Re: octave 2.9.13 on cygwin

[Marco Atzeri]

--- "John W. Eaton" ha scritto:

> On 30-Aug-2007, Marco Atzeri wrote:
> 
> | Hi,
> | first I would like to confirm that 
> | octave-2.9.13 compile fine on latest 
> | cygwin snapshot 1.7.0s(0.177/4/2) 20070813
> 12:16:31.
> | Can anyone confirm it for others cygwin ?
> | 
> | [tm,nc]=strptime('30-Aug-2007','%d-%b-%Y')
> | tm =
> | {
> |   usec = 0
> |   sec = 0
> |   min = 0
> |   hour = 0
> |   mday =  30
> |   mon =  7
> |   year =  107
> |   wday = 0
> |   yday = 0
> |   isdst = 0
> |   zone = WEST
> | }
> | 
> | nc =  12
> | 
> | It seems a old issue not solved yet
> |
> 
> Can you please debug why it fails to compute the
> correct number of
> characters on your system?
> 
> jwe
> 
I suspect there is a problem in the cygwin 
implementation of strptime.

I built a test program around 
http://www.opengroup.org/onlinepubs/009695399/functions/strptime.html
example

strptime_test.c
-----------------------------------
#include <time.h>
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char **argv)
{

struct tm tm;
time_t t;
char *strp_time;

if (argc != 3) 
    {/* Handle error */;
        printf("usage:   %s  date 
date_format",argv[0]);
        exit(EXIT_FAILURE);
    }

if ((strp_time=strptime(argv[1], argv[2], &tm)) ==
NULL)
    {/* Handle error */;
        printf("ERROR: strptime NULL \n");
    }

printf("year: %d; month: %d; day: %d;\n",
        tm.tm_year, tm.tm_mon, tm.tm_mday);
printf("hour: %d; minute: %d; second: %d\n",
        tm.tm_hour, tm.tm_min, tm.tm_sec);
printf("week day: %d; year day: %d\n", tm.tm_wday,
tm.tm_yday);

printf("strptime len: %d\n",(strp_time-argv[1])) ; 

tm.tm_isdst = -1;      /* Not set by strptime(); tells
mktime()
                          to determine whether
daylight saving time
                          is in effect */
t = mktime(&tm);
if (t == -1)
    {/* Handle error */;
        printf("ERROR:  mktime \n ");
     }

printf("seconds since the Epoch: %ld\n", (long) t);
}
-------------------------------------

gcc -o strptime_test strptime_test.c

$ ./strptime_test.exe '30-Aug-2007' '%d-%b-%Y'
year: 107; month: 7; day: 30;
hour: 2280452; minute: 60450; second: 0
week day: 2280680; year day: 1628394983
strptime len: 11
ERROR:  mktime 
 seconds since the Epoch: -1


from  the specification of 

"RETURN VALUE

    Upon successful completion, strptime() shall 
return a pointer to the character following the 
last character parsed. Otherwise, a null pointer 
shall be returned."

It is not clear if "\n" character is to be included 
or not in the parsing.

However
week day: 2280680; year day: 1628394983

are probably the cause of failing test in octave

./strptime_test.exe "6 Dec 2007 12:33:45" "%d %b %Y
%H:%M:%S"
year: 107; month: 11; day: 6;
hour: 12; minute: 33; second: 45
week day: 2280680; year day: 1628394983
strptime len: 19
seconds since the Epoch: 1196940825





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