This set of modules implements the <ctype.h> function tolower_l, toupper_l
for all platforms.


2025-02-16  Bruno Haible  <br...@clisp.org>

        toupper_l: Add tests.
        * tests/test-toupper_l.c: New file, based on tests/test-c32toupper.c.
        * modules/toupper_l-tests: New file.

        toupper_l: New module.
        * lib/ctype.in.h: (toupper_l): New declaration.
        * lib/toupper_l.c: New file.
        * m4/toupper_l.m4: New file.
        * m4/ctype_h.m4 (gl_CTYPE_H): Test for toupper_l.
        (gl_CTYPE_H_REQUIRE_DEFAULTS): Initialize GNULIB_TOUPPER_L.
        (gl_CTYPE_H_DEFAULTS): Initialize HAVE_TOUPPER_L.
        * modules/ctype-h (Makefile.am): Substitute GNULIB_TOUPPER_L,
        HAVE_TOUPPER_L.
        * modules/toupper_l: New file.
        * tests/test-ctype-h-c++.cc: Check declaration of toupper_l.
        * doc/posix-functions/toupper_l.texi: Mention the new module.

2025-02-16  Bruno Haible  <br...@clisp.org>

        tolower_l: Add tests.
        * tests/test-tolower_l.c: New file, based on tests/test-c32tolower.c.
        * modules/tolower_l-tests: New file.

        tolower_l: New module.
        * lib/ctype.in.h: (tolower_l): New declaration.
        * lib/tolower_l.c: New file.
        * lib/to_l-impl.h: New file.
        * m4/tolower_l.m4: New file.
        * m4/ctype_h.m4 (gl_CTYPE_H): Test for tolower_l.
        (gl_CTYPE_H_REQUIRE_DEFAULTS): Initialize GNULIB_TOLOWER_L.
        (gl_CTYPE_H_DEFAULTS): Initialize HAVE_TOLOWER_L.
        * modules/ctype-h (Makefile.am): Substitute GNULIB_TOLOWER_L,
        HAVE_TOLOWER_L.
        * modules/tolower_l: New file.
        * tests/test-ctype-h-c++.cc: Check declaration of tolower_l.
        * doc/posix-functions/tolower_l.texi: Mention the new module.

>From 0a0d7cdf0a5dde1a96b977d5cc7d63e3a40b2b96 Mon Sep 17 00:00:00 2001
From: Bruno Haible <br...@clisp.org>
Date: Sun, 16 Feb 2025 06:45:57 +0100
Subject: [PATCH 1/4] tolower_l: New module.

* lib/ctype.in.h: (tolower_l): New declaration.
* lib/tolower_l.c: New file.
* lib/to_l-impl.h: New file.
* m4/tolower_l.m4: New file.
* m4/ctype_h.m4 (gl_CTYPE_H): Test for tolower_l.
(gl_CTYPE_H_REQUIRE_DEFAULTS): Initialize GNULIB_TOLOWER_L.
(gl_CTYPE_H_DEFAULTS): Initialize HAVE_TOLOWER_L.
* modules/ctype-h (Makefile.am): Substitute GNULIB_TOLOWER_L,
HAVE_TOLOWER_L.
* modules/tolower_l: New file.
* tests/test-ctype-h-c++.cc: Check declaration of tolower_l.
* doc/posix-functions/tolower_l.texi: Mention the new module.
---
 ChangeLog                          | 16 ++++++++++
 doc/posix-functions/tolower_l.texi |  9 +++---
 lib/ctype.in.h                     | 21 +++++++++++-
 lib/to_l-impl.h                    | 51 ++++++++++++++++++++++++++++++
 lib/tolower_l.c                    | 31 ++++++++++++++++++
 m4/ctype_h.m4                      |  7 ++--
 m4/tolower_l.m4                    | 23 ++++++++++++++
 modules/ctype-h                    |  2 ++
 modules/tolower_l                  | 33 +++++++++++++++++++
 tests/test-ctype-h-c++.cc          |  4 +++
 10 files changed, 190 insertions(+), 7 deletions(-)
 create mode 100644 lib/to_l-impl.h
 create mode 100644 lib/tolower_l.c
 create mode 100644 m4/tolower_l.m4
 create mode 100644 modules/tolower_l

diff --git a/ChangeLog b/ChangeLog
index c489a34df6..939915b297 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,19 @@
+2025-02-16  Bruno Haible  <br...@clisp.org>
+
+	tolower_l: New module.
+	* lib/ctype.in.h: (tolower_l): New declaration.
+	* lib/tolower_l.c: New file.
+	* lib/to_l-impl.h: New file.
+	* m4/tolower_l.m4: New file.
+	* m4/ctype_h.m4 (gl_CTYPE_H): Test for tolower_l.
+	(gl_CTYPE_H_REQUIRE_DEFAULTS): Initialize GNULIB_TOLOWER_L.
+	(gl_CTYPE_H_DEFAULTS): Initialize HAVE_TOLOWER_L.
+	* modules/ctype-h (Makefile.am): Substitute GNULIB_TOLOWER_L,
+	HAVE_TOLOWER_L.
+	* modules/tolower_l: New file.
+	* tests/test-ctype-h-c++.cc: Check declaration of tolower_l.
+	* doc/posix-functions/tolower_l.texi: Mention the new module.
+
 2025-02-15  Bruno Haible  <br...@clisp.org>
 
 	isxdigit_l: Add tests.
diff --git a/doc/posix-functions/tolower_l.texi b/doc/posix-functions/tolower_l.texi
index 0a6dcb5df0..bf0c010d6c 100644
--- a/doc/posix-functions/tolower_l.texi
+++ b/doc/posix-functions/tolower_l.texi
@@ -4,15 +4,16 @@
 
