/* locale.c - Miscellaneous internationalization functions. */

/* Copyright (C) 1996-2009,2012 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash 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.

   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "config.h"

#include "bashtypes.h"

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif

#if HAVE_LANGINFO_CODESET
#  include <langinfo.h>
#endif

#include "bashintl.h"
#include "bashansi.h"
#include <stdio.h>
#include "chartypes.h"
#include <errno.h>

#include "shell.h"
#include "input.h"	/* For bash_input */

#ifndef errno
extern int errno;
#endif

int locale_utf8locale;	/* unused for now */
int locale_mb_cur_max;	/* value of MB_CUR_MAX for current locale (LC_CTYPE) */

extern int dump_translatable_strings, dump_po_strings;

/* The current locale when the program begins */
static char *default_locale;

/* The current domain for textdomain(3). */
static char *default_domain;
static char *default_dir;

/* tracks the value of LC_ALL; used to override values for other locale
   categories */
static char *lc_all;

/* tracks the value of LC_ALL; used to provide defaults for locale
   categories */
static char *lang;

/* Called to reset all of the locale variables to their appropriate values
   if (and only if) LC_ALL has not been assigned a value. */
static int reset_locale_vars __P((void));

static void locale_setblanks __P((void));
static int locale_isutf8 __P((char *));

/* Set the value of default_locale and make the current locale the
   system default locale.  This should be called very early in main(). */
void
set_default_locale ()
{
#if defined (HAVE_SETLOCALE)
  default_locale = setlocale (LC_ALL, "");
  if (default_locale)
    default_locale = savestring (default_locale);
#endif /* HAVE_SETLOCALE */
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  locale_mb_cur_max = MB_CUR_MAX;
}

/* Set default values for LC_CTYPE, LC_COLLATE, LC_MESSAGES, LC_NUMERIC and
   LC_TIME if they are not specified in the environment, but LC_ALL is.  This
   should be called from main() after parsing the environment. */
void
set_default_locale_vars ()
{
  char *val;

#if defined (HAVE_SETLOCALE)

#  if defined (LC_CTYPE)
  val = get_string_value ("LC_CTYPE");
  if (val == 0 && lc_all && *lc_all)
    {
      setlocale (LC_CTYPE, lc_all);
      locale_setblanks ();
      locale_mb_cur_max = MB_CUR_MAX;
      u32reset ();
    }
#  endif

#  if defined (LC_COLLATE)
  val = get_string_value ("LC_COLLATE");
  if (val == 0 && lc_all && *lc_all)
    setlocale (LC_COLLATE, lc_all);
#  endif /* LC_COLLATE */

#  if defined (LC_MESSAGES)
  val = get_string_value ("LC_MESSAGES");
  if (val == 0 && lc_all && *lc_all)
    setlocale (LC_MESSAGES, lc_all);
#  endif /* LC_MESSAGES */

#  if defined (LC_NUMERIC)
  val = get_string_value ("LC_NUMERIC");
  if (val == 0 && lc_all && *lc_all)
    setlocale (LC_NUMERIC, lc_all);
#  endif /* LC_NUMERIC */

#  if defined (LC_TIME)
  val = get_string_value ("LC_TIME");
  if (val == 0 && lc_all && *lc_all)
    setlocale (LC_TIME, lc_all);
#  endif /* LC_TIME */

#endif /* HAVE_SETLOCALE */

  val = get_string_value ("TEXTDOMAIN");
  if (val && *val)
    {
      FREE (default_domain);
      default_domain = savestring (val);
      if (default_dir && *default_dir)
	bindtextdomain (default_domain, default_dir);
    }

  val = get_string_value ("TEXTDOMAINDIR");
  if (val && *val)
    {
      FREE (default_dir);
      default_dir = savestring (val);
      if (default_domain && *default_domain)
	bindtextdomain (default_domain, default_dir);
    }
}

