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.1‐2017 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 orientation.

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.1‐2017, stdio.h(0p),

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  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.opengroup.org/unix/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               2017                         FWIDE(3P)

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