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From: Russ Allbery <rra@stanford.edu>
To: qmail@list.cr.yp.to
Subject: qmailanalog and current daemontools
Date: 01 Feb 2000 23:08:28 -0800

--=-=-=

qmailanalog wants seconds and fractional seconds (since start of epoch, I
suppose, although I don't think it actually matters since I believe all of
its calculations are relative).  Dan, were you planning on releasing a new
version of qmailanalog sometime at or after qmail 2.0?  Is the logging
format going to change sufficiently that I shouldn't put a lot of time
into approving log analysis for 1.03?

Attached is a small program based on tai64nlocal that will convert from
tai64n format to what qmailanalog expects.

-- 
Russ Allbery (rra@stanford.edu)         <URL:http://www.eyrie.org/~eagle/>



--=-=-=
Content-Disposition: inline; filename=tai64nfrac.c

/* $Id$

   Convert external TAI64N timestamps to fractional seconds since epoch.

   Written by Russ Allbery <rra@stanford.edu>
   This work is in the public domain.

   Usage:

        tai64nfrac < input > output

   Expects the input stream to be a sequence of lines beginning with @, a
   timestamp in external TAI64N format, and a space.  Replaces the @ and the
   timestamp with fractional seconds since epoch (1970-01-01 00:00:00 UTC).
   The input time format is the format written by tai64n and multilog.  The
   output time format is expected by qmailanalog. */

#include <stdio.h>

/* Read a TAI64N external format timestamp from stdin and write fractional
   seconds since epoch (TAI, not UTC) to stdout.  Return the character after
   the timestamp. */
int
decode(void)
{
    int c;
    unsigned long u;
    unsigned long seconds = 0;
    unsigned long nanoseconds = 0;

    while ((c = getchar()) != EOF) {
        u = c - '0';
        if (u >= 10) {
            u = c - 'a';
            if (u >= 6) break;
            u += 10;
        }
        seconds <<= 4;
        seconds += nanoseconds >> 28;
        nanoseconds &= 0xfffffff;
        nanoseconds <<= 4;
        nanoseconds += u;
    }
    seconds -= 4611686018427387914ULL;
    printf("%lu.%lu ", seconds, nanoseconds);
    return c;
}


int
main(void)
{
    int c;
    unsigned long seconds;
    unsigned long nanoseconds;

    while ((c = getchar()) != EOF) {
        if (c == '@') c = decode();
        while (c != EOF) {
            putchar(c);
            if (c == '\n') break;
            c = getchar();
        }
    }
}

--=-=-=--