[9fans] silly question
I want to process some dated logfiles in awk. gawk has date, strftime and mktime but Brian's does not. plan9 has date(1) but there is no tm2sec(1), unless it is called somthing I didn't expect. Anyone found somting I could not in the plan9 distribution? -Steve
Re: [9fans] silly question
gawk has date, strftime and mktime but Brian's does not.
I hacked a version of strftime() for my own use, I don't know if it
helps. It may not be the very latest version, I keep messing with it:
#include u.h
#include libc.h
static char *awday[7] = { Sun, Mon, Tue, Wed, Thu, Fri, Sat };
static char *wday[7] = { Sunday, Monday, Tuesday, Wednesday, Thursday,
Friday, Saturday};
static char *amon[12] = { Jan, Feb, Mar, Apr, May, Jun,
Jul, Aug, Sep, Oct, Nov, Dec };
static char *mon[12] = {January, February, March, April, May, June,
July, August, September, October, November,
December};
static char *ampm[2] = {AM, PM};
static char *tz[2] = {EST, EDT};
static int jan1(int);
static char *strval(char *, char *, char **, int, int);
static char *dval(char *, char *, int, int);
long
strftime (char *s, long maxsize, const char *format, const Tm *t)
{
char *sp, *se, *fp;
int i;
sp = s;
se = s+maxsize;
for(fp=(char *)format; *fp spse; fp++){
if(*fp != '%')
*sp++ = *fp;
else switch(*++fp){
case 'a':
sp = strval(sp, se, awday, t-wday, 7);
break;
case 'A':
sp = strval(sp, se, wday, t-wday, 7);
break;
case 'b':
sp = strval(sp, se, amon, t-mon, 12);
break;
case 'B':
sp = strval(sp, se, mon, t-mon, 12);
break;
case 'c':
sp += strftime(sp, se-sp, %a %b %d %H:%M:%S
%Y, t);
break;
case 'd':
sp = dval(sp, se, t-mday, 2);
break;
case 'H':
sp = dval(sp, se, t-hour, 2);
break;
case 'I':
i = t-hour;
if(i == 0)
i = 12;
else if(i 12)
i -= 12;
sp = dval(sp, se, i, 2);
break;
case 'j':
sp = dval(sp, se, t-yday+1, 3);
break;
case 'm':
sp = dval(sp, se, t-mon+1, 2);
break;
case 'M':
sp = dval(sp, se, t-min, 2);
break;
case 'p':
i = (t-hour 12)? 0 : 1;
sp = strval(sp, se, ampm, i, 2);
break;
case 'S':
sp = dval(sp, se, t-sec, 2);
break;
case 'U':
i = 7-jan1(t-year);
if(i == 7)
i = 0;
/* Now i is yday number of first sunday in year
*/
if(t-yday i)
i = 0;
else
i = (t-yday-i)/7 + 1;
sp = dval(sp, se, i, 2);
break;
case 'w':
sp = dval(sp, se, t-wday, 1);
break;
case 'W':
i = 8-jan1(t-year);
if(i = 7)
i -= 7;
/* Now i is yday number of first monday in year
*/
if(t-yday i)
i = 0;
else
i = (t-yday-i)/7 + 1;
sp = dval(sp, se, i, 2);
break;
case 'x':
sp += strftime(sp, se-sp, %a %b %d, %Y, t);
break;
case 'X':
sp += strftime(sp, se-sp, %H:%M:%S, t);
break;
case 'y':
sp = dval(sp, se, t-year%100, 2);
break;
case 'Y':
sp =
Re: [9fans] silly question
Steve Simon st...@quintile.net wrote: I want to process some dated logfiles in awk. gawk has date, strftime and mktime but Brian's does not. plan9 has date(1) but there is no tm2sec(1), unless it is called somthing I didn't expect. Anyone found somting I could not in the plan9 distribution? -Steve I'd be happy to know the results of attempting a gawk port via APE. :-) Thanks, Arnold
Re: [9fans] silly question
On Tuesday 02 September 2014 02:46:12 arn...@skeeve.com wrote: Steve Simon st...@quintile.net wrote: I want to process some dated logfiles in awk. gawk has date, strftime and mktime but Brian's does not. plan9 has date(1) but there is no tm2sec(1), unless it is called somthing I didn't expect. Anyone found somting I could not in the plan9 distribution? -Steve I'd be happy to know the results of attempting a gawk port via APE. :-) Thanks, Arnold There is one http://ports2plan9.googlecode.com/files/gawk-4.0.0b.pkg.tbz or /n/sources/contrib/staal1978/pkg/gawk-4.0.0b.pkg.tbz
Re: [9fans] silly question
I'd be happy to know the results of attempting a gawk port via APE. :-) There is one http://ports2plan9.googlecode.com/files/gawk-4.0.0b.pkg.tbz or /n/sources/contrib/staal1978/pkg/gawk-4.0.0b.pkg.tbz 4.0.0 is around 3 years old. Current version is 4.1.1. Although this one would do for Steve who wanted time functions. Thanks, Arnold
