1/* Copyright (C) 1998-2017 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <ctype.h>
20#include <langinfo.h>
21#include <limits.h>
22#include <stdlib.h>
23#include <string.h>
24
25#include <locale/localeinfo.h>
26#include <wcsmbsload.h>
27#include <libc-lock.h>
28
29
30/* These are the descriptions for the default conversion functions. */
31static const struct __gconv_step to_wc =
32{
33 .__shlib_handle = NULL,
34 .__modname = NULL,
35 .__counter = INT_MAX,
36 .__from_name = (char *) "ANSI_X3.4-1968//TRANSLIT",
37 .__to_name = (char *) "INTERNAL",
38 .__fct = __gconv_transform_ascii_internal,
39 .__btowc_fct = __gconv_btwoc_ascii,
40 .__init_fct = NULL,
41 .__end_fct = NULL,
42 .__min_needed_from = 1,
43 .__max_needed_from = 1,
44 .__min_needed_to = 4,
45 .__max_needed_to = 4,
46 .__stateful = 0,
47 .__data = NULL
48};
49
50static const struct __gconv_step to_mb =
51{
52 .__shlib_handle = NULL,
53 .__modname = NULL,
54 .__counter = INT_MAX,
55 .__from_name = (char *) "INTERNAL",
56 .__to_name = (char *) "ANSI_X3.4-1968//TRANSLIT",
57 .__fct = __gconv_transform_internal_ascii,
58 .__btowc_fct = NULL,
59 .__init_fct = NULL,
60 .__end_fct = NULL,
61 .__min_needed_from = 4,
62 .__max_needed_from = 4,
63 .__min_needed_to = 1,
64 .__max_needed_to = 1,
65 .__stateful = 0,
66 .__data = NULL
67};
68
69
70/* For the default locale we only have to handle ANSI_X3.4-1968. */
71const struct gconv_fcts __wcsmbs_gconv_fcts_c =
72{
73 .towc = (struct __gconv_step *) &to_wc,
74 .towc_nsteps = 1,
75 .tomb = (struct __gconv_step *) &to_mb,
76 .tomb_nsteps = 1,
77};
78
79
80attribute_hidden
81struct __gconv_step *
82__wcsmbs_getfct (const char *to, const char *from, size_t *nstepsp)
83{
84 size_t nsteps;
85 struct __gconv_step *result;
86#if 0
87 size_t nstateful;
88 size_t cnt;
89#endif
90
91 if (__gconv_find_transform (to, from, &result, &nsteps, 0) != __GCONV_OK)
92 /* Loading the conversion step is not possible. */
93 return NULL;
94
95 /* Maybe it is someday necessary to allow more than one step.
96 Currently this is not the case since the conversions handled here
97 are from and to INTERNAL and there always is a converted for
98 that. It the directly following code is enabled the libio
99 functions will have to allocate appropriate __gconv_step_data
100 elements instead of only one. */
101#if 0
102 /* Count the number of stateful conversions. Since we will only
103 have one 'mbstate_t' object available we can only deal with one
104 stateful conversion. */
105 nstateful = 0;
106 for (cnt = 0; cnt < nsteps; ++cnt)
107 if (result[cnt].__stateful)
108 ++nstateful;
109 if (nstateful > 1)
110#else
111 if (nsteps > 1)
112#endif
113 {
114 /* We cannot handle this case. */
115 __gconv_close_transform (result, nsteps);
116 result = NULL;
117 }
118 else
119 *nstepsp = nsteps;
120
121 return result;
122}
123
124
125/* Extract from the given locale name the character set portion. Since
126 only the XPG form of the name includes this information we don't have
127 to take care for the CEN form. */
128#define extract_charset_name(str) \
129 ({ \
130 const char *cp = str; \
131 char *result = NULL; \
132 \
133 cp += strcspn (cp, "@.+,"); \
134 if (*cp == '.') \
135 { \
136 const char *endp = ++cp; \
137 while (*endp != '\0' && *endp != '@') \
138 ++endp; \
139 if (endp != cp) \
140 result = strndupa (cp, endp - cp); \
141 } \
142 result; \
143 })
144
145
146/* Some of the functions here must not be used while setlocale is called. */
147__libc_rwlock_define (extern, __libc_setlocale_lock attribute_hidden)
148
