ciolib.c 28.6 KB
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/* $Id$ */

/****************************************************************************
 * @format.tab-size 4		(Plain Text/Source Code File Header)			*
 * @format.use-tabs true	(see http://www.synchro.net/ptsc_hdr.html)		*
 *																			*
 * Copyright 2004 Rob Swindell - http://www.synchro.net/copyright.html		*
 *																			*
 * This library is free software; you can redistribute it and/or			*
 * modify it under the terms of the GNU Lesser General Public License		*
 * as published by the Free Software Foundation; either version 2			*
 * of the License, or (at your option) any later version.					*
 * See the GNU Lesser General Public License for more details: lgpl.txt or	*
 * http://www.fsf.org/copyleft/lesser.html									*
 *																			*
 * Anonymous FTP access to the most recent released source is available at	*
 * ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net	*
 *																			*
 * Anonymous CVS access to the development source and modification history	*
 * is available at cvs.synchro.net:/cvsroot/sbbs, example:					*
 * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs login			*
 *     (just hit return, no password is necessary)							*
 * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs checkout src		*
 *																			*
 * For Synchronet coding style and modification guidelines, see				*
 * http://www.synchro.net/source.html										*
 *																			*
 * You are encouraged to submit any modifications (preferably in Unix diff	*
 * format) via e-mail to mods@synchro.net									*
 *																			*
 * Note: If this box doesn't appear square, then you need to fix your tabs.	*
 ****************************************************************************/

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/* Icon file! */
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#ifdef __BORLANDC__
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#pragma resource "ciolib.res"
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#endif
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#include <stdarg.h>
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#include <stdlib.h>	/* alloca */
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#include <stdio.h>
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#if defined(_WIN32)
 #include <malloc.h>	/* alloca() on Win32 */
#endif
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#include <threadwrap.h>
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#include <genwrap.h>
#include <xpbeep.h>
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#define CIOLIB_NO_MACROS
#include "ciolib.h"

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#if defined(WITH_SDL) || defined(WITH_SDL_AUDIO)
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 #include "sdl_con.h"
#endif
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#ifdef _WIN32
 #include "win32cio.h"
#else
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 #ifndef NO_X
  #include "x_cio.h"
 #endif
 #include "curs_cio.h"
 #undef getch
#endif

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#include "bitmap_con.h"
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#include "ansi_cio.h"

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CIOLIBEXPORT cioapi_t	cio_api;
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static const int tabs[10]={9,17,25,33,41,49,57,65,73,80};
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static int ungotch;
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struct text_info cio_textinfo;
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static int lastmode=3;
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CIOLIBEXPORT int _wscroll=1;
CIOLIBEXPORT int directvideo=0;
CIOLIBEXPORT int hold_update=0;
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CIOLIBEXPORT int puttext_can_move=0;
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static int initialized=0;

