1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/module.h>
3 #include <linux/printk.h>
4 #include <linux/slab.h>
5 #include <linux/string.h>
7 static __init int memset16_selftest(void)
12 p = kmalloc(256 * 2 * 2, GFP_KERNEL);
16 for (i = 0; i < 256; i++) {
17 for (j = 0; j < 256; j++) {
18 memset(p, 0xa1, 256 * 2 * sizeof(v));
19 memset16(p + i, 0xb1b2, j);
20 for (k = 0; k < 512; k++) {
25 } else if (k < i + j) {
39 return (i << 24) | (j << 16) | k | 0x8000;
43 static __init int memset32_selftest(void)
48 p = kmalloc(256 * 2 * 4, GFP_KERNEL);
52 for (i = 0; i < 256; i++) {
53 for (j = 0; j < 256; j++) {
54 memset(p, 0xa1, 256 * 2 * sizeof(v));
55 memset32(p + i, 0xb1b2b3b4, j);
56 for (k = 0; k < 512; k++) {
61 } else if (k < i + j) {
75 return (i << 24) | (j << 16) | k | 0x8000;
79 static __init int memset64_selftest(void)
84 p = kmalloc(256 * 2 * 8, GFP_KERNEL);
88 for (i = 0; i < 256; i++) {
89 for (j = 0; j < 256; j++) {
90 memset(p, 0xa1, 256 * 2 * sizeof(v));
91 memset64(p + i, 0xb1b2b3b4b5b6b7b8ULL, j);
92 for (k = 0; k < 512; k++) {
95 if (v != 0xa1a1a1a1a1a1a1a1ULL)
97 } else if (k < i + j) {
98 if (v != 0xb1b2b3b4b5b6b7b8ULL)
101 if (v != 0xa1a1a1a1a1a1a1a1ULL)
111 return (i << 24) | (j << 16) | k | 0x8000;
115 static __init int strchr_selftest(void)
117 const char *test_string = "abcdefghijkl";
118 const char *empty_string = "";
122 for (i = 0; i < strlen(test_string) + 1; i++) {
123 result = strchr(test_string, test_string[i]);
124 if (result - test_string != i)
128 result = strchr(empty_string, '\0');
129 if (result != empty_string)
132 result = strchr(empty_string, 'a');
136 result = strchr(test_string, 'z');
143 static __init int strnchr_selftest(void)
145 const char *test_string = "abcdefghijkl";
146 const char *empty_string = "";
150 for (i = 0; i < strlen(test_string) + 1; i++) {
151 for (j = 0; j < strlen(test_string) + 2; j++) {
152 result = strnchr(test_string, j, test_string[i]);
156 return ((i + 'a') << 8) | j;
158 if (result - test_string != i)
159 return ((i + 'a') << 8) | j;
163 result = strnchr(empty_string, 0, '\0');
167 result = strnchr(empty_string, 1, '\0');
168 if (result != empty_string)
171 result = strnchr(empty_string, 1, 'a');
175 result = strnchr(NULL, 0, '\0');
182 static __init int strspn_selftest(void)
184 static const struct strspn_test {
186 const char accept[16];
187 const char reject[16];
190 } tests[] __initconst = {
191 { "foobar", "", "", 0, 6 },
192 { "abba", "abc", "ABBA", 4, 4 },
193 { "abba", "a", "b", 1, 1 },
194 { "", "abc", "abc", 0, 0},
196 const struct strspn_test *s = tests;
199 for (i = 0; i < ARRAY_SIZE(tests); ++i, ++s) {
200 res = strspn(s->str, s->accept);
203 res = strcspn(s->str, s->reject);
205 return 0x100 + 2*i + 1;
210 static __exit void string_selftest_remove(void)
214 static __init int string_selftest_init(void)
219 subtest = memset16_selftest();
224 subtest = memset32_selftest();
229 subtest = memset64_selftest();
234 subtest = strchr_selftest();
239 subtest = strnchr_selftest();
244 subtest = strspn_selftest();
248 pr_info("String selftests succeeded\n");
251 pr_crit("String selftest failure %d.%08x\n", test, subtest);
255 module_init(string_selftest_init);
256 module_exit(string_selftest_remove);
257 MODULE_LICENSE("GPL v2");