teraterm/teraterm/checkeol.cpp

/*
 * Copyright (C) 2020 TeraTerm 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:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.
 */

#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>
#include <windows.h>

#include "checkeol.h"

// tttypes.h
#define CR   0x0D
#define LF   0x0A

struct CheckEOLData_st {
        BOOL cr_hold;
};

CheckEOLData_t *CheckEOLCreate(void)
{
        CheckEOLData_t *self = (CheckEOLData_t *)calloc(sizeof(CheckEOLData_t), 1);
        return self;
}

void CheckEOLDestroy(CheckEOLData_t *self)
{
        free(self);
}

void CheckEOLClear(CheckEOLData_t *self)
{
        self->cr_hold = FALSE;
}

/**
 *      ����EOL(���s), u32 ���o��������������
 *
 *      �����l�� CheckEOLRet �� OR ������
 *
 *      @retval CheckEOLNoOutput        �����o��������
 *      @retval CheckEOLOutputEOL       ���s�R�[�h���o������
 *      @retval CheckEOLOutputChar      u32�����������o������
 */
CheckEOLRet CheckEOLCheck(CheckEOLData_t *self, unsigned int u32)
{
        // ���������s(CR or LF)�������A
        // ���s������(CR or LF or CR+LF)����������������
        //              ����    CR hold     ���s�o��    CR hold ���X
        //              +-------+-----------+-----------+------------
        //              CR      ����        ������              �Z�b�g����
        //              LF      ����        ����                ��������
        //              ������  ����        ������              ��������
        //              CR      ����        ����                ��������(�z�[���h��������)
        //              LF      ����        ����                �N���A����
        //              ������  ����        ����                �N���A����
        if (self->cr_hold == FALSE) {
                if (u32 == CR) {
                        self->cr_hold = TRUE;
                        return CheckEOLNoOutput;
                }
                else if (u32 == LF) {
                        return CheckEOLOutputEOL;
                }
                else {
                        return CheckEOLOutputChar;
                }
        }
        else {
                if (u32 == CR) {
                        return CheckEOLOutputEOL;
                }
                else if (u32 == LF) {
                        self->cr_hold = FALSE;
                        return CheckEOLOutputEOL;
                }
                else {
                        self->cr_hold = FALSE;
                        return (CheckEOLRet)(CheckEOLOutputEOL | CheckEOLOutputChar);
                }
        }
}