2.11BSD/ingres/source/decomp/mklist.c

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# include	"../ingres.h"
# include	"../tree.h"
# include	"../symbol.h"
# include	"decomp.h"

/*
**	mklist
**
**	writes a list of query tree nodes in "OVQP order" --
**	that is, everything in postfix (endorder) except AND's and OR's
**	infixed (postorder) to OVQP.
**	called by call_ovqp().
*/



mklist(tree)
struct querytree *tree;
{
	register int			typ;
	register struct querytree 	*t;
	register int 			andor;

	t = tree;
	if (!t || (typ=t->sym.type)==TREE || typ==QLEND) 
		return;

	andor=0;
	mklist(t->left);
	if (typ==AND || typ==OR)
	{
		andor = 1;
		ovqpnod(t);
	}
	mklist(t->right);
	if (!andor)
		ovqpnod(t);
}