redhat man page for fwide

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 orientation 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 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 opera-
       tion 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
       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
       ISO/ANSI C, UNIX98

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

GNU
								    1999-11-17								  FWIDE(3)