_parse_integer
rv = _parse_integer(s, base, &_res);
len = _parse_integer(str, 16, &sval);
len = _parse_integer(str, 16, &eval);
val_len = _parse_integer(cur_buf, base, res);
rv = _parse_integer(cp, base, &result);
len = _parse_integer(str, 10, &n);
rv = _parse_integer(s, base, &_res);
unsigned int _parse_integer(const char *s, unsigned int base, unsigned long long *res);