libcurses/screen/winnstr.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1988 AT&T */
/*    All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

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

/*LINTLIBRARY*/

#include    <sys/types.h>
#include    "curses_inc.h"

/*
 * Copy n chars in window win from current cursor position to end
 * of window into char buffer str.  Return the number of chars copied.
 */

int
winnstr(WINDOW *win, char *str, int ncols)
{
    int counter = 0;
    int cy = win->_cury;
    chtype  *ptr = &(win->_y[cy][win->_curx]),
        *pmax = &(win->_y[cy][win->_maxx]);
    chtype  wc;
    int eucw, scrw, s;


    while (ISCBIT(*ptr))
        ptr--;

    if (ncols < -1)
        ncols = MAXINT;

    while (counter < ncols) {
        scrw = mbscrw((int) RBYTE(*ptr));
        eucw = mbeucw((int) RBYTE(*ptr));
        if (counter + eucw > ncols)
            break;

        for (s = 0; s < scrw; s++, ptr++) {
            if ((wc = RBYTE(*ptr)) == MBIT)
                continue;
            /* LINTED */
            *str++ = (char) wc;
            counter++;
            if ((wc = LBYTE(*ptr) | MBIT) == MBIT)
                continue;
            /* LINTED */
            *str++ = (char) wc;
            counter++;
        }

        if (ptr >= pmax) {
            if (++cy == win->_maxy)
                break;

            ptr = &(win->_y[cy][0]);
            pmax = ptr + win->_maxx;
        }
    }
    if (counter < ncols)
        *str = '\0';

    return (counter);
}