Function unget

tools/tokenizer/token_common.c:186–204

}

void unget(int cc)
{
  if (cc == EOF) return;
  if (buffered < MAX_BUF) {
    if (cc == '\n' || cc == '\r') {
      linenr--;
      // column was 0 right after getting the \n
      // hopefully there are no multiple ungets of \n
      column = saved_col;
    }
    else
      column--;
    buffer[buffered++] = cc;
  }
  else {
    fprintf(stderr, "(F): Lookahead buffer overflow (MAX=%u).\n", MAX_BUF);
    exit(2);
  }
}

/* Determine programming language from filename extension:
   .c             | C