ypdb.c revision 1.3
1 /* $NetBSD: ypdb.c,v 1.3 1997/10/07 14:39:06 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Margo Seltzer. 10 * 11 * This code is derived from ndbm module of BSD4.4 db (hash) by 12 * Mats O Jansson 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 31 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 32 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 34 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 */ 42 43 #include <sys/param.h> 44 #include <sys/types.h> 45 #include <stdio.h> 46 #include <string.h> 47 48 #define __DBINTERFACE_PRIVATE 49 #include <db.h> 50 51 #include "ypdb.h" 52 53 /* 54 * Returns: 55 * *DBM on success 56 * NULL on failure 57 */ 58 59 DBM * 60 ypdb_open(file, flags, mode) 61 const char *file; 62 int flags, mode; 63 { 64 char path[MAXPATHLEN]; 65 #ifdef YPDB_PATCH 66 HASHINFO info; 67 68 info.bsize = 4096; 69 info.ffactor = 40; 70 info.nelem = 1; 71 info.cachesize = NULL; 72 info.hash = NULL; 73 info.lorder = 0; 74 snprintf(path, sizeof(path), "%s%s", file, YPDB_SUFFIX); 75 return ((DBM *)__hash_open(path, flags, mode, &info, 0)); 76 #else 77 BTREEINFO info; 78 79 info.flags = 0; 80 info.cachesize = 0; 81 info.maxkeypage = 0; 82 info.minkeypage = 0; 83 info.psize = 0; 84 info.compare = NULL; 85 info.prefix = NULL; 86 info.lorder = 0; 87 snprintf(path, sizeof(path), "%s%s", file, YPDB_SUFFIX); 88 return ((DBM *)__bt_open(path, flags, mode, &info, 0)); 89 #endif 90 } 91 92 void 93 ypdb_close(db) 94 DBM *db; 95 { 96 (void)(db->close)(db); 97 } 98 99 /* 100 * Returns: 101 * DATUM on success 102 * NULL on failure 103 */ 104 105 datum 106 ypdb_fetch(db, key) 107 DBM *db; 108 datum key; 109 { 110 datum retval; 111 int status; 112 113 status = (db->get)(db, (DBT *)&key, (DBT *)&retval, 0); 114 if (status) { 115 retval.dptr = NULL; 116 retval.dsize = 0; 117 } 118 return (retval); 119 } 120 121 /* 122 * Returns: 123 * DATUM on success 124 * NULL on failure 125 */ 126 127 datum 128 ypdb_firstkey(db) 129 DBM *db; 130 { 131 int status; 132 datum retdata, retkey; 133 134 status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_FIRST); 135 if (status) 136 retkey.dptr = NULL; 137 return (retkey); 138 } 139 140 /* 141 * Returns: 142 * DATUM on success 143 * NULL on failure 144 */ 145 146 datum 147 ypdb_nextkey(db) 148 DBM *db; 149 { 150 int status; 151 datum retdata, retkey; 152 153 status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_NEXT); 154 if (status) 155 retkey.dptr = NULL; 156 return (retkey); 157 } 158 159 /* 160 * Returns: 161 * DATUM on success 162 * NULL on failure 163 */ 164 165 datum 166 ypdb_setkey(db, key) 167 DBM *db; 168 datum key; 169 { 170 int status; 171 datum retdata; 172 #ifdef YPDB_PATCH 173 datum retkey; 174 175 status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_FIRST); 176 if (status) 177 retkey.dptr = NULL; 178 while ((retkey.dptr != NULL) && 179 ((retkey.dsize != key.dsize) || 180 (strncmp(key.dptr,retkey.dptr,retkey.dsize) != 0))) { 181 status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_NEXT); 182 if (status) 183 retkey.dptr = NULL; 184 }; 185 return (retkey); 186 #else 187 status = (db->seq)(db, (DBT *)&key, (DBT *)&retdata, R_CURSOR); 188 if (status) 189 key.dptr = NULL; 190 return (key); 191 #endif 192 } 193 194 /* 195 * Returns: 196 * 0 on success 197 * <0 failure 198 */ 199 200 int 201 ypdb_delete(db, key) 202 DBM *db; 203 datum key; 204 { 205 int status; 206 207 status = (db->del)(db, (DBT *)&key, 0); 208 if (status) 209 return (-1); 210 else 211 return (0); 212 } 213 214 /* 215 * Returns: 216 * 0 on success 217 * <0 failure 218 * 1 if YPDB_INSERT and entry exists 219 */ 220 221 int 222 ypdb_store(db, key, content, flags) 223 DBM *db; 224 datum key, content; 225 int flags; 226 { 227 return ((db->put)(db, (DBT *)&key, (DBT *)&content, 228 (flags == YPDB_INSERT) ? R_NOOVERWRITE : 0)); 229 } 230
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