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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Convert integer string representation to an integer.
4 * If an integer doesn't fit into specified type, -E is returned.
5 *
6 * Integer starts with optional sign.
7 * kstrtou*() functions do not accept sign "-".
8 *
9 * Radix 0 means autodetection: leading "0x" implies radix 16,
10 * leading "0" implies radix 8, otherwise radix is 10.
11 * Autodetection hints work after optional sign, but not before.
12 *
13 * If -E is returned, result is not touched.
14 */
15#include <linux/ctype.h>
16#include <linux/errno.h>
17#include <linux/export.h>
18#include <linux/kstrtox.h>
19#include <linux/math64.h>
20#include <linux/types.h>
21#include <linux/uaccess.h>
22
23#include "kstrtox.h"
24
25noinline
26const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
27{
28 if (*base == 0) {
29 if (s[0] == '0') {
30 if (_tolower(s[1]) == 'x' && isxdigit(s[2]))
31 *base = 16;
32 else
33 *base = 8;
34 } else
35 *base = 10;
36 }
37 if (*base == 16 && s[0] == '0' && _tolower(s[1]) == 'x')
38 s += 2;
39 return s;
40}
41
42/*
43 * Convert non-negative integer string representation in explicitly given radix
44 * to an integer. A maximum of max_chars characters will be converted.
45 *
46 * Return number of characters consumed maybe or-ed with overflow bit.
47 * If overflow occurs, result integer (incorrect) is still returned.
48 *
49 * Don't you dare use this function.
50 */
51noinline
52unsigned int _parse_integer_limit(const char *s, unsigned int base, unsigned long long *p,
53 size_t max_chars)
54{
55 unsigned long long res;
56 unsigned int rv;
57
58 res = 0;
59 rv = 0;
60 while (max_chars--) {
61 unsigned int c = *s;
62 unsigned int lc = _tolower(c);
63 unsigned int val;
64
65 if ('0' <= c && c <= '9')
66 val = c - '0';
67 else if ('a' <= lc && lc <= 'f')
68 val = lc - 'a' + 10;
69 else
70 break;
71
72 if (val >= base)
73 break;
74 /*
75 * Check for overflow only if we are within range of
76 * it in the max base we support (16)
77 */
78 if (unlikely(res & (~0ull << 60))) {
79 if (res > div_u64(ULLONG_MAX - val, base))
80 rv |= KSTRTOX_OVERFLOW;
81 }
82 res = res * base + val;
83 rv++;
84 s++;
85 }
86 *p = res;
87 return rv;
88}
89
90noinline
91unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *p)
92{
93 return _parse_integer_limit(s, base, p, INT_MAX);
94}
95
96static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
97{
98 unsigned long long _res;
99 unsigned int rv;
100
101 s = _parse_integer_fixup_radix(s, &base);
102 rv = _parse_integer(s, base, &_res);
103 if (rv & KSTRTOX_OVERFLOW)
104 return -ERANGE;
105 if (rv == 0)
106 return -EINVAL;
107 s += rv;
108 if (*s == '\n')
109 s++;
110 if (*s)
111 return -EINVAL;
112 *res = _res;
113 return 0;
114}
115
116/**
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
119 * include a single newline before its terminating null. The first character
120 * may also be a plus sign, but not a minus sign.
121 * @base: The number base to use. The maximum supported base is 16. If base is
122 * given as 0, then the base of the string is automatically detected with the
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
125 * parsed as an octal number. Otherwise it will be parsed as a decimal.
126 * @res: Where to write the result of the conversion on success.
127 *
128 * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
129 * Preferred over simple_strtoull(). Return code must be checked.
130 */
131noinline
132int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
133{
134 if (s[0] == '+')
135 s++;
136 return _kstrtoull(s, base, res);
137}
138EXPORT_SYMBOL(kstrtoull);
139
140/**
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
143 * include a single newline before its terminating null. The first character
144 * may also be a plus sign or a minus sign.
145 * @base: The number base to use. The maximum supported base is 16. If base is
146 * given as 0, then the base of the string is automatically detected with the
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
149 * parsed as an octal number. Otherwise it will be parsed as a decimal.
150 * @res: Where to write the result of the conversion on success.
