2 * Convert integer string representation to an integer.
3 * If an integer doesn't fit into specified type, -E is returned.
5 * Integer starts with optional sign.
6 * kstrtou*() functions do not accept sign "-".
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.
12 * If -E is returned, result is not touched.
14 #include <linux/ctype.h>
15 #include <linux/errno.h>
16 #include <linux/kernel.h>
17 #include <linux/math64.h>
18 #include <linux/module.h>
19 #include <linux/types.h>
21 static inline char _tolower(const char c
)
26 static int _kstrtoull(const char *s
, unsigned int base
, unsigned long long *res
)
28 unsigned long long acc
;
33 if (_tolower(s
[1]) == 'x' && isxdigit(s
[2]))
40 if (base
== 16 && s
[0] == '0' && _tolower(s
[1]) == 'x')
48 if ('0' <= *s
&& *s
<= '9')
50 else if ('a' <= _tolower(*s
) && _tolower(*s
) <= 'f')
51 val
= _tolower(*s
) - 'a' + 10;
52 else if (*s
== '\n' && *(s
+ 1) == '\0')
59 if (acc
> div_u64(ULLONG_MAX
- val
, base
))
61 acc
= acc
* base
+ val
;
72 int kstrtoull(const char *s
, unsigned int base
, unsigned long long *res
)
76 return _kstrtoull(s
, base
, res
);
78 EXPORT_SYMBOL(kstrtoull
);
80 int kstrtoll(const char *s
, unsigned int base
, long long *res
)
82 unsigned long long tmp
;
86 rv
= _kstrtoull(s
+ 1, base
, &tmp
);
89 if ((long long)(-tmp
) >= 0)
93 rv
= kstrtoull(s
, base
, &tmp
);
96 if ((long long)tmp
< 0)
102 EXPORT_SYMBOL(kstrtoll
);
104 /* Internal, do not use. */
105 int _kstrtoul(const char *s
, unsigned int base
, unsigned long *res
)
107 unsigned long long tmp
;
110 rv
= kstrtoull(s
, base
, &tmp
);
113 if (tmp
!= (unsigned long long)(unsigned long)tmp
)
118 EXPORT_SYMBOL(_kstrtoul
);
120 /* Internal, do not use. */
121 int _kstrtol(const char *s
, unsigned int base
, long *res
)
126 rv
= kstrtoll(s
, base
, &tmp
);
129 if (tmp
!= (long long)(long)tmp
)
134 EXPORT_SYMBOL(_kstrtol
);
136 int kstrtouint(const char *s
, unsigned int base
, unsigned int *res
)
138 unsigned long long tmp
;
141 rv
= kstrtoull(s
, base
, &tmp
);
144 if (tmp
!= (unsigned long long)(unsigned int)tmp
)
149 EXPORT_SYMBOL(kstrtouint
);
151 int kstrtoint(const char *s
, unsigned int base
, int *res
)
156 rv
= kstrtoll(s
, base
, &tmp
);
159 if (tmp
!= (long long)(int)tmp
)
164 EXPORT_SYMBOL(kstrtoint
);
166 int kstrtou16(const char *s
, unsigned int base
, u16
*res
)
168 unsigned long long tmp
;
171 rv
= kstrtoull(s
, base
, &tmp
);
174 if (tmp
!= (unsigned long long)(u16
)tmp
)
179 EXPORT_SYMBOL(kstrtou16
);
181 int kstrtos16(const char *s
, unsigned int base
, s16
*res
)
186 rv
= kstrtoll(s
, base
, &tmp
);
189 if (tmp
!= (long long)(s16
)tmp
)
194 EXPORT_SYMBOL(kstrtos16
);
196 int kstrtou8(const char *s
, unsigned int base
, u8
*res
)
198 unsigned long long tmp
;
201 rv
= kstrtoull(s
, base
, &tmp
);
204 if (tmp
!= (unsigned long long)(u8
)tmp
)
209 EXPORT_SYMBOL(kstrtou8
);
211 int kstrtos8(const char *s
, unsigned int base
, s8
*res
)
216 rv
= kstrtoll(s
, base
, &tmp
);
219 if (tmp
!= (long long)(s8
)tmp
)
224 EXPORT_SYMBOL(kstrtos8
);
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