Issue #3101: Helper functions _add_one_to_C() and _add_one_to_F() become
_Py_add_one_to_C() and _Py_add_one_to_F(), respectively.
diff --git a/Objects/abstract.c b/Objects/abstract.c
index d5a5d3c..612271d 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -413,7 +413,7 @@
 
 
 void
-_add_one_to_index_F(int nd, Py_ssize_t *index, Py_ssize_t *shape)
+_Py_add_one_to_index_F(int nd, Py_ssize_t *index, const Py_ssize_t *shape)
 {
     int k;
 
@@ -429,7 +429,7 @@
 }
 
 void
-_add_one_to_index_C(int nd, Py_ssize_t *index, Py_ssize_t *shape)
+_Py_add_one_to_index_C(int nd, Py_ssize_t *index, const Py_ssize_t *shape)
 {
     int k;
 
@@ -453,7 +453,7 @@
 PyBuffer_ToContiguous(void *buf, Py_buffer *view, Py_ssize_t len, char fort)
 {
     int k;
-    void (*addone)(int, Py_ssize_t *, Py_ssize_t *);
+    void (*addone)(int, Py_ssize_t *, const Py_ssize_t *);
     Py_ssize_t *indices, elements;
     char *dest, *ptr;
 
@@ -480,10 +480,10 @@
     }
 
     if (fort == 'F') {
-        addone = _add_one_to_index_F;
+        addone = _Py_add_one_to_index_F;
     }
     else {
-        addone = _add_one_to_index_C;
+        addone = _Py_add_one_to_index_C;
     }
     dest = buf;
     /* XXX : This is not going to be the fastest code in the world
@@ -504,7 +504,7 @@
 PyBuffer_FromContiguous(Py_buffer *view, void *buf, Py_ssize_t len, char fort)
 {
     int k;
-    void (*addone)(int, Py_ssize_t *, Py_ssize_t *);
+    void (*addone)(int, Py_ssize_t *, const Py_ssize_t *);
     Py_ssize_t *indices, elements;
     char *src, *ptr;
 
@@ -531,10 +531,10 @@
     }
 
     if (fort == 'F') {
-        addone = _add_one_to_index_F;
+        addone = _Py_add_one_to_index_F;
     }
     else {
-        addone = _add_one_to_index_C;
+        addone = _Py_add_one_to_index_C;
     }
     src = buf;
     /* XXX : This is not going to be the fastest code in the world
@@ -611,7 +611,7 @@
         elements *= view_src.shape[k];
     }
     while (elements--) {
-        _add_one_to_index_C(view_src.ndim, indices, view_src.shape);
+        _Py_add_one_to_index_C(view_src.ndim, indices, view_src.shape);
         dptr = PyBuffer_GetPointer(&view_dest, indices);
         sptr = PyBuffer_GetPointer(&view_src, indices);
         memcpy(dptr, sptr, view_src.itemsize);