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115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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2016 MariaDB Corporation AB
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02111-1301, 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 <ma_global.h>
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#include <ma_sys.h>
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#include <ma_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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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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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, unsigned int 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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free(root->data);
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free(root);
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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*) malloc(sizeof(LIST));
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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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