Fix for making absolute the registry arguments of the uno executable

a25bec0c "Properly absolutize all registry
arguments of uno executable" at least broke testtools/CustomTarget_uno_test.mk
on Windows, where some -ro argument system path starting with a drive letter
("C:/...") is passed in, which rtl::Uri::convertRelToAbs mis-interprets as a
URI with scheme "c".

Switching to osl::FileBase::getAbsoluteFileURL started to break Linux, where
osl_getAbsoluteFileURL for whatever reason calls
osl::FileBase::getSystemPathFromFileURL, which in turn for whetever reason
rejects relative input that starts with "/".  The easiest fix that appears not
to break anything else appears to be the workaround now added to
osl_getAbsoluteFileURL.

Change-Id: If03e7136ecc2c26a8f31e591257b1886f3ab129b

cpputools/source/unoexe/unoexe.cxx

@@ -29,7 +29,6 @@
 #include <rtl/process.h>
 #include <rtl/string.h>
 #include <rtl/strbuf.hxx>
-#include <rtl/uri.hxx>
 #include <rtl/ustrbuf.hxx>
 
 #include <uno/environment.h>
@@ -84,12 +83,13 @@ static OUString convertToFileUrl(const OUString& fileName)
     if (osl_getProcessWorkingDir(&uWorkingDir.pData) != osl_Process_E_None) {
         OSL_ASSERT(false);
     }
-    if (!uWorkingDir.isEmpty()
-        && uWorkingDir[uWorkingDir.getLength() - 1] != '/')
+    OUString uUrlFileName;
+    if (FileBase::getAbsoluteFileURL(uWorkingDir, fileName, uUrlFileName)
+        != FileBase::E_None)
     {
-        uWorkingDir += "/";
+        OSL_ASSERT(false);
     }
-    return rtl::Uri::convertRelToAbs(uWorkingDir, fileName);
+    return uUrlFileName;
 }
 
 static sal_Bool s_quiet = false;
@@ -334,13 +334,6 @@ static Reference< XSimpleRegistry > openRegistry(
         out( ": " );
         out( e.Message );
     }
-    catch (rtl::MalformedUriException & e)
-    {
-        out( "\n> warning: cannot open registry " );
-        out( rURL );
-        out( ": " );
-        out( e.getMessage() );
-    }
 
     return Reference< XSimpleRegistry >();
 }

sal/osl/unx/file_url.cxx

@@ -675,10 +675,20 @@ namespace /* private */
 
 oslFileError osl_getAbsoluteFileURL(rtl_uString*  ustrBaseDirURL, rtl_uString* ustrRelativeURL, rtl_uString** pustrAbsoluteURL)
 {
+    // Work around the below call to getSystemPathFromFileURL rejecting input
+    // that starts with "/" (for whatever reason it behaves that way; but
+    // changing that would start to break lots of tests at least):
+    rtl::OUString relUrl(ustrRelativeURL);
+    if (relUrl.startsWith("//")) {
+        relUrl = "file:" + relUrl;
+    } else if (relUrl.startsWith("/")) {
+        relUrl = "file://" + relUrl;
+    }
+
     FileBase::RC  rc;
     rtl::OUString unresolved_path;
 
-    rc = FileBase::getSystemPathFromFileURL(rtl::OUString(ustrRelativeURL), unresolved_path);
+    rc = FileBase::getSystemPathFromFileURL(relUrl, unresolved_path);
 
     if(FileBase::E_None != rc)
         return oslFileError(rc);