FcCharSetSubtractCount - Subtract and count charsets
#include <fontconfig.h>
FcChar32 FcCharSetSubtractCount(const FcCharSet *a);
(const FcCharSet *b);
.fi
Returns the number of chars that are in a but not in b.
Fontconfig version 2.8.0
18 November 2009 FcCharSetSubtractCount(3)