X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/ed9b544e10b84cd43348ddfab7068b610a5df1f7..4774a53b:/adlist.c

diff --git a/adlist.c b/adlist.c
index 1f978c7b..015012f5 100644
--- a/adlist.c
+++ b/adlist.c
@@ -1,6 +1,6 @@
 /* adlist.c - A generic doubly linked list implementation
  *
- * Copyright (c) 2006-2009, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 2006-2010, Salvatore Sanfilippo <antirez at gmail dot com>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -123,6 +123,35 @@ list *listAddNodeTail(list *list, void *value)
     return list;
 }
 
+list *listInsertNode(list *list, listNode *old_node, void *value, int after) {
+    listNode *node;
+
+    if ((node = zmalloc(sizeof(*node))) == NULL)
+        return NULL;
+    node->value = value;
+    if (after) {
+        node->prev = old_node;
+        node->next = old_node->next;
+        if (list->tail == old_node) {
+            list->tail = node;
+        }
+    } else {
+        node->next = old_node;
+        node->prev = old_node->prev;
+        if (list->head == old_node) {
+            list->head = node;
+        }
+    }
+    if (node->prev != NULL) {
+        node->prev->next = node;
+    }
+    if (node->next != NULL) {
+        node->next->prev = node;
+    }
+    list->len++;
+    return list;
+}
+
 /* Remove the specified node from the specified list.
  * It's up to the caller to free the private value of the node.
  *
@@ -143,7 +172,7 @@ void listDelNode(list *list, listNode *node)
 }
 
 /* Returns a list iterator 'iter'. After the initialization every
- * call to listNextElement() will return the next element of the list.
+ * call to listNext() will return the next element of the list.
  *
  * This function can't fail. */
 listIter *listGetIterator(list *list, int direction)
@@ -164,6 +193,17 @@ void listReleaseIterator(listIter *iter) {
     zfree(iter);
 }
 
+/* Create an iterator in the list private iterator structure */
+void listRewind(list *list, listIter *li) {
+    li->next = list->head;
+    li->direction = AL_START_HEAD;
+}
+
+void listRewindTail(list *list, listIter *li) {
+    li->next = list->tail;
+    li->direction = AL_START_TAIL;
+}
+
 /* Return the next element of an iterator.
  * It's valid to remove the currently returned element using
  * listDelNode(), but not to remove other elements.
@@ -172,13 +212,13 @@ void listReleaseIterator(listIter *iter) {
  * or NULL if there are no more elements, so the classical usage patter
  * is:
  *
- * iter = listGetItarotr(list,<direction>);
- * while ((node = listNextIterator(iter)) != NULL) {
- *     DoSomethingWith(listNodeValue(node));
+ * iter = listGetIterator(list,<direction>);
+ * while ((node = listNext(iter)) != NULL) {
+ *     doSomethingWith(listNodeValue(node));
  * }
  *
  * */
-listNode *listNextElement(listIter *iter)
+listNode *listNext(listIter *iter)
 {
     listNode *current = iter->next;
 
@@ -211,7 +251,7 @@ list *listDup(list *orig)
     copy->free = orig->free;
     copy->match = orig->match;
     iter = listGetIterator(orig, AL_START_HEAD);
-    while((node = listNextElement(iter)) != NULL) {
+    while((node = listNext(iter)) != NULL) {
         void *value;
 
         if (copy->dup) {
@@ -248,7 +288,7 @@ listNode *listSearchKey(list *list, void *key)
     listNode *node;
 
     iter = listGetIterator(list, AL_START_HEAD);
-    while((node = listNextElement(iter)) != NULL) {
+    while((node = listNext(iter)) != NULL) {
         if (list->match) {
             if (list->match(node->value, key)) {
                 listReleaseIterator(iter);