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-rw-r--r--_db1.85/recno/rec_utils.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/_db1.85/recno/rec_utils.c b/_db1.85/recno/rec_utils.c
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+++ b/_db1.85/recno/rec_utils.c
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+/* $OpenBSD: rec_utils.c,v 1.9 2015/01/16 16:48:51 deraadt Exp $ */
+/*-
+ * Copyright (c) 1990, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <db.h>
+#include "recno.h"
+
+/*
+ * __rec_ret --
+ * Build return data.
+ *
+ * Parameters:
+ * t: tree
+ * e: key/data pair to be returned
+ * nrec: record number
+ * key: user's key structure
+ * data: user's data structure
+ *
+ * Returns:
+ * RET_SUCCESS, RET_ERROR.
+ */
+int
+__rec_ret(BTREE *t, EPG *e, recno_t nrec, DBT *key, DBT *data)
+{
+ RLEAF *rl;
+ void *p;
+
+ if (key == NULL)
+ goto dataonly;
+
+ /* We have to copy the key, it's not on the page. */
+ if (sizeof(recno_t) > t->bt_rkey.size) {
+ p = realloc(t->bt_rkey.data, sizeof(recno_t));
+ if (p == NULL)
+ return (RET_ERROR);
+ t->bt_rkey.data = p;
+ t->bt_rkey.size = sizeof(recno_t);
+ }
+ memmove(t->bt_rkey.data, &nrec, sizeof(recno_t));
+ key->size = sizeof(recno_t);
+ key->data = t->bt_rkey.data;
+
+dataonly:
+ if (data == NULL)
+ return (RET_SUCCESS);
+
+ /*
+ * We must copy big keys/data to make them contigous. Otherwise,
+ * leave the page pinned and don't copy unless the user specified
+ * concurrent access.
+ */
+ rl = GETRLEAF(e->page, e->index);
+ if (rl->flags & P_BIGDATA) {
+ if (__ovfl_get(t, rl->bytes,
+ &data->size, &t->bt_rdata.data, &t->bt_rdata.size))
+ return (RET_ERROR);
+ data->data = t->bt_rdata.data;
+ } else if (F_ISSET(t, B_DB_LOCK)) {
+ /* Use +1 in case the first record retrieved is 0 length. */
+ if (rl->dsize + 1 > t->bt_rdata.size) {
+ p = realloc(t->bt_rdata.data, rl->dsize + 1);
+ if (p == NULL)
+ return (RET_ERROR);
+ t->bt_rdata.data = p;
+ t->bt_rdata.size = rl->dsize + 1;
+ }
+ memmove(t->bt_rdata.data, rl->bytes, rl->dsize);
+ data->size = rl->dsize;
+ data->data = t->bt_rdata.data;
+ } else {
+ data->size = rl->dsize;
+ data->data = rl->bytes;
+ }
+ return (RET_SUCCESS);
+}