/* gdbmsetopt.c - set options pertaining to a GDBM descriptor. */

/*  This file is part of GDBM, the GNU data base manager, by Philip A. Nelson.
    Copyright (C) 1993  Free Software Foundation, Inc.

    GDBM is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2, or (at your option)
    any later version.

    GDBM is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with GDBM; see the file COPYING.  If not, write to
    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

    You may contact the original author by:
       e-mail:  phil@cs.wwu.edu
      us-mail:  Philip A. Nelson
                Computer Science Department
                Western Washington University
                Bellingham, WA 98226
       
    The author of this file is:
       e-mail:  downsj@csos.orst.edu

*************************************************************************/

#include "gdbmdefs.h"
#include "gdbmerrno.h"

/* operate on an already open descriptor. */

/* ARGSUSED */
int gdbm_setopt(dbf, optflag, optval, optlen)
    gdbm_file_info *dbf;	/* descriptor to operate on. */
    int optflag;		/* option to set. */
    int *optval;		/* pointer to option value. */
    int optlen;			/* size of optval. */
{
  switch(optflag) {
  case GDBM_CACHESIZE:
    /* here, optval will point to the new size of the cache. */
    if(dbf->bucket_cache != NULL) {
      gdbm_errno = GDBM_OPT_ALREADY_SET;
      return(-1);
    }

    return(_gdbm_init_cache(dbf, ((*optval) > 9) ? (*optval) : 10));

  default:
    gdbm_errno = GDBM_OPT_ILLEGAL;
    return(-1);
  }
}
