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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
  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 #ifdef _LIBC
  62 extern const char _nl_default_dirname_internal[] attribute_hidden;
  63 #else
  64 # define INTUSE(name) name
  65 #endif
  66
  67 /* List with bindings of specific domains.  */
  68 extern struct binding *_nl_domain_bindings;
  69
  70 /* Lock variable to protect the global data in the gettext implementation.  */
  71 __libc_rwlock_define (extern, _nl_state_lock attribute_hidden)
  72
  73
  74 /* Names for the libintl functions are a problem.  They must not clash
  75    with existing names and they should follow ANSI C.  But this source
  76    code is also used in GNU C Library where the names have a __
  77    prefix.  So we have to make a difference here.  */
  78 #ifdef _LIBC
  79 # define BINDTEXTDOMAIN __bindtextdomain
  80 # define BIND_TEXTDOMAIN_CODESET __bind_textdomain_codeset
  81 # ifndef strdup
  82 #  define strdup(str) __strdup (str)
  83 # endif
  84 #else
  85 # define BINDTEXTDOMAIN libintl_bindtextdomain
  86 # define BIND_TEXTDOMAIN_CODESET libintl_bind_textdomain_codeset
  87 #endif
  88
  89 /* Prototypes for local functions.  */
  90 static void set_binding_values PARAMS ((const char *domainname,
  91                                         const char **dirnamep,
  92                                         const char **codesetp));
  93
  94 /* Specifies the directory name *DIRNAMEP and the output codeset *CODESETP
  95    to be used for the DOMAINNAME message catalog.
  96    If *DIRNAMEP or *CODESETP is NULL, the corresponding attribute is not
  97    modified, only the current value is returned.
  98    If DIRNAMEP or CODESETP is NULL, the corresponding attribute is neither
  99    modified nor returned.  */
 100 static void
 101 set_binding_values (domainname, dirnamep, codesetp)
 102      const char *domainname;
 103      const char **dirnamep;
 104      const char **codesetp;
 105 {
 106   struct binding *binding;
 107   int modified;
 108
 109   /* Some sanity checks.  */
 110   if (domainname == NULL || domainname[0] == '\0')
 111     {
 112       if (dirnamep)
 113         *dirnamep = NULL;
 114       if (codesetp)
 115         *codesetp = NULL;
 116       return;
 117     }
 118
 119   __libc_rwlock_wrlock (_nl_state_lock);
 120
 121   modified = 0;
 122
 123   for (binding = _nl_domain_bindings; binding != NULL; binding = binding->next)
 124     {
 125       int compare = strcmp (domainname, binding->domainname);
 126       if (compare == 0)
 127         /* We found it!  */
 128         break;
 129       if (compare < 0)
 130         {
 131           /* It is not in the list.  */
 132           binding = NULL;
 133           break;
 134         }
 135     }
 136
 137   if (binding != NULL)
 138     {
 139       if (dirnamep)
 140         {
 141           const char *dirname = *dirnamep;
 142
 143           if (dirname == NULL)
 144             /* The current binding has be to returned.  */
 145             *dirnamep = binding->dirname;
 146           else
 147             {
 148               /* The domain is already bound.  If the new value and the old
 149                  one are equal we simply do nothing.  Otherwise replace the
 150                  old binding.  */
 151               char *result = binding->dirname;
 152               if (strcmp (dirname, result) != 0)
 153                 {
 154                   if (strcmp (dirname, INTUSE(_nl_default_dirname)) == 0)
 155                     result = (char *) INTUSE(_nl_default_dirname);
 156                   else
 157                     {
 158 #if defined _LIBC || defined HAVE_STRDUP
 159                       result = strdup (dirname);
 160 #else
 161                       size_t len = strlen (dirname) + 1;
 162                       result = (char *) malloc (len);
 163                       if (__builtin_expect (result != NULL, 1))
 164                         memcpy (result, dirname, len);
 165 #endif
 166                     }
 167
 168                   if (__builtin_expect (result != NULL, 1))
 169                     {
 170                       if (binding->dirname != INTUSE(_nl_default_dirname))
 171                         free (binding->dirname);
 172
 173                       binding->dirname = result;
 174                       modified = 1;
 175                     }
 176                 }
 177               *dirnamep = result;
 178             }
 179         }
 180
 181       if (codesetp)
 182         {
 183           const char *codeset = *codesetp;
 184
 185           if (codeset == NULL)
 186             /* The current binding has be to returned.  */
 187             *codesetp = binding->codeset;
 188           else
 189             {
 190               /* The domain is already bound.  If the new value and the old
 191                  one are equal we simply do nothing.  Otherwise replace the
 192                  old binding.  */
 193               char *result = binding->codeset;
 194               if (result == NULL || strcmp (codeset, result) != 0)
 195                 {
 196 #if defined _LIBC || defined HAVE_STRDUP
 197                   result = strdup (codeset);
 198 #else
 199                   size_t len = strlen (codeset) + 1;
 200                   result = (char *) malloc (len);
 201                   if (__builtin_expect (result != NULL, 1))
 202                     memcpy (result, codeset, len);
 203 #endif
 204
 205                   if (__builtin_expect (result != NULL, 1))
 206                     {
 207                       if (binding->codeset != NULL)
