#7 arcmisc.c:131]: (error) Resource leak: old

[dcb]

Source code is

    old = fopen(oldnam, OPEN_R);
    if (old == NULL)
        return (-1);
    new = fopen(newnam, OPEN_W);
    if (new == NULL)
        return (-1);

Suggest add missing call to fclose( old) in final if.