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/*

 * Copyright (c) 1990 The Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice and this paragraph are

 * duplicated in all such forms and that any documentation,

 * advertising materials, and other materials related to such

 * distribution and use acknowledge that the software was developed

 * by the University of California, Berkeley.  The name of the

 * University may not be used to endorse or promote products derived

 * from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 */

/*

FUNCTION

<<fdopen>>---turn open file into a stream

INDEX

        fdopen

INDEX

        _fdopen_r

ANSI_SYNOPSIS

        #include <stdio.h>

        FILE *fdopen(int <[fd]>, const char *<[mode]>);

        FILE *_fdopen_r(struct _reent *<[reent]>,

                        int <[fd]>, const char *<[mode]>);

TRAD_SYNOPSIS

        #include <stdio.h>

        FILE *fdopen(<[fd]>, <[mode]>)

        int <[fd]>;

        char *<[mode]>;

        FILE *_fdopen_r(<[reent]>, <[fd]>, <[mode]>)

        struct _reent *<[reent]>;

        int <[fd]>;

        char *<[mode]>);

DESCRIPTION

<<fdopen>> produces a file descriptor of type <<FILE *>>, from a

descriptor for an already-open file (returned, for example, by the

system subroutine <<open>> rather than by <<fopen>>).

The <[mode]> argument has the same meanings as in <<fopen>>.

RETURNS

File pointer or <<NULL>>, as for <<fopen>>.

PORTABILITY

<<fdopen>> is ANSI.

*/

#include <_ansi.h>

#include <reent.h>

#include <sys/types.h>

#include <sys/fcntl.h>

#include <stdio.h>

#include <errno.h>

#include "local.h"

#include <_syslist.h>

FILE *

_DEFUN(_fdopen_r, (ptr, fd, mode),

       struct _reent *ptr _AND

       int fd             _AND

       _CONST char *mode)

{

  register FILE *fp;

  int flags, oflags;

#ifdef HAVE_FCNTL

  int fdflags, fdmode;

#endif

  if ((flags = __sflags (ptr, mode, &oflags)) == 0)

    return 0;

  /* make sure the mode the user wants is a subset of the actual mode */

#ifdef HAVE_FCNTL

  if ((fdflags = _fcntl_r (ptr, fd, F_GETFL, 0)) < 0)

    return 0;

  fdmode = fdflags & O_ACCMODE;

  if (fdmode != O_RDWR && (fdmode != (oflags & O_ACCMODE)))

    {

      ptr->_errno = EBADF;

      return 0;

    }

#endif

  if ((fp = __sfp (ptr)) == 0)

    return 0;

  _flockfile (fp);

  fp->_flags = flags;

  /* POSIX recommends setting the O_APPEND bit on fd to match append

     streams.  Someone may later clear O_APPEND on fileno(fp), but the

     stream must still remain in append mode.  Rely on __sflags

     setting __SAPP properly.  */

#ifdef HAVE_FCNTL

  if ((oflags & O_APPEND) && !(fdflags & O_APPEND))

    _fcntl_r (ptr, fd, F_SETFL, fdflags | O_APPEND);

#endif

  fp->_file = fd;

  fp->_cookie = (_PTR) fp;

#undef _read

#undef _write

#undef _seek

#undef _close

  fp->_read = __sread;

  fp->_write = __swrite;

  fp->_seek = __sseek;

  fp->_close = __sclose;

#ifdef __SCLE

  /* Explicit given mode results in explicit setting mode on fd */

  if (oflags & O_BINARY)

    setmode (fp->_file, O_BINARY);

  else if (oflags & O_TEXT)

    setmode (fp->_file, O_TEXT);

  if (__stextmode (fp->_file))

    fp->_flags |= __SCLE;

#endif

  _funlockfile (fp);

  return fp;

}

#ifndef _REENT_ONLY

FILE *

_DEFUN(fdopen, (fd, mode),

       int fd _AND

       _CONST char *mode)

{

  return _fdopen_r (_REENT, fd, mode);

}

#endif