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-rw-r--r--lib/libc/db/btree/Makefile.inc7
-rw-r--r--lib/libc/db/btree/bt_close.c204
-rw-r--r--lib/libc/db/btree/bt_conv.c221
-rw-r--r--lib/libc/db/btree/bt_debug.c331
-rw-r--r--lib/libc/db/btree/bt_delete.c324
-rw-r--r--lib/libc/db/btree/bt_get.c238
-rw-r--r--lib/libc/db/btree/bt_open.c440
-rw-r--r--lib/libc/db/btree/bt_overflow.c224
-rw-r--r--lib/libc/db/btree/bt_page.c93
-rw-r--r--lib/libc/db/btree/bt_put.c318
-rw-r--r--lib/libc/db/btree/bt_search.c235
-rw-r--r--lib/libc/db/btree/bt_seq.c380
-rw-r--r--lib/libc/db/btree/bt_split.c825
-rw-r--r--lib/libc/db/btree/bt_stack.c92
-rw-r--r--lib/libc/db/btree/bt_utils.c247
-rw-r--r--lib/libc/db/btree/btree.h353
-rw-r--r--lib/libc/db/btree/extern.h70
17 files changed, 4602 insertions, 0 deletions
diff --git a/lib/libc/db/btree/Makefile.inc b/lib/libc/db/btree/Makefile.inc
new file mode 100644
index 0000000..71f8dfc
--- /dev/null
+++ b/lib/libc/db/btree/Makefile.inc
@@ -0,0 +1,7 @@
+# @(#)Makefile.inc 8.1 (Berkeley) 6/4/93
+
+.PATH: ${.CURDIR}/db/btree
+
+SRCS+= bt_close.c bt_conv.c bt_debug.c bt_delete.c bt_get.c bt_open.c \
+ bt_overflow.c bt_page.c bt_put.c bt_search.c bt_seq.c bt_split.c \
+ bt_stack.c bt_utils.c
diff --git a/lib/libc/db/btree/bt_close.c b/lib/libc/db/btree/bt_close.c
new file mode 100644
index 0000000..66d8fc1
--- /dev/null
+++ b/lib/libc/db/btree/bt_close.c
@@ -0,0 +1,204 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.3 (Berkeley) 2/21/94";
+#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;
+ }
+
+ /*
+ * Delete any already deleted record that we've been saving
+ * because the cursor pointed to it.
+ */
+ if (ISSET(t, B_DELCRSR) && __bt_crsrdel(t, &t->bt_bcursor))
+ return (RET_ERROR);
+
+ if (__bt_sync(dbp, 0) == RET_ERROR)
+ return (RET_ERROR);
+
+ if (mpool_close(t->bt_mp) == RET_ERROR)
+ return (RET_ERROR);
+
+ if (t->bt_stack)
+ free(t->bt_stack);
+ if (t->bt_kbuf)
+ free(t->bt_kbuf);
+ if (t->bt_dbuf)
+ free(t->bt_dbuf);
+
+ 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;
+ PAGE *h;
+ void *p;
+
+ 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 (ISSET(t, B_INMEM | B_RDONLY) || !ISSET(t, B_MODIFIED))
+ return (RET_SUCCESS);
+
+ if (ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR)
+ return (RET_ERROR);
+
+ /*
+ * Nastiness. If the cursor has been marked for deletion, but not
+ * actually deleted, we have to make a copy of the page, delete the
+ * key/data item, sync the file, and then restore the original page
+ * contents.
+ */
+ if (ISSET(t, B_DELCRSR)) {
+ if ((p = (void *)malloc(t->bt_psize)) == NULL)
+ return (RET_ERROR);
+ if ((h = mpool_get(t->bt_mp, t->bt_bcursor.pgno, 0)) == NULL)
+ return (RET_ERROR);
+ memmove(p, h, t->bt_psize);
+ if ((status =
+ __bt_dleaf(t, h, t->bt_bcursor.index)) == RET_ERROR)
+ goto ecrsr;
+ mpool_put(t->bt_mp, h, MPOOL_DIRTY);
+ }
+
+ if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS)
+ CLR(t, B_MODIFIED);
+
+ecrsr: if (ISSET(t, B_DELCRSR)) {
+ if ((h = mpool_get(t->bt_mp, t->bt_bcursor.pgno, 0)) == NULL)
+ return (RET_ERROR);
+ memmove(h, p, t->bt_psize);
+ free(p);
+ mpool_put(t->bt_mp, h, MPOOL_DIRTY);
+ }
+ 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.m_magic = BTREEMAGIC;
+ m.m_version = BTREEVERSION;
+ m.m_psize = t->bt_psize;
+ m.m_free = t->bt_free;
+ m.m_nrecs = t->bt_nrecs;
+ m.m_flags = t->bt_flags & SAVEMETA;
+
+ memmove(p, &m, sizeof(BTMETA));
+ mpool_put(t->bt_mp, p, MPOOL_DIRTY);
+ return (RET_SUCCESS);
+}
diff --git a/lib/libc/db/btree/bt_conv.c b/lib/libc/db/btree/bt_conv.c
new file mode 100644
index 0000000..eb49340
--- /dev/null
+++ b/lib/libc/db/btree/bt_conv.c
@@ -0,0 +1,221 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.2 (Berkeley) 2/21/94";
+#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 (!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(size_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(size_t);
+ P_32_SWAP(p);
+ p += sizeof(size_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(size_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 (!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(size_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(size_t);
+ P_32_SWAP(p);
+ p += sizeof(size_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(size_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); /* m_magic */
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p); /* m_version */
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p); /* m_psize */
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p); /* m_free */
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p); /* m_nrecs */
+ p += sizeof(u_int32_t);
+ P_32_SWAP(p); /* m_flags */
+ p += sizeof(u_int32_t);
+}
diff --git a/lib/libc/db/btree/bt_debug.c b/lib/libc/db/btree/bt_debug.c
new file mode 100644
index 0000000..5f9ac1d
--- /dev/null
+++ b/lib/libc/db/btree/bt_debug.c
@@ -0,0 +1,331 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.2 (Berkeley) 2/21/94";
+#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",
+ ISSET(t, B_INMEM) ? "memory" : "disk", t->bt_psize);
+ if (ISSET(t, R_RECNO))
+ (void)fprintf(stderr, " keys %lu", t->bt_nrecs);
+#undef X
+#define X(flag, name) \
+ if (ISSET(t, flag)) { \
