Implement new logging system.

src/loader/utils/logging.c

@@ -0,0 +1,96 @@
+#include <loader/utils/logging.h>
+
+/**
+ * Prints a log message to stdout/stderr along with a file if specified.
+ * 
+ * @param req_lvl The required level for this message.
+ * @param cur_lvl The current verbose level.
+ * @param error If 1, sets pipe to stderr instead of stdout.
+ * @param msg The log message.
+ * @param args A VA list of arguments for the message.
+ * 
+ * @return void
+ */
+static void LogMsgRaw(int req_lvl, int cur_lvl, int error, const char* log_path, const char* msg, va_list args)
+{
+    if (cur_lvl < req_lvl)
+    {
+        return;
+    }
+
+    FILE* pipe = stdout;
+
+    if (error)
+    {
+        pipe = stderr;
+    }
+
+    // We need to format the message.
+    va_list args_copy;
+    va_copy(args_copy, args);
+    int len = vsnprintf(NULL, 0, msg, args_copy);
+    va_end(args_copy);
+
+    if (len < 0)
+    {
+        return;
+    }
+
+    char f_msg[len + 1];
+    vsnprintf(f_msg, sizeof(f_msg), msg, args);
+
+    char full_msg[len + 6 + 1];
+    snprintf(full_msg, sizeof(full_msg), "[%d] %s", req_lvl, f_msg);
+
+    fprintf(pipe, "%s\n", full_msg);
+
+    if (log_path != NULL)
+    {
+        FILE* log_file = fopen(log_path, "a");
+
+        if (!log_file)
+        {
+            return;
+        }
+
+        time_t now = time(NULL);
+        struct tm* tm_val = localtime(&now);
+
+        if (!tm_val)
+        {
+            fclose(log_file);
+
+            return;
+        }
+
+
+        char log_file_msg[len + 22 + 1];
+
+        snprintf(log_file_msg, sizeof(log_file_msg), "[%02d-%02d-%02d %02d:%02d:%02d]%s", tm_val->tm_year % 100, tm_val->tm_mon + 1, tm_val->tm_mday,
+        tm_val->tm_hour, tm_val->tm_min, tm_val->tm_sec, full_msg);
+
+        fprintf(log_file, "%s\n", log_file_msg);
+
+        fclose(log_file);
+    }
+}
+
+/**
+ * Prints a log message using LogMsgRaw().
+ * 
+ * @param cfg A pointer to the config structure.
+ * @param req_lvl The required level for this message.
+ * @param error Whether this is an error.
+ * @param msg The log message with format support.
+ * 
+ * @return void
+ */
+void LogMsg(config__t* cfg, int req_lvl, int error, const char* msg, ...)
+{
+    va_list args;
+    va_start(args, msg);
+
+    LogMsgRaw(req_lvl, cfg->verbose, error, (const char*)cfg->log_file, msg, args);
+
+    va_end(args);
+}