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Source at commit b386be689295730688885552666ea40b2e639b14 created 8 years 11 months ago. By Maarten ter Huurne, Revert "MIPS: JZ4740: reset: Initialize hibernate wakeup counters." | |
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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 | #include "kstrtox.h" |
22 | |
23 | const 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 | */ |
47 | unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *p) |
48 | { |
49 | unsigned long long res; |
50 | unsigned int rv; |
51 | int overflow; |
52 | |
53 | res = 0; |
54 | rv = 0; |
55 | overflow = 0; |
56 | while (*s) { |
57 | unsigned int val; |
58 | |
59 | if ('0' <= *s && *s <= '9') |
60 | val = *s - '0'; |
61 | else if ('a' <= _tolower(*s) && _tolower(*s) <= 'f') |
62 | val = _tolower(*s) - 'a' + 10; |
63 | else |
64 | break; |
65 | |
66 | if (val >= base) |
67 | break; |
68 | /* |
69 | * Check for overflow only if we are within range of |
70 | * it in the max base we support (16) |
71 | */ |
72 | if (unlikely(res & (~0ull << 60))) { |
73 | if (res > div_u64(ULLONG_MAX - val, base)) |
74 | overflow = 1; |
75 | } |
76 | res = res * base + val; |
77 | rv++; |
78 | s++; |
79 | } |
80 | *p = res; |
81 | if (overflow) |
82 | rv |= KSTRTOX_OVERFLOW; |
83 | return rv; |
84 | } |
85 | |
86 | static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res) |
87 | { |
88 | unsigned long long _res; |
89 | unsigned int rv; |
90 | |
91 | s = _parse_integer_fixup_radix(s, &base); |
92 | rv = _parse_integer(s, base, &_res); |
93 | if (rv & KSTRTOX_OVERFLOW) |
94 | return -ERANGE; |
95 | rv &= ~KSTRTOX_OVERFLOW; |
96 | if (rv == 0) |
97 | return -EINVAL; |
98 | s += rv; |
99 | if (*s == '\n') |
100 | s++; |
101 | if (*s) |
102 | return -EINVAL; |
103 | *res = _res; |
104 | return 0; |
105 | } |
106 | |
107 | int kstrtoull(const char *s, unsigned int base, unsigned long long *res) |
108 | { |
109 | if (s[0] == '+') |
110 | s++; |
111 | return _kstrtoull(s, base, res); |
112 | } |
113 | EXPORT_SYMBOL(kstrtoull); |
114 | |
115 | int kstrtoll(const char *s, unsigned int base, long long *res) |
116 | { |
117 | unsigned long long tmp; |
118 | int rv; |
119 | |
120 | if (s[0] == '-') { |
121 | rv = _kstrtoull(s + 1, base, &tmp); |
122 | if (rv < 0) |
123 | return rv; |
124 | if ((long long)(-tmp) >= 0) |
125 | return -ERANGE; |
126 | *res = -tmp; |
127 | } else { |
128 | rv = kstrtoull(s, base, &tmp); |
129 | if (rv < 0) |
130 | return rv; |
131 | if ((long long)tmp < 0) |
132 | return -ERANGE; |
133 | *res = tmp; |
134 | } |
135 | return 0; |
136 | } |
137 | EXPORT_SYMBOL(kstrtoll); |
138 | |
139 | /* Internal, do not use. */ |
140 | int _kstrtoul(const char *s, unsigned int base, unsigned long *res) |
141 | { |
142 | unsigned long long tmp; |
143 | int rv; |
144 | |
145 | rv = kstrtoull(s, base, &tmp); |
146 | if (rv < 0) |
147 | return rv; |
148 | if (tmp != (unsigned long long)(unsigned long)tmp) |
149 | return -ERANGE; |
150 | *res = tmp; |
151 | return 0; |
152 | } |
153 | EXPORT_SYMBOL(_kstrtoul); |
154 | |
155 | /* Internal, do not use. */ |
156 | int _kstrtol(const char *s, unsigned int base, long *res) |
157 | { |
158 | long long tmp; |
159 | int rv; |
160 | |
161 | rv = kstrtoll(s, base, &tmp); |
162 | if (rv < 0) |
163 | return rv; |
164 | if (tmp != (long long)(long)tmp) |
165 | return -ERANGE; |
166 | *res = tmp; |
167 | return 0; |
168 | } |
