const char * c_keywords[] = {
  "register",     "volatile",     "auto",         "const",        "static",       "extern",       "if",           "else",
  "do",           "while",        "for",          "continue",     "switch",       "case",         "default",      "break",
  "enum",         "union",        "struct",       "typedef",      "goto",         "void",         "return",       "sizeof",
  "char",         "short",        "int",          "long",         "signed",       "unsigned",     "float",        "double",
  NULL
};

const char * preprocessor_keywords[] = {
  "#include",     "#pragma",      "#define",      "#undef",       "#ifdef",       "#ifndef",      "#elifdef",     "#elifndef",
  "#if",          "#elif",        "#else",        "#endif",       "#embed",       "#line",        "#error",       "#warning",
  NULL
};

new_char_tokens("+-&|.()[]{}", operator_hl);
new_keyword_tokens(c_keywords, control_hl);
new_keyword_tokens(preprocessor_keywords, special_hl);
new_region_token("/\\*", "\\*/", comment_hl);
new_region_token("//", "\\n", comment_hl);
new_region_token("\"", "\"", string_literal_hl);
new_region_token("<", ">", string_literal_hl);
new_keyword_token("keyword", special_hl);
new_keyword_token("while", operator_hl);