diff --git a/README b/README
index 7de3f55..d445d55 100644
--- a/README
+++ b/README
@@ -1,8 +1,8 @@
 Class Library for Numbers
 
 Copyright (c)      Bruno Haible 1988-2008
-Copyright (c)   Richard Kreckel 2000-2009
-Copyright (c) Alexei Sheplyakov 2008
+Copyright (c)   Richard Kreckel 2000-2012
+Copyright (c) Alexei Sheplyakov 2008-2010
 
 GPL
 
diff --git a/doc/cln.texi b/doc/cln.texi
index 354cacc..d5ed502 100644
--- a/doc/cln.texi
+++ b/doc/cln.texi
@@ -36,7 +36,7 @@ Published by Bruno Haible, @code{<haible@@clisp.cons.org>} and
 Richard B. Kreckel, @code{<kreckel@@ginac.de>}.
 
 Copyright (C)  Bruno Haible 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008.
-Copyright (C)  Richard B. Kreckel 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011.
+Copyright (C)  Richard B. Kreckel 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012.
 Copyright (C)  Alexei Sheplyakov 2008, 2010.
 
 Permission is granted to make and distribute verbatim copies of
diff --git a/src/base/cl_free.cc b/src/base/cl_free.cc
index ccda8af..a829aa2 100644
--- a/src/base/cl_free.cc
+++ b/src/base/cl_free.cc
@@ -34,8 +34,8 @@ void cl_free_heap_object (cl_heap* pointer)
 static const char * copyright_notice[] = {
   "                                                                    \n"
   "Copyright (c)      Bruno Haible 1988-2008                           \n"
-  "Copyright (c)   Richard Kreckel 2000-2009                           \n"
-  "Copyright (c) Alexei Sheplyakov 2008                                \n"
+  "Copyright (c)   Richard Kreckel 2000-2012                           \n"
+  "Copyright (c) Alexei Sheplyakov 2008-2010                           \n"
   "                                                                    \n"
   "This program is free software; you can redistribute it and/or modify\n"
   "it under the terms of the GNU General Public License as published by\n"
diff --git a/src/complex/input/cl_N_read_stream.cc b/src/complex/input/cl_N_read_stream.cc
index 139af04..fc207aa 100644
--- a/src/complex/input/cl_N_read_stream.cc
+++ b/src/complex/input/cl_N_read_stream.cc
@@ -91,13 +91,10 @@ const cl_N read_complex (std::istream& stream, const cl_read_flags& flags)
 		goto syntax1;
 	loop {
 		buffer.push(c);
-		c = stream.get();
-		if (stream.eof() || stream.fail())
-			break;
-		if (!number_char_p(c)) {
-			stream.putback(c);
+		c = stream.peek();  // Avoid fail state on EOF.
+		if (stream.eof() || stream.fail() || !number_char_p(c))
 			break;
-		}
+		c = stream.get();
 	}
 done:
 	// Parse the number.
diff --git a/src/float/input/cl_F_read_stream.cc b/src/float/input/cl_F_read_stream.cc
index baafc3b..044e4d6 100644
--- a/src/float/input/cl_F_read_stream.cc
+++ b/src/float/input/cl_F_read_stream.cc
@@ -82,13 +82,10 @@ const cl_F read_float (std::istream& stream, const cl_read_flags& flags)
 		goto syntax1;
 	loop {
 		buffer.push(c);
-		c = stream.get();
-		if (stream.eof() || stream.fail())
-			break;
-		if (!number_char_p(c)) {
-			stream.putback(c);
+		c = stream.peek();  // Avoid fail state on EOF.
+		if (stream.eof() || stream.fail() || !number_char_p(c))
 			break;
-		}
+		c = stream.get();
 	}
 	// Parse the number.
 	return read_float(flags,
diff --git a/src/integer/input/cl_I_read_stream.cc b/src/integer/input/cl_I_read_stream.cc
index 227d845..b242ae7 100644
--- a/src/integer/input/cl_I_read_stream.cc
+++ b/src/integer/input/cl_I_read_stream.cc
@@ -82,13 +82,10 @@ const cl_I read_integer (std::istream& stream, const cl_read_flags& flags)
 		goto syntax1;
 	loop {
 		buffer.push(c);
-		c = stream.get();
-		if (stream.eof() || stream.fail())
-			break;
-		if (!number_char_p(c)) {
-			stream.putback(c);
+		c = stream.peek();  // Avoid fail state on EOF.
+		if (stream.eof() || stream.fail() || !number_char_p(c))
 			break;
-		}
+		c = stream.get();
 	}
 	// Parse the number.
 	return read_integer(flags,
diff --git a/src/rational/input/cl_RA_read_stream.cc b/src/rational/input/cl_RA_read_stream.cc
index bba1d03..9e5f4f6 100644
--- a/src/rational/input/cl_RA_read_stream.cc
+++ b/src/rational/input/cl_RA_read_stream.cc
@@ -83,13 +83,10 @@ const cl_RA read_rational (std::istream& stream, const cl_read_flags& flags)
 		goto syntax1;
 	loop {
 		buffer.push(c);
-		c = stream.get();
-		if (stream.eof() || stream.fail())
-			break;
-		if (!number_char_p(c)) {
-			stream.putback(c);
+		c = stream.peek();  // Avoid fail state on EOF.
+		if (stream.eof() || stream.fail() || !number_char_p(c))
 			break;
-		}
+		c = stream.get();
 	}
 	// Parse the number.
 	return read_rational(flags,
diff --git a/src/real/input/cl_R_read_stream.cc b/src/real/input/cl_R_read_stream.cc
index 56b01d3..c032eee 100644
--- a/src/real/input/cl_R_read_stream.cc
+++ b/src/real/input/cl_R_read_stream.cc
@@ -82,13 +82,10 @@ const cl_R read_real (std::istream& stream, const cl_read_flags& flags)
 		goto syntax1;
 	loop {
 		buffer.push(c);
-		c = stream.get();
-		if (stream.eof() || stream.fail())
-			break;
-		if (!number_char_p(c)) {
-			stream.putback(c);
+		c = stream.peek();  // Avoid fail state on EOF.
+		if (stream.eof() || stream.fail() || !number_char_p(c))
 			break;
-		}
+		c = stream.get();
 	}
 	// Parse the number.
 	return read_real(flags,