c/3804: Extended ASCII "wide" characters not behaving with UTF-8 locale

[alex at rent-a-mind dot com]

>Number:         3804
>Category:       c
>Synopsis:       Extended ASCII "wide" characters not behaving with UTF-8 locale
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Tue Jul 24 16:56:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Alex Eulenberg
>Release:        3.0.1 20010716 (prerelease)
>Organization:
>Environment:
RedHat 7.1 / i686, glibc-2.2.2
>Description:
Locale-dependent string formatting does not work with UTF-8-based locales (and probably other multibyte locales). There are two bugs, one new as of 3.0, and the other present at least since 2.95. Both bugs are revealed by compiling the same source code and running the executable under various locales.

First, the new bug. The example C code at http://www.cl.cam.ac.uk/~mgk25/unicode.html#c works fine under gcc 2.95.3, but breaks under 3.0 and current prerelease (20010716). It is supposed to produce ISO-8859-1 output when the locale is de_DE, but UTF-8 output when locale is de_DE.utf8. When compiled with gcc 3.0, running the executable in UTF-8 mode results in replacing the first byte of each UTF-8 two-byte sequence (should be C3) with five bytes (FF.BF.BF.BF.BF). If the extended ASCII characters (umlautted o and u, double-s) in the wide string literal are replaced with their ISO-8859-1 octal-escape equivalents, (\366, \374, \337) the resulting executable does behave properly when LANG=de_DE.utf8. It does not matter what the locale setting is when the program is compiled.

Now the old bug:

It does not matter what the locale setting is when the program is compiled. When the locale is a UTF-8 locale, wide strings in the source code should be interpreted accordingly. It is not. The source file's encoding is always assumed to be ISO-8859-1.

>How-To-Repeat:
Make sure you have UTF-8 locales installed. RedHat 7.1 comes with them. For bug 1, compile attached code (adapted from Markus Kuhn's Unicode FAQ). Run a.out with LANG=de_DE (or en_US) and with LANG=de_DE.utf8 (or en_US.utf8). The output is two lines. They should be the same before the dash no mattter what the locale.

For bug 2, convert attached source code from ISO-8859-1 encoding to UTF-8 encoding (using "iconv --from-code=latin1 --to-code=utf-8") and compile the code with LANG=en_US.utf8. The correct result would be to get the same object file as compiling the original source code under LANG=en_US. Instead, the executable outputs UTF-8 when LANG=en_US, and garbage when LANG=en_US.utf8.
>Fix:
Have iconv convert the contents of literal wide strings (and characters) according to locale before converting them to wchar_t (arrays).
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="localetest.i"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="localetest.i"

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