about summary refs log tree commit diff
path: root/libio/iofwide.c
blob: a6ca50f95b19b91720380039a428b9352e6ca46b (plain) (blame)
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
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
/* Copyright (C) 1999-2003, 2005, 2011 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.

   As a special exception, if you link the code in this file with
   files compiled with a GNU compiler to produce an executable,
   that does not cause the resulting executable to be covered by
   the GNU Lesser General Public License.  This exception does not
   however invalidate any other reasons why the executable file
   might be covered by the GNU Lesser General Public License.
   This exception applies to code released by its copyright holders
   in files containing the exception.  */

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

#ifdef _LIBC
# include <langinfo.h>
# include <locale/localeinfo.h>
# include <wcsmbs/wcsmbsload.h>
# include <iconv/gconv_int.h>
# include <shlib-compat.h>
# include <sysdep.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.  */
const 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
};


#ifdef _LIBC
const struct __gconv_trans_data __libio_translit attribute_hidden =
{
  .__trans_fct = __gconv_transliterate
};
#endif


/* 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 defined SHARED && defined _LIBC \
    && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
  if (__builtin_expect (&_IO_stdin_used == NULL, 0)
      && (fp == _IO_stdin || fp == _IO_stdout || fp == _IO_stderr))
    /* This is for a stream in the glibc 2.0 format.  */
    return -1;
#endif

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

  /* Set the orientation appropriately.  */
  if (mode > 0)
    {
      struct _IO_codecvt *cc = fp->_codecvt = &fp->_wide_data->_codecvt;

      fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end;
      fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_base;

      /* Get the character conversion functions based on the currently
	 selected locale for LC_CTYPE.  */
#ifdef _LIBC
      {
	/* 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));

	struct gconv_fcts fcts;
	__wcsmbs_clone_conv (&fcts);
	assert (fcts.towc_nsteps == 1);
	assert (fcts.tomb_nsteps == 1);

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

	cc->__cd_in.__cd.__nsteps = fcts.towc_nsteps;
	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].__flags = __GCONV_IS_LAST;
	cc->__cd_in.__cd.__data[0].__statep = &fp->_wide_data->_IO_state;

	/* XXX For now no transliteration.  */
	cc->__cd_in.__cd.__data[0].__trans = NULL;

	cc->__cd_out.__cd.__nsteps = fcts.tomb_nsteps;
	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].__flags = __GCONV_IS_LAST;
	cc->__cd_out.__cd.__data[0].__statep = &fp->_wide_data->_IO_state;

	/* And now the transliteration.  */
	cc->__cd_out.__cd.__data[0].__trans
	  = (struct __gconv_trans_data  *) &__libio_translit;
      }
#else
# ifdef _GLIBCPP_USE_WCHAR_T
      {
	/* Determine internal and external character sets.

	   XXX For now we make our life easy: we assume a fixed internal
	   encoding (as most sane systems have; hi HP/UX!).  If somebody
	   cares about systems which changing internal charsets they
	   should come up with a solution for the determination of the
	   currently used internal character set.  */
	const char *internal_ccs = _G_INTERNAL_CCS;
	const char *external_ccs = NULL;

#  ifdef HAVE_NL_LANGINFO
	external_ccs = nl_langinfo (CODESET);
#  endif
	if (external_ccs == NULL)
	  external_ccs = "ISO-8859-1";

	cc->__cd_in = iconv_open (internal_ccs, external_ccs);
	if (cc->__cd_in != (iconv_t) -1)
	  cc->__cd_out = iconv_open (external_ccs, internal_ccs);

	if (cc->__cd_in == (iconv_t) -1 || cc->__cd_out == (iconv_t) -1)
	  {
	    if (cc->__cd_in != (iconv_t) -1)
	      iconv_close (cc->__cd_in);
	    /* XXX */
	    abort ();
	  }
      }
# else
#  error "somehow determine this from LC_CTYPE"
# endif
#endif

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

      /* One last twist: we get the current stream position.  The wide
	 char streams have much more problems with not knowing the
	 current position and so we should disable the optimization
	 which allows the functions without knowing the position.  */
      fp->_offset = _IO_SYSSEEK (fp, 0, _IO_seek_cur);
    }

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

  return mode;
}


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 dummy;
  const unsigned char *from_start_copy = (unsigned char *) from_start;

