Split project over multiple files

src/file_system.h

@@ -0,0 +1,25 @@
+#ifndef FILE_SYSTEM_INCLUDED
+#define FILE_SYSTEM_INCLUDED
+
+#include "basic.h"
+
+typedef struct {
+    uint64_t data;
+} Handle;
+
+int file_open(string path, Handle *fd);
+void file_close(Handle fd);
+int file_lock(Handle fd);
+int file_unlock(Handle fd);
+int file_sync(Handle fd);
+int file_read(Handle fd, char *dst, int max);
+int file_write(Handle fd, char *src, int len);
+int file_size(Handle fd, size_t *len);
+int file_write_atomic(string path, string content);
+int create_dir(string path);
+int rename_file_or_dir(string oldpath, string newpath);
+int remove_file_or_dir(string path);
+int get_full_path(string path, char *dst);
+int file_read_all(string path, string *data);
+
+#endif // FILE_SYSTEM_INCLUDED