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
|
@q Changes for CWEB in TeX Live from numerous contributors. @>
@q This file is in the Public Domain. @>
@q Most of the original Kpathsea changes by Wlodek Bzyl and Olaf Weber @>
@q were merged with the set of change files of the CWEBbin project; @>
@q see https://github.com/ascherer/cwebbin for the original parts. @>
@q This stripped change file {comm,ctang,cweav,ctwill}-w2c.ch has been @>
@q created from the set of change files {comm,ctang,cweav}-patch.ch, @>
@q {comm,ctang,cweav}-ansi.ch, {comm,ctang,cweav}-extensions.ch, @>
@q {comm,ctang,cweav}-output.ch, {comm,ctang,cweav}-i18n.ch, and @>
@q cweav-twill.ch for CTWILL, and {comm,ctang,cweav,ctwill}-texlive.ch @>
@q with the 'tie' processor and is used as a monolithic changefile for @>
@q {common,ctangle,cweave}.w in TeX Live. @>
@q Please send comments, suggestions, etc. to tex-k@@tug.org. @>
@x
\def\title{CTANGLE (Version 3.64)}
@y
\def\title{CTANGLE (Version 3.64 [\TeX~Live])}
@z
@x
\centerline{(Version 3.64)}
@y
\centerline{(Version 3.64 [\TeX~Live])}
@z
@x
\def\botofcontents{\vfill
@y
\def\covernote{\vbox{
@z
@x
}
@y
}}
\datecontentspage
@z
@x
@s not_eq normal @q unreserve a C++ keyword @>
@y
@z
@x
@d banner "This is CTANGLE (Version 3.64)\n"
@y
@d banner "This is CTANGLE, Version 3.64"
/* will be extended by the \TeX~Live |versionstring| */
@z
@x
@ We predeclare several standard system functions here instead of including
their system header files, because the names of the header files are not as
standard as the names of the functions. (For example, some \CEE/ environments
have \.{<string.h>} where others have \.{<strings.h>}.)
@<Predecl...@>=
extern int strlen(); /* length of string */
extern int strcmp(); /* compare strings lexicographically */
extern char* strcpy(); /* copy one string to another */
extern int strncmp(); /* compare up to $n$ string characters */
extern char* strncpy(); /* copy up to $n$ string characters */
@y
@ For string handling we include the {\mc ANSI C} system header file instead
of predeclaring the standard system functions |@!strlen|, |@!strcmp|,
|@!strcpy|, |@!strncmp|, and |@!strncpy|.
@^system dependencies@>
@<Include files@>=
#include <string.h>
@z
@x
int main (ac, av)
int ac;
char **av;
@y
int main (
int ac,
char **av)
@z
@x
if (show_banner) printf(banner); /* print a ``banner line'' */
@y
if (show_banner) cb_show_banner(); /* print a ``banner line'' */
@z
@x
@d max_bytes 90000 /* the number of bytes in identifiers,
@y
@d max_bytes 1000000 /* the number of bytes in identifiers,
@z
@x
@d max_toks 270000 /* number of bytes in compressed \CEE/ code */
@d max_names 4000 /* number of identifiers, strings, section names;
@y
@d max_toks 1000000 /* number of bytes in compressed \CEE/ code */
@d max_names 10239 /* number of identifiers, strings, section names;
@z
@x
@d max_texts 2500 /* number of replacement texts, must be less than 10240 */
@d hash_size 353 /* should be prime; used in |"common.w"| */
@y
@d max_texts 10239 /* number of replacement texts, must be less than 10240 */
@d hash_size 8501 /* should be prime; used in |"common.w"| */
@z
@x
@d buf_size 100 /* for \.{CWEAVE} and \.{CTANGLE} */
@y
@d buf_size 1000 /* for \.{CWEAVE} and \.{CTANGLE} */
@z
@x
@i common.h
@y
@i comm-w2c.h
@z
@x
the array |text_info|, and we use a |text_pointer| variable to refer
@y
the array |text_info|, and we use a \&{text\_pointer} variable to refer
@z
@x
If your machine does not support |unsigned char| you should change
the definition of \&{eight\_bits} to |unsigned short|.
