Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1171 insertions, 0 deletions

diff --git a/security/nss/lib/dbm/src/hash.c b/security/nss/lib/dbm/src/hash.c
new file mode 100644
index 0000000000..2c2ce9d873
--- /dev/null
+++ b/security/nss/lib/dbm/src/hash.c
@@ -0,0 +1,1171 @@
+/*-
+ * Copyright (c) 1990, 1993, 1994
+ *  The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Margo Seltzer.
+ *
+ * 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. ***REMOVED*** - see
+ *    ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
+ * 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[] = "@(#)hash.c  8.9 (Berkeley) 6/16/94";
+#endif /* LIBC_SCCS and not lint */
+
+#if !defined(_WIN32) && !defined(_WINDOWS) && !defined(macintosh)
+#include <sys/param.h>
+#endif
+
+#if !defined(macintosh)
+#ifdef XP_OS2
+#include <sys/types.h>
+#endif
+#include <sys/stat.h>
+#endif
+
+#if defined(macintosh)
+#include <unix.h>
+#include <unistd.h>
+#endif
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if !defined(_WIN32) && !defined(_WINDOWS) && !defined(macintosh)
+#include <unistd.h>
+#endif
+#if defined(_WIN32) || defined(_WINDOWS)
+#include <windows.h>
+#endif
+
+#include <assert.h>
+
+#include "mcom_db.h"
+#include "hash.h"
+#include "page.h"
+
+/*
+#include "extern.h"
+*/
+static int alloc_segs(HTAB *, int);
+static int flush_meta(HTAB *);
+static int hash_access(HTAB *, ACTION, DBT *, DBT *);
+static int hash_close(DB *);
+static int hash_delete(const DB *, const DBT *, uint);
+static int hash_fd(const DB *);
+static int hash_get(const DB *, const DBT *, DBT *, uint);
+static int hash_put(const DB *, DBT *, const DBT *, uint);
+static void *hash_realloc(SEGMENT **, size_t, size_t);
+static int hash_seq(const DB *, DBT *, DBT *, uint);
+static int hash_sync(const DB *, uint);
+static int hdestroy(HTAB *);
+static HTAB *init_hash(HTAB *, const char *, HASHINFO *);
+static int init_htab(HTAB *, int);
+#if BYTE_ORDER == LITTLE_ENDIAN
+static void swap_header(HTAB *);
+static void swap_header_copy(HASHHDR *, HASHHDR *);
+#endif
+
+/* Fast arithmetic, relying on powers of 2, */
+#define MOD(x, y) ((x) & ((y)-1))
+
+#define RETURN_ERROR(ERR, LOC) \
+    {                          \
+        save_errno = ERR;      \
+        goto LOC;              \
+    }
+
+/* Return values */
+#define SUCCESS (0)
+#define DBM_ERROR (-1)
+#define ABNORMAL (1)
+
+#ifdef HASH_STATISTICS
+int hash_accesses, hash_collisions, hash_expansions, hash_overflows;
+#endif
+
+/* A new Lou (montulli@mozilla.com) routine.
+ *
+ * The database is screwed.
+ *
+ * This closes the file, flushing buffers as appropriate.
+ */
+static void
+dbm_remove_database(DB *dbp)
+{
+    HTAB *hashp = (HTAB *)dbp->internal;
+
+    assert(0);
+
+    if (!hashp)
+        return;
+    hdestroy(hashp);
+    dbp->internal = NULL;
+}
+
+/************************** INTERFACE ROUTINES ***************************/
+/* OPEN/CLOSE */
+
+extern DB *
+dbm_hash_open(const char *file, int flags, int mode, const HASHINFO *info, int dflags)
+{
+    HTAB *hashp = NULL;
+    struct stat statbuf;
+    DB *dbp;
+    int bpages, hdrsize, new_table, nsegs, save_errno;
+
+    if ((flags & O_ACCMODE) == O_WRONLY) {
+        errno = EINVAL;
+        return NULL;
+    }
+
+    /* zero the statbuffer so that
+     * we can check it for a non-zero
+     * date to see if stat succeeded
+     */
+    memset(&statbuf, 0, sizeof(struct stat));
+
+    if (!(hashp = (HTAB *)calloc(1, sizeof(HTAB)))) {
+        errno = ENOMEM;
+        return NULL;
+    }
+    hashp->fp = NO_FILE;
+    if (file)
+        hashp->filename = strdup(file);
+
+    /*
+     * Even if user wants write only, we need to be able to read
+     * the actual file, so we need to open it read/write. But, the
+     * field in the hashp structure needs to be accurate so that
+     * we can check accesses.