/* Set one of the locale categories (specified by VAR) to VALUE.  Returns 1
  if successful, 0 otherwise. */
int
set_locale_var (var, value)
     char *var, *value;
{
  int r;
  char *x;

  x = "";
  errno = 0;
  if (var[0] == 'T' && var[10] == 0)		/* TEXTDOMAIN */
    {
      FREE (default_domain);
      default_domain = value ? savestring (value) : (char *)NULL;
      if (default_dir && *default_dir)
	bindtextdomain (default_domain, default_dir);
      return (1);
    }
  else if (var[0] == 'T')			/* TEXTDOMAINDIR */
    {
      FREE (default_dir);
      default_dir = value ? savestring (value) : (char *)NULL;
      if (default_domain && *default_domain)
	bindtextdomain (default_domain, default_dir);
      return (1);
    }

  /* var[0] == 'L' && var[1] == 'C' && var[2] == '_' */

  else if (var[3] == 'A')			/* LC_ALL */
    {
      FREE (lc_all);
      if (value)
	lc_all = savestring (value);
      else
	{
	  lc_all = (char *)xmalloc (1);
	  lc_all[0] = '\0';
	}
#if defined (HAVE_SETLOCALE)
      r = *lc_all ? ((x = setlocale (LC_ALL, lc_all)) != 0) : reset_locale_vars ();
      if (x == 0)
	{
	  if (errno == 0)
	    internal_warning(_("setlocale: LC_ALL: cannot change locale (%s)"), lc_all);
	  else
	    internal_warning(_("setlocale: LC_ALL: cannot change locale (%s): %s"), lc_all, strerror (errno));
	}
      locale_setblanks ();
      locale_mb_cur_max = MB_CUR_MAX;
      u32reset ();
      return r;
#else
      return (1);
#endif
    }

#if defined (HAVE_SETLOCALE)
  else if (var[3] == 'C' && var[4] == 'T')	/* LC_CTYPE */
    {
#  if defined (LC_CTYPE)
      if (lc_all == 0 || *lc_all == '\0')
	{
	  x = setlocale (LC_CTYPE, get_locale_var ("LC_CTYPE"));
	  locale_setblanks ();
	  locale_mb_cur_max = MB_CUR_MAX;
	  u32reset ();
	}
#  endif
    }
  else if (var[3] == 'C' && var[4] == 'O')	/* LC_COLLATE */
    {
#  if defined (LC_COLLATE)
      if (lc_all == 0 || *lc_all == '\0')
	x = setlocale (LC_COLLATE, get_locale_var ("LC_COLLATE"));
#  endif /* LC_COLLATE */
    }
  else if (var[3] == 'M' && var[4] == 'E')	/* LC_MESSAGES */
    {
#  if defined (LC_MESSAGES)
      if (lc_all == 0 || *lc_all == '\0')
	x = setlocale (LC_MESSAGES, get_locale_var ("LC_MESSAGES"));
#  endif /* LC_MESSAGES */
    }
  else if (var[3] == 'N' && var[4] == 'U')	/* LC_NUMERIC */
    {
#  if defined (LC_NUMERIC)
      if (lc_all == 0 || *lc_all == '\0')
	x = setlocale (LC_NUMERIC, get_locale_var ("LC_NUMERIC"));
#  endif /* LC_NUMERIC */
    }
  else if (var[3] == 'T' && var[4] == 'I')	/* LC_TIME */
    {
#  if defined (LC_TIME)
      if (lc_all == 0 || *lc_all == '\0')
	x = setlocale (LC_TIME, get_locale_var ("LC_TIME"));
#  endif /* LC_TIME */
    }
#endif /* HAVE_SETLOCALE */
  
  if (x == 0)
    {
      if (errno == 0)
	internal_warning(_("setlocale: %s: cannot change locale (%s)"), var, get_locale_var (var));
      else
	internal_warning(_("setlocale: %s: cannot change locale (%s): %s"), var, get_locale_var (var), strerror (errno));
    }

  return (x != 0);
}

/* Called when LANG is assigned a value.  Tracks value in `lang'.  Calls
   reset_locale_vars() to reset any default values if LC_ALL is unset or
   null. */
int
set_lang (var, value)
     char *var, *value;
{
  FREE (lang);
  if (value)
    lang = savestring (value);
  else
    {
      lang = (char *)xmalloc (1);
      lang[0] = '\0';
    }

