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
38 struct cmapnode {
39 wint_t cmn_from;
40 wint_t cmn_to;
41 struct cmapnode *cmn_left;
42 struct cmapnode *cmn_right;
43 };
44
45 struct 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
56 struct cmap * cmap_alloc(void);
57 bool cmap_add(struct cmap *, wint_t, wint_t);
58 wint_t cmap_lookup_hard(struct cmap *, wint_t);
59 void cmap_cache(struct cmap *);
60 wint_t cmap_default(struct cmap *, wint_t);
61
62 static __inline wint_t
cmap_lookup(struct cmap * cm,wint_t from)63 cmap_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
71 static __inline wint_t
cmap_min(struct cmap * cm)72 cmap_min(struct cmap *cm)
73 {
74
75 return (cm->cm_min);
76 }
77
78 static __inline wint_t
cmap_max(struct cmap * cm)79 cmap_max(struct cmap *cm)
80 {
81
82 return (cm->cm_max);
83 }
84
85 #endif
86