Today Alex van den Bogaerdt wrote: | | Hi, | | Can you please tell me if I'm on the right track here: | | The VDEF variables have both a value (rate) component and a | time component. Printing the rate is no problem, this is | already implemented and seems to work. Now for printing the | time component: | | 1) Which set of formatters can be used. Doing a man strftime on | a linux system shows that there may be some formatters that | are not available on each system. Is there a place where I can | find a "safe set" of them, is it better to program everything | myself (not a problem but seems to be re-inventing the wheel) or | should I just use strftime and let each user find out which one | can or cannot be used? I'm particullarry worried about the | availability of '%s' which I assume not to be so wide-spread as | other strings. | | 2) There is a little problem with %S (seconds) and %s (time since | the epoch) as they are also used by value printing. It seems to | me that it is easy to define some parsing rules. If the parser | fails to do it right, the PRINT can be separated into two different | ones and everything will be all right. | | a) If a value is printed and the next formatter string is %s or %S, | a SI unit is substituted | b) If no value is printed, it must mean time | c) If a value is printed but between this value and the %s there is | some other formatter, it means time. | | This means "%6.2lf %sbps" or "%6.2lf %Sbps will print 123.45 kbps, | and "%6.2lf %H:%S" will print 123.45 23:15 | If you really want "%6.2lf %s" to print 123.45 997382402, then | it should be programmed as two different (G)PRINTS. | what I would do, is use whatever strftime you get from the system how about this. You tell people that they have to use two %% for the lf part and one % for the strformat part ... this has the effect the first the time gets resolved which also turns %% into % and then you run it through printf which resolves the rest ...
eg "%%6.2lf %Y-%m-%d" writing your own implementation of strftime looks a bit like overkill ... cheers tobi | -- ______ __ _ /_ __/_ / / (_) Oetiker, ETZ J97, ETH, 8092 Zurich, Switzerland / // _ \/ _ \/ / phoneto:+41(0)1-632-5286 faxto:+41(0)1-632-1517 /_/ \.__/_.__/_/ mailto:[EMAIL PROTECTED] http://people.ee.ethz.ch/~oetiker -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/rrd-developers WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi
