/*
 * 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, by Sun Microsystems, Inc.
 * All rights reserved.
 */

/*
 * 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: /rd/src/libc/xcurses/rcs/wins_wch.c 1.9 1995/09/28 13:18:36 ant Exp $";
#endif
#endif

#include <private.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(w, y, x, cc)
WINDOW *w;
int y, x;
const cchar_t *cc;
{
        extern void *memmove();         /* quiet sparcv9 warning */
        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);

        /* 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] = 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(w, y, x, cc, yp, xp)
WINDOW *w;
int y, x;
const cchar_t *cc;
int *yp, *xp;
{
        cchar_t uc;
        const wchar_t *p;
        int code, nx, width;

#ifdef M_CURSES_TRACE
        __m_trace("__m_wins_wch(%p, %d, %d, %p, %p, %p)", w, y, x, cc, yp, xp);
#endif

        code = ERR;

        switch (cc->_wc[0]) {
        case '\r':
                x = 0;
                break;
        case '\b':
                if (0 < x)
                        --x;
                break;
        case '\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 '\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(cc)) == (wchar_t *) 0)
                        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 != (int *) 0)
                *yp = y;
        if (xp != (int *) 0)
                *xp = x;

        WSYNC(w);

        code = WFLUSH(w);
error:
        return __m_return_code("wins_wch", code);
}

/*f
 * 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(w, cc)
WINDOW *w;
const cchar_t *cc;
{
        int code;

#ifdef M_CURSES_TRACE
        __m_trace("wins_wch(%p, %p) at (%d, %d)", w, cc, w->_cury, w->_curx);
#endif

        code = __m_wins_wch(w, w->_cury, w->_curx, cc, (int *) 0, (int *) 0);

        return __m_return_code("wins_wch", code);
}