diff --git a/c/src/lib/libchip/serial/sersupp.c b/c/src/lib/libchip/serial/sersupp.c
new file mode 100644
index 0000000000..12f657261c
--- /dev/null
+++ b/c/src/lib/libchip/serial/sersupp.c
@@ -0,0 +1,37 @@
+/*
+ *  $Id$
+ */
+
+#include <sys/termios.h>
+
+int termios_baud_to_index(
+  int termios_baud
+)
+{
+  int baud_index;
+
+  switch (termios_baud) {
+    case B0:        baud_index =  0;  break;
+    case B50:       baud_index =  1;  break;
+    case B75:       baud_index =  2;  break;
+    case B110:      baud_index =  3;  break;
+    case B134:      baud_index =  4;  break;
+    case B150:      baud_index =  5;  break;
+    case B200:      baud_index =  6;  break;
+    case B300:      baud_index =  7;  break;
+    case B600:      baud_index =  8;  break;
+    case B1200:     baud_index =  9;  break;
+    case B1800:     baud_index = 10;  break;
+    case B2400:     baud_index = 11;  break;
+    case B4800:     baud_index = 12;  break;
+    case B9600:     baud_index = 13;  break;
+    case B19200:    baud_index = 14;  break;
+    case B38400:    baud_index = 15;  break;
+    case B57600:    baud_index = 16;  break;
+    case B115200:   baud_index = 17;  break;
+    case B230400:   baud_index = 18;  break;
+    case B460800:   baud_index = 19;  break;
+    default:        baud_index = -1;  break;
+  }
+}
+
diff --git a/c/src/lib/libchip/serial/sersupp.h b/c/src/lib/libchip/serial/sersupp.h
new file mode 100644
index 0000000000..37b758107e
--- /dev/null
+++ b/c/src/lib/libchip/serial/sersupp.h
@@ -0,0 +1,13 @@
+/*
+ *  $Id$
+ */
+
+#ifndef __LIBCHIP_SERIAL_SUPPORT_h
+#define __LIBCHIP_SERIAL_SUPPORT_h
+
+int termios_baud_to_index(
+  int termios_baud
+);
+
+#endif
+/* end of include file */
diff --git a/c/src/libchip/serial/sersupp.h b/c/src/libchip/serial/sersupp.h
new file mode 100644
index 0000000000..37b758107e
--- /dev/null
+++ b/c/src/libchip/serial/sersupp.h
@@ -0,0 +1,13 @@
+/*
+ *  $Id$
+ */
+
+#ifndef __LIBCHIP_SERIAL_SUPPORT_h
+#define __LIBCHIP_SERIAL_SUPPORT_h
+
+int termios_baud_to_index(
+  int termios_baud
+);
+
+#endif
+/* end of include file */