https://github.com/Alexpux/firebird-git-svn/blob/master/src/common/unicode_util.cpp#L1334Just a heads up: that is an outdated clone of an old repository that was synced from subversion and hasn't been updated since 2015.The Firebird repository is on https://github.com/FirebirdSQL/firebird Mark
Thanks. Then, maybe it is the following: https://github.com/FirebirdSQL/firebird/blob/2d973b902efe5f00d15a1cd533835f8fba3e8e99/src/common/unicode_util.cpp#L1324 Hiro Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel