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linux/lib/test_scanf.c
Richard Fitzgerald 1b932689c7 lib: test_scanf: Remove pointless use of type_min() with unsigned types 
sparse was producing warnings of the form:

 sparse: cast truncates bits from constant value (ffff0001 becomes 1)

There is no actual problem here. Using type_min() on an unsigned type
results in an (expected) truncation.

However, there is no need to test an unsigned value against type_min().
The minimum value of an unsigned is obviously 0, and any value cast to
an unsigned type is >= 0, so for unsigneds only type_max() need be tested.

This patch also takes the opportunity to clean up the implementation of
simple_numbers_loop() to use a common pattern for the positive and
negative test.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20210525122012.6336-2-rf@opensource.cirrus.com
2021-05-27 15:38:03 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Test cases for sscanf facility.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/printk.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "../tools/testing/selftests/kselftest_module.h"
#define BUF_SIZE 1024
KSTM_MODULE_GLOBALS();
static char *test_buffer __initdata;
static char *fmt_buffer __initdata;
static struct rnd_state rnd_state __initdata;
typedef int (*check_fn)(const void *check_data, const char *string,
const char *fmt, int n_args, va_list ap);
static void __scanf(4, 6) __init
_test(check_fn fn, const void *check_data, const char *string, const char *fmt,
int n_args, ...)
{
va_list ap, ap_copy;
int ret;
total_tests++;
va_start(ap, n_args);
va_copy(ap_copy, ap);
ret = vsscanf(string, fmt, ap_copy);
va_end(ap_copy);
if (ret != n_args) {
pr_warn("vsscanf(\"%s\", \"%s\", ...) returned %d expected %d\n",
string, fmt, ret, n_args);
goto fail;
}
ret = (*fn)(check_data, string, fmt, n_args, ap);
if (ret)
goto fail;
va_end(ap);
return;
fail:
failed_tests++;
va_end(ap);
}
#define _check_numbers_template(arg_fmt, expect, str, fmt, n_args, ap) \
do { \
pr_debug("\"%s\", \"%s\" ->\n", str, fmt); \
for (; n_args > 0; n_args--, expect++) { \
typeof(*expect) got = *va_arg(ap, typeof(expect)); \
pr_debug("\t" arg_fmt "\n", got); \
if (got != *expect) { \
pr_warn("vsscanf(\"%s\", \"%s\", ...) expected " arg_fmt " got " arg_fmt "\n", \
str, fmt, *expect, got); \
return 1; \
} \
} \
return 0; \
} while (0)
static int __init check_ull(const void *check_data, const char *string,
const char *fmt, int n_args, va_list ap)
{
const unsigned long long *pval = check_data;
_check_numbers_template("%llu", pval, string, fmt, n_args, ap);
}
static int __init check_ll(const void *check_data, const char *string,
const char *fmt, int n_args, va_list ap)
{
const long long *pval = check_data;
_check_numbers_template("%lld", pval, string, fmt, n_args, ap);
}
static int __init check_ulong(const void *check_data, const char *string,
const char *fmt, int n_args, va_list ap)
{
const unsigned long *pval = check_data;
_check_numbers_template("%lu", pval, string, fmt, n_args, ap);
}
static int __init check_long(const void *check_data, const char *string,
const char *fmt, int n_args, va_list ap)
{
const long *pval = check_data;
_check_numbers_template("%ld", pval, string, fmt, n_args, ap);
}
static int __init check_uint(const void *check_data, const char *string,
const char *fmt, int n_args, va_list ap)
{
const unsigned int *pval = check_data;
