locale.c

   1 /* locale.c - Miscellaneous internationalization functions. */
   2
   3 /* Copyright (C) 1996-2009 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
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    Bash is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  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 "chartypes.h"
  33 #include <errno.h>
  34
  35 #include "shell.h"
  36 #include "input.h"      /* For bash_input */
  37
  38 #ifndef errno
  39 extern int errno;
  40 #endif
  41
  42 extern int dump_translatable_strings, dump_po_strings;
  43
  44 /* The current locale when the program begins */
  45 static char *default_locale;
  46
  47 /* The current domain for textdomain(3). */
  48 static char *default_domain;
  49 static char *default_dir;
  50
  51 /* tracks the value of LC_ALL; used to override values for other locale
  52    categories */
  53 static char *lc_all;
  54
  55 /* tracks the value of LC_ALL; used to provide defaults for locale
  56    categories */
  57 static char *lang;
  58
  59 /* Called to reset all of the locale variables to their appropriate values
  60    if (and only if) LC_ALL has not been assigned a value. */
  61 static int reset_locale_vars __P((void));
  62
  63 static void locale_setblanks __P((void));
  64
  65 /* Set the value of default_locale and make the current locale the
  66    system default locale.  This should be called very early in main(). */
  67 void
  68 set_default_locale ()
  69 {
  70 #if defined (HAVE_SETLOCALE)
  71   default_locale = setlocale (LC_ALL, "");
  72   if (default_locale)
  73     default_locale = savestring (default_locale);
  74 #endif /* HAVE_SETLOCALE */
  75   bindtextdomain (PACKAGE, LOCALEDIR);
  76   textdomain (PACKAGE);
  77 }
  78
  79 /* Set default values for LC_CTYPE, LC_COLLATE, LC_MESSAGES, LC_NUMERIC and
  80    LC_TIME if they are not specified in the environment, but LC_ALL is.  This
  81    should be called from main() after parsing the environment. */
  82 void
  83 set_default_locale_vars ()
  84 {
  85   char *val;
  86
  87 #if defined (HAVE_SETLOCALE)
  88
  89 #  if defined (LC_CTYPE)
  90   val = get_string_value ("LC_CTYPE");
  91   if (val == 0 && lc_all && *lc_all)
  92     {
  93       setlocale (LC_CTYPE, lc_all);
  94       locale_setblanks ();
  95     }
  96 #  endif
  97
  98 #  if defined (LC_COLLATE)
  99   val = get_string_value ("LC_COLLATE");
 100   if (val == 0 && lc_all && *lc_all)
 101     setlocale (LC_COLLATE, lc_all);
 102 #  endif /* LC_COLLATE */
 103
 104 #  if defined (LC_MESSAGES)
 105   val = get_string_value ("LC_MESSAGES");
 106   if (val == 0 && lc_all && *lc_all)
 107     setlocale (LC_MESSAGES, lc_all);
 108 #  endif /* LC_MESSAGES */
 109
 110 #  if defined (LC_NUMERIC)
 111   val = get_string_value ("LC_NUMERIC");
 112   if (val == 0 && lc_all && *lc_all)
 113     setlocale (LC_NUMERIC, lc_all);
 114 #  endif /* LC_NUMERIC */
 115
 116 #  if defined (LC_TIME)
 117   val = get_string_value ("LC_TIME");
 118   if (val == 0 && lc_all && *lc_all)
 119     setlocale (LC_TIME, lc_all);
 120 #  endif /* LC_TIME */
 121
 122 #endif /* HAVE_SETLOCALE */
 123
 124   val = get_string_value ("TEXTDOMAIN");
 125   if (val && *val)
 126     {
 127       FREE (default_domain);
 128       default_domain = savestring (val);
 129 #if 0
 130       /* Don't want to override the shell's textdomain as the default */
 131       textdomain (default_domain);
 132 #endif
 133     }
 134
 135   val = get_string_value ("TEXTDOMAINDIR");
 136   if (val && *val)
 137     {
 138       FREE (default_dir);
 139       default_dir = savestring (val);
 140       if (default_domain && *default_domain)
 141         bindtextdomain (default_domain, default_dir);
 142     }
 143 }
 144
 145 /* Set one of the locale categories (specified by VAR) to VALUE.  Returns 1
 146   if successful, 0 otherwise. */
 147 int
 148 set_locale_var (var, value)
 149      char *var, *value;
 150 {
 151   int r;
 152   char *x;
 153
 154   x = "";
 155   errno = 0;
 156   if (var[0] == 'T' && var[10] == 0)            /* TEXTDOMAIN */
 157     {
 158       FREE (default_domain);
 159       default_domain = value ? savestring (value) : (char *)NULL;
