Fix fixed precision handling during rounding in long double

fmtlib · Aug 7, 2023 · d424862 · d424862
1 parent 3c1b333
commit d424862
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Showing 2 changed files with 3 additions and 1 deletion.
diff --git a/include/fmt/format.h b/include/fmt/format.h
@@ -3178,7 +3178,8 @@ FMT_CONSTEXPR20 inline void format_dragon(basic_fp<uint128_t> value,
       }
       if (buf[0] == overflow) {
         buf[0] = '1';
-        ++exp10;
+        if ((flags & dragon::fixed) != 0) buf.push_back('0');
+        else ++exp10;
       }
       return;
     }

diff --git a/test/format-test.cc b/test/format-test.cc
@@ -1472,6 +1472,7 @@ TEST(format_test, format_long_double) {
   EXPECT_EQ("0", fmt::format("{0:}", 0.0l));
   EXPECT_EQ("0.000000", fmt::format("{0:f}", 0.0l));
   EXPECT_EQ("0.0", fmt::format("{:.1f}", 0.000000001l));
+  EXPECT_EQ("0.10", fmt::format("{:.2f}", 0.099l));
   EXPECT_EQ("392.65", fmt::format("{0:}", 392.65l));
   EXPECT_EQ("392.65", fmt::format("{0:g}", 392.65l));
   EXPECT_EQ("392.65", fmt::format("{0:G}", 392.65l));