summaryrefslogtreecommitdiff
path: root/Build/source/texk/web2c/enctex.ch
blob: 45dbb8419b846843c982f4269ad1bda50cdccc16 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
% enctex.ch: implementation of enc\TeX, to be applied on top of tex.ch.
% Used by TeX, e-TeX, pdfTeX, and XeTeX, but not by pTeX.

@x [2.20] l.579 - encTeX: global declarations
xprn: array [ASCII_code] of ASCII_code;
   { non zero iff character is printable }
@y
xprn: array [ASCII_code] of ASCII_code;
   { non zero iff character is printable }
mubyte_read: array [ASCII_code] of pointer;
   { non zero iff character begins the multi byte code }
mubyte_write: array [ASCII_code] of str_number;
   { non zero iff character expands to multi bytes in log and write files }
mubyte_cswrite: array [0..127] of pointer;
   { non null iff cs mod 128 expands to multi bytes in log and write files }
mubyte_skip: integer;  { the number of bytes to skip in |buffer| }
mubyte_keep: integer; { the number of chars we need to keep unchanged }
mubyte_skeep: integer; { saved |mubyte_keep| }
mubyte_prefix: integer; { the type of mubyte prefix }
mubyte_tablein: boolean; { the input side of table will be updated }
mubyte_tableout: boolean; { the output side of table will be updated }
mubyte_relax: boolean; { the relax prefix is used }
mubyte_start: boolean; { we are making the token at the start of the line }
mubyte_sstart: boolean; { saved |mubyte_start| }
mubyte_token: pointer; { the token returned by |read_buffer| }
mubyte_stoken: pointer; { saved first token in mubyte primitive }
mubyte_sout: integer; { saved value of |mubyte_out| }
mubyte_slog: integer; { saved value of |mubyte_log| }
spec_sout: integer; { saved value of |spec_out| }
no_convert: boolean; { conversion supressed by noconvert primitive }
active_noconvert: boolean; { true if noconvert primitive is active }
write_noexpanding: boolean; { true only if we need not write expansion }
cs_converting: boolean; { true only if we need csname converting }
special_printing: boolean; { true only if we need converting in special }
message_printing: boolean; { true if message or errmessage prints to string }
@z

@x [2.23] l.723 - encTeX
for i:=@'177 to @'377 do xchr[i]:=i;
@y
for i:=@'177 to @'377 do xchr[i]:=i;
{Initialize enc\TeX\ data.}
for i:=0 to 255 do mubyte_read[i]:=null;
for i:=0 to 255 do mubyte_write[i]:=0;
for i:=0 to 128 do mubyte_cswrite[i]:=null;
mubyte_keep := 0; mubyte_start := false;
write_noexpanding := false; cs_converting := false;
special_printing := false; message_printing := false;
no_convert := false; active_noconvert := false;
@z

@x [5.59] l.1508FIXME -- enc\TeX\ modifications of |print|.
  else begin if selector>pseudo then
      begin print_char(s); return; {internal strings are not expanded}
      end;
    if (@<Character |s| is the current new-line character@>) then
      if selector<pseudo then
        begin print_ln; return;
        end;
@y
  else begin if (selector>pseudo) and (not special_printing)
                 and (not message_printing) then
      begin print_char(s); return; {internal strings are not expanded}
      end;
    if (@<Character |s| is the current new-line character@>) then
      if selector<pseudo then
        begin print_ln; no_convert := false; return;
        end
      else if message_printing then
        begin print_char(s); no_convert := false; return;
        end;
    if (mubyte_log>0) and (not no_convert) and (mubyte_write[s]>0) then
      s := mubyte_write[s]
    else if xprn[s] or special_printing then
      begin print_char(s); no_convert := false; return; end;
    no_convert := false;
@z

@x [17.230] l.4725 - encTeX: xord_code_base, xchr_code_base, prn_code_base,
@d math_font_base=cur_font_loc+1 {table of 48 math font numbers}
@y
@d xord_code_base=cur_font_loc+1
@d xchr_code_base=xord_code_base+1
@d xprn_code_base=xchr_code_base+1
@d math_font_base=xprn_code_base+1
@z

% encTeX: \mubytein \mubyteout \mubytelog and \specialout
@x [17.236] l.4954
@d web2c_int_pars=web2c_int_base+3 {total number of web2c's integer parameters}
@y
@d mubyte_in_code=web2c_int_base+3 {if positive then reading mubytes is active}
@d mubyte_out_code=web2c_int_base+4 {if positive then printing mubytes is active}
@d mubyte_log_code=web2c_int_base+5 {if positive then print mubytes to log and terminal}
@d spec_out_code=web2c_int_base+6 {if positive then print specials by mubytes}
@d web2c_int_pars=web2c_int_base+7 {total number of web2c's integer parameters}
@z

% encTeX: \mubytein \mubyteout \mubytelog and \specialout
@x [17.236] l.5016
@d tracing_char_sub_def==int_par(tracing_char_sub_def_code)
@y
@d tracing_char_sub_def==int_par(tracing_char_sub_def_code)
@d mubyte_in==int_par(mubyte_in_code)
@d mubyte_out==int_par(mubyte_out_code)
@d mubyte_log==int_par(mubyte_log_code)
@d spec_out==int_par(spec_out_code)
@z

