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Date:      Wed, 25 Jun 1997 20:31:06 +1000
From:      Giles Lean <giles@nemeton.com.au>
To:        Michael Smith <msmith@atrad.adelaide.edu.au>
Cc:        joerg_wunsch@uriah.heep.sax.de, hackers@freebsd.org
Subject:   Re: libedit, etc. (CVS issues) 
Message-ID:  <4856.867234666@nemeton.com.au>
In-Reply-To: <199706250820.RAA00477@genesis.atrad.adelaide.edu.au>
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On Wed, 25 Jun 1997 17:50:47 +0930 (CST)  Michael Smith wrote:

> Does anyone know what the NetBSD function "timersub()" is supposed to do?

You can find it in src/sys/sys/time.h.  The following excerpt
is from a NetBSD-current tree.

#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)

Regards,

Giles

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