locale.c

   1 /* locale.c - Miscellaneous internationalization functions. */
   2
   3 /* Copyright (C) 1996 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software; you can redistribute it and/or modify it under
   8    the terms of the GNU General Public License as published by the Free
   9    Software Foundation; either version 2, or (at your option) any later
  10    version.
  11
  12    Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  13    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15    for more details.
  16
  17    You should have received a copy of the GNU General Public License along
  18    with Bash; see the file COPYING.  If not, write to the Free Software
  19    Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  20
  21 #include "config.h"
  22
  23 #include "bashtypes.h"
  24
  25 #if defined (HAVE_UNISTD_H)
  26 #  include <unistd.h>
  27 #endif
  28
  29 #include "bashintl.h"
  30 #include "bashansi.h"
  31 #include <stdio.h>
  32 #include <ctype.h>
  33
  34 #include "shell.h"
  35
  36 /* The current locale when the program begins */
  37 static char *default_locale;
  38
  39 /* The current domain for textdomain(3). */
  40 static char *default_domain;
  41 static char *default_dir;
  42
  43 /* tracks the value of LC_ALL; used to override values for other locale
  44    categories */
  45 static char *lc_all;
  46
  47 /* Set the value of default_locale and make the current locale the
  48    system default locale.  This should be called very early in main(). */
  49 void
  50 set_default_locale ()
  51 {
  52 #if defined (HAVE_SETLOCALE)
  53   default_locale = setlocale (LC_ALL, "");
  54   if (default_locale)
  55     default_locale = savestring (default_locale);
  56 #endif /* HAVE_SETLOCALE */
  57 }
  58
  59 /* Set default values for LC_CTYPE, LC_COLLATE, and LC_MESSAGES if they
  60    are not specified in the environment, but LANG or LC_ALL is.  This
  61    should be called from main() after parsing the environment. */
  62 void
  63 set_default_locale_vars ()
  64 {
  65   char *val;
  66
  67 #if defined (HAVE_SETLOCALE)
  68   val = get_string_value ("LC_CTYPE");
  69   if (val == 0 && lc_all && *lc_all)
  70     setlocale (LC_CTYPE, lc_all);
  71
  72 #  if defined (LC_COLLATE)
  73   val = get_string_value ("LC_COLLATE");
  74   if (val == 0 && lc_all && *lc_all)
  75     setlocale (LC_COLLATE, lc_all);
  76 #  endif /* LC_COLLATE */
  77
  78 #  if defined (LC_MESSAGES)
  79   val = get_string_value ("LC_MESSAGES");
  80   if (val == 0 && lc_all && *lc_all)
  81     setlocale (LC_MESSAGES, lc_all);
  82 #  endif /* LC_MESSAGES */
  83
  84 #endif /* HAVE_SETLOCALE */
  85
  86   val = get_string_value ("TEXTDOMAIN");
  87   if (val && *val)
  88     {
  89       FREE (default_domain);
  90       default_domain = savestring (val);
  91       textdomain (default_domain);
  92     }
  93
  94   val = get_string_value ("TEXTDOMAINDIR");
  95   if (val && *val)
  96     {
  97       FREE (default_dir);
  98       default_dir = savestring (val);
  99       bindtextdomain (default_domain, default_dir);
 100     }
 101 }
 102
 103 /* Set one of the locale categories (specified by VAR) to VALUE.  Returns 1
 104   if successful, 0 otherwise. */
 105 int
 106 set_locale_var (var, value)
 107      char *var, *value;
 108 {
 109   if (var[0] == 'T' && var[10] == 0)            /* TEXTDOMAIN */
 110     {
 111       FREE (default_domain);
 112       default_domain = value ? savestring (value) : (char *)NULL;
 113       textdomain (default_domain);
 114       return (1);
 115     }
 116   else if (var[0] == 'T')                       /* TEXTDOMAINDIR */
 117     {
 118       FREE (default_dir);
 119       default_dir = value ? savestring (value) : (char *)NULL;
 120       bindtextdomain (default_domain, default_dir);
 121       return (1);
 122     }
 123
 124   /* var[0] == 'L' && var[1] == 'C' && var[2] == '_' */
 125
