escape and use apostrophe

[zimbot]

friends,

i am in need of some expert c coder advice.

i admin a mailserver , qmailtoster.
that checks a user address to make sure ( hopefully ) that it is not a spam machine bot.

anyways -- it uses a func called check user

here is a doc on how that goes to allow a \

CHKUSR - Enable characters for Blackberry devices - QMail-Toaster

in short -- i need to allow an ' within a account name

I was wondering - i am no C coder myself -
if i do it wrong - can i do harm? -
meaning if i did : define CHKUSER_ALLOW_SENDER_CHAR_3 "'"
might it fail to compile ?
or if it compiles might it simply fail to allow the apostrophe?
mostly - dose anyone think - i could do 'harm' by errant attempts
my list of trys might be
CHKUSER_ALLOW_SENDER_CHAR_3 ''' [ apostrophe apostrophe apostrophe ]
CHKUSER_ALLOW_SENDER_CHAR_3 "'" [ dblQuote apostrophe dblQuote }
CHKUSER_ALLOW_SENDER_CHAR_3 '\'' [ apostrophe escapeSlash apostrophe apostrophe ]
if any BIG C coders have a suggestion -- i would welcome the wisdom
thanks

[Salem]

> here is a doc on how that goes to allow a \
Except they say it's a / and not a \

The instructions seem detailed enough - what's the problem?

> mostly - dose anyone think - i could do 'harm' by errant attempts
Mostly it will fail to compile if you mess up what should be between the double quotes.
If that's your only change and it compiles, then you should be good.