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FWIDE(3) Linux Programmer's Manual FWIDE(3)
fwide - set and determine the orientation of a FILE stream
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
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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