% encTeX: \mubytein \mubyteout \mubytelog and \specialout
@x [17.237] l.5080
tracing_char_sub_def_code:print_esc("tracingcharsubdef");
@y
tracing_char_sub_def_code:print_esc("tracingcharsubdef");
mubyte_in_code:print_esc("mubytein");
mubyte_out_code:print_esc("mubyteout");
mubyte_log_code:print_esc("mubytelog");
spec_out_code:print_esc("specialout");
@z

% encTeX: \mubytein \mubyteout \mubytelog and \specialout
@x [17.238] l.5200
@!@:tracing_char_sub_def_}{\.{\\tracingcharsubdef} primitive@>
  end;
@y
@!@:tracing_char_sub_def_}{\.{\\tracingcharsubdef} primitive@>
  end;
if enctex_p then
  begin enctex_enabled_p:=true;
  primitive("mubytein",assign_int,int_base+mubyte_in_code);@/
@!@:mubyte_in_}{\.{\\mubytein} primitive@>
  primitive("mubyteout",assign_int,int_base+mubyte_out_code);@/
@!@:mubyte_out_}{\.{\\mubyteout} primitive@>
  primitive("mubytelog",assign_int,int_base+mubyte_log_code);@/
@!@:mubyte_log_}{\.{\\mubytelog} primitive@>
  primitive("specialout",assign_int,int_base+spec_out_code);@/
@!@:spec_out_}{\.{\\specialout} primitive@>
end;
@z

@x [18.262] - encTeX: control sequence to byte sequence
they may be unprintable.

@<Basic printing...@>=
procedure print_cs(@!p:integer); {prints a purported control sequence}
begin if p<hash_base then {single character}
@y
they may be unprintable.

The conversion from control sequence to byte sequence for enc\TeX is
implemented here. Of course, the simplest way is to implement an array
of string pointers with |hash_size| length, but we assume that only a
few control sequences will need to be converted. So |mubyte_cswrite|,
an array with only 128 items, is used. The items point to the token
lists. First token includes a csname number and the second points the
string to be output. The third token includes the number of another
csname and fourth token its pointer to the string etc. We need to do
the sequential searching in one of the 128 token lists.

@<Basic printing...@>=
procedure print_cs(@!p:integer); {prints a purported control sequence}
var q: pointer;
    s: str_number;
begin
  if active_noconvert and (not no_convert) and
     (eq_type(p) = let) and (equiv(p) = normal+11) then { noconvert }
  begin
     no_convert := true;
     return;
  end;
  s := 0;
  if cs_converting and (not no_convert) then
  begin
    q := mubyte_cswrite [p mod 128] ;
    while q <> null do
    if info (q) = p then
    begin
      s := info (link(q)); q := null;
    end else  q := link (link (q));
  end;
  no_convert := false;
  if s > 0 then print (s)
  else if p<hash_base then {single character}
@z

@x [18.262] - encTeX: exit label for print_cs
  print_char(" ");
  end;
end;
@y
  print_char(" ");
  end;
exit: end;
@z

@x [18.265] - encTeX: \endmubyte primitive
primitive("endcsname",end_cs_name,0);@/
@!@:end_cs_name_}{\.{\\endcsname} primitive@>
@y
primitive("endcsname",end_cs_name,0);@/
@!@:end_cs_name_}{\.{\\endcsname} primitive@>
if enctex_p then
begin
  primitive("endmubyte",end_cs_name,10);@/
@!@:end_mubyte_}{\.{\\endmubyte} primitive@>
end;
@z

@x [18.266] - encTeX: \endmubyte primitive
end_cs_name: print_esc("endcsname");
@y
end_cs_name: if chr_code = 10 then print_esc("endmubyte")
             else print_esc("endcsname");
@z

@x [22.318] encTeX - native buffer printing
if j>0 then for i:=start to j-1 do
  begin if i=loc then set_trick_count;
  print(buffer[i]);
  end
@y
i := start; mubyte_skeep := mubyte_keep;
mubyte_sstart := mubyte_start; mubyte_start := false;
if j>0 then while i < j do
begin
  if i=loc then set_trick_count;
  print_buffer(i);
end;
mubyte_keep := mubyte_skeep; mubyte_start := mubyte_sstart
@z

@x [24.332] encTeX: insert the added functions
appear on that line. (There might not be any tokens at all, if the
|end_line_char| has |ignore| as its catcode.)
@y
appear on that line. (There might not be any tokens at all, if the
|end_line_char| has |ignore| as its catcode.)

Some additional routines used by the enc\TeX extension have to be
declared at this point.

