FcCharSetAddChar (3) - Linux Manuals
FcCharSetAddChar: Add a character to a charset
NAME
FcCharSetAddChar - Add a character to a charset
SYNOPSIS
#include <fontconfig/fontconfig.h>
FcBool FcCharSetAddChar (FcCharSet *fcs, FcChar32 ucs4);
DESCRIPTION
FcCharSetAddChar adds a single Unicode char to the set, returning FcFalse on failure, either as a result of a constant set or from running out of memory.