FWIDE(3)		   Linux Programmer's Manual		      FWIDE(3)

NAME
       fwide - set and determine the orientation of a FILE stream

SYNOPSIS
       #include <wchar.h>

       int fwide(FILE *stream, int mode);

DESCRIPTION
       When mode is zero, the fwide() function determines the current orienta‐
       tion of stream. It returns a value > 0 if stream is wide-character ori‐
       ented,  i.e.  if wide character I/O is permitted but char I/O is disal‐
       lowed. It returns a value < 0 if stream is byte oriented, i.e. if  char
       I/O  is permitted but wide character I/O is disallowed. It returns zero
       if stream has no orientation yet; in this case the next	I/O  operation
       might  change  the  orientation	(to  byte oriented if it is a char I/O
       operation, or to wide-character oriented if it is a wide character  I/O
       operation).

       Once  a	stream	has  an orientation, it cannot be changed and persists
       until the stream is closed.

       When mode is non-zero, the  fwide()  function  first  attempts  to  set
       stream's	 orientation  (to  wide-character  oriented if mode > 0, or to
       byte oriented if mode < 0). It then returns a value denoting  the  cur‐
       rent orientation, as above.

RETURN VALUE
       The  fwide()  function returns the stream's orientation, after possibly
       changing it. A return value > 0 means wide-character oriented. A return
       value < 0 means byte oriented. A return value of zero means undecided.

CONFORMING TO
       ISO/ANSI C, POSIX.1-2001.

SEE ALSO
       fprintf(3), fwprintf(3)

NOTES
       Wide-character  output  to  a  byte  oriented  stream  can be performed
       through the fprintf() function with the %lc and %ls directives.

       Char oriented output to a wide-character oriented stream	 can  be  per‐
       formed through the fwprintf() function with the %c and %s directives.

GNU				  1999-11-17			      FWIDE(3)

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