+     */
+    hashp->flags = flags;
+
+    new_table = 0;
+    if (!file || (flags & O_TRUNC) || (stat(file, &statbuf) && (errno == ENOENT))) {
+        if (errno == ENOENT)
+            errno = 0; /* Just in case someone looks at errno */
+        new_table = 1;
+    } else if (statbuf.st_mtime && statbuf.st_size == 0) {
+        /* check for a zero length file and delete it
+         * if it exists
+         */
+        new_table = 1;
+    }
+    hashp->file_size = statbuf.st_size;
+
+    if (file) {
+#if defined(_WIN32) || defined(_WINDOWS) || defined(macintosh) || defined(XP_OS2)
+        if ((hashp->fp = DBFILE_OPEN(file, flags | O_BINARY, mode)) == -1)
+            RETURN_ERROR(errno, error1);
+#else
+        if ((hashp->fp = open(file, flags, mode)) == -1)
+            RETURN_ERROR(errno, error1);
+        (void)fcntl(hashp->fp, F_SETFD, 1);
+#endif
+    }
+    if (new_table) {
+        if (!init_hash(hashp, file, (HASHINFO *)info))
+            RETURN_ERROR(errno, error1);
+    } else {
+        /* Table already exists */
+        if (info && info->hash)
+            hashp->hash = info->hash;
+        else
+            hashp->hash = dbm_default_hash;
+
+        hdrsize = read(hashp->fp, (char *)&hashp->hdr, sizeof(HASHHDR));
+        if (hdrsize == -1)
+            RETURN_ERROR(errno, error1);
+        if (hdrsize != sizeof(HASHHDR))
+            RETURN_ERROR(EFTYPE, error1);
+#if BYTE_ORDER == LITTLE_ENDIAN
+        swap_header(hashp);
+#endif
+        /* Verify file type, versions and hash function */
+        if (hashp->MAGIC != HASHMAGIC)
+            RETURN_ERROR(EFTYPE, error1);
+#define OLDHASHVERSION 1
+        if (hashp->VERSION != HASHVERSION &&
+            hashp->VERSION != OLDHASHVERSION)
+            RETURN_ERROR(EFTYPE, error1);
+        if (hashp->hash(CHARKEY, sizeof(CHARKEY)) != hashp->H_CHARKEY)
+            RETURN_ERROR(EFTYPE, error1);
+        if (hashp->NKEYS < 0) /* Old bad database. */
+            RETURN_ERROR(EFTYPE, error1);
+
+        /*
+         * Figure out how many segments we need.  Max_Bucket is the
+         * maximum bucket number, so the number of buckets is
+         * max_bucket + 1.
+         */
+        nsegs = (hashp->MAX_BUCKET + 1 + hashp->SGSIZE - 1) /
+                hashp->SGSIZE;
+        hashp->nsegs = 0;
+        if (alloc_segs(hashp, nsegs))
+            /* If alloc_segs fails, errno will have been set.  */
+            RETURN_ERROR(errno, error1);
+        /* Read in bitmaps */
+        bpages = (hashp->SPARES[hashp->OVFL_POINT] +
+                  (hashp->BSIZE << BYTE_SHIFT) - 1) >>
+                 (hashp->BSHIFT + BYTE_SHIFT);
+
+        hashp->nmaps = bpages;
+        (void)memset(&hashp->mapp[0], 0, bpages * sizeof(uint32 *));
+    }
+
+    /* Initialize Buffer Manager */
+    if (info && info->cachesize)
+        dbm_buf_init(hashp, (int32)info->cachesize);
+    else
+        dbm_buf_init(hashp, DEF_BUFSIZE);
+
+    hashp->new_file = new_table;
+#ifdef macintosh
+    hashp->save_file = file && !(hashp->flags & O_RDONLY);
+#else
+    hashp->save_file = file && (hashp->flags & O_RDWR);
+#endif
+    hashp->cbucket = -1;
+    if (!(dbp = (DB *)malloc(sizeof(DB)))) {
+        RETURN_ERROR(ENOMEM, error1);
+    }
+    dbp->internal = hashp;
+    dbp->close = hash_close;
+    dbp->del = hash_delete;
+    dbp->fd = hash_fd;
+    dbp->get = hash_get;
+    dbp->put = hash_put;
+    dbp->seq = hash_seq;
+    dbp->sync = hash_sync;
+    dbp->type = DB_HASH;
+
+#ifdef HASH_STATISTICS
+    hash_overflows = hash_accesses = hash_collisions = hash_expansions = 0;
+#endif
+    return (dbp);
+
+error1:
+    hdestroy(hashp);
+    errno = save_errno;
+    return (NULL);
+}
+
+static int
+hash_close(DB *dbp)
+{
+    HTAB *hashp;
+    int retval;
+
+    if (!dbp)
+        return (DBM_ERROR);
+
+    hashp = (HTAB *)dbp->internal;
+    if (!hashp)
+        return (DBM_ERROR);
+
+    retval = hdestroy(hashp);
+    free(dbp);
+    return (retval);
+}
+
+static int
+hash_fd(const DB *dbp)