 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/tolower_l.html}
 
-Gnulib module: ---
+Gnulib module: tolower_l
+@mindex tolower_l
 
 Portability problems fixed by Gnulib:
 @itemize
+@item
+This function is missing on many platforms:
+FreeBSD 9.0, NetBSD 6.1, OpenBSD 6.1, Minix 3.1.8, AIX 6.1, HP-UX 11, Solaris 11.3, Cygwin 2.5.x, mingw, MSVC 14, Android 4.4.
 @end itemize
 
 Portability problems not fixed by Gnulib:
 @itemize
-@item
-This function is missing on many platforms:
-FreeBSD 6.0, NetBSD 5.0, OpenBSD 6.0, Minix 3.1.8, AIX 5.1, HP-UX 11, Solaris 11.3, Cygwin 1.7.x, mingw, MSVC 14, Android 4.4.
 @end itemize
diff --git a/lib/ctype.in.h b/lib/ctype.in.h
index 0aa5175397..e5259709f0 100644
--- a/lib/ctype.in.h
+++ b/lib/ctype.in.h
@@ -57,7 +57,8 @@
 #if (@GNULIB_ISALNUM_L@ || @GNULIB_ISALPHA_L@ || @GNULIB_ISBLANK_L@ \
      || @GNULIB_ISCNTRL_L@ || @GNULIB_ISDIGIT_L@ || @GNULIB_ISGRAPH_L@ \
      || @GNULIB_ISLOWER_L@ || @GNULIB_ISPRINT_L@ || @GNULIB_ISPUNCT_L@ \
-     || @GNULIB_ISSPACE_L@ || @GNULIB_ISUPPER_L@ || @GNULIB_ISXDIGIT_L@)
+     || @GNULIB_ISSPACE_L@ || @GNULIB_ISUPPER_L@ || @GNULIB_ISXDIGIT_L@ \
+     || @GNULIB_TOLOWER_L@)
 /* Get locale_t.  */
 # include <locale.h>
 #endif
@@ -295,6 +296,24 @@ _GL_WARN_ON_USE (isxdigit_l, "isxdigit_l is unportable - "
 # endif
 #endif
 
+/* Map c to lowercase.  */
+#if @GNULIB_TOLOWER_L@
+# if !@HAVE_TOLOWER_L@
+_GL_FUNCDECL_SYS (tolower_l, int, (int c, locale_t locale),
+                                  _GL_ARG_NONNULL ((2)));
+# endif
+_GL_CXXALIAS_SYS (tolower_l, int, (int c, locale_t locale));
+# if __GLIBC__ >= 2
+_GL_CXXALIASWARN (tolower_l);
+# endif
+#elif defined GNULIB_POSIXCHECK
+# undef tolower_l
+# if HAVE_RAW_DECL_TOLOWER_L
+_GL_WARN_ON_USE (tolower_l, "tolower_l is unportable - "
+                 "use gnulib module tolower_l for portability");
+# endif
+#endif
+
 #endif /* _@GUARD_PREFIX@_CTYPE_H */
 #endif
 #endif /* _@GUARD_PREFIX@_CTYPE_H */
diff --git a/lib/to_l-impl.h b/lib/to_l-impl.h
new file mode 100644
index 0000000000..63816aee3c
--- /dev/null
+++ b/lib/to_l-impl.h
@@ -0,0 +1,51 @@
+/* Test whether a single-byte character belongs to a specific character class.
+   Copyright (C) 2025 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <br...@clisp.org>, 2025.  */
+
+#include <locale.h>
+#include <stdio.h>
+
+int
+FUNC (int c, locale_t locale)
+{
+  struct gl_locale_category_t *plc =
+    &locale->category[gl_log2_lc_mask (LC_CTYPE)];
+  if (plc->is_c_locale)
+    /* Implementation for the "C" locale.  */
+    return C_FUNC (c);
+#if HAVE_WINDOWS_LOCALE_T
+# ifndef _UCRT
+  /* The old MSVCRT mistreats EOF.  */
+  if (c == EOF)
+    return c;
+# endif
+  return WINDOWS_FUNC (c, plc->system_locale);
+#else
+  /* Implementation for the global locale.  */
+  {
+    int ret;
+# if HAVE_WORKING_USELOCALE
+    locale_t saved_locale = uselocale (LC_GLOBAL_LOCALE);
+# endif
+    ret = GLOBAL_FUNC (c);
+# if HAVE_WORKING_USELOCALE
+    uselocale (saved_locale);
+# endif
+    return ret;
+  }
+#endif
+}
diff --git a/lib/tolower_l.c b/lib/tolower_l.c
new file mode 100644
index 0000000000..eb074eec2a
--- /dev/null
+++ b/lib/tolower_l.c
@@ -0,0 +1,31 @@
+/* Mapping a single-byte character to lowercase.
+   Copyright (C) 2025 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <br...@clisp.org>, 2025.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <ctype.h>
+
+#define FUNC tolower_l
+#define GLOBAL_FUNC tolower
+#define C_FUNC(c) \
+  (c >= 'A' && c <= 'Z' ? c - 'A' + 'a' : c)
+/* Documentation:
+   <https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/tolower-tolower-towlower-tolower-l-towlower-l>  */
+#define WINDOWS_FUNC _tolower_l
+#include "to_l-impl.h"
diff --git a/m4/ctype_h.m4 b/m4/ctype_h.m4
index 972144c93c..fa459e2b62 100644
--- a/m4/ctype_h.m4
+++ b/m4/ctype_h.m4
@@ -1,5 +1,5 @@
 # ctype_h.m4
-# serial 21
+# serial 22
 dnl Copyright (C) 2009-2025 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -17,7 +17,8 @@ AC_DEFUN_ONCE([gl_CTYPE_H]
   dnl corresponding gnulib module is not in use.
   gl_WARN_ON_USE_PREPARE([[#include <ctype.h>
     ]], [isalnum_l isalpha_l isblank isblank_l iscntrl_l isdigit_l isgraph_l
-    islower_l isprint_l ispunct_l isspace_l isupper_l isxdigit_l])
+    islower_l isprint_l ispunct_l isspace_l isupper_l isxdigit_l
+    tolower_l])
 ])
 
