locale/loadlocale.c

   1 /* Functions to read locale data files.
   2    Copyright (C) 1996-2015 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 Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the 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    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <assert.h>
  21 #include <errno.h>
  22 #include <fcntl.h>
  23 #include <locale.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #ifdef _POSIX_MAPPED_FILES
  28 # include <sys/mman.h>
  29 #endif
  30 #include <sys/stat.h>
  31
  32 #include <not-cancel.h>
  33 #include "localeinfo.h"
  34
  35
  36 static const size_t _nl_category_num_items[] =
  37 {
  38 #define DEFINE_CATEGORY(category, category_name, items, a) \
  39   [category] = _NL_ITEM_INDEX (_NL_NUM_##category),
  40 #include "categories.def"
  41 #undef  DEFINE_CATEGORY
  42 };
  43
  44
  45 #define NO_PAREN(arg, rest...) arg, ##rest
  46
  47 #define DEFINE_CATEGORY(category, category_name, items, a) \
  48 static const enum value_type _nl_value_type_##category[] = { NO_PAREN items };
  49 #define DEFINE_ELEMENT(element, element_name, optstd, type, rest...) \
  50   [_NL_ITEM_INDEX (element)] = type,
  51 #include "categories.def"
  52 #undef DEFINE_CATEGORY
  53
  54 static const enum value_type *const _nl_value_types[] =
  55 {
  56 #define DEFINE_CATEGORY(category, category_name, items, a) \
  57   [category] = _nl_value_type_##category,
  58 #include "categories.def"
  59 #undef DEFINE_CATEGORY
  60 };
  61
  62
  63 struct __locale_data *
  64 internal_function
  65 _nl_intern_locale_data (int category, const void *data, size_t datasize)
  66 {
  67   const struct
  68     {
  69       unsigned int magic;
  70       unsigned int nstrings;
  71       unsigned int strindex[0];
  72     } *const filedata = data;
  73   struct __locale_data *newdata;
  74   size_t cnt;
  75
  76   if (__builtin_expect (datasize < sizeof *filedata, 0)
  77       || __builtin_expect (filedata->magic != LIMAGIC (category), 0))
  78     {
  79       /* Bad data file.  */
  80       __set_errno (EINVAL);
  81       return NULL;
  82     }
  83
  84   if (__builtin_expect (filedata->nstrings < _nl_category_num_items[category],
  85                         0)
  86       || (__builtin_expect (sizeof *filedata
  87                             + filedata->nstrings * sizeof (unsigned int)
  88                             >= datasize, 0)))
  89     {
  90       /* Insufficient data.  */
  91       __set_errno (EINVAL);
  92       return NULL;
  93     }
  94
  95   newdata = malloc (sizeof *newdata
  96                     + filedata->nstrings * sizeof (union locale_data_value));
  97   if (newdata == NULL)
  98     return NULL;
  99
 100   newdata->filedata = (void *) filedata;
 101   newdata->filesize = datasize;
 102   newdata->private.data = NULL;
 103   newdata->private.cleanup = NULL;
 104   newdata->usage_count = 0;
 105   newdata->use_translit = 0;
 106   newdata->nstrings = filedata->nstrings;
 107   for (cnt = 0; cnt < newdata->nstrings; ++cnt)
 108     {
 109       size_t idx = filedata->strindex[cnt];
 110       if (__glibc_unlikely (idx > (size_t) newdata->filesize))
 111         {
 112         puntdata:
 113           free (newdata);
 114           __set_errno (EINVAL);
 115           return NULL;
 116         }
 117
 118       /* Determine the type.  There is one special case: the LC_CTYPE
 119          category can have more elements than there are in the
 120          _nl_value_type_LC_XYZ array.  There are all pointers.  */
 121       switch (category)
 122         {
 123 #define CATTEST(cat) \
 124         case LC_##cat:                                                        \
 125           assert (cnt < (sizeof (_nl_value_type_LC_##cat)                     \
 126                          / sizeof (_nl_value_type_LC_##cat[0])));             \
 127           break
 128           CATTEST (NUMERIC);
 129           CATTEST (TIME);
 130           CATTEST (COLLATE);
 131           CATTEST (MONETARY);
 132           CATTEST (MESSAGES);
 133           CATTEST (PAPER);
 134           CATTEST (NAME);
 135           CATTEST (ADDRESS);
 136           CATTEST (TELEPHONE);
 137           CATTEST (MEASUREMENT);
 138           CATTEST (IDENTIFICATION);
 139         default:
 140           assert (category == LC_CTYPE);
 141           break;
 142         }
 143
 144       if ((category == LC_CTYPE
 145            && cnt >= (sizeof (_nl_value_type_LC_CTYPE)
 146                       / sizeof (_nl_value_type_LC_CTYPE[0])))
 147           || __builtin_expect (_nl_value_types[category][cnt] != word, 1))
 148         newdata->values[cnt].string = newdata->filedata + idx;
 149       else
 150         {
 151           if (!LOCFILE_ALIGNED_P (idx))
 152             goto puntdata;
 153           newdata->values[cnt].word =
 154             *((const u_int32_t *) (newdata->filedata + idx));
 155         }
