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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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FWIDE(3P) POSIX Programmer's Manual FWIDE(3P)
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.
fwide — set stream orientation
#include <stdio.h>
#include <wchar.h>
int fwide(FILE *stream, int mode);
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
successful.
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.
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.
The fwide() function may fail if:
EBADF The stream argument is not a valid stream.
The following sections are informative.
None.
A call to fwide() with mode set to zero can be used to determine
the current orientation of a stream.
None.
None.
The Base Definitions volume of POSIX.1‐2017, stdio.h(0p),
wchar.h(0p)
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)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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