intl/bindtextdom.c

   1 /* Implementation of the bindtextdomain(3) function
   2    Copyright (C) 1995-1998, 2000, 2001, 2002, 2005 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include <stddef.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #ifdef _LIBC
  29 # include <libintl.h>
  30 #else
  31 # include "libgnuintl.h"
  32 #endif
  33 #include "gettextP.h"
  34
  35 #ifdef _LIBC
  36 /* We have to handle multi-threaded applications.  */
  37 # include <bits/libc-lock.h>
  38 #else
  39 /* Provide dummy implementation if this is outside glibc.  */
  40 # define __libc_rwlock_define(CLASS, NAME)
  41 # define __libc_rwlock_wrlock(NAME)
  42 # define __libc_rwlock_unlock(NAME)
  43 #endif
  44
  45 /* The internal variables in the standalone libintl.a must have different
  46    names than the internal variables in GNU libc, otherwise programs
  47    using libintl.a cannot be linked statically.  */
  48 #if !defined _LIBC
  49 # define _nl_default_dirname libintl_nl_default_dirname
  50 # define _nl_domain_bindings libintl_nl_domain_bindings
  51 #endif
  52
  53 /* Some compilers, like SunOS4 cc, don't have offsetof in <stddef.h>.  */
  54 #ifndef offsetof
  55 # define offsetof(type,ident) ((size_t)&(((type*)0)->ident))
  56 #endif
  57
  58 /* @@ end of prolog @@ */
  59
  60 /* Contains the default location of the message catalogs.  */
  61 extern const char _nl_default_dirname[];
  62 #ifdef _LIBC
  63 libc_hidden_proto (_nl_default_dirname)
  64 #endif
  65
  66 /* List with bindings of specific domains.  */
  67 extern struct binding *_nl_domain_bindings;
  68
  69 /* Lock variable to protect the global data in the gettext implementation.  */
  70 __libc_rwlock_define (extern, _nl_state_lock attribute_hidden)
  71
  72
  73 /* Names for the libintl functions are a problem.  They must not clash
  74    with existing names and they should follow ANSI C.  But this source
  75    code is also used in GNU C Library where the names have a __
  76    prefix.  So we have to make a difference here.  */
  77 #ifdef _LIBC
  78 # define BINDTEXTDOMAIN __bindtextdomain
  79 # define BIND_TEXTDOMAIN_CODESET __bind_textdomain_codeset
  80 # ifndef strdup
  81 #  define strdup(str) __strdup (str)
  82 # endif
  83 #else
  84 # define BINDTEXTDOMAIN libintl_bindtextdomain
  85 # define BIND_TEXTDOMAIN_CODESET libintl_bind_textdomain_codeset
  86 #endif
  87
  88 /* Prototypes for local functions.  */
  89 static void set_binding_values PARAMS ((const char *domainname,
  90                                         const char **dirnamep,
  91                                         const char **codesetp));
  92
  93 /* Specifies the directory name *DIRNAMEP and the output codeset *CODESETP
  94    to be used for the DOMAINNAME message catalog.
  95    If *DIRNAMEP or *CODESETP is NULL, the corresponding attribute is not
  96    modified, only the current value is returned.
  97    If DIRNAMEP or CODESETP is NULL, the corresponding attribute is neither
  98    modified nor returned.  */
  99 static void
 100 set_binding_values (domainname, dirnamep, codesetp)
 101      const char *domainname;
 102      const char **dirnamep;
 103      const char **codesetp;
 104 {
 105   struct binding *binding;
 106   int modified;
 107
 108   /* Some sanity checks.  */
 109   if (domainname == NULL || domainname[0] == '\0')
 110     {
 111       if (dirnamep)
 112         *dirnamep = NULL;
 113       if (codesetp)
 114         *codesetp = NULL;
 115       return;
 116     }
 117
 118   __libc_rwlock_wrlock (_nl_state_lock);
 119
 120   modified = 0;
 121
 122   for (binding = _nl_domain_bindings; binding != NULL; binding = binding->next)
 123     {
 124       int compare = strcmp (domainname, binding->domainname);
 125       if (compare == 0)
 126         /* We found it!  */
 127         break;
 128       if (compare < 0)
 129         {
 130           /* It is not in the list.  */
 131           binding = NULL;
 132           break;
 133         }
 134     }
 135
 136   if (binding != NULL)
 137     {
 138       if (dirnamep)
 139         {
 140           const char *dirname = *dirnamep;
 141
 142           if (dirname == NULL)
 143             /* The current binding has be to returned.  */
 144             *dirnamep = binding->dirname;
 145           else
 146             {
 147               /* The domain is already bound.  If the new value and the old
 148                  one are equal we simply do nothing.  Otherwise replace the
 149                  old binding.  */
 150               char *result = binding->dirname;
 151               if (strcmp (dirname, result) != 0)
 152                 {
 153                   if (strcmp (dirname, _nl_default_dirname) == 0)
 154                     result = (char *) _nl_default_dirname;
 155                   else
 156                     {
 157 #if defined _LIBC || defined HAVE_STRDUP
 158                       result = strdup (dirname);
 159 #else
 160                       size_t len = strlen (dirname) + 1;
 161                       result = (char *) malloc (len);
 162                       if (__builtin_expect (result != NULL, 1))
 163                         memcpy (result, dirname, len);
 164 #endif
 165                     }
 166
 167                   if (__builtin_expect (result != NULL, 1))
 168                     {
 169                       if (binding->dirname != _nl_default_dirname)
 170                         free (binding->dirname);
 171
 172                       binding->dirname = result;
 173                       modified = 1;
 174                     }
 175                 }
 176               *dirnamep = result;
 177             }
 178         }
 179
 180       if (codesetp)
 181         {
 182           const char *codeset = *codesetp;
 183
 184           if (codeset == NULL)
 185             /* The current binding has be to returned.  */
 186             *codesetp = binding->codeset;
 187           else
 188             {
 189               /* The domain is already bound.  If the new value and the old
 190                  one are equal we simply do nothing.  Otherwise replace the
 191                  old binding.  */
 192               char *result = binding->codeset;
 193               if (result == NULL || strcmp (codeset, result) != 0)
 194                 {
 195 #if defined _LIBC || defined HAVE_STRDUP
 196                   result = strdup (codeset);
 197 #else
 198                   size_t len = strlen (codeset) + 1;
 199                   result = (char *) malloc (len);
 200                   if (__builtin_expect (result != NULL, 1))
 201                     memcpy (result, codeset, len);
 202 #endif
 203
 204                   if (__builtin_expect (result != NULL, 1))
 205                     {
 206                       if (binding->codeset != NULL)
 207                         free (binding->codeset);
 208
 209                       binding->codeset = result;
 210                       ++binding->codeset_cntr;
 211                       modified = 1;
 212                     }
 213                 }
 214               *codesetp = result;
 215             }
 216         }
 217     }
 218   else if ((dirnamep == NULL || *dirnamep == NULL)
 219            && (codesetp == NULL || *codesetp == NULL))
 220     {
 221       /* Simply return the default values.  */
 222       if (dirnamep)
 223         *dirnamep = _nl_default_dirname;
 224       if (codesetp)
 225         *codesetp = NULL;
 226     }
 227   else
 228     {
 229       /* We have to create a new binding.  */
 230       size_t len = strlen (domainname) + 1;
 231       struct binding *new_binding =