151 *
152 * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
153 * Preferred over simple_strtoll(). Return code must be checked.
154 */
155noinline
156int kstrtoll(const char *s, unsigned int base, long long *res)
157{
158 unsigned long long tmp;
159 int rv;
160
161 if (s[0] == '-') {
162 rv = _kstrtoull(s + 1, base, &tmp);
163 if (rv < 0)
164 return rv;
165 if ((long long)-tmp > 0)
166 return -ERANGE;
167 *res = -tmp;
168 } else {
169 rv = kstrtoull(s, base, &tmp);
170 if (rv < 0)
171 return rv;
172 if ((long long)tmp < 0)
173 return -ERANGE;
174 *res = tmp;
175 }
176 return 0;
177}
178EXPORT_SYMBOL(kstrtoll);
179
180/* Internal, do not use. */
181int _kstrtoul(const char *s, unsigned int base, unsigned long *res)
182{
183 unsigned long long tmp;
184 int rv;
185
186 rv = kstrtoull(s, base, &tmp);
187 if (rv < 0)
188 return rv;
189 if (tmp != (unsigned long)tmp)
190 return -ERANGE;
191 *res = tmp;
192 return 0;
193}
194EXPORT_SYMBOL(_kstrtoul);
195
196/* Internal, do not use. */
197int _kstrtol(const char *s, unsigned int base, long *res)
198{
199 long long tmp;
200 int rv;
201
202 rv = kstrtoll(s, base, &tmp);
203 if (rv < 0)
204 return rv;
205 if (tmp != (long)tmp)
206 return -ERANGE;
207 *res = tmp;
208 return 0;
209}
210EXPORT_SYMBOL(_kstrtol);
211
212/**
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
215 * include a single newline before its terminating null. The first character
216 * may also be a plus sign, but not a minus sign.
217 * @base: The number base to use. The maximum supported base is 16. If base is
218 * given as 0, then the base of the string is automatically detected with the
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
221 * parsed as an octal number. Otherwise it will be parsed as a decimal.
222 * @res: Where to write the result of the conversion on success.
223 *
224 * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
225 * Preferred over simple_strtoul(). Return code must be checked.
226 */
227noinline
228int kstrtouint(const char *s, unsigned int base, unsigned int *res)
229{
230 unsigned long long tmp;
231 int rv;
232
233 rv = kstrtoull(s, base, &tmp);
234 if (rv < 0)
235 return rv;
236 if (tmp != (unsigned int)tmp)
237 return -ERANGE;
238 *res = tmp;
239 return 0;
240}
241EXPORT_SYMBOL(kstrtouint);
242
243/**
244 * kstrtoint - convert a string to an int
245 * @s: The start of the string. The string must be null-terminated, and may also
246 * include a single newline before its terminating null. The first character
247 * may also be a plus sign or a minus sign.
248 * @base: The number base to use. The maximum supported base is 16. If base is
249 * given as 0, then the base of the string is automatically detected with the
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
252 * parsed as an octal number. Otherwise it will be parsed as a decimal.
253 * @res: Where to write the result of the conversion on success.
254 *
255 * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
256 * Preferred over simple_strtol(). Return code must be checked.
