wcsmbs/wcsrtombs.c

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