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Subject:	Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 2.6.0-0.12
From:	Denis Excoffier <cygwin AT Denis-Excoffier DOT org>
In-Reply-To:	<announce.20160823165646.GB2261@calimero.vinschen.de>
Date:	Wed, 24 Aug 2016 18:07:09 +0200
Message-Id:	<3C55C207-0928-4835-84EE-B0F34FAAD647@Denis-Excoffier.org>
References:	<announce DOT 20160823165646 DOT GB2261 AT calimero DOT vinschen DOT de>
To:	The Cygwin Mailing List <cygwin AT cygwin DOT com>
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id u7OG7ci5018953

> On 2016-08-23 18:56, Corinna Vinschen <corinna-cygwin AT cygwin DOT com> wrote:
> 
> I uploaded a new Cygwin test release 2.6.0-0.12.
> 
...
> The 2.6.0 release is going to introducing the locale_t datatype, as well
> as all functions related to locale_t locales and per-thread locales per
> POSIX-1.2008.
> 
> So, rather than just providing a single, per-process locale, you can now
> create new locales ("newlocale") and set it as locale for the current
> thread ("uselocale") or use it directly with one of the new functions
> taking a locale_t as parameter (i.e. isalpha_l).
> 
> Since this is brand-new code, this code *will* have bugs.
> 
> It would be very helpful if interested developers and Cygwin package
> maintainers could give this new stuff some good testing.
> 

Hello,

I have exercised the new locale-related code and think i found a problem
in the strtod_l function (see small test case in gugu.c below).

I use 2.6.0-0.12 under CYGWIN_NT-6.1-WOW.

Remarks:
- the value given in nptr (1.5) has no impact, even an integer value fails
- uncomment the first line in order to silence the warning at compile time
- the problem was originally found in coreutils-8.25: "seq -w 1 10" produces
the same segmentation fault. In order to reproduce this, you must have
coreutils compiled under a recent cygwin1.dll otherwise the strtod_l
part of the coreutils code is not selected.

Regards,

Denis Excoffier.

% cat gugu.c
//#define _GNU_SOURCE 1
#include <stdio.h>
#include <locale.h>
#include <stdlib.h>

//
int main() {
//
  locale_t locale = newlocale (LC_ALL_MASK, "C", (locale_t) 0);
  if (!locale) return 1;
  char const *nptr = "1.5";
  char **endptr;
  double r1 = strtod (nptr, endptr);
  fprintf (stderr, "r1=%f\n", r1);
  double r2 = strtod_l (nptr, endptr, locale);
  fprintf (stderr, "r2=%f\n", r2);
  return 0;
};
% gcc -O -o gugu gugu.c
gugu.c: In function 'main':
gugu.c:15:15: warning: implicit declaration of function 'strtod_l' [-Wimplicit-function-declaration]
   double r2 = strtod_l (nptr, endptr, locale);
               ^~~~~~~~
% ./gugu
r1=1.500000
Segmentation fault (core dumped)
% cat gugu.exe.stackdump
Exception: STATUS_ACCESS_VIOLATION at eip=6114F2E8
eax=61213530 ebx=6121B0C0 ecx=6121B0D0 edx=6121B040 esi=00000000 edi=61213440
ebp=0028CC88 esp=0028CB68 program=D:\Users\dexcoff1\dexcoff1\cygscf\gugu.exe, pid 61032, thread main
cs=0023 ds=002B es=002B fs=0053 gs=002B ss=002B
Stack trace:
Frame     Function  Args
0028CC88  6114F2E8 (00000001, 0028CCAC, 80010108, 61007B0A)
0028CD28  61007B6F (00000000, 0028CD84, 61006BA0, 00000000)
End of stack trace
% objdump -d /usr/bin/cygwin1.dll
...
6114f2d0 <___localeconv_l>:
6114f2d0: 53                    push   %ebx
6114f2d1: 8b 44 24 08           mov    0x8(%esp),%eax
6114f2d5: 8b 88 48 01 00 00     mov    0x148(%eax),%ecx
6114f2db: 8b 90 40 01 00 00     mov    0x140(%eax),%edx
6114f2e1: 05 f0 00 00 00        add    $0xf0,%eax
6114f2e6: 8b 19                 mov    (%ecx),%ebx
6114f2e8: 89 18                 mov    %ebx,(%eax)
6114f2ea: 8b 59 04              mov    0x4(%ecx),%ebx
6114f2ed: 8b 49 08              mov    0x8(%ecx),%ecx
6114f2f0: 89 58 04              mov    %ebx,0x4(%eax)
6114f2f3: 89 48 08              mov    %ecx,0x8(%eax)
...
%


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