feat(fatfs): add FATFS from esp-idf

Commit ID: 3b16089c

components/fatfs/port/linux/ffsystem.c

@@ -0,0 +1,46 @@
+/*------------------------------------------------------------------------*/
+/* OS Dependent Functions for FatFs                                       */
+/* (C)ChaN, 2018                                                          */
+/*------------------------------------------------------------------------*/
+
+
+#include "ff.h"
+#include <stdlib.h>
+
+/* This is the implementation for host-side testing on Linux.
+ * Host-side tests are single threaded, so lock functionality isn't needed.
+ */
+
+void* ff_memalloc(UINT msize)
+{
+    return malloc(msize);
+}
+
+void ff_memfree(void* mblock)
+{
+    free(mblock);
+}
+
+/* 1:Function succeeded, 0:Could not create the sync object */
+int ff_cre_syncobj(BYTE vol, FF_SYNC_t* sobj)
+{
+    *sobj = NULL;
+    return 1;
+}
+
+/* 1:Function succeeded, 0:Could not delete due to an error */
+int ff_del_syncobj(FF_SYNC_t sobj)
+{
+    return 1;
+}
+
+/* 1:Function succeeded, 0:Could not acquire lock */
+int ff_req_grant (FF_SYNC_t sobj)
+{
+    return 1;
+}
+
+void ff_rel_grant (FF_SYNC_t sobj)
+{
+}
+