gno/lib/libc/stdio/funopen.c
1997-09-05 06:27:50 +00:00

84 lines
2.9 KiB
C

/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef __ORCAC__
segment "libc_stdio";
#endif
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)funopen.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <stdio.h>
#include <errno.h>
#include "local.h"
typedef ssize_t (*readfn_t)(void *, char *, size_t);
typedef ssize_t (*writefn_t)(void *, const char *, size_t);
typedef fpos_t (*seekfn_t)(void *cookie, fpos_t off, int whence);
typedef int (*closefn_t)(void *);
FILE *
funopen(const void *cookie, readfn_t readfn, writefn_t writefn, seekfn_t
seekfn, closefn_t closefn)
{
register FILE *fp;
int flags;
if (readfn == NULL) {
if (writefn == NULL) { /* illegal */
errno = EINVAL;
return (NULL);
} else
flags = __SWR; /* write only */
} else {
if (writefn == NULL)
flags = __SRD; /* read only */
else
flags = __SRW; /* read-write */
}
if ((fp = __sfp()) == NULL)
return (NULL);
fp->_flags = flags;
fp->_file = -1;
fp->_cookie = (void *)cookie;
fp->_read = readfn;
fp->_write = writefn;
fp->_seek = seekfn;
fp->_close = closefn;
return (fp);
}