fix numeric overflow

changes.txt

@@ -1,5 +1,6 @@
 Changes from 5.13 to 5.14
 =========================
+- BUGFIX(h323utils.cxx) fix numeric overflow
 - BUGFIX(Toolkit.cxx) fix iterator usage (found by Coverity)
 
 Changes from 5.12 to 5.13

h323util.cxx

@@ -2,7 +2,7 @@
 //
 // H.323 utility functions
 //
-// Copyright (c) 2000-2023, Jan Willamowius
+// Copyright (c) 2000-2024, Jan Willamowius
 //
 // This work is published under the GNU Public License version 2 (GPLv2)
 // see file COPYING for details.
@@ -958,8 +958,8 @@ PString RewriteString(
 			PTRACE(1, "GK\tInvalid rewrite rule (dots do not match) - " << prefix << " = " << value);
 			break;
 		}
-		int dotDstOffset = (long)lastDstDot - (long)value;
-		int dotSrcOffset = (long)lastSrcDot - (long)prefix;
+		int dotDstOffset = long(lastDstDot - value);
+		int dotSrcOffset = long(lastSrcDot - prefix);
 		while (*lastDstDot++ == '.' && *lastSrcDot++ == '.') {
 			if (postdialmatch) {
 				postdialdigits += s[dotSrcOffset++];

version.h

@@ -3,7 +3,7 @@
 // Version number for GnuGk
 //
 // Copyright (c) 2002, Dr.-Ing. Martin Froehlich <[email protected]>
-// Copyright (c) 2006-2023, Jan Willamowius
+// Copyright (c) 2006-2024, Jan Willamowius
 //
 // This work is published under the GNU Public License version 2 (GPLv2)
 // see file COPYING for details.