 # gl_CTYPE_MODULE_INDICATOR([modulename])
@@ -50,6 +51,7 @@ AC_DEFUN([gl_CTYPE_H_REQUIRE_DEFAULTS]
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISSPACE_L])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISUPPER_L])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISXDIGIT_L])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TOLOWER_L])
   ])
   m4_require(GL_MODULE_INDICATOR_PREFIX[_CTYPE_H_MODULE_INDICATOR_DEFAULTS])
   AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
@@ -71,4 +73,5 @@ AC_DEFUN([gl_CTYPE_H_DEFAULTS]
   HAVE_ISSPACE_L=1;   AC_SUBST([HAVE_ISSPACE_L])
   HAVE_ISUPPER_L=1;   AC_SUBST([HAVE_ISUPPER_L])
   HAVE_ISXDIGIT_L=1;  AC_SUBST([HAVE_ISXDIGIT_L])
+  HAVE_TOLOWER_L=1;   AC_SUBST([HAVE_TOLOWER_L])
 ])
diff --git a/m4/tolower_l.m4 b/m4/tolower_l.m4
new file mode 100644
index 0000000000..5859c60354
--- /dev/null
+++ b/m4/tolower_l.m4
@@ -0,0 +1,23 @@
+# tolower_l.m4
+# serial 1
+dnl Copyright (C) 2009-2025 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+dnl This file is offered as-is, without any warranty.
+
+AC_DEFUN([gl_FUNC_TOLOWER_L],
+[
+  AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
+
+  dnl Persuade glibc <ctype.h> to declare tolower_l().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_CHECK_FUNCS_ONCE([tolower_l])
+  if test $ac_cv_func_tolower_l = no; then
+    HAVE_TOLOWER_L=0
+  fi
+
+  dnl Prerequisites of lib/tolower_l.c.
+  AC_REQUIRE([gt_FUNC_USELOCALE])
+])
diff --git a/modules/ctype-h b/modules/ctype-h
index b5f428bb44..cf36d5e1da 100644
--- a/modules/ctype-h
+++ b/modules/ctype-h
@@ -43,6 +43,7 @@ ctype.h: ctype.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(WARN_ON_USE_H)
 	      -e 's/@''GNULIB_ISSPACE_L''@/$(GNULIB_ISSPACE_L)/g' \
 	      -e 's/@''GNULIB_ISUPPER_L''@/$(GNULIB_ISUPPER_L)/g' \
 	      -e 's/@''GNULIB_ISXDIGIT_L''@/$(GNULIB_ISXDIGIT_L)/g' \
+	      -e 's/@''GNULIB_TOLOWER_L''@/$(GNULIB_TOLOWER_L)/g' \
 	      -e 's/@''HAVE_ISALNUM_L''@/$(HAVE_ISALNUM_L)/g' \
 	      -e 's/@''HAVE_ISALPHA_L''@/$(HAVE_ISALPHA_L)/g' \
 	      -e 's/@''HAVE_ISBLANK''@/$(HAVE_ISBLANK)/g' \
@@ -56,6 +57,7 @@ ctype.h: ctype.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(WARN_ON_USE_H)
 	      -e 's/@''HAVE_ISSPACE_L''@/$(HAVE_ISSPACE_L)/g' \
 	      -e 's/@''HAVE_ISUPPER_L''@/$(HAVE_ISUPPER_L)/g' \
 	      -e 's/@''HAVE_ISXDIGIT_L''@/$(HAVE_ISXDIGIT_L)/g' \
+	      -e 's/@''HAVE_TOLOWER_L''@/$(HAVE_TOLOWER_L)/g' \
 	      -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
 	      -e '/definition of _GL_WARN_ON_USE/r $(WARN_ON_USE_H)' \
 	      $(srcdir)/ctype.in.h > $@-t
diff --git a/modules/tolower_l b/modules/tolower_l
new file mode 100644
index 0000000000..c5387e548d
--- /dev/null
+++ b/modules/tolower_l
@@ -0,0 +1,33 @@
+Description:
+tolower_l() function: map a single-byte character to lowercase.
+
+Files:
+lib/tolower_l.c
+lib/to_l-impl.h
+m4/tolower_l.m4
+m4/intl-thread-locale.m4
+
+Depends-on:
+ctype-h
+locale-h
+extensions
+
+configure.ac:
+gl_FUNC_TOLOWER_L
+gl_CONDITIONAL([GL_COND_OBJ_TOLOWER_L], [test $HAVE_TOLOWER_L = 0])
+gl_MODULE_INDICATOR([tolower_l])
+gl_CTYPE_MODULE_INDICATOR([tolower_l])
+
+Makefile.am:
+if GL_COND_OBJ_TOLOWER_L
+lib_SOURCES += tolower_l.c
+endif
+
+Include:
+<ctype.h>
+
+License:
+LGPLv2+
+
+Maintainer:
+all
diff --git a/tests/test-ctype-h-c++.cc b/tests/test-ctype-h-c++.cc
index cce73591e4..578e99af31 100644
--- a/tests/test-ctype-h-c++.cc
+++ b/tests/test-ctype-h-c++.cc
@@ -76,6 +76,10 @@ SIGNATURE_CHECK (GNULIB_NAMESPACE::isupper_l, int, (int, locale_t));
 SIGNATURE_CHECK (GNULIB_NAMESPACE::isxdigit_l, int, (int, locale_t));
 #endif
 
+#if GNULIB_TEST_TOLOWER_L
+SIGNATURE_CHECK (GNULIB_NAMESPACE::tolower_l, int, (int, locale_t));
+#endif
+
 
 int
 main ()
-- 
2.43.0

>From 7cb1cb41bf89a735981a74fb9411837d367c20e6 Mon Sep 17 00:00:00 2001
From: Bruno Haible <br...@clisp.org>
Date: Sun, 16 Feb 2025 06:46:30 +0100
Subject: [PATCH 2/4] tolower_l: Add tests.

