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/*
* 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);
}
}
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