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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd



%%	header

/**	@file
	Preferences as key/value pairs; the module contains functions
	to create and destroy a preference structure and to compare
	preference structures by name or against a given name.

	Typically preferences are stored in a dk4_sto_t structure.

	CRT on Windows: Optional.
*/

#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif

#ifndef DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif

#ifndef	DK4STR8_H_INCLUDED
#include "dk4str8.h"
#endif

#ifndef	DK4STRW_H_INCLUDED
#include "dk4strw.h"
#endif

#ifndef DK4STRD_H_INCLUDED
#include "dk4strd.h"
#endif



/**	Preferences storage.
*/
typedef struct {
  dkChar	*name;	/**< Preference name. */
  dkChar	*value;	/**< Value. */
} dk4_pref_t;



#ifdef __cplusplus
extern "C" {
#endif

/**	Create preferences structure, allocate memory.
	@param	name	Preference name.
	@param	value	Preference value.
	@param	erp	Error report, may be NULL.
	@return	Pointer to new preferences object on success, NULL on error.
*/
dk4_pref_t *
dk4pref_open(dkChar const *name, dkChar const *value, dk4_er_t *erp);

/**	Destroy preference structure, release memory.
	@param	ptr	Preference structure to destroy.
*/
void
dk4pref_close(dk4_pref_t *ptr);

/**	Comparison function.
	@param	l	Left pointer.
	@param	r	Right pointer.
	@param	cr	Comparison criteria:
			0=structure/structure,
			1=structure/name.
	@return	Comparison result.
*/
int
dk4pref_compare(const void *l, const void *r, int cr);

#ifdef __cplusplus
}
#endif



%%	module


#include "dk4pref.h"
#include "dk4mem.h"



$!trace-include



dk4_pref_t *
dk4pref_open(dkChar const *name, dkChar const *value, dk4_er_t *erp)
{
  dk4_pref_t	*back	=	NULL;
  $? "+ dk4pref_open \"%!ds\"=\"%!ds\"", TR_DKSTR(name), TR_DKSTR(value)
  if ((NULL != name) && (NULL != value)) {
    back = dk4mem_new(dk4_pref_t,1,erp);
    if (NULL != back) {
      back->name = NULL;
      back->value = NULL;
      back->name = dk4str_dup(name, erp);
      back->value = dk4str_dup(value, erp);
      if ((NULL == back->name) || (NULL == back->value)) {
        dk4pref_close(back);
	back = NULL;
      }
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  } $? "- dk4pref_open PTR=%d", TR_IPTR(back)
  return back;
}



void
dk4pref_close(dk4_pref_t *ptr)
{
  $? "+ dk4pref_close"
  if (NULL != ptr) {
    $? ". \"%!ds\"=\"%!ds\"", TR_DKSTR(ptr->name), TR_DKSTR(ptr->value)
#if 0
    /*	Original stuff.
    */
    dk4mem_release(ptr->name);
    dk4mem_release(ptr->value);
#endif
    /*	2016-12-10	Sanitize memory before releasing it.
    */
    dk4str_release_sanitized(ptr->name);
    dk4str_release_sanitized(ptr->value);
    dk4mem_free(ptr);
  }
  $? "- dk4pref_close"
}



int
dk4pref_compare(const void *l, const void *r, int cr)
{
  const dk4_pref_t	*pl;
  const dk4_pref_t	*pr;
  int			 back	=	0;
  $? "+ dk4pref_compare"
  if (NULL != l) {
    if (NULL != r) {
      pl = (const dk4_pref_t *)l;
      switch (cr) {
        case 1: {
	  if (NULL != pl->name) {
	    back = dk4str_cmp(pl->name, (const dkChar *)r);
	  } else {
	    back = -1;
	  }
	} break;
	default: {
	  pr = (const dk4_pref_t *)r;
	  if (NULL != pl->name) {
	    if (NULL != pr->name) {
	      back = dk4str_cmp(pl->name, pr->name);
	    } else {
	      back = 1;
	    }
	  } else {
	    if (NULL != pr->name) {
	      back = -1;
	    }
	  }
	} break;
      }
    } else {
      back = 1;
    }
  } else {
    if (NULL != r) {
      back = -1;
    }
  } $? "- dk4pref_compare %d", back
  return back;
}