Function ReadWithPrefix

Source/cmLoadCacheCommand.cxx:93–162

}

static bool ReadWithPrefix(std::vector<std::string> const& args,
                           cmExecutionStatus& status)
{
  // Make sure we have a prefix.
  if (args.size() < 3) {
    status.SetError("READ_WITH_PREFIX form must specify a prefix.");
    return false;
  }

  // Make sure the cache file exists.
  std::string cacheFile = args[0] + "/CMakeCache.txt";
  if (!cmSystemTools::FileExists(cacheFile)) {
    std::string e = "Cannot load cache file from " + cacheFile;
    status.SetError(e);
    return false;
  }

  // Prepare the table of variables to read.
  std::string const& prefix = args[2];
  std::set<std::string> const variablesToRead(args.begin() + 3, args.end());

  // Read the cache file.
  cmsys::ifstream fin(cacheFile.c_str());

  cmMakefile& mf = status.GetMakefile();

  // This is a big hack read loop to overcome a buggy ifstream
  // implementation on HP-UX.  This should work on all platforms even
  // for small buffer sizes.
  int const bufferSize = 4096;
  char buffer[bufferSize];
  std::string line;
  while (fin) {
    // Read a block of the file.
    fin.read(buffer, bufferSize);
    if (fin.gcount()) {
      // Parse for newlines directly.
      char const* i = buffer;
      char const* end = buffer + fin.gcount();
      while (i != end) {
        char const* begin = i;
        while (i != end && *i != '\n') {
          ++i;
        }
        if (i == begin || *(i - 1) != '\r') {
          // Include this portion of the line.
          line += std::string(begin, i - begin);
        } else {
          // Include this portion of the line.
          // Don't include the \r in a \r\n pair.
          line += std::string(begin, i - 1 - begin);
        }
        if (i != end) {
          // Completed a line.
          CheckLine(mf, prefix, variablesToRead, line.c_str());
          line.clear();

          // Skip the newline character.