69 lines
2.5 KiB
C
69 lines
2.5 KiB
C
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/* $OpenBSD: funopen.c,v 1.8 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 <stdio.h>
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#include <errno.h>
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#include "local.h"
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FILE *
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funopen(const void *cookie, int (*readfn)(void *, char *, int),
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int (*writefn)(void *, const char *, int),
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fpos_t (*seekfn)(void *, fpos_t, int), int (*closefn)(void *))
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{
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FILE *fp;
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int flags;
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if (readfn == NULL) {
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if (writefn == NULL) { /* illegal */
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errno = EINVAL;
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return (NULL);
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} else
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flags = __SWR; /* write only */
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} else {
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if (writefn == NULL)
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flags = __SRD; /* read only */
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else
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flags = __SRW; /* read-write */
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}
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if ((fp = __sfp()) == NULL)
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return (NULL);
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fp->_flags = flags;
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fp->_file = -1;
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fp->_cookie = (void *)cookie; /* SAFE: cookie not modified */
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fp->_read = readfn;
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fp->_write = writefn;
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fp->_seek = seekfn;
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fp->_close = closefn;
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return (fp);
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}
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