% This is `tex.ech' in text format as of Aug 3, 2005,
% for web2c-7.5 and e-TeX Version 2.1 as of Jul 19, 2004,
% made by B. Raichle and P. Breitenlohner.
% Public domain.
 
% Note: This file, etexdir/tex.ech, contains the web2c changes for the
% e-TeX specific part of etex.web (defined in etexdir/etex.ch) and is
% used as follows to construct the web2c change file for e-TeX:
%
%	etexdir/tex.ch0		)
%	   +			)
%	tex.ch			)
%	   +			)   =>   tie -c ...   =>   etex.ch
%	etexdir/tex.ch1		)
%	   +			)
%	etexdir/tex.ech		)
%
% In addition, this file is used to construct the web2c change file
% for pdfeTeX:
%
%	pdfetexdir/tex.ch0	)
%	   +			)
%	tex.ch			)
%	   +			)
%	etexdir/tex.ch1		)
%	   +			)   =>   tie -c ...   =>   pdfetex.ch
%	etexdir/tex.ech		)
%	   +			)
%	pdfetexdir/tex.ch1	)
%	   +			)
%	pdftexdir/tex.pch	)
%
% where the four (small) files {,pdf}etexdir/tex.ch[01] take care
% of interferences between web2c, e-Tex, pdfTeX changes.
% Consequently, changes in all these files have to be coordinated.

@x [1] m.2 l.188 - Web2C: extensions imply we're not e-TeX
@d eTeX_banner=='This is e-TeX, Version 3.141592',eTeX_version_string
@y
@d eTeX_banner_k=='This is e-TeXk, Version 3.141592',eTeX_version_string
@d eTeX_banner=='This is e-TeX, Version 3.141592',eTeX_version_string
@z

@x [51.1332] l.24203 (ca.) texarray
  line_stack:=xmalloc_array (integer, max_in_open);
@y
  line_stack:=xmalloc_array (integer, max_in_open);
  eof_seen:=xmalloc_array (boolean, max_in_open);
  grp_stack:=xmalloc_array (save_pointer, max_in_open);
  if_stack:=xmalloc_array (pointer, max_in_open);
@z

@x [51.1337] l.24371 (ca.) texarray
  trie_root:=0; trie_c[0]:=si(0); trie_ptr:=0;
@y
  trie_root:=0; trie_c[0]:=si(0); trie_ptr:=0;
  hyph_root:=0; hyph_start:=0;
@z

@x [53a.1379] l.??? -etex command line switch
@!init if (buffer[loc]="*")and(format_ident=" (INITEX)") then
@y
@!init if (etex_p or(buffer[loc]="*"))and(format_ident=" (INITEX)") then
@z

@x [53a.1379] l.??? -etex command line switch
  incr(loc); eTeX_mode:=1; {enter extended mode}
@y
  if (buffer[loc]="*") then incr(loc);
  eTeX_mode:=1; {enter extended mode}
@z

@x [53a.1383] l.??? -etex command line switch
@!eTeX_mode: 0..1; {identifies compatibility and extended mode}
@y
@!eTeX_mode: 0..1; {identifies compatibility and extended mode}
@!etex_p: boolean; {was the -etex option specified}
@z

@x [53a.1391] l.??? texarray
@!eof_seen : array[1..max_in_open] of boolean; {has eof been seen?}
@y
@!eof_seen : ^boolean; {has eof been seen?}
@z

@x [53a.1506] l.??? texarray
@!grp_stack : array[0..max_in_open] of save_pointer; {initial |cur_boundary|}
@!if_stack : array[0..max_in_open] of pointer; {initial |cond_ptr|}
@y
@!grp_stack : ^save_pointer; {initial |cur_boundary|}
@!if_stack : ^pointer; {initial |cond_ptr|}
@z

@x [53a.1587] l.??? texarray
hyph_root:=0; hyph_start:=0;
@y
@z

@x [54/web2c.???] l.??? needed earlier
replacement, but always existing character |font_bc[f]|.
@^inner loop@>

@<Declare additional functions for ML\TeX@>=
function effective_char(@!err_p:boolean;
@y
replacement, but always existing character |font_bc[f]|.
@^inner loop@>

@<Declare \eTeX\ procedures for sc...@>=
function effective_char(@!err_p:boolean;
@z