xref: /freebsd/usr.bin/tr/cmap.h (revision 6829dae12bb055451fa467da4589c43bd03b1e64)
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
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
72 cmap_min(struct cmap *cm)
73 {
74 
75 	return (cm->cm_min);
76 }
77 
78 static __inline wint_t
79 cmap_max(struct cmap *cm)
80 {
81 
82 	return (cm->cm_max);
83 }
84 
85 #endif
86