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-rw-r--r--db2/dbm/dbm.c410
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diff --git a/db2/dbm/dbm.c b/db2/dbm/dbm.c
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+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997
+ * Sleepycat Software. All rights reserved.
+ */
+/*
+ * Copyright (c) 1990, 1993
+ * Margo Seltzer. All rights reserved.
+ */
+/*
+ * 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.
+ */
+
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)dbm.c 10.5 (Sleepycat) 7/19/97";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/param.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#endif
+
+#define DB_DBM_HSEARCH
+#include "db_int.h"
+
+#include "db_page.h"
+#include "hash.h"
+
+/*
+ *
+ * This package provides dbm and ndbm compatible interfaces to DB.
+ *
+ * The DBM routines, which call the NDBM routines.
+ */
+static DBM *__cur_db;
+
+static void __db_no_open __P((void));
+
+/* Provide prototypes here since there are none in db.h. */
+int dbm_error __P((DBM *));
+int dbm_clearerr __P((DBM *));
+int dbm_dirfno __P((DBM *));
+int dbm_pagfno __P((DBM *));
+
+int
+dbminit(file)
+ char *file;
+{
+ if (__cur_db != NULL)
+ (void)dbm_close(__cur_db);
+ if ((__cur_db =
+ dbm_open(file, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR)) != NULL)
+ return (0);
+ if ((__cur_db = dbm_open(file, O_RDONLY, 0)) != NULL)
+ return (0);
+ return (-1);
+}
+
+datum
+fetch(key)
+ datum key;
+{
+ datum item;
+
+ if (__cur_db == NULL) {
+ __db_no_open();
+ item.dptr = 0;
+ return (item);
+ }
+ return (dbm_fetch(__cur_db, key));
+}
+
+datum
+firstkey()
+{
+ datum item;
+
+ if (__cur_db == NULL) {
+ __db_no_open();
+ item.dptr = 0;
+ return (item);
+ }
+ return (dbm_firstkey(__cur_db));
+}
+
+datum
+nextkey(key)
+ datum key;
+{
+ datum item;
+
+ if (__cur_db == NULL) {
+ __db_no_open();
+ item.dptr = 0;
+ return (item);
+ }
+ return (dbm_nextkey(__cur_db));
+}
+
+int
+delete(key)
+ datum key;
+{
+ int ret;
+
+ if (__cur_db == NULL) {
+ __db_no_open();
+ return (-1);
+ }
+ ret = dbm_delete(__cur_db, key);
+ if (ret == 0)
+ ret = (((DB *)__cur_db)->sync)((DB *)__cur_db, 0);
+ return (ret);
+}
+
+int
+store(key, dat)
+ datum key, dat;
+{
+ int ret;
+
+ if (__cur_db == NULL) {
+ __db_no_open();
+ return (-1);
+ }
+ ret = dbm_store(__cur_db, key, dat, DBM_REPLACE);
+ if (ret == 0)
+ ret = (((DB *)__cur_db)->sync)((DB *)__cur_db, 0);
+ return (ret);
+}
+
+static void
+__db_no_open()
+{
+ (void)fprintf(stderr, "dbm: no open database.\n");
+}
+
+/*
+ * This package provides dbm and ndbm compatible interfaces to DB.
+ *
+ * The NDBM routines, which call the DB routines.
+ */
+/*
+ * Returns:
+ * *DBM on success
+ * NULL on failure
+ */
+DBM *
+dbm_open(file, oflags, mode)
+ const char *file;
+ int oflags, mode;
+{
+ DB *dbp;
+ DB_INFO dbinfo;
+ char path[MAXPATHLEN];
+
+ memset(&dbinfo, 0, sizeof(dbinfo));
+ dbinfo.db_pagesize = 4096;
+ dbinfo.h_ffactor = 40;
+ dbinfo.h_nelem = 1;
+
+ (void)snprintf(path, sizeof(path), "%s%s", file, DBM_SUFFIX);
+ if ((errno = db_open(path,
+ DB_HASH, __db_oflags(oflags), mode, NULL, &dbinfo, &dbp)) != 0)
+ return (NULL);
+ return ((DBM *)dbp);
+}
+
+/*
+ * Returns:
+ * Nothing.
