1 files changed, 24 insertions, 0 deletions
diff --git a/src/numeric.c b/src/numeric.c
index 24160fb77..fe9995bd4 100644
--- a/src/numeric.c
+++ b/src/numeric.c
@@ -277,6 +277,30 @@ flo_div(mrb_state *mrb, mrb_value x)
   return mrb_float_value(mrb, a);
 }
 
+MRB_API mrb_value
+mrb_float_to_str(mrb_state *mrb, mrb_value flo)
+{
+  char buf[25];
+#ifdef MRB_USE_FLOAT32
+  const int prec =  7;
+#else
+  const int prec =  15;
+#endif
+
+  mrb_format_float(mrb_float(flo), buf, sizeof(buf), 'g', prec, '\0');
+  for (char *p = buf; *p; p++) {
+    if (*p == '.') goto exit;
+    if (*p == 'e') {
+      memmove(p+2, p, strlen(p)+1);
+      memcpy(p, ".0", 2);
+      goto exit;
+    }
+  }
+  strcat(buf, ".0");
+ exit:
+  return mrb_str_new_cstr(mrb, buf);
+}
+
 /* 15.2.9.3.16(x) */
 /*
  *  call-seq: