NAME

khtml_attr, khtml_attrx — open an element scope for kcgihtml

LIBRARY

library “libkcgihtml”

SYNOPSIS

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

enum kcgi_err
khtml_attr(struct khtmlreq *req, enum kelem elem, ...);

enum kcgi_err
khtml_attrx(struct khtmlreq *req, enum kelem elem, ...);

DESCRIPTION

Open a new scope of element elem on the current element stack of req, initialised with khtml_open(3). Scopes are closed with khtml_closeelem(3), khtml_closeto(3), or khtml_close(3). If elem is a "void" eleemnt (self-closing, like KELEM_LINK) or KELEM_DOCTYPE, the scope is immediately closed so no new scope is opened.

For khtml_attr(), variable arguments are in pairs, with the first of a pair being a enum attr of the attribute type and the second being a non-NULL string.

For khtml_attrx(), variable arguments are in triplets: the first is a enum attr of the attribute type, the second is a enum attrx describing the data format of the third type, and the third type is either an int64_t, char *, or double for KATTRX_INT, KATTRX_STRING, or KATTRX_DOUBLE, respectively.

In both cases, string content is HTML escaped, for example, the double-quote character is rendered as """. This prevents arguments from "breaking" the attribute string context.

The variable arguments terminated with a singular KATTR__MAX.

RETURN VALUES

Returns an enum kcgi_err indicating the error state.

KCGI_OK

Success (not an error).

KCGI_ENOMEM

Internal memory allocation failure, including reaching the maximum number of possible HTML scopes.

KCGI_HUP

The output connection has been terminated. For FastCGI connections, the current connection should be released with khttp_free(3) and parse loop reentered.

KCGI_FORM

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.

KCGI_SYSTEM

Internal system error writing to the output stream.

EXAMPLES

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_HEAD);
khtml_attr(req, KELEM_META,
  KATTR_CHARSET, "utf-8", KATTR__MAX);
khtml_attrx(req, KELEM_LINK,
  KATTR_REL, KATTRX_STRING, "stylesheet",
  KATTR_HREF, KATTRX_STRING, "style.css",
  KATTR__MAX);
khtml_close(&req);

The latter invocation could just as easily use khtml_attr().

SEE ALSO

kcgihtml(3)

STANDARDS

The referenced HTML5 standard is HTML5.2.

AUTHORS

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