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 3C08AC433F5 for ; Wed, 24 Nov 2021 18:26:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236629AbhKXS3m (ORCPT ); Wed, 24 Nov 2021 13:29:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231941AbhKXS3m (ORCPT ); Wed, 24 Nov 2021 13:29:42 -0500 Received: from mail-qt1-x834.google.com (mail-qt1-x834.google.com [IPv6:2607:f8b0:4864:20::834]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2FCCDC061574 for ; Wed, 24 Nov 2021 10:26:32 -0800 (PST) Received: by mail-qt1-x834.google.com with SMTP id t34so3592787qtc.7 for ; Wed, 24 Nov 2021 10:26:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Eg12aE0nc6JQPV5omf/DDBaxxes7OlML7ESljWL0Pfk=; b=QpLu0UqGfZCrLXB6iEU3D7p5l1tKLVRv5FXKPx/7oE2P2OLEdW3sSJ4jINVjt5xKTo xU9xRC2tYhqsmUUIbXqWTzOARzE+5gZ4ROKzoC8cDR1U8TD/AfaWoGAMryfv0PX7erIS ddokF3FWrobwdC0s6G8e2KO1IvhzM2Ve8a8LCvLT1Lc1Td+eKoOjsapThI8j5ZM8g+DY WyFaA7BHTegaUM+bW8KEz4hOFZkdMb9l6FLYN8ttfiZY3d0MzL38sVJn/4XJGnWynNCt y+Xz4vp6/h68XejxXk0B50dTNoLCunumL5H40JTajC0eNSsMEkO4SWL/WPDytN+AaSZ/ 5UfQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Eg12aE0nc6JQPV5omf/DDBaxxes7OlML7ESljWL0Pfk=; b=PxGrtW9gXspLV1FdDv7YEOwlxE+728xmtXRblT/Uip8KDDMsnh5p1A7OIyN3ydRJfQ qM0SavgKApRhrdvHc8aNitc/BCgOkW/fJFMaJlnK5g5ZOZ87APLM6pbIQRWAsRlLB182 Tmjp1P5YMdvTFtjkOMnpQ7CPWSY7wHM0P6pcy6sNGC3Lc5jNMuykva/n8RhzDuJR59ff milmzTwhdmL6/oJGgfsLWtTyIHHOXMsHekd65WKDZBKn72syNIZ9y/z9ReosPbUPULZh M+NjVferUur1CNmMK/iAsopvkzw/nRt3hFcS5405tRD9dKa7igRp261kQot6JneuTyaM +THA== X-Gm-Message-State: AOAM530bN8MnyfRAeJV/xfSQXgOai4SUhjinRl1sd0sfgSKoAa4C46le 1a5CnxebtrcLLH9dM/4y64OkpK46jWk= X-Google-Smtp-Source: ABdhPJzrQVi3On50eIqhsT44OFTaQClrQXvSuY7SpCCqkMhS6tsXpy5XtR5vQvIjZaYvQi4Ei2/6EA== X-Received: by 2002:ac8:7f86:: with SMTP id z6mr10083251qtj.162.1637778391251; Wed, 24 Nov 2021 10:26:31 -0800 (PST) Received: from godwin.fios-router.home (pool-108-18-207-184.washdc.fios.verizon.net. [108.18.207.184]) by smtp.gmail.com with ESMTPSA id h19sm274936qth.63.2021.11.24.10.26.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Nov 2021 10:26:30 -0800 (PST) From: Sean Anderson To: util-linux@vger.kernel.org, Karel Zak Cc: Mikhail Gusarov , Matthew Harm Bekkema , James Peach , Sean Anderson Subject: [PATCH v2 1/6] include/c: Add abs_diff macro Date: Wed, 24 Nov 2021 13:26:13 -0500 Message-Id: <20211124182618.1801447-2-seanga2@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211124182618.1801447-1-seanga2@gmail.com> References: <20211124182618.1801447-1-seanga2@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: util-linux@vger.kernel.org This macro calculates abs(a - b). It is especially useful for unsigned numbers. Signed-off-by: Sean Anderson --- (no changes since v1) include/c.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/c.h b/include/c.h index 354b59e29..ba799d8fd 100644 --- a/include/c.h +++ b/include/c.h @@ -159,6 +159,14 @@ _max1 > _max2 ? _max1 : _max2; }) #endif +#ifndef abs_diff +# define abs_diff(x, y) __extension__ ({ \ + __typeof__(x) _a = (x); \ + __typeof__(y) _b = (y); \ + (void) (&_a == &_b); \ + _a > _b ? _a - _b : _b - _a; }) +#endif + #ifndef cmp_numbers # define cmp_numbers(x, y) __extension__ ({ \ __typeof__(x) _a = (x); \ -- 2.33.0