Tuneup for CWEB 4.9.

Fix issues #61, #62, and #64; clarify issue #63.

Use iftex.sty to test for TeX engine.
Revert a few occurrences of '\ifacro', synonymous for '\ifpdf'.

'$' is permitted in C identifiers (CTANGLE).
Add option '+u' for CTANGLE (poor man's UTF-8 transliteration).

Improve PDF validation, following advice from 3-Height PDF Validator.
NOS has 'count \I' subentries.

Makefile.unix

@@ -4,7 +4,7 @@
 # Copyright (C) 1987,1990,1993,2000 Silvio Levy and Donald E. Knuth
 #
 # Modified for GCC under Linux by Andreas Scherer, June 8, 1996.
-# Last updated by Andreas Scherer, February 2022.
+# Last updated by Andreas Scherer, August 2022.
 
 # The following copyright notice extends to the changes in this Makefile
 # only, not to any part of the original CWEB distribution.
@@ -182,7 +182,7 @@ COMMPATCH = comm-extensions.ch comm-extensions.hch \
 	comm-output.ch comm-output.hch \
 	comm-patch.ch comm-texlive.ch comm-texlive.hch
 CTANGPATCH = ctang-i18n.ch ctang-newpage.ch ctang-output.ch \
-	ctang-patch.ch ctang-texlive.ch
+	ctang-patch.ch ctang-texlive.ch ctang+u.ch
 CWEAVPATCH = cweav-extensions.ch prod-cweave.ch cweav-i18n.ch cweav-newpage.ch \
 	cweav-output.ch cweav-patch.ch cweav-texlive.ch cwtw-texlive.ch
 CTWILLPATCH = cweav-twill.ch prod-twill.ch ctwill-texlive.ch ctwill-man.ch
@@ -400,7 +400,7 @@ $(CCHANGES): common.w comm-patch.ch comm-extensions.ch \
 $(HCHANGES): common.h comm-extensions.hch \
 	comm-output.hch comm-i18n.hch # comm-texlive.hch
 	$(TIE) -m $@ $^
-$(TCHANGES): ctangle.w ctang-patch.ch \
+$(TCHANGES): ctangle.w ctang-patch.ch ctang+u.ch \
 	ctang-output.ch ctang-i18n.ch # ctang-texlive.ch
 	$(TIE) -c $@ $^; $(SUBVER)
 $(WCHANGES): cweave.w cweav-patch.ch cweav-extensions.ch \

README.md

@@ -4,7 +4,7 @@
 [cweb system](http://www-cs-faculty.stanford.edu/~uno/cweb.html)
 and donald e. knuth's [ctwill program](http://ftp.cs.stanford.edu/pub/ctwill).
 it requires the contents of [the original *cweb* source
-drop](https://github.com/ascherer/cweb/releases/download/cweb-4.8/cweb-4.8.tar.gz)
+drop](https://github.com/ascherer/cweb/releases/download/cweb-4.9/cweb-4.9.tar.gz)
 and [the secondary *ctwill* source
 drop](http://ftp.cs.stanford.edu/pub/ctwill/ctwill.tar.gz), to which it applies
 a set of change files to introduce advanced features. see the extensive
@@ -23,11 +23,11 @@ a set of change files to introduce advanced features. see the extensive
 
 ## manual compilation
 
-extract `ctwill.tar.gz` and add the contents of `cweb-4.8.tar.gz` (overwriting
+extract `ctwill.tar.gz` and add the contents of `cweb-4.9.tar.gz` (overwriting
 outdated source files `Makefile`, `common.h`, `common.w`, and `prod.w`) and
-`cwebbin-2022.2.tar.gz` for the full set of source files.
+`cwebbin-2023.tar.gz` for the full set of source files.
 replace `@@VERSION@@` in line 129 of the `Makefile.unix` with something like
-`Version 4.8 [CWEBbin 2022.2]`.
+`Version 4.9 [CWEBbin 2023]`.
 `touch *.cxx`.
 unix/linux users should work with [`make -f Makefile.unix`](Makefile.unix)
 exclusively (targets `boot`, `cautiously`, and `all`).
@@ -47,8 +47,8 @@ clone
 [cweb](https://github.com/ascherer/cweb) and
 [cwebbin](https://github.com/ascherer/cwebbin), create the source drops with
 ```
-git archive -o cweb-4.8.tar.gz cweb-4.8
-git archive -o cwebbin-2022.2.tar.gz cwebbin-2022.2
+git archive -o cweb-4.9.tar.gz cweb-4.9
+git archive -o cwebbin-2023.tar.gz cwebbin-2023
 ```
 respectively, put these two tarballs and the original `ctwill.tar.gz` in the
 *SOURCES* directory, add the patch files
@@ -95,5 +95,5 @@ macros, and cweb include files.
 updated versions of **cweb** are added to the texlive source tree with
 ```
 cd /path/to/texlive-source/texk/web2c/cwebdir
-pax -rzf /path/to/cweb-4.8.tar.gz
+pax -rzf /path/to/cweb-4.9.tar.gz
 ```

