endfile.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

*/



#pragma ident "@(#) libf/fio/endfile.c  92.2    06/18/99 18:41:40"

#include <errno.h>
#include <foreign.h>
#include <unistd.h>
#ifdef  _ABSOFT
#include "ac_sysdep.h"
#else
#include <sys/unistd.h>
#endif
#include "fio.h"
  
/*
 *      _EOFW   Fortran endfile
 */
#ifdef  _UNICOS
#pragma _CRI duplicate _EOFW as $EOFW
#endif

int
_EOFW(
        _f_int  *unump,         /* Fortran unit number */
        _f_int  *iostat,        /* IOSTAT= variable address, or NULL */
        int     errf)           /* 1 if ERR= specifier is present */
{
        register unum_t unum;
        register int    errn;           /* nonzero when error is encountered */
        unit            *cup;
        struct  ffsw    fst;
        struct fiostate cfs;
  
#if     defined(_ABSOFT) && (defined(TARGET_MAC_OS) || defined(TARGET_NT))
        mrwe_check();
#endif

        errn    = 0;
        unum    = *unump;

        STMT_BEGIN(unum, 0, T_ENDFILE, NULL, &cfs, cup); /* lock the unit */

        if (!GOOD_UNUM(unum)) {
                errn    = FEIVUNIT;     /* Invalid unit number */
                goto endfile_done;
        }
  
/*
 *      ENDFILE on unopened unit is OK, and does nothing.
 */
        if (cup == NULL)
                goto endfile_done;

        if (cup->pnonadv) {             /* There is a current record */
                if (cup->uwrt) {
                        errn    = _nonadv_endrec(&cfs, cup);
                        if (errn != 0)
                                goto endfile_done;
                }
                cup->pnonadv    = 0;    /* Flag no current record */
        }

        cup->urecpos    = 0;

        if ((cup->uaction & OS_WRITE) == 0) {
                errn    = FENOWRIT;     /* No write permission */
                goto endfile_done;
        }

        if (cup->useq == 0) {   /* If file opened for direct access */
                errn    = FEENDFIV;     /* ENDFILE not allowed on dir. acc. */
                goto endfile_done;
        }

        cup->uwrt       = 1;

        if (cup->uend && !cup->umultfil && !cup->uspcproc) {
                errn    = FEENAFEN;     /* ENDFILE after EOF */
                goto endfile_done;
        }
  
        switch (cup->ufs) {
  
        case FS_FDC:
/*
 *              See if the layer we are talking to can represent an
 *              EOF.  If not, write an EOD.  If EOFs are not permitted, then
 *              multi-files (muliple EOFs) are not allowed in the file.
 */
                if (cup->umultfil) {

                        /*
                         * Replace a previously encountered logical endfile
                         * record with a physical endfile record.
                         */
                        if ((cup->uend == LOGICAL_ENDFILE) && !(cup->uspcproc)){
                                if (XRCALL(cup->ufp.fdc, weofrtn)cup->ufp.fdc,
                                        &fst) < 0) {
                                        errn    = fst.sw_error;
                                        goto endfile_done;
                                }
                                cup->uend       = PHYSICAL_ENDFILE;
                        }

                        if (XRCALL(cup->ufp.fdc, weofrtn)cup->ufp.fdc,
                                &fst) < 0) {
                                errn    = fst.sw_error;
                                goto endfile_done;
                        }

                        cup->uend       = PHYSICAL_ENDFILE;
                }
                else {
                        if (XRCALL(cup->ufp.fdc, weodrtn)cup->ufp.fdc, &fst) < 0)
                                errn    = fst.sw_error;

                        cup->uend       = LOGICAL_ENDFILE;
                }
                break;
 
        case FS_TEXT:
        case STD:               
                cup->uend       = LOGICAL_ENDFILE;
                break;

        default:
                errn    = FEINTFST;     /* Unknown file structure */
        }
  
endfile_done:
        if (iostat != NULL)
                *iostat = errn;
        else
                if (errn != 0 && (errf == 0))
                        _ferr(&cfs, errn, unum);/* Pass unum to _ferr
                                                 * in case of FEIVUNIT error */

        STMT_END(cup, T_ENDFILE, NULL, &cfs);   /* unlock the unit */

        errn    = (errn != 0) ? IO_ERR : IO_OKAY;/* 1 if error; 0 if no error */

        return(CFT77_RETVAL(errn));
}