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/* Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB
This file is public domain and comes with NO WARRANTY of any kind */
/*
Code for handling dubble-linked lists in C
*/
#include "mysys_priv.h"
#include <my_list.h>
/* Add a element to start of list */
LIST *list_add(LIST *root, LIST *element)
{
DBUG_ENTER("list_add");
DBUG_PRINT("enter",("root: %lx element: %lx", root, element));
if (root)
{
if (root->prev) /* If add in mid of list */
root->prev->next= element;
element->prev=root->prev;
root->prev=element;
}
else
element->prev=0;
element->next=root;
DBUG_RETURN(element); /* New root */
}
LIST *list_delete(LIST *root, LIST *element)
{
if (element->prev)
element->prev->next=element->next;
else
root=element->next;
if (element->next)
element->next->prev=element->prev;
return root;
}
void list_free(LIST *root, pbool free_data)
{
LIST *next;
while (root)
{
next=root->next;
if (free_data)
my_free((gptr) root->data,MYF(0));
my_free((gptr) root,MYF(0));
root=next;
}
}
LIST *list_cons(void *data, LIST *list)
{
LIST *new_charset=(LIST*) my_malloc(sizeof(LIST),MYF(MY_FAE));
if (!new_charset)
return 0;
new_charset->data=data;
return list_add(list,new_charset);
}
LIST *list_reverse(LIST *root)
{
LIST *last;
last=root;
while (root)
{
last=root;
root=root->next;
last->next=last->prev;
last->prev=root;
}
return last;
}
uint list_length(LIST *list)
{
uint count;
for (count=0 ; list ; list=list->next, count++) ;
return count;
}
int list_walk(LIST *list, list_walk_action action, gptr argument)
{
int error=0;
while (list)
{
if ((error = (*action)(list->data,argument)))
return error;
list=rest(list);
}
return 0;
}
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