1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 <stdio.h> 36 #include <errno.h> 37 38 #include "local.h" 39 40 FILE * 41 funopen(const void *cookie, 42 int (*readfn)(void *, char *, int), 43 int (*writefn)(void *, const char *, int), 44 fpos_t (*seekfn)(void *, fpos_t, int), 45 int (*closefn)(void *)) 46 { 47 FILE *fp; 48 int flags; 49 50 if (readfn == NULL) { 51 if (writefn == NULL) { /* illegal */ 52 errno = EINVAL; 53 return (NULL); 54 } else 55 flags = __SWR; /* write only */ 56 } else { 57 if (writefn == NULL) 58 flags = __SRD; /* read only */ 59 else 60 flags = __SRW; /* read-write */ 61 } 62 if ((fp = __sfp()) == NULL) 63 return (NULL); 64 fp->_flags = flags; 65 fp->_file = -1; 66 fp->_cookie = (void *)cookie; 67 fp->_read = readfn; 68 fp->_write = writefn; 69 fp->_seek = seekfn; 70 fp->_close = closefn; 71 return (fp); 72 } 73