GRASS Programmer's Manual
6.4.3(2013)-r
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sign.c
Go to the documentation of this file.
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/*
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* Copyright (C) 1995. Bill Brown <brown@gis.uiuc.edu> & Michael Shapiro
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*
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* This program is free software under the GPL (>=v2)
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* Read the file GPL.TXT coming with GRASS for details.
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*/
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#include <grass/datetime.h>
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int
datetime_is_positive
(
const
DateTime * dt)
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{
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return
dt->positive != 0;
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}
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int
datetime_is_negative
(
const
DateTime * dt)
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{
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return
dt->positive == 0;
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}
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void
datetime_set_positive
(DateTime * dt)
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{
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dt->positive = 1;
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}
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void
datetime_set_negative
(DateTime * dt)
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{
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dt->positive = 0;
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}
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void
datetime_invert_sign
(DateTime * dt)
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{
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dt->positive = !dt->positive;
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}
lib
datetime
sign.c
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