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 <sys/cdefs.h> 30 31 #include <atf-c.h> 32 #include <dlfcn.h> 33 #include <string.h> 34 35 int (*volatile strncmp_fn)(const char *, const char *, size_t); 36 37 static void 38 alignment_testcase(char *a, char *b, int want, size_t len) 39 { 40 int res; 41 42 res = strncmp_fn(a, b, len); 43 ATF_CHECK_MSG(want == (res > 0) - (res < 0), 44 "strcmp(%p \"%s\", %p \"%s\", %zu) = %d != %d", 45 (void *)a, a, (void *)b, b, len, res, want); 46 } 47 48 static void 49 check_strncmp_alignments(char a[], char b[], 50 size_t a_off, size_t b_off, size_t len, size_t pos) 51 { 52 char *a_str, *b_str, a_orig, b_orig; 53 54 a[a_off] = '\0'; 55 b[b_off] = '\0'; 56 57 a_str = a + a_off + 1; 58 b_str = b + b_off + 1; 59 60 a_str[len] = '\0'; 61 b_str[len] = '\0'; 62 a_str[len+1] = 'A'; 63 b_str[len+1] = 'B'; 64 65 a_orig = a_str[pos]; 66 b_orig = b_str[pos]; 67 68 alignment_testcase(a_str, b_str, 0, len + 16); 69 alignment_testcase(a_str, b_str, 0, len + 1); 70 alignment_testcase(a_str, b_str, 0, len); 71 72 if (pos < len) { 73 a_str[pos] = '\0'; 74 alignment_testcase(a_str, b_str, -1, len + 16); 75 alignment_testcase(a_str, b_str, -1, len + 1); 76 alignment_testcase(a_str, b_str, -1, len); 77 alignment_testcase(a_str, b_str, -1, pos + 1); 78 alignment_testcase(a_str, b_str, 0, pos); 79 a_str[pos] = a_orig; 80 81 b_str[pos] = '\0'; 82 alignment_testcase(a_str, b_str, 1, len + 16); 83 alignment_testcase(a_str, b_str, 1, len + 1); 84 alignment_testcase(a_str, b_str, 1, len); 85 alignment_testcase(a_str, b_str, 1, pos + 1); 86 alignment_testcase(a_str, b_str, 0, pos); 87 b_str[pos] = b_orig; 88 } 89 90 a_str[pos] = 'X'; 91 alignment_testcase(a_str, b_str, 1, len + 16); 92 alignment_testcase(a_str, b_str, 0, pos); 93 alignment_testcase(a_str, b_str, 1, pos + 1); 94 if (pos < len) { 95 alignment_testcase(a_str, b_str, 1, len); 96 alignment_testcase(a_str, b_str, 1, len + 1); 97 } 98 a_str[pos] = a_orig; 99 100 b_str[pos] = 'X'; 101 alignment_testcase(a_str, b_str, -1, len + 16); 102 alignment_testcase(a_str, b_str, 0, pos); 103 alignment_testcase(a_str, b_str, -1, pos + 1); 104 if (pos < len) { 105 alignment_testcase(a_str, b_str, -1, len); 106 alignment_testcase(a_str, b_str, -1, len + 1); 107 } 108 b_str[pos] = b_orig; 109 110 a[a_off] = '-'; 111 b[b_off] = '-'; 112 a_str[len] = '-'; 113 b_str[len] = '-'; 114 a_str[len+1] = '-'; 115 b_str[len+1] = '-'; 116 } 117 118 ATF_TC(strncmp_alignments); 119 ATF_TC_HEAD(strncmp_alignments, tc) 120 { 121 atf_tc_set_md_var(tc, "descr", "Test strncmp(3) with various alignments"); 122 } 123 124 ATF_TC_BODY(strncmp_alignments, tc) 125 { 126 size_t a_off, b_off, len, pos; 127 char a[64+16+16+3], b[64+16+16+3]; 128 129 memset(a, '-', sizeof(a)); 130 memset(b, '-', sizeof(b)); 131 a[sizeof(a) - 1] = '\0'; 132 b[sizeof(b) - 1] = '\0'; 133 134 for (a_off = 0; a_off < 16; a_off++) 135 for (b_off = 0; b_off < 16; b_off++) 136 for (len = 1; len <= 64; len++) 137 for (pos = 0; pos <= len; pos++) 138 check_strncmp_alignments(a, b, a_off, b_off, len, pos); 139 } 140 141 ATF_TC(strncmp_null); 142 ATF_TC_HEAD(strncmp_null, tc) 143 { 144 atf_tc_set_md_var(tc, "descr", "Test strncmp(3) with null pointers"); 145 } 146 147 ATF_TC_BODY(strncmp_null, tc) 148 { 149 alignment_testcase(NULL, NULL, 0, 0); 150 } 151 152 ATF_TP_ADD_TCS(tp) 153 { 154 void *dl_handle; 155 156 dl_handle = dlopen(NULL, RTLD_LAZY); 157 strncmp_fn = dlsym(dl_handle, "test_strncmp"); 158 if (strncmp_fn == NULL) 159 strncmp_fn = strncmp; 160 161 ATF_TP_ADD_TC(tp, strncmp_alignments); 162 ATF_TP_ADD_TC(tp, strncmp_null); 163 164 return atf_no_error(); 165 } 166