+ (void)fprintf(stderr, "%s%s", sep, name); \
+ sep = ", "; \
+ }
+ if (t->bt_flags) {
+ sep = " flags (";
+ X(B_DELCRSR, "DELCRSR");
+ X(R_FIXLEN, "FIXLEN");
+ X(B_INMEM, "INMEM");
+ X(B_NODUPS, "NODUPS");
+ X(B_RDONLY, "RDONLY");
+ X(R_RECNO, "RECNO");
+ X(B_SEQINIT, "SEQINIT");
+ 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->m_magic);
+ (void)fprintf(stderr, "version %lu\n", m->m_version);
+ (void)fprintf(stderr, "psize %lu\n", m->m_psize);
+ (void)fprintf(stderr, "free %lu\n", m->m_free);
+ (void)fprintf(stderr, "nrecs %lu\n", m->m_nrecs);
+ (void)fprintf(stderr, "flags %lu", m->m_flags);
+#undef X
+#define X(flag, name) \
+ if (m->m_flags & flag) { \
+ (void)fprintf(stderr, "%s%s", sep, name); \
+ sep = ", "; \
+ }
+ if (m->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,
+ *(size_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),
+ *(size_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,
+ *(size_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 = 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 (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/lib/libc/db/btree/bt_delete.c b/lib/libc/db/btree/bt_delete.c
new file mode 100644
index 0000000..5dba534
--- /dev/null
+++ b/lib/libc/db/btree/bt_delete.c
@@ -0,0 +1,324 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.3 (Berkeley) 2/21/94";
+#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 *));
+
+/*
+ * __BT_DELETE -- Delete the item(s) referenced by a key.
+ *
+ * Parameters:
+ * dbp: pointer to access method
+ * key: key to delete
+ * flags: R_CURSOR if deleting what the cursor references
+ *
+ * Returns:
+ * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
+ */
+int
+__bt_delete(dbp, key, flags)
+ const DB *dbp;
+ const DBT *key;
+ 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;
+ }
+
+ if (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 the record. For
+ * the delete cursor bit to have been set requires that the
+ * scan be initialized, so no reason to check.
+ */
+ if (!ISSET(t, B_SEQINIT))
+ goto einval;
+ status = ISSET(t, B_DELCRSR) ?
+ RET_SPECIAL : __bt_crsrdel(t, &t->bt_bcursor);
+ break;
+ default:
+einval: errno = EINVAL;
+ return (RET_ERROR);
+ }
+ if (status == RET_SUCCESS)
+ SET(t, B_MODIFIED);
+ return (status);
+}
+
+/*
+ * BT_BDELETE -- Delete all key/data pairs matching the specified key.
+ *
+ * Parameters:
+ * tree: 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, save;
+ PAGE *h;
+ pgno_t cpgno, pg;
+ indx_t cindex;
+ int deleted, dirty1, dirty2, exact;
+
+ /* Find any matching record; __bt_search pins the page. */
+ if ((e = __bt_search(t, key, &exact)) == NULL)
+ return (RET_ERROR);
+ if (!exact) {
+ mpool_put(t->bt_mp, e->page, 0);
+ return (RET_SPECIAL);
+ }
+
+ /*
+ * Delete forward, then delete backward, from the found key. The
+ * ordering is so that the deletions don't mess up the page refs.
+ * The first loop deletes the key from the original page, the second
+ * unpins the original page. In the first loop, dirty1 is set if
+ * the original page is modified, and dirty2 is set if any subsequent
+ * pages are modified. In the second loop, dirty1 starts off set if
+ * the original page has been modified, and is set if any subsequent
+ * pages are modified.
+ *
+ * If find the key referenced by the cursor, don't delete it, just
+ * flag it for future deletion. The cursor page number is P_INVALID
+ * unless the sequential scan is initialized, so no reason to check.
+ * A special case is when the already deleted cursor record was the
+ * only record found. If so, then the delete opertion fails as no
+ * records were deleted.
+ *
+ * Cycle in place in the current page until the current record doesn't
+ * match the key or the page is empty. If the latter, walk forward,
+ * skipping empty pages and repeating until a record doesn't match
+ * the key or the end of the tree is reached.
+ */
+ cpgno = t->bt_bcursor.pgno;
+ cindex = t->bt_bcursor.index;
+ save = *e;
+ dirty1 = 0;
+ for (h = e->page, deleted = 0;;) {
+ dirty2 = 0;
+ do {
+ if (h->pgno == cpgno && e->index == cindex) {
+ if (!ISSET(t, B_DELCRSR)) {
+ SET(t, B_DELCRSR);
+ deleted = 1;
+ }
+ ++e->index;
+ } else {
+ if (__bt_dleaf(t, h, e->index)) {
+ if (h->pgno != save.page->pgno)
+ mpool_put(t->bt_mp, h, dirty2);
+ mpool_put(t->bt_mp, save.page, dirty1);
+ return (RET_ERROR);
+ }
+ if (h->pgno == save.page->pgno)
+ dirty1 = MPOOL_DIRTY;
+ else
+ dirty2 = MPOOL_DIRTY;
+ deleted = 1;
+ }
+ } while (e->index < NEXTINDEX(h) && __bt_cmp(t, key, e) == 0);
+
+ /*
+ * Quit if didn't find a match, no next page, or first key on
+ * the next page doesn't match. Don't unpin the original page
+ * unless an error occurs.
+ */
+ if (e->index < NEXTINDEX(h))
+ break;
+ for (;;) {
+ if ((pg = h->nextpg) == P_INVALID)
+ goto done1;
+ if (h->pgno != save.page->pgno)
+ mpool_put(t->bt_mp, h, dirty2);
+ if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL) {
+ mpool_put(t->bt_mp, save.page, dirty1);
+ return (RET_ERROR);
+ }
+ if (NEXTINDEX(h) != 0) {
+ e->page = h;
+ e->index = 0;
+ break;
+ }
+ }
+
+ if (__bt_cmp(t, key, e) != 0)
+ break;
+ }
+
+ /*
+ * Reach here with the original page and the last page referenced
+ * pinned (they may be the same). Release it if not the original.
