summaryrefslogtreecommitdiff
path: root/libc/wcsmbs/mbsrtowcs_l.c
blob: d489266d38bddfd55bb8ca56d3119eb33b804288 (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
/* Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.org>, 2002.

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

#include <sysdep.h>

#ifndef EILSEQ
# define EILSEQ EINVAL
#endif


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;
{
  struct __gconv_step_data data;
  size_t result;
  int status;
  struct __gconv_step *towc;
  size_t non_reversible;
  const struct gconv_fcts *fcts;

  /* Tell where we want the result.  */
  data.__invocation_counter = 0;
  data.__internal_use = 1;
  data.__flags = __GCONV_IS_LAST;
  data.__statep = ps;
  data.__trans = NULL;

  /* Get the conversion functions.  */
  fcts = get_gconv_fcts (l->__locales[LC_CTYPE]);

  /* Get the structure with the function pointers.  */
  towc = fcts->towc;
  __gconv_fct fct = towc->__fct;
#ifdef PTR_DEMANGLE
  if (towc->__shlib_handle != NULL)
    PTR_DEMANGLE (fct);
#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 (*src) + 1;

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

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

	  status = DL_CALL_FCT (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 *srcp = (const unsigned char *) *src;
      const unsigned char *srcend;

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

      status = __GCONV_FULL_OUTPUT;

      while (len > 0)
	{
	  /* Pessimistic guess as to how much input we can use.  In the
	     worst case we need one input byte for one output wchar_t.  */
	  srcend = srcp + __strnlen ((const char *) srcp, len) + 1;

	  status = DL_CALL_FCT (fct, (towc, &data, &srcp, srcend, NULL,
				      &non_reversible, 0, 1));
	  if ((status != __GCONV_EMPTY_INPUT
	       && status != __GCONV_INCOMPLETE_INPUT)
	      /* Not all input read.  */
	      || srcp != srcend
	      /* Reached the end of the input.  */
	      || srcend[-1] == '\0')
	    break;

	  len = (wchar_t *) data.__outbufend - (wchar_t *) data.__outbuf;
	}

      /* Make the end if the input known to the caller.  */
      *src = (const char *) srcp;

      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);
    }

  return result;
}