vwprintf.3c (2010 09)

vwprintf(3C) vwprintf(3C)

NAME

vfwprintf(), vwprintf(), vswprintf() - wide-character formatted output of a stdarg argument list

SYNOPSIS

#include <stdarg.h>

#include <wchar.h>

int vwprintf(const wchar_t *__restrict format, va_list arg);

int vfwprintf(FILE *__restrict stream, const wchar_t *__restrict format,

va_list arg);

int vswprintf(wchar_t *__restrict s, size_t n,

const wchar_t *__restrict format, va_list arg);

DESCRIPTION

The vwprintf(), vfwprintf() and vswprintf() functions are the same as

wprintf(),

fwprintf() and swprintf() 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 do not invoke the

va_end

macro. However, as these functions do invoke the va_arg

macro, the value of ap after the return is indeterminate.

APPLICATION USAGE

Applications using these functions should call

va_end(ap) afterwards to clean up.

The prototypes of these functions are available to applications if they are:

c99 conformant.

b. Compiled with

-D_XOPEN_SOURCE

macro with a value >=500.

c. Compiled with

-D_POSIX_C_SOURCE

macro with a value >= 200112.

RETURN VALUE

Refer to

fwprintf().

ERRORS

Refer to

fwprintf().

AUTHOR

vwprintf(), vfwprintf(), and vswprintf() were developed by HP and Mitsubishi Electric Cor-

poration.