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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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eof.c
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1998-06-17
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/***
*eof.c - test a handle for end of file
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines _eof() - determine if a file is at eof
*
*******************************************************************************/
#ifndef _MAC
#include <cruntime.h>
#include <io.h>
#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <internal.h>
#include <msdos.h>
#include <mtdll.h>
/***
*int _eof(filedes) - test a file for eof
*
*Purpose:
* see if the file length is the same as the present position. if so, return
* 1. if not, return 0. if an error occurs, return -1
*
*Entry:
* int filedes - handle of file to test
*
*Exit:
* returns 1 if at eof
* returns 0 if not at eof
* returns -1 and sets errno if fails
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _eof (
int filedes
)
{
long here;
long end;
int retval;
if ( ((unsigned)filedes >= (unsigned)_nhandle) ||
!(_osfile(filedes) & FOPEN) )
{
errno = EBADF;
_doserrno = 0;
return(-1);
}
/* Lock the file */
_lock_fh(filedes);
/* See if the current position equals the end of the file. */
if ( ((here = _lseek_lk(filedes, 0L, SEEK_CUR)) == -1L) ||
((end = _lseek_lk(filedes, 0L, SEEK_END)) == -1L) )
retval = -1;
else if ( here == end )
retval = 1;
else {
_lseek_lk(filedes, here, SEEK_SET);
retval = 0;
}
/* Unlock the file */
_unlock_fh(filedes);
/* Done */
return(retval);
}
#else /* _MAC */
#include <cruntime.h>
#include <io.h>
#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <internal.h>
#include <memory.h>
#include <msdos.h>
#include <macos\files.h>
#include <macos\errors.h>
/***
*int _eof(fh) - test a file for eof
*
*Purpose:
* see if the file length is the same as the present position. if so, return
* 1. if not, return 0. if an error occurs, return -1
*
*Entry:
* int filedes - handle of file to test
*
*Exit:
* returns 1 if at eof
* returns 0 if not at eof
* returns -1 and sets errno if fails
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _eof (
int fh
)
{
long end;
ParamBlockRec param;
OSErr osErr;
if ( (unsigned)fh >= (unsigned)_nfile || !(_osfile[fh] & FOPEN) )
{
errno = EBADF;
_macerrno = 0;
return -1;
}
if (_osfile[fh] & FDEV)
{
return 0; /*console is never at eof*/
}
/* See if the current position equals the end of the file. */
memset(¶m, 0, sizeof(ParamBlockRec));
param.ioParam.ioRefNum = _osfhnd[fh];
osErr = PBGetEOFSync(¶m);
if (osErr == noErr)
{
end = (long)param.ioParam.ioMisc;
osErr = PBGetFPosSync(¶m);
if (osErr == noErr)
{
if (end == param.ioParam.ioPosOffset)
{
return 1;
}
else
{
return 0;
}
}
}
_dosmaperr(osErr);
return -1;
}
#endif /* _MAC */