void cgi_opentag(struct sink *output, const char *name, ...);
void cgi_closetag(struct sink *output, const char *name);
char *cgi_makeurl(const char *url, ...);
void cgi_opentag(struct sink *output, const char *name, ...);
void cgi_closetag(struct sink *output, const char *name);
char *cgi_makeurl(const char *url, ...);