/* Copyright (C) 1993-2018 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/>.

   As a special exception, if you link the code in this file with

   files compiled with a GNU compiler to produce an executable,

   that does not cause the resulting executable to be covered by

   the GNU Lesser General Public License.  This exception does not

   however invalidate any other reasons why the executable file

   might be covered by the GNU Lesser General Public License.

   This exception applies to code released by its copyright holders

   in files containing the exception.  */

#include <libioP.h>

#include <stdio.h>

#include <stdlib.h>

#include <shlib-compat.h>

static ssize_t

_IO_cookie_read (FILE *fp, void *buf, ssize_t size)

{

  struct _IO_cookie_file *cfile = (struct _IO_cookie_file *) fp;

  cookie_read_function_t *read_cb = cfile->__io_functions.read;

#ifdef PTR_DEMANGLE

  PTR_DEMANGLE (read_cb);

#endif

  if (read_cb == NULL)

    return -1;

  return read_cb (cfile->__cookie, buf, size);

}

static ssize_t

_IO_cookie_write (FILE *fp, const void *buf, ssize_t size)

{

  struct _IO_cookie_file *cfile = (struct _IO_cookie_file *) fp;

  cookie_write_function_t *write_cb = cfile->__io_functions.write;

#ifdef PTR_DEMANGLE

  PTR_DEMANGLE (write_cb);

#endif

  if (write_cb == NULL)

    {

      fp->_flags |= _IO_ERR_SEEN;

      return 0;

    }

  ssize_t n = write_cb (cfile->__cookie, buf, size);

  if (n < size)

    fp->_flags |= _IO_ERR_SEEN;

  return n;

}

static off64_t

_IO_cookie_seek (FILE *fp, off64_t offset, int dir)

{

  struct _IO_cookie_file *cfile = (struct _IO_cookie_file *) fp;

  cookie_seek_function_t *seek_cb = cfile->__io_functions.seek;

#ifdef PTR_DEMANGLE

  PTR_DEMANGLE (seek_cb);

#endif

  return ((seek_cb == NULL

	   || (seek_cb (cfile->__cookie, &offset, dir)

	       == -1)

	   || offset == (off64_t) -1)

	  ? _IO_pos_BAD : offset);

}

static int

_IO_cookie_close (FILE *fp)

{

  struct _IO_cookie_file *cfile = (struct _IO_cookie_file *) fp;

  cookie_close_function_t *close_cb = cfile->__io_functions.close;

#ifdef PTR_DEMANGLE

  PTR_DEMANGLE (close_cb);

#endif

  if (close_cb == NULL)

    return 0;

  return close_cb (cfile->__cookie);

}

static off64_t

_IO_cookie_seekoff (FILE *fp, off64_t offset, int dir, int mode)

{

  /* We must force the fileops code to always use seek to determine

     the position.  */

  fp->_offset = _IO_pos_BAD;

  return _IO_file_seekoff (fp, offset, dir, mode);

}

static const struct _IO_jump_t _IO_cookie_jumps libio_vtable = {

  JUMP_INIT_DUMMY,

  JUMP_INIT(finish, _IO_file_finish),

  JUMP_INIT(overflow, _IO_file_overflow),

  JUMP_INIT(underflow, _IO_file_underflow),

  JUMP_INIT(uflow, _IO_default_uflow),

  JUMP_INIT(pbackfail, _IO_default_pbackfail),

  JUMP_INIT(xsputn, _IO_file_xsputn),

  JUMP_INIT(xsgetn, _IO_default_xsgetn),

  JUMP_INIT(seekoff, _IO_cookie_seekoff),

  JUMP_INIT(seekpos, _IO_default_seekpos),

  JUMP_INIT(setbuf, _IO_file_setbuf),

  JUMP_INIT(sync, _IO_file_sync),

  JUMP_INIT(doallocate, _IO_file_doallocate),

  JUMP_INIT(read, _IO_cookie_read),

  JUMP_INIT(write, _IO_cookie_write),

  JUMP_INIT(seek, _IO_cookie_seek),

  JUMP_INIT(close, _IO_cookie_close),

  JUMP_INIT(stat, _IO_default_stat),

  JUMP_INIT(showmanyc, _IO_default_showmanyc),

  JUMP_INIT(imbue, _IO_default_imbue),

};

/* Copy the callbacks from SOURCE to *TARGET, with pointer

   mangling.  */

static void

set_callbacks (cookie_io_functions_t *target,

	       cookie_io_functions_t source)

{

#ifdef PTR_MANGLE

  PTR_MANGLE (source.read);

  PTR_MANGLE (source.write);

