Allocate a new variable via xmalloc that can be added to the global environment. The resulting string will be null-terminated immediately after the end of the array.
Construct a variable from name and value and put it in the environment while saving the previous value of the environment variable into a global list so it can be restored later.
Restore the original environment.
Save the environment variable name if not saved already.
env.d Documentation: https://dlang.org/phobos/dmd_env.html Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/env.d
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Functions for modifying environment variables.