+{
+    HTAB *hashp;
+
+    if (!dbp)
+        return (DBM_ERROR);
+
+    hashp = (HTAB *)dbp->internal;
+    if (!hashp)
+        return (DBM_ERROR);
+
+    if (hashp->fp == -1) {
+        errno = ENOENT;
+        return (-1);
+    }
+    return (hashp->fp);
+}
+
+/************************** LOCAL CREATION ROUTINES **********************/
+static HTAB *
+init_hash(HTAB *hashp, const char *file, HASHINFO *info)
+{
+    struct stat statbuf;
+    int nelem;
+
+    nelem = 1;
+    hashp->NKEYS = 0;
+    hashp->LORDER = BYTE_ORDER;
+    hashp->BSIZE = DEF_BUCKET_SIZE;
+    hashp->BSHIFT = DEF_BUCKET_SHIFT;
+    hashp->SGSIZE = DEF_SEGSIZE;
+    hashp->SSHIFT = DEF_SEGSIZE_SHIFT;
+    hashp->DSIZE = DEF_DIRSIZE;
+    hashp->FFACTOR = DEF_FFACTOR;
+    hashp->hash = dbm_default_hash;
+    memset(hashp->SPARES, 0, sizeof(hashp->SPARES));
+    memset(hashp->BITMAPS, 0, sizeof(hashp->BITMAPS));
+
+    /* Fix bucket size to be optimal for file system */
+    if (file != NULL) {
+        if (stat(file, &statbuf))
+            return (NULL);
+
+#if !defined(_WIN32) && !defined(_WINDOWS) && !defined(macintosh) && !defined(XP_OS2)
+#if defined(__QNX__) && !defined(__QNXNTO__)
+        hashp->BSIZE = 512; /* preferred blk size on qnx4 */
+#else
+        hashp->BSIZE = statbuf.st_blksize;
+#endif
+
+        /* new code added by Lou to reduce block
+         * size down below MAX_BSIZE
+         */
+        if (hashp->BSIZE > MAX_BSIZE)
+            hashp->BSIZE = MAX_BSIZE;
+#endif
+        hashp->BSHIFT = dbm_log2((uint32)hashp->BSIZE);
+    }
+
+    if (info) {
+        if (info->bsize) {
+            /* Round pagesize up to power of 2 */
+            hashp->BSHIFT = dbm_log2(info->bsize);
+            hashp->BSIZE = 1 << hashp->BSHIFT;
+            if (hashp->BSIZE > MAX_BSIZE) {
+                errno = EINVAL;
+                return (NULL);
+            }
+        }
+        if (info->ffactor)
+            hashp->FFACTOR = info->ffactor;
+        if (info->hash)
+            hashp->hash = info->hash;
+        if (info->nelem)
+            nelem = info->nelem;
+        if (info->lorder) {
+            if (info->lorder != BIG_ENDIAN &&
+                info->lorder != LITTLE_ENDIAN) {
+                errno = EINVAL;
+                return (NULL);
+            }
+            hashp->LORDER = info->lorder;
+        }
+    }
+    /* init_htab sets errno if it fails */
+    if (init_htab(hashp, nelem))
+        return (NULL);
+    else
+        return (hashp);
+}
+/*
+ * This calls alloc_segs which may run out of memory.  Alloc_segs will
+ * set errno, so we just pass the error information along.
+ *
+ * Returns 0 on No Error
+ */
+static int
+init_htab(HTAB *hashp, int nelem)
+{
+    register int nbuckets, nsegs;
+    int l2;
+
+    /*
+     * Divide number of elements by the fill factor and determine a
+     * desired number of buckets.  Allocate space for the next greater
+     * power of two number of buckets.
+     */
+    nelem = (nelem - 1) / hashp->FFACTOR + 1;
+
+    l2 = dbm_log2((uint32)PR_MAX(nelem, 2));
+    nbuckets = 1 << l2;
+
+    hashp->SPARES[l2] = l2 + 1;
+    hashp->SPARES[l2 + 1] = l2 + 1;
+    hashp->OVFL_POINT = l2;
+    hashp->LAST_FREED = 2;
+
+    /* First bitmap page is at: splitpoint l2 page offset 1 */
+    if (dbm_ibitmap(hashp, (int)OADDR_OF(l2, 1), l2 + 1, 0))
+        return (-1);
+
+    hashp->MAX_BUCKET = hashp->LOW_MASK = nbuckets - 1;
+    hashp->HIGH_MASK = (nbuckets << 1) - 1;
+    hashp->HDRPAGES = ((PR_MAX(sizeof(HASHHDR), MINHDRSIZE) - 1) >>
+                       hashp->BSHIFT) +
+                      1;
+
+    nsegs = (nbuckets - 1) / hashp->SGSIZE + 1;
+    nsegs = 1 << dbm_log2((uint32)nsegs);
+
+    if (nsegs > hashp->DSIZE)
+        hashp->DSIZE = nsegs;
+    return (alloc_segs(hashp, nsegs));
+}
+
+/********************** DESTROY/CLOSE ROUTINES ************************/
+
+/*
+ * Flushes any changes to the file if necessary and destroys the hashp
+ * structure, freeing all allocated space.