_check_numbers_template("%u", pval, string, fmt, n_args, ap);
}
static int __init check_int(const void *check_data, const char *string,
const char *fmt, int n_args, va_list ap)
{
const int *pval = check_data;
_check_numbers_template("%d", pval, string, fmt, n_args, ap);
}
static int __init check_ushort(const void *check_data, const char *string,
const char *fmt, int n_args, va_list ap)
{
const unsigned short *pval = check_data;
_check_numbers_template("%hu", pval, string, fmt, n_args, ap);
}
static int __init check_short(const void *check_data, const char *string,
const char *fmt, int n_args, va_list ap)
{
const short *pval = check_data;
_check_numbers_template("%hd", pval, string, fmt, n_args, ap);
}
static int __init check_uchar(const void *check_data, const char *string,
const char *fmt, int n_args, va_list ap)
{
const unsigned char *pval = check_data;
_check_numbers_template("%hhu", pval, string, fmt, n_args, ap);
}
static int __init check_char(const void *check_data, const char *string,
const char *fmt, int n_args, va_list ap)
{
const signed char *pval = check_data;
_check_numbers_template("%hhd", pval, string, fmt, n_args, ap);
}
/* Selection of interesting numbers to test, copied from test-kstrtox.c */
static const unsigned long long numbers[] __initconst = {
0x0ULL,
0x1ULL,
0x7fULL,
0x80ULL,
0x81ULL,
0xffULL,
0x100ULL,
0x101ULL,
0x7fffULL,
0x8000ULL,
0x8001ULL,
0xffffULL,
0x10000ULL,
0x10001ULL,
0x7fffffffULL,
0x80000000ULL,
0x80000001ULL,
0xffffffffULL,
0x100000000ULL,
0x100000001ULL,
0x7fffffffffffffffULL,
0x8000000000000000ULL,
0x8000000000000001ULL,
0xfffffffffffffffeULL,
0xffffffffffffffffULL,
};
#define value_representable_in_type(T, val) \
(is_signed_type(T) \
? ((long long)(val) >= type_min(T)) && ((long long)(val) <= type_max(T)) \
: ((unsigned long long)(val) <= type_max(T)))
#define test_one_number(T, gen_fmt, scan_fmt, val, fn) \
do { \
const T expect_val = (T)(val); \
T result = ~expect_val; /* should be overwritten */ \
\
snprintf(test_buffer, BUF_SIZE, gen_fmt, expect_val); \
_test(fn, &expect_val, test_buffer, "%" scan_fmt, 1, &result); \
} while (0)
#define simple_numbers_loop(T, gen_fmt, scan_fmt, fn) \
do { \
int i; \
\
for (i = 0; i < ARRAY_SIZE(numbers); i++) { \
if (value_representable_in_type(T, numbers[i])) \
test_one_number(T, gen_fmt, scan_fmt, \
numbers[i], fn); \
\
if (value_representable_in_type(T, -numbers[i])) \
test_one_number(T, gen_fmt, scan_fmt, \
-numbers[i], fn); \
} \
} while (0)
static void __init numbers_simple(void)
{
simple_numbers_loop(unsigned long long, "%llu", "llu", check_ull);
simple_numbers_loop(long long, "%lld", "lld", check_ll);
simple_numbers_loop(long long, "%lld", "lli", check_ll);
simple_numbers_loop(unsigned long long, "%llx", "llx", check_ull);
simple_numbers_loop(long long, "%llx", "llx", check_ll);
simple_numbers_loop(long long, "0x%llx", "lli", check_ll);
simple_numbers_loop(unsigned long long, "0x%llx", "llx", check_ull);
simple_numbers_loop(long long, "0x%llx", "llx", check_ll);
simple_numbers_loop(unsigned long, "%lu", "lu", check_ulong);
simple_numbers_loop(long, "%ld", "ld", check_long);
simple_numbers_loop(long, "%ld", "li", check_long);
simple_numbers_loop(unsigned long, "%lx", "lx", check_ulong);
simple_numbers_loop(long, "%lx", "lx", check_long);
simple_numbers_loop(long, "0x%lx", "li", check_long);
simple_numbers_loop(unsigned long, "0x%lx", "lx", check_ulong);
