From 556a7ac35fb1e64c35c56d9c09f2c6f6ee0a1209 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 6 Nov 2005 11:18:57 +0000
Subject: [PATCH] * file.c (rb_file_s_readlink): readlink(2) on AIX fails with
 ERANGE if   buffer size is less than required.  fixed: [ruby-dev:27634]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9505 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog | 5 +++++
 file.c    | 8 +++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 5a1bc8e600..6fc178b9c3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Nov  6 20:13:27 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* file.c (rb_file_s_readlink): readlink(2) on AIX fails with ERANGE if
+	  buffer size is less than required.  fixed: [ruby-dev:27634]
+
 Sat Nov  5 13:42:50 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* configure.in, cygwin/GNUmakefile.in (mingw): use def file to alias
diff --git a/file.c b/file.c
index c1a69575f6..38db9d84ba 100644
--- a/file.c
+++ b/file.c
@@ -1982,7 +1982,13 @@ rb_file_s_readlink(VALUE klass, VALUE path)
     rb_secure(2);
     FilePathValue(path);
     buf = xmalloc(size);
-    while ((rv = readlink(StringValueCStr(path), buf, size)) == size) {
+    for (;;) {
+	rv = readlink(RSTRING(path)->ptr, buf, size);
+#ifndef _AIX
+	if (rv != size) break;
+#else
+	if (rv > 0 || errno != ERANGE) break;
+#endif
 	size *= 2;
 	buf = xrealloc(buf, size);
     }