 160 #if 0
 161       /* Don't want to override the shell's textdomain as the default */
 162       textdomain (default_domain);
 163 #endif
 164       return (1);
 165     }
 166   else if (var[0] == 'T')                       /* TEXTDOMAINDIR */
 167     {
 168       FREE (default_dir);
 169       default_dir = value ? savestring (value) : (char *)NULL;
 170       if (default_domain && *default_domain)
 171         bindtextdomain (default_domain, default_dir);
 172       return (1);
 173     }
 174
 175   /* var[0] == 'L' && var[1] == 'C' && var[2] == '_' */
 176
 177   else if (var[3] == 'A')                       /* LC_ALL */
 178     {
 179       FREE (lc_all);
 180       if (value)
 181         lc_all = savestring (value);
 182       else
 183         {
 184           lc_all = (char *)xmalloc (1);
 185           lc_all[0] = '\0';
 186         }
 187 #if defined (HAVE_SETLOCALE)
 188       r = *lc_all ? ((x = setlocale (LC_ALL, lc_all)) != 0) : reset_locale_vars ();
 189       if (x == 0)
 190         {
 191           if (errno == 0)
 192             internal_warning(_("setlocale: LC_ALL: cannot change locale (%s)"), lc_all);
 193           else
 194             internal_warning(_("setlocale: LC_ALL: cannot change locale (%s): %s"), lc_all, strerror (errno));
 195         }
 196       locale_setblanks ();
 197       return r;
 198 #else
 199       return (1);
 200 #endif
 201     }
 202
 203 #if defined (HAVE_SETLOCALE)
 204   else if (var[3] == 'C' && var[4] == 'T')      /* LC_CTYPE */
 205     {
 206 #  if defined (LC_CTYPE)
 207       if (lc_all == 0 || *lc_all == '\0')
 208         {
 209           x = setlocale (LC_CTYPE, get_locale_var ("LC_CTYPE"));
 210           locale_setblanks ();
 211         }
 212 #  endif
 213     }
 214   else if (var[3] == 'C' && var[4] == 'O')      /* LC_COLLATE */
 215     {
 216 #  if defined (LC_COLLATE)
 217       if (lc_all == 0 || *lc_all == '\0')
 218         x = setlocale (LC_COLLATE, get_locale_var ("LC_COLLATE"));
 219 #  endif /* LC_COLLATE */
 220     }
 221   else if (var[3] == 'M' && var[4] == 'E')      /* LC_MESSAGES */
 222     {
 223 #  if defined (LC_MESSAGES)
 224       if (lc_all == 0 || *lc_all == '\0')
 225         x = setlocale (LC_MESSAGES, get_locale_var ("LC_MESSAGES"));
 226 #  endif /* LC_MESSAGES */
 227     }
 228   else if (var[3] == 'N' && var[4] == 'U')      /* LC_NUMERIC */
 229     {
 230 #  if defined (LC_NUMERIC)
 231       if (lc_all == 0 || *lc_all == '\0')
 232         x = setlocale (LC_NUMERIC, get_locale_var ("LC_NUMERIC"));
 233 #  endif /* LC_NUMERIC */
 234     }
 235   else if (var[3] == 'T' && var[4] == 'I')      /* LC_TIME */
 236     {
 237 #  if defined (LC_TIME)
 238       if (lc_all == 0 || *lc_all == '\0')
 239         x = setlocale (LC_TIME, get_locale_var ("LC_TIME"));
 240 #  endif /* LC_TIME */
 241     }
 242 #endif /* HAVE_SETLOCALE */
 243
 244   if (x == 0)
 245     {
 246       if (errno == 0)
 247         internal_warning(_("setlocale: %s: cannot change locale (%s)"), var, get_locale_var (var));
 248       else
 249         internal_warning(_("setlocale: %s: cannot change locale (%s): %s"), var, get_locale_var (var), strerror (errno));
 250     }
 251
 252   return (x != 0);
 253 }
 254
 255 /* Called when LANG is assigned a value.  Tracks value in `lang'.  Calls
 256    reset_locale_vars() to reset any default values if LC_ALL is unset or
 257    null. */
 258 int
 259 set_lang (var, value)
 260      char *var, *value;
 261 {
 262   FREE (lang);
 263   if (value)
 264     lang = savestring (value);
 265   else
 266     {
 267       lang = (char *)xmalloc (1);
 268       lang[0] = '\0';
 269     }
 270
 271   return ((lc_all == 0 || *lc_all == 0) ? reset_locale_vars () : 0);
 272 }
 273
 274 /* Set default values for LANG and LC_ALL.  Default values for all other
 275    locale-related variables depend on these. */
 276 void
 277 set_default_lang ()
 278 {
 279   char *v;
 280
 281   v = get_string_value ("LC_ALL");
 282   set_locale_var ("LC_ALL", v);
 283
 284   v = get_string_value ("LANG");
 285   set_lang ("LANG", v);
 286 }
 287
 288 /* Get the value of one of the locale variables (LC_MESSAGES, LC_CTYPE).
