#define STANDALONE      1
/*
* Database functions
* Copyright (C) Andrew Tridgell 1999
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms AND provided that this software or
* any derived work is only used as part of the PPP daemon (pppd)
* and related utilities.
* The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Note: this software is also available under the Gnu Public License
* version 2 or later.
*/

typedef unsigned tdb_len;
typedef unsigned tdb_off;

#define TDB_MAGIC_FOOD "TDB file\n"

/* this is stored at the front of every database */
struct tdb_header {
       char magic_food[32]; /* for /etc/magic */
       unsigned version; /* version of the code */
       unsigned hash_size; /* number of hash entries */
};

typedef struct {
       char *dptr;
       size_t dsize;
} TDB_DATA;

/* this is the context structure that is returned from a db open */
typedef struct {
       char *name; /* the name of the database */
       void *map_ptr; /* where it is currently mapped */
       int fd; /* open file descriptor for the database */
       tdb_len map_size; /* how much space has been mapped */
       int read_only; /* opened read-only */
       int *locked; /* set if we have a chain locked */
       int ecode; /* error code for last tdb error */
       struct tdb_header header; /* a cached copy of the header */
} TDB_CONTEXT;

/* flags to tdb_store() */
#define TDB_REPLACE 1
#define TDB_INSERT 2

/* flags for tdb_open() */
#define TDB_CLEAR_IF_FIRST 1

/* error codes */
enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK,
               TDB_ERR_OOM, TDB_ERR_EXISTS};

#if STANDALONE
TDB_CONTEXT *tdb_open(char *name, int hash_size, int tdb_flags,
                     int open_flags, mode_t mode);
char *tdb_errorstr(TDB_CONTEXT *tdb);
int tdb_writelock(TDB_CONTEXT *tdb);
int tdb_writeunlock(TDB_CONTEXT *tdb);
TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key);
int tdb_delete(TDB_CONTEXT *tdb, TDB_DATA key);
int tdb_store(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, int flag);
int tdb_close(TDB_CONTEXT *tdb);
TDB_DATA tdb_firstkey(TDB_CONTEXT *tdb);
TDB_DATA tdb_nextkey(TDB_CONTEXT *tdb, TDB_DATA key);
int tdb_traverse(TDB_CONTEXT *tdb,
       int (*fn)(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state),
       void *state);
int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key);
int     tdb_chainlock(TDB_CONTEXT *tdb, TDB_DATA key);
int     tdb_chainunlock(TDB_CONTEXT *tdb, TDB_DATA key);
#endif