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diff -up texlive-2007/texk/web2c/bibtex.ch.poolfix texlive-2007/texk/web2c/bibtex.ch
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--- texlive-2007/texk/web2c/bibtex.ch.poolfix 2006-12-27 00:37:34.000000000 +0100
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+++ texlive-2007/texk/web2c/bibtex.ch 2009-10-16 06:55:52.000000000 +0200
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@@ -1134,6 +1134,15 @@ while ((ex_buf_xptr < ex_buf_ptr) and
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@y
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@z
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+% Forgot to check for pool overflow here. Triggered by test case linked
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+% from http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=520920.
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+@x
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+while (sp_ptr < sp_end) do {shift the substring}
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+@y
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+str_room(sp_end - sp_ptr);
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+while (sp_ptr < sp_end) do {shift the substring}
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+@z
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+
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% [459] Eliminate unreferenced statement label, because `undefined' is
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% now a constant expression that is not evaluated at the Web level. If
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% this label were ever required, it could be replaced by the constant
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