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diff --git a/readline/nls.c b/readline/nls.c
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+/* nls.c -- skeletal internationalization code. */
+
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+
+ This file is part of the GNU Readline Library, a library for
+ reading lines of text with interactive input and history editing.
+
+ The GNU Readline Library 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 1, or
+ (at your option) any later version.
+
+ The GNU Readline Library 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.
+
+ The GNU General Public License is often shipped with GNU software, and
+ is generally kept in a file called COPYING or LICENSE. If you do not
+ have a copy of the license, write to the Free Software Foundation,
+ 675 Mass Ave, Cambridge, MA 02139, USA. */
+#define READLINE_LIBRARY
+
+#if defined (HAVE_CONFIG_H)
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+
+#if defined (HAVE_STDLIB_H)
+# include <stdlib.h>
+#else
+# include "ansi_stdlib.h"
+#endif /* HAVE_STDLIB_H */
+
+#if defined (HAVE_LOCALE_H)
+# include <locale.h>
+#endif
+
+#include <ctype.h>
+
+#include "rldefs.h"
+
+extern int _rl_convert_meta_chars_to_ascii;
+extern int _rl_output_meta_chars;
+extern int _rl_meta_flag;
+
+/* Functions imported from shell.c */
+extern char *get_env_value ();
+
+#if !defined (HAVE_SETLOCALE)
+/* A list of legal values for the LANG or LC_CTYPE environment variables.
+ If a locale name in this list is the value for the LC_ALL, LC_CTYPE,
+ or LANG environment variable (using the first of those with a value),
+ readline eight-bit mode is enabled. */
+static char *legal_lang_values[] =
+{
+ "iso88591",
+ "iso88592",
+ "iso88593",
+ "iso88594",
+ "iso88595",
+ "iso88596",
+ "iso88597",
+ "iso88598",
+ "iso88599",
+ "iso885910",
+ "koi8r",
+ "koi8-r",
+ 0
+};
+
+static char *normalize_codeset ();
+static char *find_codeset ();
+#endif /* !HAVE_SETLOCALE */
+
+/* Check for LC_ALL, LC_CTYPE, and LANG and use the first with a value
+ to decide the defaults for 8-bit character input and output. Returns
+ 1 if we set eight-bit mode. */
+int
+_rl_init_eightbit ()
+{
+/* If we have setlocale(3), just check the current LC_CTYPE category
+ value, and go into eight-bit mode if it's not C or POSIX. */
+#if defined (HAVE_SETLOCALE)
+ char *t;
+
+ /* Set the LC_CTYPE locale category from environment variables. */
+ t = setlocale (LC_CTYPE, "");
+ if (t && *t && (t[0] != 'C' || t[1]) && (STREQ (t, "POSIX") == 0))
+ {
+ _rl_meta_flag = 1;
+ _rl_convert_meta_chars_to_ascii = 0;
+ _rl_output_meta_chars = 1;
+ return (1);
+ }
+ else
+ return (0);
+
+#else /* !HAVE_SETLOCALE */
+ char *lspec, *t;
+ int i;
+
+ /* We don't have setlocale. Finesse it. Check the environment for the
+ appropriate variables and set eight-bit mode if they have the right
+ values. */
+ lspec = get_env_value ("LC_ALL");
+ if (lspec == 0) lspec = get_env_value ("LC_CTYPE");
+ if (lspec == 0) lspec = get_env_value ("LANG");
+ if (lspec == 0 || (t = normalize_codeset (lspec)) == 0)
+ return (0);
+ for (i = 0; t && legal_lang_values[i]; i++)
+ if (STREQ (t, legal_lang_values[i]))
+ {
+ _rl_meta_flag = 1;
+ _rl_convert_meta_chars_to_ascii = 0;
+ _rl_output_meta_chars = 1;
+ break;
+ }
+ free (t);
+ return (legal_lang_values[i] ? 1 : 0);
+
+#endif /* !HAVE_SETLOCALE */
+}
+
+#if !defined (HAVE_SETLOCALE)
+static char *
+normalize_codeset (codeset)
+ char *codeset;
+{
+ size_t namelen, i;
+ int len, all_digits;
+ char *wp, *retval;
+
+ codeset = find_codeset (codeset, &namelen);
+
+ if (codeset == 0)
+ return (codeset);
+
+ all_digits = 1;
+ for (len = 0, i = 0; i < namelen; i++)
+ {
+ if (isalnum (codeset[i]))
+ {
+ len++;
+ all_digits &= isdigit (codeset[i]);
+ }
+ }
+
+ retval = (char *)malloc ((all_digits ? 3 : 0) + len + 1);
+ if (retval == 0)
+ return ((char *)0);
+
+ wp = retval;
+ /* Add `iso' to beginning of an all-digit codeset */
+ if (all_digits)
+ {
+ *wp++ = 'i';
+ *wp++ = 's';
+ *wp++ = 'o';
+ }
+
+ for (i = 0; i < namelen; i++)
+ if (isalpha (codeset[i]))
+ *wp++ = (isupper (codeset[i])) ? tolower (codeset[i]) : codeset[i];
+ else if (isdigit (codeset[i]))
+ *wp++ = codeset[i];
+ *wp = '\0';
+
+ return retval;
+}
+
+/* Isolate codeset portion of locale specification. */
+static char *
+find_codeset (name, lenp)
+ char *name;
+ size_t *lenp;
+{
+ char *cp, *language, *result;
+
+ cp = language = name;
+ result = (char *)0;
+
+ while (*cp && *cp != '_' && *cp != '@' && *cp != '+' && *cp != ',')
+ cp++;
+
+ /* This does not make sense: language has to be specified. As
+ an exception we allow the variable to contain only the codeset
+ name. Perhaps there are funny codeset names. */
+ if (language == cp)
+ {
+ *lenp = strlen (language);
+ result = language;
+ }
+ else
+ {
+ /* Next is the territory. */
+ if (*cp == '_')
+ do
+ ++cp;
+ while (*cp && *cp != '.' && *cp != '@' && *cp != '+' && *cp != ',' && *cp != '_');
+
+ /* Now, finally, is the codeset. */
+ result = cp;
+ if (*cp == '.')
+ do
+ ++cp;
+ while (*cp && *cp != '@');
+
+ if (cp - result > 2)
+ {
+ result++;
+ *lenp = cp - result;
+ }
+ else
+ {
+ *lenp = strlen (language);
+ result = language;
+ }
+ }
+
+ return result;
+}
+#endif /* !HAVE_SETLOCALE */