+ */
+done1: if (h->pgno != save.page->pgno)
+ mpool_put(t->bt_mp, h, dirty2);
+
+ /*
+ * Walk backwards from the record previous to the record returned by
+ * __bt_search, skipping empty pages, until a record doesn't match
+ * the key or reach the beginning of the tree.
+ */
+ *e = save;
+ for (;;) {
+ if (e->index)
+ --e->index;
+ for (h = e->page; e->index; --e->index) {
+ if (__bt_cmp(t, key, e) != 0)
+ goto done2;
+ if (h->pgno == cpgno && e->index == cindex) {
+ if (!ISSET(t, B_DELCRSR)) {
+ SET(t, B_DELCRSR);
+ deleted = 1;
+ }
+ } else {
+ if (__bt_dleaf(t, h, e->index) == RET_ERROR) {
+ mpool_put(t->bt_mp, h, dirty1);
+ return (RET_ERROR);
+ }
+ if (h->pgno == save.page->pgno)
+ dirty1 = MPOOL_DIRTY;
+ deleted = 1;
+ }
+ }
+
+ if ((pg = h->prevpg) == P_INVALID)
+ goto done2;
+ mpool_put(t->bt_mp, h, dirty1);
+ dirty1 = 0;
+ if ((e->page = mpool_get(t->bt_mp, pg, 0)) == NULL)
+ return (RET_ERROR);
+ e->index = NEXTINDEX(e->page);
+ }
+
+ /*
+ * Reach here with the last page that was looked at pinned. Release
+ * it.
+ */
+done2: mpool_put(t->bt_mp, h, dirty1);
+ return (deleted ? RET_SUCCESS : RET_SPECIAL);
+}
+
+/*
+ * __BT_DLEAF -- Delete a single record from a leaf page.
+ *
+ * Parameters:
+ * t: tree
+ * index: index on current page to delete
+ *
+ * Returns:
+ * RET_SUCCESS, RET_ERROR.
+ */
+int
+__bt_dleaf(t, h, index)
+ BTREE *t;
+ PAGE *h;
+ indx_t index;
+{
+ register BLEAF *bl;
+ register indx_t cnt, *ip, offset;
+ register size_t nbytes;
+ char *from;
+ void *to;
+
+ /*
+ * Delete a record from a btree leaf page. Internal records are never
+ * deleted from internal pages, regardless of the records that caused
+ * them to be added being deleted. Pages made empty by deletion are
+ * not reclaimed. They are, however, made available for reuse.
+ *
+ * Pack the remaining entries at the end of the page, shift the indices
+ * down, overwriting the deleted record and its index. If the record
+ * 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);
+ nbytes = NBLEAF(bl);
+
+ /*
+ * Compress the key/data pairs. Compress and adjust the [BR]LEAF
+ * offsets. Reset the headers.
+ */
+ from = (char *)h + h->upper;
+ memmove(from + nbytes, from, (char *)to - from);
+ h->upper += nbytes;
+
+ 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);
+ return (RET_SUCCESS);
+}
diff --git a/lib/libc/db/btree/bt_get.c b/lib/libc/db/btree/bt_get.c
new file mode 100644
index 0000000..28b2d60
--- /dev/null
+++ b/lib/libc/db/btree/bt_get.c
@@ -0,0 +1,238 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.2 (Berkeley) 9/7/93";
+#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);
+ }
+
+ /*
+ * A special case is if we found the record but it's flagged for
+ * deletion. In this case, we want to find another record with the
+ * same key, if it exists. Rather than look around the tree we call
+ * __bt_first and have it redo the search, as __bt_first will not
+ * return keys marked for deletion. Slow, but should never happen.
+ */
+ if (ISSET(t, B_DELCRSR) && e->page->pgno == t->bt_bcursor.pgno &&
+ e->index == t->bt_bcursor.index) {
+ mpool_put(t->bt_mp, e->page, 0);
+ if ((e = __bt_first(t, key, &exact)) == NULL)
+ return (RET_ERROR);
+ if (!exact)
+ return (RET_SPECIAL);
+ }
+
+ status = __bt_ret(t, e, NULL, data);
+ /*
+ * If the user is doing concurrent access, we copied the
+ * key/data, toss the page.
+ */
+ if (ISSET(t, B_DB_LOCK))
+ mpool_put(t->bt_mp, e->page, 0);
+ else
+ t->bt_pinned = e->page;
+ return (status);
+}
+
+/*
+ * __BT_FIRST -- Find the first entry.
+ *
+ * Parameters:
+ * t: the tree
+ * key: the key
+ *
+ * Returns:
+ * The first entry in the tree greater than or equal to key.
+ */
+EPG *
+__bt_first(t, key, exactp)
+ BTREE *t;
+ const DBT *key;
+ int *exactp;
+{
+ register PAGE *h;
+ register EPG *e;
+ EPG save;
+ pgno_t cpgno, pg;
+ indx_t cindex;
+ int found;
+
+ /*
+ * Find any matching record; __bt_search pins the page. Only exact
+ * matches are tricky, otherwise just return the location of the key
+ * if it were to be inserted into the tree.
+ */
+ if ((e = __bt_search(t, key, exactp)) == NULL)
+ return (NULL);
+ if (!*exactp)
+ return (e);
+
+ if (ISSET(t, B_DELCRSR)) {
+ cpgno = t->bt_bcursor.pgno;
+ cindex = t->bt_bcursor.index;
+ } else {
+ cpgno = P_INVALID;
+ cindex = 0; /* GCC thinks it's uninitialized. */
+ }
+
+ /*
+ * Walk backwards, skipping empty pages, 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. A special case is that we don't return a match
+ * on records that the cursor references that have already been flagged
+ * for deletion.