@^system dependencies@>
@y
@z
@x
name_dir->equiv=(char *)text_info; /* the undefined section has no replacement text */
@y
init_node(name_dir); /* the undefined section has no replacement text */
@z
@x
int names_match(p,first,l)
name_pointer p; /* points to the proposed match */
char *first; /* position of first character of string */
int l; /* length of identifier */
{
@y
boolean names_match(@t\1\1@>
name_pointer p, /* points to the proposed match */
const char *first, /* position of first character of string */
size_t l, /* length of identifier */
eight_bits t@t\2\2@>) /* not used by \.{TANGLE} */
{@+(void)t;
@z
@x
void
init_node(node)
name_pointer node;
@y
void
init_node(
name_pointer node)
@z
@x
node->equiv=(char *)text_info;
@y
node->equiv=(void *)text_info;
@z
@x
void
init_p() {}
@y
void
init_p(name_pointer p,eight_bits t) {@+(void)p;@+(void)t;@+}
@z
@x
void
store_two_bytes(x)
sixteen_bits x;
@y
static void
store_two_bytes(
sixteen_bits x)
@z
@x
if (tok_ptr+2>tok_mem_end) overflow("token");
@y
if (tok_ptr+2>tok_mem_end) overflow(_("token"));
@z
@x
void
push_level(p) /* suspends the current level */
name_pointer p;
@y
static void
push_level(@t\1\1@> /* suspends the current level */
name_pointer p@t\2\2@>)
@z
@x
if (stack_ptr==stack_end) overflow("stack");
@y
if (stack_ptr==stack_end) overflow(_("stack"));
@z
@x
void
pop_level(flag) /* do this when |cur_byte| reaches |cur_end| */
int flag; /* |flag==0| means we are in |output_defs| */
@y
static void
pop_level(@t\1\1@> /* do this when |cur_byte| reaches |cur_end| */
int flag@t\2\2@>) /* |flag==0| means we are in |output_defs| */
@z
@x
void
get_output() /* sends next token to |out_char| */
@y
static void
get_output(void) /* sends next token to |out_char| */
@z
@x
if ((a+name_dir)->equiv!=(char *)text_info) push_level(a+name_dir);
@y
if ((a+name_dir)->equiv!=(void *)text_info) push_level(a+name_dir);
@z
@x
printf("\n! Not present: <");
@y
fputs(_("\n! Not present: <"),stdout);
@z
@x
void
flush_buffer() /* writes one line to output file */
@y
static void
flush_buffer(void) /* writes one line to output file */
@z
@x
overflow("output files");
@y
overflow(_("output files"));
@z
@x
void phase_two();
@y
static void phase_two(void);@/
@z
@x
void
phase_two () {
@y
static void
phase_two (void) {
@z
@x
printf("\n! No program text was specified."); mark_harmless;
@y
fputs(_("\n! No program text was specified."),stdout); mark_harmless;
@z
@x
printf("\nWriting the output file (%s):",C_file_name);
@y
printf(_("\nWriting the output file (%s):"),C_file_name);
@z
@x
printf("\nWriting the output files:");
@y
fputs(_("\nWriting the output files:"),stdout);
@z
@x
if(show_happiness) printf("\nDone.");
@y
if (show_happiness) {
if (show_progress) new_line;
fputs(_("Done."),stdout);
}
@z
@x
@<Write all the named output files@>=
for (an_output_file=end_output_files; an_output_file>cur_out_file;) {
an_output_file--;
sprint_section_name(output_file_name,*an_output_file);
fclose(C_file);
C_file=fopen(output_file_name,"w");
if (C_file ==0) fatal("! Cannot open output file:",output_file_name);
@.Cannot open output file@>
printf("\n(%s)",output_file_name); update_terminal;
cur_line=1;
stack_ptr=stack+1;
cur_name= (*an_output_file);
cur_repl= (text_pointer)cur_name->equiv;
cur_byte=cur_repl->tok_start;
cur_end=(cur_repl+1)->tok_start;
while (stack_ptr > stack) get_output();
flush_buffer();
}
@y
@<Write all the named output files@>=
fclose(C_file); C_file=NULL;
@<Update the primary result when it has changed@>@;
for (an_output_file=end_output_files; an_output_file>cur_out_file;) {
an_output_file--;
sprint_section_name(output_file_name,*an_output_file);
if ((C_file=fopen(output_file_name,"a"))==NULL)
fatal(_("! Cannot open output file "),output_file_name);
