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      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 #define ND_INVALID_MICRO_SEC_STR "(invalid us)"
     36 #define ND_INVALID_NANO_SEC_STR "(invalid ns)"
     37 
     38 #define netdissect_timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
     39 
     40 #define netdissect_timevalisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
     41 
     42 #define netdissect_timevalcmp(tvp, uvp, cmp)   \
     43 	(((tvp)->tv_sec == (uvp)->tv_sec) ?    \
     44 	 ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
     45 	 ((tvp)->tv_sec cmp (uvp)->tv_sec))
     46 
     47 #define netdissect_timevaladd(tvp, uvp, vvp, nano_prec)           \
     48 	do {                                                      \
     49 		(vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;    \
     50 		(vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
     51 		if (nano_prec) {                                  \
     52 			if ((vvp)->tv_usec >= ND_NANO_PER_SEC) {  \
     53 				(vvp)->tv_sec++;                  \
     54 				(vvp)->tv_usec -= ND_NANO_PER_SEC; \
     55 			}                                         \
     56 		} else {                                          \
     57 			if ((vvp)->tv_usec >= ND_MICRO_PER_SEC) { \
     58 				(vvp)->tv_sec++;                  \
     59 				(vvp)->tv_usec -= ND_MICRO_PER_SEC; \
     60 			}                                         \
     61 		}                                                 \
     62 	} while (0)
     63 
     64 #define netdissect_timevalsub(tvp, uvp, vvp, nano_prec)            \
     65 	do {                                                       \
     66 		(vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;     \
     67 		(vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;  \
     68 		if ((vvp)->tv_usec < 0) {                          \
     69 		    (vvp)->tv_sec--;                               \
     70 		    (vvp)->tv_usec += (nano_prec ? ND_NANO_PER_SEC : \
     71 				       ND_MICRO_PER_SEC);          \
     72 		}                                                  \
     73 	} while (0)
     74 
     75 #endif /* netdissect_timeval_operations_h */
     76