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int main(int argc, char *argv[]) {
  char *buff;

  buff = (char *)malloc(BUFSIZE);
  if (!buff) {
     /* handle error condition */
  }
  ...
  free(buff);
  ...
  strncpy(buff, argv[1], BUFSIZE-1);
}

int main(int argc, char *argv[]) {
  char *buff;

  buff = (char *) malloc(BUFSIZE);
  if (!buff) {
     /* handle error condition */
  }
  ...
  strncpy(buff, argv[1], BUFSIZE-1);
  ...
  free(buff);

}