xref: /freebsd/usr.bin/tr/cmap.h (revision a03411e84728e9b267056fd31c7d1d9d1dc1b01e)
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
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
70 cmap_min(struct cmap *cm)
71 {
72 
73 	return (cm->cm_min);
74 }
75 
76 static __inline wint_t
77 cmap_max(struct cmap *cm)
78 {
79 
80 	return (cm->cm_max);
81 }
82 
83 #endif
84