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

  __gconv_fct fct = gs->__fct;
#ifdef PTR_DEMANGLE
  if (gs->__shlib_handle != NULL)
    PTR_DEMANGLE (fct);
#endif

  status = DL_CALL_FCT (fct,
			(gs, codecvt->__cd_out.__cd.__data, &from_start_copy,
			 (const unsigned char *) from_end, NULL,
			 &dummy, 0, 0));

  *from_stop = (wchar_t *) from_start_copy;
  *to_stop = (char *) 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
# ifdef _GLIBCPP_USE_WCHAR_T
  size_t res;
  const char *from_start_copy = (const char *) from_start;
  size_t from_len = from_end - from_start;
  char *to_start_copy = to_start;
  size_t to_len = to_end - to_start;
  res = iconv (codecvt->__cd_out, &from_start_copy, &from_len,
	       &to_start_copy, &to_len);

  if (res == 0 || from_len == 0)
    result = __codecvt_ok;
  else if (to_len < codecvt->__codecvt_do_max_length (codecvt))
    result = __codecvt_partial;
  else
    result = __codecvt_error;

# else
  /* Decide what to do.  */
  result = __codecvt_error;
# endif
#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 dummy;

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

  __gconv_fct fct = gs->__fct;
#ifdef PTR_DEMANGLE
  if (gs->__shlib_handle != NULL)
    PTR_DEMANGLE (fct);
#endif

  status = DL_CALL_FCT (fct,
			(gs, codecvt->__cd_out.__cd.__data, NULL, NULL,
			 NULL, &dummy, 1, 0));

  *to_stop = (char *) 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
# ifdef _GLIBCPP_USE_WCHAR_T
  size_t res;
  char *to_start_copy = (char *) to_start;
  size_t to_len = to_end - to_start;

  res = iconv (codecvt->__cd_out, NULL, NULL, &to_start_copy, &to_len);

  if (res == 0)
    result = __codecvt_ok;
  else if (to_len < codecvt->__codecvt_do_max_length (codecvt))
    result = __codecvt_partial;
  else
    result = __codecvt_error;
# else
  /* Decide what to do.  */
  result = __codecvt_error;
# endif
#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 dummy;
  const unsigned char *from_start_copy = (unsigned char *) from_start;

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

  __gconv_fct fct = gs->__fct;
#ifdef PTR_DEMANGLE
  if (gs->__shlib_handle != NULL)
    PTR_DEMANGLE (fct);
#endif

  status = DL_CALL_FCT (fct,
			(gs, codecvt->__cd_in.__cd.__data, &from_start_copy,
			 (const unsigned char *) from_end, NULL,
			 &dummy, 0, 0));

  *from_stop = (const char *) 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
# ifdef _GLIBCPP_USE_WCHAR_T
  size_t res;
  const char *from_start_copy = (const char *) from_start;
  size_t from_len = from_end - from_start;
  char *to_start_copy = (char *) from_start;
  size_t to_len = to_end - to_start;

  res = iconv (codecvt->__cd_in, &from_start_copy, &from_len,
	       &to_start_copy, &to_len);

  if (res == 0)
    result = __codecvt_ok;
  else if (to_len == 0)
    result = __codecvt_partial;
  else if (from_len < codecvt->__codecvt_do_max_length (codecvt))
    result = __codecvt_partial;
  else
    result = __codecvt_error;
# else
  /* Decide what to do.  */
  result = __codecvt_error;
# endif
#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;
  size_t dummy;

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

  __gconv_fct fct = gs->__fct;
#ifdef PTR_DEMANGLE
  if (gs->__shlib_handle != NULL)
    PTR_DEMANGLE (fct);
#endif

  DL_CALL_FCT (fct,
	       (gs, codecvt->__cd_in.__cd.__data, &cp,
		(const unsigned char *) from_end, NULL,
		&dummy, 0, 0));

  result = cp - (const unsigned char *) from_start;
#else
# ifdef _GLIBCPP_USE_WCHAR_T
  const char *from_start_copy = (const char *) from_start;
  size_t from_len = from_end - from_start;
  wchar_t to_buf[max];
  size_t res;
  char *to_start = (char *) to_buf;

  res = iconv (codecvt->__cd_in, &from_start_copy, &from_len,
	       &to_start, &max);

  result = from_start_copy - (char *) from_start;
# else
  /* Decide what to do.  */
  result = 0;
# endif
#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
}