lib/libc/stdio/funopen.c

   1 /*      $NetBSD: funopen.c,v 1.9 2003/08/07 16:43:26 agc Exp $  */
   2
   3 /*-
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Chris Torek.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 #if 0
  38 static char sccsid[] = "@(#)funopen.c   8.1 (Berkeley) 6/4/93";
  39 #else
  40 __RCSID("$NetBSD: funopen.c,v 1.9 2003/08/07 16:43:26 agc Exp $");
  41 #endif
  42 #endif /* LIBC_SCCS and not lint */
  43
  44 #include <stdio.h>
  45 #include <errno.h>
  46 #include "reentrant.h"
  47 #include "local.h"
  48
  49 FILE *
  50 funopen(cookie, readfn, writefn, seekfn, closefn)
  51         const void *cookie;
  52         int (*readfn) __P((void *, char *, int));
  53         int (*writefn) __P((void *, const char *, int));
  54         fpos_t (*seekfn) __P((void *, fpos_t, int));
  55         int (*closefn) __P((void *));
  56 {
  57         FILE *fp;
  58         int flags;
  59
  60         if (readfn == NULL) {
  61                 if (writefn == NULL) {          /* illegal */
  62                         errno = EINVAL;
  63                         return (NULL);
  64                 } else
  65                         flags = __SWR;          /* write only */
  66         } else {
  67                 if (writefn == NULL)
  68                         flags = __SRD;          /* read only */
  69                 else
  70                         flags = __SRW;          /* read-write */
  71         }
  72         if ((fp = __sfp()) == NULL)
  73                 return (NULL);
  74         fp->_flags = flags;
  75         fp->_file = -1;
  76         fp->_cookie = __UNCONST(cookie);
  77         fp->_read = readfn;
  78         fp->_write = writefn;
  79         fp->_seek = seekfn;
  80         fp->_close = closefn;
  81         return (fp);
  82 }