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84 lines
2.9 KiB
C
84 lines
2.9 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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#ifdef __ORCAC__
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segment "libc_stdio";
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#endif
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)funopen.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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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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typedef ssize_t (*readfn_t)(void *, char *, size_t);
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typedef ssize_t (*writefn_t)(void *, const char *, size_t);
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typedef fpos_t (*seekfn_t)(void *cookie, fpos_t off, int whence);
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typedef int (*closefn_t)(void *);
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FILE *
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funopen(const void *cookie, readfn_t readfn, writefn_t writefn, seekfn_t
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seekfn, closefn_t closefn)
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{
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register 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;
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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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