1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $FreeBSD: src/lib/libc/stdio/funopen.c,v 1.1.1.1.14.1 2001/03/05 10:57:52 obrien Exp $ 37 */ 38 39 #if defined(LIBC_SCCS) && !defined(lint) 40 static char sccsid[] = "@(#)funopen.c 8.1 (Berkeley) 6/4/93"; 41 #endif /* LIBC_SCCS and not lint */ 42 43 #include <stdio.h> 44 #include <errno.h> 45 46 #include "local.h" 47 48 FILE * 49 funopen(cookie, readfn, writefn, seekfn, closefn) 50 const void *cookie; 51 int (*readfn)(), (*writefn)(); 52 #if __STDC__ 53 fpos_t (*seekfn)(void *cookie, fpos_t off, int whence); 54 #else 55 fpos_t (*seekfn)(); 56 #endif 57 int (*closefn)(); 58 { 59 register FILE *fp; 60 int flags; 61 62 if (readfn == NULL) { 63 if (writefn == NULL) { /* illegal */ 64 errno = EINVAL; 65 return (NULL); 66 } else 67 flags = __SWR; /* write only */ 68 } else { 69 if (writefn == NULL) 70 flags = __SRD; /* read only */ 71 else 72 flags = __SRW; /* read-write */ 73 } 74 if ((fp = __sfp()) == NULL) 75 return (NULL); 76 fp->_flags = flags; 77 fp->_file = -1; 78 fp->_cookie = (void *)cookie; 79 fp->_read = readfn; 80 fp->_write = writefn; 81 fp->_seek = seekfn; 82 fp->_close = closefn; 83 return (fp); 84 } 85