dot_quad_addr
if (dot_quad_addr(pat) == INADDR_NONE
|| dot_quad_addr(mask) == INADDR_NONE)
if ((addr = dot_quad_addr(string)) == INADDR_NONE)
if ((net = dot_quad_addr(net_tok)) == INADDR_NONE
|| (mask = dot_quad_addr(mask_tok)) == INADDR_NONE) {
addr->ga_in.s_addr = dot_quad_addr(str);
extern unsigned long dot_quad_addr(); /* restricted inet_addr() */