funopen.c revision 92986
11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1990, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * This code is derived from software contributed to Berkeley by 61573Srgrimes * Chris Torek. 71573Srgrimes * 81573Srgrimes * Redistribution and use in source and binary forms, with or without 91573Srgrimes * modification, are permitted provided that the following conditions 101573Srgrimes * are met: 111573Srgrimes * 1. Redistributions of source code must retain the above copyright 121573Srgrimes * notice, this list of conditions and the following disclaimer. 131573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141573Srgrimes * notice, this list of conditions and the following disclaimer in the 151573Srgrimes * documentation and/or other materials provided with the distribution. 161573Srgrimes * 3. All advertising materials mentioning features or use of this software 171573Srgrimes * must display the following acknowledgement: 181573Srgrimes * This product includes software developed by the University of 191573Srgrimes * California, Berkeley and its contributors. 201573Srgrimes * 4. Neither the name of the University nor the names of its contributors 211573Srgrimes * may be used to endorse or promote products derived from this software 221573Srgrimes * without specific prior written permission. 231573Srgrimes * 241573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341573Srgrimes * SUCH DAMAGE. 351573Srgrimes */ 361573Srgrimes 371573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 381573Srgrimesstatic char sccsid[] = "@(#)funopen.c 8.1 (Berkeley) 6/4/93"; 391573Srgrimes#endif /* LIBC_SCCS and not lint */ 4092986Sobrien#include <sys/cdefs.h> 4192986Sobrien__FBSDID("$FreeBSD: head/lib/libc/stdio/funopen.c 92986 2002-03-22 21:53:29Z obrien $"); 421573Srgrimes 431573Srgrimes#include <stdio.h> 441573Srgrimes#include <errno.h> 4571579Sdeischen 461573Srgrimes#include "local.h" 471573Srgrimes 481573SrgrimesFILE * 491573Srgrimesfunopen(cookie, readfn, writefn, seekfn, closefn) 501573Srgrimes const void *cookie; 511573Srgrimes int (*readfn)(), (*writefn)(); 521573Srgrimes#if __STDC__ 531573Srgrimes fpos_t (*seekfn)(void *cookie, fpos_t off, int whence); 541573Srgrimes#else 551573Srgrimes fpos_t (*seekfn)(); 561573Srgrimes#endif 571573Srgrimes int (*closefn)(); 581573Srgrimes{ 5992889Sobrien FILE *fp; 601573Srgrimes int flags; 611573Srgrimes 621573Srgrimes if (readfn == NULL) { 631573Srgrimes if (writefn == NULL) { /* illegal */ 641573Srgrimes errno = EINVAL; 651573Srgrimes return (NULL); 661573Srgrimes } else 671573Srgrimes flags = __SWR; /* write only */ 681573Srgrimes } else { 691573Srgrimes if (writefn == NULL) 701573Srgrimes flags = __SRD; /* read only */ 711573Srgrimes else 721573Srgrimes flags = __SRW; /* read-write */ 731573Srgrimes } 741573Srgrimes if ((fp = __sfp()) == NULL) 751573Srgrimes return (NULL); 761573Srgrimes fp->_flags = flags; 771573Srgrimes fp->_file = -1; 781573Srgrimes fp->_cookie = (void *)cookie; 791573Srgrimes fp->_read = readfn; 801573Srgrimes fp->_write = writefn; 811573Srgrimes fp->_seek = seekfn; 821573Srgrimes fp->_close = closefn; 831573Srgrimes return (fp); 841573Srgrimes} 85