text: /*	$NetBSD: ndbm.c,v 1.17.2.1 2004/04/30 03:46:39 jmc Exp $	*/
  
  /*-
   * Copyright (c) 1990, 1993
   *	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. 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.
   */
  
  #include <sys/cdefs.h>
  #if defined(LIBC_SCCS) && !defined(lint)
  #if 0
  static char sccsid[] = "@(#)ndbm.c	8.4 (Berkeley) 7/21/94";
  #else
  __RCSID("$NetBSD: ndbm.c,v 1.17.2.1 2004/04/30 03:46:39 jmc Exp $");
  #endif
  #endif /* LIBC_SCCS and not lint */
  
  /*
   * This package provides a dbm compatible interface to the new hashing
   * package described in db(3).
   */
  #include "namespace.h"
  #include <sys/param.h>
  
  #include <fcntl.h>
  #include <stdio.h>
  #include <string.h>
  
  #include <ndbm.h>
  #include "hash.h"
  
  #ifdef __weak_alias
  __weak_alias(dbm_clearerr,_dbm_clearerr)
  __weak_alias(dbm_close,_dbm_close)
  __weak_alias(dbm_delete,_dbm_delete)
  __weak_alias(dbm_dirfno,_dbm_dirfno)
  __weak_alias(dbm_error,_dbm_error)
  __weak_alias(dbm_fetch,_dbm_fetch)
  __weak_alias(dbm_firstkey,_dbm_firstkey)
  __weak_alias(dbm_nextkey,_dbm_nextkey)
  __weak_alias(dbm_open,_dbm_open)
  __weak_alias(dbm_store,_dbm_store)
  #endif
  
  /*
   * Returns:
   * 	*DBM on success
   *	 NULL on failure
   */
  extern DBM *
  dbm_open(file, flags, mode)
  	const char *file;
  	int flags;
  	mode_t mode;
  {
  	HASHINFO info;
  	char path[MAXPATHLEN];
  
  	info.bsize = 4096;
  	info.ffactor = 40;
  	info.nelem = 1;
  	info.cachesize = 0;
  	info.hash = NULL;
  	info.lorder = 0;
  	(void)strncpy(path, file, sizeof(path) - 1);
  	(void)strncat(path, DBM_SUFFIX, sizeof(path) - strlen(path) - 1);
  	if ((flags & O_ACCMODE) == O_WRONLY) {
  		flags &= ~O_WRONLY;
  		flags |= O_RDWR;
  	}
  	return ((DBM *)__hash_open(path, flags, mode, &info, 0));
  }
  
  extern void
  dbm_close(db)
  	DBM *db;
  {
  	(void)(db->close)(db);
  }
  
  /*
   * Returns:
   *	DATUM on success
   *	NULL on failure
   */
  extern datum
  dbm_fetch(db, key)
  	DBM *db;
  	datum key;
  {
  	datum retdata;
  	int status;
  	DBT dbtkey, dbtretdata;
  
  	dbtkey.data = key.dptr;
  	dbtkey.size = key.dsize;
  	status = (db->get)(db, &dbtkey, &dbtretdata, 0);
  	if (status) {
  		dbtretdata.data = NULL;
  		dbtretdata.size = 0;
  	}
  	retdata.dptr = dbtretdata.data;
  	retdata.dsize = dbtretdata.size;
  	return (retdata);
  }
  
  /*
   * Returns:
   *	DATUM on success
   *	NULL on failure
   */
  extern datum
  dbm_firstkey(db)
  	DBM *db;
  {
  	int status;
  	datum retkey;
  	DBT dbtretkey, dbtretdata;
  
  	status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
  	if (status)
  		dbtretkey.data = NULL;
  	retkey.dptr = dbtretkey.data;
  	retkey.dsize = dbtretkey.size;
  	return (retkey);
  }
  
  /*
   * Returns:
   *	DATUM on success
   *	NULL on failure
   */
  extern datum
  dbm_nextkey(db)
  	DBM *db;
  {
  	int status;
  	datum retkey;
  	DBT dbtretkey, dbtretdata;
  
  	status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
  	if (status)
  		dbtretkey.data = NULL;
  	retkey.dptr = dbtretkey.data;
  	retkey.dsize = dbtretkey.size;
  	return (retkey);
  }
  
  /*
   * Returns:
   *	 0 on success
   *	<0 failure
   */
  extern int
  dbm_delete(db, key)
  	DBM *db;
  	datum key;
  {
  	int status;
  	DBT dbtkey;
  
  	dbtkey.data = key.dptr;
  	dbtkey.size = key.dsize;
  	status = (db->del)(db, &dbtkey, 0);
  	if (status)
  		return (-1);
  	else
  		return (0);
  }
  
  /*
   * Returns:
   *	 0 on success
   *	<0 failure
   *	 1 if DBM_INSERT and entry exists
   */
  extern int
  dbm_store(db, key, data, flags)
  	DBM *db;
  	datum key, data;
  	int flags;
  {
  	DBT dbtkey, dbtdata;
  
  	dbtkey.data = key.dptr;
  	dbtkey.size = key.dsize;
  	dbtdata.data = data.dptr;
  	dbtdata.size = data.dsize;
  	return ((db->put)(db, &dbtkey, &dbtdata,
  	    (u_int)((flags == DBM_INSERT) ? R_NOOVERWRITE : 0)));
  }
  
  extern int
  dbm_error(db)
  	DBM *db;
  {
  	HTAB *hp;
  
  	hp = (HTAB *)db->internal;
  	return (hp->err);
  }
  
  extern int
  dbm_clearerr(db)
  	DBM *db;
  {
  	HTAB *hp;
  
  	hp = (HTAB *)db->internal;
  	hp->err = 0;
  	return (0);
  }
  
  extern int
  dbm_dirfno(db)
  	DBM *db;
  {
  	return(((HTAB *)db->internal)->fp);
  }
  