Attached patch uses MISSING_CODE as Mark suggested. There are still errors apparently because parsecodes() may return either an int or a tuple. I think only mac encodings are affected, so I would like to commit the current patch before tackling this issue.
$ ../../python.exe gencodec.py MAPPINGS/VENDORS/APPLE/ build/ mac_
converting ARABIC.TXT to build/mac_arabic.py and build/mac_arabic.mapping
converting CELTIC.TXT to build/mac_celtic.py and build/mac_celtic.mapping
converting CENTEURO.TXT to build/mac_centeuro.py and build/mac_centeuro.mapping
converting CHINSIMP.TXT to build/mac_chinsimp.py and build/mac_chinsimp.mapping
Traceback (most recent call last):
File "gencodec.py", line 424, in <module>
convertdir(*sys.argv[1:])
File "gencodec.py", line 394, in convertdir
pymap(mappathname, map, dirprefix + codefile,name,comments)
File "gencodec.py", line 358, in pymap
code = codegen(name,map,encodingname,comments)
File "gencodec.py", line 271, in codegen
precisions=(4, 2))
File "gencodec.py", line 155, in python_mapdef_code
mappings = sorted(map.items())
TypeError: unorderable types: tuple() < int()