1/* Conversion UCS-4 to UTF-16. 2 Copyright (C) 2002, 2006-2007, 2009-2010 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2002. 4 5 This program is free software: you can redistribute it and/or modify it 6 under the terms of the GNU Lesser General Public License as published 7 by the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 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 License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18#include <config.h> 19 20/* Specification. */ 21#include "unistr.h" 22 23int 24u16_uctomb_aux (uint16_t *s, ucs4_t uc, int n) 25{ 26 if (uc < 0xd800) 27 { 28 /* The case n >= 1 is already handled by the caller. */ 29 } 30 else if (uc < 0x10000) 31 { 32 if (uc >= 0xe000) 33 { 34 if (n >= 1) 35 { 36 s[0] = uc; 37 return 1; 38 } 39 } 40 else 41 return -1; 42 } 43 else 44 { 45 if (uc < 0x110000) 46 { 47 if (n >= 2) 48 { 49 s[0] = 0xd800 + ((uc - 0x10000) >> 10); 50 s[1] = 0xdc00 + ((uc - 0x10000) & 0x3ff); 51 return 2; 52 } 53 } 54 else 55 return -1; 56 } 57 return -2; 58} 59