Category : Word Processors
Archive   : PDSRT321.ZIP
Filename : ISDEV.C

 
Output of file : ISDEV.C contained in archive : PDSRT321.ZIP
/*
* 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
#include

int
isdevice (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);
}

  3 Responses to “Category : Word Processors
Archive   : PDSRT321.ZIP
Filename : ISDEV.C
”

  1. Daniel says:
    January 27, 2013 at 3:59 pm

    Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. Joshie says:
    March 18, 2014 at 4:57 pm

    This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. DiskingRound says:
    January 14, 2015 at 10:57 pm

    But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/