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/* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
obt/bsearch.h for the Openbox window manager
Copyright (c) 2010 Dana Jansens
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
See the COPYING file for a copy of the GNU General Public License.
*/
#ifndef __obt_bsearch_h
#define __obt_bsearch_h
#include <glib.h>
G_BEGIN_DECLS
/*! Setup to do a binary search on an array holding elements of type @t */
#define BSEARCH_SETUP(t) \
register t l_BSEARCH, r_BSEARCH, out_BSEARCH;
/*! Search an array @ar holding elements of type @t, starting at index @start,
with @size elements, looking for value @val. */
#define BSEARCH(t, ar, start, size, val) \
{ \
l_BSEARCH = (start); \
r_BSEARCH = (start)+(size)-1; \
while (l_BSEARCH <= r_BSEARCH) { \
/* m is in the middle, but to the left if there's an even number \
of elements */ \
out_BSEARCH = l_BSEARCH + (r_BSEARCH - l_BSEARCH)/2; \
if ((val) == (ar)[out_BSEARCH]) { \
break; \
} \
else if ((val) < (ar)[out_BSEARCH] && out_BSEARCH > 0) { \
r_BSEARCH = out_BSEARCH-1; /* search to the left side */ \
} \
else \
l_BSEARCH = out_BSEARCH+1; /* search to the left side */ \
} \
}
/*! Returns true if the element last searched for was found in the array */
#define BSEARCH_FOUND() (l_BSEARCH <= r_BSEARCH)
/*! Returns the position in the array at which the element last searched for
was found. */
#define BSEARCH_AT() (out_BSEARCH)
G_END_DECLS
#endif
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