/*
 * 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.
 */

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

/*
 * 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);
}