lib/ucs4be.h

   1 /*
   2  * Copyright (C) 1999-2000, 2016, 2024 Free Software Foundation, Inc.
   3  * This file is part of the GNU LIBICONV Library.
   4  *
   5  * The GNU LIBICONV Library is free software; you can redistribute it
   6  * and/or modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either version 2.1
   8  * of the License, or (at your option) any later version.
   9  *
  10  * The GNU LIBICONV Library is distributed in the hope that it will be
  11  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
  17  * If not, see <https://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21  * UCS-4BE = UCS-4 big endian
  22  */
  23
  24 static int
  25 ucs4be_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  26 {
  27   if (n >= 4) {
  28     *pwc =   ((ucs4_t) s[0] << 24)
  29            + ((ucs4_t) s[1] << 16)
  30            + ((ucs4_t) s[2] << 8)
  31            +  (ucs4_t) s[3];
  32     return 4;
  33   }
  34   return RET_TOOFEW(0);
  35 }
  36
  37 static int
  38 ucs4be_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  39 {
  40   if (n >= 4) {
  41     r[0] = (unsigned char) (wc >> 24);
  42     r[1] = (unsigned char) (wc >> 16);
  43     r[2] = (unsigned char) (wc >> 8);
  44     r[3] = (unsigned char) wc;
  45     return 4;
  46   } else
  47     return RET_TOOSMALL;
  48 }