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 <sys/cdefs.h> 32 #include <assert.h> 33 #include <dlfcn.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 38 #include <atf-c.h> 39 40 #ifndef MEMCMP 41 #define MEMCMP memcmp 42 #endif 43 44 /* 45 * On FreeBSD we demand that memcmp returns the difference between the 46 * characters at the first site of mismatch. However, ISO/IEC 9899:1990 47 * only specifies that a number greater than, equal to, or less than 48 * zero shall be returned. If a unit test for this less strict 49 * behaviour is desired, define RES(x) to be (((x) > 0) - ((x) < 0)). 50 */ 51 #ifndef RES 52 #define RES(x) (x) 53 #endif 54 55 static int (*memcmp_fn)(const void *, const void *, size_t); 56 57 static void 58 check_memcmp(const char *a, const char *b, size_t len, int expected) 59 { 60 int got; 61 62 got = memcmp_fn(a, b, len); 63 ATF_CHECK_EQ_MSG(RES(expected), RES(got), 64 "%s(%p, %p, %zu) gave %d, but wanted %d", 65 __XSTRING(MEMCMP), a, b, len, got, expected); 66 } 67 68 ATF_TC_WITHOUT_HEAD(zero); 69 ATF_TC_BODY(zero, tc) 70 { 71 72 check_memcmp("a", "b", 0, 0); 73 check_memcmp("", "", 0, 0); 74 } 75 76 ATF_TC_WITHOUT_HEAD(eq); 77 ATF_TC_BODY(eq, tc) 78 { 79 unsigned char data1[256], data2[256]; 80 int i; 81 82 for (i = 0; i < 256; i++) 83 data1[i] = data2[i] = i ^ 0x55; 84 for (i = 1; i < 256; i++) 85 check_memcmp(data1, data2, i, 0); 86 for (i = 1; i < 256; i++) 87 check_memcmp(data1 + i, data2 + i, 256 - i, 0); 88 } 89 90 ATF_TC_WITHOUT_HEAD(neq); 91 ATF_TC_BODY(neq, tc) 92 { 93 unsigned char data1[256], data2[256]; 94 int i; 95 96 for (i = 0; i < 256; i++) { 97 data1[i] = i; 98 data2[i] = i ^ 0x55; 99 } 100 for (i = 1; i < 256; i++) 101 check_memcmp(data1, data2, i, -0x55); 102 for (i = 1; i < 256; i++) 103 check_memcmp(data1 + i, data2 + i, 256 - i, i - (i ^ 0x55)); 104 } 105 106 ATF_TC_WITHOUT_HEAD(diff); 107 ATF_TC_BODY(diff, tc) 108 { 109 unsigned char data1[256], data2[256]; 110 int i; 111 112 memset(data1, 'a', sizeof(data1)); 113 memset(data2, 'a', sizeof(data2)); 114 data1[128] = 255; 115 data2[128] = 0; 116 for (i = 1; i < 66; i++) { 117 check_memcmp(data1 + 128, data2 + 128, i, 255); 118 check_memcmp(data2 + 128, data1 + 128, i, -255); 119 check_memcmp(data1 + 129 - i, data2 + 129 - i, i, 255); 120 check_memcmp(data2 + 129 - i, data1 + 129 - i, i, -255); 121 check_memcmp(data1 + 129 - i, data2 + 129 - i, i * 2, 255); 122 check_memcmp(data2 + 129 - i, data1 + 129 - i, i * 2, -255); 123 } 124 data1[128] = 'c'; 125 data2[128] = 'e'; 126 for (i = 1; i < 66; i++) { 127 check_memcmp(data1 + 128, data2 + 128, i, -2); 128 check_memcmp(data2 + 128, data1 + 128, i, 2); 129 check_memcmp(data1 + 129 - i, data2 + 129 - i, i, -2); 130 check_memcmp(data2 + 129 - i, data1 + 129 - i, i, 2); 131 check_memcmp(data1 + 129 - i, data2 + 129 - i, i * 2, -2); 132 check_memcmp(data2 + 129 - i, data1 + 129 - i, i * 2, 2); 133 } 134 memset(data1 + 129, 'A', sizeof(data1) - 129); 135 memset(data2 + 129, 'Z', sizeof(data2) - 129); 136 for (i = 1; i < 66; i++) { 137 check_memcmp(data1 + 128, data2 + 128, i, -2); 138 check_memcmp(data2 + 128, data1 + 128, i, 2); 139 check_memcmp(data1 + 129 - i, data2 + 129 - i, i, -2); 140 check_memcmp(data2 + 129 - i, data1 + 129 - i, i, 2); 141 check_memcmp(data1 + 129 - i, data2 + 129 - i, i * 2, -2); 142 check_memcmp(data2 + 129 - i, data1 + 129 - i, i * 2, 2); 143 } 144 } 145 146 ATF_TP_ADD_TCS(tp) 147 { 148 void *dl_handle; 149 150 dl_handle = dlopen(NULL, RTLD_LAZY); 151 memcmp_fn = dlsym(dl_handle, "test_" __XSTRING(MEMCMP)); 152 if (memcmp_fn == NULL) 153 memcmp_fn = MEMCMP; 154 155 ATF_TP_ADD_TC(tp, zero); 156 ATF_TP_ADD_TC(tp, eq); 157 ATF_TP_ADD_TC(tp, neq); 158 ATF_TP_ADD_TC(tp, diff); 159 160 return (atf_no_error()); 161 } 162