patch 8.2.3694: cannot use quotes in the count of an Ex command

Problem:    Cannot use quotes in the count of an Ex command.
Solution:   Add getdigits_quoted().  Give an error when misplacing a quote in
            a range. (closes #9240)

src/charset.c

@@ -1748,7 +1748,7 @@ skiptowhite_esc(char_u *p)
 }
 
 /*
- * Getdigits: Get a number from a string and skip over it.
+ * Get a number from a string and skip over it.
  * Note: the argument is a pointer to a char_u pointer!
  */
     long
@@ -1766,6 +1766,38 @@ getdigits(char_u **pp)
     return retval;
 }
 
+/*
+ * Like getdigits() but allow for embedded single quotes.
+ */
+    long
+getdigits_quoted(char_u **pp)
+{
+    char_u	*p = *pp;
+    long	retval = 0;
+
+    if (*p == '-')
+	++p;
+    while (VIM_ISDIGIT(*p))
+    {
+	if (retval >= LONG_MAX / 10 - 10)
+	    retval = LONG_MAX;
+	else
+	    retval = retval * 10 - '0' + *p;
+	++p;
+	if (in_vim9script() && *p == '\'' && VIM_ISDIGIT(p[1]))
+	    ++p;
+    }
+    if (**pp == '-')
+    {
+	if (retval == LONG_MAX)
+	    retval = LONG_MIN;
+	else
+	    retval = -retval;
+    }
+    *pp = p;
+    return retval;
+}
+
 /*
  * Return TRUE if "lbuf" is empty or only contains blanks.
  */