about summary refs log tree commit diff
path: root/iconv/gconv_open.c
blob: 9deeb5363c69656292a5a17f0574334cd18cec41 (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
/* Find matching transformation algorithms and initialize steps.
   Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

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

#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include <gconv_int.h>


int
internal_function
__gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
	      int flags)
{
  struct __gconv_step *steps;
  size_t nsteps;
  __gconv_t result = NULL;
  size_t cnt = 0;
  int res;
  const char *errhand;
  const char *ignore;
  struct trans_struct *trans = NULL;

  /* Find out whether any error handling method is specified.  */
  errhand = strchr (toset, '/');
  if (errhand != NULL)
    errhand = strchr (errhand + 1, '/');
  if (__builtin_expect (errhand != NULL, 1))
    {
      if (*++errhand == '\0')
	errhand = NULL;
      else
	{
	  /* Make copy without the error handling description.  */
	  char *newtoset = (char *) alloca (errhand - toset + 1);
	  char *tok;
	  char *ptr;

	  newtoset[errhand - toset] = '\0';
	  toset = memcpy (newtoset, toset, errhand - toset);

	  /* Find the appropriate transliteration handlers.  */
	  tok = strdupa (errhand);

	  tok = __strtok_r (tok, ",", &ptr);
	  while (tok != NULL)
	    {
	      if (__strcasecmp (tok, "TRANSLIT") == 0)
		{
		  /* It's the builtin transliteration handling.  We only
		     support it for working on the internal encoding.  */
		  static const char *internal_trans_names[1] = { "INTERNAL" };
		  struct trans_struct *lastp = NULL;
		  struct trans_struct *runp;

		  for (runp = trans; runp != NULL; runp = runp->next)
		    if (runp->trans_fct == __gconv_transliterate)
		      break;
		    else
		      lastp = runp;

		  if (runp == NULL)
		    {
		      struct trans_struct *newp;

		      newp = (struct trans_struct *) alloca (sizeof (*newp));
		      memset (newp, '\0', sizeof (*newp));

		      /* We leave the `name' field zero to signal that
			 this is an internal transliteration step.  */
		      newp->csnames = internal_trans_names;
		      newp->ncsnames = 1;
		      newp->trans_fct = __gconv_transliterate;

		      if (lastp == NULL)
			trans = newp;
		      else
			lastp->next = newp;
		    }
		}
	      else if (__strcasecmp (tok, "IGNORE") == 0)
		/* Set the flag to ignore all errors.  */
		flags = __GCONV_IGNORE_ERRORS;
	      else
		{
		  /* `tok' is possibly a module name.  We'll see later
		     whether we can find it.  But first see that we do
		     not already a module of this name.  */
		  struct trans_struct *lastp = NULL;
		  struct trans_struct *runp;

		  for (runp = trans; runp != NULL; runp = runp->next)
		    if (runp->name != NULL
			&& __strcasecmp (tok, runp->name) == 0)
		      break;
		    else
		      lastp = runp;

		  if (runp == NULL)
		    {
		      struct trans_struct *newp;

		      newp = (struct trans_struct *) alloca (sizeof (*newp));
		      memset (newp, '\0', sizeof (*newp));
		      newp->name = tok;

		      if (lastp == NULL)
			trans = newp;
		      else
			lastp->next = newp;
		    }
		}

	      tok = __strtok_r (NULL, ",", &ptr);
	    }
	}
    }

  /* For the source character set we ignore the error handler specification.
     XXX Is this really always the best?  */
  ignore = strchr (fromset, '/');
  if (ignore != NULL && (ignore = strchr (ignore + 1, '/')) != NULL
      && *++ignore != '\0')
    {
      char *newfromset = (char *) alloca (ignore - fromset + 1);

      newfromset[ignore - fromset] = '\0';
      fromset = memcpy (newfromset, fromset, ignore - fromset);
    }

  res = __gconv_find_transform (toset, fromset, &steps, &nsteps, flags);
  if (res == __GCONV_OK)
    {
      /* Find the modules.  */
      struct trans_struct *lastp = NULL;
      struct trans_struct *runp;

      for (runp = trans; runp != NULL; runp = runp->next)
	{
	  if (runp->name == NULL
	      || __builtin_expect (__gconv_translit_find (runp), 0) == 0)
	    lastp = runp;
	  else
	    /* This means we haven't found the module.  Remove it.  */
	    (lastp == NULL ? trans : lastp->next) = runp->next;
	}

