escape_key

Escape arbitrary_text such that it's a valid key element (i.

e. one part of the key path). The escaped key won't pass valid_key because it isn't a whole key (i.e. it doesn't have a preceding slash), but prepending a slash to the escaped text should always result in a valid key.

Parameters:

arbitrary_text	some text in any encoding or format
len	length of arbitrary_text in bytes, or -1 if arbitrary_text is nul-terminated

Returns:

a nul-terminated valid GConf key