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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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tell.c
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1998-06-17
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/***
*tell.c - find file position
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* contains _tell() - find file position
*
*******************************************************************************/
#ifndef _MAC
#include <cruntime.h>
#include <io.h>
/***
*long _tell(filedes) - find file position
*
*Purpose:
* Gets the current position of the file pointer (no adjustment
* for buffering).
*
*Entry:
* int filedes - file handle of file
*
*Exit:
* returns file position or -1L (sets errno) if bad file descriptor or
* pipe
*
*Exceptions:
*
*******************************************************************************/
long __cdecl _tell (
int filedes
)
{
return(_lseek(filedes,0L,1));
}
#else /* _MAC */
#include <cruntime.h>
#include <stdio.h>
#include <errno.h>
#include <io.h>
#include <internal.h>
#include <stddef.h>
#include <stdlib.h>
#include <memory.h>
#include <msdos.h>
#include <macos\files.h>
#include <macos\errors.h>
/***
*long _tell(fh) - find file position
*
*Purpose:
* Gets the current position of the file pointer (no adjustment
* for buffering).
*
*Entry:
* int fh - file handle of file
*
*Exit:
* returns file position or -1L (sets errno) if bad file descriptor or
* pipe
*
*Exceptions:
*
*******************************************************************************/
long __cdecl _tell (
int fh
)
{
ParamBlockRec parm;
OSErr osErr;
/* validate handle */
if ( ((unsigned)fh >= (unsigned)_nfile) ||
!(_osfile[fh] & FOPEN) ||
(_osfile[fh] & FDEV) )
{
/* out of range -- return error */
errno = EBADF;
_macerrno = 0;
return -1;
}
memset(&parm, 0, sizeof(ParamBlockRec));
parm.ioParam.ioRefNum = _osfhnd[fh];
osErr = PBGetFPosSync(&parm);
switch (osErr)
{
case noErr:
return parm.ioParam.ioPosOffset;
default:
errno = EIO;
return -1;
}
}
#endif /* _MAC */