---

dltree.c

static char const cvsid[] = "$Id: dltree_8c-source.html,v 1.10 2001/10/10 20:40:59 sandro Exp $";

#include <stdlib.h>
#include "dltree.h"

void *dltree_alloc(size_t bytes) {
  return calloc(bytes, 4);
}

void dltree_free(void *node) {
  free(node);
}

/*
void *dltree_prepend_child(void *parent, void*node) {
  
}
*/

#define child ((DLTreeNode *) v_child)
#define parent ((DLTreeNode *) v_parent)
void *dltree_append_child(void *v_parent, void *v_child) {
  child->next = 0;
  child->prev = parent->last;
  parent->last = child;
  if (parent->first) {
    child->prev->next = child;
  } else {
    parent->first = child;
  }
  return v_parent;
}

void *dltree_unlink_last_child(void *v_parent) {
  void *v_child = parent->last;
  if (child) {
    if (parent->last == parent->first) {
      parent->last = 0;
      parent->first = 0;
    } else {
      parent->last = child->prev;
      parent->last->next = 0;
    }
    child->prev = 0;
    child->next = 0;
  }
  return v_child;
}

#undef child
#undef parent

---

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