1/* Return a reference to locale information record.
2 Copyright (C) 1996-2017 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 <argz.h>
21#include <libc-lock.h>
22#include <errno.h>
23#include <locale.h>
24#include <stdlib.h>
25#include <string.h>
26
27#include "localeinfo.h"
28
29
30/* Lock for protecting global data. */
31__libc_rwlock_define (extern , __libc_setlocale_lock attribute_hidden)
32
33
34/* Use this when we come along an error. */
35#define ERROR_RETURN \
36 do { \
37 __set_errno (EINVAL); \
38 return NULL; \
39 } while (0)
40
41
42__locale_t
43__newlocale (int category_mask, const char *locale, __locale_t base)
44{
45 /* Intermediate memory for result. */
46 const char *newnames[__LC_LAST];
47 struct __locale_struct result;
48 __locale_t result_ptr;
49 char *locale_path;
50 size_t locale_path_len;
51 const char *locpath_var;
52 int cnt;
53 size_t names_len;
54
55 /* We treat LC_ALL in the same way as if all bits were set. */
56 if (category_mask == 1 << LC_ALL)
57 category_mask = (1 << __LC_LAST) - 1 - (1 << LC_ALL);
58
59 /* Sanity check for CATEGORY argument. */
60 if ((category_mask & ~((1 << __LC_LAST) - 1 - (1 << LC_ALL))) != 0)
61 ERROR_RETURN;
62
63 /* `newlocale' does not support asking for the locale name. */
64 if (locale == NULL)
65 ERROR_RETURN;
66
67 if (base == _nl_C_locobj_ptr)
68 /* We're to modify BASE, returned for a previous call with "C".
69 We can't really modify the read-only structure, so instead
70 start over by copying it. */
71 base = NULL;
72
73 if ((base == NULL || category_mask == (1 << __LC_LAST) - 1 - (1 << LC_ALL))
74 && (category_mask == 0 || !strcmp (locale, "C")))
75 /* Asking for the "C" locale needn't allocate a new object. */
76 return _nl_C_locobj_ptr;
77
78 /* Allocate memory for the result. */
79 if (base != NULL)
80 result = *base;
81 else
82 /* Fill with pointers to C locale data. */
83 result = _nl_C_locobj;
84
85 /* If no category is to be set we return BASE if available or a
86 dataset using the C locale data. */
87 if (category_mask == 0)
88 {
89 result_ptr = (__locale_t) malloc (sizeof (struct __locale_struct));
90 if (result_ptr == NULL)
91 return NULL;
92 *result_ptr = result;
93
94 goto update;
95 }
96
97 /* We perhaps really have to load some data. So we determine the
98 path in which to look for the data now. The environment variable
99 `LOCPATH' must only be used when the binary has no SUID or SGID
100 bit set. If using the default path, we tell _nl_find_locale
101 by passing null and it can check the canonical locale archive. */
102 locale_path = NULL;
103 locale_path_len = 0;
104
105 locpath_var = getenv ("LOCPATH");
106 if (locpath_var != NULL && locpath_var[0] != '\0')
107 {
108 if (__argz_create_sep (locpath_var, ':',
109 &locale_path, &locale_path_len) != 0)
110 return NULL;
111
112 if (__argz_add_sep (&locale_path, &locale_path_len,
113 _nl_default_locale_path, ':') != 0)
114 return NULL;
115 }
116
117 /* Get the names for the locales we are interested in. We either
118 allow a composite name or a single name. */
119 for (cnt = 0; cnt < __LC_LAST; ++cnt)
120 if (cnt != LC_ALL)
121 newnames[cnt] = locale;
122 if (strchr (locale, ';') != NULL)
123 {
124 /* This is a composite name. Make a copy and split it up. */
125 char *np = strdupa (locale);
126 char *cp;
127 int specified_mask = 0;
128
129 while ((cp = strchr (np, '=')) != NULL)
130 {
131 for (cnt = 0; cnt < __LC_LAST; ++cnt)
132 if (cnt != LC_ALL
133 && (size_t) (cp - np) == _nl_category_name_sizes[cnt]
134 && memcmp (np, (_nl_category_names.str
135 + _nl_category_name_idxs[cnt]), cp - np) == 0)
136 break;
137
138 if (cnt == __LC_LAST)
139 /* Bogus category name. */
140 ERROR_RETURN;
141
142 /* Found the category this clause sets. */
143 specified_mask |= 1 << cnt;
144 newnames[cnt] = ++cp;
145 cp = strchr (cp, ';');
146 if (cp != NULL)
147 {
148 /* Examine the next clause. */
149 *cp = '\0';
150 np = cp + 1;