+ */
+static int
+hdestroy(HTAB *hashp)
+{
+    int i, save_errno;
+
+    save_errno = 0;
+
+#ifdef HASH_STATISTICS
+    (void)fprintf(stderr, "hdestroy: accesses %ld collisions %ld\n",
+                  hash_accesses, hash_collisions);
+    (void)fprintf(stderr, "hdestroy: expansions %ld\n",
+                  hash_expansions);
+    (void)fprintf(stderr, "hdestroy: overflows %ld\n",
+                  hash_overflows);
+    (void)fprintf(stderr, "keys %ld maxp %d segmentcount %d\n",
+                  hashp->NKEYS, hashp->MAX_BUCKET, hashp->nsegs);
+
+    for (i = 0; i < NCACHED; i++)
+        (void)fprintf(stderr,
+                      "spares[%d] = %d\n", i, hashp->SPARES[i]);
+#endif
+    /*
+     * Call on buffer manager to free buffers, and if required,
+     * write them to disk.
+     */
+    if (dbm_buf_free(hashp, 1, hashp->save_file))
+        save_errno = errno;
+    if (hashp->dir) {
+        free(*hashp->dir); /* Free initial segments */
+        /* Free extra segments */
+        while (hashp->exsegs--)
+            free(hashp->dir[--hashp->nsegs]);
+        free(hashp->dir);
+    }
+    if (flush_meta(hashp) && !save_errno)
+        save_errno = errno;
+    /* Free Bigmaps */
+    for (i = 0; i < hashp->nmaps; i++)
+        if (hashp->mapp[i])
+            free(hashp->mapp[i]);
+
+    if (hashp->fp != -1)
+        (void)close(hashp->fp);
+
+    if (hashp->filename) {
+#if defined(_WIN32) || defined(_WINDOWS) || defined(XP_OS2)
+        if (hashp->is_temp)
+            (void)unlink(hashp->filename);
+#endif
+        free(hashp->filename);
+    }
+    if (hashp->tmp_buf)
+        free(hashp->tmp_buf);
+    if (hashp->tmp_key)
+        free(hashp->tmp_key);
+    free(hashp);
+    if (save_errno) {
+        errno = save_errno;
+        return (DBM_ERROR);
+    }
+    return (SUCCESS);
+}
+
+#if defined(_WIN32) || defined(_WINDOWS)
+/*
+ * Close and reopen file to force file length update on windows.
+ *
+ * Returns:
+ *   0 == OK
+ *  -1 DBM_ERROR
+ */
+static int
+update_EOF(HTAB *hashp)
+{
+#if defined(DBM_REOPEN_ON_FLUSH)
+    char *file = hashp->filename;
+    off_t file_size;
+    int flags;
+    int mode = -1;
+    struct stat statbuf;
+
+    memset(&statbuf, 0, sizeof statbuf);
+
+    /* make sure we won't lose the file by closing it. */
+    if (!file || (stat(file, &statbuf) && (errno == ENOENT))) {
+        /* pretend we did it. */
+        return 0;
+    }
+
+    (void)close(hashp->fp);
+
+    flags = hashp->flags & ~(O_TRUNC | O_CREAT | O_EXCL);
+
+    if ((hashp->fp = DBFILE_OPEN(file, flags | O_BINARY, mode)) == -1)
+        return -1;
+    file_size = lseek(hashp->fp, (off_t)0, SEEK_END);
+    if (file_size == -1)
+        return -1;
+    hashp->file_size = file_size;
+    return 0;
+#else
+    int fd = hashp->fp;
+    off_t file_size = lseek(fd, (off_t)0, SEEK_END);
+    HANDLE handle = (HANDLE)_get_osfhandle(fd);
+    BOOL cool = FlushFileBuffers(handle);
+#ifdef DEBUG3
+    if (!cool) {
+        DWORD err = GetLastError();
+        (void)fprintf(stderr,
+                      "FlushFileBuffers failed, last error = %d, 0x%08x\n",
+                      err, err);
+    }
+#endif
+    if (file_size == -1)
+        return -1;
+    hashp->file_size = file_size;
+    return cool ? 0 : -1;
+#endif
+}
+#endif
+
+/*
+ * Write modified pages to disk
+ *
+ * Returns:
+ *   0 == OK
+ *  -1 DBM_ERROR
+ */
+static int
+hash_sync(const DB *dbp, uint flags)
+{
+    HTAB *hashp;
+
+    if (flags != 0) {
+        errno = EINVAL;
+        return (DBM_ERROR);
+    }
+
+    if (!dbp)
+        return (DBM_ERROR);
+
+    hashp = (HTAB *)dbp->internal;
+    if (!hashp)
+        return (DBM_ERROR);
+
+    if (!hashp->save_file)
+        return (0);
+    if (dbm_buf_free(hashp, 0, 1) || flush_meta(hashp))
+        return (DBM_ERROR);
+#if defined(_WIN32) || defined(_WINDOWS)
