This routine returns a pointer to the value of a cgi variable.
Encoded characters (%nn) are already decoded. One must not free the
fields are used (i.e. a variable that may contain several values) the
value returned contains all these values concatenated together with a
newline character as separator.
On success a pointer to a string is returned. If the variable wasn't
transmitted through CGI or was empty NULL is returned.
This CGI library is written by Martin Schulze
<firstname.lastname@example.org>. If you have additions or improvements
please get in touch with him.