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-rw-r--r--db/recno/rec_put.c280
1 files changed, 280 insertions, 0 deletions
diff --git a/db/recno/rec_put.c b/db/recno/rec_put.c
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index 0000000000..1afae0d5a6
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+++ b/db/recno/rec_put.c
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+/*-
+ * 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. 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[] = "@(#)rec_put.c	8.7 (Berkeley) 8/18/94";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <db.h>
+#include "recno.h"
+
+/*
+ * __REC_PUT -- Add a recno item to the tree.
+ *
+ * Parameters:
+ *	dbp:	pointer to access method
+ *	key:	key
+ *	data:	data
+ *	flag:	R_CURSOR, R_IAFTER, R_IBEFORE, R_NOOVERWRITE
+ *
+ * Returns:
+ *	RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key is
+ *	already in the tree and R_NOOVERWRITE specified.
+ */
+int
+__rec_put(dbp, key, data, flags)
+	const DB *dbp;
+	DBT *key;
+	const DBT *data;
+	u_int flags;
+{
+	BTREE *t;
+	DBT fdata, tdata;
+	recno_t nrec;
+	int 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;
+	}
+
+	/*
+	 * If using fixed-length records, and the record is long, return
+	 * EINVAL.  If it's short, pad it out.  Use the record data return
+	 * memory, it's only short-term.
+	 */
+	if (F_ISSET(t, R_FIXLEN) && data->size != t->bt_reclen) {
+		if (data->size > t->bt_reclen)
+			goto einval;
+
+		if (t->bt_rdata.size < t->bt_reclen) {
+			t->bt_rdata.data = t->bt_rdata.data == NULL ?
+			    malloc(t->bt_reclen) :
+			    realloc(t->bt_rdata.data, t->bt_reclen);
+			if (t->bt_rdata.data == NULL)
+				return (RET_ERROR);
+			t->bt_rdata.size = t->bt_reclen;
+		}
+		memmove(t->bt_rdata.data, data->data, data->size);
+		memset((char *)t->bt_rdata.data + data->size,
+		    t->bt_bval, t->bt_reclen - data->size);
+		fdata.data = t->bt_rdata.data;
+		fdata.size = t->bt_reclen;
+	} else {
+		fdata.data = data->data;
+		fdata.size = data->size;
+	}
+
+	switch (flags) {
+	case R_CURSOR:
+		if (!F_ISSET(&t->bt_cursor, CURS_INIT))
+			goto einval;
+		nrec = t->bt_cursor.rcursor;
+		break;
+	case R_SETCURSOR:
+		if ((nrec = *(recno_t *)key->data) == 0)
+			goto einval;
+		break;
+	case R_IAFTER:
+		if ((nrec = *(recno_t *)key->data) == 0) {
+			nrec = 1;
+			flags = R_IBEFORE;
+		}
+		break;
+	case 0:
+	case R_IBEFORE:
+		if ((nrec = *(recno_t *)key->data) == 0)
+			goto einval;
+		break;
+	case R_NOOVERWRITE:
+		if ((nrec = *(recno_t *)key->data) == 0)
+			goto einval;
+		if (nrec <= t->bt_nrecs)
+			return (RET_SPECIAL);
+		break;
+	default:
+einval:		errno = EINVAL;
+		return (RET_ERROR);
+	}
+
+	/*
+	 * Make sure that records up to and including the put record are
+	 * already in the database.  If skipping records, create empty ones.
