usr/src/ucblib/libcurses/erase.c

   1 /*
   2  * Copyright 2004 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[] = "@(#)erase.c 1.6 88/02/08 SMI"; /* from UCB 5.1 85/06/07 */
  22 #endif  /* not lint */
  23
  24 #include        <stddef.h>
  25 #include        "curses.ext"
  26
  27 /*
  28  *      This routine erases everything on the window.
  29  */
  30
  31 int
  32 werase(WINDOW *win)
  33 {
  34         int     y;
  35         char    *sp, *end, *start, *maxx;
  36         ptrdiff_t       minx;
  37
  38 #ifdef DEBUG
  39         fprintf(outf, "WERASE(%0.2o)\n", win);
  40 #endif
  41         for (y = 0; y < win->_maxy; y++) {
  42                 minx = _NOCHANGE;
  43                 start = win->_y[y];
  44                 end = &start[win->_maxx];
  45                 for (sp = start; sp < end; sp++)
  46                         if (*sp != ' ') {
  47                                 maxx = sp;
  48                                 if (minx == _NOCHANGE)
  49                                         minx = sp - start;
  50                                 *sp = ' ';
  51                         }
  52                 if (minx != _NOCHANGE)
  53                         (void) touchline(win, y, (int)minx,
  54                                 (int)(maxx - win->_y[y]));
  55         }
  56         win->_curx = win->_cury = 0;
  57         return (OK);
  58 }