text: /*-
   * See the file LICENSE for redistribution information.
   *
   * Copyright (c) 1996, 2013 Oracle and/or its affiliates.  All rights reserved.
   */
  /*
   * Copyright (c) 1990, 1993
   *	Margo Seltzer.  All rights reserved.
   */
  /*
   * 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.
   *
   * $Id$
   */
  
  #include "db_config.h"
  
  #include "db_int.h"
  
  /*
   *
   * This package provides dbm and ndbm compatible interfaces to DB.
   *
   * EXTERN: #if DB_DBM_HSEARCH != 0
   * EXTERN: int	 __db_ndbm_clearerr __P((DBM *));
   * EXTERN: void	 __db_ndbm_close __P((DBM *));
   * EXTERN: int	 __db_ndbm_delete __P((DBM *, datum));
   * EXTERN: int	 __db_ndbm_dirfno __P((DBM *));
   * EXTERN: int	 __db_ndbm_error __P((DBM *));
   * EXTERN: datum __db_ndbm_fetch __P((DBM *, datum));
   * EXTERN: datum __db_ndbm_firstkey __P((DBM *));
   * EXTERN: datum __db_ndbm_nextkey __P((DBM *));
   * EXTERN: DBM	*__db_ndbm_open __P((const char *, int, int));
   * EXTERN: int	 __db_ndbm_pagfno __P((DBM *));
   * EXTERN: int	 __db_ndbm_rdonly __P((DBM *));
   * EXTERN: int	 __db_ndbm_store __P((DBM *, datum, datum, int));
   *
   * EXTERN: int	 __db_dbm_close __P((void));
   * EXTERN: int	 __db_dbm_delete __P((datum));
   * EXTERN: datum __db_dbm_fetch __P((datum));
   * EXTERN: datum __db_dbm_firstkey __P((void));
   * EXTERN: int	 __db_dbm_init __P((char *));
   * EXTERN: datum __db_dbm_nextkey __P((datum));
   * EXTERN: int	 __db_dbm_store __P((datum, datum));
   * EXTERN: #endif
   */
  
  /*
   * The DBM routines, which call the NDBM routines.
   */
  static DBM *__cur_db;
  
  static void __db_no_open __P((void));
  
  int
  __db_dbm_init(file)
  	char *file;
  {
  	if (__cur_db != NULL)
  		dbm_close(__cur_db);
  	if ((__cur_db = dbm_open(file, O_CREAT | O_RDWR, DB_MODE_600)) != NULL)
  		return (0);
  	if ((__cur_db = dbm_open(file, O_RDONLY, 0)) != NULL)
  		return (0);
  	return (-1);
  }
  
  int
  __db_dbm_close()
  {
  	if (__cur_db != NULL) {
  		dbm_close(__cur_db);
  		__cur_db = NULL;
  	}
  	return (0);
  }
  
  datum
  __db_dbm_fetch(key)
  	datum key;
  {
  	datum item;
  
  	if (__cur_db == NULL) {
  		__db_no_open();
  		item.dptr = NULL;
  		item.dsize = 0;
  		return (item);
  	}
  	return (dbm_fetch(__cur_db, key));
  }
  
  datum
  __db_dbm_firstkey()
  {
  	datum item;
  
  	if (__cur_db == NULL) {
  		__db_no_open();
  		item.dptr = NULL;
  		item.dsize = 0;
  		return (item);
  	}
  	return (dbm_firstkey(__cur_db));
  }
  
  datum
  __db_dbm_nextkey(key)
  	datum key;
  {
  	datum item;
  
  	COMPQUIET(key.dsize, 0);
  
  	if (__cur_db == NULL) {
  		__db_no_open();
  		item.dptr = NULL;
  		item.dsize = 0;
  		return (item);
  	}
  	return (dbm_nextkey(__cur_db));
  }
  
  int
  __db_dbm_delete(key)
  	datum key;
  {
  	if (__cur_db == NULL) {
  		__db_no_open();
  		return (-1);
  	}
  	return (dbm_delete(__cur_db, key));
  }
  
  int
  __db_dbm_store(key, dat)
  	datum key, dat;
  {
  	if (__cur_db == NULL) {
  		__db_no_open();
  		return (-1);
  	}
  	return (dbm_store(__cur_db, key, dat, DBM_REPLACE));
  }
  
  static void
  __db_no_open()
  {
  	(void)fprintf(stderr, DB_STR_A("5126",
  	    "dbm: no open database.\n", "\n"));
  }
  
