%%	options

copyright owner	=	Dirk Krause
copyright year	=	2014
license		=	bsd

%%	header

#ifdef __cplusplus
extern "C" {
#endif

/**	Compare key value pairs.
	@param	l	Left object.
	@param	r	Right object.
	@param	cr	Comparison criteria (0=object/object, 1=object/string).
	@return	Comparison result
*/
int
dk3kv_compare(void const *l, void const *r, int cr);

/**	Remove key value pair, release memory.
	@param	p	Key value pair to release.
*/
void
dk3kv_delete(dk3_key_value_t *p);

/**	Create new key value pair.
	@param	k	Key.
	@param	v	Value, may be NULL.
	@param	app	Application structure for diagnostics, may be NULL.
	@return	Pointer to new data on success, NULL on error.
*/
dk3_key_value_t *
dk3kv_new_app(dkChar const *k, dkChar const *v, dk3_app_t *app);

#ifdef __cplusplus
}
#endif


%%	module


#include "dk3all.h"



int
dk3kv_compare(void const *l, void const *r, int cr)
{
  int			 back	= 0;
  dk3_key_value_t const	*pl;
  dk3_key_value_t const	*pr;
  if(l) {
    if(r) {
      pl = (dk3_key_value_t const *)l;
      switch(cr) {
        case 1: {
	  back = dk3str_cmp(pl->key, (dkChar const *)r);
	} break;
	default: {
	  pr = (dk3_key_value_t const *)r;
	  back = dk3str_cmp(pl->key, pr->key);
	} break;
      }
    } else back = 1;
  } else {
    if(r) back = -1;
  }
  return back;
}



void
dk3kv_delete(dk3_key_value_t *p)
{
  if(p) {
    dk3_release(p->key);
    dk3_release(p->val);
    dk3_delete(p);
  }
}



dk3_key_value_t *
dk3kv_new_app(dkChar const *k, dkChar const *v, dk3_app_t *app)
{
  dk3_key_value_t	*back	= NULL;
  if(k) {
    back = dk3_new_app(dk3_key_value_t,1,app);
    if(back) {
      back->key = NULL;
      back->val = NULL;
      back->key = dk3str_dup_app(k, app);
      if(back->key) {
        if(v) {
	  back->val = dk3str_dup_app(v, app);
	  if(!(back->val)) {
	    dk3kv_delete(back);
	    back = NULL;
	  }
	}
      } else {
        dk3kv_delete(back);
	back = NULL;
      }
    }
  }
  return back;
}