| Damien George | fbea810 | 2014-11-28 14:58:25 +0000 | [diff] [blame] | 1 | #include <stdlib.h> |
| 2 | |
| 3 | // assumes endptr != NULL |
| 4 | // doesn't check for sign |
| 5 | // doesn't check for base-prefix |
| 6 | long long int strtoll(const char *nptr, char **endptr, int base) { |
| 7 | long long val = 0; |
| 8 | |
| 9 | for (; *nptr; nptr++) { |
| 10 | int v = *nptr; |
| 11 | if ('0' <= v && v <= '9') { |
| 12 | v -= '0'; |
| 13 | } else if ('A' <= v && v <= 'Z') { |
| 14 | v -= 'A' - 10; |
| 15 | } else if ('a' <= v && v <= 'z') { |
| 16 | v -= 'a' - 10; |
| 17 | } else { |
| 18 | break; |
| 19 | } |
| 20 | if (v >= base) { |
| 21 | break; |
| 22 | } |
| 23 | val = val * base + v; |
| 24 | } |
| 25 | |
| 26 | *endptr = (char*)nptr; |
| 27 | |
| 28 | return val; |
| 29 | } |