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loadmsgcat.c

00001 /* Load needed message catalogs.
00002    Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
00003 
00004    This program is free software; you can redistribute it and/or modify
00005    it under the terms of the GNU General Public License as published by
00006    the Free Software Foundation; either version 2, or (at your option)
00007    any later version.
00008 
00009    This program is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012    GNU General Public License for more details.
00013 
00014    You should have received a copy of the GNU General Public License
00015    along with this program; if not, write to the Free Software Foundation,
00016    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
00017 
00018 #ifdef HAVE_CONFIG_H
00019 # include <config.h>
00020 #endif
00021 
00022 #include <fcntl.h>
00023 #include <sys/types.h>
00024 #include <sys/stat.h>
00025 
00026 #if defined STDC_HEADERS || defined _LIBC
00027 # include <stdlib.h>
00028 #endif
00029 
00030 #if defined HAVE_UNISTD_H || defined _LIBC
00031 # include <unistd.h>
00032 #endif
00033 
00034 #if (defined HAVE_MMAP && defined HAVE_MUNMAP && !defined DISALLOW_MMAP) \
00035     || (defined _LIBC && defined _POSIX_MAPPED_FILES)
00036 # include <sys/mman.h>
00037 # undef HAVE_MMAP
00038 # define HAVE_MMAP  1
00039 #else
00040 # undef HAVE_MMAP
00041 #endif
00042 
00043 #include "gettext.h"
00044 #include "gettextP.h"
00045 
00046 /* @@ end of prolog @@ */
00047 
00048 #ifdef _LIBC
00049 /* Rename the non ISO C functions.  This is required by the standard
00050    because some ISO C functions will require linking with this object
00051    file and the name space must not be polluted.  */
00052 # define open   __open
00053 # define close  __close
00054 # define read   __read
00055 # define mmap   __mmap
00056 # define munmap __munmap
00057 #endif
00058 
00059 /* We need a sign, whether a new catalog was loaded, which can be associated
00060    with all translations.  This is important if the translations are
00061    cached by one of GCC's features.  */
00062 int _nl_msg_cat_cntr = 0;
00063 
00064 
00065 /* Load the message catalogs specified by FILENAME.  If it is no valid
00066    message catalog do nothing.  */
00067 void
00068 internal_function
00069 _nl_load_domain (domain_file)
00070      struct loaded_l10nfile *domain_file;
00071 {
00072   int fd;
00073   size_t size;
00074   struct stat st;
00075   struct mo_file_header *data = (struct mo_file_header *) -1;
00076   int use_mmap = 0;
00077   struct loaded_domain *domain;
00078 
00079   domain_file->decided = 1;
00080   domain_file->data = NULL;
00081 
00082   /* If the record does not represent a valid locale the FILENAME
00083      might be NULL.  This can happen when according to the given
00084      specification the locale file name is different for XPG and CEN
00085      syntax.  */
00086   if (domain_file->filename == NULL)
00087     return;
00088 
00089   /* Try to open the addressed file.  */
00090   fd = open (domain_file->filename, O_RDONLY);
00091   if (fd == -1)
00092     return;
00093 
00094   /* We must know about the size of the file.  */
00095   if (fstat (fd, &st) != 0
00096       || (size = (size_t) st.st_size) != st.st_size
00097       || size < sizeof (struct mo_file_header))
00098     {
00099       /* Something went wrong.  */
00100       close (fd);
00101       return;
00102     }
00103 
00104 #ifdef HAVE_MMAP
00105   /* Now we are ready to load the file.  If mmap() is available we try
00106      this first.  If not available or it failed we try to load it.  */
00107   data = (struct mo_file_header *) mmap (NULL, size, PROT_READ,
00108                      MAP_PRIVATE, fd, 0);
00109 
00110   if (data != (struct mo_file_header *) -1)
00111     {
00112       /* mmap() call was successful.  */
00113       close (fd);
00114       use_mmap = 1;
00115     }
00116 #endif
00117 
00118   /* If the data is not yet available (i.e. mmap'ed) we try to load
00119      it manually.  */
00120   if (data == (struct mo_file_header *) -1)
00121     {
00122       size_t to_read;
00123       char *read_ptr;
00124 
00125       data = (struct mo_file_header *) malloc (size);
00126       if (data == NULL)
00127     return;
00128 
00129       to_read = size;
00130       read_ptr = (char *) data;
00131       do
00132     {
00133       long int nb = (long int) read (fd, read_ptr, to_read);
00134       if (nb == -1)
00135         {
00136           close (fd);
00137           return;
00138         }
00139 
00140       read_ptr += nb;
00141       to_read -= nb;
00142     }
00143       while (to_read > 0);
00144 
00145       close (fd);
00146     }
00147 
00148   /* Using the magic number we can test whether it really is a message
00149      catalog file.  */
00150   if (data->magic != _MAGIC && data->magic != _MAGIC_SWAPPED)
00151     {
00152       /* The magic number is wrong: not a message catalog file.  */
00153 #ifdef HAVE_MMAP
00154       if (use_mmap)
00155     munmap ((caddr_t) data, size);
00156       else
00157 #endif
00158     free (data);
00159       return;
00160     }
00161 
00162   domain_file->data
00163     = (struct loaded_domain *) malloc (sizeof (struct loaded_domain));
00164   if (domain_file->data == NULL)
00165     return;
00166 
00167   domain = (struct loaded_domain *) domain_file->data;
00168   domain->data = (char *) data;
00169   domain->use_mmap = use_mmap;
00170   domain->mmap_size = size;
00171   domain->must_swap = data->magic != _MAGIC;
00172 
00173   /* Fill in the information about the available tables.  */
00174   switch (W (domain->must_swap, data->revision))
00175     {
00176     case 0:
00177       domain->nstrings = W (domain->must_swap, data->nstrings);
00178       domain->orig_tab = (struct string_desc *)
00179     ((char *) data + W (domain->must_swap, data->orig_tab_offset));
00180       domain->trans_tab = (struct string_desc *)
00181     ((char *) data + W (domain->must_swap, data->trans_tab_offset));
00182       domain->hash_size = W (domain->must_swap, data->hash_tab_size);
00183       domain->hash_tab = (nls_uint32 *)
00184     ((char *) data + W (domain->must_swap, data->hash_tab_offset));
00185       break;
00186     default:
00187       /* This is an invalid revision.  */
00188 #ifdef HAVE_MMAP
00189       if (use_mmap)
00190     munmap ((caddr_t) data, size);
00191       else
00192 #endif
00193     free (data);
00194       free (domain);
00195       domain_file->data = NULL;
00196       return;
00197     }
00198 
00199   /* Show that one domain is changed.  This might make some cached
00200      translations invalid.  */
00201   ++_nl_msg_cat_cntr;
00202 }
00203 
00204 
00205 #ifdef _LIBC
00206 void
00207 internal_function
00208 _nl_unload_domain (domain)
00209      struct loaded_domain *domain;
00210 {
00211 #ifdef _POSIX_MAPPED_FILES
00212   if (domain->use_mmap)
00213     munmap ((caddr_t) domain->data, domain->mmap_size);
00214   else
00215 #endif  /* _POSIX_MAPPED_FILES */
00216     free ((void *) domain->data);
00217 
00218   free (domain);
00219 }
00220 #endif

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