src/base64.tcl: preserve also the copyright notice from the original tcllib base64.tcl file [#9]

Author: HenrikBengtsson

Makefile

@@ -5,12 +5,15 @@ all: check-cli
 build: seguid
 
 src/base64.tcl:
+	@url=https://core.tcl-lang.org/tcllib/raw/f6bea09d4aa9768279d2b74f7ab4a114dfb7c0583beded9da44eda66e888b8f7?at=base64.tcl; \
+	tf=base64.tcl; \
+	curl --silent "$${url}" > "$${tf}"; \
 	{ \
-	  url=https://core.tcl-lang.org/tcllib/raw/f6bea09d4aa9768279d2b74f7ab4a114dfb7c0583beded9da44eda66e888b8f7?at=base64.tcl; \
-	  echo "## The following code was extracted from the tcllib source code"; \
+	  echo "## The following Base64 encode code was extracted from the tcllib source code"; \
 	  echo "## $${url}"; \
 	  echo ; \
-	  curl --silent "$${url}" | sed -n -e '/namespace eval base64 {/,$$p' | sed -e '/# ::base64::decode --/,$$d' | sed 's/ decode//'; \
+	  head -n 19 "$${tf}"; \
+	  sed -n -e '/namespace eval base64 {/,$$p' "$${tf}" | sed -e '/# ::base64::decode --/,$$d' | sed 's/ decode//'; \
 	} >> "$@"
 
 seguid: src/seguid.tcl src/base64.tcl src/sha1.tcl

src/base64.tcl

@@ -1,6 +1,25 @@
-## The following code was extracted from the tcllib source code
+## The following Base64 encode code was extracted from the tcllib source code
 ## https://core.tcl-lang.org/tcllib/raw/f6bea09d4aa9768279d2b74f7ab4a114dfb7c0583beded9da44eda66e888b8f7?at=base64.tcl
 
+# base64.tcl --
+#
+# Encode/Decode base64 for a string
+# Stephen Uhler / Brent Welch (c) 1997 Sun Microsystems
+# The decoder was done for exmh by Chris Garrigues
+#
+# Copyright (c) 1998-2000 by Ajuba Solutions.
+# See the file "license.terms" for information on usage and redistribution
+# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+
+# Version 1.0   implemented Base64_Encode, Base64_Decode
+# Version 2.0   uses the base64 namespace
+# Version 2.1   fixes various decode bugs and adds options to encode
+# Version 2.2   is much faster, Tcl8.0 compatible
+# Version 2.2.1 bugfixes
+# Version 2.2.2 bugfixes
+# Version 2.3   bugfixes and extended to support Trf
+# Version 2.4.x bugfixes
+
     namespace eval base64 {
 	variable base64 {}
 	variable base64_en {}