[issue1341] printenv(1): don't allow '=' in name

[Stathis Kamperis (via DragonFly issue tracker)]

Stathis Kamperis <ekamperi at gmail.com> added the comment:

: It sounds to me that printenv's environment search is what needs to
: be fixed.  The environ has one environment variable per array entry.
: instead of doing the memcmp() it should iterate forwards looking for
: the first '=', then do a length check and, if the length matches,
: finally a memcmp().

They way you put it, seems more reasonable to me.
I attached a new diff.

Cheers,
Stathis

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