257 */
258noinline
259int kstrtoint(const char *s, unsigned int base, int *res)
260{
261 long long tmp;
262 int rv;
263
264 rv = kstrtoll(s, base, &tmp);
265 if (rv < 0)
266 return rv;
267 if (tmp != (int)tmp)
268 return -ERANGE;
269 *res = tmp;
270 return 0;
271}
272EXPORT_SYMBOL(kstrtoint);
273
274noinline
275int kstrtou16(const char *s, unsigned int base, u16 *res)
276{
277 unsigned long long tmp;
278 int rv;
279
280 rv = kstrtoull(s, base, &tmp);
281 if (rv < 0)
282 return rv;
283 if (tmp != (u16)tmp)
284 return -ERANGE;
285 *res = tmp;
286 return 0;
287}
288EXPORT_SYMBOL(kstrtou16);
289
290noinline
291int kstrtos16(const char *s, unsigned int base, s16 *res)
292{
293 long long tmp;
294 int rv;
295
296 rv = kstrtoll(s, base, &tmp);
297 if (rv < 0)
298 return rv;
299 if (tmp != (s16)tmp)
300 return -ERANGE;
301 *res = tmp;
302 return 0;
303}
304EXPORT_SYMBOL(kstrtos16);
305
306noinline
307int kstrtou8(const char *s, unsigned int base, u8 *res)
308{
309 unsigned long long tmp;
310 int rv;
311
312 rv = kstrtoull(s, base, &tmp);
313 if (rv < 0)
314 return rv;
315 if (tmp != (u8)tmp)
316 return -ERANGE;
317 *res = tmp;
318 return 0;
319}
320EXPORT_SYMBOL(kstrtou8);
321
322noinline
323int kstrtos8(const char *s, unsigned int base, s8 *res)
324{
325 long long tmp;
326 int rv;
327
328 rv = kstrtoll(s, base, &tmp);
329 if (rv < 0)
330 return rv;
331 if (tmp != (s8)tmp)
332 return -ERANGE;
333 *res = tmp;
334 return 0;
335}
336EXPORT_SYMBOL(kstrtos8);
337
338/**
339 * kstrtobool - convert common user inputs into boolean values
340 * @s: input string
341 * @res: result
342 *
343 * This routine returns 0 iff the first character is one of 'YyTt1NnFf0', or
344 * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL. Value
345 * pointed to by res is updated upon finding a match.
346 */
347noinline
348int kstrtobool(const char *s, bool *res)
349{
350 if (!s)
351 return -EINVAL;
352
353 switch (s[0]) {
354 case 'y':
355 case 'Y':
356 case 't':
357 case 'T':
358 case '1':
359 *res = true;
360 return 0;
361 case 'n':
362 case 'N':
363 case 'f':
364 case 'F':
365 case '0':
366 *res = false;
367 return 0;
368 case 'o':
369 case 'O':
370 switch (s[1]) {
371 case 'n':
372 case 'N':
373 *res = true;
374 return 0;
375 case 'f':
376 case 'F':
377 *res = false;
378 return 0;
379 default:
380 break;
381 }
382 break;
383 default:
384 break;
385 }
386
387 return -EINVAL;
388}
389EXPORT_SYMBOL(kstrtobool);
390
391/*
392 * Since "base" would be a nonsense argument, this open-codes the
393 * _from_user helper instead of using the helper macro below.
394 */
395int kstrtobool_from_user(const char __user *s, size_t count, bool *res)
396{
397 /* Longest string needed to differentiate, newline, terminator */
398 char buf[4];
399
400 count = min(count, sizeof(buf) - 1);
401 if (copy_from_user(buf, s, count))
402 return -EFAULT;
403 buf[count] = '\0';
404 return kstrtobool(buf, res);
405}
406EXPORT_SYMBOL(kstrtobool_from_user);
407
408#define kstrto_from_user(f, g, type) \
409int f(const char __user *s, size_t count, unsigned int base, type *res) \
410{ \
411 /* sign, base 2 representation, newline, terminator */ \
412 char buf[1 + sizeof(type) * 8 + 1 + 1]; \
413 \
414 count = min(count, sizeof(buf) - 1); \
415 if (copy_from_user(buf, s, count)) \
416 return -EFAULT; \
417 buf[count] = '\0'; \
418 return g(buf, base, res); \
419} \
420EXPORT_SYMBOL(f)
421
422kstrto_from_user(kstrtoull_from_user, kstrtoull, unsigned long long);
423kstrto_from_user(kstrtoll_from_user, kstrtoll, long long);
424kstrto_from_user(kstrtoul_from_user, kstrtoul, unsigned long);
425kstrto_from_user(kstrtol_from_user, kstrtol, long);
426kstrto_from_user(kstrtouint_from_user, kstrtouint, unsigned int);
427kstrto_from_user(kstrtoint_from_user, kstrtoint, int);
428kstrto_from_user(kstrtou16_from_user, kstrtou16, u16);
429kstrto_from_user(kstrtos16_from_user, kstrtos16, s16);
430kstrto_from_user(kstrtou8_from_user, kstrtou8, u8);
431kstrto_from_user(kstrtos8_from_user, kstrtos8, s8);
1/*
2 * Convert integer string representation to an integer.
3 * If an integer doesn't fit into specified type, -E is returned.
4 *
5 * Integer starts with optional sign.