@p @t\4@>@<Declare additional routines for enc\TeX@>@/
@z

@x [24.341] - encTeX: more declarations in expand processor
var k:0..buf_size; {an index into |buffer|}
@!t:halfword; {a token}
@y
var k:0..buf_size; {an index into |buffer|}
@!t:halfword; {a token}
@!i,@!j: 0..buf_size; {more indexes for encTeX}
@!mubyte_incs: boolean; {control sequence is converted by mubyte}
@!p:pointer;  {for encTeX test if noexpanding}
@z

@x [24.343] - encTeX: access the buffer via read_buffer
  begin cur_chr:=buffer[loc]; incr(loc);
@y
  begin
    { Use |k| instead of |loc| for type correctness. }
    k := loc;
    cur_chr := read_buffer (k);
    loc := k; incr (loc);
    if (mubyte_token > 0) then
    begin
      state := mid_line;
      cur_cs := mubyte_token - cs_token_flag;
      goto found;
    end;
@z

@x [24.354] - encTeX: access the buffer via read_buffer
else  begin start_cs: k:=loc; cur_chr:=buffer[k]; cat:=cat_code(cur_chr);
  incr(k);
@y
else  begin start_cs:
   mubyte_incs := false; k := loc; mubyte_skeep := mubyte_keep;
   cur_chr := read_buffer (k); cat := cat_code (cur_chr);
   if (mubyte_in>0) and (not mubyte_incs) and
     ((mubyte_skip>0) or (cur_chr<>buffer[k])) then mubyte_incs := true;
   incr (k);
   if mubyte_token > 0 then
   begin
     state := mid_line;
     cur_cs := mubyte_token - cs_token_flag;
     goto found;
   end;
@z

@x [24.354] - encTeX: noexpanding the marked control sequence
  cur_cs:=single_base+buffer[loc]; incr(loc);
  end;
found: cur_cmd:=eq_type(cur_cs); cur_chr:=equiv(cur_cs);
if cur_cmd>=outer_call then check_outer_validity;
@y
  mubyte_keep := mubyte_skeep;
  cur_cs:=single_base + read_buffer(loc); incr(loc);
  end;
found: cur_cmd:=eq_type(cur_cs); cur_chr:=equiv(cur_cs);
if cur_cmd>=outer_call then check_outer_validity;
if write_noexpanding then
begin
  p := mubyte_cswrite [cur_cs mod 128];
  while p <> null do
    if info (p) = cur_cs then
    begin
      cur_cmd := relax; cur_chr := 256; p := null;
    end else p := link (link (p));
end;
@z

@x [24.356] - encTeX: access the buffer via read_buffer
begin repeat cur_chr:=buffer[k]; cat:=cat_code(cur_chr); incr(k);
until (cat<>letter)or(k>limit);
@<If an expanded...@>;
if cat<>letter then decr(k);
  {now |k| points to first nonletter}
if k>loc+1 then {multiletter control sequence has been scanned}
  begin cur_cs:=id_lookup(loc,k-loc); loc:=k; goto found;
  end;
end
@y
begin
  repeat cur_chr := read_buffer (k); cat := cat_code (cur_chr);
    if mubyte_token>0 then cat := escape;
    if (mubyte_in>0) and (not mubyte_incs) and (cat=letter) and
      ((mubyte_skip>0) or (cur_chr<>buffer[k])) then mubyte_incs := true;
    incr (k);
  until (cat <> letter) or (k > limit);
  @<If an expanded...@>;
  if cat <> letter then
  begin
    decr (k); k := k - mubyte_skip;
  end;
  if k > loc + 1 then { multiletter control sequence has been scanned }
  begin
    if mubyte_incs then { multibyte in csname occurrs }
    begin
      i := loc; j := first; mubyte_keep := mubyte_skeep;
      if j - loc + k > max_buf_stack then
      begin
        max_buf_stack := j - loc + k;
        if max_buf_stack >= buf_size then
        begin
          max_buf_stack := buf_size;
          overflow ("buffer size", buf_size);
        end;
      end;
      while i < k do
      begin
        buffer [j] := read_buffer (i);
        incr (i); incr (j);
      end;
      if j = first+1 then
        cur_cs := single_base + buffer [first]
      else
        cur_cs := id_lookup (first, j-first);
    end else cur_cs := id_lookup (loc, k-loc) ;
    loc := k;
    goto found;
  end;
end
@z

@x [24.357] - encTeX: noexpanding the marked control sequence
      else check_outer_validity;
@y
      else check_outer_validity;
    if write_noexpanding then
    begin
      p := mubyte_cswrite [cur_cs mod 128];
      while p <> null do
        if info (p) = cur_cs then
        begin
          cur_cmd := relax; cur_chr := 256; p := null;
        end else p := link (link (p));
    end;
@z

@x [24.363] encTeX - native buffer printing
  if start<limit then for k:=start to limit-1 do print(buffer[k]);
@y
  k := start;
  while k < limit do begin print_buffer(k) end;
@z

@x [25.372] - encTeX: we need to distinguish \endcsname and \endmubyte
if cur_cmd<>end_cs_name then @<Complain about missing \.{\\endcsname}@>;
@y
if (cur_cmd<>end_cs_name) or (cur_chr<>0) then @<Complain about missing \.{\\endcsname}@>;
@z

