xref: /src/lib/libcurses/addbytes.c

/*	$NetBSD: addbytes.c,v 1.28 2003/08/07 16:44:18 agc Exp $	*/

/*
 * Copyright (c) 1987, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)addbytes.c	8.4 (Berkeley) 5/4/94";
#else
__RCSID("$NetBSD: addbytes.c,v 1.28 2003/08/07 16:44:18 agc Exp $");
#endif
#endif				/* not lint */

#include "curses.h"
#include "curses_private.h"
#ifdef DEBUG
#include <assert.h>
#endif

#define	SYNCH_IN	{y = win->cury; x = win->curx;}
#define	SYNCH_OUT	{win->cury = y; win->curx = x;}

#ifndef _CURSES_USE_MACROS

/*
 * addbytes --
 *      Add the character to the current position in stdscr.
 */
int
addbytes(const char *bytes, int count)
{
	return __waddbytes(stdscr, bytes, count, 0);
}

/*
 * waddbytes --
 *      Add the character to the current position in the given window.
 */
int
waddbytes(WINDOW *win, const char *bytes, int count)
{
	return __waddbytes(win, bytes, count, 0);
}

/*
 * mvaddbytes --
 *      Add the characters to stdscr at the location given.
 */
int
mvaddbytes(int y, int x, const char *bytes, int count)
{
	return mvwaddbytes(stdscr, y, x, bytes, count);
}

/*
 * mvwaddbytes --
 *      Add the characters to the given window at the location given.
 */
int
mvwaddbytes(WINDOW *win, int y, int x, const char *bytes, int count)
{
	if (wmove(win, y, x) == ERR)
		return ERR;

	return __waddbytes(win, bytes, count, 0);
}

#endif

/*
 * waddbytes --
 *	Add the character to the current position in the given window.
 */
int
__waddbytes(WINDOW *win, const char *bytes, int count, attr_t attr)
{
	static char	 blanks[] = "        ";
	int		 c, newx, x, y;
	attr_t		 attributes;
	__LINE		*lp;
#ifdef DEBUG
	int             i;

	for (i = 0; i < win->maxy; i++) {
		assert(win->lines[i]->sentinel == SENTINEL_VALUE);
	}
#endif

	SYNCH_IN;
	lp = win->lines[y];

	while (count--) {
		c = *bytes++;
#ifdef DEBUG
		__CTRACE("ADDBYTES('%c', %x) at (%d, %d)\n", c, attr, y, x);
#endif
		switch (c) {
		case '\t':
			SYNCH_OUT;
			if (waddbytes(win, blanks, 8 - (x % 8)) == ERR)
				return (ERR);
			SYNCH_IN;
			break;

		default:
#ifdef DEBUG
			__CTRACE("ADDBYTES(%p, %d, %d)\n", win, y, x);
#endif

			if (lp->flags & __ISPASTEOL) {
				x = 0;
		newline:
				lp->flags &= ~(__ISPASTEOL | __ISAFTERCR);
				if (y == win->scr_b) {
#ifdef DEBUG
					__CTRACE("ADDBYTES - on bottom "
					    "of scrolling region\n");
#endif
					if (!(win->flags & __SCROLLOK))
						return ERR;
					SYNCH_OUT;
					scroll(win);
					SYNCH_IN;
				} else {
					y++;
				}
				lp = win->lines[y];
				if (c == '\n')
					break;
			}

			attributes = (win->wattr | attr) &
			    (__ATTRIBUTES & ~__COLOR);
			if (attr & __COLOR)
				attributes |= attr & __COLOR;
			else if (win->wattr & __COLOR)
				attributes |= win->wattr & __COLOR;
#ifdef DEBUG
			__CTRACE("ADDBYTES: 1: y = %d, x = %d, firstch = %d, "
				"lastch = %d\n",
			    y, x, *win->lines[y]->firstchp,
			    *win->lines[y]->lastchp);
#endif
			/*
			 * Always update the change pointers.  Otherwise,
			 * we could end up not displaying 'blank' characters
			 * when overlapping windows are displayed.
			 */
			newx = x + win->ch_off;
			lp->flags |= __ISDIRTY;
			/*
			 * firstchp/lastchp are shared between
			 * parent window and sub-window.
			 */
			if (newx < *lp->firstchp)
				*lp->firstchp = newx;
			if (newx > *lp->lastchp)
				*lp->lastchp = newx;
#ifdef DEBUG
			__CTRACE("ADDBYTES: change gives f/l: %d/%d [%d/%d]\n",
			    *lp->firstchp, *lp->lastchp,
			    *lp->firstchp - win->ch_off,
			    *lp->lastchp - win->ch_off);
#endif
			lp->line[x].ch = c;
			lp->line[x].bch = win->bch;
			lp->line[x].attr = attributes;
			lp->line[x].battr = win->battr;
			if (x == win->maxx - 1)
				lp->flags |= __ISPASTEOL;
			else
				x++;
#ifdef DEBUG
			__CTRACE("ADDBYTES: 2: y = %d, x = %d, firstch = %d, lastch = %d\n",
			    y, x, *win->lines[y]->firstchp,
			    *win->lines[y]->lastchp);
#endif
			break;
		case '\n':
			if (!(lp->flags & (__ISPASTEOL | __ISAFTERCR))) {
				SYNCH_OUT;
				wclrtoeol(win);
				SYNCH_IN;
			}
			if (!__NONL)
				x = 0;
			goto newline;
		case '\r':
			if (!(lp->flags & __ISAFTERCR)) {
				SYNCH_OUT;
				wclrtoeol(win);
				SYNCH_IN;
			}
			x = 0;
			lp->flags |= __ISAFTERCR;
			continue;
		case '\b':
			if (--x < 0)
				x = 0;
			break;
		}
		lp->flags &= ~__ISAFTERCR;
	}
	SYNCH_OUT;

#ifdef DEBUG
	for (i = 0; i < win->maxy; i++) {
		assert(win->lines[i]->sentinel == SENTINEL_VALUE);
	}
#endif

	return (OK);
}