6 * kstrtou*() functions do not accept sign "-".
7 *
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.
11 *
12 * If -E is returned, result is not touched.
13 */
14#include <linux/ctype.h>
15#include <linux/errno.h>
16#include <linux/kernel.h>
17#include <linux/math64.h>
18#include <linux/export.h>
19#include <linux/types.h>
20#include <linux/uaccess.h>
21#include "kstrtox.h"
22
23const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
24{
25 if (*base == 0) {
26 if (s[0] == '0') {
27 if (_tolower(s[1]) == 'x' && isxdigit(s[2]))
28 *base = 16;
29 else
30 *base = 8;
31 } else
32 *base = 10;
33 }
34 if (*base == 16 && s[0] == '0' && _tolower(s[1]) == 'x')
35 s += 2;
36 return s;
37}
38
39/*
40 * Convert non-negative integer string representation in explicitly given radix
41 * to an integer.
42 * Return number of characters consumed maybe or-ed with overflow bit.
43 * If overflow occurs, result integer (incorrect) is still returned.
44 *
45 * Don't you dare use this function.
46 */
47unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *p)
48{
49 unsigned long long res;
50 unsigned int rv;
51
52 res = 0;
53 rv = 0;
54 while (*s) {
55 unsigned int val;
56
57 if ('0' <= *s && *s <= '9')
58 val = *s - '0';
59 else if ('a' <= _tolower(*s) && _tolower(*s) <= 'f')
60 val = _tolower(*s) - 'a' + 10;
61 else
62 break;
63
64 if (val >= base)
65 break;
66 /*
67 * Check for overflow only if we are within range of
68 * it in the max base we support (16)
69 */
70 if (unlikely(res & (~0ull << 60))) {
71 if (res > div_u64(ULLONG_MAX - val, base))
72 rv |= KSTRTOX_OVERFLOW;
73 }
74 res = res * base + val;
75 rv++;
76 s++;
77 }
78 *p = res;
79 return rv;
80}
81
82static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
83{
84 unsigned long long _res;
85 unsigned int rv;
86
87 s = _parse_integer_fixup_radix(s, &base);
88 rv = _parse_integer(s, base, &_res);
89 if (rv & KSTRTOX_OVERFLOW)
90 return -ERANGE;
91 if (rv == 0)
92 return -EINVAL;
93 s += rv;
94 if (*s == '\n')
95 s++;
96 if (*s)
97 return -EINVAL;
98 *res = _res;
99 return 0;
100}
101
102/**
103 * kstrtoull - convert a string to an unsigned long long
104 * @s: The start of the string. The string must be null-terminated, and may also
105 * include a single newline before its terminating null. The first character
106 * may also be a plus sign, but not a minus sign.
107 * @base: The number base to use. The maximum supported base is 16. If base is
108 * given as 0, then the base of the string is automatically detected with the
109 * conventional semantics - If it begins with 0x the number will be parsed as a
110 * hexadecimal (case insensitive), if it otherwise begins with 0, it will be
111 * parsed as an octal number. Otherwise it will be parsed as a decimal.
112 * @res: Where to write the result of the conversion on success.
113 *
114 * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
115 * Used as a replacement for the obsolete simple_strtoull. Return code must
116 * be checked.
117 */
118int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
119{
120 if (s[0] == '+')
121 s++;
122 return _kstrtoull(s, base, res);
123}
124EXPORT_SYMBOL(kstrtoull);
125
126/**
127 * kstrtoll - convert a string to a long long
128 * @s: The start of the string. The string must be null-terminated, and may also
129 * include a single newline before its terminating null. The first character
130 * may also be a plus sign or a minus sign.
131 * @base: The number base to use. The maximum supported base is 16. If base is
132 * given as 0, then the base of the string is automatically detected with the
133 * conventional semantics - If it begins with 0x the number will be parsed as a
134 * hexadecimal (case insensitive), if it otherwise begins with 0, it will be
135 * parsed as an octal number. Otherwise it will be parsed as a decimal.
136 * @res: Where to write the result of the conversion on success.
137 *
138 * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
139 * Used as a replacement for the obsolete simple_strtoull. Return code must
140 * be checked.