simple_numbers_loop(long, "0x%lx", "lx", check_long);
simple_numbers_loop(unsigned int, "%u", "u", check_uint);
simple_numbers_loop(int, "%d", "d", check_int);
simple_numbers_loop(int, "%d", "i", check_int);
simple_numbers_loop(unsigned int, "%x", "x", check_uint);
simple_numbers_loop(int, "%x", "x", check_int);
simple_numbers_loop(int, "0x%x", "i", check_int);
simple_numbers_loop(unsigned int, "0x%x", "x", check_uint);
simple_numbers_loop(int, "0x%x", "x", check_int);
simple_numbers_loop(unsigned short, "%hu", "hu", check_ushort);
simple_numbers_loop(short, "%hd", "hd", check_short);
simple_numbers_loop(short, "%hd", "hi", check_short);
simple_numbers_loop(unsigned short, "%hx", "hx", check_ushort);
simple_numbers_loop(short, "%hx", "hx", check_short);
simple_numbers_loop(short, "0x%hx", "hi", check_short);
simple_numbers_loop(unsigned short, "0x%hx", "hx", check_ushort);
simple_numbers_loop(short, "0x%hx", "hx", check_short);
simple_numbers_loop(unsigned char, "%hhu", "hhu", check_uchar);
simple_numbers_loop(signed char, "%hhd", "hhd", check_char);
simple_numbers_loop(signed char, "%hhd", "hhi", check_char);
simple_numbers_loop(unsigned char, "%hhx", "hhx", check_uchar);
simple_numbers_loop(signed char, "%hhx", "hhx", check_char);
simple_numbers_loop(signed char, "0x%hhx", "hhi", check_char);
simple_numbers_loop(unsigned char, "0x%hhx", "hhx", check_uchar);
simple_numbers_loop(signed char, "0x%hhx", "hhx", check_char);
}
/*
* This gives a better variety of number "lengths" in a small sample than
* the raw prandom*() functions (Not mathematically rigorous!!).
* Variabilty of length and value is more important than perfect randomness.
*/
static u32 __init next_test_random(u32 max_bits)
{
u32 n_bits = hweight32(prandom_u32_state(&rnd_state)) % (max_bits + 1);
return prandom_u32_state(&rnd_state) & (UINT_MAX >> (32 - n_bits));
}
static unsigned long long __init next_test_random_ull(void)
{
u32 rand1 = prandom_u32_state(&rnd_state);
u32 n_bits = (hweight32(rand1) * 3) % 64;
u64 val = (u64)prandom_u32_state(&rnd_state) * rand1;
return val & (ULLONG_MAX >> (64 - n_bits));
}
#define random_for_type(T) \
((T)(sizeof(T) <= sizeof(u32) \
? next_test_random(BITS_PER_TYPE(T)) \
: next_test_random_ull()))
/*
* Define a pattern of negative and positive numbers to ensure we get
* some of both within the small number of samples in a test string.
*/
#define NEGATIVES_PATTERN 0x3246 /* 00110010 01000110 */
#define fill_random_array(arr) \
do { \
unsigned int neg_pattern = NEGATIVES_PATTERN; \
int i; \
\
for (i = 0; i < ARRAY_SIZE(arr); i++, neg_pattern >>= 1) { \
(arr)[i] = random_for_type(typeof((arr)[0])); \
if (is_signed_type(typeof((arr)[0])) && (neg_pattern & 1)) \
(arr)[i] = -(arr)[i]; \
} \
} while (0)
/*
* Convenience wrapper around snprintf() to append at buf_pos in buf,
* updating buf_pos and returning the number of characters appended.
* On error buf_pos is not changed and return value is 0.
*/
static int __init __printf(4, 5)
append_fmt(char *buf, int *buf_pos, int buf_len, const char *val_fmt, ...)
{
va_list ap;
int field_len;
va_start(ap, val_fmt);
field_len = vsnprintf(buf + *buf_pos, buf_len - *buf_pos, val_fmt, ap);
va_end(ap);
if (field_len < 0)
field_len = 0;
*buf_pos += field_len;
return field_len;
}
/*
* Convenience function to append the field delimiter string
* to both the value string and format string buffers.