* tests/test-tolower_l.c: New file, based on tests/test-c32tolower.c.
* modules/tolower_l-tests: New file.
---
 ChangeLog               |   4 ++
 modules/tolower_l-tests |  16 +++++
 tests/test-tolower_l.c  | 148 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 168 insertions(+)
 create mode 100644 modules/tolower_l-tests
 create mode 100644 tests/test-tolower_l.c

diff --git a/ChangeLog b/ChangeLog
index 939915b297..8452a7a2d2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2025-02-16  Bruno Haible  <br...@clisp.org>
 
+	tolower_l: Add tests.
+	* tests/test-tolower_l.c: New file, based on tests/test-c32tolower.c.
+	* modules/tolower_l-tests: New file.
+
 	tolower_l: New module.
 	* lib/ctype.in.h: (tolower_l): New declaration.
 	* lib/tolower_l.c: New file.
diff --git a/modules/tolower_l-tests b/modules/tolower_l-tests
new file mode 100644
index 0000000000..5a08826b1f
--- /dev/null
+++ b/modules/tolower_l-tests
@@ -0,0 +1,16 @@
+Files:
+tests/test-tolower_l.c
+tests/signature.h
+tests/macros.h
+m4/musl.m4
+
+Depends-on:
+newlocale
+freelocale
+
+configure.ac:
+gl_MUSL_LIBC
+
+Makefile.am:
+TESTS += test-tolower_l
+check_PROGRAMS += test-tolower_l
diff --git a/tests/test-tolower_l.c b/tests/test-tolower_l.c
new file mode 100644
index 0000000000..501d62bcef
--- /dev/null
+++ b/tests/test-tolower_l.c
@@ -0,0 +1,148 @@
+/* Test of tolower_l() function.
+   Copyright (C) 2020-2025 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 <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <ctype.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (tolower_l, int, (int, locale_t));
+
+#include <locale.h>
+#include <stdio.h>
+
+#include "macros.h"
+
+static void
+test_single_locale_common (locale_t locale)
+{
+  int tc;
+
+  /* Test EOF.  */
+  tc = tolower_l (EOF, locale);
+  ASSERT (tc == EOF);
+
+  /* POSIX specifies in
+       <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap07.html>
+     that
+       - in all locales, the uppercase characters include the A ... Z
+         characters, and the corresponding characters a ... z (if not in a
+         Turkish locale) are lowercase,
+       - in the "POSIX" locale (which is usually the same as the "C" locale),
+         the uppercase characters include only the ASCII A ... Z characters,
+         and the corresponding characters a ... z are lowercase.
+   */
+  {
+    int c;
+
+    for (c = 0; c < 0x100; c++)
+      switch (c)
+        {
+        case '\t': case '\v': case '\f':
+        case ' ': case '!': case '"': case '#': case '%':
+        case '&': case '\'': case '(': case ')': case '*':
+        case '+': case ',': case '-': case '.': case '/':
+        case '0': case '1': case '2': case '3': case '4':
+        case '5': case '6': case '7': case '8': case '9':
+        case ':': case ';': case '<': case '=': case '>':
+        case '?':
+        case 'A': case 'B': case 'C': case 'D': case 'E':
+        case 'F': case 'G': case 'H': case 'I': case 'J':
+        case 'K': case 'L': case 'M': case 'N': case 'O':
+        case 'P': case 'Q': case 'R': case 'S': case 'T':
+        case 'U': case 'V': case 'W': case 'X': case 'Y':
+        case 'Z':
+        case '[': case '\\': case ']': case '^': case '_':
+        case 'a': case 'b': case 'c': case 'd': case 'e':
+        case 'f': case 'g': case 'h': case 'i': case 'j':
+        case 'k': case 'l': case 'm': case 'n': case 'o':
+        case 'p': case 'q': case 'r': case 's': case 't':
+        case 'u': case 'v': case 'w': case 'x': case 'y':
+        case 'z': case '{': case '|': case '}': case '~':
+          /* c is in the ISO C "basic character set".  */
+          tc = tolower_l ((unsigned char) c, locale);
+          switch (c)
+            {
+            case 'A': case 'B': case 'C': case 'D': case 'E':
+            case 'F': case 'G': case 'H': case 'I': case 'J':
+            case 'K': case 'L': case 'M': case 'N': case 'O':
+            case 'P': case 'Q': case 'R': case 'S': case 'T':
+            case 'U': case 'V': case 'W': case 'X': case 'Y':
+            case 'Z':
+              ASSERT (tc == (unsigned char) c - 'A' + 'a');
+              break;
+            default:
+              ASSERT (tc == c);
+              break;
+            }
+          break;
+        }
+  }
+}
+
+int
+main ()
+{
+  {
+    locale_t locale = newlocale (LC_ALL_MASK, "C", NULL);
+    ASSERT (locale != NULL);
+
+    test_single_locale_common (locale);
+
+    freelocale (locale);
+  }
+#if !MUSL_LIBC /* musl libc has no unibyte locales */
+  {
+# if defined _WIN32 && !defined __CYGWIN__
+    locale_t locale = newlocale (LC_ALL_MASK, "French_France.1252", NULL);
+# else
+    locale_t locale = newlocale (LC_ALL_MASK, "fr_FR.ISO-8859-1", NULL);
+    if (locale == NULL)
+      locale = newlocale (LC_ALL_MASK, "fr_FR.ISO8859-1", NULL);
+# endif
+    if (locale != NULL)
+      {
+        test_single_locale_common (locale);
+
+        /* Locale encoding is ISO-8859-1 or ISO-8859-15.  */
+        int tc;
+
+        /* U+00B2 SUPERSCRIPT TWO */
+        tc = tolower_l ((unsigned char) '\262', locale);
+        ASSERT (tc == (unsigned char) '\262');
+        /* U+00B5 MICRO SIGN */
+        tc = tolower_l ((unsigned char) '\265', locale);
+        ASSERT (tc == (unsigned char) '\265');
+        /* U+00C9 LATIN CAPITAL LETTER E WITH ACUTE */
+        tc = tolower_l ((unsigned char) '\311', locale);
+        ASSERT (tc == (unsigned char) '\351');
+        /* U+00DF LATIN SMALL LETTER SHARP S */
+        tc = tolower_l ((unsigned char) '\337', locale);
+        ASSERT (tc == (unsigned char) '\337');
+        /* U+00E9 LATIN SMALL LETTER E WITH ACUTE */
+        tc = tolower_l ((unsigned char) '\351', locale);
+        ASSERT (tc == (unsigned char) '\351');
+        /* U+00FF LATIN SMALL LETTER Y WITH DIAERESIS */
+        tc = tolower_l ((unsigned char) '\377', locale);
+        ASSERT (tc == (unsigned char) '\377');
+
+        freelocale (locale);
+      }
+  }
+#endif
+
+  return test_exit_status;
+}
-- 
2.43.0

