1 /*-
2 * Copyright (c) 2016 Jilles Tjoelker <jilles@FreeBSD.org>
3 * Copyright (c) 2023 The FreeBSD Foundation
4 * All rights reserved.
5 *
6 * Portions of this software were developed by Robert Clausecker
7 * <fuz@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <assert.h>
32 #include <dlfcn.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36
37 #include <atf-c.h>
38
39 #ifndef MEMCMP
40 #define MEMCMP memcmp
41 #endif
42
43 /*
44 * On FreeBSD we demand that memcmp returns the difference between the
45 * characters at the first site of mismatch. However, ISO/IEC 9899:1990
46 * only specifies that a number greater than, equal to, or less than
47 * zero shall be returned. If a unit test for this less strict
48 * behaviour is desired, define RES(x) to be (((x) > 0) - ((x) < 0)).
49 */
50 #ifndef RES
51 #define RES(x) (x)
52 #endif
53
54 static int (*memcmp_fn)(const void *, const void *, size_t);
55
56 static void
check_memcmp(const char * a,const char * b,size_t len,int expected)57 check_memcmp(const char *a, const char *b, size_t len, int expected)
58 {
59 int got;
60
61 got = memcmp_fn(a, b, len);
62 ATF_CHECK_EQ_MSG(RES(expected), RES(got),
63 "%s(%p, %p, %zu) gave %d, but wanted %d",
64 __XSTRING(MEMCMP), a, b, len, got, expected);
65 }
66
67 ATF_TC_WITHOUT_HEAD(zero);
ATF_TC_BODY(zero,tc)68 ATF_TC_BODY(zero, tc)
69 {
70
71 check_memcmp("a", "b", 0, 0);
72 check_memcmp("", "", 0, 0);
73 }
74
75 ATF_TC_WITHOUT_HEAD(eq);
ATF_TC_BODY(eq,tc)76 ATF_TC_BODY(eq, tc)
77 {
78 unsigned char data1[256], data2[256];
79 int i;
80
81 for (i = 0; i < 256; i++)
82 data1[i] = data2[i] = i ^ 0x55;
83 for (i = 1; i < 256; i++)
84 check_memcmp(data1, data2, i, 0);
85 for (i = 1; i < 256; i++)
86 check_memcmp(data1 + i, data2 + i, 256 - i, 0);
87 }
88
89 ATF_TC_WITHOUT_HEAD(neq);
ATF_TC_BODY(neq,tc)90 ATF_TC_BODY(neq, tc)
91 {
92 unsigned char data1[256], data2[256];
93 int i;
94
95 for (i = 0; i < 256; i++) {
96 data1[i] = i;
97 data2[i] = i ^ 0x55;
98 }
99 for (i = 1; i < 256; i++)
100 check_memcmp(data1, data2, i, -0x55);
101 for (i = 1; i < 256; i++)
102 check_memcmp(data1 + i, data2 + i, 256 - i, i - (i ^ 0x55));
103 }
104
105 ATF_TC_WITHOUT_HEAD(diff);
ATF_TC_BODY(diff,tc)106 ATF_TC_BODY(diff, tc)
107 {
108 unsigned char data1[256], data2[256];
109 int i;
110
111 memset(data1, 'a', sizeof(data1));
112 memset(data2, 'a', sizeof(data2));
113 data1[128] = 255;
114 data2[128] = 0;
115 for (i = 1; i < 66; i++) {
116 check_memcmp(data1 + 128, data2 + 128, i, 255);
117 check_memcmp(data2 + 128, data1 + 128, i, -255);
118 check_memcmp(data1 + 129 - i, data2 + 129 - i, i, 255);
119 check_memcmp(data2 + 129 - i, data1 + 129 - i, i, -255);
120 check_memcmp(data1 + 129 - i, data2 + 129 - i, i * 2, 255);
121 check_memcmp(data2 + 129 - i, data1 + 129 - i, i * 2, -255);
122 }
123 data1[128] = 'c';
124 data2[128] = 'e';
125 for (i = 1; i < 66; i++) {
126 check_memcmp(data1 + 128, data2 + 128, i, -2);
127 check_memcmp(data2 + 128, data1 + 128, i, 2);
128 check_memcmp(data1 + 129 - i, data2 + 129 - i, i, -2);
129 check_memcmp(data2 + 129 - i, data1 + 129 - i, i, 2);
130 check_memcmp(data1 + 129 - i, data2 + 129 - i, i * 2, -2);
131 check_memcmp(data2 + 129 - i, data1 + 129 - i, i * 2, 2);
132 }
133 memset(data1 + 129, 'A', sizeof(data1) - 129);
134 memset(data2 + 129, 'Z', sizeof(data2) - 129);
135 for (i = 1; i < 66; i++) {
136 check_memcmp(data1 + 128, data2 + 128, i, -2);
137 check_memcmp(data2 + 128, data1 + 128, i, 2);
138 check_memcmp(data1 + 129 - i, data2 + 129 - i, i, -2);
139 check_memcmp(data2 + 129 - i, data1 + 129 - i, i, 2);
140 check_memcmp(data1 + 129 - i, data2 + 129 - i, i * 2, -2);
141 check_memcmp(data2 + 129 - i, data1 + 129 - i, i * 2, 2);
142 }
143 }
144
ATF_TP_ADD_TCS(tp)145 ATF_TP_ADD_TCS(tp)
146 {
147 void *dl_handle;
148
149 dl_handle = dlopen(NULL, RTLD_LAZY);
150 memcmp_fn = dlsym(dl_handle, "test_" __XSTRING(MEMCMP));
151 if (memcmp_fn == NULL)
152 memcmp_fn = MEMCMP;
153
154 ATF_TP_ADD_TC(tp, zero);
155 ATF_TP_ADD_TC(tp, eq);
156 ATF_TP_ADD_TC(tp, neq);
157 ATF_TP_ADD_TC(tp, diff);
158
159 return (atf_no_error());
160 }
161