1 files changed, 82 insertions, 0 deletions
diff --git a/src/VBox/Runtime/generic/RTEnvDupEx-generic.cpp b/src/VBox/Runtime/generic/RTEnvDupEx-generic.cpp
new file mode 100644
index 00000000..dddba8da
--- /dev/null
+++ b/src/VBox/Runtime/generic/RTEnvDupEx-generic.cpp
@@ -0,0 +1,82 @@
+/* $Id: RTEnvDupEx-generic.cpp $ */
+/** @file
+ * IPRT - Environment, RTEnvDupEx, generic.
+ */
+
+/*
+ * Copyright (C) 2010-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/env.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+#include <iprt/mem.h>
+
+
+
+RTDECL(char *) RTEnvDupEx(RTENV Env, const char *pszVar)
+{
+    /*
+     * Try with a small buffer.  This helps avoid allocating a heap buffer for
+     * variables that doesn't exist.
+     */
+    char szSmall[256];
+    int rc = RTEnvGetEx(Env, pszVar, szSmall, sizeof(szSmall), NULL);
+    if (RT_SUCCESS(rc))
+        return RTStrDup(szSmall);
+    if (rc != VERR_BUFFER_OVERFLOW)
+        return NULL;
+
+    /*
+     * It's a bug bugger.
+     */
+    size_t  cbBuf  = _1K;
+    char   *pszBuf = (char *)RTMemAlloc(cbBuf);
+    for (;;)
+    {
+        rc = RTEnvGetEx(Env, pszVar, pszBuf, cbBuf, NULL);
+        if (RT_SUCCESS(rc))
+            return pszBuf; /* ASSUMES RTMemAlloc can be freed by RTStrFree! */
+
+        if (rc != VERR_BUFFER_OVERFLOW)
+            break;
+
+        if (cbBuf >= 64 * _1M)
+            break;
+        cbBuf *= 2;
+
+        char *pszNew = (char *)RTMemRealloc(pszBuf, cbBuf);
+        if (!pszNew)
+            break;
+        pszBuf = pszNew;
+    }
+
+    RTMemFree(pszBuf);
+    return NULL;
+}
+RT_EXPORT_SYMBOL(RTEnvGetExecEnvP);
+