[Asterisk-Dev] ast_xxx function..?

[Matt Hess]

I've run into a problem with head that I'd like to make a patch for but 
I need to see first if an ast_ function exists to strip all non 
alphanumeric characters from a char.. in this case the nonce variable in 
chan_sip. Some sip analog gateways send a nonce improperly and getting 
the vendors to fix it has been a real pita 'wait and see' thing. The 
example nonce I am working off of looks like: nonce="7d0ae5ad" ", which 
is clearly wrong. I would like to ensure that nonce only has alpha 
numeric characters in it as I believe it should not be allowed to 
contain a quote or space in the value.. all I really need to see is if 
asterisk already has a function to do this and return the cleaned string.

Please don't blast me too much for this.. I'm just trying to help 
correct a problem so we can move to the new asterisk version.

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