aboutsummaryrefslogtreecommitdiff
path: root/libio/iofwide.c
blob: 04c8bba6385f55202648dc6bb0bf5ef4bc39b6cf (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
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   This file is part of the GNU IO Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This 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
   General Public License for more details.

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

   As a special exception, if you link this library with files
   compiled with a GNU compiler to produce an executable, this does
   not cause the resulting executable to be covered by the GNU General
   Public License.  This exception does not however invalidate any
   other reasons why the executable file might be covered by the GNU
   General Public License.  */

#include <libioP.h>
#ifdef _LIBC
# include <wchar.h>
#endif
#include <stdlib.h>
#include <string.h>

#ifdef _LIBC
# include <langinfo.h>
# include <locale/localeinfo.h>
# include <wcsmbs/wcsmbsload.h>
#endif


/* Prototypes of libio's codecvt functions.  */
static enum __codecvt_result do_out (struct _IO_codecvt *codecvt,
				     __mbstate_t *statep,
				     const wchar_t *from_start,
				     const wchar_t *from_end,
				     const wchar_t **from_stop, char *to_start,
				     char *to_end, char **to_stop);
static enum __codecvt_result do_unshift (struct _IO_codecvt *codecvt,
					 __mbstate_t *statep, char *to_start,
					 char *to_end, char **to_stop);
static enum __codecvt_result do_in (struct _IO_codecvt *codecvt,
				    __mbstate_t *statep,
				    const char *from_start,
				    const char *from_end,
				    const char **from_stop, wchar_t *to_start,
				    wchar_t *to_end, wchar_t **to_stop);
static int do_encoding (struct _IO_codecvt *codecvt);
static int do_length (struct _IO_codecvt *codecvt, __mbstate_t *statep,
		      const char *from_start,
		      const char *from_end, _IO_size_t max);
static int do_max_length (struct _IO_codecvt *codecvt);
static int do_always_noconv (struct _IO_codecvt *codecvt);


/* The functions used in `codecvt' for libio are always the same.  */
struct _IO_codecvt __libio_codecvt =
{
  .__codecvt_destr = NULL,		/* Destructor, never used.  */
  .__codecvt_do_out = do_out,
  .__codecvt_do_unshift = do_unshift,
  .__codecvt_do_in = do_in,
  .__codecvt_do_encoding = do_encoding,
  .__codecvt_do_always_noconv = do_always_noconv,
  .__codecvt_do_length = do_length,
  .__codecvt_do_max_length = do_max_length
};


/* Return orientation of stream.  If mode is nonzero try to change
   the orientation first.  */
#undef _IO_fwide
int
_IO_fwide (fp, mode)
     _IO_FILE *fp;
     int mode;
{
  /* Normalize the value.  */
  mode = mode < 0 ? -1 : (mode == 0 ? 0 : 1);

  if (mode == 0 || fp->_mode != 0)
    /* The caller simply wants to know about the current orientation
       or the orientation already has been determined.  */
    return fp->_mode;

  _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
  _IO_flockfile (fp);

  /* Set the orientation appropriately.  */
  if (mode > 0)
    {
      fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end;
      fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_base;

      /* Clear the state.  We start all over again.  */
      memset (&fp->_wide_data->_IO_state, '\0', sizeof (__mbstate_t));
      memset (&fp->_wide_data->_IO_last_state, '\0', sizeof (__mbstate_t));

      /* Get the character conversion functions based on the currently
	 selected locale for LC_CTYPE.  */
#ifdef _LIBC
      {
	struct gconv_fcts fcts;
	struct _IO_codecvt *cc = &fp->_wide_data->_codecvt;

	__wcsmbs_clone_conv (&fcts);

	/* The functions are always the same.  */
	*cc = __libio_codecvt;

	cc->__cd_in.__cd.__nsteps = 1; /* Only one step allowed.  */
	cc->__cd_in.__cd.__steps = fcts.towc;

	cc->__cd_in.__cd.__data[0].__invocation_counter = 0;
	cc->__cd_in.__cd.__data[0].__internal_use = 1;
	cc->__cd_in.__cd.__data[0].__is_last = 1;
	cc->__cd_in.__cd.__data[0].__statep = &fp->_wide_data->_IO_state;

	cc->__cd_out.__cd.__nsteps = 1; /* Only one step allowed.  */
	cc->__cd_out.__cd.__steps = fcts.tomb;

	cc->__cd_out.__cd.__data[0].__invocation_counter = 0;
	cc->__cd_out.__cd.__data[0].__internal_use = 1;
	cc->__cd_out.__cd.__data[0].__is_last = 1;
	cc->__cd_out.__cd.__data[0].__statep = &fp->_wide_data->_IO_state;
      }
#else
# error "somehow determine this from LC_CTYPE"
#endif

      /* From now on use the wide character callback functions.  */
      ((struct _IO_FILE_plus *) fp)->vtable = fp->_wide_data->_wide_vtable;
    }

  /* Set the mode now.  */
  fp->_mode = mode;

  _IO_funlockfile (fp);
  _IO_cleanup_region_end (0);

  return mode;
}

#ifdef weak_alias
weak_alias (_IO_fwide, fwide)
#endif


static enum __codecvt_result
do_out (struct _IO_codecvt *codecvt, __mbstate_t *statep,
	const wchar_t *from_start, const wchar_t *from_end,
	const wchar_t **from_stop, char *to_start, char *to_end,
	char **to_stop)
{
  enum __codecvt_result result;

