| 1 | |
| 2 | * Test cases for lib/string_helpers.c module.
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| 3 |
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| 4 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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| 5 |
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| 6 | #include <linux/init.h>
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| 7 | #include <linux/kernel.h>
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| 8 | #include <linux/module.h>
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| 9 | #include <linux/random.h>
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| 10 | #include <linux/string.h>
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| 11 | #include <linux/string_helpers.h>
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| 12 |
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| 13 | struct test_string {
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| 14 | const char *in;
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| 15 | const char *out;
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| 16 | unsigned int flags;
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| 17 | };
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| 18 |
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| 19 | static const struct test_string strings[] __initconst = {
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| 20 | {
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| 21 | .in = "\\f\\ \\n\\r\\t\\v",
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| 22 | .out = "\f\\ \n\r\t\v",
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| 23 | .flags = UNESCAPE_SPACE,
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| 24 | },
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| 25 | {
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| 26 | .in = "\\40\\1\\387\\0064\\05\\040\\8a\\110\\777",
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| 27 | .out = " \001\00387\0064\005 \\8aH?7",
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| 28 | .flags = UNESCAPE_OCTAL,
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| 29 | },
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| 30 | {
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| 31 | .in = "\\xv\\xa\\x2c\\xD\\x6f2",
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| 32 | .out = "\\xv\n,\ro2",
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| 33 | .flags = UNESCAPE_HEX,
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| 34 | },
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| 35 | {
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| 36 | .in = "\\h\\\\\\\"\\a\\e\\",
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| 37 | .out = "\\h\\\"\a\e\\",
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| 38 | .flags = UNESCAPE_SPECIAL,
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| 39 | },
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| 40 | };
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| 41 |
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| 42 | static void __init test_string_unescape(unsigned int flags, bool inplace)
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| 43 | {
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| 44 | char in[256];
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| 45 | char out_test[256];
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| 46 | char out_real[256];
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| 47 | int i, p = 0, q_test = 0, q_real = sizeof(out_real);
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| 48 |
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| 49 | for (i = 0; i < ARRAY_SIZE(strings); i++) {
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| 50 | const char *s = strings[i].in;
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| 51 | int len = strlen(strings[i].in);
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| 52 |
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| 53 |
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| 54 | memcpy(&in[p], s, len);
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| 55 | p += len;
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| 56 |
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| 57 |
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| 58 | if (flags & strings[i].flags) {
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| 59 | s = strings[i].out;
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| 60 | len = strlen(strings[i].out);
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| 61 | }
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| 62 | memcpy(&out_test[q_test], s, len);
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| 63 | q_test += len;
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| 64 | }
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| 65 | in[p++] = '\0';
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| 66 |
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| 67 |
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| 68 | if (inplace) {
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| 69 | memcpy(out_real, in, p);
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| 70 | if (flags == UNESCAPE_ANY)
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| 71 | q_real = string_unescape_any_inplace(out_real);
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| 72 | else
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| 73 | q_real = string_unescape_inplace(out_real, flags);
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| 74 | } else if (flags == UNESCAPE_ANY) {
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| 75 | q_real = string_unescape_any(in, out_real, q_real);
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| 76 | } else {
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| 77 | q_real = string_unescape(in, out_real, q_real, flags);
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| 78 | }
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| 79 |
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| 80 | if (q_real != q_test || memcmp(out_test, out_real, q_test)) {
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| 81 | pr_warn("Test failed: flags = %u\n", flags);
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| 82 | print_hex_dump(KERN_WARNING, "Input: ",
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| 83 | DUMP_PREFIX_NONE, 16, 1, in, p - 1, true);
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| 84 | print_hex_dump(KERN_WARNING, "Expected: ",
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| 85 | DUMP_PREFIX_NONE, 16, 1, out_test, q_test, true);
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| 86 | print_hex_dump(KERN_WARNING, "Got: ",
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| 87 | DUMP_PREFIX_NONE, 16, 1, out_real, q_real, true);
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| 88 | }
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| 89 | }
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| 90 |
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| 91 | static int __init test_string_helpers_init(void)
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| 92 | {
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| 93 | unsigned int i;
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| 94 |
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| 95 | pr_info("Running tests...\n");
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| 96 | for (i = 0; i < UNESCAPE_ANY + 1; i++)
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| 97 | test_string_unescape(i, false);
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| 98 | test_string_unescape(get_random_int() % (UNESCAPE_ANY + 1), true);
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| 99 |
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| 100 | return -EINVAL;
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| 101 | }
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| 102 | module_init(test_string_helpers_init);
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| 103 | MODULE_LICENSE("Dual BSD/GPL");
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