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libiconv 1.16

    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 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, see <https://www.gnu.org/licenses/>.
   18:  */
   19: 
   20: /*
   21:  * UCS-2-SWAPPED = UCS-2-INTERNAL with inverted endianness
   22:  */
   23: 
   24: static int
   25: ucs2swapped_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
   26: {
   27:   /* This function assumes that 'unsigned short' has exactly 16 bits. */
   28:   if (sizeof(unsigned short) != 2) abort();
   29: 
   30:   if (n >= 2) {
   31:     unsigned short x = *(const unsigned short *)s;
   32:     x = (x >> 8) | (x << 8);
   33:     if (x >= 0xd800 && x < 0xe000) {
   34:       return RET_ILSEQ;
   35:     } else {
   36:       *pwc = x;
   37:       return 2;
   38:     }
   39:   }
   40:   return RET_TOOFEW(0);
   41: }
   42: 
   43: static int
   44: ucs2swapped_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
   45: {
   46:   /* This function assumes that 'unsigned short' has exactly 16 bits. */
   47:   if (sizeof(unsigned short) != 2) abort();
   48: 
   49:   if (wc < 0x10000 && !(wc >= 0xd800 && wc < 0xe000)) {
   50:     if (n >= 2) {
   51:       unsigned short x = wc;
   52:       x = (x >> 8) | (x << 8);
   53:       *(unsigned short *)r = x;
   54:       return 2;
   55:     } else
   56:       return RET_TOOSMALL;
   57:   } else
   58:     return RET_ILUNI;
   59: }