File: wcsmbsload.c

package info (click to toggle)
glibc 2.19-18+deb8u7
  • links: PTS, VCS
  • area: main
  • in suites: jessie-backports
  • size: 204,748 kB
  • sloc: ansic: 970,427; asm: 241,207; sh: 10,069; makefile: 8,476; cpp: 3,595; perl: 2,077; pascal: 1,839; awk: 1,704; yacc: 317; sed: 73
file content (270 lines) | stat: -rw-r--r-- 7,809 bytes parent folder | download | duplicates (10)
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
/* Copyright (C) 1998-2014 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.

   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, see
   <http://www.gnu.org/licenses/>.  */

#include <ctype.h>
#include <langinfo.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>

#include <locale/localeinfo.h>
#include <wcsmbsload.h>
#include <bits/libc-lock.h>


/* These are the descriptions for the default conversion functions.  */
static const struct __gconv_step to_wc =
{
  .__shlib_handle = NULL,
  .__modname = NULL,
  .__counter = INT_MAX,
  .__from_name = (char *) "ANSI_X3.4-1968//TRANSLIT",
  .__to_name = (char *) "INTERNAL",
  .__fct = __gconv_transform_ascii_internal,
  .__btowc_fct = __gconv_btwoc_ascii,
  .__init_fct = NULL,
  .__end_fct = NULL,
  .__min_needed_from = 1,
  .__max_needed_from = 1,
  .__min_needed_to = 4,
  .__max_needed_to = 4,
  .__stateful = 0,
  .__data = NULL
};

static const struct __gconv_step to_mb =
{
  .__shlib_handle = NULL,
  .__modname = NULL,
  .__counter = INT_MAX,
  .__from_name = (char *) "INTERNAL",
  .__to_name = (char *) "ANSI_X3.4-1968//TRANSLIT",
  .__fct = __gconv_transform_internal_ascii,
  .__btowc_fct = NULL,
  .__init_fct = NULL,
  .__end_fct = NULL,
  .__min_needed_from = 4,
  .__max_needed_from = 4,
  .__min_needed_to = 1,
  .__max_needed_to = 1,
  .__stateful = 0,
  .__data = NULL
};


/* For the default locale we only have to handle ANSI_X3.4-1968.  */
const struct gconv_fcts __wcsmbs_gconv_fcts_c =
{
  .towc = (struct __gconv_step *) &to_wc,
  .towc_nsteps = 1,
  .tomb = (struct __gconv_step *) &to_mb,
  .tomb_nsteps = 1,
};


attribute_hidden
struct __gconv_step *
__wcsmbs_getfct (const char *to, const char *from, size_t *nstepsp)
{
  size_t nsteps;
  struct __gconv_step *result;
#if 0
  size_t nstateful;
  size_t cnt;
#endif

  if (__gconv_find_transform (to, from, &result, &nsteps, 0) != __GCONV_OK)
    /* Loading the conversion step is not possible.  */
    return NULL;

  /* Maybe it is someday necessary to allow more than one step.
     Currently this is not the case since the conversions handled here
     are from and to INTERNAL and there always is a converted for
     that.  It the directly following code is enabled the libio
     functions will have to allocate appropriate __gconv_step_data
     elements instead of only one.  */
#if 0
  /* Count the number of stateful conversions.  Since we will only
     have one 'mbstate_t' object available we can only deal with one
     stateful conversion.  */
  nstateful = 0;
  for (cnt = 0; cnt < nsteps; ++cnt)
    if (result[cnt].__stateful)
      ++nstateful;
  if (nstateful > 1)
#else
  if (nsteps > 1)
#endif
    {
      /* We cannot handle this case.  */
      __gconv_close_transform (result, nsteps);
      result = NULL;
    }
  else
    *nstepsp = nsteps;

  return result;
}


/* Extract from the given locale name the character set portion.  Since
   only the XPG form of the name includes this information we don't have
   to take care for the CEN form.  */
#define extract_charset_name(str) \
  ({									      \
    const char *cp = str;						      \
    char *result = NULL;						      \
									      \
    cp += strcspn (cp, "@.+,");						      \
    if (*cp == '.')							      \
      {									      \
	const char *endp = ++cp;					      \
	while (*endp != '\0' && *endp != '@')				      \
	  ++endp;							      \
	if (endp != cp)							      \
	  result = strndupa (cp, endp - cp);				      \
      }									      \
    result;								      \
  })


