[linux-2.6-block.git] / lib / kstrtox.c

/*
 * 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/kernel.h>
#include <linux/math64.h>
#include <linux/export.h>
#include <linux/types.h>
#include <asm/uaccess.h>
#include "kstrtox.h"

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.
 * 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.
 */
unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *p)
{
	unsigned long long res;
	unsigned int rv;
	int overflow;

	res = 0;
	rv = 0;
	overflow = 0;
	while (*s) {
		unsigned int val;

		if ('0' <= *s && *s <= '9')
			val = *s - '0';
		else if ('a' <= _tolower(*s) && _tolower(*s) <= 'f')
			val = _tolower(*s) - '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))
				overflow = 1;
		}
		res = res * base + val;
		rv++;
		s++;
	}
	*p = res;
	if (overflow)
		rv |= KSTRTOX_OVERFLOW;
	return rv;
}

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.
 * Used as a replacement for the obsolete simple_strtoull. Return code must
 * be checked.
 */
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.
 * Used as a replacement for the obsolete simple_strtoull. Return code must
 * be checked.
 */
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 long)(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 long)(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.
 * Used as a replacement for the obsolete simple_strtoull. Return code must
 * be checked.
 */
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 long long)(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.
 * Used as a replacement for the obsolete simple_strtoull. Return code must
 * be checked.
 */
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 != (long long)(int)tmp)
		return -ERANGE;
	*res = tmp;
	return 0;
}
EXPORT_SYMBOL(kstrtoint);

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 != (unsigned long long)(u16)tmp)
		return -ERANGE;
	*res = tmp;
	return 0;
}
EXPORT_SYMBOL(kstrtou16);

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 != (long long)(s16)tmp)
		return -ERANGE;
	*res = tmp;
	return 0;
}
EXPORT_SYMBOL(kstrtos16);

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 != (unsigned long long)(u8)tmp)
		return -ERANGE;
	*res = tmp;
	return 0;
}
EXPORT_SYMBOL(kstrtou8);

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 != (long long)(s8)tmp)
		return -ERANGE;
	*res = tmp;
	return 0;
}
EXPORT_SYMBOL(kstrtos8);

