1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2004 Tim J. Robbins.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef CMAP_H
30#define	CMAP_H
31
32#include <limits.h>
33#include <stdbool.h>
34#include <wchar.h>
35
36struct cmapnode {
37	wint_t		cmn_from;
38	wint_t		cmn_to;
39	struct cmapnode	*cmn_left;
40	struct cmapnode	*cmn_right;
41};
42
43struct cmap {
44#define	CM_CACHE_SIZE	128
45	wint_t		cm_cache[CM_CACHE_SIZE];
46	bool		cm_havecache;
47	struct cmapnode	*cm_root;
48#define	CM_DEF_SELF	-2
49	wint_t		cm_def;
50	wint_t		cm_min;
51	wint_t		cm_max;
52};
53
54struct cmap *	cmap_alloc(void);
55bool		cmap_add(struct cmap *, wint_t, wint_t);
56wint_t		cmap_lookup_hard(struct cmap *, wint_t);
57void		cmap_cache(struct cmap *);
58wint_t		cmap_default(struct cmap *, wint_t);
59
60static __inline wint_t
61cmap_lookup(struct cmap *cm, wint_t from)
62{
63
64	if (from < CM_CACHE_SIZE && cm->cm_havecache)
65		return (cm->cm_cache[from]);
66	return (cmap_lookup_hard(cm, from));
67}
68
69static __inline wint_t
70cmap_min(struct cmap *cm)
71{
72
73	return (cm->cm_min);
74}
75
76static __inline wint_t
77cmap_max(struct cmap *cm)
78{
79
80	return (cm->cm_max);
81}
82
83#endif
84