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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 2, 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,

   59 Temple Place, Suite 330, Boston, MA 02111 USA. */

#define READLINE_LIBRARY

#if defined (HAVE_CONFIG_H)

#  include <config.h>

#endif

#include <sys/types.h>

#include <stdio.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"

#include "readline.h"

#include "rlshell.h"

#include "rlprivate.h"

#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",

};

static char *normalize_codeset PARAMS((char *));

static char *find_codeset PARAMS((char *, size_t *));

#endif /* !HAVE_SETLOCALE */

static char *_rl_get_locale_var PARAMS((const char *));

static char *

_rl_get_locale_var (v)

     const char *v;

{

  char *lspec;

  lspec = sh_get_env_value ("LC_ALL");

  if (lspec == 0 || *lspec == 0)

    lspec = sh_get_env_value (v);

  if (lspec == 0 || *lspec == 0)

    lspec = sh_get_env_value ("LANG");

  return lspec;

}

/* 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 *lspec, *t;

  /* Set the LC_CTYPE locale category from environment variables. */

  lspec = _rl_get_locale_var ("LC_CTYPE");

  /* Since _rl_get_locale_var queries the right environment variables,

     we query the current locale settings with setlocale(), and, if

     that doesn't return anything, we set lspec to the empty string to

     force the subsequent call to setlocale() to define the `native'

     environment. */

  if (lspec == 0 || *lspec == 0)

    lspec = setlocale (LC_CTYPE, (char *)NULL);

  if (lspec == 0)

    lspec = "";

  t = setlocale (LC_CTYPE, lspec);

  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 = _rl_get_locale_var ("LC_CTYPE");

  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 ((unsigned char)codeset[i]))

        {

          len++;

          all_digits &= _rl_digit_p (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 ((unsigned char)codeset[i]))

      *wp++ = _rl_to_lower (codeset[i]);

    else if (_rl_digit_p (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 */