+ */
+ save = *e;
+ h = e->page;
+ found = 0;
+ do {
+ if (cpgno != h->pgno || cindex != e->index) {
+ if (save.page->pgno != e->page->pgno) {
+ mpool_put(t->bt_mp, save.page, 0);
+ save = *e;
+ } else
+ save.index = e->index;
+ found = 1;
+ }
+ /*
+ * Make a special effort not to unpin the page the last (or
+ * original) match was on, but also make sure it's unpinned
+ * if an error occurs.
+ */
+ while (e->index == 0) {
+ if (h->prevpg == P_INVALID)
+ goto done1;
+ 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 (NULL);
+ }
+ e->page = h;
+ e->index = NEXTINDEX(h);
+ }
+ --e->index;
+ } while (__bt_cmp(t, key, e) == 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.
+ */
+done1: if (h->pgno != save.page->pgno)
+ mpool_put(t->bt_mp, h, 0);
+
+ /*
+ * If still haven't found a record, the only possibility left is the
+ * next one. Move forward one slot, skipping empty pages and check.
+ */
+ if (!found) {
+ h = save.page;
+ if (++save.index == NEXTINDEX(h)) {
+ do {
+ pg = h->nextpg;
+ mpool_put(t->bt_mp, h, 0);
+ if (pg == P_INVALID) {
+ *exactp = 0;
+ return (e);
+ }
+ if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
+ return (NULL);
+ } while ((save.index = NEXTINDEX(h)) == 0);
+ save.page = h;
+ }
+ if (__bt_cmp(t, key, &save) != 0) {
+ *exactp = 0;
+ return (e);
+ }
+ }
+ *e = save;
+ *exactp = 1;
+ return (e);
+}
diff --git a/lib/libc/db/btree/bt_open.c b/lib/libc/db/btree/bt_open.c
new file mode 100644
index 0000000..ec79cf7
--- /dev/null
+++ b/lib/libc/db/btree/bt_open.c
@@ -0,0 +1,440 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.5 (Berkeley) 2/21/94";
+#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"
+
+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_bcursor.pgno = P_INVALID;
+ 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;
+ t->bt_flags = 0;
+ if (t->bt_lorder != machine_lorder)
+ 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:
+ 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;
+ 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) {
+ nr = read(t->bt_fd, &m, sizeof(BTMETA));
+ if (nr < 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.m_magic == BTREEMAGIC)
+ CLR(t, B_NEEDSWAP);
+ else {
+ SET(t, B_NEEDSWAP);
+ M_32_SWAP(m.m_magic);
+ M_32_SWAP(m.m_version);
+ M_32_SWAP(m.m_psize);
+ M_32_SWAP(m.m_free);
+ M_32_SWAP(m.m_nrecs);
+ M_32_SWAP(m.m_flags);
+ }
+ if (m.m_magic != BTREEMAGIC || m.m_version != BTREEVERSION)
+ goto eftype;
+ if (m.m_psize < MINPSIZE || m.m_psize > MAX_PAGE_OFFSET + 1 ||
+ m.m_psize & sizeof(indx_t) - 1)
+ goto eftype;
+ if (m.m_flags & ~SAVEMETA)
+ goto eftype;
+ b.psize = m.m_psize;
+ t->bt_flags |= m.m_flags;
+ t->bt_free = m.m_free;
+ t->bt_nrecs = m.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) {
+ b.psize = sb.st_blksize;
+ 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))
+ SET(t, B_NODUPS);
+
+ t->bt_free = P_INVALID;
+ t->bt_nrecs = 0;
+ 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 (!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)
+ SET(t, B_DB_LOCK);
+ if (dflags & DB_SHMEM)
+ SET(t, B_DB_SHMEM);
+ if (dflags & DB_TXN)
+ 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)
+ return (RET_ERROR);
+
+ 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;
+ char *envtmp;
+ char path[MAXPATHLEN];
+
+ envtmp = getenv("TMPDIR");
+ (void)snprintf(path,
+ sizeof(path), "%s/bt.XXXXXX", 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);
+ 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 (ISSET(t, B_INMEM)) {
+ errno = ENOENT;
+ return (-1);
+ }
+ return (t->bt_fd);
+}
diff --git a/lib/libc/db/btree/bt_overflow.c b/lib/libc/db/btree/bt_overflow.c
new file mode 100644
index 0000000..0057a03
--- /dev/null
+++ b/lib/libc/db/btree/bt_overflow.c
@@ -0,0 +1,224 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.2 (Berkeley) 2/21/94";
+#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, size_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;
+ char **buf;
+ size_t *bufsz;
+{
+ PAGE *h;
+ pgno_t pg;
+ size_t nb, plen, sz;
+
+ memmove(&pg, p, sizeof(pgno_t));
+ memmove(&sz, (char *)p + sizeof(pgno_t), sizeof(size_t));
+ *ssz = sz;
+
+#ifdef DEBUG
+ if (pg == P_INVALID || sz == 0)
+ abort();
+#endif
+ /* Make the buffer bigger as necessary. */
+ if (*bufsz < sz) {
+ if ((*buf = (char *)realloc(*buf, sz)) == 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, 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, size_t }
+ *
+ * Returns:
+ * RET_ERROR, RET_SUCCESS
+ */
+int
+__ovfl_delete(t, p)
+ BTREE *t;
+ void *p;
+{
+ PAGE *h;
+ pgno_t pg;
+ size_t plen, sz;
+
+ memmove(&pg, p, sizeof(pgno_t));
+ memmove(&sz, (char *)p + sizeof(pgno_t), sizeof(size_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/lib/libc/db/btree/bt_page.c b/lib/libc/db/btree/bt_page.c
new file mode 100644
index 0000000..f71a40d
--- /dev/null
+++ b/lib/libc/db/btree/bt_page.c
@@ -0,0 +1,93 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.2 (Berkeley) 2/21/94";
+#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
+ */
+int
+__bt_free(t, h)
+ BTREE *t;
+ PAGE *h;
+{
+ /* Insert the page at the start of the free list. */
+ h->prevpg = P_INVALID;
+ h->nextpg = t->bt_free;
+ t->bt_free = h->pgno;
+
+ /* 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;
+ return (h);
+ }
+ return (mpool_new(t->bt_mp, npg));
+}
diff --git a/lib/libc/db/btree/bt_put.c b/lib/libc/db/btree/bt_put.c
new file mode 100644
index 0000000..11a211b
--- /dev/null
+++ b/lib/libc/db/btree/bt_put.c
@@ -0,0 +1,318 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.3 (Berkeley) 9/16/93";
+#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;
+ size_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;
+ }
+
+ switch (flags) {
+ case R_CURSOR:
+ if (!ISSET(t, B_SEQINIT))
+ goto einval;
+ if (ISSET(t, B_DELCRSR))
+ goto einval;
+ break;
+ case 0:
+ case R_NOOVERWRITE:
+ break;
+ default:
+einval: errno = EINVAL;
+ return (RET_ERROR);
+ }
+
+ if (ISSET(t, B_RDONLY)) {
+ errno = EPERM;
+ return (RET_ERROR);
+ }
+
+ /*
+ * If the key/data won't fit on a page, store it on indirect pages.