*/
static void __init append_delim(char *str_buf, int *str_buf_pos, int str_buf_len,
char *fmt_buf, int *fmt_buf_pos, int fmt_buf_len,
const char *delim_str)
{
append_fmt(str_buf, str_buf_pos, str_buf_len, delim_str);
append_fmt(fmt_buf, fmt_buf_pos, fmt_buf_len, delim_str);
}
#define test_array_8(fn, check_data, string, fmt, arr) \
do { \
BUILD_BUG_ON(ARRAY_SIZE(arr) != 8); \
_test(fn, check_data, string, fmt, 8, \
&(arr)[0], &(arr)[1], &(arr)[2], &(arr)[3], \
&(arr)[4], &(arr)[5], &(arr)[6], &(arr)[7]); \
} while (0)
#define numbers_list_8(T, gen_fmt, field_sep, scan_fmt, fn) \
do { \
int i, pos = 0, fmt_pos = 0; \
T expect[8], result[8]; \
\
fill_random_array(expect); \
\
for (i = 0; i < ARRAY_SIZE(expect); i++) { \
if (i != 0) \
append_delim(test_buffer, &pos, BUF_SIZE, \
fmt_buffer, &fmt_pos, BUF_SIZE, \
field_sep); \
\
append_fmt(test_buffer, &pos, BUF_SIZE, gen_fmt, expect[i]); \
append_fmt(fmt_buffer, &fmt_pos, BUF_SIZE, "%%%s", scan_fmt); \
} \
\
test_array_8(fn, expect, test_buffer, fmt_buffer, result); \
} while (0)
#define numbers_list_fix_width(T, gen_fmt, field_sep, width, scan_fmt, fn) \
do { \
char full_fmt[16]; \
\
snprintf(full_fmt, sizeof(full_fmt), "%u%s", width, scan_fmt); \
numbers_list_8(T, gen_fmt, field_sep, full_fmt, fn); \
} while (0)
#define numbers_list_val_width(T, gen_fmt, field_sep, scan_fmt, fn) \
do { \
int i, val_len, pos = 0, fmt_pos = 0; \
T expect[8], result[8]; \
\
fill_random_array(expect); \
\
for (i = 0; i < ARRAY_SIZE(expect); i++) { \
if (i != 0) \
append_delim(test_buffer, &pos, BUF_SIZE, \
fmt_buffer, &fmt_pos, BUF_SIZE, field_sep);\
\
val_len = append_fmt(test_buffer, &pos, BUF_SIZE, gen_fmt, \
expect[i]); \
append_fmt(fmt_buffer, &fmt_pos, BUF_SIZE, \
"%%%u%s", val_len, scan_fmt); \
} \
\
test_array_8(fn, expect, test_buffer, fmt_buffer, result); \
} while (0)
static void __init numbers_list(const char *delim)
{
numbers_list_8(unsigned long long, "%llu", delim, "llu", check_ull);
numbers_list_8(long long, "%lld", delim, "lld", check_ll);
numbers_list_8(long long, "%lld", delim, "lli", check_ll);
numbers_list_8(unsigned long long, "%llx", delim, "llx", check_ull);
numbers_list_8(unsigned long long, "0x%llx", delim, "llx", check_ull);
numbers_list_8(long long, "0x%llx", delim, "lli", check_ll);
numbers_list_8(unsigned long, "%lu", delim, "lu", check_ulong);
numbers_list_8(long, "%ld", delim, "ld", check_long);
numbers_list_8(long, "%ld", delim, "li", check_long);
numbers_list_8(unsigned long, "%lx", delim, "lx", check_ulong);
numbers_list_8(unsigned long, "0x%lx", delim, "lx", check_ulong);
numbers_list_8(long, "0x%lx", delim, "li", check_long);
numbers_list_8(unsigned int, "%u", delim, "u", check_uint);
numbers_list_8(int, "%d", delim, "d", check_int);
numbers_list_8(int, "%d", delim, "i", check_int);
numbers_list_8(unsigned int, "%x", delim, "x", check_uint);
numbers_list_8(unsigned int, "0x%x", delim, "x", check_uint);
numbers_list_8(int, "0x%x", delim, "i", check_int);
numbers_list_8(unsigned short, "%hu", delim, "hu", check_ushort);
numbers_list_8(short, "%hd", delim, "hd", check_short);
numbers_list_8(short, "%hd", delim, "hi", check_short);
numbers_list_8(unsigned short, "%hx", delim, "hx", check_ushort);
numbers_list_8(unsigned short, "0x%hx", delim, "hx", check_ushort);
numbers_list_8(short, "0x%hx", delim, "hi", check_short);
numbers_list_8(unsigned char, "%hhu", delim, "hhu", check_uchar);
numbers_list_8(signed char, "%hhd", delim, "hhd", check_char);
numbers_list_8(signed char, "%hhd", delim, "hhi", check_char);
numbers_list_8(unsigned char, "%hhx", delim, "hhx", check_uchar);
numbers_list_8(unsigned char, "0x%hhx", delim, "hhx", check_uchar);
numbers_list_8(signed char, "0x%hhx", delim, "hhi", check_char);
}
/*
* List of numbers separated by delim. Each field width specifier is the
* maximum possible digits for the given type and base.
