// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause/* * Test cases for lib/string_helpers.c module. */#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <kunit/test.h>#include <linux/array_size.h>#include <linux/kernel.h>#include <linux/random.h>#include <linux/string.h>#include <linux/string_helpers.h> static void test_string_check_buf(struct kunit *test,				  const char *name, unsigned int flags,				  char *in, size_t p,				  char *out_real, size_t q_real,				  char *out_test, size_t q_test){	KUNIT_ASSERT_EQ_MSG(test, q_real, q_test, "name:%s", name);	KUNIT_EXPECT_MEMEQ_MSG(test, out_test, out_real, q_test,			       "name:%s", name);} struct test_string {	const char *in;	const char *out;	unsigned int flags;}; static const struct test_string strings[] = {	{		.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 test_string_unescape(struct kunit *test,				 const char *name, unsigned int flags,				 bool inplace){	int q_real = 256;	char *in = kunit_kzalloc(test, q_real, GFP_KERNEL);	char *out_test = kunit_kzalloc(test, q_real, GFP_KERNEL);	char *out_real = kunit_kzalloc(test, q_real, GFP_KERNEL);	int i, p = 0, q_test = 0; 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, in);	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, out_test);	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, 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);	} 	test_string_check_buf(test, name, flags, in, p - 1, out_real, q_real,			      out_test, q_test);} struct test_string_1 {	const char *out;	unsigned int flags;}; #define	TEST_STRING_2_MAX_S1		32struct test_string_2 {	const char *in;	struct test_string_1 s1[TEST_STRING_2_MAX_S1];}; #define	TEST_STRING_2_DICT_0		NULLstatic const struct test_string_2 escape0[] = {{	.in = "\f\\ \n\r\t\v",	.s1 = {{		.out = "\\f\\ \\n\\r\\t\\v",		.flags = ESCAPE_SPACE,	},{		.out = "\\f\\134\\040\\n\\r\\t\\v",		.flags = ESCAPE_SPACE | ESCAPE_OCTAL,	},{		.out = "\\f\\x5c\\x20\\n\\r\\t\\v",		.flags = ESCAPE_SPACE | ESCAPE_HEX,	},{		/* terminator */	}}},{	.in = "\\h\\\"\a\e\\",	.s1 = {{		.out = "\\\\h\\\\\\\"\\a\\e\\\\",		.flags = ESCAPE_SPECIAL,	},{		.out = "\\\\\\150\\\\\\\"\\a\\e\\\\",		.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL,	},{		.out = "\\\\\\x68\\\\\\\"\\a\\e\\\\",		.flags = ESCAPE_SPECIAL | ESCAPE_HEX,	},{		/* terminator */	}}},{	.in = "\eb \\C\007\"\x90\r]",	.s1 = {{		.out = "\eb \\C\007\"\x90\\r]",		.flags = ESCAPE_SPACE,	},{		.out = "\\eb \\\\C\\a\\\"\x90\r]",		.flags = ESCAPE_SPECIAL,	},{		.out = "\\eb \\\\C\\a\\\"\x90\\r]",		.flags = ESCAPE_SPACE | ESCAPE_SPECIAL,	},{		.out = "\\033\\142\\040\\134\\103\\007\\042\\220\\015\\135",		.flags = ESCAPE_OCTAL,	},{		.out = "\\033\\142\\040\\134\\103\\007\\042\\220\\r\\135",		.flags = ESCAPE_SPACE | ESCAPE_OCTAL,	},{		.out = "\\e\\142\\040\\\\\\103\\a\\\"\\220\\015\\135",		.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL,	},{		.out = "\\e\\142\\040\\\\\\103\\a\\\"\\220\\r\\135",		.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_OCTAL,	},{		.out = "\eb \\C\007\"\x90\r]",		.flags = ESCAPE_NP,	},{		.out = "\eb \\C\007\"\x90\\r]",		.flags = ESCAPE_SPACE | ESCAPE_NP,	},{		.out = "\\eb \\C\\a\"\x90\r]",		.flags = ESCAPE_SPECIAL | ESCAPE_NP,	},{		.out = "\\eb \\C\\a\"\x90\\r]",		.