      /* Allocate room for handle.  */
      result = (__gconv_t) malloc (sizeof (struct __gconv_info)
				   + (nsteps
				      * sizeof (struct __gconv_step_data)));
      if (result == NULL)
	res = __GCONV_NOMEM;
      else
	{
	  size_t n;

	  /* Remember the list of steps.  */
	  result->__steps = steps;
	  result->__nsteps = nsteps;

	  /* Clear the array for the step data.  */
	  memset (result->__data, '\0',
		  nsteps * sizeof (struct __gconv_step_data));

	  /* Call all initialization functions for the transformation
	     step implementations.  */
	  for (cnt = 0; cnt < nsteps; ++cnt)
	    {
	      size_t size;

	      /* Would have to be done if we would not clear the whole
                 array above.  */
#if 0
	      /* Reset the counter.  */
	      result->__data[cnt].__invocation_counter = 0;

	      /* It's a regular use.  */
	      result->__data[cnt].__internal_use = 0;
#endif

	      /* We use the `mbstate_t' member in DATA.  */
	      result->__data[cnt].__statep = &result->__data[cnt].__state;

	      /* Now see whether we can use any of the transliteration
		 modules for this step.  */
	      for (runp = trans; runp != NULL; runp = runp->next)
		for (n = 0; n < runp->ncsnames; ++n)
		  if (__strcasecmp (steps[cnt].__from_name,
				    runp->csnames[n]) == 0)
		    {
		      void *data = NULL;

		      /* Match!  Now try the initializer.  */
		      if (runp->trans_init_fct == NULL
			  || (runp->trans_init_fct (&data,
						    steps[cnt].__to_name)
			      == __GCONV_OK))
			{
			  /* Append at the end of the list.  */
			  struct __gconv_trans_data *newp;
			  struct __gconv_trans_data **lastp;

			  newp = (struct __gconv_trans_data *)
			    malloc (sizeof (struct __gconv_trans_data));
			  if (newp == NULL)
			    {
			      res = __GCONV_NOMEM;
			      goto bail;
			    }

			  newp->__trans_fct = runp->trans_fct;
			  newp->__trans_context_fct = runp->trans_context_fct;
			  newp->__trans_end_fct = runp->trans_end_fct;
			  newp->__data = data;
			  newp->__next = NULL;

			  lastp = &result->__data[cnt].__trans;
			  while (*lastp != NULL)
			    lastp = &(*lastp)->__next;

			  *lastp = newp;
			}
		      break;
		    }

	      /* If this is the last step we must not allocate an
		 output buffer.  */
	      if (cnt < nsteps - 1)
		{
		  result->__data[cnt].__flags = flags;

		  /* Allocate the buffer.  */
		  size = (GCONV_NCHAR_GOAL * steps[cnt].__max_needed_to);

		  result->__data[cnt].__outbuf = (char *) malloc (size);
		  if (result->__data[cnt].__outbuf == NULL)
		    {
		      res = __GCONV_NOMEM;
		      goto bail;
		    }

		  result->__data[cnt].__outbufend =
		    result->__data[cnt].__outbuf + size;
		}
	      else
		{
		  /* Handle the last entry.  */
		  result->__data[cnt].__flags = flags | __GCONV_IS_LAST;

		  break;
		}
	    }
	}

      if (res != __GCONV_OK)
	{
	  /* Something went wrong.  Free all the resources.  */
	  int serrno;
	bail:
	  serrno = errno;

	  if (result != NULL)
	    {
	      while (cnt-- > 0)
		{
		  struct __gconv_trans_data *transp;

		  transp = result->__data[cnt].__trans;
		  while (transp != NULL)
		    {
		      struct __gconv_trans_data *curp = transp;
		      transp = transp->__next;

		      if (__builtin_expect (curp->__trans_end_fct != NULL, 0))
			curp->__trans_end_fct (curp->__data);

		      free (curp);
		    }

		  free (result->__data[cnt].__outbuf);
		}

	      free (result);
	      result = NULL;
	    }

	  __gconv_close_transform (steps, nsteps);

	  __set_errno (serrno);
	}
    }

  *handle = result;
  return res;
}