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libiconv

    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., 51 Franklin Street,
   18:  * Fifth Floor, Boston, MA 02110-1301, USA.
   19:  */
   20: 
   21: /*
   22:  * UCS-2-SWAPPED = UCS-2-INTERNAL with inverted endianness
   23:  */
   24: 
   25: static int
   26: ucs2swapped_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
   27: {
   28:   /* This function assumes that 'unsigned short' has exactly 16 bits. */
   29:   if (sizeof(unsigned short) != 2) abort();
   30: 
   31:   if (n >= 2) {
   32:     unsigned short x = *(const unsigned short *)s;
   33:     x = (x >> 8) | (x << 8);
   34:     if (x >= 0xd800 && x < 0xe000) {
   35:       return RET_ILSEQ;
   36:     } else {
   37:       *pwc = x;
   38:       return 2;
   39:     }
   40:   }
   41:   return RET_TOOFEW(0);
   42: }
   43: 
   44: static int
   45: ucs2swapped_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
   46: {
   47:   /* This function assumes that 'unsigned short' has exactly 16 bits. */
   48:   if (sizeof(unsigned short) != 2) abort();
   49: 
   50:   if (wc < 0x10000 && !(wc >= 0xd800 && wc < 0xe000)) {
   51:     if (n >= 2) {
   52:       unsigned short x = wc;
   53:       x = (x >> 8) | (x << 8);
   54:       *(unsigned short *)r = x;
   55:       return 2;
   56:     } else
   57:       return RET_TOOSMALL;
   58:   } else
   59:     return RET_ILUNI;
   60: }