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_NP,	},{		.out = "\\033b \\C\\007\"\\220\\015]",		.flags = ESCAPE_OCTAL | ESCAPE_NP,	},{		.out = "\\033b \\C\\007\"\\220\\r]",		.flags = ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_NP,	},{		.out = "\\eb \\C\\a\"\\220\\r]",		.flags = ESCAPE_SPECIAL | ESCAPE_SPACE | ESCAPE_OCTAL |			 ESCAPE_NP,	},{		.out = "\\x1bb \\C\\x07\"\\x90\\x0d]",		.flags = ESCAPE_NP | ESCAPE_HEX,	},{		/* terminator */	}}},{	.in = "\007 \eb\"\x90\xCF\r",	.s1 = {{		.out = "\007 \eb\"\\220\\317\r",		.flags = ESCAPE_OCTAL | ESCAPE_NA,	},{		.out = "\007 \eb\"\\x90\\xcf\r",		.flags = ESCAPE_HEX | ESCAPE_NA,	},{		.out = "\007 \eb\"\x90\xCF\r",		.flags = ESCAPE_NA,	},{		/* terminator */	}}},{	/* terminator */}}; #define	TEST_STRING_2_DICT_1		"b\\ \t\r\xCF"static const struct test_string_2 escape1[] = {{	.in = "\f\\ \n\r\t\v",	.s1 = {{		.out = "\f\\134\\040\n\\015\\011\v",		.flags = ESCAPE_OCTAL,	},{		.out = "\f\\x5c\\x20\n\\x0d\\x09\v",		.flags = ESCAPE_HEX,	},{		.out = "\f\\134\\040\n\\015\\011\v",		.flags = ESCAPE_ANY | ESCAPE_APPEND,	},{		.out = "\\014\\134\\040\\012\\015\\011\\013",		.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NAP,	},{		.out = "\\x0c\\x5c\\x20\\x0a\\x0d\\x09\\x0b",		.flags = ESCAPE_HEX | ESCAPE_APPEND | ESCAPE_NAP,	},{		.out = "\f\\134\\040\n\\015\\011\v",		.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NA,	},{		.out = "\f\\x5c\\x20\n\\x0d\\x09\v",		.flags = ESCAPE_HEX | ESCAPE_APPEND | ESCAPE_NA,	},{		/* terminator */	}}},{	.in = "\\h\\\"\a\xCF\e\\",	.s1 = {{		.out = "\\134h\\134\"\a\\317\e\\134",		.flags = ESCAPE_OCTAL,	},{		.out = "\\134h\\134\"\a\\317\e\\134",		.flags = ESCAPE_ANY | ESCAPE_APPEND,	},{		.out = "\\134h\\134\"\\007\\317\\033\\134",		.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NAP,	},{		.out = "\\134h\\134\"\a\\317\e\\134",		.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NA,	},{		/* terminator */	}}},{	.in = "\eb \\C\007\"\x90\r]",	.s1 = {{		.out = "\e\\142\\040\\134C\007\"\x90\\015]",		.flags = ESCAPE_OCTAL,	},{		/* terminator */	}}},{	.in = "\007 \eb\"\x90\xCF\r",	.s1 = {{		.out = "\007 \eb\"\x90\xCF\r",		.flags = ESCAPE_NA,	},{		.out = "\007 \eb\"\x90\xCF\r",		.flags = ESCAPE_SPACE | ESCAPE_NA,	},{		.out = "\007 \eb\"\x90\xCF\r",		.flags = ESCAPE_SPECIAL | ESCAPE_NA,	},{		.out = "\007 \eb\"\x90\xCF\r",		.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_NA,	},{		.out = "\007 \eb\"\x90\\317\r",		.flags = ESCAPE_OCTAL | ESCAPE_NA,	},{		.out = "\007 \eb\"\x90\\317\r",		.flags = ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_NA,	},{		.out = "\007 \eb\"\x90\\317\r",		.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL | ESCAPE_NA,	},{		.out = "\007 \eb\"\x90\\317\r",		.flags = ESCAPE_ANY | ESCAPE_NA,	},{		.out = "\007 \eb\"\x90\\xcf\r",		.flags = ESCAPE_HEX | ESCAPE_NA,	},{		.out = "\007 \eb\"\x90\\xcf\r",		.flags = ESCAPE_SPACE | ESCAPE_HEX | ESCAPE_NA,	},{		.out = "\007 \eb\"\x90\\xcf\r",		.flags = ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NA,	},{		.out = "\007 \eb\"\x90\\xcf\r",		.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NA,	},{		/* terminator */	}}},{	.in = "\007 \eb\"\x90\xCF\r",	.s1 = {{		.out = "\007 \eb\"\x90\xCF\r",		.flags = ESCAPE_NAP,	},{		.out = "\007 \eb\"\x90\xCF\\r",		.flags = ESCAPE_SPACE | ESCAPE_NAP,	},{		.out = "\007 \eb\"\x90\xCF\r",		.flags = ESCAPE_SPECIAL | ESCAPE_NAP,	},{		.out = "\007 \eb\"\x90\xCF\\r",		.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_NAP,	},{		.out = "\007 \eb\"\x90\\317\\015",		.flags = ESCAPE_OCTAL | ESCAPE_NAP,	},{		.out = "\007 \eb\"\x90\\317\\r",		.flags = ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_NAP,	},{		.out = "\007 \eb\"\x90\\317\\015",		.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL | ESCAPE_NAP,	},{		.out = "\007 \eb\"\x90\\317\r",		.flags = ESCAPE_ANY | ESCAPE_NAP,	},{		.out = "\007 \eb\"\x90\\xcf\\x0d",		.flags = ESCAPE_HEX | ESCAPE_NAP,	},{		.out = "\007 \eb\"\x90\\xcf\\r",		.flags = ESCAPE_SPACE | ESCAPE_HEX | ESCAPE_NAP,	},{		.out = "\007 \eb\"\x90\\xcf\\x0d",		.flags = ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NAP,	},{		.out = "\007 \eb\"\x90\\xcf\\r",		.