3 * $Id: tv.c,v 1.3 1999/05/06 19:51:36 mdw Exp $
5 * Manipulation of timeval structures
7 * (c) 1998 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the mLib utilities library.
14 * mLib is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
19 * mLib is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with mLib; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.3 1999/05/06 19:51:36 mdw
34 * Reformatted the LGPL notice a little bit.
36 * Revision 1.2 1999/05/05 18:50:31 mdw
37 * Change licensing conditions to LGPL.
39 * Revision 1.1 1998/11/25 23:30:01 mdw
44 /*----- Header files ------------------------------------------------------*/
49 /*----- Main code ---------------------------------------------------------*/
53 * Arguments: @struct timeval *dst@ = destination block
54 * @const struct timeval *a, *b@ = source blocks
58 * Use: Adds two timevals.
61 void tv_add(struct timeval *dst,
62 const struct timeval *a, const struct timeval *b)
64 dst->tv_sec = a->tv_sec + b->tv_sec;
65 dst->tv_usec = a->tv_usec + b->tv_usec;
66 if (dst->tv_usec >= 1000000) {
67 dst->tv_usec -= 1000000;
74 * Arguments: @struct timeval *dst@ = destination block
75 * @const struct timeval *a, *b@ = source blocks
79 * Use: Subtracts two timevals.
82 void tv_sub(struct timeval *dst,
83 const struct timeval *a, const struct timeval *b)
85 dst->tv_sec = a->tv_sec - b->tv_sec;
86 if (a->tv_usec >= b->tv_usec)
87 dst->tv_usec = a->tv_usec - b->tv_usec;
89 dst->tv_usec = a->tv_usec + 1000000 - b->tv_usec;
96 * Arguments: @const struct timeval *a, *b@ = source blocks
98 * Returns: Less than, equal to, or greater than zero.
100 * Use: Compares two timevals.
103 int tv_cmp(const struct timeval *a, const struct timeval *b)
105 if (a->tv_sec > b->tv_sec)
107 else if (a->tv_sec < b->tv_sec)
109 else if (a->tv_usec > b->tv_usec)
111 else if (a->tv_usec < b->tv_usec)
117 /*----- That's all, folks -------------------------------------------------*/