Function tty_setup

extern/editline/src/tty.c:494–562

tty_setup(): * Get the tty parameters and initialize the editing state */

 *	Get the tty parameters and initialize the editing state
 */
private int
tty_setup(EditLine *el)
{
	int rst = 1;

	if (el->el_flags & EDIT_DISABLED)
		return 0;

	if (!isatty(el->el_outfd)) {
#ifdef DEBUG_TTY
		(void) fprintf(el->el_errfile, "%s: isatty: %s\n", __func__,
		    strerror(errno));
#endif /* DEBUG_TTY */
		return -1;
	}
	if (tty_getty(el, &el->el_tty.t_or) == -1) {
#ifdef DEBUG_TTY
		(void) fprintf(el->el_errfile, "%s: tty_getty: %s\n", __func__,
		    strerror(errno));
#endif /* DEBUG_TTY */
		return -1;
	}
	el->el_tty.t_ts = el->el_tty.t_ex = el->el_tty.t_ed = el->el_tty.t_or;

	el->el_tty.t_speed = tty__getspeed(&el->el_tty.t_ex);
	el->el_tty.t_tabs = tty__gettabs(&el->el_tty.t_ex);
	el->el_tty.t_eight = tty__geteightbit(&el->el_tty.t_ex);

	tty_setup_flags(el, &el->el_tty.t_ex, EX_IO);

	/*
         * Reset the tty chars to reasonable defaults
         * If they are disabled, then enable them.
         */
	if (rst) {
		if (tty__cooked_mode(&el->el_tty.t_ts)) {
			tty__getchar(&el->el_tty.t_ts, el->el_tty.t_c[TS_IO]);
			/*
	                 * Don't affect CMIN and CTIME for the editor mode
	                 */
			for (rst = 0; rst < C_NCC - 2; rst++)
				if (el->el_tty.t_c[TS_IO][rst] !=
				      el->el_tty.t_vdisable
				    && el->el_tty.t_c[ED_IO][rst] !=
				      el->el_tty.t_vdisable)
					el->el_tty.t_c[ED_IO][rst] =
					    el->el_tty.t_c[TS_IO][rst];
			for (rst = 0; rst < C_NCC; rst++)
				if (el->el_tty.t_c[TS_IO][rst] !=
				    el->el_tty.t_vdisable)
					el->el_tty.t_c[EX_IO][rst] =
					    el->el_tty.t_c[TS_IO][rst];
		}
		tty__setchar(&el->el_tty.t_ex, el->el_tty.t_c[EX_IO]);
		if (tty_setty(el, TCSADRAIN, &el->el_tty.t_ex) == -1) {
#ifdef DEBUG_TTY
			(void) fprintf(el->el_errfile, "%s: tty_setty: %s\n",
			    __func__, strerror(errno));