lib/ucs2internal.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  * UCS-2-INTERNAL = UCS-2 with machine dependent endianness and alignment
  22  */
  23
  24 static int
  25 ucs2internal_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  26 {
  27   if (n >= 2) {
  28     unsigned short x = *(const unsigned short *)s;
  29     if (x >= 0xd800 && x < 0xe000) {
  30       return RET_ILSEQ;
  31     } else {
  32       *pwc = x;
  33       return 2;
  34     }
  35   }
  36   return RET_TOOFEW(0);
  37 }
  38
  39 static int
  40 ucs2internal_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  41 {
  42   if (wc < 0x10000 && !(wc >= 0xd800 && wc < 0xe000)) {
  43     if (n >= 2) {
  44       *(unsigned short *)r = wc;
  45       return 2;
  46     } else
  47       return RET_TOOSMALL;
  48   } else
  49     return RET_ILUNI;
  50 }