LIB$FFx

   The Find First Clear or Set Bit routines search the field
   specified by the start position, size, and base for the first
   clear or set bit. LIB$FFC and LIB$FFS make the VAX FFC and VAX
   FFS instructions available as callable routines.

   Format

     LIB$FFC  position ,size ,base ,find-position

     LIB$FFS  position ,size ,base ,find-position
 

Additional information available:

Returns         Arguments