memory_view.c: Use ssize_t for ndim in memory_view (#3615)

* memory_view.c: Use ssize_t for ndim in memory_view

* include/ruby/memory_view.h: Fix the type of item_size argument

ext/-test-/memory_view/memory_view.c

@@ -185,7 +185,7 @@ memory_view_get_memory_view_info(VALUE mod, VALUE obj)
 static VALUE
 memory_view_fill_contiguous_strides(VALUE mod, VALUE ndim_v, VALUE item_size_v, VALUE shape_v, VALUE row_major_p)
 {
-    int i, ndim = FIX2INT(ndim_v);
+    ssize_t i, ndim = NUM2SSIZET(ndim_v);
 
     Check_Type(shape_v, T_ARRAY);
     ssize_t *shape = ALLOC_N(ssize_t, ndim);

include/ruby/memory_view.h

@@ -85,7 +85,7 @@ typedef struct {
     } item_desc;
 
     /* The number of dimension. */
-    int ndim;
+    ssize_t ndim;
 
     /* ndim size array indicating the number of elements in each dimension.
      * This can be NULL when ndim == 1. */
@@ -124,7 +124,7 @@ bool rb_memory_view_register(VALUE klass, const rb_memory_view_entry_t *entry);
 
 int rb_memory_view_is_row_major_contiguous(const rb_memory_view_t *view);
 int rb_memory_view_is_column_major_contiguous(const rb_memory_view_t *view);
-void rb_memory_view_fill_contiguous_strides(const int ndim, const int item_size, const ssize_t *const shape, const int row_major_p, ssize_t *const strides);
+void rb_memory_view_fill_contiguous_strides(const ssize_t ndim, const ssize_t item_size, const ssize_t *const shape, const int row_major_p, ssize_t *const strides);
 int rb_memory_view_init_as_byte_array(rb_memory_view_t *view, VALUE obj, void *data, const ssize_t len, const int readonly);
 ssize_t rb_memory_view_parse_item_format(const char *format,
                                          rb_memory_view_item_component_t **members,

memory_view.c

@@ -78,7 +78,7 @@ rb_memory_view_is_column_major_contiguous(const rb_memory_view_t *view)
 
 /* Initialize strides array to represent the specified contiguous array. */
 void
-rb_memory_view_fill_contiguous_strides(const int ndim, const int item_size, const ssize_t *const shape, const int row_major_p, ssize_t *const strides)
+rb_memory_view_fill_contiguous_strides(const ssize_t ndim, const ssize_t item_size, const ssize_t *const shape, const int row_major_p, ssize_t *const strides)
 {
     ssize_t i, n = item_size;
     if (row_major_p) {
@@ -414,7 +414,7 @@ rb_memory_view_get_item_pointer(rb_memory_view_t *view, const ssize_t *indices)
 
     assert(view->shape != NULL);
 
-    int i;
+    ssize_t i;
     if (view->strides == NULL) {
         // row-major contiguous array
         ssize_t stride = view->item_size;