@x [26.414] l.8358 - encTeX: accessing xord/xchr/xprn
if m=math_code_base then scanned_result(ho(math_code(cur_val)))(int_val)
@y
if m=xord_code_base then scanned_result(xord[cur_val])(int_val)
else if m=xchr_code_base then scanned_result(xchr[cur_val])(int_val)
else if m=xprn_code_base then scanned_result(xprn[cur_val])(int_val)
else if m=math_code_base then scanned_result(ho(math_code(cur_val)))(int_val)
@z

@x [29.534] l.10293 - enc\TeX: add enc\TeX banner after loading fmt file
  begin wlog_cr; wlog('MLTeX v2.2 enabled');
  end;
@y
  begin wlog_cr; wlog('MLTeX v2.2 enabled');
  end;
if enctex_enabled_p then
  begin wlog_cr; wlog(encTeX_banner); wlog(', reencoding enabled');
    if translate_filename then
      begin wlog_cr;
        wlog(' (\xordcode, \xchrcode, \xprncode overridden by TCX)');
    end;
  end;
@z

@x [49.1211] - encTeX: extra variables for \mubyte primitive
@!p,@!q:pointer; {for temporary short-term use}
@y
@!p,@!q,@!r:pointer; {for temporary short-term use}
@z

@x [49.1219] - encTeX: \mubyte and \noconvert primitives
primitive("futurelet",let,normal+1);@/
@!@:future_let_}{\.{\\futurelet} primitive@>
@y
primitive("futurelet",let,normal+1);@/
@!@:future_let_}{\.{\\futurelet} primitive@>
if enctex_p then
begin
  primitive("mubyte",let,normal+10);@/
@!@:mubyte_}{\.{\\mubyte} primitive@>
  primitive("noconvert",let,normal+11);@/
@!@:noconvert_}{\.{\\noconvert} primitive@>
end;
@z

@x [49.1220] - encTeX: \mubyte primitive
let: if chr_code<>normal then print_esc("futurelet")@+else print_esc("let");
@y
let: if chr_code<>normal then
      if chr_code = normal+10 then print_esc("mubyte")
      else if chr_code = normal+11 then print_esc("noconvert")
      else print_esc("futurelet")
  else print_esc("let");
@z

@x [49.1221] - encTeX: \mubyte primitive
let:  begin n:=cur_chr;
@y
let:  if cur_chr = normal+11 then do_nothing  { noconvert primitive }
      else if cur_chr = normal+10 then        { mubyte primitive }
      begin
        selector:=term_and_log;
        get_token;
        mubyte_stoken := cur_tok;
        if cur_tok <= cs_token_flag then mubyte_stoken := cur_tok mod 256;
        mubyte_prefix := 60;  mubyte_relax := false;
        mubyte_tablein := true; mubyte_tableout := true;
        get_x_token;
        if cur_cmd = spacer then get_x_token;
        if cur_cmd = sub_mark then
        begin
          mubyte_tableout := false; get_x_token;
          if cur_cmd = sub_mark then
          begin
            mubyte_tableout := true; mubyte_tablein := false;
            get_x_token;
          end;
        end else if (mubyte_stoken > cs_token_flag) and
                    (cur_cmd = mac_param) then
                 begin
                   mubyte_tableout := false;
                   scan_int; mubyte_prefix := cur_val; get_x_token;
                   if mubyte_prefix > 50 then mubyte_prefix := 52;
                   if mubyte_prefix <= 0 then mubyte_prefix := 51;
                 end
        else if (mubyte_stoken > cs_token_flag) and (cur_cmd = relax) then
             begin
               mubyte_tableout := true; mubyte_tablein := false;
               mubyte_relax := true; get_x_token;
             end;
        r := get_avail; p := r;
        while cur_cs = 0 do begin store_new_token (cur_tok); get_x_token; end;
        if (cur_cmd <> end_cs_name) or (cur_chr <> 10) then
        begin
          print_err("Missing "); print_esc("endmubyte"); print(" inserted");
          help2("The control sequence marked <to be read again> should")@/
("not appear in <byte sequence> between \mubyte and \endmubyte.");
          back_error;
        end;
        p := link(r);
        if (p = null) and mubyte_tablein then
        begin
          print_err("The empty <byte sequence>, ");
          print_esc("mubyte"); print(" ignored");
          help2("The <byte sequence> in")@/
("\mubyte <token> <byte sequence>\endmubyte should not be empty.");
          error;
        end else begin
          while p <> null do
          begin
            append_char (info(p) mod 256);
            p := link (p);
          end;
          flush_list (r);
          if (str_start [str_ptr] + 1 = pool_ptr) and
            (str_pool [pool_ptr-1] = mubyte_stoken) then
          begin
            if mubyte_read [mubyte_stoken] <> null
               and mubyte_tablein then  { clearing data }
                  dispose_munode (mubyte_read [mubyte_stoken]);
            if mubyte_tablein then mubyte_read [mubyte_stoken] := null;
            if mubyte_tableout then mubyte_write [mubyte_stoken] := 0;
            pool_ptr := str_start [str_ptr];
          end else begin
            if mubyte_tablein then mubyte_update;    { updating input side }
            if mubyte_tableout then  { updating output side }
            begin
              if mubyte_stoken > cs_token_flag then { control sequence }
              begin
                dispose_mutableout (mubyte_stoken-cs_token_flag);
                if (str_start [str_ptr] < pool_ptr) or mubyte_relax then
                begin       { store data }
                  r := mubyte_cswrite[(mubyte_stoken-cs_token_flag) mod 128];
                  p := get_avail;
                  mubyte_cswrite[(mubyte_stoken-cs_token_flag) mod 128] := p;
                  info (p) := mubyte_stoken-cs_token_flag;
                  link (p) := get_avail;
                  p := link (p);
                  if mubyte_relax then begin
                    info (p) := 0; pool_ptr := str_start [str_ptr];
                  end else info (p) := slow_make_string;
                  link (p) := r;
                end;
              end else begin                       { single character  }
                if str_start [str_ptr] = pool_ptr then
                  mubyte_write [mubyte_stoken] := 0
                else
                  mubyte_write [mubyte_stoken] := slow_make_string;
              end;
            end else pool_ptr := str_start [str_ptr];
          end;
        end;
      end else begin   { let primitive }
        n:=cur_chr;
@z