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CIOLIBEXPORT int CIOLIBCALL ciolib_movetext(int sx, int sy, int ex, int ey, int dx, int dy);
CIOLIBEXPORT char * CIOLIBCALL ciolib_cgets(char *str);
CIOLIBEXPORT int CIOLIBCALL ciolib_cscanf (char *format , ...);
CIOLIBEXPORT int CIOLIBCALL ciolib_kbhit(void);
CIOLIBEXPORT int CIOLIBCALL ciolib_getch(void);
CIOLIBEXPORT int CIOLIBCALL ciolib_getche(void);
CIOLIBEXPORT int CIOLIBCALL ciolib_ungetch(int ch);
CIOLIBEXPORT void CIOLIBCALL ciolib_gettextinfo(struct text_info *info);
CIOLIBEXPORT int CIOLIBCALL ciolib_wherex(void);
CIOLIBEXPORT int CIOLIBCALL ciolib_wherey(void);
CIOLIBEXPORT void CIOLIBCALL ciolib_wscroll(void);
CIOLIBEXPORT void CIOLIBCALL ciolib_gotoxy(int x, int y);
CIOLIBEXPORT void CIOLIBCALL ciolib_clreol(void);
CIOLIBEXPORT void CIOLIBCALL ciolib_clrscr(void);
CIOLIBEXPORT int CIOLIBCALL ciolib_cputs(char *str);
CIOLIBEXPORT int	CIOLIBCALL ciolib_cprintf(char *fmat, ...);
CIOLIBEXPORT void CIOLIBCALL ciolib_textbackground(int colour);
CIOLIBEXPORT void CIOLIBCALL ciolib_textcolor(int colour);
CIOLIBEXPORT void CIOLIBCALL ciolib_highvideo(void);
CIOLIBEXPORT void CIOLIBCALL ciolib_lowvideo(void);
CIOLIBEXPORT void CIOLIBCALL ciolib_normvideo(void);
CIOLIBEXPORT int CIOLIBCALL ciolib_puttext(int a,int b,int c,int d,unsigned char *e);
CIOLIBEXPORT int CIOLIBCALL ciolib_gettext(int a,int b,int c,int d,unsigned char *e);
CIOLIBEXPORT void CIOLIBCALL ciolib_textattr(int a);
CIOLIBEXPORT void CIOLIBCALL ciolib_delay(long a);
CIOLIBEXPORT int CIOLIBCALL ciolib_putch(int a);
CIOLIBEXPORT void CIOLIBCALL ciolib_setcursortype(int a);
CIOLIBEXPORT void CIOLIBCALL ciolib_textmode(int mode);
CIOLIBEXPORT void CIOLIBCALL ciolib_window(int sx, int sy, int ex, int ey);
CIOLIBEXPORT void CIOLIBCALL ciolib_delline(void);
CIOLIBEXPORT void CIOLIBCALL ciolib_insline(void);
CIOLIBEXPORT char * CIOLIBCALL ciolib_getpass(const char *prompt);
CIOLIBEXPORT void CIOLIBCALL ciolib_copytext(const char *text, size_t buflen);
CIOLIBEXPORT char * CIOLIBCALL ciolib_getcliptext(void);
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CIOLIBEXPORT int CIOLIBCALL ciolib_get_window_info(int *width, int *height, int *xpos, int *ypos);
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#define CIOLIB_INIT()		{ if(initialized != 1) initciolib(CIOLIB_MODE_AUTO); }
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#if defined(WITH_SDL) || defined(WITH_SDL_AUDIO)
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int try_sdl_init(int mode)
{
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	if(!sdl_initciolib(mode)) {
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		cio_api.mouse=1;
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		cio_api.puttext=bitmap_puttext;
		cio_api.gettext=bitmap_gettext;
		cio_api.gotoxy=bitmap_gotoxy;
		cio_api.setcursortype=bitmap_setcursortype;
		cio_api.setfont=bitmap_setfont;
		cio_api.getfont=bitmap_getfont;
		cio_api.loadfont=bitmap_loadfont;
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		cio_api.movetext=bitmap_movetext;
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		cio_api.clreol=bitmap_clreol;
		cio_api.clrscr=bitmap_clrscr;
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		cio_api.kbhit=sdl_kbhit;
		cio_api.getch=sdl_getch;
		cio_api.textmode=sdl_textmode;
		cio_api.showmouse=sdl_showmouse;
		cio_api.hidemouse=sdl_hidemouse;
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		cio_api.setname=sdl_setname;
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		cio_api.seticon=sdl_seticon;
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		cio_api.settitle=sdl_settitle;
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#ifdef _WIN32
		cio_api.copytext=win32_copytext;
		cio_api.getcliptext=win32_getcliptext;
#else
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		cio_api.copytext=sdl_copytext;
		cio_api.getcliptext=sdl_getcliptext;
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#endif
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		cio_api.get_window_info=sdl_get_window_info;
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		return(1);
	}
	return(0);
}
#endif

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#ifndef _WIN32
 #ifndef NO_X
int try_x_init(int mode)
{
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	if(!x_init()) {
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		cio_api.mode=CIOLIB_MODE_X;
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		cio_api.mouse=1;
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		cio_api.puttext=bitmap_puttext;
		cio_api.gettext=bitmap_gettext;
		cio_api.gotoxy=bitmap_gotoxy;
		cio_api.setcursortype=bitmap_setcursortype;
		cio_api.setfont=bitmap_setfont;
		cio_api.getfont=bitmap_getfont;
		cio_api.loadfont=bitmap_loadfont;
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		cio_api.beep=x_beep;
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		cio_api.movetext=bitmap_movetext;
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		cio_api.clreol=bitmap_clreol;
		cio_api.clrscr=bitmap_clrscr;
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		cio_api.kbhit=x_kbhit;
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		cio_api.getch=x_getch;
		cio_api.textmode=x_textmode;
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		cio_api.setname=x_setname;
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		cio_api.settitle=x_settitle;
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		cio_api.copytext=x_copytext;
		cio_api.getcliptext=x_getcliptext;
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		cio_api.get_window_info=x_get_window_info;
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		return(1);
	}
	return(0);
}
 #endif

