Function HandleWriteImpl

Source/cmFileCommand.cxx:75–146

namespace {

bool HandleWriteImpl(std::vector<std::string> const& args, bool append,
                     cmExecutionStatus& status)
{
  if (args.size() < 2) {
    status.SetError(cmStrCat(
      args[0], " must be called with at least one additional argument."));
    return false;
  }
  auto i = args.begin();

  i++; // Get rid of subcommand

  std::string fileName = *i;
  if (!cmsys::SystemTools::FileIsFullPath(*i)) {
    fileName =
      cmStrCat(status.GetMakefile().GetCurrentSourceDirectory(), '/', *i);
  }

  i++;

  if (!status.GetMakefile().CanIWriteThisFile(fileName)) {
    std::string e = cmStrCat("attempted to write a file: ", fileName,
                             " into a source directory.");
    status.SetError(e);
    cmSystemTools::SetFatalErrorOccurred();
    return false;
  }
  std::string dir = cmSystemTools::GetFilenamePath(fileName);
  cmSystemTools::MakeDirectory(dir);

  mode_t mode = 0;
  bool writable = false;

  // Set permissions to writable
  if (cmSystemTools::GetPermissions(fileName, mode)) {
#if defined(_MSC_VER) || defined(__MINGW32__)
    writable = (mode & S_IWRITE) != 0;
    mode_t newMode = mode | S_IWRITE;
#else
    writable = mode & S_IWUSR;
    mode_t newMode = mode | S_IWUSR | S_IWGRP;
#endif
    if (!writable) {
      cmSystemTools::SetPermissions(fileName, newMode);
    }
  }
  // If GetPermissions fails, pretend like it is ok. File open will fail if
  // the file is not writable
  cmsys::ofstream file(fileName.c_str(),
                       append ? std::ios::app : std::ios::out);
  if (!file) {
    std::string error =
      cmStrCat("failed to open for writing (",
               cmSystemTools::GetLastSystemError(), "):\n  ", fileName);
    status.SetError(error);
    return false;
  }
  std::string message = cmJoin(cmMakeRange(i, args.end()), std::string());