/* Some of the functions here must not be used while setlocale is called.  */
__libc_rwlock_define (extern, __libc_setlocale_lock attribute_hidden)

/* Load conversion functions for the currently selected locale.  */
void
internal_function
__wcsmbs_load_conv (struct __locale_data *new_category)
{
  /* Acquire the lock.  */
  __libc_rwlock_wrlock (__libc_setlocale_lock);

  /* We should repeat the test since while we waited some other thread
     might have run this function.  */
  if (__builtin_expect (new_category->private.ctype == NULL, 1))
    {
      /* We must find the real functions.  */
      const char *charset_name;
      const char *complete_name;
      struct gconv_fcts *new_fcts;
      int use_translit;

      /* Allocate the gconv_fcts structure.  */
      new_fcts = calloc (1, sizeof *new_fcts);
      if (new_fcts == NULL)
	goto failed;

      /* Get name of charset of the locale.  */
      charset_name = new_category->values[_NL_ITEM_INDEX(CODESET)].string;

      /* Does the user want transliteration?  */
      use_translit = new_category->use_translit;

      /* Normalize the name and add the slashes necessary for a
	 complete lookup.  */
      complete_name = norm_add_slashes (charset_name,
					use_translit ? "TRANSLIT" : "");

      /* It is not necessary to use transliteration in this direction
	 since the internal character set is supposed to be able to
	 represent all others.  */
      new_fcts->towc = __wcsmbs_getfct ("INTERNAL", complete_name,
					&new_fcts->towc_nsteps);
      if (new_fcts->towc != NULL)
	new_fcts->tomb = __wcsmbs_getfct (complete_name, "INTERNAL",
					  &new_fcts->tomb_nsteps);

      /* If any of the conversion functions is not available we don't
	 use any since this would mean we cannot convert back and
	 forth.  NB: NEW_FCTS was allocated with calloc.  */
      if (new_fcts->tomb == NULL)
	{
	  if (new_fcts->towc != NULL)
	    __gconv_close_transform (new_fcts->towc, new_fcts->towc_nsteps);

	  free (new_fcts);

	failed:
	  new_category->private.ctype = &__wcsmbs_gconv_fcts_c;
	}
      else
	{
	  new_category->private.ctype = new_fcts;
	  new_category->private.cleanup = &_nl_cleanup_ctype;
	}
    }

  __libc_rwlock_unlock (__libc_setlocale_lock);
}


/* Clone the current conversion function set.  */
void
internal_function
__wcsmbs_clone_conv (struct gconv_fcts *copy)
{
  const struct gconv_fcts *orig;

  orig = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));

  /* Copy the data.  */
  *copy = *orig;

  /* Now increment the usage counters.
     Note: This assumes copy->*_nsteps == 1.  */
  if (copy->towc->__shlib_handle != NULL)
    ++copy->towc->__counter;
  if (copy->tomb->__shlib_handle != NULL)
    ++copy->tomb->__counter;
}


/* Get converters for named charset.  */
int
internal_function
__wcsmbs_named_conv (struct gconv_fcts *copy, const char *name)
{
  copy->towc = __wcsmbs_getfct ("INTERNAL", name, &copy->towc_nsteps);
  if (copy->towc == NULL)
    return 1;

  copy->tomb = __wcsmbs_getfct (name, "INTERNAL", &copy->tomb_nsteps);
  if (copy->tomb == NULL)
    {
      __gconv_close_transform (copy->towc, copy->towc_nsteps);
      return 1;
    }

  return 0;
}

void internal_function
_nl_cleanup_ctype (struct __locale_data *locale)
{
  const struct gconv_fcts *const data = locale->private.ctype;
  if (data != NULL)
    {
      locale->private.ctype = NULL;
      locale->private.cleanup = NULL;

      /* Free the old conversions.  */
      __gconv_close_transform (data->tomb, data->tomb_nsteps);
      __gconv_close_transform (data->towc, data->towc_nsteps);
      free ((char *) data);
    }
}