char *end;  if (length<8) { fprintf (stderr, "Invalid/corrupted comments\n"); return; } end = c+length;
static void print_comments(char *comments, int length){   char *c=comments;   int len, i, nb_fields;   len=readint(c, 0);   c+=4;   fwrite(c, 1, len, stderr);   c+=len;   fprintf (stderr, "\n");   nb_fields=readint(c, 0);   c+=4;   for (i=0;i<nb_fields;i++)   {      len=readint(c, 0);      c+=4;      fwrite(c, 1, len, stderr);      c+=len;      fprintf (stderr, "\n");   }}