From nobody Mon Feb 9 03:12:42 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1547131854113180.86563369216367; Thu, 10 Jan 2019 06:50:54 -0800 (PST) Received: from localhost ([127.0.0.1]:40571 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghbfY-0002eA-Hi for importer@patchew.org; Thu, 10 Jan 2019 09:50:52 -0500 Received: from eggs.gnu.org ([209.51.188.92]:36010) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ghbLv-0004Ge-Rk for qemu-devel@nongnu.org; Thu, 10 Jan 2019 09:30:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ghbLu-00061D-Nx for qemu-devel@nongnu.org; Thu, 10 Jan 2019 09:30:35 -0500 Received: from mx1.redhat.com ([209.132.183.28]:41130) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ghbLu-0005zi-ET for qemu-devel@nongnu.org; Thu, 10 Jan 2019 09:30:34 -0500 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id DB964420A5; Thu, 10 Jan 2019 14:30:32 +0000 (UTC) Received: from localhost (ovpn-116-5.gru2.redhat.com [10.97.116.5]) by smtp.corp.redhat.com (Postfix) with ESMTP id 58E115D75C; Thu, 10 Jan 2019 14:30:07 +0000 (UTC) From: Eduardo Habkost To: Peter Maydell , qemu-devel@nongnu.org Date: Thu, 10 Jan 2019 12:29:49 -0200 Message-Id: <20190110142955.23254-5-ehabkost@redhat.com> In-Reply-To: <20190110142955.23254-1-ehabkost@redhat.com> References: <20190110142955.23254-1-ehabkost@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Thu, 10 Jan 2019 14:30:32 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 04/10] range: add some more functions X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Hildenbrand Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Hildenbrand Add some more functions that will be used in memory-device context. range_init(): Init using lower bound and size, check for validity range_init_nofail(): Init using lower bound and size, validity asserted range_size(): Extract the size of a range range_overlaps_range(): Check for overlaps of two ranges range_contains_range(): Check if one range is contained in the other Reviewed-by: Igor Mammedov Signed-off-by: David Hildenbrand Message-Id: <20181214131043.25071-2-david@redhat.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Eduardo Habkost --- include/qemu/range.h | 62 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/include/qemu/range.h b/include/qemu/range.h index 7e75f4e655..ba606c6bc0 100644 --- a/include/qemu/range.h +++ b/include/qemu/range.h @@ -112,6 +112,68 @@ static inline uint64_t range_upb(Range *range) return range->upb; } =20 +/* + * Initialize @range to span the interval [@lob,@lob + @size - 1]. + * @size may be 0. If the range would overflow, returns -ERANGE, otherwise + * 0. + */ +static inline int QEMU_WARN_UNUSED_RESULT range_init(Range *range, uint64_= t lob, + uint64_t size) +{ + if (lob + size < lob) { + return -ERANGE; + } + range->lob =3D lob; + range->upb =3D lob + size - 1; + range_invariant(range); + return 0; +} + +/* + * Initialize @range to span the interval [@lob,@lob + @size - 1]. + * @size may be 0. Range must not overflow. + */ +static inline void range_init_nofail(Range *range, uint64_t lob, uint64_t = size) +{ + range->lob =3D lob; + range->upb =3D lob + size - 1; + range_invariant(range); +} + +/* + * Get the size of @range. + */ +static inline uint64_t range_size(const Range *range) +{ + return range->upb - range->lob + 1; +} + +/* + * Check if @range1 overlaps with @range2. If one of the ranges is empty, + * the result is always "false". + */ +static inline bool range_overlaps_range(const Range *range1, + const Range *range2) +{ + if (range_is_empty(range1) || range_is_empty(range2)) { + return false; + } + return !(range2->upb < range1->lob || range1->upb < range2->lob); +} + +/* + * Check if @range1 contains @range2. If one of the ranges is empty, + * the result is always "false". + */ +static inline bool range_contains_range(const Range *range1, + const Range *range2) +{ + if (range_is_empty(range1) || range_is_empty(range2)) { + return false; + } + return range1->lob <=3D range2->lob && range1->upb >=3D range2->upb; +} + /* * Extend @range to the smallest interval that includes @extend_by, too. */ --=20 2.18.0.rc1.1.g3f1ff2140