| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <errno.h> |
| #include <uchar.h> |
| #include <wchar.h> |
| |
| #include "private/bionic_mbstate.h" |
| |
| static inline constexpr bool is_high_surrogate(char16_t c16) { |
| return c16 >= 0xd800 && c16 < 0xdc00; |
| } |
| |
| static inline constexpr bool is_low_surrogate(char16_t c16) { |
| return c16 >= 0xdc00 && c16 < 0xe000; |
| } |
| |
| size_t c16rtomb(char* s, char16_t c16, mbstate_t* ps) { |
| static mbstate_t __private_state; |
| mbstate_t* state = (ps == NULL) ? &__private_state : ps; |
| if (mbsinit(state)) { |
| if (is_high_surrogate(c16)) { |
| char32_t c32 = (c16 & ~0xd800) << 10; |
| mbstate_set_byte(state, 3, (c32 & 0xff0000) >> 16); |
| mbstate_set_byte(state, 2, (c32 & 0x00ff00) >> 8); |
| return 0; |
| } else if (is_low_surrogate(c16)) { |
| return reset_and_return_illegal(EINVAL, state); |
| } else { |
| return c32rtomb(s, static_cast<char32_t>(c16), state); |
| } |
| } else { |
| if (!is_low_surrogate(c16)) { |
| return reset_and_return_illegal(EINVAL, state); |
| } |
| |
| char32_t c32 = ((mbstate_get_byte(state, 3) << 16) | |
| (mbstate_get_byte(state, 2) << 8) | |
| (c16 & ~0xdc00)) + 0x10000; |
| return reset_and_return(c32rtomb(s, c32, NULL), state); |
| } |
| } |