+	 */
+	if (nrec > t->bt_nrecs) {
+		if (!F_ISSET(t, R_EOF | R_INMEM) &&
+		    t->bt_irec(t, nrec) == RET_ERROR)
+			return (RET_ERROR);
+		if (nrec > t->bt_nrecs + 1) {
+			if (F_ISSET(t, R_FIXLEN)) {
+				if ((tdata.data =
+				    (void *)malloc(t->bt_reclen)) == NULL)
+					return (RET_ERROR);
+				tdata.size = t->bt_reclen;
+				memset(tdata.data, t->bt_bval, tdata.size);
+			} else {
+				tdata.data = NULL;
+				tdata.size = 0;
+			}
+			while (nrec > t->bt_nrecs + 1)
+				if (__rec_iput(t,
+				    t->bt_nrecs, &tdata, 0) != RET_SUCCESS)
+					return (RET_ERROR);
+			if (F_ISSET(t, R_FIXLEN))
+				free(tdata.data);
+		}
+	}
+
+	if ((status = __rec_iput(t, nrec - 1, &fdata, flags)) != RET_SUCCESS)
+		return (status);
+
+	if (flags == R_SETCURSOR)
+		t->bt_cursor.rcursor = nrec;
+	
+	F_SET(t, R_MODIFIED);
+	return (__rec_ret(t, NULL, nrec, key, NULL));
+}
+
+/*
+ * __REC_IPUT -- Add a recno item to the tree.
+ *
+ * Parameters:
+ *	t:	tree
+ *	nrec:	record number
+ *	data:	data
+ *
+ * Returns:
+ *	RET_ERROR, RET_SUCCESS
+ */
+int
+__rec_iput(t, nrec, data, flags)
+	BTREE *t;
+	recno_t nrec;
+	const DBT *data;
+	u_int flags;
+{
+	DBT tdata;
+	EPG *e;
+	PAGE *h;
+	indx_t index, nxtindex;
+	pgno_t pg;
+	u_int32_t nbytes;
+	int dflags, status;
+	char *dest, db[NOVFLSIZE];
+
+	/*
+	 * If the data won't fit on a page, store it on indirect pages.
+	 *
+	 * XXX
+	 * If the insert fails later on, these pages aren't recovered.
+	 */
+	if (data->size > t->bt_ovflsize) {
+		if (__ovfl_put(t, data, &pg) == RET_ERROR)
+			return (RET_ERROR);
+		tdata.data = db;
+		tdata.size = NOVFLSIZE;
+		*(pgno_t *)db = pg;
+		*(u_int32_t *)(db + sizeof(pgno_t)) = data->size;
+		dflags = P_BIGDATA;
+		data = &tdata;
+	} else
+		dflags = 0;
+
+	/* __rec_search pins the returned page. */
+	if ((e = __rec_search(t, nrec,
+	    nrec > t->bt_nrecs || flags == R_IAFTER || flags == R_IBEFORE ?
+	    SINSERT : SEARCH)) == NULL)
+		return (RET_ERROR);
+
+	h = e->page;
+	index = e->index;
+
+	/*
+	 * Add the specified key/data pair to the tree.  The R_IAFTER and
+	 * R_IBEFORE flags insert the key after/before the specified key.
+	 *
+	 * Pages are split as required.
+	 */
+	switch (flags) {
+	case R_IAFTER:
+		++index;
+		break;
+	case R_IBEFORE:
+		break;
+	default:
+		if (nrec < t->bt_nrecs &&
+		    __rec_dleaf(t, h, index) == RET_ERROR) {
+			mpool_put(t->bt_mp, h, 0);
+			return (RET_ERROR);
+		}
+		break;
+	}
+
+	/*
+	 * If not enough room, split the page.  The split code will insert
+	 * the key and data and unpin the current page.  If inserting into
+	 * the offset array, shift the pointers up.
+	 */
+	nbytes = NRLEAFDBT(data->size);
+	if (h->upper - h->lower < nbytes + sizeof(indx_t)) {
+		status = __bt_split(t, h, NULL, data, dflags, nbytes, index);
+		if (status == RET_SUCCESS)
+			++t->bt_nrecs;
+		return (status);
+	}
+
+	if (index < (nxtindex = NEXTINDEX(h)))
+		memmove(h->linp + index + 1, h->linp + index,
+		    (nxtindex - index) * sizeof(indx_t));
+	h->lower += sizeof(indx_t);
+
+	h->linp[index] = h->upper -= nbytes;
+	dest = (char *)h + h->upper;
+	WR_RLEAF(dest, data, dflags);
+
+	++t->bt_nrecs;
+	F_SET(t, B_MODIFIED);
+	mpool_put(t->bt_mp, h, MPOOL_DIRTY);
+
+	return (RET_SUCCESS);
+}
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-11-22 13:19:05 +0000