1 files changed, 93 insertions, 0 deletions
diff --git a/TPM2-Plugin/lib/log.c b/TPM2-Plugin/lib/log.c
new file mode 100644
index 0000000..14797e4
--- /dev/null
+++ b/TPM2-Plugin/lib/log.c
@@ -0,0 +1,93 @@
+//**********************************************************************;
+// Copyright (c) 2017, Intel Corporation
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice,
+// this list of conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice,
+// this list of conditions and the following disclaimer in the documentation
+// and/or other materials provided with the distribution.
+//
+// 3. Neither the name of Intel Corporation nor the names of its contributors
+// may be used to endorse or promote products derived from this software without
+// specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+// THE POSSIBILITY OF SUCH DAMAGE.
+//**********************************************************************;
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+#include "log.h"
+
+/*
+ * Note that the logging library is not thread safe, thus calls on separate
+ * threads will yield an interleaved output on stderr.
+ */
+
+static log_level current_log_level = log_level_warning;
+
+void
+log_set_level (log_level value)
+{
+    current_log_level = value;
+}
+
+static const char *
+get_level_msg (log_level level)
+{
+    const char *value = "UNK";
+    switch (level)
+    {
+        case log_level_error:
+            value = "ERROR";
+            break;
+        case log_level_warning:
+            value = "WARN";
+            break;
+        case log_level_verbose:
+            value = "INFO";
+    }
+    return value;
+}
+
+void
+_log (log_level level, const char *file, unsigned lineno, const char *fmt, ...)
+{
+
+    /* Skip printing messages outside of the log level */
+    if (level > current_log_level)
+        return;
+
+    va_list argptr;
+    va_start(argptr, fmt);
+
+    /* Verbose output prints file and line on error */
+    if (current_log_level >= log_level_verbose)
+        fprintf (stderr, "%s on line: \"%u\" in file: \"%s\": ",
+                 get_level_msg (level), lineno, file);
+    else
+        fprintf (stderr, "%s: ", get_level_msg (level));
+
+    /* Print the user supplied message */
+    vfprintf (stderr, fmt, argptr);
+
+    /* always add a new line so the user doesn't have to */
+    fprintf (stderr, "\n");
+
+    va_end(argptr);
+}