... and for better readabilities.


Signed-off-by: Zheng Li <dev@xxxxxxxx>

diff --git a/tools/ocaml/libs/mmap/mmap_stubs.c b/tools/ocaml/libs/mmap/mmap_stubs.c
--- a/tools/ocaml/libs/mmap/mmap_stubs.c
+++ b/tools/ocaml/libs/mmap/mmap_stubs.c
@@ -28,7 +28,7 @@
 #include <caml/fail.h>
 #include <caml/callback.h>
 
-#define GET_C_STRUCT(a) ((struct mmap_interface *) a)
+#define Intf_val(a) ((struct mmap_interface *) a)
 
 static int mmap_interface_init(struct mmap_interface *intf,
                                int fd, int pflag, int mflag,
@@ -61,27 +61,27 @@ CAMLprim value stub_mmap_init(value fd, 
 
 	result = caml_alloc(sizeof(struct mmap_interface), Abstract_tag);
 
-	if (mmap_interface_init(GET_C_STRUCT(result), Int_val(fd),
+	if (mmap_interface_init(Intf_val(result), Int_val(fd),
 	                        c_pflag, c_mflag,
 	                        Int_val(len), Int_val(offset)))
 		caml_failwith("mmap");
 	CAMLreturn(result);
 }
 
-CAMLprim value stub_mmap_final(value interface)
+CAMLprim value stub_mmap_final(value intf)
 {
-	CAMLparam1(interface);
+	CAMLparam1(intf);
 
-	if (GET_C_STRUCT(interface)->addr != MAP_FAILED)
-		munmap(GET_C_STRUCT(interface)->addr, GET_C_STRUCT(interface)->len);
-	GET_C_STRUCT(interface)->addr = MAP_FAILED;
+	if (Intf_val(intf)->addr != MAP_FAILED)
+		munmap(Intf_val(intf)->addr, Intf_val(intf)->len);
+	Intf_val(intf)->addr = MAP_FAILED;
 
 	CAMLreturn(Val_unit);
 }
 
-CAMLprim value stub_mmap_read(value interface, value start, value len)
+CAMLprim value stub_mmap_read(value intf, value start, value len)
 {
-	CAMLparam3(interface, start, len);
+	CAMLparam3(intf, start, len);
 	CAMLlocal1(data);
 	int c_start;
 	int c_len;
@@ -89,33 +89,33 @@ CAMLprim value stub_mmap_read(value inte
 	c_start = Int_val(start);
 	c_len = Int_val(len);
 
-	if (c_start > GET_C_STRUCT(interface)->len)
+	if (c_start > Intf_val(intf)->len)
 		caml_invalid_argument("start invalid");
-	if (c_start + c_len > GET_C_STRUCT(interface)->len)
+	if (c_start + c_len > Intf_val(intf)->len)
 		caml_invalid_argument("len invalid");
 
 	data = caml_alloc_string(c_len);
-	memcpy((char *) data, GET_C_STRUCT(interface)->addr + c_start, c_len);
+	memcpy((char *) data, Intf_val(intf)->addr + c_start, c_len);
 
 	CAMLreturn(data);
 }
 
-CAMLprim value stub_mmap_write(value interface, value data,
+CAMLprim value stub_mmap_write(value intf, value data,
                                value start, value len)
 {
-	CAMLparam4(interface, data, start, len);
+	CAMLparam4(intf, data, start, len);
 	int c_start;
 	int c_len;
 
 	c_start = Int_val(start);
 	c_len = Int_val(len);
 
-	if (c_start > GET_C_STRUCT(interface)->len)
+	if (c_start > Intf_val(intf)->len)
 		caml_invalid_argument("start invalid");
-	if (c_start + c_len > GET_C_STRUCT(interface)->len)
+	if (c_start + c_len > Intf_val(intf)->len)
 		caml_invalid_argument("len invalid");
 
-	memcpy(GET_C_STRUCT(interface)->addr + c_start, (char *) data, c_len);
+	memcpy(Intf_val(intf)->addr + c_start, (char *) data, c_len);
 
 	CAMLreturn(Val_unit);
 }