mruby-io/file.c: add File#atime and File#ctime

mrbgems/mruby-io/README.md

@@ -158,10 +158,10 @@ Add the line below to your build configuration.
 | File.writable?              |          | FileTest |
 | File.writable_real?         |          | FileTest |
 | File.zero?                  | o        | FileTest |
-| File#atime                  |          |          |
+| File#atime                  | o        |          |
 | File#chmod                  |          |          |
 | File#chown                  |          |          |
-| File#ctime                  |          |          |
+| File#ctime                  | o        |          |
 | File#flock                  | o        |          |
 | File#lstat                  |          |          |
 | File#mtime                  | o        |          |

mrbgems/mruby-io/mrblib/file.rb

@@ -11,6 +11,16 @@ class File < IO
     end
   end
 
+  def atime
+    t = self._atime
+    t && Time.at(t)
+  end
+
+  def ctime
+    t = self._ctime
+    t && Time.at(t)
+  end
+
   def mtime
     t = self._mtime
     t && Time.at(t)

mrbgems/mruby-io/src/file.c

@@ -391,6 +391,28 @@ mrb_file__gethome(mrb_state *mrb, mrb_value klass)
 #endif
 }
 
+static mrb_value
+mrb_file_atime(mrb_state *mrb, mrb_value self)
+{
+  int fd = mrb_io_fileno(mrb, self);
+  mrb_stat st;
+
+  if (mrb_fstat(fd, &st) == -1)
+    return mrb_nil_value();
+  return mrb_int_value(mrb, (mrb_int)st.st_atime);
+}
+
+static mrb_value
+mrb_file_ctime(mrb_state *mrb, mrb_value self)
+{
+  int fd = mrb_io_fileno(mrb, self);
+  mrb_stat st;
+
+  if (mrb_fstat(fd, &st) == -1)
+    return mrb_nil_value();
+  return mrb_int_value(mrb, (mrb_int)st.st_ctime);
+}
+
 static mrb_value
 mrb_file_mtime(mrb_state *mrb, mrb_value self)
 {
@@ -610,6 +632,8 @@ mrb_init_file(mrb_state *mrb)
   mrb_define_class_method(mrb, file, "_gethome",  mrb_file__gethome,   MRB_ARGS_OPT(1));
 
   mrb_define_method(mrb, file, "flock", mrb_file_flock, MRB_ARGS_REQ(1));
+  mrb_define_method(mrb, file, "_atime", mrb_file_atime, MRB_ARGS_NONE());
+  mrb_define_method(mrb, file, "_ctime", mrb_file_ctime, MRB_ARGS_NONE());
   mrb_define_method(mrb, file, "_mtime", mrb_file_mtime, MRB_ARGS_NONE());
   mrb_define_method(mrb, file, "size", mrb_file_size, MRB_ARGS_NONE());
   mrb_define_method(mrb, file, "truncate", mrb_file_truncate, MRB_ARGS_REQ(1));