169 lines
4.1 KiB
C
169 lines
4.1 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. 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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static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <stdlib.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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*/
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int
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__sread(void *cookie, char *buf, int n)
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{
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FILE *fp = cookie;
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return(_read(fp->_file, buf, (size_t)n));
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}
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int
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__swrite(void *cookie, char const *buf, int n)
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{
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FILE *fp = cookie;
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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(void *cookie, fpos_t offset, int whence)
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{
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FILE *fp = cookie;
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return (lseek(fp->_file, (off_t)offset, whence));
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}
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int
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__sclose(void *cookie)
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{
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return (_close(((FILE *)cookie)->_file));
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}
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/*
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* Higher level wrappers.
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*/
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int
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_sread(FILE *fp, char *buf, int n)
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{
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int ret;
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ret = (*fp->_read)(fp->_cookie, buf, n);
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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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fp->_offset += ret;
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else
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fp->_flags &= ~__SOFF;
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}
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} else if (ret < 0)
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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(FILE *fp, char const *buf, int n)
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{
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int ret;
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int serrno;
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if (fp->_flags & __SAPP) {
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serrno = errno;
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if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 &&
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(fp->_flags & __SOPT))
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return (-1);
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errno = serrno;
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}
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ret = (*fp->_write)(fp->_cookie, buf, n);
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/* __SOFF removed even on success in case O_APPEND mode is set. */
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if (ret >= 0) {
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if ((fp->_flags & (__SAPP|__SOFF)) == (__SAPP|__SOFF) &&
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fp->_offset <= OFF_MAX - ret)
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fp->_offset += ret;
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else
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fp->_flags &= ~__SOFF;
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} else if (ret < 0)
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fp->_flags &= ~__SOFF;
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return (ret);
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}
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fpos_t
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_sseek(FILE *fp, fpos_t offset, int whence)
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{
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fpos_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 = (*fp->_seek)(fp->_cookie, 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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* 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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if (offset != 0 || whence != SEEK_CUR) {
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if (HASUB(fp))
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FREEUB(fp);
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fp->_p = fp->_bf._base;
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fp->_r = 0;
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fp->_flags &= ~__SEOF;
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}
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fp->_flags |= __SERR;
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errno = EINVAL;
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} else if (errret == ESPIPE)
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fp->_flags &= ~__SAPP;
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fp->_flags &= ~__SOFF;
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ret = -1;
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} else if (fp->_flags & __SOPT) {
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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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