* transcode.c, include/ruby/encoding.c (rb_transcode_convertible):

	  new function. checking the existance of converter.



git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@19565 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 14 insertions, 0 deletions

diff --git a/transcode.c b/transcode.c
index 26c57d039..1f0909cd3 100644
--- a/transcode.c
+++ b/transcode.c
@@ -2839,6 +2839,20 @@ econv_s_search_convpath(int argc, VALUE *argv, VALUE klass)
     return convpath;
 }
 
+/*
+ * check the existance of converter.
+ * returns the count of the converting paths.
+ * result: >=0:success -1:failure
+ */
+int
+rb_transcode_convertible(const char* from_encoding, const char* to_encoding)
+{
+    VALUE convpath = Qnil;
+    transcode_search_path(from_encoding, to_encoding, search_convpath_i,
+			  &convpath);
+    return RTEST(convpath);
+}
+
 struct rb_econv_init_by_convpath_t {
     rb_econv_t *ec;
     int index;