README.txt

@@ -1,12 +1,12 @@
 							-*-Text-*-
 %%% LEGALESE %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-% This file is part of CWEBbin (Version 4.8 [2022]).
+% This file is part of CWEBbin (Version 4.9 [2023]).
 % (Set TAB to 8 spaces to get the spacing right.)
 % The CWEB programs by Silvio Levy are based on programs by D. E. Knuth.
 % They are distributed WITHOUT ANY WARRANTY, express or implied.
 
-% This README file was last updated June 5, 2022 by Andreas Scherer.
+% This README file was last updated May 15, 2023 by Andreas Scherer.
 
 % The following copyright notices extend to the respective parts of the
 % changed or added source code introduced in this patch only, not to the
@@ -16,7 +16,7 @@
 % Copyright (C) 1991-1993 Hans-Hermann Bode
 % Copyright (C) 1992 Klaus Guntermann
 % Copyright (C) 1991,1993 Carsten Steger
-% Copyright (C) 1993-2000,2005,2011,2018–2022 Andreas Scherer
+% Copyright (C) 1993-2000,2005,2011,2018–2023 Andreas Scherer
 
 % Permission is granted to make and distribute verbatim copies of this
 % document provided that the copyright notice and this permission notice
@@ -55,11 +55,11 @@ CWEB 4.0 (and higher) can be retrieved from
 
 	https://github.com/ascherer/cweb
 
-To apply this patched version of CWEB, extract the patch archive (yielding a
-new subdirectory) and add the original distribution.  Care has been taken to
-avoid collisions with any files from the original distribution and the
-Makefiles provide a target to cleanly remove the patch leaving only the files
-of the original distribution (and vice versa).
+To apply this patched version of CWEB, extract the patch archive and add the
+contents of the original distribution.  Care has been taken to avoid
+collisions with any files from the original distribution and the Makefiles
+provide a target to cleanly remove the patch leaving only the files of the
+original distribution (and vice versa).
 
 Intermediate files with extensions .tex and .cxx are reproducable from the
 general sources by means of an executable ctangle, cweave, and an ANSI-C/C++
@@ -68,9 +68,12 @@ available at
 
 	CTAN: https://ctan.org/pkg/tie
 
-TIE should be available on all systems with a recent TeX installation.
-Alternatively, you can also try to use Julian Gilbey's CTIE processor, but
-intermediate results are different.
+To produce the CWEB source code of the CTWILL program from the original CWEAVE
+source, you need Julian Gilbey's CTIE processor, which is available at
+
+	CTAN: https://ctan.org/pkg/ctie
+
+C/TIE should be available on all systems with a recent TeX installation.
 
 %%% TABLE OF CONTENTS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
@@ -81,6 +84,7 @@ GENERAL CONTRIBUTION:
 ├── 0001-Support-extended-syntax-for-numeric-literals.patch	for CTWILL
 ├── 0002-Purge-redundant-TeX-macro.patch			for CTWILL
 ├── 0003-Adapt-to-CWEB-4.5.patch				for CTWILL
+├── 0004-Add-silent-datecontentspage-macro.patch		for CTWILL
 ├── comm-extensions.ch			change file for common.w
 ├── comm-extensions.hch			change file for common.h
 ├── comm-i18n.ch			change file for common.w
@@ -251,10 +255,13 @@ GENERAL CONTRIBUTION:
 	itself.  (Otherwise the source files common.w and ctangle.w won't
 	actually have been used.)
 
-	5. After all is set, you should become `superuser' and run `make -f
-	Makefile.unix install'; this will install the binaries, the TeX macros
-	and CWEB @include files, and some documentation in places specified in
-	Makefile.unix.
+	5. <Obsolete>After all is set, you should become `superuser' and run
+	`make -f Makefile.unix install'; this will install the binaries, the
+	TeX macros and CWEB @include files, and some documentation in places
+	specified in Makefile.unix.</Obsolete>
+	Please follow the instructions in README.md for 'advanced packaging'.
+	deb- and rpm-packages not only can be installed, but also cleanly
+	uninstalled from all system paths.
 
