108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
/*
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* tod.c -- time of day pseudo-class implementation
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*
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* Copyright (c) 1995 John H. Poplett
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Absolutely no warranty of function or purpose is made by the author
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* John H. Poplett.
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* 4. This work was done expressly for inclusion into FreeBSD. Other use
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* is allowed if this notation is included.
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* 5. Modifications may be freely made to this file if the above conditions
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* are met.
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*
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <assert.h>
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#include <stdio.h>
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#include "tod.h"
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#define USP 1000000
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int tod_cmp (const struct timeval *a, const struct timeval *b)
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{
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int rc;
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assert (a->tv_usec <= USP);
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assert (b->tv_usec <= USP);
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rc = a->tv_sec - b->tv_sec;
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if (rc == 0)
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rc = a->tv_usec - b->tv_usec;
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return rc;
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}
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/*
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TOD < command
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*/
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int tod_lt (const struct timeval *a, const struct timeval *b)
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{
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return tod_cmp (a, b) < 0;
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}
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int tod_gt (const struct timeval *a, const struct timeval *b)
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{
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return tod_cmp (a, b) > 0;
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}
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int tod_lte (const struct timeval *a, const struct timeval *b)
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{
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return tod_cmp (a, b) <= 0;
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}
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int tod_gte (const struct timeval *a, const struct timeval *b)
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{
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return tod_cmp (a, b) >= 0;
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}
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int tod_eq (const struct timeval *a, const struct timeval *b)
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{
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return tod_cmp (a, b) == 0;
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}
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/*
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TOD += command
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*/
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void tod_addto (struct timeval *a, const struct timeval *b)
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{
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a->tv_usec += b->tv_usec;
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a->tv_sec += b->tv_sec + a->tv_usec / USP;
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a->tv_usec %= USP;
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}
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/*
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TOD -= command
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*/
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void tod_subfrom (struct timeval *a, struct timeval b)
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{
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assert (a->tv_usec <= USP);
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assert (b.tv_usec <= USP);
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if (b.tv_usec > a->tv_usec)
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{
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a->tv_usec += USP;
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a->tv_sec -= 1;
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}
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a->tv_usec -= b.tv_usec;
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a->tv_sec -= b.tv_sec;
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}
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void tod_gettime (struct timeval *tp)
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{
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gettimeofday (tp, NULL);
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tp->tv_sec += tp->tv_usec / USP;
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tp->tv_usec %= USP;
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}
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/* end of tod.c */
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