1 /* $OpenBSD: funopen.c,v 1.8 2005/08/08 08:05:36 espie Exp $ */ 2 /*- 3 * Copyright (c) 1990, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Chris Torek. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <stdio.h> 35 #include <errno.h> 36 #include "local.h" 37 38 FILE * funopen(const void * cookie,int (* readfn)(void *,char *,int),int (* writefn)(void *,const char *,int),fpos_t (* seekfn)(void *,fpos_t,int),int (* closefn)(void *))39 funopen(const void *cookie, int (*readfn)(void *, char *, int), 40 int (*writefn)(void *, const char *, int), 41 fpos_t (*seekfn)(void *, fpos_t, int), int (*closefn)(void *)) 42 { 43 FILE *fp; 44 int flags; 45 46 if (readfn == NULL) { 47 if (writefn == NULL) { /* illegal */ 48 errno = EINVAL; 49 return (NULL); 50 } else 51 flags = __SWR; /* write only */ 52 } else { 53 if (writefn == NULL) 54 flags = __SRD; /* read only */ 55 else 56 flags = __SRW; /* read-write */ 57 } 58 if ((fp = __sfp()) == NULL) 59 return (NULL); 60 fp->_flags = flags; 61 fp->_file = -1; 62 fp->_cookie = (void *)cookie; /* SAFE: cookie not modified */ 63 fp->_read = readfn; 64 fp->_write = writefn; 65 fp->_seek = seekfn; 66 fp->_close = closefn; 67 return (fp); 68 } 69