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funopen.c revision 1.12 
      1 /*	$NetBSD: funopen.c,v 1.12 2012/03/15 18:22:30 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Chris Torek.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)funopen.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 __RCSID("$NetBSD: funopen.c,v 1.12 2012/03/15 18:22:30 christos Exp $");
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include <stdio.h>
     45 #include <errno.h>
     46 #include "reentrant.h"
     47 #include "local.h"
     48 
     49 FILE *
     50 funopen(const void *cookie,
     51     int (*readfn)(void *, char *, int),
     52     int (*writefn)(void *, const char *, int),
     53     off_t (*seekfn)(void *, off_t, int),
     54     int (*closefn)(void *))
     55 {
     56 	FILE *fp;
     57 	int flags;
     58 
     59 	if (readfn == NULL) {
     60 		if (writefn == NULL) {		/* illegal */
     61 			errno = EINVAL;
     62 			return NULL;
     63 		} else
     64 			flags = __SWR;		/* write only */
     65 	} else {
     66 		if (writefn == NULL)
     67 			flags = __SRD;		/* read only */
     68 		else
     69 			flags = __SRW;		/* read-write */
     70 	}
     71 	if ((fp = __sfp()) == NULL)
     72 		return NULL;
     73 	fp->_flags = flags;
     74 	fp->_file = -1;
     75 	fp->_cookie = __UNCONST(cookie);
     76 	fp->_read = readfn;
     77 	fp->_write = writefn;
     78 	fp->_seek = seekfn;
     79 	fp->_close = closefn;
     80 	return fp;
     81 }
     82