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 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 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 orienta-
tion (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 ori-
ented. 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)
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