Mail Archives: cygwin/2011/05/11/10:52:43
Hello!
The following STC hints at a problem in strptime:
-----------------------8<----------------------------
#include <stdio.h>
#include <time.h>
int
main(void)
{
/* seed tm with some garbage */
struct tm tm = {
0, 0, 0, /* s m h */
0, 0, 0, /* d m y */
290774, 2280577, 81
};
const char date[] = "2011-05-11 14:06:11";
if (!strptime(date, "%Y - %m - %d %T", &tm)) {
fprintf(stderr, "strptime error\n");
return 1;
}
printf("%s", asctime(&tm));
printf("tm_yday %d\n", tm.tm_yday);
printf("tm_wday %d\n", tm.tm_wday);
printf("tm_isdst %d\n", tm.tm_isdst);
return 0;
}
-----------------------8<----------------------------
I get this output with Cygwin 1.7.9-1:
May 11 14:06:11 2011
tm_yday 2280577
tm_wday 290774
tm_isdst 81
I expect:
Wed May 11 14:06:11 2011
tm_yday 130
tm_wday 3
tm_isdst whatever
I get the expected output on the Linux host I tried (with tm_isdst=81),
but not on Solaris 10.
On Solaris 10 I get (for completeness):
Sun May 11 14:06:11 2011
tm_yday 0
tm_wday 0
tm_isdst 0
Opengroup has this to say about only filling in some fields:
"It is unspecified whether multiple calls to strptime()
using the same tm structure will update the current
contents of the structure or overwrite all contents of
the structure. Conforming applications should make a
single call to strptime() with a format and all data
needed to completely specify the date and time being
converted."
but I don't think it applies since indeed I do completely specify
the date in my strptime call.
In my "real" program, the call to asctime with the crippled tm
causes a seg-fault instead of "just" missing weekday output, I guess
it depends...
Cheers,
Peter
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