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                       modified = 1;
 211                     }
 212                 }
 213               *codesetp = result;
 214             }
 215         }
 216     }
 217   else if ((dirnamep == NULL || *dirnamep == NULL)
 218            && (codesetp == NULL || *codesetp == NULL))
 219     {
 220       /* Simply return the default values.  */
 221       if (dirnamep)
 222         *dirnamep = _nl_default_dirname;
 223       if (codesetp)
 224         *codesetp = NULL;
 225     }
 226   else
 227     {
 228       /* We have to create a new binding.  */
 229       size_t len = strlen (domainname) + 1;
 230       struct binding *new_binding =
 231         (struct binding *) malloc (offsetof (struct binding, domainname) + len);
 232
 233       if (__builtin_expect (new_binding == NULL, 0))
 234         goto failed;
 235
 236       memcpy (new_binding->domainname, domainname, len);
 237
 238       if (dirnamep)
 239         {
 240           const char *dirname = *dirnamep;
 241
 242           if (dirname == NULL)
 243             /* The default value.  */
 244             dirname = _nl_default_dirname;
 245           else
 246             {
 247               if (strcmp (dirname, _nl_default_dirname) == 0)
 248                 dirname = _nl_default_dirname;
 249               else
 250                 {
 251                   char *result;
 252 #if defined _LIBC || defined HAVE_STRDUP
 253                   result = strdup (dirname);
 254                   if (__builtin_expect (result == NULL, 0))
 255                     goto failed_dirname;
 256 #else
 257                   size_t len = strlen (dirname) + 1;
 258                   result = (char *) malloc (len);
 259                   if (__builtin_expect (result == NULL, 0))
 260                     goto failed_dirname;
 261                   memcpy (result, dirname, len);
 262 #endif
 263                   dirname = result;
 264                 }
 265             }
 266           *dirnamep = dirname;
 267           new_binding->dirname = (char *) dirname;
 268         }
 269       else
 270         /* The default value.  */
 271         new_binding->dirname = (char *) _nl_default_dirname;
 272
 273       if (codesetp)
 274         {
 275           const char *codeset = *codesetp;
 276
 277           if (codeset != NULL)
 278             {
 279               char *result;
 280
 281 #if defined _LIBC || defined HAVE_STRDUP
 282               result = strdup (codeset);
 283               if (__builtin_expect (result == NULL, 0))
 284                 goto failed_codeset;
 285 #else
 286               size_t len = strlen (codeset) + 1;
 287               result = (char *) malloc (len);
 288               if (__builtin_expect (result == NULL, 0))
 289                 goto failed_codeset;
 290               memcpy (result, codeset, len);
 291 #endif
 292               codeset = result;
 293             }
 294           *codesetp = codeset;
 295           new_binding->codeset = (char *) codeset;
 296         }
 297       else
 298         new_binding->codeset = NULL;
 299
 300       /* Now enqueue it.  */
 301       if (_nl_domain_bindings == NULL
 302           || strcmp (domainname, _nl_domain_bindings->domainname) < 0)
 303         {
 304           new_binding->next = _nl_domain_bindings;
 305           _nl_domain_bindings = new_binding;
 306         }
 307       else
 308         {
 309           binding = _nl_domain_bindings;
 310           while (binding->next != NULL
 311                  && strcmp (domainname, binding->next->domainname) > 0)
 312             binding = binding->next;
 313
 314           new_binding->next = binding->next;
 315           binding->next = new_binding;
 316         }
 317
 318       modified = 1;
 319
 320       /* Here we deal with memory allocation failures.  */
 321       if (0)
 322         {
 323         failed_codeset:
 324           if (new_binding->dirname != _nl_default_dirname)
 325             free (new_binding->dirname);
 326         failed_dirname:
 327           free (new_binding);
 328         failed:
 329           if (dirnamep)
 330             *dirnamep = NULL;
 331           if (codesetp)
 332             *codesetp = NULL;
 333         }
 334     }
 335
 336   /* If we modified any binding, we flush the caches.  */
 337   if (modified)
 338     ++_nl_msg_cat_cntr;
 339
 340   __libc_rwlock_unlock (_nl_state_lock);
 341 }
 342
 343 /* Specify that the DOMAINNAME message catalog will be found
 344    in DIRNAME rather than in the system locale data base.  */
 345 char *
 346 BINDTEXTDOMAIN (domainname, dirname)
 347      const char *domainname;
 348      const char *dirname;
 349 {
 350   set_binding_values (domainname, &dirname, NULL);
 351   return (char *) dirname;
 352 }
 353
 354 /* Specify the character encoding in which the messages from the
 355    DOMAINNAME message catalog will be returned.  */
 356 char *
 357 BIND_TEXTDOMAIN_CODESET (domainname, codeset)
 358      const char *domainname;
 359      const char *codeset;
 360 {
 361   set_binding_values (domainname, NULL, &codeset);
 362   return (char *) codeset;
 363 }
 364
 365 #ifdef _LIBC
 366 /* Aliases for function names in GNU C Library.  */
 367 weak_alias (__bindtextdomain, bindtextdomain);
 368 weak_alias (__bind_textdomain_codeset, bind_textdomain_codeset);
 369 #endif