locale/loadlocale.c

   1 /* Functions to read locale data files.
   2    Copyright (C) 1996, 1997, 1998, 1999, 2000 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 #ifdef _POSIX_MAPPED_FILES
  27 # include <sys/mman.h>
  28 #endif
  29 #include <sys/stat.h>
  30
  31 #include "localeinfo.h"
  32
  33
  34 static const size_t _nl_category_num_items[] =
  35 {
  36 #define DEFINE_CATEGORY(category, category_name, items, a) \
  37   [category] = _NL_ITEM_INDEX (_NL_NUM_##category),
  38 #include "categories.def"
  39 #undef  DEFINE_CATEGORY
  40 };
  41
  42
  43 #define NO_PAREN(arg, rest...) arg, ##rest
  44
  45 #define DEFINE_CATEGORY(category, category_name, items, a) \
  46 static const enum value_type _nl_value_type_##category[] = { NO_PAREN items };
  47 #define DEFINE_ELEMENT(element, element_name, optstd, type, rest...) \
  48   [_NL_ITEM_INDEX (element)] = type,
  49 #include "categories.def"
  50 #undef DEFINE_CATEGORY
  51
  52 static const enum value_type *_nl_value_types[] =
  53 {
  54 #define DEFINE_CATEGORY(category, category_name, items, a) \
  55   [category] = _nl_value_type_##category,
  56 #include "categories.def"
  57 #undef DEFINE_CATEGORY
  58 };
  59
  60
  61 void
  62 _nl_load_locale (struct loaded_l10nfile *file, int category)
  63 {
  64   int fd;
  65   struct
  66     {
  67       unsigned int magic;
  68       unsigned int nstrings;
  69       unsigned int strindex[0];
  70     } *filedata;
  71   struct stat st;
  72   struct locale_data *newdata;
  73   int save_err;
  74   int mmaped = 1;
  75   size_t cnt;
  76
  77   file->decided = 1;
  78   file->data = NULL;
  79
  80   fd = __open (file->filename, O_RDONLY);
  81   if (__builtin_expect (fd, 0) < 0)
  82     /* Cannot open the file.  */
  83     return;
  84
  85   if (__builtin_expect (__fstat (fd, &st), 0) < 0)
  86     goto puntfd;
  87   if (__builtin_expect (S_ISDIR (st.st_mode), 0))
  88     {
  89       /* LOCALE/LC_foo is a directory; open LOCALE/LC_foo/SYS_LC_foo
  90            instead.  */
  91       char *newp;
  92       size_t filenamelen;
  93
  94       __close (fd);
  95
  96       filenamelen = strlen (file->filename);
  97       newp = (char *) alloca (filenamelen
  98                               + 5 + _nl_category_name_sizes[category] + 1);
  99       __mempcpy (__mempcpy (__mempcpy (newp, file->filename, filenamelen),
 100                             "/SYS_", 5),
 101                  _nl_category_names[category],
 102                  _nl_category_name_sizes[category] + 1);
 103
 104       fd = __open (newp, O_RDONLY);
 105       if (__builtin_expect (fd, 0) < 0)
 106         return;
 107
 108       if (__builtin_expect (__fstat (fd, &st), 0) < 0)
 109         goto puntfd;
 110     }
 111
 112   /* Map in the file's data.  */
 113   save_err = errno;
 114 #ifdef _POSIX_MAPPED_FILES
 115 # ifndef MAP_COPY
 116   /* Linux seems to lack read-only copy-on-write.  */
 117 #  define MAP_COPY MAP_PRIVATE
 118 # endif
 119 # ifndef MAP_FILE
 120   /* Some systems do not have this flag; it is superfluous.  */
 121 #  define MAP_FILE 0
 122 # endif
 123 # ifndef MAP_INHERIT
 124   /* Some systems might lack this; they lose.  */
 125 #  define MAP_INHERIT 0
 126 # endif
 127   filedata = (void *) __mmap ((caddr_t) 0, st.st_size, PROT_READ,
 128                               MAP_FILE|MAP_COPY|MAP_INHERIT, fd, 0);
 129   if (__builtin_expect ((void *) filedata != MAP_FAILED, 1))
 130     {
 131       if (__builtin_expect (st.st_size < sizeof (*filedata), 0))
