upquote

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+\NeedsTeXFormat{LaTeX2e}[1995/12/01]
+\ProvidesPackage{upquote}[2003/08/11 v1.1 Covington's upright-quote
+                          modification to verbatim and verb]
+
+%% Copyright 2000 Michael A. Covington.
+%% Copyright 2003 Michael A. Covington, Frank Mittelbach.
+%%
+%% It may be distributed and/or modified under the
+%% conditions of the LaTeX Project Public License, either version 1.2
+%% of this license or (at your option) any later version.
+%% The latest version of this license is in
+%%    http://www.latex-project.org/lppl.txt
+%% and version 1.2 or later is part of all distributions of LaTeX
+%% version 1999/12/01 or later.
+%%
+
+% Problem: Computer Modern Typewriter is the best font for program listings,
+%           *but* it prints ` ' as bent opening and closing single quotes.
+%           Other fonts, and most programming languages, print ` as a grave
+%           accent and ' upright; ' is used both to open and to close quoted
+%           strings.
+
+%           See also M. Covington, "Computer Languages in Type," Journal of
+%           Scholarly Publishing 26.1:34-41 (1994).
+
+% Solution: This package switches the typewriter font to Computer Modern
+%           Typewriter (regardless of other fonts in use, so long as this
+%           package is called afterward) and modifies the behavior of
+%           verbatim, verbatim*, verb, and verb* to print ` ' the desired way.
+%           It does not affect \tt, \texttt, etc.
+
+% Author:   Michael A. Covington
+%           Artificial Intelligence Center
+%           The University of Georgia
+%           http://www.ai.uga.edu/~mc
+%
+%           and
+%
+%           Covington Innovations (Consulting and Typesetting)
+%           http://www.CovingtonInnovations.com
+
+% The modification is done by adding instructions to \@noligs,
+% which is called by verbatim and verb in order to turn the
+% characters ` < > , ' - into active characters that merely
+% print themselves rather than activating ligatures.
+%
+% What is added is code to redefine ` as grave and ' as upright single quote.
+%
+
+% Bug fix, 2000/12/11: previously, '0 (or ' and any digit) would print as a
+% nonexistent character.  (The reason: \char13 or \char18 was combining with
+% the digit to make \char130, etc.)  Fixed by adding curly brackets.
+
+
+
+%% Rewritten by FMi 2003/06/19
+%
+%
+% Use textcomp official chars so that change works in various
+% encodings
+%
+% Extend \@noligs (this also works with the latest listings package
+% that recognizes that the package was loaded)
+
+\RequirePackage{textcomp}
+
+\begingroup
+\catcode`'=\active               
+\catcode``=\active               
+\g@addto@macro\@noligs
+   {\let`\textasciigrave
+    \let'\textquotesingle}
+\endgroup
+
+
+\endinput