 	6. If you want a full documentation of the tangle and weave programs,
 	type `make -f Makefile.unix docs' or preferably `make -f Makefile.unix
@@ -392,11 +399,6 @@ I want to express my deep gratitude to Silvio Levy and Donald Knuth for the
 marvelous tool they provided us with.  Also I am indepted to my various pre-
 and co-workers on whose initial ideas and contributions this package is based.
 
-
 Happy CWEBbin'!
 
-June 5, 2022
-
-Andreas Scherer
-
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

comm-mini.ch

@@ -1,9 +1,9 @@
 Limbo.
 
 @x
-\def\title{Common code for CTANGLE and CWEAVE (Version 4.8 [CWEBbin 2022])}
+\def\title{Common code for CTANGLE and CWEAVE (Version 4.9 [CWEBbin 2023])}
 @y
-\def\title{COMMON (Version 4.8 [CWEBbin 2022])}
+\def\title{COMMON (Version 4.9 [CWEBbin 2023])}
 \def\contentspagenumber{0}
 @z
 

comm-patch.ch

@@ -1,6 +1,6 @@
 								-*-Web-*-
 This file, COMM-FOO.CH, is part of CWEBBIN (@VERSION@).
-It is a changefile for COMMON.W, Version 4.8.
+It is a changefile for COMMON.W, Version 4.9.
 
 Technically, COMM-FOO.CH is constructed from a multitude of separate change
 files by applying Klaus Guntermann's TIE processor.  Any comments (like this
@@ -182,17 +182,19 @@ p21	29 October 2005	AS	ANSI C++ patches to patch level [p21].
 
 2022	05 February 2022	AS	Tuneup for CWEB 4.7 [2022].
 	05 June 2022		AS	Tuneup for CWEB 4.8 [2022].
+
+2023	15 May 2023		AS	Tuneup for CWEB 4.9 [2023].
 ------------------------------------------------------------------------------
 Material in limbo.
 
 @x l.25
-\def\title{Common code for CTANGLE and CWEAVE (Version 4.8)}
+\def\title{Common code for CTANGLE and CWEAVE (Version 4.9)}
 @y
 \def\title{Common code for CTANGLE and CWEAVE (@VERSION@)}
 @z
 
 @x l.30
-  \centerline{(Version 4.8)}
+  \centerline{(Version 4.9)}
 @y
   \centerline{(@VERSION@)}
 @z

comm-texlive.ch

@@ -13,13 +13,13 @@ Material in limbo.
 \def\title{Common code for CTANGLE and CWEAVE (@VERSION@)}
 @y
 \def\Kpathsea/{{\mc KPATHSEA\spacefactor1000}} \ifacro\sanitizecommand\Kpathsea{KPATHSEA}\fi
-\def\title{Common code for CTANGLE and CWEAVE (4.8 [\TeX~Live])}
+\def\title{Common code for CTANGLE and CWEAVE (4.9 [\TeX~Live])}
 @z
 
 @x l.30 and l.191 of COMM-PATCH.CH
   \centerline{(@VERSION@)}
 @y
-  \centerline{(Version 4.8 [\TeX~Live])}
+  \centerline{(Version 4.9 [\TeX~Live])}
 @z
 
 @x l.32

common.cxx

@@ -582,8 +582,8 @@ fatal(_("! Cannot open output file "),tex_file_name);
 static boolean input_ln(
 FILE*fp)
 {
-register int c= EOF;
-register char*k;
+int c= EOF;
+char*k;
 if(feof(fp))return false;
 limit= k= buffer;
 while(k<=buffer_end&&(c= getc(fp))!=EOF&&c!='\n')
@@ -1370,7 +1370,7 @@ scan_args(void)
 {
 char*dot_pos;
 char*name_pos;
-register char*s;
+char*s;
 boolean found_web= false,found_change= false,found_out= false;
 
