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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E7E27C433EF for ; Wed, 17 Nov 2021 02:10:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C9B3361507 for ; Wed, 17 Nov 2021 02:10:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232132AbhKQCNo (ORCPT ); Tue, 16 Nov 2021 21:13:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58504 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229957AbhKQCNm (ORCPT ); Tue, 16 Nov 2021 21:13:42 -0500 Received: from mail-qt1-x82e.google.com (mail-qt1-x82e.google.com [IPv6:2607:f8b0:4864:20::82e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4A8C9C061570 for ; Tue, 16 Nov 2021 18:10:45 -0800 (PST) Received: by mail-qt1-x82e.google.com with SMTP id f20so1201150qtb.4 for ; Tue, 16 Nov 2021 18:10:45 -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=4HWtsI5h2DEUWL+/lY1qwckXPr6zw+S8gYQnckmOSfg=; b=GQGyOBytSpXaz0TdzbgV7uDUMPRQZXFhkSn0J297/wmUHv9gUANZWP2WMDKQ2dfuoe iUHhwDzszUevrdz3NJeJa3+3Wiu+1JU/KT28zfL8IcbM7cl1eyX5AGC6yurtO2EUZSzP +fHNCTIA2eq5eYGW0oEdehRfUrg7yZpay+g4WNULU8x6n32zVz3MK11XxJN6b8GJyWQ1 w3mOVoS4LmBR+yByerD5ujj5pQj74dkASja+hI67/oPdC7yYP4i5Qp9Bq4U4N7lDpmMS Y9AV720AuqTNS50f4N8bJUoHVU59YmqSZnS+0Qbzrd44CapPU98jYxEfJi9nCX+KNASB 4P8w== 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=4HWtsI5h2DEUWL+/lY1qwckXPr6zw+S8gYQnckmOSfg=; b=5kpnmNUoxwPfjOuyTD3mPytz4t11MCgJjog+pqmsCw8txBE5R/yx38kPnKCHC6jhvW jkDBkXFfDRinfKJ4GA27h5kC63RuNWDCzXk9XqL8jKRGTrLXPeJ7eVyVeEifNjqQJLsd TYPJfhZD7I0TmGOKydEnh05UPrOTrPehH3BtObDPAebv0nMlR8Y+H4TEYpfP2dLB2qAz O1MZm2stDu7kIk6pnyyD2Rlxpuy0+GR4I9yRn1eUAeeyqQmNYrPfV7yv70ujaFhAdKAB Y5nR0PB+7p6g+2s4I7JSpQNLb42DWfNba6Xrwce5UalRrsuAic/Fy0z3DWxqG8+mM79h Ryfw== X-Gm-Message-State: AOAM533hSsn/BjoQgqi/0x0wv2OMPJ3nKdlKcygMUIdMP/8+hBJz7zsP z6vEVb19YrEcleEUYZuSwv2xS2fSt+E= X-Google-Smtp-Source: ABdhPJwMcp7cCbrCOIz4GcAyimeYRL3jkBMsASI3XAxuPZ77ubzVFw3JL+W2VKrQEHNSA1dT8uC77Q== X-Received: by 2002:a05:622a:1102:: with SMTP id e2mr11421530qty.194.1637115044382; Tue, 16 Nov 2021 18:10:44 -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 t11sm9326200qkm.96.2021.11.16.18.10.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Nov 2021 18:10:43 -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 1/5] include/c: Add abs_diff macro Date: Tue, 16 Nov 2021 21:10:34 -0500 Message-Id: <20211117021038.823851-2-seanga2@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211117021038.823851-1-seanga2@gmail.com> References: <20211117021038.823851-1-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 --- 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