>From 6f8280181a4a09480febe7120b69116f2359dd4d Mon Sep 17 00:00:00 2001
From: Bruno Haible <br...@clisp.org>
Date: Sun, 16 Feb 2025 06:55:52 +0100
Subject: [PATCH 3/4] toupper_l: New module.

* lib/ctype.in.h: (toupper_l): New declaration.
* lib/toupper_l.c: New file.
* m4/toupper_l.m4: New file.
* m4/ctype_h.m4 (gl_CTYPE_H): Test for toupper_l.
(gl_CTYPE_H_REQUIRE_DEFAULTS): Initialize GNULIB_TOUPPER_L.
(gl_CTYPE_H_DEFAULTS): Initialize HAVE_TOUPPER_L.
* modules/ctype-h (Makefile.am): Substitute GNULIB_TOUPPER_L,
HAVE_TOUPPER_L.
* modules/toupper_l: New file.
* tests/test-ctype-h-c++.cc: Check declaration of toupper_l.
* doc/posix-functions/toupper_l.texi: Mention the new module.
---
 ChangeLog                          | 15 ++++++++++++++
 doc/posix-functions/toupper_l.texi |  9 ++++----
 lib/ctype.in.h                     | 20 +++++++++++++++++-
 lib/toupper_l.c                    | 31 ++++++++++++++++++++++++++++
 m4/ctype_h.m4                      |  6 ++++--
 m4/toupper_l.m4                    | 23 +++++++++++++++++++++
 modules/ctype-h                    |  2 ++
 modules/toupper_l                  | 33 ++++++++++++++++++++++++++++++
 tests/test-ctype-h-c++.cc          |  4 ++++
 9 files changed, 136 insertions(+), 7 deletions(-)
 create mode 100644 lib/toupper_l.c
 create mode 100644 m4/toupper_l.m4
 create mode 100644 modules/toupper_l

diff --git a/ChangeLog b/ChangeLog
index 8452a7a2d2..6a46a18615 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,18 @@
+2025-02-16  Bruno Haible  <br...@clisp.org>
+
+	toupper_l: New module.
+	* lib/ctype.in.h: (toupper_l): New declaration.
+	* lib/toupper_l.c: New file.
+	* m4/toupper_l.m4: New file.
+	* m4/ctype_h.m4 (gl_CTYPE_H): Test for toupper_l.
+	(gl_CTYPE_H_REQUIRE_DEFAULTS): Initialize GNULIB_TOUPPER_L.
+	(gl_CTYPE_H_DEFAULTS): Initialize HAVE_TOUPPER_L.
+	* modules/ctype-h (Makefile.am): Substitute GNULIB_TOUPPER_L,
+	HAVE_TOUPPER_L.
+	* modules/toupper_l: New file.
+	* tests/test-ctype-h-c++.cc: Check declaration of toupper_l.
+	* doc/posix-functions/toupper_l.texi: Mention the new module.
+
 2025-02-16  Bruno Haible  <br...@clisp.org>
 
 	tolower_l: Add tests.
diff --git a/doc/posix-functions/toupper_l.texi b/doc/posix-functions/toupper_l.texi
index 19c76c2a10..e4540df328 100644
--- a/doc/posix-functions/toupper_l.texi
+++ b/doc/posix-functions/toupper_l.texi
@@ -4,15 +4,16 @@
 
 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/toupper_l.html}
 
-Gnulib module: ---
+Gnulib module: toupper_l
+@mindex toupper_l
 
 Portability problems fixed by Gnulib:
 @itemize
+@item
+This function is missing on many platforms:
+FreeBSD 9.0, NetBSD 6.1, OpenBSD 6.1, Minix 3.1.8, AIX 6.1, HP-UX 11, Solaris 11.3, Cygwin 2.5.x, mingw, MSVC 14, Android 4.4.
 @end itemize
 