Re: [9fans] silly question
I'd be happy to know the results of attempting a gawk port via APE. :-) Not sure Al, Peter, or Brian would forgive me :-) Though if memory serves it has been done already. -Steve
Re: [9fans] silly question
i'm not sure what your particular problem domain is since you don't say True. Strftime is a red herring (sorry), I can use and date | getline to generate pretty much any date string I need. The issue is more going the other way. tm2sec in awk is quite complex and hids many pitfalls if you want to do it correctly. My problem is parsing logfiles which contain dates in the form of date(1) / ctime(2). I want to graph stuff over time and so I want a monotonically incrementing number (secs sinc 1/1/70 would be ideal). I have coded this in awk but for one year leap years break - though not by much. This is why I was asking if there was an external app called somthing like tm2sec which calls its eponomymous library function. it seems there isn't one and its the work of 30secs to write one, no problem, I just thought there was one but I had forgotten its name... -Steve
Re: [9fans] silly question
seconds(1) Marvelous, on two levels: that it exists and I can use it. that it diodn't imagine it Thanks Kurt. -Steve
Re: [9fans] silly question
On Tue, 02 Sep 2014 15:10:56 EDT erik quanstrom quans...@quanstro.net wrote: Strftime is a red herring (sorry), I can use and date | getline to generate pretty much any date string I need. The issue is more going the other way. tm2sec in awk is quite complex and hids many pitfalls if you want to do it correctly. My problem is parsing logfiles which contain dates in the form of date(1) / ctime(2). I want to graph stuff over time and so I want a monotonically incrementing number (secs sinc 1/1/70 would be ideal). I have coded this in awk but for one year leap years break - though not by much. if the hair is just leap years, the algorithm used by /sys/src/libc/9sys/ctim e.c is pretty attractive. the idea is to just loop through the years between giv en and 1970, and add a day for each leap year encountered. should be easy to do in awk. plan9 doesn't deal with leap seconds, right? There've been 35 leap seconds since 1972 (International Atomic Time is 35 seconds ahead of GMT). Though this probably doesn't matter for timestamps in log files.
Re: [9fans] silly question
inspired me to write discotime:
% cat discotime.go
// print the number of seconds from the dawn of Disco until the date
in the argument
package main
import (
fmt
os
time
)
func main() {
for _, s := range os.Args[1:] {
d, err := time.Parse(time.UnixDate, s)
if err != nil {
panic(err)
}
fmt.Println(d.Unix())
}
}
% ./discotime 'Tue Aug 16 17:03:52 CDT 1977'
240599032
to make a hammertime (http://en.wikipedia.org/wiki/U_Can't_Touch_This)
you can subtract 1990 from parsed date instead.
-Skip
On Tue, Sep 2, 2014 at 1:04 PM, Bakul Shah ba...@bitblocks.com wrote:
On Tue, 02 Sep 2014 15:10:56 EDT erik quanstrom quans...@quanstro.net wrote:
Strftime is a red herring (sorry), I can use and date | getline
to generate pretty much any date string I need.
The issue is more going the other way. tm2sec in awk is quite complex
and hids many pitfalls if you want to do it correctly.
My problem is parsing logfiles which contain dates in the form
of date(1) / ctime(2).
I want to graph stuff over time and so I want a monotonically incrementing
number (secs sinc 1/1/70 would be ideal). I have coded this in awk but
for one year leap years break - though not by much.
if the hair is just leap years, the algorithm used by /sys/src/libc/9sys/ctim
e.c
is pretty attractive. the idea is to just loop through the years between giv
en
and 1970, and add a day for each leap year encountered. should be easy
to do in awk.
plan9 doesn't deal with leap seconds, right? There've been 35
leap seconds since 1972 (International Atomic Time is 35
seconds ahead of GMT). Though this probably doesn't matter
for timestamps in log files.
