/* Copyright (C) 1994-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <hurd.h>

#include <stdio.h>

#include <fcntl.h>

#include <string.h>

/* Read up to N chars into BUF from COOKIE.

   Return how many chars were read, 0 for EOF or -1 for error.  */

static ssize_t

readio (void *cookie, char *buf, size_t n)

{

  mach_msg_type_number_t nread;

  error_t err;

  char *bufp = buf;

  nread = n;

  if (err = __io_read ((io_t) cookie, &bufp, &nread, -1, n))

    return __hurd_fail (err);

  if (bufp != buf)

    {

      memcpy (buf, bufp, nread);

      __vm_deallocate (__mach_task_self (),

		       (vm_address_t) bufp, (vm_size_t) nread);

    }

  return nread;

}

/* Write up to N chars from BUF to COOKIE.

   Return how many chars were written or -1 for error.  */

static ssize_t

writeio (void *cookie, const char *buf, size_t n)

{

  mach_msg_type_number_t wrote;

  error_t err;

  if (err = __io_write ((io_t) cookie, buf, n, -1, &wrote))

    return __hurd_fail (err);

  return wrote;

}

/* Move COOKIE's file position *POS bytes, according to WHENCE.

   The current file position is stored in *POS.

   Returns zero if successful, nonzero if not.  */

static int

seekio (void *cookie,

	off64_t *pos,

	int whence)

{

  error_t err = __io_seek ((file_t) cookie, *pos, whence, pos);

  return err ? __hurd_fail (err) : 0;

}

/* Close the file associated with COOKIE.

   Return 0 for success or -1 for failure.  */

static int

closeio (void *cookie)

{

  error_t error = __mach_port_deallocate (__mach_task_self (),

					  (mach_port_t) cookie);

  if (error)

    return __hurd_fail (error);

  return 0;

}

#include "../libio/libioP.h"

#define fopencookie _IO_fopencookie

static const cookie_io_functions_t funcsio =

{ readio, writeio, seekio, closeio };

/* Open a stream on PORT.  MODE is as for fopen.  */

FILE *

__fopenport (mach_port_t port, const char *mode)

{

  int pflags;

  int needflags;

  error_t err;

  const char *m = mode;

  switch (*m++)

    {

    case 'r':

      needflags = O_READ;

      break;

    case 'w':

      needflags = O_WRITE;

      break;

    case 'a':

      needflags = O_WRITE|O_APPEND;

      break;

    default:

      return NULL;

  }

  if (m[0] == '+' || (m[0] == 'b' && m[1] == '+'))

    needflags |= O_RDWR;

  /* Verify the PORT is valid allows the access MODE specifies.  */

  if (err = __io_get_openmodes (port, &pflags))

    return __hurd_fail (err), NULL;

  /* Check the access mode.  */

  if ((pflags & needflags) != needflags)

    {

      errno = EBADF;

      return NULL;

    }

  return fopencookie ((void *) port, mode, funcsio);

}

weak_alias (__fopenport, fopenport)