makeFilterComp
char **makeFilterComp(char *filter, int *numComps);
if (filter != 0 && (fc = makeFilterComp(filter, &nfc)) != 0 &&
if (filter == 0 || (fc = makeFilterComp(filter, &nfc)) == 0 ||
ofc = makeFilterComp(filter, &nofc);
fc = makeFilterComp(filter, &nfc);