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 * 1-6 char lower-case keyword -> long hash
28 * digit args passed as HASHKEYN('2')
29 */
30
31#ifndef _HASHKEY_H
32#define _HASHKEY_H
33
34#define HASHKEYMAX			6
35#define HASHKEYBIT			5
36#define HASHKEYOFF			('a'-1)
37#define HASHKEYPART(h,c)		(((h)<<HASHKEYBIT)+HASHKEY1(c))
38
39#define HASHKEYN(n)			((n)-'0'+'z'+1)
40
41#define HASHKEY1(c1)			((c1)-HASHKEYOFF)
42#define HASHKEY2(c1,c2)			HASHKEYPART(HASHKEY1(c1),c2)
43#define HASHKEY3(c1,c2,c3)		HASHKEYPART(HASHKEY2(c1,c2),c3)
44#define HASHKEY4(c1,c2,c3,c4)		HASHKEYPART(HASHKEY3(c1,c2,c3),c4)
45#define HASHKEY5(c1,c2,c3,c4,c5)	HASHKEYPART(HASHKEY4(c1,c2,c3,c4),c5)
46#define HASHKEY6(c1,c2,c3,c4,c5,c6)	HASHKEYPART(HASHKEY5(c1,c2,c3,c4,c5),c6)
47
48#define HASHNKEY1(n,c1)			HASHKEY2((n)+HASHKEYOFF,c1)
49#define HASHNKEY2(n,c2,c1)		HASHKEY3((n)+HASHKEYOFF,c2,c1)
50#define HASHNKEY3(n,c3,c2,c1)		HASHKEY4((n)+HASHKEYOFF,c3,c2,c1)
51#define HASHNKEY4(n,c4,c3,c2,c1)	HASHKEY5((n)+'a',c4,c3,c2,c1)
52#define HASHNKEY5(n,c5,c4,c3,c2,c1)	HASHKEY6((n)+'a',c5,c4,c3,c2,c1)
53
54#if _BLD_ast && defined(__EXPORT__)
55#define extern		__EXPORT__
56#endif
57
58extern long	strkey(const char*);
59
60#undef	extern
61
62#endif
63