#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);
Commit	Line	Data
33ee3b2e AD	1	/*
	2	* Convert integer string representation to an integer.
	3	* If an integer doesn't fit into specified type, -E is returned.
	4	*
	5	* Integer starts with optional sign.
	6	* kstrtou*() functions do not accept sign "-".
	7	*
	8	* Radix 0 means autodetection: leading "0x" implies radix 16,
	9	* leading "0" implies radix 8, otherwise radix is 10.
	10	* Autodetection hints work after optional sign, but not before.
	11	*
	12	* If -E is returned, result is not touched.
	13	*/
	14	#include <linux/ctype.h>
	15	#include <linux/errno.h>
	16	#include <linux/kernel.h>
	17	#include <linux/math64.h>
8bc3bcc9	18	#include <linux/export.h>
33ee3b2e	19	#include <linux/types.h>
c196e32a	20	#include <asm/uaccess.h>
1dff46d6	21	#include "kstrtox.h"
33ee3b2e	22
1dff46d6	23	const char _parse_integer_fixup_radix(const char s, unsigned int *base)
33ee3b2e	24	{
1dff46d6	25	if (*base == 0) {
33ee3b2e AD	26	if (s[0] == '0') {
33ee3b2e AD	27	if (_tolower(s[1]) == 'x' && isxdigit(s[2]))
1dff46d6	28	*base = 16;
33ee3b2e	29	else
1dff46d6	30	*base = 8;
33ee3b2e	31	} else
1dff46d6	32	*base = 10;
33ee3b2e	33	}
1dff46d6	34	if (*base == 16 && s[0] == '0' && _tolower(s[1]) == 'x')
33ee3b2e	35	s += 2;
1dff46d6 AD	36	return s;
	37	}
	38
	39	/*
	40	* Convert non-negative integer string representation in explicitly given radix
	41	* to an integer.
	42	* Return number of characters consumed maybe or-ed with overflow bit.
	43	* If overflow occurs, result integer (incorrect) is still returned.
	44	*
	45	* Don't you dare use this function.
	46	*/
690d137f	47	unsigned int _parse_integer(const char s, unsigned int base, unsigned long long p)
1dff46d6	48	{
690d137f	49	unsigned long long res;
1dff46d6 AD	50	unsigned int rv;
1dff46d6 AD	51	int overflow;
33ee3b2e	52
690d137f	53	res = 0;
1dff46d6 AD	54	rv = 0;
1dff46d6 AD	55	overflow = 0;
33ee3b2e AD	56	while (*s) {
	57	unsigned int val;
	58
	59	if ('0' <= s && s <= '9')
	60	val = *s - '0';
	61	else if ('a' <= _tolower(s) && _tolower(s) <= 'f')
	62	val = _tolower(*s) - 'a' + 10;
78be959e	63	else
1dff46d6	64	break;
33ee3b2e AD	65
33ee3b2e AD	66	if (val >= base)
1dff46d6	67	break;
690d137f DH	68	/*
	69	* Check for overflow only if we are within range of
	70	* it in the max base we support (16)
	71	*/
	72	if (unlikely(res & (~0ull << 60))) {
	73	if (res > div_u64(ULLONG_MAX - val, base))
	74	overflow = 1;
	75	}
	76	res = res * base + val;
1dff46d6	77	rv++;
33ee3b2e AD	78	s++;
33ee3b2e AD	79	}
690d137f	80	*p = res;
1dff46d6 AD	81	if (overflow)
	82	rv \|= KSTRTOX_OVERFLOW;
	83	return rv;
	84	}
	85
	86	static int _kstrtoull(const char s, unsigned int base, unsigned long long res)
	87	{
	88	unsigned long long _res;
	89	unsigned int rv;
	90
	91	s = _parse_integer_fixup_radix(s, &base);
	92	rv = _parse_integer(s, base, &_res);
	93	if (rv & KSTRTOX_OVERFLOW)
	94	return -ERANGE;
1dff46d6 AD	95	if (rv == 0)
	96	return -EINVAL;
	97	s += rv;
	98	if (*s == '\n')
	99	s++;
	100	if (*s)
33ee3b2e	101	return -EINVAL;
1dff46d6	102	*res = _res;
33ee3b2e AD	103	return 0;
	104	}
	105
4c925d60 EZ	106	/**
	107	* kstrtoull - convert a string to an unsigned long long
	108	* @s: The start of the string. The string must be null-terminated, and may also
	109	* include a single newline before its terminating null. The first character
	110	* may also be a plus sign, but not a minus sign.
	111	* @base: The number base to use. The maximum supported base is 16. If base is
	112	* given as 0, then the base of the string is automatically detected with the
	113	* conventional semantics - If it begins with 0x the number will be parsed as a
	114	* hexadecimal (case insensitive), if it otherwise begins with 0, it will be
	115	* parsed as an octal number. Otherwise it will be parsed as a decimal.
