wcsmbs/wcrtomb.c

   1 /* Copyright (C) 1996,1997,1998,2000,2002,2005 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 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 <gconv.h>
  24 #include <stdlib.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 __wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
  40 {
  41   char buf[MB_CUR_MAX];
  42   struct __gconv_step_data data;
  43   int status;
  44   size_t result;
  45   size_t dummy;
  46   const struct gconv_fcts *fcts;
  47
  48   /* Set information for this step.  */
  49   data.__invocation_counter = 0;
  50   data.__internal_use = 1;
  51   data.__flags = __GCONV_IS_LAST;
  52   data.__statep = ps ?: &state;
  53   data.__trans = NULL;
  54
  55   /* A first special case is if S is NULL.  This means put PS in the
  56      initial state.  */
  57   if (s == NULL)
  58     {
  59       s = buf;
  60       wc = L'\0';
  61     }
  62
  63   /* Tell where we want to have the result.  */
  64   data.__outbuf = (unsigned char *) s;
  65   data.__outbufend = (unsigned char *) s + MB_CUR_MAX;
  66
  67   /* Get the conversion functions.  */
  68   fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
  69   __gconv_fct fct = fcts->tomb->__fct;
  70 #ifdef PTR_DEMANGLE
  71   if (fcts->tomb->__shlib_handle != NULL)
  72     PTR_DEMANGLE (fct);
  73 #endif
  74
  75   /* If WC is the NUL character we write into the output buffer the byte
  76      sequence necessary for PS to get into the initial state, followed
  77      by a NUL byte.  */
  78   if (wc == L'\0')
  79     {
  80       status = DL_CALL_FCT (fct, (fcts->tomb, &data, NULL, NULL,
  81                                   NULL, &dummy, 1, 1));
  82
  83       if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
  84         *data.__outbuf++ = '\0';
  85     }
  86   else
  87     {
  88       /* Do a normal conversion.  */
  89       const unsigned char *inbuf = (const unsigned char *) &wc;
  90
  91       status = DL_CALL_FCT (fct,
  92                             (fcts->tomb, &data, &inbuf,
  93                              inbuf + sizeof (wchar_t), NULL, &dummy, 0, 1));
  94     }
  95
  96   /* There must not be any problems with the conversion but illegal input
  97      characters.  The output buffer must be large enough, otherwise the
  98      definition of MB_CUR_MAX is not correct.  All the other possible
  99      errors also must not happen.  */
 100   assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
 101           || status == __GCONV_ILLEGAL_INPUT
 102           || status == __GCONV_INCOMPLETE_INPUT
 103           || status == __GCONV_FULL_OUTPUT);
 104
 105   if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
 106       || status == __GCONV_FULL_OUTPUT)
 107     result = data.__outbuf - (unsigned char *) s;
 108   else
 109     {
 110       result = (size_t) -1;
 111       __set_errno (EILSEQ);
 112     }
 113
 114   return result;
 115 }
 116 weak_alias (__wcrtomb, wcrtomb)
 117 libc_hidden_weak (wcrtomb)