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funopen.c revision 1.4 
      1 /*	$NetBSD: funopen.c,v 1.4 1995/02/02 02:09:44 jtc 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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #if defined(LIBC_SCCS) && !defined(lint)
     40 #if 0
     41 static char sccsid[] = "@(#)funopen.c	8.1 (Berkeley) 6/4/93";
     42 #endif
     43 static char rcsid[] = "$NetBSD: funopen.c,v 1.4 1995/02/02 02:09:44 jtc Exp $";
     44 #endif /* LIBC_SCCS and not lint */
     45 
     46 #include <stdio.h>
     47 #include <errno.h>
     48 #include "local.h"
     49 
     50 FILE *
     51 funopen(cookie, readfn, writefn, seekfn, closefn)
     52 	const void *cookie;
     53 	int (*readfn)(), (*writefn)();
     54 #if __STDC__
     55 	fpos_t (*seekfn)(void *cookie, fpos_t off, int whence);
     56 #else
     57 	fpos_t (*seekfn)();
     58 #endif
     59 	int (*closefn)();
     60 {
     61 	register FILE *fp;
     62 	int flags;
     63 
     64 	if (readfn == NULL) {
     65 		if (writefn == NULL) {		/* illegal */
     66 			errno = EINVAL;
     67 			return (NULL);
     68 		} else
     69 			flags = __SWR;		/* write only */
     70 	} else {
     71 		if (writefn == NULL)
     72 			flags = __SRD;		/* read only */
     73 		else
     74 			flags = __SRW;		/* read-write */
     75 	}
     76 	if ((fp = __sfp()) == NULL)
     77 		return (NULL);
     78 	fp->_flags = flags;
     79 	fp->_file = -1;
     80 	fp->_cookie = (void *)cookie;
     81 	fp->_read = readfn;
     82 	fp->_write = writefn;
     83 	fp->_seek = seekfn;
     84 	fp->_close = closefn;
     85 	return (fp);
     86 }
     87