From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D91EC433EF for ; Mon, 21 Mar 2022 17:33:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349212AbiCURfN (ORCPT ); Mon, 21 Mar 2022 13:35:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34854 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348662AbiCURe5 (ORCPT ); Mon, 21 Mar 2022 13:34:57 -0400 Received: from 1wt.eu (wtarreau.pck.nerim.net [62.212.114.60]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id C17FD6623B for ; Mon, 21 Mar 2022 10:33:30 -0700 (PDT) Received: (from willy@localhost) by pcw.home.local (8.15.2/8.15.2/Submit) id 22LHXNTJ007570; Mon, 21 Mar 2022 18:33:23 +0100 From: Willy Tarreau To: "Paul E . McKenney" Cc: linux-kernel@vger.kernel.org, Ammar Faizi Subject: [PATCH 1/8] tools/nolibc/stdio: make printf(%s) accept NULL Date: Mon, 21 Mar 2022 18:33:07 +0100 Message-Id: <20220321173314.7519-2-w@1wt.eu> X-Mailer: git-send-email 2.17.5 In-Reply-To: <20220321173314.7519-1-w@1wt.eu> References: <20220321173314.7519-1-w@1wt.eu> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It's often convenient to support this, especially in test programs where a NULL may correspond to an allocation error or a non-existing value. Let's make printf("%s") support being passed a NULL. In this case it prints "(null)" like glibc's printf(). Signed-off-by: Willy Tarreau --- tools/include/nolibc/stdio.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h index cb4d3ab3a565..559ebe052a75 100644 --- a/tools/include/nolibc/stdio.h +++ b/tools/include/nolibc/stdio.h @@ -220,6 +220,8 @@ int vfprintf(FILE *stream, const char *fmt, va_list args) } else if (c == 's') { outstr = va_arg(args, char *); + if (!outstr) + outstr="(null)"; } else if (c == '%') { /* queue it verbatim */ -- 2.35.1