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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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isatty.c
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C/C++ Source or Header
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1998-06-17
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1KB
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53 lines
/***
*isatty.c - check if file handle refers to a device
*
* Copyright (c) 1989-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines _isatty() - check if file handle refers to a device
*
*******************************************************************************/
#include <cruntime.h>
#include <msdos.h>
#include <internal.h>
#include <io.h>
/***
*int _isatty(handle) - check if handle is a device
*
*Purpose:
* Checks if the given handle is associated with a character device
* (terminal, console, printer, serial port)
*
*Entry:
* int handle - handle of file to be tested
*
*Exit:
* returns non-0 if handle refers to character device,
* returns 0 otherwise
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _isatty (
int fh
)
{
/* see if file handle is valid, otherwise return FALSE */
#ifndef _MAC
if ( (unsigned)fh >= (unsigned)_nhandle )
#else /* _MAC */
if ((unsigned)fh >= (unsigned)_nfile)
#endif /* _MAC */
return 0;
/* check file handle database to see if device bit set */
#ifndef _MAC
return (int)(_osfile(fh) & FDEV);
#else /* _MAC */
return (int)(_osfile[fh] & FDEV);
#endif /* _MAC */
}