Simplify/fix debug lines truncation

program/lib/Roundcube/rcube_db.php

@@ -257,8 +257,9 @@ class rcube_db
     {
         if ($this->options['debug_mode']) {
             if (($len = strlen($query)) > self::DEBUG_LINE_LENGTH) {
-                $query = substr_replace($query, "\n-----[debug cut]-----\n",
-                    self::DEBUG_LINE_LENGTH/2 - 11, $len - self::DEBUG_LINE_LENGTH - 22);
+                $diff  = $len - self::DEBUG_LINE_LENGTH;
+                $query = substr($query, 0, self::DEBUG_LINE_LENGTH)
+                    . "... [truncated $diff bytes]";
             }
             rcube::write_log('sql', '[' . (++$this->db_index) . '] ' . $query . ';');
         }

program/lib/Roundcube/rcube_imap_generic.php

@@ -72,7 +72,7 @@ class rcube_imap_generic
     const COMMAND_CAPABILITY = 2;
     const COMMAND_LASTLINE   = 4;
 
-    const DEBUG_LINE_LENGTH = 4096;
+    const DEBUG_LINE_LENGTH = 4098; // 4KB + 2B for \r\n
 
     /**
      * Object constructor
@@ -3780,8 +3780,9 @@ class rcube_imap_generic
     private function debug($message)
     {
         if (($len = strlen($message)) > self::DEBUG_LINE_LENGTH) {
-            $message = substr_replace($message, "\n-----[debug cut]-----\n",
-                self::DEBUG_LINE_LENGTH/2 - 11, $len - self::DEBUG_LINE_LENGTH - 22);
+            $diff    = $len - self::DEBUG_LINE_LENGTH;
+            $message = substr($message, 0, self::DEBUG_LINE_LENGTH)
+                . "... [truncated $diff bytes]";
         }
 
         if ($this->resourceid) {

program/lib/Roundcube/rcube_smtp.php

@@ -33,7 +33,7 @@ class rcube_smtp
     // define headers delimiter
     const SMTP_MIME_CRLF = "\r\n";
 
-    const DEBUG_LINE_LENGTH = 4096;
+    const DEBUG_LINE_LENGTH = 4098; // 4KB + 2B for \r\n
 
 
     /**
@@ -330,8 +330,9 @@ class rcube_smtp
     public function debug_handler(&$smtp, $message)
     {
         if (($len = strlen($message)) > self::DEBUG_LINE_LENGTH) {
-            $message = substr_replace($message, "\n-----[debug cut]----\n",
-                self::DEBUG_LINE_LENGTH/2 - 11, $len - self::DEBUG_LINE_LENGTH - 22);
+            $diff    = $len - self::DEBUG_LINE_LENGTH;
+            $message = substr($message, 0, self::DEBUG_LINE_LENGTH)
+                . "... [truncated $diff bytes]";
         }
 
         rcube::write_log('smtp', preg_replace('/\r\n$/', '', $message));