hashkey.h revision 3f54fd611f536639ec30dd53c48e5ec1897cc7d9
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2012 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* 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> *
* *
***********************************************************************/
/*
* 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 1
#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