KHTML_PRINTF(3) Library Functions Manual KHTML_PRINTF(3)

khtml_printf
put variable content for kcgihtml

library “libkcgihtml”

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

enum kcgi_err
khtml_printf(struct khtmlreq *req, const char *fmt, ...);

Writes output according to the given fmt to a context req initialised with khtml_open(3). The format is as for printf(3).

If fmt is NULL, it does nothing and returns success. All of the content is HTML escaped, for example, the left-angle bracket “<” is rendered as “&lt;”.

Returns an enum kcgi_err indicating the error state.
Success (not an error).
Internal memory allocation failure.
The output connection has been terminated. For FastCGI connections, the current connection should be released with khttp_free(3) and parse loop reentered.
The connection is still expecting headers with khttp_head(3). Indicates that khttp_body(3) did not return with success or was not invoked. For FastCGI connections, the current connection should be released with khttp_free(3) and parse loop reentered.
Internal system error writing to the output stream.

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);
khtml_elem(&req, KELEM_BODY);
khtml_elem(&req, KELEM_P);
khtml_printf(&req, "%s", "Hello, world.");
khtml_close(&req);

kcgihtml(3)

Written by Kristaps Dzonsons <kristaps@bsd.lv>.
March 26, 2020 OpenBSD 6.5