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.

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