- prepare OpenOCD for branching, created ./trunk/
[fw/openocd] / 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 #include "config.h"
21
22 #include "time_support.h"
23
24 #include <sys/time.h>
25 #include <time.h>
26
27 int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y);
28 int timeval_add(struct timeval *result, struct timeval *x, struct timeval *y);
29 int timeval_add_time(struct timeval *result, int sec, int usec);
30
31 /* calculate difference between two struct timeval values */
32 int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y)
33 {
34         if (x->tv_usec < y->tv_usec)
35         {
36                 int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
37                 y->tv_usec -= 1000000 * nsec;
38                 y->tv_sec += nsec;
39         }
40         if (x->tv_usec - y->tv_usec > 1000000) {
41                 int nsec = (x->tv_usec - y->tv_usec) / 1000000;
42                 y->tv_usec += 1000000 * nsec;
43                 y->tv_sec -= nsec;
44         }
45
46         result->tv_sec = x->tv_sec - y->tv_sec;
47         result->tv_usec = x->tv_usec - y->tv_usec;
48
49         /* Return 1 if result is negative. */
50         return x->tv_sec < y->tv_sec;
51 }
52
53 /* add two struct timeval values */
54 int timeval_add(struct timeval *result, struct timeval *x, struct timeval *y)
55 {
56         result->tv_sec = x->tv_sec + y->tv_sec;
57         
58         result->tv_usec = x->tv_usec + y->tv_usec;
59         
60         while (result->tv_usec > 1000000)
61         {
62                 result->tv_usec -= 1000000;
63                 result->tv_sec++;
64         }
65         
66         return 0;
67 }
68
69 int timeval_add_time(struct timeval *result, int sec, int usec)
70 {
71         result->tv_sec += sec;
72         result->tv_usec += usec;
73         
74         while (result->tv_usec > 1000000)
75         {
76                 result->tv_usec -= 1000000;
77                 result->tv_sec++;
78         }
79         
80         return 0;
81 }
82