1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1986 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.2 */ 31 32 /*LINTLIBRARY*/ 33 /* 34 * Return file offset. 35 * Coordinates with buffering. 36 */ 37 #include <stdio.h> 38 39 extern long lseek(); 40 41 long 42 ftell(iop) 43 register FILE *iop; 44 { 45 register long tres; 46 register int adjust; 47 48 if(iop->_cnt < 0) 49 iop->_cnt = 0; 50 if(iop->_flag & _IOREAD) 51 adjust = - iop->_cnt; 52 else if(iop->_flag & (_IOWRT | _IORW)) { 53 adjust = 0; 54 if(iop->_flag & _IOWRT && iop->_base && 55 (iop->_flag & _IONBF) == 0) 56 adjust = iop->_ptr - iop->_base; 57 } else 58 return(-1); 59 tres = lseek(fileno(iop), 0L, 1); 60 if(tres >= 0) 61 tres += (long)adjust; 62 return(tres); 63 } 64