/*-
 * Copyright (c) 1991, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Cimarron D. Taylor of the University of California, Berkeley.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)find.c	8.5 (Berkeley) 08/05/94";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>

#include <err.h>
#include <errno.h>
#include <fts.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "find.h"

/*
 * find_formplan --
 *	process the command line and create a "plan" corresponding to the
 *	command arguments.
 */
PLAN *
find_formplan(argv)
	char **argv;
{
	PLAN *plan, *tail, *new;

	/*
	 * for each argument in the command line, determine what kind of node
	 * it is, create the appropriate node type and add the new plan node
	 * to the end of the existing plan.  The resulting plan is a linked
	 * list of plan nodes.  For example, the string:
	 *
	 *	% find . -name foo -newer bar -print
	 *
	 * results in the plan:
	 *
	 *	[-name foo]--> [-newer bar]--> [-print]
	 *
	 * in this diagram, `[-name foo]' represents the plan node generated
	 * by c_name() with an argument of foo and `-->' represents the
	 * plan->next pointer.
	 */
	for (plan = tail = NULL; *argv;) {
		if (!(new = find_create(&argv)))
			continue;
		if (plan == NULL)
			tail = plan = new;
		else {
			tail->next = new;
			tail = new;
		}
	}
    
	/*
	 * if the user didn't specify one of -print, -ok or -exec, then -print
	 * is assumed so we bracket the current expression with parens, if
	 * necessary, and add a -print node on the end.
	 */
	if (!isoutput) {
		if (plan == NULL) {
			new = c_print();
			tail = plan = new;
		} else {
			new = c_openparen();
			new->next = plan;
			plan = new;
			new = c_closeparen();
			tail->next = new;
			tail = new;
			new = c_print();
			tail->next = new;
			tail = new;
		}
	}
    
	/*
	 * the command line has been completely processed into a search plan
	 * except for the (, ), !, and -o operators.  Rearrange the plan so
	 * that the portions of the plan which are affected by the operators
	 * are moved into operator nodes themselves.  For example:
	 *
	 *	[!]--> [-name foo]--> [-print]
	 *
	 * becomes
	 *
	 *	[! [-name foo] ]--> [-print]
	 *
	 * and
	 *
	 *	[(]--> [-depth]--> [-name foo]--> [)]--> [-print]
	 *
	 * becomes
	 *
	 *	[expr [-depth]-->[-name foo] ]--> [-print]
	 *
	 * operators are handled in order of precedence.
	 */

	plan = paren_squish(plan);		/* ()'s */
	plan = not_squish(plan);		/* !'s */
	plan = or_squish(plan);			/* -o's */
	return (plan);
}
 
FTS *tree;			/* pointer to top of FTS hierarchy */

/*
 * find_execute --
 *	take a search plan and an array of search paths and executes the plan
 *	over all FTSENT's returned for the given search paths.
 */
int
find_execute(plan, paths)
	PLAN *plan;		/* search plan */
	char **paths;		/* array of pathnames to traverse */
{
	register FTSENT *entry;
	PLAN *p;
	int rval;
    
	if ((tree = fts_open(paths, ftsoptions, (int (*)())NULL)) == NULL)
		err(1, "ftsopen");

	for (rval = 0; (entry = fts_read(tree)) != NULL;) {
		switch (entry->fts_info) {
		case FTS_D:
			if (isdepth)
				continue;
			break;
		case FTS_DP:
			if (!isdepth)
				continue;
			break;
		case FTS_DNR:
		case FTS_ERR:
		case FTS_NS:
			(void)fflush(stdout);
			warnx("%s: %s",
			    entry->fts_path, strerror(entry->fts_errno));
			rval = 1;
			continue;
#ifdef FTS_W
		case FTS_W:
			continue;
#endif /* FTS_W */
		}
#define	BADCH	" \t\n\\'\""
		if (isxargs && strpbrk(entry->fts_path, BADCH)) {
			(void)fflush(stdout);
			warnx("%s: illegal path", entry->fts_path);
			rval = 1;
			continue;
		}
		 
		/*
		 * Call all the functions in the execution plan until one is
		 * false or all have been executed.  This is where we do all
		 * the work specified by the user on the command line.
		 */
		for (p = plan; p && (p->eval)(p, entry); p = p->next);
	}
	if (errno)
		err(1, "fts_read");
	return (rval);
}