summaryrefslogtreecommitdiff
path: root/locale/newlocale.c
blob: d4e184b92181ced0b0a98e6a672199a08a79e4d1 (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
/* Return a reference to locale information record.
   Copyright (C) 1996, 1997 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 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 <argz.h>
#include <errno.h>
#include <locale.h>
#include <stdlib.h>

#include "localeinfo.h"


/* Constant data defined in setlocale.c.  */
extern struct locale_data *const _nl_C[];

/* Use this when we come along an error.  */
#define ERROR_RETURN							      \
  do {									      \
    __set_errno (EINVAL);						      \
    return NULL;							      \
  } while (0)


__locale_t
__newlocale (int category_mask, const char *locale, __locale_t base)
{
  /* Intermediate memory for result.  */
  const char *newnames[LC_ALL];
  struct __locale_t result;
  __locale_t result_ptr;
  char *locale_path;
  size_t locale_path_len;
  const char *locpath_var;
  int cnt;

  /* We treat LC_ALL in the same way as if all bits were set.  */
  if (category_mask == LC_ALL)
    category_mask = (1 << LC_ALL) - 1;

  /* Sanity check for CATEGORY argument.  */
  if ((category_mask & ~(1 << LC_ALL) - 1) != 0)
    ERROR_RETURN;

  /* `newlocale' does not support asking for the locale name. */
  if (locale == NULL)
    ERROR_RETURN;

  /* Allocate memory for the result.  */
  if (base != NULL)
    {
      if (base != NULL)
	return base;

      result = *base;
    }
  else
    {
      /* Fill with pointers to C locale data to .  */
      for (cnt = 0; cnt < LC_ALL; ++cnt)
	result.__locales[cnt] = _nl_C[cnt];

      /* If no category is to be set we return BASE if available or a
	 dataset using the C locale data.  */
      if (category_mask == 0)
	{
	  result_ptr = (__locale_t) malloc (sizeof (struct __locale_t));
	  *result_ptr = result;

	  goto update;
	}
    }

  /* We perhaps really have to load some data.  So we determine the
     path in which to look for the data now.  The environment variable
     `LOCPATH' must only be used when the binary has no SUID or SGID
     bit set.  */
  locale_path = NULL;
  locale_path_len = 0;

  locpath_var = __secure_getenv ("LOCPATH");
  if (locpath_var != NULL && locpath_var[0] != '\0')
    if (__argz_create_sep (locpath_var, ':',
			   &locale_path, &locale_path_len) != 0)
      return NULL;

  if (__argz_append (&locale_path, &locale_path_len,
		     LOCALE_PATH, sizeof (LOCALE_PATH)) != 0)
    return NULL;

  /* Get the names for the locales we are interested in.  We either
     allow a composite name or a single name.  */
  for (cnt = 0; cnt < LC_ALL; ++cnt)
    newnames[cnt] = locale;
  if (strchr (locale, ';') != NULL)
    {
      /* This is a composite name.  Make a copy and split it up.  */
      char *np = strdupa (locale);
      char *cp;

      while ((cp = strchr (np, '=')) != NULL)
	{
	  for (cnt = 0; cnt < LC_ALL; ++cnt)
	    if ((size_t) (cp - np) == _nl_category_name_sizes[cnt]
		&& memcmp (np, _nl_category_names[cnt], cp - np) == 0)
	      break;

	  if (cnt == LC_ALL)
	    /* Bogus category name.  */
	    ERROR_RETURN;

	  /* Found the category this clause sets.  */
	  newnames[cnt] = ++cp;
	  cp = strchr (cp, ';');
	  if (cp != NULL)
	    {
	      /* Examine the next clause.  */
	      *cp = '\0';
	      np = cp + 1;
	    }
	  else
	    /* This was the last clause.  We are done.  */
	    break;
	}

      for (cnt = 0; cnt < LC_ALL; ++cnt)
	if ((category_mask & 1 << cnt) != 0 && newnames[cnt] == locale)
	  /* The composite name did not specify the category we need.  */
	  ERROR_RETURN;
    }

  /* Now process all categories we are interested in.  */
  for (cnt = 0; cnt < LC_ALL; ++cnt)
    if ((category_mask & 1 << cnt) != 0)
      {
	result.__locales[cnt] = _nl_find_locale (locale_path, locale_path_len,
						 cnt, &newnames[cnt]);
	if (result.__locales[cnt] == NULL)
	  return NULL;
      }

  /* We successfully loaded all required data.  */
  if (base == NULL)
    {
      /* Allocate new structure.  */
      result_ptr = (__locale_t) malloc (sizeof (struct __locale_t));
      if (result_ptr == NULL)
	return NULL;

      *result_ptr = result;
    }
  else
    *(result_ptr = base) = result;

  /* Update the special members.  */
 update:
  {
    union locale_data_value *ctypes = result_ptr->__locales[LC_CTYPE]->values;
  result_ptr->__ctype_b = (const unsigned short int *)
    (ctypes[_NL_ITEM_INDEX (_NL_CTYPE_CLASS)] .string);
#if BYTE_ORDER == BIG_ENDIAN
  result_ptr->__ctype_tolower = (const int *)
    (ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOLOWER_EB)].string);
  result_ptr->__ctype_toupper = (const int *)
    (ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOUPPER_EB)].string);
#elif BYTE_ORDER == LITTLE_ENDIAN
  result_ptr->__ctype_tolower = (const int *)
    (ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOLOWER_EL)].string);
  result_ptr->__ctype_toupper = (const int *)
    (ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOUPPER_EL)].string);
#else
#error bizarre byte order
#endif
  }

  return result_ptr;
}