Feature #4224: inconsistent behavior of 'puts "\xFF"'
http://redmine.ruby-lang.org/issues/show/4224

Author: Heesob Park
Status: Open, Priority: Normal
Category: core, Target version: 1.9.3

C:\work>ruby -ve 'puts "\xFFabc"'
ruby 1.9.3dev (2010-12-28 trunk 30412) [i386-mswin32_90]
-e:1:in `write': "\xFF" on CP949 (Encoding::InvalidByteSequenceError)
        from -e:1:in `puts'
        from -e:1:in `puts'
        from -e:1:in `<main>'


$ ruby -ve 'puts "\xFFabc"'
ruby 1.9.3dev (2010-12-02) [i686-linux]
 abc

C:\>ruby -ve 'puts "\xFFabc"'
ruby 1.9.2p136 (2010-12-25) [i386-mingw32]
 abc

The trunk version raises Encoding::InvalidByteSequenceError on Windows.
But, on the other version and other platform, it works without error.
What is the proper behavior?

I think this error could be avoided by following patch:

--- win32.c     2010-12-28 13:59:30.000000000 +0900
+++ win32.c.new 2010-12-28 14:00:18.000000000 +0900
@@ -5312,7 +5312,7 @@
        !rb_econv_has_convpath_p(rb_enc_name(rb_enc_get(str)), "UTF-16LE"))
        return -1L;

-    str = rb_str_encode(str, rb_enc_from_encoding(rb_enc_find("UTF-16LE")), 0,
+    str = rb_str_encode(str, rb_enc_from_encoding(rb_enc_find("UTF-16LE")), ECONV_INVALID_REPLACE|ECONV_UNDEF_REPLACE,
                        Qnil);
     if (!WriteConsoleW(handle, (LPWSTR)RSTRING_PTR(str), RSTRING_LEN(str)/2,
                       &reslen, NULL)) {


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