/*
* Copyright (c) 2015 The TCPDUMP project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef netdissect_timeval_operations_h
#define netdissect_timeval_operations_h

/* Operations on timevals. */

#define ND_MICRO_PER_SEC 1000000
#define ND_NANO_PER_SEC 1000000000

#define netdissect_timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)

#define netdissect_timevalisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)

#define netdissect_timevalcmp(tvp, uvp, cmp)   \
       (((tvp)->tv_sec == (uvp)->tv_sec) ?    \
        ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
        ((tvp)->tv_sec cmp (uvp)->tv_sec))

#define netdissect_timevaladd(tvp, uvp, vvp, nano_prec)           \
       do {                                                      \
               (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;    \
               (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
               if (nano_prec) {                                  \
                       if ((vvp)->tv_usec >= ND_NANO_PER_SEC) {  \
                               (vvp)->tv_sec++;                  \
                               (vvp)->tv_usec -= ND_NANO_PER_SEC; \
                       }                                         \
               } else {                                          \
                       if ((vvp)->tv_usec >= ND_MICRO_PER_SEC) { \
                               (vvp)->tv_sec++;                  \
                               (vvp)->tv_usec -= ND_MICRO_PER_SEC; \
                       }                                         \
               }                                                 \
       } while (0)

#define netdissect_timevalsub(tvp, uvp, vvp, nano_prec)            \
       do {                                                       \
               (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;     \
               (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;  \
               if ((vvp)->tv_usec < 0) {                          \
                   (vvp)->tv_sec--;                               \
                   (vvp)->tv_usec += (nano_prec ? ND_NANO_PER_SEC : \
                                      ND_MICRO_PER_SEC);          \
               }                                                  \
       } while (0)

#endif /* netdissect_timeval_operations_h */

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