Provided by: libfontconfig-doc_2.15.0-1.1ubuntu2_all 

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.
Fontconfig 2.15.0 31 March 2024 FcCharSetAddChar(3)