Add support for syntax highlighting of C/C++ code.

DOCUMENTATION.md

@@ -128,6 +128,9 @@ exceptions:
 - Support for `#widthNN` in image URLs to scale images to 25, 33, 50, 66, 75,
   and 100% width.
 
+- Support for the "c" and "cpp" languages for syntax highlighting in fenced
+  code text.
+
 - Support for tables as used by the
   [Github Flavored Markdown Spec](https://github.github.com/gfm).
 
@@ -424,6 +427,13 @@ p.code, pre, ul.code li {
   padding: 10px;
   page-break-inside: avoid;
 }
+pre.numbered code {
+  counter-increment: line;
+}
+pre.numbered code:before {
+  color: gray;
+  content: counter(line) "  ";
+}
 a:link, a:visited {
   text-decoration: none;
 }
@@ -505,6 +515,22 @@ table.list td {
 h2.title, h3.title {
   border-bottom: solid 2px gray;
 }
+/* Syntax highlighting */
+span.comment {
+  color: darkgreen;
+}
+span.directive {
+  color: purple;
+}
+span.number {
+  color: orange;
+}
+span.reserved {
+  color: blue;
+}
+span.string {
+  color: magenta;
+}
 /* Dark mode overrides */
 @media (prefers-color-scheme: dark) {
   body {

Makefile

@@ -48,12 +48,12 @@ sanitizer:
 
 TESTOPTIONS	=	\
 			--author "Michael R Sweet" \
-			--body DOCUMENTATION.md \
+			--body testfiles/body.md \
 			--copyright "Copyright © 2003-2019 by Michael R Sweet" \
 			--coverimage codedoc-256.png \
 			--docversion $(VERSION) \
 			--title "Test Documentation" \
-			--footer README.md
+			--footer DOCUMENTATION.md
 
 test:		codedoc
 	rm -f test.xml

README.md

@@ -16,6 +16,7 @@ utility.
 Changes in v3.6
 ---------------
 
+- Added support for syntax highlighting of C and C++ code.
 - Added support for literal links (functions, types, etc.) using the "@@"
   target.
 - Added support for markdown-style block quotes in comments.