11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1990, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * This code is derived from software contributed to Berkeley by 61573Srgrimes * Chris Torek. 71573Srgrimes * 81573Srgrimes * Redistribution and use in source and binary forms, with or without 91573Srgrimes * modification, are permitted provided that the following conditions 101573Srgrimes * are met: 111573Srgrimes * 1. Redistributions of source code must retain the above copyright 121573Srgrimes * notice, this list of conditions and the following disclaimer. 131573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141573Srgrimes * notice, this list of conditions and the following disclaimer in the 151573Srgrimes * documentation and/or other materials provided with the distribution. 16249808Semaste * 3. Neither the name of the University nor the names of its contributors 171573Srgrimes * may be used to endorse or promote products derived from this software 181573Srgrimes * without specific prior written permission. 191573Srgrimes * 201573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301573Srgrimes * SUCH DAMAGE. 311573Srgrimes */ 321573Srgrimes 331573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 3423663Speterstatic char sccsid[] = "@(#)ftell.c 8.2 (Berkeley) 5/4/95"; 351573Srgrimes#endif /* LIBC_SCCS and not lint */ 3692986Sobrien#include <sys/cdefs.h> 3792986Sobrien__FBSDID("$FreeBSD$"); 381573Srgrimes 3971579Sdeischen#include "namespace.h" 4043782Sdt#include <sys/types.h> 4182588Sache#include <errno.h> 4282588Sache#include <limits.h> 431573Srgrimes#include <stdio.h> 4471579Sdeischen#include "un-namespace.h" 451573Srgrimes#include "local.h" 4635129Sjb#include "libc_private.h" 471573Srgrimes 481573Srgrimes/* 4943782Sdt * standard ftell function. 501573Srgrimes */ 511573Srgrimeslong 52249810Semasteftell(FILE *fp) 531573Srgrimes{ 5492889Sobrien off_t rv; 5582588Sache 5643782Sdt rv = ftello(fp); 5782588Sache if (rv > LONG_MAX) { 5843782Sdt errno = EOVERFLOW; 5943782Sdt return (-1); 6043782Sdt } 6143782Sdt return (rv); 6243782Sdt} 6343782Sdt 6443782Sdt/* 6543782Sdt * ftello: return current offset. 6643782Sdt */ 6743782Sdtoff_t 68249810Semasteftello(FILE *fp) 6943782Sdt{ 7082709Sache fpos_t rv; 7182709Sache int ret; 7282668Sache 7382668Sache FLOCKFILE(fp); 7482709Sache ret = _ftello(fp, &rv); 7582668Sache FUNLOCKFILE(fp); 7682709Sache if (ret) 7782709Sache return (-1); 7882736Sache if (rv < 0) { /* Unspecified value because of ungetc() at 0 */ 7982736Sache errno = ESPIPE; 8082736Sache return (-1); 8182736Sache } 8282668Sache return (rv); 8382668Sache} 8482668Sache 8582709Sacheint 86249810Semaste_ftello(FILE *fp, fpos_t *offset) 8782668Sache{ 8892889Sobrien fpos_t pos; 8982588Sache size_t n; 901573Srgrimes 911573Srgrimes if (fp->_seek == NULL) { 921573Srgrimes errno = ESPIPE; /* historic practice */ 9382709Sache return (1); 941573Srgrimes } 951573Srgrimes 961573Srgrimes /* 971573Srgrimes * Find offset of underlying I/O object, then 981573Srgrimes * adjust for buffered bytes. 991573Srgrimes */ 100291050Sache if (!(fp->_flags & __SRD) && (fp->_flags & __SWR) && 101291050Sache fp->_p != NULL && fp->_p - fp->_bf._base > 0 && 102291050Sache ((fp->_flags & __SAPP) || (fp->_flags2 & __S2OAP))) { 103291050Sache pos = _sseek(fp, (fpos_t)0, SEEK_END); 104291050Sache if (pos == -1) 105291050Sache return (1); 106291050Sache } else if (fp->_flags & __SOFF) 1071573Srgrimes pos = fp->_offset; 10882734Sache else { 10982807Sache pos = _sseek(fp, (fpos_t)0, SEEK_CUR); 11082668Sache if (pos == -1) 11182709Sache return (1); 1121573Srgrimes } 1131573Srgrimes if (fp->_flags & __SRD) { 1141573Srgrimes /* 1151573Srgrimes * Reading. Any unread characters (including 1161573Srgrimes * those from ungetc) cause the position to be 1171573Srgrimes * smaller than that in the underlying object. 1181573Srgrimes */ 11982709Sache if ((pos -= (HASUB(fp) ? fp->_ur : fp->_r)) < 0) { 12082734Sache fp->_flags |= __SERR; 12182734Sache errno = EIO; 12282734Sache return (1); 12382588Sache } 12482709Sache if (HASUB(fp)) 12582709Sache pos -= fp->_r; /* Can be negative at this point. */ 126290544Sache } else if ((fp->_flags & __SWR) && fp->_p != NULL && 127290544Sache (n = fp->_p - fp->_bf._base) > 0) { 1281573Srgrimes /* 1291573Srgrimes * Writing. Any buffered characters cause the 1301573Srgrimes * position to be greater than that in the 1311573Srgrimes * underlying object. 1321573Srgrimes */ 13382588Sache if (pos > OFF_MAX - n) { 13482588Sache errno = EOVERFLOW; 13582709Sache return (1); 13682588Sache } 13782588Sache pos += n; 1381573Srgrimes } 13982709Sache *offset = pos; 14082709Sache return (0); 1411573Srgrimes} 142