Forum: Ruby-core [Backport 200 - Backport #7996][Open] Non-existent code page on certain windows XP versions

Issue #7996 has been reported by mmeltner (Michael Meltner).

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Backport #7996: Non-existent code page on certain windows XP versions
https://bugs.ruby-lang.org/issues/7996

Author: mmeltner (Michael Meltner)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:


Hello,

I try to run ruby 2.0.0p0 on a machine having Windows XP embedded. This 
causes a core dump. I tracked to problem to "win32/file.c", 
convert_mb_to_wchar.

Here the conversion is done from ascii 7 bit to wchar using 
MultiByteToWideChar. This function returns 0 (instead of the length) as 
this Windows XP embedded has no coding support for code page 20217(us 
ascii). So MultiByteToWideChar returns an error indicating failure.

I changed the default coding page to 1252 as this is supported on all 
windows versions and this coding page should be identical with ascii 7 
bit for the range 0x20-0x7f (or am I wrong here?)

So I made this patch which works fine:

diff -rupN ruby-2.0.0-p0/win32/file.c ruby-2.0.0-p0.new/win32/file.c
--- ruby-2.0.0-p0/win32/file.c  2012-11-17 18:53:21 +0100
+++ ruby-2.0.0-p0.new/win32/file.c  2013-02-28 11:43:29 +0100
@@ -212,9 +212,10 @@ code_page(rb_encoding *enc)
   names_ary = rb_funcall(encoding, names, 0);
     }

-    /* map US-ASCII and ASCII-8bit as code page 20127 (us-ascii) */
+    /* map US-ASCII and ASCII-8bit as code page 1252 (us-ascii) */
+    /* code page 20127 (us-ascii) is not available on older WinXP 
systems*/
     if (enc == rb_usascii_encoding() || enc == rb_ascii8bit_encoding()) 
{
-  UINT code_page = 20127;
+  UINT code_page = 1252;
   rb_hash_aset(rb_code_page, name_key, INT2FIX(code_page));
   return code_page;
     }



- Michael