Convenience link to the line: http://git.suckless.org/st/tree/st.c#n2315
Here, techo is calling ISCONTROL(c) where c is a 'char'. But ISCONTROLC1 is always going to return false for a char. Perhaps it should test against ISCONTROLC0 instead? Or is this line intended to use ISCONTROL for some reason? For the record, I came across this while porting st to OS X using native APIs (NSWindow, NSView, CoreText, etc). -Steven
