Fix initialization of iterator_buffer (#1996)

2 files changed, 8 insertions, 1 deletions

diff --git a/include/fmt/core.h b/include/fmt/core.h
index 262a94f9..5135f1f9 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -784,7 +784,7 @@ class iterator_buffer final : public Traits, public buffer<T> {
  public:
   explicit iterator_buffer(OutputIt out, size_t n = buffer_size)
       : Traits(n),
-        buffer<T>(data_, 0, n < size_t(buffer_size) ? n : size_t(buffer_size)),
+        buffer<T>(data_, 0, buffer_size),
         out_(out) {}
   ~iterator_buffer() { flush(); }
 
diff --git a/test/format-test.cc b/test/format-test.cc
index 0f87a23c..5626fa28 100644
--- a/test/format-test.cc
+++ b/test/format-test.cc
@@ -1945,10 +1945,12 @@ TEST(FormatTest, FormatToN) {
   EXPECT_EQ(5u, result.size);
   EXPECT_EQ(buffer + 3, result.out);
   EXPECT_EQ("123x", fmt::string_view(buffer, 4));
+
   result = fmt::format_to_n(buffer, 3, "{:s}", "foobar");
   EXPECT_EQ(6u, result.size);
   EXPECT_EQ(buffer + 3, result.out);
   EXPECT_EQ("foox", fmt::string_view(buffer, 4));
+
   buffer[0] = 'x';
   buffer[1] = 'x';
   buffer[2] = 'x';
@@ -1956,10 +1958,15 @@ TEST(FormatTest, FormatToN) {
   EXPECT_EQ(1u, result.size);
   EXPECT_EQ(buffer + 1, result.out);
   EXPECT_EQ("Axxx", fmt::string_view(buffer, 4));
+
   result = fmt::format_to_n(buffer, 3, "{}{} ", 'B', 'C');
   EXPECT_EQ(3u, result.size);
   EXPECT_EQ(buffer + 3, result.out);
   EXPECT_EQ("BC x", fmt::string_view(buffer, 4));
+
+  result = fmt::format_to_n(buffer, 4, "{}", "ABCDE");
+  EXPECT_EQ(5u, result.size);
+  EXPECT_EQ("ABCD", fmt::string_view(buffer, 4));
 }
 
 TEST(FormatTest, WideFormatToN) {