Update.

	* Makeconfig (all-subdirs): Remove db and db2.
	* db/*: Removed.
	* db2/*: Removed.

15 files changed, 0 insertions, 4828 deletions

diff --git a/db/btree/bt_close.c b/db/btree/bt_close.c
deleted file mode 100644
index 27f9ab6..0000000
--- a/db/btree/bt_close.c
+++ /dev/null
@@ -1,182 +0,0 @@
-/*-
- * 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. 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[] = "@(#)bt_close.c	8.7 (Berkeley) 8/17/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/param.h>
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <db.h>
-#include "btree.h"
-
-static int bt_meta __P((BTREE *));
-
-/*
- * BT_CLOSE -- Close a btree.
- *
- * Parameters:
- *	dbp:	pointer to access method
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS
- */
-int
-__bt_close(dbp)
-	DB *dbp;
-{
-	BTREE *t;
-	int fd;
-
-	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;
-	}
-
-	/* Sync the tree. */
-	if (__bt_sync(dbp, 0) == RET_ERROR)
-		return (RET_ERROR);
-
-	/* Close the memory pool. */
-	if (mpool_close(t->bt_mp) == RET_ERROR)
-		return (RET_ERROR);
-
-	/* Free random memory. */
-	if (t->bt_cursor.key.data != NULL) {
-		free(t->bt_cursor.key.data);
-		t->bt_cursor.key.size = 0;
-		t->bt_cursor.key.data = NULL;
-	}
-	if (t->bt_rkey.data) {
-		free(t->bt_rkey.data);
-		t->bt_rkey.size = 0;
-		t->bt_rkey.data = NULL;
-	}
-	if (t->bt_rdata.data) {
-		free(t->bt_rdata.data);
-		t->bt_rdata.size = 0;
-		t->bt_rdata.data = NULL;
-	}
-
-	fd = t->bt_fd;
-	free(t);
-	free(dbp);
-	return (close(fd) ? RET_ERROR : RET_SUCCESS);
-}
-
-/*
- * BT_SYNC -- sync the btree to disk.
- *
- * Parameters:
- *	dbp:	pointer to access method
- *
- * Returns:
- *	RET_SUCCESS, RET_ERROR.
- */
-int
-__bt_sync(dbp, flags)
-	const DB *dbp;
-	u_int flags;
-{
-	BTREE *t;
-	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;
-	}
-
-	/* Sync doesn't currently take any flags. */
-	if (flags != 0) {
-		errno = EINVAL;
-		return (RET_ERROR);
-	}
-
-	if (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED))
-		return (RET_SUCCESS);
-
-	if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR)
-		return (RET_ERROR);
-
-	if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS)
-		F_CLR(t, B_MODIFIED);
-
-	return (status);
-}
-
-/*
- * BT_META -- write the tree meta data to disk.
- *
- * Parameters:
- *	t:	tree
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS
- */
-static int
-bt_meta(t)
-	BTREE *t;
-{
-	BTMETA m;
-	void *p;
-
-	if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL)
-		return (RET_ERROR);
-
-	/* Fill in metadata. */
-	m.magic = BTREEMAGIC;
-	m.version = BTREEVERSION;
-	m.psize = t->bt_psize;
-	m.free = t->bt_free;
-	m.nrecs = t->bt_nrecs;
-	m.flags = F_ISSET(t, SAVEMETA);
-
-	memmove(p, &m, sizeof(BTMETA));
-	mpool_put(t->bt_mp, p, MPOOL_DIRTY);
-	return (RET_SUCCESS);
-}
diff --git a/db/btree/bt_conv.c b/db/btree/bt_conv.c
deleted file mode 100644
index 1cb208b..0000000
--- a/db/btree/bt_conv.c
+++ /dev/null
@@ -1,221 +0,0 @@
-/*-
- * 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. 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[] = "@(#)bt_conv.c	8.5 (Berkeley) 8/17/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/param.h>
-
-#include <stdio.h>
-
-#include <db.h>
-#include "btree.h"
-
-static void mswap __P((PAGE *));
-
-/*
- * __BT_BPGIN, __BT_BPGOUT --
- *	Convert host-specific number layout to/from the host-independent
- *	format stored on disk.
- *
- * Parameters:
- *	t:	tree
- *	pg:	page number
- *	h:	page to convert
- */
-void
-__bt_pgin(t, pg, pp)
-	void *t;
-	pgno_t pg;
-	void *pp;
-{
-	PAGE *h;
-	indx_t i, top;
-	u_char flags;
-	char *p;
-
-	if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
-		return;
-	if (pg == P_META) {
-		mswap(pp);
-		return;
-	}
-
-	h = pp;
-	M_32_SWAP(h->pgno);
-	M_32_SWAP(h->prevpg);
-	M_32_SWAP(h->nextpg);
-	M_32_SWAP(h->flags);
-	M_16_SWAP(h->lower);
-	M_16_SWAP(h->upper);
-
-	top = NEXTINDEX(h);
-	if ((h->flags & P_TYPE) == P_BINTERNAL)
-		for (i = 0; i < top; i++) {
-			M_16_SWAP(h->linp[i]);
-			p = (char *)GETBINTERNAL(h, i);
-			P_32_SWAP(p);
-			p += sizeof(u_int32_t);
-			P_32_SWAP(p);
-			p += sizeof(pgno_t);
-			if (*(u_char *)p & P_BIGKEY) {
-				p += sizeof(u_char);
-				P_32_SWAP(p);
-				p += sizeof(pgno_t);
-				P_32_SWAP(p);
-			}
-		}
-	else if ((h->flags & P_TYPE) == P_BLEAF)
-		for (i = 0; i < top; i++) {
-			M_16_SWAP(h->linp[i]);
-			p = (char *)GETBLEAF(h, i);
-			P_32_SWAP(p);
-			p += sizeof(u_int32_t);
-			P_32_SWAP(p);
-			p += sizeof(u_int32_t);
-			flags = *(u_char *)p;
-			if (flags & (P_BIGKEY | P_BIGDATA)) {
-				p += sizeof(u_char);
-				if (flags & P_BIGKEY) {
-					P_32_SWAP(p);
-					p += sizeof(pgno_t);
-					P_32_SWAP(p);
-				}
-				if (flags & P_BIGDATA) {
-					p += sizeof(u_int32_t);
-					P_32_SWAP(p);
-					p += sizeof(pgno_t);
-					P_32_SWAP(p);
-				}
-			}
-		}
-}
-
-void
-__bt_pgout(t, pg, pp)
-	void *t;
-	pgno_t pg;
-	void *pp;
-{
-	PAGE *h;
-	indx_t i, top;
-	u_char flags;
-	char *p;
-
-	if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
-		return;
-	if (pg == P_META) {
-		mswap(pp);
-		return;
-	}
-
-	h = pp;
-	top = NEXTINDEX(h);
-	if ((h->flags & P_TYPE) == P_BINTERNAL)
-		for (i = 0; i < top; i++) {
-			p = (char *)GETBINTERNAL(h, i);
-			P_32_SWAP(p);
-			p += sizeof(u_int32_t);
-			P_32_SWAP(p);
-			p += sizeof(pgno_t);
-			if (*(u_char *)p & P_BIGKEY) {
-				p += sizeof(u_char);
-				P_32_SWAP(p);
-				p += sizeof(pgno_t);
-				P_32_SWAP(p);
-			}
-			M_16_SWAP(h->linp[i]);
-		}
-	else if ((h->flags & P_TYPE) == P_BLEAF)
-		for (i = 0; i < top; i++) {
-			p = (char *)GETBLEAF(h, i);
-			P_32_SWAP(p);
-			p += sizeof(u_int32_t);
-			P_32_SWAP(p);
-			p += sizeof(u_int32_t);
-			flags = *(u_char *)p;
-			if (flags & (P_BIGKEY | P_BIGDATA)) {
-				p += sizeof(u_char);
-				if (flags & P_BIGKEY) {
-					P_32_SWAP(p);
-					p += sizeof(pgno_t);
-					P_32_SWAP(p);
-				}
-				if (flags & P_BIGDATA) {
-					p += sizeof(u_int32_t);
-					P_32_SWAP(p);
-					p += sizeof(pgno_t);
-					P_32_SWAP(p);
-				}
-			}
-			M_16_SWAP(h->linp[i]);
-		}
-
-	M_32_SWAP(h->pgno);
-	M_32_SWAP(h->prevpg);
-	M_32_SWAP(h->nextpg);
-	M_32_SWAP(h->flags);
-	M_16_SWAP(h->lower);
-	M_16_SWAP(h->upper);
-}
-
-/*
- * MSWAP -- Actually swap the bytes on the meta page.
- *
- * Parameters:
- *	p:	page to convert
- */
-static void
-mswap(pg)
-	PAGE *pg;
-{
-	char *p;
-
-	p = (char *)pg;
-	P_32_SWAP(p);		/* magic */
-	p += sizeof(u_int32_t);
-	P_32_SWAP(p);		/* version */
-	p += sizeof(u_int32_t);
-	P_32_SWAP(p);		/* psize */
-	p += sizeof(u_int32_t);
-	P_32_SWAP(p);		/* free */
-	p += sizeof(u_int32_t);
-	P_32_SWAP(p);		/* nrecs */
-	p += sizeof(u_int32_t);
-	P_32_SWAP(p);		/* flags */
-	p += sizeof(u_int32_t);
-}
diff --git a/db/btree/bt_debug.c b/db/btree/bt_debug.c
deleted file mode 100644
index 3aefbe7..0000000
--- a/db/btree/bt_debug.c
+++ /dev/null
@@ -1,329 +0,0 @@
-/*-
- * 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. 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[] = "@(#)bt_debug.c	8.5 (Berkeley) 8/17/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/param.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <db.h>
-#include "btree.h"
-
-#ifdef DEBUG
-/*
- * BT_DUMP -- Dump the tree
- *
- * Parameters:
- *	dbp:	pointer to the DB
- */
-void
-__bt_dump(dbp)
-	DB *dbp;
-{
-	BTREE *t;
-	PAGE *h;
-	pgno_t i;
-	char *sep;
-
-	t = dbp->internal;
-	(void)fprintf(stderr, "%s: pgsz %d",
-	    F_ISSET(t, B_INMEM) ? "memory" : "disk", t->bt_psize);
-	if (F_ISSET(t, R_RECNO))
-		(void)fprintf(stderr, " keys %lu", t->bt_nrecs);
-#undef X
-#define	X(flag, name) \
-	if (F_ISSET(t, flag)) { \
-		(void)fprintf(stderr, "%s%s", sep, name); \
-		sep = ", "; \
-	}
-	if (t->flags != 0) {
-		sep = " flags (";
-		X(R_FIXLEN,	"FIXLEN");
-		X(B_INMEM,	"INMEM");
-		X(B_NODUPS,	"NODUPS");
-		X(B_RDONLY,	"RDONLY");
-		X(R_RECNO,	"RECNO");
-		X(B_METADIRTY,"METADIRTY");
-		(void)fprintf(stderr, ")\n");
-	}
-#undef X
-
-	for (i = P_ROOT; (h = mpool_get(t->bt_mp, i, 0)) != NULL; ++i) {
-		__bt_dpage(h);
-		(void)mpool_put(t->bt_mp, h, 0);
-	}
-}
-
-/*
- * BT_DMPAGE -- Dump the meta page
- *
- * Parameters:
- *	h:	pointer to the PAGE
- */
-void
-__bt_dmpage(h)
-	PAGE *h;
-{
-	BTMETA *m;
-	char *sep;
-
-	m = (BTMETA *)h;
-	(void)fprintf(stderr, "magic %lx\n", m->magic);
-	(void)fprintf(stderr, "version %lu\n", m->version);
-	(void)fprintf(stderr, "psize %lu\n", m->psize);
-	(void)fprintf(stderr, "free %lu\n", m->free);
-	(void)fprintf(stderr, "nrecs %lu\n", m->nrecs);
-	(void)fprintf(stderr, "flags %lu", m->flags);
-#undef X
-#define	X(flag, name) \
-	if (m->flags & flag) { \
-		(void)fprintf(stderr, "%s%s", sep, name); \
-		sep = ", "; \
-	}
-	if (m->flags) {
-		sep = " (";
-		X(B_NODUPS,	"NODUPS");
-		X(R_RECNO,	"RECNO");
-		(void)fprintf(stderr, ")");
-	}
-}
-
-/*
- * BT_DNPAGE -- Dump the page
- *
- * Parameters:
- *	n:	page number to dump.
- */
-void
-__bt_dnpage(dbp, pgno)
-	DB *dbp;
-	pgno_t pgno;
-{
-	BTREE *t;
-	PAGE *h;
-
-	t = dbp->internal;
-	if ((h = mpool_get(t->bt_mp, pgno, 0)) != NULL) {
-		__bt_dpage(h);
-		(void)mpool_put(t->bt_mp, h, 0);
-	}
-}
-
-/*
- * BT_DPAGE -- Dump the page
- *
- * Parameters:
- *	h:	pointer to the PAGE
- */
-void
-__bt_dpage(h)
-	PAGE *h;
-{
-	BINTERNAL *bi;
-	BLEAF *bl;
-	RINTERNAL *ri;
-	RLEAF *rl;
-	indx_t cur, top;
-	char *sep;
-
-	(void)fprintf(stderr, "    page %d: (", h->pgno);
-#undef X
-#define	X(flag, name) \
-	if (h->flags & flag) { \
-		(void)fprintf(stderr, "%s%s", sep, name); \
-		sep = ", "; \
-	}
-	sep = "";
-	X(P_BINTERNAL,	"BINTERNAL")		/* types */
-	X(P_BLEAF,	"BLEAF")
-	X(P_RINTERNAL,	"RINTERNAL")		/* types */
-	X(P_RLEAF,	"RLEAF")
-	X(P_OVERFLOW,	"OVERFLOW")
-	X(P_PRESERVE,	"PRESERVE");
-	(void)fprintf(stderr, ")\n");
-#undef X
-
-	(void)fprintf(stderr, "\tprev %2d next %2d", h->prevpg, h->nextpg);
-	if (h->flags & P_OVERFLOW)
-		return;
-
-	top = NEXTINDEX(h);
-	(void)fprintf(stderr, " lower %3d upper %3d nextind %d\n",
-	    h->lower, h->upper, top);
-	for (cur = 0; cur < top; cur++) {
-		(void)fprintf(stderr, "\t[%03d] %4d ", cur, h->linp[cur]);
-		switch (h->flags & P_TYPE) {
-		case P_BINTERNAL:
-			bi = GETBINTERNAL(h, cur);
-			(void)fprintf(stderr,
-			    "size %03d pgno %03d", bi->ksize, bi->pgno);
-			if (bi->flags & P_BIGKEY)
-				(void)fprintf(stderr, " (indirect)");
-			else if (bi->ksize)
-				(void)fprintf(stderr,
-				    " {%.*s}", (int)bi->ksize, bi->bytes);
-			break;
-		case P_RINTERNAL:
-			ri = GETRINTERNAL(h, cur);
-			(void)fprintf(stderr, "entries %03d pgno %03d",
-				ri->nrecs, ri->pgno);
-			break;
-		case P_BLEAF:
-			bl = GETBLEAF(h, cur);
-			if (bl->flags & P_BIGKEY)
-				(void)fprintf(stderr,
-				    "big key page %lu size %u/",
-				    *(pgno_t *)bl->bytes,
-				    *(u_int32_t *)(bl->bytes + sizeof(pgno_t)));
-			else if (bl->ksize)
-				(void)fprintf(stderr, "%s/", bl->bytes);
-			if (bl->flags & P_BIGDATA)
-				(void)fprintf(stderr,
-				    "big data page %lu size %u",
-				    *(pgno_t *)(bl->bytes + bl->ksize),
-				    *(u_int32_t *)(bl->bytes + bl->ksize +
-				    sizeof(pgno_t)));
-			else if (bl->dsize)
-				(void)fprintf(stderr, "%.*s",
-				    (int)bl->dsize, bl->bytes + bl->ksize);
-			break;
-		case P_RLEAF:
-			rl = GETRLEAF(h, cur);
-			if (rl->flags & P_BIGDATA)
-				(void)fprintf(stderr,
-				    "big data page %lu size %u",
-				    *(pgno_t *)rl->bytes,
-				    *(u_int32_t *)(rl->bytes + sizeof(pgno_t)));
-			else if (rl->dsize)
-				(void)fprintf(stderr,
-				    "%.*s", (int)rl->dsize, rl->bytes);
-			break;
-		}
-		(void)fprintf(stderr, "\n");
-	}
-}
-#endif
-
-#ifdef STATISTICS
-/*
- * BT_STAT -- Gather/print the tree statistics
- *
- * Parameters:
- *	dbp:	pointer to the DB
- */
-void
-__bt_stat(dbp)
-	DB *dbp;
-{
-	extern u_long bt_cache_hit, bt_cache_miss, bt_pfxsaved, bt_rootsplit;
-	extern u_long bt_sortsplit, bt_split;
-	BTREE *t;
-	PAGE *h;
-	pgno_t i, pcont, pinternal, pleaf;
-	u_long ifree, lfree, nkeys;
-	int levels;
-
-	t = dbp->internal;
-	pcont = pinternal = pleaf = 0;
-	nkeys = ifree = lfree = 0;
-	for (i = P_ROOT; (h = mpool_get(t->bt_mp, i, 0)) != NULL; ++i) {
-		switch (h->flags & P_TYPE) {
-		case P_BINTERNAL:
-		case P_RINTERNAL:
-			++pinternal;
-			ifree += h->upper - h->lower;
-			break;
-		case P_BLEAF:
-		case P_RLEAF:
-			++pleaf;
-			lfree += h->upper - h->lower;
-			nkeys += NEXTINDEX(h);
-			break;
-		case P_OVERFLOW:
-			++pcont;
-			break;
-		}
-		(void)mpool_put(t->bt_mp, h, 0);
-	}
-
-	/* Count the levels of the tree. */
-	for (i = P_ROOT, levels = 0 ;; ++levels) {
-		h = mpool_get(t->bt_mp, i, 0);
-		if (h->flags & (P_BLEAF|P_RLEAF)) {
-			if (levels == 0)
-				levels = 1;
-			(void)mpool_put(t->bt_mp, h, 0);
-			break;
-		}
-		i = F_ISSET(t, R_RECNO) ?