@.Cannot open output file@>
else fclose(C_file); /* Test accessability */
if((C_file=fopen(check_file_name,"wb"))==NULL)
fatal(_("! Cannot open output file "),check_file_name);
if (show_progress) { printf("\n(%s)",output_file_name); update_terminal; }
cur_line=1;
stack_ptr=stack+1;
cur_name= (*an_output_file);
cur_repl= (text_pointer)cur_name->equiv;
cur_byte=cur_repl->tok_start;
cur_end=(cur_repl+1)->tok_start;
while (stack_ptr > stack) get_output();
flush_buffer(); fclose(C_file); C_file=NULL;
@<Update the secondary results when they have changed@>@;
}
strcpy(check_file_name,""); /* We want to get rid of the temporary file */
@z
@x
void output_defs();
@y
static void output_defs(void);@/
@z
@x
void
output_defs()
@y
static void
output_defs(void)
@z
@x
else if (a<050000) { confusion("macro defs have strange char");}
@y
else if (a<050000) { confusion(_("macro defs have strange char"));}
@z
@x
static void out_char();
@y
static void out_char(eight_bits);@/
@z
@x
static void
out_char(cur_char)
eight_bits cur_char;
@y
static void
out_char(
eight_bits cur_char)
@z
@x
@ @<Cases like \.{!=}@>=
case plus_plus: C_putc('+'); C_putc('+'); out_state=normal; break;
case minus_minus: C_putc('-'); C_putc('-'); out_state=normal; break;
case minus_gt: C_putc('-'); C_putc('>'); out_state=normal; break;
case gt_gt: C_putc('>'); C_putc('>'); out_state=normal; break;
case eq_eq: C_putc('='); C_putc('='); out_state=normal; break;
case lt_lt: C_putc('<'); C_putc('<'); out_state=normal; break;
case gt_eq: C_putc('>'); C_putc('='); out_state=normal; break;
case lt_eq: C_putc('<'); C_putc('='); out_state=normal; break;
case not_eq: C_putc('!'); C_putc('='); out_state=normal; break;
case and_and: C_putc('&'); C_putc('&'); out_state=normal; break;
case or_or: C_putc('|'); C_putc('|'); out_state=normal; break;
case dot_dot_dot: C_putc('.'); C_putc('.'); C_putc('.'); out_state=normal;
break;
case colon_colon: C_putc(':'); C_putc(':'); out_state=normal; break;
case period_ast: C_putc('.'); C_putc('*'); out_state=normal; break;
case minus_gt_ast: C_putc('-'); C_putc('>'); C_putc('*'); out_state=normal;
break;
@y
@ @<Cases like \.{!=}@>=
case plus_plus: C_putc('+');@+C_putc('+'); out_state=normal; break;
case minus_minus: C_putc('-');@+C_putc('-'); out_state=normal; break;
case minus_gt: C_putc('-');@+C_putc('>'); out_state=normal; break;
case gt_gt: C_putc('>');@+C_putc('>'); out_state=normal; break;
case eq_eq: C_putc('=');@+C_putc('='); out_state=normal; break;
case lt_lt: C_putc('<');@+C_putc('<'); out_state=normal; break;
case gt_eq: C_putc('>');@+C_putc('='); out_state=normal; break;
case lt_eq: C_putc('<');@+C_putc('='); out_state=normal; break;
case non_eq: C_putc('!');@+C_putc('='); out_state=normal; break;
case and_and: C_putc('&');@+C_putc('&'); out_state=normal; break;
case or_or: C_putc('|');@+C_putc('|'); out_state=normal; break;
case dot_dot_dot: C_putc('.');@+C_putc('.');@+C_putc('.'); out_state=normal;
break;
case colon_colon: C_putc(':');@+C_putc(':'); out_state=normal; break;
case period_ast: C_putc('.');@+C_putc('*'); out_state=normal; break;
case minus_gt_ast: C_putc('-');@+C_putc('>');@+C_putc('*'); out_state=normal;
break;
@z
@x
eight_bits
skip_ahead() /* skip to next control code */
@y
static eight_bits
skip_ahead(void) /* skip to next control code */
@z
@x
int skip_comment(is_long_comment) /* skips over comments */
boolean is_long_comment;
@y
static boolean skip_comment(@t\1\1@> /* skips over comments */
boolean is_long_comment@t\2\2@>)
@z
@x
err_print("! Input ended in mid-comment");
@y
err_print(_("! Input ended in mid-comment"));
@z
@x
err_print("! Section name ended in mid-comment"); loc--;
@y
err_print(_("! Section name ended in mid-comment")); loc--;
@z
@x
eight_bits
