1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 1994, by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #ident "%Z%%M% %I% %E% SMI" /* SMI4.1 1.4 */ 28 29 #include <ctype.h> 30 #include "util.h" 31 #include "table.h" 32 33 34 35 /* 36 * Hash table manager. Store/lookup strings, keyed by string 37 */ 38 39 /* 40 * Generate the key into the table using the first two letters 41 * of "str". The table is alphabetized, with no distinction between 42 * upper and lower case. Non-letters are given least significance. 43 */ 44 int 45 tablekey(str) 46 register char *str; 47 { 48 #define TOLOWER(c) (islower(c) ? c : \ 49 (isupper(c) ? tolower(c) : ('a'+NUMLETTERS-1))) 50 51 register int c1, c2; 52 53 c1 = *str++; 54 c2 = *str; 55 if (c1 == EOS) { 56 c2 = EOS; /* just in case */ 57 } 58 c1 = TOLOWER(c1) - 'a'; 59 c2 = TOLOWER(c2) - 'a'; 60 return (c1*NUMLETTERS + c2); 61 } 62 63 64 void 65 store(table, key, datum) 66 stringtable table; 67 char *key; 68 char *datum; 69 { 70 int index; 71 tablelist cur, new; 72 73 index = tablekey(key); 74 cur = table[index]; 75 76 new = MALLOC(tablenode); 77 new->key = key; 78 new->datum = datum; 79 new->next = cur; 80 table[index] = new; 81 } 82 83 84 char * 85 lookup(table, key) 86 stringtable table; 87 char *key; 88 { 89 tablelist cur; 90 91 cur = table[tablekey(key)]; 92 while (cur && strcmp(cur->key, key)) { 93 cur = cur->next; 94 } 95 if (cur) { 96 return (cur->datum); 97 } else { 98 return (NULL); 99 } 100 } 101