diff options
Diffstat (limited to 'main/db1-ast/hash/ndbm.c')
| -rw-r--r-- | main/db1-ast/hash/ndbm.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/main/db1-ast/hash/ndbm.c b/main/db1-ast/hash/ndbm.c new file mode 100644 index 000000000..d702f737a --- /dev/null +++ b/main/db1-ast/hash/ndbm.c @@ -0,0 +1,235 @@ +/*- + * 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 <stdlib.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; +{ + DBM *db; + HASHINFO info; + const size_t len = strlen(file) + sizeof (DBM_SUFFIX); +#ifdef __GNUC__ + char path[len]; +#else + char *path = malloc(len); + if (path == NULL) + return NULL; +#endif + + info.bsize = 4096; + info.ffactor = 40; + info.nelem = 1; + info.cachesize = 0; + info.hash = NULL; + info.lorder = 0; + (void)strncpy(path, file, len - 1); + (void)strncat(path, DBM_SUFFIX, len - strlen(path) - 1); + db = (DBM *)__hash_open(path, flags, mode, &info, 0); +#ifndef __GNUC__ + free(path); +#endif + return db; +} + +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 retdata; + int status; + DBT dbtkey, dbtretdata; + + dbtkey.data = key.dptr; + dbtkey.size = key.dsize; + status = (db->get)(db, &dbtkey, &dbtretdata, 0); + if (status) { + dbtretdata.data = NULL; + dbtretdata.size = 0; + } + retdata.dptr = dbtretdata.data; + retdata.dsize = dbtretdata.size; + return (retdata); +} + +/* + * Returns: + * DATUM on success + * NULL on failure + */ +extern datum +dbm_firstkey(db) + DBM *db; +{ + int status; + datum retkey; + DBT dbtretkey, dbtretdata; + + status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST); + if (status) + dbtretkey.data = NULL; + retkey.dptr = dbtretkey.data; + retkey.dsize = dbtretkey.size; + return (retkey); +} + +/* + * Returns: + * DATUM on success + * NULL on failure + */ +extern datum +dbm_nextkey(db) + DBM *db; +{ + int status; + datum retkey; + DBT dbtretkey, dbtretdata; + + status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT); + if (status) + dbtretkey.data = NULL; + retkey.dptr = dbtretkey.data; + retkey.dsize = dbtretkey.size; + return (retkey); +} +/* + * Returns: + * 0 on success + * <0 failure + */ +extern int +dbm_delete(db, key) + DBM *db; + datum key; +{ + int status; + DBT dbtkey; + + dbtkey.data = key.dptr; + dbtkey.size = key.dsize; + status = (db->del)(db, &dbtkey, 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, data, flags) + DBM *db; + datum key, data; + int flags; +{ + DBT dbtkey, dbtdata; + + dbtkey.data = key.dptr; + dbtkey.size = key.dsize; + dbtdata.data = data.dptr; + dbtdata.size = data.dsize; + return ((db->put)(db, &dbtkey, &dbtdata, + (flags == DBM_INSERT) ? R_NOOVERWRITE : 0)); +} + +extern int +dbm_error(db) + DBM *db; +{ + HTAB *hp; + + hp = (HTAB *)db->internal; + return (hp->errnum); +} + +extern int +dbm_clearerr(db) + DBM *db; +{ + HTAB *hp; + + hp = (HTAB *)db->internal; + hp->errnum = 0; + return (0); +} + +extern int +dbm_dirfno(db) + DBM *db; +{ + return(((HTAB *)db->internal)->fp); +} |