1 /* Store a character in UTF-16 string. 2 Copyright (C) 2002, 2005-2006, 2009-2021 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2002. 4 5 This file is free software. 6 It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+". 7 You can redistribute it and/or modify it under either 8 - the terms of the GNU Lesser General Public License as published 9 by the Free Software Foundation; either version 3, or (at your 10 option) any later version, or 11 - the terms of the GNU General Public License as published by the 12 Free Software Foundation; either version 2, or (at your option) 13 any later version, or 14 - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+". 15 16 This file is distributed in the hope that it will be useful, 17 but WITHOUT ANY WARRANTY; without even the implied warranty of 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 Lesser General Public License and the GNU General Public License 20 for more details. 21 22 You should have received a copy of the GNU Lesser General Public 23 License and of the GNU General Public License along with this 24 program. If not, see <https://www.gnu.org/licenses/>. */ 25 26 #include <config.h> 27 28 #if defined IN_LIBUNISTRING 29 /* Tell unistr.h to declare u16_uctomb as 'extern', not 'static inline'. */ 30 # include "unistring-notinline.h" 31 #endif 32 33 /* Specification. */ 34 #include "unistr.h" 35 36 #if !HAVE_INLINE 37 38 int 39 u16_uctomb (uint16_t *s, ucs4_t uc, ptrdiff_t n) /* */ 40 { 41 if (uc < 0xd800) 42 { 43 if (n > 0) 44 { 45 s[0] = uc; 46 return 1; 47 } 48 /* else return -2, below. */ 49 } 50 else if (uc < 0x10000) 51 { 52 if (uc >= 0xe000) 53 { 54 if (n >= 1) 55 { 56 s[0] = uc; 57 return 1; 58 } 59 } 60 else 61 return -1; 62 } 63 else 64 { 65 if (uc < 0x110000) 66 { 67 if (n >= 2) 68 { 69 s[0] = 0xd800 + ((uc - 0x10000) >> 10); 70 s[1] = 0xdc00 + ((uc - 0x10000) & 0x3ff); 71 return 2; 72 } 73 } 74 else 75 return -1; 76 } 77 return -2; 78 } 79 80 #endif