move out c/cpp/py

cl/_testrt/qsort/in.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"unsafe"
+
+	"github.com/goplus/lib/c"
+)
+
+//go:linkname qsort C.qsort
+func qsort(base c.Pointer, count, elem uintptr, compar func(a, b c.Pointer) c.Int)
+
+func main() {
+	a := [...]int{100, 8, 23, 2, 7}
+	qsort(c.Pointer(&a[0]), 5, unsafe.Sizeof(0), func(a, b c.Pointer) c.Int {
+		return c.Int(*(*int)(a) - *(*int)(b))
+	})
+	for _, v := range a {
+		c.Printf(c.Str("%d\n"), v)
+	}
+}