 Portability problems not fixed by Gnulib:
 @itemize
-@item
-This function is missing on many platforms:
-FreeBSD 6.0, NetBSD 5.0, OpenBSD 6.0, Minix 3.1.8, AIX 5.1, HP-UX 11, Solaris 11.3, Cygwin 1.7.x, mingw, MSVC 14, Android 4.4.
 @end itemize
diff --git a/lib/ctype.in.h b/lib/ctype.in.h
index e5259709f0..130ef7e0d3 100644
--- a/lib/ctype.in.h
+++ b/lib/ctype.in.h
@@ -58,7 +58,7 @@
      || @GNULIB_ISCNTRL_L@ || @GNULIB_ISDIGIT_L@ || @GNULIB_ISGRAPH_L@ \
      || @GNULIB_ISLOWER_L@ || @GNULIB_ISPRINT_L@ || @GNULIB_ISPUNCT_L@ \
      || @GNULIB_ISSPACE_L@ || @GNULIB_ISUPPER_L@ || @GNULIB_ISXDIGIT_L@ \
-     || @GNULIB_TOLOWER_L@)
+     || @GNULIB_TOLOWER_L@ || @GNULIB_TOUPPER_L@)
 /* Get locale_t.  */
 # include <locale.h>
 #endif
@@ -314,6 +314,24 @@ _GL_WARN_ON_USE (tolower_l, "tolower_l is unportable - "
 # endif
 #endif
 
+/* Map c to uppercase.  */
+#if @GNULIB_TOUPPER_L@
+# if !@HAVE_TOUPPER_L@
+_GL_FUNCDECL_SYS (toupper_l, int, (int c, locale_t locale),
+                                  _GL_ARG_NONNULL ((2)));
+# endif
+_GL_CXXALIAS_SYS (toupper_l, int, (int c, locale_t locale));
+# if __GLIBC__ >= 2
+_GL_CXXALIASWARN (toupper_l);
+# endif
+#elif defined GNULIB_POSIXCHECK
+# undef toupper_l
+# if HAVE_RAW_DECL_TOUPPER_L
+_GL_WARN_ON_USE (toupper_l, "toupper_l is unportable - "
+                 "use gnulib module toupper_l for portability");
+# endif
+#endif
+
 #endif /* _@GUARD_PREFIX@_CTYPE_H */
 #endif
 #endif /* _@GUARD_PREFIX@_CTYPE_H */
diff --git a/lib/toupper_l.c b/lib/toupper_l.c
new file mode 100644
index 0000000000..329c3950eb
--- /dev/null
+++ b/lib/toupper_l.c
@@ -0,0 +1,31 @@
+/* Mapping a single-byte character to uppercase.
+   Copyright (C) 2025 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <br...@clisp.org>, 2025.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <ctype.h>
+
+#define FUNC toupper_l
+#define GLOBAL_FUNC toupper
+#define C_FUNC(c) \
+  (c >= 'a' && c <= 'z' ? c - 'a' + 'A' : c)
+/* Documentation:
+   <https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/toupper-toupper-towupper-toupper-l-towupper-l>  */
+#define WINDOWS_FUNC _toupper_l
+#include "to_l-impl.h"
diff --git a/m4/ctype_h.m4 b/m4/ctype_h.m4
index fa459e2b62..fec7c458bb 100644
--- a/m4/ctype_h.m4
+++ b/m4/ctype_h.m4
@@ -1,5 +1,5 @@
 # ctype_h.m4
-# serial 22
+# serial 23
 dnl Copyright (C) 2009-2025 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -18,7 +18,7 @@ AC_DEFUN_ONCE([gl_CTYPE_H]
   gl_WARN_ON_USE_PREPARE([[#include <ctype.h>
     ]], [isalnum_l isalpha_l isblank isblank_l iscntrl_l isdigit_l isgraph_l
     islower_l isprint_l ispunct_l isspace_l isupper_l isxdigit_l
-    tolower_l])
+    tolower_l toupper_l])
 ])
 
