| 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') { |
| 53 | if (*(s + 1) == '\0') |
| 54 | break; |
| 55 | else |
| 56 | return -EINVAL; |
| 57 | } else |
| 58 | return -EINVAL; |
| 59 | |
| 60 | if (val >= base) |
| 61 | return -EINVAL; |
| 62 | if (acc > div_u64(ULLONG_MAX - val, base)) |
| 63 | return -ERANGE; |
| 64 | acc = acc * base + val; |
| 65 | ok = 1; |
| 66 | |
| 67 | s++; |
| 68 | } |
| 69 | if (!ok) |
| 70 | return -EINVAL; |
| 71 | *res = acc; |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | int kstrtoull(const char *s, unsigned int base, unsigned long long *res) |
| 76 | { |
| 77 | if (s[0] == '+') |
| 78 | s++; |
| 79 | return _kstrtoull(s, base, res); |
| 80 | } |
| 81 | EXPORT_SYMBOL(kstrtoull); |
| 82 | |
| 83 | int kstrtoll(const char *s, unsigned int base, long long *res) |
| 84 | { |
| 85 | unsigned long long tmp; |
| 86 | int rv; |
| 87 | |
| 88 | if (s[0] == '-') { |
| 89 | rv = _kstrtoull(s + 1, base, &tmp); |
| 90 | if (rv < 0) |
| 91 | return rv; |
| 92 | if ((long long)(-tmp) >= 0) |
| 93 | return -ERANGE; |
| 94 | *res = -tmp; |
| 95 | } else { |
| 96 | rv = kstrtoull(s, base, &tmp); |
| 97 | if (rv < 0) |
| 98 | return rv; |
| 99 | if ((long long)tmp < 0) |
| 100 | return -ERANGE; |
| 101 | *res = tmp; |
| 102 | } |
| 103 | return 0; |
| 104 | } |
| 105 | EXPORT_SYMBOL(kstrtoll); |
| 106 | |
| 107 | /* Internal, do not use. */ |
| 108 | int _kstrtoul(const char *s, unsigned int base, unsigned long *res) |
| 109 | { |
| 110 | unsigned long long tmp; |
| 111 | int rv; |
| 112 | |
| 113 | rv = kstrtoull(s, base, &tmp); |
| 114 | if (rv < 0) |
| 115 | return rv; |
| 116 | if (tmp != (unsigned long long)(unsigned long)tmp) |
| 117 | return -ERANGE; |
| 118 | *res = tmp; |
| 119 | return 0; |
| 120 | } |
| 121 | EXPORT_SYMBOL(_kstrtoul); |
| 122 | |
| 123 | /* Internal, do not use. */ |
| 124 | int _kstrtol(const char *s, unsigned int base, long *res) |
| 125 | { |
| 126 | long long tmp; |
| 127 | int rv; |
| 128 | |
| 129 | rv = kstrtoll(s, base, &tmp); |
| 130 | if (rv < 0) |
| 131 | return rv; |
| 132 | if (tmp != (long long)(long)tmp) |
| 133 | return -ERANGE; |
| 134 | *res = tmp; |
| 135 | return 0; |
| 136 | } |
| 137 | EXPORT_SYMBOL(_kstrtol); |
| 138 | |
| 139 | int kstrtouint(const char *s, unsigned int base, unsigned int *res) |
| 140 | { |
| 141 | unsigned long long tmp; |
| 142 | int rv; |
| 143 | |
| 144 | rv = kstrtoull(s, base, &tmp); |
| 145 | if (rv < 0) |
| 146 | return rv; |
| 147 | if (tmp != (unsigned long long)(unsigned int)tmp) |
| 148 | return -ERANGE; |
| 149 | *res = tmp; |
| 150 | return 0; |
| 151 | } |
| 152 | EXPORT_SYMBOL(kstrtouint); |
| 153 | |
| 154 | int kstrtoint(const char *s, unsigned int base, int *res) |
| 155 | { |
| 156 | long long tmp; |
| 157 | int rv; |
| 158 | |
| 159 | rv = kstrtoll(s, base, &tmp); |
| 160 | if (rv < 0) |
| 161 | return rv; |
| 162 | if (tmp != (long long)(int)tmp) |
| 163 | return -ERANGE; |
| 164 | *res = tmp; |
| 165 | return 0; |
| 166 | } |
| 167 | EXPORT_SYMBOL(kstrtoint); |
| 168 | |
| 169 | int kstrtou16(const char *s, unsigned int base, u16 *res) |
| 170 | { |
| 171 | unsigned long long tmp; |
| 172 | int rv; |
| 173 | |
| 174 | rv = kstrtoull(s, base, &tmp); |
| 175 | if (rv < 0) |
| 176 | return rv; |
| 177 | if (tmp != (unsigned long long)(u16)tmp) |
| 178 | return -ERANGE; |
| 179 | *res = tmp; |
| 180 | return 0; |
| 181 | } |
| 182 | EXPORT_SYMBOL(kstrtou16); |
| 183 | |
| 184 | int kstrtos16(const char *s, unsigned int base, s16 *res) |
| 185 | { |
| 186 | long long tmp; |
| 187 | int rv; |
| 188 | |
| 189 | rv = kstrtoll(s, base, &tmp); |
| 190 | if (rv < 0) |
| 191 | return rv; |
| 192 | if (tmp != (long long)(s16)tmp) |
| 193 | return -ERANGE; |
| 194 | *res = tmp; |
| 195 | return 0; |
| 196 | } |
| 197 | EXPORT_SYMBOL(kstrtos16); |
| 198 | |
| 199 | int kstrtou8(const char *s, unsigned int base, u8 *res) |
| 200 | { |
| 201 | unsigned long long tmp; |
| 202 | int rv; |
| 203 | |
| 204 | rv = kstrtoull(s, base, &tmp); |
| 205 | if (rv < 0) |
| 206 | return rv; |
| 207 | if (tmp != (unsigned long long)(u8)tmp) |
| 208 | return -ERANGE; |
| 209 | *res = tmp; |
| 210 | return 0; |
| 211 | } |
| 212 | EXPORT_SYMBOL(kstrtou8); |
| 213 | |
| 214 | int kstrtos8(const char *s, unsigned int base, s8 *res) |
| 215 | { |
| 216 | long long tmp; |
| 217 | int rv; |
| 218 | |
| 219 | rv = kstrtoll(s, base, &tmp); |
| 220 | if (rv < 0) |
| 221 | return rv; |
| 222 | if (tmp != (long long)(s8)tmp) |
| 223 | return -ERANGE; |
| 224 | *res = tmp; |
| 225 | return 0; |
| 226 | } |
| 227 | EXPORT_SYMBOL(kstrtos8); |