int try_curses_init(int mode)
{
	if(curs_initciolib(mode)) {
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		if(mode==CIOLIB_MODE_AUTO)
			mode=CIOLIB_MODE_CURSES;
		cio_api.mode=mode;
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		cio_api.puttext=curs_puttext;
		cio_api.gettext=curs_gettext;
		cio_api.textattr=curs_textattr;
		cio_api.kbhit=curs_kbhit;
		cio_api.gotoxy=curs_gotoxy;
		cio_api.setcursortype=curs_setcursortype;
		cio_api.getch=curs_getch;
		cio_api.textmode=curs_textmode;
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		cio_api.showmouse=curs_showmouse;
		cio_api.hidemouse=curs_hidemouse;
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		cio_api.suspend=curs_suspend;
		cio_api.resume=curs_resume;
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		cio_api.beep=curs_beep;
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#if defined(NCURSES_VERSION_MAJOR) || defined (__NetBSD__)
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		cio_api.ESCDELAY=&ESCDELAY;
#endif
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		return(1);
	}
	return(0);
}
#endif

int try_ansi_init(int mode)
{
	if(ansi_initciolib(mode)) {
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		cio_api.mode=CIOLIB_MODE_ANSI;
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		cio_api.mouse=0;
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		cio_api.puttext=ansi_puttext;
		cio_api.gettext=ansi_gettext;
		cio_api.textattr=ansi_textattr;
		cio_api.kbhit=ansi_kbhit;
		cio_api.gotoxy=ansi_gotoxy;
		cio_api.setcursortype=ansi_setcursortype;
		cio_api.getch=ansi_getch;
		cio_api.textmode=ansi_textmode;
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		cio_api.ESCDELAY=&CIOLIB_ANSI_TIMEOUT;
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		cio_api.beep=ansi_beep;
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		return(1);
	}
	return(0);
}

#ifdef _WIN32
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#if defined(__BORLANDC__)
        #pragma argsused
#endif
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int try_conio_init(int mode)
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{
	/* This should test for something or other */
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	if(win32_initciolib(mode)) {
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		if(mode==CIOLIB_MODE_AUTO)
			cio_api.mode=CIOLIB_MODE_CONIO;
		else
			cio_api.mode=mode;	/* CIOLIB_MODE_CONIO or CIOLIB_MODE_CONIO_FULLSCREEN */
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		cio_api.mouse=1;
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		cio_api.puttext=win32_puttext;
		cio_api.gettext=win32_gettext;
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		cio_api.kbhit=win32_kbhit;
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		cio_api.gotoxy=win32_gotoxy;
		cio_api.setcursortype=win32_setcursortype;
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		cio_api.getch=win32_getch;
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		cio_api.textmode=win32_textmode;
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		cio_api.showmouse=win32_showmouse;
		cio_api.hidemouse=win32_hidemouse;
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		cio_api.setname=win32_settitle;
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		cio_api.settitle=win32_settitle;
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		cio_api.copytext=win32_copytext;
		cio_api.getcliptext=win32_getcliptext;
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		cio_api.suspend=win32_suspend;
		cio_api.resume=win32_resume;
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		return(1);
	}
	return(0);
}
#endif

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/* Optional */
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CIOLIBEXPORT void CIOLIBCALL suspendciolib(void)
{
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	ciolib_clrscr();
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	if(cio_api.suspend != NULL)
		cio_api.suspend();
	initialized=-1;
}

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CIOLIBEXPORT int CIOLIBCALL initciolib(int mode)
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{
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	switch(initialized) {
		case 1:
			return(0);
		case -1:
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			initialized=1;
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			if(cio_api.resume != NULL)
				cio_api.resume();
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			ciolib_clrscr();
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			return(0);
	}

