while (i > 0 && bc != NULL) {
    bc = *((char **) bc);
    i--;
    }
    if (bc != NULL) {
    char *fb;

    fb = *((char **) bc);
    if (fb != NULL) {
        *((char **) bc) = *((char **) fb);
        brel((void *) fb);
        return 1;
    }
    }