clear_mode
{ "-isig", "Disable signal trapping", clear_mode, 1, MODE_TRAPSIG },
{ "-edit", "Disable character editing", clear_mode, 1, MODE_EDIT },
{ "-softtabs", "Disable character editing", clear_mode, 1, MODE_SOFT_TAB },
{ "-litecho", "Disable literal character echo", clear_mode, 1, MODE_LIT_ECHO },
int clear_mode(int);