wcsmbs/wcsrtombs.c

   1 /* Copyright (C) 1996-2000, 2002, 2003, 2005 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 <assert.h>
  21 #include <dlfcn.h>
  22 #include <errno.h>
  23 #include <stdlib.h>
  24 #include <gconv.h>
  25 #include <wchar.h>
  26 #include <wcsmbsload.h>
  27
  28 #include <sysdep.h>
  29
  30 #ifndef EILSEQ
  31 # define EILSEQ EINVAL
  32 #endif
  33
  34
  35 /* This is the private state used if PS is NULL.  */
  36 static mbstate_t state;
  37
  38 size_t
  39 __wcsrtombs (dst, src, len, ps)
  40      char *dst;
  41      const wchar_t **src;
  42      size_t len;
  43      mbstate_t *ps;
  44 {
  45   struct __gconv_step_data data;
  46   int status;
  47   size_t result;
  48   struct __gconv_step *tomb;
  49   const struct gconv_fcts *fcts;
  50
  51   /* Tell where we want the result.  */
  52   data.__invocation_counter = 0;
  53   data.__internal_use = 1;
  54   data.__flags = __GCONV_IS_LAST;
  55   data.__statep = ps ?: &state;
  56   data.__trans = NULL;
  57
  58   /* Get the conversion functions.  */
  59   fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
  60
  61   /* Get the structure with the function pointers.  */
  62   tomb = fcts->tomb;
  63   __gconv_fct fct = tomb->__fct;
  64 #ifdef PTR_DEMANGLE
  65   if (tomb->__shlib_handle != NULL)
  66     PTR_DEMANGLE (fct);
  67 #endif
  68
  69   /* We have to handle DST == NULL special.  */
  70   if (dst == NULL)
  71     {
  72       mbstate_t temp_state;
  73       unsigned char buf[256];           /* Just an arbitrary value.  */
  74       const wchar_t *srcend = *src + __wcslen (*src) + 1;
  75       const unsigned char *inbuf = (const unsigned char *) *src;
  76       size_t dummy;
  77
  78       temp_state = *data.__statep;
  79       data.__statep = &temp_state;
  80
  81       result = 0;
  82       data.__outbufend = buf + sizeof (buf);
  83
  84       do
  85         {
  86           data.__outbuf = buf;
  87
  88           status = DL_CALL_FCT (fct, (tomb, &data, &inbuf,
  89                                       (const unsigned char *) srcend, NULL,
  90                                       &dummy, 0, 1));
  91
  92           /* Count the number of bytes.  */
  93           result += data.__outbuf - buf;
  94         }
  95       while (status == __GCONV_FULL_OUTPUT);
  96
  97       if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
  98         {
  99           /* There better should be a NUL byte at the end.  */
 100           assert (data.__outbuf[-1] == '\0');
 101           /* Don't count the NUL character in.  */
 102           --result;
 103         }
 104     }
 105   else
 106     {
 107       /* This code is based on the safe assumption that all internal
 108          multi-byte encodings use the NUL byte only to mark the end
 109          of the string.  */
 110       const wchar_t *srcend = *src + __wcsnlen (*src, len) + 1;
 111       size_t dummy;
 112
 113       data.__outbuf = (unsigned char *) dst;
 114       data.__outbufend = (unsigned char *) dst + len;
 115
 116       status = DL_CALL_FCT (fct, (tomb, &data, (const unsigned char **) src,
 117                                   (const unsigned char *) srcend, NULL,
 118                                   &dummy, 0, 1));
 119
 120       /* Count the number of bytes.  */
 121       result = data.__outbuf - (unsigned char *) dst;
 122
 123       /* We have to determine whether the last character converted
 124          is the NUL character.  */
 125       if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
 126           && data.__outbuf[-1] == '\0')
 127         {
 128           assert (data.__outbuf != (unsigned char *) dst);
 129           assert (__mbsinit (data.__statep));
 130           *src = NULL;
 131           --result;
 132         }
 133     }
 134
 135   /* There must not be any problems with the conversion but illegal input
 136      characters.  */
 137   assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
 138           || status == __GCONV_ILLEGAL_INPUT
 139           || status == __GCONV_INCOMPLETE_INPUT
 140           || status == __GCONV_FULL_OUTPUT);
 141
 142   if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
 143       && status != __GCONV_EMPTY_INPUT)
 144     {
 145       result = (size_t) -1;
 146       __set_errno (EILSEQ);
 147     }
 148
 149   return result;
 150 }
 151 weak_alias (__wcsrtombs, wcsrtombs)