Added check for no HO or CM since without them we can't refresh.

[unix-history] / usr / src / lib / libcurses / initscr.c

/*
* Copyright (c) 1981 Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)initscr.c   5.9 (Berkeley) %G%";
#endif  /* not lint */

#include <curses.h>
#include <signal.h>
#include <stdlib.h>

/*
* initscr --
*      Initialize the current and standard screen.
*/
WINDOW *
initscr()
{
       register char *sp;

#ifdef DEBUG
       __TRACE("initscr\n");
#endif
       if (My_term) {
               if (setterm(Def_term) == ERR)
                       return (NULL);
       } else {
               gettmode();
               if ((sp = getenv("TERM")) == NULL)
                       sp = Def_term;
               if (setterm(sp) == ERR)
                       return (NULL);
#ifdef DEBUG
               __TRACE("initscr: term = %s\n", sp);
#endif
       }
       /* Need either homing or cursor motion for refreshes */
       if (!HO && !CM) 
               return(NULL);
       tputs(TI, 0, __cputchar);
       tputs(VS, 0, __cputchar);
       (void)signal(SIGTSTP, tstp);
       if (curscr != NULL) {
#ifdef DEBUG
               __TRACE("initscr: curscr = 0%o\n", curscr);
#endif
               delwin(curscr);
       }
#ifdef DEBUG
       __TRACE("initscr: LINES = %d, COLS = %d\n", LINES, COLS);
#endif
       if ((curscr = newwin(LINES, COLS, 0, 0)) == ERR)
               return (NULL);
       clearok(curscr, 1);
       curscr->flags &= ~__FULLLINE;
       if (stdscr != NULL) {
#ifdef DEBUG
               __TRACE("initscr: stdscr = 0%o\n", stdscr);
#endif
               delwin(stdscr);
       }
       return(stdscr = newwin(LINES, COLS, 0, 0));
}