90 lines
3.1 KiB
C++
90 lines
3.1 KiB
C++
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/*
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* Copyright (C) 2014 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <assert.h>
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#include <errno.h>
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#include <uchar.h>
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#include <wchar.h>
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#include "private/bionic_mbstate.h"
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static inline bool mbspartialc16(const mbstate_t* state) {
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return mbstate_get_byte(state, 3) != 0;
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}
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static size_t begin_surrogate(char32_t c32, char16_t* pc16,
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size_t nconv, mbstate_t* state) {
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c32 -= 0x10000;
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char16_t trail = (c32 & 0x3ff) | 0xdc00;
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mbstate_set_byte(state, 0, trail & 0x00ff);
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mbstate_set_byte(state, 1, (trail & 0xff00) >> 8);
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mbstate_set_byte(state, 3, nconv & 0xff);
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*pc16 = ((c32 & 0xffc00) >> 10) | 0xd800;
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// Defined by POSIX as return value for first surrogate character.
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return static_cast<size_t>(-3);
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}
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static size_t finish_surrogate(char16_t* pc16, mbstate_t* state) {
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char16_t trail = mbstate_get_byte(state, 1) << 8 |
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mbstate_get_byte(state, 0);
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*pc16 = trail;
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return reset_and_return(mbstate_get_byte(state, 3), state);
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}
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size_t mbrtoc16(char16_t* pc16, const char* s, size_t n, mbstate_t* ps) {
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static mbstate_t __private_state;
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mbstate_t* state = (ps == NULL) ? &__private_state : ps;
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char16_t __private_pc16;
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if (pc16 == NULL) {
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pc16 = &__private_pc16;
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}
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if (mbspartialc16(state)) {
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return finish_surrogate(pc16, state);
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}
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char32_t c32;
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size_t nconv = mbrtoc32(&c32, s, n, state);
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if (__MB_IS_ERR(nconv)) {
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return nconv;
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} else if (nconv == 0) {
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return reset_and_return(nconv, state);
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} else if (c32 > 0x10ffff) {
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// Input cannot be encoded as UTF-16.
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return reset_and_return_illegal(EILSEQ, state);
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} else if (c32 < 0x10000) {
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*pc16 = static_cast<char16_t>(c32);
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return reset_and_return(nconv, state);
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} else {
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return begin_surrogate(c32, pc16, nconv, state);
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}
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}
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