dingusppc/devices/serial/chario.cpp
2022-05-21 14:51:28 +02:00

143 lines
3.2 KiB
C++

/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** Character I/O backend implementations. */
#include <devices/serial/chario.h>
#include <loguru.hpp>
#include <cinttypes>
#include <memory>
bool CharIoNull::rcv_char_available()
{
return false;
}
int CharIoNull::xmit_char(uint8_t c)
{
return 0;
}
int CharIoNull::rcv_char(uint8_t *c)
{
*c = 0xFF;
return 0;
}
//======================== STDIO character I/O backend ========================
#ifndef _WIN32
#include<signal.h>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
struct sigaction old_act, new_act;
struct termios orig_termios;
void mysig_handler(int signum)
{
// restore original terminal state
tcsetattr(STDIN_FILENO, TCSANOW, &orig_termios);
// restore original signal handler for SIGINT
signal(SIGINT, old_act.sa_handler);
LOG_F(INFO, "Old terminal state restored, SIG#=%d", signum);
// re-post signal
raise(signum);
}
int CharIoStdin::rcv_enable()
{
if (this->stdio_inited)
return 0;
// save original terminal state
tcgetattr(STDIN_FILENO, &orig_termios);
struct termios new_termios = orig_termios;
new_termios.c_cflag &= ~(CSIZE | PARENB);
new_termios.c_cflag |= CS8;
new_termios.c_lflag &= ~(ECHO | ICANON | ISIG);
new_termios.c_iflag &= ~(ICRNL);
tcsetattr(STDIN_FILENO, TCSANOW, &new_termios);
// save original signal handler for SIGINT
// then redirect SIGINT to new handler
memset(&new_act, 0, sizeof(new_act));
new_act.sa_handler = mysig_handler;
sigaction(SIGINT, &new_act, &old_act);
this->stdio_inited = true;
return 0;
}
void CharIoStdin::rcv_disable()
{
if (!this->stdio_inited)
return;
// restore original terminal state
tcsetattr(STDIN_FILENO, TCSANOW, &orig_termios);
// restore original signal handler for SIGINT
signal(SIGINT, old_act.sa_handler);
this->stdio_inited = false;
}
bool CharIoStdin::rcv_char_available()
{
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(STDIN_FILENO, &readfds);
fd_set savefds = readfds;
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 0;
int chr;
int sel_rv = select(1, &readfds, NULL, NULL, &timeout);
return sel_rv > 0;
}
int CharIoStdin::xmit_char(uint8_t c)
{
write(STDOUT_FILENO, &c, 1);
return 0;
}
int CharIoStdin::rcv_char(uint8_t *c)
{
read(STDIN_FILENO, c, 1);
return 0;
}
#endif // _WIN32