src/helper/time_support.c

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "time_support.h"
  25 #include "log.h"
  26
  27 #include <stdlib.h>
  28 #include <sys/time.h>
  29 #include <time.h>
  30
  31 int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y);
  32 int timeval_add(struct timeval *result, struct timeval *x, struct timeval *y);
  33 int timeval_add_time(struct timeval *result, int sec, int usec);
  34
  35 /* calculate difference between two struct timeval values */
  36 int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y)
  37 {
  38         if (x->tv_usec < y->tv_usec)
  39         {
  40                 int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
  41                 y->tv_usec -= 1000000 * nsec;
  42                 y->tv_sec += nsec;
  43         }
  44         if (x->tv_usec - y->tv_usec > 1000000) {
  45                 int nsec = (x->tv_usec - y->tv_usec) / 1000000;
  46                 y->tv_usec += 1000000 * nsec;
  47                 y->tv_sec -= nsec;
  48         }
  49
  50         result->tv_sec = x->tv_sec - y->tv_sec;
  51         result->tv_usec = x->tv_usec - y->tv_usec;
  52
  53         /* Return 1 if result is negative. */
  54         return x->tv_sec < y->tv_sec;
  55 }
  56
  57 /* add two struct timeval values */
  58 int timeval_add(struct timeval *result, struct timeval *x, struct timeval *y)
  59 {
  60         result->tv_sec = x->tv_sec + y->tv_sec;
  61
  62         result->tv_usec = x->tv_usec + y->tv_usec;
  63
  64         while (result->tv_usec > 1000000)
  65         {
  66                 result->tv_usec -= 1000000;
  67                 result->tv_sec++;
  68         }
  69
  70         return 0;
  71 }
  72
  73 int timeval_add_time(struct timeval *result, int sec, int usec)
  74 {
  75         result->tv_sec += sec;
  76         result->tv_usec += usec;
  77
  78         while (result->tv_usec > 1000000)
  79         {
  80                 result->tv_usec -= 1000000;
  81                 result->tv_sec++;
  82         }
  83
  84         return 0;
  85 }
  86
  87 int duration_start_measure(duration_t *duration)
  88 {
  89         gettimeofday(&duration->start, NULL);
  90
  91         return ERROR_OK;
  92 }
  93
  94 int duration_stop_measure(duration_t *duration, char **text)
  95 {
  96         struct timeval end;
  97
  98         gettimeofday(&end, NULL);
  99
 100         timeval_subtract(&duration->duration, &end, &duration->start);
 101
 102         if (text)
 103         {
 104                 *text = malloc(16);
 105                 snprintf(*text, 16, "%lis %lius", duration->duration.tv_sec, duration->duration.tv_usec);
 106         }
 107
 108         return ERROR_OK;
 109 }