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)