cl_getcap
(void)cl_getcap(sp, "smcup", &clp->smcup);
(void)cl_getcap(sp, "rmcup", &clp->rmcup);
(void)cl_getcap(sp, "cup", &clp->cup);
(void)cl_getcap(sp, "smso", &clp->smso);
(void)cl_getcap(sp, "rmso", &clp->rmso);
(void)cl_getcap(sp, "el", &clp->el);
(void)cl_getcap(sp, "cuu1", &clp->cuu1);
int cl_getcap(SCR *, char *, char **);