89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
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/***
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*fleni64.c - find length of a file
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*
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* Copyright (c) 1994-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines _filelengthi64() - find the length of a file
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*
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*Revision History:
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* 11-18-94 GJF Created. Adapted from flength.c
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* 06-27-95 GJF Added check that the file handle is open.
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* 12-19-97 GJF Exception-safe locking.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <stdio.h>
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#include <errno.h>
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#include <io.h>
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#include <internal.h>
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#include <msdos.h>
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#include <mtdll.h>
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#include <stddef.h>
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#include <stdlib.h>
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/***
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*__int64 _filelengthi64(filedes) - find length of a file
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*
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*Purpose:
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* Returns the length in bytes of the specified file.
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*
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*Entry:
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* int filedes - handle referring to file to find length of
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*
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*Exit:
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* returns length of file in bytes
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* returns -1i64 if fails
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*
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*Exceptions:
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*
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*******************************************************************************/
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__int64 __cdecl _filelengthi64 (
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int filedes
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)
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{
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__int64 length;
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__int64 here;
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if ( ((unsigned)filedes >= (unsigned)_nhandle) ||
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!(_osfile(filedes) & FOPEN) )
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{
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errno = EBADF;
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_doserrno = 0L; /* not an OS error */
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return(-1i64);
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}
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#ifdef _MT
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_lock_fh(filedes);
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__try {
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if ( _osfile(filedes) & FOPEN ) {
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#endif /* _MT */
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/* Seek to end (and back) to get the file length. */
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if ( (here = _lseeki64_lk( filedes, 0i64, SEEK_CUR )) == -1i64 )
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length = -1i64; /* return error */
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else {
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length = _lseeki64_lk( filedes, 0i64, SEEK_END );
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if ( here != length )
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_lseeki64_lk( filedes, here, SEEK_SET );
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}
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#ifdef _MT
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}
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else {
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errno = EBADF;
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_doserrno = 0L;
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length = -1i64;
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}
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}
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__finally {
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_unlock_fh(filedes);
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}
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#endif /* _MT */
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return( length );
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}
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