FWIDE(3C) Standard C Library Functions FWIDE(3C)
NAME
fwide - set stream orientation
SYNOPSIS
#include <stdio.h>
#include <wchar.h>
int fwide(
FILE *stream,
int mode);
DESCRIPTION
The
fwide() function determines the orientation of the stream pointed
to by
stream. If
mode is greater than 0, the function first attempts
to make the stream wide-oriented. If
mode is less than 0, the
function first attempts to make the stream byte-oriented. Otherwise,
mode is 0 and the function does not alter the orientation of the
stream.
If the orientation of the stream has already been determined,
fwide() does not change it.
Because no return value is reserved to indicate an error, an
application wishing to check for error situations should set
errno to
0, then call
fwide(), then check
errno and if it is non-zero, assume
an error has occurred.
RETURN VALUES
The
fwide() function returns a value greater than 0 if, after the
call, the stream has wide-orientation, a value less than 0 if the
stream has byte-orientation, or 0 if the stream has no orientation.
ERRORS
The
fwide() function may fail if:
EBADF The
stream argument is not a valid stream.
USAGE
A call to
fwide() with
mode set to 0 can be used to determine the
current orientation of a stream.
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+
SEE ALSO
attributes(7),
standards(7) June 3, 2015 FWIDE(3C)
