DOS_FILE
DOS_FILE *df;
DOS_FILE *f;
if ((f = calloc(1, sizeof(DOS_FILE))) == NULL) {
DOS_FILE *f = (DOS_FILE *)fd->f_fsdata;
DOS_FILE *f = (DOS_FILE *)fd->f_fsdata;
DOS_FILE *f = (DOS_FILE *)fd->f_fsdata;
DOS_FILE *f = (DOS_FILE *)fd->f_fsdata;