248 lines
5.8 KiB
C
248 lines
5.8 KiB
C
/*
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* NeoIRCd: NeoStats Group. Based on Hybird7
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* tools.h: Header for the various tool functions.
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*
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* Copyright (C) 2002 by the past and present ircd coders, and others.
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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,v 1.6 2003/03/06 14:01:46 fishwaldo Exp $
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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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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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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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void
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dlinkAdd(void *data, dlink_node * m, dlink_list * list);
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void
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dlinkAddBefore(dlink_node *b, void *data, dlink_node *m, dlink_list *list);
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void
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dlinkAddTail(void *data, dlink_node *m, dlink_list *list);
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void
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dlinkDelete(dlink_node *m, dlink_list *list);
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void
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dlinkMoveList(dlink_list *from, dlink_list *to);
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dlink_node *
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dlinkFind(dlink_list *m, void *data);
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dlink_node *
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dlinkFindDelete(dlink_list *m, void *data);
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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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/* These 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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/*
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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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/* forte (and maybe others) dont like these being declared twice,
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* so we dont declare the inlines unless GNUC.
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*/
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#ifdef __GNUC__
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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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extern inline void
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dlinkAdd(void *data, dlink_node * m, dlink_list * list)
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{
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m->data = data;
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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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extern inline 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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/* Shortcut - if its the first one, call dlinkAdd only */
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if (b == list->head)
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dlinkAdd(data, m, list);
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else {
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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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extern inline void
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dlinkAddTail(void *data, dlink_node *m, dlink_list *list)
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{
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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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extern inline void
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dlinkDelete(dlink_node *m, dlink_list *list)
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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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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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/* Set this to NULL does matter */
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m->next = m->prev = NULL;
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list->length--;
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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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extern inline dlink_node *
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dlinkFind(dlink_list *list, void * data )
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{
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dlink_node *ptr;
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for (ptr = list->head; ptr; ptr = ptr->next)
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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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extern inline void
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dlinkMoveList(dlink_list *from, dlink_list *to)
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{
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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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/* actually if to->head is NULL and to->tail isn't, thats a bug */
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if(to->head == NULL) {
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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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from->head->prev = to->head->prev;
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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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/* I think I got that right */
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}
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extern inline dlink_node *
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dlinkFindDelete(dlink_list *list, void *data)
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{
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dlink_node *m;
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m = dlinkFind(list, data);
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if (m)
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dlinkDelete(m, list);
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return(m);
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}
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#endif /* __GNUC__ */
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#endif /* __TOOLS_H__ */
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