[Toybox] bc broken

[Daniel Rosenberg]

Found the issue. strcopy is copying the string past the null character.

On Thu, Mar 21, 2019 at 3:54 PM enh <enh at google.com> wrote:

> commit 1a3c65c868b676c86073025465f57116d0e91881 broke bc... there's no
> output any more from, say, `1+1`...
>
> i had a look through the diff, but it wasn't obvious what the active
> ingredient was. the tests still pass, and that seems legit --- only
> input stdin is broken. files work fine (with or without -l).
>
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