stdio.subproj/fdopen.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1990, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * This code is derived from software contributed to Berkeley by
  27  * Chris Torek.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58
  59 #include <sys/types.h>
  60 #include <fcntl.h>
  61 #include <unistd.h>
  62 #include <stdio.h>
  63 #include <errno.h>
  64 #include "local.h"
  65
  66 FILE *
  67 fdopen(fd, mode)
  68         int fd;
  69         const char *mode;
  70 {
  71         register FILE *fp;
  72         static int nofile;
  73         int flags, oflags, fdflags, tmp;
  74
  75         if (nofile == 0)
  76                 nofile = getdtablesize();
  77
  78         if ((flags = __sflags(mode, &oflags)) == 0)
  79                 return (NULL);
  80
  81         /* Make sure the mode the user wants is a subset of the actual mode. */
  82         if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)
  83                 return (NULL);
  84         tmp = fdflags & O_ACCMODE;
  85         if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
  86                 errno = EINVAL;
  87                 return (NULL);
  88         }
  89
  90         if ((fp = __sfp()) == NULL)
  91                 return (NULL);
  92         fp->_flags = flags;
  93         /*
  94          * If opened for appending, but underlying descriptor does not have
  95          * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
  96          * end before each write.
  97          */
  98         if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
  99                 fp->_flags |= __SAPP;
 100         fp->_file = fd;
 101         fp->_cookie = fp;
 102         fp->_read = __sread;
 103         fp->_write = __swrite;
 104         fp->_seek = __sseek;
 105         fp->_close = __sclose;
 106         return (fp);
 107 }