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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)funopen.c 8.1 (Berkeley) 6/4/93 33 * $FreeBSD: src/lib/libc/stdio/funopen.c,v 1.6 2007/01/09 00:28:06 imp Exp $ 34 */ 35 36 #include <stdio.h> 37 #include <errno.h> 38 39 #include "local.h" 40 41 FILE * 42 funopen(const void *cookie, int (*readfn)(void *, char *, int), 43 int (*writefn)(void *, const char *, int), 44 fpos_t (*seekfn)(void *, fpos_t, int), int (*closefn)(void *)) 45 { 46 FILE *fp; 47 int flags; 48 49 if (readfn == NULL) { 50 if (writefn == NULL) { /* illegal */ 51 errno = EINVAL; 52 return (NULL); 53 } else 54 flags = __SWR; /* write only */ 55 } else { 56 if (writefn == NULL) 57 flags = __SRD; /* read only */ 58 else 59 flags = __SRW; /* read-write */ 60 } 61 if ((fp = __sfp()) == NULL) 62 return (NULL); 63 fp->pub._flags = flags; 64 fp->pub._fileno = -1; 65 fp->_cookie = (void *)cookie; 66 fp->_read = readfn; 67 fp->_write = writefn; 68 fp->_seek = seekfn; 69 fp->_close = closefn; 70 return (fp); 71 } 72