lib/utf32be.h

   1 /*
   2  * Copyright (C) 1999-2001, 2016 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  * UTF-32BE
  22  */
  23
  24 /* Specification: Unicode 3.1 Standard Annex #19 */
  25
  26 static int
  27 utf32be_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  28 {
  29   if (n >= 4) {
  30     ucs4_t wc = (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3];
  31     if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
  32       *pwc = wc;
  33       return 4;
  34     } else
  35       return RET_ILSEQ;
  36   }
  37   return RET_TOOFEW(0);
  38 }
  39
  40 static int
  41 utf32be_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  42 {
  43   if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
  44     if (n >= 4) {
  45       r[0] = 0;
  46       r[1] = (unsigned char) (wc >> 16);
  47       r[2] = (unsigned char) (wc >> 8);
  48       r[3] = (unsigned char) wc;
  49       return 4;
  50     } else
  51       return RET_TOOSMALL;
  52   }
  53   return RET_ILUNI;
  54 }