@x [49.1230] l.22936 - encTeX: \xordcode, \xchrcode, \xprncode primitives
primitive("catcode",def_code,cat_code_base);
@!@:cat_code_}{\.{\\catcode} primitive@>
@y
primitive("catcode",def_code,cat_code_base);
@!@:cat_code_}{\.{\\catcode} primitive@>
if enctex_p then
begin
  primitive("xordcode",def_code,xord_code_base);
@!@:xord_code_}{\.{\\xordcode} primitive@>
  primitive("xchrcode",def_code,xchr_code_base);
@!@:xchr_code_}{\.{\\xchrcode} primitive@>
  primitive("xprncode",def_code,xprn_code_base);
@!@:xprn_code_}{\.{\\xprncode} primitive@>
end;
@z

@x [49.1231] l.22956 - encTeX: \xordcode, \xchrcode, \xprncode primitives
def_code: if chr_code=cat_code_base then print_esc("catcode")
@y
def_code: if chr_code=xord_code_base then print_esc("xordcode")
  else if chr_code=xchr_code_base then print_esc("xchrcode")
  else if chr_code=xprn_code_base then print_esc("xprncode")
  else if chr_code=cat_code_base then print_esc("catcode")
@z

@x [49.1232] l.22969 - encTeX: setting a new value to xchr/xord/xprn
  p:=cur_chr; scan_char_num; p:=p+cur_val; scan_optional_equals;
  scan_int;
@y
  p:=cur_chr; scan_char_num;
  if p=xord_code_base then p:=cur_val
  else if p=xchr_code_base then p:=cur_val+256
  else if p=xprn_code_base then p:=cur_val+512
  else p:=p+cur_val;
  scan_optional_equals;
  scan_int;
@z

@x [49.1232] l.22980 - encTeX: setting a new value to xchr/xord/xprn
  if p<math_code_base then define(p,data,cur_val)
@y
  if p<256 then xord[p]:=cur_val
  else if p<512 then xchr[p-256]:=cur_val
  else if p<768 then xprn[p-512]:=cur_val
  else if p<math_code_base then define(p,data,cur_val)
@z

@x [49.1279] - encTeX: implement \noconvert
old_setting:=selector; selector:=new_string;
token_show(def_ref); selector:=old_setting;
@y
old_setting:=selector; selector:=new_string;
message_printing := true; active_noconvert := true;
token_show(def_ref);
message_printing := false; active_noconvert := false;
selector:=old_setting;
@z

% encTeX: |slow_print| is too eager to expand printed strings.  To
% selectively suppress or enable expansion (needed to \noconvert)
% |print| will look at |message_printing|.  So we bypass |slow_print|
% and go directly to |print| instead.
@x [49.1279] - encTeX: to handle \noconvert in messages go directly to |print|
slow_print(s); update_terminal;
@y
print(s); update_terminal;
@z

@x [49.1279] - encTeX: to handle \noconvert in messages go directly to |print|
begin print_err(""); slow_print(s);
@y
begin print_err(""); print(s);
@z

% encTeX: dump encTeX-specific data to fmt file.
@x [50.1302] l.23694
@<Dump ML\TeX-specific data@>;
@y
@<Dump ML\TeX-specific data@>;
@<Dump enc\TeX-specific data@>;
@z

% encTeX: undump encTeX-specific data from fmt file.
@x [50.1303] l.23694
@<Undump ML\TeX-specific data@>;
@y
@<Undump ML\TeX-specific data@>;
@<Undump enc\TeX-specific data@>;
@z

@x [51.1337] l.24371 - enc\TeX: add. enc\TeX banner after loading fmt file
  begin wterm_ln('MLTeX v2.2 enabled');
  end;
@y
  begin wterm_ln('MLTeX v2.2 enabled');
  end;
if enctex_enabled_p then
  begin wterm(encTeX_banner); wterm_ln(', reencoding enabled.');
    if translate_filename then begin
      wterm_ln(' (\xordcode, \xchrcode, \xprncode overridden by TCX)');
    end;
  end;
@z

