The Tcpdump Group git mirrors - tcpdump/blob - timeval-operations.h

   1 /*
   2  * Copyright (c) 2015 The TCPDUMP project
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  15  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  16  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  17  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  18  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  20  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  22  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  24  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  25  * POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #ifndef netdissect_timeval_operations_h
  29 #define netdissect_timeval_operations_h
  30
  31 /* Operations on timevals. */
  32
  33 #define ND_MICRO_PER_SEC 1000000
  34 #define ND_NANO_PER_SEC 1000000000
  35
  36 #define netdissect_timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
  37
  38 #define netdissect_timevalisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
  39
  40 #define netdissect_timevalcmp(tvp, uvp, cmp)   \
  41         (((tvp)->tv_sec == (uvp)->tv_sec) ?    \
  42          ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
  43          ((tvp)->tv_sec cmp (uvp)->tv_sec))
  44
  45 #define netdissect_timevaladd(tvp, uvp, vvp, nano_prec)           \
  46         do {                                                      \
  47                 (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;    \
  48                 (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
  49                 if (nano_prec) {                                  \
  50                         if ((vvp)->tv_usec >= ND_NANO_PER_SEC) {  \
  51                                 (vvp)->tv_sec++;                  \
  52                                 (vvp)->tv_usec -= ND_NANO_PER_SEC; \
  53                         }                                         \
  54                 } else {                                          \
  55                         if ((vvp)->tv_usec >= ND_MICRO_PER_SEC) { \
  56                                 (vvp)->tv_sec++;                  \
  57                                 (vvp)->tv_usec -= ND_MICRO_PER_SEC; \
  58                         }                                         \
  59                 }                                                 \
  60         } while (0)
  61
  62 #define netdissect_timevalsub(tvp, uvp, vvp, nano_prec)            \
  63         do {                                                       \
  64                 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;     \
  65                 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;  \
  66                 if ((vvp)->tv_usec < 0) {                          \
  67                     (vvp)->tv_sec--;                               \
  68                     (vvp)->tv_usec += (nano_prec ? ND_NANO_PER_SEC : \
  69                                        ND_MICRO_PER_SEC);          \
  70                 }                                                  \
  71         } while (0)
  72
  73 #endif /* netdissect_timeval_operations_h */