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Diffstat (limited to 'db/hash/ndbm.c')
| -rw-r--r-- | db/hash/ndbm.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/db/hash/ndbm.c b/db/hash/ndbm.c new file mode 100644 index 0000000000..2cbbe91368 --- /dev/null +++ b/db/hash/ndbm.c @@ -0,0 +1,202 @@ +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Margo Seltzer. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)ndbm.c 8.4 (Berkeley) 7/21/94"; +#endif /* LIBC_SCCS and not lint */ + +/* + * This package provides a dbm compatible interface to the new hashing + * package described in db(3). + */ + +#include <sys/param.h> + +#include <stdio.h> +#include <string.h> + +#include <ndbm.h> +#include "hash.h" + +/* + * Returns: + * *DBM on success + * NULL on failure + */ +extern DBM * +dbm_open(file, flags, mode) + const char *file; + int flags, mode; +{ + HASHINFO info; + char path[MAXPATHLEN]; + + info.bsize = 4096; + info.ffactor = 40; + info.nelem = 1; + info.cachesize = 0; + info.hash = NULL; + info.lorder = 0; + (void)strcpy(path, file); + (void)strcat(path, DBM_SUFFIX); + return ((DBM *)__hash_open(path, flags, mode, &info, 0)); +} + +extern void +dbm_close(db) + DBM *db; +{ + (void)(db->close)(db); +} + +/* + * Returns: + * DATUM on success + * NULL on failure + */ +extern datum +dbm_fetch(db, key) + DBM *db; + datum key; +{ + datum retval; + int status; + + status = (db->get)(db, (DBT *)&key, (DBT *)&retval, 0); + if (status) { + retval.dptr = NULL; + retval.dsize = 0; + } + return (retval); +} + +/* + * Returns: + * DATUM on success + * NULL on failure + */ +extern datum +dbm_firstkey(db) + DBM *db; +{ + int status; + datum retdata, retkey; + + status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_FIRST); + if (status) + retkey.dptr = NULL; + return (retkey); +} + +/* + * Returns: + * DATUM on success + * NULL on failure + */ +extern datum +dbm_nextkey(db) + DBM *db; +{ + int status; + datum retdata, retkey; + + status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_NEXT); + if (status) + retkey.dptr = NULL; + return (retkey); +} +/* + * Returns: + * 0 on success + * <0 failure + */ +extern int +dbm_delete(db, key) + DBM *db; + datum key; +{ + int status; + + status = (db->del)(db, (DBT *)&key, 0); + if (status) + return (-1); + else + return (0); +} + +/* + * Returns: + * 0 on success + * <0 failure + * 1 if DBM_INSERT and entry exists + */ +extern int +dbm_store(db, key, content, flags) + DBM *db; + datum key, content; + int flags; +{ + return ((db->put)(db, (DBT *)&key, (DBT *)&content, + (flags == DBM_INSERT) ? R_NOOVERWRITE : 0)); +} + +extern int +dbm_error(db) + DBM *db; +{ + HTAB *hp; + + hp = (HTAB *)db->internal; + return (hp->errno); +} + +extern int +dbm_clearerr(db) + DBM *db; +{ + HTAB *hp; + + hp = (HTAB *)db->internal; + hp->errno = 0; + return (0); +} + +extern int +dbm_dirfno(db) + DBM *db; +{ + return(((HTAB *)db->internal)->fp); +} |