Readline diff for undo

readline.diff

diff --git a/libreadline.a b/libreadline.a
index 904a7ab..6c0aec9 100644
Binary files a/libreadline.a and b/libreadline.a differ
diff --git a/readline.c b/readline.c
index 3550b35..8c0a221 100644
--- a/readline.c
+++ b/readline.c
@@ -301,7 +301,7 @@ rl_set_prompt (prompt)
 /* Read a line of input.  Prompt with PROMPT.  An empty PROMPT means
    none.  A return value of NULL means that EOF was encountered. */
 char *
-readline (prompt)
+actual_readline (prompt)
      const char *prompt;
 {
   char *value;
@@ -351,6 +351,38 @@ readline (prompt)
   return (value);
 }
 
+char * last_command = "with no command, so exiting";
+
+char *
+readline (prompt)
+     const char *prompt;
+{
+  char *value;
+
+  value = actual_readline(prompt);
+  if(!strcmp(value, "undo")){
+    printf("undoing '%s'\n", last_command);
+    exit(42);
+  }
+	pid_t pid = fork();
+
+  if (pid == 0) {
+    last_command = value;
+    return value;
+  } else {
+    int status;
+    waitpid(pid, &status, 0);
+    int exitstatus = WEXITSTATUS(status);
+
+    if(exitstatus == 42){
+      return readline(prompt);
+    } else {
+      exit(exitstatus);
+    }
+  }
+}
+
+
 #if defined (READLINE_CALLBACKS)
 #  define STATIC_CALLBACK
 #else
diff --git a/shlib/libreadline.so.6.0 b/shlib/libreadline.so.6.0
index f6058b4..9da9c4b 100755
Binary files a/shlib/libreadline.so.6.0 and b/shlib/libreadline.so.6.0 differ