usr/src/ucblib/libcurses/scroll.c

   1 /*
   2  * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
   7 /*        All Rights Reserved   */
   8
   9 /*
  10  * Copyright (c) 1980 Regents of the University of California.
  11  * All rights reserved.  The Berkeley software License Agreement
  12  * specifies the terms and conditions for redistribution.
  13  */
  14
  15 #pragma ident   "%Z%%M% %I%     %E% SMI"
  16
  17 /*LINTLIBRARY*/
  18
  19 #ifndef lint
  20 static char
  21 sccsid[] = "@(#)scroll.c 1.6 88/02/08 SMI"; /* from UCB 5.1 85/06/07 */
  22 #endif /* not lint */
  23
  24 #include        "curses.ext"
  25
  26 /*
  27  *      This routine scrolls the window up a line.
  28  */
  29
  30 int
  31 scroll(WINDOW *win)
  32 {
  33         int     oy, ox;
  34
  35 #ifdef DEBUG
  36         fprintf(outf, "SCROLL(%0.2o)\n", win);
  37 #endif
  38
  39         if (!win->_scroll)
  40                 return (ERR);
  41
  42         getyx(win, oy, ox);
  43         (void) wmove(win, 0, 0);
  44         (void) wdeleteln(win);
  45         (void) wmove(win, oy, ox);
  46
  47         if (win == curscr) {
  48                 (void) _putchar('\n');
  49                 if (!NONL)
  50                         win->_curx = 0;
  51 #ifdef DEBUG
  52                 fprintf(outf, "SCROLL: win == curscr\n");
  53 #endif
  54         }
  55
  56         return (OK);
  57 }