FWIDE(3) Linux Programmer's Manual FWIDE(3)
NAME
fwide - set and determine the orientation of a FILE stream
SYNOPSIS
#include<wchar.h>
intfwide(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.
RETURNVALUE
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.
CONFORMINGTO
ISO/ANSI C, UNIX98
SEEALSO
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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