use color output for logging to stdout

plugins/ua_log_stdout.c

@@ -7,12 +7,27 @@
 #include "ua_types_generated.h"
 #include "ua_types_generated_handling.h"
 
+/* ANSI escape sequences for color output taken from here:
+ * https://stackoverflow.com/questions/3219393/stdlib-and-colored-output-in-c*/
+
+#define ANSI_COLOR_RED     "\x1b[31m"
+#define ANSI_COLOR_GREEN   "\x1b[32m"
+#define ANSI_COLOR_YELLOW  "\x1b[33m"
+#define ANSI_COLOR_BLUE    "\x1b[34m"
+#define ANSI_COLOR_MAGENTA "\x1b[35m"
+#define ANSI_COLOR_CYAN    "\x1b[36m"
+#define ANSI_COLOR_RESET   "\x1b[0m"
+
 #ifdef UA_ENABLE_MULTITHREADING
 #include <pthread.h>
 static pthread_mutex_t printf_mutex = PTHREAD_MUTEX_INITIALIZER;
 #endif
 
-const char *logLevelNames[6] = {"trace", "debug", "info", "warn", "error", "fatal"};
+const char *logLevelNames[6] = {"trace", "debug",
+                                ANSI_COLOR_GREEN "info",
+                                ANSI_COLOR_YELLOW "warn",
+                                ANSI_COLOR_RED "error",
+                                ANSI_COLOR_MAGENTA "fatal"};
 const char *logCategoryNames[7] = {"network", "channel", "session", "server",
                                    "client", "userland", "securitypolicy"};
 
@@ -26,7 +41,7 @@ UA_Log_Stdout(UA_LogLevel level, UA_LogCategory category,
 #ifdef UA_ENABLE_MULTITHREADING
     pthread_mutex_lock(&printf_mutex);
 #endif
-    printf("[%.23s] %s/%s\t", t.data, logLevelNames[level], logCategoryNames[category]);
+    printf("[%.23s] %s/%s" ANSI_COLOR_RESET "\t", t.data, logLevelNames[level], logCategoryNames[category]);
     vprintf(msg, args);
     printf("\n");
     fflush(stdout);