Function IsDriveLetter

cpp/src/arrow/filesystem/util_internal.cc:109–112

#ifdef _WIN32
static bool IsDriveLetter(char c) {
  // Can't use locale-dependent functions from the C/C++ stdlib
  return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
}
#endif

bool DetectAbsolutePath(const std::string& s) {