141 */
142int kstrtoll(const char *s, unsigned int base, long long *res)
143{
144 unsigned long long tmp;
145 int rv;
146
147 if (s[0] == '-') {
148 rv = _kstrtoull(s + 1, base, &tmp);
149 if (rv < 0)
150 return rv;
151 if ((long long)-tmp > 0)
152 return -ERANGE;
153 *res = -tmp;
154 } else {
155 rv = kstrtoull(s, base, &tmp);
156 if (rv < 0)
157 return rv;
158 if ((long long)tmp < 0)
159 return -ERANGE;
160 *res = tmp;
161 }
162 return 0;
163}
164EXPORT_SYMBOL(kstrtoll);
165
166/* Internal, do not use. */
167int _kstrtoul(const char *s, unsigned int base, unsigned long *res)
168{
169 unsigned long long tmp;
170 int rv;
171
172 rv = kstrtoull(s, base, &tmp);
173 if (rv < 0)
174 return rv;
175 if (tmp != (unsigned long long)(unsigned long)tmp)
176 return -ERANGE;
177 *res = tmp;
178 return 0;
179}
180EXPORT_SYMBOL(_kstrtoul);
181
182/* Internal, do not use. */
183int _kstrtol(const char *s, unsigned int base, long *res)
184{
185 long long tmp;
186 int rv;
187
188 rv = kstrtoll(s, base, &tmp);
189 if (rv < 0)
190 return rv;
191 if (tmp != (long long)(long)tmp)
192 return -ERANGE;
193 *res = tmp;
194 return 0;
195}
196EXPORT_SYMBOL(_kstrtol);
197
198/**
199 * kstrtouint - convert a string to an unsigned int
200 * @s: The start of the string. The string must be null-terminated, and may also
201 * include a single newline before its terminating null. The first character
202 * may also be a plus sign, but not a minus sign.
203 * @base: The number base to use. The maximum supported base is 16. If base is
204 * given as 0, then the base of the string is automatically detected with the
205 * conventional semantics - If it begins with 0x the number will be parsed as a
206 * hexadecimal (case insensitive), if it otherwise begins with 0, it will be
207 * parsed as an octal number. Otherwise it will be parsed as a decimal.
208 * @res: Where to write the result of the conversion on success.
209 *
210 * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
211 * Used as a replacement for the obsolete simple_strtoull. Return code must
212 * be checked.
213 */
214int kstrtouint(const char *s, unsigned int base, unsigned int *res)
215{
216 unsigned long long tmp;
217 int rv;
218
219 rv = kstrtoull(s, base, &tmp);
220 if (rv < 0)
221 return rv;
222 if (tmp != (unsigned long long)(unsigned int)tmp)
223 return -ERANGE;
224 *res = tmp;
225 return 0;
226}
227EXPORT_SYMBOL(kstrtouint);
228
229/**
230 * kstrtoint - convert a string to an int
231 * @s: The start of the string. The string must be null-terminated, and may also
232 * include a single newline before its terminating null. The first character
233 * may also be a plus sign or a minus sign.
234 * @base: The number base to use. The maximum supported base is 16. If base is
235 * given as 0, then the base of the string is automatically detected with the
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
238 * parsed as an octal number. Otherwise it will be parsed as a decimal.
239 * @res: Where to write the result of the conversion on success.
240 *
241 * Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
242 * Used as a replacement for the obsolete simple_strtoull. Return code must
243 * be checked.
