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hashkey.h

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                      by AT&T Knowledge Ventures                      *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Research
 *
 * 1-6 char lower-case keyword -> long hash
 * digit args passed as HASHKEYN('2')
 */

#ifndef _HASHKEY_H
#define _HASHKEY_H

#define HASHKEYMAX                  6
#define HASHKEYBIT                  5
#define HASHKEYOFF                  ('a'-1)
#define HASHKEYPART(h,c)            (((h)<<HASHKEYBIT)+HASHKEY1(c))

#define HASHKEYN(n)                 ((n)-'0'+'z'+1)

#define HASHKEY1(c1)                ((c1)-HASHKEYOFF)
#define HASHKEY2(c1,c2)             HASHKEYPART(HASHKEY1(c1),c2)
#define HASHKEY3(c1,c2,c3)          HASHKEYPART(HASHKEY2(c1,c2),c3)
#define HASHKEY4(c1,c2,c3,c4)       HASHKEYPART(HASHKEY3(c1,c2,c3),c4)
#define HASHKEY5(c1,c2,c3,c4,c5)    HASHKEYPART(HASHKEY4(c1,c2,c3,c4),c5)
#define HASHKEY6(c1,c2,c3,c4,c5,c6) HASHKEYPART(HASHKEY5(c1,c2,c3,c4,c5),c6)

#define HASHNKEY1(n,c1)             HASHKEY2((n)+HASHKEYOFF,c1)
#define HASHNKEY2(n,c2,c1)          HASHKEY3((n)+HASHKEYOFF,c2,c1)
#define HASHNKEY3(n,c3,c2,c1)       HASHKEY4((n)+HASHKEYOFF,c3,c2,c1)
#define HASHNKEY4(n,c4,c3,c2,c1)    HASHKEY5((n)+'a',c4,c3,c2,c1)
#define HASHNKEY5(n,c5,c4,c3,c2,c1) HASHKEY6((n)+'a',c5,c4,c3,c2,c1)

#if _BLD_ast && defined(__EXPORT__)
#define extern          __EXPORT__
#endif

extern long strkey(const char*);

#undef      extern

#endif

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