1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2010 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 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 58 extern long strkey(const char*); 59 60 #undef extern 61 62 #endif 63