GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/find/operator.c Lines: 41 73 56.2 %
Date: 2017-11-13 Branches: 26 54 48.1 %

Line Branch Exec Source
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/*	$OpenBSD: operator.c,v 1.10 2009/10/27 23:59:38 deraadt Exp $	*/
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/*-
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 * Copyright (c) 1990, 1993
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 *	The Regents of the University of California.  All rights reserved.
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 *
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 * This code is derived from software contributed to Berkeley by
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 * Cimarron D. Taylor of the University of California, Berkeley.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <fts.h>
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#include <stdio.h>
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#include "find.h"
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#include "extern.h"
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/*
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 * yanknode --
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 *	destructively removes the top from the plan
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 */
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static PLAN *
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yanknode(PLAN **planp)		/* pointer to top of plan (modified) */
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{
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	PLAN *node;		/* top node removed from the plan */
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	if ((node = (*planp)) == NULL)
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		return (NULL);
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	(*planp) = (*planp)->next;
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	node->next = NULL;
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	return (node);
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}
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/*
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 * yankexpr --
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 *	Removes one expression from the plan.  This is used mainly by
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 *	paren_squish.  In comments below, an expression is either a
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 *	simple node or a N_EXPR node containing a list of simple nodes.
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 */
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static PLAN *
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yankexpr(PLAN **planp)		/* pointer to top of plan (modified) */
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{
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	PLAN *next;	/* temp node holding subexpression results */
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	PLAN *node;		/* pointer to returned node or expression */
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	PLAN *tail;		/* pointer to tail of subplan */
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	PLAN *subplan;		/* pointer to head of ( ) expression */
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	extern int f_expr(PLAN *, FTSENT *);
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	/* first pull the top node from the plan */
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	if ((node = yanknode(planp)) == NULL)
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		return (NULL);
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	/*
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	 * If the node is an '(' then we recursively slurp up expressions
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	 * until we find its associated ')'.  If it's a closing paren we
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	 * just return it and unwind our recursion; all other nodes are
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	 * complete expressions, so just return them.
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	 */
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	if (node->type == N_OPENPAREN)
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		for (tail = subplan = NULL;;) {
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			if ((next = yankexpr(planp)) == NULL)
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				errx(1, "(: missing closing ')'");
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			/*
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			 * If we find a closing ')' we store the collected
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			 * subplan in our '(' node and convert the node to
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			 * a N_EXPR.  The ')' we found is ignored.  Otherwise,
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			 * we just continue to add whatever we get to our
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			 * subplan.
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			 */
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			if (next->type == N_CLOSEPAREN) {
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				if (subplan == NULL)
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					errx(1, "(): empty inner expression");
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				node->p_data[0] = subplan;
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				node->type = N_EXPR;
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				node->eval = f_expr;
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				break;
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			} else {
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				if (subplan == NULL)
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					tail = subplan = next;
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				else {
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					tail->next = next;
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					tail = next;
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				}
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				tail->next = NULL;
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			}
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		}
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	return (node);
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}
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/*
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 * paren_squish --
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 *	replaces "parentheisized" plans in our search plan with "expr" nodes.
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 */
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PLAN *
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paren_squish(PLAN *plan)		/* plan with ( ) nodes */
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{
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	PLAN *expr;	/* pointer to next expression */
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	PLAN *tail;	/* pointer to tail of result plan */
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	PLAN *result;		/* pointer to head of result plan */
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	result = tail = NULL;
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	/*
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	 * the basic idea is to have yankexpr do all our work and just
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	 * collect it's results together.
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	 */
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	while ((expr = yankexpr(&plan)) != NULL) {
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		/*
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		 * if we find an unclaimed ')' it means there is a missing
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		 * '(' someplace.
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		 */
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		if (expr->type == N_CLOSEPAREN)
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			errx(1, "): no beginning '('");
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		/* add the expression to our result plan */
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		if (result == NULL)
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			tail = result = expr;
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		else {
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			tail->next = expr;
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			tail = expr;
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		}
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		tail->next = NULL;
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	}
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	return (result);
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}
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/*
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 * not_squish --
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 *	compresses "!" expressions in our search plan.
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 */
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PLAN *
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not_squish(PLAN *plan)		/* plan to process */
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{
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	PLAN *next;	/* next node being processed */
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	PLAN *node;	/* temporary node used in N_NOT processing */
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	PLAN *tail;	/* pointer to tail of result plan */
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	PLAN *result;		/* pointer to head of result plan */
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	tail = result = next = NULL;
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	while ((next = yanknode(&plan)) != NULL) {
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		/*
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		 * if we encounter a ( expression ) then look for nots in
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		 * the expr subplan.
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		 */
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		if (next->type == N_EXPR)
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			next->p_data[0] = not_squish(next->p_data[0]);
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		/*
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		 * if we encounter a not, then snag the next node and place
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		 * it in the not's subplan.  As an optimization we compress
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		 * several not's to zero or one not.
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		 */
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		if (next->type == N_NOT) {
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			int notlevel = 1;
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			node = yanknode(&plan);
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			while (node != NULL && node->type == N_NOT) {
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				++notlevel;
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				node = yanknode(&plan);
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			}
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			if (node == NULL)
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				errx(1, "!: no following expression");
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			if (node->type == N_OR)
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				errx(1, "!: nothing between ! and -o");
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			if (node->type == N_EXPR)
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				node = not_squish(node);
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			if (notlevel % 2 != 1)
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				next = node;
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			else
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				next->p_data[0] = node;
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		}
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		/* add the node to our result plan */
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		if (result == NULL)
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			tail = result = next;
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		else {
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			tail->next = next;
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			tail = next;
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		}
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		tail->next = NULL;
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	}
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	return (result);
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}
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/*
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 * or_squish --
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 *	compresses -o expressions in our search plan.
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 */
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PLAN *
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or_squish(PLAN *plan)		/* plan with ors to be squished */
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{
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	PLAN *next;	/* next node being processed */
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	PLAN *tail;	/* pointer to tail of result plan */
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	PLAN *result;		/* pointer to head of result plan */
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	tail = result = next = NULL;
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	while ((next = yanknode(&plan)) != NULL) {
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		/*
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		 * if we encounter a ( expression ) then look for or's in
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		 * the expr subplan.
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		 */
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		if (next->type == N_EXPR)
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			next->p_data[0] = or_squish(next->p_data[0]);
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		/* if we encounter a not then look for not's in the subplan */
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		if (next->type == N_NOT)
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			next->p_data[0] = or_squish(next->p_data[0]);
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		/*
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		 * if we encounter an or, then place our collected plan in the
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		 * or's first subplan and then recursively collect the
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		 * remaining stuff into the second subplan and return the or.
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		 */
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		if (next->type == N_OR) {
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			if (result == NULL)
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				errx(1, "-o: no expression before -o");
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			next->p_data[0] = result;
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			next->p_data[1] = or_squish(plan);
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			if (next->p_data[1] == NULL)
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				errx(1, "-o: no expression after -o");
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			return (next);
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		}
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		/* add the node to our result plan */
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		if (result == NULL)
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			tail = result = next;
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		else {
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			tail->next = next;
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			tail = next;
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		}
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		tail->next = NULL;
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	}
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	return (result);
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}