From 7d2277a1ea600df119f8df1791b4634e1bef1bcd Mon Sep 17 00:00:00 2001
From: Amine Khaldi <amine.khaldi@reactos.org>
Date: Sat, 19 Feb 2011 21:24:47 +0000
Subject: [PATCH] [EVENTVWR] - Fix handling of NULL lpComputerName. - Handle
 lpData conversion to a wide string and make sure it's NULL terminated. -
 Patch by Rafal Harabien, <rafalh1992 AT o2 DOT pl> See issue #5926 for more
 details.

svn path=/trunk/; revision=50822
---
 .../applications/mscutils/eventvwr/eventvwr.c | 26 +++++++++++++++----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/reactos/base/applications/mscutils/eventvwr/eventvwr.c b/reactos/base/applications/mscutils/eventvwr/eventvwr.c
index bed476d1211..6a116ac3d00 100644
--- a/reactos/base/applications/mscutils/eventvwr/eventvwr.c
+++ b/reactos/base/applications/mscutils/eventvwr/eventvwr.c
@@ -503,11 +503,12 @@ QueryEventMessages(LPWSTR lpMachineName,
     HWND hwndDlg;
     HANDLE hEventLog;
     EVENTLOGRECORD *pevlr;
-    DWORD dwRead, dwNeeded, dwThisRecord, dwTotalRecords = 0, dwCurrentRecord = 1, dwRecordsToRead = 0, dwFlags;
+    DWORD dwRead, dwNeeded, dwThisRecord, dwTotalRecords = 0, dwCurrentRecord = 1, dwRecordsToRead = 0, dwFlags, dwMaxLength;
     LPWSTR lpSourceName;
     LPWSTR lpComputerName;
-    LPWSTR lpData;
+    LPSTR lpData;
     BOOL bResult = TRUE; /* Read succeeded. */
+    int i;
 
     WCHAR szWindowTitle[MAX_PATH];
     WCHAR szStatusText[MAX_PATH];
@@ -519,6 +520,7 @@ QueryEventMessages(LPWSTR lpMachineName,
     WCHAR szUsername[MAX_PATH];
     WCHAR szEventText[EVENT_MESSAGE_FILE_BUFFER];
     WCHAR szCategory[MAX_PATH];
+    WCHAR szData[MAX_PATH];
 
     SYSTEMTIME time;
     LVITEMW lviEventItem;
@@ -606,7 +608,7 @@ QueryEventMessages(LPWSTR lpMachineName,
             lpComputerName = (LPWSTR)((LPBYTE)pevlr + sizeof(EVENTLOGRECORD) + (wcslen(lpSourceName) + 1) * sizeof(WCHAR));
 
             // This ist the data section of the current event
-            lpData = (LPWSTR)((LPBYTE)pevlr + pevlr->DataOffset);
+            lpData = (LPSTR)((LPBYTE)pevlr + pevlr->DataOffset);
 
             // Compute the event type
             EventTimeToSystemTime(pevlr->TimeWritten, &time);
@@ -665,7 +667,13 @@ QueryEventMessages(LPWSTR lpMachineName,
             ListView_SetItemText(hwndListView, lviEventItem.iItem, 5, szEventID);
             ListView_SetItemText(hwndListView, lviEventItem.iItem, 6, szUsername); //User
             ListView_SetItemText(hwndListView, lviEventItem.iItem, 7, lpComputerName); //Computer
-            ListView_SetItemText(hwndListView, lviEventItem.iItem, 8, lpData); //Event Text
+            MultiByteToWideChar(CP_ACP,
+                                0,
+                                lpData,
+                                pevlr->DataLength,
+                                szData,
+                                MAX_PATH);
+            ListView_SetItemText(hwndListView, lviEventItem.iItem, 8, szData); //Event Text
 
             dwRead -= pevlr->Length;
             pevlr = (EVENTLOGRECORD *)((LPBYTE) pevlr + pevlr->Length);
@@ -678,7 +686,15 @@ QueryEventMessages(LPWSTR lpMachineName,
     // All events loaded
     EndDialog(hwndDlg, 0);
 
-    swprintf(szWindowTitle, L"%s - %s Log on \\\\%s", szTitle, lpLogName, lpComputerName);
+
+    i = swprintf(szWindowTitle, L"%s - %s Log on \\\\", szTitle, lpLogName); /* i = number of characters written */
+    /* lpComputerName can be NULL here if no records was read */
+    dwMaxLength = sizeof(szWindowTitle)/sizeof(WCHAR)-i;
+    if(!lpComputerName)
+        GetComputerNameW(szWindowTitle+i, &dwMaxLength);
+    else
+        _snwprintf(szWindowTitle+i, dwMaxLength, L"%s", lpComputerName);
+
     swprintf(szStatusText, L"%s has %d event(s)", lpLogName, dwTotalRecords);
 
     // Update the status bar