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116 lines
2.4 KiB
C
116 lines
2.4 KiB
C
/* Copyright (C) 2000 MySQL AB
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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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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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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 USA */
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/*
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Code for handling dubble-linked lists in C
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*/
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#include "mysys_priv.h"
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#include <my_list.h>
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/* Add a element to start of list */
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LIST *list_add(LIST *root, LIST *element)
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{
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DBUG_ENTER("list_add");
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DBUG_PRINT("enter",("root: 0x%lx element: 0x%lx", root, element));
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if (root)
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{
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if (root->prev) /* If add in mid of list */
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root->prev->next= element;
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element->prev=root->prev;
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root->prev=element;
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}
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else
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element->prev=0;
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element->next=root;
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DBUG_RETURN(element); /* New root */
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}
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LIST *list_delete(LIST *root, LIST *element)
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{
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if (element->prev)
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element->prev->next=element->next;
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else
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root=element->next;
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if (element->next)
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element->next->prev=element->prev;
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return root;
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}
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void list_free(LIST *root, uint free_data)
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{
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LIST *next;
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while (root)
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{
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next=root->next;
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if (free_data)
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my_free((gptr) root->data,MYF(0));
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my_free((gptr) root,MYF(0));
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root=next;
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}
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}
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LIST *list_cons(void *data, LIST *list)
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{
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LIST *new_charset=(LIST*) my_malloc(sizeof(LIST),MYF(MY_FAE));
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if (!new_charset)
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return 0;
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new_charset->data=data;
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return list_add(list,new_charset);
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}
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LIST *list_reverse(LIST *root)
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{
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LIST *last;
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last=root;
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while (root)
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{
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last=root;
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root=root->next;
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last->next=last->prev;
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last->prev=root;
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}
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return last;
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}
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uint list_length(LIST *list)
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{
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uint count;
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for (count=0 ; list ; list=list->next, count++) ;
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return count;
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}
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int list_walk(LIST *list, list_walk_action action, gptr argument)
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{
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int error=0;
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while (list)
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{
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if ((error = (*action)(list->data,argument)))
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return error;
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list=list_rest(list);
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}
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return 0;
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}
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