@x [53.1341] - encTeX: keep track of mubyte value for \write
@d write_stream(#) == info(#+1) {stream number (0 to 17)}
@y
@d write_stream(#) == type(#+1) {stream number (0 to 17)}
@d mubyte_zero == 64
@d write_mubyte(#) == subtype(#+1) {mubyte value + |mubyte_zero|}
@z

@x [53.1350] - encTeX: \write stores mubyte_out value
write_stream(tail):=cur_val;
@y
write_stream(tail):=cur_val;
if mubyte_out + mubyte_zero < 0 then write_mubyte(tail) := 0
else if mubyte_out + mubyte_zero >= 2*mubyte_zero then
       write_mubyte(tail) := 2*mubyte_zero - 1
     else write_mubyte(tail) := mubyte_out + mubyte_zero;
@z

@x [53.1353] - encTeX: \special stores specialout and mubyteout values
begin new_whatsit(special_node,write_node_size); write_stream(tail):=null;
p:=scan_toks(false,true); write_tokens(tail):=def_ref;
@y
begin new_whatsit(special_node,write_node_size);
if spec_out + mubyte_zero < 0 then write_stream(tail) := 0
else if spec_out + mubyte_zero >= 2*mubyte_zero then
       write_stream(tail) := 2*mubyte_zero - 1
     else write_stream(tail) := spec_out + mubyte_zero;
if mubyte_out + mubyte_zero < 0 then write_mubyte(tail) := 0
else if mubyte_out + mubyte_zero >= 2*mubyte_zero then
       write_mubyte(tail) := 2*mubyte_zero - 1
     else write_mubyte(tail) := mubyte_out + mubyte_zero;
if (spec_out = 2) or (spec_out = 3) then
  if (mubyte_out > 2) or (mubyte_out = -1) or (mubyte_out = -2) then
    write_noexpanding := true;
p:=scan_toks(false,true); write_tokens(tail):=def_ref;
write_noexpanding := false;
@z

@x [53.1355] - encTeX: \write prints \mubyteout value
else print_char("-");
@y
else print_char("-");
if (s = "write") and (write_mubyte (p) <> mubyte_zero) then
begin
  print_char ("<"); print_int (write_mubyte(p)-mubyte_zero); print_char (">");
end;
@z

@x [53.1356] - encTeX: \special prints \specialout and \mubyteout values
special_node:begin print_esc("special");
@y
special_node:begin print_esc("special");
if write_stream(p) <> mubyte_zero then
begin
  print_char ("<"); print_int (write_stream(p)-mubyte_zero);
  if (write_stream(p)-mubyte_zero = 2) or
     (write_stream(p)-mubyte_zero = 3) then
  begin
    print_char (":"); print_int (write_mubyte(p)-mubyte_zero);
  end;
  print_char (">");
end;
@z

@x [53.1368] - encTeX: conversions in \special
old_setting:=selector; selector:=new_string;
@y
old_setting:=selector; selector:=new_string;
spec_sout := spec_out;  spec_out := write_stream(p) - mubyte_zero;
mubyte_sout := mubyte_out;  mubyte_out := write_mubyte(p) - mubyte_zero;
active_noconvert := true;
mubyte_slog := mubyte_log;
mubyte_log := 0;
if (mubyte_out > 0) or (mubyte_out = -1) then mubyte_log := 1;
if (spec_out = 2) or (spec_out = 3) then
begin
  if (mubyte_out > 0) or (mubyte_out = -1) then
  begin
    special_printing := true; mubyte_log := 1;
  end;
  if mubyte_out > 1 then cs_converting := true;
end;
@z

@x [53.1368] - encTeX: conversions in \special
for k:=str_start[str_ptr] to pool_ptr-1 do dvi_out(so(str_pool[k]));
@y
if (spec_out = 1) or (spec_out = 3) then
  for k:=str_start[str_ptr] to pool_ptr-1 do
    str_pool[k] := si(xchr[so(str_pool[k])]);
for k:=str_start[str_ptr] to pool_ptr-1 do dvi_out(so(str_pool[k]));
spec_out := spec_sout; mubyte_out := mubyte_sout; mubyte_log := mubyte_slog;
special_printing := false; cs_converting := false;
active_noconvert := false;
@z

@x [53.1370] l.24770 - encTeX
begin @<Expand macros in the token list
@y
begin
mubyte_sout := mubyte_out;  mubyte_out := write_mubyte(p) - mubyte_zero;
if (mubyte_out > 2) or (mubyte_out = -1) or (mubyte_out = -2) then
  write_noexpanding := true;
@<Expand macros in the token list
@z

@x [53.1370] - encTeX: conversion in parameter of \write
token_show(def_ref); print_ln;
@y
active_noconvert := true;
if mubyte_out > 1 then cs_converting := true;
mubyte_slog := mubyte_log;
if (mubyte_out > 0) or (mubyte_out = -1) then mubyte_log := 1
else mubyte_log := 0;
token_show(def_ref); print_ln;
cs_converting := false; write_noexpanding := false;
active_noconvert := false;
mubyte_out := mubyte_sout; mubyte_log := mubyte_slog;
@z

@x[54.1376] l.24903 - enc\TeX
@* \[54] System-dependent changes.
@y
@* \[54/enc\TeX] System-dependent changes for enc\TeX.

