fwide man page on Archlinux

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

       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.

       fwide — set stream orientation

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

       int fwide(FILE *stream, int mode);

       The functionality described on this reference page is aligned with  the
       ISO C  standard.	 Any  conflict between the requirements described here
       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
       defers to the ISO C standard.

       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.

       The  fwide() function shall not change the setting of errno if success‐

       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

       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‐

       The fwide() function may fail if:

       EBADF  The stream argument is not a valid stream.

       The following sections are informative.


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



       The Base Definitions volume of POSIX.1‐2008, <stdio.h>, <wchar.h>

       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  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.unix.org/online.html .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			     FWIDE(3P)

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