dingusppc/devices/serial/chario.cpp

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/*
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>
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#include <cstring>
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#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 ========================
#ifdef _WIN32
#include <fcntl.h>
#include <io.h>
#include <windows.h>
HANDLE hInput = GetStdHandle(STD_INPUT_HANDLE);
HANDLE hOutput = GetStdHandle(STD_OUTPUT_HANDLE);
DWORD old_in_mode, old_out_mode;
int old_stdin_trans_mode;
void mysig_handler(int signum) {
SetStdHandle(signum, hInput);
SetStdHandle(signum, hOutput);
}
int CharIoStdin::rcv_enable() {
if (this->stdio_inited)
return 0;
GetConsoleMode(hInput, &old_in_mode);
GetConsoleMode(hOutput, &old_out_mode);
DWORD new_in_mode = old_in_mode;
new_in_mode &= ~ENABLE_ECHO_INPUT;
new_in_mode &= ~ENABLE_LINE_INPUT;
new_in_mode &= ~ENABLE_PROCESSED_INPUT;
new_in_mode |= ENABLE_EXTENDED_FLAGS;
new_in_mode |= ENABLE_INSERT_MODE;
new_in_mode |= ENABLE_VIRTUAL_TERMINAL_INPUT;
SetConsoleMode(hInput, new_in_mode);
SetConsoleMode(hOutput, old_out_mode | ENABLE_VIRTUAL_TERMINAL_PROCESSING);
// disable automatic CRLF translation
old_stdin_trans_mode = _setmode(_fileno(stdin), _O_BINARY);
this->stdio_inited = true;
LOG_F(INFO, "Winterm: receiver initialized");
return 0;
}
void CharIoStdin::rcv_disable() {
if (!this->stdio_inited)
return;
// restore original console mode
SetConsoleMode(hInput, old_in_mode);
SetConsoleMode(hOutput, old_out_mode);
// restore original translation mode
_setmode(_fileno(stdin), old_stdin_trans_mode);
this->stdio_inited = false;
LOG_F(INFO, "Winterm: receiver disabled");
}
bool CharIoStdin::rcv_char_available() {
DWORD events;
INPUT_RECORD buffer;
PeekConsoleInput(hInput, &buffer, 1, &events);
return !!(events > 0);
}
int CharIoStdin::xmit_char(uint8_t c) {
_write(_fileno(stdout), &c, 1);
return 0;
}
int CharIoStdin::rcv_char(uint8_t* c) {
_read(_fileno(stdin), c, 1);
return 0;
}
#else // non-Windows OS (Linux, mac OS etc.)
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#include <signal.h>
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#include <stdio.h>
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#include <sys/time.h>
#include <sys/types.h>
#include <sys/select.h>
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#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);
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new_termios.c_iflag &= ~(ICRNL);
tcsetattr(STDIN_FILENO, TCSANOW, &new_termios);
// save original signal handler for SIGINT
// then redirect SIGINT to new handler
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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