KXML_PUSHNULL(3)

NAME
kxml_pushnull, kxml_pushnullattrs - write a null element for kcgixml

LIBRARY
libkcgixml

SYNOPSIS
#include <sys/types.h>
#include <stdarg.h>
#include <stdint.h>
#include <kcgi.h>
#include <kcgixml.h>
enum kcgi_err
kxml_pushnull(struct kxmlreq *req, size_t elem);
enum kcgi_err
kxml_pushnullattrs(struct kxmlreq *req, size_t elem, ...);

DESCRIPTION
Write a null (self-closing) element elem on the current element stack of req, initialised with kxml_open(3). The element must be in the element array passed to kxml_open(3).

The kxml_pushnullattrs() form accepts pairs of character string arguments, the first being an attribute name, the second its value. This list must be terminated by a NULL pointer. Attribute names are left as-is: the caller must make sure that keys are valid XML. Attribute values are XML escaped to prevent content from breaking out of the attribute string.

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 JSON 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.

KCGI_WRITER
    The elem is not a valid element index.

EXAMPLES
The following outputs a simple XML page. It assumes r is a struct kreq pointer. For brevity, it does not do any error checking.

    const char *const elems[] =
      { "foo", "bar", "baz" };
    khttp_head(r, kresps[KRESP_STATUS],
      "%s", khttps[KHTTP_200]);
    khttp_head(r, kresps[KRESP_CONTENT_TYPE],
      "%s", kmimetypes[KMIME_TEXT_XML]);
    khttp_body(r);
    kxml_open(&req, r, elems, 3);
    kxml_pushnull(&req, 0); /* foo */
    kxml_pushnullattrs(&req, 1, "key", "val", NULL); /* bar */
    kxml_close(&req);

SEE ALSO
kcgixml(3)

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