 # gl_CTYPE_MODULE_INDICATOR([modulename])
@@ -52,6 +52,7 @@ AC_DEFUN([gl_CTYPE_H_REQUIRE_DEFAULTS]
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISUPPER_L])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ISXDIGIT_L])
     gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TOLOWER_L])
+    gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TOUPPER_L])
   ])
   m4_require(GL_MODULE_INDICATOR_PREFIX[_CTYPE_H_MODULE_INDICATOR_DEFAULTS])
   AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
@@ -74,4 +75,5 @@ AC_DEFUN([gl_CTYPE_H_DEFAULTS]
   HAVE_ISUPPER_L=1;   AC_SUBST([HAVE_ISUPPER_L])
   HAVE_ISXDIGIT_L=1;  AC_SUBST([HAVE_ISXDIGIT_L])
   HAVE_TOLOWER_L=1;   AC_SUBST([HAVE_TOLOWER_L])
+  HAVE_TOUPPER_L=1;   AC_SUBST([HAVE_TOUPPER_L])
 ])
diff --git a/m4/toupper_l.m4 b/m4/toupper_l.m4
new file mode 100644
index 0000000000..4283f3a76e
--- /dev/null
+++ b/m4/toupper_l.m4
@@ -0,0 +1,23 @@
+# toupper_l.m4
+# serial 1
+dnl Copyright (C) 2009-2025 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+dnl This file is offered as-is, without any warranty.
+
+AC_DEFUN([gl_FUNC_TOUPPER_L],
+[
+  AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
+
+  dnl Persuade glibc <ctype.h> to declare toupper_l().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_CHECK_FUNCS_ONCE([toupper_l])
+  if test $ac_cv_func_toupper_l = no; then
+    HAVE_TOUPPER_L=0
+  fi
+
+  dnl Prerequisites of lib/toupper_l.c.
+  AC_REQUIRE([gt_FUNC_USELOCALE])
+])
diff --git a/modules/ctype-h b/modules/ctype-h
index cf36d5e1da..56edc715b6 100644
--- a/modules/ctype-h
+++ b/modules/ctype-h
@@ -44,6 +44,7 @@ ctype.h: ctype.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(WARN_ON_USE_H)
 	      -e 's/@''GNULIB_ISUPPER_L''@/$(GNULIB_ISUPPER_L)/g' \
 	      -e 's/@''GNULIB_ISXDIGIT_L''@/$(GNULIB_ISXDIGIT_L)/g' \
 	      -e 's/@''GNULIB_TOLOWER_L''@/$(GNULIB_TOLOWER_L)/g' \
+	      -e 's/@''GNULIB_TOUPPER_L''@/$(GNULIB_TOUPPER_L)/g' \
 	      -e 's/@''HAVE_ISALNUM_L''@/$(HAVE_ISALNUM_L)/g' \
 	      -e 's/@''HAVE_ISALPHA_L''@/$(HAVE_ISALPHA_L)/g' \
 	      -e 's/@''HAVE_ISBLANK''@/$(HAVE_ISBLANK)/g' \
@@ -58,6 +59,7 @@ ctype.h: ctype.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(WARN_ON_USE_H)
 	      -e 's/@''HAVE_ISUPPER_L''@/$(HAVE_ISUPPER_L)/g' \
 	      -e 's/@''HAVE_ISXDIGIT_L''@/$(HAVE_ISXDIGIT_L)/g' \
 	      -e 's/@''HAVE_TOLOWER_L''@/$(HAVE_TOLOWER_L)/g' \
+	      -e 's/@''HAVE_TOUPPER_L''@/$(HAVE_TOUPPER_L)/g' \
 	      -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
 	      -e '/definition of _GL_WARN_ON_USE/r $(WARN_ON_USE_H)' \
 	      $(srcdir)/ctype.in.h > $@-t
diff --git a/modules/toupper_l b/modules/toupper_l
new file mode 100644
index 0000000000..613da36d24
--- /dev/null
+++ b/modules/toupper_l
@@ -0,0 +1,33 @@
+Description:
+toupper_l() function: map a single-byte character to uppercase.
+
+Files:
+lib/toupper_l.c
+lib/to_l-impl.h
+m4/toupper_l.m4
+m4/intl-thread-locale.m4
+
+Depends-on:
+ctype-h
+locale-h
+extensions
+
+configure.ac:
+gl_FUNC_TOUPPER_L
+gl_CONDITIONAL([GL_COND_OBJ_TOUPPER_L], [test $HAVE_TOUPPER_L = 0])
+gl_MODULE_INDICATOR([toupper_l])
+gl_CTYPE_MODULE_INDICATOR([toupper_l])
+
+Makefile.am:
+if GL_COND_OBJ_TOUPPER_L
+lib_SOURCES += toupper_l.c
+endif
+
+Include:
+<ctype.h>
+
+License:
+LGPLv2+
+
+Maintainer:
+all
diff --git a/tests/test-ctype-h-c++.cc b/tests/test-ctype-h-c++.cc
index 578e99af31..cbf51c415d 100644
--- a/tests/test-ctype-h-c++.cc
+++ b/tests/test-ctype-h-c++.cc
@@ -80,6 +80,10 @@ SIGNATURE_CHECK (GNULIB_NAMESPACE::isxdigit_l, int, (int, locale_t));
 SIGNATURE_CHECK (GNULIB_NAMESPACE::tolower_l, int, (int, locale_t));
 #endif
 
+#if GNULIB_TEST_TOUPPER_L
+SIGNATURE_CHECK (GNULIB_NAMESPACE::toupper_l, int, (int, locale_t));
+#endif
+
 
 int
 main ()
-- 
2.43.0

>From a0b454273ba98138542d619a472912384993b5c2 Mon Sep 17 00:00:00 2001
From: Bruno Haible <br...@clisp.org>
Date: Sun, 16 Feb 2025 07:02:50 +0100
Subject: [PATCH 4/4] toupper_l: Add tests.

* tests/test-toupper_l.c: New file, based on tests/test-c32toupper.c.
* modules/toupper_l-tests: New file.
---
 ChangeLog               |   4 ++
 modules/toupper_l-tests |  16 +++++
 tests/test-toupper_l.c  | 152 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 172 insertions(+)
 create mode 100644 modules/toupper_l-tests
 create mode 100644 tests/test-toupper_l.c

diff --git a/ChangeLog b/ChangeLog
index 6a46a18615..e0df514ecf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2025-02-16  Bruno Haible  <br...@clisp.org>
 
