1 files changed, 39 insertions, 36 deletions

diff --git a/io.c b/io.c
index 9d75c230f4..9306b81d18 100644
--- a/io.c
+++ b/io.c
@@ -10573,54 +10573,57 @@ copy_stream_body(VALUE arg)
 
     stp->total = 0;
 
-    if (src_io == argf) {
-	src_fd = -1;
-    }
-    else if (RB_TYPE_P(src_io, T_FILE)) {
-	goto io_src;
-    }
-    else if (!RB_TYPE_P(src_io, T_STRING) &&
-	     (rb_respond_to(src_io, id_read) ||
-	      rb_respond_to(src_io, id_readpartial))) {
+    if (src_io == argf ||
+	!(RB_TYPE_P(src_io, T_FILE) ||
+	  RB_TYPE_P(src_io, T_STRING) ||
+	  rb_respond_to(src_io, rb_intern("to_path")))) {
 	src_fd = -1;
     }
     else {
-	VALUE args[2];
-	FilePathValue(src_io);
-	args[0] = src_io;
-	args[1] = INT2NUM(O_RDONLY|common_oflags);
-	src_io = rb_class_new_instance(2, args, rb_cFile);
-	stp->src = src_io;
-	stp->close_src = 1;
-      io_src:
+	VALUE tmp_io = rb_io_check_io(src_io);
+	if (!NIL_P(tmp_io)) {
+	    src_io = tmp_io;
+	}
+	else if (!RB_TYPE_P(src_io, T_FILE)) {
+	    VALUE args[2];
+	    FilePathValue(src_io);
+	    args[0] = src_io;
+	    args[1] = INT2NUM(O_RDONLY|common_oflags);
+	    src_io = rb_class_new_instance(2, args, rb_cFile);
+	    stp->src = src_io;
+	    stp->close_src = 1;
+	}
 	GetOpenFile(src_io, src_fptr);
 	rb_io_check_byte_readable(src_fptr);
 	src_fd = src_fptr->fd;
     }
     stp->src_fd = src_fd;
 
-    if (dst_io == argf) {
-	dst_fd = -1;
-    }
-    else if (RB_TYPE_P(dst_io, T_FILE)) {
-	dst_io = GetWriteIO(dst_io);
-	stp->dst = dst_io;
-	goto io_dst;
-    }
-    else if (!RB_TYPE_P(dst_io, T_STRING) &&
-	     rb_respond_to(dst_io, id_write)) {
+    if (dst_io == argf ||
+	!(RB_TYPE_P(dst_io, T_FILE) ||
+	  RB_TYPE_P(dst_io, T_STRING) ||
+	  rb_respond_to(dst_io, rb_intern("to_path")))) {
 	dst_fd = -1;
     }
     else {
-	VALUE args[3];
-	FilePathValue(dst_io);
-	args[0] = dst_io;
-	args[1] = INT2NUM(O_WRONLY|O_CREAT|O_TRUNC|common_oflags);
-	args[2] = INT2FIX(0666);
-	dst_io = rb_class_new_instance(3, args, rb_cFile);
-	stp->dst = dst_io;
-	stp->close_dst = 1;
-      io_dst:
+	VALUE tmp_io = rb_io_check_io(dst_io);
+	if (!NIL_P(tmp_io)) {
+	    dst_io = tmp_io;
+	}
+	else if (!RB_TYPE_P(dst_io, T_FILE)) {
+	    VALUE args[3];
+	    FilePathValue(dst_io);
+	    args[0] = dst_io;
+	    args[1] = INT2NUM(O_WRONLY|O_CREAT|O_TRUNC|common_oflags);
+	    args[2] = INT2FIX(0666);
+	    dst_io = rb_class_new_instance(3, args, rb_cFile);
+	    stp->dst = dst_io;
+	    stp->close_dst = 1;
+	}
+	else {
+	    dst_io = GetWriteIO(dst_io);
+	    stp->dst = dst_io;
+	}
 	GetOpenFile(dst_io, dst_fptr);
 	rb_io_check_writable(dst_fptr);
 	dst_fd = dst_fptr->fd;