+ * Only store the key on the overflow page if it's too big after the
+ * data is on an overflow page.
+ *
+ * XXX
+ * If the insert fails later on, these 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(size_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(size_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_bcursor.pgno, 0)) == NULL)
+ return (RET_ERROR);
+ index = t->bt_bcursor.index;
+ goto delete;
+ }
+
+ /*
+ * Find the key to delete, or, the location at which to insert. Bt_fast
+ * and __bt_search 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 specified 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.
+ *
+ * Pages are split as required.
+ */
+ switch (flags) {
+ case R_NOOVERWRITE:
+ if (!exact)
+ break;
+ /*
+ * One special case is if the cursor references the record and
+ * it's been flagged for deletion. Then, we delete the record,
+ * leaving the cursor there -- this means that the inserted
+ * record will not be seen in a cursor scan.
+ */
+ if (ISSET(t, B_DELCRSR) && t->bt_bcursor.pgno == h->pgno &&
+ t->bt_bcursor.index == index) {
+ CLR(t, B_DELCRSR);
+ goto delete;
+ }
+ mpool_put(t->bt_mp, h, 0);
+ return (RET_SPECIAL);
+ default:
+ if (!exact || !ISSET(t, B_NODUPS))
+ break;
+delete: if (__bt_dleaf(t, 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 (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 (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) {
+ t->bt_bcursor.pgno = e->page->pgno;
+ t->bt_bcursor.index = e->index;
+ }
+ 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;
+ size_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 (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/lib/libc/db/btree/bt_search.c b/lib/libc/db/btree/bt_search.c
new file mode 100644
index 0000000..ff33421
--- /dev/null
+++ b/lib/libc/db/btree/bt_search.c
@@ -0,0 +1,235 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.6 (Berkeley) 3/15/94";
+#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, and duplicates aren't allowed, we're
+ * done. If duplicates are allowed, it's possible that there
+ * were duplicate keys on duplicate pages, and they were later
+ * deleted, so we could be on a page with no matches while
+ * there are matches on other pages. If we're at the start or
+ * end of a page, check on both sides.
+ */
+ if (h->flags & P_BLEAF) {
+ t->bt_cur.index = base;
+ *exactp = 0;
+ if (!ISSET(t, B_NODUPS)) {
+ if (base == 0 &&
+ bt_sprev(t, h, key, exactp))
+ return (&t->bt_cur);
+ if (base == NEXTINDEX(h) &&
+ bt_snext(t, h, key, exactp))
+ return (&t->bt_cur);
+ }
+ 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: if (__bt_push(t, h->pgno, index) == RET_ERROR)
+ return (NULL);
+ 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 to search
+ * h: current page.
+ * key: key to find
+ * 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;
+ PAGE *tp;
+ pgno_t pg;
+
+ /* Skip until reach the end of the tree or a key. */
+ for (pg = h->nextpg; pg != P_INVALID;) {
+ if ((tp = mpool_get(t->bt_mp, pg, 0)) == NULL) {
+ mpool_put(t->bt_mp, h, 0);
+ return (NULL);
+ }
+ if (NEXTINDEX(tp) != 0)
+ break;
+ pg = tp->prevpg;
+ mpool_put(t->bt_mp, tp, 0);
+ }
+ /*
+ * The key is either an exact match, or not as good as
+ * the one we already have.
+ */
+ if (pg != P_INVALID) {
+ e.page = tp;
+ e.index = NEXTINDEX(tp) - 1;
+ if (__bt_cmp(t, key, &e) == 0) {
+ mpool_put(t->bt_mp, h, 0);
+ t->bt_cur = e;
+ *exactp = 1;
+ return (1);
+ }
+ }
+ return (0);
+}
+
+/*
+ * BT_SPREV -- Check for an exact match before the key.
+ *
+ * Parameters:
+ * t: tree to search
+ * h: current page.
+ * key: key to find
+ * 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;
+ PAGE *tp;
+ pgno_t pg;
+
+ /* Skip until reach the beginning of the tree or a key. */
+ for (pg = h->prevpg; pg != P_INVALID;) {
+ if ((tp = mpool_get(t->bt_mp, pg, 0)) == NULL) {
+ mpool_put(t->bt_mp, h, 0);
+ return (NULL);
+ }
+ if (NEXTINDEX(tp) != 0)
+ break;
+ pg = tp->prevpg;
+ mpool_put(t->bt_mp, tp, 0);
+ }
+ /*
+ * The key is either an exact match, or not as good as
+ * the one we already have.
+ */
+ if (pg != P_INVALID) {
+ e.page = tp;
+ e.index = NEXTINDEX(tp) - 1;
+ if (__bt_cmp(t, key, &e) == 0) {
+ mpool_put(t->bt_mp, h, 0);
+ t->bt_cur = e;
+ *exactp = 1;
+ return (1);
+ }
+ }
+ return (0);
+}
diff --git a/lib/libc/db/btree/bt_seq.c b/lib/libc/db/btree/bt_seq.c
new file mode 100644
index 0000000..182ef70
--- /dev/null
+++ b/lib/libc/db/btree/bt_seq.c
@@ -0,0 +1,380 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.2 (Berkeley) 9/7/93";
+#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_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.
