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 FFS
35 # define FFS ffs
36 # define TYPE int
37 # define TYPE_MIN INT_MIN
38 #endif
39
40 ATF_TC_WITHOUT_HEAD(zero);
ATF_TC_BODY(zero,tc)41 ATF_TC_BODY(zero, tc)
42 {
43 ATF_CHECK_EQ((TYPE)0, FFS(0));
44 }
45
46 ATF_TC_WITHOUT_HEAD(twobit);
ATF_TC_BODY(twobit,tc)47 ATF_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(j + 1, FFS(x),
58 "%s(%#jx) == %d != %d", __STRING(FFS), (intmax_t)x, FFS(x), j + 1);
59 }
60 }
61
62 ATF_TC_WITHOUT_HEAD(twobitneg);
ATF_TC_BODY(twobitneg,tc)63 ATF_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(j + 1, FFS(x),
74 "%s(%#jx) == %d != %d", __STRING(FFS), (intmax_t)x, FFS(x), j + 1);
75 }
76 }
77
78
ATF_TP_ADD_TCS(tp)79 ATF_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