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
...

1 files changed, 3 insertions, 2 deletions

diff --git a/src/cut.c b/src/cut.c
index e0ce42a6b..f6254e45b 100644
--- a/src/cut.c
+++ b/src/cut.c
@@ -1,5 +1,5 @@
 /* cut - remove parts of lines of files
-   Copyright (C) 1997-2007 Free Software Foundation, Inc.
+   Copyright (C) 1997-2008 Free Software Foundation, Inc.
    Copyright (C) 1984 David M. Ihnat
 
    This program is free software: you can redistribute it and/or modify
@@ -372,7 +372,8 @@ set_fields (const char *fieldstr)
 	  initial = (lhs_specified ? value : 1);
 	  value = 0;
 	}
-      else if (*fieldstr == ',' || isblank (*fieldstr) || *fieldstr == '\0')
+      else if (*fieldstr == ',' ||
+	       isblank (to_uchar (*fieldstr)) || *fieldstr == '\0')
 	{
 	  in_digits = false;
 	  /* Ending the string, or this field/byte sublist. */