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	memset(&cio_api,0,sizeof(cio_api));

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	switch(mode) {
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		case CIOLIB_MODE_AUTO:
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#if defined(WITH_SDL) || defined(WITH_SDL_AUDIO)
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			if(!try_sdl_init(CIOLIB_MODE_SDL))
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#endif
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#ifdef _WIN32
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				if(!try_conio_init(mode))
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#else
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#ifndef NO_X
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				if(!try_x_init(mode))
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#endif
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					if(!try_curses_init(mode))
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#endif
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						try_ansi_init(mode);
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			break;
#ifdef _WIN32
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		case CIOLIB_MODE_CONIO:
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		case CIOLIB_MODE_CONIO_FULLSCREEN:
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			try_conio_init(mode);
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			break;
#else
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		case CIOLIB_MODE_CURSES:
		case CIOLIB_MODE_CURSES_IBM:
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			try_curses_init(mode);
			break;
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		case CIOLIB_MODE_X:
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#ifndef NO_X
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			try_x_init(mode);
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#endif
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			break;
#endif
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		case CIOLIB_MODE_ANSI:
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			try_ansi_init(mode);
			break;
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#if defined(WITH_SDL) || defined(WITH_SDL_AUDIO)
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		case CIOLIB_MODE_SDL:
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		case CIOLIB_MODE_SDL_FULLSCREEN:
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		case CIOLIB_MODE_SDL_YUV:
		case CIOLIB_MODE_SDL_YUV_FULLSCREEN:
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			try_sdl_init(mode);
			break;
#endif
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	}
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	if(cio_api.mode==CIOLIB_MODE_AUTO) {
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		fprintf(stderr,"CIOLIB initialization failed!\n");
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		return(-1);
	}

	initialized=1;
	cio_textinfo.winleft=1;
	cio_textinfo.wintop=1;
	cio_textinfo.winright=cio_textinfo.screenwidth;
	cio_textinfo.winbottom=cio_textinfo.screenheight;
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	/* Default C64 is Lt Blue on Black (As per CGTerm) */
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	switch(cio_textinfo.currmode) {
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		case C64_40X25:
		case C128_40X25:
		case C128_80X25:
			cio_textinfo.normattr=14;
			break;
		default:
			cio_textinfo.normattr=7;
	}
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	_beginthread(ciolib_mouse_thread,0,NULL);
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	return(0);
}

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/* **MUST** be implemented */
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CIOLIBEXPORT int CIOLIBCALL ciolib_kbhit(void)
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{
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	CIOLIB_INIT();
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	if(ungotch)
		return(1);
	return(cio_api.kbhit());
}

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/* **MUST** be implemented */
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CIOLIBEXPORT int CIOLIBCALL ciolib_getch(void)
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{
	int ch;

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	CIOLIB_INIT();

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	if(ungotch) {
		ch=ungotch;
		ungotch=0;
		return(ch);
	}
	return(cio_api.getch());
}

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/* Optional */
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CIOLIBEXPORT int CIOLIBCALL ciolib_getche(void)
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{
	int ch;

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	CIOLIB_INIT();

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	if(ungotch) {
		ch=ungotch;
		ungotch=0;
		ciolib_putch(ch);
		return(ch);
	}
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	if(cio_api.getche())
		return(cio_api.getche());
	else {
		while(1) {
			ch=ciolib_getch();
			if(ch) {
				ciolib_putch(ch);
				return(ch);
			}
			/* Eat extended chars */
			ciolib_getch();
		}
	}
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}

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/* Optional */
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CIOLIBEXPORT int CIOLIBCALL ciolib_ungetch(int ch)
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{
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	CIOLIB_INIT();
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	if(ungotch)
		return(EOF);
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	if(cio_api.ungetch)
		return(cio_api.ungetch(ch));
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	ungotch=ch;
	return(ch);
}

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/* Optional */
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CIOLIBEXPORT int CIOLIBCALL ciolib_movetext(int sx, int sy, int ex, int ey, int dx, int dy)
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{
	int width;
	int height;
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	unsigned char *buf;
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	CIOLIB_INIT();
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	if(cio_api.movetext != NULL)
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		return(cio_api.movetext(sx, sy, ex, ey, dx, dy));
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	width=ex-sx;
	height=ey-sy;
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	buf=(unsigned char *)alloca((width+1)*(height+1)*2);
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	if(buf==NULL)
		return(0);
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	if(!ciolib_gettext(sx,sy,ex,ey,buf))
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		return(0);
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	if(!ciolib_puttext(dx,dy,dx+width,dy+height,buf))
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		return(0);
	return(1);
}