	116	* @res: Where to write the result of the conversion on success.
	117	*
	118	* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
	119	* Used as a replacement for the obsolete simple_strtoull. Return code must
	120	* be checked.
	121	*/
33ee3b2e AD	122	int kstrtoull(const char s, unsigned int base, unsigned long long res)
	123	{
	124	if (s[0] == '+')
	125	s++;
	126	return _kstrtoull(s, base, res);
	127	}
	128	EXPORT_SYMBOL(kstrtoull);
	129
4c925d60 EZ	130	/**
	131	* kstrtoll - convert a string to a long long
	132	* @s: The start of the string. The string must be null-terminated, and may also
	133	* include a single newline before its terminating null. The first character
	134	* may also be a plus sign or a minus sign.
	135	* @base: The number base to use. The maximum supported base is 16. If base is
	136	* given as 0, then the base of the string is automatically detected with the
	137	* conventional semantics - If it begins with 0x the number will be parsed as a
	138	* hexadecimal (case insensitive), if it otherwise begins with 0, it will be
	139	* parsed as an octal number. Otherwise it will be parsed as a decimal.
	140	* @res: Where to write the result of the conversion on success.
	141	*
	142	* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
	143	* Used as a replacement for the obsolete simple_strtoull. Return code must
	144	* be checked.
	145	*/
33ee3b2e AD	146	int kstrtoll(const char s, unsigned int base, long long res)
	147	{
	148	unsigned long long tmp;
	149	int rv;
	150
	151	if (s[0] == '-') {
	152	rv = _kstrtoull(s + 1, base, &tmp);
	153	if (rv < 0)
	154	return rv;
2d2e4715	155	if ((long long)-tmp > 0)
33ee3b2e AD	156	return -ERANGE;
	157	*res = -tmp;
	158	} else {
	159	rv = kstrtoull(s, base, &tmp);
	160	if (rv < 0)
	161	return rv;
	162	if ((long long)tmp < 0)
	163	return -ERANGE;
	164	*res = tmp;
	165	}
	166	return 0;
	167	}
	168	EXPORT_SYMBOL(kstrtoll);
	169
	170	/* Internal, do not use. */
	171	int _kstrtoul(const char s, unsigned int base, unsigned long res)
	172	{
	173	unsigned long long tmp;
	174	int rv;
	175
	176	rv = kstrtoull(s, base, &tmp);
	177	if (rv < 0)
	178	return rv;
	179	if (tmp != (unsigned long long)(unsigned long)tmp)
	180	return -ERANGE;
	181	*res = tmp;
	182	return 0;
	183	}
	184	EXPORT_SYMBOL(_kstrtoul);
	185
	186	/* Internal, do not use. */
	187	int _kstrtol(const char s, unsigned int base, long res)
	188	{
	189	long long tmp;
	190	int rv;
	191
	192	rv = kstrtoll(s, base, &tmp);
	193	if (rv < 0)
	194	return rv;
	195	if (tmp != (long long)(long)tmp)
	196	return -ERANGE;
	197	*res = tmp;
	198	return 0;
	199	}
	200	EXPORT_SYMBOL(_kstrtol);
	201
4c925d60 EZ	202	/**
	203	* kstrtouint - convert a string to an unsigned int
	204	* @s: The start of the string. The string must be null-terminated, and may also
	205	* include a single newline before its terminating null. The first character
	206	* may also be a plus sign, but not a minus sign.
	207	* @base: The number base to use. The maximum supported base is 16. If base is
	208	* given as 0, then the base of the string is automatically detected with the
	209	* conventional semantics - If it begins with 0x the number will be parsed as a
	210	* hexadecimal (case insensitive), if it otherwise begins with 0, it will be
	211	* parsed as an octal number. Otherwise it will be parsed as a decimal.
	212	* @res: Where to write the result of the conversion on success.
	213	*
	214	* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
	215	* Used as a replacement for the obsolete simple_strtoull. Return code must
	216	* be checked.
	217	*/
33ee3b2e AD	218	int kstrtouint(const char s, unsigned int base, unsigned int res)
	219	{
	220	unsigned long long tmp;
	221	int rv;
	222
	223	rv = kstrtoull(s, base, &tmp);