-		    GETRINTERNAL(h, 0)->pgno :
-		    GETBINTERNAL(h, 0)->pgno;
-		(void)mpool_put(t->bt_mp, h, 0);
-	}
-
-	(void)fprintf(stderr, "%d level%s with %ld keys",
-	    levels, levels == 1 ? "" : "s", nkeys);
-	if (F_ISSET(t, R_RECNO))
-		(void)fprintf(stderr, " (%ld header count)", t->bt_nrecs);
-	(void)fprintf(stderr,
-	    "\n%lu pages (leaf %ld, internal %ld, overflow %ld)\n",
-	    pinternal + pleaf + pcont, pleaf, pinternal, pcont);
-	(void)fprintf(stderr, "%ld cache hits, %ld cache misses\n",
-	    bt_cache_hit, bt_cache_miss);
-	(void)fprintf(stderr, "%ld splits (%ld root splits, %ld sort splits)\n",
-	    bt_split, bt_rootsplit, bt_sortsplit);
-	pleaf *= t->bt_psize - BTDATAOFF;
-	if (pleaf)
-		(void)fprintf(stderr,
-		    "%.0f%% leaf fill (%ld bytes used, %ld bytes free)\n",
-		    ((double)(pleaf - lfree) / pleaf) * 100,
-		    pleaf - lfree, lfree);
-	pinternal *= t->bt_psize - BTDATAOFF;
-	if (pinternal)
-		(void)fprintf(stderr,
-		    "%.0f%% internal fill (%ld bytes used, %ld bytes free\n",
-		    ((double)(pinternal - ifree) / pinternal) * 100,
-		    pinternal - ifree, ifree);
-	if (bt_pfxsaved)
-		(void)fprintf(stderr, "prefix checking removed %lu bytes.\n",
-		    bt_pfxsaved);
-}
-#endif
diff --git a/db/btree/bt_delete.c b/db/btree/bt_delete.c
deleted file mode 100644
index b654c9f..0000000
--- a/db/btree/bt_delete.c
+++ /dev/null
@@ -1,657 +0,0 @@
-/*-
- * 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. 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[] = "@(#)bt_delete.c	8.13 (Berkeley) 7/28/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <stdio.h>
-#include <string.h>
-
-#include <db.h>
-#include "btree.h"
-
-static int __bt_bdelete __P((BTREE *, const DBT *));
-static int __bt_curdel __P((BTREE *, const DBT *, PAGE *, u_int));
-static int __bt_pdelete __P((BTREE *, PAGE *));
-static int __bt_relink __P((BTREE *, PAGE *));
-static int __bt_stkacq __P((BTREE *, PAGE **, CURSOR *));
-
-/*
- * __bt_delete
- *	Delete the item(s) referenced by a key.
- *
- * Return RET_SPECIAL if the key is not found.
- */
-int
-__bt_delete(dbp, key, flags)
-	const DB *dbp;
-	const DBT *key;
-	u_int flags;
-{
-	BTREE *t;
-	CURSOR *c;
-	PAGE *h;
-	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;
-	}
-
-	/* Check for change to a read-only tree. */
-	if (F_ISSET(t, B_RDONLY)) {
-		errno = EPERM;
-		return (RET_ERROR);
-	}
-
-	switch (flags) {
-	case 0:
-		status = __bt_bdelete(t, key);
-		break;
-	case R_CURSOR:
-		/*
-		 * If flags is R_CURSOR, delete the cursor.  Must already
-		 * have started a scan and not have already deleted it.
-		 */
-		c = &t->bt_cursor;
-		if (F_ISSET(c, CURS_INIT)) {
-			if (F_ISSET(c, CURS_ACQUIRE | CURS_AFTER | CURS_BEFORE))
-				return (RET_SPECIAL);
-			if ((h = mpool_get(t->bt_mp, c->pg.pgno, 0)) == NULL)
-				return (RET_ERROR);
-
-			/*
-			 * If the page is about to be emptied, we'll need to
-			 * delete it, which means we have to acquire a stack.
-			 */
-			if (NEXTINDEX(h) == 1)
-				if (__bt_stkacq(t, &h, &t->bt_cursor))
-					return (RET_ERROR);
-
-			status = __bt_dleaf(t, NULL, h, c->pg.index);
-
-			if (NEXTINDEX(h) == 0 && status == RET_SUCCESS) {
-				if (__bt_pdelete(t, h))
-					return (RET_ERROR);
-			} else
-				mpool_put(t->bt_mp,
-				    h, status == RET_SUCCESS ? MPOOL_DIRTY : 0);
-			break;
-		}
-		/* FALLTHROUGH */
-	default:
-		errno = EINVAL;
-		return (RET_ERROR);
-	}
-	if (status == RET_SUCCESS)
-		F_SET(t, B_MODIFIED);
-	return (status);
-}
-
-/*
- * __bt_stkacq --
- *	Acquire a stack so we can delete a cursor entry.
- *
- * Parameters:
- *	  t:	tree
- *	 hp:	pointer to current, pinned PAGE pointer
- *	  c:	pointer to the cursor
- *
- * Returns:
- *	0 on success, 1 on failure
- */
-static int
-__bt_stkacq(t, hp, c)
-	BTREE *t;
-	PAGE **hp;
-	CURSOR *c;
-{
-	BINTERNAL *bi;
-	EPG *e;
-	EPGNO *parent;
-	PAGE *h;
-	indx_t index;
-	pgno_t pgno;
-	recno_t nextpg, prevpg;
-	int exact, level;
-
-	/*
-	 * Find the first occurrence of the key in the tree.  Toss the
-	 * currently locked page so we don't hit an already-locked page.
-	 */
-	h = *hp;
-	mpool_put(t->bt_mp, h, 0);
-	if ((e = __bt_search(t, &c->key, &exact)) == NULL)
-		return (1);
-	h = e->page;
-
-	/* See if we got it in one shot. */
-	if (h->pgno == c->pg.pgno)
-		goto ret;
-
-	/*
-	 * Move right, looking for the page.  At each move we have to move
-	 * up the stack until we don't have to move to the next page.  If
-	 * we have to change pages at an internal level, we have to fix the
-	 * stack back up.
-	 */
-	while (h->pgno != c->pg.pgno) {
-		if ((nextpg = h->nextpg) == P_INVALID)
-			break;
-		mpool_put(t->bt_mp, h, 0);
-
-		/* Move up the stack. */
-		for (level = 0; (parent = BT_POP(t)) != NULL; ++level) {
-			/* Get the parent page. */
-			if ((h = mpool_get(t->bt_mp, parent->pgno, 0)) == NULL)
-				return (1);
-
-			/* Move to the next index. */
-			if (parent->index != NEXTINDEX(h) - 1) {
-				index = parent->index + 1;
-				BT_PUSH(t, h->pgno, index);
-				break;
-			}
-			mpool_put(t->bt_mp, h, 0);
-		}
-
-		/* Restore the stack. */
-		while (level--) {
-			/* Push the next level down onto the stack. */
-			bi = GETBINTERNAL(h, index);
-			pgno = bi->pgno;
-			BT_PUSH(t, pgno, 0);
-
-			/* Lose the currently pinned page. */
-			mpool_put(t->bt_mp, h, 0);
-
-			/* Get the next level down. */
-			if ((h = mpool_get(t->bt_mp, pgno, 0)) == NULL)
-				return (1);
-			index = 0;
-		}
-		mpool_put(t->bt_mp, h, 0);
-		if ((h = mpool_get(t->bt_mp, nextpg, 0)) == NULL)
-			return (1);
-	}
-
-	if (h->pgno == c->pg.pgno)
-		goto ret;
-
-	/* Reacquire the original stack. */
-	mpool_put(t->bt_mp, h, 0);
-	if ((e = __bt_search(t, &c->key, &exact)) == NULL)
-		return (1);
-	h = e->page;
-
-	/*
-	 * Move left, looking for the page.  At each move we have to move
-	 * up the stack until we don't have to change pages to move to the
-	 * next page.  If we have to change pages at an internal level, we
-	 * have to fix the stack back up.
-	 */
-	while (h->pgno != c->pg.pgno) {
-		if ((prevpg = h->prevpg) == P_INVALID)
-			break;
-		mpool_put(t->bt_mp, h, 0);
-
-		/* Move up the stack. */
-		for (level = 0; (parent = BT_POP(t)) != NULL; ++level) {
-			/* Get the parent page. */
-			if ((h = mpool_get(t->bt_mp, parent->pgno, 0)) == NULL)
-				return (1);
-
-			/* Move to the next index. */
-			if (parent->index != 0) {
-				index = parent->index - 1;
-				BT_PUSH(t, h->pgno, index);
-				break;
-			}
-			mpool_put(t->bt_mp, h, 0);
-		}
-
-		/* Restore the stack. */
-		while (level--) {
-			/* Push the next level down onto the stack. */
-			bi = GETBINTERNAL(h, index);
-			pgno = bi->pgno;
-
-			/* Lose the currently pinned page. */
-			mpool_put(t->bt_mp, h, 0);
-
-			/* Get the next level down. */
-			if ((h = mpool_get(t->bt_mp, pgno, 0)) == NULL)
-				return (1);
-
-			index = NEXTINDEX(h) - 1;
-			BT_PUSH(t, pgno, index);
-		}
-		mpool_put(t->bt_mp, h, 0);
-		if ((h = mpool_get(t->bt_mp, prevpg, 0)) == NULL)
-			return (1);
-	}
-
-
-ret:	mpool_put(t->bt_mp, h, 0);
-	return ((*hp = mpool_get(t->bt_mp, c->pg.pgno, 0)) == NULL);
-}
-
-/*
- * __bt_bdelete --
- *	Delete all key/data pairs matching the specified key.
- *
- * Parameters:
- *	  t:	tree
- *	key:	key to delete
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
- */
-static int
-__bt_bdelete(t, key)
-	BTREE *t;
-	const DBT *key;
-{
-	EPG *e;
-	PAGE *h;
-	int deleted, exact, redo;
-
-	deleted = 0;
-
-	/* Find any matching record; __bt_search pins the page. */
-loop:	if ((e = __bt_search(t, key, &exact)) == NULL)
-		return (deleted ? RET_SUCCESS : RET_ERROR);
-	if (!exact) {
-		mpool_put(t->bt_mp, e->page, 0);
-		return (deleted ? RET_SUCCESS : RET_SPECIAL);
-	}
-
-	/*
-	 * Delete forward, then delete backward, from the found key.  If
-	 * there are duplicates and we reach either side of the page, do
-	 * the key search again, so that we get them all.
-	 */
-	redo = 0;
-	h = e->page;
-	do {
-		if (__bt_dleaf(t, key, h, e->index)) {
-			mpool_put(t->bt_mp, h, 0);
-			return (RET_ERROR);
-		}
-		if (F_ISSET(t, B_NODUPS)) {
-			if (NEXTINDEX(h) == 0) {
-				if (__bt_pdelete(t, h))
-					return (RET_ERROR);
-			} else
-				mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-			return (RET_SUCCESS);
-		}
-		deleted = 1;
-	} while (e->index < NEXTINDEX(h) && __bt_cmp(t, key, e) == 0);
-
-	/* Check for right-hand edge of the page. */
-	if (e->index == NEXTINDEX(h))
-		redo = 1;
-
-	/* Delete from the key to the beginning of the page. */
-	while (e->index-- > 0) {
-		if (__bt_cmp(t, key, e) != 0)
-			break;
-		if (__bt_dleaf(t, key, h, e->index) == RET_ERROR) {
-			mpool_put(t->bt_mp, h, 0);
-			return (RET_ERROR);
-		}
-		if (e->index == 0)
-			redo = 1;
-	}
-
-	/* Check for an empty page. */
-	if (NEXTINDEX(h) == 0) {
-		if (__bt_pdelete(t, h))
-			return (RET_ERROR);
-		goto loop;
-	}
-
-	/* Put the page. */
-	mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-
-	if (redo)
-		goto loop;
-	return (RET_SUCCESS);
-}
-
-/*
- * __bt_pdelete --
- *	Delete a single page from the tree.
- *
- * Parameters:
- *	t:	tree
- *	h:	leaf page
- *
- * Returns:
- *	RET_SUCCESS, RET_ERROR.
- *
- * Side-effects:
- *	mpool_put's the page
- */
-static int
-__bt_pdelete(t, h)
-	BTREE *t;
-	PAGE *h;
-{
-	BINTERNAL *bi;
-	PAGE *pg;
-	EPGNO *parent;
-	indx_t cnt, index, *ip, offset;
-	u_int32_t nksize;
-	char *from;
-
-	/*
-	 * Walk the parent page stack -- a LIFO stack of the pages that were
-	 * traversed when we searched for the page where the delete occurred.
-	 * Each stack entry is a page number and a page index offset.  The
-	 * offset is for the page traversed on the search.  We've just deleted
-	 * a page, so we have to delete the key from the parent page.
-	 *
-	 * If the delete from the parent page makes it empty, this process may
-	 * continue all the way up the tree.  We stop if we reach the root page
-	 * (which is never deleted, it's just not worth the effort) or if the
-	 * delete does not empty the page.
-	 */
-	while ((parent = BT_POP(t)) != NULL) {
-		/* Get the parent page. */
-		if ((pg = mpool_get(t->bt_mp, parent->pgno, 0)) == NULL)
-			return (RET_ERROR);
-
-		index = parent->index;
-		bi = GETBINTERNAL(pg, index);
-
-		/* Free any overflow pages. */
-		if (bi->flags & P_BIGKEY &&
-		    __ovfl_delete(t, bi->bytes) == RET_ERROR) {
-			mpool_put(t->bt_mp, pg, 0);
-			return (RET_ERROR);
-		}
-
-		/*
-		 * Free the parent if it has only the one key and it's not the
-		 * root page. If it's the rootpage, turn it back into an empty
-		 * leaf page.
-		 */
-		if (NEXTINDEX(pg) == 1) {
-			if (pg->pgno == P_ROOT) {
-				pg->lower = BTDATAOFF;
-				pg->upper = t->bt_psize;
-				pg->flags = P_BLEAF;
-			} else {
-				if (__bt_relink(t, pg) || __bt_free(t, pg))
-					return (RET_ERROR);
-				continue;
-			}
-		} else {
-			/* Pack remaining key items at the end of the page. */
-			nksize = NBINTERNAL(bi->ksize);
-			from = (char *)pg + pg->upper;
-			memmove(from + nksize, from, (char *)bi - from);
-			pg->upper += nksize;
-
-			/* Adjust indices' offsets, shift the indices down. */
-			offset = pg->linp[index];
-			for (cnt = index, ip = &pg->linp[0]; cnt--; ++ip)
-				if (ip[0] < offset)
-					ip[0] += nksize;
-			for (cnt = NEXTINDEX(pg) - index; --cnt; ++ip)
-				ip[0] = ip[1] < offset ? ip[1] + nksize : ip[1];
-			pg->lower -= sizeof(indx_t);
-		}
-
-		mpool_put(t->bt_mp, pg, MPOOL_DIRTY);
-		break;
-	}
-
-	/* Free the leaf page, as long as it wasn't the root. */
-	if (h->pgno == P_ROOT) {
-		mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-		return (RET_SUCCESS);
-	}
-	return (__bt_relink(t, h) || __bt_free(t, h));
-}
-
-/*
- * __bt_dleaf --
- *	Delete a single record from a leaf page.
- *
- * Parameters:
- *	t:	tree
- *    key:	referenced key
- *	h:	page
- *	index:	index on page to delete
- *
- * Returns:
- *	RET_SUCCESS, RET_ERROR.
- */
-int
-__bt_dleaf(t, key, h, index)
-	BTREE *t;
-	const DBT *key;
-	PAGE *h;
-	u_int index;
-{
-	BLEAF *bl;
-	indx_t cnt, *ip, offset;
-	u_int32_t nbytes;
-	void *to;
-	char *from;
-
-	/* If this record is referenced by the cursor, delete the cursor. */
-	if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
-	    !F_ISSET(&t->bt_cursor, CURS_ACQUIRE) &&
-	    t->bt_cursor.pg.pgno == h->pgno && t->bt_cursor.pg.index == index &&
-	    __bt_curdel(t, key, h, index))
-		return (RET_ERROR);
-
-	/* If the entry uses overflow pages, make them available for reuse. */
-	to = bl = GETBLEAF(h, index);
-	if (bl->flags & P_BIGKEY && __ovfl_delete(t, bl->bytes) == RET_ERROR)
-		return (RET_ERROR);
-	if (bl->flags & P_BIGDATA &&
-	    __ovfl_delete(t, bl->bytes + bl->ksize) == RET_ERROR)
-		return (RET_ERROR);
-
-	/* Pack the remaining key/data items at the end of the page. */
-	nbytes = NBLEAF(bl);
-	from = (char *)h + h->upper;
-	memmove(from + nbytes, from, (char *)to - from);
-	h->upper += nbytes;
-
-	/* Adjust the indices' offsets, shift the indices down. */
-	offset = h->linp[index];
-	for (cnt = index, ip = &h->linp[0]; cnt--; ++ip)
-		if (ip[0] < offset)
-			ip[0] += nbytes;
-	for (cnt = NEXTINDEX(h) - index; --cnt; ++ip)
-		ip[0] = ip[1] < offset ? ip[1] + nbytes : ip[1];
-	h->lower -= sizeof(indx_t);
-
-	/* If the cursor is on this page, adjust it as necessary. */
-	if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
-	    !F_ISSET(&t->bt_cursor, CURS_ACQUIRE) &&
-	    t->bt_cursor.pg.pgno == h->pgno && t->bt_cursor.pg.index > index)
-		--t->bt_cursor.pg.index;
-
-	return (RET_SUCCESS);
-}
-
-/*
- * __bt_curdel --
- *	Delete the cursor.