 289    The precedence is as POSIX.2 specifies:  LC_ALL has precedence over
 290    the specific locale variables, and LANG, if set, is used as the default. */
 291 char *
 292 get_locale_var (var)
 293      char *var;
 294 {
 295   char *locale;
 296
 297   locale = lc_all;
 298
 299   if (locale == 0 || *locale == 0)
 300     locale = get_string_value (var);
 301   if (locale == 0 || *locale == 0)
 302     locale = lang;
 303   if (locale == 0 || *locale == 0)
 304 #if 0
 305     locale = default_locale;    /* system-dependent; not really portable.  should it be "C"? */
 306 #else
 307     locale = "";
 308 #endif
 309   return (locale);
 310 }
 311
 312 /* Called to reset all of the locale variables to their appropriate values
 313    if (and only if) LC_ALL has not been assigned a value.  DO NOT CALL THIS
 314    IF LC_ALL HAS BEEN ASSIGNED A VALUE. */
 315 static int
 316 reset_locale_vars ()
 317 {
 318   char *t;
 319 #if defined (HAVE_SETLOCALE)
 320   if (lang == 0 || *lang == '\0')
 321     maybe_make_export_env ();           /* trust that this will change environment for setlocale */
 322   if (setlocale (LC_ALL, lang ? lang : "") == 0)
 323     return 0;
 324
 325 #  if defined (LC_CTYPE)
 326   t = setlocale (LC_CTYPE, get_locale_var ("LC_CTYPE"));
 327 #  endif
 328 #  if defined (LC_COLLATE)
 329   t = setlocale (LC_COLLATE, get_locale_var ("LC_COLLATE"));
 330 #  endif
 331 #  if defined (LC_MESSAGES)
 332   t = setlocale (LC_MESSAGES, get_locale_var ("LC_MESSAGES"));
 333 #  endif
 334 #  if defined (LC_NUMERIC)
 335   t = setlocale (LC_NUMERIC, get_locale_var ("LC_NUMERIC"));
 336 #  endif
 337 #  if defined (LC_TIME)
 338   t = setlocale (LC_TIME, get_locale_var ("LC_TIME"));
 339 #  endif
 340
 341   locale_setblanks ();
 342
 343 #endif
 344   return 1;
 345 }
 346
 347 /* Translate the contents of STRING, a $"..." quoted string, according
 348    to the current locale.  In the `C' or `POSIX' locale, or if gettext()
 349    is not available, the passed string is returned unchanged.  The
 350    length of the translated string is returned in LENP, if non-null. */
 351 char *
 352 localetrans (string, len, lenp)
 353      char *string;
 354      int len, *lenp;
 355 {
 356   char *locale, *t;
 357   char *translated;
 358   int tlen;
 359
 360   /* Don't try to translate null strings. */
 361   if (string == 0 || *string == 0)
 362     {
 363       if (lenp)
 364         *lenp = 0;
 365       return ((char *)NULL);
 366     }
 367
 368   locale = get_locale_var ("LC_MESSAGES");
 369
 370   /* If we don't have setlocale() or the current locale is `C' or `POSIX',
 371      just return the string.  If we don't have gettext(), there's no use
 372      doing anything else. */
 373   if (locale == 0 || locale[0] == '\0' ||
 374       (locale[0] == 'C' && locale[1] == '\0') || STREQ (locale, "POSIX"))
 375     {
 376       t = (char *)xmalloc (len + 1);
 377       strcpy (t, string);
 378       if (lenp)
 379         *lenp = len;
 380       return (t);
 381     }
 382
 383   /* Now try to translate it. */
 384   if (default_domain && *default_domain)
 385     translated = dgettext (default_domain, string);
 386   else
 387     translated = string;
 388
 389   if (translated == string)     /* gettext returns its argument if untranslatable */
 390     {
 391       t = (char *)xmalloc (len + 1);
 392       strcpy (t, string);
 393       if (lenp)
 394         *lenp = len;
 395     }
 396   else
 397     {
 398       tlen = strlen (translated);
 399       t = (char *)xmalloc (tlen + 1);
 400       strcpy (t, translated);
 401       if (lenp)
 402         *lenp = tlen;
 403     }
 404   return (t);
 405 }
 406
 407 /* Change a bash string into a string suitable for inclusion in a `po' file.
