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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 DELETEIMAGE */
char
__rddeleteimage (p)
__bs5FILE *p;
{
long c1,
i,
l,
last;
FILE *f;
if (!((__bs1FILE *) p)->open)
__rerror ("Deleteimage: File not open");
if (((__bs2FILE *) p)->IMAGE.obj == __NULL)
__rerror ("Deleteimage: IMAGE equals notext");
if (p->loc > ((__bs5FILE *) p)->maxloc)
__rerror ("Deleteimage: File overflow");
if (p->loc < p->minwriteloc)
__rerror ("Deleteimage: Append underflow or read-only file");
if (((__bs5FILE *) p)->imagelength != ((__bs2FILE *) p)->IMAGE.length)
__rerror ("Deleteimage: Illegal length of image");
if (p->loc > (last = __rdlastloc (p)))
return (__FALSE);
if (p->lastop == __READ && fseek (((__bs1FILE *) p)->file, 0L, 1) == __EOF)
__rerror ("Deleteimage: Not possible to seek");
p->lastop = __WRITE;
l = ((__bs5FILE *) p)->imagelength;
f = ((__bs1FILE *) p)->file;
for (i = 1; i <= l; i++)
{
if (putc ('\0', f) == __EOF)
{
__rerror ("Deleteimage: Write error");
break;
}
}
if (putc ('\0', f) == __EOF)
__rerror ("Deleteimage: Write error");
((__bs2FILE *) p)->IMAGE.pos = 1;
if (p->loc == last)
{
for (i = p->loc - 1; i > 0; i--)
{
if (fseek (((__bs1FILE *) p)->file,
(((__bs5FILE *) p)->imagelength + 1) * i - 1, 0) == __EOF)
__rerror ("Deleteimage: Not possible to seek");
if ((c1 = getc (f)) == __EOF)
__rerror ("Deleteimage: Read error");
if (c1 != '\0')
break;
}
(void) fflush (f);
#if F_TRUNCATE
#ifdef mips /* Just to satisfy lint */
(void) ftruncate ((int) fileno (f), (int) ((i) * (l + 1)));
#else
(void) ftruncate ((int) fileno (f), ((i) * (l + 1)));
#endif
#endif
if (i != p->loc - 1)
{
if (fseek (((__bs1FILE *) p)->file,
(((__bs5FILE *) p)->imagelength + 1) * p->loc,
0) == __EOF)
__rerror ("Deleteimage: Not possible to seek");
p->lastop = __SEEK;
}
}
p->loc++;
return (__TRUE);
}
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