Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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/module.h>
19#include <linux/types.h>
20#include <asm/uaccess.h>
21
22static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
23{
24 unsigned long long acc;
25 int ok;
26
27 if (base == 0) {
28 if (s[0] == '0') {
29 if (_tolower(s[1]) == 'x' && isxdigit(s[2]))
30 base = 16;
31 else
32 base = 8;
33 } else
34 base = 10;
35 }
36 if (base == 16 && s[0] == '0' && _tolower(s[1]) == 'x')
37 s += 2;
38
39 acc = 0;
40 ok = 0;
41 while (*s) {
42 unsigned int val;
43
44 if ('0' <= *s && *s <= '9')
45 val = *s - '0';
46 else if ('a' <= _tolower(*s) && _tolower(*s) <= 'f')
47 val = _tolower(*s) - 'a' + 10;
48 else if (*s == '\n' && *(s + 1) == '\0')
49 break;
50 else
51 return -EINVAL;
52
53 if (val >= base)
54 return -EINVAL;
55 if (acc > div_u64(ULLONG_MAX - val, base))
56 return -ERANGE;
57 acc = acc * base + val;
58 ok = 1;
59
60 s++;
61 }
62 if (!ok)
63 return -EINVAL;
64 *res = acc;
65 return 0;
66}
67
68int kstrtoull(const char *s, unsigned int base, unsigned long long *res)
69{
70 if (s[0] == '+')
71 s++;
72 return _kstrtoull(s, base, res);
73}
74EXPORT_SYMBOL(kstrtoull);
75
76int kstrtoll(const char *s, unsigned int base, long long *res)
77{
78 unsigned long long tmp;
79 int rv;
80
81 if (s[0] == '-') {
82 rv = _kstrtoull(s + 1, base, &tmp);
83 if (rv < 0)
84 return rv;
85 if ((long long)(-tmp) >= 0)
86 return -ERANGE;
87 *res = -tmp;
88 } else {
89 rv = kstrtoull(s, base, &tmp);
90 if (rv < 0)
91 return rv;
92 if ((long long)tmp < 0)
93 return -ERANGE;
94 *res = tmp;
95 }
96 return 0;
97}
98EXPORT_SYMBOL(kstrtoll);
99
100/* Internal, do not use. */
101int _kstrtoul(const char *s, unsigned int base, unsigned long *res)
102{
103 unsigned long long tmp;
104 int rv;
105
106 rv = kstrtoull(s, base, &tmp);
107 if (rv < 0)
108 return rv;
109 if (tmp != (unsigned long long)(unsigned long)tmp)
110 return -ERANGE;
111 *res = tmp;
112 return 0;
113}
114EXPORT_SYMBOL(_kstrtoul);
115
116/* Internal, do not use. */
117int _kstrtol(const char *s, unsigned int base, long *res)
118{
119 long long tmp;
120 int rv;
121
122 rv = kstrtoll(s, base, &tmp);
123 if (rv < 0)
124 return rv;
125 if (tmp != (long long)(long)tmp)
126 return -ERANGE;
127 *res = tmp;
128 return 0;
129}
130EXPORT_SYMBOL(_kstrtol);
131
132int kstrtouint(const char *s, unsigned int base, unsigned int *res)
133{
134 unsigned long long tmp;
135 int rv;
136
137 rv = kstrtoull(s, base, &tmp);
138 if (rv < 0)
139 return rv;
140 if (tmp != (unsigned long long)(unsigned int)tmp)
141 return -ERANGE;
142 *res = tmp;
143 return 0;
144}
145EXPORT_SYMBOL(kstrtouint);
146
147int kstrtoint(const char *s, unsigned int base, int *res)
148{
149 long long tmp;
150 int rv;
151
152 rv = kstrtoll(s, base, &tmp);
153 if (rv < 0)
154 return rv;
155 if (tmp != (long long)(int)tmp)
156 return -ERANGE;
157 *res = tmp;
158 return 0;
159}
160EXPORT_SYMBOL(kstrtoint);
161
162int kstrtou16(const char *s, unsigned int base, u16 *res)
163{
164 unsigned long long tmp;
165 int rv;
166
167 rv = kstrtoull(s, base, &tmp);
168 if (rv < 0)
169 return rv;
170 if (tmp != (unsigned long long)(u16)tmp)
171 return -ERANGE;
172 *res = tmp;
173 return 0;
174}
175EXPORT_SYMBOL(kstrtou16);
176
177int kstrtos16(const char *s, unsigned int base, s16 *res)
178{
179 long long tmp;
180 int rv;
181
182 rv = kstrtoll(s, base, &tmp);
183 if (rv < 0)
184 return rv;
185 if (tmp != (long long)(s16)tmp)
186 return -ERANGE;
187 *res = tmp;
188 return 0;
189}
190EXPORT_SYMBOL(kstrtos16);
191
192int kstrtou8(const char *s, unsigned int base, u8 *res)
193{
194 unsigned long long tmp;
195 int rv;
196
197 rv = kstrtoull(s, base, &tmp);
198 if (rv < 0)
199 return rv;
200 if (tmp != (unsigned long long)(u8)tmp)
201 return -ERANGE;
202 *res = tmp;
203 return 0;
204}
205EXPORT_SYMBOL(kstrtou8);
206
207int kstrtos8(const char *s, unsigned int base, s8 *res)
208{
209 long long tmp;
210 int rv;
211
212 rv = kstrtoll(s, base, &tmp);
213 if (rv < 0)
214 return rv;
215 if (tmp != (long long)(s8)tmp)
216 return -ERANGE;
217 *res = tmp;
218 return 0;
219}
220EXPORT_SYMBOL(kstrtos8);
221
222#define kstrto_from_user(f, g, type) \
223int f(const char __user *s, size_t count, unsigned int base, type *res) \
224{ \
225 /* sign, base 2 representation, newline, terminator */ \
226 char buf[1 + sizeof(type) * 8 + 1 + 1]; \
227 \
228 count = min(count, sizeof(buf) - 1); \
229 if (copy_from_user(buf, s, count)) \
230 return -EFAULT; \
231 buf[count] = '\0'; \
232 return g(buf, base, res); \
233} \
234EXPORT_SYMBOL(f)
235
236kstrto_from_user(kstrtoull_from_user, kstrtoull, unsigned long long);
237kstrto_from_user(kstrtoll_from_user, kstrtoll, long long);
238kstrto_from_user(kstrtoul_from_user, kstrtoul, unsigned long);
239kstrto_from_user(kstrtol_from_user, kstrtol, long);
240kstrto_from_user(kstrtouint_from_user, kstrtouint, unsigned int);
241kstrto_from_user(kstrtoint_from_user, kstrtoint, int);
242kstrto_from_user(kstrtou16_from_user, kstrtou16, u16);
243kstrto_from_user(kstrtos16_from_user, kstrtos16, s16);
244kstrto_from_user(kstrtou8_from_user, kstrtou8, u8);
245kstrto_from_user(kstrtos8_from_user, kstrtos8, s8);