get_next() /* produces the next input token */
@y
static eight_bits
get_next(void) /* produces the next input token */
@z
@x
else if (c=='\'' || c=='"' || (c=='L'&&(*loc=='\'' || *loc=='"')))
@y
else if (c=='\'' || c=='"'@|
|| ((c=='L' || c=='u' || c=='U')&&(*loc=='\'' || *loc=='"'))@|
|| ((c=='u' && *loc=='8')&&(*(loc+1)=='\'' || *(loc+1)=='"')))
@z
@x
else if (*loc=='>') if (*(loc+1)=='*') {loc++; compress(minus_gt_ast);}
else compress(minus_gt); break;
@y
else { if (*loc=='>') { if (*(loc+1)=='*') {loc++; compress(minus_gt_ast);}
else compress(minus_gt); } } break;
@z
@x
case '!': if (*loc=='=') compress(not_eq); break;
@y
case '!': if (*loc=='=') compress(non_eq); break;
@z
@x
while (isalpha(*++loc) || isdigit(*loc) || isxalpha(*loc) || ishigh(*loc));
@y
while (isalpha((eight_bits)*++loc) || isdigit((eight_bits)*loc) @|
|| isxalpha((eight_bits)*loc) || ishigh((eight_bits)*loc));
@z
@x
if (delim=='L') { /* wide character constant */
delim=*loc++; *++id_loc=delim;
}
@y
if (delim=='L' || delim=='u' || delim=='U') { /* wide character constant */
if (delim=='u' && *loc=='8') { *++id_loc=*loc++; }
delim=*loc++; *++id_loc=delim;
}
@z
@x
err_print("! String didn't end"); loc=limit; break;
@y
err_print(_("! String didn't end")); loc=limit; break;
@z
@x
err_print("! Input ended in middle of string"); loc=buffer; break;
@y
err_print(_("! Input ended in middle of string")); loc=buffer; break;
@z
@x
printf("\n! String too long: ");
@y
fputs(_("\n! String too long: "),stdout);
@z
@x
case translit_code: err_print("! Use @@l in limbo only"); continue;
@y
case translit_code: err_print(_("! Use @@l in limbo only")); continue;
@z
@x
err_print("! Double @@ should be used in control text");
@y
err_print(_("! Double @@ should be used in control text"));
@z
@x
err_print("! Double @@ should be used in ASCII constant");
@y
err_print(_("! Double @@ should be used in ASCII constant"));
@z
@x
err_print("! String didn't end"); loc=limit-1; break;
@y
err_print(_("! String didn't end")); loc=limit-1; break;
@z
@x
err_print("! Input ended in section name");
@y
err_print(_("! Input ended in section name"));
@z
@x
printf("\n! Section name too long: ");
@y
fputs(_("\n! Section name too long: "),stdout);
@z
@x
err_print("! Section name didn't end"); break;
@y
err_print(_("! Section name didn't end")); break;
@z
@x
err_print("! Nesting of section names not allowed"); break;
@y
err_print(_("! Nesting of section names not allowed")); break;
@z
@x
if (loc>=limit) err_print("! Verbatim string didn't end");
@y
if (loc>=limit) err_print(_("! Verbatim string didn't end"));
@z
@x
@d app_repl(c) {if (tok_ptr==tok_mem_end) overflow("token"); *tok_ptr++=c;}
@y
@d app_repl(c) {if (tok_ptr==tok_mem_end) overflow(_("token")); *tok_ptr++=c;}
@z
@x
void
scan_repl(t) /* creates a replacement text */
eight_bits t;
@y
static void
scan_repl(@t\1\1@> /* creates a replacement text */
eight_bits t@t\2\2@>)
@z
@x
if (text_ptr>text_info_end) overflow("text");
@y
if (text_ptr>text_info_end) overflow(_("text"));
@z
@x
{int a=id_lookup(id_first,id_loc,0)-name_dir; app_repl((a / 0400)+0200);
app_repl(a % 0400);}
@y
{int a_l=id_lookup(id_first,id_loc,0)-name_dir; app_repl((a_l / 0400)+0200);
app_repl(a_l % 0400);}
@z
@x
case output_defs_code: if (t!=section_name) err_print("! Misplaced @@h");
@y
case output_defs_code: if (t!=section_name) err_print(_("! Misplaced @@h"));
@z
@x
err_print("! @@d, @@f and @@c are ignored in C text"); continue;
@y
err_print(_("! @@d, @@f and @@c are ignored in C text")); continue;
@z
@x
if (*try_loc=='=') err_print ("! Missing `@@ ' before a named section");
@y
if (*try_loc=='=') err_print (_("! Missing `@@ ' before a named section"));
@z
@x
else err_print("! Double @@ should be used in string");
@y
else err_print(_("! Double @@ should be used in string"));
