lib/c32snrtombs.c

   1 /* Convert 32-bit wide string to string.
   2    Copyright (C) 2020-2024 Free Software Foundation, Inc.
   3
   4    This file is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation, either version 3 of the
   7    License, or (at your option) any later version.
   8
   9    This file is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2020.  */
  18
  19 #include <config.h>
  20
  21 #define IN_C32SNRTOMBS
  22 /* Specification.  */
  23 #include <uchar.h>
  24
  25 #include <wchar.h>
  26
  27 #if (HAVE_WORKING_MBRTOC32 && !_GL_WCHAR_T_IS_UCS4) || (GL_CHAR32_T_IS_UNICODE && GL_CHAR32_T_VS_WCHAR_T_NEEDS_CONVERSION) || _GL_SMALL_WCHAR_T
  28 /* The char32_t encoding of a multibyte character may be different than its
  29    wchar_t encoding, or char32_t is wider than wchar_t.  */
  30
  31 # include <errno.h>
  32 # include <stdlib.h>
  33 # include <string.h>
  34
  35 extern mbstate_t _gl_c32srtombs_state;
  36
  37 # define FUNC c32snrtombs
  38 # define SCHAR_T char32_t
  39 # define INTERNAL_STATE _gl_c32srtombs_state
  40 # define WCRTOMB c32rtomb
  41 # include "wcsnrtombs-impl.h"
  42
  43 #else
  44 /* char32_t and wchar_t are equivalent.  */
  45
  46 static_assert (sizeof (char32_t) == sizeof (wchar_t));
  47
  48 # if _GL_WCHAR_T_IS_UCS4
  49 _GL_EXTERN_INLINE
  50 # endif
  51 size_t
  52 c32snrtombs (char *dest, const char32_t **srcp, size_t srclen, size_t len,
  53              mbstate_t *ps)
  54 {
  55   return wcsnrtombs (dest, (const wchar_t **) srcp, srclen, len, ps);
  56 }
  57
  58 #endif