KCGIXML(3)

NAME
kcgixml, kxml_close, kxml_open, kxml_push, kxml_pushattrs, kxml_pushnull, kxml_pushnullattrs, kxml_pop, kxml_popall, kxml_putc, kxml_puts, kxml_write - XML handling functions for kcgi

LIBRARY
libkcgixml

SYNOPSIS
#include <stdarg.h>
#include <stdint.h>
#include <unistd.h>
#include <kcgi.h>
#include <kcgixml.h>
int
kxml_close(struct kxmlreq *xml);
void
kxml_open(struct kxmlreq *xml, struct kreq *req, const char *const *elems, size_t elemsz);
int
kxml_push(struct kxmlreq *xml, size_t elem);
int
kxml_pushattrs(struct kxmlreq *xml, size_t elem, ...);
void
kxml_pushnull(struct kxmlreq *xml, size_t elem);
void
kxml_pushnullattrs(struct kxmlreq *xml, size_t elem, ...);
int
kxml_pop(struct kxmlreq *xml);
void
kxml_popall(struct kxmlreq *xml);
void
kxml_putc(struct kxmlreq *xml, char c);
void
kxml_puts(struct kxmlreq *xml, const char *cp);
int
kxml_write(const char *cp, size_t sz, void *arg);

DESCRIPTION
The kcgixml functions extend kcgi(3) output with very simple XML-specific output. None of these functions may be called before khttp_body(3).

All kcgixml sequences begin and end with kxml_open and kxml_close, respectively. An array of possible elements is passed as elems to kxml_open(). This is later indexed into with kxml_push(), kxml_pushnull(), kxml_pushattrs(), and kxml_pushnullattrs() to open elements. The kxml_pop() family closes out opened elements.

To use these functions, you must include the <kcgixml.h> header and compile with kcgixml, for example,

    % cc -I/usr/local/include -c -o sample.o sample.c
    % cc -L/usr/local/lib -o sample -lkcgixml -lkcgi -lz

kxml_close()
    Close an XML context as opened with kxml_open(). This will also close any open elements. You should not use the object after invoking this function.

kxml_open()
    Open an XML context, binding it to elems, a set of elements (e.g., "DAV:set" or "html"), the number of elements elemsz, the kcgi(3) request object req, and an output object xml.

kxml_push()
    Push the element-open tag indexed by elem() onto the output stream.

kxml_pushattrs()
    Push the element-open tag indexed by elem() onto the output stream, as well as a sequence of nil-terminated pairs of attributes. The last attribute key must be a NULL to terminate the list.

kxml_pushnull()
    Like kxml_push(), but producing an empty-element tag.

kxml_pushnullattrs()
    Like kxml_pushattrs(), but producing an empty-element tag.

kxml_pop()
    Pop the current open tag as opened by kxml_push() or kxml_pushattrs().

kxml_popall()
    Pop all open tags.

kxml_putc()
    Write a single character within the currently-open tag, escaping it properly as opaque text.

kxml_puts()
    Invokes kxml_putc() for all characters in the nil-terminated string.

kxml_write()
    Invokes kxml_putc() for all elements in the bounded buffer.

RETURN VALUES
Functions returning an int indicating zero on failure and non-zero on success. This occurs if the requested element is over (for kxml_push()) or under (for kxml_pop()) the scope domain.

STANDARDS
The kcgixml functions conform to the XML 1.0 mark-up specification.

AUTHORS
The kcgixml library was written by Kristaps Dzonsons <kristaps@bsd.lv>.