+    if (hashp->updateEOF && hashp->filename && !hashp->is_temp) {
+        int status = update_EOF(hashp);
+        hashp->updateEOF = 0;
+        if (status)
+            return status;
+    }
+#endif
+    hashp->new_file = 0;
+    return (0);
+}
+
+/*
+ * Returns:
+ *   0 == OK
+ *  -1 indicates that errno should be set
+ */
+static int
+flush_meta(HTAB *hashp)
+{
+    HASHHDR *whdrp;
+#if BYTE_ORDER == LITTLE_ENDIAN
+    HASHHDR whdr;
+#endif
+    int fp, i, wsize;
+
+    if (!hashp->save_file)
+        return (0);
+    hashp->MAGIC = HASHMAGIC;
+    hashp->VERSION = HASHVERSION;
+    hashp->H_CHARKEY = hashp->hash(CHARKEY, sizeof(CHARKEY));
+
+    fp = hashp->fp;
+    whdrp = &hashp->hdr;
+#if BYTE_ORDER == LITTLE_ENDIAN
+    whdrp = &whdr;
+    swap_header_copy(&hashp->hdr, whdrp);
+#endif
+    if ((lseek(fp, (off_t)0, SEEK_SET) == -1) ||
+        ((wsize = write(fp, (char *)whdrp, sizeof(HASHHDR))) == -1))
+        return (-1);
+    else if (wsize != sizeof(HASHHDR)) {
+        errno = EFTYPE;
+        hashp->dbmerrno = errno;
+        return (-1);
+    }
+    for (i = 0; i < NCACHED; i++)
+        if (hashp->mapp[i])
+            if (dbm_put_page(hashp, (char *)hashp->mapp[i],
+                             hashp->BITMAPS[i], 0, 1))
+                return (-1);
+    return (0);
+}
+
+/*******************************SEARCH ROUTINES *****************************/
+/*
+ * All the access routines return
+ *
+ * Returns:
+ *   0 on SUCCESS
+ *   1 to indicate an external DBM_ERROR (i.e. key not found, etc)
+ *  -1 to indicate an internal DBM_ERROR (i.e. out of memory, etc)
+ */
+static int
+hash_get(
+    const DB *dbp,
+    const DBT *key,
+    DBT *data,
+    uint flag)
+{
+    HTAB *hashp;
+    int rv;
+
+    hashp = (HTAB *)dbp->internal;
+    if (!hashp)
+        return (DBM_ERROR);
+
+    if (flag) {
+        hashp->dbmerrno = errno = EINVAL;
+        return (DBM_ERROR);
+    }
+
+    rv = hash_access(hashp, HASH_GET, (DBT *)key, data);
+
+    if (rv == DATABASE_CORRUPTED_ERROR) {
+#if defined(unix) && defined(DEBUG)
+        printf("\n\nDBM Database has been corrupted, tell Lou...\n\n");
+#endif
+        dbm_remove_database((DB *)dbp);
+    }
+
+    return (rv);
+}
+
+static int
+hash_put(
+    const DB *dbp,
+    DBT *key,
+    const DBT *data,
+    uint flag)
+{
+    HTAB *hashp;
+    int rv;
+
+    hashp = (HTAB *)dbp->internal;
+    if (!hashp)
+        return (DBM_ERROR);
+
+    if (flag && flag != R_NOOVERWRITE) {
+        hashp->dbmerrno = errno = EINVAL;
+        return (DBM_ERROR);
+    }
+    if ((hashp->flags & O_ACCMODE) == O_RDONLY) {
+        hashp->dbmerrno = errno = EPERM;
+        return (DBM_ERROR);
+    }
+
+    rv = hash_access(hashp, flag == R_NOOVERWRITE ? HASH_PUTNEW : HASH_PUT,
+                     (DBT *)key, (DBT *)data);
+
+    if (rv == DATABASE_CORRUPTED_ERROR) {
+#if defined(unix) && defined(DEBUG)
+        printf("\n\nDBM Database has been corrupted, tell Lou...\n\n");
+#endif
+        dbm_remove_database((DB *)dbp);
+    }
+
+    return (rv);
+}
+
+static int
+hash_delete(
+    const DB *dbp,
+    const DBT *key,
+    uint flag) /* Ignored */
+{
+    HTAB *hashp;
+    int rv;
+
+    hashp = (HTAB *)dbp->internal;
+    if (!hashp)
+        return (DBM_ERROR);
+
+    if (flag && flag != R_CURSOR) {
+        hashp->dbmerrno = errno = EINVAL;
+        return (DBM_ERROR);
+    }
+    if ((hashp->flags & O_ACCMODE) == O_RDONLY) {
+        hashp->dbmerrno = errno = EPERM;
+        return (DBM_ERROR);
+    }
+    rv = hash_access(hashp, HASH_DELETE, (DBT *)key, NULL);
+
+    if (rv == DATABASE_CORRUPTED_ERROR) {
+#if defined(unix) && defined(DEBUG)
+        printf("\n\nDBM Database has been corrupted, tell Lou...\n\n");
+#endif
+        dbm_remove_database((DB *)dbp);
+    }
+
+    return (rv);
+}
+
+#define MAX_OVERFLOW_HASH_ACCESS_LOOPS 2000
+/*
+ * Assume that hashp has been set in wrapper routine.
