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.
42  * Convert non-negative integer string representation in explicitly given radix
45  * Return number of characters consumed maybe or-ed with overflow bit.
48  * Don't you dare use this function.
58 	while (max_chars--) {  in _parse_integer_limit()
64 			val = c - '0';  in _parse_integer_limit()
66 			val = lc - 'a' + 10;  in _parse_integer_limit()
77 			if (res > div_u64(ULLONG_MAX - val, base))  in _parse_integer_limit()
101 		return -ERANGE;  in _kstrtoull()
103 		return -EINVAL;  in _kstrtoull()
108 		return -EINVAL;  in _kstrtoull()
114  * kstrtoull - convert a string to an unsigned long long
115  * @s: The start of the string. The string must be null-terminated, and may also
118  * @base: The number base to use. The maximum supported base is 16. If base is
120  *  conventional semantics - If it begins with 0x the number will be parsed as a
121  *  hexadecimal (case insensitive), if it otherwise begins with 0, it will be
125  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
137  * kstrtoll - convert a string to a long long
138  * @s: The start of the string. The string must be null-terminated, and may also
141  * @base: The number base to use. The maximum supported base is 16. If base is
143  *  conventional semantics - If it begins with 0x the number will be parsed as a
144  *  hexadecimal (case insensitive), if it otherwise begins with 0, it will be
148  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
156 	if (s[0] == '-') {  in kstrtoll()
160 		if ((long long)-tmp > 0)  in kstrtoll()
161 			return -ERANGE;  in kstrtoll()
162 		*res = -tmp;  in kstrtoll()
168 			return -ERANGE;  in kstrtoll()
175 /* Internal, do not use. */
185 		return -ERANGE;  in _kstrtoul()
191 /* Internal, do not use. */
201 		return -ERANGE;  in _kstrtol()
208  * kstrtouint - convert a string to an unsigned int
209  * @s: The start of the string. The string must be null-terminated, and may also
212  * @base: The number base to use. The maximum supported base is 16. If base is
214  *  conventional semantics - If it begins with 0x the number will be parsed as a
215  *  hexadecimal (case insensitive), if it otherwise begins with 0, it will be
219  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
231 		return -ERANGE;  in kstrtouint()
238  * kstrtoint - convert a string to an int
239  * @s: The start of the string. The string must be null-terminated, and may also
242  * @base: The number base to use. The maximum supported base is 16. If base is
244  *  conventional semantics - If it begins with 0x the number will be parsed as a
245  *  hexadecimal (case insensitive), if it otherwise begins with 0, it will be
249  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
261 		return -ERANGE;  in kstrtoint()
276 		return -ERANGE;  in kstrtou16()
291 		return -ERANGE;  in kstrtos16()
306 		return -ERANGE;  in kstrtou8()
321 		return -ERANGE;  in kstrtos8()
328  * kstrtobool - convert common user inputs into boolean values
333  * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL.  Value
339 		return -EINVAL;  in kstrtobool()
342 	case 'y':  in kstrtobool()
343 	case 'Y':  in kstrtobool()
344 	case '1':  in kstrtobool()
347 	case 'n':  in kstrtobool()
348 	case 'N':  in kstrtobool()
349 	case '0':  in kstrtobool()
352 	case 'o':  in kstrtobool()
353 	case 'O':  in kstrtobool()
355 		case 'n':  in kstrtobool()
356 		case 'N':  in kstrtobool()
359 		case 'f':  in kstrtobool()
360 		case 'F':  in kstrtobool()
371 	return -EINVAL;  in kstrtobool()
376  * Since "base" would be a nonsense argument, this open-codes the
384 	count = min(count, sizeof(buf) - 1);  in kstrtobool_from_user()
386 		return -EFAULT;  in kstrtobool_from_user()
398 	count = min(count, sizeof(buf) - 1);				\
400 		return -EFAULT;						\