- *
- * Parameters:
- *	t:	tree
- *    key:	referenced key (or NULL)
- *	h:	page
- *  index:	index on page to delete
- *
- * Returns:
- *	RET_SUCCESS, RET_ERROR.
- */
-static int
-__bt_curdel(t, key, h, index)
-	BTREE *t;
-	const DBT *key;
-	PAGE *h;
-	u_int index;
-{
-	CURSOR *c;
-	EPG e;
-	PAGE *pg;
-	int curcopy, status;
-
-	/*
-	 * If there are duplicates, move forward or backward to one.
-	 * Otherwise, copy the key into the cursor area.
-	 */
-	c = &t->bt_cursor;
-	F_CLR(c, CURS_AFTER | CURS_BEFORE | CURS_ACQUIRE);
-
-	curcopy = 0;
-	if (!F_ISSET(t, B_NODUPS)) {
-		/*
-		 * We're going to have to do comparisons.  If we weren't
-		 * provided a copy of the key, i.e. the user is deleting
-		 * the current cursor position, get one.
-		 */
-		if (key == NULL) {
-			e.page = h;
-			e.index = index;
-			if ((status = __bt_ret(t, &e,
-			    &c->key, &c->key, NULL, NULL, 1)) != RET_SUCCESS)
-				return (status);
-			curcopy = 1;
-			key = &c->key;
-		}
-		/* Check previous key, if not at the beginning of the page. */
-		if (index > 0) {
-			e.page = h;
-			e.index = index - 1;
-			if (__bt_cmp(t, key, &e) == 0) {
-				F_SET(c, CURS_BEFORE);
-				goto dup2;
-			}
-		}
-		/* Check next key, if not at the end of the page. */
-		if (index < NEXTINDEX(h) - 1) {
-			e.page = h;
-			e.index = index + 1;
-			if (__bt_cmp(t, key, &e) == 0) {
-				F_SET(c, CURS_AFTER);
-				goto dup2;
-			}
-		}
-		/* Check previous key if at the beginning of the page. */
-		if (index == 0 && h->prevpg != P_INVALID) {
-			if ((pg = mpool_get(t->bt_mp, h->prevpg, 0)) == NULL)
-				return (RET_ERROR);
-			e.page = pg;
-			e.index = NEXTINDEX(pg) - 1;
-			if (__bt_cmp(t, key, &e) == 0) {
-				F_SET(c, CURS_BEFORE);
-				goto dup1;
-			}
-			mpool_put(t->bt_mp, pg, 0);
-		}
-		/* Check next key if at the end of the page. */
-		if (index == NEXTINDEX(h) - 1 && h->nextpg != P_INVALID) {
-			if ((pg = mpool_get(t->bt_mp, h->nextpg, 0)) == NULL)
-				return (RET_ERROR);
-			e.page = pg;
-			e.index = 0;
-			if (__bt_cmp(t, key, &e) == 0) {
-				F_SET(c, CURS_AFTER);
-dup1:				mpool_put(t->bt_mp, pg, 0);
-dup2:				c->pg.pgno = e.page->pgno;
-				c->pg.index = e.index;
-				return (RET_SUCCESS);
-			}
-			mpool_put(t->bt_mp, pg, 0);
-		}
-	}
-	e.page = h;
-	e.index = index;
-	if (curcopy || (status =
-	    __bt_ret(t, &e, &c->key, &c->key, NULL, NULL, 1)) == RET_SUCCESS) {
-		F_SET(c, CURS_ACQUIRE);
-		return (RET_SUCCESS);
-	}
-	return (status);
-}
-
-/*
- * __bt_relink --
- *	Link around a deleted page.
- *
- * Parameters:
- *	t:	tree
- *	h:	page to be deleted
- */
-static int
-__bt_relink(t, h)
-	BTREE *t;
-	PAGE *h;
-{
-	PAGE *pg;
-
-	if (h->nextpg != P_INVALID) {
-		if ((pg = mpool_get(t->bt_mp, h->nextpg, 0)) == NULL)
-			return (RET_ERROR);
-		pg->prevpg = h->prevpg;
-		mpool_put(t->bt_mp, pg, MPOOL_DIRTY);
-	}
-	if (h->prevpg != P_INVALID) {
-		if ((pg = mpool_get(t->bt_mp, h->prevpg, 0)) == NULL)
-			return (RET_ERROR);
-		pg->nextpg = h->nextpg;
-		mpool_put(t->bt_mp, pg, MPOOL_DIRTY);
-	}
-	return (0);
-}
diff --git a/db/btree/bt_get.c b/db/btree/bt_get.c
deleted file mode 100644
index 74824c7..0000000
--- a/db/btree/bt_get.c
+++ /dev/null
@@ -1,105 +0,0 @@
-/*-
- * 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. 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[] = "@(#)bt_get.c	8.6 (Berkeley) 7/20/94";
-#endif /* LIBC_SCCS and not lint */
-
-#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(dbp, key, data, flags)
-	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);
-}
diff --git a/db/btree/bt_open.c b/db/btree/bt_open.c
deleted file mode 100644
index 8c2f48e..0000000
--- a/db/btree/bt_open.c
+++ /dev/null
@@ -1,458 +0,0 @@
-/*-
- * 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. 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[] = "@(#)bt_open.c	8.10 (Berkeley) 8/17/94";
-#endif /* LIBC_SCCS and not lint */
-
-/*
- * Implementation of btree access method for 4.4BSD.
- *
- * The design here was originally based on that of the btree access method
- * used in the Postgres database system at UC Berkeley.  This implementation
- * is wholly independent of the Postgres code.
- */
-
-#include <sys/param.h>
-#include <sys/stat.h>
-
-#include <errno.h>
-#include <fcntl.h>
-#include <limits.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <db.h>
-#include "btree.h"
-
-#ifdef DEBUG
-#undef	MINPSIZE
-#define	MINPSIZE	128
-#endif
-
-static int byteorder __P((void));
-static int nroot __P((BTREE *));
-static int tmp __P((void));
-
-/*
- * __BT_OPEN -- Open a btree.
- *
- * Creates and fills a DB struct, and calls the routine that actually
- * opens the btree.
- *
- * Parameters:
- *	fname:	filename (NULL for in-memory trees)
- *	flags:	open flag bits
- *	mode:	open permission bits
- *	b:	BTREEINFO pointer
- *
- * Returns:
- *	NULL on failure, pointer to DB on success.
- *
- */
-DB *
-__bt_open(fname, flags, mode, openinfo, dflags)
-	const char *fname;
-	int flags, mode, dflags;
-	const BTREEINFO *openinfo;
-{
-	struct stat sb;
-	BTMETA m;
-	BTREE *t;
-	BTREEINFO b;
-	DB *dbp;
-	pgno_t ncache;
-	ssize_t nr;
-	int machine_lorder;
-
-	t = NULL;
-
-	/*
-	 * Intention is to make sure all of the user's selections are okay
-	 * here and then use them without checking.  Can't be complete, since
-	 * we don't know the right page size, lorder or flags until the backing
-	 * file is opened.  Also, the file's page size can cause the cachesize
-	 * to change.
-	 */
-	machine_lorder = byteorder();
-	if (openinfo) {
-		b = *openinfo;
-
-		/* Flags: R_DUP. */
-		if (b.flags & ~(R_DUP))
-			goto einval;
-
-		/*
-		 * Page size must be indx_t aligned and >= MINPSIZE.  Default
-		 * page size is set farther on, based on the underlying file
-		 * transfer size.
-		 */
-		if (b.psize &&
-		    (b.psize < MINPSIZE || b.psize > MAX_PAGE_OFFSET + 1 ||
-		    b.psize & (sizeof(indx_t) - 1)))
-			goto einval;
-
-		/* Minimum number of keys per page; absolute minimum is 2. */
-		if (b.minkeypage) {
-			if (b.minkeypage < 2)
-				goto einval;
-		} else
-			b.minkeypage = DEFMINKEYPAGE;
-
-		/* If no comparison, use default comparison and prefix. */
-		if (b.compare == NULL) {
-			b.compare = __bt_defcmp;
-			if (b.prefix == NULL)
-				b.prefix = __bt_defpfx;
-		}
-
-		if (b.lorder == 0)
-			b.lorder = machine_lorder;
-	} else {
-		b.compare = __bt_defcmp;
-		b.cachesize = 0;
-		b.flags = 0;
-		b.lorder = machine_lorder;
-		b.minkeypage = DEFMINKEYPAGE;
-		b.prefix = __bt_defpfx;
-		b.psize = 0;
-	}
-
-	/* Check for the ubiquitous PDP-11. */
-	if (b.lorder != BIG_ENDIAN && b.lorder != LITTLE_ENDIAN)
-		goto einval;
-
-	/* Allocate and initialize DB and BTREE structures. */
-	if ((t = (BTREE *)malloc(sizeof(BTREE))) == NULL)
-		goto err;
-	memset(t, 0, sizeof(BTREE));
-	t->bt_fd = -1;			/* Don't close unopened fd on error. */
-	t->bt_lorder = b.lorder;
-	t->bt_order = NOT;
-	t->bt_cmp = b.compare;
-	t->bt_pfx = b.prefix;
-	t->bt_rfd = -1;
-
-	if ((t->bt_dbp = dbp = (DB *)malloc(sizeof(DB))) == NULL)
-		goto err;
-	memset(t->bt_dbp, 0, sizeof(DB));
-	if (t->bt_lorder != machine_lorder)
-		F_SET(t, B_NEEDSWAP);
-
-	dbp->type = DB_BTREE;
-	dbp->internal = t;
-	dbp->close = __bt_close;
-	dbp->del = __bt_delete;
-	dbp->fd = __bt_fd;
-	dbp->get = __bt_get;
-	dbp->put = __bt_put;
-	dbp->seq = __bt_seq;
-	dbp->sync = __bt_sync;
-
-	/*
-	 * If no file name was supplied, this is an in-memory btree and we
-	 * open a backing temporary file.  Otherwise, it's a disk-based tree.
-	 */
-	if (fname) {
-		switch (flags & O_ACCMODE) {
-		case O_RDONLY:
-			F_SET(t, B_RDONLY);
-			break;
-		case O_RDWR:
-			break;
-		case O_WRONLY:
-		default:
-			goto einval;
-		}
-
-		if ((t->bt_fd = open(fname, flags, mode)) < 0)
-			goto err;
-
-	} else {
-		if ((flags & O_ACCMODE) != O_RDWR)
-			goto einval;
-		if ((t->bt_fd = tmp()) == -1)
-			goto err;
-		F_SET(t, B_INMEM);
-	}
-
-	if (fcntl(t->bt_fd, F_SETFD, 1) == -1)
-		goto err;
-
-	if (fstat(t->bt_fd, &sb))
-		goto err;
-	if (sb.st_size) {
-		if ((nr = read(t->bt_fd, &m, sizeof(BTMETA))) < 0)
-			goto err;
-		if (nr != sizeof(BTMETA))
-			goto eftype;
-
-		/*
-		 * Read in the meta-data.  This can change the notion of what
-		 * the lorder, page size and flags are, and, when the page size
-		 * changes, the cachesize value can change too.  If the user
-		 * specified the wrong byte order for an existing database, we
-		 * don't bother to return an error, we just clear the NEEDSWAP
-		 * bit.
-		 */
-		if (m.magic == BTREEMAGIC)
-			F_CLR(t, B_NEEDSWAP);
-		else {
-			F_SET(t, B_NEEDSWAP);
-			M_32_SWAP(m.magic);
-			M_32_SWAP(m.version);
-			M_32_SWAP(m.psize);
-			M_32_SWAP(m.free);
-			M_32_SWAP(m.nrecs);
-			M_32_SWAP(m.flags);
-		}
-		if (m.magic != BTREEMAGIC || m.version != BTREEVERSION)
-			goto eftype;
-		if (m.psize < MINPSIZE || m.psize > MAX_PAGE_OFFSET + 1 ||
-		    m.psize & (sizeof(indx_t) - 1))
-			goto eftype;
-		if (m.flags & ~SAVEMETA)
-			goto eftype;
-		b.psize = m.psize;
-		F_SET(t, m.flags);
-		t->bt_free = m.free;
-		t->bt_nrecs = m.nrecs;
-	} else {
-		/*
-		 * Set the page size to the best value for I/O to this file.
-		 * Don't overflow the page offset type.
-		 */
-		if (b.psize == 0) {
-#ifdef _STATBUF_ST_BLKSIZE
-			b.psize = sb.st_blksize;
-#endif
-			if (b.psize < MINPSIZE)
-				b.psize = MINPSIZE;
-			if (b.psize > MAX_PAGE_OFFSET + 1)
-				b.psize = MAX_PAGE_OFFSET + 1;
-		}
-
-		/* Set flag if duplicates permitted. */
-		if (!(b.flags & R_DUP))
-			F_SET(t, B_NODUPS);
-
-		t->bt_free = P_INVALID;
-		t->bt_nrecs = 0;
-		F_SET(t, B_METADIRTY);
-	}
-
-	t->bt_psize = b.psize;
-
-	/* Set the cache size; must be a multiple of the page size. */
-	if (b.cachesize && b.cachesize & (b.psize - 1))
-		b.cachesize += (~b.cachesize & (b.psize - 1)) + 1;
-	if (b.cachesize < b.psize * MINCACHE)
-		b.cachesize = b.psize * MINCACHE;
-
-	/* Calculate number of pages to cache. */
-	ncache = (b.cachesize + t->bt_psize - 1) / t->bt_psize;
-
-	/*
-	 * The btree data structure requires that at least two keys can fit on
-	 * a page, but other than that there's no fixed requirement.  The user
-	 * specified a minimum number per page, and we translated that into the
-	 * number of bytes a key/data pair can use before being placed on an
-	 * overflow page.  This calculation includes the page header, the size
-	 * of the index referencing the leaf item and the size of the leaf item
-	 * structure.  Also, don't let the user specify a minkeypage such that
-	 * a key/data pair won't fit even if both key and data are on overflow
-	 * pages.
-	 */
-	t->bt_ovflsize = (t->bt_psize - BTDATAOFF) / b.minkeypage -
-	    (sizeof(indx_t) + NBLEAFDBT(0, 0));
-	if (t->bt_ovflsize < NBLEAFDBT(NOVFLSIZE, NOVFLSIZE) + sizeof(indx_t))
-		t->bt_ovflsize =
-		    NBLEAFDBT(NOVFLSIZE, NOVFLSIZE) + sizeof(indx_t);
-
-	/* Initialize the buffer pool. */
-	if ((t->bt_mp =
-	    mpool_open(NULL, t->bt_fd, t->bt_psize, ncache)) == NULL)
-		goto err;
-	if (!F_ISSET(t, B_INMEM))
-		mpool_filter(t->bt_mp, __bt_pgin, __bt_pgout, t);
-
-	/* Create a root page if new tree. */
-	if (nroot(t) == RET_ERROR)
-		goto err;
-
-	/* Global flags. */
-	if (dflags & DB_LOCK)
-		F_SET(t, B_DB_LOCK);
-	if (dflags & DB_SHMEM)
-		F_SET(t, B_DB_SHMEM);
-	if (dflags & DB_TXN)
-		F_SET(t, B_DB_TXN);
-
-	return (dbp);
-
-einval:	errno = EINVAL;
-	goto err;
-
-eftype:	errno = EFTYPE;
-	goto err;
-
-err:	if (t) {
-		if (t->bt_dbp)
-			free(t->bt_dbp);
-		if (t->bt_fd != -1)
-			(void)close(t->bt_fd);
-		free(t);
-	}
-	return (NULL);
-}
-
-/*
- * NROOT -- Create the root of a new tree.