+ */
+static int
+hash_access(
+    HTAB *hashp,
+    ACTION action,
+    DBT *key, DBT *val)
+{
+    register BUFHEAD *rbufp;
+    BUFHEAD *bufp, *save_bufp;
+    register uint16 *bp;
+    register long n, ndx, off;
+    register size_t size;
+    register char *kp;
+    uint16 pageno;
+    uint32 ovfl_loop_count = 0;
+    int32 last_overflow_page_no = -1;
+
+#ifdef HASH_STATISTICS
+    hash_accesses++;
+#endif
+
+    off = hashp->BSIZE;
+    size = key->size;
+    kp = (char *)key->data;
+    rbufp = dbm_get_buf(hashp, dbm_call_hash(hashp, kp, size), NULL, 0);
+    if (!rbufp)
+        return (DATABASE_CORRUPTED_ERROR);
+    save_bufp = rbufp;
+
+    /* Pin the bucket chain */
+    rbufp->flags |= BUF_PIN;
+    for (bp = (uint16 *)rbufp->page, n = *bp++, ndx = 1; ndx < n;) {
+
+        if (bp[1] >= REAL_KEY) {
+            /* Real key/data pair */
+            if (size == (unsigned long)(off - *bp) &&
+                memcmp(kp, rbufp->page + *bp, size) == 0)
+                goto found;
+            off = bp[1];
+#ifdef HASH_STATISTICS
+            hash_collisions++;
+#endif
+            bp += 2;
+            ndx += 2;
+        } else if (bp[1] == OVFLPAGE) {
+
+            /* database corruption: overflow loop detection */
+            if (last_overflow_page_no == (int32)*bp)
+                return (DATABASE_CORRUPTED_ERROR);
+
+            last_overflow_page_no = *bp;
+
+            rbufp = dbm_get_buf(hashp, *bp, rbufp, 0);
+            if (!rbufp) {
+                save_bufp->flags &= ~BUF_PIN;
+                return (DBM_ERROR);
+            }
+
+            ovfl_loop_count++;
+            if (ovfl_loop_count > MAX_OVERFLOW_HASH_ACCESS_LOOPS)
+                return (DATABASE_CORRUPTED_ERROR);
+
+            /* FOR LOOP INIT */
+            bp = (uint16 *)rbufp->page;
+            n = *bp++;
+            ndx = 1;
+            off = hashp->BSIZE;
+        } else if (bp[1] < REAL_KEY) {
+            if ((ndx =
+                     dbm_find_bigpair(hashp, rbufp, ndx, kp, (int)size)) > 0)
+                goto found;
+            if (ndx == -2) {
+                bufp = rbufp;
+                if (!(pageno =
+                          dbm_find_last_page(hashp, &bufp))) {
+                    ndx = 0;
+                    rbufp = bufp;
+                    break; /* FOR */
+                }
+                rbufp = dbm_get_buf(hashp, pageno, bufp, 0);
+                if (!rbufp) {
+                    save_bufp->flags &= ~BUF_PIN;
+                    return (DBM_ERROR);
+                }
+                /* FOR LOOP INIT */
+                bp = (uint16 *)rbufp->page;
+                n = *bp++;
+                ndx = 1;
+                off = hashp->BSIZE;
+            } else {
+                save_bufp->flags &= ~BUF_PIN;
+                return (DBM_ERROR);
+            }
+        }
+    }
+
+    /* Not found */
+    switch (action) {
+        case HASH_PUT:
+        case HASH_PUTNEW:
+            if (dbm_addel(hashp, rbufp, key, val)) {
+                save_bufp->flags &= ~BUF_PIN;
+                return (DBM_ERROR);
+            } else {
+                save_bufp->flags &= ~BUF_PIN;
+                return (SUCCESS);
+            }
+        case HASH_GET:
+        case HASH_DELETE:
+        default:
+            save_bufp->flags &= ~BUF_PIN;
+            return (ABNORMAL);
+    }
+
+found:
+    switch (action) {
+        case HASH_PUTNEW:
+            save_bufp->flags &= ~BUF_PIN;
+            return (ABNORMAL);
+        case HASH_GET:
+            bp = (uint16 *)rbufp->page;
+            if (bp[ndx + 1] < REAL_KEY) {
+                if (dbm_big_return(hashp, rbufp, ndx, val, 0))
+                    return (DBM_ERROR);
+            } else {
+                val->data = (uint8 *)rbufp->page + (int)bp[ndx + 1];
+                val->size = bp[ndx] - bp[ndx + 1];
+            }
+            break;
+        case HASH_PUT:
+            if ((dbm_delpair(hashp, rbufp, ndx)) ||
+                (dbm_addel(hashp, rbufp, key, val))) {
+                save_bufp->flags &= ~BUF_PIN;
+                return (DBM_ERROR);
+            }
+            break;
+        case HASH_DELETE:
+            if (dbm_delpair(hashp, rbufp, ndx))
+                return (DBM_ERROR);
+            break;
+        default:
+            abort();
+    }
+    save_bufp->flags &= ~BUF_PIN;
+    return (SUCCESS);
+}
+
+static int