151 }
152 else
153 /* This was the last clause. We are done. */
154 break;
155 }
156
157 if (category_mask &~ specified_mask)
158 /* The composite name did not specify all categories we need. */
159 ERROR_RETURN;
160 }
161
162 /* Protect global data. */
163 __libc_rwlock_wrlock (__libc_setlocale_lock);
164
165 /* Now process all categories we are interested in. */
166 names_len = 0;
167 for (cnt = 0; cnt < __LC_LAST; ++cnt)
168 {
169 if ((category_mask & 1 << cnt) != 0)
170 {
171 result.__locales[cnt] = _nl_find_locale (locale_path,
172 locale_path_len,
173 cnt, &newnames[cnt]);
174 if (result.__locales[cnt] == NULL)
175 {
176 free_cnt_data_and_exit:
177 while (cnt-- > 0)
178 if (((category_mask & 1 << cnt) != 0)
179 && result.__locales[cnt]->usage_count != UNDELETABLE)
180 /* We can remove the data. */
181 _nl_remove_locale (cnt, result.__locales[cnt]);
182
183 /* Critical section left. */
184 __libc_rwlock_unlock (__libc_setlocale_lock);
185 return NULL;
186 }
187
188 if (newnames[cnt] != _nl_C_name)
189 names_len += strlen (newnames[cnt]) + 1;
190 }
191 else if (cnt != LC_ALL && result.__names[cnt] != _nl_C_name)
192 /* Tally up the unchanged names from BASE as well. */
193 names_len += strlen (result.__names[cnt]) + 1;
194 }
195
196 /* We successfully loaded all required data. Allocate a new structure.
197 We can't just reuse the BASE pointer, because the name strings are
198 changing and we need the old name string area intact so we can copy
199 out of it into the new one without overlap problems should some
200 category's name be getting longer. */
201 result_ptr = malloc (sizeof (struct __locale_struct) + names_len);
202 if (result_ptr == NULL)
203 {
204 cnt = __LC_LAST;
205 goto free_cnt_data_and_exit;
206 }
207
208 if (base == NULL)
209 {
210 /* Fill in this new structure from scratch. */
211
212 char *namep = (char *) (result_ptr + 1);
213
214 /* Install copied new names in the new structure's __names array.
215 If resolved to "C", that is already in RESULT.__names to start. */
216 for (cnt = 0; cnt < __LC_LAST; ++cnt)
217 if ((category_mask & 1 << cnt) != 0 && newnames[cnt] != _nl_C_name)
218 {
219 result.__names[cnt] = namep;
220 namep = __stpcpy (namep, newnames[cnt]) + 1;
221 }
222
223 *result_ptr = result;
224 }
225 else
226 {
227 /* We modify the base structure. */
228
229 char *namep = (char *) (result_ptr + 1);
230
231 for (cnt = 0; cnt < __LC_LAST; ++cnt)
232 if ((category_mask & 1 << cnt) != 0)
233 {
234 if (base->__locales[cnt]->usage_count != UNDELETABLE)
235 /* We can remove the old data. */
236 _nl_remove_locale (cnt, base->__locales[cnt]);
237 result_ptr->__locales[cnt] = result.__locales[cnt];
238
239 if (newnames[cnt] == _nl_C_name)
240 result_ptr->__names[cnt] = _nl_C_name;
241 else
242 {
243 result_ptr->__names[cnt] = namep;
244 namep = __stpcpy (namep, newnames[cnt]) + 1;
245 }
246 }
247 else if (cnt != LC_ALL)
248 {
249 /* The RESULT members point into the old BASE structure. */
250 result_ptr->__locales[cnt] = result.__locales[cnt];
251 if (result.__names[cnt] == _nl_C_name)
252 result_ptr->__names[cnt] = _nl_C_name;
253 else
254 {
255 result_ptr->__names[cnt] = namep;
256 namep = __stpcpy (namep, result.__names[cnt]) + 1;
257 }
258 }
259
260 free (base);
261 }
262
263 /* Critical section left. */
264 __libc_rwlock_unlock (__libc_setlocale_lock);
265
266 /* Update the special members. */
267 update:
268 {
269 union locale_data_value *ctypes = result_ptr->__locales[LC_CTYPE]->values;
270 result_ptr->__ctype_b = (const unsigned short int *)
271 ctypes[_NL_ITEM_INDEX (_NL_CTYPE_CLASS)].string + 128;
272 result_ptr->__ctype_tolower = (const int *)
273 ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOLOWER)].string + 128;
274 result_ptr->__ctype_toupper = (const int *)
275 ctypes[_NL_ITEM_INDEX (_NL_CTYPE_TOUPPER)].string + 128;
276 }
277
278 return result_ptr;
279}
280weak_alias (__newlocale, newlocale)
281