- *
- * Parameters:
- *	t:	tree
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS
- */
-static int
-nroot(t)
-	BTREE *t;
-{
-	PAGE *meta, *root;
-	pgno_t npg;
-
-	if ((meta = mpool_get(t->bt_mp, 0, 0)) != NULL) {
-		mpool_put(t->bt_mp, meta, 0);
-		return (RET_SUCCESS);
-	}
-	if (errno != EINVAL)		/* It's OK to not exist. */
-		return (RET_ERROR);
-	errno = 0;
-
-	if ((meta = mpool_new(t->bt_mp, &npg)) == NULL)
-		return (RET_ERROR);
-
-	if ((root = mpool_new(t->bt_mp, &npg)) == NULL)
-		return (RET_ERROR);
-
-	if (npg != P_ROOT)
-		return (RET_ERROR);
-	root->pgno = npg;
-	root->prevpg = root->nextpg = P_INVALID;
-	root->lower = BTDATAOFF;
-	root->upper = t->bt_psize;
-	root->flags = P_BLEAF;
-	memset(meta, 0, t->bt_psize);
-	mpool_put(t->bt_mp, meta, MPOOL_DIRTY);
-	mpool_put(t->bt_mp, root, MPOOL_DIRTY);
-	return (RET_SUCCESS);
-}
-
-static int
-tmp()
-{
-	sigset_t set, oset;
-	int fd;
-	const char *envtmp;
-	char *path;
-	static const char fmt[] = "%s/bt.XXXXXX";
-	size_t n;
-
-	envtmp = getenv("TMPDIR");
-	if (!envtmp)
-	  envtmp = "/tmp";
-	n = strlen (envtmp) + sizeof fmt;
-#ifdef	__GNUC__
-	path = __builtin_alloca(n);
-#else
-	path = malloc(n);
-#endif
-	(void)snprintf(path, n, fmt, envtmp ? envtmp : "/tmp");
-
-	(void)sigfillset(&set);
-	(void)sigprocmask(SIG_BLOCK, &set, &oset);
-	if ((fd = mkstemp(path)) != -1)
-		(void)unlink(path);
-	(void)sigprocmask(SIG_SETMASK, &oset, NULL);
-#ifndef	__GNUC__
-	free(path);
-#endif
-	return(fd);
-}
-
-static int
-byteorder()
-{
-	u_int32_t x;
-	u_char *p;
-
-	x = 0x01020304;
-	p = (u_char *)&x;
-	switch (*p) {
-	case 1:
-		return (BIG_ENDIAN);
-	case 4:
-		return (LITTLE_ENDIAN);
-	default:
-		return (0);
-	}
-}
-
-int
-__bt_fd(dbp)
-        const DB *dbp;
-{
-	BTREE *t;
-
-	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;
-	}
-
-	/* In-memory database can't have a file descriptor. */
-	if (F_ISSET(t, B_INMEM)) {
-		errno = ENOENT;
-		return (-1);
-	}
-	return (t->bt_fd);
-}
diff --git a/db/btree/bt_overflow.c b/db/btree/bt_overflow.c
deleted file mode 100644
index b28b8e0..0000000
--- a/db/btree/bt_overflow.c
+++ /dev/null
@@ -1,228 +0,0 @@
-/*-
- * 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. 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[] = "@(#)bt_overflow.c	8.5 (Berkeley) 7/16/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/param.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <db.h>
-#include "btree.h"
-
-/*
- * Big key/data code.
- *
- * Big key and data entries are stored on linked lists of pages.  The initial
- * reference is byte string stored with the key or data and is the page number
- * and size.  The actual record is stored in a chain of pages linked by the
- * nextpg field of the PAGE header.
- *
- * The first page of the chain has a special property.  If the record is used
- * by an internal page, it cannot be deleted and the P_PRESERVE bit will be set
- * in the header.
- *
- * XXX
- * A single DBT is written to each chain, so a lot of space on the last page
- * is wasted.  This is a fairly major bug for some data sets.
- */
-
-/*
- * __OVFL_GET -- Get an overflow key/data item.
- *
- * Parameters:
- *	t:	tree
- *	p:	pointer to { pgno_t, u_int32_t }
- *	buf:	storage address
- *	bufsz:	storage size
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS
- */
-int
-__ovfl_get(t, p, ssz, buf, bufsz)
-	BTREE *t;
-	void *p;
-	size_t *ssz;
-	void **buf;
-	size_t *bufsz;
-{
-	PAGE *h;
-	pgno_t pg;
-	size_t nb, plen;
-	u_int32_t sz;
-
-	memmove(&pg, p, sizeof(pgno_t));
-	memmove(&sz, (char *)p + sizeof(pgno_t), sizeof(u_int32_t));
-	*ssz = sz;
-
-#ifdef DEBUG
-	if (pg == P_INVALID || sz == 0)
-		abort();
-#endif
-	/* Make the buffer bigger as necessary. */
-	if (*bufsz < sz) {
-		*buf = (char *)(*buf == NULL ? malloc(sz) : realloc(*buf, sz));
-		if (*buf == NULL)
-			return (RET_ERROR);
-		*bufsz = sz;
-	}
-
-	/*
-	 * Step through the linked list of pages, copying the data on each one
-	 * into the buffer.  Never copy more than the data's length.
-	 */
-	plen = t->bt_psize - BTDATAOFF;
-	for (p = *buf;; p = (char *)p + nb, pg = h->nextpg) {
-		if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
-			return (RET_ERROR);
-
-		nb = MIN(sz, plen);
-		memmove(p, (char *)h + BTDATAOFF, nb);
-		mpool_put(t->bt_mp, h, 0);
-
-		if ((sz -= nb) == 0)
-			break;
-	}
-	return (RET_SUCCESS);
-}
-
-/*
- * __OVFL_PUT -- Store an overflow key/data item.
- *
- * Parameters:
- *	t:	tree
- *	data:	DBT to store
- *	pgno:	storage page number
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS
- */
-int
-__ovfl_put(t, dbt, pg)
-	BTREE *t;
-	const DBT *dbt;
-	pgno_t *pg;
-{
-	PAGE *h, *last;
-	void *p;
-	pgno_t npg;
-	size_t nb, plen;
-	u_int32_t sz;
-
-	/*
-	 * Allocate pages and copy the key/data record into them.  Store the
-	 * number of the first page in the chain.
-	 */
-	plen = t->bt_psize - BTDATAOFF;
-	for (last = NULL, p = dbt->data, sz = dbt->size;;
-	    p = (char *)p + plen, last = h) {
-		if ((h = __bt_new(t, &npg)) == NULL)
-			return (RET_ERROR);
-
-		h->pgno = npg;
-		h->nextpg = h->prevpg = P_INVALID;
-		h->flags = P_OVERFLOW;
-		h->lower = h->upper = 0;
-
-		nb = MIN(sz, plen);
-		memmove((char *)h + BTDATAOFF, p, nb);
-
-		if (last) {
-			last->nextpg = h->pgno;
-			mpool_put(t->bt_mp, last, MPOOL_DIRTY);
-		} else
-			*pg = h->pgno;
-
-		if ((sz -= nb) == 0) {
-			mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-			break;
-		}
-	}
-	return (RET_SUCCESS);
-}
-
-/*
- * __OVFL_DELETE -- Delete an overflow chain.
- *
- * Parameters:
- *	t:	tree
- *	p:	pointer to { pgno_t, u_int32_t }
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS
- */
-int
-__ovfl_delete(t, p)
-	BTREE *t;
-	void *p;
-{
-	PAGE *h;
-	pgno_t pg;
-	size_t plen;
-	u_int32_t sz;
-
-	memmove(&pg, p, sizeof(pgno_t));
-	memmove(&sz, (char *)p + sizeof(pgno_t), sizeof(u_int32_t));
-
-#ifdef DEBUG
-	if (pg == P_INVALID || sz == 0)
-		abort();
-#endif
-	if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
-		return (RET_ERROR);
-
-	/* Don't delete chains used by internal pages. */
-	if (h->flags & P_PRESERVE) {
-		mpool_put(t->bt_mp, h, 0);
-		return (RET_SUCCESS);
-	}
-
-	/* Step through the chain, calling the free routine for each page. */
-	for (plen = t->bt_psize - BTDATAOFF;; sz -= plen) {
-		pg = h->nextpg;
-		__bt_free(t, h);
-		if (sz <= plen)
-			break;
-		if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
-			return (RET_ERROR);
-	}
-	return (RET_SUCCESS);
-}
diff --git a/db/btree/bt_page.c b/db/btree/bt_page.c
deleted file mode 100644
index ce9cbf1..0000000
--- a/db/btree/bt_page.c
+++ /dev/null
@@ -1,100 +0,0 @@
-/*-
- * 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[] = "@(#)bt_page.c	8.3 (Berkeley) 7/14/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <stdio.h>
-
-#include <db.h>
-#include "btree.h"
-
-/*
- * __bt_free --
- *	Put a page on the freelist.
- *
- * Parameters:
- *	t:	tree
- *	h:	page to free
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS
- *
- * Side-effect:
- *	mpool_put's the page.
- */
-int
-__bt_free(t, h)
-	BTREE *t;
-	PAGE *h;
-{
-	/* Insert the page at the head of the free list. */
-	h->prevpg = P_INVALID;
-	h->nextpg = t->bt_free;
-	t->bt_free = h->pgno;
-	F_SET(t, B_METADIRTY);
-
-	/* Make sure the page gets written back. */
-	return (mpool_put(t->bt_mp, h, MPOOL_DIRTY));
-}
-
-/*
- * __bt_new --
- *	Get a new page, preferably from the freelist.
- *
- * Parameters:
- *	t:	tree
- *	npg:	storage for page number.
- *
- * Returns:
- *	Pointer to a page, NULL on error.
- */
-PAGE *
-__bt_new(t, npg)
-	BTREE *t;
-	pgno_t *npg;
-{
-	PAGE *h;
-
-	if (t->bt_free != P_INVALID &&
-	    (h = mpool_get(t->bt_mp, t->bt_free, 0)) != NULL) {
-		*npg = t->bt_free;
-		t->bt_free = h->nextpg;
-		F_SET(t, B_METADIRTY);
-		return (h);
-	}
-	return (mpool_new(t->bt_mp, npg));
-}
diff --git a/db/btree/bt_put.c b/db/btree/bt_put.c
deleted file mode 100644
index 15309c6..0000000
--- a/db/btree/bt_put.c
+++ /dev/null
@@ -1,321 +0,0 @@
-/*-
- * 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. 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[] = "@(#)bt_put.c	8.8 (Berkeley) 7/26/94";
-#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 "btree.h"
-
-static EPG *bt_fast __P((BTREE *, const DBT *, const DBT *, int *));
-
-/*
- * __BT_PUT -- Add a btree item to the tree.
- *
- * Parameters:
- *	dbp:	pointer to access method
- *	key:	key
- *	data:	data
- *	flag:	R_NOOVERWRITE
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key is already in the
- *	tree and R_NOOVERWRITE specified.
- */
-int
-__bt_put(dbp, key, data, flags)
-	const DB *dbp;
-	DBT *key;
-	const DBT *data;
-	u_int flags;
-{
-	BTREE *t;
-	DBT tkey, tdata;
-	EPG *e;
-	PAGE *h;
-	indx_t index, nxtindex;
-	pgno_t pg;
-	u_int32_t nbytes;
-	int dflags, exact, status;
-	char *dest, db[NOVFLSIZE], kb[NOVFLSIZE];
-
-	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;
-	}
-
-	/* Check for change to a read-only tree. */
-	if (F_ISSET(t, B_RDONLY)) {
-		errno = EPERM;
-		return (RET_ERROR);
-	}
-
-	switch (flags) {
-	case 0:
-	case R_NOOVERWRITE:
-		break;
-	case R_CURSOR:
-		/*
-		 * If flags is R_CURSOR, put the cursor.  Must already
-		 * have started a scan and not have already deleted it.
-		 */
-		if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
-		    !F_ISSET(&t->bt_cursor,
-		        CURS_ACQUIRE | CURS_AFTER | CURS_BEFORE))
-			break;
-		/* FALLTHROUGH */
-	default:
-		errno = EINVAL;
-		return (RET_ERROR);
-	}
-
-	/*
-	 * If the key/data pair won't fit on a page, store it on overflow
-	 * pages.  Only put the key on the overflow page if the pair are
-	 * still too big after moving the data to an overflow page.
-	 *
-	 * XXX
-	 * If the insert fails later on, the overflow pages aren't recovered.
-	 */
-	dflags = 0;
-	if (key->size + data->size > t->bt_ovflsize) {
-		if (key->size > t->bt_ovflsize) {
-storekey:		if (__ovfl_put(t, key, &pg) == RET_ERROR)
-				return (RET_ERROR);
-			tkey.data = kb;
-			tkey.size = NOVFLSIZE;
-			memmove(kb, &pg, sizeof(pgno_t));
-			memmove(kb + sizeof(pgno_t),
-			    &key->size, sizeof(u_int32_t));
-			dflags |= P_BIGKEY;
-			key = &tkey;
-		}
-		if (key->size + data->size > t->bt_ovflsize) {
-			if (__ovfl_put(t, data, &pg) == RET_ERROR)
-				return (RET_ERROR);
-			tdata.data = db;
-			tdata.size = NOVFLSIZE;
-			memmove(db, &pg, sizeof(pgno_t));
-			memmove(db + sizeof(pgno_t),
-			    &data->size, sizeof(u_int32_t));
-			dflags |= P_BIGDATA;
-			data = &tdata;
-		}
-		if (key->size + data->size > t->bt_ovflsize)
-			goto storekey;
-	}
-
-	/* Replace the cursor. */
-	if (flags == R_CURSOR) {
-		if ((h = mpool_get(t->bt_mp, t->bt_cursor.pg.pgno, 0)) == NULL)
-			return (RET_ERROR);
-		index = t->bt_cursor.pg.index;
-		goto delete;
-	}
-
-	/*
-	 * Find the key to delete, or, the location at which to insert.
-	 * Bt_fast and __bt_search both pin the returned page.
-	 */
-	if (t->bt_order == NOT || (e = bt_fast(t, key, data, &exact)) == NULL)
-		if ((e = __bt_search(t, key, &exact)) == NULL)
-			return (RET_ERROR);
-	h = e->page;
-	index = e->index;
-
-	/*
-	 * Add the key/data pair to the tree.  If an identical key is already
-	 * in the tree, and R_NOOVERWRITE is set, an error is returned.  If
-	 * R_NOOVERWRITE is not set, the key is either added (if duplicates are
-	 * permitted) or an error is returned.
-	 */
-	switch (flags) {
-	case R_NOOVERWRITE:
-		if (!exact)
-			break;
-		mpool_put(t->bt_mp, h, 0);
-		return (RET_SPECIAL);
-	default:
-		if (!exact || !F_ISSET(t, B_NODUPS))
-			break;
-		/*
-		 * !!!
-		 * Note, the delete may empty the page, so we need to put a
-		 * new entry into the page immediately.
-		 */
-delete:		if (__bt_dleaf(t, key, h, index) == RET_ERROR) {
-			mpool_put(t->bt_mp, h, 0);
-			return (RET_ERROR);
-		}
-		break;
-	}
-
-	/*
-	 * If not enough room, or the user has put a ceiling on the number of
-	 * keys permitted in the page, 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 = NBLEAFDBT(key->size, data->size);
-	if ((u_int32_t) (h->upper - h->lower) < nbytes + sizeof(indx_t)) {
-		if ((status = __bt_split(t, h, key,
-		    data, dflags, nbytes, index)) != RET_SUCCESS)
-			return (status);
-		goto success;
-	}
-
-	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_BLEAF(dest, key, data, dflags);
-
-	/* If the cursor is on this page, adjust it as necessary. */
-	if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
-	    !F_ISSET(&t->bt_cursor, CURS_ACQUIRE) &&
-	    t->bt_cursor.pg.pgno == h->pgno && t->bt_cursor.pg.index >= index)
-		++t->bt_cursor.pg.index;
-
-	if (t->bt_order == NOT) {
-		if (h->nextpg == P_INVALID) {
-			if (index == NEXTINDEX(h) - 1) {
-				t->bt_order = FORWARD;
-				t->bt_last.index = index;
-				t->bt_last.pgno = h->pgno;
-			}
-		} else if (h->prevpg == P_INVALID) {
-			if (index == 0) {
-				t->bt_order = BACK;
-				t->bt_last.index = 0;
-				t->bt_last.pgno = h->pgno;
-			}
-		}
-	}
-
-	mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-
-success:
-	if (flags == R_SETCURSOR)
-		__bt_setcur(t, e->page->pgno, e->index);
-
-	F_SET(t, B_MODIFIED);
-	return (RET_SUCCESS);
-}
-
-#ifdef STATISTICS
-u_long bt_cache_hit, bt_cache_miss;
-#endif
-
-/*
- * BT_FAST -- Do a quick check for sorted data.
- *
- * Parameters:
- *	t:	tree
- *	key:	key to insert
- *
- * Returns:
- * 	EPG for new record or NULL if not found.
- */
-static EPG *
-bt_fast(t, key, data, exactp)
-	BTREE *t;
-	const DBT *key, *data;
-	int *exactp;
-{
-	PAGE *h;
-	u_int32_t nbytes;
-	int cmp;
-
-	if ((h = mpool_get(t->bt_mp, t->bt_last.pgno, 0)) == NULL) {
-		t->bt_order = NOT;
-		return (NULL);
-	}
-	t->bt_cur.page = h;
-	t->bt_cur.index = t->bt_last.index;
-
-	/*
-	 * If won't fit in this page or have too many keys in this page,
-	 * have to search to get split stack.
-	 */
-	nbytes = NBLEAFDBT(key->size, data->size);
-	if ((u_int32_t) (h->upper - h->lower) < nbytes + sizeof(indx_t))
-		goto miss;
-
-	if (t->bt_order == FORWARD) {
-		if (t->bt_cur.page->nextpg != P_INVALID)
-			goto miss;
-		if (t->bt_cur.index != NEXTINDEX(h) - 1)
-			goto miss;
-		if ((cmp = __bt_cmp(t, key, &t->bt_cur)) < 0)
-			goto miss;
-		t->bt_last.index = cmp ? ++t->bt_cur.index : t->bt_cur.index;
-	} else {
-		if (t->bt_cur.page->prevpg != P_INVALID)
-			goto miss;
-		if (t->bt_cur.index != 0)
-			goto miss;
-		if ((cmp = __bt_cmp(t, key, &t->bt_cur)) > 0)
-			goto miss;
-		t->bt_last.index = 0;
-	}
-	*exactp = cmp == 0;
-#ifdef STATISTICS
-	++bt_cache_hit;
-#endif
-	return (&t->bt_cur);
-
-miss:
-#ifdef STATISTICS
-	++bt_cache_miss;
-#endif
-	t->bt_order = NOT;
-	mpool_put(t->bt_mp, h, 0);
-	return (NULL);
-}
diff --git a/db/btree/bt_search.c b/db/btree/bt_search.c
deleted file mode 100644
index 485afcb..0000000
--- a/db/btree/bt_search.c
+++ /dev/null
@@ -1,213 +0,0 @@
-/*-
- * 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. 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[] = "@(#)bt_search.c	8.8 (Berkeley) 7/31/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <stdio.h>
-
-#include <db.h>
-#include "btree.h"
-
-static int __bt_snext __P((BTREE *, PAGE *, const DBT *, int *));
-static int __bt_sprev __P((BTREE *, PAGE *, const DBT *, int *));
-
-/*
- * __bt_search --
- *	Search a btree for a key.
