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/*
* Time operation macros based on sys/time.h
* Copyright 2013 Balint Reczey <balint@balintreczey.hu>
*
* This file is part of libfaketime.
*
* libfaketime is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License v2 as published by the Free
* Software Foundation.
*
* libfaketime is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License v2 along
* with libfaketime; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef TIME_OPS_H
#define TIME_OPS_H
#include <time.h>
#define SEC_TO_uSEC 1000000
#define SEC_TO_nSEC 1000000000
/* Convenience macros for operations on timevals.
NOTE: `timercmp' does not work for >= or <=. */
#define timerisset2(tvp, prefix) ((tvp)->tv_sec || (tvp)->tv_##prefix##sec)
#define timerclear2(tvp, prefix) ((tvp)->tv_sec = (tvp)->tv_##prefix##sec = 0)
#define timercmp2(a, b, CMP, prefix) \
(((a)->tv_sec == (b)->tv_sec) ? \
((a)->tv_##prefix##sec CMP (b)->tv_##prefix##sec) : \
((a)->tv_sec CMP (b)->tv_sec))
#define timeradd2(a, b, result, prefix) \
do \
{ \
(result)->tv_sec = (a)->tv_sec + (b)->tv_sec; \
(result)->tv_##prefix##sec = (a)->tv_##prefix##sec + \
(b)->tv_##prefix##sec; \
if ((result)->tv_##prefix##sec >= SEC_TO_##prefix##SEC) \
{ \
++(result)->tv_sec; \
(result)->tv_##prefix##sec -= SEC_TO_##prefix##SEC; \
} \
} while (0)
#define timersub2(a, b, result, prefix) \
do \
{ \
(result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
(result)->tv_##prefix##sec = (a)->tv_##prefix##sec - \
(b)->tv_##prefix##sec; \
if ((result)->tv_##prefix##sec < 0) \
{ \
--(result)->tv_sec; \
(result)->tv_##prefix##sec += SEC_TO_##prefix##SEC; \
} \
} while (0)
#define timermul2(tvp, c, result, prefix) \
do \
{ \
long long tmp_time; \
tmp_time = (c) * ((tvp)->tv_sec * SEC_TO_##prefix##SEC + \
(tvp)->tv_##prefix##sec); \
(result)->tv_##prefix##sec = tmp_time % SEC_TO_##prefix##SEC; \
(result)->tv_sec = (tmp_time - (result)->tv_##prefix##sec) / \
SEC_TO_##prefix##SEC; \
if ((result)->tv_##prefix##sec < 0) \
{ \
(result)->tv_##prefix##sec += SEC_TO_##prefix##SEC; \
(result)->tv_sec -= 1; \
} \
} while (0)
/* ops for microsecs */
#ifndef timerisset
#define timerisset(tvp) timerisset2(tvp,u)
#endif
#ifndef timerclear
#define timerclear(tvp) timerclear2(tvp, u)
#endif
#ifndef timercmp
#define timercmp(a, b, CMP) timercmp2(a, b, CMP, u)
#endif
#ifndef timeradd
#define timeradd(a, b, result) timeradd2(a, b, result, u)
#endif
#ifndef timersub
#define timersub(a, b, result) timersub2(a, b, result, u)
#endif
#ifndef timersub
#define timermul(a, c, result) timermul2(a, c, result, u)
#endif
/* ops for nanosecs */
#define timespecisset(tvp) timerisset2(tvp,n)
#define timespecclear(tvp) timerclear2(tvp, n)
#define timespeccmp(a, b, CMP) timercmp2(a, b, CMP, n)
#define timespecadd(a, b, result) timeradd2(a, b, result, n)
#define timespecsub(a, b, result) timersub2(a, b, result, n)
#define timespecmul(a, c, result) timermul2(a, c, result, n)
#endif
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