add mrbgems/ext/mruby-numeric, and method: Integer#chr

1 files changed, 30 insertions, 0 deletions

diff --git a/mrbgems/mruby-numeric-ext/src/numeric_ext.c b/mrbgems/mruby-numeric-ext/src/numeric_ext.c
new file mode 100644
index 000000000..b2c0e7986
--- /dev/null
+++ b/mrbgems/mruby-numeric-ext/src/numeric_ext.c
@@ -0,0 +1,30 @@
+#include "mruby.h"
+#include "mruby/numeric.h"
+
+static mrb_value
+mrb_int_chr(mrb_state *mrb, mrb_value x)
+{
+  mrb_int chr;
+  char c;
+
+  chr = mrb_fixnum(x);
+  if (chr >= (1 << CHAR_BIT)) {
+    mrb_raisef(mrb, E_RANGE_ERROR, "%ld out of char range", chr);
+  }
+  c = (char)chr;
+
+  return mrb_str_new(mrb, &c, 1);
+}
+
+void
+mrb_mruby_numeric_ext_gem_init(mrb_state* mrb)
+{
+  struct RClass *i = mrb_class_get(mrb, "Integer");
+
+  mrb_define_method(mrb, i, "chr",    mrb_int_chr,            ARGS_NONE());
+}
+
+void
+mrb_mruby_numeric_ext_gem_final(mrb_state* mrb)
+{
+}