VFWPRINTF(3P) POSIX Programmer's Manual VFWPRINTF(3P)PROLOG
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
vfwprintf, vswprintf, vwprintf — wide-character formatted output of a
stdarg argument list
SYNOPSIS
#include <stdarg.h>
#include <stdio.h>
#include <wchar.h>
int vfwprintf(FILE *restrict stream, const wchar_t *restrict format,
va_list arg);
int vswprintf(wchar_t *restrict ws, size_t n,
const wchar_t *restrict format, va_list arg);
int vwprintf(const wchar_t *restrict format, va_list arg);
DESCRIPTION
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 vfwprintf(), vswprintf(), and vwprintf() functions shall be equiva‐
lent to fwprintf(), swprintf(), and wprintf() respectively, except that
instead of being called with a variable number of arguments, they are
called with an argument list as defined by <stdarg.h>.
These functions shall not invoke the va_end macro. However, as these
functions do invoke the va_arg macro, the value of ap after the return
is unspecified.
RETURN VALUE
Refer to fwprintf().
ERRORS
Refer to fwprintf().
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
Applications using these functions should call va_end(ap) afterwards to
clean up.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
Section 2.5, Standard I/O Streams, fwprintf()
The Base Definitions volume of POSIX.1‐2008, <stdarg.h>, <stdio.h>,
<wchar.h>
COPYRIGHT
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 Electri‐
cal 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.ker‐
nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 VFWPRINTF(3P)
