Root/
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 | |
21 | static inline char _tolower(const char c) |
22 | { |
23 | return c | 0x20; |
24 | } |
25 | |
26 | static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res) |
27 | { |
28 | unsigned long long acc; |
29 | int ok; |
30 | |
31 | if (base == 0) { |
32 | if (s[0] == '0') { |
33 | if (_tolower(s[1]) == 'x' && isxdigit(s[2])) |
34 | base = 16; |
35 | else |
36 | base = 8; |
37 | } else |
38 | base = 10; |
39 | } |
40 | if (base == 16 && s[0] == '0' && _tolower(s[1]) == 'x') |
41 | s += 2; |
42 | |
43 | acc = 0; |
44 | ok = 0; |
45 | while (*s) { |
46 | unsigned int val; |
47 | |
48 | if ('0' <= *s && *s <= '9') |
49 | val = *s - '0'; |
50 | else if ('a' <= _tolower(*s) && _tolower(*s) <= 'f') |
51 | val = _tolower(*s) - 'a' + 10; |
52 | else if (*s == '\n' && *(s + 1) == '\0') |
53 | break; |
54 | else |
55 | return -EINVAL; |
56 | |
57 | if (val >= base) |
58 | return -EINVAL; |
59 | if (acc > div_u64(ULLONG_MAX - val, base)) |
60 | return -ERANGE; |
61 | acc = acc * base + val; |
62 | ok = 1; |
63 | |
64 | s++; |
65 | } |
66 | if (!ok) |
67 | return -EINVAL; |
68 | *res = acc; |
69 | return 0; |
70 | } |
71 | |
72 | int kstrtoull(const char *s, unsigned int base, unsigned long long *res) |
73 | { |
74 | if (s[0] == '+') |
75 | s++; |
76 | return _kstrtoull(s, base, res); |
77 | } |
78 | EXPORT_SYMBOL(kstrtoull); |
79 | |
80 | int kstrtoll(const char *s, unsigned int base, long long *res) |
81 | { |
82 | unsigned long long tmp; |
83 | int rv; |
84 | |
85 | if (s[0] == '-') { |
86 | rv = _kstrtoull(s + 1, base, &tmp); |
87 | if (rv < 0) |
88 | return rv; |
89 | if ((long long)(-tmp) >= 0) |
90 | return -ERANGE; |
91 | *res = -tmp; |
92 | } else { |
93 | rv = kstrtoull(s, base, &tmp); |
94 | if (rv < 0) |
95 | return rv; |
96 | if ((long long)tmp < 0) |
97 | return -ERANGE; |
98 | *res = tmp; |
99 | } |
100 | return 0; |
101 | } |
102 | EXPORT_SYMBOL(kstrtoll); |
103 | |
104 | /* Internal, do not use. */ |
105 | int _kstrtoul(const char *s, unsigned int base, unsigned long *res) |
106 | { |
107 | unsigned long long tmp; |
108 | int rv; |
109 | |
110 | rv = kstrtoull(s, base, &tmp); |
111 | if (rv < 0) |
112 | return rv; |
113 | if (tmp != (unsigned long long)(unsigned long)tmp) |
114 | return -ERANGE; |
115 | *res = tmp; |
116 | return 0; |
117 | } |
118 | EXPORT_SYMBOL(_kstrtoul); |
119 | |
120 | /* Internal, do not use. */ |
121 | int _kstrtol(const char *s, unsigned int base, long *res) |
122 | { |
123 | long long tmp; |
124 | int rv; |
125 | |
126 | rv = kstrtoll(s, base, &tmp); |
127 | if (rv < 0) |
128 | return rv; |
129 | if (tmp != (long long)(long)tmp) |
130 | return -ERANGE; |
131 | *res = tmp; |
132 | return 0; |
133 | } |
134 | EXPORT_SYMBOL(_kstrtol); |
135 | |
136 | int kstrtouint(const char *s, unsigned int base, unsigned int *res) |
137 | { |
138 | unsigned long long tmp; |
139 | int rv; |
140 | |
141 | rv = kstrtoull(s, base, &tmp); |
142 | if (rv < 0) |
143 | return rv; |
144 | if (tmp != (unsigned long long)(unsigned int)tmp) |
145 | return -ERANGE; |
146 | *res = tmp; |
147 | return 0; |
148 | } |
149 | EXPORT_SYMBOL(kstrtouint); |
150 | |
151 | int kstrtoint(const char *s, unsigned int base, int *res) |
152 | { |
153 | long long tmp; |
154 | int rv; |
155 | |
156 | rv = kstrtoll(s, base, &tmp); |
157 | if (rv < 0) |
158 | return rv; |
159 | if (tmp != (long long)(int)tmp) |
160 | return -ERANGE; |
161 | *res = tmp; |
162 | return 0; |
163 | } |
164 | EXPORT_SYMBOL(kstrtoint); |
165 | |
166 | int kstrtou16(const char *s, unsigned int base, u16 *res) |
167 | { |
168 | unsigned long long tmp; |
169 | int rv; |
170 | |
171 | rv = kstrtoull(s, base, &tmp); |
172 | if (rv < 0) |
173 | return rv; |
174 | if (tmp != (unsigned long long)(u16)tmp) |
175 | return -ERANGE; |
176 | *res = tmp; |
177 | return 0; |
178 | } |
179 | EXPORT_SYMBOL(kstrtou16); |
180 | |
181 | int kstrtos16(const char *s, unsigned int base, s16 *res) |
182 | { |
183 | long long tmp; |
184 | int rv; |
185 | |
186 | rv = kstrtoll(s, base, &tmp); |
187 | if (rv < 0) |
188 | return rv; |
189 | if (tmp != (long long)(s16)tmp) |
190 | return -ERANGE; |
191 | *res = tmp; |
192 | return 0; |
193 | } |
194 | EXPORT_SYMBOL(kstrtos16); |
195 | |
196 | int kstrtou8(const char *s, unsigned int base, u8 *res) |
197 | { |
198 | unsigned long long tmp; |
199 | int rv; |
200 | |
201 | rv = kstrtoull(s, base, &tmp); |
202 | if (rv < 0) |
203 | return rv; |
204 | if (tmp != (unsigned long long)(u8)tmp) |
205 | return -ERANGE; |
206 | *res = tmp; |
207 | return 0; |
208 | } |
209 | EXPORT_SYMBOL(kstrtou8); |
210 | |
211 | int kstrtos8(const char *s, unsigned int base, s8 *res) |
212 | { |
213 | long long tmp; |
214 | int rv; |
215 | |
216 | rv = kstrtoll(s, base, &tmp); |
217 | if (rv < 0) |
218 | return rv; |
219 | if (tmp != (long long)(s8)tmp) |
220 | return -ERANGE; |
221 | *res = tmp; |
222 | return 0; |
223 | } |
224 | EXPORT_SYMBOL(kstrtos8); |
225 |
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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