1 /* 2 * Test cases for lib/string_helpers.c module. 3 */ 4 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 5 6 #include <linux/init.h> 7 #include <linux/kernel.h> 8 #include <linux/module.h> 9 #include <linux/random.h> 10 #include <linux/string.h> 11 #include <linux/string_helpers.h> 12 13 struct test_string { 14 const char *in; 15 const char *out; 16 unsigned int flags; 17 }; 18 19 static const struct test_string strings[] __initconst = { 20 { 21 .in = "\\f\\ \\n\\r\\t\\v", 22 .out = "\f\\ \n\r\t\v", 23 .flags = UNESCAPE_SPACE, 24 }, 25 { 26 .in = "\\40\\1\\387\\0064\\05\\040\\8a\\110\\777", 27 .out = " \001\00387\0064\005 \\8aH?7", 28 .flags = UNESCAPE_OCTAL, 29 }, 30 { 31 .in = "\\xv\\xa\\x2c\\xD\\x6f2", 32 .out = "\\xv\n,\ro2", 33 .flags = UNESCAPE_HEX, 34 }, 35 { 36 .in = "\\h\\\\\\\"\\a\\e\\", 37 .out = "\\h\\\"\a\e\\", 38 .flags = UNESCAPE_SPECIAL, 39 }, 40 }; 41 42 static void __init test_string_unescape(unsigned int flags, bool inplace) 43 { 44 char in[256]; 45 char out_test[256]; 46 char out_real[256]; 47 int i, p = 0, q_test = 0, q_real = sizeof(out_real); 48 49 for (i = 0; i < ARRAY_SIZE(strings); i++) { 50 const char *s = strings[i].in; 51 int len = strlen(strings[i].in); 52 53 /* Copy string to in buffer */ 54 memcpy(&in[p], s, len); 55 p += len; 56 57 /* Copy expected result for given flags */ 58 if (flags & strings[i].flags) { 59 s = strings[i].out; 60 len = strlen(strings[i].out); 61 } 62 memcpy(&out_test[q_test], s, len); 63 q_test += len; 64 } 65 in[p++] = '\0'; 66 67 /* Call string_unescape and compare result */ 68 if (inplace) { 69 memcpy(out_real, in, p); 70 if (flags == UNESCAPE_ANY) 71 q_real = string_unescape_any_inplace(out_real); 72 else 73 q_real = string_unescape_inplace(out_real, flags); 74 } else if (flags == UNESCAPE_ANY) { 75 q_real = string_unescape_any(in, out_real, q_real); 76 } else { 77 q_real = string_unescape(in, out_real, q_real, flags); 78 } 79 80 if (q_real != q_test || memcmp(out_test, out_real, q_test)) { 81 pr_warn("Test failed: flags = %u\n", flags); 82 print_hex_dump(KERN_WARNING, "Input: ", 83 DUMP_PREFIX_NONE, 16, 1, in, p - 1, true); 84 print_hex_dump(KERN_WARNING, "Expected: ", 85 DUMP_PREFIX_NONE, 16, 1, out_test, q_test, true); 86 print_hex_dump(KERN_WARNING, "Got: ", 87 DUMP_PREFIX_NONE, 16, 1, out_real, q_real, true); 88 } 89 } 90 91 static int __init test_string_helpers_init(void) 92 { 93 unsigned int i; 94 95 pr_info("Running tests...\n"); 96 for (i = 0; i < UNESCAPE_ANY + 1; i++) 97 test_string_unescape(i, false); 98 test_string_unescape(get_random_int() % (UNESCAPE_ANY + 1), true); 99 100 return -EINVAL; 101 } 102 module_init(test_string_helpers_init); 103 MODULE_LICENSE("Dual BSD/GPL"); 104