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https://github.com/xcat2/confluent.git
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d3a699a8fb
If a terminal is open during autocons, that terminal will be the size of the console. Otherwise, fallback to 100x31.
128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
#include <errno.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#define COM1 0x3f8
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#define COM2 0x2f8
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#define COM3 0x3e8
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#define COM4 0x2e8
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#define SPEEDNOOP 0
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#define SPEED9600 3
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#define SPEED19200 4
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#define SPEED57600 6
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#define SPEED115200 7
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int main(int argc, char* argv[]) {
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struct termios tty;
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struct termios tty2;
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struct winsize ws;
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unsigned width, height;
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int ttyf;
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int tmpi;
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int currspeed;
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int flags;
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speed_t cspeed;
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char buff[128];
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int bufflen;
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fd_set set;
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struct timeval timeout;
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char* offset;
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uint64_t address;
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bufflen = 0;
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tmpi = open("/sys/firmware/acpi/tables/SPCR", O_RDONLY);
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if (tmpi < 0) {
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exit(0);
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}
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if (read(tmpi, buff, 80) < 80) {
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exit(0);
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}
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close(tmpi);
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if (buff[8] != 2) exit(0); //revision 2
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if (buff[36] != 0) exit(0); //16550 only
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if (buff[40] != 1) exit(0); //IO only
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address = *(uint64_t *)(buff + 44);
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currspeed = buff[58];
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offset = buff + 10;
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if (address == COM1) {
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strncpy(buff, "/dev/ttyS0", 128);
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} else if (address == COM2) {
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strncpy(buff, "/dev/ttyS1", 128);
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} else if (address == COM3) {
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strncpy(buff, "/dev/ttyS2", 128);
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} else if (address == COM4) {
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strncpy(buff, "/dev/ttyS3", 128);
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} else {
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exit(0);
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}
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ttyf = open(buff, O_RDWR | O_NOCTTY);
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if (currspeed == SPEED9600) {
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cspeed = B9600;
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strcpy(offset, ",9600");
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} else if (currspeed == SPEED19200) {
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cspeed = B19200;
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strcpy(offset, ",19200");
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} else if (currspeed == SPEED57600) {
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cspeed = B57600;
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strcpy(offset, ",57600");
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} else if (currspeed == SPEED115200) {
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cspeed = B115200;
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strcpy(offset, ",115200");
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} else {
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exit(0);
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}
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tcgetattr(ttyf, &tty);
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if (cspeed) {
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cfsetospeed(&tty, cspeed);
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cfsetispeed(&tty, cspeed);
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}
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printf("%s\n", buff);
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tcgetattr(ttyf, &tty2);
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cfmakeraw(&tty2);
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tcsetattr(ttyf, TCSANOW, &tty2);
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flags = fcntl(ttyf, F_GETFL, 0);
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fcntl(ttyf, F_SETFL, flags | O_NONBLOCK);
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while (read(ttyf, buff, 64) > 0) {
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// Drain any pending reads
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}
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timeout.tv_sec = 0;
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timeout.tv_usec = 500000;
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FD_ZERO(&set);
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FD_SET(ttyf, &set);
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write(ttyf, "\0337\033[999;999H\033[6n\0338", 18);
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while (select(ttyf + 1, &set, NULL, NULL, &timeout) > 0) {
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if ((tmpi = read(ttyf, buff + bufflen, 127 - bufflen)) < 0) {
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if (errno == EAGAIN || errno == EWOULDBLOCK) {
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continue;
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} else {
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break;
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}
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}
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bufflen += tmpi;
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buff[bufflen] = 0;
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if (strchr(buff, 'R')) {
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break;
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}
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}
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fcntl(ttyf, F_SETFL, flags);
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ws.ws_xpixel = 0;
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ws.ws_ypixel = 0;
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if (sscanf(buff, "\033[%u;%uR", &height, &width) == 2) {
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ws.ws_col = width;
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ws.ws_row = height;
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} else {
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ws.ws_col = 100;
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ws.ws_row = 31;
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}
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ioctl(ttyf, TIOCSWINSZ, &ws);
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tcsetattr(ttyf, TCSANOW, &tty);
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ioctl(ttyf, TIOCCONS, 0);
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}
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