@d encTeX_banner == ' encTeX v. Jun. 2004'

@ The boolean variable |enctex_p| is set by web2c according to the given
command line option (or an entry in the configuration file) before any
\TeX{} function is called.

@<Global...@> =
@!enctex_p: boolean;


@ The boolean variable |enctex_enabled_p| is used to enable enc\TeX's
primitives.  It is initialised to |false|.  When loading a \.{FMT} it
is set to the value of the boolean |enctex_p| saved in the \.{FMT} file.
Additionally it is set to the value of |enctex_p| in Ini\TeX.

@<Glob...@>=
@!enctex_enabled_p:boolean;  {enable encTeX}


@ @<Set init...@>=
enctex_enabled_p:=false;


@ Auxiliary functions/procedures for enc\TeX{} (by Petr Olsak) follow.
These functions implement the \.{\\mubyte} code to convert
the multibytes in |buffer| to one byte or to one control
sequence. These functions manipulate a mubyte tree: each node of
this tree is token list with n+1 tokens (first token consist the byte
from the byte sequence itself and the other tokens point to the
branches). If you travel from root of the tree to a leaf then you
find exactly one byte sequence which we have to convert to one byte or
control sequence. There are two variants of the leaf: the ``definitive
end'' or the ``middle leaf'' if a longer byte sequence exists and the mubyte
tree continues under this leaf. First variant is implemented as one
memory word where the link part includes the token to
which we have to convert and type part includes the number 60 (normal
conversion) or 1..52 (insert the control sequence).
The second variant of ``middle leaf'' is implemented as two memory words:
first one has a type advanced by 64 and link points to the second
word where info part includes the token to which we have to convert
and link points to the next token list with the branches of
the subtree.

The inverse: one byte to multi byte (for log printing and \.{\\write}
printing) is implemented via a pool. Each multibyte sequence is stored
in a pool as a string and |mubyte_write|[{\it printed char\/}] points
to this string.

@d new_mubyte_node ==
  link (p) := get_avail; p := link (p); info (p) := get_avail; p := info (p)
@d subinfo (#) == subtype (#)

@<Basic printing...@>=
{ read |buffer|[|i|] and convert multibyte.  |i| should have been
  of type 0..|buf_size|, but web2c doesn't like that construct in
  argument lists. }
function read_buffer(var i:integer):ASCII_code;
var p: pointer;
    last_found: integer;
    last_type: integer;
begin
  mubyte_skip := 0; mubyte_token := 0;
  read_buffer := buffer[i];
  if mubyte_in = 0 then
  begin
    if mubyte_keep > 0 then mubyte_keep := 0;
    return ;
  end;
  last_found := -2;
  if (i = start) and (not mubyte_start) then
  begin
    mubyte_keep := 0;
    if (end_line_char >= 0) and (end_line_char < 256) then
      if mubyte_read [end_line_char] <> null then
      begin
        mubyte_start := true; mubyte_skip := -1;
        p := mubyte_read [end_line_char];
        goto continue;
      end;
  end;
restart:
  mubyte_start := false;
  if (mubyte_read [buffer[i]] = null) or (mubyte_keep > 0) then
  begin
    if mubyte_keep > 0 then decr (mubyte_keep);
    return ;
  end;
  p := mubyte_read [buffer[i]];
continue:
  if type (p) >= 64 then
  begin
    last_type := type (p) - 64;
    p := link (p);
    mubyte_token := info (p); last_found := mubyte_skip;
  end else if type (p) > 0 then
  begin
    last_type := type (p);
    mubyte_token := link (p);
    goto found;
  end;
  incr (mubyte_skip);
  if i + mubyte_skip > limit then
  begin
    mubyte_skip := 0;
    if mubyte_start then goto restart;
    return;
  end;
  repeat
    p := link (p);
    if subinfo (info(p)) = buffer [i+mubyte_skip] then
    begin
      p := info (p); goto continue;
    end;
  until link (p) = null;
  mubyte_skip := 0;
  if mubyte_start then goto restart;
  if last_found = -2 then return;  { no found }
  mubyte_skip := last_found;
found:
  if mubyte_token < 256 then  { multibyte to one byte }
  begin
    read_buffer := mubyte_token;  mubyte_token := 0;
    i := i + mubyte_skip;
    if mubyte_start and (i >= start) then mubyte_start := false;
    return;
  end else begin     { multibyte to control sequence }
    read_buffer := 0;
    if last_type = 60 then { normal conversion }
      i := i + mubyte_skip
    else begin            { insert control sequence }
      decr (i); mubyte_keep := last_type;
      if i < start then mubyte_start := true;
      if last_type = 52 then mubyte_keep := 10000;
      if last_type = 51 then mubyte_keep := mubyte_skip + 1;
      mubyte_skip := -1;
    end;
    if mubyte_start and (i >= start) then mubyte_start := false;
    return;
  end;
exit: end;

