From c09bcd351af03eaadd44552f47a0fc85bf64075a Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 11 Feb 2010 11:45:22 +0000
Subject: * io.c (rb_io_oflags_modestr): return "r" for O_RDONLY|O_APPEND.  
 [ruby-dev:40379]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26644 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 io.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'io.c')

diff --git a/io.c b/io.c
index da3fc7bb7b..d92e104da7 100644
--- a/io.c
+++ b/io.c
@@ -4111,11 +4111,14 @@ rb_io_oflags_modestr(int oflags)
 #else
 # define MODE_BINARY(a,b) (a)
 #endif
+    int accmode = oflags & (O_RDONLY|O_WRONLY|O_RDWR);
     if (oflags & O_APPEND) {
-	if ((oflags & O_RDWR) == O_RDWR) {
+	if (accmode == O_WRONLY) {
+	    return MODE_BINARY("a", "ab");
+	}
+	if (accmode == O_RDWR) {
 	    return MODE_BINARY("a+", "ab+");
 	}
-	return MODE_BINARY("a", "ab");
     }
     switch (oflags & (O_RDONLY|O_WRONLY|O_RDWR)) {
       case O_RDONLY:
-- 
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