1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate * Copyright 1986 Sun Microsystems, Inc. All rights reserved.
24*0Sstevel@tonic-gate * Use is subject to license terms.
25*0Sstevel@tonic-gate */
26*0Sstevel@tonic-gate
27*0Sstevel@tonic-gate /* Copyright (c) 1984 AT&T */
28*0Sstevel@tonic-gate /* All Rights Reserved */
29*0Sstevel@tonic-gate
30*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.3 */
31*0Sstevel@tonic-gate
32*0Sstevel@tonic-gate /*LINTLIBRARY*/
33*0Sstevel@tonic-gate /*
34*0Sstevel@tonic-gate * Seek for standard library. Coordinates with buffering.
35*0Sstevel@tonic-gate */
36*0Sstevel@tonic-gate #include <stdio.h>
37*0Sstevel@tonic-gate
38*0Sstevel@tonic-gate extern long lseek();
39*0Sstevel@tonic-gate extern int fflush();
40*0Sstevel@tonic-gate
41*0Sstevel@tonic-gate int
fseek(iop,offset,ptrname)42*0Sstevel@tonic-gate fseek(iop, offset, ptrname)
43*0Sstevel@tonic-gate register FILE *iop;
44*0Sstevel@tonic-gate long offset;
45*0Sstevel@tonic-gate int ptrname;
46*0Sstevel@tonic-gate {
47*0Sstevel@tonic-gate register int resync, c;
48*0Sstevel@tonic-gate long p = -1; /* can't happen? */
49*0Sstevel@tonic-gate
50*0Sstevel@tonic-gate iop->_flag &= ~_IOEOF;
51*0Sstevel@tonic-gate if(iop->_flag & _IOREAD) {
52*0Sstevel@tonic-gate if(ptrname < 2 && iop->_base && !(iop->_flag&_IONBF)) {
53*0Sstevel@tonic-gate c = iop->_cnt;
54*0Sstevel@tonic-gate p = offset;
55*0Sstevel@tonic-gate if(ptrname == 0) {
56*0Sstevel@tonic-gate long curpos = lseek(fileno(iop), 0L, 1);
57*0Sstevel@tonic-gate if (curpos == -1)
58*0Sstevel@tonic-gate return (-1);
59*0Sstevel@tonic-gate p += c - curpos;
60*0Sstevel@tonic-gate resync = offset&01;
61*0Sstevel@tonic-gate } else {
62*0Sstevel@tonic-gate offset -= (long)c;
63*0Sstevel@tonic-gate resync = 0;
64*0Sstevel@tonic-gate }
65*0Sstevel@tonic-gate if(!(iop->_flag&_IORW) && c > 0 && p <= c &&
66*0Sstevel@tonic-gate p >= iop->_base - iop->_ptr) {
67*0Sstevel@tonic-gate iop->_ptr += (int)p;
68*0Sstevel@tonic-gate iop->_cnt -= (int)p;
69*0Sstevel@tonic-gate return(0);
70*0Sstevel@tonic-gate }
71*0Sstevel@tonic-gate } else
72*0Sstevel@tonic-gate resync = 0;
73*0Sstevel@tonic-gate if(iop->_flag & _IORW) {
74*0Sstevel@tonic-gate iop->_ptr = iop->_base;
75*0Sstevel@tonic-gate iop->_flag &= ~_IOREAD;
76*0Sstevel@tonic-gate resync = 0;
77*0Sstevel@tonic-gate }
78*0Sstevel@tonic-gate p = lseek(fileno(iop), offset-resync, ptrname);
79*0Sstevel@tonic-gate iop->_cnt = 0;
80*0Sstevel@tonic-gate if (resync && p != -1)
81*0Sstevel@tonic-gate if (getc(iop) == EOF)
82*0Sstevel@tonic-gate p = -1;
83*0Sstevel@tonic-gate } else if(iop->_flag & (_IOWRT | _IORW)) {
84*0Sstevel@tonic-gate p = fflush(iop);
85*0Sstevel@tonic-gate iop->_cnt = 0;
86*0Sstevel@tonic-gate if(iop->_flag & _IORW) {
87*0Sstevel@tonic-gate iop->_flag &= ~_IOWRT;
88*0Sstevel@tonic-gate iop->_ptr = iop->_base;
89*0Sstevel@tonic-gate }
90*0Sstevel@tonic-gate return(lseek(fileno(iop), offset, ptrname) == -1 || p == EOF ?
91*0Sstevel@tonic-gate -1 : 0);
92*0Sstevel@tonic-gate }
93*0Sstevel@tonic-gate return((p == -1)? -1: 0);
94*0Sstevel@tonic-gate }
95