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 * @param index Index (counted in plain characters) where to start
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 * @param index Index (counted in plain characters) where to start
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 *              the decoding.
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 *              the decoding.
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 * @param limit Size of the substring.
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 * @param limit Size of the substring.
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 *
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 *
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 * @return  Value of decoded character or '?' on decoding error.
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 * @return  Value of decoded character or '?' on decoding error.
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 *
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 */
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 */
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wchar_t chr_decode(const char *str, size_t *offset, size_t sz)
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wchar_t chr_decode(const char *str, size_t *offset, size_t sz)
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{
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{
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    uint8_t b0, b;          /* Bytes read from str. */
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    uint8_t b0, b;          /* Bytes read from str. */
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    wchar_t ch;
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    wchar_t ch;
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}
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}
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/** Check whether character is Unicode.
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/** Check whether character is Unicode.
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 *
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 *
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 * @return True if character is valid Unicode code point.
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 * @return True if character is valid Unicode code point.
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 *
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 */
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 */
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bool unicode_check(const wchar_t ch)
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bool unicode_check(const wchar_t ch)
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{
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{
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    if ((ch >= 0) && (ch <= 1114111))
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    if ((ch >= 0) && (ch <= 1114111))
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        return true;
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        return true;
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    return false;
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    return false;
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}
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}
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/** Return number of plain characters in a string.
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/** Return number of bytes the string occupies.
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 *
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 * @param str NULL-terminated string.
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 *
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 * @return Number of characters in @a str.
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 *
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 *
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 * @param str A string.
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 * @return Number of bytes in @a str excluding the null terminator.
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 */
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 */
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size_t strlen(const char *str)
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size_t str_size(const char *str)
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{
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{
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    size_t size;
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    size_t size;
- 
 
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- 
 
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    size = 0;
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    for (size = 0; str[size]; size++);
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    while (*str++ != '\0')
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        ++size;
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    return size;
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    return size;
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}
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}
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/** Return number of characters in a string.
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/** Return number of characters in a string.
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 *
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 *
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 * @param src First string to compare.
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 * @param src First string to compare.
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 * @param dst Second string to compare.
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 * @param dst Second string to compare.
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 * @param len Maximal length for comparison.
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 * @param len Maximal length for comparison.
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 *
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 *
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 * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
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 * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
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 *
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 */
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 */
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int strncmp(const char *src, const char *dst, size_t len)
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int strncmp(const char *src, const char *dst, size_t len)
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{
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{
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    unsigned int i;
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    unsigned int i;
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 * last copied character.
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 * last copied character.
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 *
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 *
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 * @param src  Source string.
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 * @param src  Source string.
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 * @param dest Destination buffer.
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 * @param dest Destination buffer.
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 * @param len  Size of destination buffer.
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 * @param len  Size of destination buffer.
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 *
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 */
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 */
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void strncpy(char *dest, const char *src, size_t len)
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void strncpy(char *dest, const char *src, size_t len)
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{
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{
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    unsigned int i;
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    unsigned int i;
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