- *
- * Parameters:
- *	t:	tree to search
- *	key:	key to find
- *	exactp:	pointer to exact match flag
- *
- * Returns:
- *	The EPG for matching record, if any, or the EPG for the location
- *	of the key, if it were inserted into the tree, is entered into
- *	the bt_cur field of the tree.  A pointer to the field is returned.
- */
-EPG *
-__bt_search(t, key, exactp)
-	BTREE *t;
-	const DBT *key;
-	int *exactp;
-{
-	PAGE *h;
-	indx_t base, index, lim;
-	pgno_t pg;
-	int cmp;
-
-	BT_CLR(t);
-	for (pg = P_ROOT;;) {
-		if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
-			return (NULL);
-
-		/* Do a binary search on the current page. */
-		t->bt_cur.page = h;
-		for (base = 0, lim = NEXTINDEX(h); lim; lim >>= 1) {
-			t->bt_cur.index = index = base + (lim >> 1);
-			if ((cmp = __bt_cmp(t, key, &t->bt_cur)) == 0) {
-				if (h->flags & P_BLEAF) {
-					*exactp = 1;
-					return (&t->bt_cur);
-				}
-				goto next;
-			}
-			if (cmp > 0) {
-				base = index + 1;
-				--lim;
-			}
-		}
-
-		/*
-		 * If it's a leaf page, we're almost done.  If no duplicates
-		 * are allowed, or we have an exact match, we're done.  Else,
-		 * it's possible that there were matching keys on this page,
-		 * which later deleted, and we're on a page with no matches
-		 * while there are matches on other pages.  If at the start or
-		 * end of a page, check the adjacent page.
-		 */
-		if (h->flags & P_BLEAF) {
-			if (!F_ISSET(t, B_NODUPS)) {
-				if (base == 0 &&
-				    h->prevpg != P_INVALID &&
-				    __bt_sprev(t, h, key, exactp))
-					return (&t->bt_cur);
-				if (base == NEXTINDEX(h) &&
-				    h->nextpg != P_INVALID &&
-				    __bt_snext(t, h, key, exactp))
-					return (&t->bt_cur);
-			}
-			*exactp = 0;
-			t->bt_cur.index = base;
-			return (&t->bt_cur);
-		}
-
-		/*
-		 * No match found.  Base is the smallest index greater than
-		 * key and may be zero or a last + 1 index.  If it's non-zero,
-		 * decrement by one, and record the internal page which should
-		 * be a parent page for the key.  If a split later occurs, the
-		 * inserted page will be to the right of the saved page.
-		 */
-		index = base ? base - 1 : base;
-
-next:		BT_PUSH(t, h->pgno, index);
-		pg = GETBINTERNAL(h, index)->pgno;
-		mpool_put(t->bt_mp, h, 0);
-	}
-}
-
-/*
- * __bt_snext --
- *	Check for an exact match after the key.
- *
- * Parameters:
- *	t:	tree
- *	h:	current page
- *	key:	key
- *	exactp:	pointer to exact match flag
- *
- * Returns:
- *	If an exact match found.
- */
-static int
-__bt_snext(t, h, key, exactp)
-	BTREE *t;
-	PAGE *h;
-	const DBT *key;
-	int *exactp;
-{
-	EPG e;
-
-	/*
-	 * Get the next page.  The key is either an exact
-	 * match, or not as good as the one we already have.
-	 */
-	if ((e.page = mpool_get(t->bt_mp, h->nextpg, 0)) == NULL)
-		return (0);
-	e.index = 0;
-	if (__bt_cmp(t, key, &e) == 0) {
-		mpool_put(t->bt_mp, h, 0);
-		t->bt_cur = e;
-		*exactp = 1;
-		return (1);
-	}
-	mpool_put(t->bt_mp, e.page, 0);
-	return (0);
-}
-
-/*
- * __bt_sprev --
- *	Check for an exact match before the key.
- *
- * Parameters:
- *	t:	tree
- *	h:	current page
- *	key:	key
- *	exactp:	pointer to exact match flag
- *
- * Returns:
- *	If an exact match found.
- */
-static int
-__bt_sprev(t, h, key, exactp)
-	BTREE *t;
-	PAGE *h;
-	const DBT *key;
-	int *exactp;
-{
-	EPG e;
-
-	/*
-	 * Get the previous page.  The key is either an exact
-	 * match, or not as good as the one we already have.
-	 */
-	if ((e.page = mpool_get(t->bt_mp, h->prevpg, 0)) == NULL)
-		return (0);
-	e.index = NEXTINDEX(e.page) - 1;
-	if (__bt_cmp(t, key, &e) == 0) {
-		mpool_put(t->bt_mp, h, 0);
-		t->bt_cur = e;
-		*exactp = 1;
-		return (1);
-	}
-	mpool_put(t->bt_mp, e.page, 0);
-	return (0);
-}
diff --git a/db/btree/bt_seq.c b/db/btree/bt_seq.c
deleted file mode 100644
index 90f8960..0000000
--- a/db/btree/bt_seq.c
+++ /dev/null
@@ -1,460 +0,0 @@
-/*-
- * 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. 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[] = "@(#)bt_seq.c	8.7 (Berkeley) 7/20/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <errno.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#include <db.h>
-#include "btree.h"
-
-static int __bt_first __P((BTREE *, const DBT *, EPG *, int *));
-static int __bt_seqadv __P((BTREE *, EPG *, int));
-static int __bt_seqset __P((BTREE *, EPG *, DBT *, int));
-
-/*
- * Sequential scan support.
- *
- * The tree can be scanned sequentially, starting from either end of the
- * tree or from any specific key.  A scan request before any scanning is
- * done is initialized as starting from the least node.
- */
-
-/*
- * __bt_seq --
- *	Btree sequential scan interface.
- *
- * Parameters:
- *	dbp:	pointer to access method
- *	key:	key for positioning and return value
- *	data:	data return value
- *	flags:	R_CURSOR, R_FIRST, R_LAST, R_NEXT, R_PREV.
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS or RET_SPECIAL if there's no next key.
- */
-int
-__bt_seq(dbp, key, data, flags)
-	const DB *dbp;
-	DBT *key, *data;
-	u_int flags;
-{
-	BTREE *t;
-	EPG e;
-	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 scan uninitialized as yet, or starting at a specific record, set
-	 * the scan to a specific key.  Both __bt_seqset and __bt_seqadv pin
-	 * the page the cursor references if they're successful.
-	 */
-	switch (flags) {
-	case R_NEXT:
-	case R_PREV:
-		if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
-			status = __bt_seqadv(t, &e, flags);
-			break;
-		}
-		/* FALLTHROUGH */
-	case R_FIRST:
-	case R_LAST:
-	case R_CURSOR:
-		status = __bt_seqset(t, &e, key, flags);
-		break;
-	default:
-		errno = EINVAL;
-		return (RET_ERROR);
-	}
-
-	if (status == RET_SUCCESS) {
-		__bt_setcur(t, e.page->pgno, e.index);
-
-		status =
-		    __bt_ret(t, &e, key, &t->bt_rkey, 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);
-}
-
-/*
- * __bt_seqset --
- *	Set the sequential scan to a specific key.
- *
- * Parameters:
- *	t:	tree
- *	ep:	storage for returned key
- *	key:	key for initial scan position
- *	flags:	R_CURSOR, R_FIRST, R_LAST, R_NEXT, R_PREV
- *
- * Side effects:
- *	Pins the page the cursor references.
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS or RET_SPECIAL if there's no next key.
- */
-static int
-__bt_seqset(t, ep, key, flags)
-	BTREE *t;
-	EPG *ep;
-	DBT *key;
-	int flags;
-{
-	PAGE *h;
-	pgno_t pg;
-	int exact;
-
-	/*
-	 * Find the first, last or specific key in the tree and point the
-	 * cursor at it.  The cursor may not be moved until a new key has
-	 * been found.
-	 */
-	switch (flags) {
-	case R_CURSOR:				/* Keyed scan. */
-		/*
-		 * Find the first instance of the key or the smallest key
-		 * which is greater than or equal to the specified key.
-		 */
-		if (key->data == NULL || key->size == 0) {
-			errno = EINVAL;
-			return (RET_ERROR);
-		}
-		return (__bt_first(t, key, ep, &exact));
-	case R_FIRST:				/* First record. */
-	case R_NEXT:
-		/* Walk down the left-hand side of the tree. */
-		for (pg = P_ROOT;;) {
-			if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
-				return (RET_ERROR);
-
-			/* Check for an empty tree. */
-			if (NEXTINDEX(h) == 0) {
-				mpool_put(t->bt_mp, h, 0);
-				return (RET_SPECIAL);
-			}
-
-			if (h->flags & (P_BLEAF | P_RLEAF))
-				break;
-			pg = GETBINTERNAL(h, 0)->pgno;
-			mpool_put(t->bt_mp, h, 0);
-		}
-		ep->page = h;
-		ep->index = 0;
-		break;
-	case R_LAST:				/* Last record. */
-	case R_PREV:
-		/* Walk down the right-hand side of the tree. */
-		for (pg = P_ROOT;;) {
-			if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
-				return (RET_ERROR);
-
-			/* Check for an empty tree. */
-			if (NEXTINDEX(h) == 0) {
-				mpool_put(t->bt_mp, h, 0);
-				return (RET_SPECIAL);
-			}
-
-			if (h->flags & (P_BLEAF | P_RLEAF))
-				break;
-			pg = GETBINTERNAL(h, NEXTINDEX(h) - 1)->pgno;
-			mpool_put(t->bt_mp, h, 0);
-		}
-
-		ep->page = h;
-		ep->index = NEXTINDEX(h) - 1;
-		break;
-	}
-	return (RET_SUCCESS);
-}
-
-/*
- * __bt_seqadvance --
- *	Advance the sequential scan.
- *
- * Parameters:
- *	t:	tree
- *	flags:	R_NEXT, R_PREV
- *
- * Side effects:
- *	Pins the page the new key/data record is on.
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS or RET_SPECIAL if there's no next key.
- */
-static int
-__bt_seqadv(t, ep, flags)
-	BTREE *t;
-	EPG *ep;
-	int flags;
-{
-	CURSOR *c;
-	PAGE *h;
-	indx_t index;
-	pgno_t pg;
-	int exact;
-
-	/*
-	 * There are a couple of states that we can be in.  The cursor has
-	 * been initialized by the time we get here, but that's all we know.
-	 */
-	c = &t->bt_cursor;
-
-	/*
-	 * The cursor was deleted where there weren't any duplicate records,
-	 * so the key was saved.  Find out where that key would go in the
-	 * current tree.  It doesn't matter if the returned key is an exact
-	 * match or not -- if it's an exact match, the record was added after
-	 * the delete so we can just return it.  If not, as long as there's
-	 * a record there, return it.
-	 */
-	if (F_ISSET(c, CURS_ACQUIRE))
-		return (__bt_first(t, &c->key, ep, &exact));
-
-	/* Get the page referenced by the cursor. */
-	if ((h = mpool_get(t->bt_mp, c->pg.pgno, 0)) == NULL)
-		return (RET_ERROR);
-
-	/*
- 	 * Find the next/previous record in the tree and point the cursor at
-	 * it.  The cursor may not be moved until a new key has been found.
-	 */
-	switch (flags) {
-	case R_NEXT:			/* Next record. */
-		/*
-		 * The cursor was deleted in duplicate records, and moved
-		 * forward to a record that has yet to be returned.  Clear
-		 * that flag, and return the record.
-		 */
-		if (F_ISSET(c, CURS_AFTER))
-			goto usecurrent;
-		index = c->pg.index;
-		if (++index == NEXTINDEX(h)) {
-			pg = h->nextpg;
-			mpool_put(t->bt_mp, h, 0);
-			if (pg == P_INVALID)
-				return (RET_SPECIAL);
-			if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
-				return (RET_ERROR);
-			index = 0;
-		}
-		break;
-	case R_PREV:			/* Previous record. */
-		/*
-		 * The cursor was deleted in duplicate records, and moved
-		 * backward to a record that has yet to be returned.  Clear
-		 * that flag, and return the record.
-		 */
-		if (F_ISSET(c, CURS_BEFORE)) {
-usecurrent:		F_CLR(c, CURS_AFTER | CURS_BEFORE);
-			ep->page = h;
-			ep->index = c->pg.index;
-			return (RET_SUCCESS);
-		}
-		index = c->pg.index;
-		if (index == 0) {
-			pg = h->prevpg;
-			mpool_put(t->bt_mp, h, 0);
-			if (pg == P_INVALID)
-				return (RET_SPECIAL);
-			if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
-				return (RET_ERROR);
-			index = NEXTINDEX(h) - 1;
-		} else
-			--index;
-		break;
-	}
-
-	ep->page = h;
-	ep->index = index;
-	return (RET_SUCCESS);
-}
-
-/*
- * __bt_first --
- *	Find the first entry.
- *
- * Parameters:
- *	t:	the tree
- *    key:	the key
- *  erval:	return EPG
- * exactp:	pointer to exact match flag
- *
- * Returns:
- *	The first entry in the tree greater than or equal to key,
- *	or RET_SPECIAL if no such key exists.
- */
-static int
-__bt_first(t, key, erval, exactp)
-	BTREE *t;
-	const DBT *key;
-	EPG *erval;
-	int *exactp;
-{
-	PAGE *h;
-	EPG *ep, save;
-	pgno_t pg;
-
-	/*
-	 * Find any matching record; __bt_search pins the page.
-	 *
-	 * If it's an exact match and duplicates are possible, walk backwards
-	 * in the tree until we find the first one.  Otherwise, make sure it's
-	 * a valid key (__bt_search may return an index just past the end of a
-	 * page) and return it.
-	 */
-	if ((ep = __bt_search(t, key, exactp)) == NULL)
-		return (RET_SPECIAL);
-	if (*exactp) {
-		if (F_ISSET(t, B_NODUPS)) {
-			*erval = *ep;
-			return (RET_SUCCESS);
-		}
-
-		/*
-		 * Walk backwards, as long as the entry matches and there are
-		 * keys left in the tree.  Save a copy of each match in case
-		 * we go too far.
-		 */
-		save = *ep;
-		h = ep->page;
-		do {
-			if (save.page->pgno != ep->page->pgno) {
-				mpool_put(t->bt_mp, save.page, 0);
-				save = *ep;
-			} else
-				save.index = ep->index;
-
-			/*
-			 * Don't unpin the page the last (or original) match
-			 * was on, but make sure it's unpinned if an error
-			 * occurs.
-			 */
-			if (ep->index == 0) {
-				if (h->prevpg == P_INVALID)
-					break;
-				if (h->pgno != save.page->pgno)
-					mpool_put(t->bt_mp, h, 0);
-				if ((h = mpool_get(t->bt_mp,
-				    h->prevpg, 0)) == NULL) {
-					if (h->pgno == save.page->pgno)
-						mpool_put(t->bt_mp,
-						    save.page, 0);
-					return (RET_ERROR);
-				}
-				ep->page = h;
-				ep->index = NEXTINDEX(h);
-			}
-			--ep->index;
-		} while (__bt_cmp(t, key, ep) == 0);
-
-		/*
-		 * Reach here with the last page that was looked at pinned,
-		 * which may or may not be the same as the last (or original)
-		 * match page.  If it's not useful, release it.
-		 */
-		if (h->pgno != save.page->pgno)
-			mpool_put(t->bt_mp, h, 0);
-
-		*erval = save;
-		return (RET_SUCCESS);
-	}
-
-	/* If at the end of a page, find the next entry. */
-	if (ep->index == NEXTINDEX(ep->page)) {
-		h = ep->page;
-		pg = h->nextpg;
-		mpool_put(t->bt_mp, h, 0);
-		if (pg == P_INVALID)
-			return (RET_SPECIAL);
-		if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
-			return (RET_ERROR);
-		ep->index = 0;
-		ep->page = h;
-	}
-	*erval = *ep;
-	return (RET_SUCCESS);
-}
-
-/*
- * __bt_setcur --
- *	Set the cursor to an entry in the tree.
- *
- * Parameters:
- *	t:	the tree
- *   pgno:	page number
- *  index:	page index
- */
-void
-__bt_setcur(t, pgno, index)
-	BTREE *t;
-	pgno_t pgno;
-	u_int index;
-{
-	/* Lose any already deleted key. */
-	if (t->bt_cursor.key.data != NULL) {
-		free(t->bt_cursor.key.data);
-		t->bt_cursor.key.size = 0;
-		t->bt_cursor.key.data = NULL;
-	}
-	F_CLR(&t->bt_cursor, CURS_ACQUIRE | CURS_AFTER | CURS_BEFORE);
-
-	/* Update the cursor. */
-	t->bt_cursor.pg.pgno = pgno;
-	t->bt_cursor.pg.index = index;
-	F_SET(&t->bt_cursor, CURS_INIT);
-}
diff --git a/db/btree/bt_split.c b/db/btree/bt_split.c
deleted file mode 100644
index 4119ccb..0000000
--- a/db/btree/bt_split.c
+++ /dev/null
@@ -1,829 +0,0 @@
-/*-
- * 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. 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[] = "@(#)bt_split.c	8.9 (Berkeley) 7/26/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/types.h>
-
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <db.h>
-#include "btree.h"
-
-static int	 bt_broot __P((BTREE *, PAGE *, PAGE *, PAGE *));
-static PAGE	*bt_page
-		    __P((BTREE *, PAGE *, PAGE **, PAGE **, indx_t *, size_t));
-static int	 bt_preserve __P((BTREE *, pgno_t));
-static PAGE	*bt_psplit
-		    __P((BTREE *, PAGE *, PAGE *, PAGE *, indx_t *, size_t));
-static PAGE	*bt_root
-		    __P((BTREE *, PAGE *, PAGE **, PAGE **, indx_t *, size_t));
-static int	 bt_rroot __P((BTREE *, PAGE *, PAGE *, PAGE *));
-static recno_t	 rec_total __P((PAGE *));
-
-#ifdef STATISTICS
-u_long	bt_rootsplit, bt_split, bt_sortsplit, bt_pfxsaved;
-#endif
-
-/*
- * __BT_SPLIT -- Split the tree.
