GNU bug report logs - #42869
[PATCH] Fix url-expand-file-name when applied to file:/// URLs

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From: Steven Allen <steven <at> stebalien.com>
To: 42869 <at> debbugs.gnu.org
Subject: bug#42869: [PATCH] Fix url-expand-file-name when applied to file:/// URLs
Date: Fri, 14 Aug 2020 13:37:51 -0700

This code is supposed to update the portspec slot in the url object,
but was attempting to setf whatever url-port happened to return (not
necessarily the portspec slot).

* lisp/url/url-expand.el (url-default-expander): Set `url-portspec'.
---
 lisp/url/url-expand.el            | 2 +-
 test/lisp/url/url-expand-tests.el | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/lisp/url/url-expand.el b/lisp/url/url-expand.el
index f34ef810c4a..be9b5426dc4 100644
--- a/lisp/url/url-expand.el
+++ b/lisp/url/url-expand.el
@@ -120,7 +120,7 @@ url-default-expander
       ;; Well, they told us the scheme, let's just go with it.
       nil
     (setf (url-type urlobj) (or (url-type urlobj) (url-type defobj)))
-    (setf (url-port urlobj) (or (url-portspec urlobj)
+    (setf (url-portspec urlobj) (or (url-portspec urlobj)
                                 (and (string= (url-type urlobj)
                                               (url-type defobj))
 				     (url-port defobj))))
diff --git a/test/lisp/url/url-expand-tests.el b/test/lisp/url/url-expand-tests.el
index 6e0ce869502..3b0b6fbd41a 100644
--- a/test/lisp/url/url-expand-tests.el
+++ b/test/lisp/url/url-expand-tests.el
@@ -100,6 +100,13 @@ url-expand-file-name/relative-resolution-additional-examples
   (should (equal (url-expand-file-name "foo#bar" "http://host/foobar") "http://host/foo#bar"))
   (should (equal (url-expand-file-name "foo#bar" "http://host/foobar/") "http://host/foobar/foo#bar")))
 
+(ert-deftest url-expand-file-name/relative-resolution-file-url ()
+  "RFC 3986, Section 5.4 Reference Resolution Examples / Section 5.4.1. Normal Examples"
+  (should (equal (url-expand-file-name "bar.html"          "file:///a/b/c/foo.html") "file:///a/b/c/bar.html"))
+  (should (equal (url-expand-file-name "bar.html"          "file:///a/b/c/")         "file:///a/b/c/bar.html"))
+  (should (equal (url-expand-file-name "../d/bar.html"     "file:///a/b/c/")         "file:///a/b/d/bar.html"))
+  (should (equal (url-expand-file-name "../d/bar.html"     "file:///a/b/c/foo.html") "file:///a/b/d/bar.html")))
+
 (provide 'url-expand-tests)
 
 ;;; url-expand-tests.el ends here
-- 
2.28.0

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