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 strcmp_fn)(const char *, const char *); 36 37 ATF_TC(strcmp_alignments); 38 ATF_TC_HEAD(strcmp_alignments, tc) 39 { 40 atf_tc_set_md_var(tc, "descr", "Test strcmp(3) with various alignments"); 41 } 42 43 static void 44 alignment_testcase(char *a, char *b, int want) 45 { 46 int res; 47 48 res = strcmp_fn(a, b); 49 ATF_CHECK_MSG(want == (res > 0) - (res < 0), 50 "strcmp(%p \"%s\", %p \"%s\") = %d != %d", 51 (void *)a, a, (void *)b, b, res, want); 52 } 53 54 static void 55 check_strcmp_alignments(char a[], char b[], 56 size_t a_off, size_t b_off, size_t len, size_t pos) 57 { 58 char *a_str, *b_str, a_orig, b_orig; 59 60 a[a_off] = '\0'; 61 b[b_off] = '\0'; 62 63 a_str = a + a_off + 1; 64 b_str = b + b_off + 1; 65 66 a_str[len] = '\0'; 67 b_str[len] = '\0'; 68 a_str[len+1] = 'A'; 69 b_str[len+1] = 'B'; 70 71 a_orig = a_str[pos]; 72 b_orig = b_str[pos]; 73 74 alignment_testcase(a_str, b_str, 0); 75 76 if (pos < len) { 77 a_str[pos] = '\0'; 78 alignment_testcase(a_str, b_str, -1); 79 a_str[pos] = a_orig; 80 b_str[pos] = '\0'; 81 alignment_testcase(a_str, b_str, 1); 82 b_str[pos] = b_orig; 83 } 84 85 a_str[pos] = 'X'; 86 alignment_testcase(a_str, b_str, 1); 87 a_str[pos] = a_orig; 88 b_str[pos] = 'X'; 89 alignment_testcase(a_str, b_str, -1); 90 b_str[pos] = b_orig; 91 92 a[a_off] = '-'; 93 b[b_off] = '-'; 94 a_str[len] = '-'; 95 b_str[len] = '-'; 96 a_str[len+1] = '-'; 97 b_str[len+1] = '-'; 98 } 99 100 ATF_TC_BODY(strcmp_alignments, tc) 101 { 102 size_t a_off, b_off, len, pos; 103 /* 16B alignment offset + 64B buffer + sentinel before/after + NUL */ 104 char a[64+16+3], b[64+16+3]; 105 106 memset(a, '-', sizeof(a)); 107 memset(b, '-', sizeof(b)); 108 a[sizeof(a) - 1] = '\0'; 109 b[sizeof(b) - 1] = '\0'; 110 111 /* check alignment offsets relevant for SSE routines */ 112 for (a_off = 0; a_off < 16; a_off++) 113 for (b_off = 0; b_off < 16; b_off++) 114 /* ensure main loop (@ 32B) is completed at least once */ 115 for (len = 1; len <= 64; len++) 116 for (pos = 0; pos <= len; pos++) 117 check_strcmp_alignments(a, b, a_off, b_off, len, pos); 118 } 119 120 ATF_TP_ADD_TCS(tp) 121 { 122 void *dl_handle; 123 124 dl_handle = dlopen(NULL, RTLD_LAZY); 125 strcmp_fn = dlsym(dl_handle, "test_strcmp"); 126 if (strcmp_fn == NULL) 127 strcmp_fn = strcmp; 128 129 ATF_TP_ADD_TC(tp, strcmp_alignments); 130 131 return atf_no_error(); 132 } 133