+ */
+void
+dbm_close(db)
+ DBM *db;
+{
+ (void)db->close(db, 0);
+}
+
+/*
+ * Returns:
+ * DATUM on success
+ * NULL on failure
+ */
+datum
+dbm_fetch(db, key)
+ DBM *db;
+ datum key;
+{
+ DBT _key, _data;
+ datum data;
+ int status;
+
+ memset(&_key, 0, sizeof(DBT));
+ memset(&_data, 0, sizeof(DBT));
+ _key.size = key.dsize;
+ _key.data = key.dptr;
+ status = db->get((DB *)db, NULL, &_key, &_data, 0);
+ if (status) {
+ data.dptr = NULL;
+ data.dsize = 0;
+ } else {
+ data.dptr = _data.data;
+ data.dsize = _data.size;
+ }
+ return (data);
+}
+
+/*
+ * Returns:
+ * DATUM on success
+ * NULL on failure
+ */
+datum
+dbm_firstkey(db)
+ DBM *db;
+{
+ DBT _key, _data;
+ datum key;
+ int status;
+
+ DBC *cp;
+
+ if ((cp = TAILQ_FIRST(&db->curs_queue)) == NULL)
+ if ((errno = db->cursor(db, NULL, &cp)) != 0) {
+ memset(&key, 0, sizeof(key));
+ return (key);
+ }
+
+ memset(&_key, 0, sizeof(DBT));
+ memset(&_data, 0, sizeof(DBT));
+ status = (cp->c_get)(cp, &_key, &_data, DB_FIRST);
+ if (status) {
+ key.dptr = NULL;
+ key.dsize = 0;
+ } else {
+ key.dptr = _key.data;
+ key.dsize = _key.size;
+ }
+ return (key);
+}
+
+/*
+ * Returns:
+ * DATUM on success
+ * NULL on failure
+ */
+datum
+dbm_nextkey(db)
+ DBM *db;
+{
+ DBC *cp;
+ DBT _key, _data;
+ datum key;
+ int status;
+
+ if ((cp = TAILQ_FIRST(&db->curs_queue)) == NULL)
+ if ((errno = db->cursor(db, NULL, &cp)) != 0) {
+ memset(&key, 0, sizeof(key));
+ return (key);
+ }
+
+ memset(&_key, 0, sizeof(DBT));
+ memset(&_data, 0, sizeof(DBT));
+ status = (cp->c_get)(cp, &_key, &_data, DB_NEXT);
+ if (status) {
+ key.dptr = NULL;
+ key.dsize = 0;
+ } else {
+ key.dptr = _key.data;
+ key.dsize = _key.size;
+ }
+ return (key);
+}
+
+/*
+ * Returns:
+ * 0 on success
+ * <0 failure
+ */
+int
+dbm_delete(db, key)
+ DBM *db;
+ datum key;
+{
+ DBT _key;
+ int ret;
+
+ memset(&_key, 0, sizeof(DBT));
+ _key.data = key.dptr;
+ _key.size = key.dsize;
+ ret = (((DB *)db)->del)((DB *)db, NULL, &_key, 0);
+ if (ret < 0)
+ errno = ENOENT;
+ else if (ret > 0) {
+ errno = ret;
+ ret = -1;
+ }
+ return (ret);
+}
+
+/*
+ * Returns:
+ * 0 on success
+ * <0 failure
+ * 1 if DBM_INSERT and entry exists
+ */
+int
+dbm_store(db, key, data, flags)
+ DBM *db;
+ datum key, data;
+ int flags;
+{
+ DBT _key, _data;
+
+ memset(&_key, 0, sizeof(DBT));
+ memset(&_data, 0, sizeof(DBT));
+ _key.data = key.dptr;
+ _key.size = key.dsize;
+ _data.data = data.dptr;
+ _data.size = data.dsize;
+ return (db->put((DB *)db,
+ NULL, &_key, &_data, (flags == DBM_INSERT) ? DB_NOOVERWRITE : 0));
+}
+
+int
+dbm_error(db)
+ DBM *db;
+{
+ HTAB *hp;
+
+ hp = (HTAB *)db->internal;
+ return (hp->local_errno);
+}
+
+int
+dbm_clearerr(db)
+ DBM *db;
+{
+ HTAB *hp;
+
+ hp = (HTAB *)db->internal;
+ hp->local_errno = 0;
+ return (0);
+}
+
+/*
+ * XXX
+ * We only have a single file descriptor that we can return, not two. Return
+ * the same one for both files. Hopefully, the user is using it for locking
+ * and picked one to use at random.
+ */
+int
+dbm_dirfno(db)
+ DBM *db;
+{
+ int fd;
+
+ (void)db->fd(db, &fd);
+ return (fd);
+}
+
+int
+dbm_pagfno(db)
+ DBM *db;
+{
+ int fd;
+
+ (void)db->fd(db, &fd);
+ return (fd);
+}
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