1 files changed, 57 insertions, 0 deletions
diff --git a/src/log.h b/src/log.h
new file mode 100644
index 0000000..a9df317
--- /dev/null
+++ b/src/log.h
@@ -0,0 +1,57 @@
+#ifndef LOG_H
+#define LOG_H
+
+#define LOG_LEVEL_DEBUG 0
+#define LOG_LEVEL_INFO 1
+#define LOG_LEVEL_WARNING 2
+#define LOG_LEVEL_ERROR 3
+
+#if !defined(LOG_LEVEL)
+#define LOG_LEVEL (LOG_LEVEL_ERROR+1)
+#else
+#include <stdio.h>
+#include <string.h>
+static inline const char *log_basename(const char *s)
+{
+#if !defined(_WIN32)
+    const char *p = strrchr(s, '/');
+#else
+    const char *p = strrchr(s, '\\');
+#endif
+
+    if (p)
+        return p+1;
+
+    return s;
+}
+#endif
+
+#define LOG_DOLOG(level, fmt, ...) \
+    fprintf(stderr, "%s %s %s:%d " fmt "\n", \
+        #level, __FUNCTION__, log_basename(__FILE__), __LINE__, ##__VA_ARGS__)
+
+#if (LOG_LEVEL <= LOG_LEVEL_DEBUG)
+#define LOG_DEBUG(FMT, ...) LOG_DOLOG(DEBUG, FMT, ##__VA_ARGS__)
+#else
+#define LOG_DEBUG(FMT, ...)
+#endif
+
+#if (LOG_LEVEL <= LOG_LEVEL_INFO)
+#define LOG_INFO(FMT, ...) LOG_DOLOG(INFO, FMT, ##__VA_ARGS__)
+#else
+#define LOG_INFO(FMT, ...)
+#endif
+
+#if (LOG_LEVEL <= LOG_LEVEL_WARNING)
+#define LOG_WARNING(FMT, ...) LOG_DOLOG(WARNING, FMT, ##__VA_ARGS__)
+#else
+#define LOG_WARNING(FMT, ...)
+#endif
+
+#if (LOG_LEVEL <= LOG_LEVEL_ERROR)
+#define LOG_ERROR(FMT, ...) LOG_DOLOG(ERROR, FMT, ##__VA_ARGS__)
+#else
+#define LOG_ERROR(FMT, ...)
+#endif
+
+#endif