387 	np->n_alink = NNULL;  in emptynode()
452 	while (np != NNULL) {  in vlookup()
458 		np = NNULL;  in vlookup()
505 	prevp = NNULL;  in delsymtab()
506 	for (rnp = symtab[h]; rnp != NNULL; rnp = rnp->n_next) {  in delsymtab()
522 			if (prevp == NNULL)  in delsymtab()
568 	while (wp != NNULL) {  in execute()
574 			wp = NNULL;  in execute()
585 		if (np == NNULL) {  in execute()
615 	if (freelist != NNULL)  in execute()
637 	for (np = freelist; np != NNULL; np = nnp) {  in freetemps()
641 	freelist = NNULL;  in freetemps()
655 	while (wp != NNULL) {  in action()
661 			wp = NNULL;  in action()
663 		if (freelist != NNULL)  in action()
685 			if (np->n_left != NNULL)  in action()
694 			np = np->n_left != NNULL  in action()
737 				while (np != NNULL) {  in action()
801 	np->n_alink = NNULL;  in delarray()
802 	while (nnp != NNULL) {  in delarray()
1058 				if (tnp->n_alink != NNULL) {  in exprreduce()
1071 			if (np == NNULL || np->n_type == COMMA)  in exprreduce()
1086 			np = vlookup(cp, 1) == NNULL ? const0 : const1;  in exprreduce()
1679 	if ((fnp = np->n_left) == NNULL)  in userfunc()
1700 		templist = temptail = NNULL;  in userfunc()
1710 		while ((formal = getlist(&formlist)) != NNULL) {  in userfunc()
1717 			if (actual == NNULL) {  in userfunc()
1761 			if (templist != NNULL) {  in userfunc()
1766 			temp->n_next = NNULL;  in userfunc()
1776 		while (templist != NNULL) {  in userfunc()
1806 		while ((formal = getlist(&formlist)) != NNULL) {  in userfunc()
1839 	if ((np = *npp) == NNULL)  in getlist()
1845 		*npp = NNULL;  in getlist()
1914 	if (initnp != NNULL)  in s_for()
1932 		if (incnp != NNULL)  in s_for()
1968 		np = NNULL;  in s_forin()
1983 				if (np->n_alink != NNULL)  in s_forin()
2017 			if ((left = symwalk(&nbuck, &np)) == NNULL)  in s_forin()
2021 			if ((np = *nnp) == NNULL)  in s_forin()
2054 		while (np == NNULL) {  in symwalk()
2056 				return (*npp = NNULL);  in symwalk()
2077 	if (np == NNULL)  in exprtest()
2079 	if (freelist != NNULL)  in exprtest()
2156 	while ((index = getlist(&np)) != NNULL) {  in makeindex()
2190 	register NODE *prev = NNULL;  in promote()
2213 		n->n_alink = NNULL;  in promote()
2220 	while (prev != NNULL) {  in promote()