Add a basic logging implementation

2 files changed, 53 insertions, 0 deletions

diff --git a/src/logging.cpp b/src/logging.cpp
new file mode 100644
index 0000000..66b9fa8
--- /dev/null
+++ b/src/logging.cpp
@@ -0,0 +1,46 @@
+/* Copyright 2016 OpenMarket Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "olm/logging.hh"
+
+#include <cstdarg>
+#include <cstdio>
+
+namespace olm {
+
+static unsigned int log_level = 1;
+
+void set_log_level(unsigned int level) {
+    log_level = level;
+}
+
+void logf(unsigned int level, const char *category,
+          const char *format, ...) {
+    if (level > log_level) {
+        return;
+    }
+
+    fputs(category, stdout);
+    fputs(": ", stdout);
+
+    va_list ap;
+    va_start(ap, format);
+    vprintf(format, ap);
+    va_end(ap);
+
+    putchar('\n');
+}
+
+} // namespace olm
diff --git a/src/olm.cpp b/src/olm.cpp
index 63f3d83..6db8724 100644
--- a/src/olm.cpp
+++ b/src/olm.cpp
@@ -19,6 +19,7 @@
 #include "olm/base64.hh"
 #include "olm/cipher.hh"
 #include "olm/memory.hh"
+#include "olm/logging.hh"
 
 #include <new>
 #include <cstring>
@@ -818,4 +819,10 @@ size_t olm_ed25519_verify(
     );
 }
 
+void olm_set_log_level(
+    unsigned int level
+) {
+    olm::set_log_level(level);
+}
+
 }