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.
43  * Convert non-negative integer string representation in explicitly given radix
46  * Return number of characters consumed maybe or-ed with overflow bit.
49  * Don't you dare use this function.
60 	while (max_chars--) {  in _parse_integer_limit()
66 			val = c - '0';  in _parse_integer_limit()
68 			val = lc - 'a' + 10;  in _parse_integer_limit()
79 			if (res > div_u64(ULLONG_MAX - val, base))  in _parse_integer_limit()
104 		return -ERANGE;  in _kstrtoull()
106 		return -EINVAL;  in _kstrtoull()
111 		return -EINVAL;  in _kstrtoull()
117  * kstrtoull - convert a string to an unsigned long long
118  * @s: The start of the string. The string must be null-terminated, and may also
121  * @base: The number base to use. The maximum supported base is 16. If base is
123  *  conventional semantics - If it begins with 0x the number will be parsed as a
124  *  hexadecimal (case insensitive), if it otherwise begins with 0, it will be
128  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
141  * kstrtoll - convert a string to a long long
142  * @s: The start of the string. The string must be null-terminated, and may also
145  * @base: The number base to use. The maximum supported base is 16. If base is
147  *  conventional semantics - If it begins with 0x the number will be parsed as a
148  *  hexadecimal (case insensitive), if it otherwise begins with 0, it will be
152  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
161 	if (s[0] == '-') {  in kstrtoll()
165 		if ((long long)-tmp > 0)  in kstrtoll()
166 			return -ERANGE;  in kstrtoll()
167 		*res = -tmp;  in kstrtoll()
173 			return -ERANGE;  in kstrtoll()
180 /* Internal, do not use. */
190 		return -ERANGE;  in _kstrtoul()
196 /* Internal, do not use. */
206 		return -ERANGE;  in _kstrtol()
213  * kstrtouint - convert a string to an unsigned int
214  * @s: The start of the string. The string must be null-terminated, and may also
217  * @base: The number base to use. The maximum supported base is 16. If base is
219  *  conventional semantics - If it begins with 0x the number will be parsed as a
220  *  hexadecimal (case insensitive), if it otherwise begins with 0, it will be
224  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
237 		return -ERANGE;  in kstrtouint()
244  * kstrtoint - convert a string to an int
245  * @s: The start of the string. The string must be null-terminated, and may also
248  * @base: The number base to use. The maximum supported base is 16. If base is
250  *  conventional semantics - If it begins with 0x the number will be parsed as a
251  *  hexadecimal (case insensitive), if it otherwise begins with 0, it will be
255  * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
268 		return -ERANGE;  in kstrtoint()
284 		return -ERANGE;  in kstrtou16()
300 		return -ERANGE;  in kstrtos16()
316 		return -ERANGE;  in kstrtou8()
332 		return -ERANGE;  in kstrtos8()
339  * kstrtobool - convert common user inputs into boolean values
344  * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL.  Value
351 		return -EINVAL;  in kstrtobool()
354 	case 'y':  in kstrtobool()
355 	case 'Y':  in kstrtobool()
356 	case 't':  in kstrtobool()
357 	case 'T':  in kstrtobool()
358 	case '1':  in kstrtobool()
361 	case 'n':  in kstrtobool()
362 	case 'N':  in kstrtobool()
363 	case 'f':  in kstrtobool()
364 	case 'F':  in kstrtobool()
365 	case '0':  in kstrtobool()
368 	case 'o':  in kstrtobool()
369 	case 'O':  in kstrtobool()
371 		case 'n':  in kstrtobool()
372 		case 'N':  in kstrtobool()
375 		case 'f':  in kstrtobool()
376 		case 'F':  in kstrtobool()
387 	return -EINVAL;  in kstrtobool()
392  * Since "base" would be a nonsense argument, this open-codes the
400 	count = min(count, sizeof(buf) - 1);  in kstrtobool_from_user()
402 		return -EFAULT;  in kstrtobool_from_user()
414 	count = min(count, sizeof(buf) - 1);				\
416 		return -EFAULT;						\