cl_putc
cl_putc(cl, '\b');
cl_putc(cl, ' ');
cl_putc(cl, '\b');
cl_putc(cl, ' ');
cl_putc(cl, '^');
cl_putc(cl, UNCNTRL(c));
cl_putc(cl, c);
cl_putc(cl, '\n');
cl_putc(cl, '\007');
cl_putc(cl, '\n');
cl_putc(cl, '\n');
static void cl_putc(struct cmdline *, int);