Make terminal ui binaries work well everywhere
Here's some screenshots of an emulator tui program that was compiled on Linux, then scp'd it to Windows, Mac, and FreeBSD. https://justine.storage.googleapis.com/blinkenlights-cmdexe.png https://justine.storage.googleapis.com/blinkenlights-imac.png https://justine.storage.googleapis.com/blinkenlights-freebsd.png https://justine.storage.googleapis.com/blinkenlights-lisp.png How is this even possible that we have a nontrivial ui binary that just works on Mac, Windows, Linux, and BSD? Surely a first ever achievement. Fixed many bugs. Bootstrapped John McCarthy's metacircular evaluator on bare metal in half the size of Altair BASIC (about 2.5kb) and ran it in emulator for fun and profit.
This commit is contained in:
Justine Tunney
@ -16,7 +16,6 @@
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#include "libc/fmt/fmt.h"
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#include "libc/log/check.h"
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#include "libc/log/log.h"
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#include "libc/runtime/gc.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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@ -27,82 +26,138 @@
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#include "libc/sysv/consts/termios.h"
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#include "libc/x/x.h"
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/*
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"\e[c" → "\e[?1;2c"
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"\e[x" → "\e[2;1;1;112;112;1;0x"
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"\e[>c" → "\e[>83;40500;0c"
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"\e[6n" → "\e[52;1R"
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*/
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#define CTRL(C) ((C) ^ 0b01000000)
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#define ENABLE_MOUSE_TRACKING "\e[?1000;1002;1015;1006h"
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#define DISABLE_MOUSE_TRACKING "\e[?1000;1002;1015;1006l"
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#define PROBE_DISPLAY_SIZE "\e7\e[9979;9979H\e[6n\e8"
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#define CTRL(C) ((C) ^ 0b01000000)
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#define PROBE_VT100 "\e[c" /* e.g. "\e[?1;2c", "\e[>0c" */
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#define PROBE_SECONDARY "\e[>c" /* "\e[>83;40500;0c" (Screen v4.05.00) */
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#define PROBE_PARAMETERS "\e[x" /* e.g. "\e[2;1;1;112;112;1;0x" */
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#define PROBE_CURSOR_POSITION "\e[6n" /* e.g. "\e[𝑦;𝑥R" */
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#define PROBE_SUN_DTTERM_SIZE "\e[14t" /* e.g. "\e[𝑦;𝑥R" */
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char code[512];
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struct winsize wsize;
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struct termios oldterm;
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volatile bool resized, killed;
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int fd_;
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jmp_buf jb_;
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ssize_t got_;
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uint8_t buf_[128];
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struct TtyIdent ti_;
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struct winsize wsize_;
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volatile bool resized_;
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void OnResize(void) {
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resized_ = true;
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}
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void OnKilled(int sig) {
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longjmp(jb_, 128 + sig + 1);
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void onresize(void) {
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resized = true;
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}
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void getsome(void) {
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if ((got_ = read(fd_, buf_, sizeof(buf_))) == -1 && errno != EINTR) {
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printf("%s%s\r\n", "error: ", strerror(errno));
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longjmp(jb_, EXIT_FAILURE + 1);
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void onkilled(int sig) {
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killed = true;
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}
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void restoretty(void) {
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write(1, DISABLE_MOUSE_TRACKING, strlen(DISABLE_MOUSE_TRACKING));
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ioctl(1, TCSETS, &oldterm);
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}
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int rawmode(void) {
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static bool once;
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struct termios t;
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if (!once) {
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if (ioctl(1, TCGETS, &oldterm) != -1) {
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atexit(restoretty);
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} else {
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return -1;
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}
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once = true;
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}
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if (got_ >= 0) {
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printf("%`'.*s\r\n", got_, buf_);
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if (got_ > 0 && buf_[0] == CTRL('C')) {
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longjmp(jb_, EXIT_SUCCESS + 1);
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memcpy(&t, &oldterm, sizeof(t));
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t.c_cc[VMIN] = 1;
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t.c_cc[VTIME] = 1;
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t.c_iflag &= ~(INPCK | ISTRIP | PARMRK | INLCR | IGNCR | ICRNL | IXON |
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IGNBRK | BRKINT);
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t.c_lflag &= ~(IEXTEN | ICANON | ECHO | ECHONL | ISIG);
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t.c_cflag &= ~(CSIZE | PARENB);
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t.c_oflag &= ~OPOST;
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t.c_cflag |= CS8;
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t.c_iflag |= IUTF8;
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ioctl(1, TCSETS, &t);
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write(1, ENABLE_MOUSE_TRACKING, strlen(ENABLE_MOUSE_TRACKING));
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write(1, PROBE_DISPLAY_SIZE, strlen(PROBE_DISPLAY_SIZE));
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return 0;
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}
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void getsize(void) {
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if (getttysize(1, &wsize) != -1) {
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printf("termios says terminal size is %hu×%hu\r\n", wsize.ws_col,
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wsize.ws_row);
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} else {
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printf("%s\n", strerror(errno));
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}
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}
