date and time created 83/05/31 00:19:54 by sam

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

# include       "curses.ext"

/*
*      This routine adds the character to the current position
*
* @(#)addch.c  1.5 (Berkeley) %G%
*/
waddch(win, c)
reg WINDOW      *win;
char            c;
{
       reg int         x, y;
       reg WINDOW      *wp;

       x = win->_curx;
       y = win->_cury;
# ifdef FULLDEBUG
       fprintf(outf, "ADDCH('%c') at (%d, %d)\n", c, y, x);
# endif
       if (y >= win->_maxy || x >= win->_maxx || y < 0 || x < 0)
               return ERR;
       switch (c) {
         case '\t':
         {
               reg int         newx;

               for (newx = x + (8 - (x & 07)); x < newx; x++)
                       if (waddch(win, ' ') == ERR)
                               return ERR;
               return OK;
         }

         default:
# ifdef FULLDEBUG
               fprintf(outf, "ADDCH: 1: y = %d, x = %d, firstch = %d, lastch = %d\n", y, x, win->_firstch[y], win->_lastch[y]);
# endif
               if (win->_flags & _STANDOUT)
                       c |= _STANDOUT;
               set_ch(win, y, x, c, NULL);
               for (wp = win->_nextp; wp != win; wp = wp->_nextp)
                       set_ch(wp, y, x, c, win);
               win->_y[y][x++] = c;
               if (x >= win->_maxx) {
                       x = 0;
newline:
                       if (++y >= win->_maxy)
                               if (win->_scroll) {
                                       wrefresh(win);
                                       scroll(win);
                                       --y;
                               }
                               else
                                       return ERR;
               }
# ifdef FULLDEBUG
               fprintf(outf, "ADDCH: 2: y = %d, x = %d, firstch = %d, lastch = %d\n", y, x, win->_firstch[y], win->_lastch[y]);
# endif
               break;
         case '\n':
               wclrtoeol(win);
               if (!NONL)
                       x = 0;
               goto newline;
         case '\r':
               x = 0;
               break;
         case '\b':
               if (--x < 0)
                       x = 0;
               break;
       }
       win->_curx = x;
       win->_cury = y;
       return OK;
}

/*
* set_ch:
*      Set the first and last change flags for this window.
*/
static
set_ch(win, y, x, ch, orig)
reg WINDOW      *win;
int             y, x;
WINDOW          *orig; {

       if (orig != NULL) {
               y -= win->_begy - orig->_begy;
               x -= win->_begx - orig->_begx;
       }
       if (y < 0 || y >= win->_maxy || x < 0 || x >= win->_maxx)
               return;
       if (win->_y[y][x] != ch) {
               if (win->_firstch[y] == _NOCHANGE)
                       win->_firstch[y] = win->_lastch[y] = x;
               else if (x < win->_firstch[y])
                       win->_firstch[y] = x;
               else if (x > win->_lastch[y])
                       win->_lastch[y] = x;
       }
}