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linux/lib/test-string_helpers.c
Andy Shevchenko c8250381c8 lib / string_helpers: introduce string_escape_mem() 
This is almost the opposite function to string_unescape().  Nevertheless
it handles \0 and could be used for any byte buffer.

The documentation is supplied together with the function prototype.

The test cases covers most of the scenarios and would be expanded later
on.

[akpm@linux-foundation.org: avoid 1k stack consumption]
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: "John W . Linville" <linville@tuxdriver.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Joe Perches <joe@perches.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-10-14 02:18:26 +02:00

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/*
* 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/slab.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/string.h>
#include <linux/string_helpers.h>
static __init bool test_string_check_buf(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)
{
if (q_real == q_test && !memcmp(out_test, out_real, q_test))
return true;
pr_warn("Test '%s' failed: flags = %u\n", name, flags);
print_hex_dump(KERN_WARNING, "Input: ", DUMP_PREFIX_NONE, 16, 1,
in, p, 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);
return false;
}
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(const char *name, unsigned int flags,
bool inplace)
{
int q_real = 256;
char *in = kmalloc(q_real, GFP_KERNEL);
char *out_test = kmalloc(q_real, GFP_KERNEL);
char *out_real = kmalloc(q_real, GFP_KERNEL);
int i, p = 0, q_test = 0;
if (!in || !out_test || !out_real)
goto out;
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(name, flags, in, p - 1, out_real, q_real,
out_test, q_test);
out:
kfree(out_real);
kfree(out_test);
kfree(in);
}
struct test_string_1 {
const char *out;
unsigned int flags;
};
#define TEST_STRING_2_MAX_S1 32
struct test_string_2 {
const char *in;
struct test_string_1 s1[TEST_STRING_2_MAX_S1];
};
#define TEST_STRING_2_DICT_0 NULL
static const struct test_string_2 escape0[] __initconst = {{
.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\\\\\\042\\a\\e\\\\",
.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL,
},{
.out = "\\\\\\x68\\\\\\x22\\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\\042\\220\\015\\135",
.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL,
},{
.out = "\\e\\142\\040\\\\\\103\\a\\042\\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 */
}},
},{
/* terminator */
}};
#define TEST_STRING_2_DICT_1 "b\\ \t\r"
static const struct test_string_2 escape1[] __initconst = {{
.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,
},{
/* terminator */
}},
},{
.in = "\\h\\\"\a\e\\",
.s1 = {{
.out = "\\134h\\134\"\a\e\\134",
.flags = ESCAPE_OCTAL,
},{
/* terminator */
}},
},{
.in = "\eb \\C\007\"\x90\r]",
.s1 = {{
.out = "\e\\142\\040\\134C\007\"\x90\\015]",
.flags = ESCAPE_OCTAL,
},{
/* terminator */
}},
},{
/* terminator */
}};
static __init 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 __init void test_string_escape(const char *name,
const struct test_string_2 *s2,
unsigned int flags, const char *esc)
{
int q_real = 512;
char *out_test = kmalloc(q_real, GFP_KERNEL);
char *out_real = kmalloc(q_real, GFP_KERNEL);
char *in = kmalloc(256, GFP_KERNEL);
char *buf = out_real;
int p = 0, q_test = 0;
if (!out_test || !out_real || !in)
goto out;
for (; s2->in; s2++) {
const char *out;
int len;
/* NULL injection */
if (flags & ESCAPE_NULL) {
in[p++] = '\0';
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, &buf, q_real, flags, esc);
test_string_check_buf(name, flags, in, p, out_real, q_real, out_test,
q_test);
out:
kfree(in);
kfree(out_real);
kfree(out_test);
}
static __init void test_string_escape_nomem(void)
{
char *in = "\eb \\C\007\"\x90\r]";
char out[64], *buf = out;
int rc = -ENOMEM, ret;
ret = string_escape_str_any_np(in, &buf, strlen(in), NULL);
if (ret == rc)
return;
pr_err("Test 'escape nomem' failed: got %d instead of %d\n", ret, rc);
}
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("unescape", i, false);
test_string_unescape("unescape inplace",
get_random_int() % (UNESCAPE_ANY + 1), true);
/* Without dictionary */
for (i = 0; i < (ESCAPE_ANY_NP | ESCAPE_HEX) + 1; i++)
test_string_escape("escape 0", escape0, i, TEST_STRING_2_DICT_0);
/* With dictionary */
for (i = 0; i < (ESCAPE_ANY_NP | ESCAPE_HEX) + 1; i++)
test_string_escape("escape 1", escape1, i, TEST_STRING_2_DICT_1);
test_string_escape_nomem();
return -EINVAL;
}
module_init(test_string_helpers_init);
MODULE_LICENSE("Dual BSD/GPL");
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