* encoding.c (rb_enc_register): returns new index or -1 if failed.

* encoding.c (rb_enc_alias): check if original name is registered.

* encoding.c (rb_enc_init): register in same order as kcode options in
  re.c.  added new aliases.

* string.c (rb_str_force_encoding): check if valid encoding name.


git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@13643 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 1 deletions

diff --git a/string.c b/string.c
index 985c42778..d53476975 100644
--- a/string.c
+++ b/string.c
@@ -5114,8 +5114,17 @@ rb_str_setter(VALUE val, ID id, VALUE *var)
 static VALUE
 rb_str_force_encoding(VALUE str, VALUE encname)
 {
+    const char *name;
+    int idx;
+
+    if (NIL_P(encname)) {
+	idx = 0;
+    }
+    else if ((idx = rb_enc_find_index(name = StringValueCStr(encname))) < 0) {
+	rb_raise(rb_eArgError, "invalid encoding name - %s", name);
+    }
     str_modifiable(str);
-    rb_enc_associate(str, rb_enc_find(StringValueCStr(encname)));
+    rb_enc_associate_index(str, idx);
     return str;
 }