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>
20 #include <asm/uaccess.h>
22 static inline char _tolower(const char c)
27 static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
29 unsigned long long acc;
34 if (_tolower(s[1]) == 'x' && isxdigit(s[2]))
41 if (base == 16 && s[0] == '0' && _tolower(s[1]) == 'x')
49 if ('0' <= *s && *s <= '9')
51 else if ('a' <= _tolower(*s) && _tolower(*s) <= 'f')
52 val = _tolower(*s) - 'a' + 10;
53 else if (*s == '\n' && *(s + 1) == '\0')
60 if (acc > div_u64(ULLONG_MAX - val, base))
62 acc = acc * base + val;
73 int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
77 return _kstrtoull(s, base, res);
79 EXPORT_SYMBOL(kstrtoull);
81 int kstrtoll(const char *s, unsigned int base, long long *res)
83 unsigned long long tmp;
87 rv = _kstrtoull(s + 1, base, &tmp);
90 if ((long long)(-tmp) >= 0)
94 rv = kstrtoull(s, base, &tmp);
97 if ((long long)tmp < 0)
103 EXPORT_SYMBOL(kstrtoll);
105 /* Internal, do not use. */
106 int _kstrtoul(const char *s, unsigned int base, unsigned long *res)
108 unsigned long long tmp;
111 rv = kstrtoull(s, base, &tmp);
114 if (tmp != (unsigned long long)(unsigned long)tmp)
119 EXPORT_SYMBOL(_kstrtoul);
121 /* Internal, do not use. */
122 int _kstrtol(const char *s, unsigned int base, long *res)
127 rv = kstrtoll(s, base, &tmp);
130 if (tmp != (long long)(long)tmp)
135 EXPORT_SYMBOL(_kstrtol);
137 int kstrtouint(const char *s, unsigned int base, unsigned int *res)
139 unsigned long long tmp;
142 rv = kstrtoull(s, base, &tmp);
145 if (tmp != (unsigned long long)(unsigned int)tmp)
150 EXPORT_SYMBOL(kstrtouint);
152 int kstrtoint(const char *s, unsigned int base, int *res)
157 rv = kstrtoll(s, base, &tmp);
160 if (tmp != (long long)(int)tmp)
165 EXPORT_SYMBOL(kstrtoint);
167 int kstrtou16(const char *s, unsigned int base, u16 *res)
169 unsigned long long tmp;
172 rv = kstrtoull(s, base, &tmp);
175 if (tmp != (unsigned long long)(u16)tmp)
180 EXPORT_SYMBOL(kstrtou16);
182 int kstrtos16(const char *s, unsigned int base, s16 *res)
187 rv = kstrtoll(s, base, &tmp);
190 if (tmp != (long long)(s16)tmp)
195 EXPORT_SYMBOL(kstrtos16);
197 int kstrtou8(const char *s, unsigned int base, u8 *res)
199 unsigned long long tmp;
202 rv = kstrtoull(s, base, &tmp);
205 if (tmp != (unsigned long long)(u8)tmp)
210 EXPORT_SYMBOL(kstrtou8);
212 int kstrtos8(const char *s, unsigned int base, s8 *res)
217 rv = kstrtoll(s, base, &tmp);
220 if (tmp != (long long)(s8)tmp)
225 EXPORT_SYMBOL(kstrtos8);
227 #define kstrto_from_user(f, g, type) \
228 int f(const char __user *s, size_t count, unsigned int base, type *res) \
230 /* sign, base 2 representation, newline, terminator */ \
231 char buf[1 + sizeof(type) * 8 + 1 + 1]; \
233 count = min(count, sizeof(buf) - 1); \
234 if (copy_from_user(buf, s, count)) \
237 return g(buf, base, res); \
241 kstrto_from_user(kstrtoull_from_user, kstrtoull, unsigned long long);
242 kstrto_from_user(kstrtoll_from_user, kstrtoll, long long);
243 kstrto_from_user(kstrtoul_from_user, kstrtoul, unsigned long);
244 kstrto_from_user(kstrtol_from_user, kstrtol, long);
245 kstrto_from_user(kstrtouint_from_user, kstrtouint, unsigned int);
246 kstrto_from_user(kstrtoint_from_user, kstrtoint, int);
247 kstrto_from_user(kstrtou16_from_user, kstrtou16, u16);
248 kstrto_from_user(kstrtos16_from_user, kstrtos16, s16);
249 kstrto_from_user(kstrtou8_from_user, kstrtou8, u8);
250 kstrto_from_user(kstrtos8_from_user, kstrtos8, s8);