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[chaz/openbox] / obt / bsearch.h
1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
2
3 obt/bsearch.h for the Openbox window manager
4 Copyright (c) 2010 Dana Jansens
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 See the COPYING file for a copy of the GNU General Public License.
17 */
18
19 #ifndef __obt_bsearch_h
20 #define __obt_bsearch_h
21
22 #include <glib.h>
23
24 G_BEGIN_DECLS
25
26 /*! Setup to do a binary search on an array holding elements of type @t */
27 #define BSEARCH_SETUP(t) \
28 register t l_BSEARCH, r_BSEARCH, out_BSEARCH;
29
30 /*! Search an array @ar holding elements of type @t, starting at index @start,
31 with @size elements, looking for value @val. */
32 #define BSEARCH(t, ar, start, size, val) \
33 { \
34 l_BSEARCH = (start); \
35 r_BSEARCH = (start)+(size)-1; \
36 while (l_BSEARCH <= r_BSEARCH) { \
37 /* m is in the middle, but to the left if there's an even number \
38 of elements */ \
39 out_BSEARCH = l_BSEARCH + (r_BSEARCH - l_BSEARCH)/2; \
40 if ((val) == (ar)[out_BSEARCH]) { \
41 break; \
42 } \
43 else if ((val) < (ar)[out_BSEARCH] && out_BSEARCH > 0) { \
44 r_BSEARCH = out_BSEARCH-1; /* search to the left side */ \
45 } \
46 else \
47 l_BSEARCH = out_BSEARCH+1; /* search to the left side */ \
48 } \
49 }
50
51 /*! Returns true if the element last searched for was found in the array */
52 #define BSEARCH_FOUND() (l_BSEARCH <= r_BSEARCH)
53 /*! Returns the position in the array at which the element last searched for
54 was found. */
55 #define BSEARCH_AT() (out_BSEARCH)
56
57
58
59 G_END_DECLS
60
61 #endif
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