lib/53101: 6.1.5 nl_langinfo() swaps abbreviated vs full names in many locales

[khw%cpan.org@localhost]

>Number:         53101
>Category:       lib
>Synopsis:       6.1.5 nl_langinfo() swaps abbreviated vs full names in many locales
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Mar 15 17:40:01 +0000 2018
>Originator:     Karl Williamson
>Release:        6.1.5
>Organization:
perl 5 porters
>Environment:
NetBSD cjg-netbsd6 6.1.5 NetBSD 6.1.5 (GENERIC) amd64
>Description:
Many locales have the full and abbreviated weekday and month names swapped.  so that asking for the abbreviated name yields the full name, and vice versa.  This happens in the C locale.  It does not happen in the POSIX locale.  I thought those two locales were supposed to be equivalent, which appears to be a second bug.

This is not an issue as far as we've seen in 7.1.1.  I did not see a fix in a search through the changes.  But, 6.1.5 is supposedly still supported.
>How-To-Repeat:
There's no way to attach a file, so I'm inlining this C program.  If called with a locale name, it uses that; otherwise it uses the C locale, and that fails

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

int
main(int argc, char **argv)
{
    setlocale(LC_ALL, "C");

    if (argc > 1) {
        fprintf(stderr, "setlocale(LC_ALL, \"%s\")=%s\n", argv[1], setlocale(LC_ALL, argv[1]));
    }

    fprintf(stderr, "abbr\t full\n");
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABDAY_1), nl_langinfo(DAY_1));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABDAY_2), nl_langinfo(DAY_2));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABDAY_3), nl_langinfo(DAY_3));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABDAY_4), nl_langinfo(DAY_4));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABDAY_5), nl_langinfo(DAY_5));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABDAY_6), nl_langinfo(DAY_6));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABDAY_7), nl_langinfo(DAY_7));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABMON_1), nl_langinfo(MON_1));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABMON_2), nl_langinfo(MON_2));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABMON_3), nl_langinfo(MON_3));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABMON_4), nl_langinfo(MON_4));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABMON_5), nl_langinfo(MON_5));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABMON_6), nl_langinfo(MON_6));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABMON_7), nl_langinfo(MON_7));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABMON_8), nl_langinfo(MON_8));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABMON_9), nl_langinfo(MON_9));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABMON_10), nl_langinfo(MON_10));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABMON_11), nl_langinfo(MON_11));
    fprintf(stderr, "%s\t%s\n", nl_langinfo(ABMON_12), nl_langinfo(MON_12));
}

>Fix: