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)