- *
- * Parameters:
- *	t:	tree
- *	sp:	page to split
- *	key:	key to insert
- *	data:	data to insert
- *	flags:	BIGKEY/BIGDATA flags
- *	ilen:	insert length
- *	skip:	index to leave open
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS
- */
-int
-__bt_split(t, sp, key, data, flags, ilen, argskip)
-	BTREE *t;
-	PAGE *sp;
-	const DBT *key, *data;
-	int flags;
-	size_t ilen;
-	u_int32_t argskip;
-{
-	BINTERNAL *bi;
-	BLEAF *bl, *tbl;
-	DBT a, b;
-	EPGNO *parent;
-	PAGE *h, *l, *r, *lchild, *rchild;
-	indx_t nxtindex;
-	u_int16_t skip;
-	u_int32_t n, nbytes, nksize;
-	int parentsplit;
-	char *dest;
-
-	/*
-	 * Split the page into two pages, l and r.  The split routines return
-	 * a pointer to the page into which the key should be inserted and with
-	 * skip set to the offset which should be used.  Additionally, l and r
-	 * are pinned.
-	 */
-	skip = argskip;
-	h = sp->pgno == P_ROOT ?
-	    bt_root(t, sp, &l, &r, &skip, ilen) :
-	    bt_page(t, sp, &l, &r, &skip, ilen);
-	if (h == NULL)
-		return (RET_ERROR);
-
-	/*
-	 * Insert the new key/data pair into the leaf page.  (Key inserts
-	 * always cause a leaf page to split first.)
-	 */
-	h->linp[skip] = h->upper -= ilen;
-	dest = (char *)h + h->upper;
-	if (F_ISSET(t, R_RECNO))
-		WR_RLEAF(dest, data, flags)
-	else
-		WR_BLEAF(dest, key, data, flags)
-
-	/* If the root page was split, make it look right. */
-	if (sp->pgno == P_ROOT &&
-	    (F_ISSET(t, R_RECNO) ?
-	    bt_rroot(t, sp, l, r) : bt_broot(t, sp, l, r)) == RET_ERROR)
-		goto err2;
-
-	/*
-	 * Now we walk the parent page stack -- a LIFO stack of the pages that
-	 * were traversed when we searched for the page that split.  Each stack
-	 * entry is a page number and a page index offset.  The offset is for
-	 * the page traversed on the search.  We've just split a page, so we
-	 * have to insert a new key into the parent page.
-	 *
-	 * If the insert into the parent page causes it to split, may have to
-	 * continue splitting all the way up the tree.  We stop if the root
-	 * splits or the page inserted into didn't have to split to hold the
-	 * new key.  Some algorithms replace the key for the old page as well
-	 * as the new page.  We don't, as there's no reason to believe that the
-	 * first key on the old page is any better than the key we have, and,
-	 * in the case of a key being placed at index 0 causing the split, the
-	 * key is unavailable.
-	 *
-	 * There are a maximum of 5 pages pinned at any time.  We keep the left
-	 * and right pages pinned while working on the parent.   The 5 are the
-	 * two children, left parent and right parent (when the parent splits)
-	 * and the root page or the overflow key page when calling bt_preserve.
-	 * This code must make sure that all pins are released other than the
-	 * root page or overflow page which is unlocked elsewhere.
-	 */
-	while ((parent = BT_POP(t)) != NULL) {
-		lchild = l;
-		rchild = r;
-
-		/* Get the parent page. */
-		if ((h = mpool_get(t->bt_mp, parent->pgno, 0)) == NULL)
-			goto err2;
-
-	 	/*
-		 * The new key goes ONE AFTER the index, because the split
-		 * was to the right.
-		 */
-		skip = parent->index + 1;
-
-		/*
-		 * Calculate the space needed on the parent page.
-		 *
-		 * Prefix trees: space hack when inserting into BINTERNAL
-		 * pages.  Retain only what's needed to distinguish between
-		 * the new entry and the LAST entry on the page to its left.
-		 * If the keys compare equal, retain the entire key.  Note,
-		 * we don't touch overflow keys, and the entire key must be
-		 * retained for the next-to-left most key on the leftmost
-		 * page of each level, or the search will fail.  Applicable
-		 * ONLY to internal pages that have leaf pages as children.
-		 * Further reduction of the key between pairs of internal
-		 * pages loses too much information.
-		 */
-		switch (rchild->flags & P_TYPE) {
-		case P_BINTERNAL:
-			bi = GETBINTERNAL(rchild, 0);
-			nbytes = NBINTERNAL(bi->ksize);
-			break;
-		case P_BLEAF:
-			bl = GETBLEAF(rchild, 0);
-			nbytes = NBINTERNAL(bl->ksize);
-			if (t->bt_pfx && !(bl->flags & P_BIGKEY) &&
-			    (h->prevpg != P_INVALID || skip > 1)) {
-				tbl = GETBLEAF(lchild, NEXTINDEX(lchild) - 1);
-				a.size = tbl->ksize;
-				a.data = tbl->bytes;
-				b.size = bl->ksize;
-				b.data = bl->bytes;
-				nksize = t->bt_pfx(&a, &b);
-				n = NBINTERNAL(nksize);
-				if (n < nbytes) {
-#ifdef STATISTICS
-					bt_pfxsaved += nbytes - n;
-#endif
-					nbytes = n;
-				} else
-					nksize = 0;
-			} else
-				nksize = 0;
-			break;
-		case P_RINTERNAL:
-		case P_RLEAF:
-			nbytes = NRINTERNAL;
-			break;
-		default:
-			abort();
-		}
-
-		/* Split the parent page if necessary or shift the indices. */
-		if ((u_int32_t) (h->upper - h->lower)
-		    < nbytes + sizeof(indx_t)) {
-			sp = h;
-			h = h->pgno == P_ROOT ?
-			    bt_root(t, h, &l, &r, &skip, nbytes) :
-			    bt_page(t, h, &l, &r, &skip, nbytes);
-			if (h == NULL)
-				goto err1;
-			parentsplit = 1;
-		} else {
-			if (skip < (nxtindex = NEXTINDEX(h)))
-				memmove(h->linp + skip + 1, h->linp + skip,
-				    (nxtindex - skip) * sizeof(indx_t));
-			h->lower += sizeof(indx_t);
-			parentsplit = 0;
-		}
-
-		/* Insert the key into the parent page. */
-		switch (rchild->flags & P_TYPE) {
-		case P_BINTERNAL:
-			h->linp[skip] = h->upper -= nbytes;
-			dest = (char *)h + h->linp[skip];
-			memmove(dest, bi, nbytes);
-			((BINTERNAL *)dest)->pgno = rchild->pgno;
-			break;
-		case P_BLEAF:
-			h->linp[skip] = h->upper -= nbytes;
-			dest = (char *)h + h->linp[skip];
-			WR_BINTERNAL(dest, nksize ? nksize : bl->ksize,
-			    rchild->pgno, bl->flags & P_BIGKEY);
-			memmove(dest, bl->bytes, nksize ? nksize : bl->ksize);
-			if (bl->flags & P_BIGKEY &&
-			    bt_preserve(t, *(pgno_t *)bl->bytes) == RET_ERROR)
-				goto err1;
-			break;
-		case P_RINTERNAL:
-			/*
-			 * Update the left page count.  If split
-			 * added at index 0, fix the correct page.
-			 */
-			if (skip > 0)
-				dest = (char *)h + h->linp[skip - 1];
-			else
-				dest = (char *)l + l->linp[NEXTINDEX(l) - 1];
-			((RINTERNAL *)dest)->nrecs = rec_total(lchild);
-			((RINTERNAL *)dest)->pgno = lchild->pgno;
-
-			/* Update the right page count. */
-			h->linp[skip] = h->upper -= nbytes;
-			dest = (char *)h + h->linp[skip];
-			((RINTERNAL *)dest)->nrecs = rec_total(rchild);
-			((RINTERNAL *)dest)->pgno = rchild->pgno;
-			break;
-		case P_RLEAF:
-			/*
-			 * Update the left page count.  If split
-			 * added at index 0, fix the correct page.
-			 */
-			if (skip > 0)
-				dest = (char *)h + h->linp[skip - 1];
-			else
-				dest = (char *)l + l->linp[NEXTINDEX(l) - 1];
-			((RINTERNAL *)dest)->nrecs = NEXTINDEX(lchild);
-			((RINTERNAL *)dest)->pgno = lchild->pgno;
-
-			/* Update the right page count. */
-			h->linp[skip] = h->upper -= nbytes;
-			dest = (char *)h + h->linp[skip];
-			((RINTERNAL *)dest)->nrecs = NEXTINDEX(rchild);
-			((RINTERNAL *)dest)->pgno = rchild->pgno;
-			break;
-		default:
-			abort();
-		}
-
-		/* Unpin the held pages. */
-		if (!parentsplit) {
-			mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-			break;
-		}
-
-		/* If the root page was split, make it look right. */
-		if (sp->pgno == P_ROOT &&
-		    (F_ISSET(t, R_RECNO) ?
-		    bt_rroot(t, sp, l, r) : bt_broot(t, sp, l, r)) == RET_ERROR)
-			goto err1;
-
-		mpool_put(t->bt_mp, lchild, MPOOL_DIRTY);
-		mpool_put(t->bt_mp, rchild, MPOOL_DIRTY);
-	}
-
-	/* Unpin the held pages. */
-	mpool_put(t->bt_mp, l, MPOOL_DIRTY);
-	mpool_put(t->bt_mp, r, MPOOL_DIRTY);
-
-	/* Clear any pages left on the stack. */
-	return (RET_SUCCESS);
-
-	/*
-	 * If something fails in the above loop we were already walking back
-	 * up the tree and the tree is now inconsistent.  Nothing much we can
-	 * do about it but release any memory we're holding.
-	 */
-err1:	mpool_put(t->bt_mp, lchild, MPOOL_DIRTY);
-	mpool_put(t->bt_mp, rchild, MPOOL_DIRTY);
-
-err2:	mpool_put(t->bt_mp, l, 0);
-	mpool_put(t->bt_mp, r, 0);
-	__dbpanic(t->bt_dbp);
-	return (RET_ERROR);
-}
-
-/*
- * BT_PAGE -- Split a non-root page of a btree.
- *
- * Parameters:
- *	t:	tree
- *	h:	root page
- *	lp:	pointer to left page pointer
- *	rp:	pointer to right page pointer
- *	skip:	pointer to index to leave open
- *	ilen:	insert length
- *
- * Returns:
- *	Pointer to page in which to insert or NULL on error.
- */
-static PAGE *
-bt_page(t, h, lp, rp, skip, ilen)
-	BTREE *t;
-	PAGE *h, **lp, **rp;
-	indx_t *skip;
-	size_t ilen;
-{
-	PAGE *l, *r, *tp;
-	pgno_t npg;
-
-#ifdef STATISTICS
-	++bt_split;
-#endif
-	/* Put the new right page for the split into place. */
-	if ((r = __bt_new(t, &npg)) == NULL)
-		return (NULL);
-	r->pgno = npg;
-	r->lower = BTDATAOFF;
-	r->upper = t->bt_psize;
-	r->nextpg = h->nextpg;
-	r->prevpg = h->pgno;
-	r->flags = h->flags & P_TYPE;
-
-	/*
-	 * If we're splitting the last page on a level because we're appending
-	 * a key to it (skip is NEXTINDEX()), it's likely that the data is
-	 * sorted.  Adding an empty page on the side of the level is less work
-	 * and can push the fill factor much higher than normal.  If we're
-	 * wrong it's no big deal, we'll just do the split the right way next
-	 * time.  It may look like it's equally easy to do a similar hack for
-	 * reverse sorted data, that is, split the tree left, but it's not.
-	 * Don't even try.
-	 */
-	if (h->nextpg == P_INVALID && *skip == NEXTINDEX(h)) {
-#ifdef STATISTICS
-		++bt_sortsplit;
-#endif
-		h->nextpg = r->pgno;
-		r->lower = BTDATAOFF + sizeof(indx_t);
-		*skip = 0;
-		*lp = h;
-		*rp = r;
-		return (r);
-	}
-
-	/* Put the new left page for the split into place. */
-	if ((l = (PAGE *)malloc(t->bt_psize)) == NULL) {
-		mpool_put(t->bt_mp, r, 0);
-		return (NULL);
-	}
-#ifdef PURIFY
-	memset(l, 0xff, t->bt_psize);
-#endif
-	l->pgno = h->pgno;
-	l->nextpg = r->pgno;
-	l->prevpg = h->prevpg;
-	l->lower = BTDATAOFF;
-	l->upper = t->bt_psize;
-	l->flags = h->flags & P_TYPE;
-
-	/* Fix up the previous pointer of the page after the split page. */
-	if (h->nextpg != P_INVALID) {
-		if ((tp = mpool_get(t->bt_mp, h->nextpg, 0)) == NULL) {
-			free(l);
-			/* XXX mpool_free(t->bt_mp, r->pgno); */
-			return (NULL);
-		}
-		tp->prevpg = r->pgno;
-		mpool_put(t->bt_mp, tp, MPOOL_DIRTY);
-	}
-
-	/*
-	 * Split right.  The key/data pairs aren't sorted in the btree page so
-	 * it's simpler to copy the data from the split page onto two new pages
-	 * instead of copying half the data to the right page and compacting
-	 * the left page in place.  Since the left page can't change, we have
-	 * to swap the original and the allocated left page after the split.
-	 */
-	tp = bt_psplit(t, h, l, r, skip, ilen);
-
-	/* Move the new left page onto the old left page. */
-	memmove(h, l, t->bt_psize);
-	if (tp == l)
-		tp = h;
-	free(l);
-
-	*lp = h;
-	*rp = r;
-	return (tp);
-}
-
-/*
- * BT_ROOT -- Split the root page of a btree.
- *
- * Parameters:
- *	t:	tree
- *	h:	root page
- *	lp:	pointer to left page pointer
- *	rp:	pointer to right page pointer
- *	skip:	pointer to index to leave open
- *	ilen:	insert length
- *
- * Returns:
- *	Pointer to page in which to insert or NULL on error.
- */
-static PAGE *
-bt_root(t, h, lp, rp, skip, ilen)
-	BTREE *t;
-	PAGE *h, **lp, **rp;
-	indx_t *skip;
-	size_t ilen;
-{
-	PAGE *l, *r, *tp;
-	pgno_t lnpg, rnpg;
-
-#ifdef STATISTICS
-	++bt_split;
-	++bt_rootsplit;
-#endif
-	/* Put the new left and right pages for the split into place. */
-	if ((l = __bt_new(t, &lnpg)) == NULL ||
-	    (r = __bt_new(t, &rnpg)) == NULL)
-		return (NULL);
-	l->pgno = lnpg;
-	r->pgno = rnpg;
-	l->nextpg = r->pgno;
-	r->prevpg = l->pgno;
-	l->prevpg = r->nextpg = P_INVALID;
-	l->lower = r->lower = BTDATAOFF;
-	l->upper = r->upper = t->bt_psize;
-	l->flags = r->flags = h->flags & P_TYPE;
-
-	/* Split the root page. */
-	tp = bt_psplit(t, h, l, r, skip, ilen);
-
-	*lp = l;
-	*rp = r;
-	return (tp);
-}
-
-/*
- * BT_RROOT -- Fix up the recno root page after it has been split.
- *
- * Parameters:
- *	t:	tree
- *	h:	root page
- *	l:	left page
- *	r:	right page
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS
- */
-static int
-bt_rroot(t, h, l, r)
-	BTREE *t;
-	PAGE *h, *l, *r;
-{
-	char *dest;
-
-	/* Insert the left and right keys, set the header information. */
-	h->linp[0] = h->upper = t->bt_psize - NRINTERNAL;
-	dest = (char *)h + h->upper;
-	WR_RINTERNAL(dest,
-	    l->flags & P_RLEAF ? NEXTINDEX(l) : rec_total(l), l->pgno);
-
-	h->linp[1] = h->upper -= NRINTERNAL;
-	dest = (char *)h + h->upper;
-	WR_RINTERNAL(dest,
-	    r->flags & P_RLEAF ? NEXTINDEX(r) : rec_total(r), r->pgno);
-
-	h->lower = BTDATAOFF + 2 * sizeof(indx_t);
-
-	/* Unpin the root page, set to recno internal page. */
-	h->flags &= ~P_TYPE;
-	h->flags |= P_RINTERNAL;
-	mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-
-	return (RET_SUCCESS);
-}
-
-/*
- * BT_BROOT -- Fix up the btree root page after it has been split.
