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      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 (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 /*
     33  * Return file offset.
     34  * Coordinates with buffering.
     35  */
     36 
     37 #include <sys/feature_tests.h>
     38 
     39 #if !defined(_LP64)
     40 #pragma weak _ftello64 = ftello64
     41 #endif
     42 #pragma weak _ftello = ftello
     43 
     44 #include "lint.h"
     45 #include "file64.h"
     46 #include "mtlib.h"
     47 #include <sys/types.h>
     48 #include <unistd.h>
     49 #include <stdio.h>
     50 #include <thread.h>
     51 #include <synch.h>
     52 #include <errno.h>
     53 #include <limits.h>
     54 #include <fcntl.h>
     55 #include <stddef.h>
     56 #include "stdiom.h"
     57 
     58 #if !defined(_LP64)
     59 
     60 off64_t
     61 ftello64(FILE *iop)
     62 {
     63 	ptrdiff_t adjust;
     64 	off64_t	tres;
     65 	rmutex_t *lk;
     66 
     67 	FLOCKFILE(lk, iop);
     68 	if (iop->_cnt < 0)
     69 		iop->_cnt = 0;
     70 	if (iop->_flag & _IOREAD)
     71 		adjust = (ptrdiff_t)-iop->_cnt;
     72 	else if (iop->_flag & (_IOWRT | _IORW)) {
     73 		adjust = 0;
     74 		if (((iop->_flag & (_IOWRT | _IONBF)) == _IOWRT) &&
     75 		    (iop->_base != 0))
     76 			adjust = iop->_ptr - iop->_base;
     77 	} else {
     78 		errno = EBADF;	/* file descriptor refers to no open file */
     79 		FUNLOCKFILE(lk);
     80 		return ((off64_t)EOF);
     81 	}
     82 	tres = lseek64(FILENO(iop), 0, SEEK_CUR);
     83 	if (tres >= 0)
     84 		tres += (off64_t)adjust;
     85 	FUNLOCKFILE(lk);
     86 	return (tres);
     87 }
     88 
     89 #endif	/* _LP64 */
     90 
     91 off_t
     92 ftello(FILE *iop)
     93 {
     94 	return ((off_t)ftell(iop));
     95 }
     96