wcsmbs/mbsrtowcs.c

   1 /* Copyright (C) 1996,1997,1998,1999,2000,2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <dlfcn.h>
  21 #include <errno.h>
  22 #include <gconv.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <wchar.h>
  26 #include <wcsmbsload.h>
  27
  28 #include <assert.h>
  29
  30 #ifndef EILSEQ
  31 # define EILSEQ EINVAL
  32 #endif
  33
  34
  35 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
  36 size_t
  37 attribute_hidden
  38 __mbsrtowcs_l (dst, src, len, ps, l)
  39      wchar_t *dst;
  40      const char **src;
  41      size_t len;
  42      mbstate_t *ps;
  43      __locale_t l;
  44 #else
  45 /* This is the private state used if PS is NULL.  */
  46 static mbstate_t state;
  47
  48 size_t
  49 __mbsrtowcs (dst, src, len, ps)
  50      wchar_t *dst;
  51      const char **src;
  52      size_t len;
  53      mbstate_t *ps;
  54 #endif
  55 {
  56   struct __gconv_step_data data;
  57   size_t result;
  58   int status;
  59   struct __gconv_step *towc;
  60   size_t non_reversible;
  61
  62   /* Tell where we want the result.  */
  63   data.__invocation_counter = 0;
  64   data.__internal_use = 1;
  65   data.__flags = __GCONV_IS_LAST;
  66 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
  67   data.__statep = ps;
  68 #else
  69   data.__statep = ps ?: &state;
  70 #endif
  71   data.__trans = NULL;
  72
  73 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
  74   /* Get the conversion function matching the locale.  */
  75   towc = wcsmbs_get_towc_func (l);
  76 #else
  77   /* Make sure we use the correct function.  */
  78   update_conversion_ptrs ();
  79
  80   /* Get the structure with the function pointers.  */
  81   towc = __wcsmbs_gconv_fcts.towc;
  82 #endif
  83
  84   /* We have to handle DST == NULL special.  */
  85   if (dst == NULL)
  86     {
  87       mbstate_t temp_state;
  88       wchar_t buf[64];          /* Just an arbitrary size.  */
  89       const unsigned char *inbuf = (const unsigned char *) *src;
  90       const unsigned char *srcend = inbuf + strlen (inbuf) + 1;
  91
  92       temp_state = *data.__statep;
  93       data.__statep = &temp_state;
  94
  95       result = 0;
  96       data.__outbufend = (char *) buf + sizeof (buf);
  97       do
  98         {
  99           data.__outbuf = (char *) buf;
 100
 101           status = DL_CALL_FCT (towc->__fct,
 102                                 (towc, &data, &inbuf, srcend, NULL,
 103                                  &non_reversible, 0, 1));
 104
 105           result += (wchar_t *) data.__outbuf - buf;
 106         }
 107       while (status == __GCONV_FULL_OUTPUT);
 108
 109       if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
 110         {
 111           /* There better should be a NUL wide char at the end.  */
 112           assert (((wchar_t *) data.__outbuf)[-1] == L'\0');
 113           /* Don't count the NUL character in.  */
 114           --result;
 115         }
 116     }
 117   else
 118     {
 119       /* This code is based on the safe assumption that all internal
 120          multi-byte encodings use the NUL byte only to mark the end
 121          of the string.  */
 122       const unsigned char *srcend;
 123
 124       srcend = (const unsigned char *) (*src
 125                                         + __strnlen (*src, len * MB_CUR_MAX)
 126                                         + 1);
 127
 128       data.__outbuf = (unsigned char *) dst;
 129       data.__outbufend = data.__outbuf + len * sizeof (wchar_t);
 130
 131       status = DL_CALL_FCT (towc->__fct,
 132                             (towc, &data, (const unsigned char **) src, srcend,
 133                              NULL, &non_reversible, 0, 1));
 134
 135       result = (wchar_t *) data.__outbuf - dst;
 136
 137       /* We have to determine whether the last character converted
 138          is the NUL character.  */
 139       if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
 140           && ((wchar_t *) dst)[result - 1] == L'\0')
 141         {
 142           assert (result > 0);
 143           assert (__mbsinit (data.__statep));
 144           *src = NULL;
 145           --result;
 146         }
 147     }
 148
 149   /* There must not be any problems with the conversion but illegal input
 150      characters.  */
 151   assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
 152           || status == __GCONV_ILLEGAL_INPUT
 153           || status == __GCONV_INCOMPLETE_INPUT
 154           || status == __GCONV_FULL_OUTPUT);
 155
 156   if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
 157       && status != __GCONV_EMPTY_INPUT && status != __GCONV_INCOMPLETE_INPUT)
 158     {
 159       result = (size_t) -1;
 160       __set_errno (EILSEQ);
 161     }
 162
 163 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
 164   /* Free the conversion function data structures.  */
 165   wcsmbs_free_funcs (towc);
 166 #endif
 167
 168   return result;
 169 }
 170 #ifndef USE_IN_EXTENDED_LOCALE_MODEL
 171 weak_alias (__mbsrtowcs, mbsrtowcs)
 172 #endif