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/* $Id: $ */
/* Copyright (C) 1997 Sverre Hvammen Johansen,
* Department of Informatics, University of Oslo.
*
* This program 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; version 2.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "file.h"
#include "simfile.h"
/******************************************************************************
BOOLEAN PROCEDURE OPEN */
char
__rdopen (p, t)
__bs5FILE *p;
__txtvp t;
{
long loc;
if (!((__bs1FILE *) p)->open)
{
((__bs1FILE *) p)->file
= fopen (((__bs1FILE *) p)->filename.obj->string, "r");
if (((__bs1FILE *) p)->file != __NULL)
(void) fclose (((__bs1FILE *) p)->file);
if (((__bs1FILE *) p)->create == __CREATE
&& ((__bs1FILE *) p)->file != __NULL)
return (__FALSE);
if (((__bs1FILE *) p)->create == __NOCREATE
&& ((__bs1FILE *) p)->file == __NULL)
return (__FALSE);
#if VMS_DIRECTFILE
if (((__bs1FILE *) p)->file == __NULL)
{
if ((((__bs1FILE *) p)->file
= fopen (((__bs1FILE *) p)->filename.obj->string
,"w")) == __NULL)
return (__FALSE);
(void) fclose (((__bs1FILE *) p)->file);
}
if ((((__bs1FILE *) p)->file
= fopen (((__bs1FILE *) p)->filename.obj->string
,"r+")) == __NULL)
return (__FALSE);
#else
if ((((__bs1FILE *) p)->file
= fopen (((__bs1FILE *) p)->filename.obj->string
,((__bs1FILE *) p)->file == __NULL ? "w+" :
((__bs1FILE *) p)->readwrite == __READONLY ? "r" : "r+")) == __NULL)
return (__FALSE);
#endif
if (((__bs1FILE *) p)->append == __APPEND)
{
if (fseek (((__bs1FILE *) p)->file, 0L, 2) == __EOF)
{
(void) fclose (((__bs1FILE *) p)->file);
return (__FALSE);
}
loc = ftell (((__bs1FILE *) p)->file);
}
else
loc = 0;
p->loc = loc / (t->length + 1) + 1;
if (loc % (t->length + 1))
__rerror ("Open: Illegal size on direct-file");
p->minwriteloc = p->loc;
p->lastop = __SEEK;
p->maxloc = (MAX_INT - 1) / (t->length + 1);
if (((__bs1FILE *) p)->readwrite == __READONLY)
p->minwriteloc = MAX_INT;
if (((__bs1FILE *) p)->readwrite == __WRITEONLY)
p->writeonly = __TRUE;
((__bs2FILE *) p)->IMAGE.obj = t->obj;
((__bs2FILE *) p)->IMAGE.length = t->length;
((__bs2FILE *) p)->IMAGE.pos = 1;
((__bs2FILE *) p)->IMAGE.start = t->start;
((__bs5FILE *) p)->endfile = __FALSE;
((__bs5FILE *) p)->imagelength = t->length;
return (((__bs1FILE *) p)->open = __TRUE);
}
else
return (__FALSE);
}
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