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
36 struct cmapnode {
37 wint_t cmn_from;
38 wint_t cmn_to;
39 struct cmapnode *cmn_left;
40 struct cmapnode *cmn_right;
41 };
42
43 struct 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
54 struct cmap * cmap_alloc(void);
55 bool cmap_add(struct cmap *, wint_t, wint_t);
56 wint_t cmap_lookup_hard(struct cmap *, wint_t);
57 void cmap_cache(struct cmap *);
58 wint_t cmap_default(struct cmap *, wint_t);
59
60 static __inline wint_t
cmap_lookup(struct cmap * cm,wint_t from)61 cmap_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
69 static __inline wint_t
cmap_min(struct cmap * cm)70 cmap_min(struct cmap *cm)
71 {
72
73 return (cm->cm_min);
74 }
75
76 static __inline wint_t
cmap_max(struct cmap * cm)77 cmap_max(struct cmap *cm)
78 {
79
80 return (cm->cm_max);
81 }
82
83 #endif
84