1VFWPRINTF(3P)              POSIX Programmer's Manual             VFWPRINTF(3P)
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PROLOG

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

12       vfwprintf, vswprintf, vwprintf — wide-character formatted output  of  a
13       stdarg argument list
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SYNOPSIS

16       #include <stdarg.h>
17       #include <stdio.h>
18       #include <wchar.h>
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20       int vfwprintf(FILE *restrict stream, const wchar_t *restrict format,
21           va_list arg);
22       int vswprintf(wchar_t *restrict ws, size_t n,
23           const wchar_t *restrict format, va_list arg);
24       int vwprintf(const wchar_t *restrict format, va_list arg);
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DESCRIPTION

27       The  functionality described on this reference page is aligned with the
28       ISO C standard. Any conflict between the  requirements  described  here
29       and  the  ISO C  standard is unintentional. This volume of POSIX.1‐2017
30       defers to the ISO C standard.
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32       The vfwprintf(), vswprintf(), and vwprintf() functions shall be equiva‐
33       lent to fwprintf(), swprintf(), and wprintf() respectively, except that
34       instead of being called with a variable number of arguments,  they  are
35       called with an argument list as defined by <stdarg.h>.
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37       These  functions  shall  not invoke the va_end macro. However, as these
38       functions do invoke the va_arg macro, the value of ap after the  return
39       is unspecified.
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RETURN VALUE

42       Refer to fwprintf().
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ERRORS

45       Refer to fwprintf().
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47       The following sections are informative.
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EXAMPLES

50       None.
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APPLICATION USAGE

53       Applications using these functions should call va_end(ap) afterwards to
54       clean up.
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RATIONALE

57       None.
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FUTURE DIRECTIONS

60       None.
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SEE ALSO

63       Section 2.5, Standard I/O Streams, fwprintf()
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65       The Base Definitions volume  of  POSIX.1‐2017,  <stdarg.h>,  <stdio.h>,
66       <wchar.h>
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69       Portions  of  this text are reprinted and reproduced in electronic form
70       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
71       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
72       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
73       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
74       event of any discrepancy between this version and the original IEEE and
75       The  Open Group Standard, the original IEEE and The Open Group Standard
76       is the referee document. The original Standard can be  obtained  online
77       at http://www.opengroup.org/unix/online.html .
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79       Any  typographical  or  formatting  errors that appear in this page are
80       most likely to have been introduced during the conversion of the source
81       files  to  man page format. To report such errors, see https://www.ker‐
82       nel.org/doc/man-pages/reporting_bugs.html .
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86IEEE/The Open Group                  2017                        VFWPRINTF(3P)
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