*/
static void __init numbers_list_field_width_typemax(const char *delim)
{
numbers_list_fix_width(unsigned long long, "%llu", delim, 20, "llu", check_ull);
numbers_list_fix_width(long long, "%lld", delim, 20, "lld", check_ll);
numbers_list_fix_width(long long, "%lld", delim, 20, "lli", check_ll);
numbers_list_fix_width(unsigned long long, "%llx", delim, 16, "llx", check_ull);
numbers_list_fix_width(unsigned long long, "0x%llx", delim, 18, "llx", check_ull);
numbers_list_fix_width(long long, "0x%llx", delim, 18, "lli", check_ll);
#if BITS_PER_LONG == 64
numbers_list_fix_width(unsigned long, "%lu", delim, 20, "lu", check_ulong);
numbers_list_fix_width(long, "%ld", delim, 20, "ld", check_long);
numbers_list_fix_width(long, "%ld", delim, 20, "li", check_long);
numbers_list_fix_width(unsigned long, "%lx", delim, 16, "lx", check_ulong);
numbers_list_fix_width(unsigned long, "0x%lx", delim, 18, "lx", check_ulong);
numbers_list_fix_width(long, "0x%lx", delim, 18, "li", check_long);
#else
numbers_list_fix_width(unsigned long, "%lu", delim, 10, "lu", check_ulong);
numbers_list_fix_width(long, "%ld", delim, 11, "ld", check_long);
numbers_list_fix_width(long, "%ld", delim, 11, "li", check_long);
numbers_list_fix_width(unsigned long, "%lx", delim, 8, "lx", check_ulong);
numbers_list_fix_width(unsigned long, "0x%lx", delim, 10, "lx", check_ulong);
numbers_list_fix_width(long, "0x%lx", delim, 10, "li", check_long);
#endif
numbers_list_fix_width(unsigned int, "%u", delim, 10, "u", check_uint);
numbers_list_fix_width(int, "%d", delim, 11, "d", check_int);
numbers_list_fix_width(int, "%d", delim, 11, "i", check_int);
numbers_list_fix_width(unsigned int, "%x", delim, 8, "x", check_uint);
numbers_list_fix_width(unsigned int, "0x%x", delim, 10, "x", check_uint);
numbers_list_fix_width(int, "0x%x", delim, 10, "i", check_int);
numbers_list_fix_width(unsigned short, "%hu", delim, 5, "hu", check_ushort);
numbers_list_fix_width(short, "%hd", delim, 6, "hd", check_short);
numbers_list_fix_width(short, "%hd", delim, 6, "hi", check_short);
numbers_list_fix_width(unsigned short, "%hx", delim, 4, "hx", check_ushort);
numbers_list_fix_width(unsigned short, "0x%hx", delim, 6, "hx", check_ushort);
numbers_list_fix_width(short, "0x%hx", delim, 6, "hi", check_short);
numbers_list_fix_width(unsigned char, "%hhu", delim, 3, "hhu", check_uchar);
numbers_list_fix_width(signed char, "%hhd", delim, 4, "hhd", check_char);
numbers_list_fix_width(signed char, "%hhd", delim, 4, "hhi", check_char);
numbers_list_fix_width(unsigned char, "%hhx", delim, 2, "hhx", check_uchar);
numbers_list_fix_width(unsigned char, "0x%hhx", delim, 4, "hhx", check_uchar);
numbers_list_fix_width(signed char, "0x%hhx", delim, 4, "hhi", check_char);
}
/*
* List of numbers separated by delim. Each field width specifier is the
* exact length of the corresponding value digits in the string being scanned.
