From 087328c3214b7411f19664ea2abb4d1dab4e5618 Mon Sep 17 00:00:00 2001
From: Al <albarrentine@gmail.com>
Date: Tue, 3 Mar 2015 12:38:10 -0500
Subject: [PATCH] [utils] logging

---
 src/log/log.h | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/log/log.h

diff --git a/src/log/log.h b/src/log/log.h
new file mode 100644
index 00000000..8cfca9b1
--- /dev/null
+++ b/src/log/log.h
@@ -0,0 +1,62 @@
+#ifndef LOG_H
+#define LOG_H
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#define LOG_LEVEL_DEBUG 10
+#define LOG_LEVEL_INFO 20
+#define LOG_LEVEL_WARN 30
+#define LOG_LEVEL_ERROR 40
+
+#ifndef LOG_LEVEL
+#define LOG_LEVEL LOG_LEVEL_INFO
+#endif
+
+#define __FILENAME__ (strrchr(__FILE__, '/') ? strrchr(__FILE__, '/') + 1 : __FILE__)
+
+#if LOG_LEVEL > LOG_LEVEL_DEBUG
+#define NO_DEBUG 1
+#endif
+
+#ifdef NO_DEBUG
+/* compile with all debug messages removed */
+#define log_debug(M, ...)
+#else
+#ifdef LOG_NO_COLORS
+  #define log_debug(M, ...) fprintf(stderr, "DEBUG " M " at %s (%s:%d) \n", ##__VA_ARGS__, __func__, __FILE__, __LINE__)
+#else
+  #define log_debug(M, ...) fprintf(stderr, "\33[34mDEBUG\33[39m " M "  \33[90m at %s (%s:%d) \33[39m\n", ##__VA_ARGS__, __func__, __FILE__, __LINE__)
+#endif /* NOCOLORS */
+#endif /* NDEBUG */
+
+/* safe readable version of errno */
+#define clean_errno() (errno == 0 ? "None" : strerror(errno))
+
+#ifdef LOG_NO_COLORS
+  #define log_error(M, ...) fprintf(stderr,  "ERR   " M " at %s (%s:%d) errno:%s\n", ##__VA_ARGS__, __func__, __FILE__, __LINE__, clean_errno())
+  #define log_warn(M, ...) fprintf(stderr, "WARN  " M " at %s (%s:%d) errno:%s\n", ##__VA_ARGS__, __func__, __FILE__, __LINE__, clean_errno())
+  #define log_info(M, ...) fprintf(stderr, "INFO  " M " at %s (%s:%d)\n", ##__VA_ARGS__, __func__, __FILENAME__, __LINE__)
+#else
+  #define log_error(M, ...) fprintf(stderr,  "\33[31mERR\33[39m   " M "  \33[90m at %s (%s:%d) \33[94merrno: %s\33[39m\n", ##__VA_ARGS__, __func__, __FILE__, __LINE__, clean_errno())
+  #define log_warn(M, ...) fprintf(stderr, "\33[91mWARN\33[39m  " M "  \33[90m at %s (%s:%d) \33[94merrno: %s\33[39m\n", ##__VA_ARGS__, __func__, __FILE__, __LINE__, clean_errno())
+  #define log_info(M, ...) fprintf(stderr, "\33[32mINFO\33[39m  " M "  \33[90m at %s (%s:%d) \33[39m\n", ##__VA_ARGS__, __func__, __FILENAME__, __LINE__)
+#endif /* NOCOLORS */
+
+#if LOG_LEVEL > LOG_LEVEL_INFO
+#undef log_info
+#define log_info(M, ...)
+#endif
+
+#if LOG_LEVEL > LOG_LEVEL_WARN
+#undef log_warn
+#define log_warn(M, ...)
+#endif
+
+#if LOG_LEVEL > LOG_LEVEL_ERROR
+#undef log_error
+#define log_error(M, ...)
+#endif
+
+#endif
\ No newline at end of file