/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
/*        All Rights Reserved   */

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char
sccsid[] = "@(#)addch.c 1.6 88/02/08 SMI"; /* from UCB 5.1 85/06/07 */
#endif  /* not lint */

#include        "curses.ext"

/* forward declaration */
static void set_ch(WINDOW *, int, int, int);

/*
 *      This routine adds the character to the current position
 */

int
waddch(WINDOW *win, char c)
{
        int             x, y;
        int             newx;

        x = win->_curx;
        y = win->_cury;
#ifdef FULLDEBUG
        fprintf(outf, "ADDCH('%c') at (%d, %d)\n", c, y, x);
#endif
        switch (c) {
        case '\t':
                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);
                win->_y[y][x++] = c;
                if (x >= win->_maxx) {
                        x = 0;
newline:
                        if (++y >= win->_maxy)
                                if (win->_scroll) {
                                        (void) 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':
                (void) wclrtoeol(win);
                if (!NONL)
                        x = 0;
                goto newline;
        case '\r':
                x = 0;
                break;
        case '\b':
                if (--x < 0)
                        x = 0;
                break;
        }
        win->_curx = (short)x;
        win->_cury = (short)y;
        return (OK);
}

/*
 * set_ch:
 *      Set the first and last change flags for this window.
 */

static void
set_ch(WINDOW *win, int y, int x, int ch)
{
#ifdef  FULLDEBUG
        fprintf(outf, "SET_CH(%0.2o, %d, %d)\n", win, y, x);
#endif
        if (win->_y[y][x] != ch) {
                x += win->_ch_off;
                if (win->_firstch[y] == _NOCHANGE)
                        win->_firstch[y] = win->_lastch[y] = (short)x;
                else if (x < win->_firstch[y])
                        win->_firstch[y] = (short)x;
                else if (x > win->_lastch[y])
                        win->_lastch[y] = (short)x;
#ifdef FULLDEBUG
                fprintf(outf, "SET_CH: change gives f/l: %d/%d [%d/%d]\n",
                    win->_firstch[y], win->_lastch[y],
                    win->_firstch[y] - win->_ch_off,
                    win->_lastch[y] - win->_ch_off);
#endif
        }
}