  /*
   * This package provides dbm and ndbm compatible interfaces to DB.
   *
   * The NDBM routines, which call the DB routines.
   */
  /*
   * Returns:
   *	*DBM on success
   *	 NULL on failure
   */
  DBM *
  __db_ndbm_open(file, oflags, mode)
  	const char *file;
  	int oflags, mode;
  {
  	DB *dbp;
  	DBC *dbc;
  	int ret;
  	char path[DB_MAXPATHLEN];
  
  	/*
  	 * !!!
  	 * Don't use sprintf(3)/snprintf(3) -- the former is dangerous, and
  	 * the latter isn't standard, and we're manipulating strings handed
  	 * us by the application.
  	 */
  	if (strlen(file) + strlen(DBM_SUFFIX) + 1 > sizeof(path)) {
  		__os_set_errno(ENAMETOOLONG);
  		return (NULL);
  	}
  	(void)strcpy(path, file);
  	(void)strcat(path, DBM_SUFFIX);
  	if ((ret = db_create(&dbp, NULL, 0)) != 0) {
  		__os_set_errno(ret);
  		return (NULL);
  	}
  
  	/*
  	 * !!!
  	 * The historic ndbm library corrected for opening O_WRONLY.
  	 */
  	if (oflags & O_WRONLY) {
  		oflags &= ~O_WRONLY;
  		oflags |= O_RDWR;
  	}
  
  	if ((ret = dbp->set_pagesize(dbp, 4096)) != 0 ||
  	    (ret = dbp->set_h_ffactor(dbp, 40)) != 0 ||
  	    (ret = dbp->set_h_nelem(dbp, 1)) != 0 ||
  	    (ret = dbp->open(dbp, NULL,
  	    path, NULL, DB_HASH, __db_openflags(oflags), mode)) != 0) {
  		__os_set_errno(ret);
  		return (NULL);
  	}
  
  	if ((ret = dbp->cursor(dbp, NULL, &dbc, 0)) != 0) {
  		(void)dbp->close(dbp, 0);
  		__os_set_errno(ret);
  		return (NULL);
  	}
  
  	return ((DBM *)dbc);
  }
  
  /*
   * Returns:
   *	Nothing.
   */
  void
  __db_ndbm_close(dbm)
  	DBM *dbm;
  {
  	DBC *dbc;
  
  	dbc = (DBC *)dbm;
  
  	(void)dbc->dbp->close(dbc->dbp, 0);
  }
  
  /*
   * Returns:
   *	DATUM on success
   *	NULL on failure
   */
  datum
  __db_ndbm_fetch(dbm, key)
  	DBM *dbm;
  	datum key;
  {
  	DBC *dbc;
  	DBT _key, _data;
  	datum data;
  	int ret;
  
  	dbc = (DBC *)dbm;
  
  	DB_INIT_DBT(_key, key.dptr, key.dsize);
  	memset(&_data, 0, sizeof(DBT));
  
  	/*
  	 * Note that we can't simply use the dbc we have to do a get/SET,
  	 * because that cursor is the one used for sequential iteration and
  	 * it has to remain stable in the face of intervening gets and puts.
  	 */
  	if ((ret = dbc->dbp->get(dbc->dbp, NULL, &_key, &_data, 0)) == 0) {
  		data.dptr = _data.data;
  		data.dsize = (int)_data.size;
  	} else {
  		data.dptr = NULL;
  		data.dsize = 0;
  		if (ret == DB_NOTFOUND)
  			__os_set_errno(ENOENT);
  		else {
  			__os_set_errno(ret);
  			F_SET(dbc->dbp, DB_AM_DBM_ERROR);
  		}
  	}
  	return (data);
  }
  
  /*
   * Returns:
   *	DATUM on success
   *	NULL on failure
   */
  datum
  __db_ndbm_firstkey(dbm)
  	DBM *dbm;
  {
  	DBC *dbc;
  	DBT _key, _data;
  	datum key;
  	int ret;
  
  	dbc = (DBC *)dbm;
  
  	memset(&_key, 0, sizeof(DBT));
  	memset(&_data, 0, sizeof(DBT));
  
  	if ((ret = dbc->get(dbc, &_key, &_data, DB_FIRST)) == 0) {
  		key.dptr = _key.data;
  		key.dsize = (int)_key.size;
  	} else {
  		key.dptr = NULL;
  		key.dsize = 0;
  		if (ret == DB_NOTFOUND)
  			__os_set_errno(ENOENT);
  		else {
  			__os_set_errno(ret);
  			F_SET(dbc->dbp, DB_AM_DBM_ERROR);
  		}
  	}
  	return (key);
  }
  
