scsh-0.5/scsh/bdbmo.c

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1995-10-13 23:34:21 -04:00
/* Scheme48/scsh Unix system interface.
** Routines that require custom C support.
** Copyright (c) 1995 by David Albertz.
*/
#include <stdio.h>
#include <errno.h>
#include <db.h>
#include <sys/types.h>
#include <limits.h>
#include "cstuff.h"
/* stub used to return TRUE when scheme checks for Berkeley dbm */
int db_check()
{
return 1;
}
scheme_value db_open_default(char *file, int flags, int mode, DB **db_ptr)
{
*db_ptr = dbopen(file, flags, mode, DB_BTREE, NULL);
if(*db_ptr == NULL)
return -1;
else
return 0;
}
/* Open a btree type database
Note: if pass_info is set to zero, all subsequent arguments are
ignored, otherwise they are loaded into a BTREEINFO structure
and passed to the open routine */
scheme_value db_open_btree (char *file, int flags, int mode, int pass_info,
int access_flags, int cachesize, int maxkeypage,
int minkeypage, int psize, int lorder, DB **db_ptr)
{
BTREEINFO btree;
if (pass_info)
{
btree.flags = access_flags;
btree.cachesize = cachesize;
btree.maxkeypage = maxkeypage;
btree.minkeypage = minkeypage;
btree.psize = psize;
btree.compare = NULL;
btree.prefix = NULL;
btree.lorder = lorder;
*db_ptr = dbopen(file, flags, mode, DB_BTREE, &btree);
}
else
*db_ptr = dbopen(file, flags, mode, DB_BTREE, NULL);
if(*db_ptr == NULL)
return -1;
else
return 0;
}
/* Open a hash type database (same use of pass_info as in btree) */
scheme_value db_open_hash (char *file, int flags, int mode, int pass_info,
int bsize, int ffactor, int nelem, int cachesize,
int lorder, DB **db_ptr)
{
HASHINFO hash;
if (pass_info)
{
hash.bsize = bsize;
hash.ffactor = ffactor;
hash.nelem = nelem;
hash.cachesize = cachesize;
hash.hash = NULL;
hash.lorder = lorder;
*db_ptr = dbopen(file, flags, mode, DB_HASH, &hash);
}
else
*db_ptr = dbopen(file, flags, mode, DB_HASH, NULL);
if(*db_ptr == NULL)
return -1;
else
return 0;
}
/* Open a recno type database (with same use of pass_info again) */
scheme_value db_open_recno (char *file, int flags, int mode, int pass_info,
int access_flags, int cachesize, int psize, int lorder,
int reclen, char bval, char *bfname, DB **db_ptr)
{
RECNOINFO recno;
if (pass_info)
{
recno.flags = access_flags;
recno.cachesize = cachesize;
recno.psize = psize;
recno.lorder = lorder;
recno.reclen = reclen;
recno.bval = bval;
recno.bfname = bfname;
*db_ptr = dbopen(file, flags, mode, DB_RECNO, &recno);
}
else
*db_ptr = dbopen(file, flags, mode, DB_RECNO, NULL);
if(*db_ptr == NULL)
return -1;
else
return 0;
}