	224	if (rv < 0)
	225	return rv;
	226	if (tmp != (unsigned long long)(unsigned int)tmp)
	227	return -ERANGE;
	228	*res = tmp;
	229	return 0;
	230	}
	231	EXPORT_SYMBOL(kstrtouint);
	232
4c925d60 EZ	233	/**
	234	* kstrtoint - convert a string to an int
	235	* @s: The start of the string. The string must be null-terminated, and may also
	236	* include a single newline before its terminating null. The first character
	237	* may also be a plus sign or a minus sign.
	238	* @base: The number base to use. The maximum supported base is 16. If base is
	239	* given as 0, then the base of the string is automatically detected with the
	240	* conventional semantics - If it begins with 0x the number will be parsed as a
	241	* hexadecimal (case insensitive), if it otherwise begins with 0, it will be
	242	* parsed as an octal number. Otherwise it will be parsed as a decimal.
	243	* @res: Where to write the result of the conversion on success.
	244	*
	245	* Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
	246	* Used as a replacement for the obsolete simple_strtoull. Return code must
	247	* be checked.
	248	*/
33ee3b2e AD	249	int kstrtoint(const char s, unsigned int base, int res)
	250	{
	251	long long tmp;
	252	int rv;
	253
	254	rv = kstrtoll(s, base, &tmp);
	255	if (rv < 0)
	256	return rv;
	257	if (tmp != (long long)(int)tmp)
	258	return -ERANGE;
	259	*res = tmp;
	260	return 0;
	261	}
	262	EXPORT_SYMBOL(kstrtoint);
	263
	264	int kstrtou16(const char s, unsigned int base, u16 res)
	265	{
	266	unsigned long long tmp;
	267	int rv;
	268
	269	rv = kstrtoull(s, base, &tmp);
	270	if (rv < 0)
	271	return rv;
	272	if (tmp != (unsigned long long)(u16)tmp)
	273	return -ERANGE;
	274	*res = tmp;
	275	return 0;
	276	}
	277	EXPORT_SYMBOL(kstrtou16);
	278
	279	int kstrtos16(const char s, unsigned int base, s16 res)
	280	{
	281	long long tmp;
	282	int rv;
	283
	284	rv = kstrtoll(s, base, &tmp);
	285	if (rv < 0)
	286	return rv;
	287	if (tmp != (long long)(s16)tmp)
	288	return -ERANGE;
	289	*res = tmp;
	290	return 0;
	291	}
	292	EXPORT_SYMBOL(kstrtos16);
	293
	294	int kstrtou8(const char s, unsigned int base, u8 res)
	295	{
	296	unsigned long long tmp;
	297	int rv;
	298
	299	rv = kstrtoull(s, base, &tmp);
	300	if (rv < 0)
	301	return rv;
	302	if (tmp != (unsigned long long)(u8)tmp)
	303	return -ERANGE;
	304	*res = tmp;
	305	return 0;
	306	}
	307	EXPORT_SYMBOL(kstrtou8);
	308
	309	int kstrtos8(const char s, unsigned int base, s8 res)
	310	{
	311	long long tmp;
	312	int rv;
313
314	rv = kstrtoll(s, base, &tmp);
315	if (rv < 0)
316	return rv;
317	if (tmp != (long long)(s8)tmp)
318	return -ERANGE;
319	*res = tmp;
320	return 0;
321	}
322	EXPORT_SYMBOL(kstrtos8);
c196e32a AD	323
	324	#define kstrto_from_user(f, g, type) \
	325	int f(const char __user s, size_t count, unsigned int base, type res) \
	326	{ \
	327	/* sign, base 2 representation, newline, terminator */ \
	328	char buf[1 + sizeof(type) * 8 + 1 + 1]; \
	329	\
	330	count = min(count, sizeof(buf) - 1); \
	331	if (copy_from_user(buf, s, count)) \
	332	return -EFAULT; \
	333	buf[count] = '\0'; \
	334	return g(buf, base, res); \
	335	} \
	336	EXPORT_SYMBOL(f)
	337
	338	kstrto_from_user(kstrtoull_from_user, kstrtoull, unsigned long long);
	339	kstrto_from_user(kstrtoll_from_user, kstrtoll, long long);
	340	kstrto_from_user(kstrtoul_from_user, kstrtoul, unsigned long);
	341	kstrto_from_user(kstrtol_from_user, kstrtol, long);
	342	kstrto_from_user(kstrtouint_from_user, kstrtouint, unsigned int);
	343	kstrto_from_user(kstrtoint_from_user, kstrtoint, int);
	344	kstrto_from_user(kstrtou16_from_user, kstrtou16, u16);
	345	kstrto_from_user(kstrtos16_from_user, kstrtos16, s16);
	346	kstrto_from_user(kstrtou8_from_user, kstrtou8, u8);
	347	kstrto_from_user(kstrtos8_from_user, kstrtos8, s8);