lib/btowc.c

   1 /* Convert unibyte character to wide character.
   2    Copyright (C) 2008, 2010-2024 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       mbszero (&state);
  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 }