Re-add Tokyo Cabinet DBM support.

* libmu_dbm/tokyo.c: New file.
* libmu_dbm/Makefile.am (libmu_dbm_la_SOURCES): Add tokyo.c.
* doc/texinfo/programs.texi: Update.
* README: Update.

@@ -287,10 +287,6 @@ use DBM-based mail box quotas with maildag.
 
 	Use Tokyo Cabinet DBM
 
-        Only one dbm option may be specified. Which one depends on
-        the flavor of DBM you are using. GDBM is most common for GNU
-        system.
-
 Use following options to disable support for particular protocols or
 features:
 

@@ -5648,8 +5648,8 @@ The mailbox quota can be retrieved from the following sources:
 
 To use @acronym{DBM} quota database, GNU Mailutils must
 be compiled with one of the following command line options:
-@option{--with-gdbm}, @option{--with-berkeley-db}, or
-@option{--with-ndbm}.  Examine the output of @command{maidag
+@option{--with-gdbm}, @option{--with-berkeley-db}, @option{--with-ndbm},
+or @option{--with-tokyocabinet}.  Examine the output of @command{maidag
 --show-config-options}, if not sure. 
 
 The quota database should have the following structure:

@@ -36,7 +36,8 @@ libmu_dbm_la_SOURCES = \
  store.c\
  berkeley.c\
  gdbm.c\
- ndbm.c
+ ndbm.c\
+ tokyo.c
 
