mdw@git.distorted.org.uk Git - disorder/blob - lib/timeval.h

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2007 Richard Kettlewell
   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, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * 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 Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20
  21 #ifndef TIMEVAL_H
  22 #define TIMEVAL_H
  23
  24 static inline struct timeval tvsub(const struct timeval a,
  25                                    const struct timeval b) {
  26   struct timeval r;
  27
  28   r.tv_sec = a.tv_sec - b.tv_sec;
  29   r.tv_usec = a.tv_usec - b.tv_usec;
  30   if(r.tv_usec < 0) {
  31     r.tv_usec += 1000000;
  32     r.tv_sec--;
  33   }
  34   if(r.tv_usec > 999999) {
  35     r.tv_usec -= 1000000;
  36     r.tv_sec++;
  37   }
  38   return r;
  39 }
  40
  41 #endif /* TIMEVAL_H */
  42
  43 /*
  44 Local Variables:
  45 c-basic-offset:2
  46 comment-column:40
  47 fill-column:79
  48 indent-tabs-mode:nil
  49 End:
  50 */