1/* Look at first character in UTF-16 string. 2 Copyright (C) 1999-2002, 2006-2007, 2009-2010 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 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#if defined IN_LIBUNISTRING 21/* Tell unistr.h to declare u16_mbtouc as 'extern', not 'static inline'. */ 22# include "unistring-notinline.h" 23#endif 24 25/* Specification. */ 26#include "unistr.h" 27 28#if !HAVE_INLINE 29 30int 31u16_mbtouc (ucs4_t *puc, const uint16_t *s, size_t n) 32{ 33 uint16_t c = *s; 34 35 if (c < 0xd800 || c >= 0xe000) 36 { 37 *puc = c; 38 return 1; 39 } 40 if (c < 0xdc00) 41 { 42 if (n >= 2) 43 { 44 if (s[1] >= 0xdc00 && s[1] < 0xe000) 45 { 46 *puc = 0x10000 + ((c - 0xd800) << 10) + (s[1] - 0xdc00); 47 return 2; 48 } 49 /* invalid multibyte character */ 50 } 51 else 52 { 53 /* incomplete multibyte character */ 54 } 55 } 56 /* invalid multibyte character */ 57 *puc = 0xfffd; 58 return 1; 59} 60 61#endif 62