bin/37954: "tail -c 2" broken

[Thomas Klausner <wiz%NetBSD.org@localhost>]

>Number:         37954
>Category:       bin
>Synopsis:       "tail -c 2" broken
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Feb 04 15:25:00 +0000 2008
>Originator:     Thomas Klausner
>Release:        NetBSD 4.99.52
>Organization:
>Environment:
        
        
System: NetBSD hiro 4.99.52 NetBSD 4.99.52 (HIRO64) #2: Mon Feb 4 14:29:50 CET 
2008 wiz@hiro:/usr/src/sys/arch/amd64/compile/obj/HIRO64 amd64
Architecture: x86_64
Machine: amd64
>Description:
tail -c 2 is broken. It should display the last two characters of its input.
Output on NetBSD for -c 1 to -c 3 is:
# echo -n abc | tail -c 3; echo
abc
# echo -n abc | tail -c 2; echo
b
# echo -n abc | tail -c 1; echo
c

For comparison, with tail (GNU coreutils) 5.97:
# echo -n abc | tail -c 3; echo
abc
# echo -n abc | tail -c 2; echo
bc
# echo -n abc | tail -c 1; echo
c

>How-To-Repeat:
See above.
>Fix:
        

>Unformatted: