Revert half of 9fbf0ef8.

I misunderstand the meaning of #4483. Sorry.

3 files changed, 14 insertions, 6 deletions

diff --git a/include/mruby/array.h b/include/mruby/array.h
index 61e3ab8d5..5164efa69 100644
--- a/include/mruby/array.h
+++ b/include/mruby/array.h
@@ -17,7 +17,7 @@ MRB_BEGIN_DECL
 
 typedef struct mrb_shared_array {
   int refcnt;
-  mrb_int len;
+  mrb_ssize len;
   mrb_value *ptr;
 } mrb_shared_array;
 
@@ -33,9 +33,9 @@ struct RArray {
   MRB_OBJECT_HEADER;
   union {
     struct {
-      mrb_int len;
+      mrb_ssize len;
       union {
-        mrb_int capa;
+        mrb_ssize capa;
         mrb_shared_array *shared;
       } aux;
       mrb_value *ptr;
diff --git a/include/mruby/string.h b/include/mruby/string.h
index a847a1804..8384128c7 100644
--- a/include/mruby/string.h
+++ b/include/mruby/string.h
@@ -23,9 +23,9 @@ struct RString {
   MRB_OBJECT_HEADER;
   union {
     struct {
-      mrb_int len;
+      mrb_ssize len;
       union {
-        mrb_int capa;
+        mrb_ssize capa;
         struct mrb_shared_string *shared;
         struct RString *fshared;
       } aux;
@@ -54,7 +54,7 @@ struct RStringEmbed {
     RSTR_SET_EMBED_LEN((s),(n));\
   }\
   else {\
-    (s)->as.heap.len = (mrb_int)(n);\
+    (s)->as.heap.len = (mrb_ssize)(n);\
   }\
 } while (0)
 #define RSTR_EMBED_PTR(s) (((struct RStringEmbed*)(s))->ary)
diff --git a/include/mruby/value.h b/include/mruby/value.h
index a0d299422..4c8befc44 100644
--- a/include/mruby/value.h
+++ b/include/mruby/value.h
@@ -168,6 +168,14 @@ struct RCptr {
 
 #define MRB_SYMBOL_BIT (sizeof(mrb_sym) * CHAR_BIT - MRB_SYMBOL_SHIFT)
 
+#if INTPTR_MAX < MRB_INT_MAX
+  typedef intptr_t mrb_ssize;
+# define MRB_SSIZE_MAX (INTPTR_MAX>>MRB_FIXNUM_SHIFT)
+#else
+  typedef mrb_int mrb_ssize;
+# define MRB_SSIZE_MAX MRB_INT_MAX
+#endif
+
 #ifndef mrb_immediate_p
 #define mrb_immediate_p(o) (mrb_type(o) < MRB_TT_FREE)
 #endif