1. UINTN & INTN issue for EBC architecture:

[mirror_edk2.git] / MdePkg / Library / UefiMemoryLib / ScanMem64Wrapper.c

diff --git a/MdePkg/Library/UefiMemoryLib/ScanMem64Wrapper.c b/MdePkg/Library/UefiMemoryLib/ScanMem64Wrapper.c
index c5f0762ebe69ee21eb757f9b5de19ca3a45a6c41..228c864b04e69f8f9299868c2cb695f5c4dc9319 100644 (file)
--- a/MdePkg/Library/UefiMemoryLib/ScanMem64Wrapper.c
+++ b/MdePkg/Library/UefiMemoryLib/ScanMem64Wrapper.c
@@ -26,25 +26,22 @@
 #include "MemLibInternals.h"\r
 \r
 /**\r
-  Scans a target buffer for a 64-bit value, and returns a pointer to the\r
-  matching 64-bit value in the target buffer.\r
+  Scans a target buffer for a 64-bit value, and returns a pointer to the matching 64-bit value\r
+  in the target buffer.\r
 \r
-  This function searches target the buffer specified by Buffer and Length from\r
-  the lowest address to the highest address at 64-bit increments for a 64-bit\r
-  value that matches Value. If a match is found, then a pointer to the matching\r
-  value in the target buffer is returned. If no match is found, then NULL is\r
-  returned. If Length is 0, then NULL is returned.\r
-\r
-  If Buffer is NULL, then ASSERT().\r
+  This function searches target the buffer specified by Buffer and Length from the lowest\r
+  address to the highest address for a 64-bit value that matches Value.  If a match is found,\r
+  then a pointer to the matching byte in the target buffer is returned.  If no match is found,\r
+  then NULL is returned.  If Length is 0, then NULL is returned.\r
+  If Length > 0 and Buffer is NULL, then ASSERT().\r
   If Buffer is not aligned on a 64-bit boundary, then ASSERT().\r
-  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
+  If Length is greater than (MAX_ADDRESS \96 Buffer + 1), then ASSERT(). \r
 \r
-  @param  Buffer  Pointer to the target buffer to scan.\r
-  @param  Length  Number of bytes in Buffer to scan.\r
-  @param  Value   Value to search for in the target buffer.\r
+  @param  Buffer      Pointer to the target buffer to scan.\r
+  @param  Length      Number of bytes in Buffer to scan.\r
+  @param  Value       Value to search for in the target buffer.\r
 \r
-  @return Pointer to the first occurrence or NULL if not found.\r
-  @retval NULL  if Length == 0 or Value was not found.\r
+  @return A pointer to the matching byte in the target buffer or NULL otherwise.\r
 \r
 **/\r
 VOID *\r
@@ -55,12 +52,13 @@ ScanMem64 (
   IN      UINT64                    Value\r
   )\r
 {\r
+  if (Length == 0) {\r
+    return NULL;\r
+  }\r
+\r
   ASSERT (Buffer != NULL);\r
   ASSERT (((UINTN)Buffer & (sizeof (Value) - 1)) == 0);\r
-  ASSERT (Length <= MAX_ADDRESS + (UINTN)Buffer + 1);\r
+  ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));\r
 \r
-  if ((Length /= sizeof (Value)) == 0) {\r
-    return NULL;\r
-  }\r
-  return (VOID*)InternalMemScanMem64 (Buffer, Length, Value);\r
+  return (VOID*)InternalMemScanMem64 (Buffer, Length / sizeof (Value), Value);\r
 }\r