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 } 61