/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1986 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.3 */
/*LINTLIBRARY*/
/*
* Seek for standard library. Coordinates with buffering.
*/
#include <stdio.h>
extern long lseek();
extern int fflush();
int
fseek(iop, offset, ptrname)
register FILE *iop;
long offset;
int ptrname;
{
register int resync, c;
long p = -1; /* can't happen? */
iop->_flag &= ~_IOEOF;
if(iop->_flag & _IOREAD) {
if(ptrname < 2 && iop->_base && !(iop->_flag&_IONBF)) {
c = iop->_cnt;
p = offset;
if(ptrname == 0) {
long curpos = lseek(fileno(iop), 0L, 1);
if (curpos == -1)
return (-1);
p += c - curpos;
resync = offset&01;
} else {
offset -= (long)c;
resync = 0;
}
if(!(iop->_flag&_IORW) && c > 0 && p <= c &&
p >= iop->_base - iop->_ptr) {
iop->_ptr += (int)p;
iop->_cnt -= (int)p;
return(0);
}
} else
resync = 0;
if(iop->_flag & _IORW) {
iop->_ptr = iop->_base;
iop->_flag &= ~_IOREAD;
resync = 0;
}
p = lseek(fileno(iop), offset-resync, ptrname);
iop->_cnt = 0;
if (resync && p != -1)
if (getc(iop) == EOF)
p = -1;
} else if(iop->_flag & (_IOWRT | _IORW)) {
p = fflush(iop);
iop->_cnt = 0;
if(iop->_flag & _IORW) {
iop->_flag &= ~_IOWRT;
iop->_ptr = iop->_base;
}
return(lseek(fileno(iop), offset, ptrname) == -1 || p == EOF ?
-1 : 0);
}
return((p == -1)? -1: 0);
}