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+% standard macros for CWEB listings (in addition to plain.tex)
+% modified for use with "tex2pdf" --- March 1997
+% Version 2.0 --- Don Knuth, July 1990
+% Version 2.0 [german] --- Carsten Steger, October 1991
+% Version 2.0 [german] --- Andreas Scherer, February 1993
+% Version 2.7 --- Don Knuth, July 1992
+% Version 2.7 [p6c] --- Andreas Scherer, September 1993
+% Version 2.8 --- Don Knuth, September 1992
+% Version 2.8 [german] --- Carsten Steger, 1993
+% Version 2.8 [p7] --- Andreas Scherer, October 1993
+% Version 3.0 --- Don Knuth, June 1993
+% Version 3.0 [p8e] --- Andreas Scherer, November 1993
+% Version 3.1 [p9b] --- Andreas Scherer, January 1994
+% Version 3.1 [p9c] --- Andreas Scherer, March 1994
+% Version 3.1 [p9d] --- Andreas Scherer, July 1994
+% Version 3.2 [p10] --- Andreas Scherer, July 1994
+% Version 3.2 [p10a] --- Giuseppe Ghibò, September 1994
+% Version 3.2 [p10b] --- Andreas Scherer, October 1994
+% Version 3.3 [p11b] --- Andreas Scherer, March 1995
+% Version 3.4 [p13] --- Andreas Scherer, August 1995
+% Version 3.4 [p14] --- Andreas Scherer, March 1997
+% Version 3.42 [p15] --- Andreas Scherer, August 1998
+% Version 3.43 [p16] --- Andreas Scherer, October 1998
+% Version 3.5 [p17] --- Andreas Scherer, December 1999
+% Version 3.61 [p18] --- Andreas Scherer, July 2000
+% Version 3.63 [p19] --- Andreas Scherer, January 2001
+% Version 3.64 [p20] --- Andreas Scherer, March 2002
+% Version 3.64 [p21] --- Andreas Scherer, Octobre 2005
+% Version 3.64 [p22] --- Andreas Scherer, March 2016
+
+\ifx\undefined\documentclass\input Xcwebmac.tex
+\else\endinput\fi % LaTeX will use other macros
+
+\def\.#1{\leavevmode\hbox{\tentex % typewriter type for strings
+ \ifx\Cstringchars\undefined\else\Cstringchars\fi % special string characters
+ \let\\=\BS % backslash in a string
+ \let\{=\LB % left brace in a string
+ \let\}=\RB % right brace in a string
+ \let\~=\TL % tilde in a string
+ \let\ =\SP % space in a string
+ \let\_=\UL % underline in a string
+ \let\&=\AM % ampersand in a string
+ \let\^=\CF % circumflex in a string
+ #1\kern.05em}}
+
+\def\postATL#1 #2 {\bf lettera \\{\uppercase{\char"#1}}
+ tangles as \tentex "#2"\egroup\par}
+\def\ATH{{\acrofalse\X\kern-.5em:Definizioni preprocessore\X}}
+
+\def\A{\note{Vedi anche sezione}} % xref for doubly defined section name
+\def\As{\note{Vedi anche sezioni}} % xref for multiply defined section name
+
+\def\ET{ e~} % conjunction between two section numbers
+\def\ETs{ e~} % conjunction between the last two of several section numbers
+
+\def\Q{\note{Questo codice \`e citato nella sezione}}
+ % xref for mention of a section
+\def\Qs{\note{Questo codice \`e citato nelle sezioni}}
+ % xref for mentions of a section
+
+\def\U{\note{Questo codice \`e usato nella sezione}}
+ % xref for use of a section
+\def\Us{\note{Questo codice \`e usato nelle sezioni}}
+ % xref for uses of a section
+
+\gtitle={Output \.{CWEB}} % this running head is reset by starred sections
+\mark{\noexpand\nullsec0{\the\gtitle}}
+
+\def\ch{\note{Le seguenti sezioni sono state modificate tramite il change-file:}
+ \let\*=\relax}
+
+\def\inx{\par\vskip6pt plus 1fil % we are beginning the index
+ \def\page{\box255 } \normalbottom
+ \write\cont{} % ensure that the contents file isn't empty
+ \write\cont{\catcode `\noexpand\@=12\relax} % \makeatother
+ \closeout\cont % the contents information has been fully gathered
+ \output{\ifpagesaved\normaloutput{\box\sbox}\lheader\rheader\fi
+ \global\setbox\sbox=\page \global\pagesavedtrue}
+ \pagesavedfalse \eject % eject the page-so-far and predecessors
+ \setbox\sbox\vbox{\unvbox\sbox} % take it out of its box
+ \vsize=\pageheight \advance\vsize by -\ht\sbox % the remaining height