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/* Optional */
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CIOLIBEXPORT char * CIOLIBCALL ciolib_cgets(char *str)
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{
	int	maxlen;
	int len=0;
	int ch;

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	CIOLIB_INIT();
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	if(cio_api.cgets)
		return(cio_api.cgets(str));

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	maxlen=*(unsigned char *)str;
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	while((ch=ciolib_getch())!='\n' && ch !='\r') {
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		switch(ch) {
			case 0:	/* Skip extended keys */
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				ciolib_getche();
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				break;
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			case '\r':	/* Skip \r (ToDo: Should this be treated as a \n? */
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				break;
			case '\b':
				if(len==0) {
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					ciolib_putch(7);
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					break;
				}
				ciolib_putch('\b');
				len--;
				break;
			default:
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				ciolib_putch(ch);
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				str[(len++)+2]=ch;
				if(len==maxlen) {
					str[len+2]=0;
					*((unsigned char *)(str+1))=(unsigned char)len;
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					ciolib_putch('\r');
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					ciolib_putch('\n');
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					return(&str[2]);
				}
				break;
		}
	}
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	str[len+2]=0;
	*((unsigned char *)(str+1))=(unsigned char)len;
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	ciolib_putch('\r');
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	ciolib_putch('\n');
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	return(&str[2]);
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}

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#ifdef _MSC_VER	/* Use lame vsscanf() implementation */
/* This is a way to do _vsscanf without using fancy stack tricks or using the
 * "_input" method provided by Microsoft, which is no longer exported as of .NET.
 * The function has a limit of 25 arguments (or less if you run out of stack space),
 *  but how many arguments do you need?
 */
/* From "krabsheva" - http://www.codeguru.com/Cpp/Cpp/string/comments.php/c5631/?thread=1051 */
int vsscanf( const char *buffer, const char *format, va_list arg_ptr )
{
	int i, ret;
	void *arg_arr[25];

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	/* Do exception handling in case we go too far // */
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	__try
	{
		for ( i = 0; i < 25; i++ )
			arg_arr[i] = va_arg( arg_ptr, void * );
	}
	__except( EXCEPTION_EXECUTE_HANDLER )
	{
	}

	/* This is lame, but the extra arguments won't be used by sscanf */
	ret = sscanf( buffer, format, arg_arr[0], arg_arr[1], arg_arr[2], arg_arr[3],
		arg_arr[4], arg_arr[5], arg_arr[6], arg_arr[7], arg_arr[8], arg_arr[9],
		arg_arr[10], arg_arr[11], arg_arr[12], arg_arr[13], arg_arr[14],
		arg_arr[15], arg_arr[16], arg_arr[17], arg_arr[18], arg_arr[19],
		arg_arr[20], arg_arr[21], arg_arr[22], arg_arr[23], arg_arr[24] );

	return ret;
}
#endif

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/* Optional... in fact, since it's varargs, you can't override it */
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CIOLIBEXPORT int CIOLIBCALL ciolib_cscanf (char *format , ...)
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{
	char str[255];
    va_list argptr;
	int ret;

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	CIOLIB_INIT();
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	str[0]=-1;
	va_start(argptr,format);
	ret=vsscanf(ciolib_cgets(str),format,argptr);
	va_end(argptr);
	return(ret);
}

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/* Optional */
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CIOLIBEXPORT char * CIOLIBCALL ciolib_getpass(const char *prompt)
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{
	static char pass[9];
	int len=0;
	int ch;

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	CIOLIB_INIT();
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	if(cio_api.getpass)
		return(cio_api.getpass(prompt));

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	ciolib_cputs((char *)prompt);
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	while((ch=ciolib_getch())!='\n') {
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		switch(ch) {
			case 0:	/* Skip extended keys */
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				ciolib_getch();
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				break;
			case '\r':	/* Skip \r (ToDo: Should this be treeated as a \n? */
				break;
			case '\b':
				if(len==0) {
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					ciolib_putch(7);
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					break;
				}
				len--;
				break;
			default:
				if(len==8)
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					ciolib_putch(7);
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				else
					pass[len++]=ch;
				break;
		}
	}
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	pass[len]=0;
	return(pass);
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}

