1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 * $FreeBSD$
29 */
30
31#ifndef CMAP_H
32#define	CMAP_H
33
34#include <limits.h>
35#include <stdbool.h>
36#include <wchar.h>
37
38struct cmapnode {
39	wint_t		cmn_from;
40	wint_t		cmn_to;
41	struct cmapnode	*cmn_left;
42	struct cmapnode	*cmn_right;
43};
44
45struct cmap {
46#define	CM_CACHE_SIZE	128
47	wint_t		cm_cache[CM_CACHE_SIZE];
48	bool		cm_havecache;
49	struct cmapnode	*cm_root;
50#define	CM_DEF_SELF	-2
51	wint_t		cm_def;
52	wint_t		cm_min;
53	wint_t		cm_max;
54};
55
56struct cmap *	cmap_alloc(void);
57bool		cmap_add(struct cmap *, wint_t, wint_t);
58wint_t		cmap_lookup_hard(struct cmap *, wint_t);
59void		cmap_cache(struct cmap *);
60wint_t		cmap_default(struct cmap *, wint_t);
61
62static __inline wint_t
63cmap_lookup(struct cmap *cm, wint_t from)
64{
65
66	if (from < CM_CACHE_SIZE && cm->cm_havecache)
67		return (cm->cm_cache[from]);
68	return (cmap_lookup_hard(cm, from));
69}
70
71static __inline wint_t
72cmap_min(struct cmap *cm)
73{
74
75	return (cm->cm_min);
76}
77
78static __inline wint_t
79cmap_max(struct cmap *cm)
80{
81
82	return (cm->cm_max);
83}
84
85#endif
86