Fix escape of special char

Author: lucic71

cpp2rust/converter/converter.cpp

@@ -1728,7 +1728,7 @@ std::string Converter::GetEscapedCharLiteral(char character) const {
     return "\\0";
   }
   auto uc = static_cast<unsigned char>(character);
-  if (uc < 0x20 || uc == 0x7F) {
+  if (uc < 0x20 || uc >= 0x7F) {
     return std::format("\\x{:02x}", uc);
   }
   return std::string(1, character);

tests/unit/string_escape.cpp

@@ -2,11 +2,11 @@
 #include <string.h>
 
 int main() {
-  const char *special = "\a\b\t\n\v\f\r !\"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~";
+  const char *special = "\a\b\t\n\v\f\r !\"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~\xff";
   static const char expected[] = {
       7,  8,  9,  10, 11, 12, 13, 32, 33,  34,  35,  36,  37, 38,
       39, 40, 41, 42, 43, 44, 45, 46, 47,  58,  59,  60,  61, 62,
-      63, 64, 91, 92, 93, 94, 95, 96, 123, 124, 125, 126,
+      63, 64, 91, 92, 93, 94, 95, 96, 123, 124, 125, 126, 255
   };
   for (int i = 0; i < (int)(sizeof(expected) / sizeof(expected[0])); i++) {
     assert(special[i] == expected[i]);