https://git.ruby-lang.org/ruby.git/commit/?id=af10771045

From af107710457b4bd148c6e5ee7a336ed4961f5423 Mon Sep 17 00:00:00 2001
From: "S.H" <gamelinks007@g...>
Date: Wed, 2 Feb 2022 22:52:55 +0900
Subject: Add `econv_get_encoding` function

---
 transcode.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/transcode.c b/transcode.c
index d7011443f8..9cc4d00f28 100644
--- a/transcode.c
+++ b/transcode.c
@@ -3499,6 +3499,14 @@ check_econv(VALUE self) https://github.com/ruby/ruby/blob/trunk/transcode.c#L3499
     return ec;
 }
 
+static VALUE
+econv_get_encoding(rb_encoding *encoding)
+{
+    if (!encoding)
+        return Qnil;
+    return rb_enc_from_encoding(encoding);
+}
+
 /*
  * call-seq:
  *   ec.source_encoding -> encoding
@@ -3509,9 +3517,7 @@ static VALUE https://github.com/ruby/ruby/blob/trunk/transcode.c#L3517
 econv_source_encoding(VALUE self)
 {
     rb_econv_t *ec = check_econv(self);
-    if (!ec->source_encoding)
-        return Qnil;
-    return rb_enc_from_encoding(ec->source_encoding);
+    return econv_get_encoding(ec->source_encoding);
 }
 
 /*
@@ -3524,9 +3530,7 @@ static VALUE https://github.com/ruby/ruby/blob/trunk/transcode.c#L3530
 econv_destination_encoding(VALUE self)
 {
     rb_econv_t *ec = check_econv(self);
-    if (!ec->destination_encoding)
-        return Qnil;
-    return rb_enc_from_encoding(ec->destination_encoding);
+    return econv_get_encoding(ec->destination_encoding);
 }
 
 /*
-- 
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