Re: [9fans] silly question
to make a hammertime (http://en.wikipedia.org/wiki/U_Can't_Touch_This) you can subtract 1990 from parsed date instead. Oh no. Thats going to be stuck in my head for hours now ☺ -Steve
Re: [9fans] silly question
Skip, You have a very strange sense of humour.
At the first stroke it will be ten thrree 40 seconds.
At the first stroke it will be ten thrree 50 seconds.
At the first stroke it will be ten four. Precisely.
On Tue, 02 Sep 2014 14:10:57 PDT Skip Tavakkolian skip.tavakkol...@gmail.com
wrote:
inspired me to write discotime:
% cat discotime.go
// print the number of seconds from the dawn of Disco until the date
in the argument
package main
import (
fmt
os
time
)
func main() {
for _, s := range os.Args[1:] {
d, err := time.Parse(time.UnixDate, s)
if err != nil {
panic(err)
}
fmt.Println(d.Unix())
}
}
% ./discotime 'Tue Aug 16 17:03:52 CDT 1977'
240599032
to make a hammertime (http://en.wikipedia.org/wiki/U_Can't_Touch_This)
you can subtract 1990 from parsed date instead.
-Skip
On Tue, Sep 2, 2014 at 1:04 PM, Bakul Shah ba...@bitblocks.com wrote:
On Tue, 02 Sep 2014 15:10:56 EDT erik quanstrom quans...@quanstro.net wro
te:
Strftime is a red herring (sorry), I can use and date | getline
to generate pretty much any date string I need.
The issue is more going the other way. tm2sec in awk is quite complex
and hids many pitfalls if you want to do it correctly.
My problem is parsing logfiles which contain dates in the form
of date(1) / ctime(2).
I want to graph stuff over time and so I want a monotonically incrementi
ng
number (secs sinc 1/1/70 would be ideal). I have coded this in awk but
for one year leap years break - though not by much.
if the hair is just leap years, the algorithm used by /sys/src/libc/9sys/c
tim
e.c
is pretty attractive. the idea is to just loop through the years between
giv
en
and 1970, and add a day for each leap year encountered. should be easy
to do in awk.
plan9 doesn't deal with leap seconds, right? There've been 35
leap seconds since 1972 (International Atomic Time is 35
seconds ahead of GMT). Though this probably doesn't matter
for timestamps in log files.
Re: [9fans] silly question
correct. plan 9 does not bother with leap seconds. seconds(1) handles leap seconds in that it will not crash when it encounters them -- it accepts that sometimes there are 61 seconds in a minute. i'm not sure if we're talking past each other, or making different points. but either way, i should clarify. by not handling leap seconds i mean there is no code in ctime() to add in leap seconds from an external source at the appropriate unix times. so e.g. gmtime could read e.g. /lib/leapseconds and ajust seconds similar to days (/sys/src/libc/9sys/ctime.c:137,138). - erik
Re: [9fans] silly question
On Tue, 02 Sep 2014 19:00:56 EDT erik quanstrom quans...@quanstro.net wrote: correct. plan 9 does not bother with leap seconds. seconds(1) handles leap seconds in that it will not crash when it encounters them -- it accepts that sometimes there are 61 seconds in a minute. i'm not sure if we're talking past each other, or making different points. but either way, i should clarify. by not handling leap seconds i mean there is no code in ctime() to add in leap seconds from an external source at the appropriate unix times. so e.g. gmtime could read e.g. /lib/leapseconds and ajust seconds similar to days (/sys/src/libc/9sys/ctime.c:137,138). I was mistaken. Turns out neither do Unix systems handle leapseconds. Now if only ITU punts on leapseconds in 2015, we can let some future generation worry about leap minutes or hours! Sorry for the noise.
Re: [9fans] silly question
I was mistaken. Turns out neither do Unix systems handle leapseconds. Now if only ITU punts on leapseconds in 2015, we can let some future generation worry about leap minutes or hours! Sorry for the noise. or we can give up on noon being a particular solar time. this would free us from timezones, dst and other complications. just kidding ... maybe. - erik
Re: [9fans] silly question
The wikipedia entry on leap second is quite instructive. It is now. sl
[9fans] silly question - timezone
Hi, Where is /env timezone set from the contents of /adm/timezone/local? I have looked where I expect it it be (cpurc, termrc, profile) but cannot find it, I also grepped in the kernel source and found nothing. how does it happen? -Steve
Re: [9fans] silly question - timezone
Hi, Where is /env timezone set from the contents of /adm/timezone/local? ./cmd/init.c:58:cpenv(/adm/timezone/local, #e/timezone); - erik
