libpdbg: Add logging api

To avoid churn define short-cut macros for logging using PR_ prefix.

Signed-off-by: Amitay Isaacs <amitay@ozlabs.org>

1 files changed, 59 insertions, 0 deletions

diff --git a/libpdbg/debug.c b/libpdbg/debug.c
new file mode 100644
index 0000000..64f41f6
--- /dev/null
+++ b/libpdbg/debug.c
@@ -0,0 +1,59 @@
+/* Copyright 2018 IBM Corp.
+ *
+ * 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 <stdio.h>
+#include <stdarg.h>
+
+#include "debug.h"
+
+static int pdbg_loglevel = PDBG_ERROR;
+
+static void pdbg_logfunc_default(int loglevel, const char *fmt, va_list ap)
+{
+	vfprintf(stderr, fmt, ap);
+}
+
+static pdbg_log_func_t pdbg_logfunc = pdbg_logfunc_default;
+
+void pdbg_set_logfunc(pdbg_log_func_t fn)
+{
+	if (fn == NULL)
+		return;
+
+	pdbg_logfunc = fn;
+}
+
+void pdbg_set_loglevel(int loglevel)
+{
+	if (loglevel < PDBG_ERROR)
+		pdbg_loglevel = PDBG_ERROR;
+	else if (loglevel > PDBG_DEBUG)
+		pdbg_loglevel = PDBG_DEBUG;
+	else
+		pdbg_loglevel = loglevel;
+}
+
+void pdbg_log(int loglevel, const char *fmt, ...)
+{
+	va_list ap;
+
+	if (loglevel > pdbg_loglevel)
+		return;
+
+	va_start(ap, fmt);
+	pdbg_logfunc(loglevel, fmt, ap);
+	va_end(ap);
+}