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From: "bruno at clisp dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug string/30620] New: wcscmp bug on platforms with unsigned
 wchar_t
Date: Thu, 06 Jul 2023 21:59:46 +0000
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X-Bugzilla-Version: 2.28
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30620

            Bug ID: 30620
           Summary: wcscmp bug on platforms with unsigned wchar_t
           Product: glibc
           Version: 2.28
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: string
          Assignee: unassigned at sourceware dot org
          Reporter: bruno at clisp dot org
  Target Milestone: ---

Created attachment 14956
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D14956&action=3Ded=
it
test case testt-wcscmp.c

When we have two wide-character strings such that wcscmp (input1, input2) <=
 0,
obviously we should have wcscmp (input2, input1) > 0. This is not the case =
on
glibc on platforms which have an unsigned 'wchar_t' type (such as aarch64).

On platforms with a signed 'wchar_t' type (such as alpha), there is no prob=
lem.

How to reproduce: On a Linux/aarch64 machine, such as gcc185.fsffrance.org,=
 run
the attached program:
$ gcc test-wcscmp.c
$ ./a.out=20

Expected behaviour: Successful termination.

Actual behaviour:
test-wcscmp.c:107: assertion 'wcscmp (input2, input1) > 0' failed
Aborted (core dumped)

The problematic source code appears to be in the file glibc/wcsmbs/wcscmp.c=
 .

The function wcsncmp, OTOH, works fine.

--=20
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