1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*7c478bd9Sstevel@tonic-gate * with the License. 8*7c478bd9Sstevel@tonic-gate * 9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 12*7c478bd9Sstevel@tonic-gate * and limitations under the License. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*7c478bd9Sstevel@tonic-gate * 20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END 21*7c478bd9Sstevel@tonic-gate */ 22*7c478bd9Sstevel@tonic-gate /* 23*7c478bd9Sstevel@tonic-gate * Copyright 1986 Sun Microsystems, Inc. All rights reserved. 24*7c478bd9Sstevel@tonic-gate * Use is subject to license terms. 25*7c478bd9Sstevel@tonic-gate */ 26*7c478bd9Sstevel@tonic-gate 27*7c478bd9Sstevel@tonic-gate /* Copyright (c) 1984 AT&T */ 28*7c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 29*7c478bd9Sstevel@tonic-gate 30*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.3 */ 31*7c478bd9Sstevel@tonic-gate 32*7c478bd9Sstevel@tonic-gate /*LINTLIBRARY*/ 33*7c478bd9Sstevel@tonic-gate /* 34*7c478bd9Sstevel@tonic-gate * Seek for standard library. Coordinates with buffering. 35*7c478bd9Sstevel@tonic-gate */ 36*7c478bd9Sstevel@tonic-gate #include <stdio.h> 37*7c478bd9Sstevel@tonic-gate 38*7c478bd9Sstevel@tonic-gate extern long lseek(); 39*7c478bd9Sstevel@tonic-gate extern int fflush(); 40*7c478bd9Sstevel@tonic-gate 41*7c478bd9Sstevel@tonic-gate int 42*7c478bd9Sstevel@tonic-gate fseek(iop, offset, ptrname) 43*7c478bd9Sstevel@tonic-gate register FILE *iop; 44*7c478bd9Sstevel@tonic-gate long offset; 45*7c478bd9Sstevel@tonic-gate int ptrname; 46*7c478bd9Sstevel@tonic-gate { 47*7c478bd9Sstevel@tonic-gate register int resync, c; 48*7c478bd9Sstevel@tonic-gate long p = -1; /* can't happen? */ 49*7c478bd9Sstevel@tonic-gate 50*7c478bd9Sstevel@tonic-gate iop->_flag &= ~_IOEOF; 51*7c478bd9Sstevel@tonic-gate if(iop->_flag & _IOREAD) { 52*7c478bd9Sstevel@tonic-gate if(ptrname < 2 && iop->_base && !(iop->_flag&_IONBF)) { 53*7c478bd9Sstevel@tonic-gate c = iop->_cnt; 54*7c478bd9Sstevel@tonic-gate p = offset; 55*7c478bd9Sstevel@tonic-gate if(ptrname == 0) { 56*7c478bd9Sstevel@tonic-gate long curpos = lseek(fileno(iop), 0L, 1); 57*7c478bd9Sstevel@tonic-gate if (curpos == -1) 58*7c478bd9Sstevel@tonic-gate return (-1); 59*7c478bd9Sstevel@tonic-gate p += c - curpos; 60*7c478bd9Sstevel@tonic-gate resync = offset&01; 61*7c478bd9Sstevel@tonic-gate } else { 62*7c478bd9Sstevel@tonic-gate offset -= (long)c; 63*7c478bd9Sstevel@tonic-gate resync = 0; 64*7c478bd9Sstevel@tonic-gate } 65*7c478bd9Sstevel@tonic-gate if(!(iop->_flag&_IORW) && c > 0 && p <= c && 66*7c478bd9Sstevel@tonic-gate p >= iop->_base - iop->_ptr) { 67*7c478bd9Sstevel@tonic-gate iop->_ptr += (int)p; 68*7c478bd9Sstevel@tonic-gate iop->_cnt -= (int)p; 69*7c478bd9Sstevel@tonic-gate return(0); 70*7c478bd9Sstevel@tonic-gate } 71*7c478bd9Sstevel@tonic-gate } else 72*7c478bd9Sstevel@tonic-gate resync = 0; 73*7c478bd9Sstevel@tonic-gate if(iop->_flag & _IORW) { 74*7c478bd9Sstevel@tonic-gate iop->_ptr = iop->_base; 75*7c478bd9Sstevel@tonic-gate iop->_flag &= ~_IOREAD; 76*7c478bd9Sstevel@tonic-gate resync = 0; 77*7c478bd9Sstevel@tonic-gate } 78*7c478bd9Sstevel@tonic-gate p = lseek(fileno(iop), offset-resync, ptrname); 79*7c478bd9Sstevel@tonic-gate iop->_cnt = 0; 80*7c478bd9Sstevel@tonic-gate if (resync && p != -1) 81*7c478bd9Sstevel@tonic-gate if (getc(iop) == EOF) 82*7c478bd9Sstevel@tonic-gate p = -1; 83*7c478bd9Sstevel@tonic-gate } else if(iop->_flag & (_IOWRT | _IORW)) { 84*7c478bd9Sstevel@tonic-gate p = fflush(iop); 85*7c478bd9Sstevel@tonic-gate iop->_cnt = 0; 86*7c478bd9Sstevel@tonic-gate if(iop->_flag & _IORW) { 87*7c478bd9Sstevel@tonic-gate iop->_flag &= ~_IOWRT; 88*7c478bd9Sstevel@tonic-gate iop->_ptr = iop->_base; 89*7c478bd9Sstevel@tonic-gate } 90*7c478bd9Sstevel@tonic-gate return(lseek(fileno(iop), offset, ptrname) == -1 || p == EOF ? 91*7c478bd9Sstevel@tonic-gate -1 : 0); 92*7c478bd9Sstevel@tonic-gate } 93*7c478bd9Sstevel@tonic-gate return((p == -1)? -1: 0); 94*7c478bd9Sstevel@tonic-gate } 95