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+% This macro source file is from the four volume series
+% "TeX in Practice" by Stephan von Bechtolsheim, published
+% 1993 by Springer-Verlag, New York.
+% Copyright 1993 Stephan von Bechtolsheim.
+% No warranty or liability is assumed.
+% This macro may be copied freely if no fees other than
+% media cost or shipping charges are charged and as long
+% as this copyright and the following source code itself
+% is not changed. Please see the series for further information.
+%
+% Version: 1.0
+% Date: May 1, 1993
+%
+%
+% This source code is documented in 15.2.6, p. II-237.
+% Original source in file "fonts1.TEX", starting line 538.
+\wlog{L: "strleng.tip" ["fonts1.TEX," l. 538, p. II-237]}%
+% This file DOES belong to format "texip."
+\newcount\StringLengthResult
+\catcode`\@ = 11
+\newbox\@StringLengthBoxA
+\newbox\@StringLengthBoxB
+\def\StringLength #1{%
+ \setbox\@StringLengthBoxA = \hbox{\tt #1}%
+ \setbox\@StringLengthBoxB = \hbox{\tt A}%
+ \StringLengthResult = \wd\@StringLengthBoxA
+ \divide\StringLengthResult by \wd\@StringLengthBoxB
+}
+\catcode`\@ = 12