readline.c: initialize before rl_refresh_line

* ext/readline/readline.c (readline_s_refresh_line): initialize
  before rl_refresh_line(), as some function make the internal
  state non-clean but rl_refresh_line() does not re-initialize it.
  [ruby-core:43957] [Bug #6232]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49244 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 30 insertions, 17 deletions

diff --git a/ext/readline/readline.c b/ext/readline/readline.c
index 5e78af4b07..140bd7f578 100644
--- a/ext/readline/readline.c
+++ b/ext/readline/readline.c
@@ -359,6 +359,34 @@ clear_rl_outstream(void)
     readline_outstream = Qfalse;
 }
 
+static void
+prepare_readline(void)
+{
+    static int initialized = 0;
+    if (!initialized) {
+	rl_initialize();
+	initialized = 1;
+    }
+
+    if (readline_instream) {
+        rb_io_t *ifp;
+        rb_io_check_initialized(ifp = RFILE(rb_io_taint_check(readline_instream))->fptr);
+        if (ifp->fd < 0) {
+            clear_rl_instream();
+            rb_raise(rb_eIOError, "closed readline input");
+        }
+    }
+
+    if (readline_outstream) {
+        rb_io_t *ofp;
+        rb_io_check_initialized(ofp = RFILE(rb_io_taint_check(readline_outstream))->fptr);
+        if (ofp->fd < 0) {
+            clear_rl_outstream();
+            rb_raise(rb_eIOError, "closed readline output");
+        }
+    }
+}
+
 /*
  * call-seq:
  *   Readline.readline(prompt = "", add_hist = false) -> string or nil
@@ -460,23 +488,7 @@ readline_readline(int argc, VALUE *argv, VALUE self)
         prompt = RSTRING_PTR(tmp);
     }
 
-    if (readline_instream) {
-        rb_io_t *ifp;
-        rb_io_check_initialized(ifp = RFILE(rb_io_taint_check(readline_instream))->fptr);
-        if (ifp->fd < 0) {
-            clear_rl_instream();
-            rb_raise(rb_eIOError, "closed readline input");
-        }
-    }
-
-    if (readline_outstream) {
-        rb_io_t *ofp;
-        rb_io_check_initialized(ofp = RFILE(rb_io_taint_check(readline_outstream))->fptr);
-        if (ofp->fd < 0) {
-            clear_rl_outstream();
-            rb_raise(rb_eIOError, "closed readline output");
-        }
-    }
+    prepare_readline();
 
 #ifdef _WIN32
     rl_prep_terminal(1);
@@ -1549,6 +1561,7 @@ readline_s_get_filename_quote_characters(VALUE self, VALUE str)
 static VALUE
 readline_s_refresh_line(VALUE self)
 {
+    prepare_readline();
     rl_refresh_line(0, 0);
     return Qnil;
 }