- *
- * Parameters:
- *	t:	tree
- *	h:	root page
- *	l:	left page
- *	r:	right page
- *
- * Returns:
- *	RET_ERROR, RET_SUCCESS
- */
-static int
-bt_broot(t, h, l, r)
-	BTREE *t;
-	PAGE *h, *l, *r;
-{
-	BINTERNAL *bi;
-	BLEAF *bl;
-	u_int32_t nbytes;
-	char *dest;
-
-	/*
-	 * If the root page was a leaf page, change it into an internal page.
-	 * We copy the key we split on (but not the key's data, in the case of
-	 * a leaf page) to the new root page.
-	 *
-	 * The btree comparison code guarantees that the left-most key on any
-	 * level of the tree is never used, so it doesn't need to be filled in.
-	 */
-	nbytes = NBINTERNAL(0);
-	h->linp[0] = h->upper = t->bt_psize - nbytes;
-	dest = (char *)h + h->upper;
-	WR_BINTERNAL(dest, 0, l->pgno, 0);
-
-	switch (h->flags & P_TYPE) {
-	case P_BLEAF:
-		bl = GETBLEAF(r, 0);
-		nbytes = NBINTERNAL(bl->ksize);
-		h->linp[1] = h->upper -= nbytes;
-		dest = (char *)h + h->upper;
-		WR_BINTERNAL(dest, bl->ksize, r->pgno, 0);
-		memmove(dest, bl->bytes, bl->ksize);
-
-		/*
-		 * If the key is on an overflow page, mark the overflow chain
-		 * so it isn't deleted when the leaf copy of the key is deleted.
-		 */
-		if (bl->flags & P_BIGKEY &&
-		    bt_preserve(t, *(pgno_t *)bl->bytes) == RET_ERROR)
-			return (RET_ERROR);
-		break;
-	case P_BINTERNAL:
-		bi = GETBINTERNAL(r, 0);
-		nbytes = NBINTERNAL(bi->ksize);
-		h->linp[1] = h->upper -= nbytes;
-		dest = (char *)h + h->upper;
-		memmove(dest, bi, nbytes);
-		((BINTERNAL *)dest)->pgno = r->pgno;
-		break;
-	default:
-		abort();
-	}
-
-	/* There are two keys on the page. */
-	h->lower = BTDATAOFF + 2 * sizeof(indx_t);
-
-	/* Unpin the root page, set to btree internal page. */
-	h->flags &= ~P_TYPE;
-	h->flags |= P_BINTERNAL;
-	mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-
-	return (RET_SUCCESS);
-}
-
-/*
- * BT_PSPLIT -- Do the real work of splitting the page.
- *
- * Parameters:
- *	t:	tree
- *	h:	page to be split
- *	l:	page to put lower half of data
- *	r:	page to put upper half of data
- *	pskip:	pointer to index to leave open
- *	ilen:	insert length
- *
- * Returns:
- *	Pointer to page in which to insert.
- */
-static PAGE *
-bt_psplit(t, h, l, r, pskip, ilen)
-	BTREE *t;
-	PAGE *h, *l, *r;
-	indx_t *pskip;
-	size_t ilen;
-{
-	BINTERNAL *bi;
-	BLEAF *bl;
-	CURSOR *c;
-	RLEAF *rl;
-	PAGE *rval;
-	void *src;
-	indx_t full, half, nxt, off, skip, top, used;
-	u_int32_t nbytes;
-	int bigkeycnt, isbigkey;
-
-	/*
-	 * Split the data to the left and right pages.  Leave the skip index
-	 * open.  Additionally, make some effort not to split on an overflow
-	 * key.  This makes internal page processing faster and can save
-	 * space as overflow keys used by internal pages are never deleted.
-	 */
-	bigkeycnt = 0;
-	skip = *pskip;
-	full = t->bt_psize - BTDATAOFF;
-	half = full / 2;
-	used = 0;
-	for (nxt = off = 0, top = NEXTINDEX(h); nxt < top; ++off) {
-		if (skip == off) {
-			nbytes = ilen;
-			isbigkey = 0;		/* XXX: not really known. */
-		} else
-			switch (h->flags & P_TYPE) {
-			case P_BINTERNAL:
-				src = bi = GETBINTERNAL(h, nxt);
-				nbytes = NBINTERNAL(bi->ksize);
-				isbigkey = bi->flags & P_BIGKEY;
-				break;
-			case P_BLEAF:
-				src = bl = GETBLEAF(h, nxt);
-				nbytes = NBLEAF(bl);
-				isbigkey = bl->flags & P_BIGKEY;
-				break;
-			case P_RINTERNAL:
-				src = GETRINTERNAL(h, nxt);
-				nbytes = NRINTERNAL;
-				isbigkey = 0;
-				break;
-			case P_RLEAF:
-				src = rl = GETRLEAF(h, nxt);
-				nbytes = NRLEAF(rl);
-				isbigkey = 0;
-				break;
-			default:
-				abort();
-			}
-
-		/*
-		 * If the key/data pairs are substantial fractions of the max
-		 * possible size for the page, it's possible to get situations
-		 * where we decide to try and copy too much onto the left page.
-		 * Make sure that doesn't happen.
-		 */
-		if ((skip <= off && used + nbytes + sizeof(indx_t) >= full)
-		    || nxt == top - 1) {
-			--off;
-			break;
-		}
-
-		/* Copy the key/data pair, if not the skipped index. */
-		if (skip != off) {
-			++nxt;
-
-			l->linp[off] = l->upper -= nbytes;
-			memmove((char *)l + l->upper, src, nbytes);
-		}
-
-		used += nbytes + sizeof(indx_t);
-		if (used >= half) {
-			if (!isbigkey || bigkeycnt == 3)
-				break;
-			else
-				++bigkeycnt;
-		}
-	}
-
-	/*
-	 * Off is the last offset that's valid for the left page.
-	 * Nxt is the first offset to be placed on the right page.
-	 */
-	l->lower += (off + 1) * sizeof(indx_t);
-
-	/*
-	 * If splitting the page that the cursor was on, the cursor has to be
-	 * adjusted to point to the same record as before the split.  If the
-	 * cursor is at or past the skipped slot, the cursor is incremented by
-	 * one.  If the cursor is on the right page, it is decremented by the
-	 * number of records split to the left page.
-	 */
-	c = &t->bt_cursor;
-	if (F_ISSET(c, CURS_INIT) && c->pg.pgno == h->pgno) {
-		if (c->pg.index >= skip)
-			++c->pg.index;
-		if (c->pg.index < nxt)			/* Left page. */
-			c->pg.pgno = l->pgno;
-		else {					/* Right page. */
-			c->pg.pgno = r->pgno;
-			c->pg.index -= nxt;
-		}
-	}
-
-	/*
-	 * If the skipped index was on the left page, just return that page.
-	 * Otherwise, adjust the skip index to reflect the new position on
-	 * the right page.
-	 */
-	if (skip <= off) {
-		skip = 0;
-		rval = l;
-	} else {
-		rval = r;
-		*pskip -= nxt;
-	}
-
-	for (off = 0; nxt < top; ++off) {
-		if (skip == nxt) {
-			++off;
-			skip = 0;
-		}
-		switch (h->flags & P_TYPE) {
-		case P_BINTERNAL:
-			src = bi = GETBINTERNAL(h, nxt);
-			nbytes = NBINTERNAL(bi->ksize);
-			break;
-		case P_BLEAF:
-			src = bl = GETBLEAF(h, nxt);
-			nbytes = NBLEAF(bl);
-			break;
-		case P_RINTERNAL:
-			src = GETRINTERNAL(h, nxt);
-			nbytes = NRINTERNAL;
-			break;
-		case P_RLEAF:
-			src = rl = GETRLEAF(h, nxt);
-			nbytes = NRLEAF(rl);
-			break;
-		default:
-			abort();
-		}
-		++nxt;
-		r->linp[off] = r->upper -= nbytes;
-		memmove((char *)r + r->upper, src, nbytes);
-	}
-	r->lower += off * sizeof(indx_t);
-
-	/* If the key is being appended to the page, adjust the index. */
-	if (skip == top)
-		r->lower += sizeof(indx_t);
-
-	return (rval);
-}
-
-/*
- * BT_PRESERVE -- Mark a chain of pages as used by an internal node.
- *
- * Chains of indirect blocks pointed to by leaf nodes get reclaimed when the
- * record that references them gets deleted.  Chains pointed to by internal
- * pages never get deleted.  This routine marks a chain as pointed to by an
- * internal page.
- *
- * Parameters:
- *	t:	tree
- *	pg:	page number of first page in the chain.
- *
- * Returns:
- *	RET_SUCCESS, RET_ERROR.
- */
-static int
-bt_preserve(t, pg)
-	BTREE *t;
-	pgno_t pg;
-{
-	PAGE *h;
-
-	if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
-		return (RET_ERROR);
-	h->flags |= P_PRESERVE;
-	mpool_put(t->bt_mp, h, MPOOL_DIRTY);
-	return (RET_SUCCESS);
-}
-
-/*
- * REC_TOTAL -- Return the number of recno entries below a page.
- *
- * Parameters:
- *	h:	page
- *
- * Returns:
- *	The number of recno entries below a page.
- *
- * XXX
- * These values could be set by the bt_psplit routine.  The problem is that the
- * entry has to be popped off of the stack etc. or the values have to be passed
- * all the way back to bt_split/bt_rroot and it's not very clean.
- */
-static recno_t
-rec_total(h)
-	PAGE *h;
-{
-	recno_t recs;
-	indx_t nxt, top;
-
-	for (recs = 0, nxt = 0, top = NEXTINDEX(h); nxt < top; ++nxt)
-		recs += GETRINTERNAL(h, nxt)->nrecs;
-	return (recs);
-}
diff --git a/db/btree/bt_utils.c b/db/btree/bt_utils.c
deleted file mode 100644
index 1416c78..0000000
--- a/db/btree/bt_utils.c
+++ /dev/null
@@ -1,260 +0,0 @@
-/*-
- * 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. 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[] = "@(#)bt_utils.c	8.8 (Berkeley) 7/20/94";
-#endif /* LIBC_SCCS and not lint */
-
-#include <sys/param.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <db.h>
-#include "btree.h"
-
-/*
- * __bt_ret --
- *	Build return key/data pair.
- *
- * Parameters:
- *	t:	tree
- *	e:	key/data pair to be returned
- *	key:	user's key structure (NULL if not to be filled in)
- *	rkey:	memory area to hold key
- *	data:	user's data structure (NULL if not to be filled in)
- *	rdata:	memory area to hold data
- *       copy:	always copy the key/data item
- *
- * Returns:
- *	RET_SUCCESS, RET_ERROR.
- */
-int
-__bt_ret(t, e, key, rkey, data, rdata, copy)
-	BTREE *t;
-	EPG *e;
-	DBT *key, *rkey, *data, *rdata;
-	int copy;
-{
-	BLEAF *bl;
-	void *p;
-
-	bl = GETBLEAF(e->page, e->index);
-
-	/*
-	 * We must copy big keys/data to make them contiguous.  Otherwise,
-	 * leave the page pinned and don't copy unless the user specified
-	 * concurrent access.
-	 */
-	if (key == NULL)
-		goto dataonly;
-
-	if (bl->flags & P_BIGKEY) {
-		if (__ovfl_get(t, bl->bytes,
-		    &key->size, &rkey->data, &rkey->size))
-			return (RET_ERROR);
-		key->data = rkey->data;
-	} else if (copy || F_ISSET(t, B_DB_LOCK)) {
-		if (bl->ksize > rkey->size) {
-			p = (void *)(rkey->data == NULL ?
-			    malloc(bl->ksize) : realloc(rkey->data, bl->ksize));
-			if (p == NULL)
-				return (RET_ERROR);
-			rkey->data = p;
-			rkey->size = bl->ksize;
-		}
-		memmove(rkey->data, bl->bytes, bl->ksize);
-		key->size = bl->ksize;
-		key->data = rkey->data;
-	} else {
-		key->size = bl->ksize;
-		key->data = bl->bytes;
-	}
-
-dataonly:
-	if (data == NULL)
-		return (RET_SUCCESS);
-
-	if (bl->flags & P_BIGDATA) {
-		if (__ovfl_get(t, bl->bytes + bl->ksize,
-		    &data->size, &rdata->data, &rdata->size))
-			return (RET_ERROR);
-		data->data = rdata->data;
-	} else if (copy || F_ISSET(t, B_DB_LOCK)) {
-		/* Use +1 in case the first record retrieved is 0 length. */
-		if (bl->dsize + 1 > rdata->size) {
-			p = (void *)(rdata->data == NULL ?
-			    malloc(bl->dsize + 1) :
-			    realloc(rdata->data, bl->dsize + 1));
-			if (p == NULL)
-				return (RET_ERROR);
-			rdata->data = p;
-			rdata->size = bl->dsize + 1;
-		}
-		memmove(rdata->data, bl->bytes + bl->ksize, bl->dsize);
-		data->size = bl->dsize;
-		data->data = rdata->data;
-	} else {
-		data->size = bl->dsize;
-		data->data = bl->bytes + bl->ksize;
-	}
-
-	return (RET_SUCCESS);
-}
-
-/*
- * __BT_CMP -- Compare a key to a given record.
- *
- * Parameters:
- *	t:	tree
- *	k1:	DBT pointer of first arg to comparison
- *	e:	pointer to EPG for comparison
- *
- * Returns:
- *	< 0 if k1 is < record
- *	= 0 if k1 is = record
- *	> 0 if k1 is > record
- */
-int
-__bt_cmp(t, k1, e)
-	BTREE *t;
-	const DBT *k1;
-	EPG *e;
-{
-	BINTERNAL *bi;
-	BLEAF *bl;
-	DBT k2;
-	PAGE *h;
-	void *bigkey;
-
-	/*
-	 * The left-most key on internal pages, at any level of the tree, is
-	 * guaranteed by the following code to be less than any user key.
-	 * This saves us from having to update the leftmost key on an internal
-	 * page when the user inserts a new key in the tree smaller than
-	 * anything we've yet seen.
-	 */
-	h = e->page;
-	if (e->index == 0 && h->prevpg == P_INVALID && !(h->flags & P_BLEAF))
-		return (1);
-
-	bigkey = NULL;
-	if (h->flags & P_BLEAF) {
-		bl = GETBLEAF(h, e->index);
-		if (bl->flags & P_BIGKEY)
-			bigkey = bl->bytes;
-		else {
-			k2.data = bl->bytes;
-			k2.size = bl->ksize;
-		}
-	} else {
-		bi = GETBINTERNAL(h, e->index);
-		if (bi->flags & P_BIGKEY)
-			bigkey = bi->bytes;
-		else {
-			k2.data = bi->bytes;
-			k2.size = bi->ksize;
-		}
-	}
-
-	if (bigkey) {
-		if (__ovfl_get(t, bigkey,
-		    &k2.size, &t->bt_rdata.data, &t->bt_rdata.size))
-			return (RET_ERROR);
-		k2.data = t->bt_rdata.data;
-	}
-	return ((*t->bt_cmp)(k1, &k2));
-}
-
-/*
- * __BT_DEFCMP -- Default comparison routine.
- *
- * Parameters:
- *	a:	DBT #1
- *	b: 	DBT #2
- *
- * Returns:
- *	< 0 if a is < b
- *	= 0 if a is = b
- *	> 0 if a is > b
- */
-int
-__bt_defcmp(a, b)
-	const DBT *a, *b;
-{
-	register size_t len;
-	register u_char *p1, *p2;
-
-	/*
-	 * XXX
-	 * If a size_t doesn't fit in an int, this routine can lose.
-	 * What we need is a integral type which is guaranteed to be
-	 * larger than a size_t, and there is no such thing.
-	 */
-	len = MIN(a->size, b->size);
-	for (p1 = a->data, p2 = b->data; len--; ++p1, ++p2)
-		if (*p1 != *p2)
-			return ((int)*p1 - (int)*p2);
-	return ((int)a->size - (int)b->size);
-}
-
-/*
- * __BT_DEFPFX -- Default prefix routine.
- *
- * Parameters:
- *	a:	DBT #1
- *	b: 	DBT #2
- *
- * Returns:
- *	Number of bytes needed to distinguish b from a.
- */
-size_t
-__bt_defpfx(a, b)
-	const DBT *a, *b;
-{
-	register u_char *p1, *p2;
-	register size_t cnt, len;
-
-	cnt = 1;
-	len = MIN(a->size, b->size);
-	for (p1 = a->data, p2 = b->data; len--; ++p1, ++p2, ++cnt)
-		if (*p1 != *p2)
-			return (cnt);
-
-	/* a->size must be <= b->size, or they wouldn't be in this order. */
-	return (a->size < b->size ? a->size + 1 : a->size);
-}
diff --git a/db/btree/btree.h b/db/btree/btree.h
deleted file mode 100644
index 45f7c94..0000000
--- a/db/btree/btree.h
+++ /dev/null
@@ -1,395 +0,0 @@
-/*-
- * Copyright (c) 1991, 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. 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.
- *
- *	@(#)btree.h	8.11 (Berkeley) 8/17/94
- */
-
-/* Macros to set/clear/test flags. */
-#define	F_SET(p, f)	(p)->flags |= (f)
-#define	F_CLR(p, f)	(p)->flags &= ~(f)
-#define	F_ISSET(p, f)	((p)->flags & (f))
-
-#include <mpool.h>
-
-#ifdef _LIBC
-/* In the GNU C library we must not pollute the namespace because libdb is
-   needed by libnss_db.  */
-#define mpool_open __mpool_open
-#define mpool_filter __mpool_filter
-#define mpool_new __mpool_new
-#define mpool_get __mpool_get
-#define mpool_put __mpool_put
-#define mpool_sync __mpool_sync
-#define mpool_close __mpool_close
-#endif
-
-#define	DEFMINKEYPAGE	(2)		/* Minimum keys per page */
-#define	MINCACHE	(5)		/* Minimum cached pages */
-#define	MINPSIZE	(512)		/* Minimum page size */
-
-/*
- * Page 0 of a btree file contains a copy of the meta-data.  This page is also
- * used as an out-of-band page, i.e. page pointers that point to nowhere point
- * to page 0.  Page 1 is the root of the btree.
