* lib/basename.c, lib/dirname.h, lib/dirname.c, lib/memrchr.c,

* lib/xstrndup.c, lib/strchr.c:
New, stolen from the Fileutils 4.1.
* lib/Makefile.am (libbison_a_SOURCES): Adjust.
* configure.in: Check for the presence of memrchr, strchr,
strnlen, and of their prototypes.
Don't check for strndup: we no longer use it.
* src/system.h: Adjust the prototypes.

lib/xstrndup.c

@@ -0,0 +1,51 @@
+/* Copyright (C) 2001 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 2, 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, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#if STDC_HEADERS || HAVE_STRING_H
+# include <string.h>
+#else
+# include <strings.h>
+#endif
+
+#include <sys/types.h>
+
+#include "xalloc.h"
+
+#ifndef HAVE_DECL_STRNLEN
+"this configure-time declaration test was not run"
+#endif
+#if !HAVE_DECL_STRNLEN
+size_t strnlen ();
+#endif
+
+char *xstrndup (const char *s, size_t n);
+
+char *
+xstrndup (const char *s, size_t n)
+{
+  size_t len = strnlen (s, n);
+  char *new = xmalloc (len + 1);
+
+  if (new == NULL)
+    return NULL;
+
+  new[len] = '\0';
+  return (char *) memcpy (new, s, len);
+}