diff options
| -rw-r--r-- | sprintf.c | 4 | ||||
| -rw-r--r-- | test/ruby/test_sprintf.rb | 5 |
2 files changed, 7 insertions, 2 deletions
@@ -705,10 +705,10 @@ rb_str_format(int argc, const VALUE *argv, VALUE fmt) CHECK(n); rb_enc_mbcput(c, &buf[blen], enc); blen += n; - FILL(' ', width-1); + if (width > 1) FILL(' ', width-1); } else { - FILL(' ', width-1); + if (width > 1) FILL(' ', width-1); CHECK(n); rb_enc_mbcput(c, &buf[blen], enc); blen += n; diff --git a/test/ruby/test_sprintf.rb b/test/ruby/test_sprintf.rb index df9b19b064..595bf6d782 100644 --- a/test/ruby/test_sprintf.rb +++ b/test/ruby/test_sprintf.rb @@ -446,4 +446,9 @@ class TestSprintf < Test::Unit::TestCase h = { key: nil, key2: "key2_val" } assert_equal("key is , key2 is key2_val", "key is %{key}, key2 is %{key2}" % h) end + + def test_width_underflow + bug = 'https://github.com/mruby/mruby/issues/3347' + assert_equal("!", sprintf("%*c", 0, ?!.ord), bug) + end end |