[Toybox] Mutually Exclusive Arguments. Bug?

[briggers at ninthfloor.org]

Hi,

I was trying to use the ~ control character to implement mutually 
exclusive option arguments.

pwd takes two options -P and -L, which are mutually exclusive. Using the ~ 
control character the optstring should be "L~PP~L". Using this optstring 
gives a "Segmentation fault (core dumped)" error when running the pwd 
command.

For optstring "LP~L" the command runs. But since the command line 
arguments are parsed from left to right "-L -P" results in an optflag 
value of 1, and "-P -L" gives an optflag value of 3. Since the options are 
mutually exclusive, the optflag value should be either 1 or 2 (or 0 incase 
of no arguments)

optstring "L~PP" also gives "Segmentation fault (core dumped)" error.

It seems disabling an option before it is even defined in the optstring is 
the cause for the segmentation fault. I'm not sure if this is intentional 
or not.

I'm at a loss at trying to implement order independent argument exclusion 
without using ~. Ideas, suggestions?

--

Ashish Bhate

 1338728859.0