home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Tricks of the Windows Gam…ming Gurus (2nd Edition)
/
Disc2.iso
/
vc98
/
crt
/
src
/
freopen.c
< prev
next >
Wrap
C/C++ Source or Header
|
1998-06-17
|
2KB
|
77 lines
/***
*freopen.c - close a stream and assign it to a new file
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines freopen() - close and reopen file, typically used to redirect
* stdin/out/err/prn/aux.
*
*******************************************************************************/
#include <cruntime.h>
#include <stdio.h>
#include <file2.h>
#include <share.h>
#include <dbgint.h>
#include <internal.h>
#include <mtdll.h>
#include <tchar.h>
/***
*FILE *freopen(filename, mode, stream) - reopen stream as new file
*
*Purpose:
* Closes the file associated with stream and assigns stream to a new
* file with current mode. Usually used to redirect a standard file
* handle.
*
*Entry:
* char *filename - new file to open
* char *mode - new file mode, as in fopen()
* FILE *stream - stream to close and reassign
*
*Exit:
* returns stream if successful
* return NULL if fails
*
*Exceptions:
*
*******************************************************************************/
FILE * __cdecl _tfreopen (
const _TSCHAR *filename,
const _TSCHAR *mode,
FILE *str
)
{
REG1 FILE *stream;
FILE *retval;
_ASSERTE(filename != NULL);
_ASSERTE(*filename != _T('\0'));
_ASSERTE(mode != NULL);
_ASSERTE(str != NULL);
/* Init stream pointer */
stream = str;
_lock_str(stream);
/* If the stream is in use, try to close it. Ignore possible
* error (ANSI 4.9.5.4). */
if ( inuse(stream) )
_fclose_lk(stream);
stream->_ptr = stream->_base = NULL;
stream->_cnt = stream->_flag = 0;
#ifdef _UNICODE
retval = _wopenfile(filename,mode,_SH_DENYNO,stream);
#else /* _UNICODE */
retval = _openfile(filename,mode,_SH_DENYNO,stream);
#endif /* _UNICODE */
_unlock_str(stream);
return(retval);
}