From 4c517210730be69bba7bdbe4951e0afd8fb139e8 Mon Sep 17 00:00:00 2001
From: Peter Wu <peter@lekensteyn.nl>
Date: Mon, 7 Apr 2014 23:33:10 +0200
Subject: lib: add debug helpers

---
 lib/debug.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/debug.h | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 90 insertions(+)
 create mode 100644 lib/debug.c
 create mode 100644 lib/debug.h

diff --git a/lib/debug.c b/lib/debug.c
new file mode 100644
index 0000000..1c789de
--- /dev/null
+++ b/lib/debug.c
@@ -0,0 +1,55 @@
+/*
+ * Debugging facilities.
+ *
+ * Copyright (C) 2014 Peter Wu <peter@lekensteyn.nl>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stddef.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include "debug.h"
+
+#ifdef ENABLE_TRACING
+static bool debug_enabled;
+
+void trace_log(const char *fmt, ...)
+{
+	va_list ap;
+	if (debug_enabled) {
+		vprintf(fmt, ap);
+	}
+	va_end(ap);
+}
+
+void trace_dump_data(const char *tag, const uint8_t *data, size_t len)
+{
+	if (!debug_enabled) {
+		return;
+	}
+
+	/* do not mess with stderr colors */
+	fflush(NULL);
+	printf("\033[34m");
+	printf("%s: ", tag);
+	while (len-- > 0) {
+		printf("%02x%c", *(data++),
+		                  len == 0 ? '\n' : ' ');
+	}
+	printf("\033[m");
+	fflush(NULL);
+}
+#endif
diff --git a/lib/debug.h b/lib/debug.h
new file mode 100644
index 0000000..5bd6c42
--- /dev/null
+++ b/lib/debug.h
@@ -0,0 +1,35 @@
+/*
+ * Debugging facilities.
+ *
+ * Copyright (C) 2014 Peter Wu <peter@lekensteyn.nl>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef DEBUG_H
+#define DEBUG_H
+#include <stdint.h>
+
+#ifdef ENABLE_TRACING
+void trace_dump_data(const char *tag, const uint8_t *data, size_t len);
+
+void trace_log(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
+#else
+#define U __attribute__((__unused__))
+static inline void trace_dump_data(const char U *tag, const uint8_t U *data, size_t U len) { }
+
+static inline void trace_log(const char U *fmt, ...) {}
+#undef U
+#endif
+#endif
-- 
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