Split ttyname.c to avoid unnecessary dependencies

[Joel Sherrill]

Eric Bresie wrote:
> Shucks...I thought I had sent this comment out some time back and was
> wondering why it never showed up...let me try again.
>
> ...
> Not sure if newlib is trying to stay Unix/POSIX compliant, but
> splitting the file might be counter to the standard.See
> http://www.opengroup.org/onlinepubs/009695399/functions/ttyname.html
>
> Would an #ifdef _TTYNAME / #ifdef _TTYNAME_R or some such item usable
> allowing on the needed function to be used?
>
>   
I must be missing something. I fail to see how which file(s)
methods are implemented in is covered by the standard at all.

--joel


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