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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 differ (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  function  first  attempts to make the stream byte-oriented. Other‐
       wise, 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-orientation, a value less	than  zero  if
       the  stream has byte-orientation, or zero if the stream has no orienta‐
       tion.

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, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications 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 Standard, 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)
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