Description

   The LBR$SEARCH routine searches the library index for symbols
   with the given RFA and calls the supplied routine with those
   symbols.

   Use LBR$SEARCH to find index keys that point to the same module
   header. Generally, in index number 1 (the module name table),
   just one key points to any particular module; thus, you would
   probably use this routine only to search library indexes where
   more than one key points to a module. For example, you might call
   LBR$SEARCH to find all the symbols in the symbol index that are
   associated with an object module in an object library.

   If LBR$SEARCH finds an index key associated with the specified
   RFA, it calls a user-supplied routine with two arguments:

   o  The key argument, which is the address of either of the
      following items:

      -  A string descriptor for the key name (libraries with ASCII
         key names)

      -  An unsigned longword for the key value (libraries with
         binary keys)

   o  The RFA argument, which is the address of a 2-longword array
      containing the RFA of the module header

   o  The key's type, whose flag bits are as follows:

      Flag Bits               Description

      LBR$M_SYM_WEAK = 1      UNIX-style weak symbol attribute
      LBR$M_SYM_GROUP = 2     Group symbol attribute

   The user routine must return a value to indicate success or
   failure. If the specified user routine returns a false value
   (low bit = 0), then the index search terminates.

   Note that the key found by LBR$SEARCH is valid only during the
   call to the user-supplied routine. If you want to use the key
   later, you must copy it.