mirror of
https://github.com/xcat2/confluent.git
synced 2024-11-21 17:11:58 +00:00
2d5a016ad4
For autocons, though it's copying from a static source, use strncpy anyway, despite the length being hardcoded already. This makes static analysis happier. Terminate the buff with a NULL. This is superfluous as the strcpies that preceed are guaranteed to null terminate, or exit the program. In clortho, free(tmps), which is a valid leak, though clortho isn't long running. Also, explicitly return 0, which is ultimately returned by main(). Static analysis could not figure out that padneeded implies that keylen is short of chunk size, so change the check to be expressly the scenario that static analysis was worried about directly, rather than indirectly. Hint to static analysis that we don't care about the time as a time value by masking the lower 32 bit explicitly. This was already happening, but static analysis was afraid that we wanted this as time instead of just some mutating value.
139 lines
3.5 KiB
C
139 lines
3.5 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 (ttyf < 0) {
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fprintf(stderr, "Unable to open tty\n");
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exit(1);
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}
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if (currspeed == SPEED9600) {
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cspeed = B9600;
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strncpy(offset, ",9600", 6);
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} else if (currspeed == SPEED19200) {
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cspeed = B19200;
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strncpy(offset, ",19200", 7);
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} else if (currspeed == SPEED57600) {
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cspeed = B57600;
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strncpy(offset, ",57600", 7);
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} else if (currspeed == SPEED115200) {
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cspeed = B115200;
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strncpy(offset, ",115200", 8);
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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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buff[127] = 0;
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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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if (fcntl(ttyf, F_SETFL, flags | O_NONBLOCK) < 0) {
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fprintf(stderr, "Failed setting flags on tty\n");
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}
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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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if (write(ttyf, "\0337\033[999;999H\033[6n\0338", 18) < 0) {};
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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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if (ws.ws_col < 80) { ws.ws_col = 80; }
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if (ws.ws_row < 24) { ws.ws_col = 24; }
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ioctl(ttyf, TIOCSWINSZ, &ws);
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tcsetattr(ttyf, TCSANOW, &tty);
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if (argc > 1 && (strcmp(argv[1], "-c") == 0)) {
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ioctl(ttyf, TIOCCONS, 0);
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}
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}
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