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From 5b9d5a4f0e351dc73b31507b56334f7ef692f20c Mon Sep 17 00:00:00 2001
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Message-Id: <5b9d5a4f0e351dc73b31507b56334f7ef692f20c.1387298827.git.minovotn@redhat.com>
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In-Reply-To: <3ed0fb61a3dc912ef036d7ef450bed192090709e.1387298827.git.minovotn@redhat.com>
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References: <3ed0fb61a3dc912ef036d7ef450bed192090709e.1387298827.git.minovotn@redhat.com>
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From: "Michael S. Tsirkin" <mst@redhat.com>
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Date: Tue, 17 Dec 2013 15:16:55 +0100
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Subject: [PATCH 03/56] range: add min/max operations on ranges
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RH-Author: Michael S. Tsirkin <mst@redhat.com>
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Message-id: <1387293161-4085-4-git-send-email-mst@redhat.com>
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Patchwork-id: 56308
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O-Subject: [PATCH qemu-kvm RHEL7.0 v2 03/57] range: add min/max operations on ranges
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Bugzilla: 1034876
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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RH-Acked-by: Marcel Apfelbaum <marcel.a@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit c5a22c4344f17169bb20e122e9d935c62aedc063)
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---
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include/qemu/range.h | 18 ++++++++++++++++++
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1 file changed, 18 insertions(+)
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Signed-off-by: Michal Novotny <minovotn@redhat.com>
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---
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include/qemu/range.h | 18 ++++++++++++++++++
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1 file changed, 18 insertions(+)
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diff --git a/include/qemu/range.h b/include/qemu/range.h
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index 4a0780d..aae9720 100644
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--- a/include/qemu/range.h
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+++ b/include/qemu/range.h
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@@ -17,6 +17,24 @@ struct Range {
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uint64_t end; /* 1 + the last byte. 0 if range empty or ends at ~0x0LL. */
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};
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+static inline void range_extend(Range *range, Range *extend_by)
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+{
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+ if (!extend_by->begin && !extend_by->end) {
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+ return;
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+ }
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+ if (!range->begin && !range->end) {
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+ *range = *extend_by;
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+ return;
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+ }
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+ if (range->begin > extend_by->begin) {
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+ range->begin = extend_by->begin;
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+ }
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+ /* Compare last byte in case region ends at ~0x0LL */
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+ if (range->end - 1 < extend_by->end - 1) {
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+ range->end = extend_by->end;
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+ }
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+}
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+
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/* Get last byte of a range from offset + length.
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* Undefined for ranges that wrap around 0. */
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static inline uint64_t range_get_last(uint64_t offset, uint64_t len)
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--
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1.7.11.7
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