From owner-freebsd-hackers  Tue Oct 15 19:48:19 1996
Return-Path: owner-hackers
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.5/8.7.3) id TAA00728
          for hackers-outgoing; Tue, 15 Oct 1996 19:48:19 -0700 (PDT)
Received: from friley216.res.iastate.edu (friley216.res.iastate.edu [129.186.78.216])
          by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id TAA00714
          for <hackers@FreeBSD.org>; Tue, 15 Oct 1996 19:48:06 -0700 (PDT)
Received: from friley216.res.iastate.edu (loopback [127.0.0.1]) by friley216.res.iastate.edu (8.7.6/8.7.3) with ESMTP id VAA00535 for <hackers@FreeBSD.org>; Tue, 15 Oct 1996 21:47:55 -0500 (CDT)
Message-Id: <199610160247.VAA00535@friley216.res.iastate.edu>
To: hackers@FreeBSD.org
Subject: Proposed addition to sys/time.h..
Date: Tue, 15 Oct 1996 21:47:55 -0500
From: "Chris Csanady" <ccsanady@friley216.res.iastate.edu>
Sender: owner-hackers@FreeBSD.org
X-Loop: FreeBSD.org
Precedence: bulk


I was wondering if someone would like to add in the following macros from
NetBSD's sys/time.h.  They are really quite handy.

Anyway, I really hate sending this here, but what should I do with small
code change requests/etc?

Laters,
Chris Csanady

#define timeradd(tvp, uvp, vvp)                                         \
        do {                                                            \
                (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;          \
                (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;       \
                if ((vvp)->tv_usec >= 1000000) {                        \
                        (vvp)->tv_sec++;                                \
                        (vvp)->tv_usec -= 1000000;                      \
                }                                                       \
        } while (0)
#define timersub(tvp, uvp, vvp)                                         \
        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 += 1000000;                      \
                }                                                       \
        } while (0)