ciolib.c 43.6 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)		*
 *																			*
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 * Copyright Rob Swindell - http://www.synchro.net/copyright.html			*
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 *																			*
 * 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"
		/* DO NOT REMOVE THE EXTRA \r! */
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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"
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 #include "sdlfuncs.h"
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#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[]={1,9,17,25,33,41,49,57,65,73,81,89,97,105,113,121,129,137,145};
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static int ungotch;
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struct text_info cio_textinfo;
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uint32_t ciolib_fg;
uint32_t ciolib_bg;
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static int lastmode=C80;
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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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CIOLIBEXPORT int ciolib_xlat=0;
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CIOLIBEXPORT int ciolib_reaper=TRUE;
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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);
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CIOLIBEXPORT int	CIOLIBCALL ciolib_cprintf(const char *fmat, ...);
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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);
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CIOLIBEXPORT int CIOLIBCALL ciolib_puttext(int a,int b,int c,int d,void *e);
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CIOLIBEXPORT int CIOLIBCALL ciolib_pputtext(int a,int b,int c,int d,void *e,uint32_t *f, uint32_t *g);
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CIOLIBEXPORT int CIOLIBCALL ciolib_gettext(int a,int b,int c,int d,void *e);
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CIOLIBEXPORT int CIOLIBCALL ciolib_pgettext(int a,int b,int c,int d,void *e, uint32_t *f, uint32_t *g);
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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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CIOLIBEXPORT void CIOLIBCALL ciolib_setscaling(int new_value);
CIOLIBEXPORT int CIOLIBCALL ciolib_getscaling(void);
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CIOLIBEXPORT int CIOLIBCALL ciolib_setpalette(uint32_t entry, uint16_t r, uint16_t g, uint16_t b);
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CIOLIBEXPORT int CIOLIBCALL ciolib_cputch(uint32_t fg_palette, uint32_t bg_palette, int a);
CIOLIBEXPORT int CIOLIBCALL ciolib_ccputs(uint32_t fg_palette, uint32_t bg_palette, const char *str);
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CIOLIBEXPORT int CIOLIBCALL ciolib_attr2palette(uint8_t attr, uint32_t *fg, uint32_t *bg);
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CIOLIBEXPORT int CIOLIBCALL ciolib_setpixel(uint32_t x, uint32_t y, uint32_t colour);
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CIOLIBEXPORT struct ciolib_pixels * CIOLIBCALL ciolib_getpixels(uint32_t sx, uint32_t sy, uint32_t ex, uint32_t ey);
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CIOLIBEXPORT int CIOLIBCALL ciolib_setpixels(uint32_t sx, uint32_t sy, uint32_t ex, uint32_t ey, uint32_t x_off, uint32_t y_off, struct ciolib_pixels *pixels, void *mask);
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CIOLIBEXPORT void CIOLIBCALL ciolib_freepixels(struct ciolib_pixels *pixels);
CIOLIBEXPORT struct ciolib_screen * CIOLIBCALL ciolib_savescreen(void);
CIOLIBEXPORT void CIOLIBCALL ciolib_freescreen(struct ciolib_screen *);
CIOLIBEXPORT int CIOLIBCALL ciolib_restorescreen(struct ciolib_screen *scrn);
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CIOLIBEXPORT void CIOLIBCALL ciolib_setcolour(uint32_t fg, uint32_t bg);
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CIOLIBEXPORT uint32_t * CIOLIBCALL ciolib_get_modepalette(uint32_t p[16]);
CIOLIBEXPORT int CIOLIBCALL ciolib_set_modepalette(uint32_t p[16]);
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#if defined(WITH_SDL) || defined(WITH_SDL_AUDIO)
int sdl_video_initialized = 0;
#endif

