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From 9024078c32dd74ba0e376d422cba33f587f7756d Mon Sep 17 00:00:00 2001
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From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
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Date: Sun, 10 Mar 2013 19:19:21 +0100
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Subject: [PATCH 205/482] * include/grub/datetime.h
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(grub_datetime2unixtime): Fix unixtime computation for some years
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before epoch. Avode confusing division while on it.
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---
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ChangeLog | 6 ++++++
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include/grub/datetime.h | 4 +---
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2 files changed, 7 insertions(+), 3 deletions(-)
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diff --git a/ChangeLog b/ChangeLog
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index 48ca30e..8814c22 100644
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--- a/ChangeLog
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+++ b/ChangeLog
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@@ -1,5 +1,11 @@
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2013-03-10 Vladimir Serbinenko <phcoder@gmail.com>
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+ * include/grub/datetime.h (grub_datetime2unixtime): Fix unixtime
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+ computation for some years before epoch. Avode confusing division
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+ while on it.
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+
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+2013-03-10 Vladimir Serbinenko <phcoder@gmail.com>
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+
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* grub-core/video/i386/pc/vbe.c
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(grub_video_vbe_print_adapter_specific_info): Replace division by
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shifts.
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diff --git a/include/grub/datetime.h b/include/grub/datetime.h
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index 3a3b3d0..fef2814 100644
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--- a/include/grub/datetime.h
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+++ b/include/grub/datetime.h
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@@ -89,9 +89,7 @@ grub_datetime2unixtime (const struct grub_datetime *datetime, grub_int32_t *nix)
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ret = 3 * SECPERYEAR + SECPERDAY;
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/* Transform C divisions and modulos to mathematical ones */
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- y4 = (datetime->year - 1973) / 4;
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- if (datetime->year < 1973)
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- y4--;
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+ y4 = ((datetime->year - 1) >> 2) - (1973 / 4);
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ay = datetime->year - 1973 - 4 * y4;
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ret += y4 * SECPER4YEARS;
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ret += ay * SECPERYEAR;
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--
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1.8.2.1
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