lib/utf32be.h

   1 /*
   2  * Copyright (C) 1999-2001 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 Library General Public
   7  * License as published by the Free Software Foundation; either version 2
   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  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public
  16  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
  17  * If not, write to the Free Software Foundation, Inc., 59 Temple Place -
  18  * Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22  * UTF-32BE
  23  */
  24
  25 /* Specification: Unicode 3.1 Standard Annex #19 */
  26
  27 static int
  28 utf32be_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  29 {
  30   if (n >= 4) {
  31     ucs4_t wc = (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3];
  32     if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
  33       *pwc = wc;
  34       return 4;
  35     } else
  36       return RET_ILSEQ;
  37   }
  38   return RET_TOOFEW(0);
  39 }
  40
  41 static int
  42 utf32be_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  43 {
  44   if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
  45     if (n >= 4) {
  46       r[0] = 0;
  47       r[1] = (unsigned char) (wc >> 16);
  48       r[2] = (unsigned char) (wc >> 8);
  49       r[3] = (unsigned char) wc;
  50       return 4;
  51     } else
  52       return RET_TOOSMALL;
  53   }
  54   return RET_ILSEQ;
  55 }