  PTR_MANGLE (source.seek);

  PTR_MANGLE (source.close);

#endif

  *target = source;

}

void

_IO_cookie_init (struct _IO_cookie_file *cfile, int read_write,

		 void *cookie, cookie_io_functions_t io_functions)

{

  _IO_init_internal (&cfile->__fp.file, 0);

  _IO_JUMPS (&cfile->__fp) = &_IO_cookie_jumps;

  cfile->__cookie = cookie;

  set_callbacks (&cfile->__io_functions, io_functions);

  _IO_new_file_init_internal (&cfile->__fp);

  _IO_mask_flags (&cfile->__fp.file, read_write,

		  _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);

  cfile->__fp.file._flags2 |= _IO_FLAGS2_NEED_LOCK;

  /* We use a negative number different from -1 for _fileno to mark that

     this special stream is not associated with a real file, but still has

     to be treated as such.  */

  cfile->__fp.file._fileno = -2;

}

FILE *

_IO_fopencookie (void *cookie, const char *mode,

		 cookie_io_functions_t io_functions)

{

  int read_write;

  struct locked_FILE

  {

    struct _IO_cookie_file cfile;

#ifdef _IO_MTSAFE_IO

    _IO_lock_t lock;

#endif

  } *new_f;

  switch (*mode++)

    {

    case 'r':

      read_write = _IO_NO_WRITES;

      break;

    case 'w':

      read_write = _IO_NO_READS;

      break;

    case 'a':

      read_write = _IO_NO_READS|_IO_IS_APPENDING;

      break;

    default:

      __set_errno (EINVAL);

      return NULL;

  }

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

    read_write &= _IO_IS_APPENDING;

  new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));

  if (new_f == NULL)

    return NULL;

#ifdef _IO_MTSAFE_IO

  new_f->cfile.__fp.file._lock = &new_f->lock;

#endif

  _IO_cookie_init (&new_f->cfile, read_write, cookie, io_functions);

  return (FILE *) &new_f->cfile.__fp;

}

versioned_symbol (libc, _IO_fopencookie, fopencookie, GLIBC_2_2);

#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)

static off64_t

attribute_compat_text_section

_IO_old_cookie_seek (FILE *fp, off64_t offset, int dir)

{

  struct _IO_cookie_file *cfile = (struct _IO_cookie_file *) fp;

  int (*seek_cb) (FILE *, off_t, int)

    = (int (*) (FILE *, off_t, int)) cfile->__io_functions.seek;

#ifdef PTR_DEMANGLE

  PTR_DEMANGLE (seek_cb);

#endif

  if (seek_cb == NULL)

    return _IO_pos_BAD;

  int ret = seek_cb (cfile->__cookie, offset, dir);

  return (ret == -1) ? _IO_pos_BAD : ret;

}

static const struct _IO_jump_t _IO_old_cookie_jumps libio_vtable = {

  JUMP_INIT_DUMMY,

  JUMP_INIT(finish, _IO_file_finish),

  JUMP_INIT(overflow, _IO_file_overflow),

  JUMP_INIT(underflow, _IO_file_underflow),

  JUMP_INIT(uflow, _IO_default_uflow),

  JUMP_INIT(pbackfail, _IO_default_pbackfail),

  JUMP_INIT(xsputn, _IO_file_xsputn),

  JUMP_INIT(xsgetn, _IO_default_xsgetn),

  JUMP_INIT(seekoff, _IO_cookie_seekoff),

  JUMP_INIT(seekpos, _IO_default_seekpos),

  JUMP_INIT(setbuf, _IO_file_setbuf),

  JUMP_INIT(sync, _IO_file_sync),

  JUMP_INIT(doallocate, _IO_file_doallocate),

  JUMP_INIT(read, _IO_cookie_read),

  JUMP_INIT(write, _IO_cookie_write),

  JUMP_INIT(seek, _IO_old_cookie_seek),

  JUMP_INIT(close, _IO_cookie_close),

  JUMP_INIT(stat, _IO_default_stat),

  JUMP_INIT(showmanyc, _IO_default_showmanyc),

  JUMP_INIT(imbue, _IO_default_imbue),

};

FILE *

attribute_compat_text_section

_IO_old_fopencookie (void *cookie, const char *mode,

		     cookie_io_functions_t io_functions)

{

  FILE *ret;

  ret = _IO_fopencookie (cookie, mode, io_functions);

  if (ret != NULL)

    _IO_JUMPS_FILE_plus (ret) = &_IO_old_cookie_jumps;

  return ret;

}

compat_symbol (libc, _IO_old_fopencookie, fopencookie, GLIBC_2_0);

#endif