Convert camel case to all caps underscored

Convert camel case to all caps underscored:

$ echo -e 'SomeNiceHTTPCandyTCPSocketWrapper\nSimpleExample\nMoreHTTPFun' \
  | sed 's,\([A-Z][A-Z]*\)\([A-Z]\),\1_\2,g;s,\([a-z]\)\([A-Z]\),\1_\2,g' \
  | tr '[a-z]' '[A-Z]'
SOME_NICE_HTTP_CANDY_TCP_SOCKET_WRAPPER
SIMPLE_EXAMPLE
MORE_HTTP_FUN
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