1 files changed, 79 insertions, 0 deletions
diff --git a/src/tbm_emulator_log.c b/src/tbm_emulator_log.c
new file mode 100644
index 0000000..54442b5
--- /dev/null
+++ b/src/tbm_emulator_log.c
@@ -0,0 +1,79 @@
+#include "tbm_emulator_log.h"
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <sys/time.h>
+
+static const char *g_log_level_to_str[] =
+{
+    "OFF",
+    "ERROR",
+    "INFO",
+    "DEBUG"
+};
+
+static pthread_once_t g_log_init = PTHREAD_ONCE_INIT;
+static int g_debug_enabled = 0;
+
+static void tbm_emulator_log_init_once(void)
+{
+    char *debug_enabled_str = getenv("TBM_EMULATOR_DEBUG");
+    g_debug_enabled = debug_enabled_str ? atoi(debug_enabled_str) : 0;
+}
+
+static void tbm_emulator_log_init(void)
+{
+    pthread_once(&g_log_init, tbm_emulator_log_init_once);
+}
+
+static void tbm_emulator_log_print_current_time(void)
+{
+    char buff[128];
+    struct tm tm;
+    struct timeval tv = { 0, 0 };
+    time_t ti;
+
+    gettimeofday(&tv, NULL);
+
+    ti = tv.tv_sec;
+
+    localtime_r(&ti, &tm);
+    strftime(buff, sizeof(buff),
+             "%H:%M:%S", &tm);
+    fprintf(stderr, "%s", buff);
+}
+
+void tbm_emulator_log_event(tbm_emulator_log_level log_level,
+                            const char *func,
+                            int line,
+                            const char *format, ...)
+{
+    va_list args;
+
+    tbm_emulator_log_init();
+
+    tbm_emulator_log_print_current_time();
+    fprintf(stderr,
+            " %-5s [%u] %s:%d",
+            g_log_level_to_str[log_level],
+            getpid(),
+            func,
+            line);
+    if (format) {
+        va_start(args, format);
+        fprintf(stderr, " - ");
+        vfprintf(stderr, format, args);
+        va_end(args);
+    }
+    fprintf(stderr, "\n");
+}
+
+int tbm_emulator_log_is_debug_enabled()
+{
+    tbm_emulator_log_init();
+
+    return g_debug_enabled;
+}