Merge pull request #3363 from ksss/string

Do nothing when empty string

Merge pull request #3363 from ksss/string
Do nothing when empty string
ede04d68 · Yukihiro "Matz" Matsumoto · GitHub · 5e3077c0 · 0de65a88 · ede04d68
Commit ede04d68 authored Dec 25, 2016 by Yukihiro "Matz" Matsumoto Committed by GitHub Dec 25, 2016
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src/string.c src/string.c +3 -0

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--- a/src/string.c
+++ b/src/string.c
@@ -754,6 +754,9 @@ mrb_str_concat(mrb_state *mrb, mrb_value self, mrb_value other)
    other = mrb_str_to_str(mrb, other);
  }
  s2 = mrb_str_ptr(other);
+  if (RSTR_LEN(s2) == 0) {
+    return;
+  }
  len = RSTR_LEN(s1) + RSTR_LEN(s2);

  if (RSTRING_CAPA(self) < len) {