libcurses/screen/winwchnstr.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"

/*
 * Read in ncols worth of data from window win and assign the
 * chars to string. NULL terminate string upon completion.
 * Return the number of chtypes copied.
 */

int
winwchnstr(WINDOW *win, chtype *string, int ncols)
{
    chtype  *ptr = &(win->_y[win->_cury][win->_curx]);
    int counter = 0;
    int maxcols = win->_maxx - win->_curx;
    int scrw, s, wc;
    char    *mp, mbbuf[CSMAX+1];
    wchar_t wch;
    chtype  rawc;
    chtype  attr;

    if (ncols < 0)
        ncols = MAXINT;

    while (ISCBIT(*ptr)) {
        ptr--;
        maxcols++;
    }

    while ((counter < ncols) && maxcols > 0) {
        attr = *ptr & A_WATTRIBUTES;
        rawc = *ptr & A_WCHARTEXT;
        (void) mbeucw((int)RBYTE(rawc));
        scrw = mbscrw((int)RBYTE(rawc));
        for (mp = mbbuf, s = 0; s < scrw; s++, maxcols--, ptr++) {
            if ((wc = (int)RBYTE(rawc)) == MBIT)
                continue;
            /* LINTED */
            *mp++ = (char) wc;
            if ((wc = (int)(LBYTE(rawc) | MBIT)) == MBIT)
                continue;
            /* LINTED */
            *mp++ = (char) wc;
        }
        *mp = '\0';
        if (_curs_mbtowc(&wch, mbbuf, CSMAX) <= 0)
            break;
        *string++ = wch | attr;
        counter++;
    }
    if (counter < ncols)
        *string = (chtype) 0;
    return (counter);
}