return;
return 0;
static void telnet_send(char *buf, int len){    char *p;    static unsigned char iac[2] = { IAC, IAC };    static unsigned char cr[2] = { CR, NUL };#if 0    static unsigned char nl[2] = { CR, LF };#endif    if (s == NULL)	return;    p = buf;    while (p < buf + len) {	char *q = p;	while (iswritable((unsigned char) *p) && p < buf + len)	    p++;	sk_write(s, q, p - q);	while (p < buf + len && !iswritable((unsigned char) *p)) {	    sk_write(s, (unsigned char) *p == IAC ? iac : cr, 2);	    p++;	}    }}