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

void main( void )
{
    FILE    *fp;
    int     mode;

    fp = fopen( "file", "r" );
    if( fp != NULL ) {
        mode = fwide( fp, -33 );
        printf( "orientation: %s\n",
            mode > 0 ? "wide" :
            mode < 0 ? "byte" : "none" );
    }
}