@ @<Declare additional routines for enc\TeX@>=
procedure mubyte_update; { saves new string to mubyte tree }
var j: pool_pointer;
    p: pointer;
    q: pointer;
    in_mutree: integer;
begin
  j := str_start [str_ptr];
  if mubyte_read [so(str_pool[j])] = null then
  begin
    in_mutree := 0;
    p := get_avail;
    mubyte_read [so(str_pool[j])] := p;
    subinfo (p) := so(str_pool[j]); type (p) := 0;
  end else begin
    in_mutree := 1;
    p := mubyte_read [so(str_pool[j])];
  end;
  incr (j);
  while j < pool_ptr do
  begin
    if in_mutree = 0 then
    begin
      new_mubyte_node; subinfo (p) := so(str_pool[j]); type (p) := 0;
    end else { |in_mutree| = 1 }
      if (type (p) > 0) and (type (p) < 64) then
      begin
        type (p) := type (p) + 64;
        q := link (p); link (p) := get_avail; p := link (p);
        info (p) := q;
        new_mubyte_node; subinfo (p) := so(str_pool[j]); type (p) := 0;
        in_mutree := 0;
      end else begin
        if type (p) >= 64 then p := link (p);
        repeat
          p := link (p);
          if subinfo (info(p)) = so(str_pool[j]) then
          begin
            p := info (p);
            goto continue;
          end;
        until link (p) = null;
        new_mubyte_node; subinfo (p) := so(str_pool[j]); type (p) := 0;
        in_mutree := 0;
      end;
continue:
    incr (j);
  end;
  if in_mutree = 1 then
  begin
    if type (p) = 0 then
    begin
       type (p) := mubyte_prefix + 64;
       q := link (p);  link (p) := get_avail; p := link (p);
       link (p) := q; info (p) := mubyte_stoken;
       return;
    end;
    if type (p) >= 64 then
    begin
      type (p) := mubyte_prefix + 64;
      p := link (p); info (p) := mubyte_stoken;
      return;
    end;
  end;
  type (p) := mubyte_prefix;
  link (p) := mubyte_stoken;
exit: end;
@#
procedure dispose_munode (p: pointer); { frees a mu subtree recursivelly }
var q: pointer;
begin
  if (type (p) > 0) and (type (p) < 64) then free_avail (p)
  else begin
    if type (p) >= 64 then
    begin
      q := link (p); free_avail (p); p := q;
    end;
    q := link (p); free_avail (p); p := q;
    while p <> null do
    begin
      dispose_munode (info (p));
      q := link (p);
      free_avail (p);
      p := q;
    end;
  end;
end;
@#
procedure dispose_mutableout (cs: pointer); { frees record from out table }
var p, q, r: pointer;
begin
  p := mubyte_cswrite [cs mod 128];
  r := null;
  while p <> null do
    if info (p) = cs then
    begin
      if r <> null then link (r) := link (link (p))
      else mubyte_cswrite[cs mod 128] := link (link (p));
      q := link (link(p));
      free_avail (link(p)); free_avail (p);
      p := q;
    end else begin
      r := link (p); p := link (r);
    end;
end;

@ The |print_buffer| procedure prints one character from |buffer|[|i|].
It also increases |i| to the next character in the buffer.

@<Basic printing...@>=
{ print one char from |buffer|[|i|]. |i| should have been of type
  0..|buf_size|, but web2c doesn't like that construct in argument lists. }
procedure print_buffer(var i:integer);
var c: ASCII_code;
begin
  if mubyte_in = 0 then print (buffer[i]) { normal TeX }
  else if mubyte_log > 0 then print_char (buffer[i])
       else begin
         c := read_buffer (i);
         if mubyte_token > 0 then print_cs (mubyte_token-cs_token_flag)
         else print (c);
       end;
  incr (i);
end;

@ Additional material to dump for enc\TeX.  This includes whether
enc\TeX is enabled, and if it is we also have to dump the \.{\\mubyte}
arrays.

@<Dump enc\TeX-specific data@>=
dump_int(@"45435458);  {enc\TeX's magic constant: "ECTX"}
if not enctex_p then dump_int(0)
else begin
  dump_int(1);
  dump_things(mubyte_read[0], 256);
  dump_things(mubyte_write[0], 256);
  dump_things(mubyte_cswrite[0], 128);
end;

@ Undumping the additional material we dumped for enc\TeX.  This includes
conditionally undumping the \.{\\mubyte} arrays.

@<Undump enc\TeX-specific data@>=
undump_int(x);   {check magic constant of enc\TeX}
if x<>@"45435458 then goto bad_fmt;
undump_int(x);   {undump |enctex_p| flag into |enctex_enabled_p|}
if x=0 then enctex_enabled_p:=false
else if x<>1 then goto bad_fmt
else begin
  enctex_enabled_p:=true;
  undump_things(mubyte_read[0], 256);
  undump_things(mubyte_write[0], 256);
  undump_things(mubyte_cswrite[0], 128);
end;


@* \[54] System-dependent changes.
@z