From 7f59e105d1dfb85cd6d0fb1d163b904b3d444f6f Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 21 Dec 2007 23:29:56 +0000
Subject: * string.c (rb_str_buf_append): improvement for non-broken coded  
 strings.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14447 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 string.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'string.c')

diff --git a/string.c b/string.c
index f6cbc86f22..03a45a58de 100644
--- a/string.c
+++ b/string.c
@@ -1009,8 +1009,17 @@ rb_str_buf_append(VALUE str, VALUE str2)
 {
     rb_encoding *enc;
     long capa, len;
+    int cr1, cr2;
 
     enc = rb_enc_check(str, str2);
+    cr1 = ENC_CODERANGE(str);
+    cr2 = ENC_CODERANGE(str2);
+    if (cr1 == ENC_CODERANGE_BROKEN || cr2 == ENC_CODERANGE_BROKEN) {
+	cr1 = ENC_CODERANGE_UNKNOWN;
+    }
+    else if (cr2 > cr1) {
+	cr1 = cr2;
+    }
     rb_str_modify(str);
     if (STR_ASSOC_P(str)) {
 	FL_UNSET(str, STR_ASSOC);
@@ -1034,6 +1043,9 @@ rb_str_buf_append(VALUE str, VALUE str2)
     STR_SET_LEN(str, len);
     OBJ_INFECT(str, str2);
     rb_enc_associate(str, enc);
+    if (cr1 != ENC_CODERANGE_UNKNOWN) {
+	ENC_CODERANGE_SET(str, cr1);
+    }
 
     return str;
 }
-- 
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