avoid problems with sign-extended "char" operand to is* functions

* src/cut.c (set_fields): Apply to_uchar to isblank operands.
* src/uniq.c (find_field): Likewise.
* src/seq.c (scan_arg): Likewise, for isspace.
* tests/misc/uniq: New file.  Test for the above, but only
when isspace(0240).
* tests/Makefile.am (TESTS): Add misc/uniq.
* configure.ac: Use gt_LOCALE_FR.
* tests/check.mk (TESTS_ENVIRONMENT): Propagate LOCALE_FR to scripts.
* NEWS: Mention the bug fixes.

Before this patch, on FreeBSD 6:

  $ printf 'x y z\nx \xa0 y z\n' > in
  $ LC_ALL=fr_FR.UTF-8 uniq -f2 in|tr ' ' .
  x.y.z
  x. .y.z

With the patch:

  $ LC_ALL=fr_FR.UTF-8 uniq -f2 in|tr ' ' .
  x.y.z

This also affected many other locales:
for i in $(locale -a); do test $(LC_ALL=$i ./uniq -f1 in|wc -l)
  = $(LC_ALL=$i uniq -f1 in|wc -l) || echo $i ; done
...
en_GB.ISO8859-1
en_GB.ISO8859-15
en_GB.UTF-8
en_IE.UTF-8
en_NZ.ISO8859-1
en_NZ.ISO8859-15
en_NZ.UTF-8
en_US.ISO8859-1
en_US.ISO8859-15
en_US.UTF-8
...

3 files changed, 60 insertions, 0 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 343d71948..515cfe6fe 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -211,6 +211,7 @@ TESTS =						\
   misc/tsort					\
   misc/tty-eof					\
   misc/unexpand					\
+  misc/uniq					\
   chmod/c-option				\
   chmod/equal-x					\
   chmod/equals					\
diff --git a/tests/check.mk b/tests/check.mk
index f62661ca0..abe03afcf 100644
--- a/tests/check.mk
+++ b/tests/check.mk
@@ -45,6 +45,7 @@ built_programs = \
 
 # Append this, because automake does the same.
 TESTS_ENVIRONMENT =				\
+  LOCALE_FR='$(LOCALE_FR)'			\
   abs_top_builddir='$(abs_top_builddir)'	\
   abs_top_srcdir='$(abs_top_srcdir)'		\
   built_programs="`$(built_programs)`"		\
diff --git a/tests/misc/uniq b/tests/misc/uniq
new file mode 100755
index 000000000..6587844ce
--- /dev/null
+++ b/tests/misc/uniq
@@ -0,0 +1,58 @@
+#!/bin/sh
+# Test for a subtle, system-and-locale-dependent bug in uniq.
+
+# Copyright (C) 2008 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+case $LOCALE_FR in
+''|none) echo "$0: skipping this test -- no appropriate locale" 1>&2; exit 77;;
+esac
+
+: ${srcdir=.}
+. $top_srcdir/tests/require-perl
+
+me=`echo $0|sed 's,.*/,,'`
+exec $PERL -w -I$top_srcdir/tests -MCoreutils -M"CuTmpdir qw($me)" -- - <<\EOF
+require 5.003;
+use strict;
+
+my $prog = 'uniq';
+
+# Turn off localization of executable's output.
+@ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;
+
+# I've only ever triggered the problem in a non-C locale.
+my $locale = $ENV{LOCALE_FR};
+
+# See if isblank returns true for nbsp.
+my $x = `env printf '\xa0'| LC_ALL=$locale tr '[:blank:]' x`;
+# If so, expect just one line of output in the schar test.
+# Otherwise, expect two.
+my $in = " y z\n\xa0 y z\n";
+my $schar_exp = $x eq 'x' ? " y z\n" : $in;
+
+my @Tests =
+    (
+     ['schar', '-f1',  {IN => $in}, {OUT => $schar_exp},
+      {ENV => "LC_ALL=$locale"},
+     ],
+    );
+
+my $save_temps = $ENV{DEBUG};
+my $verbose = $ENV{VERBOSE};
+
+my $fail = run_tests ($prog, $prog, \@Tests, $save_temps, $verbose);
+exit $fail;
+EOF