usr/src/lib/libcurses/initscr.c

# include       "curses.ext"
# include       <signal.h>
# include       <sys/param.h>

extern char     *getenv();

/*
 *      This routine initializes the current and standard screen.
 *
 * %G% (Berkeley) @(#)initscr.c 1.3
 */
WINDOW *
initscr() {

        reg char        *sp;
        int             tstp();

# ifdef DEBUG
        fprintf(outf, "INITSCR()\n");
# endif
        if (My_term)
                setterm(Def_term);
        else {
                if (isatty(2))
                        _tty_ch = 2;
                else {
                        for (_tty_ch = 0; _tty_ch < NOFILE; _tty_ch++)
                                if (isatty(_tty_ch))
                                        break;
                }
                gettmode();
                if ((sp = getenv("TERM")) == NULL)
                        sp = Def_term;
                setterm(sp);
# ifdef DEBUG
                fprintf(outf, "INITSCR: term = %s\n", sp);
# endif
        }
        _puts(TI);
        _puts(VS);
# ifdef SIGTSTP
        signal(SIGTSTP, tstp);
# endif
        if (curscr != NULL) {
# ifdef DEBUG
                fprintf(outf, "INITSCR: curscr = 0%o\n", curscr);
# endif
                delwin(curscr);
        }
# ifdef DEBUG
        fprintf(outf, "LINES = %d, COLS = %d\n", LINES, COLS);
# endif
        if ((curscr = newwin(LINES, COLS, 0, 0)) == ERR)
                return ERR;
        curscr->_clear = TRUE;
        if (stdscr != NULL) {
# ifdef DEBUG
                fprintf(outf, "INITSCR: stdscr = 0%o\n", stdscr);
# endif
                delwin(stdscr);
        }
        stdscr = newwin(LINES, COLS, 0, 0);
        return stdscr;
}