argtoi
lfmode = argtoi('m', "mode", optarg, 8);
static int argtoi(int flag, char *req, char *str, int base);
bflag = argtoi('b', "number", optarg, 10);
cvtlevel = argtoi('c', "conversion level", optarg, 10);
maxrun = argtoi('l', "number", optarg, 10);
d_arg = argtoi(optarg, 0, 0xff, 'd');
m_arg = argtoi(optarg, 0, 0xf, 'm');
s_arg = argtoi(optarg, 1, 5, 's');
t_arg = argtoi(optarg, 1, 0xffff, 't');
static int argtoi(const char *, int, int, int);