Someone

Options +FollowSymLinks
RewriteEngine on
#
RewriteCond %{HTTP_HOST} ^([^.]+)\.www\.site\.info
RewriteRule (.*) http://%1.site.info/$1 [R=301,L]
#
RewriteCond %{REQUEST_URI} !^/c\.php
RewriteCond %{HTTP_HOST} !^www\.site\.info
RewriteCond %{HTTP_HOST} ^([^.]+)\.site\.info
RewriteRule .* http://www.site.info/c.php?q=%1 [L]
#
RewriteBase /~brian/rewrite_test
#
RewriteCond %{REQUEST_URI} !^/~brian/rewrite_test/index.html$
RewriteRule ^(.*).html? c.php?z=3&q=$1 [L]