+ *
+ * Each tree has an EPGNO which has the current position of the cursor. The
+ * cursor has to survive deletions/insertions in the tree without losing its
+ * position. This is done by noting deletions without doing them, and then
+ * doing them when the cursor moves (or the tree is closed).
+ */
+
+/*
+ * __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 unitialized 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 (ISSET(t, B_SEQINIT)) {
+ status = bt_seqadv(t, &e, flags);
+ break;
+ }
+ /* FALLTHROUGH */
+ case R_CURSOR:
+ case R_FIRST:
+ case R_LAST:
+ status = bt_seqset(t, &e, key, flags);
+ break;
+ default:
+ errno = EINVAL;
+ return (RET_ERROR);
+ }
+
+ if (status == RET_SUCCESS) {
+ status = __bt_ret(t, &e, key, data);
+
+ /* Update the actual cursor. */
+ t->bt_bcursor.pgno = e.page->pgno;
+ t->bt_bcursor.index = e.index;
+
+ /*
+ * If the user is doing concurrent access, we copied the
+ * key/data, toss the page.
+ */
+ if (ISSET(t, B_DB_LOCK))
+ mpool_put(t->bt_mp, e.page, 0);
+ else
+ t->bt_pinned = e.page;
+ SET(t, B_SEQINIT);
+ }
+ 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;
+{
+ EPG *e;
+ PAGE *h;
+ pgno_t pg;
+ int exact;
+
+ /*
+ * Delete any already deleted record that we've been saving because
+ * the cursor pointed to it. Since going to a specific key, should
+ * delete any logically deleted records so they aren't found.
+ */
+ if (ISSET(t, B_DELCRSR) && __bt_crsrdel(t, &t->bt_bcursor))
+ return (RET_ERROR);
+
+ /*
+ * 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 run out
+ * of keys, return RET_SPECIAL.
+ */
+ if (key->data == NULL || key->size == 0) {
+ errno = EINVAL;
+ return (RET_ERROR);
+ }
+ e = __bt_first(t, key, &exact); /* Returns pinned page. */
+ if (e == NULL)
+ return (RET_ERROR);
+ /*
+ * If at the end of a page, skip any empty pages and find the
+ * next entry.
+ */
+ if (e->index == NEXTINDEX(e->page)) {
+ h = e->page;
+ do {
+ 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);
+ } while (NEXTINDEX(h) == 0);
+ e->index = 0;
+ e->page = h;
+ }
+ *ep = *e;
+ break;
+ 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);
+ if (h->flags & (P_BLEAF | P_RLEAF))
+ break;
+ pg = GETBINTERNAL(h, 0)->pgno;
+ mpool_put(t->bt_mp, h, 0);
+ }
+
+ /* Skip any empty pages. */
+ while (NEXTINDEX(h) == 0 && h->nextpg != P_INVALID) {
+ pg = h->nextpg;
+ mpool_put(t->bt_mp, h, 0);
+ if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
+ return (RET_ERROR);
+ }
+
+ if (NEXTINDEX(h) == 0) {
+ mpool_put(t->bt_mp, h, 0);
+ return (RET_SPECIAL);
+ }
+
+ 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);
+ if (h->flags & (P_BLEAF | P_RLEAF))
+ break;
+ pg = GETBINTERNAL(h, NEXTINDEX(h) - 1)->pgno;
+ mpool_put(t->bt_mp, h, 0);
+ }
+
+ /* Skip any empty pages. */
+ while (NEXTINDEX(h) == 0 && h->prevpg != P_INVALID) {
+ pg = h->prevpg;
+ mpool_put(t->bt_mp, h, 0);
+ if ((h = mpool_get(t->bt_mp, pg, 0)) == NULL)
+ return (RET_ERROR);
+ }
+
+ if (NEXTINDEX(h) == 0) {
+ mpool_put(t->bt_mp, h, 0);
+ return (RET_SPECIAL);
+ }
+
+ 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, e, flags)
+ BTREE *t;
+ EPG *e;
+ int flags;
+{
+ EPGNO *c, delc;
+ PAGE *h;
+ indx_t index;
+ pgno_t pg;
+
+ /* Save the current cursor if going to delete it. */
+ c = &t->bt_bcursor;
+ if (ISSET(t, B_DELCRSR))
+ delc = *c;
+
+ if ((h = mpool_get(t->bt_mp, c->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.
+ */
+ index = c->index;
+ switch(flags) {
+ case R_NEXT: /* Next record. */
+ if (++index == NEXTINDEX(h)) {
+ do {
+ 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);
+ } while (NEXTINDEX(h) == 0);
+ index = 0;
+ }
+ break;
+ case R_PREV: /* Previous record. */
+ if (index-- == 0) {
+ do {
+ 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);
+ } while (NEXTINDEX(h) == 0);
+ index = NEXTINDEX(h) - 1;
+ }
+ break;
+ }
+
+ e->page = h;
+ e->index = index;
+
+ /*
+ * Delete any already deleted record that we've been saving because the
+ * cursor pointed to it. This could cause the new index to be shifted
+ * down by one if the record we're deleting is on the same page and has
+ * a larger index.
+ */
+ if (ISSET(t, B_DELCRSR)) {
+ CLR(t, B_DELCRSR); /* Don't try twice. */
+ if (c->pgno == delc.pgno && c->index > delc.index)
+ --c->index;
+ if (__bt_crsrdel(t, &delc))
+ return (RET_ERROR);
+ }
+ return (RET_SUCCESS);
+}
+
+/*
+ * __BT_CRSRDEL -- Delete the record referenced by the cursor.
