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