/* Copyright 2009-2015
 * Kaz Kylheku <kaz@kylheku.com>
 * Vancouver, Canada
 * All rights reserved.
 *
 * Redistribution of this software in source and binary forms, with or without
 * modification, is permitted provided that the following two conditions are met.
 *
 * Use of this software in any manner constitutes agreement with the disclaimer
 * which follows the two conditions.
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 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.  IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DAMAGES, HOWEVER CAUSED,
 * AND UNDER ANY THEORY OF LIABILITY, ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

size_t utf8_from_uc(wchar_t *, const unsigned char *);
size_t utf8_from(wchar_t *, const char *);
size_t utf8_to_uc(unsigned char *, const wchar_t *);
size_t utf8_to(char *, const wchar_t *);
wchar_t *utf8_dup_from_uc(const unsigned char *);
wchar_t *utf8_dup_from(const char *);
char *utf8_dup_to(const wchar_t *);
unsigned char *utf8_dup_to_uc(const wchar_t *);

enum utf8_state { utf8_init, utf8_more1, utf8_more2, utf8_more3 };

#define UTF8_ADMIT_NUL 1

typedef struct utf8_decoder {
  enum utf8_state state;
  int flags;
  wchar_t wch, wch_min;
  int head, tail, back;
  int buf[8];
} utf8_decoder_t;

int utf8_encode(wchar_t, int (*put)(int ch, mem_t *ctx), mem_t *ctx);
void utf8_decoder_init(utf8_decoder_t *);
wint_t utf8_decode(utf8_decoder_t *,int (*get)(mem_t *ctx), mem_t *ctx);

FILE *w_fopen(const wchar_t *, const wchar_t *);
FILE *w_popen(const wchar_t *, const wchar_t *);
FILE *w_freopen(const wchar_t *, const wchar_t *, FILE *);
FILE *w_fdopen(int, const wchar_t *);
int w_remove(const wchar_t *);
int w_rename(const wchar_t *, const wchar_t *);