+ *
+ * Parameters:
+ * t: tree
+ *
+ * Returns:
+ * RET_ERROR, RET_SUCCESS
+ */
+int
+__bt_crsrdel(t, c)
+ BTREE *t;
+ EPGNO *c;
+{
+ PAGE *h;
+ int status;
+
+ CLR(t, B_DELCRSR); /* Don't try twice. */
+ if ((h = mpool_get(t->bt_mp, c->pgno, 0)) == NULL)
+ return (RET_ERROR);
+ status = __bt_dleaf(t, h, c->index);
+ mpool_put(t->bt_mp, h, MPOOL_DIRTY);
+ return (status);
+}
diff --git a/lib/libc/db/btree/bt_split.c b/lib/libc/db/btree/bt_split.c
new file mode 100644
index 0000000..4a572c0
--- /dev/null
+++ b/lib/libc/db/btree/bt_split.c
@@ -0,0 +1,825 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.3 (Berkeley) 2/21/94";
+#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, skip)
+ BTREE *t;
+ PAGE *sp;
+ const DBT *key, *data;
+ int flags;
+ size_t ilen;
+ indx_t skip;
+{
+ BINTERNAL *bi;
+ BLEAF *bl, *tbl;
+ DBT a, b;
+ EPGNO *parent;
+ PAGE *h, *l, *r, *lchild, *rchild;
+ indx_t nxtindex;
+ size_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.
+ */
+ 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 (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 &&
+ (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 (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 &&
+ (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);
+ }
+ 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, 0);
+ }
+
+ /*
+ * 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;
+ size_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;
+ RLEAF *rl;
+ EPGNO *c;
+ PAGE *rval;
+ void *src;
+ indx_t full, half, nxt, off, skip, top, used;
+ size_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 >= full) {
+ --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;
+ 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.
+ *
+ * Don't bother checking for the B_SEQINIT flag, the page number will
+ * be P_INVALID.
+ */
+ c = &t->bt_bcursor;
+ if (c->pgno == h->pgno) {
+ if (c->index >= skip)
+ ++c->index;
+ if (c->index < nxt) /* Left page. */
+ c->pgno = l->pgno;
+ else { /* Right page. */
+ c->pgno = r->pgno;
+ c->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/lib/libc/db/btree/bt_stack.c b/lib/libc/db/btree/bt_stack.c
new file mode 100644
index 0000000..5c7fab9
--- /dev/null
+++ b/lib/libc/db/btree/bt_stack.c
@@ -0,0 +1,92 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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_stack.c 8.3 (Berkeley) 2/21/94";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <db.h>
+#include "btree.h"
+
+/*
+ * When a page splits, a new record has to be inserted into its parent page.
+ * This page may have to split as well, all the way up to the root. Since
+ * parent pointers in each page would be expensive, we maintain a stack of
+ * parent pages as we descend the tree.
+ *
+ * XXX
+ * This is a concurrency problem -- if user a builds a stack, then user b
+ * splits the tree, then user a tries to split the tree, there's a new level
+ * in the tree that user a doesn't know about.
+ */
+
+/*
+ * __BT_PUSH -- Push parent page info onto the stack (LIFO).
+ *
+ * Parameters:
+ * t: tree
+ * pgno: page
+ * index: page index
+ *
+ * Returns:
+ * RET_ERROR, RET_SUCCESS
+ */
+int
+__bt_push(t, pgno, index)
+ BTREE *t;
+ pgno_t pgno;
+ indx_t index;
+{
+ if (t->bt_sp == t->bt_maxstack) {
+ t->bt_maxstack += 50;
+ if ((t->bt_stack = (EPGNO *)realloc(t->bt_stack,
+ t->bt_maxstack * sizeof(EPGNO))) == NULL) {
+ t->bt_maxstack -= 50;
+ return (RET_ERROR);
+ }
+ }
+
+ t->bt_stack[t->bt_sp].pgno = pgno;
+ t->bt_stack[t->bt_sp].index = index;
+ ++t->bt_sp;
+ return (RET_SUCCESS);
+}
diff --git a/lib/libc/db/btree/bt_utils.c b/lib/libc/db/btree/bt_utils.c
new file mode 100644
index 0000000..d2d1f73
--- /dev/null
+++ b/lib/libc/db/btree/bt_utils.c
@@ -0,0 +1,247 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * 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 8.4 (Berkeley) 2/21/94";
+#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 as a result of search or scan.
+ *
+ * Parameters:
+ * t: tree
+ * d: LEAF to be returned to the user.
+ * key: user's key structure (NULL if not to be filled in)
+ * data: user's data structure
+ *
+ * Returns:
+ * RET_SUCCESS, RET_ERROR.
+ */
+int
+__bt_ret(t, e, key, data)
+ BTREE *t;
+ EPG *e;
+ DBT *key, *data;
+{
+ register BLEAF *bl;
+ register void *p;
+
+ bl = GETBLEAF(e->page, e->index);
+
+ /*
+ * We always copy big keys/data to make them contigous. Otherwise,
+ * we leave the page pinned and don't copy unless the user specified
+ * concurrent access.