+ \hsize=.5\pagewidth \advance\hsize by -10pt
+ % column width for the index (20pt between cols)
+ \parfillskip 0pt plus .6\hsize % try to avoid almost empty lines
+ \def\lr{L} % this tells whether the left or right column is next
+ \output{\if L\lr\global\setbox\lbox=\page \gdef\lr{R}
+ \else\normaloutput{\vbox to\pageheight{\box\sbox\vss
+ \hbox to\pagewidth{\box\lbox\hfil\page}}}\lheader\rheader
+ \global\vsize\pageheight\gdef\lr{L}\global\pagesavedfalse\fi}
+ \message{Indice Analitico:}
+ \parskip 0pt plus .5pt
+ \outer\def\I##1, ##2.{\par\hangindent2em\noindent##1:\kern1em
+ \ifacro\pdfnote##2.\else##2\fi.} % index entry
+ \def\[##1]{$\underline{##1}$} % underlined index item
+ \rm \rightskip0pt plus 2.5em \tolerance 10000 \let\*=\lapstar
+ \hyphenpenalty 10000 \parindent0pt
+ \readindex}
+\def\fin{\par\vfill\eject % this is done when we are ending the index
+ \ifpagesaved\null\vfill\eject\fi % output a null index column
+ \if L\lr\else\null\vfill\eject\fi % finish the current page
+ \ifpdftex \makebookmarks \fi % added in Version 3.68
+ \parfillskip 0pt plus 1fil
+ \def\grouptitle{NOMI DELLE SEZIONI}
+ \let\topsecno=\nullsec
+ \message{Nomi delle sezioni:}
+ \output={\normaloutput\page\lheader\rheader}
+ \setpage
+ \def\note##1##2.{\quad{\eightrm##1~\ifacro{\pdfnote##2.}\else{##2}\fi.}}
+ \def\Q{\note{Citato nella sezione}} % crossref for mention of a section
+ \def\Qs{\note{Citato nelle sezioni}} % crossref for mentions of a section
+ \def\U{\note{Usato nella sezione}} % crossref for use of a section
+ \def\Us{\note{Usato nelle sezioni}} % crossref for uses of a section
+ \def\I{\par\hangindent 2em}\let\*=*
+ \ifacro \def\outsecname{Nomi delle sezioni} \let\Xpdf\X
+% \ifpdftex \makebookmarks \pdfdest name {NOS} fitb % in versions < 3.68
+ \ifpdftex \pdfdest name {NOS} fith % changed in version 3.69
+ \pdfoutline goto name {NOS} count -\secno {\outsecname}
+ \def\X##1:##2\X{\Xpdf##1:##2\X \firstsecno##1.%
+ {\toksF={}\makeoutlinetoks##2\outlinedone\outlinedone}%
+ \pdfoutline goto num \the\toksA \expandafter{\the\toksE}}
+ \else\ifpdf
+ \special{pdf: outline -1 << /Title (\outsecname)
+ /Dest [ @thispage /FitH @ypos ] >>}
+ \def\X##1:##2\X{\Xpdf##1:##2\X \firstsecno##1.%
+ {\toksF={}\makeoutlinetoks##2\outlinedone\outlinedone}%
+ \special{pdf: outline 0 << /Title (\the\toksE)
+ /A << /S /GoTo /D (\romannumeral\the\toksA) >> >>}}
+ \fi\fi\fi
+ \readsections}
+\def\con{\par\vfill\eject % finish the section names
+% \ifodd\pageno\else\titletrue\null\vfill\eject\fi % for duplex printers
+ \rightskip 0pt \hyphenpenalty 50 \tolerance 200
+ \setpage \output={\normaloutput\page\lheader\rheader}
+ \titletrue % prepare to output the table of contents
+ \pageno=\contentspagenumber
+ \def\grouptitle{INDICE}
+ \message{Indice:}
+ \topofcontents \startpdf
+ \line{\hfil Sezione\hbox to3em{\hss Pag.}}
+ \let\ZZ=\contentsline
+ \readcontents\relax % read the contents info
+ \botofcontents \end} % print the contents page(s) and terminate
+\def\today{\number\day\space\ifcase\month\or
+ gennaio\or febbraio\or marzo\or aprile\or maggio\or giugno\or
+ luglio\or agosto\or settembre\or ottobre\or novembre\or dicembre\fi
+ \space\number\year}
+\def\datethis{\def\startsection{\leftline{\sc\today, ore \hours}\bigskip
+ \let\startsection=\stsec\stsec}}
+ % say `\datethis' in limbo, to get your listing timestamped before section 1
+%\def\datecontentspage{% versions up to 3.65
+% \def\topofcontents{\leftline{\sc\today, ore \hours}\bigskip
+% \centerline{\titlefont\title}\vfill}} % timestamps the contents page
+\def\datecontentspage{% changed in version 3.66
+ \def\botofcontents{\vfill
+ \centerline{\covernote}
+ \bigskip
+ \leftline{\sc\today, ore \hours}}} % timestamps the contents page