 208                         free (binding->codeset);
 209
 210                       binding->codeset = result;
 211                       binding->codeset_cntr++;
 212                       modified = 1;
 213                     }
 214                 }
 215               *codesetp = result;
 216             }
 217         }
 218     }
 219   else if ((dirnamep == NULL || *dirnamep == NULL)
 220            && (codesetp == NULL || *codesetp == NULL))
 221     {
 222       /* Simply return the default values.  */
 223       if (dirnamep)
 224         *dirnamep = INTUSE(_nl_default_dirname);
 225       if (codesetp)
 226         *codesetp = NULL;
 227     }
 228   else
 229     {
 230       /* We have to create a new binding.  */
 231       size_t len = strlen (domainname) + 1;
 232       struct binding *new_binding =
 233         (struct binding *) malloc (offsetof (struct binding, domainname) + len);
 234
 235       if (__builtin_expect (new_binding == NULL, 0))
 236         goto failed;
 237
 238       memcpy (new_binding->domainname, domainname, len);
 239
 240       if (dirnamep)
 241         {
 242           const char *dirname = *dirnamep;
 243
 244           if (dirname == NULL)
 245             /* The default value.  */
 246             dirname = INTUSE(_nl_default_dirname);
 247           else
 248             {
 249               if (strcmp (dirname, INTUSE(_nl_default_dirname)) == 0)
 250                 dirname = INTUSE(_nl_default_dirname);
 251               else
 252                 {
 253                   char *result;
 254 #if defined _LIBC || defined HAVE_STRDUP
 255                   result = strdup (dirname);
 256                   if (__builtin_expect (result == NULL, 0))
 257                     goto failed_dirname;
 258 #else
 259                   size_t len = strlen (dirname) + 1;
 260                   result = (char *) malloc (len);
 261                   if (__builtin_expect (result == NULL, 0))
 262                     goto failed_dirname;
 263                   memcpy (result, dirname, len);
 264 #endif
 265                   dirname = result;
 266                 }
 267             }
 268           *dirnamep = dirname;
 269           new_binding->dirname = (char *) dirname;
 270         }
 271       else
 272         /* The default value.  */
 273         new_binding->dirname = (char *) INTUSE(_nl_default_dirname);
 274
 275       new_binding->codeset_cntr = 0;
 276
 277       if (codesetp)
 278         {
 279           const char *codeset = *codesetp;
 280
 281           if (codeset != NULL)
 282             {
 283               char *result;
 284
 285 #if defined _LIBC || defined HAVE_STRDUP
 286               result = strdup (codeset);
 287               if (__builtin_expect (result == NULL, 0))
 288                 goto failed_codeset;
 289 #else
 290               size_t len = strlen (codeset) + 1;
 291               result = (char *) malloc (len);
 292               if (__builtin_expect (result == NULL, 0))
 293                 goto failed_codeset;
 294               memcpy (result, codeset, len);
 295 #endif
 296               codeset = result;
 297               new_binding->codeset_cntr++;
 298             }
 299           *codesetp = codeset;
 300           new_binding->codeset = (char *) codeset;
 301         }
 302       else
 303         new_binding->codeset = NULL;
 304
 305       /* Now enqueue it.  */
 306       if (_nl_domain_bindings == NULL
 307           || strcmp (domainname, _nl_domain_bindings->domainname) < 0)
 308         {
 309           new_binding->next = _nl_domain_bindings;
 310           _nl_domain_bindings = new_binding;
 311         }
 312       else
 313         {
 314           binding = _nl_domain_bindings;
 315           while (binding->next != NULL
 316                  && strcmp (domainname, binding->next->domainname) > 0)
 317             binding = binding->next;
 318
 319           new_binding->next = binding->next;
 320           binding->next = new_binding;
 321         }
 322
 323       modified = 1;
 324
 325       /* Here we deal with memory allocation failures.  */
 326       if (0)
 327         {
 328         failed_codeset:
 329           if (new_binding->dirname != INTUSE(_nl_default_dirname))
 330             free (new_binding->dirname);
 331         failed_dirname:
 332           free (new_binding);
 333         failed:
 334           if (dirnamep)
 335             *dirnamep = NULL;
 336           if (codesetp)
 337             *codesetp = NULL;
 338         }
 339     }
 340
 341   /* If we modified any binding, we flush the caches.  */
 342   if (modified)
 343     ++_nl_msg_cat_cntr;
 344
 345   __libc_rwlock_unlock (_nl_state_lock);
 346 }
 347
 348 /* Specify that the DOMAINNAME message catalog will be found
 349    in DIRNAME rather than in the system locale data base.  */
 350 char *
 351 BINDTEXTDOMAIN (domainname, dirname)
 352      const char *domainname;
 353      const char *dirname;
 354 {
 355   set_binding_values (domainname, &dirname, NULL);
 356   return (char *) dirname;
 357 }
 358
 359 /* Specify the character encoding in which the messages from the
 360    DOMAINNAME message catalog will be returned.  */
 361 char *
 362 BIND_TEXTDOMAIN_CODESET (domainname, codeset)
 363      const char *domainname;
 364      const char *codeset;
 365 {
 366   set_binding_values (domainname, NULL, &codeset);
 367   return (char *) codeset;
 368 }
 369
 370 #ifdef _LIBC
 371 /* Aliases for function names in GNU C Library.  */
 372 weak_alias (__bindtextdomain, bindtextdomain);
 373 weak_alias (__bind_textdomain_codeset, bind_textdomain_codeset);
 374 #endif