 408    This backslash-escapes `"' and `\' and changes newlines into \\\n"\n". */
 409 char *
 410 mk_msgstr (string, foundnlp)
 411      char *string;
 412      int *foundnlp;
 413 {
 414   register int c, len;
 415   char *result, *r, *s;
 416
 417   for (len = 0, s = string; s && *s; s++)
 418     {
 419       len++;
 420       if (*s == '"' || *s == '\\')
 421         len++;
 422       else if (*s == '\n')
 423         len += 5;
 424     }
 425
 426   r = result = (char *)xmalloc (len + 3);
 427   *r++ = '"';
 428
 429   for (s = string; s && (c = *s); s++)
 430     {
 431       if (c == '\n')    /* <NL> -> \n"<NL>" */
 432         {
 433           *r++ = '\\';
 434           *r++ = 'n';
 435           *r++ = '"';
 436           *r++ = '\n';
 437           *r++ = '"';
 438           if (foundnlp)
 439             *foundnlp = 1;
 440           continue;
 441         }
 442       if (c == '"' || c == '\\')
 443         *r++ = '\\';
 444       *r++ = c;
 445     }
 446
 447   *r++ = '"';
 448   *r++ = '\0';
 449
 450   return result;
 451 }
 452
 453 /* $"..." -- Translate the portion of STRING between START and END
 454    according to current locale using gettext (if available) and return
 455    the result.  The caller will take care of leaving the quotes intact.
 456    The string will be left without the leading `$' by the caller.
 457    If translation is performed, the translated string will be double-quoted
 458    by the caller.  The length of the translated string is returned in LENP,
 459    if non-null. */
 460 char *
 461 localeexpand (string, start, end, lineno, lenp)
 462      char *string;
 463      int start, end, lineno, *lenp;
 464 {
 465   int len, tlen, foundnl;
 466   char *temp, *t, *t2;
 467
 468   temp = (char *)xmalloc (end - start + 1);
 469   for (tlen = 0, len = start; len < end; )
 470     temp[tlen++] = string[len++];
 471   temp[tlen] = '\0';
 472
 473   /* If we're just dumping translatable strings, don't do anything with the
 474      string itself, but if we're dumping in `po' file format, convert it into
 475      a form more palatable to gettext(3) and friends by quoting `"' and `\'
 476      with backslashes and converting <NL> into `\n"<NL>"'.  If we find a
 477      newline in TEMP, we first output a `msgid ""' line and then the
 478      translated string; otherwise we output the `msgid' and translated
 479      string all on one line. */
 480   if (dump_translatable_strings)
 481     {
 482       if (dump_po_strings)
 483         {
 484           foundnl = 0;
 485           t = mk_msgstr (temp, &foundnl);
 486           t2 = foundnl ? "\"\"\n" : "";
 487
 488           printf ("#: %s:%d\nmsgid %s%s\nmsgstr \"\"\n",
 489                         yy_input_name (), lineno, t2, t);
 490           free (t);
 491         }
 492       else
 493         printf ("\"%s\"\n", temp);
 494
 495       if (lenp)
 496         *lenp = tlen;
 497       return (temp);
 498     }
 499   else if (*temp)
 500     {
 501       t = localetrans (temp, tlen, &len);
 502       free (temp);
 503       if (lenp)
 504         *lenp = len;
 505       return (t);
 506     }
 507   else
 508     {
 509       if (lenp)
 510         *lenp = 0;
 511       return (temp);
 512     }
 513 }
 514
 515 /* Set every character in the <blank> character class to be a shell break
 516    character for the lexical analyzer when the locale changes. */
 517 static void
 518 locale_setblanks ()
 519 {
 520   int x;
 521
 522   for (x = 0; x < sh_syntabsiz; x++)
 523     {
 524       if (isblank (x))
 525         sh_syntaxtab[x] |= CSHBRK|CBLANK;
 526       else if (member (x, shell_break_chars))
 527         {
 528           sh_syntaxtab[x] |= CSHBRK;
 529           sh_syntaxtab[x] &= ~CBLANK;
 530         }
 531       else
 532         sh_syntaxtab[x] &= ~(CSHBRK|CBLANK);
 533     }
 534 }