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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;
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		cio_api.pputtext=bitmap_pputtext;
		cio_api.pgettext=bitmap_pgettext;
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		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.getcustomcursor=bitmap_getcustomcursor;
		cio_api.setcustomcursor=bitmap_setcustomcursor;
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		cio_api.getvideoflags=bitmap_getvideoflags;
		cio_api.setvideoflags=bitmap_setvideoflags;
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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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		cio_api.setscaling=sdl_setscaling;
		cio_api.getscaling=sdl_getscaling;
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		cio_api.setpalette=sdl_setpalette;
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		cio_api.attr2palette=bitmap_attr2palette;
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		cio_api.setpixel=bitmap_setpixel;
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		cio_api.getpixels=bitmap_getpixels;
		cio_api.setpixels=bitmap_setpixels;
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		cio_api.get_modepalette=bitmap_get_modepalette;
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		cio_api.set_modepalette=bitmap_set_modepalette;
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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 defined(WITH_SDL) || defined(WITH_SDL_AUDIO)
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	if (sdl_video_initialized) {
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		sdl.QuitSubSystem(SDL_INIT_VIDEO);
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		sdl_video_initialized = FALSE;
	}
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#endif

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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;
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		cio_api.pputtext=bitmap_pputtext;
		cio_api.pgettext=bitmap_pgettext;
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		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.getcustomcursor=bitmap_getcustomcursor;
		cio_api.setcustomcursor=bitmap_setcustomcursor;
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		cio_api.getvideoflags=bitmap_getvideoflags;
		cio_api.setvideoflags=bitmap_setvideoflags;
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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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		cio_api.setscaling=x_setscaling;
		cio_api.getscaling=x_getscaling;
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		cio_api.setpalette=x_setpalette;
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		cio_api.attr2palette=bitmap_attr2palette;
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		cio_api.setpixel=bitmap_setpixel;
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		cio_api.getpixels=bitmap_getpixels;
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		cio_api.setpixels=bitmap_setpixels;
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		cio_api.get_modepalette=bitmap_get_modepalette;
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		cio_api.set_modepalette=bitmap_set_modepalette;
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		return(1);
	}
	return(0);
}
 #endif

int try_curses_init(int mode)
{
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#if defined(WITH_SDL) || defined(WITH_SDL_AUDIO)
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	if (sdl_video_initialized) {
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		sdl.QuitSubSystem(SDL_INIT_VIDEO);
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		sdl_video_initialized = FALSE;
	}
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#endif

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	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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		cio_api.setvideoflags=curs_setvideoflags;
		cio_api.getvideoflags=curs_getvideoflags;
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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)
{
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#if defined(WITH_SDL) || defined(WITH_SDL_AUDIO)
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	if (sdl_video_initialized) {
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		sdl.QuitSubSystem(SDL_INIT_VIDEO);
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		sdl_video_initialized = FALSE;
	}
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#endif

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	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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{
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#if defined(WITH_SDL) || defined(WITH_SDL_AUDIO)
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	if (sdl_video_initialized) {
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		sdl.QuitSubSystem(SDL_INIT_VIDEO);
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		sdl_video_initialized = FALSE;
	}
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#endif

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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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		cio_api.getcustomcursor=win32_getcustomcursor;
		cio_api.setcustomcursor=win32_setcustomcursor;
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		cio_api.getvideoflags=win32_getvideoflags;
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		cio_api.setpalette=win32_setpalette;
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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:
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			cio_textinfo.normattr=LIGHTGRAY;
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	}
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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)
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		return(cio_api.getche());
	else {
		while(1) {
			ch=ciolib_getch();
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			if(ch != 0 && ch != 0xe0) {
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				ciolib_putch(ch);
				return(ch);
			}
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			/* Eat extended chars - except ESC which is an abort */
			if(ciolib_getch()==1)
				return(EOF);
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		}
	}
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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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	uint32_t *fgb = NULL;
	uint32_t *bgb = NULL;
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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 *)malloc((width+1)*(height+1)*2);
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	if(buf==NULL)
		return(0);
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	if (cio_api.pgettext) {
		fgb=(uint32_t *)malloc((width+1)*(height+1)*sizeof(fgb[0]));
		if (fgb == NULL) {
			free(buf);
			return 0;
		}

		bgb=(uint32_t *)malloc((width+1)*(height+1)*sizeof(bgb[0]));
		if (bgb == NULL) {
			free(fgb);
			free(buf);
			return 0;
		}
		if(!ciolib_pgettext(sx,sy,ex,ey,buf,fgb,bgb))
			goto fail;
		if(!ciolib_pputtext(dx,dy,dx+width,dy+height,buf,fgb,bgb))
			goto fail;
	}
	else {
		if(!ciolib_gettext(sx,sy,ex,ey,buf))
			goto fail;
		if(!ciolib_puttext(dx,dy,dx+width,dy+height,buf))
			goto fail;
	}

