1  /* Convert unibyte character to wide character.
       2     Copyright (C) 2008, 2010-2023 Free Software Foundation, Inc.
       3     Written by Bruno Haible <bruno@clisp.org>, 2008.
       4  
       5     This file is free software: you can redistribute it and/or modify
       6     it under the terms of the GNU Lesser General Public License as
       7     published by the Free Software Foundation; either version 2.1 of the
       8     License, or (at your option) any later version.
       9  
      10     This file 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
      13     GNU Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public License
      16     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <config.h>
      19  
      20  /* Specification.  */
      21  #include <wchar.h>
      22  
      23  #include <stdio.h>
      24  #include <stdlib.h>
      25  #include <string.h>
      26  
      27  wint_t
      28  btowc (int c)
      29  {
      30    if (c != EOF)
      31      {
      32        char buf[1];
      33        wchar_t wc;
      34  
      35        buf[0] = c;
      36  #if HAVE_MBRTOWC
      37        mbstate_t state;
      38        memset (&state, 0, sizeof (mbstate_t));
      39        size_t ret = mbrtowc (&wc, buf, 1, &state);
      40        if (!(ret == (size_t)(-1) || ret == (size_t)(-2)))
      41  #else
      42        if (mbtowc (&wc, buf, 1) >= 0)
      43  #endif
      44          return wc;
      45      }
      46    return WEOF;
      47  }