Don't escape backspace or form feed for ntriples.

git-svn-id: http://svn.drobilla.net/serd/trunk@440 490d8e77-9747-427b-9fa3-0b8f29cee8a0

src/writer.c

@@ -305,11 +305,15 @@ write_text(SerdWriter* writer, TextContext ctx,
 			case '\n': len += sink("\\n", 2, writer);  continue;
 			case '\r': len += sink("\\r", 2, writer);  continue;
 			case '\t': len += sink("\\t", 2, writer);  continue;
-			case '\b': len += sink("\\b", 2, writer);  continue;
-			case '\f': len += sink("\\f", 2, writer);  continue;
 			case '"':  len += sink("\\\"", 2, writer); continue;
 			default: break;
 			}
+			if (writer->syntax != SERD_NTRIPLES) {
+				switch (in) {
+				case '\b': len += sink("\\b", 2, writer); continue;
+				case '\f': len += sink("\\f", 2, writer); continue;
+				}
+			}
 		}
 
 		size_t size = 0;

tests/good/test-backspace.nt

@@ -1,3 +1,3 @@
-<http://example.org/thing> <http://example.org/label> "\b" .
-<http://example.org/thing> <http://example.org/label> "\b" .
-<http://example.org/thing> <http://example.org/label> "\n\b\n" .
+<http://example.org/thing> <http://example.org/label> "\u0008" .
+<http://example.org/thing> <http://example.org/label> "\u0008" .
+<http://example.org/thing> <http://example.org/label> "\n\u0008\n" .