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FWIDE(3P)                  POSIX Programmer's Manual                 FWIDE(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

NAME
       fwide - set stream orientation

SYNOPSIS
       #include <stdio.h>
       #include <wchar.h>

       int fwide(FILE *stream, int mode);


DESCRIPTION
       The  fwide()  function  shall  determine the orientation of the stream pointed to by stream. If mode is greater
       than zero, the function first attempts to make the stream wide-oriented.  If mode is less than zero, the  func-
       tion  first  attempts to make the stream byte-oriented. Otherwise, mode is zero and the function does not alter
       the orientation of the stream.

       If the orientation of the stream has already been determined, fwide() shall not change it.

       Since no return value is reserved to indicate an error, an application wishing to check  for  error  situations
       should  set  errno  to  0,  then  call  fwide(),  then  check errno, and if it is non-zero, assume an error has
       occurred.

RETURN VALUE
       The fwide() function shall return a value greater than zero if, after the call, the  stream  has  wide-orienta-
       tion, a value less than zero if the stream has byte-orientation, or zero if the stream has no orientation.

ERRORS
       The fwide() function may fail if:

       EBADF  The stream argument is not a valid stream.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       A call to fwide() with mode set to zero can be used to determine the current orientation of a stream.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       The Base Definitions volume of IEEE Std 1003.1-2001, <wchar.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  Issue  6,  Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The
       Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Stan-
       dard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The original Standard can be
       obtained online at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                            FWIDE(3P)