Log Message: |
- introducing env_t (char **): now use &dst for creation/updating of
environments instead of return value of functions.
This makes it easier to have a few additions in a row etc.
- make sure when input whitelist and/or src is null everything works as
expected: new environment should be created and initialized to empty, old
environment should be left unchanged.
- make sure environ.h is effectively included once using a #ifndef
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