home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Magnum One
/
Magnum One (Mid-American Digital) (Disc Manufacturing).iso
/
d22
/
csap208b.arc
/
ISDEV.C
< prev
next >
Wrap
Text File
|
1989-10-10
|
997b
|
31 lines
/* ISDEVICE - Will invoke Ms-Dos IOCTL function to "get" the attributes
of the specified DOS handle.
Result := True If the specified handle is a device.
:= False If the specified handle is a file.
Caution: A True return only indicates that the handle is
assigned to a device driver. These include the
CON, PRN, AUX and any user installed device drivers.
A False return indicates that the handle is assigned
to a file that may be on a Floppy, Hard Disk or
Ram Disk.
*/
#include <stdio.h>
#include <dos.h>
isdevice (handle)
int handle;
{
union REGS R;
R.x.ax = 0x4400; /* MS-DOS IOCTL "Get" function */
R.x.bx = handle; /* ... Handle for IOCTL "Get" */
R.x.dx = 0;
intdos(&R, &R); /* ... MS-DOS Entry Interrupt */
if ((R.x.dx & 0x80) == 0) return(0);
else return(1);
}