argp: fix test failure

* lib/argp-help.c (hol_entry_cmp): Don't use _tolower on values
that are not upper-case.  Pass correct range to tolower.

Signed-off-by: Eric Blake <ebb9@byu.net>

diff --git a/ChangeLog b/ChangeLog
index f7ef1d6..86710ce 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2009-09-28  Eric Blake  <ebb9@byu.net>
+
+       argp: fix test failure
+       * lib/argp-help.c (hol_entry_cmp): Don't use _tolower on values
+       that are not upper-case.  Pass correct range to tolower.
+
 2009-09-27  Jim Meyering  <meyering@redhat.com>
 
        test-yesno: work around sparc-dash here-document infelicity

diff --git a/lib/argp-help.c b/lib/argp-help.c
index a9843c0..150a0ad 100644 (file)
--- a/lib/argp-help.c
+++ b/lib/argp-help.c
@@ -1,5 +1,5 @@
 /* Hierarchial argument parsing help output
-   Copyright (C) 1995-2005, 2007 Free Software Foundation, Inc.
+   Copyright (C) 1995-2005, 2007, 2009 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Written by Miles Bader <miles@gnu.ai.mit.edu>.
 
@@ -797,13 +797,11 @@ hol_entry_cmp (const struct hol_entry *entry1,
           first, but as they're not displayed, it doesn't matter where
           they are.  */
        {
-         char first1 = short1 ? short1 : long1 ? *long1 : 0;
-         char first2 = short2 ? short2 : long2 ? *long2 : 0;
-#ifdef _tolower
-         int lower_cmp = _tolower (first1) - _tolower (first2);
-#else
+         unsigned char first1 = short1 ? short1 : long1 ? *long1 : 0;
+         unsigned char first2 = short2 ? short2 : long2 ? *long2 : 0;
+         /* Use tolower, not _tolower, since only the former is
+            guaranteed to work on something already lower case.  */
          int lower_cmp = tolower (first1) - tolower (first2);
-#endif
          /* Compare ignoring case, except when the options are both the
             same letter, in which case lower-case always comes first.  */
          return lower_cmp ? lower_cmp :