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+/* Copyright (C) 1997-2017 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/>.  */
+
+/* This header provides no interface for a user to the internals of
+   the gconv implementation in the libc.  Therefore there is no use
+   for these definitions beside for writing additional gconv modules.  */
+
+#ifndef _GCONV_H
+#define _GCONV_H	1
+
+#include <features.h>
+#include <bits/types/__mbstate_t.h>
+#include <bits/types/wint_t.h>
+
+#define __need_size_t
+#define __need_wchar_t
+#include <stddef.h>
+
+/* ISO 10646 value used to signal invalid value.  */
+#define __UNKNOWN_10646_CHAR	((wchar_t) 0xfffd)
+
+/* Error codes for gconv functions.  */
+enum
+{
+  __GCONV_OK = 0,
+  __GCONV_NOCONV,
+  __GCONV_NODB,
+  __GCONV_NOMEM,
+
+  __GCONV_EMPTY_INPUT,
+  __GCONV_FULL_OUTPUT,
+  __GCONV_ILLEGAL_INPUT,
+  __GCONV_INCOMPLETE_INPUT,
+
+  __GCONV_ILLEGAL_DESCRIPTOR,
+  __GCONV_INTERNAL_ERROR
+};
+
+
+/* Flags the `__gconv_open' function can set.  */
+enum
+{
+  __GCONV_IS_LAST = 0x0001,
+  __GCONV_IGNORE_ERRORS = 0x0002,
+  __GCONV_SWAP = 0x0004,
+  __GCONV_TRANSLIT = 0x0008
+};
+
+
+/* Forward declarations.  */
+struct __gconv_step;
+struct __gconv_step_data;
+struct __gconv_loaded_object;
+
+
+/* Type of a conversion function.  */
+typedef int (*__gconv_fct) (struct __gconv_step *, struct __gconv_step_data *,
+			    const unsigned char **, const unsigned char *,
+			    unsigned char **, size_t *, int, int);
+
+/* Type of a specialized conversion function for a single byte to INTERNAL.  */
+typedef wint_t (*__gconv_btowc_fct) (struct __gconv_step *, unsigned char);
+
+/* Constructor and destructor for local data for conversion step.  */
+typedef int (*__gconv_init_fct) (struct __gconv_step *);
+typedef void (*__gconv_end_fct) (struct __gconv_step *);
+
+
+/* Description of a conversion step.  */
+struct __gconv_step
+{
+  struct __gconv_loaded_object *__shlib_handle;
+  const char *__modname;
+
+  int __counter;
+
+  char *__from_name;
+  char *__to_name;
+
+  __gconv_fct __fct;
+  __gconv_btowc_fct __btowc_fct;
+  __gconv_init_fct __init_fct;
+  __gconv_end_fct __end_fct;
+
+  /* Information about the number of bytes needed or produced in this
+     step.  This helps optimizing the buffer sizes.  */
+  int __min_needed_from;
+  int __max_needed_from;
+  int __min_needed_to;
+  int __max_needed_to;
+
+  /* Flag whether this is a stateful encoding or not.  */
+  int __stateful;
+
+  void *__data;		/* Pointer to step-local data.  */
+};
+
+/* Additional data for steps in use of conversion descriptor.  This is
+   allocated by the `init' function.  */
+struct __gconv_step_data
+{
+  unsigned char *__outbuf;    /* Output buffer for this step.  */
+  unsigned char *__outbufend; /* Address of first byte after the output
+				 buffer.  */
+
+  /* Is this the last module in the chain.  */
+  int __flags;
+
+  /* Counter for number of invocations of the module function for this
+     descriptor.  */
+  int __invocation_counter;
+
+  /* Flag whether this is an internal use of the module (in the mb*towc*
+     and wc*tomb* functions) or regular with iconv(3).  */
+  int __internal_use;
+
+  __mbstate_t *__statep;
+  __mbstate_t __state;	/* This element must not be used directly by
+			   any module; always use STATEP!  */
+};
+
+
+/* Combine conversion step description with data.  */
+typedef struct __gconv_info
+{
+  size_t __nsteps;
+  struct __gconv_step *__steps;
+  __extension__ struct __gconv_step_data __data[0];
+} *__gconv_t;
+
+/* Transliteration using the locale's data.  */
+extern int __gconv_transliterate (struct __gconv_step *step,
+				  struct __gconv_step_data *step_data,
+				  const unsigned char *inbufstart,
+				  const unsigned char **inbufp,
+				  const unsigned char *inbufend,
+				  unsigned char **outbufstart,
+				  size_t *irreversible);
+
+#endif /* gconv.h */