text: // Copyright 2018 Google LLC
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  
  int main(int argc, char** argv) {
      bool ok = true;
      for (int i = 1; i < argc; ++i) {
          FILE *f = fopen(argv[i], "a");
          if (f == nullptr) {
              printf("error: unable to touch %s\n", argv[i]);
              ok = false;
          } else {
              fclose(f);
          }
      }
  
      return ok ? 0 : 1;
  }
  