Revisions, SVI import fix.

source/logging/logger.cpp

@@ -0,0 +1,52 @@
+#include "logging/logger.hpp"
+
+#include "config/config.hpp"
+#include "fslib.hpp"
+
+#include <array>
+#include <cstdarg>
+#include <fstream>
+#include <mutex>
+#include <switch.h>
+
+namespace
+{
+    constexpr const char *PATH_JKSV_LOG = "sdmc:/config/JKSV/JKSV.log";
+
+    /// @brief This is the buffer size for log strings.
+    constexpr size_t VA_BUFFER_SIZE = 0x1000;
+
+    constexpr int64_t SIZE_LOG_LIMIT = 0x10000;
+} // namespace
+
+void logger::initialize()
+{
+    // Can't really log errors for the log before it exists?
+    const fslib::Path logPath{PATH_JKSV_LOG};
+    const bool exists = fslib::file_exists(logPath);
+    if (!exists) { fslib::create_file(logPath); }
+}
+
+void logger::log(const char *format, ...)
+{
+    static std::mutex logLock{};
+
+    std::array<char, VA_BUFFER_SIZE> vaBuffer = {};
+    std::va_list vaList{};
+    va_start(vaList, format);
+    vsnprintf(vaBuffer.data(), VA_BUFFER_SIZE, format, vaList);
+    va_end(vaList);
+
+    std::lock_guard<std::mutex> logGuard(logLock);
+    const fslib::Path logPath{PATH_JKSV_LOG};
+    fslib::File logFile(logPath, FsOpenMode_Append);
+    if (logFile.is_open() && logFile.get_size() >= SIZE_LOG_LIMIT)
+    {
+        logFile.close();
+        logFile.open(logPath, FsOpenMode_Create | FsOpenMode_Write);
+    }
+
+    if (!logFile.is_open()) { return; }
+    logFile << vaBuffer.data() << "\n";
+    logFile.flush();
+}