141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "un-namespace.h"
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#include "local.h"
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/*
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* Small standard I/O/seek/close functions.
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* These maintain the `known seek offset' for seek optimisation.
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*/
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int
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__sread(cookie, buf, n)
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void *cookie;
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char *buf;
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int n;
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{
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register FILE *fp = cookie;
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register int ret;
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ret = _read(fp->_file, buf, (size_t)n);
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/* if the read succeeded, update the current offset */
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if (ret >= 0) {
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if (fp->_flags & __SOFF) {
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if (fp->_offset > OFF_MAX - ret) {
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errno = EOVERFLOW;
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ret = -1;
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} else {
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fp->_offset += ret;
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return (ret);
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}
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} else
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return (ret);
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}
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fp->_flags &= ~__SOFF;
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return (ret);
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}
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int
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__swrite(cookie, buf, n)
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void *cookie;
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char const *buf;
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int n;
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{
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register FILE *fp = cookie;
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if (fp->_flags & __SAPP)
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(void) lseek(fp->_file, (off_t)0, SEEK_END);
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fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */
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return (_write(fp->_file, buf, (size_t)n));
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}
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fpos_t
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__sseek(cookie, offset, whence)
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void *cookie;
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fpos_t offset;
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int whence;
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{
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register FILE *fp = cookie;
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register off_t ret;
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int serrno, errret;
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serrno = errno;
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errno = 0;
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ret = lseek(fp->_file, (off_t)offset, whence);
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errret = errno;
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if (errno == 0)
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errno = serrno;
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/*
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* Disallow negative seeks per POSIX.
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* It is needed here to help upper level caller
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* (fseek) in the cases it can't detect.
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*/
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if (ret < 0) {
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if (errret == 0) {
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fp->_flags |= __SERR;
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errno = EINVAL;
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}
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fp->_flags &= ~__SOFF;
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ret = -1;
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} else {
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fp->_flags |= __SOFF;
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fp->_offset = ret;
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}
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return (ret);
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}
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int
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__sclose(cookie)
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void *cookie;
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{
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return (_close(((FILE *)cookie)->_file));
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}
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