KXML_PUSHNULL(3) Library Functions Manual KXML_PUSHNULL(3)

NAME

kxml_pushnull, kxml_pushnullattrswrite a null element for kcgixml

LIBRARY

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>.
March 27, 2020 OpenBSD 6.7