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/*
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* lftp - file transfer program
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*
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* Copyright (c) 1996-2013 by Alexander V. Lukyanov (lav@yars.free.net)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef XLIST_H
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#define XLIST_H 1
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// this list implementation is based on linux kernel idea of lists
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#include <stddef.h>
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#include <assert.h>
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template<class T> class xlist
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{
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xlist<T> *next;
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xlist<T> *prev;
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T *obj;
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static void _add(xlist<T> *node,xlist<T> *prev,xlist<T> *next) {
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next->prev=node;
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node->next=next;
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node->prev=prev;
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prev->next=node;
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}
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static void _del(xlist<T> *prev,xlist<T> *next) {
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next->prev=prev;
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prev->next=next;
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}
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protected:
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xlist() : next(this), prev(this), obj(0) {}
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public:
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xlist(T *t) : next(0), prev(0), obj(t) {}
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void add(xlist<T> *node) {
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assert(!node->next && !node->prev);
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_add(node,this,next);
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}
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void add(xlist<T>& node) { add(&node); }
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void add_tail(xlist<T> *node) {
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assert(!node->next && !node->prev);
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_add(node,prev,this);
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}
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void add_tail(xlist<T>& node) { add_tail(&node); }
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void remove() {
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_del(prev,next);
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next=prev=0;
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}
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xlist<T> *get_next() const { return next; }
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xlist<T> *get_prev() const { return prev; }
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T *get_obj() const { return obj; }
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T *next_obj() const { return next->obj; }
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int count() const {
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int count=0;
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for(xlist<T> *scan=next; scan!=this; scan=scan->next)
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count++;
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return count;
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}
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bool listed() const {
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return next!=0;
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}
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};
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template<class T> class xlist_head : public xlist<T>
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{
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public:
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xlist_head() {}
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T *first_obj() const { return xlist<T>::next_obj(); }
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};
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#define xlist_for_each(TYPE,list_head,node,obj) \
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TYPE *obj; \
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for(xlist<TYPE> *node=(list_head).get_next(); obj=node->get_obj(), node!=&list_head; node=node->get_next())
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#define xlist_for_each_safe(TYPE,list_head,node,obj,next) \
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TYPE *obj; \
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for(xlist<TYPE> *node=(list_head).get_next(), *next=node->get_next(); obj=node->get_obj(), node!=&list_head; node=next, next=node->get_next())
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#endif//XLIST_H
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