+hash_seq(
+    const DB *dbp,
+    DBT *key, DBT *data,
+    uint flag)
+{
+    register uint32 bucket;
+    register BUFHEAD *bufp = NULL;
+    HTAB *hashp;
+    uint16 *bp, ndx;
+
+    hashp = (HTAB *)dbp->internal;
+    if (!hashp)
+        return (DBM_ERROR);
+
+    if (flag && flag != R_FIRST && flag != R_NEXT) {
+        hashp->dbmerrno = errno = EINVAL;
+        return (DBM_ERROR);
+    }
+#ifdef HASH_STATISTICS
+    hash_accesses++;
+#endif
+    if ((hashp->cbucket < 0) || (flag == R_FIRST)) {
+        hashp->cbucket = 0;
+        hashp->cndx = 1;
+        hashp->cpage = NULL;
+    }
+
+    for (bp = NULL; !bp || !bp[0];) {
+        if (!(bufp = hashp->cpage)) {
+            for (bucket = hashp->cbucket;
+                 bucket <= (uint32)hashp->MAX_BUCKET;
+                 bucket++, hashp->cndx = 1) {
+                bufp = dbm_get_buf(hashp, bucket, NULL, 0);
+                if (!bufp)
+                    return (DBM_ERROR);
+                hashp->cpage = bufp;
+                bp = (uint16 *)bufp->page;
+                if (bp[0])
+                    break;
+            }
+            hashp->cbucket = bucket;
+            if (hashp->cbucket > hashp->MAX_BUCKET) {
+                hashp->cbucket = -1;
+                return (ABNORMAL);
+            }
+        } else
+            bp = (uint16 *)hashp->cpage->page;
+
+#ifdef DEBUG
+        assert(bp);
+        assert(bufp);
+#endif
+        while (bp[hashp->cndx + 1] == OVFLPAGE) {
+            bufp = hashp->cpage =
+                dbm_get_buf(hashp, bp[hashp->cndx], bufp, 0);
+            if (!bufp)
+                return (DBM_ERROR);
+            bp = (uint16 *)(bufp->page);
+            hashp->cndx = 1;
+        }
+        if (!bp[0]) {
+            hashp->cpage = NULL;
+            ++hashp->cbucket;
+        }
+    }
+    ndx = hashp->cndx;
+    if (bp[ndx + 1] < REAL_KEY) {
+        if (dbm_big_keydata(hashp, bufp, key, data, 1))
+            return (DBM_ERROR);
+    } else {
+        key->data = (uint8 *)hashp->cpage->page + bp[ndx];
+        key->size = (ndx > 1 ? bp[ndx - 1] : hashp->BSIZE) - bp[ndx];
+        data->data = (uint8 *)hashp->cpage->page + bp[ndx + 1];
+        data->size = bp[ndx] - bp[ndx + 1];
+        ndx += 2;
+        if (ndx > bp[0]) {
+            hashp->cpage = NULL;
+            hashp->cbucket++;
+            hashp->cndx = 1;
+        } else
+            hashp->cndx = ndx;
+    }
+    return (SUCCESS);
+}
+
+/********************************* UTILITIES ************************/
+
+/*
+ * Returns:
+ *   0 ==> OK
+ *  -1 ==> Error
+ */
+extern int
+dbm_expand_table(HTAB *hashp)
+{
+    uint32 old_bucket, new_bucket;
+    int new_segnum, spare_ndx;
+    size_t dirsize;
+
+#ifdef HASH_STATISTICS
+    hash_expansions++;
+#endif
+    new_bucket = ++hashp->MAX_BUCKET;
+    old_bucket = (hashp->MAX_BUCKET & hashp->LOW_MASK);
+
+    new_segnum = new_bucket >> hashp->SSHIFT;
+
+    /* Check if we need a new segment */
+    if (new_segnum >= hashp->nsegs) {
+        /* Check if we need to expand directory */
+        if (new_segnum >= hashp->DSIZE) {
+            /* Reallocate directory */
+            dirsize = hashp->DSIZE * sizeof(SEGMENT *);
+            if (!hash_realloc(&hashp->dir, dirsize, dirsize << 1))
+                return (-1);
+            hashp->DSIZE = dirsize << 1;
+        }
+        if ((hashp->dir[new_segnum] =
+                 (SEGMENT)calloc((size_t)hashp->SGSIZE, sizeof(BUFHEAD *))) == NULL)
+            return (-1);
+        hashp->exsegs++;
+        hashp->nsegs++;
+    }
+    /*
+     * If the split point is increasing (MAX_BUCKET's log base 2
+     * * increases), we need to copy the current contents of the spare
+     * split bucket to the next bucket.
+     */
+    spare_ndx = dbm_log2((uint32)(hashp->MAX_BUCKET + 1));
+    if (spare_ndx > hashp->OVFL_POINT) {
+        hashp->SPARES[spare_ndx] = hashp->SPARES[hashp->OVFL_POINT];
+        hashp->OVFL_POINT = spare_ndx;
+    }
+
+    if (new_bucket > (uint32)hashp->HIGH_MASK) {
+        /* Starting a new doubling */
+        hashp->LOW_MASK = hashp->HIGH_MASK;
+        hashp->HIGH_MASK = new_bucket | hashp->LOW_MASK;
+    }
+    /* Relocate records to the new bucket */
+    return (dbm_split_page(hashp, old_bucket, new_bucket));
+}
+
+/*
+ * If realloc guarantees that the pointer is not destroyed if the realloc
+ * fails, then this routine can go away.
