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funopen.c revision 1.8
      1  1.8   thorpej /*	$NetBSD: funopen.c,v 1.8 2003/01/18 11:29:54 thorpej Exp $	*/
      2  1.4       jtc 
      3  1.1       cgd /*-
      4  1.4       jtc  * Copyright (c) 1990, 1993
      5  1.4       jtc  *	The Regents of the University of California.  All rights reserved.
      6  1.1       cgd  *
      7  1.1       cgd  * This code is derived from software contributed to Berkeley by
      8  1.1       cgd  * Chris Torek.
      9  1.1       cgd  *
     10  1.1       cgd  * Redistribution and use in source and binary forms, with or without
     11  1.1       cgd  * modification, are permitted provided that the following conditions
     12  1.1       cgd  * are met:
     13  1.1       cgd  * 1. Redistributions of source code must retain the above copyright
     14  1.1       cgd  *    notice, this list of conditions and the following disclaimer.
     15  1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
     17  1.1       cgd  *    documentation and/or other materials provided with the distribution.
     18  1.1       cgd  * 3. All advertising materials mentioning features or use of this software
     19  1.1       cgd  *    must display the following acknowledgement:
     20  1.1       cgd  *	This product includes software developed by the University of
     21  1.1       cgd  *	California, Berkeley and its contributors.
     22  1.1       cgd  * 4. Neither the name of the University nor the names of its contributors
     23  1.1       cgd  *    may be used to endorse or promote products derived from this software
     24  1.1       cgd  *    without specific prior written permission.
     25  1.1       cgd  *
     26  1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  1.1       cgd  * SUCH DAMAGE.
     37  1.1       cgd  */
     38  1.1       cgd 
     39  1.5  christos #include <sys/cdefs.h>
     40  1.1       cgd #if defined(LIBC_SCCS) && !defined(lint)
     41  1.4       jtc #if 0
     42  1.4       jtc static char sccsid[] = "@(#)funopen.c	8.1 (Berkeley) 6/4/93";
     43  1.5  christos #else
     44  1.8   thorpej __RCSID("$NetBSD: funopen.c,v 1.8 2003/01/18 11:29:54 thorpej Exp $");
     45  1.4       jtc #endif
     46  1.1       cgd #endif /* LIBC_SCCS and not lint */
     47  1.1       cgd 
     48  1.1       cgd #include <stdio.h>
     49  1.1       cgd #include <errno.h>
     50  1.8   thorpej #include "reentrant.h"
     51  1.1       cgd #include "local.h"
     52  1.1       cgd 
     53  1.1       cgd FILE *
     54  1.1       cgd funopen(cookie, readfn, writefn, seekfn, closefn)
     55  1.1       cgd 	const void *cookie;
     56  1.5  christos 	int (*readfn) __P((void *, char *, int));
     57  1.5  christos 	int (*writefn) __P((void *, const char *, int));
     58  1.5  christos 	fpos_t (*seekfn) __P((void *, fpos_t, int));
     59  1.5  christos 	int (*closefn) __P((void *));
     60  1.1       cgd {
     61  1.6     perry 	FILE *fp;
     62  1.1       cgd 	int flags;
     63  1.1       cgd 
     64  1.1       cgd 	if (readfn == NULL) {
     65  1.1       cgd 		if (writefn == NULL) {		/* illegal */
     66  1.1       cgd 			errno = EINVAL;
     67  1.1       cgd 			return (NULL);
     68  1.1       cgd 		} else
     69  1.1       cgd 			flags = __SWR;		/* write only */
     70  1.1       cgd 	} else {
     71  1.1       cgd 		if (writefn == NULL)
     72  1.1       cgd 			flags = __SRD;		/* read only */
     73  1.1       cgd 		else
     74  1.1       cgd 			flags = __SRW;		/* read-write */
     75  1.1       cgd 	}
     76  1.1       cgd 	if ((fp = __sfp()) == NULL)
     77  1.1       cgd 		return (NULL);
     78  1.1       cgd 	fp->_flags = flags;
     79  1.1       cgd 	fp->_file = -1;
     80  1.7  christos 	/* LINTED we don't play with cookie */
     81  1.1       cgd 	fp->_cookie = (void *)cookie;
     82  1.1       cgd 	fp->_read = readfn;
     83  1.1       cgd 	fp->_write = writefn;
     84  1.1       cgd 	fp->_seek = seekfn;
     85  1.1       cgd 	fp->_close = closefn;
     86  1.1       cgd 	return (fp);
     87  1.1       cgd }
     88