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 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char sccsid[] = "@(#)funopen.c 8.1 (Berkeley) 6/4/93"; 35 #endif /* LIBC_SCCS and not lint */ 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <stdio.h> 40 #include <errno.h> 41 42 #include "local.h" 43 44 FILE * 45 funopen(const void *cookie, 46 int (*readfn)(void *, char *, int), 47 int (*writefn)(void *, const char *, int), 48 fpos_t (*seekfn)(void *, fpos_t, int), 49 int (*closefn)(void *)) 50 { 51 FILE *fp; 52 int flags; 53 54 if (readfn == NULL) { 55 if (writefn == NULL) { /* illegal */ 56 errno = EINVAL; 57 return (NULL); 58 } else 59 flags = __SWR; /* write only */ 60 } else { 61 if (writefn == NULL) 62 flags = __SRD; /* read only */ 63 else 64 flags = __SRW; /* read-write */ 65 } 66 if ((fp = __sfp()) == NULL) 67 return (NULL); 68 fp->_flags = flags; 69 fp->_file = -1; 70 fp->_cookie = (void *)cookie; 71 fp->_read = readfn; 72 fp->_write = writefn; 73 fp->_seek = seekfn; 74 fp->_close = closefn; 75 return (fp); 76 } 77
