Error Handling

HI
I am porting a database from MS SQL Server to Postgres.
One of the problems I have is how to get error information resulted from running a stored procedure.
The attached code does not run in Postgres , I need equivalents to the following MS SQL Server functions:
 
ERROR_NUMBER()
ERROR_SEVERITY();
ERROR_STATE();
ERROR_LINE();
ERROR_PROCEDURE()

Thanks for your help.

CREATE OR REPLACE FUNCTION rethrowerror()
  RETURNS void AS
$BODY$
   DECLARE
   v_ErrorMessage  VARCHAR(4000);
   v_ErrorNumber  TEXT;
   v_ErrorSeverity  INTEGER;
   v_ErrorState  INTEGER;
   v_ErrorLine  INTEGER;
   v_ErrorProcedure  VARCHAR(200);
BEGIN
   IF 'Error' /*NOT SUPPORTED ERROR_NUMBER()*/IS NULL then
      RETURN;
   end if;
     
    /* Assign variables to error-handling functions that
       capture information for RAISERROR. */

   v_ErrorNumber := 'Error' /*NOT SUPPORTED ERROR_NUMBER()*/;
   v_ErrorSeverity := ERROR_SEVERITY();
   v_ErrorState := ERROR_STATE();
   v_ErrorLine := ERROR_LINE();
   v_ErrorProcedure := coalesce(ERROR_PROCEDURE(),'-'); 

    /* Building the message string that will contain original
       error information. */

   v_ErrorMessage := N'Error %d, Level %d, State %d, Procedure %s, Line %d, ' ||
   'Message: ' || 'Error'; 
   RAISE EXCEPTION '% % % % % % ',v_ErrorMessage,v_ErrorNumber,v_ErrorSeverity,v_ErrorState,v_ErrorProcedure,
   v_ErrorLine;
END; $BODY$

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