212380e3f4
+ branches/release-2.1 -> 2.2 base + 3.0 -> branches/cxxconversion + backport some immediate 3.0 functionality for 2.2 + other stuff
379 lines
8.2 KiB
C
379 lines
8.2 KiB
C
/*
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* ircd-ratbox: A slightly useful ircd.
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* tools.h: Header for the various tool functions.
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*
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* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
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* Copyright (C) 1996-2002 Hybrid Development Team
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* Copyright (C) 2002-2004 ircd-ratbox development team
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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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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* $Id: tools.h 382 2005-12-07 15:15:59Z nenolod $
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*/
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#ifndef __TOOLS_H__
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#define __TOOLS_H__
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/*
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* double-linked-list stuff
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*/
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typedef struct _dlink_node dlink_node;
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typedef struct _dlink_list dlink_list;
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struct _dlink_node
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{
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void *data;
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dlink_node *prev;
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dlink_node *next;
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};
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struct _dlink_list
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{
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dlink_node *head;
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dlink_node *tail;
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unsigned long length;
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};
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dlink_node *make_dlink_node(void);
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void free_dlink_node(dlink_node * lp);
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void init_dlink_nodes(void);
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#ifndef NDEBUG
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void mem_frob(void *data, int len);
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#else
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#define mem_frob(x, y)
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#endif
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/* This macros are basically swiped from the linux kernel
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* they are simple yet effective
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*/
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/*
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* Walks forward of a list.
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* pos is your node
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* head is your list head
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*/
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#define DLINK_FOREACH(pos, head) for (pos = (head); pos != NULL; pos = pos->next)
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/*
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* Walks forward of a list safely while removing nodes
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* pos is your node
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* n is another list head for temporary storage
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* head is your list head
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*/
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#define DLINK_FOREACH_SAFE(pos, n, head) for (pos = (head), n = pos ? pos->next : NULL; pos != NULL; pos = n, n = pos ? pos->next : NULL)
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#define DLINK_FOREACH_PREV(pos, head) for (pos = (head); pos != NULL; pos = pos->prev)
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/* Returns the list length */
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#define dlink_list_length(list) (list)->length
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#define dlink_move_list(oldlist, newlist, node)
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#define dlinkAddAlloc(data, list) dlinkAdd(data, make_dlink_node(), list)
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#define dlinkAddTailAlloc(data, list) dlinkAddTail(data, make_dlink_node(), list)
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#define dlinkDestroy(node, list) do { dlinkDelete(node, list); free_dlink_node(node); } while(0)
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/*
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* The functions below are included for the sake of inlining
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* hopefully this will speed up things just a bit
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*
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*/
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/*
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* dlink_ routines are stolen from squid, except for dlinkAddBefore,
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* which is mine.
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* -- adrian
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*/
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/* I hate C sometimes */
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#if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__
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#define INLINE_FUNC extern inline
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#define NEED_INLINES
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#else
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#undef INLINE_FUNC
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#define INLINE_FUNC
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#endif
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#ifdef TOOLS_C
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#undef INLINE_FUNC
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#define INLINE_FUNC
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#endif
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void dlinkMoveNode(dlink_node * m, dlink_list * oldlist, dlink_list * newlist);
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void dlinkAdd(void *data, dlink_node * m, dlink_list * list);
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void dlinkAddBefore(dlink_node * b, void *data, dlink_node * m, dlink_list * list);
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void dlinkMoveTail(dlink_node *m, dlink_list *list);
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void dlinkAddTail(void *data, dlink_node * m, dlink_list * list);
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void dlinkDelete(dlink_node * m, dlink_list * list);
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dlink_node *dlinkFindDelete(void *data, dlink_list *list);
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int dlinkFindDestroy(void *data, dlink_list *list);
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dlink_node *dlinkFind(void *data, dlink_list *list);
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void dlinkMoveList(dlink_list * from, dlink_list * to);
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unsigned int find_umode_slot(void);
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#if defined(NEED_INLINES) || defined(TOOLS_C)
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INLINE_FUNC void
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dlinkMoveNode(dlink_node * m, dlink_list * oldlist, dlink_list * newlist)
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{
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/* Assumption: If m->next == NULL, then list->tail == m
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* and: If m->prev == NULL, then list->head == m
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*/
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assert(m != NULL);
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assert(oldlist != NULL);
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assert(newlist != NULL);
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if(m->next)
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m->next->prev = m->prev;
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else
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oldlist->tail = m->prev;
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if(m->prev)
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m->prev->next = m->next;
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else
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oldlist->head = m->next;
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m->prev = NULL;
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m->next = newlist->head;
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if(newlist->head != NULL)
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newlist->head->prev = m;
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else if(newlist->tail == NULL)
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newlist->tail = m;
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newlist->head = m;
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oldlist->length--;
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newlist->length++;
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}
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INLINE_FUNC void
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dlinkAdd(void *data, dlink_node * m, dlink_list * list)
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{
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assert(data != NULL);
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assert(m != NULL);
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assert(list != NULL);
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m->data = data;
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m->prev = NULL;
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m->next = list->head;
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/* Assumption: If list->tail != NULL, list->head != NULL */
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if(list->head != NULL)
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list->head->prev = m;
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else if(list->tail == NULL)
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list->tail = m;
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list->head = m;
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list->length++;
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}
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INLINE_FUNC void
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dlinkAddBefore(dlink_node * b, void *data, dlink_node * m, dlink_list * list)
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{
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assert(b != NULL);
