summary refs log tree commit diff
path: root/wcsmbs/mbsrtowcs.c
blob: 097e4621102b059274707a6bae996f616f24a096 (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
/* Copyright (C) 1996,1997,1998,1999,2000,2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.

   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.  */

#include <dlfcn.h>
#include <errno.h>
#include <gconv.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <wcsmbsload.h>

#include <assert.h>

#ifndef EILSEQ
# define EILSEQ EINVAL
#endif


#ifdef USE_IN_EXTENDED_LOCALE_MODEL
size_t
attribute_hidden
__mbsrtowcs_l (dst, src, len, ps, l)
     wchar_t *dst;
     const char **src;
     size_t len;
     mbstate_t *ps;
     __locale_t l;
#else
/* This is the private state used if PS is NULL.  */
static mbstate_t state;

size_t
__mbsrtowcs (dst, src, len, ps)
     wchar_t *dst;
     const char **src;
     size_t len;
     mbstate_t *ps;
#endif
{
  struct __gconv_step_data data;
  size_t result;
  int status;
  struct __gconv_step *towc;
  size_t non_reversible;

  /* Tell where we want the result.  */
  data.__invocation_counter = 0;
  data.__internal_use = 1;
  data.__flags = __GCONV_IS_LAST;
#ifdef USE_IN_EXTENDED_LOCALE_MODEL
  data.__statep = ps;
#else
  data.__statep = ps ?: &state;
#endif
  data.__trans = NULL;

#ifdef USE_IN_EXTENDED_LOCALE_MODEL
  /* Get the conversion function matching the locale.  */
  towc = wcsmbs_get_towc_func (l);
#else
  /* Make sure we use the correct function.  */
  update_conversion_ptrs ();

  /* Get the structure with the function pointers.  */
  towc = __wcsmbs_gconv_fcts.towc;
#endif

  /* We have to handle DST == NULL special.  */
  if (dst == NULL)
    {
      mbstate_t temp_state;
      wchar_t buf[64];		/* Just an arbitrary size.  */
      const unsigned char *inbuf = (const unsigned char *) *src;
      const unsigned char *srcend = inbuf + strlen (inbuf) + 1;

      temp_state = *data.__statep;
      data.__statep = &temp_state;

      result = 0;
      data.__outbufend = (char *) buf + sizeof (buf);
      do
	{
	  data.__outbuf = (char *) buf;

	  status = DL_CALL_FCT (towc->__fct,
				(towc, &data, &inbuf, srcend, NULL,
				 &non_reversible, 0, 1));

	  result += (wchar_t *) data.__outbuf - buf;
	}
      while (status == __GCONV_FULL_OUTPUT);

      if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
	{
	  /* There better should be a NUL wide char at the end.  */
	  assert (((wchar_t *) data.__outbuf)[-1] == L'\0');
	  /* Don't count the NUL character in.  */
	  --result;
	}
    }
  else
    {
      /* This code is based on the safe assumption that all internal
	 multi-byte encodings use the NUL byte only to mark the end
	 of the string.  */
      const unsigned char *srcend;

      srcend = (const unsigned char *) (*src
					+ __strnlen (*src, len * MB_CUR_MAX)
					+ 1);

      data.__outbuf = (unsigned char *) dst;
      data.__outbufend = data.__outbuf + len * sizeof (wchar_t);

      status = DL_CALL_FCT (towc->__fct,
			    (towc, &data, (const unsigned char **) src, srcend,
			     NULL, &non_reversible, 0, 1));

      result = (wchar_t *) data.__outbuf - dst;

      /* We have to determine whether the last character converted
	 is the NUL character.  */
      if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
	  && ((wchar_t *) dst)[result - 1] == L'\0')
	{
	  assert (result > 0);
	  assert (__mbsinit (data.__statep));
	  *src = NULL;
	  --result;
	}
    }

  /* There must not be any problems with the conversion but illegal input
     characters.  */
  assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
	  || status == __GCONV_ILLEGAL_INPUT
	  || status == __GCONV_INCOMPLETE_INPUT
	  || status == __GCONV_FULL_OUTPUT);

  if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
      && status != __GCONV_EMPTY_INPUT && status != __GCONV_INCOMPLETE_INPUT)
    {
      result = (size_t) -1;
      __set_errno (EILSEQ);
    }

#ifdef USE_IN_EXTENDED_LOCALE_MODEL
  /* Free the conversion function data structures.  */
  wcsmbs_free_funcs (towc);
#endif

  return result;
}
#ifndef USE_IN_EXTENDED_LOCALE_MODEL
weak_alias (__mbsrtowcs, mbsrtowcs)
#endif