billions must commit

1 files changed, 75 insertions, 0 deletions

diff --git a/src/Terminal.c b/src/Terminal.c
new file mode 100644
index 0000000..6cc24db
--- /dev/null
+++ b/src/Terminal.c
@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+
+#include "Globals.h"
+#include "Terminal.h"
+
+static struct termios orig_term;
+
+int tty_fd = -1;
+int tty_out_fd = -1;
+int orig_stdout = -1;
+int stdin_is_tty = 0;
+
+void restore_terminal(void) {
+  if (tty_fd >= 0) {
+    tcsetattr(tty_fd, TCSAFLUSH, &orig_term);
+  }
+  
+  int restore_fd = tty_out_fd >= 0 ? tty_out_fd : STDOUT_FILENO;
+  dprintf(restore_fd, "\033[?1049l\033[2J\033[?25h\033[0m");
+  
+  if (tty_fd >= 0) {
+    close(tty_fd);
+  }
+  if (tty_out_fd >= 0 && tty_out_fd != STDOUT_FILENO) {
+    close(tty_out_fd);
+  }
+  if (orig_stdout >= 0 && orig_stdout != STDOUT_FILENO) {
+    close(orig_stdout);
+  }
+}
+
+static void handle_signal(int sig) {
+  restore_terminal();
+  _exit(128 + sig);
+}
+
+void setup_terminal(void) {
+  signal(SIGINT, handle_signal);
+  signal(SIGTERM, handle_signal);
+  
+  if (isatty(STDOUT_FILENO)) {
+    tty_out_fd = STDOUT_FILENO;
+  } else {
+    tty_out_fd = open("/dev/tty", O_WRONLY);
+    if (tty_out_fd < 0) {
+      fprintf(stderr, "Error: cannot open terminal for output\n");
+      exit(1);
+    }
+  }
+
+  tty_fd = open("/dev/tty", O_RDWR);
+  if (tty_fd < 0) {
+    tty_fd = dup(STDIN_FILENO);
+  }
+
+  if (tty_fd < 0) {
+    dprintf(tty_out_fd, "\033[?1049l\033[2J\033[?25h");
+    close(tty_out_fd);
+    fprintf(stderr, "Error: cannot open terminal for keyboard input\n");
+    exit(1);
+  }
+
+  struct termios t;
+  tcgetattr(tty_fd, &orig_term);
+  atexit(restore_terminal);
+  tcgetattr(tty_fd, &t);
+  t.c_lflag &= ~(ICANON | ECHO);
+  tcsetattr(tty_fd, TCSAFLUSH, &t);
+  dprintf(tty_out_fd, "\033[?1049l\033[2J\033[?25l");
+}