wcsmbs/wctob.c

   1 /* Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <gconv.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <wchar.h>
  24 #include <wcsmbsload.h>
  25
  26
  27 int
  28 wctob (c)
  29      wint_t c;
  30 {
  31   char buf[MB_LEN_MAX];
  32   struct __gconv_step_data data;
  33   wchar_t inbuf[1];
  34   wchar_t *inptr = inbuf;
  35   size_t dummy;
  36   int status;
  37
  38   /* Tell where we want the result.  */
  39   data.__outbuf = buf;
  40   data.__outbufend = buf + MB_LEN_MAX;
  41   data.__invocation_counter = 0;
  42   data.__internal_use = 1;
  43   data.__is_last = 1;
  44   data.__statep = &data.__state;
  45
  46   /* Make sure we start in the initial state.  */
  47   memset (&data.__state, '\0', sizeof (mbstate_t));
  48
  49   /* Make sure we use the correct function.  */
  50   update_conversion_ptrs ();
  51
  52   /* Create the input string.  */
  53   inbuf[0] = c;
  54
  55   status = (*__wcsmbs_gconv_fcts.tomb->__fct) (__wcsmbs_gconv_fcts.tomb, &data,
  56                                                (const unsigned char **) &inptr,
  57                                                (const unsigned char *) &inbuf[1],
  58                                                &dummy, 0);
  59   /* The conversion failed or the output is too long.  */
  60   if ((status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
  61        && status != __GCONV_EMPTY_INPUT)
  62       || data.__outbuf != (unsigned char *) (buf + 1))
  63     return EOF;
  64
  65   return (unsigned char) buf[0];
  66 }