385 	np->n_alink = NNULL;  in emptynode()
450 	while (np != NNULL) {  in vlookup()
456 		np = NNULL;  in vlookup()
503 	prevp = NNULL;  in delsymtab()
504 	for (rnp = symtab[h]; rnp != NNULL; rnp = rnp->n_next) {  in delsymtab()
520 			if (prevp == NNULL)  in delsymtab()
566 	while (wp != NNULL) {  in execute()
572 			wp = NNULL;  in execute()
583 		if (np == NNULL) {  in execute()
613 	if (freelist != NNULL)  in execute()
635 	for (np = freelist; np != NNULL; np = nnp) {  in freetemps()
639 	freelist = NNULL;  in freetemps()
653 	while (wp != NNULL) {  in action()
659 			wp = NNULL;  in action()
661 		if (freelist != NNULL)  in action()
683 			if (np->n_left != NNULL)  in action()
692 			np = np->n_left != NNULL  in action()
735 				while (np != NNULL) {  in action()
800 	np->n_alink = NNULL;  in delarray()
801 	while (nnp != NNULL) {  in delarray()
1057 				if (tnp->n_alink != NNULL) {  in exprreduce()
1070 			if (np == NNULL || np->n_type == COMMA)  in exprreduce()
1085 			np = vlookup(cp, 1) == NNULL ? const0 : const1;  in exprreduce()
1676 	if ((fnp = np->n_left) == NNULL)  in userfunc()
1697 		templist = temptail = NNULL;  in userfunc()
1707 		while ((formal = getlist(&formlist)) != NNULL) {  in userfunc()
1714 			if (actual == NNULL) {  in userfunc()
1758 			if (templist != NNULL) {  in userfunc()
1763 			temp->n_next = NNULL;  in userfunc()
1773 		while (templist != NNULL) {  in userfunc()
1803 		while ((formal = getlist(&formlist)) != NNULL) {  in userfunc()
1836 	if ((np = *npp) == NNULL)  in getlist()
1842 		*npp = NNULL;  in getlist()
1911 	if (initnp != NNULL)  in s_for()
1929 		if (incnp != NNULL)  in s_for()
1965 		np = NNULL;  in s_forin()
1980 				if (np->n_alink != NNULL)  in s_forin()
2014 			if ((left = symwalk(&nbuck, &np)) == NNULL)  in s_forin()
2018 			if ((np = *nnp) == NNULL)  in s_forin()
2051 		while (np == NNULL) {  in symwalk()
2053 				return (*npp = NNULL);  in symwalk()
2074 	if (np == NNULL)  in exprtest()
2076 	if (freelist != NNULL)  in exprtest()
2153 	while ((index = getlist(&np)) != NNULL) {  in makeindex()
2187 	register NODE *prev = NNULL;  in promote()
2210 		n->n_alink = NNULL;  in promote()
2217 	while (prev != NNULL) {  in promote()