+	toupper_l: Add tests.
+	* tests/test-toupper_l.c: New file, based on tests/test-c32toupper.c.
+	* modules/toupper_l-tests: New file.
+
 	toupper_l: New module.
 	* lib/ctype.in.h: (toupper_l): New declaration.
 	* lib/toupper_l.c: New file.
diff --git a/modules/toupper_l-tests b/modules/toupper_l-tests
new file mode 100644
index 0000000000..bfd92effdd
--- /dev/null
+++ b/modules/toupper_l-tests
@@ -0,0 +1,16 @@
+Files:
+tests/test-toupper_l.c
+tests/signature.h
+tests/macros.h
+m4/musl.m4
+
+Depends-on:
+newlocale
+freelocale
+
+configure.ac:
+gl_MUSL_LIBC
+
+Makefile.am:
+TESTS += test-toupper_l
+check_PROGRAMS += test-toupper_l
diff --git a/tests/test-toupper_l.c b/tests/test-toupper_l.c
new file mode 100644
index 0000000000..69f769f646
--- /dev/null
+++ b/tests/test-toupper_l.c
@@ -0,0 +1,152 @@
+/* Test of toupper_l() function.
+   Copyright (C) 2020-2025 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 <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <ctype.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (toupper_l, int, (int, locale_t));
+
+#include <locale.h>
+#include <stdio.h>
+
+#include "macros.h"
+
+static void
+test_single_locale_common (locale_t locale)
+{
+  int tc;
+
+  /* Test EOF.  */
+  tc = toupper_l (EOF, locale);
+  ASSERT (tc == EOF);
+
+  /* POSIX specifies in
+       <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap07.html>
+     that
+       - in all locales, the lowercase characters include the a ... z
+         characters, and the corresponding characters A ... Z (if not in a
+         Turkish locale) are uppercase,
+       - in the "POSIX" locale (which is usually the same as the "C" locale),
+         the lowercase characters include only the ASCII a ... z characters,
+         and the corresponding characters A ... Z are uppercase.
+   */
+  {
+    int c;
+
+    for (c = 0; c < 0x100; c++)
+      switch (c)
+        {
+        case '\t': case '\v': case '\f':
+        case ' ': case '!': case '"': case '#': case '%':
+        case '&': case '\'': case '(': case ')': case '*':
+        case '+': case ',': case '-': case '.': case '/':
+        case '0': case '1': case '2': case '3': case '4':
+        case '5': case '6': case '7': case '8': case '9':
+        case ':': case ';': case '<': case '=': case '>':
+        case '?':
+        case 'A': case 'B': case 'C': case 'D': case 'E':
+        case 'F': case 'G': case 'H': case 'I': case 'J':
+        case 'K': case 'L': case 'M': case 'N': case 'O':
+        case 'P': case 'Q': case 'R': case 'S': case 'T':
+        case 'U': case 'V': case 'W': case 'X': case 'Y':
+        case 'Z':
+        case '[': case '\\': case ']': case '^': case '_':
+        case 'a': case 'b': case 'c': case 'd': case 'e':
+        case 'f': case 'g': case 'h': case 'i': case 'j':
+        case 'k': case 'l': case 'm': case 'n': case 'o':
+        case 'p': case 'q': case 'r': case 's': case 't':
+        case 'u': case 'v': case 'w': case 'x': case 'y':
+        case 'z': case '{': case '|': case '}': case '~':
+          /* c is in the ISO C "basic character set".  */
+          tc = toupper_l ((unsigned char) c, locale);
+          switch (c)
+            {
+            case 'a': case 'b': case 'c': case 'd': case 'e':
+            case 'f': case 'g': case 'h': case 'i': case 'j':
+            case 'k': case 'l': case 'm': case 'n': case 'o':
+            case 'p': case 'q': case 'r': case 's': case 't':
+            case 'u': case 'v': case 'w': case 'x': case 'y':
+            case 'z':
+              ASSERT (tc == (unsigned char) c - 'a' + 'A');
+              break;
+            default:
+              ASSERT (tc == c);
+              break;
+            }
+          break;
+        }
+  }
+}
+
+int
+main ()
+{
+  {
+    locale_t locale = newlocale (LC_ALL_MASK, "C", NULL);
+    ASSERT (locale != NULL);
+
+    test_single_locale_common (locale);
+
+    freelocale (locale);
+  }
+#if !MUSL_LIBC /* musl libc has no unibyte locales */
+  {
+# if defined _WIN32 && !defined __CYGWIN__
+    locale_t locale = newlocale (LC_ALL_MASK, "French_France.1252", NULL);
+# else
+    locale_t locale = newlocale (LC_ALL_MASK, "fr_FR.ISO-8859-1", NULL);
+    if (locale == NULL)
+      locale = newlocale (LC_ALL_MASK, "fr_FR.ISO8859-1", NULL);
+# endif
+    if (locale != NULL)
+      {
+        test_single_locale_common (locale);
+
+        /* Locale encoding is ISO-8859-1 or ISO-8859-15.  */
+        int tc;
+
+        /* U+00B2 SUPERSCRIPT TWO */
+        tc = toupper_l ((unsigned char) '\262', locale);
+        ASSERT (tc == (unsigned char) '\262');
+      #if !(defined __GLIBC__ || (defined __APPLE__ && defined __MACH__) || defined __FreeBSD__ || defined __NetBSD__ || defined __sun || defined __CYGWIN__ || (defined _WIN32 && !defined __CYGWIN__))
+        /* U+00B5 MICRO SIGN */
+        tc = toupper_l ((unsigned char) '\265', locale);
+        ASSERT (tc == (unsigned char) '\265');
+      #endif
+        /* U+00C9 LATIN CAPITAL LETTER E WITH ACUTE */
+        tc = toupper_l ((unsigned char) '\311', locale);
+        ASSERT (tc == (unsigned char) '\311');
+        /* U+00DF LATIN SMALL LETTER SHARP S */
+        tc = toupper_l ((unsigned char) '\337', locale);
+        ASSERT (tc == (unsigned char) '\337');
+        /* U+00E9 LATIN SMALL LETTER E WITH ACUTE */
+        tc = toupper_l ((unsigned char) '\351', locale);
+        ASSERT (tc == (unsigned char) '\311');
+      #if !(defined __GLIBC__ || (defined __APPLE__ && defined __MACH__) || defined __FreeBSD__ || defined __DragonFly__ || defined __NetBSD__ || defined __sun || defined __CYGWIN__ || (defined _WIN32 && !defined __CYGWIN__))
+        /* U+00FF LATIN SMALL LETTER Y WITH DIAERESIS */
+        tc = toupper_l ((unsigned char) '\377', locale);
+        ASSERT (tc == (unsigned char) '\377');
+      #endif
+
+        freelocale (locale);
+      }
+  }
+#endif
+
+  return test_exit_status;
+}
-- 
2.43.0

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