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/*
** OS_ID.C
**
** based upon a public domain work by David Gibbs
*/
#define TEST
#define OS_ID_MAIN
#include "os_id.h"
#include <dos.h>
struct i_os_ver id_os_ver[TOT_OS];
int id_os_type;
int id_os;
const char *id_os_name[TOT_OS] = {
"DOS",
"OS/2 DOS",
"DESQview",
"Windows Std",
"Windows 386"
};
int get_os (void)
{
union REGS t_regs;
int osmajor, osminor;
id_os_type = 0;
id_os = 0;
/* test for DOS or OS/2 */
t_regs.h.ah = 0x30;
int86(0x21, &t_regs, &t_regs);
osmajor = t_regs.h.al;
osminor = t_regs.h.ah;
if (osmajor < 10)
{
id_os_ver[DOS].maj = osmajor;
id_os_ver[DOS].min = osminor;
id_os_type = id_os_type | is_DOS;
}
else
{
/* OS/2 v1.x DOS Box returns 0x0A */
id_os_type = id_os_type | is_OS2;
/* OS/2 v2.x DOS Box returns 0x14 */
id_os_ver[OS2].maj = osmajor/10;
id_os_ver[OS2].min = osminor;
}
/* test for Windows */
t_regs.x.ax = 0x4680;
int86(0x2F, &t_regs, &t_regs);
if (t_regs.x.ax == 0x0000)
{
id_os_ver[WINS].maj = 3;
id_os_ver[WINS].min = 0;
id_os_type = id_os_type | is_WINS;
}
else
{
t_regs.x.ax = 0x1600 ;
int86(0x2F, &t_regs, &t_regs);
switch (t_regs.h.al)
{
case 0x00 :
case 0x80 :
case 0x01 :
case 0xFF :
break;
default :
id_os_type = id_os_type | is_WIN3;
id_os_ver[WIN3].maj = t_regs.h.al;
id_os_ver[WIN3].min = t_regs.h.ah;
break ;
} /* endswitch */
} /* endif */
/* Test for DESQview */
t_regs.x.cx = 0x4445; /* load incorrect date */
t_regs.x.dx = 0x5351;
t_regs.x.ax = 0x2B01; /* DV set up call */
intdos(&t_regs, &t_regs);
if (t_regs.h.al != 0xFF)
{
id_os_type = id_os_type | is_DV;
id_os_ver[DV].maj = t_regs.h.bh;
id_os_ver[DV].min = t_regs.h.bl;
}
if (id_os_type & is_DOS)
id_os = DOS;
if (id_os_type & is_WINS)
id_os = WINS;
if (id_os_type & is_WIN3)
id_os = WIN3;
if (id_os_type & is_DV)
id_os = DV;
if (id_os_type & is_OS2)
id_os = OS2;
return(id_os);
}
#ifdef TEST
#include <stdio.h>
int main(void)
{
int ostype = get_os();
printf("%s version %d.%d\n",
id_os_name[ostype],
id_os_ver[ostype].maj,
id_os_ver[ostype].min);
return(0);
}
#endif
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