usr.bin/tip/tod.c

   1 /*
   2  * tod.c -- time of day pseudo-class implementation
   3  *
   4  * Copyright (c) 1995 John H. Poplett
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice immediately at the beginning of the file, without modification,
  12  *    this list of conditions, and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Absolutely no warranty of function or purpose is made by the author
  17  *    John H. Poplett.
  18  * 4. This work was done expressly for inclusion into FreeBSD.  Other use
  19  *    is allowed if this notation is included.
  20  * 5. Modifications may be freely made to this file if the above conditions
  21  *    are met.
  22  *
  23  */
  24
  25 #include <sys/types.h>
  26 #include <sys/time.h>
  27
  28 #include <assert.h>
  29 #include <stdio.h>
  30
  31 #include "tod.h"
  32
  33 #define USP 1000000
  34
  35 int tod_cmp (const struct timeval *a, const struct timeval *b)
  36 {
  37         int rc;
  38         assert (a->tv_usec <= USP);
  39         assert (b->tv_usec <= USP);
  40         rc = a->tv_sec - b->tv_sec;
  41         if (rc == 0)
  42                 rc = a->tv_usec - b->tv_usec;
  43         return rc;
  44 }
  45
  46 /*
  47         TOD < command
  48 */
  49 int tod_lt (const struct timeval *a, const struct timeval *b)
  50 {
  51         return tod_cmp (a, b) < 0;
  52 }
  53
  54 int tod_gt (const struct timeval *a, const struct timeval *b)
  55 {
  56         return tod_cmp (a, b) > 0;
  57 }
  58
  59 int tod_lte (const struct timeval *a, const struct timeval *b)
  60 {
  61         return tod_cmp (a, b) <= 0;
  62 }
  63
  64 int tod_gte (const struct timeval *a, const struct timeval *b)
  65 {
  66         return tod_cmp (a, b) >= 0;
  67 }
  68
  69 int tod_eq (const struct timeval *a, const struct timeval *b)
  70 {
  71         return tod_cmp (a, b) == 0;
  72 }
  73
  74 /*
  75         TOD += command
  76 */
  77 void tod_addto (struct timeval *a, const struct timeval *b)
  78 {
  79         a->tv_usec += b->tv_usec;
  80         a->tv_sec += b->tv_sec + a->tv_usec / USP;
  81         a->tv_usec %= USP;
  82 }
  83
  84 /*
  85         TOD -= command
  86 */
  87 void tod_subfrom (struct timeval *a, struct timeval b)
  88 {
  89         assert (a->tv_usec <= USP);
  90         assert (b.tv_usec <= USP);
  91         if (b.tv_usec > a->tv_usec)
  92         {
  93                 a->tv_usec += USP;
  94                 a->tv_sec -= 1;
  95         }
  96         a->tv_usec -= b.tv_usec;
  97         a->tv_sec -= b.tv_sec;
  98 }
  99
 100 void tod_gettime (struct timeval *tp)
 101 {
 102         gettimeofday (tp, NULL);
 103         tp->tv_sec += tp->tv_usec / USP;
 104         tp->tv_usec %= USP;
 105 }
 106
 107 /* end of tod.c */