4.72 vfwprintf, vwprintf, vswprintf—wide character format argument list

Synopsis

#include <stdio.h>
#include <stdarg.h>
#include <wchar.h>
int vwprintf(const wchar_t *__restrict fmt, va_list list);
int vfwprintf(FILE *__restrict fp,
    const wchar_t *__restrict fmt, va_list list);
int vswprintf(wchar_t * __restrict str, size_t size,
    const wchar_t *__ restrict fmt, va_list list);

int _vwprintf_r(struct _reent *reent, const wchar_t *fmt,
    va_list list);
int _vfwprintf_r(struct _reent *reent, FILE *fp,
    const wchar_t *fmt, va_list list);
int _vswprintf_r(struct _reent *reent, wchar_t *str,
    size_t size, const wchar_t *fmt, va_list list);

Description
vwprintf, vfwprintf and vswprintf are (respectively) variants of wprintf, fwprintf and swprintf. They differ only in allowing their caller to pass the variable argument list as a va_list object (initialized by va_start) rather than directly accepting a variable number of arguments. The caller is responsible for calling va_end.

_vwprintf_r, _vfwprintf_r and _vswprintf_r are reentrant versions of the above.

Returns
The return values are consistent with the corresponding functions.

Portability
POSIX-1.2008 with extensions; C99 (compliant except for POSIX extensions).

Supporting OS subroutines required: close, fstat, isatty, lseek, read, sbrk, write.

See Also
wprintf, fwprintf and swprintf.