1 files changed, 63 insertions, 0 deletions

diff --git a/src/log.c b/src/log.c
new file mode 100644
index 0000000..982bdb7
--- /dev/null
+++ b/src/log.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2018 Yubico AB. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "fido.h"
+
+#ifndef FIDO_NO_DIAGNOSTIC
+
+#ifndef TLS
+#define TLS
+#endif
+
+static TLS int logging;
+
+void
+fido_log_init(void)
+{
+        logging = 1;
+}
+
+void
+fido_log_xxd(const void *buf, size_t count)
+{
+        const uint8_t   *ptr = buf;
+        size_t           i;
+
+        if (!logging)
+                return;
+
+        fprintf(stderr, "  ");
+
+        for (i = 0; i < count; i++) {
+                fprintf(stderr, "%02x ", *ptr++);
+                if ((i + 1) % 16 == 0 && i + 1 < count)
+                        fprintf(stderr, "\n  ");
+        }
+
+        fprintf(stderr, "\n");
+        fflush(stderr);
+}
+
+void
+fido_log_debug(const char *fmt, ...)
+{
+        va_list  ap;
+
+        if (!logging)
+                return;
+
+        va_start(ap, fmt);
+        vfprintf(stderr, fmt, ap);
+        va_end(ap);
+
+        fprintf(stderr, "\n");
+        fflush(stderr);
+}
+
+#endif /* !FIDO_NO_DIAGNOSTIC */