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

       fwide - set and determine the orientation of a FILE stream

       #include <wchar.h>

       int fwide(FILE *stream, int mode);

       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 orien-
       tation (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

       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.

       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.

       ISO/ANSI C, UNIX98

       fprintf(3), fwprintf(3)

       Wide-character output to a byte oriented stream can be performed through the fprintf func-
       tion 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)
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