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diff -up grep-2.5.3/src/search.c.bz479152 grep-2.5.3/src/search.c
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--- grep-2.5.3/src/search.c.bz479152	2009-01-08 09:57:12.000000000 +0100
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+++ grep-2.5.3/src/search.c	2009-01-08 09:58:57.000000000 +0100
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@@ -757,7 +757,7 @@ EXECUTE_FCT(Fexecute)
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   const char *last_char = NULL;
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 #endif /* MBS_SUPPORT */
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-  for (beg = start_ptr ? start_ptr : buf; beg <= buf + size; beg++)
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+  for (beg = start_ptr ? start_ptr : buf; beg < buf + size; beg++)
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     {
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       size_t offset = kwsexec (kwset, beg, buf + size - beg, &kwsmatch);
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       if (offset == (size_t) -1)