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

Synopsis

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