179 lines
4.2 KiB
C
179 lines
4.2 KiB
C
/*-
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 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)
|
|
#if 0
|
|
static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93";
|
|
#endif
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include "namespace.h"
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include "un-namespace.h"
|
|
#include "local.h"
|
|
|
|
/*
|
|
* Small standard I/O/seek/close functions.
|
|
*/
|
|
int
|
|
__sread(cookie, buf, n)
|
|
void *cookie;
|
|
char *buf;
|
|
int n;
|
|
{
|
|
register FILE *fp = cookie;
|
|
|
|
return(_read(fp->_file, buf, (size_t)n));
|
|
}
|
|
|
|
int
|
|
__swrite(cookie, buf, n)
|
|
void *cookie;
|
|
char const *buf;
|
|
int n;
|
|
{
|
|
register FILE *fp = cookie;
|
|
|
|
return (_write(fp->_file, buf, (size_t)n));
|
|
}
|
|
|
|
fpos_t
|
|
__sseek(cookie, offset, whence)
|
|
void *cookie;
|
|
fpos_t offset;
|
|
int whence;
|
|
{
|
|
register FILE *fp = cookie;
|
|
|
|
return (lseek(fp->_file, (off_t)offset, whence));
|
|
}
|
|
|
|
int
|
|
__sclose(cookie)
|
|
void *cookie;
|
|
{
|
|
|
|
return (_close(((FILE *)cookie)->_file));
|
|
}
|
|
|
|
/*
|
|
* Higher level wrappers.
|
|
*/
|
|
int
|
|
_sread(fp, buf, n)
|
|
FILE *fp;
|
|
char *buf;
|
|
int n;
|
|
{
|
|
int ret;
|
|
|
|
ret = (*fp->_read)(fp->_cookie, buf, n);
|
|
if (ret > 0) {
|
|
if (fp->_flags & __SOFF) {
|
|
if (fp->_offset <= OFF_MAX - ret)
|
|
fp->_offset += ret;
|
|
else
|
|
fp->_flags &= ~__SOFF;
|
|
}
|
|
} else if (ret < 0)
|
|
fp->_flags &= ~__SOFF;
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
_swrite(fp, buf, n)
|
|
FILE *fp;
|
|
char const *buf;
|
|
int n;
|
|
{
|
|
int ret;
|
|
|
|
if ((fp->_flags & __SAPP) && _sseek(fp, (fpos_t)0, SEEK_END) == -1)
|
|
return (-1);
|
|
ret = (*fp->_write)(fp->_cookie, buf, n);
|
|
/* __SOFF removed even on success in case O_APPEND mode is set. */
|
|
if (ret >= 0) {
|
|
if ((fp->_flags & (__SAPP|__SOFF)) == (__SAPP|__SOFF) &&
|
|
fp->_offset <= OFF_MAX - ret)
|
|
fp->_offset += ret;
|
|
else
|
|
fp->_flags &= ~__SOFF;
|
|
|
|
} else if (ret < 0)
|
|
fp->_flags &= ~__SOFF;
|
|
return (ret);
|
|
}
|
|
|
|
fpos_t
|
|
_sseek(fp, offset, whence)
|
|
FILE *fp;
|
|
fpos_t offset;
|
|
int whence;
|
|
{
|
|
fpos_t ret;
|
|
int serrno, errret;
|
|
|
|
serrno = errno;
|
|
errno = 0;
|
|
ret = (*fp->_seek)(fp->_cookie, offset, whence);
|
|
errret = errno;
|
|
if (errno == 0)
|
|
errno = serrno;
|
|
/*
|
|
* Disallow negative seeks per POSIX.
|
|
* It is needed here to help upper level caller
|
|
* in the cases it can't detect.
|
|
*/
|
|
if (ret < 0) {
|
|
if (errret == 0) {
|
|
fp->_flags |= __SERR;
|
|
errno = EINVAL;
|
|
}
|
|
fp->_flags &= ~__SOFF;
|
|
ret = -1;
|
|
} else if (fp->_flags & __SOPT) {
|
|
fp->_flags |= __SOFF;
|
|
fp->_offset = ret;
|
|
}
|
|
return (ret);
|
|
}
|