[PATCH] locale.5: document glibc conventions regarding days and week

[Marko Myllynen <myllynen@redhat.com>]

Hi,

let's document glibc de facto current interpretation of handling weekdays also on the locale(5) man page, based on Petr's research in the past, currently documented in the glibc Locales wiki page.

>From fc28ef135148e0b6c6546666422cc9999e64bfc3 Mon Sep 17 00:00:00 2001
From: Marko Myllynen <myllynen@redhat.com>
Date: Mon, 26 May 2014 08:42:23 +0300
Subject: [PATCH] locale.5: document glibc conventions regarding days and week

Based on existing practice and glibc community wiki page at

https://sourceware.org/glibc/wiki/Locales
---
 man5/locale.5 |   69 +++++++++++++++++++++++++++++++++++++++++++-------------
 1 files changed, 53 insertions(+), 16 deletions(-)

diff --git a/man5/locale.5 b/man5/locale.5
index 2ad8e59..1b0f57d 100644
--- a/man5/locale.5
+++ b/man5/locale.5
@@ -966,14 +966,14 @@ followed by a list of abbreviated names of the days of the week.
 The list starts with the first day of the week
 as specified by
 .I week
-(Sunday by default).
+(Sunday by default). See NOTES.
 .TP
 .I day
 followed by a list of names of the days of the week.
 The list starts with the first day of the week
 as specified by
 .I week
-(Sunday by default).
+(Sunday by default). See NOTES.
 .TP
 .I abmon
 followed by a list of abbreviated month names.
@@ -1011,16 +1011,7 @@ Regarding the start of the week,
 shall be used for Sunday and
 .B 19971201
 shall be used for Monday.
-Thus, countries using
-.B 19971130
-should have local Sunday name as the first day in the
-.I day
-list,
-while countries using
-.B 19971201
-should have Monday translation as the first item in the
-.I day
-list.
+See NOTES.
 .TP
 .IR first_weekday " (since glibc 2.2)"
 followed by the number of the first day from the
@@ -1031,12 +1022,12 @@ The default value of
 corresponds to either Sunday or Monday depending
 on the value of the second
 .I week
-list item.
+list item. See NOTES.
 .TP
 .IR first_workday " (since glibc 2.2)"
 followed by the number of the first working day from the
 .I day
-list.
+list. See NOTES.
 .TP
 .I cal_direction
 .\" from localedata/locales/uk_UA
@@ -1067,10 +1058,56 @@ definition ends with the string
 \(em database for the current locale setting of that category
 .br
 /usr/lib/nls/charmap/* \(em charmap-files
+.SH NOTES
+The collective GNU C library community wisdom regarding
+.IR day ,
+.IR week ,
+and
+.I first_weekday
+states at
+https://sourceware.org/glibc/wiki/Locales
+the following:
+.PP
+The value of the second
+.I week
+list item specifies the base of the
+.I day
+list.
+.PP
+.I first_weekday
+specifies the offset of the first day-of-week in the
+.I day
+list.
+.PP
+For compatibility reasons, all glibc locales should set the value of the
+second
+.I week
+list item to
+.B 19971130
+(Sunday) and base the
+.I day
+list appropriately, and set
+.I first_weekday
+to
+.B 1
+or
+.BR 2 ,
+depending on whether the week actually starts on Sunday or Monday
+for the locale.
+.PP
+Thus, a locale which week starts on Monday
+.I first_weekday
+and
+.I first_workday
+should be set to
+.B 2
+and
+.I abday
+and
+.I day
+should have the locale representation of Sunday as the first list item.
 .SH CONFORMING TO
 POSIX.2, ISO/IEC 14652.
-.SH BUGS
-This manual page isn't complete.
 .\" .SH AUTHOR
 .\" Jochen Hein (Hein@Student.TU-Clausthal.de)
 .SH SEE ALSO
--
1.7.1

Thanks,

-- 
Marko Myllynen