+ */
+static void *
+hash_realloc(
+    SEGMENT **p_ptr,
+    size_t oldsize, size_t newsize)
+{
+    register void *p;
+
+    if ((p = malloc(newsize))) {
+        memmove(p, *p_ptr, oldsize);
+        memset((char *)p + oldsize, 0, newsize - oldsize);
+        free(*p_ptr);
+        *p_ptr = (SEGMENT *)p;
+    }
+    return (p);
+}
+
+extern uint32
+dbm_call_hash(HTAB *hashp, char *k, size_t len)
+{
+    uint32 n, bucket;
+
+    n = hashp->hash(k, len);
+    bucket = n & hashp->HIGH_MASK;
+    if (bucket > (uint32)hashp->MAX_BUCKET)
+        bucket = bucket & hashp->LOW_MASK;
+    return (bucket);
+}
+
+/*
+ * Allocate segment table.  On error, set errno.
+ *
+ * Returns 0 on success
+ */
+static int
+alloc_segs(
+    HTAB *hashp,
+    int nsegs)
+{
+    register int i;
+    register SEGMENT store;
+
+    if ((hashp->dir =
+             (SEGMENT *)calloc((size_t)hashp->DSIZE, sizeof(SEGMENT))) == NULL) {
+        errno = ENOMEM;
+        return (-1);
+    }
+    /* Allocate segments */
+    if ((store =
+             (SEGMENT)calloc((size_t)nsegs << hashp->SSHIFT, sizeof(BUFHEAD *))) == NULL) {
+        errno = ENOMEM;
+        return (-1);
+    }
+    for (i = 0; i < nsegs; i++, hashp->nsegs++)
+        hashp->dir[i] = &store[i << hashp->SSHIFT];
+    return (0);
+}
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+/*
+ * Hashp->hdr needs to be byteswapped.
+ */
+static void
+swap_header_copy(
+    HASHHDR *srcp, HASHHDR *destp)
+{
+    int i;
+
+    P_32_COPY(srcp->magic, destp->magic);
+    P_32_COPY(srcp->version, destp->version);
+    P_32_COPY(srcp->lorder, destp->lorder);
+    P_32_COPY(srcp->bsize, destp->bsize);
+    P_32_COPY(srcp->bshift, destp->bshift);
+    P_32_COPY(srcp->dsize, destp->dsize);
+    P_32_COPY(srcp->ssize, destp->ssize);
+    P_32_COPY(srcp->sshift, destp->sshift);
+    P_32_COPY(srcp->ovfl_point, destp->ovfl_point);
+    P_32_COPY(srcp->last_freed, destp->last_freed);
+    P_32_COPY(srcp->max_bucket, destp->max_bucket);
+    P_32_COPY(srcp->high_mask, destp->high_mask);
+    P_32_COPY(srcp->low_mask, destp->low_mask);
+    P_32_COPY(srcp->ffactor, destp->ffactor);
+    P_32_COPY(srcp->nkeys, destp->nkeys);
+    P_32_COPY(srcp->hdrpages, destp->hdrpages);
+    P_32_COPY(srcp->h_charkey, destp->h_charkey);
+    for (i = 0; i < NCACHED; i++) {
+        P_32_COPY(srcp->spares[i], destp->spares[i]);
+        P_16_COPY(srcp->bitmaps[i], destp->bitmaps[i]);
+    }
+}
+
+static void
+swap_header(HTAB *hashp)
+{
+    HASHHDR *hdrp;
+    int i;
+
+    hdrp = &hashp->hdr;
+
+    M_32_SWAP(hdrp->magic);
+    M_32_SWAP(hdrp->version);
+    M_32_SWAP(hdrp->lorder);
+    M_32_SWAP(hdrp->bsize);
+    M_32_SWAP(hdrp->bshift);
+    M_32_SWAP(hdrp->dsize);
+    M_32_SWAP(hdrp->ssize);
+    M_32_SWAP(hdrp->sshift);
+    M_32_SWAP(hdrp->ovfl_point);
+    M_32_SWAP(hdrp->last_freed);
+    M_32_SWAP(hdrp->max_bucket);
+    M_32_SWAP(hdrp->high_mask);
+    M_32_SWAP(hdrp->low_mask);
+    M_32_SWAP(hdrp->ffactor);
+    M_32_SWAP(hdrp->nkeys);
+    M_32_SWAP(hdrp->hdrpages);
+    M_32_SWAP(hdrp->h_charkey);
+    for (i = 0; i < NCACHED; i++) {
+        M_32_SWAP(hdrp->spares[i]);
+        M_16_SWAP(hdrp->bitmaps[i]);
+    }
+}
+#endif