Fix C++ Mode dynamic error with string delimiters.

Fixes bug #33163

* lisp/progmodes/cc-mode.el (c-before-change-check-unbalanced-strings):
Use the correct variable `end' in place of the wrong `c-new-END'.
(c-after-change-re-mark-unbalanced-strings): Correct a logic error whilst
skipping over comments.

1 files changed, 12 insertions, 12 deletions

diff --git a/lisp/progmodes/cc-mode.el b/lisp/progmodes/cc-mode.el
index 09c30e2bd1b..d019cf24937 100644
--- a/lisp/progmodes/cc-mode.el
+++ b/lisp/progmodes/cc-mode.el
@@ -1232,21 +1232,21 @@ Note that the style variables are always made local to the buffer."
       (if (eq beg-literal-type 'string)
           (setq c-new-BEG (min (car beg-limits) c-new-BEG))))
 
-     ((< c-new-END (point-max))
-      (goto-char (1+ c-new-END))        ; might be a newline.
+     ((< end (point-max))
+      (goto-char (1+ end))      ; might be a newline.
       ;; In the following regexp, the initial \n caters for a newline getting
       ;; joined to a preceding \ by the removal of what comes between.
       (re-search-forward "[\n\r]?\\(\\\\\\(.\\|\n\\|\r\\)\\|[^\\\n\r]\\)*"
                          nil t)
       ;; We're at an EOLL or point-max.
-      (setq c-new-END (min (1+ (point)) (point-max)))
-      (goto-char c-new-END)
-      (if (equal (c-get-char-property (1- (point)) 'syntax-table) '(15))
-          (if (memq (char-before) '(?\n ?\r))
+      (setq c-new-END (max c-new-END (min (1+ (point)) (point-max))))
+      (if (equal (c-get-char-property (point) 'syntax-table) '(15))
+          (if (memq (char-after) '(?\n ?\r))
               ;; Normally terminated invalid string.
-              (progn
+              (let ((eoll-1 (point)))
+                (forward-char)
                 (backward-sexp)
-                (c-clear-char-property (1- c-new-END) 'syntax-table)
+                (c-clear-char-property eoll-1 'syntax-table)
                 (c-clear-char-property (point) 'syntax-table))
             ;; Opening " at EOB.
             (c-clear-char-property (1- (point)) 'syntax-table))
@@ -1254,7 +1254,7 @@ Note that the style variables are always made local to the buffer."
             ;; Opening " on last line of text (without EOL).
             (c-clear-char-property (point) 'syntax-table))))
 
-     (t (goto-char c-new-END)
+     (t (goto-char end)                 ; point-max
         (if (c-search-backward-char-property 'syntax-table '(15) c-new-BEG)
             (c-clear-char-property (point) 'syntax-table))))
 
@@ -1343,9 +1343,9 @@ Note that the style variables are always made local to the buffer."
              (while (progn
                       (setq s (parse-partial-sexp (point) c-new-END nil
                                                   nil s 'syntax-table))
-                      (and (not (nth 3 s))
-                           (< (point) c-new-END)
-                           (not (memq (char-before) c-string-delims)))))
+                      (and (< (point) c-new-END)
+                           (or (not (nth 3 s))
+                               (not (memq (char-before) c-string-delims))))))
              ;; We're at the start of a string.
              (memq (char-before) c-string-delims)))
         (if (c-unescaped-nls-in-string-p (1- (point)))