Function GetUTF8Str

paddle/phi/kernels/strings/unicode.h:174–186

// Need to guarantee utf8_str has enough memory

HOSTDEVICE inline void GetUTF8Str(const uint32_t* unicode_str,
                                  char* utf8_str,
                                  size_t unicode_len) {
  char dst_char[5] = {0};
  for (size_t i = 0; i < unicode_len; ++i) {
    uint32_t utf8_uint32 = UnicodeToUTF8(unicode_str[i]);
    uint32_t utf8_char_count = UnicodeToUTF8Char(utf8_uint32, dst_char);
    dst_char[utf8_char_count] = '\0';
    memcpy(utf8_str, dst_char, utf8_char_count);
    utf8_str += utf8_char_count;
  }
  *utf8_str = '\0';
}

const uint8_t* GetUniFlagMap();
const uint16_t* GetCharCasesMap();