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Documentation changes (new: The Input Stream (gforth), Stack growth
direction (Vmgen)

    1: \ string comparisons
    2: 
    3: \ This file is in the public domain. NO WARRANTY.
    4: 
    5: \ Uses of COMPARE can be replaced with STR=, STRING-PREFIX?, and STR<
    6: \ (and these can be implemented more efficiently and used more easily
    7: \ than COMPARE).  See <news:2002Aug12.110229@a0.complang.tuwien.ac.at>
    8: \ and following.
    9: 
   10: s" gforth" environment? [if]
   11:     2drop defined str=
   12: [else]
   13:     \ : \G postpone \ ; immediate
   14:     0
   15: [then]
   16: 0= [if]
   17: 
   18: : str= ( c-addr1 u1 c-addr2 u2 -- f ) \ gforth
   19:     compare 0= ;
   20: 
   21: : string-prefix? ( c-addr1 u1 c-addr2 u2 -- f ) \ gforth
   22:     \G Is @var{c-addr2 u2} a prefix of @var{c-addr1 u1}?
   23:     tuck 2>r min 2r> str= ;
   24: 
   25: : str< ( c-addr1 u1 c-addr2 u2 -- f ) \ gforth
   26:     compare 0< ;
   27: 
   28: [then]