1 // SPDX-License-Identifier: GPL-2.0
4  * If an integer doesn't fit into specified type, -E is returned.
7  * kstrtou*() functions do not accept sign "-".
13  * If -E is returned, result is not touched.
41  * Convert non-negative integer string representation in explicitly given radix
43  * Return number of characters consumed maybe or-ed with overflow bit.
46  * Don't you dare use this function.
61 			val = c - '0';  in _parse_integer()
63 			val = lc - 'a' + 10;  in _parse_integer()
74 			if (res > div_u64(ULLONG_MAX - val, base))  in _parse_integer()
93 		return -ERANGE;  in _kstrtoull()
95 		return -EINVAL;  in _kstrtoull()
100 		return -EINVAL;  in _kstrtoull()
106  * kstrtoull - convert a string to an unsigned long long
107  * @s: The start of the string. The string must be null-terminated, and may also
110  * @base: The number base to use. The maximum supported base is 16. If base is
112  *  conventional semantics - If it begins with 0x the number will be parsed as a
113  *  hexadecimal (case insensitive), if it otherwise begins with 0, it will be
117  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
129  * kstrtoll - convert a string to a long long
130  * @s: The start of the string. The string must be null-terminated, and may also
133  * @base: The number base to use. The maximum supported base is 16. If base is
135  *  conventional semantics - If it begins with 0x the number will be parsed as a
136  *  hexadecimal (case insensitive), if it otherwise begins with 0, it will be
140  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
148 	if (s[0] == '-') {  in kstrtoll()
152 		if ((long long)-tmp > 0)  in kstrtoll()
153 			return -ERANGE;  in kstrtoll()
154 		*res = -tmp;  in kstrtoll()
160 			return -ERANGE;  in kstrtoll()
167 /* Internal, do not use. */
177 		return -ERANGE;  in _kstrtoul()
183 /* Internal, do not use. */
193 		return -ERANGE;  in _kstrtol()
200  * kstrtouint - convert a string to an unsigned int
201  * @s: The start of the string. The string must be null-terminated, and may also
204  * @base: The number base to use. The maximum supported base is 16. If base is
206  *  conventional semantics - If it begins with 0x the number will be parsed as a
207  *  hexadecimal (case insensitive), if it otherwise begins with 0, it will be
211  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
223 		return -ERANGE;  in kstrtouint()
230  * kstrtoint - convert a string to an int
231  * @s: The start of the string. The string must be null-terminated, and may also
234  * @base: The number base to use. The maximum supported base is 16. If base is
236  *  conventional semantics - If it begins with 0x the number will be parsed as a
237  *  hexadecimal (case insensitive), if it otherwise begins with 0, it will be
241  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
253 		return -ERANGE;  in kstrtoint()
268 		return -ERANGE;  in kstrtou16()
283 		return -ERANGE;  in kstrtos16()
298 		return -ERANGE;  in kstrtou8()
313 		return -ERANGE;  in kstrtos8()
320  * kstrtobool - convert common user inputs into boolean values
325  * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL.  Value
331 		return -EINVAL;  in kstrtobool()
334 	case 'y':  in kstrtobool()
335 	case 'Y':  in kstrtobool()
336 	case '1':  in kstrtobool()
339 	case 'n':  in kstrtobool()
340 	case 'N':  in kstrtobool()
341 	case '0':  in kstrtobool()
344 	case 'o':  in kstrtobool()
345 	case 'O':  in kstrtobool()
347 		case 'n':  in kstrtobool()
348 		case 'N':  in kstrtobool()
351 		case 'f':  in kstrtobool()
352 		case 'F':  in kstrtobool()
362 	return -EINVAL;  in kstrtobool()
367  * Since "base" would be a nonsense argument, this open-codes the
375 	count = min(count, sizeof(buf) - 1);  in kstrtobool_from_user()
377 		return -EFAULT;  in kstrtobool_from_user()
389 	count = min(count, sizeof(buf) - 1);				\
391 		return -EFAULT;						\