1 /* Test strndup functions.
2 Copyright (C) 2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <support/check.h>
20
21 #define TEST_MAIN
22 #include "test-string.h"
23
24 static void
25 do_one_test (const char *src, size_t len, size_t n)
26 {
27 char *dst = strndup (src, n);
28 size_t s = (len > n ? n: len) * sizeof (char);
29
30 TEST_COMPARE_BLOB (dst, s, src, s);
31
32 free (dst);
33 }
34
35 static void
36 do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char)
37 {
38 size_t i;
39 char *s1;
40
41 align1 &= 7;
42 if ((align1 + len) * sizeof (char) >= page_size)
43 return;
44
45 align2 &= 7;
46 if ((align2 + len) * sizeof (char) >= page_size)
47 return;
48
49 s1 = (char *) (buf1) + align1;
50
51 for (i = 0; i < len; ++i)
52 s1[i] = 32 + 23 * i % (max_char - 32);
53 s1[len] = 0;
54 for (i = len + 1; (i + align1) * sizeof (char) < page_size && i < len + 64;
55 ++i)
56 s1[i] = 32 + 32 * i % (max_char - 32);
57
58 do_one_test (s1, len, n);
59 }
60
61 static void
62 do_page_tests (void)
63 {
64 char *s1;
65 const size_t maxoffset = 64;
66
67 /* Put s1 at the maxoffset from the edge of buf1's last page. */
68 s1 = (char *) buf1 + BUF1PAGES * page_size / sizeof (char) - maxoffset;
69
70 memset (s1, 'a', maxoffset - 1);
71 s1[maxoffset - 1] = '\0';
72
73 /* Both strings are bounded to a page with read/write access and the next
74 page is protected with PROT_NONE (meaning that any access outside of the
75 page regions will trigger an invalid memory access).
76
77 The loop copies the string s1 for all possible offsets up to maxoffset
78 for both inputs with a size larger than s1 (so memory access outside the
79 expected memory regions might trigger invalid access). */
80
81 for (size_t off1 = 0; off1 < maxoffset; off1++)
82 for (size_t off2 = 0; off2 < maxoffset; off2++)
83 do_one_test (s1 + off1, maxoffset - off1 - 1,
84 maxoffset + (maxoffset - off2));
85 }
86
87 static void
88 do_random_tests (void)
89 {
90 size_t i, j, n, align1, align2, len, size, mode;
91 char *p1 = (char *) (buf1 + page_size) - 512;
92 char *res;
93
94 for (n = 0; n < ITERATIONS; n++)
95 {
96 mode = random ();
97 if (mode & 1)
98 {
99 size = random () & 255;
100 align1 = 512 - size - (random () & 15);
101 if (mode & 2)
102 align2 = align1 - (random () & 24);
103 else
104 align2 = align1 - (random () & 31);
105 if (mode & 4)
106 {
107 j = align1;
108 align1 = align2;
109 align2 = j;
110 }
111 if (mode & 8)
112 len = size - (random () & 31);
113 else
114 len = 512;
115 if (len >= 512)
116 len = random () & 511;
117 }
118 else
119 {
120 align1 = random () & 31;
121 if (mode & 2)
122 align2 = random () & 31;
123 else
124 align2 = align1 + (random () & 24);
125 len = random () & 511;
126 j = align1;
127 if (align2 > j)
128 j = align2;
129 if (mode & 4)
130 {
131 size = random () & 511;
132 if (size + j > 512)
133 size = 512 - j - (random () & 31);
134 }
135 else
136 size = 512 - j;
137 if ((mode & 8) && len + j >= 512)
138 len = 512 - j - (random () & 7);
139 }
140 j = len + align1 + 64;
141 if (j > 512)
142 j = 512;
143 for (i = 0; i < j; i++)
144 {
145 if (i == len + align1)
146 p1[i] = 0;
147 else
148 {
149 p1[i] = random () & CHAR_MAX;
150 if (i >= align1 && i < len + align1 && !p1[i])
151 p1[i] = (random () & 127) + 3;
152 }
153 }
154
155 res = (char *) strndup ((char *) (p1 + align1), size);
156 j = len + 1;
157 if (size < j)
158 j = size;
159 TEST_COMPARE_BLOB (res, j, (char *) (p1 + align1), j);
160 free (res);
161 }
162 }
163
164 int
165 test_main (void)
166 {
167 size_t i;
168
169 test_init ();
170
171 printf ("%28s", "");
172 printf ("\t%s", "strndup");
173 putchar ('\n');
174
175 for (i = 1; i < 8; ++i)
176 {
177 do_test (i, i, 16, 16, 127);
178 do_test (i, i, 16, 16, CHAR_MAX);
179 do_test (i, 2 * i, 16, 16, 127);
180 do_test (2 * i, i, 16, 16, CHAR_MAX);
181 do_test (8 - i, 2 * i, 1 << i, 2 << i, 127);
182 do_test (2 * i, 8 - i, 2 << i, 1 << i, 127);
183 do_test (8 - i, 2 * i, 1 << i, 2 << i, CHAR_MAX);
184 do_test (2 * i, 8 - i, 2 << i, 1 << i, CHAR_MAX);
185 }
186
187 for (i = 1; i < 8; ++i)
188 {
189 do_test (0, 0, 4 << i, 8 << i, 127);
190 do_test (0, 0, 16 << i, 8 << i, 127);
191 do_test (8 - i, 2 * i, 4 << i, 8 << i, 127);
192 do_test (8 - i, 2 * i, 16 << i, 8 << i, 127);
193 }
194
195 do_random_tests ();
196 do_page_tests ();
197 return ret;
198 }
199
200 #include <support/test-driver.c>