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
alignment_testcase(char * a,char * b,int want,size_t len)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
check_strncmp_alignments(char a[],char b[],size_t a_off,size_t b_off,size_t len,size_t pos)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);
ATF_TC_HEAD(strncmp_alignments,tc)119 ATF_TC_HEAD(strncmp_alignments, tc)
120 {
121 atf_tc_set_md_var(tc, "descr", "Test strncmp(3) with various alignments");
122 }
123
ATF_TC_BODY(strncmp_alignments,tc)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);
ATF_TC_HEAD(strncmp_null,tc)142 ATF_TC_HEAD(strncmp_null, tc)
143 {
144 atf_tc_set_md_var(tc, "descr", "Test strncmp(3) with null pointers");
145 }
146
ATF_TC_BODY(strncmp_null,tc)147 ATF_TC_BODY(strncmp_null, tc)
148 {
149 alignment_testcase(NULL, NULL, 0, 0);
150 }
151
ATF_TP_ADD_TCS(tp)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