[Bug 2959] New: busybox ls does not consider an order of mutually exclusive options

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=2959

           Summary: busybox ls does not consider an order of mutually
                    exclusive options
           Product: Busybox
           Version: 1.17.x
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Standard Compliance
        AssignedTo: unassigned at busybox.net
        ReportedBy: kimyunho at kaist.ac.kr
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


According to IEEE Std 1003.1 ls section,
-------------------
Specifying more than one of the options in the following mutually-exclusive
pairs shall not be considered an error: -C and -l (ell), [XSI]  -m and -l
(ell), -x and -l (ell),  -C and -1 (one), -H and -L, -c and -u. The last option
specified in each pair shall determine the output format.
-------------------

However, through concolic testing, we found that busybox ls does not follow
this standard and ignores the order of mutually exclusive options. For example,

// Standard Linux ls
[moonzoo at verifier ls-bug]$ ls -C1
a.txt
b.txt
[moonzoo at verifier ls-bug]$ ls -1C
a.txt  b.txt

// Busybox ls 
[moonzoo at verifier ls-bug]$ ../busybox-1.17.0/busybox ls -C1
a.txt
b.txt
[moonzoo at verifier ls-bug]$ ../busybox-1.17.0/busybox ls -1C
a.txt
b.txt

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