intl/bindtextdom.c

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