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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - lib/kstrtox.c
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/export.h>
19 #include <linux/types.h>
20 #include <asm/uaccess.h>
23 const char *_parse_integer_fixup_radix(const char *s
, unsigned int *base
)
27 if (_tolower(s
[1]) == 'x' && isxdigit(s
[2]))
34 if (*base
== 16 && s
[0] == '0' && _tolower(s
[1]) == 'x')
40 * Convert non-negative integer string representation in explicitly given radix
42 * Return number of characters consumed maybe or-ed with overflow bit.
43 * If overflow occurs, result integer (incorrect) is still returned.
45 * Don't you dare use this function.
47 unsigned int _parse_integer(const char *s
, unsigned int base
, unsigned long long *p
)
49 unsigned long long res
;
59 if ('0' <= *s
&& *s
<= '9')
61 else if ('a' <= _tolower(*s
) && _tolower(*s
) <= 'f')
62 val
= _tolower(*s
) - 'a' + 10;
69 * Check for overflow only if we are within range of
70 * it in the max base we support (16)
72 if (unlikely(res
& (~0ull << 60))) {
73 if (res
> div_u64(ULLONG_MAX
- val
, base
))
76 res
= res
* base
+ val
;
82 rv
|= KSTRTOX_OVERFLOW
;
86 static int _kstrtoull(const char *s
, unsigned int base
, unsigned long long *res
)
88 unsigned long long _res
;
91 s
= _parse_integer_fixup_radix(s
, &base
);
92 rv
= _parse_integer(s
, base
, &_res
);
93 if (rv
& KSTRTOX_OVERFLOW
)
95 rv
&= ~KSTRTOX_OVERFLOW
;
107 int kstrtoull(const char *s
, unsigned int base
, unsigned long long *res
)
111 return _kstrtoull(s
, base
, res
);
113 EXPORT_SYMBOL(kstrtoull
);
115 int kstrtoll(const char *s
, unsigned int base
, long long *res
)
117 unsigned long long tmp
;
121 rv
= _kstrtoull(s
+ 1, base
, &tmp
);
124 if ((long long)(-tmp
) >= 0)
128 rv
= kstrtoull(s
, base
, &tmp
);
131 if ((long long)tmp
< 0)
137 EXPORT_SYMBOL(kstrtoll
);
139 /* Internal, do not use. */
140 int _kstrtoul(const char *s
, unsigned int base
, unsigned long *res
)
142 unsigned long long tmp
;
145 rv
= kstrtoull(s
, base
, &tmp
);
148 if (tmp
!= (unsigned long long)(unsigned long)tmp
)
153 EXPORT_SYMBOL(_kstrtoul
);
155 /* Internal, do not use. */
156 int _kstrtol(const char *s
, unsigned int base
, long *res
)
161 rv
= kstrtoll(s
, base
, &tmp
);
164 if (tmp
!= (long long)(long)tmp
)
169 EXPORT_SYMBOL(_kstrtol
);
171 int kstrtouint(const char *s
, unsigned int base
, unsigned int *res
)
173 unsigned long long tmp
;
176 rv
= kstrtoull(s
, base
, &tmp
);
179 if (tmp
!= (unsigned long long)(unsigned int)tmp
)
184 EXPORT_SYMBOL(kstrtouint
);
186 int kstrtoint(const char *s
, unsigned int base
, int *res
)
191 rv
= kstrtoll(s
, base
, &tmp
);
194 if (tmp
!= (long long)(int)tmp
)
199 EXPORT_SYMBOL(kstrtoint
);
201 int kstrtou16(const char *s
, unsigned int base
, u16
*res
)
203 unsigned long long tmp
;
206 rv
= kstrtoull(s
, base
, &tmp
);
209 if (tmp
!= (unsigned long long)(u16
)tmp
)
214 EXPORT_SYMBOL(kstrtou16
);
216 int kstrtos16(const char *s
, unsigned int base
, s16
*res
)
221 rv
= kstrtoll(s
, base
, &tmp
);
224 if (tmp
!= (long long)(s16
)tmp
)
229 EXPORT_SYMBOL(kstrtos16
);
231 int kstrtou8(const char *s
, unsigned int base
, u8
*res
)
233 unsigned long long tmp
;
236 rv
= kstrtoull(s
, base
, &tmp
);
239 if (tmp
!= (unsigned long long)(u8
)tmp
)
244 EXPORT_SYMBOL(kstrtou8
);
246 int kstrtos8(const char *s
, unsigned int base
, s8
*res
)
251 rv
= kstrtoll(s
, base
, &tmp
);
254 if (tmp
!= (long long)(s8
)tmp
)
259 EXPORT_SYMBOL(kstrtos8
);
261 #define kstrto_from_user(f, g, type) \
262 int f(const char __user *s, size_t count, unsigned int base, type *res) \
264 /* sign, base 2 representation, newline, terminator */ \
265 char buf[1 + sizeof(type) * 8 + 1 + 1]; \
267 count = min(count, sizeof(buf) - 1); \
268 if (copy_from_user(buf, s, count)) \
271 return g(buf, base, res); \
275 kstrto_from_user(kstrtoull_from_user
, kstrtoull
, unsigned long long);
276 kstrto_from_user(kstrtoll_from_user
, kstrtoll
, long long);
277 kstrto_from_user(kstrtoul_from_user
, kstrtoul
, unsigned long);
278 kstrto_from_user(kstrtol_from_user
, kstrtol
, long);
279 kstrto_from_user(kstrtouint_from_user
, kstrtouint
, unsigned int);
280 kstrto_from_user(kstrtoint_from_user
, kstrtoint
, int);
281 kstrto_from_user(kstrtou16_from_user
, kstrtou16
, u16
);
282 kstrto_from_user(kstrtos16_from_user
, kstrtos16
, s16
);
283 kstrto_from_user(kstrtou8_from_user
, kstrtou8
, u8
);
284 kstrto_from_user(kstrtos8_from_user
, kstrtos8
, s8
);