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Revision 1.2, Wed Feb 5 20:13:58 2014 UTC (10 years, 4 months ago) by syl
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1, OPENBSD_7_0_BASE, OPENBSD_7_0, OPENBSD_6_9_BASE, OPENBSD_6_9, OPENBSD_6_8_BASE, OPENBSD_6_8, OPENBSD_6_7_BASE, OPENBSD_6_7, OPENBSD_6_6_BASE, OPENBSD_6_6, OPENBSD_6_5_BASE, OPENBSD_6_5, OPENBSD_6_4_BASE, OPENBSD_6_4, OPENBSD_6_3_BASE, OPENBSD_6_3, OPENBSD_6_2_BASE, OPENBSD_6_2, OPENBSD_6_1_BASE, OPENBSD_6_1, OPENBSD_6_0_BASE, OPENBSD_6_0, OPENBSD_5_9_BASE, OPENBSD_5_9, OPENBSD_5_8_BASE, OPENBSD_5_8, OPENBSD_5_7_BASE, OPENBSD_5_7, OPENBSD_5_6_BASE, OPENBSD_5_6, OPENBSD_5_5_BASE, OPENBSD_5_5, HEAD
Changes since 1.1: +5 -2 lines 

check return values in libfuse.

inputs from stsp@.
ok stsp@.

/*	$OpenBSD: tree.c,v 1.2 2014/02/05 20:13:58 syl Exp $	*/

/*
 * Copyright (c) 2012 Eric Faurot <eric@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <stdlib.h>
#include <errno.h>

#include "fuse_private.h"

struct treeentry {
	SPLAY_ENTRY(treeentry)	 entry;
	uint64_t		 id;
	void			*data;
};

static int treeentry_cmp(struct treeentry *, struct treeentry *);

SPLAY_PROTOTYPE(tree, treeentry, entry, treeentry_cmp);

int
tree_check(struct tree *t, uint64_t id)
{
	struct treeentry	key;

	key.id = id;
	return (SPLAY_FIND(tree, t, &key) != NULL);
}

void *
tree_set(struct tree *t, uint64_t id, void *data)
{
	struct treeentry	*entry, key;

	key.id = id;
	if ((entry = SPLAY_FIND(tree, t, &key)) == NULL) {
		entry = malloc(sizeof *entry);
		if (entry == NULL)
			return (NULL);
		entry->id = id;
		SPLAY_INSERT(tree, t, entry);
	}

	entry->data = data;

	return (entry);
}

void *
tree_get(struct tree *t, uint64_t id)
{
	struct treeentry	key, *entry;

	key.id = id;
	if ((entry = SPLAY_FIND(tree, t, &key)) == NULL) {
		errno = ENOENT;
		return (NULL);
	}

	return (entry->data);
}

void *
tree_pop(struct tree *t, uint64_t id)
{
	struct treeentry	key, *entry;
	void			*data;

	key.id = id;
	if ((entry = SPLAY_FIND(tree, t, &key)) == NULL)
		return (NULL);

	data = entry->data;
	SPLAY_REMOVE(tree, t, entry);
	free(entry);

	return (data);
}

static int
treeentry_cmp(struct treeentry *a, struct treeentry *b)
{
	if (a->id < b->id)
		return (-1);
	if (a->id > b->id)
		return (1);
	return (0);
}

SPLAY_GENERATE(tree, treeentry, entry, treeentry_cmp);