1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                 Eclipse Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*          http://www.eclipse.org/org/documents/epl-v10.html           *
11*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#pragma prototyped
23/*
24 * Glenn Fowler
25 * AT&T Research
26 */
27
28#include <ast.h>
29
30/*
31 * return a pointer to the element matching
32 * name in the (*comparf*)() sorted tab of num elements of
33 * size siz where the first member of each
34 * element is a char*
35 *
36 * 0 returned if name not found
37 */
38
39void*
40strsearch(const void* tab, size_t num, size_t siz, Strcmp_f comparf, const char* name, void* context)
41{
42	register char*		lo = (char*)tab;
43	register char*		hi = lo + (num - 1) * siz;
44	register char*		mid;
45	register int		v;
46
47	while (lo <= hi)
48	{
49		mid = lo + (((hi - lo) / siz) / 2) * siz;
50		if (!(v = context ? (*(Strcmp_context_f)comparf)(name, *((char**)mid), context) : (*comparf)(name, *((char**)mid))))
51			return (void*)mid;
52		else if (v > 0)
53			lo = mid + siz;
54		else hi = mid - siz;
55	}
56	return 0;
57}
58