wcsmbs/wcrtomb.c

   1 /* Copyright (C) 1996-1998,2000,2002,2005,2011,2012
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <assert.h>
  22 #include <dlfcn.h>
  23 #include <errno.h>
  24 #include <gconv.h>
  25 #include <stdlib.h>
  26 #include <wchar.h>
  27 #include <wcsmbsload.h>
  28
  29 #include <sysdep.h>
  30
  31 #ifndef EILSEQ
  32 # define EILSEQ EINVAL
  33 #endif
  34
  35
  36 /* This is the private state used if PS is NULL.  */
  37 static mbstate_t state;
  38
  39 size_t
  40 __wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
  41 {
  42   char buf[MB_LEN_MAX];
  43   struct __gconv_step_data data;
  44   int status;
  45   size_t result;
  46   size_t dummy;
  47   const struct gconv_fcts *fcts;
  48
  49   /* Set information for this step.  */
  50   data.__invocation_counter = 0;
  51   data.__internal_use = 1;
  52   data.__flags = __GCONV_IS_LAST;
  53   data.__statep = ps ?: &state;
  54   data.__trans = NULL;
  55
  56   /* A first special case is if S is NULL.  This means put PS in the
  57      initial state.  */
  58   if (s == NULL)
  59     {
  60       s = buf;
  61       wc = L'\0';
  62     }
  63
  64   /* Tell where we want to have the result.  */
  65   data.__outbuf = (unsigned char *) s;
  66   data.__outbufend = (unsigned char *) s + MB_CUR_MAX;
  67
  68   /* Get the conversion functions.  */
  69   fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
  70   __gconv_fct fct = fcts->tomb->__fct;
  71 #ifdef PTR_DEMANGLE
  72   if (fcts->tomb->__shlib_handle != NULL)
  73     PTR_DEMANGLE (fct);
  74 #endif
  75
  76   /* If WC is the NUL character we write into the output buffer the byte
  77      sequence necessary for PS to get into the initial state, followed
  78      by a NUL byte.  */
  79   if (wc == L'\0')
  80     {
  81       status = DL_CALL_FCT (fct, (fcts->tomb, &data, NULL, NULL,
  82                                   NULL, &dummy, 1, 1));
  83
  84       if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
  85         *data.__outbuf++ = '\0';
  86     }
  87   else
  88     {
  89       /* Do a normal conversion.  */
  90       const unsigned char *inbuf = (const unsigned char *) &wc;
  91
  92       status = DL_CALL_FCT (fct,
  93                             (fcts->tomb, &data, &inbuf,
  94                              inbuf + sizeof (wchar_t), NULL, &dummy, 0, 1));
  95     }
  96
  97   /* There must not be any problems with the conversion but illegal input
  98      characters.  The output buffer must be large enough, otherwise the
  99      definition of MB_CUR_MAX is not correct.  All the other possible
 100      errors also must not happen.  */
 101   assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
 102           || status == __GCONV_ILLEGAL_INPUT
 103           || status == __GCONV_INCOMPLETE_INPUT
 104           || status == __GCONV_FULL_OUTPUT);
 105
 106   if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
 107       || status == __GCONV_FULL_OUTPUT)
 108     result = data.__outbuf - (unsigned char *) s;
 109   else
 110     {
 111       result = (size_t) -1;
 112       __set_errno (EILSEQ);
 113     }
 114
 115   return result;
 116 }
 117 weak_alias (__wcrtomb, wcrtomb)
 118 libc_hidden_weak (wcrtomb)
 119
 120 /* There should be no difference between the UTF-32 handling required
 121    by c32rtomb and the wchar_t handling which has long since been
 122    implemented in wcrtomb.  */
 123 weak_alias (__wcrtomb, c32rtomb)