 132         /* This cannot be a locale data file since it's too small.  */
 133         goto puntfd;
 134     }
 135   else
 136     {
 137       if (__builtin_expect (errno, ENOSYS) == ENOSYS)
 138         {
 139 #endif  /* _POSIX_MAPPED_FILES */
 140           /* No mmap; allocate a buffer and read from the file.  */
 141           mmaped = 0;
 142           filedata = malloc (st.st_size);
 143           if (filedata != NULL)
 144             {
 145               off_t to_read = st.st_size;
 146               ssize_t nread;
 147               char *p = (char *) filedata;
 148               while (to_read > 0)
 149                 {
 150                   nread = __read (fd, p, to_read);
 151                   if (__builtin_expect (nread, 1) <= 0)
 152                     {
 153                       free (filedata);
 154                       if (nread == 0)
 155                         __set_errno (EINVAL); /* Bizarreness going on.  */
 156                       goto puntfd;
 157                     }
 158                   p += nread;
 159                   to_read -= nread;
 160                 }
 161             }
 162           else
 163             goto puntfd;
 164           __set_errno (save_err);
 165 #ifdef _POSIX_MAPPED_FILES
 166         }
 167       else
 168         goto puntfd;
 169     }
 170 #endif  /* _POSIX_MAPPED_FILES */
 171
 172   if (__builtin_expect (filedata->magic != LIMAGIC (category), 0))
 173     /* Bad data file in either byte order.  */
 174     {
 175     puntmap:
 176 #ifdef _POSIX_MAPPED_FILES
 177       __munmap ((caddr_t) filedata, st.st_size);
 178 #endif
 179     puntfd:
 180       __close (fd);
 181       return;
 182     }
 183
 184   if (__builtin_expect (filedata->nstrings < _nl_category_num_items[category],
 185                         0)
 186       || (__builtin_expect (sizeof *filedata
 187                             + filedata->nstrings * sizeof (unsigned int)
 188                             >= (size_t) st.st_size, 0)))
 189     {
 190       /* Insufficient data.  */
 191       __set_errno (EINVAL);
 192       goto puntmap;
 193     }
 194
 195   newdata = malloc (sizeof *newdata
 196                     + filedata->nstrings * sizeof (union locale_data_value));
 197   if (newdata == NULL)
 198     goto puntmap;
 199
 200   newdata->name = NULL; /* This will be filled if necessary in findlocale.c. */
 201   newdata->filedata = (void *) filedata;
 202   newdata->filesize = st.st_size;
 203   newdata->mmaped = mmaped;
 204   newdata->usage_count = 0;
 205   newdata->nstrings = filedata->nstrings;
 206   for (cnt = 0; cnt < newdata->nstrings; ++cnt)
 207     {
 208       off_t idx = filedata->strindex[cnt];
 209       if (__builtin_expect (idx > newdata->filesize, 0))
 210         {
 211           free (newdata);
 212           __set_errno (EINVAL);
 213           goto puntmap;
 214         }
 215       if (__builtin_expect (_nl_value_types[category][cnt] == word, 0))
 216         newdata->values[cnt].word = *((u_int32_t *) (newdata->filedata + idx));
 217       else
 218         newdata->values[cnt].string = newdata->filedata + idx;
 219     }
 220
 221   __close (fd);
 222   file->data = newdata;
 223 }
 224
 225 void
 226 _nl_unload_locale (struct locale_data *locale)
 227 {
 228 #ifdef _POSIX_MAPPED_FILES
 229   if (__builtin_expect (locale->mmaped, 1))
 230     __munmap ((caddr_t) locale->filedata, locale->filesize);
 231   else
 232 #endif
 233     free ((void *) locale->filedata);
 234
 235   free (locale);
 236 }