@z
@x
c=toupper(*id_first)-'A'+10;
@y
c=toupper((eight_bits)*id_first)-'A'+10;
@z
@x
c=16*c+toupper(*id_first)-'A'+10;
@y
c=16*c+toupper((eight_bits)*id_first)-'A'+10;
@z
@x
default: err_print("! Unrecognized escape sequence");
@y
default: err_print(_("! Unrecognized escape sequence"));
@z
@x
void
scan_section()
@y
static void
scan_section(void)
@z
@x
err_print("! Definition flushed, must start with identifier");
@y
err_print(_("! Definition flushed, must start with identifier"));
@z
@x
else if (p->equiv==(char *)text_info) p->equiv=(char *)cur_text;
@y
else if (p->equiv==(void *)text_info) p->equiv=(void *)cur_text;
@z
@x
void phase_one();
@y
static void phase_one(void);@/
@z
@x
void
phase_one() {
@y
static void
phase_one(void) {
@z
@x
void skip_limbo();
@y
static void skip_limbo(void);@/
@z
@x
void
skip_limbo()
@y
static void
skip_limbo(void)
@z
@x
err_print("! Double @@ should be used in control text");
@y
err_print(_("! Double @@ should be used in control text"));
@z
@x
default: err_print("! Double @@ should be used in limbo");
@y
default: err_print(_("! Double @@ should be used in limbo"));
@z
@x
err_print("! Improper hex number following @@l");
@y
err_print(_("! Improper hex number following @@l"));
@z
@x
err_print("! Replacement string in @@l too long");
@y
err_print(_("! Replacement string in @@l too long"));
@z
@x
strncpy(translit[i-0200],beg,loc-beg);
@y
strncpy(translit[i-0200],beg,(size_t)(loc-beg));
@z
@x
void
print_stats() {
@y
void
print_stats(void) {
@z
@x
printf("\nMemory usage statistics:\n");
printf("%ld names (out of %ld)\n",
(long)(name_ptr-name_dir),(long)max_names);
printf("%ld replacement texts (out of %ld)\n",
(long)(text_ptr-text_info),(long)max_texts);
printf("%ld bytes (out of %ld)\n",
(long)(byte_ptr-byte_mem),(long)max_bytes);
printf("%ld tokens (out of %ld)\n",
@y
puts(_("\nMemory usage statistics:"));
printf(_("%ld names (out of %ld)\n"),
(long)(name_ptr-name_dir),(long)max_names);
printf(_("%ld replacement texts (out of %ld)\n"),
(long)(text_ptr-text_info),(long)max_texts);
printf(_("%ld bytes (out of %ld)\n"),
(long)(byte_ptr-byte_mem),(long)max_bytes);
printf(_("%ld tokens (out of %ld)\n"),
@z
@x
@** Index.
@y
@** Extensions for modern \.{CWEB}.
The following sections introduce code changes and extensions that have been
created by numerous contributors over the course of a quarter century. They
make \.{CWEB} adhere to modern coding standards and introduce new or improved
features.
Care has been taken to keep the original section numbering intact, so this new
section should have the same number as the original ``\&{96.~Index},'' and
additional material follows below.
@* Function declarations. Here are declarations---conforming to
{\mc ANSI~C}---of all functions in this code, as far as they are
not already in |"common.h"|. These are private to \.{CTANGLE}.
@<Predecl...@>=
static eight_bits get_next(void);@/
static eight_bits skip_ahead(void);@/
static boolean skip_comment(boolean);@/
static void flush_buffer(void);@/
static void get_output(void);@/
static void pop_level(int);@/
static void push_level(name_pointer);@/
static void scan_repl(eight_bits);@/
static void scan_section(void);@/
static void store_two_bytes(sixteen_bits);@/
@* Output file update. Most \CEE/ projects are controlled by a
\.{Makefile} that automatically takes care of the temporal dependecies
between the different source modules. It is suitable that \.{CWEB} doesn't
create new output for all existing files, when there are only changes to
some of them. Thus the \.{make} process will only recompile those modules
where necessary. The idea and basic implementation of this mechanism can
be found in the program \.{NUWEB} by Preston Briggs, to whom credit is due.