*/
static void __init numbers_list_field_width_val_width(const char *delim)
{
numbers_list_val_width(unsigned long long, "%llu", delim, "llu", check_ull);
numbers_list_val_width(long long, "%lld", delim, "lld", check_ll);
numbers_list_val_width(long long, "%lld", delim, "lli", check_ll);
numbers_list_val_width(unsigned long long, "%llx", delim, "llx", check_ull);
numbers_list_val_width(unsigned long long, "0x%llx", delim, "llx", check_ull);
numbers_list_val_width(long long, "0x%llx", delim, "lli", check_ll);
numbers_list_val_width(unsigned long, "%lu", delim, "lu", check_ulong);
numbers_list_val_width(long, "%ld", delim, "ld", check_long);
numbers_list_val_width(long, "%ld", delim, "li", check_long);
numbers_list_val_width(unsigned long, "%lx", delim, "lx", check_ulong);
numbers_list_val_width(unsigned long, "0x%lx", delim, "lx", check_ulong);
numbers_list_val_width(long, "0x%lx", delim, "li", check_long);
numbers_list_val_width(unsigned int, "%u", delim, "u", check_uint);
numbers_list_val_width(int, "%d", delim, "d", check_int);
numbers_list_val_width(int, "%d", delim, "i", check_int);
numbers_list_val_width(unsigned int, "%x", delim, "x", check_uint);
numbers_list_val_width(unsigned int, "0x%x", delim, "x", check_uint);
numbers_list_val_width(int, "0x%x", delim, "i", check_int);
numbers_list_val_width(unsigned short, "%hu", delim, "hu", check_ushort);
numbers_list_val_width(short, "%hd", delim, "hd", check_short);
numbers_list_val_width(short, "%hd", delim, "hi", check_short);
numbers_list_val_width(unsigned short, "%hx", delim, "hx", check_ushort);
numbers_list_val_width(unsigned short, "0x%hx", delim, "hx", check_ushort);
numbers_list_val_width(short, "0x%hx", delim, "hi", check_short);
numbers_list_val_width(unsigned char, "%hhu", delim, "hhu", check_uchar);
numbers_list_val_width(signed char, "%hhd", delim, "hhd", check_char);
numbers_list_val_width(signed char, "%hhd", delim, "hhi", check_char);
numbers_list_val_width(unsigned char, "%hhx", delim, "hhx", check_uchar);
numbers_list_val_width(unsigned char, "0x%hhx", delim, "hhx", check_uchar);
numbers_list_val_width(signed char, "0x%hhx", delim, "hhi", check_char);
}
/*
* Slice a continuous string of digits without field delimiters, containing
* numbers of varying length, using the field width to extract each group
* of digits. For example the hex values c0,3,bf01,303 would have a
* string representation of "c03bf01303" and extracted with "%2x%1x%4x%3x".
*/
static void __init numbers_slice(void)
{
numbers_list_field_width_val_width("");
}
#define test_number_prefix(T, str, scan_fmt, expect0, expect1, n_args, fn) \
do { \
const T expect[2] = { expect0, expect1 }; \
T result[2] = {~expect[0], ~expect[1]}; \
\
_test(fn, &expect, str, scan_fmt, n_args, &result[0], &result[1]); \
} while (0)
/*
* Number prefix is >= field width.
* Expected behaviour is derived from testing userland sscanf.
*/
static void __init numbers_prefix_overflow(void)
{
/*
* Negative decimal with a field of width 1, should quit scanning
* and return 0.
