| 1 | #include <string.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <limits.h> |
| 4 | |
| 5 | #include "strntol.h" |
| 6 | |
| 7 | long strntol(const char *str, size_t sz, char **end, int base) |
| 8 | { |
| 9 | /* Expect that digit representation of LONG_MAX/MIN |
| 10 | * not greater than this buffer */ |
| 11 | char buf[24]; |
| 12 | long ret; |
| 13 | const char *beg = str; |
| 14 | |
| 15 | /* Catch up leading spaces */ |
| 16 | for (; beg && sz && *beg == ' '; beg++, sz--) |
| 17 | ; |
| 18 | |
| 19 | if (!sz || sz >= sizeof(buf)) { |
| 20 | if (end) |
| 21 | *end = (char *)str; |
| 22 | return 0; |
| 23 | } |
| 24 | |
| 25 | memcpy(buf, beg, sz); |
| 26 | buf[sz] = '\0'; |
| 27 | ret = strtol(buf, end, base); |
| 28 | if (ret == LONG_MIN || ret == LONG_MAX) |
| 29 | return ret; |
| 30 | if (end) |
| 31 | *end = (char *)beg + (*end - buf); |
| 32 | return ret; |
| 33 | } |