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31
tests/test-util.c
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@@ -17,6 +17,7 @@
#include <config.h>
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
@@ -24,7 +25,7 @@
#include "util.h"
static void
check(uint32_t x, int n)
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",
@@ -33,20 +34,38 @@ check(uint32_t x, int n)
}
}
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 that has log2(x) == n. */
check(1 << n, n);
/* Check minimum x such that f(x) == n. */
check_log_2_floor(1 << n, n);
check_ctz(1 << n, n);
/* Check maximum x that has log2(x) == n. */
check((1 << n) | ((1 << n) - 1), 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((random_uint32() & ((1 << n) - 1)) | (1 << n), n);
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;
}