149/* Load conversion functions for the currently selected locale. */
150void
151internal_function
152__wcsmbs_load_conv (struct __locale_data *new_category)
153{
154 /* Acquire the lock. */
155 __libc_rwlock_wrlock (__libc_setlocale_lock);
156
157 /* We should repeat the test since while we waited some other thread
158 might have run this function. */
159 if (__glibc_likely (new_category->private.ctype == NULL))
160 {
161 /* We must find the real functions. */
162 const char *charset_name;
163 const char *complete_name;
164 struct gconv_fcts *new_fcts;
165 int use_translit;
166
167 /* Allocate the gconv_fcts structure. */
168 new_fcts = calloc (1, sizeof *new_fcts);
169 if (new_fcts == NULL)
170 goto failed;
171
172 /* Get name of charset of the locale. */
173 charset_name = new_category->values[_NL_ITEM_INDEX(CODESET)].string;
174
175 /* Does the user want transliteration? */
176 use_translit = new_category->use_translit;
177
178 /* Normalize the name and add the slashes necessary for a
179 complete lookup. */
180 complete_name = norm_add_slashes (charset_name,
181 use_translit ? "TRANSLIT" : "");
182
183 /* It is not necessary to use transliteration in this direction
184 since the internal character set is supposed to be able to
185 represent all others. */
186 new_fcts->towc = __wcsmbs_getfct ("INTERNAL", complete_name,
187 &new_fcts->towc_nsteps);
188 if (new_fcts->towc != NULL)
189 new_fcts->tomb = __wcsmbs_getfct (complete_name, "INTERNAL",
190 &new_fcts->tomb_nsteps);
191
192 /* If any of the conversion functions is not available we don't
193 use any since this would mean we cannot convert back and
194 forth. NB: NEW_FCTS was allocated with calloc. */
195 if (new_fcts->tomb == NULL)
196 {
197 if (new_fcts->towc != NULL)
198 __gconv_close_transform (new_fcts->towc, new_fcts->towc_nsteps);
199
200 free (new_fcts);
201
202 failed:
203 new_category->private.ctype = &__wcsmbs_gconv_fcts_c;
204 }
205 else
206 {
207 new_category->private.ctype = new_fcts;
208 new_category->private.cleanup = &_nl_cleanup_ctype;
209 }
210 }
211
212 __libc_rwlock_unlock (__libc_setlocale_lock);
213}
214
215
216/* Clone the current conversion function set. */
217void
218internal_function
219__wcsmbs_clone_conv (struct gconv_fcts *copy)
220{
221 const struct gconv_fcts *orig;
222
223 orig = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
224
225 /* Copy the data. */
226 *copy = *orig;
227
228 /* Now increment the usage counters.
229 Note: This assumes copy->*_nsteps == 1. */
230 if (copy->towc->__shlib_handle != NULL)
231 ++copy->towc->__counter;
232 if (copy->tomb->__shlib_handle != NULL)
233 ++copy->tomb->__counter;
234}
235
236
237/* Get converters for named charset. */
238int
239internal_function
240__wcsmbs_named_conv (struct gconv_fcts *copy, const char *name)
241{
242 copy->towc = __wcsmbs_getfct ("INTERNAL", name, &copy->towc_nsteps);
243 if (copy->towc == NULL)
244 return 1;
245
246 copy->tomb = __wcsmbs_getfct (name, "INTERNAL", &copy->tomb_nsteps);
247 if (copy->tomb == NULL)
248 {
249 __gconv_close_transform (copy->towc, copy->towc_nsteps);
250 return 1;
251 }
252
253 return 0;
254}
255
256void internal_function
257_nl_cleanup_ctype (struct __locale_data *locale)
258{
259 const struct gconv_fcts *const data = locale->private.ctype;
260 if (data != NULL)
261 {
262 locale->private.ctype = NULL;
263 locale->private.cleanup = NULL;
264
265 /* Free the old conversions. */
266 __gconv_close_transform (data->tomb, data->tomb_nsteps);
267 __gconv_close_transform (data->towc, data->towc_nsteps);
268 free ((char *) data);
269 }
270}
271