wchar_t vs wint_t

This is an ANSI C question. I have the following code.

#include <stdio.h>
#include <locale.h>
#include <wchar.h>

  int main()
  {
    if (!setlocale(LC_CTYPE, "")) {
      printf( "Can't set the specified locale! "
              "Check LANG, LC_CTYPE, LC_ALL.\n");
      return -1;
    }
    wint_t c;
    while((c=getwc(stdin))!=WEOF)
      {
    printf("%lc",c);
      }
    return 0;
  }

I need full UTF-8 support, but even at this simplest level, can I improve this somehow? Why is wint_t used, and not wchar, with appropriate changes?