[Toybox] new toy: rev

[Elie De Brauwer]

Hi Rob, hello world,

In attachment you can find an implementation of 'rev' including tests. 
As far as I know it's included in posix, nor lsb but it lives in 
util-linux and busybox also has it.

edb at lapedb:~/edb-stuff/toybox/toybox$ echo "abc" | rev
cba
edb at lapedb:~/edb-stuff/toybox/toybox$ echo -en "abc\ndef" | rev
cba
fed
edb at lapedb:~/edb-stuff/toybox/toybox$ echo "abc" | ./toybox rev
cba
edb at lapedb:~/edb-stuff/toybox/toybox$ echo -en "abc\ndef" | ./toybox rev
cba
fed

I just wrote it because it was rather easy and I bumped into it while 
looking at tac yesterday, btw it also suffers from the /dev/full bug 
since it also uses xputs.

gr
E.
-- 
Elie De Brauwer

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