Add libdjup logging

1 files changed, 56 insertions, 0 deletions

diff --git a/lib/log.c b/lib/log.c
new file mode 100644
index 0000000..51ab107
--- /dev/null
+++ b/lib/log.c
@@ -0,0 +1,56 @@
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+#include "log.h"
+
+/* Message buffer */
+#define MBUF_SIZE 512
+
+static void (*log_output)(int level, const char *source, int line, const char *msg) = NULL;
+static int min_level = LOGL_INFO;
+
+void
+dp_log_set_output(void (*output)(int, const char *, int, const char *))
+{
+	log_output = output;
+}
+
+void
+dp_log_set_level(int level)
+{
+	min_level = level;
+}
+
+void
+dp_log_write(int level, const char *source, int line, const char *fmt, ...)
+{
+	char mbuf[MBUF_SIZE];
+	char *msg;
+	va_list va;
+	int len;
+
+	if (level < min_level)
+		return;
+	if (!log_output)
+		return;
+
+	msg = mbuf;
+	va_start(va, fmt);
+	len = vsnprintf(msg, MBUF_SIZE, fmt, va);
+	va_end(va);
+
+	if (len >= MBUF_SIZE)
+	{
+		msg = (char *)malloc(len + 1);
+		va_start(va, fmt);
+		len = vsnprintf(msg, len + 1, fmt, va);
+		va_end(va);
+	}
+
+	log_output(level, source, line, msg);
+
+	if (msg != mbuf)
+		free(msg);
+}