aboutsummaryrefslogtreecommitdiff
path: root/locale/loadlocale.c
blob: c762b77ed101a12af485396230cf0b091ada8df4 (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
/* Functions to read locale data files.
   Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

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

#include <errno.h>
#include <fcntl.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, b, c, d) \
  [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, b, c, d) \
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, b, c, d) \
  [category] = _nl_value_type_##category,
#include "categories.def"
#undef DEFINE_CATEGORY
};


void
_nl_load_locale (struct loaded_l10nfile *file, int category)
{
  int fd;
  struct
    {
      unsigned int magic;
      unsigned int nstrings;
      unsigned int strindex[0];
    } *filedata;
  struct stat st;
  struct locale_data *newdata;
  int save_err;
  int swap = 0;
  int mmaped = 1;
  size_t cnt;
  inline unsigned int SWAP (const unsigned int *inw)
    {
      const unsigned char *inc = (const unsigned char *) inw;
      if (!swap)
	return *inw;
      return (inc[3] << 24) | (inc[2] << 16) | (inc[1] << 8) | inc[0];
    }

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

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

  if (__fstat (fd, &st) < 0)
    goto puntfd;
  if (S_ISDIR (st.st_mode))
    {
      /* LOCALE/LC_foo is a directory; open LOCALE/LC_foo/SYS_LC_foo
           instead.  */
      char *newp;

      __close (fd);

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

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

      if (__fstat (fd, &st) < 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
# ifndef MAP_INHERIT
  /* Some systems might lack this; they lose.  */
#  define MAP_INHERIT 0
# endif
  filedata = (void *) __mmap ((caddr_t) 0, st.st_size, PROT_READ,
			      MAP_FILE|MAP_COPY|MAP_INHERIT, fd, 0);
  if ((void *) filedata != MAP_FAILED)
    {
      if (st.st_size < sizeof (*filedata))
	/* This cannot be a locale data file since it's too small.  */
	goto puntfd;
    }
  else
    {
      if (errno == ENOSYS)
	{
#endif	/* _POSIX_MAPPED_FILES */
	  /* No mmap; allocate a buffer and read from the file.  */
	  mmaped = 0;
	  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 (nread <= 0)
		    {
		      free (filedata);
		      if (nread == 0)
			__set_errno (EINVAL); /* Bizarreness going on.  */
		      goto puntfd;
		    }
		  p += nread;
		  to_read -= nread;
		}
	    }
	  else
	    goto puntfd;
	  __set_errno (save_err);
#ifdef _POSIX_MAPPED_FILES
	}
      else
	goto puntfd;
    }
#endif	/* _POSIX_MAPPED_FILES */

  if (filedata->magic == LIMAGIC (category))
    /* Good data file in our byte order.  */
    swap = 0;
  else
    {
      /* Try the other byte order.  */
      swap = 1;
      if (SWAP (&filedata->magic) != LIMAGIC (category))
	/* Bad data file in either byte order.  */
	{
	puntmap:
#ifdef _POSIX_MAPPED_FILES
	  if (mmaped)
	    __munmap ((caddr_t) filedata, st.st_size);
	  else
#endif	/* _POSIX_MAPPED_FILES */
	    free (filedata);
	puntfd:
	  __close (fd);
	  return;
	}
    }

#define W(word)	SWAP (&(word))

  if (W (filedata->nstrings) < _nl_category_num_items[category] ||
      (sizeof *filedata + W (filedata->nstrings) * sizeof (unsigned int)
       >= (size_t) st.st_size))
    {
      /* Insufficient data.  */
      __set_errno (EINVAL);
      goto puntmap;
    }

  newdata = malloc (sizeof *newdata +
		    (_nl_category_num_items[category]
		     * sizeof (union locale_data_value)));
  if (! newdata)
    goto puntmap;

  newdata->name = NULL;	/* This will be filled if necessary in findlocale.c. */
  newdata->filedata = (void *) filedata;
  newdata->filesize = st.st_size;
  newdata->mmaped = mmaped;
  newdata->usage_count = 0;
  newdata->nstrings = _nl_category_num_items[category];
  for (cnt = 0; cnt < newdata->nstrings; ++cnt)
    {
      off_t idx = W (filedata->strindex[cnt]);
      if (idx >= newdata->filesize)
	{
	  free (newdata);
	  __set_errno (EINVAL);
	  goto puntmap;
	}
      if (_nl_value_types[category][cnt] == word)
	newdata->values[cnt].word = W (*((u_int32_t *) (newdata->filedata
							+ idx)));
      else
	newdata->values[cnt].string = newdata->filedata + idx;
    }

  __close (fd);
  file->data = newdata;
}

void
_nl_unload_locale (struct locale_data *locale)
{
  if (locale->name != NULL)
    free ((void *) locale->name);

#ifdef _POSIX_MAPPED_FILES
  if (locale->mmaped)
    __munmap ((caddr_t) locale->filedata, locale->filesize);
  else
#endif
    free ((void *) locale->filedata);

  free (locale);
}