*/
test_number_prefix(long long, "-1 1", "%1lld %lld", 0, 0, 0, check_ll);
test_number_prefix(long, "-1 1", "%1ld %ld", 0, 0, 0, check_long);
test_number_prefix(int, "-1 1", "%1d %d", 0, 0, 0, check_int);
test_number_prefix(short, "-1 1", "%1hd %hd", 0, 0, 0, check_short);
test_number_prefix(signed char, "-1 1", "%1hhd %hhd", 0, 0, 0, check_char);
test_number_prefix(long long, "-1 1", "%1lli %lli", 0, 0, 0, check_ll);
test_number_prefix(long, "-1 1", "%1li %li", 0, 0, 0, check_long);
test_number_prefix(int, "-1 1", "%1i %i", 0, 0, 0, check_int);
test_number_prefix(short, "-1 1", "%1hi %hi", 0, 0, 0, check_short);
test_number_prefix(signed char, "-1 1", "%1hhi %hhi", 0, 0, 0, check_char);
/*
* 0x prefix in a field of width 1: 0 is a valid digit so should
* convert. Next field scan starts at the 'x' which isn't a digit so
* scan quits with one field converted.
*/
test_number_prefix(unsigned long long, "0xA7", "%1llx%llx", 0, 0, 1, check_ull);
test_number_prefix(unsigned long, "0xA7", "%1lx%lx", 0, 0, 1, check_ulong);
test_number_prefix(unsigned int, "0xA7", "%1x%x", 0, 0, 1, check_uint);
test_number_prefix(unsigned short, "0xA7", "%1hx%hx", 0, 0, 1, check_ushort);
test_number_prefix(unsigned char, "0xA7", "%1hhx%hhx", 0, 0, 1, check_uchar);
test_number_prefix(long long, "0xA7", "%1lli%llx", 0, 0, 1, check_ll);
test_number_prefix(long, "0xA7", "%1li%lx", 0, 0, 1, check_long);
test_number_prefix(int, "0xA7", "%1i%x", 0, 0, 1, check_int);
test_number_prefix(short, "0xA7", "%1hi%hx", 0, 0, 1, check_short);
test_number_prefix(char, "0xA7", "%1hhi%hhx", 0, 0, 1, check_char);
/*
* 0x prefix in a field of width 2 using %x conversion: first field
* converts to 0. Next field scan starts at the character after "0x".
* Both fields will convert.
*/
test_number_prefix(unsigned long long, "0xA7", "%2llx%llx", 0, 0xa7, 2, check_ull);
test_number_prefix(unsigned long, "0xA7", "%2lx%lx", 0, 0xa7, 2, check_ulong);
test_number_prefix(unsigned int, "0xA7", "%2x%x", 0, 0xa7, 2, check_uint);
test_number_prefix(unsigned short, "0xA7", "%2hx%hx", 0, 0xa7, 2, check_ushort);
test_number_prefix(unsigned char, "0xA7", "%2hhx%hhx", 0, 0xa7, 2, check_uchar);
/*
* 0x prefix in a field of width 2 using %i conversion: first field
* converts to 0. Next field scan starts at the character after "0x",
* which will convert if can be intepreted as decimal but will fail
* if it contains any hex digits (since no 0x prefix).
*/
test_number_prefix(long long, "0x67", "%2lli%lli", 0, 67, 2, check_ll);
test_number_prefix(long, "0x67", "%2li%li", 0, 67, 2, check_long);
test_number_prefix(int, "0x67", "%2i%i", 0, 67, 2, check_int);
test_number_prefix(short, "0x67", "%2hi%hi", 0, 67, 2, check_short);
test_number_prefix(char, "0x67", "%2hhi%hhi", 0, 67, 2, check_char);
test_number_prefix(long long, "0xA7", "%2lli%lli", 0, 0, 1, check_ll);
test_number_prefix(long, "0xA7", "%2li%li", 0, 0, 1, check_long);
test_number_prefix(int, "0xA7", "%2i%i", 0, 0, 1, check_int);
test_number_prefix(short, "0xA7", "%2hi%hi", 0, 0, 1, check_short);
test_number_prefix(char, "0xA7", "%2hhi%hhi", 0, 0, 1, check_char);
}
#define _test_simple_strtoxx(T, fn, gen_fmt, expect, base) \
do { \
T got; \
char *endp; \
int len; \
bool fail = false; \
\
total_tests++; \
len = snprintf(test_buffer, BUF_SIZE, gen_fmt, expect); \
got = (fn)(test_buffer, &endp, base); \
pr_debug(#fn "(\"%s\", %d) -> " gen_fmt "\n", test_buffer, base, got); \
if (got != (expect)) { \
