latest sources commit

deps/mysqllite/mysys/list.c

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+/* Copyright (C) 2000 MySQL AB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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: 0x%lx  element: 0x%lx", (long) root, (long) 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, uint 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, uchar* argument)
+{
+  int error=0;
+  while (list)
+  {
+    if ((error = (*action)(list->data,argument)))
+      return error;
+    list=list_rest(list);
+  }
+  return 0;
+}