stdio/FreeBSD/funopen.c

   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 sccsid[] = "@(#)funopen.c   8.1 (Berkeley) 6/4/93";
  39 #endif /* LIBC_SCCS and not lint */
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD: src/lib/libc/stdio/funopen.c,v 1.5 2002/05/28 16:59:39 alfred Exp $");
  42
  43 #include <stdio.h>
  44 #include <errno.h>
  45
  46 #include "local.h"
  47
  48 FILE *
  49 funopen(cookie, readfn, writefn, seekfn, closefn)
  50         const void *cookie;
  51         int (*readfn)(), (*writefn)();
  52         fpos_t (*seekfn)(void *cookie, fpos_t off, int whence);
  53         int (*closefn)();
  54 {
  55         FILE *fp;
  56         int flags;
  57
  58         if (readfn == NULL) {
  59                 if (writefn == NULL) {          /* illegal */
  60                         errno = EINVAL;
  61                         return (NULL);
  62                 } else
  63                         flags = __SWR;          /* write only */
  64         } else {
  65                 if (writefn == NULL)
  66                         flags = __SRD;          /* read only */
  67                 else
  68                         flags = __SRW;          /* read-write */
  69         }
  70         if ((fp = __sfp()) == NULL)
  71                 return (NULL);
  72         fp->_flags = flags;
  73         fp->_file = -1;
  74         fp->_cookie = (void *)cookie;
  75         fp->_read = readfn;
  76         fp->_write = writefn;
  77         fp->_seek = seekfn;
  78         fp->_close = closefn;
  79         return (fp);
  80 }