https://git.ruby-lang.org/ruby.git/commit/?id=591ee9d068

From 591ee9d068de174460f0e6fe81b36e7625b90f6c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 7 Aug 2022 13:09:46 +0900
Subject: [DOC] Add return values of rb_enc_mbcput

---
 include/ruby/internal/encoding/encoding.h | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/include/ruby/internal/encoding/encoding.h b/include/ruby/internal/encoding/encoding.h
index 22deb8f8c9..4748ca806b 100644
--- a/include/ruby/internal/encoding/encoding.h
+++ b/include/ruby/internal/encoding/encoding.h
@@ -643,10 +643,12 @@ rb_enc_code_to_mbclen(int c, rb_encoding *enc) https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/encoding/encoding.h#L643
  * Identical to rb_enc_uint_chr(),  except it writes back to  the passed buffer
  * instead of allocating one.
  *
- * @param[in]   c    Code point.
- * @param[out]  buf  Return buffer.
- * @param[in]   enc  Target encoding scheme.
- * @post        `c` is encoded according to `enc`, then written to `buf`.
+ * @param[in]  c          Code point.
+ * @param[out] buf        Return buffer.
+ * @param[in]  enc        Target encoding scheme.
+ * @retval     <= 0       `c` is invalid in `enc`.
+ * @return     otherwise  Number of bytes written to `buf`.
+ * @post       `c` is encoded according to `enc`, then written to `buf`.
  *
  * @internal
  *
-- 
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