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/* TODO: Hackery here... must fix */
/* Optional */
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CIOLIBEXPORT void CIOLIBCALL ciolib_gettextinfo(struct text_info *info)
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{
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	CIOLIB_INIT()

	if(cio_api.gettextinfo) {
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		cio_api.gettextinfo(&cio_textinfo);
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		return;
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	}
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	if(info!=&cio_textinfo) {
		info->winleft=cio_textinfo.winleft;        /* left window coordinate */
		info->wintop=cio_textinfo.wintop;         /* top window coordinate */
		info->winright=cio_textinfo.winright;       /* right window coordinate */
		info->winbottom=cio_textinfo.winbottom;      /* bottom window coordinate */
		info->attribute=cio_textinfo.attribute;      /* text attribute */
		info->normattr=cio_textinfo.normattr;       /* normal attribute */
		info->currmode=cio_textinfo.currmode;       /* current video mode:
                               			 BW40, BW80, C40, C80, or C4350 */
		info->screenheight=cio_textinfo.screenheight;   /* text screen's height */
		info->screenwidth=cio_textinfo.screenwidth;    /* text screen's width */
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		info->curx=cio_textinfo.curx;           /* x-coordinate in current window */
		info->cury=cio_textinfo.cury;           /* y-coordinate in current window */
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	}
}

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/* Optional */
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CIOLIBEXPORT void CIOLIBCALL ciolib_wscroll(void)
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{
	int os;

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	CIOLIB_INIT();
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	if(cio_api.wscroll!=NULL) {
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		cio_api.wscroll();
		return;
	}
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	if(!_wscroll)
		return;
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	ciolib_movetext(cio_textinfo.winleft
			,cio_textinfo.wintop+1
			,cio_textinfo.winright
			,cio_textinfo.winbottom
			,cio_textinfo.winleft
			,cio_textinfo.wintop);
	ciolib_gotoxy(1,cio_textinfo.winbottom-cio_textinfo.wintop+1);
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	os=_wscroll;
	_wscroll=0;
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	/* ciolib_cprintf("%*s",ti.winright-ti.winleft+1,""); */
	ciolib_clreol();
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	_wscroll=os;
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	ciolib_gotoxy(cio_textinfo.curx,cio_textinfo.cury);
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}

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/* Optional */
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CIOLIBEXPORT int CIOLIBCALL ciolib_wherex(void)
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{
	int x;

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	CIOLIB_INIT();
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	if(cio_api.wherex) {
		/* TODO: This is old hackery... beware */
		x=cio_api.wherex();
		x=x-cio_textinfo.winleft+1;
	}
	else
		x=cio_textinfo.curx;
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	return(x);
}

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/* Optional */
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CIOLIBEXPORT int CIOLIBCALL ciolib_wherey(void)
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{
	int y;

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	CIOLIB_INIT();
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	if(cio_api.wherey) {
		/* TODO: This is old hackery... beware */
		y=cio_api.wherey();
		y=y-cio_textinfo.wintop+1;
	}
	else
		y=cio_textinfo.cury;
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	return(y);
}

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/* **MUST** be implemented */
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CIOLIBEXPORT void CIOLIBCALL ciolib_gotoxy(int x, int y)
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{
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	CIOLIB_INIT();
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	if(		x < 1
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			|| x > cio_textinfo.winright-cio_textinfo.winleft+1
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			|| y < 1
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			|| y > cio_textinfo.winbottom-cio_textinfo.wintop+1)
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		return;
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	cio_api.gotoxy(x,y);
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}

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CIOLIBEXPORT void CIOLIBCALL ciolib_textmode(int mode)
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{
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	CIOLIB_INIT();
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	if(mode==-1) {
		cio_api.textmode(lastmode);
		lastmode=cio_textinfo.currmode;
	}
	else {
		lastmode=cio_textinfo.currmode;
		cio_api.textmode(mode);
	}
	cio_textinfo.winleft=1;
	cio_textinfo.wintop=1;
	cio_textinfo.winright=cio_textinfo.screenwidth;
	cio_textinfo.winbottom=cio_textinfo.screenheight;
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	switch(cio_textinfo.currmode) {
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		case C64_40X25:
		case C128_40X25:
		case C128_80X25:
			cio_textinfo.normattr=14;
			break;
		default:
			cio_textinfo.normattr=7;
	}
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}

