libcurses/screen/winnwstr.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 (c) 1988 AT&T */
/*    All Rights Reserved   */


/*
 *      Copyright (c) 1997, by Sun Microsystems, Inc.
 *      All rights reserved.
 */

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

/*LINTLIBRARY*/

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

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

int
winnwstr(WINDOW *win, wchar_t *wstr, int ncols)
{
    int counter = 0;
    int cy = win->_cury;
    chtype  *ptr = &(win->_y[cy][win->_curx]),
        *pmax = &(win->_y[cy][win->_maxx]);
    wchar_t wc, *cp;
    int scrw, s;
    char    cbuf[CSMAX+1];


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

    if (ncols < -1)
        ncols = MAXINT;

    while (counter < ncols) {
        wc = RBYTE(*ptr);
        scrw = mbscrw((int) wc);
        (void) mbeucw((int) wc);
        /* LINTED */
        cp = (wchar_t *)cbuf;
        for (s = 0; s < scrw; s++, ptr++) {
            if ((wc = RBYTE(*ptr)) == MBIT)
                continue;
            *cp++ = wc;
            if ((wc = LBYTE(*ptr) | MBIT) == MBIT)
                continue;
            *cp++ = wc;
        }
        *cp = (char)0;

        if (_curs_mbtowc(&wc, cbuf, CSMAX) <= 0)
            break;

        *wstr++ = wc;
        counter++;

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

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

    return (counter);
}