[ruby/stringio] An empty string should be converted to empty in any encoding

nobu · matzbot · commit 484ea00d2e1c · 2024-10-26T13:20:34.000Z
ruby/stringio@ef03f9368d
diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
@@ -961,6 +961,7 @@ strio_ungetc(VALUE self, VALUE c)
     }
     else {
 	StringValue(c);
+	if (RSTRING_LEN(c) == 0) return Qnil;
 	enc = rb_enc_get(ptr->string);
 	enc2 = rb_enc_get(c);
 	if (enc != enc2 && enc != rb_ascii8bit_encoding()) {

Original file line number	Diff line number	Diff line change
`@@ -961,6 +961,7 @@ strio_ungetc(VALUE self, VALUE c)`
`961`	`961`	`}`
`962`	`962`	`else {`
`963`	`963`	`StringValue(c);`
	`964`	`+ if (RSTRING_LEN(c) == 0) return Qnil;`
`964`	`965`	`enc = rb_enc_get(ptr->string);`
`965`	`966`	`enc2 = rb_enc_get(c);`
`966`	`967`	`if (enc != enc2 && enc != rb_ascii8bit_encoding()) {`