Add a "fork" of musl as //fusl.

fusl/src/stdio/ext2.c

Index: fusl/src/stdio/ext2.c
diff --git a/fusl/src/stdio/ext2.c b/fusl/src/stdio/ext2.c
new file mode 100644
index 0000000000000000000000000000000000000000..f359be9af7622dbcadc42b2372839136970732a9
--- /dev/null
+++ b/fusl/src/stdio/ext2.c
@@ -0,0 +1,24 @@
+#include "stdio_impl.h"
+
+size_t __freadahead(FILE *f)
+{
+	return f->rend - f->rpos;
+}
+
+const char *__freadptr(FILE *f, size_t *sizep)
+{
+	size_t size = f->rend - f->rpos;
+	if (!size) return 0;
+	*sizep = size;
+	return (const char *)f->rpos;
+}
+
+void __freadptrinc(FILE *f, size_t inc)
+{
+	f->rpos += inc;
+}
+
+void __fseterr(FILE *f)
+{
+	f->flags |= F_ERR;
+}