1 files changed, 94 insertions, 0 deletions
diff --git a/src/VBox/Additions/common/VBoxGuest/lib/VBoxGuestR3LibLog.cpp b/src/VBox/Additions/common/VBoxGuest/lib/VBoxGuestR3LibLog.cpp
new file mode 100644
index 00000000..ef4eee8f
--- /dev/null
+++ b/src/VBox/Additions/common/VBoxGuest/lib/VBoxGuestR3LibLog.cpp
@@ -0,0 +1,94 @@
+/* $Id: VBoxGuestR3LibLog.cpp $ */
+/** @file
+ * VBoxGuestR3Lib - Ring-3 Support Library for VirtualBox guest additions, Logging.
+ */
+
+/*
+ * Copyright (C) 2007-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/err.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+#include "VBoxGuestR3LibInternal.h"
+
+
+/**
+ * Write to the backdoor logger from ring 3 guest code.
+ *
+ * @returns IPRT status code.
+ *
+ * @param   pch     The string to log.  Does not need to be terminated.
+ * @param   cch     The number of chars (bytes) to log.
+ *
+ * @remarks This currently does not accept more than 255 bytes of data at
+ *          one time. It should probably be rewritten to use pass a pointer
+ *          in the IOCtl.
+ */
+VBGLR3DECL(int) VbglR3WriteLog(const char *pch, size_t cch)
+{
+    /*
+     * Quietly skip empty strings.
+     * (Happens in the RTLogBackdoorPrintf case.)
+     */
+    int rc;
+    if (cch > 0)
+    {
+        if (RT_VALID_PTR(pch))
+        {
+            /*
+             * We need to repackage the string for ring-0.
+             */
+            size_t      cbMsg = VBGL_IOCTL_LOG_SIZE(cch);
+            PVBGLIOCLOG pMsg  = (PVBGLIOCLOG)RTMemTmpAlloc(cbMsg);
+            if (pMsg)
+            {
+                VBGLREQHDR_INIT_EX(&pMsg->Hdr, VBGL_IOCTL_LOG_SIZE_IN(cch), VBGL_IOCTL_LOG_SIZE_OUT);
+                memcpy(pMsg->u.In.szMsg, pch, cch);
+                pMsg->u.In.szMsg[cch] = '\0';
+                rc = vbglR3DoIOCtl(VBGL_IOCTL_LOG(cch), &pMsg->Hdr, cbMsg);
+
+                RTMemTmpFree(pMsg);
+            }
+            else
+                rc = VERR_NO_TMP_MEMORY;
+        }
+        else
+            rc = VERR_INVALID_POINTER;
+    }
+    else
+        rc = VINF_SUCCESS;
+    return rc;
+}
+