KHTML_ELEMAT(3) Library Functions Manual KHTML_ELEMAT(3)

khtml_elemat
get element stack depth of kcgihtml

library “libkcgihtml”

#include <sys/types.h>
#include <stdarg.h>
#include <stdint.h>
#include <kcgi.h>
#include <kcgihtml.h>

size_t
khtml_elemat(const struct khtmlreq *req);

Gets the current depth of the element stack of req, initialised with khtml_open(3). This is usually used with khtml_closeto(3).

If called before opening any element contexts (i.e., a depth of zero), a subsequent khtml_closeto(3) will close all open scopes.

The following outputs a simple HTML page. It assumes r is a struct kreq pointer. For brevity, it does not do any error checking.
khttp_head(r, kresps[KRESP_STATUS],
  "%s", khttps[KHTTP_200]);
khttp_head(r, kresps[KRESP_CONTENT_TYPE],
  "%s", kmimetypes[KMIME_TEXT_HTML]);
khttp_body(r);
khtml_open(&req, r, 0);
khtml_elem(&req, KELEM_DOCTYPE);
khtml_elem(&req, KELEM_HTML);
pos = khtml_elemat(&req); /* save at html */
khtml_elem(&req, KELEM_HEAD);
khtml_elem(&req, KELEM_TITLE);
khtml_puts(&req, "Hello, world.");
khtml_closeto(&req, pos); /* to html */
khtml_closeelem(&req, 1); /* head */
khtml_elem(&req, KELEM_BODY);
khtml_puts(&req, "Hello, world");
khtml_close(&req);

kcgihtml(3)

Written by Kristaps Dzonsons <kristaps@bsd.lv>.

If called in a scope that's subsequently closed, then a new scope reopened and filled in, a corresponding khtml_closeto(3) will unwind the stack to the new scope. In other words this does not identify a savepoint: it's merely the scope depth.
March 26, 2020 OpenBSD 6.5