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authorDimitri Sokolyuk <demon@dim13.org>2018-11-01 13:35:40 +0100
committerDimitri Sokolyuk <demon@dim13.org>2018-11-01 13:35:40 +0100
commit38e876d964346d3e4b88c52732b7ce5966d796a5 (patch)
treeb0a2853fc7d69f8ebe8aec648034a93ec98763a6 /_db1.85/btree/bt_get.c
import original 1.85 implementation from openbsd libc
Diffstat (limited to '_db1.85/btree/bt_get.c')
-rw-r--r--_db1.85/btree/bt_get.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/_db1.85/btree/bt_get.c b/_db1.85/btree/bt_get.c
new file mode 100644
index 0000000..52cf427
--- /dev/null
+++ b/_db1.85/btree/bt_get.c
@@ -0,0 +1,95 @@
+/* $OpenBSD: bt_get.c,v 1.8 2005/08/05 13:02:59 espie Exp $ */
+
+/*-
+ * Copyright (c) 1990, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Mike Olson.
+ *
+ * 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. 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 <sys/types.h>
+
+#include <errno.h>
+#include <stddef.h>
+#include <stdio.h>
+
+#include <db.h>
+#include "btree.h"
+
+/*
+ * __BT_GET -- Get a record from the btree.
+ *
+ * Parameters:
+ * dbp: pointer to access method
+ * key: key to find
+ * data: data to return
+ * flag: currently unused
+ *
+ * Returns:
+ * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
+ */
+int
+__bt_get(const DB *dbp, const DBT *key, DBT *data, u_int flags)
+{
+ BTREE *t;
+ EPG *e;
+ int exact, status;
+
+ t = dbp->internal;
+
+ /* Toss any page pinned across calls. */
+ if (t->bt_pinned != NULL) {
+ mpool_put(t->bt_mp, t->bt_pinned, 0);
+ t->bt_pinned = NULL;
+ }
+
+ /* Get currently doesn't take any flags. */
+ if (flags) {
+ errno = EINVAL;
+ return (RET_ERROR);
+ }
+
+ if ((e = __bt_search(t, key, &exact)) == NULL)
+ return (RET_ERROR);
+ if (!exact) {
+ mpool_put(t->bt_mp, e->page, 0);
+ return (RET_SPECIAL);
+ }
+
+ status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0);
+
+ /*
+ * If the user is doing concurrent access, we copied the
+ * key/data, toss the page.
+ */
+ if (F_ISSET(t, B_DB_LOCK))
+ mpool_put(t->bt_mp, e->page, 0);
+ else
+ t->bt_pinned = e->page;
+ return (status);
+}