#ifndef UTF8_UTIL_H
#define UTF8_UTIL_H
/**
*
* Modified from the following linenoise source.
*
* Copyright (c) 2014 Texas Instruments Inc.
*
* ---------------------------------------------------------------------
* UTF-8 utility functions
*
* (c) 2010 Steve Bennett <steveb@workware.net.au>
*
* See LICENCE for licence details.
*/

namespace LineNoise
{
#ifndef USE_UTF8
#include <ctype.h>

  /* No utf-8 support. 1 byte = 1 char */
#define utf8_strlen(S, B) ((B) < 0 ? (int)strlen(S) : (B))
#define utf8_tounicode(S, CP) (*(CP) = (unsigned char)*(S), 1)
#define utf8_index(C, I) (I)
#define utf8_charlen(C) 1

#else
/**
  * Converts the given unicode codepoint (0 - 0xffff) to utf-8
  * and stores the result at 'p'.
  *
  * Returns the number of utf-8 characters (1-3).
  */
int utf8_fromunicode(char *p, unsigned short uc);

/**
  * Returns the length of the utf-8 sequence starting with 'c'.
  *
  * Returns 1-4, or -1 if this is not a valid start byte.
  *
  * Note that charlen=4 is not supported by the rest of the API.
  */
int utf8_charlen(int c);

/**
  * Returns the number of characters in the utf-8
  * string of the given byte length.
  *
  * Any bytes which are not part of an valid utf-8
  * sequence are treated as individual characters.
  *
  * The string *must* be null terminated.
  *
  * Does not support unicode code points > \uffff
  */
int utf8_strlen(const char *str, int bytelen);

/**
  * Returns the byte index of the given character in the utf-8 string.
  *
  * The string *must* be null terminated.
  *
  * This will return the byte length of a utf-8 string
  * if given the char length.
  */
int utf8_index(const char *str, int charindex);

/**
  * Returns the unicode codepoint corresponding to the
  * utf-8 sequence 'str'.
  *
  * Stores the result in *uc and returns the number of bytes
  * consumed.
  *
  * If 'str' is null terminated, then an invalid utf-8 sequence
  * at the end of the string will be returned as individual bytes.
  *
  * If it is not null terminated, the length *must* be checked first.
  *
  * Does not support unicode code points > \uffff
  */
int utf8_tounicode(const char *str, int *uc);

#endif

}
#endif