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CIOLIBEXPORT void CIOLIBCALL ciolib_window(int sx, int sy, int ex, int ey)
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{
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	CIOLIB_INIT();
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	if(cio_api.window)
		cio_api.window(sx,sy,ex,ey);

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	if(		   sx < 1
			|| sy < 1
			|| ex < 1
			|| ey < 1
			|| sx > cio_textinfo.screenwidth
			|| sy > cio_textinfo.screenheight
			|| sx > ex
			|| sy > ey
			|| ex > cio_textinfo.screenwidth
			|| ey > cio_textinfo.screenheight)
		return;
	cio_textinfo.winleft=sx;
	cio_textinfo.wintop=sy;
	cio_textinfo.winright=ex;
	cio_textinfo.winbottom=ey;
	ciolib_gotoxy(1,1);
}

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CIOLIBEXPORT void CIOLIBCALL ciolib_clreol(void)
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{
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	unsigned char *buf;
	int i;
	int width,height;
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	CIOLIB_INIT();
	
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	if(cio_api.clreol) {
		cio_api.clreol();
		return;
	}
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	width=cio_textinfo.winright-cio_textinfo.winleft+1-cio_textinfo.curx+1;
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	height=1;
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	buf=(unsigned char *)alloca(width*height*2);
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	for(i=0;i<width*height*2;) {
		buf[i++]=' ';
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		buf[i++]=cio_textinfo.attribute;
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	}
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	ciolib_puttext(
			cio_textinfo.curx+cio_textinfo.winleft-1,
			cio_textinfo.cury+cio_textinfo.wintop-1,
			cio_textinfo.winright,
			cio_textinfo.cury+cio_textinfo.wintop-1,
			buf);
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}

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/* Optional */
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CIOLIBEXPORT void CIOLIBCALL ciolib_clrscr(void)
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{
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	unsigned char *buf;
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	int i;
	int width,height;
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	int old_ptcm=puttext_can_move;
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	CIOLIB_INIT();
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	if(cio_api.clrscr) {
		cio_api.clrscr();
		return;
	}
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	width=cio_textinfo.winright-cio_textinfo.winleft+1;
	height=cio_textinfo.winbottom-cio_textinfo.wintop+1;
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	buf=(unsigned char *)alloca(width*height*2);
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	for(i=0;i<width*height*2;) {
		buf[i++]=' ';
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		buf[i++]=cio_textinfo.attribute;
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	}
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	puttext_can_move=1;
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	ciolib_puttext(cio_textinfo.winleft,cio_textinfo.wintop,cio_textinfo.winright,cio_textinfo.winbottom,buf);
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	ciolib_gotoxy(1,1);
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	puttext_can_move=old_ptcm;
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}

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/* Optional */
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CIOLIBEXPORT void CIOLIBCALL ciolib_delline(void)
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{
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	CIOLIB_INIT();
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	if(cio_api.delline) {
		cio_api.delline();
		return;
	}
	ciolib_movetext(cio_textinfo.winleft
			,cio_textinfo.cury+1
			,cio_textinfo.winright
			,cio_textinfo.winbottom
			,cio_textinfo.winleft
			,cio_textinfo.cury);
	ciolib_gotoxy(1,cio_textinfo.winbottom-cio_textinfo.wintop+1);
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	ciolib_gotoxy(cio_textinfo.curx,cio_textinfo.cury);
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}

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CIOLIBEXPORT void CIOLIBCALL ciolib_insline(void)
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{
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	CIOLIB_INIT();
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	if(cio_api.insline) {
		cio_api.insline();
		return;
	}
	ciolib_movetext(cio_textinfo.winleft,cio_textinfo.cury,cio_textinfo.winright,cio_textinfo.winbottom,cio_textinfo.winleft,cio_textinfo.cury+1);
	ciolib_gotoxy(1,cio_textinfo.cury);
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}