- */
-#define	P_INVALID	 0		/* Invalid tree page number. */
-#define	P_META		 0		/* Tree metadata page number. */
-#define	P_ROOT		 1		/* Tree root page number. */
-
-/*
- * There are five page layouts in the btree: btree internal pages (BINTERNAL),
- * btree leaf pages (BLEAF), recno internal pages (RINTERNAL), recno leaf pages
- * (RLEAF) and overflow pages.  All five page types have a page header (PAGE).
- * This implementation requires that values within structures NOT be padded.
- * (ANSI C permits random padding.)  If your compiler pads randomly you'll have
- * to do some work to get this package to run.
- */
-typedef struct _page {
-	pgno_t	pgno;			/* this page's page number */
-	pgno_t	prevpg;			/* left sibling */
-	pgno_t	nextpg;			/* right sibling */
-
-#define	P_BINTERNAL	0x01		/* btree internal page */
-#define	P_BLEAF		0x02		/* leaf page */
-#define	P_OVERFLOW	0x04		/* overflow page */
-#define	P_RINTERNAL	0x08		/* recno internal page */
-#define	P_RLEAF		0x10		/* leaf page */
-#define P_TYPE		0x1f		/* type mask */
-#define	P_PRESERVE	0x20		/* never delete this chain of pages */
-	u_int32_t flags;
-
-	indx_t	lower;			/* lower bound of free space on page */
-	indx_t	upper;			/* upper bound of free space on page */
-	indx_t	linp[1];		/* indx_t-aligned VAR. LENGTH DATA */
-} PAGE;
-
-/* First and next index. */
-#define	BTDATAOFF							\
-	(sizeof(pgno_t) + sizeof(pgno_t) + sizeof(pgno_t) +		\
-	    sizeof(u_int32_t) + sizeof(indx_t) + sizeof(indx_t))
-#define	NEXTINDEX(p)	(((p)->lower - BTDATAOFF) / sizeof(indx_t))
-
-/*
- * For pages other than overflow pages, there is an array of offsets into the
- * rest of the page immediately following the page header.  Each offset is to
- * an item which is unique to the type of page.  The h_lower offset is just
- * past the last filled-in index.  The h_upper offset is the first item on the
- * page.  Offsets are from the beginning of the page.
- *
- * If an item is too big to store on a single page, a flag is set and the item
- * is a { page, size } pair such that the page is the first page of an overflow
- * chain with size bytes of item.  Overflow pages are simply bytes without any
- * external structure.
- *
- * The page number and size fields in the items are pgno_t-aligned so they can
- * be manipulated without copying.  (This presumes that 32 bit items can be
- * manipulated on this system.)
- */
-#define	LALIGN(n)	(((n) + sizeof(pgno_t) - 1) & ~(sizeof(pgno_t) - 1))
-#define	NOVFLSIZE	(sizeof(pgno_t) + sizeof(u_int32_t))
-
-/*
- * For the btree internal pages, the item is a key.  BINTERNALs are {key, pgno}
- * pairs, such that the key compares less than or equal to all of the records
- * on that page.  For a tree without duplicate keys, an internal page with two
- * consecutive keys, a and b, will have all records greater than or equal to a
- * and less than b stored on the page associated with a.  Duplicate keys are
- * somewhat special and can cause duplicate internal and leaf page records and
- * some minor modifications of the above rule.
- */
-typedef struct _binternal {
-	u_int32_t ksize;		/* key size */
-	pgno_t	pgno;			/* page number stored on */
-#define	P_BIGDATA	0x01		/* overflow data */
-#define	P_BIGKEY	0x02		/* overflow key */
-	u_char	flags;
-	char	bytes[1];		/* data */
-} BINTERNAL;
-
-/* Get the page's BINTERNAL structure at index indx. */
-#define	GETBINTERNAL(pg, indx)						\
-	((BINTERNAL *)((char *)(pg) + (pg)->linp[indx]))
-
-/* Get the number of bytes in the entry. */
-#define NBINTERNAL(len)							\
-	LALIGN(sizeof(u_int32_t) + sizeof(pgno_t) + sizeof(u_char) + (len))
-
-/* Copy a BINTERNAL entry to the page. */
-#define	WR_BINTERNAL(p, size, pgno, flags) {				\
-	*(u_int32_t *)p = size;						\
-	p += sizeof(u_int32_t);						\
-	*(pgno_t *)p = pgno;						\
-	p += sizeof(pgno_t);						\
-	*(u_char *)p = flags;						\
-	p += sizeof(u_char);						\
-}
-
-/*
- * For the recno internal pages, the item is a page number with the number of
- * keys found on that page and below.
- */
-typedef struct _rinternal {
-	recno_t	nrecs;			/* number of records */
-	pgno_t	pgno;			/* page number stored below */
-} RINTERNAL;
-
-/* Get the page's RINTERNAL structure at index indx. */
-#define	GETRINTERNAL(pg, indx)						\
-	((RINTERNAL *)((char *)(pg) + (pg)->linp[indx]))
-
-/* Get the number of bytes in the entry. */
-#define NRINTERNAL							\
-	LALIGN(sizeof(recno_t) + sizeof(pgno_t))
-
-/* Copy a RINTERNAL entry to the page. */
-#define	WR_RINTERNAL(p, nrecs, pgno) {					\
-	*(recno_t *)p = nrecs;						\
-	p += sizeof(recno_t);						\
-	*(pgno_t *)p = pgno;						\
-}
-
-/* For the btree leaf pages, the item is a key and data pair. */
-typedef struct _bleaf {
-	u_int32_t	ksize;		/* size of key */
-	u_int32_t	dsize;		/* size of data */
-	u_char	flags;			/* P_BIGDATA, P_BIGKEY */
-	char	bytes[1];		/* data */
-} BLEAF;
-
-/* Get the page's BLEAF structure at index indx. */
-#define	GETBLEAF(pg, indx)						\
-	((BLEAF *)((char *)(pg) + (pg)->linp[indx]))
-
-/* Get the number of bytes in the entry. */
-#define NBLEAF(p)	NBLEAFDBT((p)->ksize, (p)->dsize)
-
-/* Get the number of bytes in the user's key/data pair. */
-#define NBLEAFDBT(ksize, dsize)						\
-	LALIGN(sizeof(u_int32_t) + sizeof(u_int32_t) + sizeof(u_char) +	\
-	    (ksize) + (dsize))
-
-/* Copy a BLEAF entry to the page. */
-#define	WR_BLEAF(p, key, data, flags) {					\
-	*(u_int32_t *)p = key->size;					\
-	p += sizeof(u_int32_t);						\
-	*(u_int32_t *)p = data->size;					\
-	p += sizeof(u_int32_t);						\
-	*(u_char *)p = flags;						\
-	p += sizeof(u_char);						\
-	memmove(p, key->data, key->size);				\
-	p += key->size;							\
-	memmove(p, data->data, data->size);				\
-}
-
-/* For the recno leaf pages, the item is a data entry. */
-typedef struct _rleaf {
-	u_int32_t	dsize;		/* size of data */
-	u_char	flags;			/* P_BIGDATA */
-	char	bytes[1];
-} RLEAF;
-
-/* Get the page's RLEAF structure at index indx. */
-#define	GETRLEAF(pg, indx)						\
-	((RLEAF *)((char *)(pg) + (pg)->linp[indx]))
-
-/* Get the number of bytes in the entry. */
-#define NRLEAF(p)	NRLEAFDBT((p)->dsize)
-
-/* Get the number of bytes from the user's data. */
-#define	NRLEAFDBT(dsize)						\
-	LALIGN(sizeof(u_int32_t) + sizeof(u_char) + (dsize))
-
-/* Copy a RLEAF entry to the page. */
-#define	WR_RLEAF(p, data, flags) {					\
-	*(u_int32_t *)p = data->size;					\
-	p += sizeof(u_int32_t);						\
-	*(u_char *)p = flags;						\
-	p += sizeof(u_char);						\
-	memmove(p, data->data, data->size);				\
-}
-
-/*
- * A record in the tree is either a pointer to a page and an index in the page
- * or a page number and an index.  These structures are used as a cursor, stack
- * entry and search returns as well as to pass records to other routines.
- *
- * One comment about searches.  Internal page searches must find the largest
- * record less than key in the tree so that descents work.  Leaf page searches
- * must find the smallest record greater than key so that the returned index
- * is the record's correct position for insertion.
- */
-typedef struct _epgno {
-	pgno_t	pgno;			/* the page number */
-	indx_t	index;			/* the index on the page */
-} EPGNO;
-
-typedef struct _epg {
-	PAGE	*page;			/* the (pinned) page */
-	indx_t	 index;			/* the index on the page */
-} EPG;
-
-/*
- * About cursors.  The cursor (and the page that contained the key/data pair
- * that it referenced) can be deleted, which makes things a bit tricky.  If
- * there are no duplicates of the cursor key in the tree (i.e. B_NODUPS is set
- * or there simply aren't any duplicates of the key) we copy the key that it
- * referenced when it's deleted, and reacquire a new cursor key if the cursor
- * is used again.  If there are duplicates keys, we move to the next/previous
- * key, and set a flag so that we know what happened.  NOTE: if duplicate (to
- * the cursor) keys are added to the tree during this process, it is undefined
- * if they will be returned or not in a cursor scan.
- *
- * The flags determine the possible states of the cursor:
- *
- * CURS_INIT	The cursor references *something*.
- * CURS_ACQUIRE	The cursor was deleted, and a key has been saved so that
- *		we can reacquire the right position in the tree.
- * CURS_AFTER, CURS_BEFORE
- *		The cursor was deleted, and now references a key/data pair
- *		that has not yet been returned, either before or after the
- *		deleted key/data pair.
- * XXX
- * This structure is broken out so that we can eventually offer multiple
- * cursors as part of the DB interface.
- */
-typedef struct _cursor {
-	EPGNO	 pg;			/* B: Saved tree reference. */
-	DBT	 key;			/* B: Saved key, or key.data == NULL. */
-	recno_t	 rcursor;		/* R: recno cursor (1-based) */
-
-#define	CURS_ACQUIRE	0x01		/*  B: Cursor needs to be reacquired. */
-#define	CURS_AFTER	0x02		/*  B: Unreturned cursor after key. */
-#define	CURS_BEFORE	0x04		/*  B: Unreturned cursor before key. */
-#define	CURS_INIT	0x08		/* RB: Cursor initialized. */
-	u_int8_t flags;
-} CURSOR;
-
-/*
- * The metadata of the tree.  The nrecs field is used only by the RECNO code.
- * This is because the btree doesn't really need it and it requires that every
- * put or delete call modify the metadata.
- */
-typedef struct _btmeta {
-	u_int32_t	magic;		/* magic number */
-	u_int32_t	version;	/* version */
-	u_int32_t	psize;		/* page size */
-	u_int32_t	free;		/* page number of first free page */
-	u_int32_t	nrecs;		/* R: number of records */
-
-#define	SAVEMETA	(B_NODUPS | R_RECNO)
-	u_int32_t	flags;		/* bt_flags & SAVEMETA */
-} BTMETA;
-
-/* The in-memory btree/recno data structure. */
-typedef struct _btree {
-	MPOOL	 *bt_mp;		/* memory pool cookie */
-
-	DB	 *bt_dbp;		/* pointer to enclosing DB */
-
-	EPG	  bt_cur;		/* current (pinned) page */
-	PAGE	 *bt_pinned;		/* page pinned across calls */
-
-	CURSOR	  bt_cursor;		/* cursor */
-
-#define	BT_PUSH(t, p, i) {						\
-	t->bt_sp->pgno = p; 						\
-	t->bt_sp->index = i; 						\
-	++t->bt_sp;							\
-}
-#define	BT_POP(t)	(t->bt_sp == t->bt_stack ? NULL : --t->bt_sp)
-#define	BT_CLR(t)	(t->bt_sp = t->bt_stack)
-	EPGNO	  bt_stack[50];		/* stack of parent pages */
-	EPGNO	 *bt_sp;		/* current stack pointer */
-
-	DBT	  bt_rkey;		/* returned key */
-	DBT	  bt_rdata;		/* returned data */
-
-	int	  bt_fd;		/* tree file descriptor */
-
-	pgno_t	  bt_free;		/* next free page */
-	u_int32_t bt_psize;		/* page size */
-	indx_t	  bt_ovflsize;		/* cut-off for key/data overflow */
-	int	  bt_lorder;		/* byte order */
-					/* sorted order */
-	enum { NOT, BACK, FORWARD } bt_order;
-	EPGNO	  bt_last;		/* last insert */
-
-					/* B: key comparison function */
-	int	(*bt_cmp) __P((const DBT *, const DBT *));
-					/* B: prefix comparison function */
-	size_t	(*bt_pfx) __P((const DBT *, const DBT *));
-					/* R: recno input function */
-	int	(*bt_irec) __P((struct _btree *, recno_t));
-
-	FILE	 *bt_rfp;		/* R: record FILE pointer */
-	int	  bt_rfd;		/* R: record file descriptor */
-
-	caddr_t	  bt_cmap;		/* R: current point in mapped space */
-	caddr_t	  bt_smap;		/* R: start of mapped space */
-	caddr_t   bt_emap;		/* R: end of mapped space */
-	size_t	  bt_msize;		/* R: size of mapped region. */
-
-	recno_t	  bt_nrecs;		/* R: number of records */
-	size_t	  bt_reclen;		/* R: fixed record length */
-	u_char	  bt_bval;		/* R: delimiting byte/pad character */
-
-/*
- * NB:
- * B_NODUPS and R_RECNO are stored on disk, and may not be changed.
- */
-#define	B_INMEM		0x00001		/* in-memory tree */
-#define	B_METADIRTY	0x00002		/* need to write metadata */
-#define	B_MODIFIED	0x00004		/* tree modified */
-#define	B_NEEDSWAP	0x00008		/* if byte order requires swapping */
-#define	B_RDONLY	0x00010		/* read-only tree */
-
-#define	B_NODUPS	0x00020		/* no duplicate keys permitted */
-#define	R_RECNO		0x00080		/* record oriented tree */
-
-#define	R_CLOSEFP	0x00040		/* opened a file pointer */
-#define	R_EOF		0x00100		/* end of input file reached. */
-#define	R_FIXLEN	0x00200		/* fixed length records */
-#define	R_MEMMAPPED	0x00400		/* memory mapped file. */
-#define	R_INMEM		0x00800		/* in-memory file */
-#define	R_MODIFIED	0x01000		/* modified file */
-#define	R_RDONLY	0x02000		/* read-only file */
-
-#define	B_DB_LOCK	0x04000		/* DB_LOCK specified. */
-#define	B_DB_SHMEM	0x08000		/* DB_SHMEM specified. */
-#define	B_DB_TXN	0x10000		/* DB_TXN specified. */
-	u_int32_t flags;
-} BTREE;
-
-#include "extern.h"
diff --git a/db/btree/extern.h b/db/btree/extern.h
deleted file mode 100644
index ebd9c54..0000000
--- a/db/btree/extern.h
+++ /dev/null
@@ -1,70 +0,0 @@
-/*-
- * Copyright (c) 1991, 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.
- *
- *	@(#)extern.h	8.10 (Berkeley) 7/20/94
- */
-
-int	 __bt_close __P((DB *));
-int	 __bt_cmp __P((BTREE *, const DBT *, EPG *));
-int	 __bt_crsrdel __P((BTREE *, EPGNO *));
-int	 __bt_defcmp __P((const DBT *, const DBT *));
-size_t	 __bt_defpfx __P((const DBT *, const DBT *));
-int	 __bt_delete __P((const DB *, const DBT *, u_int));
-int	 __bt_dleaf __P((BTREE *, const DBT *, PAGE *, u_int));
-int	 __bt_fd __P((const DB *));
-int	 __bt_free __P((BTREE *, PAGE *));
-int	 __bt_get __P((const DB *, const DBT *, DBT *, u_int));
-PAGE	*__bt_new __P((BTREE *, pgno_t *));
-void	 __bt_pgin __P((void *, pgno_t, void *));
-void	 __bt_pgout __P((void *, pgno_t, void *));
-int	 __bt_push __P((BTREE *, pgno_t, int));
-int	 __bt_put __P((const DB *dbp, DBT *, const DBT *, u_int));
-int	 __bt_ret __P((BTREE *, EPG *, DBT *, DBT *, DBT *, DBT *, int));
-EPG	*__bt_search __P((BTREE *, const DBT *, int *));
-int	 __bt_seq __P((const DB *, DBT *, DBT *, u_int));
-void	 __bt_setcur __P((BTREE *, pgno_t, u_int));
-int	 __bt_split __P((BTREE *, PAGE *,
-	    const DBT *, const DBT *, int, size_t, u_int32_t));
-int	 __bt_sync __P((const DB *, u_int));
-
-int	 __ovfl_delete __P((BTREE *, void *));
-int	 __ovfl_get __P((BTREE *, void *, size_t *, void **, size_t *));
-int	 __ovfl_put __P((BTREE *, const DBT *, pgno_t *));
-
-#ifdef DEBUG
-void	 __bt_dnpage __P((DB *, pgno_t));
-void	 __bt_dpage __P((PAGE *));
-void	 __bt_dump __P((DB *));
-#endif
-#ifdef STATISTICS
-void	 __bt_stat __P((DB *));
-#endif