Function parse_size

src/ccache/util/string.cpp:392–436

}

tl::expected<std::pair<uint64_t, SizeUnitPrefixType>, std::string>
parse_size(const std::string& value)
{
  errno = 0;

  char* p;
  double result = strtod(value.c_str(), &p);
  if (errno != 0 || result < 0 || p == value.c_str() || value.empty()) {
    return tl::unexpected(FMT("invalid size: \"{}\"", value));
  }

  while (util::is_space(*p)) {
    ++p;
  }

  SizeUnitPrefixType prefix_type;
  if (*p != '\0') {
    prefix_type = *(p + 1) == 'i' ? SizeUnitPrefixType::binary
                                  : SizeUnitPrefixType::decimal;
    unsigned multiplier =
      prefix_type == SizeUnitPrefixType::binary ? 1024 : 1000;
    switch (*p) {
    case 'T':
      result *= multiplier;
      [[fallthrough]];
    case 'G':
      result *= multiplier;
      [[fallthrough]];
    case 'M':
      result *= multiplier;
      [[fallthrough]];
    case 'K':
    case 'k':
      result *= multiplier;
      break;
    default:
      return tl::unexpected(FMT("invalid size: \"{}\"", value));
    }
  } else {
    result *= 1024 * 1024 * 1024;
    prefix_type = SizeUnitPrefixType::binary;
  }

  return std::make_pair(static_cast<uint64_t>(result), prefix_type);
}

tl::expected<mode_t, std::string>
parse_umask(std::string_view value)