432 lines
11 KiB
C
432 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Convert integer string representation to an integer.
|
|
* If an integer doesn't fit into specified type, -E is returned.
|
|
*
|
|
* Integer starts with optional sign.
|
|
* kstrtou*() functions do not accept sign "-".
|
|
*
|
|
* Radix 0 means autodetection: leading "0x" implies radix 16,
|
|
* leading "0" implies radix 8, otherwise radix is 10.
|
|
* Autodetection hints work after optional sign, but not before.
|
|
*
|
|
* If -E is returned, result is not touched.
|
|
*/
|
|
#include <linux/ctype.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/export.h>
|
|
#include <linux/kstrtox.h>
|
|
#include <linux/math64.h>
|
|
#include <linux/types.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include "kstrtox.h"
|
|
|
|
noinline
|
|
const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
|
|
{
|
|
if (*base == 0) {
|
|
if (s[0] == '0') {
|
|
if (_tolower(s[1]) == 'x' && isxdigit(s[2]))
|
|
*base = 16;
|
|
else
|
|
*base = 8;
|
|
} else
|
|
*base = 10;
|
|
}
|
|
if (*base == 16 && s[0] == '0' && _tolower(s[1]) == 'x')
|
|
s += 2;
|
|
return s;
|
|
}
|
|
|
|
/*
|
|
* Convert non-negative integer string representation in explicitly given radix
|
|
* to an integer. A maximum of max_chars characters will be converted.
|
|
*
|
|
* Return number of characters consumed maybe or-ed with overflow bit.
|
|
* If overflow occurs, result integer (incorrect) is still returned.
|
|
*
|
|
* Don't you dare use this function.
|
|
*/
|
|
noinline
|
|
unsigned int _parse_integer_limit(const char *s, unsigned int base, unsigned long long *p,
|
|
size_t max_chars)
|
|
{
|
|
unsigned long long res;
|
|
unsigned int rv;
|
|
|
|
res = 0;
|
|
rv = 0;
|
|
while (max_chars--) {
|
|
unsigned int c = *s;
|
|
unsigned int lc = _tolower(c);
|
|
unsigned int val;
|
|
|
|
if ('0' <= c && c <= '9')
|
|
val = c - '0';
|
|
else if ('a' <= lc && lc <= 'f')
|
|
val = lc - 'a' + 10;
|
|
else
|
|
break;
|
|
|
|
if (val >= base)
|
|
break;
|
|
/*
|
|
* Check for overflow only if we are within range of
|
|
* it in the max base we support (16)
|
|
*/
|
|
if (unlikely(res & (~0ull << 60))) {
|
|
if (res > div_u64(ULLONG_MAX - val, base))
|
|
rv |= KSTRTOX_OVERFLOW;
|
|
}
|
|
res = res * base + val;
|
|
rv++;
|
|
s++;
|
|
}
|
|
*p = res;
|
|
return rv;
|
|
}
|
|
|
|
noinline
|
|
unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *p)
|
|
{
|
|
return _parse_integer_limit(s, base, p, INT_MAX);
|
|
}
|
|
|
|
static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
|
|
{
|
|
unsigned long long _res;
|
|
unsigned int rv;
|
|
|
|
s = _parse_integer_fixup_radix(s, &base);
|
|
rv = _parse_integer(s, base, &_res);
|
|
if (rv & KSTRTOX_OVERFLOW)
|
|
return -ERANGE;
|
|
if (rv == 0)
|
|
return -EINVAL;
|
|
s += rv;
|
|
if (*s == '\n')
|
|
s++;
|
|
if (*s)
|
|
return -EINVAL;
|
|
*res = _res;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* kstrtoull - convert a string to an unsigned long long
|
|
* @s: The start of the string. The string must be null-terminated, and may also
|
|
* include a single newline before its terminating null. The first character
|
|
* may also be a plus sign, but not a minus sign.
|
|
* @base: The number base to use. The maximum supported base is 16. If base is
|
|
* given as 0, then the base of the string is automatically detected with the
|
|
* conventional semantics - If it begins with 0x the number will be parsed as a
|
|
* hexadecimal (case insensitive), if it otherwise begins with 0, it will be
|
|
* parsed as an octal number. Otherwise it will be parsed as a decimal.
|
|
* @res: Where to write the result of the conversion on success.
|
|
*
|
|
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
|
|
* Preferred over simple_strtoull(). Return code must be checked.
|
|
*/
|
|
noinline
|
|
int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
|
|
{
|
|
if (s[0] == '+')
|
|
s++;
|
|
return _kstrtoull(s, base, res);
|
|
}
|
|
EXPORT_SYMBOL(kstrtoull);
|
|
|
|
/**
|
|
* kstrtoll - convert a string to a long long
|
|
* @s: The start of the string. The string must be null-terminated, and may also
|
|
* include a single newline before its terminating null. The first character
|
|
* may also be a plus sign or a minus sign.
