Upgrade to length* functions in Tramp

* lisp/net/tramp-compat.el (tramp-compat-replace-regexp-in-region):
Move up.
(tramp-compat-length<, tramp-compat-length>)
(tramp-compat-length=): New defaliases.
(tramp-compat-file-name-unquote, tramp-compat-take)
(tramp-compat-ntake): Use them.

* lisp/net/tramp.el (tramp-string-empty-or-nil-p): New defsubst.
(tramp-find-host, tramp-buffer-name, tramp-make-tramp-file-name)
(tramp-completion-make-tramp-file-name, tramp-debug-buffer-name)
(tramp-completion-handle-file-name-all-completions)
(tramp-handle-directory-file-name)
(tramp-handle-expand-file-name)
(tramp-handle-file-name-as-directory)
(tramp-handle-file-name-completion)
(tramp-direct-async-process-p, tramp-call-process)
(tramp-read-passwd):
* lisp/net/tramp-adb.el (tramp-adb-get-device)
(tramp-adb-execute-adb-command, tramp-adb-maybe-open-connection):
* lisp/net/tramp-archive.el (tramp-archive-handle-directory-file-name):
* lisp/net/tramp-gvfs.el (tramp-gvfs-handle-expand-file-name)
(tramp-gvfs-monitor-process-filter)
(tramp-gvfs-handle-get-home-directory)
(tramp-gvfs-handler-askpassword)
(tramp-gvfs-maybe-open-connection, tramp-get-media-devices):
* lisp/net/tramp-rclone.el (tramp-rclone-maybe-open-connection):
* lisp/net/tramp-sh.el (tramp-sh-handle-file-directory-p)
(tramp-sh-handle-insert-directory)
(tramp-sh-handle-expand-file-name, tramp-sh-handle-make-process)
(tramp-sh-gio-monitor-process-filter, tramp-set-remote-path)
(tramp-open-connection-setup-interactive-shell)
(tramp-maybe-open-connection, tramp-make-copy-program-file-name):
* lisp/net/tramp-smb.el (tramp-smb-handle-copy-directory)
(tramp-smb-handle-expand-file-name, tramp-smb-handle-file-acl)
(tramp-smb-handle-insert-directory)
(tramp-smb-handle-set-file-acl)
(tramp-smb-handle-get-home-directory)
(tramp-smb-maybe-open-connection):
* lisp/net/tramp-sudoedit.el (tramp-sudoedit-handle-expand-file-name)
(tramp-sudoedit-handle-file-name-all-completions): Use the new
functions.

* test/lisp/net/tramp-archive-tests.el
(tramp-archive-test43-file-system-info):
* test/lisp/net/tramp-tests.el (tramp-test26-file-name-completion)
(tramp-test31-memory-info, tramp-test35-remote-path)
(tramp-test43-file-system-info): Use new compat functions.

test/lisp/net/tramp-archive-tests.el

@@ -872,7 +872,7 @@ This tests also `file-executable-p', `file-writable-p' and `set-file-modes'."
   (let ((fsi (file-system-info tramp-archive-test-archive)))
     (skip-unless fsi)
     (should (and (consp fsi)
-		 (= (length fsi) 3)
+		 (tramp-compat-length= fsi 3)
 		 (numberp (nth 0 fsi))
 		 ;; FREE and AVAIL are always 0.
 		 (zerop (nth 1 fsi))

test/lisp/net/tramp-tests.el

@@ -4516,17 +4516,17 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
 		  (and (string-match-p tramp-ipv6-regexp host)
 		       tramp-postfix-ipv6-format)))
               ;; Complete method name.
-	      (unless (or (zerop (length method))
-                          (zerop (length tramp-method-regexp)))
+	      (unless (or (tramp-string-empty-or-nil-p method)
+                          (string-empty-p tramp-method-regexp))
 	        (should
 	         (member
 		  (concat prefix-format method tramp-postfix-method-format)
 		  (file-name-all-completions
                    (concat prefix-format (substring method 0 1)) "/"))))
               ;; Complete host name.
-	      (unless (or (zerop (length method))
-                          (zerop (length tramp-method-regexp))
-                          (zerop (length host))
+	      (unless (or (tramp-string-empty-or-nil-p method)
+                          (string-empty-p tramp-method-regexp)
+                          (tramp-string-empty-or-nil-p host)
 			  (tramp--test-gvfs-p method))
 	        (should
 	         (member
@@ -5370,7 +5370,7 @@ If UNSTABLE is non-nil, the test is tagged as `:unstable'."
   (when-let ((default-directory ert-remote-temporary-file-directory)
              (mi (memory-info)))
     (should (consp mi))
-    (should (= (length mi) 4))
+    (should (tramp-compat-length= mi 4))
     (dotimes (i (length mi))
       (should (natnump (nth i mi))))))
 
@@ -5915,7 +5915,8 @@ INPUT, if non-nil, is a string sent to the process."
           ;; We make a super long `tramp-remote-path'.
           (make-directory tmp-name)
           (should (file-directory-p tmp-name))
-          (while (< (length (mapconcat #'identity orig-exec-path ":")) 5000)
+          (while (tramp-compat-length<
+		  (mapconcat #'identity orig-exec-path ":") 5000)
             (let ((dir (make-temp-file (file-name-as-directory tmp-name) 'dir)))
               (should (file-directory-p dir))
               (setq tramp-remote-path
@@ -5931,9 +5932,10 @@ INPUT, if non-nil, is a string sent to the process."
           ;; Ignore trailing newline.
 	  (setq path (substring (shell-command-to-string "echo $PATH") nil -1))
 	  ;; The shell doesn't handle such long strings.
-	  (when (<= (length path)
-		    (tramp-get-connection-property
-		     tramp-test-vec "pipe-buf" 4096))
+	  (unless (tramp-compat-length>
+		   path
+		   (tramp-get-connection-property
+		    tramp-test-vec "pipe-buf" 4096))
 	    ;; The last element of `exec-path' is `exec-directory'.
             (should
 	     (string-equal
@@ -7070,7 +7072,7 @@ This requires restrictions of file name syntax."
 
   (when-let ((fsi (file-system-info ert-remote-temporary-file-directory)))
     (should (consp fsi))
-    (should (= (length fsi) 3))
+    (should (tramp-compat-length= fsi 3))
     (dotimes (i (length fsi))
       (should (natnump (or (nth i fsi) 0))))))