Provided by: libfontconfig-doc_2.15.0-2.3ubuntu1_all 

NAME
FcCharSetSubtract - Subtract charsets
SYNOPSIS
#include <fontconfig/fontconfig.h>
FcCharSet * FcCharSetSubtract (const FcCharSet *a, const FcCharSet *b);
DESCRIPTION
Returns a set including only those chars found in a but not b.
Fontconfig 2.15.0 04 July 2025 FcCharSetSubtract(3)