1 files changed, 53 insertions, 0 deletions
diff --git a/fesvr/term.cc b/fesvr/term.cc
new file mode 100644
index 0000000..c4cba0c
--- /dev/null
+++ b/fesvr/term.cc
@@ -0,0 +1,53 @@
+#include "term.h"
+#include <termios.h>
+#include <unistd.h>
+#include <poll.h>
+#include <signal.h>
+#include <stdlib.h>
+
+class canonical_termios_t
+{
+ public:
+  canonical_termios_t()
+   : restore_tios(false)
+  {
+    if (tcgetattr(0, &old_tios) == 0)
+    {
+      struct termios new_tios = old_tios;
+      new_tios.c_lflag &= ~(ICANON | ECHO);
+      if (tcsetattr(0, TCSANOW, &new_tios) == 0)
+        restore_tios = true;
+    }
+  }
+
+  ~canonical_termios_t()
+  {
+    if (restore_tios)
+      tcsetattr(0, TCSANOW, &old_tios);
+  }
+ private:
+  struct termios old_tios;
+  bool restore_tios;
+};
+
+static canonical_termios_t tios; // exit() will clean up for us
+
+int canonical_terminal_t::read()
+{
+  struct pollfd pfd;
+  pfd.fd = 0;
+  pfd.events = POLLIN;
+  int ret = poll(&pfd, 1, 0);
+  if (ret <= 0 || !(pfd.revents & POLLIN))
+    return -1;
+
+  unsigned char ch;
+  ret = ::read(0, &ch, 1);
+  return ret <= 0 ? -1 : ch;
+}
+
+void canonical_terminal_t::write(char ch)
+{
+  if (::write(1, &ch, 1) != 1)
+    abort();
+}