aboutsummaryrefslogtreecommitdiff
path: root/locale/loadlocale.c
blob: 14f3773c47f45b416660d5f886a214913e1b5fcb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
/* Functions to read locale data files.
   Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef _POSIX_MAPPED_FILES
# include <sys/mman.h>
#endif
#include <sys/stat.h>

#include "localeinfo.h"


static const size_t _nl_category_num_items[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a) \
  [category] = _NL_ITEM_INDEX (_NL_NUM_##category),
#include "categories.def"
#undef	DEFINE_CATEGORY
};


#define NO_PAREN(arg, rest...) arg, ##rest

#define DEFINE_CATEGORY(category, category_name, items, a) \
static const enum value_type _nl_value_type_##category[] = { NO_PAREN items };
#define DEFINE_ELEMENT(element, element_name, optstd, type, rest...) \
  [_NL_ITEM_INDEX (element)] = type,
#include "categories.def"
#undef DEFINE_CATEGORY

static const enum value_type *_nl_value_types[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a) \
  [category] = _nl_value_type_##category,
#include "categories.def"
#undef DEFINE_CATEGORY
};


struct locale_data *
internal_function
_nl_intern_locale_data (int category, const void *data, size_t datasize)
{
  const struct
    {
      unsigned int magic;
      unsigned int nstrings;
      unsigned int strindex[0];
    } *const filedata = data;
  struct locale_data *newdata;
  size_t cnt;

  if (__builtin_expect (datasize < sizeof *filedata, 0)
      || __builtin_expect (filedata->magic != LIMAGIC (category), 0))
    {
      /* Bad data file.  */
      __set_errno (EINVAL);
      return NULL;
    }

  if (__builtin_expect (filedata->nstrings < _nl_category_num_items[category],
			0)
      || (__builtin_expect (sizeof *filedata
			    + filedata->nstrings * sizeof (unsigned int)
			    >= datasize, 0)))
    {
      /* Insufficient data.  */
      __set_errno (EINVAL);
      return NULL;
    }

  newdata = malloc (sizeof *newdata
		    + filedata->nstrings * sizeof (union locale_data_value));
  if (newdata == NULL)
    return NULL;

  newdata->filedata = (void *) filedata;
  newdata->filesize = datasize;
  newdata->usage_count = 0;
  newdata->use_translit = 0;
  newdata->nstrings = filedata->nstrings;
  for (cnt = 0; cnt < newdata->nstrings; ++cnt)
    {
      size_t idx = filedata->strindex[cnt];
      if (__builtin_expect (idx > newdata->filesize, 0))
	{
	puntdata:
	  free (newdata);
	  __set_errno (EINVAL);
	  return NULL;
	}
      if (__builtin_expect (_nl_value_types[category][cnt] == word, 0))
	{
	  if (idx % __alignof__ (u_int32_t) != 0)
	    goto puntdata;
	  newdata->values[cnt].word =
	    *((const u_int32_t *) (newdata->filedata + idx));
	}
      else
	newdata->values[cnt].string = newdata->filedata + idx;
    }

  return newdata;
}

void
internal_function
_nl_load_locale (struct loaded_l10nfile *file, int category)
{
  int fd;
  void *filedata;
  struct stat64 st;
  struct locale_data *newdata;
  int save_err;
  int alloc = ld_mapped;

  file->decided = 1;
  file->data = NULL;

  fd = __open (file->filename, O_RDONLY);
  if (__builtin_expect (fd, 0) < 0)
    /* Cannot open the file.  */
    return;

  if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
    {
    puntfd:
      __close (fd);
      return;
    }
  if (__builtin_expect (S_ISDIR (st.st_mode), 0))
    {
      /* LOCALE/LC_foo is a directory; open LOCALE/LC_foo/SYS_LC_foo
           instead.  */
      char *newp;
      size_t filenamelen;

      __close (fd);

      filenamelen = strlen (file->filename);
      newp = (char *) alloca (filenamelen
			      + 5 + _nl_category_name_sizes[category] + 1);
      __mempcpy (__mempcpy (__mempcpy (newp, file->filename, filenamelen),
			    "/SYS_", 5),
		 _nl_category_names[category],
		 _nl_category_name_sizes[category] + 1);

      fd = __open (newp, O_RDONLY);
      if (__builtin_expect (fd, 0) < 0)
	return;

      if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
	goto puntfd;
    }

  /* Map in the file's data.  */
  save_err = errno;
#ifdef _POSIX_MAPPED_FILES
# ifndef MAP_COPY
  /* Linux seems to lack read-only copy-on-write.  */
#  define MAP_COPY MAP_PRIVATE
# endif
# ifndef MAP_FILE
  /* Some systems do not have this flag; it is superfluous.  */
#  define MAP_FILE 0
# endif
  filedata = __mmap ((caddr_t) 0, st.st_size,
		     PROT_READ, MAP_FILE|MAP_COPY, fd, 0);
  if (__builtin_expect (filedata == MAP_FAILED, 0))
    {
      if (__builtin_expect (errno, ENOSYS) == ENOSYS)
	{
#endif	/* _POSIX_MAPPED_FILES */
	  /* No mmap; allocate a buffer and read from the file.  */
	  alloc = ld_malloced;
	  filedata = malloc (st.st_size);
	  if (filedata != NULL)
	    {
	      off_t to_read = st.st_size;
	      ssize_t nread;
	      char *p = (char *) filedata;
	      while (to_read > 0)
		{
		  nread = __read (fd, p, to_read);
		  if (__builtin_expect (nread, 1) <= 0)
		    {
		      free (filedata);
		      if (nread == 0)
			__set_errno (EINVAL); /* Bizarreness going on.  */
		      goto puntfd;
		    }
		  p += nread;
		  to_read -= nread;
		}
	      __set_errno (save_err);
	    }
#ifdef _POSIX_MAPPED_FILES
	}
    }
#endif	/* _POSIX_MAPPED_FILES */

  /* We have mapped the data, so we no longer need the descriptor.  */
  __close (fd);

  if (__builtin_expect (filedata == NULL, 0))
    /* We failed to map or read the data.  */
    return;

  newdata = _nl_intern_locale_data (category, filedata, st.st_size);
  if (__builtin_expect (newdata == NULL, 0))
    /* Bad data.  */
    {
#ifdef _POSIX_MAPPED_FILES
      if (alloc == ld_mapped)
	__munmap ((caddr_t) filedata, st.st_size);
#endif
      return;
    }

  /* _nl_intern_locale_data leaves us these fields to initialize.  */
  newdata->name = NULL;	/* This will be filled if necessary in findlocale.c. */
  newdata->alloc = alloc;

  file->data = newdata;
}

void
internal_function
_nl_unload_locale (struct locale_data *locale)
{
  switch (__builtin_expect (locale->alloc, ld_mapped))
    {
    case ld_malloced:
      free ((void *) locale->filedata);
      break;
    case ld_mapped:
#ifdef _POSIX_MAPPED_FILES
      __munmap ((caddr_t) locale->filedata, locale->filesize);
      break;
#endif
    case ld_archive:		/* Nothing to do.  */
      break;
    }

  if (__builtin_expect (locale->alloc, ld_mapped) != ld_archive)
    free ((char *) locale->name);

  free (locale);
}