diff --git a/testdata/operator/libc_unix.go b/testdata/operator/libc_unix.go
index 200d611..0380b32 100644
--- a/testdata/operator/libc_unix.go
+++ b/testdata/operator/libc_unix.go
@@ -18,6 +18,7 @@ type struct___sFILEX struct{}
 type struct__IO_marker struct{} // Linux
 type struct__IO_codecvt struct{}
 type struct__IO_wide_data struct{}
+type struct___locale_data struct{}
 
 func sliceOf(v unsafe.Pointer, bytes uint) []byte {
 	return (*[1 << 20]byte)(v)[:bytes]
diff --git a/testdata/printf/libc_unix.go b/testdata/printf/libc_unix.go
index ea9e7f4..a94cfe7 100644
--- a/testdata/printf/libc_unix.go
+++ b/testdata/printf/libc_unix.go
@@ -3,7 +3,7 @@
 
 package main
 
-func printf(format *int8, args ...interface{}) int32 {
+func vfprintf(fp *FILE, format *int8, args []interface{}) int32 {
 	return goprintf(format, args...)
 }
 
@@ -13,6 +13,11 @@ func __swbuf(_c int32, _p *FILE) int32 {
 
 type struct___sFILEX struct{}
 
-type struct__IO_marker struct{} // Linux
+type struct__IO_marker struct{}
 type struct__IO_codecvt struct{}
 type struct__IO_wide_data struct{}
+
+var (
+	stdout    *FILE
+	__stdoutp *FILE
+)
diff --git a/testdata/qsort/libc.go b/testdata/qsort/libc.go
index c25e3cb..a59fe6f 100644
--- a/testdata/qsort/libc.go
+++ b/testdata/qsort/libc.go
@@ -1,13 +1,17 @@
 package main
 
 import (
-	"fmt"
-	"strings"
+	"log"
 	"unsafe"
 
 	c "github.com/goplus/c2go/clang"
 )
 
+func a_cas(p *int32, t, s int32) int32 {
+	log.Panicln("a_cas: notimpl")
+	return 0
+}
+
 func C(s string) *int8 {
 	n := len(s)
 	ret := make([]byte, n+1)
@@ -24,17 +28,6 @@ func gostring(s *int8) string {
 	return string(arr[:n])
 }
 
-func goprintf(format *int8, args ...interface{}) int32 {
-	goformat := strings.ReplaceAll(gostring(format), "%lld", "%d")
-	for i, arg := range args {
-		if v, ok := arg.(*int8); ok {
-			args[i] = gostring(v)
-		}
-	}
-	fmt.Printf(goformat, args...)
-	return 0
-}
-
 func sliceOf(v unsafe.Pointer, bytes c.SizeT) []byte {
 	return (*[1 << 20]byte)(v)[:bytes]
 }
@@ -44,6 +37,21 @@ func memcpy(dst unsafe.Pointer, src unsafe.Pointer, n c.SizeT) unsafe.Pointer {
 	return dst
 }
 
-func a_cas(p *int32, t int32, s int32) int32 {
-	panic("notimpl")
+func __builtin___memcpy_chk(dst unsafe.Pointer, src unsafe.Pointer, n c.SizeT, elem c.SizeT) unsafe.Pointer {
+	copy(sliceOf(dst, n), sliceOf(src, n))
+	return dst
+}
+
+func __builtin_object_size(unsafe.Pointer, int32) c.SizeT {
+	return 1
+}
+
+func __builtin_bswap32(v uint32) uint32 {
+	log.Panicln("__builtin_bswap32: notimpl")
+	return v
+}
+
+func __builtin_bswap64(v uint64) uint64 {
+	log.Panicln("__builtin_bswap32: notimpl")
+	return v
 }
diff --git a/testdata/qsort/libc_unix.go b/testdata/qsort/libc_unix.go
index c2bbc18..e0afddb 100644
--- a/testdata/qsort/libc_unix.go
+++ b/testdata/qsort/libc_unix.go
@@ -3,42 +3,10 @@
 
 package main
 
-import (
-	"log"
-	"unsafe"
-
-	c "github.com/goplus/c2go/clang"
-)
-
-func printf(format *int8, args ...interface{}) int32 {
-	return goprintf(format, args...)
-}
-
-func __swbuf(_c int32, _p *FILE) int32 {
-	return _c
-}
-
 type struct___sFILEX struct{}
 
 type struct__IO_marker struct{} // Linux
 type struct__IO_codecvt struct{}
 type struct__IO_wide_data struct{}
 
-func __builtin___memcpy_chk(dst unsafe.Pointer, src unsafe.Pointer, n c.SizeT, elem c.SizeT) unsafe.Pointer {
-	copy(sliceOf(dst, n), sliceOf(src, n))
-	return dst
-}
-
-func __builtin_object_size(unsafe.Pointer, int32) c.SizeT {
-	return 1
-}
-
-func __builtin_bswap32(v uint32) uint32 {
-	log.Panicln("__builtin_bswap32: notimpl")
-	return v
-}
-
-func __builtin_bswap64(v uint64) uint64 {
-	log.Panicln("__builtin_bswap32: notimpl")
-	return v
-}
+type struct___locale_data struct{}