 156     }
 157
 158   return newdata;
 159 }
 160
 161 void
 162 internal_function
 163 _nl_load_locale (struct loaded_l10nfile *file, int category)
 164 {
 165   int fd;
 166   void *filedata;
 167   struct stat64 st;
 168   struct __locale_data *newdata;
 169   int save_err;
 170   int alloc = ld_mapped;
 171
 172   file->decided = 1;
 173   file->data = NULL;
 174
 175   fd = open_not_cancel_2 (file->filename, O_RDONLY | O_CLOEXEC);
 176   if (__builtin_expect (fd, 0) < 0)
 177     /* Cannot open the file.  */
 178     return;
 179
 180   if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
 181     {
 182     puntfd:
 183       close_not_cancel_no_status (fd);
 184       return;
 185     }
 186   if (__glibc_unlikely (S_ISDIR (st.st_mode)))
 187     {
 188       /* LOCALE/LC_foo is a directory; open LOCALE/LC_foo/SYS_LC_foo
 189            instead.  */
 190       char *newp;
 191       size_t filenamelen;
 192
 193       close_not_cancel_no_status (fd);
 194
 195       filenamelen = strlen (file->filename);
 196       newp = (char *) alloca (filenamelen
 197                               + 5 + _nl_category_name_sizes[category] + 1);
 198       __mempcpy (__mempcpy (__mempcpy (newp, file->filename, filenamelen),
 199                             "/SYS_", 5),
 200                  _nl_category_names.str + _nl_category_name_idxs[category],
 201                  _nl_category_name_sizes[category] + 1);
 202
 203       fd = open_not_cancel_2 (newp, O_RDONLY | O_CLOEXEC);
 204       if (__builtin_expect (fd, 0) < 0)
 205         return;
 206
 207       if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
 208         goto puntfd;
 209     }
 210
 211   /* Map in the file's data.  */
 212   save_err = errno;
 213 #ifdef _POSIX_MAPPED_FILES
 214 # ifndef MAP_COPY
 215   /* Linux seems to lack read-only copy-on-write.  */
 216 #  define MAP_COPY MAP_PRIVATE
 217 # endif
 218 # ifndef MAP_FILE
 219   /* Some systems do not have this flag; it is superfluous.  */
 220 #  define MAP_FILE 0
 221 # endif
 222   filedata = __mmap ((caddr_t) 0, st.st_size,
 223                      PROT_READ, MAP_FILE|MAP_COPY, fd, 0);
 224   if (__glibc_unlikely (filedata == MAP_FAILED))
 225     {
 226       filedata = NULL;
 227       if (__builtin_expect (errno, ENOSYS) == ENOSYS)
 228         {
 229 #endif  /* _POSIX_MAPPED_FILES */
 230           /* No mmap; allocate a buffer and read from the file.  */
 231           alloc = ld_malloced;
 232           filedata = malloc (st.st_size);
 233           if (filedata != NULL)
 234             {
 235               off_t to_read = st.st_size;
 236               ssize_t nread;
 237               char *p = (char *) filedata;
 238               while (to_read > 0)
 239                 {
 240                   nread = read_not_cancel (fd, p, to_read);
 241                   if (__builtin_expect (nread, 1) <= 0)
 242                     {
 243                       free (filedata);
 244                       if (nread == 0)
 245                         __set_errno (EINVAL); /* Bizarreness going on.  */
 246                       goto puntfd;
 247                     }
 248                   p += nread;
 249                   to_read -= nread;
 250                 }
 251               __set_errno (save_err);
 252             }
 253 #ifdef _POSIX_MAPPED_FILES
 254         }
 255     }
 256 #endif  /* _POSIX_MAPPED_FILES */
 257
 258   /* We have mapped the data, so we no longer need the descriptor.  */
 259   close_not_cancel_no_status (fd);
 260
 261   if (__glibc_unlikely (filedata == NULL))
 262     /* We failed to map or read the data.  */
 263     return;
 264
 265   newdata = _nl_intern_locale_data (category, filedata, st.st_size);
 266   if (__glibc_unlikely (newdata == NULL))
 267     /* Bad data.  */
 268     {
 269 #ifdef _POSIX_MAPPED_FILES
 270       if (alloc == ld_mapped)
 271         __munmap ((caddr_t) filedata, st.st_size);
 272 #endif
 273       return;
 274     }
 275
 276   /* _nl_intern_locale_data leaves us these fields to initialize.  */
 277   newdata->name = NULL; /* This will be filled if necessary in findlocale.c. */
 278   newdata->alloc = alloc;
 279
 280   file->data = newdata;
 281 }
 282
 283 void
 284 internal_function
 285 _nl_unload_locale (struct __locale_data *locale)
 286 {
 287   if (locale->private.cleanup)
 288     (*locale->private.cleanup) (locale);
 289
 290   switch (__builtin_expect (locale->alloc, ld_mapped))
 291     {
 292     case ld_malloced:
 293       free ((void *) locale->filedata);
 294       break;
 295     case ld_mapped:
 296 #ifdef _POSIX_MAPPED_FILES
 297       __munmap ((caddr_t) locale->filedata, locale->filesize);
 298       break;
 299 #endif
 300     case ld_archive:            /* Nothing to do.  */
 301       break;
 302     }
 303
 304   if (__builtin_expect (locale->alloc, ld_mapped) != ld_archive)
 305     free ((char *) locale->name);
 306
 307   free (locale);
 308 }