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ypdb.c revision 1.4 
      1 /*	$NetBSD: ypdb.c,v 1.4 1997/10/13 03:42:30 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/cdefs.h>
     44 #ifndef lint
     45 __RCSID("$NetBSD: ypdb.c,v 1.4 1997/10/13 03:42:30 lukem Exp $");
     46 #endif
     47 
     48 #include <sys/param.h>
     49 #include <sys/types.h>
     50 
     51 #include <db.h>
     52 #include <errno.h>
     53 #include <stdio.h>
     54 #include <string.h>
     55 
     56 #include "ypdb.h"
     57 
     58 /*
     59  * Returns:
     60  * 	*DBM on success
     61  *	 NULL on failure
     62  */
     63 
     64 DBM *
     65 ypdb_open(file, flags, mode)
     66 	const char *file;
     67 	int flags, mode;
     68 {
     69 	char path[MAXPATHLEN], *cp;
     70 	DBM *db;
     71 	BTREEINFO info;
     72 
     73 	cp = strrchr(file, '.');
     74 	snprintf(path, sizeof(path), "%s%s", file,
     75 	    (cp != NULL && strcmp(cp, ".db") == 0) ? "" : YPDB_SUFFIX);
     76 
     77 		/* try our btree format first */
     78 	info.flags = 0;
     79 	info.cachesize = 0;
     80 	info.maxkeypage = 0;
     81 	info.minkeypage = 0;
     82 	info.psize = 0;
     83 	info.compare = NULL;
     84 	info.prefix = NULL;
     85 	info.lorder = 0;
     86 	db = (DBM *)dbopen(path, flags, mode, DB_BTREE, (void *)&info);
     87 	if (db != NULL || errno != EFTYPE)
     88 		return (db);
     89 
     90 		/* fallback to standard hash (for sendmail's aliases.db) */
     91 	db = (DBM *)dbopen(path, flags, mode, DB_HASH, NULL);
     92 	return (db);
     93 }
     94 
     95 void
     96 ypdb_close(db)
     97 	DBM *db;
     98 {
     99 	(void)(db->close)(db);
    100 }
    101 
    102 /*
    103  * Returns:
    104  *	DATUM on success
    105  *	NULL on failure
    106  */
    107 
    108 datum
    109 ypdb_fetch(db, key)
    110 	DBM *db;
    111 	datum key;
    112 {
    113 	datum retval;
    114 	int status;
    115 
    116 	status = (db->get)(db, (DBT *)&key, (DBT *)&retval, 0);
    117 	if (status) {
    118 		retval.dptr = NULL;
    119 		retval.dsize = 0;
    120 	}
    121 	return (retval);
    122 }
    123 
    124 /*
    125  * Returns:
    126  *	DATUM on success
    127  *	NULL on failure
    128  */
    129 
    130 datum
    131 ypdb_firstkey(db)
    132 	DBM *db;
    133 {
    134 	int status;
    135 	datum retdata, retkey;
    136 
    137 	status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_FIRST);
    138 	if (status)
    139 		retkey.dptr = NULL;
    140 	return (retkey);
    141 }
    142 
    143 /*
    144  * Returns:
    145  *	DATUM on success
    146  *	NULL on failure
    147  */
    148 
    149 datum
    150 ypdb_nextkey(db)
    151 	DBM *db;
    152 {
    153 	int status;
    154 	datum retdata, retkey;
    155 
    156 	status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_NEXT);
    157 	if (status)
    158 		retkey.dptr = NULL;
    159 	return (retkey);
    160 }
    161 
    162 /*
    163  * Returns:
    164  *	DATUM on success
    165  *	NULL on failure
    166  */
    167 
    168 datum
    169 ypdb_setkey(db, key)
    170 	DBM *db;
    171         datum key;
    172 {
    173 	int status;
    174 	datum retdata;
    175 	status = (db->seq)(db, (DBT *)&key, (DBT *)&retdata, R_CURSOR);
    176 	if (status)
    177 		key.dptr = NULL;
    178 	return (key);
    179 }
    180 
    181 /*
    182  * Returns:
    183  *	 0 on success
    184  *	<0 failure
    185  */
    186 
    187 int
    188 ypdb_delete(db, key)
    189 	DBM *db;
    190 	datum key;
    191 {
    192 	int status;
    193 
    194 	status = (db->del)(db, (DBT *)&key, 0);
    195 	if (status)
    196 		return (-1);
    197 	else
    198 		return (0);
    199 }
    200 
    201 /*
    202  * Returns:
    203  *	 0 on success
    204  *	<0 failure
    205  *	 1 if YPDB_INSERT and entry exists
    206  */
    207 
    208 int
    209 ypdb_store(db, key, content, flags)
    210 	DBM *db;
    211 	datum key, content;
    212 	int flags;
    213 {
    214 	return ((db->put)(db, (DBT *)&key, (DBT *)&content,
    215 	    (flags == YPDB_INSERT) ? R_NOOVERWRITE : 0));
    216 }
    217