From: Michael Kubacki <michael.kubacki@microsoft.com>
REF:https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.tianocore.org%2Fshow_bug.cgi%3Fid%3D1959&data=02%7C01%7CBret.Barkelew%40microsoft.com%7C94961c566a924c5b25ec08d7dd8a20bc%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637221457630835410&sdata=HmJaCO%2BcGBU51%2BU1e1D7I3WN0x4PRq9LhH9d9hOBo4s%3D&reserved=0
The macros EFI_LIST_FOR_EACH and EFI_LIST_FOR_EACH_SAFE have been
duplicated across several drivers. These macros have proven useful and
established a commonly used pattern for linked list iteration.
This change defines the macros in BaseLib.h alongside other generic linked
list macros and functions.
Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Guomin Jiang <guomin.jiang@intel.com>
---
MdePkg/Include/Library/BaseLib.h | 27 ++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/BaseLib.h
index ecadff8b235e..d066f1be2495 100644
--- a/MdePkg/Include/Library/BaseLib.h
+++ b/MdePkg/Include/Library/BaseLib.h
@@ -4,6 +4,7 @@
Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+Copyright (c) Microsoft Corporation.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
@@ -2972,6 +2973,32 @@ PathCleanUpDirectories(
**/
#define INITIALIZE_LIST_HEAD_VARIABLE(ListHead) {&(ListHead), &(ListHead)}
+/**
+ Iterates over each node in a doubly linked list using each node's forward link.
+
+ @param Entry A pointer to a list node used as a loop cursor during iteration
+ @param ListHead The head node of the doubly linked list
+
+**/
+#define BASE_LIST_FOR_EACH(Entry, ListHead) \
+ for(Entry = (ListHead)->ForwardLink; Entry != (ListHead); Entry = Entry->ForwardLink)
+
+/**
+ Iterates over each node in a doubly linked list using each node's forward link
+ with safety against node removal.
+
+ This macro uses NextEntry to temporarily store the next list node so the node
+ pointed to by Entry may be deleted in the current loop iteration step and
+ iteration can continue from the node pointed to by NextEntry.
+
+ @param Entry A pointer to a list node used as a loop cursor during iteration
+ @param NextEntry A pointer to a list node used to temporarily store the next node
+ @param ListHead The head node of the doubly linked list
+
+**/
+#define BASE_LIST_FOR_EACH_SAFE(Entry, NextEntry, ListHead) \
+ for(Entry = (ListHead)->ForwardLink, NextEntry = Entry->ForwardLink;\
+ Entry != (ListHead); Entry = NextEntry, NextEntry = Entry->ForwardLink)
/**
Checks whether FirstEntry and SecondEntry are part of the same doubly-linked
--
2.16.3.windows.1