1 files changed, 52 insertions, 0 deletions
diff --git a/src/trace.c b/src/trace.c
new file mode 100644
index 0000000..742f819
--- /dev/null
+++ b/src/trace.c
@@ -0,0 +1,52 @@
+/*
+ * Author Jerry Lundström <jerry@dns-oarc.net>
+ * Copyright (c) 2019, OARC, Inc.
+ * All rights reserved.
+ *
+ * This file is part of the dnswire library.
+ *
+ * dnswire library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * dnswire library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with dnswire library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "dnswire/trace.h"
+
+#if DNSWIRE_TRACE
+const char* __printable_string(const uint8_t* data, size_t len)
+{
+    static char buf[512];
+    size_t      r = 0, w = 0;
+
+    while (r < len && w < sizeof(buf) - 1) {
+        if (isprint(data[r])) {
+            buf[w++] = data[r++];
+        } else {
+            if (w + 4 >= sizeof(buf) - 1) {
+                break;
+            }
+
+            sprintf(&buf[w], "\\x%02x", data[r++]);
+            w += 4;
+        }
+    }
+    if (w >= sizeof(buf)) {
+        buf[sizeof(buf) - 1] = 0;
+    } else {
+        buf[w] = 0;
+    }
+
+    return buf;
+}
+#endif