+ */
+ if (bl->flags & P_BIGDATA) {
+ if (__ovfl_get(t, bl->bytes + bl->ksize,
+ &data->size, &t->bt_dbuf, &t->bt_dbufsz))
+ return (RET_ERROR);
+ data->data = t->bt_dbuf;
+ } else if (ISSET(t, B_DB_LOCK)) {
+ /* Use +1 in case the first record retrieved is 0 length. */
+ if (bl->dsize + 1 > t->bt_dbufsz) {
+ if ((p =
+ (void *)realloc(t->bt_dbuf, bl->dsize + 1)) == NULL)
+ return (RET_ERROR);
+ t->bt_dbuf = p;
+ t->bt_dbufsz = bl->dsize + 1;
+ }
+ memmove(t->bt_dbuf, bl->bytes + bl->ksize, bl->dsize);
+ data->size = bl->dsize;
+ data->data = t->bt_dbuf;
+ } else {
+ data->size = bl->dsize;
+ data->data = bl->bytes + bl->ksize;
+ }
+
+ if (key == NULL)
+ return (RET_SUCCESS);
+
+ if (bl->flags & P_BIGKEY) {
+ if (__ovfl_get(t, bl->bytes,
+ &key->size, &t->bt_kbuf, &t->bt_kbufsz))
+ return (RET_ERROR);
+ key->data = t->bt_kbuf;
+ } else if (ISSET(t, B_DB_LOCK)) {
+ if (bl->ksize > t->bt_kbufsz) {
+ if ((p =
+ (void *)realloc(t->bt_kbuf, bl->ksize)) == NULL)
+ return (RET_ERROR);
+ t->bt_kbuf = p;
+ t->bt_kbufsz = bl->ksize;
+ }
+ memmove(t->bt_kbuf, bl->bytes, bl->ksize);
+ key->size = bl->ksize;
+ key->data = t->bt_kbuf;
+ } else {
+ key->size = bl->ksize;
+ key->data = bl->bytes;
+ }
+ 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_dbuf, &t->bt_dbufsz))
+ return (RET_ERROR);
+ k2.data = t->bt_dbuf;
+ }
+ 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/lib/libc/db/btree/btree.h b/lib/libc/db/btree/btree.h
new file mode 100644
index 0000000..dd798ec
--- /dev/null
+++ b/lib/libc/db/btree/btree.h
@@ -0,0 +1,353 @@
+/*-
+ * Copyright (c) 1991, 1993
+ * 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 8.5 (Berkeley) 2/21/94
+ */
+
+#include <mpool.h>
+
+#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(size_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 {
+ size_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(size_t) + sizeof(pgno_t) + sizeof(u_char) + (len))
+
+/* Copy a BINTERNAL entry to the page. */
+#define WR_BINTERNAL(p, size, pgno, flags) { \
+ *(size_t *)p = size; \
+ p += sizeof(size_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 RINTERAL 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 {
+ size_t ksize; /* size of key */
+ size_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(size_t) + sizeof(size_t) + sizeof(u_char) + \
+ (ksize) + (dsize))
+
+/* Copy a BLEAF entry to the page. */
+#define WR_BLEAF(p, key, data, flags) { \
+ *(size_t *)p = key->size; \
+ p += sizeof(size_t); \
+ *(size_t *)p = data->size; \
+ p += sizeof(size_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 {
+ size_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(size_t) + sizeof(u_char) + (dsize))
+
+/* Copy a RLEAF entry to the page. */
+#define WR_RLEAF(p, data, flags) { \
+ *(size_t *)p = data->size; \
+ p += sizeof(size_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.
+ *
+ * One comment about cursors. The cursor key is never removed from the tree,
+ * even if deleted. This is because it is quite difficult to decide where the
+ * cursor should be when other keys have been inserted/deleted in the tree;
+ * duplicate keys make it impossible. This scheme does require extra work
+ * though, to make sure that we don't perform an operation on a deleted key.
+ */
+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;
+
+/*
+ * The metadata of the tree. The m_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 m_magic; /* magic number */
+ u_int32_t m_version; /* version */
+ u_int32_t m_psize; /* page size */
+ u_int32_t m_free; /* page number of first free page */
+ u_int32_t m_nrecs; /* R: number of records */
+#define SAVEMETA (B_NODUPS | R_RECNO)
+ u_int32_t m_flags; /* bt_flags & SAVEMETA */
+ u_int32_t m_unused; /* unused */
+} 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 */
+
+ EPGNO bt_bcursor; /* B: btree cursor */
+ recno_t bt_rcursor; /* R: recno cursor (1-based) */
+
+#define BT_POP(t) (t->bt_sp ? t->bt_stack + --t->bt_sp : NULL)
+#define BT_CLR(t) (t->bt_sp = 0)
+ EPGNO *bt_stack; /* stack of parent pages */
+ u_int bt_sp; /* current stack pointer */
+ u_int bt_maxstack; /* largest stack */
+
+ char *bt_kbuf; /* key buffer */
+ size_t bt_kbufsz; /* key buffer size */
+ char *bt_dbuf; /* data buffer */
+ size_t bt_dbufsz; /* data buffer size */
+
+ 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_DELCRSR 0x00001 /* cursor has been deleted */
+#define B_INMEM 0x00002 /* in-memory tree */
+#define B_METADIRTY 0x00004 /* need to write metadata */
+#define B_MODIFIED 0x00008 /* tree modified */
+#define B_NEEDSWAP 0x00010 /* if byte order requires swapping */
+#define B_NODUPS 0x00020 /* no duplicate keys permitted */
+#define B_RDONLY 0x00040 /* read-only tree */
+#define R_RECNO 0x00080 /* record oriented tree */
+#define B_SEQINIT 0x00100 /* sequential scan initialized */
+
+#define R_CLOSEFP 0x00200 /* opened a file pointer */
+#define R_EOF 0x00400 /* end of input file reached. */
+#define R_FIXLEN 0x00800 /* fixed length records */
+#define R_MEMMAPPED 0x01000 /* memory mapped file. */
+#define R_INMEM 0x02000 /* in-memory file */
+#define R_MODIFIED 0x04000 /* modified file */
+#define R_RDONLY 0x08000 /* read-only file */
+
+#define B_DB_LOCK 0x10000 /* DB_LOCK specified. */
+#define B_DB_SHMEM 0x20000 /* DB_SHMEM specified. */
+#define B_DB_TXN 0x40000 /* DB_TXN specified. */
+
+ u_int32_t bt_flags; /* btree state */
+} BTREE;
+
+#define SET(t, f) ((t)->bt_flags |= (f))
+#define CLR(t, f) ((t)->bt_flags &= ~(f))
+#define ISSET(t, f) ((t)->bt_flags & (f))
+
+#include "extern.h"
diff --git a/lib/libc/db/btree/extern.h b/lib/libc/db/btree/extern.h
new file mode 100644
index 0000000..4007bc7
--- /dev/null
+++ b/lib/libc/db/btree/extern.h
@@ -0,0 +1,70 @@
+/*-
+ * Copyright (c) 1991, 1993
+ * 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 8.3 (Berkeley) 2/21/94
+ */
+
+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 *, PAGE *, int));
+int __bt_fd __P((const DB *));
+EPG *__bt_first __P((BTREE *, const DBT *, int *));
+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 *));
+EPG *__bt_search __P((BTREE *, const DBT *, int *));
+int __bt_seq __P((const DB *, DBT *, DBT *, u_int));
+int __bt_split __P((BTREE *, PAGE *,
+ const DBT *, const DBT *, int, size_t, indx_t));
+int __bt_sync __P((const DB *, u_int));
+
+int __ovfl_delete __P((BTREE *, void *));
+int __ovfl_get __P((BTREE *, void *, size_t *, char **, 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
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