  return ((lc_all == 0 || *lc_all == 0) ? reset_locale_vars () : 0);
}

/* Set default values for LANG and LC_ALL.  Default values for all other
   locale-related variables depend on these. */
void
set_default_lang ()
{
  char *v;

  v = get_string_value ("LC_ALL");
  set_locale_var ("LC_ALL", v);

  v = get_string_value ("LANG");
  set_lang ("LANG", v);
}

/* Get the value of one of the locale variables (LC_MESSAGES, LC_CTYPE).
   The precedence is as POSIX.2 specifies:  LC_ALL has precedence over
   the specific locale variables, and LANG, if set, is used as the default. */
char *
get_locale_var (var)
     char *var;
{
  char *locale;

  locale = lc_all;

  if (locale == 0 || *locale == 0)
    locale = get_string_value (var);	/* XXX - mem leak? */
  if (locale == 0 || *locale == 0)
    locale = lang;
  if (locale == 0 || *locale == 0)
#if 0
    locale = default_locale;	/* system-dependent; not really portable.  should it be "C"? */
#else
    locale = "";
#endif
  return (locale);
}

/* Called to reset all of the locale variables to their appropriate values
   if (and only if) LC_ALL has not been assigned a value.  DO NOT CALL THIS
   IF LC_ALL HAS BEEN ASSIGNED A VALUE. */
static int
reset_locale_vars ()
{
  char *t;
#if defined (HAVE_SETLOCALE)
  if (lang == 0 || *lang == '\0')
    maybe_make_export_env ();		/* trust that this will change environment for setlocale */
  if (setlocale (LC_ALL, lang ? lang : "") == 0)
    return 0;

#  if defined (LC_CTYPE)
  t = setlocale (LC_CTYPE, get_locale_var ("LC_CTYPE"));
#  endif
#  if defined (LC_COLLATE)
  t = setlocale (LC_COLLATE, get_locale_var ("LC_COLLATE"));
#  endif
#  if defined (LC_MESSAGES)
  t = setlocale (LC_MESSAGES, get_locale_var ("LC_MESSAGES"));
#  endif
#  if defined (LC_NUMERIC)
  t = setlocale (LC_NUMERIC, get_locale_var ("LC_NUMERIC"));
#  endif
#  if defined (LC_TIME)
  t = setlocale (LC_TIME, get_locale_var ("LC_TIME"));
#  endif

  locale_setblanks ();  
  locale_mb_cur_max = MB_CUR_MAX;
  u32reset ();

#endif
  return 1;
}

/* Translate the contents of STRING, a $"..." quoted string, according
   to the current locale.  In the `C' or `POSIX' locale, or if gettext()
   is not available, the passed string is returned unchanged.  The
   length of the translated string is returned in LENP, if non-null. */
char *
localetrans (string, len, lenp)
     char *string;
     int len, *lenp;
{
  char *locale, *t;
  char *translated;
  int tlen;

  /* Don't try to translate null strings. */
  if (string == 0 || *string == 0)
    {
      if (lenp)
	*lenp = 0;
      return ((char *)NULL);
    }

  locale = get_locale_var ("LC_MESSAGES");

  /* If we don't have setlocale() or the current locale is `C' or `POSIX',
     just return the string.  If we don't have gettext(), there's no use
     doing anything else. */
  if (locale == 0 || locale[0] == '\0' ||
      (locale[0] == 'C' && locale[1] == '\0') || STREQ (locale, "POSIX"))
    {
      t = (char *)xmalloc (len + 1);
      strcpy (t, string);
      if (lenp)
	*lenp = len;
      return (t);
    }

  /* Now try to translate it. */
  if (default_domain && *default_domain)
    translated = dgettext (default_domain, string);
  else
    translated = string;

  if (translated == string)	/* gettext returns its argument if untranslatable */
    {
      t = (char *)xmalloc (len + 1);
      strcpy (t, string);
      if (lenp)
	*lenp = len;
    }
  else
    {
      tlen = strlen (translated);
      t = (char *)xmalloc (tlen + 1);
      strcpy (t, translated);
      if (lenp)
	*lenp = tlen;
    }
  return (t);
}

