fwide(3p) — Linux manual page


FWIDE(3P)                 POSIX Programmer's Manual                FWIDE(3P)

PROLOG         top

       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior), or
       the interface may not be implemented on Linux.

NAME         top

       fwide — set stream orientation

SYNOPSIS         top

       #include <stdio.h>
       #include <wchar.h>

       int fwide(FILE *stream, int mode);

DESCRIPTION         top

       The functionality described on this reference page is aligned with
       the ISO C standard. Any conflict between the requirements described
       here and the ISO C standard is unintentional. This volume of
       POSIX.1‐2008 defers to the ISO C standard.

       The fwide() function shall determine 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()
       shall not change it.

       The fwide() function shall not change the setting of errno if

       Since 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 VALUE         top

       The fwide() function shall return 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

ERRORS         top

       The fwide() function may fail if:

       EBADF  The stream argument is not a valid stream.

       The following sections are informative.

EXAMPLES         top



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

RATIONALE         top




SEE ALSO         top

       The Base Definitions volume of POSIX.1‐2008, stdio.h(0p), wchar.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) In the event of any discrepancy between this version and
       the original IEEE and The Open Group Standard, the original IEEE and
       The Open Group Standard is the referee document. The original
       Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013                           FWIDE(3P)

Pages that refer to this page: wchar.h(0p)