cifunitdir.c

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/*

  Copyright (C) 2000, 2001 Silicon Graphics, Inc.  All Rights Reserved.

  This program is free software; you can redistribute it and/or modify it
  under the terms of version 2.1 of the GNU Lesser General Public License 
  as published by the Free Software Foundation.

  This program is distributed in the hope that it would be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  

  Further, this software is distributed without any warranty that it is
  free of the rightful claim of any third person regarding infringement 
  or the like.  Any license provided herein, whether implied or 
  otherwise, applies only to this software file.  Patent licenses, if
  any, provided herein do not apply to combinations of this program with 
  other software, or any other product whatsoever.  

  You should have received a copy of the GNU Lesser General Public 
  License along with this program; if not, write the Free Software 
  Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, 
  USA.

  Contact information:  Silicon Graphics, Inc., 1600 Amphitheatre Pky,
  Mountain View, CA 94043, or:

  http://www.sgi.com

  For further information regarding this notice, see:

  http://oss.sgi.com/projects/GenInfo/NoticeExplan

*/


static char USMID[] = "@(#) libcif/cifunitdir.c 30.2    07/26/96 07:19:13";


/*
 *      Cif_Getunitdir returns the unit directory for the requested unit from
 *      an open sorted CIF.
 */

#define CIF_VERSION 3

#ifdef _ABSOFT
#include "cif.h"
#else
#include <cif.h>
#endif

#include <memory.h>
#include <stdio.h>

#include "cif_int.h"

int
Cif_Getunitdir
#ifdef __STDC__
(int cifd, struct Cif_unittbl *utp, struct Cif_unitdir **unitdir)
#else
(cifd, utp, unitdir)
int cifd;
struct Cif_unittbl *utp;
struct Cif_unitdir **unitdir;
#endif
{

        FILE *fd;
        int i, n;
        struct Cif_unitdir *udp;
        struct Cif_urectbl *urp;

        char buf[64];
        struct Cif_urectbl ur[CIF_MAXRECORD];
        struct Cif_unit unit;

        int status = 0;                         /* status value */
        
        if (cifd < 0 || cifd > CIF_FT_SIZE || _Cif_filetbl[cifd].form == NOT_A_CIF)
                return (CIF_NOTOPEN);
        else if (_Cif_filetbl[cifd].optype == 'w' || _Cif_filetbl[cifd].form ==
                        ASCII_CIF || _Cif_filetbl[cifd].seek == NO)
                return (CIF_BADREQ);
        _Cif_filetbl[cifd].ifull = NO;

        /* Position the file to the start of the unit, read the unit record and
         * discard it.
         */

        fd = _Cif_filetbl[cifd].fd;
        if (fseek (fd, utp->unitpos, 0))
                return (CIF_SYSERR);
        if (fread (&unit, _Cif_shortsize[CIF_UNIT][_Cif_filetbl[cifd].version], 1, fd) != 1) IO_ERROR;
        if ((n = unit.nlen) > 0)
                if (fread (buf, sizeof(char), n, fd) != n) IO_ERROR;

        /* Read in the unit directory structure, then the individual record
         * entries.  Expand to the full directory structure.
         */

        i = _Cif_filetbl[cifd].mode;
        /*
         * If memory management mode isn't set, then set to FIXED.  If the
         * mode is FIXED, reset the amount of buffer used.
         */

        if (i == CIF_MEM_DEFAULT) {
          if ((status = Cif_Memmode (cifd, CIF_MEM_FIXED)) != 0)
            return (status);
          i = _Cif_filetbl[cifd].mode;
        }
        if (i == CIF_MEM_FIXED)
          _Cif_memarea[_Cif_filetbl[cifd].fme].mused = 0;

        udp = *unitdir = (struct Cif_unitdir *) _Cif_space[i]
                                           (_Cif_structsize[CIF_UNITDIR][_Cif_filetbl[cifd].return_version], cifd);
        if (udp == NULL)
                return (CIF_NOMEM);
        if (fread ((char *)udp, _Cif_shortsize[CIF_UNITDIR][_Cif_filetbl[cifd].version], 1, fd) != 1) IO_ERROR;

/* should map this */

        n = sizeof(struct Cif_urectbl) * CIF_MAXRECORD;
        urp = udp->ur = (struct Cif_urectbl *) _Cif_space[i] (n, cifd);
        if (urp == NULL)
                return (CIF_NOMEM);
        (void) memset ((char *)urp, '\0', n);
        n = udp->nsections;
        if (fread ((char *)ur, sizeof(struct Cif_urectbl), n, fd) != n) IO_ERROR;
        for (i = 0; i < n; i++) {
                urp[ur[i].rectype] = ur[i];

                  /* mask out those records that this cif version (eg v1) doesn't know about */

                  if (_Cif_shortsize[ur[i].rectype][_Cif_filetbl[cifd].return_version] == 0)
                    urp[ur[i].rectype].nrecords = 0;
                }

        if (_Cif_filetbl[cifd].return_version == 1)
                udp->nsections = CIF_MAXRECORD_1;
        else
                udp->nsections = CIF_MAXRECORD;

        return (0);
}