@<Update the primary result...@>=
if((C_file=fopen(C_file_name,"r"))!=NULL) {
@<Set up the comparison of temporary output@>@;
@<Create the primary output depending on the comparison@>@;
} else
rename(check_file_name,C_file_name); /* This was the first run */
@ @<Set up the comparison of temporary output@>=
char x[BUFSIZ],y[BUFSIZ];
int x_size,y_size,comparison=false;
if((check_file=fopen(check_file_name,"r"))==NULL)
fatal(_("! Cannot open output file "),check_file_name);
@.Cannot open output file@>
if (temporary_output) @<Compare the temporary output...@>@;
fclose(C_file); C_file=NULL;
fclose(check_file); check_file=NULL;
@ We hope that this runs fast on most systems.
@<Compare the temporary output to the previous output@>=
do {
x_size = fread(x,1,BUFSIZ,C_file);
y_size = fread(y,1,BUFSIZ,check_file);
comparison = (x_size == y_size); /* Do not merge these statements! */
if(comparison) comparison = !memcmp(x,y,x_size);
} while(comparison && !feof(C_file) && !feof(check_file));
@ Note the superfluous call to |remove| before |rename|. We're using it to
get around a bug in some implementations of |rename|.
@<Create the primary output...@>=
if(comparison)
remove(check_file_name); /* The output remains untouched */
else {
remove(C_file_name);
rename(check_file_name,C_file_name);
}
@ The author of a \.{CWEB} program may want to write the \\{secondary} output
instead of to a file (in \.{@@(...@@>}) to \.{/dev/null} or \.{/dev/stdout} or
\.{/dev/stderr}. We must take care of the \\{temporary} output already written
to a file and finally get rid of that file.
@<Update the secondary results...@>=
if(0==strcmp("/dev/stdout",output_file_name))
@<Redirect temporary output to \.{/dev/stdout}@>@;
else if(0==strcmp("/dev/stderr",output_file_name))
@<Redirect temporary output to \.{/dev/stderr}@>@;
else if(0==strcmp("/dev/null",output_file_name))
@<Redirect temporary output to \.{/dev/null}@>@;
else { /* Hopefully a \\{regular} output file */
if((C_file=fopen(output_file_name,"r"))!=NULL) {
@<Set up the comparison of temporary output@>@;
@<Create the secondary output depending on the comparison@>@;
} else
rename(check_file_name,output_file_name); /* This was the first run */
}
@ Again, we use a call to |remove| before |rename|.
@<Create the secondary output...@>=
if(comparison)
remove(check_file_name); /* The output remains untouched */
else {
remove(output_file_name);
rename(check_file_name,output_file_name);
}
@ @<Redirect temporary output to \.{/dev/stdout}@>={
@<Setup system redirection@>@;
do {
in_size = fread(in_buf,1,BUFSIZ,check_file);
in_buf[in_size]='\0';
fprintf(stdout,"%s",in_buf);
} while(!feof(check_file));@/
fclose(check_file); check_file=NULL;
@<Create the secondary output...@>@;
}
@ @<Redirect temporary output to \.{/dev/stderr}@>={
@<Setup system redirection@>@;
do {
in_size = fread(in_buf,1,BUFSIZ,check_file);
in_buf[in_size]='\0';
fprintf(stderr,"%s",in_buf);
} while(!feof(check_file));@/
fclose(check_file); check_file=NULL;
@<Create the secondary output...@>@;
}
@ @<Redirect temporary output to \.{/dev/null}@>={
int comparison=true;
@<Create the secondary output...@>@;
}
@ @<Setup system redirection@>=
char in_buf[BUFSIZ+1];
int in_size,comparison=true;
if((check_file=fopen(check_file_name,"r"))==NULL)
fatal("! Cannot open output file ",check_file_name);
@.Cannot open output file@>
@* Put ``version'' information in a single spot.
Don't do this at home, kids! Push our local macro to the variable in \.{COMMON}
for printing the |banner| and the |versionstring| from there.
@d max_banner 50
@<Common code...@>=
extern char cb_banner[];
@ @<Set init...@>=
strncpy(cb_banner,banner,max_banner-1);
@** Index.
@z
|