90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/* $OpenBSD: stdio.c,v 1.9 2005/08/08 08:05:36 espie Exp $ */
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/*-
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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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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.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(void *cookie, char *buf, int n)
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{
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FILE *fp = cookie;
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int ret;
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ret = TEMP_FAILURE_RETRY(read(fp->_file, buf, n));
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/* if the read succeeded, update the current offset */
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if (ret >= 0)
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fp->_offset += ret;
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else
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fp->_flags &= ~__SOFF; /* paranoia */
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return (ret);
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}
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int
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__swrite(void *cookie, const char *buf, int n)
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{
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FILE *fp = cookie;
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if (fp->_flags & __SAPP)
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(void) TEMP_FAILURE_RETRY(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 TEMP_FAILURE_RETRY(write(fp->_file, buf, 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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off_t ret;
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ret = TEMP_FAILURE_RETRY(lseek(fp->_file, (off_t)offset, whence));
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if (ret == (off_t)-1)
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fp->_flags &= ~__SOFF;
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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(void *cookie)
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{
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return close(((FILE *)cookie)->_file);
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}
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