The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### 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

> [CX] 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 equivalent 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

> Standard I/O Streams, fwprintf

> XBD <stdarg.h>, <stdio.h>, <wchar.h>

#### CHANGE HISTORY

> First released in Issue 5. Included for alignment with ISO/IEC 9899:1990/Amendment 1:1995 (E).

#### Issue 6

> The vfwprintf(), vswprintf(), and vwprintf() prototypes are updated for alignment with the ISO/IEC 9899:1999 standard.

#### Issue 7

> POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0705 [14] is applied.

End of informative text.

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