/* Change a bash string into a string suitable for inclusion in a `po' file.
   This backslash-escapes `"' and `\' and changes newlines into \\\n"\n". */
char *
mk_msgstr (string, foundnlp)
     char *string;
     int *foundnlp;
{
  register int c, len;
  char *result, *r, *s;

  for (len = 0, s = string; s && *s; s++)
    {
      len++;
      if (*s == '"' || *s == '\\')
	len++;
      else if (*s == '\n')
	len += 5;
    }
  
  r = result = (char *)xmalloc (len + 3);
  *r++ = '"';

  for (s = string; s && (c = *s); s++)
    {
      if (c == '\n')	/* <NL> -> \n"<NL>" */
	{
	  *r++ = '\\';
	  *r++ = 'n';
	  *r++ = '"';
	  *r++ = '\n';
	  *r++ = '"';
	  if (foundnlp)
	    *foundnlp = 1;
	  continue;
	}
      if (c == '"' || c == '\\')
	*r++ = '\\';
      *r++ = c;
    }

  *r++ = '"';
  *r++ = '\0';

  return result;
}

/* $"..." -- Translate the portion of STRING between START and END
   according to current locale using gettext (if available) and return
   the result.  The caller will take care of leaving the quotes intact.
   The string will be left without the leading `$' by the caller.
   If translation is performed, the translated string will be double-quoted
   by the caller.  The length of the translated string is returned in LENP,
   if non-null. */
char *
localeexpand (string, start, end, lineno, lenp)
     char *string;
     int start, end, lineno, *lenp;
{
  int len, tlen, foundnl;
  char *temp, *t, *t2;

  temp = (char *)xmalloc (end - start + 1);
  for (tlen = 0, len = start; len < end; )
    temp[tlen++] = string[len++];
  temp[tlen] = '\0';

  /* If we're just dumping translatable strings, don't do anything with the
     string itself, but if we're dumping in `po' file format, convert it into
     a form more palatable to gettext(3) and friends by quoting `"' and `\'
     with backslashes and converting <NL> into `\n"<NL>"'.  If we find a
     newline in TEMP, we first output a `msgid ""' line and then the
     translated string; otherwise we output the `msgid' and translated
     string all on one line. */
  if (dump_translatable_strings)
    {
      if (dump_po_strings)
	{
	  foundnl = 0;
	  t = mk_msgstr (temp, &foundnl);
	  t2 = foundnl ? "\"\"\n" : "";

	  printf ("#: %s:%d\nmsgid %s%s\nmsgstr \"\"\n",
			yy_input_name (), lineno, t2, t);
	  free (t);
	}
      else
	printf ("\"%s\"\n", temp);

      if (lenp)
	*lenp = tlen;
      return (temp);
    }
  else if (*temp)
    {
      t = localetrans (temp, tlen, &len);
      free (temp);
      if (lenp)
	*lenp = len;
      return (t);
    }
  else
    {
      if (lenp)
	*lenp = 0;
      return (temp);
    }
}

/* Set every character in the <blank> character class to be a shell break
   character for the lexical analyzer when the locale changes. */
static void
locale_setblanks ()
{
  int x;

  for (x = 0; x < sh_syntabsiz; x++)
    {
      if (isblank (x))
	sh_syntaxtab[x] |= CSHBRK|CBLANK;
      else if (member (x, shell_break_chars))
	{
	  sh_syntaxtab[x] |= CSHBRK;
	  sh_syntaxtab[x] &= ~CBLANK;
	}
      else
	sh_syntaxtab[x] &= ~(CSHBRK|CBLANK);
    }
}

static int
locale_isutf8 (lspec)
     char *lspec;
{
  char *cp;

#if HAVE_LANGINFO_CODESET
  cp = nl_langinfo (CODESET);
  return (STREQ (cp, "UTF-8") || STREQ (cp, "utf8"));
#else
  /* Take a shot */
  return (strstr (lspec, "UTF-8") || strstr (lspec, "utf8"));
#endif
}