usa	2008-09-26 11:07:19 +0900 (Fri, 26 Sep 2008)

  New Revision: 19565

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=19565

  Log:
    * transcode.c, include/ruby/encoding.c (rb_transcode_convertible):
      new function. checking the existance of converter.

  Modified files:
    trunk/ChangeLog
    trunk/include/ruby/encoding.h
    trunk/transcode.c

Index: include/ruby/encoding.h
===================================================================
--- include/ruby/encoding.h	(revision 19564)
+++ include/ruby/encoding.h	(revision 19565)
@@ -209,6 +209,7 @@
 typedef struct rb_econv_t rb_econv_t;
 
 VALUE rb_str_transcode(VALUE str, VALUE to, int ecflags, VALUE ecopts);
+int rb_transcode_convertible(const char* from_encoding, const char* to_encoding);
 
 int rb_econv_prepare_opts(VALUE opthash, VALUE *ecopts);
 
Index: ChangeLog
===================================================================
--- ChangeLog	(revision 19564)
+++ ChangeLog	(revision 19565)
@@ -1,3 +1,8 @@
+Fri Sep 26 11:05:41 2008  NAKAMURA Usaku  <usa@r...>
+
+	* transcode.c, include/ruby/encoding.c (rb_transcode_convertible):
+	  new function. checking the existance of converter.
+
 Fri Sep 26 10:35:50 2008  Nobuyoshi Nakada  <nobu@r...>
 
 	* variable.c (global_variable, struct trace_var): made function
Index: transcode.c
===================================================================
--- transcode.c	(revision 19564)
+++ transcode.c	(revision 19565)
@@ -2839,6 +2839,20 @@
     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;

--
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