 232         (struct binding *) malloc (offsetof (struct binding, domainname) + len);
 233
 234       if (__builtin_expect (new_binding == NULL, 0))
 235         goto failed;
 236
 237       memcpy (new_binding->domainname, domainname, len);
 238
 239       if (dirnamep)
 240         {
 241           const char *dirname = *dirnamep;
 242
 243           if (dirname == NULL)
 244             /* The default value.  */
 245             dirname = _nl_default_dirname;
 246           else
 247             {
 248               if (strcmp (dirname, _nl_default_dirname) == 0)
 249                 dirname = _nl_default_dirname;
 250               else
 251                 {
 252                   char *result;
 253 #if defined _LIBC || defined HAVE_STRDUP
 254                   result = strdup (dirname);
 255                   if (__builtin_expect (result == NULL, 0))
 256                     goto failed_dirname;
 257 #else
 258                   size_t len = strlen (dirname) + 1;
 259                   result = (char *) malloc (len);
 260                   if (__builtin_expect (result == NULL, 0))
 261                     goto failed_dirname;
 262                   memcpy (result, dirname, len);
 263 #endif
 264                   dirname = result;
 265                 }
 266             }
 267           *dirnamep = dirname;
 268           new_binding->dirname = (char *) dirname;
 269         }
 270       else
 271         /* The default value.  */
 272         new_binding->dirname = (char *) _nl_default_dirname;
 273
 274       new_binding->codeset_cntr = 0;
 275
 276       if (codesetp)
 277         {
 278           const char *codeset = *codesetp;
 279
 280           if (codeset != NULL)
 281             {
 282               char *result;
 283
 284 #if defined _LIBC || defined HAVE_STRDUP
 285               result = strdup (codeset);
 286               if (__builtin_expect (result == NULL, 0))
 287                 goto failed_codeset;
 288 #else
 289               size_t len = strlen (codeset) + 1;
 290               result = (char *) malloc (len);
 291               if (__builtin_expect (result == NULL, 0))
 292                 goto failed_codeset;
 293               memcpy (result, codeset, len);
 294 #endif
 295               codeset = result;
 296               ++new_binding->codeset_cntr;
 297             }
 298           *codesetp = codeset;
 299           new_binding->codeset = (char *) codeset;
 300         }
 301       else
 302         new_binding->codeset = NULL;
 303
 304       /* Now enqueue it.  */
 305       if (_nl_domain_bindings == NULL
 306           || strcmp (domainname, _nl_domain_bindings->domainname) < 0)
 307         {
 308           new_binding->next = _nl_domain_bindings;
 309           _nl_domain_bindings = new_binding;
 310         }
 311       else
 312         {
 313           binding = _nl_domain_bindings;
 314           while (binding->next != NULL
 315                  && strcmp (domainname, binding->next->domainname) > 0)
 316             binding = binding->next;
 317
 318           new_binding->next = binding->next;
 319           binding->next = new_binding;
 320         }
 321
 322       modified = 1;
 323
 324       /* Here we deal with memory allocation failures.  */
 325       if (0)
 326         {
 327         failed_codeset:
 328           if (new_binding->dirname != _nl_default_dirname)
 329             free (new_binding->dirname);
 330         failed_dirname:
 331           free (new_binding);
 332         failed:
 333           if (dirnamep)
 334             *dirnamep = NULL;
 335           if (codesetp)
 336             *codesetp = NULL;
 337         }
 338     }
 339
 340   /* If we modified any binding, we flush the caches.  */
 341   if (modified)
 342     ++_nl_msg_cat_cntr;
 343
 344   __libc_rwlock_unlock (_nl_state_lock);
 345 }
 346
 347 /* Specify that the DOMAINNAME message catalog will be found
 348    in DIRNAME rather than in the system locale data base.  */
 349 char *
 350 BINDTEXTDOMAIN (domainname, dirname)
 351      const char *domainname;
 352      const char *dirname;
 353 {
 354   set_binding_values (domainname, &dirname, NULL);
 355   return (char *) dirname;
 356 }
 357
 358 /* Specify the character encoding in which the messages from the
 359    DOMAINNAME message catalog will be returned.  */
 360 char *
 361 BIND_TEXTDOMAIN_CODESET (domainname, codeset)
 362      const char *domainname;
 363      const char *codeset;
 364 {
 365   set_binding_values (domainname, NULL, &codeset);
 366   return (char *) codeset;
 367 }
 368
 369 #ifdef _LIBC
 370 /* Aliases for function names in GNU C Library.  */
 371 weak_alias (__bindtextdomain, bindtextdomain);
 372 weak_alias (__bind_textdomain_codeset, bind_textdomain_codeset);
 373 #endif