  /*
   * Returns:
   *	DATUM on success
   *	NULL on failure
   */
  datum
  __db_ndbm_nextkey(dbm)
  	DBM *dbm;
  {
  	DBC *dbc;
  	DBT _key, _data;
  	datum key;
  	int ret;
  
  	dbc = (DBC *)dbm;
  
  	memset(&_key, 0, sizeof(DBT));
  	memset(&_data, 0, sizeof(DBT));
  
  	if ((ret = dbc->get(dbc, &_key, &_data, DB_NEXT)) == 0) {
  		key.dptr = _key.data;
  		key.dsize = (int)_key.size;
  	} else {
  		key.dptr = NULL;
  		key.dsize = 0;
  		if (ret == DB_NOTFOUND)
  			__os_set_errno(ENOENT);
  		else {
  			__os_set_errno(ret);
  			F_SET(dbc->dbp, DB_AM_DBM_ERROR);
  		}
  	}
  	return (key);
  }
  
  /*
   * Returns:
   *	 0 on success
   *	<0 failure
   */
  int
  __db_ndbm_delete(dbm, key)
  	DBM *dbm;
  	datum key;
  {
  	DBC *dbc;
  	DBT _key;
  	int ret;
  
  	dbc = (DBC *)dbm;
  
  	DB_INIT_DBT(_key, key.dptr, key.dsize);
  
  	if ((ret = dbc->dbp->del(dbc->dbp, NULL, &_key, 0)) == 0)
  		return (0);
  
  	if (ret == DB_NOTFOUND)
  		__os_set_errno(ENOENT);
  	else {
  		__os_set_errno(ret);
  		F_SET(dbc->dbp, DB_AM_DBM_ERROR);
  	}
  	return (-1);
  }
  
  /*
   * Returns:
   *	 0 on success
   *	<0 failure
   *	 1 if DBM_INSERT and entry exists
   */
  int
  __db_ndbm_store(dbm, key, data, flags)
  	DBM *dbm;
  	datum key, data;
  	int flags;
  {
  	DBC *dbc;
  	DBT _key, _data;
  	int ret;
  
  	dbc = (DBC *)dbm;
  
  	DB_INIT_DBT(_key, key.dptr, key.dsize);
  	DB_INIT_DBT(_data, data.dptr, data.dsize);
  
  	if ((ret = dbc->dbp->put(dbc->dbp, NULL,
  	    &_key, &_data, flags == DBM_INSERT ? DB_NOOVERWRITE : 0)) == 0)
  		return (0);
  
  	if (ret == DB_KEYEXIST)
  		return (1);
  
  	__os_set_errno(ret);
  	F_SET(dbc->dbp, DB_AM_DBM_ERROR);
  	return (-1);
  }
  
  int
  __db_ndbm_error(dbm)
  	DBM *dbm;
  {
  	DBC *dbc;
  
  	dbc = (DBC *)dbm;
  
  	return (F_ISSET(dbc->dbp, DB_AM_DBM_ERROR));
  }
  
  int
  __db_ndbm_clearerr(dbm)
  	DBM *dbm;
  {
  	DBC *dbc;
  
  	dbc = (DBC *)dbm;
  
  	F_CLR(dbc->dbp, DB_AM_DBM_ERROR);
  	return (0);
  }
  
  /*
   * Returns:
   *	1 if read-only
   *	0 if not read-only
   */
  int
  __db_ndbm_rdonly(dbm)
  	DBM *dbm;
  {
  	DBC *dbc;
  
  	dbc = (DBC *)dbm;
  
  	return (F_ISSET(dbc->dbp, DB_AM_RDONLY) ? 1 : 0);
  }
  
  /*
   * XXX
   * We only have a single file descriptor that we can return, not two.  Return
   * the same one for both files.  Hopefully, the user is using it for locking
   * and picked one to use at random.
   */
  int
  __db_ndbm_dirfno(dbm)
  	DBM *dbm;
  {
  	return (dbm_pagfno(dbm));
  }
  
  int
  __db_ndbm_pagfno(dbm)
  	DBM *dbm;
  {
  	DBC *dbc;
  	int fd;
  
  	dbc = (DBC *)dbm;
  
  	(void)dbc->dbp->fd(dbc->dbp, &fd);
  	return (fd);
  }
  