1/* Look at first character in UTF-16 string. 2 Copyright (C) 1999-2002, 2006-2007 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2001. 4 5 This program is free software: you can redistribute it and/or modify it 6 under the terms of the GNU 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 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 23#if !HAVE_INLINE 24 25int 26u16_mbtouc (ucs4_t *puc, const uint16_t *s, size_t n) 27{ 28 uint16_t c = *s; 29 30 if (c < 0xd800 || c >= 0xe000) 31 { 32 *puc = c; 33 return 1; 34 } 35 if (c < 0xdc00) 36 { 37 if (n >= 2) 38 { 39 if (s[1] >= 0xdc00 && s[1] < 0xe000) 40 { 41 *puc = 0x10000 + ((c - 0xd800) << 10) + (s[1] - 0xdc00); 42 return 2; 43 } 44 /* invalid multibyte character */ 45 } 46 else 47 { 48 /* incomplete multibyte character */ 49 } 50 } 51 /* invalid multibyte character */ 52 *puc = 0xfffd; 53 return 1; 54} 55 56#endif 57