1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <errno.h> 30 #include <uchar.h> 31 #include <wchar.h> 32 33 #include "private/bionic_mbstate.h" 34 35 static inline constexpr bool is_high_surrogate(char16_t c16) { 36 return c16 >= 0xd800 && c16 < 0xdc00; 37 } 38 39 static inline constexpr bool is_low_surrogate(char16_t c16) { 40 return c16 >= 0xdc00 && c16 < 0xe000; 41 } 42 43 size_t c16rtomb(char* s, char16_t c16, mbstate_t* ps) { 44 static mbstate_t __private_state; 45 mbstate_t* state = (ps == NULL) ? &__private_state : ps; 46 if (mbsinit(state)) { 47 if (is_high_surrogate(c16)) { 48 char32_t c32 = (c16 & ~0xd800) << 10; 49 mbstate_set_byte(state, 3, (c32 & 0xff0000) >> 16); 50 mbstate_set_byte(state, 2, (c32 & 0x00ff00) >> 8); 51 return 0; 52 } else if (is_low_surrogate(c16)) { 53 return mbstate_reset_and_return_illegal(EINVAL, state); 54 } else { 55 return c32rtomb(s, static_cast<char32_t>(c16), state); 56 } 57 } else { 58 if (!is_low_surrogate(c16)) { 59 return mbstate_reset_and_return_illegal(EINVAL, state); 60 } 61 62 char32_t c32 = ((mbstate_get_byte(state, 3) << 16) | 63 (mbstate_get_byte(state, 2) << 8) | 64 (c16 & ~0xdc00)) + 0x10000; 65 return mbstate_reset_and_return(c32rtomb(s, c32, NULL), state); 66 } 67 } 68