|
|
* @base: The number base to use. The maximum supported base is 16. If base is
|
|
* given as 0, then the base of the string is automatically detected with the
|
|
* conventional semantics - If it begins with 0x the number will be parsed as a
|
|
* hexadecimal (case insensitive), if it otherwise begins with 0, it will be
|
|
* parsed as an octal number. Otherwise it will be parsed as a decimal.
|
|
* @res: Where to write the result of the conversion on success.
|
|
*
|
|
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
|
|
* Preferred over simple_strtoll(). Return code must be checked.
|
|
*/
|
|
noinline
|
|
int kstrtoll(const char *s, unsigned int base, long long *res)
|
|
{
|
|
unsigned long long tmp;
|
|
int rv;
|
|
|
|
if (s[0] == '-') {
|
|
rv = _kstrtoull(s + 1, base, &tmp);
|
|
if (rv < 0)
|
|
return rv;
|
|
if ((long long)-tmp > 0)
|
|
return -ERANGE;
|
|
*res = -tmp;
|
|
} else {
|
|
rv = kstrtoull(s, base, &tmp);
|
|
if (rv < 0)
|
|
return rv;
|
|
if ((long long)tmp < 0)
|
|
return -ERANGE;
|
|
*res = tmp;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(kstrtoll);
|
|
|
|
/* Internal, do not use. */
|
|
int _kstrtoul(const char *s, unsigned int base, unsigned long *res)
|
|
{
|
|
unsigned long long tmp;
|
|
int rv;
|
|
|
|
rv = kstrtoull(s, base, &tmp);
|
|
if (rv < 0)
|
|
return rv;
|
|
if (tmp != (unsigned long)tmp)
|
|
return -ERANGE;
|
|
*res = tmp;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(_kstrtoul);
|
|
|
|
/* Internal, do not use. */
|
|
int _kstrtol(const char *s, unsigned int base, long *res)
|
|
{
|
|
long long tmp;
|
|
int rv;
|
|
|
|
rv = kstrtoll(s, base, &tmp);
|
|
if (rv < 0)
|
|
return rv;
|
|
if (tmp != (long)tmp)
|
|
return -ERANGE;
|
|
*res = tmp;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(_kstrtol);
|
|
|
|
/**
|
|
* kstrtouint - convert a string to an unsigned int
|
|
* @s: The start of the string. The string must be null-terminated, and may also
|
|
* include a single newline before its terminating null. The first character
|
|
* may also be a plus sign, but not a minus sign.
|
|
* @base: The number base to use. The maximum supported base is 16. If base is
|
|
* given as 0, then the base of the string is automatically detected with the
|
|
* conventional semantics - If it begins with 0x the number will be parsed as a
|
|
* hexadecimal (case insensitive), if it otherwise begins with 0, it will be
|
|
* parsed as an octal number. Otherwise it will be parsed as a decimal.
|
|
* @res: Where to write the result of the conversion on success.
|
|
*
|
|
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
|
|
* Preferred over simple_strtoul(). Return code must be checked.
|
|
*/
|
|
noinline
|
|
int kstrtouint(const char *s, unsigned int base, unsigned int *res)
|
|
{
|
|
unsigned long long tmp;
|
|
int rv;
|
|
|
|
rv = kstrtoull(s, base, &tmp);
|
|
if (rv < 0)
|
|
return rv;
|
|
if (tmp != (unsigned int)tmp)
|
|
return -ERANGE;
|
|
*res = tmp;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(kstrtouint);
|
|
|
|
/**
|
|
* kstrtoint - convert a string to an int
|
|
* @s: The start of the string. The string must be null-terminated, and may also
|
|
* include a single newline before its terminating null. The first character
|
|
* may also be a plus sign or a minus sign.
|
|
* @base: The number base to use. The maximum supported base is 16. If base is
|
|
* given as 0, then the base of the string is automatically detected with the
|
|
* conventional semantics - If it begins with 0x the number will be parsed as a
|
|
* hexadecimal (case insensitive), if it otherwise begins with 0, it will be
|
|
* parsed as an octal number. Otherwise it will be parsed as a decimal.
|
|
* @res: Where to write the result of the conversion on success.
|
|
*
|
|
* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
|
|
* Preferred over simple_strtol(). Return code must be checked.
|
|
*/
|
|
noinline
|
|
int kstrtoint(const char *s, unsigned int base, int *res)
|
|
{
|
|
long long tmp;
|
|
int rv;
|
|
|
|
rv = kstrtoll(s, base, &tmp);
|
|
if (rv < 0)
|
|
return rv;
|
|
if (tmp != (int)tmp)
|
|
return -ERANGE;
|
|
*res = tmp;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(kstrtoint);
|
|
|
|
noinline
|
|
int kstrtou16(const char *s, unsigned int base, u16 *res)
|
|
{
|
|
unsigned long long tmp;
|
|
int rv;
|
|
|
|
rv = kstrtoull(s, base, &tmp);
|
|
if (rv < 0)
|
|
return rv;
|
|
if (tmp != (u16)tmp)
|
|
return -ERANGE;
|
|
*res = tmp;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(kstrtou16);
|
|
|
|
noinline
|
|
int kstrtos16(const char *s, unsigned int base, s16 *res)
|
|
{
|
|
long long tmp;
|
|
int rv;
|
|
|
|
rv = kstrtoll(s, base, &tmp);
|
|
if (rv < 0)
|
|
return rv;
|
|
if (tmp != (s16)tmp)
|
|
return -ERANGE;
|
|
*res = tmp;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(kstrtos16);
|
|
|
|
noinline
|
|
int kstrtou8(const char *s, unsigned int base, u8 *res)
|
|
{
|
|
unsigned long long tmp;
|
|
int rv;
|
|
|
|
rv = kstrtoull(s, base, &tmp);
|
|
if (rv < 0)
|
|
return rv;
|
|
if (tmp != (u8)tmp)
|
|
return -ERANGE;
|
|
*res = tmp;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(kstrtou8);
|
|
|
|
noinline
|
|
int kstrtos8(const char *s, unsigned int base, s8 *res)
|
|
{
|
|
long long tmp;
|
|
int rv;
|
|
|
|
rv = kstrtoll(s, base, &tmp);
|
|
if (rv < 0)
|
|
return rv;
|
|
if (tmp != (s8)tmp)
|
|
return -ERANGE;
|
|
*res = tmp;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(kstrtos8);
|
|
|
|
/**
|
|
* kstrtobool - convert common user inputs into boolean values
|
|
* @s: input string
|
|
* @res: result
|
|
*
|
|
* This routine returns 0 iff the first character is one of 'YyTt1NnFf0', or
|
|
* [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL. Value
|
|
* pointed to by res is updated upon finding a match.
|
|
*/
|
|
noinline
|
|
int kstrtobool(const char *s, bool *res)
|
|
{
|
|
if (!s)
|
|
return -EINVAL;
|
|
|
|
switch (s[0]) {
|
|
case 'y':
|
|
case 'Y':
|
|
case 't':
|
|
case 'T':
|
|
case '1':
|
|
*res = true;
|
|
return 0;
|
|
case 'n':
|
|
case 'N':
|
|
case 'f':
|
|
case 'F':
|
|
case '0':
|
|
*res = false;
|
|
return 0;
|
|
case 'o':
|
|
case 'O':
|
|
switch (s[1]) {
|
|
case 'n':
|
|
case 'N':
|
|
*res = true;
|
|
return 0;
|
|
case 'f':
|
|
case 'F':
|
|
*res = false;
|
|
return 0;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(kstrtobool);
|
|
|
|
/*
|
|
* Since "base" would be a nonsense argument, this open-codes the
|
|
* _from_user helper instead of using the helper macro below.
|
|
*/
|
|
int kstrtobool_from_user(const char __user *s, size_t count, bool *res)
|
|
{
|
|
/* Longest string needed to differentiate, newline, terminator */
|
|
char buf[4];
|
|
|
|
count = min(count, sizeof(buf) - 1);
|
|
if (copy_from_user(buf, s, count))
|
|
return -EFAULT;
|
|
buf[count] = '\0';
|
|
return kstrtobool(buf, res);
|
|
}
|
|
EXPORT_SYMBOL(kstrtobool_from_user);
|
|
|
|
#define kstrto_from_user(f, g, type) \
|
|
int f(const char __user *s, size_t count, unsigned int base, type *res) \
|
|
{ \
|
|
/* sign, base 2 representation, newline, terminator */ \
|
|
char buf[1 + sizeof(type) * 8 + 1 + 1]; \
|
|
\
|
|
count = min(count, sizeof(buf) - 1); \
|
|
if (copy_from_user(buf, s, count)) \
|
|
return -EFAULT; \
|
|
buf[count] = '\0'; \
|
|
return g(buf, base, res); \
|
|
} \
|
|
EXPORT_SYMBOL(f)
|
|
|
|
kstrto_from_user(kstrtoull_from_user, kstrtoull, unsigned long long);
|
|
kstrto_from_user(kstrtoll_from_user, kstrtoll, long long);
|
|
kstrto_from_user(kstrtoul_from_user, kstrtoul, unsigned long);
|
|
kstrto_from_user(kstrtol_from_user, kstrtol, long);
|
|
kstrto_from_user(kstrtouint_from_user, kstrtouint, unsigned int);
|
|
kstrto_from_user(kstrtoint_from_user, kstrtoint, int);
|
|
kstrto_from_user(kstrtou16_from_user, kstrtou16, u16);
|
|
kstrto_from_user(kstrtos16_from_user, kstrtos16, s16);
|
|
kstrto_from_user(kstrtou8_from_user, kstrtou8, u8);
|
|
kstrto_from_user(kstrtos8_from_user, kstrtos8, s8);
|