funopen.c - vx32 - Local 9vx git repository for patches.
 (HTM) git clone git://r-36.net/vx32
 (DIR) Log
 (DIR) Files
 (DIR) Refs
       ---
       funopen.c (2886B)
       ---
            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. All advertising materials mentioning features or use of this software
           17  *    must display the following acknowledgement:
           18  *        This product includes software developed by the University of
           19  *        California, Berkeley and its contributors.
           20  * 4. Neither the name of the University nor the names of its contributors
           21  *    may be used to endorse or promote products derived from this software
           22  *    without specific prior written permission.
           23  *
           24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
           25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
           26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
           27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
           28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
           29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
           30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
           31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
           32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
           33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
           34  * SUCH DAMAGE.
           35  */
           36 
           37 #if defined(LIBC_SCCS) && !defined(lint)
           38 static char rcsid[] = "$OpenBSD: funopen.c,v 1.3 1997/07/25 20:30:09 mickey Exp $";
           39 #endif /* LIBC_SCCS and not lint */
           40 
           41 #include <stdio.h>
           42 #include <errno.h>
           43 #include "local.h"
           44 
           45 FILE *
           46 funopen(cookie, readfn, writefn, seekfn, closefn)
           47         const void *cookie;
           48         int (*readfn)(), (*writefn)();
           49 #ifdef __STDC__
           50         fpos_t (*seekfn)(void *cookie, fpos_t off, int whence);
           51 #else
           52         fpos_t (*seekfn)();
           53 #endif
           54         int (*closefn)();
           55 {
           56         register FILE *fp;
           57         int flags;
           58 
           59         if (readfn == NULL) {
           60                 if (writefn == NULL) {                /* illegal */
           61                         errno = EINVAL;
           62                         return (NULL);
           63                 } else
           64                         flags = __SWR;                /* write only */
           65         } else {
           66                 if (writefn == NULL)
           67                         flags = __SRD;                /* read only */
           68                 else
           69                         flags = __SRW;                /* read-write */
           70         }
           71         if ((fp = __sfp()) == NULL)
           72                 return (NULL);
           73         fp->_flags = flags;
           74         fp->_file = -1;
           75         fp->_cookie = (void *)cookie;
           76         fp->_read = readfn;
           77         fp->_write = writefn;
           78         fp->_seek = seekfn;
           79         fp->_close = closefn;
           80         return (fp);
           81 }