 noinst_HEADERS = mudbm.h
 

+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General
+   Public License along with this library.  If not, see
+   <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <mailutils/types.h>
+#include <mailutils/dbm.h>
+#include <mailutils/util.h>
+#include <mailutils/errno.h>
+#include <mailutils/error.h>
+#include <mailutils/stream.h>
+#include <mailutils/io.h>
+#include "mudbm.h"
+
+#if defined(WITH_TOKYOCABINET)
+#include <tcutil.h>
+#include <tchdb.h>
+
+static int
+_tc_file_safety (mu_dbm_file_t db, int mode, uid_t owner)
+{
+  return mu_file_safety_check (db->db_name, mode, owner, NULL);
+}
+
+int
+_tc_get_fd (mu_dbm_file_t db, int *pag, int *dir)
+{
+  TCHDB *hdb = db->db_descr;
+  *pag = hdb->fd;
+  if (dir)
+    *dir = *pag;
+  return 0;
+}
+
+static int
+_tc_open (mu_dbm_file_t db, int flags, int mode)
+{
+  int f;
+  bool result;
+  mode_t save_um;
+  TCHDB *hdb;
+
+  switch (flags)
+    {
+    case MU_STREAM_CREAT:
+      f = HDBOWRITER | HDBOCREAT;
+      break;
+
+    case MU_STREAM_READ:
+      f = HDBOREADER;
+      break;
+
+    case MU_STREAM_RDWR:
+      f = HDBOREADER | HDBOWRITER;
+      break;
+
+    default:
+      return EINVAL;
+    }
+
+  hdb = tchdbnew ();
+
+  save_um = umask (0666 & ~mode);
+  result = tchdbopen (hdb, db->db_name, f);
+  umask (save_um);
+  if (!result)
+    {
+      db->db_errno.n = tchdbecode (hdb);
+      return MU_ERR_FAILURE;
+    }
+  db->db_descr = hdb;
+  return 0;
+}
+
+static int
+_tc_close (mu_dbm_file_t db)
+{
+  if (db->db_descr)
+    {
+      TCHDB *hdb = db->db_descr;
+      tchdbclose (hdb);
+      tchdbdel (hdb);
+      db->db_descr = NULL;
+    }
+  return 0;
+}
+
+static int
+_tc_fetch (mu_dbm_file_t db, struct mu_dbm_datum const *key,
+	   struct mu_dbm_datum *ret)
+{
+  TCHDB *hdb = db->db_descr;
+  void *ptr;
+  int retsize;
+
+  ptr = tchdbget (hdb, key->mu_dptr, key->mu_dsize, &retsize);
+  if (ptr)
+    {
+      mu_dbm_datum_free (ret);
+      ret->mu_dptr = ptr;
+      ret->mu_dsize = retsize;
+      return 0;
+    }
+  else if ((db->db_errno.n = tchdbecode (hdb)) == TCENOREC)
+    return MU_ERR_NOENT;
+  return MU_ERR_FAILURE;
+}
+
+static int
+_tc_store (mu_dbm_file_t db,
+	   struct mu_dbm_datum const *key,
+	   struct mu_dbm_datum const *contents,
+	   int replace)
+{
+  TCHDB *hdb = db->db_descr;
+  bool result;
+
+  if (replace)
+    result = tchdbput (hdb, key->mu_dptr, key->mu_dsize,
+		       contents->mu_dptr, contents->mu_dsize);
+  else
+    result = tchdbputkeep (hdb, key->mu_dptr, key->mu_dsize,
+			   contents->mu_dptr, contents->mu_dsize);
+  if (result)
+    return 0;
+  db->db_errno.n = tchdbecode (hdb);
+  if (db->db_errno.n == TCEKEEP)
+    return MU_ERR_EXISTS;
+  return MU_ERR_FAILURE;
+}
+
+static int
+_tc_delete (mu_dbm_file_t db, struct mu_dbm_datum const *key)
+{
+  TCHDB *hdb = db->db_descr;
+
+  if (tchdbout (hdb, key->mu_dptr, key->mu_dsize))
+    return 0;
+  db->db_errno.n = tchdbecode (hdb);
+  if (db->db_errno.n == TCENOREC)
+    return MU_ERR_NOENT;
+  return MU_ERR_FAILURE;
+}
+
+static int
+_tc_firstkey (mu_dbm_file_t db, struct mu_dbm_datum *ret)
+{
+  TCHDB *hdb = db->db_descr;
+  void *ptr;
+  int retsize;
+
+  tchdbiterinit (hdb);
+  ptr = tchdbiternext (hdb, &retsize);
+  if (ptr)
+    {
+      mu_dbm_datum_free (ret);
+      ret->mu_dptr = ptr;
+      ret->mu_dsize = retsize;
+      return 0;
+    }
+  else if ((db->db_errno.n = tchdbecode (hdb)) == TCENOREC)
+    return MU_ERR_NOENT;
+  return MU_ERR_FAILURE;
+}
+
+static int
+_tc_nextkey (mu_dbm_file_t db, struct mu_dbm_datum *ret)
+{
+  TCHDB *hdb = db->db_descr;
+  void *ptr;
+  int retsize;
+
+  ptr = tchdbiternext (hdb, &retsize);
+  if (ptr)
+    {
+      mu_dbm_datum_free (ret);
+      ret->mu_dptr = ptr;
+      ret->mu_dsize = retsize;
+      return 0;
+    }
+  else if ((db->db_errno.n = tchdbecode (hdb)) == TCENOREC)
+    return MU_ERR_NOENT;
+  return MU_ERR_FAILURE;
+}
+
+static void
+_tc_datum_free (struct mu_dbm_datum *datum)
+{
+  free (datum->mu_dptr);
+}
+
+static char const *
+_tc_strerror (mu_dbm_file_t db)
+{
+  return tchdberrmsg (db->db_errno.n);
+}
+
+struct mu_dbm_impl _mu_dbm_tokyokabinet = {
+  "tc",
+  _tc_file_safety,
+  _tc_get_fd,
+  _tc_open,
+  _tc_close,
+  _tc_fetch,
+  _tc_store,
+  _tc_delete,
+  _tc_firstkey,
+  _tc_nextkey,
+  _tc_datum_free,
+  _tc_strerror
+};
+#endif