Bug#327025: C locale has bad default for _NL_TIME_FIRST_WEEKDAY

[Graham Wilson <graham@mknod.org>]

Package: locales
Version: 2.3.5-6
Severity: normal

The _NL_TIME_FIRST_WEEKDAY symbol, when passed to nl_langinfo, is
supposed to give the first day of the week. This seems to work
correctly for most locales. However, the results for the POSIX locale
seem odd. I think it would make more sense for POSIX to default to
Sunday as the first day of the week, rather than Saturday.

 $ gcc -o test test.c
 $ ./test
 POSIX: Saturday
 en_US: Sunday
 en_GB: Sunday
 es_ES: Sunday
 nl_NL: Sunday
 fi_FI: Monday

I've attached the sample code that generates the above.

-- 
gram

#include <langinfo.h>
#include <locale.h>
#include <stdio.h>
#include <time.h>

void
foo(const char *s)
{
	struct tm tm;
	char buf[16];

	setlocale(LC_ALL, s);
	tm.tm_wday = *nl_langinfo(_NL_TIME_FIRST_WEEKDAY) - 1;

	setlocale(LC_ALL, "C");
	strftime(buf, sizeof(buf), "%A", &tm);
	printf("%s: %s\n", s, buf);
}

int
main(int argc, char *argv[])
{
	foo("POSIX");
	foo("en_US");
	foo("en_GB");
	foo("es_ES");
	foo("nl_NL");
	foo("fi_FI");
	return 0;
}