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assert(data != NULL);
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assert(m != NULL);
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assert(list != NULL);
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/* Shortcut - if its the first one, call dlinkAdd only */
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if(b == list->head)
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{
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dlinkAdd(data, m, list);
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}
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else
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{
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m->data = data;
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b->prev->next = m;
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m->prev = b->prev;
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b->prev = m;
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m->next = b;
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list->length++;
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}
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}
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INLINE_FUNC void
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dlinkMoveTail(dlink_node *m, dlink_list *list)
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{
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if(list->tail == m)
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return;
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/* From here assume that m->next != NULL as that can only
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* be at the tail and assume that the node is on the list
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*/
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m->next->prev = m->prev;
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if(m->prev != NULL)
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m->prev->next = m->next;
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else
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list->head = m->next;
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list->tail->next = m;
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m->prev = list->tail;
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m->next = NULL;
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list->tail = m;
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}
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INLINE_FUNC void
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dlinkAddTail(void *data, dlink_node * m, dlink_list * list)
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{
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assert(m != NULL);
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assert(list != NULL);
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assert(data != NULL);
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m->data = data;
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m->next = NULL;
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m->prev = list->tail;
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/* Assumption: If list->tail != NULL, list->head != NULL */
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if(list->tail != NULL)
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list->tail->next = m;
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else if(list->head == NULL)
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list->head = m;
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list->tail = m;
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list->length++;
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}
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/* Execution profiles show that this function is called the most
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* often of all non-spontaneous functions. So it had better be
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* efficient. */
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INLINE_FUNC void
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dlinkDelete(dlink_node * m, dlink_list * list)
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{
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assert(m != NULL);
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assert(list != NULL);
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/* Assumption: If m->next == NULL, then list->tail == m
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* and: If m->prev == NULL, then list->head == m
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*/
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if(m->next)
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m->next->prev = m->prev;
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else
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list->tail = m->prev;
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if(m->prev)
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m->prev->next = m->next;
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else
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list->head = m->next;
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m->next = m->prev = NULL;
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list->length--;
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}
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INLINE_FUNC dlink_node *
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dlinkFindDelete(void *data, dlink_list *list)
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{
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dlink_node *m;
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assert(list != NULL);
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assert(data != NULL);
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DLINK_FOREACH(m, list->head)
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{
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if(m->data != data)
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continue;
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if(m->next)
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m->next->prev = m->prev;
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else
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list->tail = m->prev;
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if(m->prev)
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m->prev->next = m->next;
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else
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list->head = m->next;
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m->next = m->prev = NULL;
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list->length--;
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return m;
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}
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return NULL;
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}
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INLINE_FUNC int
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dlinkFindDestroy(void *data, dlink_list *list)
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{
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void *ptr;
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assert(list != NULL);
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assert(data != NULL);
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ptr = dlinkFindDelete(data, list);
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if(ptr != NULL)
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{
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free_dlink_node(ptr);
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return 1;
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}
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return 0;
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}
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/*
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* dlinkFind
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* inputs - list to search
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* - data
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* output - pointer to link or NULL if not found
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* side effects - Look for ptr in the linked listed pointed to by link.
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*/
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INLINE_FUNC dlink_node *
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dlinkFind(void *data, dlink_list *list)
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{
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dlink_node *ptr;
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assert(list != NULL);
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assert(data != NULL);
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DLINK_FOREACH(ptr, list->head)
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{
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if(ptr->data == data)
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return (ptr);
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}
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return (NULL);
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}
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INLINE_FUNC void
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dlinkMoveList(dlink_list * from, dlink_list * to)
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{
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assert(from != NULL);
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assert(to != NULL);
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/* There are three cases */
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/* case one, nothing in from list */
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if(from->head == NULL)
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return;
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/* case two, nothing in to list */
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if(to->head == NULL)
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{
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to->head = from->head;
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to->tail = from->tail;
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from->head = from->tail = NULL;
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to->length = from->length;
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from->length = 0;
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return;
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}
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/* third case play with the links */
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from->tail->next = to->head;
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to->head->prev = from->tail;
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to->head = from->head;
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from->head = from->tail = NULL;
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to->length += from->length;
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from->length = 0;
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}
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#endif
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#endif /* __TOOLS_H__ */
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