Function terminal_set

extern/editline/src/terminal.c:857–939

terminal_set(): * Read in the terminal capabilities from the requested terminal */

 *	Read in the terminal capabilities from the requested terminal
 */
protected int
terminal_set(EditLine *el, const char *term)
{
	int i;
	char buf[TC_BUFSIZE];
	char *area;
	const struct termcapstr *t;
	sigset_t oset, nset;
	int lins, cols;

	(void) sigemptyset(&nset);
	(void) sigaddset(&nset, SIGWINCH);
	(void) sigprocmask(SIG_BLOCK, &nset, &oset);

	area = buf;


	if (term == NULL)
		term = getenv("TERM");

	if (!term || !term[0])
		term = "dumb";

	if (strcmp(term, "emacs") == 0)
		el->el_flags |= EDIT_DISABLED;

	(void) memset(el->el_terminal.t_cap, 0, TC_BUFSIZE);

	i = tgetent(el->el_terminal.t_cap, term);

	if (i <= 0) {
		if (i == -1)
			(void) fprintf(el->el_errfile,
			    "Cannot read termcap database;\n");
		else if (i == 0)
			(void) fprintf(el->el_errfile,
			    "No entry for terminal type \"%s\";\n", term);
		(void) fprintf(el->el_errfile,
		    "using dumb terminal settings.\n");
		Val(T_co) = 80;	/* do a dumb terminal */
		Val(T_pt) = Val(T_km) = Val(T_li) = 0;
		Val(T_xt) = Val(T_MT);
		for (t = tstr; t->name != NULL; t++)
			terminal_alloc(el, t, NULL);
	} else {
		/* auto/magic margins */
		Val(T_am) = tgetflag("am");
		Val(T_xn) = tgetflag("xn");
		/* Can we tab */
		Val(T_pt) = tgetflag("pt");
		Val(T_xt) = tgetflag("xt");
		/* do we have a meta? */
		Val(T_km) = tgetflag("km");
		Val(T_MT) = tgetflag("MT");
		/* Get the size */
		Val(T_co) = tgetnum("co");
		Val(T_li) = tgetnum("li");
		for (t = tstr; t->name != NULL; t++) {