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diff --git a/tests/basename-lgpl.h b/tests/basename-lgpl.h
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+/* Extract the last component (base name) of a file name.
+
+   Copyright (C) 1998, 2001, 2003-2006, 2009-2022 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/>.  */
+
+#ifndef _BASENAME_LGPL_H
+#define _BASENAME_LGPL_H
+
+#include <stddef.h>
+
+#ifndef DOUBLE_SLASH_IS_DISTINCT_ROOT
+# define DOUBLE_SLASH_IS_DISTINCT_ROOT 0
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Return the address of the last file name component of FILENAME.
+   If FILENAME has some trailing slash(es), they are considered to be
+   part of the last component.
+   If FILENAME has no relative file name components because it is a file
+   system root, return the empty string.
+   Examples:
+              FILENAME      RESULT
+              "foo.c"       "foo.c"
+              "foo/bar.c"   "bar.c"
+              "/foo/bar.c"  "bar.c"
+              "foo/bar/"    "bar/"
+              "foo/bar//"   "bar//"
+              "/"           ""
+              "//"          ""
+              ""            ""
+   The return value is a tail of the given FILENAME; do NOT free() it!  */
+
+/* This function was traditionally called 'basename', but we avoid this
+   function name because
+     * Various platforms have different functions in their libc.
+       In particular, the glibc basename(), defined in <string.h>, does
+       not consider trailing slashes to be part of the component:
+              FILENAME      RESULT
+              "foo/bar/"    ""
+              "foo/bar//"   ""
+     * The 'basename' command eliminates trailing slashes and for a root
+       produces a non-empty result:
+              FILENAME      RESULT
+              "foo/bar/"    "bar"
+              "foo/bar//"   "bar"
+              "/"           "/"
+              "//"          "/"
+ */
+extern char *last_component (char const *filename) _GL_ATTRIBUTE_PURE;
+
+/* Return the length of the basename FILENAME.
+   Typically FILENAME is the value returned by base_name or last_component.
+   Act like strlen (FILENAME), except omit all trailing slashes.  */
+extern size_t base_len (char const *filename) _GL_ATTRIBUTE_PURE;
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* _BASENAME_LGPL_H */