#ifdef _LIBC
  struct __gconv_step *gs = codecvt->__cd_out.__cd.__steps;
  int status;
  size_t written;
  const unsigned char *from_start_copy = (unsigned char *) from_start;

  codecvt->__cd_out.__cd.__data[0].__outbuf = to_start;
  codecvt->__cd_out.__cd.__data[0].__outbufend = to_end;
  codecvt->__cd_out.__cd.__data[0].__statep = statep;

  status = (*gs->__fct) (gs, codecvt->__cd_out.__cd.__data, &from_start_copy,
			 (const unsigned char *) from_end, &written, 0);

  *from_stop = (wchar_t *) from_start_copy;
  *to_stop = codecvt->__cd_out.__cd.__data[0].__outbuf;

  switch (status)
    {
    case __GCONV_OK:
    case __GCONV_EMPTY_INPUT:
      result = __codecvt_ok;
      break;

    case __GCONV_FULL_OUTPUT:
    case __GCONV_INCOMPLETE_INPUT:
      result = __codecvt_partial;
      break;

    default:
      result = __codecvt_error;
      break;
    }
#else
  /* Decide what to do.  */
  result = __codecvt_error;
#endif

  return result;
}


static enum __codecvt_result
do_unshift (struct _IO_codecvt *codecvt, __mbstate_t *statep,
	    char *to_start, char *to_end, char **to_stop)
{
  enum __codecvt_result result;

#ifdef _LIBC
  struct __gconv_step *gs = codecvt->__cd_out.__cd.__steps;
  int status;
  size_t written;

  codecvt->__cd_out.__cd.__data[0].__outbuf = to_start;
  codecvt->__cd_out.__cd.__data[0].__outbufend = to_end;
  codecvt->__cd_out.__cd.__data[0].__statep = statep;

  status = (*gs->__fct) (gs, codecvt->__cd_out.__cd.__data, NULL, NULL,
			 &written, 1);

  *to_stop = codecvt->__cd_out.__cd.__data[0].__outbuf;

  switch (status)
    {
    case __GCONV_OK:
    case __GCONV_EMPTY_INPUT:
      result = __codecvt_ok;
      break;

    case __GCONV_FULL_OUTPUT:
    case __GCONV_INCOMPLETE_INPUT:
      result = __codecvt_partial;
      break;

    default:
      result = __codecvt_error;
      break;
    }
#else
  /* Decide what to do.  */
  result = __codecvt_error;
#endif

  return result;
}


static enum __codecvt_result
do_in (struct _IO_codecvt *codecvt, __mbstate_t *statep,
       const char *from_start, const char *from_end, const char **from_stop,
       wchar_t *to_start, wchar_t *to_end, wchar_t **to_stop)
{
  enum __codecvt_result result;

#ifdef _LIBC
  struct __gconv_step *gs = codecvt->__cd_in.__cd.__steps;
  int status;
  size_t written;
  const unsigned char *from_start_copy = (unsigned char *) from_start;

  codecvt->__cd_in.__cd.__data[0].__outbuf = (char *) to_start;
  codecvt->__cd_in.__cd.__data[0].__outbufend = (char *) to_end;
  codecvt->__cd_in.__cd.__data[0].__statep = statep;

  status = (*gs->__fct) (gs, codecvt->__cd_in.__cd.__data, &from_start_copy,
			 from_end, &written, 0);

  *from_stop = from_start_copy;
  *to_stop = (wchar_t *) codecvt->__cd_in.__cd.__data[0].__outbuf;

  switch (status)
    {
    case __GCONV_OK:
    case __GCONV_EMPTY_INPUT:
      result = __codecvt_ok;
      break;

    case __GCONV_FULL_OUTPUT:
    case __GCONV_INCOMPLETE_INPUT:
      result = __codecvt_partial;
      break;

    default:
      result = __codecvt_error;
      break;
    }
#else
  /* Decide what to do.  */
  result = __codecvt_error;
#endif

  return result;
}


static int
do_encoding (struct _IO_codecvt *codecvt)
{
#ifdef _LIBC
  /* See whether the encoding is stateful.  */
  if (codecvt->__cd_in.__cd.__steps[0].__stateful)
    return -1;
  /* Fortunately not.  Now determine the input bytes for the conversion
     necessary for each wide character.  */
  if (codecvt->__cd_in.__cd.__steps[0].__min_needed_from
      != codecvt->__cd_in.__cd.__steps[0].__max_needed_from)
    /* Not a constant value.  */
    return 0;

  return codecvt->__cd_in.__cd.__steps[0].__min_needed_from;
#else
  /* Worst case scenario.  */
  return -1;
#endif
}


static int
do_always_noconv (struct _IO_codecvt *codecvt)
{
  return 0;
}


static int
do_length (struct _IO_codecvt *codecvt, __mbstate_t *statep,
	   const char *from_start, const char *from_end, _IO_size_t max)
{
  int result;
#ifdef _LIBC
  const unsigned char *cp = (const unsigned char *) from_start;
  wchar_t to_buf[max];
  struct __gconv_step *gs = codecvt->__cd_in.__cd.__steps;
  int status;
  size_t written;

  codecvt->__cd_in.__cd.__data[0].__outbuf = (char *) to_buf;
  codecvt->__cd_in.__cd.__data[0].__outbufend = (char *) &to_buf[max];
  codecvt->__cd_in.__cd.__data[0].__statep = statep;

  status = (*gs->__fct) (gs, codecvt->__cd_in.__cd.__data, &cp, from_end,
			 &written, 0);

  result = cp - (const unsigned char *) from_start;
#else
  /* Decide what to do.  */
  result = 0;
#endif

  return result;
}


static int
do_max_length (struct _IO_codecvt *codecvt)
{
#ifdef _LIBC
  return codecvt->__cd_in.__cd.__steps[0].__max_needed_from;
#else
  return MB_CUR_MAX;
#endif
}