#define NOARGC  /* no arg count passing */›#define FIXARGC /* don't expect arg counts passed in */›/*›** return 'true' if c is a control character›** (0-31 or 127)›*/›iscntrl(c) ›char * c; ›$(›  /* c is a simulated unsigned integer */›  return ((c <= 31) || (c == 127));›$)›