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fwide(3C)

HP-UX 11i Version 3: February 2007
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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 zero, the function first attempts to make the stream wide-oriented. If mode is less than zero, the function first attempts to make the stream byte-oriented. Otherwise, mode is zero 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.

APPLICATION USAGE

A call to fwide() with mode set to 0 can be used to determine the current orientation of a stream.

The prototype of this function is available to applications if they are:

a.

c99 conformant.

b.

Compiled with -D_XOPEN_SOURCE macro with a value >=500.

c.

Compiled with -D_POSIX_C_SOURCE macro with a value >= 200112.

RETURN VALUE

The fwide() function returns a value greater than zero if, after the call, the stream has wide-orientation, a value less than zero if the stream has byte-orientation, or zero if the stream has no orientation.

ERRORS

The fwide() function may fail if:

EBADF

The stream argument is not a valid stream.

AUTHOR

fwide() was developed by HP and Mitsubishi Electric Corporation.

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