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.
15 #include <linux/ctype.h>
16 #include <linux/kernel.h>
17 #include <linux/math64.h>
18 #include <linux/export.h>
19 #include <linux/types.h>
22 #define KSTRTOX_OVERFLOW (1U << 31)
24 const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
28 if (_tolower(s[1]) == 'x' && isxdigit(s[2]))
35 if (*base == 16 && s[0] == '0' && _tolower(s[1]) == 'x')
41 * Convert non-negative integer string representation in explicitly given radix
43 * Return number of characters consumed maybe or-ed with overflow bit.
44 * If overflow occurs, result integer (incorrect) is still returned.
46 * Don't you dare use this function.
48 unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *p)
50 unsigned long long res;
60 if ('0' <= *s && *s <= '9')
62 else if ('a' <= _tolower(*s) && _tolower(*s) <= 'f')
63 val = _tolower(*s) - 'a' + 10;
70 * Check for overflow only if we are within range of
71 * it in the max base we support (16)
73 if (unlikely(res & (~0ull << 60))) {
74 if (res > div_u64(ULLONG_MAX - val, base))
77 res = res * base + val;
83 rv |= KSTRTOX_OVERFLOW;
87 static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
89 unsigned long long _res;
92 s = _parse_integer_fixup_radix(s, &base);
93 rv = _parse_integer(s, base, &_res);
94 if (rv & KSTRTOX_OVERFLOW)
108 * kstrtoull - convert a string to an unsigned long long
109 * @s: The start of the string. The string must be null-terminated, and may also
110 * include a single newline before its terminating null. The first character
111 * may also be a plus sign, but not a minus sign.
112 * @base: The number base to use. The maximum supported base is 16. If base is
113 * given as 0, then the base of the string is automatically detected with the
114 * conventional semantics - If it begins with 0x the number will be parsed as a
115 * hexadecimal (case insensitive), if it otherwise begins with 0, it will be
116 * parsed as an octal number. Otherwise it will be parsed as a decimal.
117 * @res: Where to write the result of the conversion on success.
119 * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
120 * Used as a replacement for the obsolete simple_strtoull. Return code must
123 int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
127 return _kstrtoull(s, base, res);
129 EXPORT_SYMBOL(kstrtoull);
132 * kstrtoll - convert a string to a long long
133 * @s: The start of the string. The string must be null-terminated, and may also
134 * include a single newline before its terminating null. The first character
135 * may also be a plus sign or a minus sign.
136 * @base: The number base to use. The maximum supported base is 16. If base is
137 * given as 0, then the base of the string is automatically detected with the
138 * conventional semantics - If it begins with 0x the number will be parsed as a
139 * hexadecimal (case insensitive), if it otherwise begins with 0, it will be
140 * parsed as an octal number. Otherwise it will be parsed as a decimal.
141 * @res: Where to write the result of the conversion on success.
143 * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
144 * Used as a replacement for the obsolete simple_strtoull. Return code must
147 int kstrtoll(const char *s, unsigned int base, long long *res)
149 unsigned long long tmp;
153 rv = _kstrtoull(s + 1, base, &tmp);
156 if ((long long)-tmp > 0)
160 rv = kstrtoull(s, base, &tmp);
163 if ((long long)tmp < 0)
169 EXPORT_SYMBOL(kstrtoll);
171 /* Internal, do not use. */
172 int _kstrtoul(const char *s, unsigned int base, unsigned long *res)
174 unsigned long long tmp;
177 rv = kstrtoull(s, base, &tmp);
180 if (tmp != (unsigned long long)(unsigned long)tmp)
185 EXPORT_SYMBOL(_kstrtoul);
187 /* Internal, do not use. */
188 int _kstrtol(const char *s, unsigned int base, long *res)
193 rv = kstrtoll(s, base, &tmp);
196 if (tmp != (long long)(long)tmp)
201 EXPORT_SYMBOL(_kstrtol);
204 * kstrtouint - convert a string to an unsigned int
205 * @s: The start of the string. The string must be null-terminated, and may also
206 * include a single newline before its terminating null. The first character
207 * may also be a plus sign, but not a minus sign.
208 * @base: The number base to use. The maximum supported base is 16. If base is
209 * given as 0, then the base of the string is automatically detected with the
210 * conventional semantics - If it begins with 0x the number will be parsed as a
211 * hexadecimal (case insensitive), if it otherwise begins with 0, it will be
212 * parsed as an octal number. Otherwise it will be parsed as a decimal.
213 * @res: Where to write the result of the conversion on success.
215 * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
216 * Used as a replacement for the obsolete simple_strtoull. Return code must
219 int kstrtouint(const char *s, unsigned int base, unsigned int *res)
221 unsigned long long tmp;
224 rv = kstrtoull(s, base, &tmp);
227 if (tmp != (unsigned long long)(unsigned int)tmp)
232 EXPORT_SYMBOL(kstrtouint);
235 * kstrtoint - convert a string to an int
236 * @s: The start of the string. The string must be null-terminated, and may also
237 * include a single newline before its terminating null. The first character
238 * may also be a plus sign or a minus sign.
239 * @base: The number base to use. The maximum supported base is 16. If base is
240 * given as 0, then the base of the string is automatically detected with the
241 * conventional semantics - If it begins with 0x the number will be parsed as a
242 * hexadecimal (case insensitive), if it otherwise begins with 0, it will be
243 * parsed as an octal number. Otherwise it will be parsed as a decimal.
244 * @res: Where to write the result of the conversion on success.
246 * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
247 * Used as a replacement for the obsolete simple_strtoull. Return code must
250 int kstrtoint(const char *s, unsigned int base, int *res)
255 rv = kstrtoll(s, base, &tmp);
258 if (tmp != (long long)(int)tmp)
263 EXPORT_SYMBOL(kstrtoint);
265 int kstrtou16(const char *s, unsigned int base, u16 *res)
267 unsigned long long tmp;
270 rv = kstrtoull(s, base, &tmp);
273 if (tmp != (unsigned long long)(u16)tmp)
278 EXPORT_SYMBOL(kstrtou16);
280 int kstrtos16(const char *s, unsigned int base, s16 *res)
285 rv = kstrtoll(s, base, &tmp);
288 if (tmp != (long long)(s16)tmp)
293 EXPORT_SYMBOL(kstrtos16);
295 int kstrtou8(const char *s, unsigned int base, u8 *res)
297 unsigned long long tmp;
300 rv = kstrtoull(s, base, &tmp);
303 if (tmp != (unsigned long long)(u8)tmp)
308 EXPORT_SYMBOL(kstrtou8);
310 int kstrtos8(const char *s, unsigned int base, s8 *res)
315 rv = kstrtoll(s, base, &tmp);
318 if (tmp != (long long)(s8)tmp)
323 EXPORT_SYMBOL(kstrtos8);
326 * kstrtobool - convert common user inputs into boolean values
330 * This routine returns 0 iff the first character is one of 'Yy1Nn0', or
331 * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL. Value
332 * pointed to by res is updated upon finding a match.
334 int kstrtobool(const char *s, bool *res)
370 EXPORT_SYMBOL(kstrtobool);