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