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NAP,	},{		/* terminator */	}}},{	/* terminator */}}; static const struct test_string strings_upper[] = {	{		.in = "abcdefgh1234567890test",		.out = "ABCDEFGH1234567890TEST",	},	{		.in = "abCdeFgH1234567890TesT",		.out = "ABCDEFGH1234567890TEST",	},}; static const struct test_string strings_lower[] = {	{		.in = "ABCDEFGH1234567890TEST",		.out = "abcdefgh1234567890test",	},	{		.in = "abCdeFgH1234567890TesT",		.out = "abcdefgh1234567890test",	},}; static const char *test_string_find_match(const struct test_string_2 *s2,					  unsigned int flags){	const struct test_string_1 *s1 = s2->s1;	unsigned int i; 	if (!flags)		return s2->in; 	/* Test cases are NULL-aware */	flags &= ~ESCAPE_NULL; 	/* ESCAPE_OCTAL has a higher priority */	if (flags & ESCAPE_OCTAL)		flags &= ~ESCAPE_HEX; 	for (i = 0; i < TEST_STRING_2_MAX_S1 && s1->out; i++, s1++)		if (s1->flags == flags)			return s1->out;	return NULL;} static voidtest_string_escape_overflow(struct kunit *test,			    const char *in, int p, unsigned int flags, const char *esc,			    int q_test, const char *name){	int q_real; 	q_real = string_escape_mem(in, p, NULL, 0, flags, esc);	KUNIT_EXPECT_EQ_MSG(test, q_real, q_test, "name:%s: flags:%#x", name, flags);} static void test_string_escape(struct kunit *test, const char *name,			       const struct test_string_2 *s2,			       unsigned int flags, const char *esc){	size_t out_size = 512;	char *out_test = kunit_kzalloc(test, out_size, GFP_KERNEL);	char *out_real = kunit_kzalloc(test, out_size, GFP_KERNEL);	char *in = kunit_kzalloc(test, 256, GFP_KERNEL);	int p = 0, q_test = 0;	int q_real; 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, out_test);	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, out_real);	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, in); 	for (; s2->in; s2++) {		const char *out;		int len; 		/* NULL injection */		if (flags & ESCAPE_NULL) {			in[p++] = '\0';			/* '\0' passes isascii() test */			if (flags & ESCAPE_NA && !(flags & ESCAPE_APPEND && esc)) {				out_test[q_test++] = '\0';			} else {				out_test[q_test++] = '\\';				out_test[q_test++] = '0';			}		} 		/* Don't try strings that have no output */		out = test_string_find_match(s2, flags);		if (!out)			continue; 		/* Copy string to in buffer */		len = strlen(s2->in);		memcpy(&in[p], s2->in, len);		p += len; 		/* Copy expected result for given flags */		len = strlen(out);		memcpy(&out_test[q_test], out, len);		q_test += len;	} 	q_real = string_escape_mem(in, p, out_real, out_size, flags, esc); 	test_string_check_buf(test, name, flags, in, p, out_real, q_real, out_test,			      q_test); 	test_string_escape_overflow(test, in, p, flags, esc, q_test, name);} #define string_get_size_maxbuf 16#define test_string_get_size_one(size, blk_size, exp_result10, exp_result2)      \	do {                                                                     \		BUILD_BUG_ON(sizeof(exp_result10) >= string_get_size_maxbuf);    \		BUILD_BUG_ON(sizeof(exp_result2) >= string_get_size_maxbuf);     \		__test_string_get_size(test, (size), (blk_size), (exp_result10), \				       (exp_result2));                           \	} while (0)  static void test_string_get_size_check(struct kunit *test,				       const char *units,				       const char *exp,				       char *res,				       const u64 size,				       const u64 blk_size){	KUNIT_EXPECT_MEMEQ_MSG(test, res, exp, strlen(exp) + 1,		"string_get_size(size = %llu, blk_size = %llu, units = %s)",		size, blk_size, units);} static void __strchrcut(char *dst, const char *src, const char *cut){	const char *from = src;	size_t len; 	do {		len = strcspn(from, cut);		memcpy(dst, from, len);		dst += len;		from += len;	} while (*from++);	*dst = '\0';} static void __test_string_get_size_one(struct kunit *test,				       const u64 size, const u64 blk_size,				       const char *exp_result10,				       const char *exp_result2,				       enum string_size_units units,

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