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/* Not overridable due to varargs */
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CIOLIBEXPORT int CIOLIBCALL ciolib_cprintf(char *fmat, ...)
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{
    va_list argptr;
	int		ret;
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#ifdef _MSC_VER		/* Can't figure out a way to allocate a "big enough" buffer for Win32. */
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	char	str[16384];
#else
	char	*str;
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#ifndef HAVE_VASPRINTF
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	va_list argptr2;
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#endif
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#endif

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	CIOLIB_INIT();
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    va_start(argptr,fmat);
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#ifdef HAVE_VASPRINTF
	ret=vasprintf(&str, fmat, argptr);
	if(ret>=0)
		ciolib_cputs(str);
	else
		ret=EOF;
	free(str);
#else

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#ifdef _MSC_VER
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	ret=_vsnprintf(str,sizeof(str)-1,fmat,argptr);
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#else
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#ifdef __BORLANDC__
	argptr2=argptr;
#else
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	va_copy(argptr2, argptr);
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#endif
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    ret=vsnprintf(NULL,0,fmat,argptr);
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	if(ret<0)
		return(EOF);
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	str=(char *)alloca(ret+1);
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	if(str==NULL)
		return(EOF);
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	ret=vsprintf(str,fmat,argptr2);
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#endif
    va_end(argptr);
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    va_end(argptr2);
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#endif
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	if(ret>=0)
		ciolib_cputs(str);
	else
		ret=EOF;
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#endif

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    return(ret);
}

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/* Optional */
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CIOLIBEXPORT int CIOLIBCALL ciolib_cputs(char *str)
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{
	int		pos;
	int		ret=0;
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	int		olddmc;
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	CIOLIB_INIT();
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	if(cio_api.cputs)
		return(cio_api.cputs(str));

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	olddmc=hold_update;
	hold_update=1;
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	for(pos=0;str[pos];pos++)
	{
		ret=str[pos];
		if(str[pos]=='\n')
			ciolib_putch('\r');
		ciolib_putch(str[pos]);
	}
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	ciolib_gotoxy(ciolib_wherex(),ciolib_wherey());
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	return(ret);
}

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/* Optional... and overriding is silly */
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CIOLIBEXPORT void CIOLIBCALL ciolib_textbackground(int colour)
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{
	unsigned char attr;
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	CIOLIB_INIT();
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	if(cio_api.textbackground) {
		cio_api.textbackground(colour);
		return;
	}

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	attr=cio_textinfo.attribute;
	attr&=143;
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	col=(colour & 0x07);
	attr|=(col<<4);
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	ciolib_textattr(attr);
}

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CIOLIBEXPORT void CIOLIBCALL ciolib_textcolor(int colour)
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{
	unsigned char attr;
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	unsigned char col;
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	CIOLIB_INIT();
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	if(cio_api.textcolor) {
		cio_api.textcolor(colour);
		return;
	}

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	attr=cio_textinfo.attribute;
	attr&=240;
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	col=colour&0x0f;
	attr|=col;
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	ciolib_textattr(attr);
}

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CIOLIBEXPORT void CIOLIBCALL ciolib_highvideo(void)
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{
	int attr;

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	CIOLIB_INIT();
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	if(cio_api.highvideo) {
		cio_api.highvideo();
		return;
	}

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	attr=cio_textinfo.attribute;
	attr |= 8;
	ciolib_textattr(attr);
}

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CIOLIBEXPORT void CIOLIBCALL ciolib_lowvideo(void)
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{
	int attr;

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	CIOLIB_INIT();
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	if(cio_api.lowvideo) {
		cio_api.lowvideo();
		return;
	}

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	attr=cio_textinfo.attribute;
	attr &= 0xf7;
	ciolib_textattr(attr);
}

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/* Optional... and overriding is silly */
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CIOLIBEXPORT void CIOLIBCALL ciolib_normvideo(void)
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{
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	CIOLIB_INIT();
	
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	if(cio_api.normvideo) {
		cio_api.normvideo();
		return;
	}
	ciolib_textattr(cio_textinfo.normattr);
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}

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CIOLIBEXPORT int CIOLIBCALL ciolib_puttext(int a,int b,int c,int d,unsigned char *e)
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{
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	CIOLIB_INIT();
	
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	return(cio_api.puttext(a,b,c,d,e));
}

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/* **MUST** be implemented */