Sindbad~EG File Manager

typedef struct
{
    long left;
    long top;
    long right;
    long bottom;
} BIGRECT;

void CopyBigRect(BIGRECT *ans, BIGRECT *r);
void SetBigRect(BIGRECT *ans, long left, long top, long right, long bottom);
int UnionBigRect(BIGRECT *ans, const BIGRECT *r, const BIGRECT *s);
void SetBigRectEmpty( BIGRECT *r);