mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-10-18 18:08:45 +00:00
147 lines
2.5 KiB
C
147 lines
2.5 KiB
C
/*
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* BIRD Library -- Generic Bit Operations Tests
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*
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* (c) 2015 CZ.NIC z.s.p.o.
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "test/birdtest.h"
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#include "bitops.h"
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#include "bitops.c" /* REMOVE ME */
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#define MAX_NUM 1000
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#define CHECK_BIT(var,pos) ((var) & (u32)(1<<(pos)))
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static int
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t_mkmask(void)
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{
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int i;
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u32 compute, expect;
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for (i = 0; i <= 32; i++)
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{
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compute = u32_mkmask(i);
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expect = (u32) (0xffffffff << (32-i));
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bt_assert_msg(compute == expect, "u32_mkmask(%d) = 0x%08X, expected 0x%08X \n", i, compute, expect);
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}
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return BT_SUCCESS;
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}
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static int
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u32_masklen_expected(u32 mask)
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{
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int j, expect = 0;
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int valid = 0;
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for (j = 0; j <= 32; j++)
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if (mask == (0xffffffff << (32-j)))
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valid = 1;
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if (!valid && mask != 0)
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expect = -1;
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else
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for (j = 0; j <= 31; j++)
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if (CHECK_BIT(mask, (31-j)))
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expect = j+1;
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else
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break;
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return expect;
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}
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void static
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check_mask(u32 mask)
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{
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int compute, expect;
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compute = u32_masklen_expected(mask);
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expect = u32_masklen(mask);
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int ok = compute == expect;
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bt_debug("u32_masklen(Ox%08x) = %d, expected %d %s\n", mask, u32_masklen(mask), u32_masklen_expected(mask), ok ? "OK" : "FAIL!");
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bt_assert(compute == expect);
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}
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static int
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t_masklen(void)
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{
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u32 i;
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check_mask(0x82828282);
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check_mask(0x00000000);
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for (i = 0; i <= 32; i++)
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check_mask(((u32) (0xffffffff << (32-i))) & 0xffffffff);
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for (i = 0; i <= MAX_NUM; i++)
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check_mask(bt_rand_num());
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return BT_SUCCESS;
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}
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static u32
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pow2(u32 exp)
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{
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u32 i, n, r;
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n = r = 2;
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if (exp == 0)
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return 1;
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for (i = 2; i <= exp; i++)
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r *= n;
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return r;
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}
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static void
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check_log2(u32 n)
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{
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u32 log = u32_log2(n);
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u32 low = pow2(log);
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u32 high = pow2(log+1);
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bt_debug("Test u32_log2(%u) = %u, %u should be in the range <%u, %u) \n", n, log, n, low, high);
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bt_assert(n >= low && n < high);
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}
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static int
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t_log2(void)
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{
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u32 i;
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struct in_out_data_ {
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u32 in;
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u32 out;
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} in_out_data[31];
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for (i = 0; i < 31; i++)
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{
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in_out_data[i].in = pow2(i+1);
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in_out_data[i].out = i+1;
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}
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bt_check(u32_log2, in_out_data, "%u", "%u");
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u32_log2(0);
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for (i = 1; i < MAX_NUM; i++)
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check_log2(i);
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for (i = 1; i < MAX_NUM; i++)
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check_log2(bt_rand_num());
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return BT_SUCCESS;
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}
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int
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main(int argc, char *argv[])
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{
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bt_init(argc, argv);
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bt_test_suite(t_mkmask, "u32_mkmask()");
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bt_test_suite(t_masklen, "u32_masklen()");
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bt_test_suite(t_log2, "u32_log2()");
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return 0;
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}
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