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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
	while on it.
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Vladimir 'phcoder' Serbinenko 2013-03-10 19:19:21 +01:00
parent 21344ef620
commit 84cfe81b1d
2 changed files with 7 additions and 3 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2013-03-10 Vladimir Serbinenko <phcoder@gmail.com>
* include/grub/datetime.h (grub_datetime2unixtime): Fix unixtime
computation for some years before epoch. Avode confusing division
while on it.
2013-03-10 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/video/i386/pc/vbe.c

4
include/grub/datetime.h
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@ -89,9 +89,7 @@ grub_datetime2unixtime (const struct grub_datetime *datetime, grub_int32_t *nix)
ret = 3 * SECPERYEAR + SECPERDAY;
/* Transform C divisions and modulos to mathematical ones */
y4 = (datetime->year - 1973) / 4;
if (datetime->year < 1973)
y4--;
y4 = ((datetime->year - 1) >> 2) - (1973 / 4);
ay = datetime->year - 1973 - 4 * y4;
ret += y4 * SECPER4YEARS;
ret += ay * SECPERYEAR;