Implemented the symbolfile command (as mentioned by the help
command). This reads a symbol file in the format generated by nm.
diff --git a/debugger/debug.l b/debugger/debug.l
index fd31b35..e7b24c0 100644
--- a/debugger/debug.l
+++ b/debugger/debug.l
@@ -142,6 +142,7 @@
<INITIAL>mode { BEGIN(NOCMD); return tMODE; }
<INITIAL>show|sho|sh { BEGIN(SHOW_CMD); return tSHOW; }
+<INITIAL>symbolfile|symbols|symbol|sf { BEGIN(PATH_EXPECTED); return tSYMBOLFILE; }
<INITIAL,INFO_CMD,DEL_CMD>break|brea|bre|br|b { BEGIN(PATH_EXPECTED); return tBREAK; }