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const char *describemouseevent(int e) {
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static char buf[64];
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buf[0] = 0;
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if (e & 0x10) {
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strcat(buf, " ctrl");
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}
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if (e & 0x40) {
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strcat(buf, " wheel");
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if (e & 0x01) {
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strcat(buf, " down");
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} else {
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strcat(buf, " up");
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}
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} else {
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switch (e & 3) {
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case 0:
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strcat(buf, " left");
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break;
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case 1:
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strcat(buf, " middle");
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break;
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case 2:
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strcat(buf, " right");
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break;
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default:
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unreachable;
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}
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if (e & 0x20) {
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strcat(buf, " drag");
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} else if (e & 0x04) {
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strcat(buf, " up");
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} else {
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strcat(buf, " down");
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}
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}
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if (resized_) {
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CHECK_NE(-1, getttysize(fd_, &wsize_));
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printf("SIGWINCH → %hu×%hu\r\n", wsize_.ws_row, wsize_.ws_col);
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resized_ = false;
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}
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}
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void probe(const char *s) {
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printf("%`'s → ", s);
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write(fd_, s, strlen(s));
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getsome();
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return buf + 1;
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}
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int main(int argc, char *argv[]) {
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int rc;
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char ttyname[64];
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struct termios old;
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CHECK_NE(-1, (fd_ = open("/dev/tty", O_RDWR)));
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CHECK_NE(-1, ttyconfig(fd_, ttysetrawmode, 0, &old));
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if (!(rc = setjmp(jb_))) {
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xsigaction(SIGTERM, OnKilled, 0, 0, NULL);
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xsigaction(SIGWINCH, OnResize, 0, 0, NULL);
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if (ttyident(&ti_, STDIN_FILENO, STDOUT_FILENO) != -1) {
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ttysendtitle(fd_, "justine was here", &ti_);
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fputs(ttydescribe(ttyname, sizeof(ttyname), &ti_), stdout);
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int e, c, y, x, n, yn, xn;
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xsigaction(SIGTERM, onkilled, 0, 0, NULL);
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xsigaction(SIGWINCH, onresize, 0, 0, NULL);
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xsigaction(SIGCONT, onresize, 0, 0, NULL);
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rawmode();
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getsize();
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while (!killed) {
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if (resized) {
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printf("SIGWINCH ");
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getsize();
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resized = false;
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}
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if ((n = readansi(0, code, sizeof(code))) == -1) {
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if (errno == EINTR) continue;
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printf("ERROR: READ: %s\r\n", strerror(errno));
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exit(1);
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}
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printf("%`'.*s ", n, code);
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if (iscntrl(code[0]) && !code[1]) {
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printf("is CTRL-%c a.k.a. ^%c\r\n", CTRL(code[0]), CTRL(code[0]));
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if (code[0] == CTRL('C') || code[0] == CTRL('D')) break;
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} else if (startswith(code, "\e[") && endswith(code, "R")) {
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yn = 1, xn = 1;
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sscanf(code, "\e[%d;%dR", &yn, &xn);
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printf("inband signalling says terminal size is %d×%d\r\n", xn, yn);
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} else if (startswith(code, "\e[<") &&
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(endswith(code, "m") || endswith(code, "M"))) {
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e = 0, y = 1, x = 1;
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sscanf(code, "\e[<%d;%d;%d%c", &e, &y, &x, &c);
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printf("mouse %s at %d×%d\r\n", describemouseevent(e | (c == 'm') << 2),
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x, y);
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} else {
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printf("\r\n");
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}
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fputs("\r\n", stdout);
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probe(PROBE_VT100);
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probe(PROBE_SECONDARY);
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probe(PROBE_PARAMETERS);
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probe(PROBE_CURSOR_POSITION);
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/* probe(PROBE_SUN_DTTERM_SIZE); */
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getsome();
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for (;;) getsome();
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}
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ttyrestore(fd_, &old);
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ttyidentclear(&ti_);
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return rc - 1;
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return 0;
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}
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