FcStrSetAddFilename − add a filename to a string set
#include <fontconfig/fontconfig.h>
FcBool FcStrSetAddFilename (FcStrSet *set, const FcChar8 *s);
Adds a copy s to set, The copy is created with FcStrCopyFilename so that leading ’~’ values are replaced with the value of the HOME environment variable.
Fontconfig version 2.10.95