1/*-
2 * Copyright (c) 2023 The FreeBSD Foundation
3 *
4 * This software was developed by Robert Clausecker <fuz@FreeBSD.org>
5 * under sponsorship from the FreeBSD Foundation.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ''AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE
27 */
28
29#include <atf-c.h>
30#include <limits.h>
31#include <stdint.h>
32#include <strings.h>
33
34#ifndef FLS
35# define FLS fls
36# define TYPE int
37# define TYPE_MIN INT_MIN
38#endif
39
40ATF_TC_WITHOUT_HEAD(zero);
41ATF_TC_BODY(zero, tc)
42{
43	ATF_CHECK_EQ((TYPE)0, FLS(0));
44}
45
46ATF_TC_WITHOUT_HEAD(twobit);
47ATF_TC_BODY(twobit, tc)
48{
49	const TYPE one = 1;
50	TYPE x;
51	const int n = sizeof(TYPE) * CHAR_BIT;
52	int i, j;
53
54	for (i = 0; i < n - 1; i++)
55		for (j = 0; j <= i; j++) {
56			x = one << i | one << j;
57			ATF_CHECK_EQ_MSG(i + 1, FLS(x),
58			    "%s(%#jx) == %d != %d", __STRING(FLS), (intmax_t)x, FLS(x), i + 1);
59		}
60}
61
62ATF_TC_WITHOUT_HEAD(twobitneg);
63ATF_TC_BODY(twobitneg, tc)
64{
65	const TYPE one = 1;
66	TYPE x;
67	const int n = sizeof(TYPE) * CHAR_BIT;
68	int i, j;
69
70	for (i = 0; i < n - 1; i++)
71		for (j = 0; j <= i; j++) {
72			x = one << i | one << j | TYPE_MIN;
73			ATF_CHECK_EQ_MSG(n, FLS(x),
74			    "%s(%#jx) == %d != %d", __STRING(FLS), (intmax_t)x, FLS(x), n);
75		}
76}
77
78
79ATF_TP_ADD_TCS(tp)
80{
81
82	ATF_TP_ADD_TC(tp, zero);
83	ATF_TP_ADD_TC(tp, twobit);
84	ATF_TP_ADD_TC(tp, twobitneg);
85
86	return (atf_no_error());
87}
88