1 files changed, 38 insertions, 0 deletions
diff --git a/src/io_helper.c b/src/io_helper.c
new file mode 100644
index 0000000..f4fa088
--- /dev/null
+++ b/src/io_helper.c
@@ -0,0 +1,38 @@
+#include <stdlib.h>
+#include <sys/select.h>
+
+int timed_read(int timeout)
+{
+    char byte;
+
+    if (timeout >= 0) {
+        fd_set readfds;
+        struct timeval t;
+
+        FD_ZERO(&readfds);
+        FD_SET(0, &readfds);
+
+        t.tv_sec  = timeout / 1000000;
+        t.tv_usec = timeout % 1000000;
+
+        if (select(1, &readfds, NULL, NULL, &t) == 1) {
+            if (read(0, &byte, 1) == 1) {
+                return byte;
+            }
+            else {
+                return -1;
+            }
+        }
+        else {
+            return -1;
+        }
+    }
+    else {
+        if (read(0, &byte, 1) == 1) {
+            return byte;
+        }
+        else {
+            return -1;
+        }
+    }
+}