 126   else if (var[3] == 'A')                       /* LC_ALL */
 127     {
 128       FREE (lc_all);
 129       if (value)
 130         lc_all = savestring (value);
 131       else if (default_locale)
 132         lc_all = savestring (default_locale);
 133       else
 134         {
 135           lc_all = xmalloc (1);
 136           lc_all[0] = '\0';
 137         }
 138 #if defined (HAVE_SETLOCALE)
 139       return (setlocale (LC_ALL, value) != 0);
 140 #else
 141       return (1);
 142 #endif
 143     }
 144
 145 #if defined (HAVE_SETLOCALE)
 146   else if (var[3] == 'C' && var[4] == 'T')      /* LC_CTYPE */
 147     {
 148       if (lc_all == 0 || *lc_all == '\0')
 149         return (setlocale (LC_CTYPE, value) != 0);
 150     }
 151   else if (var[3] == 'C' && var[4] == 'O')      /* LC_COLLATE */
 152     {
 153 #  if defined (LC_COLLATE)
 154       if (lc_all == 0 || *lc_all == '\0')
 155         return (setlocale (LC_COLLATE, value) != 0);
 156 #  endif /* LC_COLLATE */
 157     }
 158   else if (var[3] == 'M' && var[4] == 'E')      /* LC_MESSAGES */
 159     {
 160 #  if defined (LC_MESSAGES)
 161       if (lc_all == 0 || *lc_all == '\0')
 162         return (setlocale (LC_MESSAGES, value) != 0);
 163 #  endif /* LC_MESSAGES */
 164     }
 165 #endif /* HAVE_SETLOCALE */
 166
 167   return (0);
 168 }
 169
 170 #if 0
 171 /* Called when LANG is assigned a value.  Sets LC_ALL if that has not
 172    already been set. */
 173 #else
 174 /* This no longer does anything; we rely on the C library for correct
 175    behavior. */
 176 #endif
 177 int
 178 set_lang (var, value)
 179      char *var, *value;
 180 {
 181 #if 0
 182   return ((lc_all == 0) ? set_locale_var ("LC_ALL", value) : 0);
 183 #else
 184   return 0;
 185 #endif
 186 }
 187
 188 /* Get the value of one of the locale variables (LC_MESSAGES, LC_CTYPE) */
 189 char *
 190 get_locale_var (var)
 191      char *var;
 192 {
 193   char *locale;
 194
 195   locale = lc_all;
 196
 197   if (locale == 0)
 198     locale = get_string_value (var);
 199   if (locale == 0)
 200     locale = default_locale;
 201
 202   return (locale);
 203 }
 204
 205 /* Translate the contents of STRING, a $"..." quoted string, according
 206    to the current locale.  In the `C' or `POSIX' locale, or if gettext()
 207    is not available, the passed string is returned unchanged.  The
 208    length of the translated string is returned in LENP, if non-null. */
 209 char *
 210 localetrans (string, len, lenp)
 211      char *string;
 212      int len, *lenp;
 213 {
 214   char *locale, *t;
 215 #if defined (HAVE_GETTEXT)
 216   char *translated;
 217   int tlen;
 218 #endif
 219
 220   /* Don't try to translate null strings. */
 221   if (string == 0 || *string == 0)
 222     {
 223       if (lenp)
 224         *lenp = 0;
 225       return ((char *)NULL);
 226     }
 227
 228   t = xmalloc (len + 1);
 229
 230   locale = get_locale_var ("LC_MESSAGES");
 231
 232   /* If we don't have setlocale() or the current locale is `C' or `POSIX',
 233      just return the string.  If we don't have gettext(), there's no use
 234      doing anything else. */
 235 #if defined (HAVE_GETTEXT)
 236   if (locale == 0 || locale[0] == '\0' ||
 237       (locale[0] == 'C' && locale[1] == '\0') || STREQ (locale, "POSIX"))
 238 #endif
 239     {
 240       strcpy (t, string);
 241       if (lenp)
 242         *lenp = len;
 243       return (t);
 244     }
 245
 246 #if defined (HAVE_GETTEXT)
 247   /* Now try to translate it. */
 248   translated = gettext (string);
 249   if (translated == string)     /* gettext returns its argument if untranslatable */
 250     {
 251       strcpy (t, string);
 252       if (lenp)
 253         *lenp = len;
 254     }
 255   else
 256     {
 257       free (t);
 258       tlen = strlen (translated);
 259       t = xmalloc (tlen + 1);
 260       strcpy (t, translated);
 261       if (lenp)
 262         *lenp = tlen;
 263     }
 264   return (t);
 265 #endif /* HAVE_GETTEXT */
 266 }