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

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

#ifndef lint
static char sccsid[] = "@(#)erase.c     5.4 (Berkeley) %G%";
#endif /* not lint */

# include       "curses.ext"

/*
*      This routine erases everything on the window.
*
*/
werase(win)
reg WINDOW      *win; {

       reg int         y;
       reg char        *sp, *end, *start, *maxx;
       reg int         minx;

# ifdef DEBUG
       fprintf(outf, "WERASE(%0.2o)\n", win);
# endif
       for (y = 0; y < win->_maxy; y++) {
               minx = _NOCHANGE;
               start = win->_y[y];
               end = &start[win->_maxx];
               for (sp = start; sp < end; sp++)
                       if (*sp != ' ') {
                               maxx = sp;
                               if (minx == _NOCHANGE)
                                       minx = sp - start;
                               *sp = ' ';
                       }
               if (minx != _NOCHANGE)
                       touchline(win, y, minx, maxx - win->_y[y]);
       }
       win->_curx = win->_cury = 0;
}