/* * Test cases for lib/string_helpers.c module. */#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/init.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/random.h>#include <linux/string.h>#include <linux/string_helpers.h> struct test_string {	const char *in;	const char *out;	unsigned int flags;}; static const struct test_string strings[] __initconst = {	{		.in = "\\f\\ \\n\\r\\t\\v",		.out = "\f\\ \n\r\t\v",		.flags = UNESCAPE_SPACE,	},	{		.in = "\\40\\1\\387\\0064\\05\\040\\8a\\110\\777",		.out = " \001\00387\0064\005 \\8aH?7",		.flags = UNESCAPE_OCTAL,	},	{		.in = "\\xv\\xa\\x2c\\xD\\x6f2",		.out = "\\xv\n,\ro2",		.flags = UNESCAPE_HEX,	},	{		.in = "\\h\\\\\\\"\\a\\e\\",		.out = "\\h\\\"\a\e\\",		.flags = UNESCAPE_SPECIAL,	},}; static void __init test_string_unescape(unsigned int flags, bool inplace){	char in[256];	char out_test[256];	char out_real[256];	int i, p = 0, q_test = 0, q_real = sizeof(out_real); 	for (i = 0; i < ARRAY_SIZE(strings); i++) {		const char *s = strings[i].in;		int len = strlen(strings[i].in); 		/* Copy string to in buffer */		memcpy(&in[p], s, len);		p += len; 		/* Copy expected result for given flags */		if (flags & strings[i].flags) {			s = strings[i].out;			len = strlen(strings[i].out);		}		memcpy(&out_test[q_test], s, len);		q_test += len;	}	in[p++] = '\0'; 	/* Call string_unescape and compare result */	if (inplace) {		memcpy(out_real, in, p);		if (flags == UNESCAPE_ANY)			q_real = string_unescape_any_inplace(out_real);		else			q_real = string_unescape_inplace(out_real, flags);	} else if (flags == UNESCAPE_ANY) {		q_real = string_unescape_any(in, out_real, q_real);	} else {		q_real = string_unescape(in, out_real, q_real, flags);	} 	if (q_real != q_test || memcmp(out_test, out_real, q_test)) {		pr_warn("Test failed: flags = %u\n", flags);		print_hex_dump(KERN_WARNING, "Input: ",			       DUMP_PREFIX_NONE, 16, 1, in, p - 1, true);		print_hex_dump(KERN_WARNING, "Expected: ",			       DUMP_PREFIX_NONE, 16, 1, out_test, q_test, true);		print_hex_dump(KERN_WARNING, "Got: ",			       DUMP_PREFIX_NONE, 16, 1, out_real, q_real, true);	}} static int __init test_string_helpers_init(void){	unsigned int i; 	pr_info("Running tests...\n");	for (i = 0; i < UNESCAPE_ANY + 1; i++)		test_string_unescape(i, false);	test_string_unescape(get_random_int() % (UNESCAPE_ANY + 1), true); 	return -EINVAL;}module_init(test_string_helpers_init);MODULE_LICENSE("Dual BSD/GPL");