seq -0.1 0.1 2: print final number when locale's decimal point is ", "

[Jim Meyering]

I wrote the test, so here's the complete patch
I've just pushed into the upstream repository:

    http://git.sv.gnu.org/gitweb/?p=coreutils.git


>From e13188e7ef7bbd609c1586332a335b4194b881aa Mon Sep 17 00:00:00 2001
From: Jim Meyering <address@hidden>
Date: Thu, 25 Sep 2008 20:01:24 +0200
Subject: [PATCH] seq -0.1 0.1 2: print final number when locale's decimal point 
is ","
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit

* src/seq.c (print_numbers): Use strtold, not c_strtold to convert
from just-formatted-using-asprintf string back to double, since
asprintf may have used something other than "." as the decimal point.
Reported by address@hidden as <http://bugzilla.redhat.com/463556>.
Thanks to Ondřej Vašík for discovering that the bug was locale-related.

    $ LC_ALL=cs_CZ.UTF-8 seq -0.1 0.1 2|grep 2.0
    [Exit 1]
    $ seq -0.1 0.1 2|grep 2.0
    2.0

* tests/check.mk (TESTS_ENVIRONMENT): Add LOCALE_FR_UTF8, for...
* tests/misc/seq [locale-dec-pt]: New test for the above.
* NEWS (bug fix): Mention it.
---
 NEWS           |    3 +++
 src/seq.c      |    2 +-
 tests/check.mk |    1 +
 tests/misc/seq |   15 +++++++++++++++
 4 files changed, 20 insertions(+), 1 deletions(-)

diff --git a/NEWS b/NEWS
index 2549d41..77458d6 100644
--- a/NEWS
+++ b/NEWS
@@ -55,6 +55,9 @@ GNU coreutils NEWS                                    -*- 
outline -*-
   od no longer suffers from platform bugs in printf(3).  This is
   probably most noticeable when using 'od -tfL' to print long doubles.

+  seq -0.1 0.1 2 now prints 2,0 when locale's decimal point is ",".
+  Before, it would mistakenly omit the final number in that example.
+
   shuf honors the --zero-terminated (-z) option, even with --input-range=LO-HI

   shuf --head-count is now correctly documented.  The documentation
diff --git a/src/seq.c b/src/seq.c
index 55518df..b5f0651 100644
--- a/src/seq.c
+++ b/src/seq.c
@@ -306,7 +306,7 @@ print_numbers (char const *fmt, struct layout layout,
                xalloc_die ();
              x_str[x_strlen - layout.suffix_len] = '\0';

-             if (xstrtold (x_str + layout.prefix_len, NULL, &x_val, c_strtold)
+             if (xstrtold (x_str + layout.prefix_len, NULL, &x_val, strtold)
                  && abs_rel_diff (x_val, last) < DBL_EPSILON)
                {
                  char *x0_str = NULL;
diff --git a/tests/check.mk b/tests/check.mk
index 03b89dc..9263c67 100644
--- a/tests/check.mk
+++ b/tests/check.mk
@@ -69,6 +69,7 @@ TESTS_ENVIRONMENT =                           \
   };                                           \
   export                                       \
   LOCALE_FR='$(LOCALE_FR)'                     \
+  LOCALE_FR_UTF8='$(LOCALE_FR_UTF8)'           \
   abs_top_builddir='$(abs_top_builddir)'       \
   abs_top_srcdir='$(abs_top_srcdir)'           \
   abs_srcdir='$(abs_srcdir)'                   \
diff --git a/tests/misc/seq b/tests/misc/seq
index f68d74c..8e76f42 100755
--- a/tests/misc/seq
+++ b/tests/misc/seq
@@ -26,6 +26,10 @@ use strict;
 my $prog = 'seq';
 my $try_help = "Try `$prog --help' for more information.\n";

+my $locale = $ENV{LOCALE_FR_UTF8};
+! defined $locale || $locale eq 'none'
+  and $locale = 'C';
+
 my @Tests =
   (
    ['onearg-1',        qw(10),         {OUT => [(1..10)]}],
@@ -88,6 +92,17 @@ my @Tests =
     {ERR => "seq: no % directive in format string `'\n" . $try_help }],
    ['fmt-e',   qw(-f %g%g 1), {EXIT => 1},
     {ERR => "seq: too many % directives in format string `%g%g'\n"}],
+
+   # With coreutils-6.12 and earlier, with a UTF8 numeric locale that uses
+   # something other than "." as the decimal point, this use of seq would
+   # fail to print the "2,0" endpoint.
+   ['locale-dec-pt', qw(-0.1 0.1 2),
+    {OUT => [qw(-0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
+                        1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0)]},
+
+    {ENV => "LC_ALL=$locale"},
+    {OUT_SUBST => 's/,/./g'},
+    ],
   );

 # Append a newline to each entry in the OUT array.
--
1.6.0.2.307.gc427