244 */
245int kstrtoint(const char *s, unsigned int base, int *res)
246{
247 long long tmp;
248 int rv;
249
250 rv = kstrtoll(s, base, &tmp);
251 if (rv < 0)
252 return rv;
253 if (tmp != (long long)(int)tmp)
254 return -ERANGE;
255 *res = tmp;
256 return 0;
257}
258EXPORT_SYMBOL(kstrtoint);
259
260int kstrtou16(const char *s, unsigned int base, u16 *res)
261{
262 unsigned long long tmp;
263 int rv;
264
265 rv = kstrtoull(s, base, &tmp);
266 if (rv < 0)
267 return rv;
268 if (tmp != (unsigned long long)(u16)tmp)
269 return -ERANGE;
270 *res = tmp;
271 return 0;
272}
273EXPORT_SYMBOL(kstrtou16);
274
275int kstrtos16(const char *s, unsigned int base, s16 *res)
276{
277 long long tmp;
278 int rv;
279
280 rv = kstrtoll(s, base, &tmp);
281 if (rv < 0)
282 return rv;
283 if (tmp != (long long)(s16)tmp)
284 return -ERANGE;
285 *res = tmp;
286 return 0;
287}
288EXPORT_SYMBOL(kstrtos16);
289
290int kstrtou8(const char *s, unsigned int base, u8 *res)
291{
292 unsigned long long tmp;
293 int rv;
294
295 rv = kstrtoull(s, base, &tmp);
296 if (rv < 0)
297 return rv;
298 if (tmp != (unsigned long long)(u8)tmp)
299 return -ERANGE;
300 *res = tmp;
301 return 0;
302}
303EXPORT_SYMBOL(kstrtou8);
304
305int kstrtos8(const char *s, unsigned int base, s8 *res)
306{
307 long long tmp;
308 int rv;
309
310 rv = kstrtoll(s, base, &tmp);
311 if (rv < 0)
312 return rv;
313 if (tmp != (long long)(s8)tmp)
314 return -ERANGE;
315 *res = tmp;
316 return 0;
317}
318EXPORT_SYMBOL(kstrtos8);
319
320/**
321 * kstrtobool - convert common user inputs into boolean values
322 * @s: input string
323 * @res: result
324 *
325 * This routine returns 0 iff the first character is one of 'Yy1Nn0', or
326 * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL. Value
327 * pointed to by res is updated upon finding a match.
328 */
329int kstrtobool(const char *s, bool *res)
330{
331 if (!s)
332 return -EINVAL;
333
334 switch (s[0]) {
335 case 'y':
336 case 'Y':
337 case '1':
338 *res = true;
339 return 0;
340 case 'n':
341 case 'N':
342 case '0':
343 *res = false;
344 return 0;
345 case 'o':
346 case 'O':
347 switch (s[1]) {
348 case 'n':
349 case 'N':
350 *res = true;
351 return 0;
352 case 'f':
353 case 'F':
354 *res = false;
355 return 0;
356 default:
357 break;
358 }
359 default:
360 break;
361 }
362
363 return -EINVAL;
364}
365EXPORT_SYMBOL(kstrtobool);
366
367/*
368 * Since "base" would be a nonsense argument, this open-codes the
369 * _from_user helper instead of using the helper macro below.
370 */
371int kstrtobool_from_user(const char __user *s, size_t count, bool *res)
372{
373 /* Longest string needed to differentiate, newline, terminator */
374 char buf[4];
375
376 count = min(count, sizeof(buf) - 1);
377 if (copy_from_user(buf, s, count))
378 return -EFAULT;
379 buf[count] = '\0';
380 return kstrtobool(buf, res);
381}
382EXPORT_SYMBOL(kstrtobool_from_user);
383
384#define kstrto_from_user(f, g, type) \
385int f(const char __user *s, size_t count, unsigned int base, type *res) \
386{ \
387 /* sign, base 2 representation, newline, terminator */ \
388 char buf[1 + sizeof(type) * 8 + 1 + 1]; \
389 \
390 count = min(count, sizeof(buf) - 1); \
391 if (copy_from_user(buf, s, count)) \
392 return -EFAULT; \
393 buf[count] = '\0'; \
394 return g(buf, base, res); \
395} \
396EXPORT_SYMBOL(f)
397
398kstrto_from_user(kstrtoull_from_user, kstrtoull, unsigned long long);
399kstrto_from_user(kstrtoll_from_user, kstrtoll, long long);
400kstrto_from_user(kstrtoul_from_user, kstrtoul, unsigned long);
401kstrto_from_user(kstrtol_from_user, kstrtol, long);
402kstrto_from_user(kstrtouint_from_user, kstrtouint, unsigned int);
403kstrto_from_user(kstrtoint_from_user, kstrtoint, int);
404kstrto_from_user(kstrtou16_from_user, kstrtou16, u16);
405kstrto_from_user(kstrtos16_from_user, kstrtos16, s16);
406kstrto_from_user(kstrtou8_from_user, kstrtou8, u8);
407kstrto_from_user(kstrtos8_from_user, kstrtos8, s8);