1994-05-27 05:00:24 +00:00
|
|
|
/*-
|
|
|
|
* Copyright (c) 1990, 1993
|
|
|
|
* The Regents of the University of California. All rights reserved.
|
|
|
|
*
|
|
|
|
* This code is derived from software contributed to Berkeley by
|
|
|
|
* Chris Torek.
|
|
|
|
*
|
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
|
|
* modification, are permitted provided that the following conditions
|
|
|
|
* are met:
|
|
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer.
|
|
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
|
|
* documentation and/or other materials provided with the distribution.
|
|
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
|
|
* may be used to endorse or promote products derived from this software
|
|
|
|
* without specific prior written permission.
|
|
|
|
*
|
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
* SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
1997-03-11 11:40:40 +00:00
|
|
|
static char sccsid[] = "@(#)ftell.c 8.2 (Berkeley) 5/4/95";
|
1994-05-27 05:00:24 +00:00
|
|
|
#endif /* LIBC_SCCS and not lint */
|
2002-03-22 21:53:29 +00:00
|
|
|
#include <sys/cdefs.h>
|
|
|
|
__FBSDID("$FreeBSD$");
|
1994-05-27 05:00:24 +00:00
|
|
|
|
2001-01-24 13:01:12 +00:00
|
|
|
#include "namespace.h"
|
1999-02-08 21:32:38 +00:00
|
|
|
#include <sys/types.h>
|
1994-05-27 05:00:24 +00:00
|
|
|
#include <errno.h>
|
2001-08-30 19:54:04 +00:00
|
|
|
#include <limits.h>
|
|
|
|
#include <stdio.h>
|
2001-01-24 13:01:12 +00:00
|
|
|
#include "un-namespace.h"
|
1994-05-27 05:00:24 +00:00
|
|
|
#include "local.h"
|
1998-04-11 07:40:47 +00:00
|
|
|
#include "libc_private.h"
|
1994-05-27 05:00:24 +00:00
|
|
|
|
|
|
|
/*
|
1999-02-08 21:32:38 +00:00
|
|
|
* standard ftell function.
|
1994-05-27 05:00:24 +00:00
|
|
|
*/
|
|
|
|
long
|
|
|
|
ftell(fp)
|
2002-03-21 18:49:23 +00:00
|
|
|
FILE *fp;
|
1999-02-08 21:32:38 +00:00
|
|
|
{
|
2002-03-21 18:49:23 +00:00
|
|
|
off_t rv;
|
2001-08-30 19:54:04 +00:00
|
|
|
|
1999-02-08 21:32:38 +00:00
|
|
|
rv = ftello(fp);
|
2001-08-30 19:54:04 +00:00
|
|
|
if (rv > LONG_MAX) {
|
1999-02-08 21:32:38 +00:00
|
|
|
errno = EOVERFLOW;
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
return (rv);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ftello: return current offset.
|
|
|
|
*/
|
|
|
|
off_t
|
|
|
|
ftello(fp)
|
2002-03-21 18:49:23 +00:00
|
|
|
FILE *fp;
|
2001-08-31 18:23:29 +00:00
|
|
|
{
|
2001-09-01 01:56:54 +00:00
|
|
|
fpos_t rv;
|
|
|
|
int ret;
|
2001-08-31 18:23:29 +00:00
|
|
|
|
|
|
|
FLOCKFILE(fp);
|
2001-09-01 01:56:54 +00:00
|
|
|
ret = _ftello(fp, &rv);
|
2001-08-31 18:23:29 +00:00
|
|
|
FUNLOCKFILE(fp);
|
2001-09-01 01:56:54 +00:00
|
|
|
if (ret)
|
|
|
|
return (-1);
|
2001-09-01 12:13:33 +00:00
|
|
|
if (rv < 0) { /* Unspecified value because of ungetc() at 0 */
|
|
|
|
errno = ESPIPE;
|
|
|
|
return (-1);
|
|
|
|
}
|
2001-08-31 18:23:29 +00:00
|
|
|
return (rv);
|
|
|
|
}
|
|
|
|
|
2001-09-01 01:56:54 +00:00
|
|
|
int
|
|
|
|
_ftello(fp, offset)
|
2002-03-21 18:49:23 +00:00
|
|
|
FILE *fp;
|
2001-09-01 01:56:54 +00:00
|
|
|
fpos_t *offset;
|
1994-05-27 05:00:24 +00:00
|
|
|
{
|
2002-03-21 18:49:23 +00:00
|
|
|
fpos_t pos;
|
2001-08-30 19:54:04 +00:00
|
|
|
size_t n;
|
1994-05-27 05:00:24 +00:00
|
|
|
|
|
|
|
if (fp->_seek == NULL) {
|
|
|
|
errno = ESPIPE; /* historic practice */
|
2001-09-01 01:56:54 +00:00
|
|
|
return (1);
|
1994-05-27 05:00:24 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Find offset of underlying I/O object, then
|
|
|
|
* adjust for buffered bytes.
|
|
|
|
*/
|
2001-09-01 11:18:53 +00:00
|
|
|
if (fp->_flags & __SOFF)
|
1994-05-27 05:00:24 +00:00
|
|
|
pos = fp->_offset;
|
2001-09-01 11:18:53 +00:00
|
|
|
else {
|
2001-09-02 19:10:10 +00:00
|
|
|
pos = _sseek(fp, (fpos_t)0, SEEK_CUR);
|
2001-08-31 18:23:29 +00:00
|
|
|
if (pos == -1)
|
2001-09-01 01:56:54 +00:00
|
|
|
return (1);
|
1994-05-27 05:00:24 +00:00
|
|
|
}
|
|
|
|
if (fp->_flags & __SRD) {
|
|
|
|
/*
|
|
|
|
* Reading. Any unread characters (including
|
|
|
|
* those from ungetc) cause the position to be
|
|
|
|
* smaller than that in the underlying object.
|
|
|
|
*/
|
2001-09-01 01:56:54 +00:00
|
|
|
if ((pos -= (HASUB(fp) ? fp->_ur : fp->_r)) < 0) {
|
2001-09-01 11:18:53 +00:00
|
|
|
fp->_flags |= __SERR;
|
|
|
|
errno = EIO;
|
|
|
|
return (1);
|
2001-08-30 19:54:04 +00:00
|
|
|
}
|
2001-09-01 01:56:54 +00:00
|
|
|
if (HASUB(fp))
|
|
|
|
pos -= fp->_r; /* Can be negative at this point. */
|
2001-08-30 19:54:04 +00:00
|
|
|
} else if ((fp->_flags & __SWR) && fp->_p != NULL) {
|
1994-05-27 05:00:24 +00:00
|
|
|
/*
|
|
|
|
* Writing. Any buffered characters cause the
|
|
|
|
* position to be greater than that in the
|
|
|
|
* underlying object.
|
|
|
|
*/
|
2001-08-30 19:54:04 +00:00
|
|
|
n = fp->_p - fp->_bf._base;
|
|
|
|
if (pos > OFF_MAX - n) {
|
|
|
|
errno = EOVERFLOW;
|
2001-09-01 01:56:54 +00:00
|
|
|
return (1);
|
2001-08-30 19:54:04 +00:00
|
|
|
}
|
|
|
|
pos += n;
|
1994-05-27 05:00:24 +00:00
|
|
|
}
|
2001-09-01 01:56:54 +00:00
|
|
|
*offset = pos;
|
|
|
|
return (0);
|
1994-05-27 05:00:24 +00:00
|
|
|
}
|