locale/loadlocale.c

   1 /* Functions to read locale data files.
   2    Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <errno.h>
  22 #include <fcntl.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/mman.h>
  27 #include <sys/stat.h>
  28
  29 #include "localeinfo.h"
  30
  31
  32 static const size_t _nl_category_num_items[] =
  33 {
  34 #define DEFINE_CATEGORY(category, category_name, items, a) \
  35   [category] = _NL_ITEM_INDEX (_NL_NUM_##category),
  36 #include "categories.def"
  37 #undef  DEFINE_CATEGORY
  38 };
  39
  40
  41 #define NO_PAREN(arg, rest...) arg, ##rest
  42
  43 #define DEFINE_CATEGORY(category, category_name, items, a) \
  44 static const enum value_type _nl_value_type_##category[] = { NO_PAREN items };
  45 #define DEFINE_ELEMENT(element, element_name, optstd, type, rest...) \
  46   [_NL_ITEM_INDEX (element)] = type,
  47 #include "categories.def"
  48 #undef DEFINE_CATEGORY
  49
  50 static const enum value_type *_nl_value_types[] =
  51 {
  52 #define DEFINE_CATEGORY(category, category_name, items, a) \
  53   [category] = _nl_value_type_##category,
  54 #include "categories.def"
  55 #undef DEFINE_CATEGORY
  56 };
  57
  58
  59 void
  60 _nl_load_locale (struct loaded_l10nfile *file, int category)
  61 {
  62   int fd;
  63   struct
  64     {
  65       unsigned int magic;
  66       unsigned int nstrings;
  67       unsigned int strindex[0];
  68     } *filedata;
  69   struct stat st;
  70   struct locale_data *newdata;
  71   int save_err;
  72   int mmaped = 1;
  73   size_t cnt;
  74
  75   file->decided = 1;
  76   file->data = NULL;
  77
  78   fd = __open (file->filename, O_RDONLY);
  79   if (fd < 0)
  80     /* Cannot open the file.  */
  81     return;
  82
  83   if (__fstat (fd, &st) < 0)
  84     goto puntfd;
  85   if (S_ISDIR (st.st_mode))
  86     {
  87       /* LOCALE/LC_foo is a directory; open LOCALE/LC_foo/SYS_LC_foo
  88            instead.  */
  89       char *newp;
  90
  91       __close (fd);
  92
  93       newp = (char *) alloca (strlen (file->filename)
  94                               + 5 + _nl_category_name_sizes[category] + 1);
  95       __stpcpy (__stpcpy (__stpcpy (newp, file->filename), "/SYS_"),
  96                 _nl_category_names[category]);
  97
  98       fd = __open (newp, O_RDONLY);
  99       if (fd < 0)
 100         return;
 101
 102       if (__fstat (fd, &st) < 0)
 103         goto puntfd;
 104     }
 105
 106   /* Map in the file's data.  */
 107   save_err = errno;
 108 #ifndef MAP_COPY
 109   /* Linux seems to lack read-only copy-on-write.  */
 110 #define MAP_COPY MAP_PRIVATE
 111 #endif
 112 #ifndef MAP_FILE
 113   /* Some systems do not have this flag; it is superfluous.  */
 114 #define MAP_FILE 0
 115 #endif
 116 #ifndef MAP_INHERIT
 117   /* Some systems might lack this; they lose.  */
 118 #define MAP_INHERIT 0
 119 #endif
 120   filedata = (void *) __mmap ((caddr_t) 0, st.st_size, PROT_READ,
 121                               MAP_FILE|MAP_COPY|MAP_INHERIT, fd, 0);
 122   if ((void *) filedata == MAP_FAILED)
 123     {
 124       if (errno == ENOSYS)
 125         {
 126           /* No mmap; allocate a buffer and read from the file.  */
 127           mmaped = 0;
 128           filedata = malloc (st.st_size);
 129           if (filedata != NULL)
 130             {
 131               off_t to_read = st.st_size;
 132               ssize_t nread;
 133               char *p = (char *) filedata;
 134               while (to_read > 0)
 135                 {
 136                   nread = __read (fd, p, to_read);
 137                   if (nread <= 0)
 138                     {
 139                       free (filedata);
 140                       if (nread == 0)
 141                         __set_errno (EINVAL); /* Bizarreness going on.  */
 142                       goto puntfd;
 143                     }
 144                   p += nread;
 145                   to_read -= nread;
 146                 }
 147             }
 148           else
 149             goto puntfd;
 150           __set_errno (save_err);
 151         }
 152       else
 153         goto puntfd;
 154     }
 155   else if (st.st_size < sizeof (*filedata))
 156     /* This cannot be a locale data file since it's too small.  */
 157     goto puntfd;
 158
 159   if (filedata->magic != LIMAGIC (category))
 160     /* Bad data file in either byte order.  */
 161     {
 162     puntmap:
 163       __munmap ((caddr_t) filedata, st.st_size);
 164     puntfd:
 165       __close (fd);
 166       return;
 167     }
 168
 169   if (filedata->nstrings < _nl_category_num_items[category] ||
 170       (sizeof *filedata + filedata->nstrings * sizeof (unsigned int)
 171        >= (size_t) st.st_size))
 172     {
 173       /* Insufficient data.  */
 174       __set_errno (EINVAL);
 175       goto puntmap;
 176     }
 177
 178   newdata = malloc (sizeof *newdata
 179                     + filedata->nstrings * sizeof (union locale_data_value));
 180   if (! newdata)
 181     goto puntmap;
 182
 183   newdata->name = NULL; /* This will be filled if necessary in findlocale.c. */
 184   newdata->filedata = (void *) filedata;
 185   newdata->filesize = st.st_size;
 186   newdata->mmaped = mmaped;
 187   newdata->usage_count = 0;
 188   newdata->nstrings = filedata->nstrings;
 189   for (cnt = 0; cnt < newdata->nstrings; ++cnt)
 190     {
 191       off_t idx = filedata->strindex[cnt];
 192       if (idx > newdata->filesize)
 193         {
 194           free (newdata);
 195           __set_errno (EINVAL);
 196           goto puntmap;
 197         }
 198       if (_nl_value_types[category][cnt] == word)
 199         newdata->values[cnt].word = *((u_int32_t *) (newdata->filedata + idx));
 200       else
 201         newdata->values[cnt].string = newdata->filedata + idx;
 202     }
 203
 204   __close (fd);
 205   file->data = newdata;
 206 }
 207
 208 void
 209 _nl_unload_locale (struct locale_data *locale)
 210 {
 211   if (locale->mmaped)
 212     __munmap ((caddr_t) locale->filedata, locale->filesize);
 213   else
 214     free ((void *) locale->filedata);
 215
 216   free (locale);
 217 }