libc/xcurses/wins_wch.c

	wins_wch.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * 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) 1995-1998 by Sun Microsystems, Inc.
 * All rights reserved.
 */

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

/* LINTLIBRARY */

/*
 * wins_wch.c
 *
 * XCurses Library
 *
 * Copyright 1990, 1995 by Mortice Kern Systems Inc.  All rights reserved.
 *
 */

#ifdef M_RCSID
#ifndef lint
static char rcsID[] =
"$Header: /team/ps/sun_xcurses/archive/local_changes/xcurses/src/lib/"
"libxcurses/src/libc/xcurses/rcs/wins_wch.c 1.3 1998/06/04 17:54:38 "
"cbates Exp $";
#endif
#endif

#include <private.h>
#include <string.h>

/*
 * Insert a character into a window line, shifting the line right
 * the column width of the inserted character.  The right most columns
 * will be truncated according to the width of the character inserted.
 */
int
__m_cc_ins(WINDOW *w, int y, int x, const cchar_t *cc)
{
    int width;

    /* Determine the character width to insert. */
    if ((width = __m_cc_width(cc)) <= 0 || w->_maxx < x + width)
        return (-1);

    x = __m_cc_first(w, y, x);

    /*
     * Use erase to remove possible multi-column chars
     * before memmove clobbers them
     */
    (void) __m_cc_erase(w, y, w->_maxx - width, y, w->_maxx - 1);

    /* Insert a "hole" into the line. */
    (void) memmove(&w->_line[y][x + width], &w->_line[y][x],
        (w->_maxx - x - width) * sizeof (**w->_line));

    /* Write the character into the hole. */
    if (__m_cc_replace(w, y, x, cc, 0) != width)
        return (-1);

    /* Update dirty region markers. */
    if (x < w->_first[y])
        w->_first[y] = (short) x;
    w->_last[y] = w->_maxx;

    /*
     * If the last character on the line is incomplete,
     * blank it out.
     */
    x = __m_cc_first(w, y, w->_maxx-1);
    if (w->_maxx < x + __m_cc_width(&w->_line[y][x]))
        (void) __m_cc_erase(w, y, x, y, w->_maxx-1);

    return (width);
}

/*
 * Special internal version of wins_wch() that can track the cursor
 * position to facilitate inserting strings containing special characters
 * like \b, \n, \r, and \t.
 */
int
__m_wins_wch(WINDOW *w, int y, int x, const cchar_t *cc,
    int *yp, int *xp)
{
    cchar_t uc;
    const wchar_t   *p;
    int code, nx, width;

    code = ERR;

    switch (cc->_wc[0]) {
    case L'\r':
        x = 0;
        break;
    case L'\b':
        if (0 < x)
            --x;
        break;
    case L'\t':
        for (nx = x + (8 - (x & 07)); x < nx; x += width)
            if ((width = __m_cc_ins(w, y, x, &w->_bg)) <= 0)
                goto error;
        break;
    case L'\n':
        /* Truncate the tail of the current line. */
        if (__m_cc_erase(w, y, x, y, w->_maxx - 1) == -1)
            goto error;

        if (__m_do_scroll(w, y, x, &y, &x) == ERR)
            goto error;
        break;
    default:
        if (iswprint(cc->_wc[0])) {
            if ((width = __m_cc_ins(w, y, x, cc)) <= 0)
                goto error;
            x += width;
            break;
        }

        /* Convert non-printables into printable representation. */
        uc._n = 1;
        uc._at = cc->_at;
        uc._co = cc->_co;

        if ((p = wunctrl((cchar_t *)cc)) == NULL)
            goto error;

        for (; *p != '\0'; ++p, x += width) {
            uc._wc[0] = *p;
            if ((width = __m_cc_ins(w, y, x, &uc)) < 0)
                goto error;
        }
    }

    if (yp != NULL)
        *yp = y;
    if (xp != NULL)
        *xp = x;

    WSYNC(w);

    code = WFLUSH(w);
error:
    return (code);
}

/*
 * Insert a character (with attributes) before the cursor. All
 * characters to the right of the cursor are moved one space to
 * the right, with a possibility of the rightmost character on
 * the line being lost.  The cursor position does not change.
 */
int
wins_wch(WINDOW *w, const cchar_t *cc)
{
    int code;

    code = __m_wins_wch(w, w->_cury, w->_curx, cc, NULL, NULL);

    return (code);
}