NAME    [Toc]    [Back]

       fwide - set and determine the orientation of a FILE stream

SYNOPSIS    [Toc]    [Back]

       #include <wchar.h>

       int fwide (FILE* stream, int mode);

DESCRIPTION    [Toc]    [Back]

       When  mode  is zero, the fwide function determines the current orientation
 of stream. It returns a value > 0 if stream is wide-character oriented,
  i.e.  if wide character I/O is permitted but char I/O is disallowed.
 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  current
 orientation, as above.

RETURN VALUE    [Toc]    [Back]

       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 zero means undecided.

CONFORMING TO    [Toc]    [Back]

       ISO/ANSI C, UNIX98

SEE ALSO    [Toc]    [Back]

       fprintf(3), fwprintf(3)

NOTES    [Toc]    [Back]

       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  performed
 through the fwprintf function with the %c and %s directives.



GNU				  1999-11-17			      FWIDE(3)