[Bug 268479] lib/libc/stdlib/getenv.c may have a problem with putenv()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268479

Mark Millard <marklmi26-fbsd@yahoo.com> changed:

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--- Comment #2 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Dennis Clarke from comment #1)

The way I read that material it indicates:

A) '\0' is available as a potential internal(!) string terminator
   because the content of the string being represented is
   disallowed from including a '\0'.

B) Nothing in the wording indicates an empty string is disallowed
   from being represented. Such an empty string could be followed
   by a string terminator ('\0') in the internal representation.

> However putenv and setenv both allow the value to be just a NUL byte '\0'

I suspect that this is '\0' used as an internal-string-terminator,
not as content of the represented string.

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