Upversioned the C source tree to '0.0.7-SNAPSHOT', but proposing to start experimental

work towards 0.1.0 in separate source trees.

src/c/repl.c

@@ -0,0 +1,50 @@
+/*
+ * repl.c
+ *
+ * the read/eval/print loop
+ *
+ * (c) 2017 Simon Brooke <simon@journeyman.cc>
+ * Licensed under GPL version 2.0, or, at your option, any later version.
+ */
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <wchar.h>
+#include <signal.h>
+
+#include "memory/consspaceobject.h"
+#include "debug.h"
+#include "ops/intern.h"
+#include "ops/lispops.h"
+#include "memory/stack.h"
+
+/**
+ * @brief Handle an interrupt signal.
+ * 
+ * @param dummy 
+ */
+void int_handler( int dummy ) {
+    wprintf( L"TODO: handle ctrl-C in a more interesting way\n" );
+}
+
+/**
+ * The read/eval/print loop.
+ */
+void repl(  ) {
+    signal( SIGINT, int_handler );
+    debug_print( L"Entered repl\n", DEBUG_REPL );
+
+    struct cons_pointer env =
+        consp( oblist ) ? oblist : make_cons( oblist, NIL );
+
+    /* bottom of stack */
+    struct cons_pointer frame_pointer = make_stack_frame( NIL, NIL, env );
+
+    if ( !nilp( frame_pointer ) ) {
+        lisp_repl( get_stack_frame( frame_pointer ), frame_pointer, env );
+
+        dec_ref( frame_pointer );
+    }
+
+    debug_print( L"Leaving repl\n", DEBUG_REPL );
+}