A function detecting when a file is hosted on a FAT system

src/ProjectFileIO.cpp

@@ -2206,6 +2206,50 @@ bool ProjectFileIO::IsRecovered() const
    return mRecovered;
 }
 
+// How to detect whether the file system of a path is FAT
+// No apparent way to do it with wxWidgets
+#if defined(__DARWIN__)
+#include <sys/mount.h>
+static bool IsOnFATFileSystem(const FilePath &path)
+{
+   struct statfs fs;
+   if (statfs(path.c_str(), &fs))
+      // Error from statfs
+      return false;
+   return 0 == strcmp(fs.f_fstypename, "msdos");
+}
+#elif defined(__linux__)
+#include <sys/statfs.h>
+#include "/usr/include/linux/magic.h"
+static bool IsOnFATFileSystem(const FilePath &path)
+{
+   struct statfs fs;
+   if (statfs(path.c_str(), &fs))
+      // Error from statfs
+      return false;
+   return fs.f_type == MSDOS_SUPER_MAGIC;
+}
+#elif defined(_WIN32)
+#include <fileapi.h>
+static bool IsOnFATFileSystem(const FilePath &path)
+{
+   DWORD volumeFlags;
+   wxChar volumeType[64];
+   if (!::GetVolumeInformation(
+      path.c_str(), NULL, 0, NULL, NULL,
+      &volumeFlags,
+      volumeType,
+      WXSIZEOF(volumeType)))
+      return false;
+   return wxString(volumeType).Upper().find(wxT("FAT")) != wxString::npos;
+}
+#else
+static bool IsOnFATFileSystem(const FilePath &path)
+{
+   return false;
+}
+#endif
+
 wxLongLong ProjectFileIO::GetFreeDiskSpace() const
 {
    wxLongLong freeSpace;