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	return(1);
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fail:
	free(buf);
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	if (fgb)
		free(fgb);
	if (bgb)
		free(bgb);
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	return 0;
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}

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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) {
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			case 0:		/* Skip extended keys */
			case 0xe0:	/* Skip extended keys */
				if(ciolib_getche()==1)
					goto early_return;
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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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early_return:
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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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#if defined(_MSC_VER) && (_MSC_VER < 1800)	/* Use lame vsscanf() implementation */
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/* 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) {
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			case 0:		/* Skip extended keys */
			case 0xe0:	/* Skip extended keys */
				if(ciolib_getch()==1)
					goto early_return;
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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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early_return:
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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=cio_textinfo;
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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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/* **MUST** be implemented */
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CIOLIBEXPORT void CIOLIBCALL ciolib_textmode(int mode)
807
{
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	CIOLIB_INIT();
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	if(mode==LASTMODE) {
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		cio_api.textmode(lastmode);
		lastmode=cio_textinfo.currmode;
	}
	else {
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		if(mode==64)
			mode=C80X50;
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		if(mode==_ORIGMODE)
			mode=C80;
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		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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/* Optional */
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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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/* Optional */
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CIOLIBEXPORT void CIOLIBCALL ciolib_clreol(void)
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{
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	unsigned char *buf;
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	uint32_t *fgbuf = NULL;
	uint32_t *bgbuf = NULL;
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	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 *)malloc(width*height*2);
	if (!buf)
		return;
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	if (cio_api.pputtext) {
		fgbuf = malloc(width*height*sizeof(fgbuf[0]));
		if (!fgbuf) {
			free(buf);
			return;
		}
		bgbuf = malloc(width*height*sizeof(bgbuf[0]));
		if (!bgbuf) {
			free(fgbuf);
			free(buf);
			return;
		}
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		for (i = 0; i < width*height; i++) {
			fgbuf[i] = ciolib_fg;
			bgbuf[i] = ciolib_bg;
		}
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	}
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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_pputtext(
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			cio_textinfo.curx+cio_textinfo.winleft-1,
			cio_textinfo.cury+cio_textinfo.wintop-1,
			cio_textinfo.winright,
			cio_textinfo.cury+cio_textinfo.wintop-1,
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			buf, fgbuf, bgbuf);
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	if (fgbuf)
		free(fgbuf);
	if (bgbuf)
		free(bgbuf);
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	free(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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	uint32_t *fgbuf = NULL;
	uint32_t *bgbuf = NULL;
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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 *)malloc(width*height*2);
	if(!buf)
		return;
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	if (cio_api.pputtext) {
		fgbuf = malloc(width*height*sizeof(fgbuf[0]));
		if (!fgbuf) {
			free(buf);
			return;
		}
		bgbuf = malloc(width*height*sizeof(bgbuf[0]));
		if (!bgbuf) {
			free(fgbuf);
			free(buf);
			return;
		}
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		for (i = 0; i < width*height; i++) {
			fgbuf[i] = ciolib_fg;
			bgbuf[i] = ciolib_bg;
		}
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	}
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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_pputtext(cio_textinfo.winleft,cio_textinfo.wintop,cio_textinfo.winright,cio_textinfo.winbottom,buf,fgbuf,bgbuf);
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	ciolib_gotoxy(1,1);
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	puttext_can_move=old_ptcm;
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	if (fgbuf)
		free(fgbuf);
	if (bgbuf)
		free(bgbuf);
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	free(buf);
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}

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/* Optional */
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CIOLIBEXPORT void CIOLIBCALL ciolib_delline(void)
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{