StdLib/LibC/Stdio/fdopen.c

   1 /*  $NetBSD: fdopen.c,v 1.14 2003/08/07 16:43:22 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 #include  <LibConfig.h>
  35 #include  <sys/EfiCdefs.h>
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 #if 0
  38 static char sccsid[] = "@(#)fdopen.c  8.1 (Berkeley) 6/4/93";
  39 #else
  40 __RCSID("$NetBSD: fdopen.c,v 1.14 2003/08/07 16:43:22 agc Exp $");
  41 #endif
  42 #endif /* LIBC_SCCS and not lint */
  43
  44 #include  "namespace.h"
  45 #include  <sys/types.h>
  46
  47 #include  <assert.h>
  48 #include  <errno.h>
  49 #include  <fcntl.h>
  50 #include  <sys/EfiSysCall.h>
  51 #include  <stdio.h>
  52
  53 #include  "reentrant.h"
  54 #include  "local.h"
  55
  56 #ifdef __weak_alias
  57 __weak_alias(fdopen,_fdopen)
  58 #endif
  59
  60 FILE *
  61 fdopen(int fd, const char *mode)
  62 {
  63   FILE *fp;
  64   int flags, oflags, fdflags, tmp;
  65
  66   _DIAGASSERT(fd != -1);
  67
  68   if ((flags = __sflags(mode, &oflags)) == 0)
  69     return (NULL);
  70
  71   /* Make sure the mode the user wants is a subset of the actual mode. */
  72   if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)
  73     return (NULL);
  74   tmp = fdflags & O_ACCMODE;
  75   if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
  76     errno = EINVAL;
  77     return (NULL);
  78   }
  79
  80   if (oflags & O_NONBLOCK) {
  81     struct stat st;
  82     if (fstat(fd, &st) == -1) {
  83       return (NULL);
  84     }
  85     if (!S_ISREG(st.st_mode)) {
  86       errno = EFTYPE;
  87       return (NULL);
  88     }
  89   }
  90
  91   if ((fp = __sfp()) == NULL)
  92     return (NULL);
  93   fp->_flags = (unsigned short)flags;
  94   /*
  95    * If opened for appending, but underlying descriptor does not have
  96    * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
  97    * end before each write.
  98    */
  99   if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
 100     fp->_flags |= __SAPP;
 101   fp->_file = (short)fd;
 102   fp->_cookie = fp;
 103   fp->_read = __sread;
 104   fp->_write = __swrite;
 105   fp->_seek = __sseek;
 106   fp->_close = __sclose;
 107   return (fp);
 108 }