add dbm_dirfno, dbm_pagfno functions

[unix-history] / usr / src / lib / libc / db / hash / ndbm.c

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Margo Seltzer.
*
* %sccs.include.redist.c%
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ndbm.c      5.10 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

/*
* This package provides a dbm compatible interface to the new hashing
* package described in db(3).
*/

#include <sys/param.h>
#define __DBINTERFACE_PRIVATE
#include <ndbm.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include "hash.h"

/*
* Returns:
*      *DBM on success
*       NULL on failure
*/
extern DBM *
dbm_open(file, flags, mode)
       const char *file;
       int flags, mode;
{
       HASHINFO info;
       char path[MAXPATHLEN];

       info.bsize = 1024;
       info.ffactor = 5;
       info.nelem = 1;
       info.cachesize = NULL;
       info.hash = NULL;
       info.lorder = 0;
       (void)strcpy(path, file);
       (void)strcat(path, DBM_SUFFIX);
       return ((DBM *)__hash_open(path, flags, mode, &info));
}

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 retval;
       int status;

       status = (db->get)(db, (DBT *)&key, (DBT *)&retval, 0);
       if (status) {
               retval.dptr = NULL;
               retval.dsize = 0;
       }
       return (retval);
}

/*
* Returns:
*      DATUM on success
*      NULL on failure
*/
extern datum
dbm_firstkey(db)
       DBM *db;
{
       int status;
       datum retdata, retkey;

       status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_FIRST);
       if (status)
               retkey.dptr = NULL;
       return (retkey);
}

/*
* Returns:
*      DATUM on success
*      NULL on failure
*/
extern datum
dbm_nextkey(db)
       DBM *db;
{
       int status;
       datum retdata, retkey;

       status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_NEXT);
       if (status)
               retkey.dptr = NULL;
       return (retkey);
}
/*
* Returns:
*       0 on success
*      <0 failure
*/
extern int
dbm_delete(db, key)
       DBM *db;
       datum key;
{
       int status;

       status = (db->del)(db, (DBT *)&key, 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, content, flags)
       DBM *db;
       datum key, content;
       int flags;
{
       return ((db->put)(db, (DBT *)&key, (DBT *)&content,
           (flags == DBM_INSERT) ? R_NOOVERWRITE : 0));
}

extern int
dbm_error(db)
       DBM *db;
{
       HTAB *hp;

       hp = (HTAB *)db->internal;
       return (hp->errno);
}

extern int
dbm_clearerr(db)
       DBM *db;
{
       HTAB *hp;

       hp = (HTAB *)db->internal;
       hp->errno = 0;
       return (0);
}

dbm_dirfno(db)
       DBM *db;
{
       return(((HTAB *)db->internal)->fp);
}

dbm_pagfno(db)
       DBM *db;
{
#define PAGFNOERR       "ndbm: hash: dbm_pagfno not available\n"
       (void)write(STDERR_FILENO, PAGFNOERR, sizeof(PAGFNOERR) - 1);
       abort();
}