www.pudn.com > minix.instalation.cd-rom-2.0.rar > HOST_OS.CPP

// host_os.cpp	host operating system classes  
//		dave mccaldon (d.mccalden@staffordshire.ac.uk)  
  
#include "host_os.h"  
#include   
#include   
#include   
#include   
  
char *msdos_info (void)  
{  
	return ("MS-DOS version %d.%d");  
};  
  
char *dosemu_info (void)  
{  
	return ("Linux dosemu version %d.%d");  
};  
  
char *mswindows_info (void)  
{  
	return ("MS-Windows version %d.%d");  
};  
  
char *desqview_info (void)  
{  
	return ("Desq-View version %d.%d");  
};  
  
host_os::host_os (void)  
{  
	status = NOT_OK;  
	if (mswindows_detect () == true) format = mswindows_info;  
//	else if (dosemu_detect () == true) format = dosemu_info;  
	else if (desqview_detect () == true) format = desqview_info;  
	else  
	{  
		status = OK;  
		msdos_version ();  
		format = msdos_info;  
	}  
}  
  
  
char *host_os::information( char *p )  
{  
	if( p == NULL )  
		p = (char *) malloc( strlen( format() ) + 12 );  
	sprintf( p, format(), ver_major, ver_minor );  
  
	return p;  
}  
  
void host_os::msdos_version()  
{  
	ver_major = _osmajor;			// borlandc constants  
	ver_minor = _osminor;  
}  
  
boolean host_os::mswindows_detect()  
{  
	union   REGS r;  
  
	r.x.ax = 0x1600;  
	int86( 0x2F, &r, &r );  
	if( r.h.al & 0x7F )  
	{  
		ver_major = r.h.al;  
		ver_minor = r.h.ah;  
		return (true);  
	}  
  
	return (false);  
}  
  
boolean host_os::dosemu_detect()  
{  
	union   REGS r;  
  
	// this is slightly more difficult than just calling the dosemu  
	// interrupt (0xE5), we need to check if the interrupt has a  
	// handler, as DOS and BIOS don't establish a default handler  
  
	if( getvect( 0xE5 ) == NULL )  
		return (false);  
	r.x.ax = 0;  
	int86( 0xE5, &r, &r );  
	if( r.x.ax == 0xAA55 )			// check signature  
	{  
		ver_major = r.h.bh;  
		ver_minor = r.h.bl;  
		return (true);  
	}  
  
	return (false);  
}  
  
boolean host_os::desqview_detect()  
{  
	union   REGS r;  
  
	r.x.ax = 0x2B01;                // AL=01 => get desqview version  
	r.x.cx = 0x4445;		// CX = 'DE'  
	r.x.dx = 0x5351;		// DX = 'SQ'  
	int86( 0x21, &r, &r );  
	if( r.h.al != 0xFF )  
	{  
		ver_major = r.h.bh;  
		ver_minor = r.h.bl;  
		return (true);  
	}  
  
	return (false);  
}