fail = true; \
pr_warn(#fn "(\"%s\", %d): got " gen_fmt " expected " gen_fmt "\n", \
test_buffer, base, got, expect); \
} else if (endp != test_buffer + len) { \
fail = true; \
pr_warn(#fn "(\"%s\", %d) startp=0x%px got endp=0x%px expected 0x%px\n", \
test_buffer, base, test_buffer, \
test_buffer + len, endp); \
} \
\
if (fail) \
failed_tests++; \
} while (0)
#define test_simple_strtoxx(T, fn, gen_fmt, base) \
do { \
int i; \
\
for (i = 0; i < ARRAY_SIZE(numbers); i++) { \
_test_simple_strtoxx(T, fn, gen_fmt, (T)numbers[i], base); \
\
if (is_signed_type(T)) \
_test_simple_strtoxx(T, fn, gen_fmt, \
-(T)numbers[i], base); \
} \
} while (0)
static void __init test_simple_strtoull(void)
{
test_simple_strtoxx(unsigned long long, simple_strtoull, "%llu", 10);
test_simple_strtoxx(unsigned long long, simple_strtoull, "%llu", 0);
test_simple_strtoxx(unsigned long long, simple_strtoull, "%llx", 16);
test_simple_strtoxx(unsigned long long, simple_strtoull, "0x%llx", 16);
test_simple_strtoxx(unsigned long long, simple_strtoull, "0x%llx", 0);
}
static void __init test_simple_strtoll(void)
{
test_simple_strtoxx(long long, simple_strtoll, "%lld", 10);
test_simple_strtoxx(long long, simple_strtoll, "%lld", 0);
test_simple_strtoxx(long long, simple_strtoll, "%llx", 16);
test_simple_strtoxx(long long, simple_strtoll, "0x%llx", 16);
test_simple_strtoxx(long long, simple_strtoll, "0x%llx", 0);
}
static void __init test_simple_strtoul(void)
{
test_simple_strtoxx(unsigned long, simple_strtoul, "%lu", 10);
test_simple_strtoxx(unsigned long, simple_strtoul, "%lu", 0);
test_simple_strtoxx(unsigned long, simple_strtoul, "%lx", 16);
test_simple_strtoxx(unsigned long, simple_strtoul, "0x%lx", 16);
test_simple_strtoxx(unsigned long, simple_strtoul, "0x%lx", 0);
}
static void __init test_simple_strtol(void)
{
test_simple_strtoxx(long, simple_strtol, "%ld", 10);
test_simple_strtoxx(long, simple_strtol, "%ld", 0);
test_simple_strtoxx(long, simple_strtol, "%lx", 16);
test_simple_strtoxx(long, simple_strtol, "0x%lx", 16);
test_simple_strtoxx(long, simple_strtol, "0x%lx", 0);
}
/* Selection of common delimiters/separators between numbers in a string. */
static const char * const number_delimiters[] __initconst = {
" ", ":", ",", "-", "/",
};
static void __init test_numbers(void)
{
int i;
/* String containing only one number. */
numbers_simple();
/* String with multiple numbers separated by delimiter. */
for (i = 0; i < ARRAY_SIZE(number_delimiters); i++) {
numbers_list(number_delimiters[i]);
/* Field width may be longer than actual field digits. */
numbers_list_field_width_typemax(number_delimiters[i]);
/* Each field width exactly length of actual field digits. */
numbers_list_field_width_val_width(number_delimiters[i]);
}
/* Slice continuous sequence of digits using field widths. */
numbers_slice();
numbers_prefix_overflow();
}
static void __init selftest(void)
{
test_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
if (!test_buffer)
return;
fmt_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
if (!fmt_buffer) {
kfree(test_buffer);
return;
}
prandom_seed_state(&rnd_state, 3141592653589793238ULL);
test_numbers();
test_simple_strtoull();
test_simple_strtoll();
test_simple_strtoul();
test_simple_strtol();
kfree(fmt_buffer);
kfree(test_buffer);
}
KSTM_MODULE_LOADERS(test_scanf);
MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
MODULE_LICENSE("GPL v2");
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