ucblib/libcurses/addch.c

/*
 * 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.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#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
    }
}