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 cur
rent 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-charac
ter 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-char
acter 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.
Man(1) output converted with
man2html