Use osl_getEnvironment instead of getenv

Avoids conversion to OUString; and is Unicode-safe on Windows.

Change-Id: If4f76f867f988d43ec4dae0a8e09f1390fee42e8
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/183503
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Jenkins

cppuhelper/source/servicemanager.cxx

@@ -42,6 +42,7 @@
 #include <o3tl/safeint.hxx>
 #include <osl/file.hxx>
 #include <osl/module.hxx>
+#include <osl/process.h>
 #include <rtl/ref.hxx>
 #include <rtl/uri.hxx>
 #include <rtl/ustring.hxx>
@@ -1826,10 +1827,10 @@ void cppuhelper::ServiceManager::preloadImplementations() {
     OUStringBuffer aMissingMsg;
 
     /// Allow external callers & testers to disable certain components
-    const char *pDisable = getenv("UNODISABLELIBRARY");
-    if (pDisable)
+    if (OUString aDisable;
+        osl_getEnvironment(u"UNODISABLELIBRARY"_ustr.pData, &aDisable.pData) == osl_Process_E_None
+        && !aDisable.isEmpty())
     {
-        OUString aDisable(pDisable, strlen(pDisable), RTL_TEXTENCODING_UTF8);
         for (sal_Int32 i = 0; i >= 0; )
         {
             OUString tok( aDisable.getToken(0, ' ', i) );

framework/source/services/substitutepathvars.cxx

@@ -26,6 +26,7 @@
 #include <unotools/bootstrap.hxx>
 #include <unotools/configmgr.hxx>
 #include <osl/file.hxx>
+#include <osl/process.h>
 #include <osl/security.hxx>
 #include <osl/thread.hxx>
 #include <i18nlangtag/languagetag.hxx>
@@ -299,13 +300,13 @@ OUString SubstitutePathVariables::GetHomeVariableValue()
 OUString SubstitutePathVariables::GetPathVariableValue()
 {
     OUString aRetStr;
-    const char* pEnv = getenv( "PATH" );
+    OUString aPathList;
 
-    if ( pEnv )
+    if (osl_getEnvironment(u"PATH"_ustr.pData, &aPathList.pData) == osl_Process_E_None
+        && !aPathList.isEmpty())
     {
         const int PATH_EXTEND_FACTOR = 200;
         OUString       aTmp;
-        OUString       aPathList( pEnv, strlen( pEnv ), osl_getThreadTextEncoding() );
         OUStringBuffer aPathStrBuffer( aPathList.getLength() * PATH_EXTEND_FACTOR / 100 );
 
         bool      bAppendSep = false;