include addchstr
call2 OK `\004c\004d\004e\006f\006g` mvinchnstr 0 2 6
call2 OK `\000 \000 \000 \000 \000 \000 ` mvinchnstr 0 74 10
call2 OK `\000 \000 \000 \000 \000 \000 \000 ` mvinchstr 0 73