linux/lib/test-hexdump.c
Linus Torvalds 17974c054d hexdump: avoid warning in test function
The test_data_1_le[] array is a const array of const char *.  To avoid
dropping any const information, we need to use "const char * const *",
not just "const char **".

I'm not sure why the different test arrays end up having different
const'ness, but let's make the pointer we use to traverse them as const
as possible, since we modify neither the array of pointers _or_ the
pointers we find in the array.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-04-19 13:48:40 -07:00

181 lines
4.0 KiB
C

/*
* Test cases for lib/hexdump.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>
static const unsigned char data_b[] = {
'\xbe', '\x32', '\xdb', '\x7b', '\x0a', '\x18', '\x93', '\xb2', /* 00 - 07 */
'\x70', '\xba', '\xc4', '\x24', '\x7d', '\x83', '\x34', '\x9b', /* 08 - 0f */
'\xa6', '\x9c', '\x31', '\xad', '\x9c', '\x0f', '\xac', '\xe9', /* 10 - 17 */
'\x4c', '\xd1', '\x19', '\x99', '\x43', '\xb1', '\xaf', '\x0c', /* 18 - 1f */
};
static const unsigned char data_a[] = ".2.{....p..$}.4...1.....L...C...";
static const char * const test_data_1_le[] __initconst = {
"be", "32", "db", "7b", "0a", "18", "93", "b2",
"70", "ba", "c4", "24", "7d", "83", "34", "9b",
"a6", "9c", "31", "ad", "9c", "0f", "ac", "e9",
"4c", "d1", "19", "99", "43", "b1", "af", "0c",
};
static const char *test_data_2_le[] __initdata = {
"32be", "7bdb", "180a", "b293",
"ba70", "24c4", "837d", "9b34",
"9ca6", "ad31", "0f9c", "e9ac",
"d14c", "9919", "b143", "0caf",
};
static const char *test_data_4_le[] __initdata = {
"7bdb32be", "b293180a", "24c4ba70", "9b34837d",
"ad319ca6", "e9ac0f9c", "9919d14c", "0cafb143",
};
static const char *test_data_8_le[] __initdata = {
"b293180a7bdb32be", "9b34837d24c4ba70",
"e9ac0f9cad319ca6", "0cafb1439919d14c",
};
static void __init test_hexdump(size_t len, int rowsize, int groupsize,
bool ascii)
{
char test[32 * 3 + 2 + 32 + 1];
char real[32 * 3 + 2 + 32 + 1];
char *p;
const char * const *result;
size_t l = len;
int gs = groupsize, rs = rowsize;
unsigned int i;
hex_dump_to_buffer(data_b, l, rs, gs, real, sizeof(real), ascii);
if (rs != 16 && rs != 32)
rs = 16;
if (l > rs)
l = rs;
if (!is_power_of_2(gs) || gs > 8 || (len % gs != 0))
gs = 1;
if (gs == 8)
result = test_data_8_le;
else if (gs == 4)
result = test_data_4_le;
else if (gs == 2)
result = test_data_2_le;
else
result = test_data_1_le;
memset(test, ' ', sizeof(test));
/* hex dump */
p = test;
for (i = 0; i < l / gs; i++) {
const char *q = *result++;
size_t amount = strlen(q);
strncpy(p, q, amount);
p += amount + 1;
}
if (i)
p--;
/* ASCII part */
if (ascii) {
p = test + rs * 2 + rs / gs + 1;
strncpy(p, data_a, l);
p += l;
}
*p = '\0';
if (strcmp(test, real)) {
pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);
pr_err("Result: '%s'\n", real);
pr_err("Expect: '%s'\n", test);
}
}
static void __init test_hexdump_set(int rowsize, bool ascii)
{
size_t d = min_t(size_t, sizeof(data_b), rowsize);
size_t len = get_random_int() % d + 1;
test_hexdump(len, rowsize, 4, ascii);
test_hexdump(len, rowsize, 2, ascii);
test_hexdump(len, rowsize, 8, ascii);
test_hexdump(len, rowsize, 1, ascii);
}
static void __init test_hexdump_overflow(bool ascii)
{
char buf[56];
const char *t = test_data_1_le[0];
size_t l = get_random_int() % sizeof(buf);
bool a;
int e, r;
memset(buf, ' ', sizeof(buf));
r = hex_dump_to_buffer(data_b, 1, 16, 1, buf, l, ascii);
if (ascii)
e = 50;
else
e = 2;
buf[e + 2] = '\0';
if (!l) {
a = r == e && buf[0] == ' ';
} else if (l < 3) {
a = r == e && buf[0] == '\0';
} else if (l < 4) {
a = r == e && !strcmp(buf, t);
} else if (ascii) {
if (l < 51)
a = r == e && buf[l - 1] == '\0' && buf[l - 2] == ' ';
else
a = r == e && buf[50] == '\0' && buf[49] == '.';
} else {
a = r == e && buf[e] == '\0';
}
if (!a) {
pr_err("Len: %zu rc: %u strlen: %zu\n", l, r, strlen(buf));
pr_err("Result: '%s'\n", buf);
}
}
static int __init test_hexdump_init(void)
{
unsigned int i;
int rowsize;
pr_info("Running tests...\n");
rowsize = (get_random_int() % 2 + 1) * 16;
for (i = 0; i < 16; i++)
test_hexdump_set(rowsize, false);
rowsize = (get_random_int() % 2 + 1) * 16;
for (i = 0; i < 16; i++)
test_hexdump_set(rowsize, true);
for (i = 0; i < 16; i++)
test_hexdump_overflow(false);
for (i = 0; i < 16; i++)
test_hexdump_overflow(true);
return -EINVAL;
}
module_init(test_hexdump_init);
MODULE_LICENSE("Dual BSD/GPL");