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/*

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(void *<[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]>)

        char *<[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 <sys/types.h>

#include <sys/fcntl.h>

#include <stdio.h>

#include <errno.h>

#include "local.h"

#include <_syslist.h>

extern int __sflags ();

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 (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;

  fp->_flags = flags;

  /*

   * If opened for appending, but underlying descriptor

   * does not have O_APPEND bit set, assert __SAPP so that

   * __swrite() will lseek to end before each write.

   */

  if ((oflags & O_APPEND)

#ifdef HAVE_FCNTL

       && !(fdflags & O_APPEND)

#endif

      )

    fp->_flags |= __SAPP;

  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

  return fp;

}

#ifndef _REENT_ONLY

FILE *

_DEFUN (fdopen, (fd, mode),

        int fd _AND

        _CONST char *mode)

{

  return _fdopen_r (_REENT, fd, mode);

}

#endif