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LibC: Implement ungetwc()

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This commit is contained in:
Ali Mohammad Pur 2021-12-19 23:29:21 +03:30 • committed by Ali Mohammad Pur
parent 14b91a3fe9
commit e717ca32d1
7 changed files with 63 additions and 18 deletions
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9
Userland/Libraries/LibC/bits/stdio_file_implementation.h
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@ -4,9 +4,11 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Array.h>
#include <AK/Types.h>
#include <LibC/bits/FILE.h>
#include <LibC/bits/pthread_integration.h>
#include <LibC/bits/wchar.h>
#include <sys/types.h>
#pragma once
@ -85,6 +87,9 @@ private:
bool enqueue_front(u8 byte);
private:
constexpr static auto unget_buffer_size = MB_CUR_MAX;
constexpr static u32 ungotten_mask = ((u32)0xffffffff) >> (sizeof(u32) * 8 - unget_buffer_size);
// Note: the fields here are arranged this way
// to make sizeof(Buffer) smaller.
u8* m_data { nullptr };
@ -93,8 +98,8 @@ private:
size_t m_end { 0 };
int m_mode { -1 };
u8 m_unget_buffer { 0 };
bool m_ungotten : 1 { false };
Array<u8, unget_buffer_size> m_unget_buffer { 0 };
u32 m_ungotten : unget_buffer_size { 0 };
bool m_data_is_malloced : 1 { false };
// When m_begin == m_end, we want to distinguish whether
// the buffer is full or empty.

10
Userland/Libraries/LibC/bits/wchar.h Normal file
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@ -0,0 +1,10 @@
/*
* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#define MB_CUR_MAX 4
#define MB_LEN_MAX 16