 

ctang+u.ch

@@ -0,0 +1,56 @@
+Changes for CTANGLE.W by Andreas Scherer.
+
+This set of changes extends CTANGLE's transliteration mechanism to ``poor man's
+UTF-8'' by stripping all but the last of a sequence of high-bit bytes
+representing a multi-byte character.
+
+Section 59.
+
+@x l.712
+@ @<Case of an identifier@>=@t\1\quad@>
+@y
+@ Nowadays, most computer files are encoded in some form of ``Unicode''. A very
+convenient special case is ``UTF-8'', a variable-length multi-byte encoding. In
+order to avoid major surgery for the transliteration feature---as tempting as
+the extended notation \.{@@l c3bc ue} might be---, \.{CTANGLE}
+accepts the \.{+u} option to activate a ``poor man's UTF-8'' mechanism. The
+first in a sequence of up to four high-bit bytes (amounting to more than
+$2^{20}$~possible character representations) determines the number of bytes
+used to represent the next character. Instead of extending the |translit| table
+to this multi-byte scenario, we simply strip all but the last byte and use this
+as the transliteration index.
+
+% Exercise 11.6 from the TeXbook:
+\def\frac#1/#2{\leavevmode\kern.1em\raise.5ex\hbox{\the\scriptfont0 #1}
+  \kern-.1em/\kern-.15em\lower.25ex\hbox{\the\scriptfont0 #2}}
+
+\&{Example:} While in ``classic ASCII'' the German word {\it gr\"un\/} could be
+treated with transliteration \.{@@l fc ue} (from codepage ISO/IEC~8859-1) to
+get \.{gruen} as suggested above, in UTF-8 you'd be advised to use \.{@@l bc
+ue} instead, because character {\it \"u\/} (latin small letter u with
+diaeresis) is encoded as the two-byte sequence \.{c3 bc}, indicated by the
+initial three bits of byte \.{c3} (\.{1100 0011}). Note that this simple
+approach leads to the collision with character $\frac1/4$ (vulgar fraction one
+quarter) with its two-byte encoding \.{c2 bc}.
+
+@d transliterate_utf_eight flags['u']
+
+@<Case of an identifier@>=@t\1\quad@>
+@z
+
+@x l.717
+    if ((eight_bits)(*j)<0200) C_putc(*j);
+@^high-bit character handling@>
+    else C_printf("%s",translit[(eight_bits)(*j)-0200]);
+@y
+    if (ishigh(*j)) {
+@^high-bit character handling@>
+      if (transliterate_utf_eight) {
+        if ((eight_bits)(*j)>=0360) j+=3;
+        else if ((eight_bits)(*j)>=0340) j+=2;
+        else if ((eight_bits)(*j)>=0300) j+=1;
+      }
+      C_printf("%s",translit[(eight_bits)(*j)-0200]);
+    }
+    else C_putc(*j);
+@z

ctang-patch.ch

@@ -166,17 +166,19 @@ p21	29 October 2005	AS	ANSI C++ patches for patch level [p21].
 
 2022	05 February 2022	AS	tuneup for CWEB 4.7 [2022].
 	05 June 2022		AS	tuneup for CWEB 4.8 [2022].
+
+2023	15 May 2023		AS	tuneup for CWEB 4.9 [2023].
 ------------------------------------------------------------------------------
 Material in limbo.
 
 @x l.30
-\def\title{CTANGLE (Version 4.8)}
+\def\title{CTANGLE (Version 4.9)}
 @y
 \def\title{CTANGLE (@VERSION@)}
 @z
 
 @x l.34
-  \centerline{(Version 4.8)}
+  \centerline{(Version 4.9)}
 @y
   \centerline{(@VERSION@)}
 @z
@@ -192,7 +194,7 @@ z
 Section 1.
 
 @x l.64
-@d banner "This is CTANGLE (Version 4.8)"
+@d banner "This is CTANGLE (Version 4.9)"
 @y
 @d banner "This is CTANGLE (@VERSION@)"
 @z

ctang-texlive.ch

@@ -12,13 +12,13 @@ Material in limbo.
 @x l.30 and l.169 of CTANG-PATCH.CH
 \def\title{CTANGLE (@VERSION@)}
 @y
-\def\title{CTANGLE (Version 4.8 [\TeX~Live])}
+\def\title{CTANGLE (Version 4.9 [\TeX~Live])}
 @z
 
 @x l.34 and l.175 of CTANG-PATCH.CH
   \centerline{(@VERSION@)}
 @y
-  \centerline{(Version 4.8 [\TeX~Live])}
+  \centerline{(Version 4.9 [\TeX~Live])}
 @z
 
 @x l.36
@@ -38,7 +38,7 @@ Section 1.
 @x l.64 and l.188 of CTANG-PATCH.CH and l.17 of CTANG-I18N.CH
 @d banner _("This is CTANGLE (@VERSION@)")
 @y
-@d banner "This is CTANGLE, Version 4.8"
+@d banner "This is CTANGLE, Version 4.9"
   /* will be extended by the \TeX~Live |versionstring| */
 @z