From 03a1a9c95759bb1af410b492dfe7218e12b721ea Mon Sep 17 00:00:00 2001
From: Bommels05 <69975756+Bommels05@users.noreply.github.com>
Date: Mon, 23 Mar 2026 15:11:08 +0100
Subject: [PATCH] Add simple logging

---
 CMakeLists.txt |  3 +++
 common.h       | 21 +++++++++++++++++++++
 kernel32.c     |  8 ++++++--
 log.c          | 34 ++++++++++++++++++++++++++++++++++
 logtest.c      |  7 +++++++
 5 files changed, 71 insertions(+), 2 deletions(-)
 create mode 100644 log.c
 create mode 100644 logtest.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 146e6a1..503059f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,6 +12,9 @@ set(CMAKE_CXX_STANDARD 20)
 add_executable(bconfig config.c config.rc)
 target_link_libraries(bconfig comctl32)
 
+add_executable(blog log.c)
+add_executable(blogtest logtest.c)
+
 if (CMAKE_SIZEOF_VOID_P EQUAL 4)
     add_library(user32 SHARED user32.c)
     target_link_libraries(user32 -static-libgcc)
diff --git a/common.h b/common.h
index 22fbb20..27bbf89 100644
--- a/common.h
+++ b/common.h
@@ -11,4 +11,25 @@
 
 #define getFunction(dllName, functionName) GetProcAddress(GetModuleHandleA(dllName), functionName)
 
+#ifndef DLL_NAME
+#define DLL_NAME "Unknown"
+#endif
+
+void logMSG(LPCSTR msg, LPCSTR level) {
+    char buffer[512];
+    char name[128];
+    GetModuleFileName(NULL, name, sizeof(name));
+
+    typedef int (__cdecl *sprintfPtr)(char* stream, const char* format, ...);
+    sprintfPtr sprintf = (sprintfPtr) getFunction("msvcrt.dll", "sprintf");
+    sprintf(buffer, "[%s] [%s | %s] %s", level, name, DLL_NAME, msg);
+
+    CallNamedPipe(TEXT("\\\\.\\pipe\\bcompat"), buffer, sizeof(buffer), NULL, 0, NULL, NMPWAIT_NOWAIT);
+}
+
+#define logDebug(msg) logMSG(msg, "DEBUG");
+#define logInfo(msg) logMSG(msg, "INFO");
+#define logWarn(msg) logMSG(msg, "WARN");
+#define logError(msg) logMSG(msg, "ERROR");
+
 #endif //BCOMPAT_COMMON_H
\ No newline at end of file
diff --git a/kernel32.c b/kernel32.c
index c113c16..1158524 100644
--- a/kernel32.c
+++ b/kernel32.c
@@ -1,5 +1,7 @@
+#define DLL_NAME "kernel32.dll"
 #include "common.h"
 #include "kernel32.h"
+#include <tlhelp32.h>
 
 typedef LPWCH (__cdecl *wcscpyPtr)(LPWCH dest, LPWCH source);
 typedef size_t (__cdecl *wcstombsPtr)(LPSTR dest, LPWCH source, size_t maxCount);
@@ -8,14 +10,13 @@ typedef LONG (WINAPI *RegQueryValueExWPtr)(HKEY hKey, LPCWSTR lpValueName, LPDWO
 typedef LONG (WINAPI *RegCloseKeyPtr)(HKEY hKey);
 
 DLL_EXPORT WINAPI BOOL GetVersionExW(LPOSVERSIONINFOW version) {
+    logDebug("GetVersionEx: Wrapping Call")
     if (version->dwOSVersionInfoSize == sizeof(OSVERSIONINFOW)) {
         version->dwMajorVersion = 4;
         version->dwMinorVersion = 0;
         version->dwBuildNumber = 1381;
         version->dwPlatformId = VER_PLATFORM_WIN32_NT;
         version->szCSDVersion[0] = L'\0';
-        //wcscpyPtr wcscpy = (wcscpyPtr) getFunction("msvcrt.dll", "wcscpy");
-        //wcscpy(version->szCSDVersion, L"Befator Inc gruesst Sie!");
 
         RegOpenKeyExWPtr regOpenKeyExW = (RegOpenKeyExWPtr) getFunction("advapi32.dll", "RegOpenKeyExW");
         RegQueryValueExWPtr regQueryValueExW = (RegQueryValueExWPtr) getFunction("advapi32.dll", "RegQueryValueExW");
@@ -47,6 +48,7 @@ DLL_EXPORT WINAPI BOOL GetVersionExW(LPOSVERSIONINFOW version) {
         }
         return TRUE;
     } else {
+        logWarn("GetVersionExW: Invalid Buffer Size")
         SetLastError(ERROR_INSUFFICIENT_BUFFER);
         return FALSE;
     }
@@ -68,12 +70,14 @@ DLL_EXPORT WINAPI BOOL GetVersionExA(LPOSVERSIONINFOA version) {
         }
         return FALSE;
     } else {
+        logWarn("GetVersionExA: Invalid Buffer Size")
         SetLastError(ERROR_INSUFFICIENT_BUFFER);
         return FALSE;
     }
 }
 
 DLL_EXPORT WINAPI DWORD GetVersion() {
+    logDebug("GetVersion: Legacy Function called")
     OSVERSIONINFOW versionW;
     if (GetVersionExW(&versionW)) {
         return (versionW.dwPlatformId ^ 2) << 30 |
diff --git a/log.c b/log.c
new file mode 100644
index 0000000..b352421
--- /dev/null
+++ b/log.c
@@ -0,0 +1,34 @@
+#include <windows.h>
+
+//From msvcrt.dll
+int __declspec(dllimport) __cdecl printf (const char* format, ...);
+int __declspec(dllimport) __cdecl sprintf (char* stream, const char* format, ...);
+
+int main() {
+    HANDLE pipe = CreateNamedPipe(TEXT("\\\\.\\pipe\\bcompat"), PIPE_ACCESS_DUPLEX,
+        PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE, 1, 512, 512, 0, NULL);
+    if (pipe == INVALID_HANDLE_VALUE) {
+        DWORD error = GetLastError();
+        if (error == ERROR_ACCESS_DENIED) {
+            MessageBox(NULL, TEXT("Another instance is already running"), TEXT("BCompat Log"), MB_OK | MB_ICONERROR);
+        } else {
+            TCHAR buffer[128];
+            sprintf(buffer, TEXT("Error opening logging pipe: 0x%lx"), error);
+            MessageBox(NULL, buffer, TEXT("BCompat Log"), MB_OK | MB_ICONERROR);
+        }
+        return -1;
+    }
+
+    while (TRUE) {
+        if (ConnectNamedPipe(pipe, NULL) || GetLastError() == ERROR_PIPE_CONNECTED) {
+            char buffer[512];
+            DWORD read;
+            if (ReadFile(pipe, buffer, sizeof(buffer), &read, NULL)) {
+                printf("%s\n", buffer);
+            }
+            DisconnectNamedPipe(pipe);
+        }
+    }
+
+    CloseHandle(pipe);
+}
\ No newline at end of file
diff --git a/logtest.c b/logtest.c
new file mode 100644
index 0000000..cb3cb03
--- /dev/null
+++ b/logtest.c
@@ -0,0 +1,7 @@
+#define DLL_NAME "blogtest.exe"
+#include "common.h"
+
+int main() {
+    logError("main: Test!");
+    return GetLastError();
+}