mirror of
https://github.com/VCMP-SqMod/SqMod.git
synced 2024-11-12 18:57:16 +01:00
117 lines
2.4 KiB
C
117 lines
2.4 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2 of the License, or (at your option) any later version.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with this library; if not, write to the Free
|
|
Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
|
MA 02111-1301, USA */
|
|
|
|
/*
|
|
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, unsigned int free_data)
|
|
{
|
|
LIST *next;
|
|
while (root)
|
|
{
|
|
next=root->next;
|
|
if (free_data)
|
|
my_free(root->data);
|
|
my_free(root);
|
|
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;
|
|
}
|