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% eptexdir/eptex.ech: changefile used to build e-pTeX, see eptexdir/eptex-base.ch for details.
% Public domain. Originally written by Peter Breitenlohner <tex-live@tug.org>.

@x e-pTeX: logo
\def\eTeX{$\varepsilon$-\TeX}
@y
\def\eTeX{$\varepsilon$-\TeX}
\def\epTeX{$\varepsilon$-p\TeX}
@z

@x [1.2] l.200 - pTeX:
@d pTeX_version_string=='-p3.1.11' {current p\TeX\ version}
@y
@d  pTeX_version_string=='-p3.1.11-110315' {current \epTeX\ version}
@z

@x e-pTeX: banner
  {printed when p\TeX\ starts}
@y
  {printed when p\TeX\ starts}
@#
@d epTeX_version==pTeX_version_string,eTeX_version_string
@d epTeX_banner=='This is e-pTeX, Version 3.1415926',epTeX_version
@d epTeX_banner_k==epTeX_banner
  {printed when \epTeX\ starts}
@z

@x
@d max_quarterword=255 {largest allowable value in a |quarterword|}
@y
@d max_quarterword=@"FFFF {largest allowable value in a |quarterword|}
@z

@x
@d box_dir(#) == subtype(#) {direction mode of a box}
@d set_box_dir(#) == subtype(#):=set_box_dir_end
@y
@d box_dir(#) == (subtype(#)mod 8) {direction mode of a box}
@d set_box_dir(#) == subtype(#):=(subtype(#)div 8)*8+set_box_dir_end 
@z

@x [26.424] e-pTeX: node types
    last_node_type_code:
      if (type(tail)<>math_node)or(subtype(tail)<>end_M_code) then
        if type(tail)<=unset_node then cur_val:=type(tail)+1
        else cur_val:=unset_node+2;
      end; {there are no other cases}
    end
@y
      last_node_type_code:
        if ((type(q)<>math_node)or(subtype(q)<>end_M_code))and(head<>tail) then
          if type(q)<=unset_node then begin
            if type(q)=dir_node then q:=list_ptr(q);
            cur_val:=type(q);
            if cur_val<dir_node then cur_val:=cur_val+1
            else if cur_val>disp_node then cur_val:=cur_val-1;
            end
          else cur_val:=unset_node; {\epTeX's |unset_node| is \eTeX's |unset_node+2|}
      end; {there are no other cases}
    end;
@z

@x e-pTeX: if primitives - leave room for three e-TeX codes
@d if_tdir_code=if_case_code+1 { `\.{\\iftdir}' }
@y
@d if_tdir_code=if_case_code+4 { `\.{\\iftdir}' }
@z

@x
@d box_lrstat(#) == subtype(#) {direction mode of a box}
@d set_box_lrstat(#) ==  subtype(#):=set_box_lrstat_end
@d set_box_lrstat_end(#) == #
@y
@d box_lrstat(#) == (subtype(#)div 8) {direction mode of a box}
@d set_box_lrstat(#) == subtype(#):=(subtype(#)mod 8)+8*set_box_lrstat_end
@d set_box_lrstat_end(#) == (#)
@z

@x e-pTeX: font_char_{wd,ht,dp,ic}_code l.27306
    begin i:=char_info(q)(qi(cur_val));
@y
    begin i:=orig_char_info(q)(qi(cur_val));
@z

@x e-pTeX: displacement value when typesetting right-to-left l.27798
@!LR_temp:pointer; {holds a temporarily removed \.{\\endM} node}
@y
@!revdisp:scaled; {temporary value of displacement}
@!LR_temp:pointer; {holds a temporarily removed \.{\\endM} node}
@z

@x e-pTeX: reverse nodes of an hlist l.28010
var l:pointer; {the new list}
@y
var l,la:pointer; {the new list}
disp,disp2: scaled; { displacement } disped: boolean;
@z
@x e-pTeX: reverse nodes of an hlist l.28010
begin g_order:=glue_order(this_box); g_sign:=glue_sign(this_box);
@y 
begin g_order:=glue_order(this_box); g_sign:=glue_sign(this_box);
disp:=revdisp; disped:=false;
@z
@x e-pTeX: reverse nodes of an hlist l.28010
done:reverse:=l;
@y
done: {if the beginning node of the new list isn't |disp_node|,
       we insert |disp_node| to fix.}
if (l<>null)and(type(l)<>disp_node) then begin
  p:=get_node(small_node_size); type(p):=disp_node;
  disp_dimen(p):=disp; link(p):=l; reverse:=p;
  end
else reverse:=l;
@z
@x e-pTeX: reverse nodes of an hlist l.28010
  q:=link(p); link(p):=l; l:=p; p:=q;
@y
  if font_dir[f]<>dir_default then begin
    q:=link(p); la:=l; l:=p; p:=link(q); link(q):=la;
    end
  else begin q:=link(p); link(p):=l; l:=p; p:=q; end;
@z
@x e-pTeX: reverse nodes of an hlist l.28010
othercases goto next_p
@y
disp_node: begin
  disp2:=disp_dimen(p); disp_dimen(p):=disp; disp:=disp2;
  { print_nl("ep TeXXeT:"); print_int(disp_dimen(p)); }
  { print(" -> "); print_int(disp); }
  { if not disped then begin disped:=true; print(" NL"); end; end; }
  if not disped then disped:=true; end;
othercases goto next_p
@z

@x e-pTeX: ifcsname l.28620
  buffer[m]:=info(p) mod @'400; incr(m); p:=link(p);
@y
  if check_kanji(info(p)) then {wchar_token}
    begin buffer[m]:=Hi(info(p)); incr(m);
    end;
  buffer[m]:=Lo(info(p)); incr(m); p:=link(p);
@z

@x e-pTeX: if_font_char_code l.28633
    b:=char_exists(char_info(n)(qi(cur_val)))
@y
    b:=char_exists(orig_char_info(n)(qi(cur_val)))
@z

@x
procedure print_direction(@!d:integer); {print the direction represented by d}
@y
procedure print_direction_alt(@!d:integer);
var x: boolean;
begin x:=false;
case abs(d) of
dir_yoko: begin print(", yoko"); x:=true; end;
dir_tate: begin print(", tate"); x:=true; end;
dir_dtou: begin print(", dtou"); x:=true; end;
end;
if x then begin if d<0 then print("(math)");
print(" direction"); end;
end;
@#
procedure print_direction(@!d:integer); {print the direction represented by d}
@z