169 | EXPORT_SYMBOL(_kstrtol); |
170 | |
171 | int kstrtouint(const char *s, unsigned int base, unsigned int *res) |
172 | { |
173 | unsigned long long tmp; |
174 | int rv; |
175 | |
176 | rv = kstrtoull(s, base, &tmp); |
177 | if (rv < 0) |
178 | return rv; |
179 | if (tmp != (unsigned long long)(unsigned int)tmp) |
180 | return -ERANGE; |
181 | *res = tmp; |
182 | return 0; |
183 | } |
184 | EXPORT_SYMBOL(kstrtouint); |
185 | |
186 | int kstrtoint(const char *s, unsigned int base, int *res) |
187 | { |
188 | long long tmp; |
189 | int rv; |
190 | |
191 | rv = kstrtoll(s, base, &tmp); |
192 | if (rv < 0) |
193 | return rv; |
194 | if (tmp != (long long)(int)tmp) |
195 | return -ERANGE; |
196 | *res = tmp; |
197 | return 0; |
198 | } |
199 | EXPORT_SYMBOL(kstrtoint); |
200 | |
201 | int kstrtou16(const char *s, unsigned int base, u16 *res) |
202 | { |
203 | unsigned long long tmp; |
204 | int rv; |
205 | |
206 | rv = kstrtoull(s, base, &tmp); |
207 | if (rv < 0) |
208 | return rv; |
209 | if (tmp != (unsigned long long)(u16)tmp) |
210 | return -ERANGE; |
211 | *res = tmp; |
212 | return 0; |
213 | } |
214 | EXPORT_SYMBOL(kstrtou16); |
215 | |
216 | int kstrtos16(const char *s, unsigned int base, s16 *res) |
217 | { |
218 | long long tmp; |
219 | int rv; |
220 | |
221 | rv = kstrtoll(s, base, &tmp); |
222 | if (rv < 0) |
223 | return rv; |
224 | if (tmp != (long long)(s16)tmp) |
225 | return -ERANGE; |
226 | *res = tmp; |
227 | return 0; |
228 | } |
229 | EXPORT_SYMBOL(kstrtos16); |
230 | |
231 | int kstrtou8(const char *s, unsigned int base, u8 *res) |
232 | { |
233 | unsigned long long tmp; |
234 | int rv; |
235 | |
236 | rv = kstrtoull(s, base, &tmp); |
237 | if (rv < 0) |
238 | return rv; |
239 | if (tmp != (unsigned long long)(u8)tmp) |
240 | return -ERANGE; |
241 | *res = tmp; |
242 | return 0; |
243 | } |
244 | EXPORT_SYMBOL(kstrtou8); |
245 | |
246 | int kstrtos8(const char *s, unsigned int base, s8 *res) |
247 | { |
248 | long long tmp; |
249 | int rv; |
250 | |
251 | rv = kstrtoll(s, base, &tmp); |
252 | if (rv < 0) |
253 | return rv; |
254 | if (tmp != (long long)(s8)tmp) |
255 | return -ERANGE; |
256 | *res = tmp; |
257 | return 0; |
258 | } |
259 | EXPORT_SYMBOL(kstrtos8); |
260 | |
261 | #define kstrto_from_user(f, g, type) \ |
262 | int f(const char __user *s, size_t count, unsigned int base, type *res) \ |
263 | { \ |
264 | /* sign, base 2 representation, newline, terminator */ \ |
265 | char buf[1 + sizeof(type) * 8 + 1 + 1]; \ |
266 | \ |
267 | count = min(count, sizeof(buf) - 1); \ |
268 | if (copy_from_user(buf, s, count)) \ |
269 | return -EFAULT; \ |
270 | buf[count] = '\0'; \ |
271 | return g(buf, base, res); \ |
272 | } \ |
273 | EXPORT_SYMBOL(f) |
274 | |
275 | kstrto_from_user(kstrtoull_from_user, kstrtoull, unsigned long long); |
276 | kstrto_from_user(kstrtoll_from_user, kstrtoll, long long); |
277 | kstrto_from_user(kstrtoul_from_user, kstrtoul, unsigned long); |
278 | kstrto_from_user(kstrtol_from_user, kstrtol, long); |
279 | kstrto_from_user(kstrtouint_from_user, kstrtouint, unsigned int); |
280 | kstrto_from_user(kstrtoint_from_user, kstrtoint, int); |
281 | kstrto_from_user(kstrtou16_from_user, kstrtou16, u16); |
282 | kstrto_from_user(kstrtos16_from_user, kstrtos16, s16); |
283 | kstrto_from_user(kstrtou8_from_user, kstrtou8, u8); |
284 | kstrto_from_user(kstrtos8_from_user, kstrtos8, s8); |
285 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9